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Linux/drivers/scsi/megaraid/megaraid_mbox.c

  1 /*
  2  *
  3  *                      Linux MegaRAID device driver
  4  *
  5  * Copyright (c) 2003-2004  LSI Logic Corporation.
  6  *
  7  *         This program is free software; you can redistribute it and/or
  8  *         modify it under the terms of the GNU General Public License
  9  *         as published by the Free Software Foundation; either version
 10  *         2 of the License, or (at your option) any later version.
 11  *
 12  * FILE         : megaraid_mbox.c
 13  * Version      : v2.20.5.1 (Nov 16 2006)
 14  *
 15  * Authors:
 16  *      Atul Mukker             <Atul.Mukker@lsi.com>
 17  *      Sreenivas Bagalkote     <Sreenivas.Bagalkote@lsi.com>
 18  *      Manoj Jose              <Manoj.Jose@lsi.com>
 19  *      Seokmann Ju
 20  *
 21  * List of supported controllers
 22  *
 23  * OEM  Product Name                    VID     DID     SSVID   SSID
 24  * ---  ------------                    ---     ---     ----    ----
 25  * Dell PERC3/QC                        101E    1960    1028    0471
 26  * Dell PERC3/DC                        101E    1960    1028    0493
 27  * Dell PERC3/SC                        101E    1960    1028    0475
 28  * Dell PERC3/Di                        1028    1960    1028    0123
 29  * Dell PERC4/SC                        1000    1960    1028    0520
 30  * Dell PERC4/DC                        1000    1960    1028    0518
 31  * Dell PERC4/QC                        1000    0407    1028    0531
 32  * Dell PERC4/Di                        1028    000F    1028    014A
 33  * Dell PERC 4e/Si                      1028    0013    1028    016c
 34  * Dell PERC 4e/Di                      1028    0013    1028    016d
 35  * Dell PERC 4e/Di                      1028    0013    1028    016e
 36  * Dell PERC 4e/Di                      1028    0013    1028    016f
 37  * Dell PERC 4e/Di                      1028    0013    1028    0170
 38  * Dell PERC 4e/DC                      1000    0408    1028    0002
 39  * Dell PERC 4e/SC                      1000    0408    1028    0001
 40  *
 41  *
 42  * LSI MegaRAID SCSI 320-0              1000    1960    1000    A520
 43  * LSI MegaRAID SCSI 320-1              1000    1960    1000    0520
 44  * LSI MegaRAID SCSI 320-2              1000    1960    1000    0518
 45  * LSI MegaRAID SCSI 320-0X             1000    0407    1000    0530
 46  * LSI MegaRAID SCSI 320-2X             1000    0407    1000    0532
 47  * LSI MegaRAID SCSI 320-4X             1000    0407    1000    0531
 48  * LSI MegaRAID SCSI 320-1E             1000    0408    1000    0001
 49  * LSI MegaRAID SCSI 320-2E             1000    0408    1000    0002
 50  * LSI MegaRAID SATA 150-4              1000    1960    1000    4523
 51  * LSI MegaRAID SATA 150-6              1000    1960    1000    0523
 52  * LSI MegaRAID SATA 300-4X             1000    0409    1000    3004
 53  * LSI MegaRAID SATA 300-8X             1000    0409    1000    3008
 54  *
 55  * INTEL RAID Controller SRCU42X        1000    0407    8086    0532
 56  * INTEL RAID Controller SRCS16         1000    1960    8086    0523
 57  * INTEL RAID Controller SRCU42E        1000    0408    8086    0002
 58  * INTEL RAID Controller SRCZCRX        1000    0407    8086    0530
 59  * INTEL RAID Controller SRCS28X        1000    0409    8086    3008
 60  * INTEL RAID Controller SROMBU42E      1000    0408    8086    3431
 61  * INTEL RAID Controller SROMBU42E      1000    0408    8086    3499
 62  * INTEL RAID Controller SRCU51L        1000    1960    8086    0520
 63  *
 64  * FSC  MegaRAID PCI Express ROMB       1000    0408    1734    1065
 65  *
 66  * ACER MegaRAID ROMB-2E                1000    0408    1025    004D
 67  *
 68  * NEC  MegaRAID PCI Express ROMB       1000    0408    1033    8287
 69  *
 70  * For history of changes, see Documentation/scsi/ChangeLog.megaraid
 71  */
 72 
 73 #include <linux/slab.h>
 74 #include <linux/module.h>
 75 #include "megaraid_mbox.h"
 76 
 77 static int megaraid_init(void);
 78 static void megaraid_exit(void);
 79 
 80 static int megaraid_probe_one(struct pci_dev*, const struct pci_device_id *);
 81 static void megaraid_detach_one(struct pci_dev *);
 82 static void megaraid_mbox_shutdown(struct pci_dev *);
 83 
 84 static int megaraid_io_attach(adapter_t *);
 85 static void megaraid_io_detach(adapter_t *);
 86 
 87 static int megaraid_init_mbox(adapter_t *);
 88 static void megaraid_fini_mbox(adapter_t *);
 89 
 90 static int megaraid_alloc_cmd_packets(adapter_t *);
 91 static void megaraid_free_cmd_packets(adapter_t *);
 92 
 93 static int megaraid_mbox_setup_dma_pools(adapter_t *);
 94 static void megaraid_mbox_teardown_dma_pools(adapter_t *);
 95 
 96 static int megaraid_sysfs_alloc_resources(adapter_t *);
 97 static void megaraid_sysfs_free_resources(adapter_t *);
 98 
 99 static int megaraid_abort_handler(struct scsi_cmnd *);
100 static int megaraid_reset_handler(struct scsi_cmnd *);
101 
102 static int mbox_post_sync_cmd(adapter_t *, uint8_t []);
103 static int mbox_post_sync_cmd_fast(adapter_t *, uint8_t []);
104 static int megaraid_busywait_mbox(mraid_device_t *);
105 static int megaraid_mbox_product_info(adapter_t *);
106 static int megaraid_mbox_extended_cdb(adapter_t *);
107 static int megaraid_mbox_support_ha(adapter_t *, uint16_t *);
108 static int megaraid_mbox_support_random_del(adapter_t *);
109 static int megaraid_mbox_get_max_sg(adapter_t *);
110 static void megaraid_mbox_enum_raid_scsi(adapter_t *);
111 static void megaraid_mbox_flush_cache(adapter_t *);
112 static int megaraid_mbox_fire_sync_cmd(adapter_t *);
113 
114 static void megaraid_mbox_display_scb(adapter_t *, scb_t *);
115 static void megaraid_mbox_setup_device_map(adapter_t *);
116 
117 static int megaraid_queue_command(struct Scsi_Host *, struct scsi_cmnd *);
118 static scb_t *megaraid_mbox_build_cmd(adapter_t *, struct scsi_cmnd *, int *);
119 static void megaraid_mbox_runpendq(adapter_t *, scb_t *);
120 static void megaraid_mbox_prepare_pthru(adapter_t *, scb_t *,
121                 struct scsi_cmnd *);
122 static void megaraid_mbox_prepare_epthru(adapter_t *, scb_t *,
123                 struct scsi_cmnd *);
124 
125 static irqreturn_t megaraid_isr(int, void *);
126 
127 static void megaraid_mbox_dpc(unsigned long);
128 
129 static ssize_t megaraid_sysfs_show_app_hndl(struct device *, struct device_attribute *attr, char *);
130 static ssize_t megaraid_sysfs_show_ldnum(struct device *, struct device_attribute *attr, char *);
131 
132 static int megaraid_cmm_register(adapter_t *);
133 static int megaraid_cmm_unregister(adapter_t *);
134 static int megaraid_mbox_mm_handler(unsigned long, uioc_t *, uint32_t);
135 static int megaraid_mbox_mm_command(adapter_t *, uioc_t *);
136 static void megaraid_mbox_mm_done(adapter_t *, scb_t *);
137 static int gather_hbainfo(adapter_t *, mraid_hba_info_t *);
138 static int wait_till_fw_empty(adapter_t *);
139 
140 
141 
142 MODULE_AUTHOR("megaraidlinux@lsi.com");
143 MODULE_DESCRIPTION("LSI Logic MegaRAID Mailbox Driver");
144 MODULE_LICENSE("GPL");
145 MODULE_VERSION(MEGARAID_VERSION);
146 
147 /*
148  * ### modules parameters for driver ###
149  */
150 
151 /*
152  * Set to enable driver to expose unconfigured disk to kernel
153  */
154 static int megaraid_expose_unconf_disks = 0;
155 module_param_named(unconf_disks, megaraid_expose_unconf_disks, int, 0);
156 MODULE_PARM_DESC(unconf_disks,
157         "Set to expose unconfigured disks to kernel (default=0)");
158 
159 /*
160  * driver wait time if the adapter's mailbox is busy
161  */
162 static unsigned int max_mbox_busy_wait = MBOX_BUSY_WAIT;
163 module_param_named(busy_wait, max_mbox_busy_wait, int, 0);
164 MODULE_PARM_DESC(busy_wait,
165         "Max wait for mailbox in microseconds if busy (default=10)");
166 
167 /*
168  * number of sectors per IO command
169  */
170 static unsigned int megaraid_max_sectors = MBOX_MAX_SECTORS;
171 module_param_named(max_sectors, megaraid_max_sectors, int, 0);
172 MODULE_PARM_DESC(max_sectors,
173         "Maximum number of sectors per IO command (default=128)");
174 
175 /*
176  * number of commands per logical unit
177  */
178 static unsigned int megaraid_cmd_per_lun = MBOX_DEF_CMD_PER_LUN;
179 module_param_named(cmd_per_lun, megaraid_cmd_per_lun, int, 0);
180 MODULE_PARM_DESC(cmd_per_lun,
181         "Maximum number of commands per logical unit (default=64)");
182 
183 
184 /*
185  * Fast driver load option, skip scanning for physical devices during load.
186  * This would result in non-disk devices being skipped during driver load
187  * time. These can be later added though, using /proc/scsi/scsi
188  */
189 static unsigned int megaraid_fast_load = 0;
190 module_param_named(fast_load, megaraid_fast_load, int, 0);
191 MODULE_PARM_DESC(fast_load,
192         "Faster loading of the driver, skips physical devices! (default=0)");
193 
194 
195 /*
196  * mraid_debug level - threshold for amount of information to be displayed by
197  * the driver. This level can be changed through modules parameters, ioctl or
198  * sysfs/proc interface. By default, print the announcement messages only.
199  */
200 int mraid_debug_level = CL_ANN;
201 module_param_named(debug_level, mraid_debug_level, int, 0);
202 MODULE_PARM_DESC(debug_level, "Debug level for driver (default=0)");
203 
204 /*
205  * ### global data ###
206  */
207 static uint8_t megaraid_mbox_version[8] =
208         { 0x02, 0x20, 0x04, 0x06, 3, 7, 20, 5 };
209 
210 
211 /*
212  * PCI table for all supported controllers.
213  */
214 static struct pci_device_id pci_id_table_g[] =  {
215         {
216                 PCI_VENDOR_ID_DELL,
217                 PCI_DEVICE_ID_PERC4_DI_DISCOVERY,
218                 PCI_VENDOR_ID_DELL,
219                 PCI_SUBSYS_ID_PERC4_DI_DISCOVERY,
220         },
221         {
222                 PCI_VENDOR_ID_LSI_LOGIC,
223                 PCI_DEVICE_ID_PERC4_SC,
224                 PCI_VENDOR_ID_DELL,
225                 PCI_SUBSYS_ID_PERC4_SC,
226         },
227         {
228                 PCI_VENDOR_ID_LSI_LOGIC,
229                 PCI_DEVICE_ID_PERC4_DC,
230                 PCI_VENDOR_ID_DELL,
231                 PCI_SUBSYS_ID_PERC4_DC,
232         },
233         {
234                 PCI_VENDOR_ID_LSI_LOGIC,
235                 PCI_DEVICE_ID_VERDE,
236                 PCI_ANY_ID,
237                 PCI_ANY_ID,
238         },
239         {
240                 PCI_VENDOR_ID_DELL,
241                 PCI_DEVICE_ID_PERC4_DI_EVERGLADES,
242                 PCI_VENDOR_ID_DELL,
243                 PCI_SUBSYS_ID_PERC4_DI_EVERGLADES,
244         },
245         {
246                 PCI_VENDOR_ID_DELL,
247                 PCI_DEVICE_ID_PERC4E_SI_BIGBEND,
248                 PCI_VENDOR_ID_DELL,
249                 PCI_SUBSYS_ID_PERC4E_SI_BIGBEND,
250         },
251         {
252                 PCI_VENDOR_ID_DELL,
253                 PCI_DEVICE_ID_PERC4E_DI_KOBUK,
254                 PCI_VENDOR_ID_DELL,
255                 PCI_SUBSYS_ID_PERC4E_DI_KOBUK,
256         },
257         {
258                 PCI_VENDOR_ID_DELL,
259                 PCI_DEVICE_ID_PERC4E_DI_CORVETTE,
260                 PCI_VENDOR_ID_DELL,
261                 PCI_SUBSYS_ID_PERC4E_DI_CORVETTE,
262         },
263         {
264                 PCI_VENDOR_ID_DELL,
265                 PCI_DEVICE_ID_PERC4E_DI_EXPEDITION,
266                 PCI_VENDOR_ID_DELL,
267                 PCI_SUBSYS_ID_PERC4E_DI_EXPEDITION,
268         },
269         {
270                 PCI_VENDOR_ID_DELL,
271                 PCI_DEVICE_ID_PERC4E_DI_GUADALUPE,
272                 PCI_VENDOR_ID_DELL,
273                 PCI_SUBSYS_ID_PERC4E_DI_GUADALUPE,
274         },
275         {
276                 PCI_VENDOR_ID_LSI_LOGIC,
277                 PCI_DEVICE_ID_DOBSON,
278                 PCI_ANY_ID,
279                 PCI_ANY_ID,
280         },
281         {
282                 PCI_VENDOR_ID_AMI,
283                 PCI_DEVICE_ID_AMI_MEGARAID3,
284                 PCI_ANY_ID,
285                 PCI_ANY_ID,
286         },
287         {
288                 PCI_VENDOR_ID_LSI_LOGIC,
289                 PCI_DEVICE_ID_AMI_MEGARAID3,
290                 PCI_ANY_ID,
291                 PCI_ANY_ID,
292         },
293         {
294                 PCI_VENDOR_ID_LSI_LOGIC,
295                 PCI_DEVICE_ID_LINDSAY,
296                 PCI_ANY_ID,
297                 PCI_ANY_ID,
298         },
299         {0}     /* Terminating entry */
300 };
301 MODULE_DEVICE_TABLE(pci, pci_id_table_g);
302 
303 
304 static struct pci_driver megaraid_pci_driver = {
305         .name           = "megaraid",
306         .id_table       = pci_id_table_g,
307         .probe          = megaraid_probe_one,
308         .remove         = megaraid_detach_one,
309         .shutdown       = megaraid_mbox_shutdown,
310 };
311 
312 
313 
314 // definitions for the device attributes for exporting logical drive number
315 // for a scsi address (Host, Channel, Id, Lun)
316 
317 DEVICE_ATTR(megaraid_mbox_app_hndl, S_IRUSR, megaraid_sysfs_show_app_hndl,
318                 NULL);
319 
320 // Host template initializer for megaraid mbox sysfs device attributes
321 static struct device_attribute *megaraid_shost_attrs[] = {
322         &dev_attr_megaraid_mbox_app_hndl,
323         NULL,
324 };
325 
326 
327 DEVICE_ATTR(megaraid_mbox_ld, S_IRUSR, megaraid_sysfs_show_ldnum, NULL);
328 
329 // Host template initializer for megaraid mbox sysfs device attributes
330 static struct device_attribute *megaraid_sdev_attrs[] = {
331         &dev_attr_megaraid_mbox_ld,
332         NULL,
333 };
334 
335 /**
336  * megaraid_change_queue_depth - Change the device's queue depth
337  * @sdev:       scsi device struct
338  * @qdepth:     depth to set
339  * @reason:     calling context
340  *
341  * Return value:
342  *      actual depth set
343  */
344 static int megaraid_change_queue_depth(struct scsi_device *sdev, int qdepth,
345                                        int reason)
346 {
347         if (reason != SCSI_QDEPTH_DEFAULT)
348                 return -EOPNOTSUPP;
349 
350         if (qdepth > MBOX_MAX_SCSI_CMDS)
351                 qdepth = MBOX_MAX_SCSI_CMDS;
352         scsi_adjust_queue_depth(sdev, 0, qdepth);
353         return sdev->queue_depth;
354 }
355 
356 /*
357  * Scsi host template for megaraid unified driver
358  */
359 static struct scsi_host_template megaraid_template_g = {
360         .module                         = THIS_MODULE,
361         .name                           = "LSI Logic MegaRAID driver",
362         .proc_name                      = "megaraid",
363         .queuecommand                   = megaraid_queue_command,
364         .eh_abort_handler               = megaraid_abort_handler,
365         .eh_device_reset_handler        = megaraid_reset_handler,
366         .eh_bus_reset_handler           = megaraid_reset_handler,
367         .eh_host_reset_handler          = megaraid_reset_handler,
368         .change_queue_depth             = megaraid_change_queue_depth,
369         .use_clustering                 = ENABLE_CLUSTERING,
370         .no_write_same                  = 1,
371         .sdev_attrs                     = megaraid_sdev_attrs,
372         .shost_attrs                    = megaraid_shost_attrs,
373 };
374 
375 
376 /**
377  * megaraid_init - module load hook
378  *
379  * We register ourselves as hotplug enabled module and let PCI subsystem
380  * discover our adapters.
381  */
382 static int __init
383 megaraid_init(void)
384 {
385         int     rval;
386 
387         // Announce the driver version
388         con_log(CL_ANN, (KERN_INFO "megaraid: %s %s\n", MEGARAID_VERSION,
389                 MEGARAID_EXT_VERSION));
390 
391         // check validity of module parameters
392         if (megaraid_cmd_per_lun > MBOX_MAX_SCSI_CMDS) {
393 
394                 con_log(CL_ANN, (KERN_WARNING
395                         "megaraid mailbox: max commands per lun reset to %d\n",
396                         MBOX_MAX_SCSI_CMDS));
397 
398                 megaraid_cmd_per_lun = MBOX_MAX_SCSI_CMDS;
399         }
400 
401 
402         // register as a PCI hot-plug driver module
403         rval = pci_register_driver(&megaraid_pci_driver);
404         if (rval < 0) {
405                 con_log(CL_ANN, (KERN_WARNING
406                         "megaraid: could not register hotplug support.\n"));
407         }
408 
409         return rval;
410 }
411 
412 
413 /**
414  * megaraid_exit - driver unload entry point
415  *
416  * We simply unwrap the megaraid_init routine here.
417  */
418 static void __exit
419 megaraid_exit(void)
420 {
421         con_log(CL_DLEVEL1, (KERN_NOTICE "megaraid: unloading framework\n"));
422 
423         // unregister as PCI hotplug driver
424         pci_unregister_driver(&megaraid_pci_driver);
425 
426         return;
427 }
428 
429 
430 /**
431  * megaraid_probe_one - PCI hotplug entry point
432  * @pdev        : handle to this controller's PCI configuration space
433  * @id          : pci device id of the class of controllers
434  *
435  * This routine should be called whenever a new adapter is detected by the
436  * PCI hotplug susbsystem.
437  */
438 static int
439 megaraid_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
440 {
441         adapter_t       *adapter;
442 
443 
444         // detected a new controller
445         con_log(CL_ANN, (KERN_INFO
446                 "megaraid: probe new device %#4.04x:%#4.04x:%#4.04x:%#4.04x: ",
447                 pdev->vendor, pdev->device, pdev->subsystem_vendor,
448                 pdev->subsystem_device));
449 
450         con_log(CL_ANN, ("bus %d:slot %d:func %d\n", pdev->bus->number,
451                 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn)));
452 
453         if (pci_enable_device(pdev)) {
454                 con_log(CL_ANN, (KERN_WARNING
455                                 "megaraid: pci_enable_device failed\n"));
456 
457                 return -ENODEV;
458         }
459 
460         // Enable bus-mastering on this controller
461         pci_set_master(pdev);
462 
463         // Allocate the per driver initialization structure
464         adapter = kzalloc(sizeof(adapter_t), GFP_KERNEL);
465 
466         if (adapter == NULL) {
467                 con_log(CL_ANN, (KERN_WARNING
468                 "megaraid: out of memory, %s %d.\n", __func__, __LINE__));
469 
470                 goto out_probe_one;
471         }
472 
473 
474         // set up PCI related soft state and other pre-known parameters
475         adapter->unique_id      = pdev->bus->number << 8 | pdev->devfn;
476         adapter->irq            = pdev->irq;
477         adapter->pdev           = pdev;
478 
479         atomic_set(&adapter->being_detached, 0);
480 
481         // Setup the default DMA mask. This would be changed later on
482         // depending on hardware capabilities
483         if (pci_set_dma_mask(adapter->pdev, DMA_BIT_MASK(32)) != 0) {
484 
485                 con_log(CL_ANN, (KERN_WARNING
486                         "megaraid: pci_set_dma_mask failed:%d\n", __LINE__));
487 
488                 goto out_free_adapter;
489         }
490 
491 
492         // Initialize the synchronization lock for kernel and LLD
493         spin_lock_init(&adapter->lock);
494 
495         // Initialize the command queues: the list of free SCBs and the list
496         // of pending SCBs.
497         INIT_LIST_HEAD(&adapter->kscb_pool);
498         spin_lock_init(SCSI_FREE_LIST_LOCK(adapter));
499 
500         INIT_LIST_HEAD(&adapter->pend_list);
501         spin_lock_init(PENDING_LIST_LOCK(adapter));
502 
503         INIT_LIST_HEAD(&adapter->completed_list);
504         spin_lock_init(COMPLETED_LIST_LOCK(adapter));
505 
506 
507         // Start the mailbox based controller
508         if (megaraid_init_mbox(adapter) != 0) {
509                 con_log(CL_ANN, (KERN_WARNING
510                         "megaraid: maibox adapter did not initialize\n"));
511 
512                 goto out_free_adapter;
513         }
514 
515         // Register with LSI Common Management Module
516         if (megaraid_cmm_register(adapter) != 0) {
517 
518                 con_log(CL_ANN, (KERN_WARNING
519                 "megaraid: could not register with management module\n"));
520 
521                 goto out_fini_mbox;
522         }
523 
524         // setup adapter handle in PCI soft state
525         pci_set_drvdata(pdev, adapter);
526 
527         // attach with scsi mid-layer
528         if (megaraid_io_attach(adapter) != 0) {
529 
530                 con_log(CL_ANN, (KERN_WARNING "megaraid: io attach failed\n"));
531 
532                 goto out_cmm_unreg;
533         }
534 
535         return 0;
536 
537 out_cmm_unreg:
538         megaraid_cmm_unregister(adapter);
539 out_fini_mbox:
540         megaraid_fini_mbox(adapter);
541 out_free_adapter:
542         kfree(adapter);
543 out_probe_one:
544         pci_disable_device(pdev);
545 
546         return -ENODEV;
547 }
548 
549 
550 /**
551  * megaraid_detach_one - release framework resources and call LLD release routine
552  * @pdev        : handle for our PCI configuration space
553  *
554  * This routine is called during driver unload. We free all the allocated
555  * resources and call the corresponding LLD so that it can also release all
556  * its resources.
557  *
558  * This routine is also called from the PCI hotplug system.
559  */
560 static void
561 megaraid_detach_one(struct pci_dev *pdev)
562 {
563         adapter_t               *adapter;
564         struct Scsi_Host        *host;
565 
566 
567         // Start a rollback on this adapter
568         adapter = pci_get_drvdata(pdev);
569 
570         if (!adapter) {
571                 con_log(CL_ANN, (KERN_CRIT
572                 "megaraid: Invalid detach on %#4.04x:%#4.04x:%#4.04x:%#4.04x\n",
573                         pdev->vendor, pdev->device, pdev->subsystem_vendor,
574                         pdev->subsystem_device));
575 
576                 return;
577         }
578         else {
579                 con_log(CL_ANN, (KERN_NOTICE
580                 "megaraid: detaching device %#4.04x:%#4.04x:%#4.04x:%#4.04x\n",
581                         pdev->vendor, pdev->device, pdev->subsystem_vendor,
582                         pdev->subsystem_device));
583         }
584 
585 
586         host = adapter->host;
587 
588         // do not allow any more requests from the management module for this
589         // adapter.
590         // FIXME: How do we account for the request which might still be
591         // pending with us?
592         atomic_set(&adapter->being_detached, 1);
593 
594         // detach from the IO sub-system
595         megaraid_io_detach(adapter);
596 
597         // Unregister from common management module
598         //
599         // FIXME: this must return success or failure for conditions if there
600         // is a command pending with LLD or not.
601         megaraid_cmm_unregister(adapter);
602 
603         // finalize the mailbox based controller and release all resources
604         megaraid_fini_mbox(adapter);
605 
606         kfree(adapter);
607 
608         scsi_host_put(host);
609 
610         pci_disable_device(pdev);
611 
612         return;
613 }
614 
615 
616 /**
617  * megaraid_mbox_shutdown - PCI shutdown for megaraid HBA
618  * @pdev                : generic driver model device
619  *
620  * Shutdown notification, perform flush cache.
621  */
622 static void
623 megaraid_mbox_shutdown(struct pci_dev *pdev)
624 {
625         adapter_t               *adapter = pci_get_drvdata(pdev);
626         static int              counter;
627 
628         if (!adapter) {
629                 con_log(CL_ANN, (KERN_WARNING
630                         "megaraid: null device in shutdown\n"));
631                 return;
632         }
633 
634         // flush caches now
635         con_log(CL_ANN, (KERN_INFO "megaraid: flushing adapter %d...",
636                 counter++));
637 
638         megaraid_mbox_flush_cache(adapter);
639 
640         con_log(CL_ANN, ("done\n"));
641 }
642 
643 
644 /**
645  * megaraid_io_attach - attach a device with the IO subsystem
646  * @adapter             : controller's soft state
647  *
648  * Attach this device with the IO subsystem.
649  */
650 static int
651 megaraid_io_attach(adapter_t *adapter)
652 {
653         struct Scsi_Host        *host;
654 
655         // Initialize SCSI Host structure
656         host = scsi_host_alloc(&megaraid_template_g, 8);
657         if (!host) {
658                 con_log(CL_ANN, (KERN_WARNING
659                         "megaraid mbox: scsi_register failed\n"));
660 
661                 return -1;
662         }
663 
664         SCSIHOST2ADAP(host)     = (caddr_t)adapter;
665         adapter->host           = host;
666 
667         host->irq               = adapter->irq;
668         host->unique_id         = adapter->unique_id;
669         host->can_queue         = adapter->max_cmds;
670         host->this_id           = adapter->init_id;
671         host->sg_tablesize      = adapter->sglen;
672         host->max_sectors       = adapter->max_sectors;
673         host->cmd_per_lun       = adapter->cmd_per_lun;
674         host->max_channel       = adapter->max_channel;
675         host->max_id            = adapter->max_target;
676         host->max_lun           = adapter->max_lun;
677 
678 
679         // notify mid-layer about the new controller
680         if (scsi_add_host(host, &adapter->pdev->dev)) {
681 
682                 con_log(CL_ANN, (KERN_WARNING
683                         "megaraid mbox: scsi_add_host failed\n"));
684 
685                 scsi_host_put(host);
686 
687                 return -1;
688         }
689 
690         scsi_scan_host(host);
691 
692         return 0;
693 }
694 
695 
696 /**
697  * megaraid_io_detach - detach a device from the IO subsystem
698  * @adapter             : controller's soft state
699  *
700  * Detach this device from the IO subsystem.
701  */
702 static void
703 megaraid_io_detach(adapter_t *adapter)
704 {
705         struct Scsi_Host        *host;
706 
707         con_log(CL_DLEVEL1, (KERN_INFO "megaraid: io detach\n"));
708 
709         host = adapter->host;
710 
711         scsi_remove_host(host);
712 
713         return;
714 }
715 
716 
717 /*
718  * START: Mailbox Low Level Driver
719  *
720  * This is section specific to the single mailbox based controllers
721  */
722 
723 /**
724  * megaraid_init_mbox - initialize controller
725  * @adapter             : our soft state
726  *
727  * - Allocate 16-byte aligned mailbox memory for firmware handshake
728  * - Allocate controller's memory resources
729  * - Find out all initialization data
730  * - Allocate memory required for all the commands
731  * - Use internal library of FW routines, build up complete soft state
732  */
733 static int
734 megaraid_init_mbox(adapter_t *adapter)
735 {
736         struct pci_dev          *pdev;
737         mraid_device_t          *raid_dev;
738         int                     i;
739         uint32_t                magic64;
740 
741 
742         adapter->ito    = MBOX_TIMEOUT;
743         pdev            = adapter->pdev;
744 
745         /*
746          * Allocate and initialize the init data structure for mailbox
747          * controllers
748          */
749         raid_dev = kzalloc(sizeof(mraid_device_t), GFP_KERNEL);
750         if (raid_dev == NULL) return -1;
751 
752 
753         /*
754          * Attach the adapter soft state to raid device soft state
755          */
756         adapter->raid_device    = (caddr_t)raid_dev;
757         raid_dev->fast_load     = megaraid_fast_load;
758 
759 
760         // our baseport
761         raid_dev->baseport = pci_resource_start(pdev, 0);
762 
763         if (pci_request_regions(pdev, "MegaRAID: LSI Logic Corporation") != 0) {
764 
765                 con_log(CL_ANN, (KERN_WARNING
766                                 "megaraid: mem region busy\n"));
767 
768                 goto out_free_raid_dev;
769         }
770 
771         raid_dev->baseaddr = ioremap_nocache(raid_dev->baseport, 128);
772 
773         if (!raid_dev->baseaddr) {
774 
775                 con_log(CL_ANN, (KERN_WARNING
776                         "megaraid: could not map hba memory\n") );
777 
778                 goto out_release_regions;
779         }
780 
781         /* initialize the mutual exclusion lock for the mailbox */
782         spin_lock_init(&raid_dev->mailbox_lock);
783 
784         /* allocate memory required for commands */
785         if (megaraid_alloc_cmd_packets(adapter) != 0)
786                 goto out_iounmap;
787 
788         /*
789          * Issue SYNC cmd to flush the pending cmds in the adapter
790          * and initialize its internal state
791          */
792 
793         if (megaraid_mbox_fire_sync_cmd(adapter))
794                 con_log(CL_ANN, ("megaraid: sync cmd failed\n"));
795 
796         /*
797          * Setup the rest of the soft state using the library of
798          * FW routines
799          */
800 
801         /* request IRQ and register the interrupt service routine */
802         if (request_irq(adapter->irq, megaraid_isr, IRQF_SHARED, "megaraid",
803                 adapter)) {
804 
805                 con_log(CL_ANN, (KERN_WARNING
806                         "megaraid: Couldn't register IRQ %d!\n", adapter->irq));
807                 goto out_alloc_cmds;
808 
809         }
810 
811         // Product info
812         if (megaraid_mbox_product_info(adapter) != 0)
813                 goto out_free_irq;
814 
815         // Do we support extended CDBs
816         adapter->max_cdb_sz = 10;
817         if (megaraid_mbox_extended_cdb(adapter) == 0) {
818                 adapter->max_cdb_sz = 16;
819         }
820 
821         /*
822          * Do we support cluster environment, if we do, what is the initiator
823          * id.
824          * NOTE: In a non-cluster aware firmware environment, the LLD should
825          * return 7 as initiator id.
826          */
827         adapter->ha             = 0;
828         adapter->init_id        = -1;
829         if (megaraid_mbox_support_ha(adapter, &adapter->init_id) == 0) {
830                 adapter->ha = 1;
831         }
832 
833         /*
834          * Prepare the device ids array to have the mapping between the kernel
835          * device address and megaraid device address.
836          * We export the physical devices on their actual addresses. The
837          * logical drives are exported on a virtual SCSI channel
838          */
839         megaraid_mbox_setup_device_map(adapter);
840 
841         // If the firmware supports random deletion, update the device id map
842         if (megaraid_mbox_support_random_del(adapter)) {
843 
844                 // Change the logical drives numbers in device_ids array one
845                 // slot in device_ids is reserved for target id, that's why
846                 // "<=" below
847                 for (i = 0; i <= MAX_LOGICAL_DRIVES_40LD; i++) {
848                         adapter->device_ids[adapter->max_channel][i] += 0x80;
849                 }
850                 adapter->device_ids[adapter->max_channel][adapter->init_id] =
851                         0xFF;
852 
853                 raid_dev->random_del_supported = 1;
854         }
855 
856         /*
857          * find out the maximum number of scatter-gather elements supported by
858          * this firmware
859          */
860         adapter->sglen = megaraid_mbox_get_max_sg(adapter);
861 
862         // enumerate RAID and SCSI channels so that all devices on SCSI
863         // channels can later be exported, including disk devices
864         megaraid_mbox_enum_raid_scsi(adapter);
865 
866         /*
867          * Other parameters required by upper layer
868          *
869          * maximum number of sectors per IO command
870          */
871         adapter->max_sectors = megaraid_max_sectors;
872 
873         /*
874          * number of queued commands per LUN.
875          */
876         adapter->cmd_per_lun = megaraid_cmd_per_lun;
877 
878         /*
879          * Allocate resources required to issue FW calls, when sysfs is
880          * accessed
881          */
882         if (megaraid_sysfs_alloc_resources(adapter) != 0)
883                 goto out_free_irq;
884 
885         // Set the DMA mask to 64-bit. All supported controllers as capable of
886         // DMA in this range
887         pci_read_config_dword(adapter->pdev, PCI_CONF_AMISIG64, &magic64);
888 
889         if (((magic64 == HBA_SIGNATURE_64_BIT) &&
890                 ((adapter->pdev->subsystem_device !=
891                 PCI_SUBSYS_ID_MEGARAID_SATA_150_6) &&
892                 (adapter->pdev->subsystem_device !=
893                 PCI_SUBSYS_ID_MEGARAID_SATA_150_4))) ||
894                 (adapter->pdev->vendor == PCI_VENDOR_ID_LSI_LOGIC &&
895                 adapter->pdev->device == PCI_DEVICE_ID_VERDE) ||
896                 (adapter->pdev->vendor == PCI_VENDOR_ID_LSI_LOGIC &&
897                 adapter->pdev->device == PCI_DEVICE_ID_DOBSON) ||
898                 (adapter->pdev->vendor == PCI_VENDOR_ID_LSI_LOGIC &&
899                 adapter->pdev->device == PCI_DEVICE_ID_LINDSAY) ||
900                 (adapter->pdev->vendor == PCI_VENDOR_ID_DELL &&
901                 adapter->pdev->device == PCI_DEVICE_ID_PERC4_DI_EVERGLADES) ||
902                 (adapter->pdev->vendor == PCI_VENDOR_ID_DELL &&
903                 adapter->pdev->device == PCI_DEVICE_ID_PERC4E_DI_KOBUK)) {
904                 if (pci_set_dma_mask(adapter->pdev, DMA_BIT_MASK(64))) {
905                         con_log(CL_ANN, (KERN_WARNING
906                                 "megaraid: DMA mask for 64-bit failed\n"));
907 
908                         if (pci_set_dma_mask (adapter->pdev, DMA_BIT_MASK(32))) {
909                                 con_log(CL_ANN, (KERN_WARNING
910                                         "megaraid: 32-bit DMA mask failed\n"));
911                                 goto out_free_sysfs_res;
912                         }
913                 }
914         }
915 
916         // setup tasklet for DPC
917         tasklet_init(&adapter->dpc_h, megaraid_mbox_dpc,
918                         (unsigned long)adapter);
919 
920         con_log(CL_DLEVEL1, (KERN_INFO
921                 "megaraid mbox hba successfully initialized\n"));
922 
923         return 0;
924 
925 out_free_sysfs_res:
926         megaraid_sysfs_free_resources(adapter);
927 out_free_irq:
928         free_irq(adapter->irq, adapter);
929 out_alloc_cmds:
930         megaraid_free_cmd_packets(adapter);
931 out_iounmap:
932         iounmap(raid_dev->baseaddr);
933 out_release_regions:
934         pci_release_regions(pdev);
935 out_free_raid_dev:
936         kfree(raid_dev);
937 
938         return -1;
939 }
940 
941 
942 /**
943  * megaraid_fini_mbox - undo controller initialization
944  * @adapter             : our soft state
945  */
946 static void
947 megaraid_fini_mbox(adapter_t *adapter)
948 {
949         mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
950 
951         // flush all caches
952         megaraid_mbox_flush_cache(adapter);
953 
954         tasklet_kill(&adapter->dpc_h);
955 
956         megaraid_sysfs_free_resources(adapter);
957 
958         megaraid_free_cmd_packets(adapter);
959 
960         free_irq(adapter->irq, adapter);
961 
962         iounmap(raid_dev->baseaddr);
963 
964         pci_release_regions(adapter->pdev);
965 
966         kfree(raid_dev);
967 
968         return;
969 }
970 
971 
972 /**
973  * megaraid_alloc_cmd_packets - allocate shared mailbox
974  * @adapter             : soft state of the raid controller
975  *
976  * Allocate and align the shared mailbox. This maibox is used to issue
977  * all the commands. For IO based controllers, the mailbox is also registered
978  * with the FW. Allocate memory for all commands as well.
979  * This is our big allocator.
980  */
981 static int
982 megaraid_alloc_cmd_packets(adapter_t *adapter)
983 {
984         mraid_device_t          *raid_dev = ADAP2RAIDDEV(adapter);
985         struct pci_dev          *pdev;
986         unsigned long           align;
987         scb_t                   *scb;
988         mbox_ccb_t              *ccb;
989         struct mraid_pci_blk    *epthru_pci_blk;
990         struct mraid_pci_blk    *sg_pci_blk;
991         struct mraid_pci_blk    *mbox_pci_blk;
992         int                     i;
993 
994         pdev = adapter->pdev;
995 
996         /*
997          * Setup the mailbox
998          * Allocate the common 16-byte aligned memory for the handshake
999          * mailbox.
1000          */
1001         raid_dev->una_mbox64 = pci_zalloc_consistent(adapter->pdev,
1002                                                      sizeof(mbox64_t),
1003                                                      &raid_dev->una_mbox64_dma);
1004 
1005         if (!raid_dev->una_mbox64) {
1006                 con_log(CL_ANN, (KERN_WARNING
1007                         "megaraid: out of memory, %s %d\n", __func__,
1008                         __LINE__));
1009                 return -1;
1010         }
1011 
1012         /*
1013          * Align the mailbox at 16-byte boundary
1014          */
1015         raid_dev->mbox  = &raid_dev->una_mbox64->mbox32;
1016 
1017         raid_dev->mbox  = (mbox_t *)((((unsigned long)raid_dev->mbox) + 15) &
1018                                 (~0UL ^ 0xFUL));
1019 
1020         raid_dev->mbox64 = (mbox64_t *)(((unsigned long)raid_dev->mbox) - 8);
1021 
1022         align = ((void *)raid_dev->mbox -
1023                         ((void *)&raid_dev->una_mbox64->mbox32));
1024 
1025         raid_dev->mbox_dma = (unsigned long)raid_dev->una_mbox64_dma + 8 +
1026                         align;
1027 
1028         // Allocate memory for commands issued internally
1029         adapter->ibuf = pci_zalloc_consistent(pdev, MBOX_IBUF_SIZE,
1030                                               &adapter->ibuf_dma_h);
1031         if (!adapter->ibuf) {
1032 
1033                 con_log(CL_ANN, (KERN_WARNING
1034                         "megaraid: out of memory, %s %d\n", __func__,
1035                         __LINE__));
1036 
1037                 goto out_free_common_mbox;
1038         }
1039 
1040         // Allocate memory for our SCSI Command Blocks and their associated
1041         // memory
1042 
1043         /*
1044          * Allocate memory for the base list of scb. Later allocate memory for
1045          * CCBs and embedded components of each CCB and point the pointers in
1046          * scb to the allocated components
1047          * NOTE: The code to allocate SCB will be duplicated in all the LLD
1048          * since the calling routine does not yet know the number of available
1049          * commands.
1050          */
1051         adapter->kscb_list = kcalloc(MBOX_MAX_SCSI_CMDS, sizeof(scb_t), GFP_KERNEL);
1052 
1053         if (adapter->kscb_list == NULL) {
1054                 con_log(CL_ANN, (KERN_WARNING
1055                         "megaraid: out of memory, %s %d\n", __func__,
1056                         __LINE__));
1057                 goto out_free_ibuf;
1058         }
1059 
1060         // memory allocation for our command packets
1061         if (megaraid_mbox_setup_dma_pools(adapter) != 0) {
1062                 con_log(CL_ANN, (KERN_WARNING
1063                         "megaraid: out of memory, %s %d\n", __func__,
1064                         __LINE__));
1065                 goto out_free_scb_list;
1066         }
1067 
1068         // Adjust the scb pointers and link in the free pool
1069         epthru_pci_blk  = raid_dev->epthru_pool;
1070         sg_pci_blk      = raid_dev->sg_pool;
1071         mbox_pci_blk    = raid_dev->mbox_pool;
1072 
1073         for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
1074                 scb                     = adapter->kscb_list + i;
1075                 ccb                     = raid_dev->ccb_list + i;
1076 
1077                 ccb->mbox       = (mbox_t *)(mbox_pci_blk[i].vaddr + 16);
1078                 ccb->raw_mbox   = (uint8_t *)ccb->mbox;
1079                 ccb->mbox64     = (mbox64_t *)(mbox_pci_blk[i].vaddr + 8);
1080                 ccb->mbox_dma_h = (unsigned long)mbox_pci_blk[i].dma_addr + 16;
1081 
1082                 // make sure the mailbox is aligned properly
1083                 if (ccb->mbox_dma_h & 0x0F) {
1084                         con_log(CL_ANN, (KERN_CRIT
1085                                 "megaraid mbox: not aligned on 16-bytes\n"));
1086 
1087                         goto out_teardown_dma_pools;
1088                 }
1089 
1090                 ccb->epthru             = (mraid_epassthru_t *)
1091                                                 epthru_pci_blk[i].vaddr;
1092                 ccb->epthru_dma_h       = epthru_pci_blk[i].dma_addr;
1093                 ccb->pthru              = (mraid_passthru_t *)ccb->epthru;
1094                 ccb->pthru_dma_h        = ccb->epthru_dma_h;
1095 
1096 
1097                 ccb->sgl64              = (mbox_sgl64 *)sg_pci_blk[i].vaddr;
1098                 ccb->sgl_dma_h          = sg_pci_blk[i].dma_addr;
1099                 ccb->sgl32              = (mbox_sgl32 *)ccb->sgl64;
1100 
1101                 scb->ccb                = (caddr_t)ccb;
1102                 scb->gp                 = 0;
1103 
1104                 scb->sno                = i;    // command index
1105 
1106                 scb->scp                = NULL;
1107                 scb->state              = SCB_FREE;
1108                 scb->dma_direction      = PCI_DMA_NONE;
1109                 scb->dma_type           = MRAID_DMA_NONE;
1110                 scb->dev_channel        = -1;
1111                 scb->dev_target         = -1;
1112 
1113                 // put scb in the free pool
1114                 list_add_tail(&scb->list, &adapter->kscb_pool);
1115         }
1116 
1117         return 0;
1118 
1119 out_teardown_dma_pools:
1120         megaraid_mbox_teardown_dma_pools(adapter);
1121 out_free_scb_list:
1122         kfree(adapter->kscb_list);
1123 out_free_ibuf:
1124         pci_free_consistent(pdev, MBOX_IBUF_SIZE, (void *)adapter->ibuf,
1125                 adapter->ibuf_dma_h);
1126 out_free_common_mbox:
1127         pci_free_consistent(adapter->pdev, sizeof(mbox64_t),
1128                 (caddr_t)raid_dev->una_mbox64, raid_dev->una_mbox64_dma);
1129 
1130         return -1;
1131 }
1132 
1133 
1134 /**
1135  * megaraid_free_cmd_packets - free memory
1136  * @adapter             : soft state of the raid controller
1137  *
1138  * Release memory resources allocated for commands.
1139  */
1140 static void
1141 megaraid_free_cmd_packets(adapter_t *adapter)
1142 {
1143         mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
1144 
1145         megaraid_mbox_teardown_dma_pools(adapter);
1146 
1147         kfree(adapter->kscb_list);
1148 
1149         pci_free_consistent(adapter->pdev, MBOX_IBUF_SIZE,
1150                 (void *)adapter->ibuf, adapter->ibuf_dma_h);
1151 
1152         pci_free_consistent(adapter->pdev, sizeof(mbox64_t),
1153                 (caddr_t)raid_dev->una_mbox64, raid_dev->una_mbox64_dma);
1154         return;
1155 }
1156 
1157 
1158 /**
1159  * megaraid_mbox_setup_dma_pools - setup dma pool for command packets
1160  * @adapter             : HBA soft state
1161  *
1162  * Setup the dma pools for mailbox, passthru and extended passthru structures,
1163  * and scatter-gather lists.
1164  */
1165 static int
1166 megaraid_mbox_setup_dma_pools(adapter_t *adapter)
1167 {
1168         mraid_device_t          *raid_dev = ADAP2RAIDDEV(adapter);
1169         struct mraid_pci_blk    *epthru_pci_blk;
1170         struct mraid_pci_blk    *sg_pci_blk;
1171         struct mraid_pci_blk    *mbox_pci_blk;
1172         int                     i;
1173 
1174 
1175 
1176         // Allocate memory for 16-bytes aligned mailboxes
1177         raid_dev->mbox_pool_handle = pci_pool_create("megaraid mbox pool",
1178                                                 adapter->pdev,
1179                                                 sizeof(mbox64_t) + 16,
1180                                                 16, 0);
1181 
1182         if (raid_dev->mbox_pool_handle == NULL) {
1183                 goto fail_setup_dma_pool;
1184         }
1185 
1186         mbox_pci_blk = raid_dev->mbox_pool;
1187         for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
1188                 mbox_pci_blk[i].vaddr = pci_pool_alloc(
1189                                                 raid_dev->mbox_pool_handle,
1190                                                 GFP_KERNEL,
1191                                                 &mbox_pci_blk[i].dma_addr);
1192                 if (!mbox_pci_blk[i].vaddr) {
1193                         goto fail_setup_dma_pool;
1194                 }
1195         }
1196 
1197         /*
1198          * Allocate memory for each embedded passthru strucuture pointer
1199          * Request for a 128 bytes aligned structure for each passthru command
1200          * structure
1201          * Since passthru and extended passthru commands are exclusive, they
1202          * share common memory pool. Passthru structures piggyback on memory
1203          * allocted to extended passthru since passthru is smaller of the two
1204          */
1205         raid_dev->epthru_pool_handle = pci_pool_create("megaraid mbox pthru",
1206                         adapter->pdev, sizeof(mraid_epassthru_t), 128, 0);
1207 
1208         if (raid_dev->epthru_pool_handle == NULL) {
1209                 goto fail_setup_dma_pool;
1210         }
1211 
1212         epthru_pci_blk = raid_dev->epthru_pool;
1213         for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
1214                 epthru_pci_blk[i].vaddr = pci_pool_alloc(
1215                                                 raid_dev->epthru_pool_handle,
1216                                                 GFP_KERNEL,
1217                                                 &epthru_pci_blk[i].dma_addr);
1218                 if (!epthru_pci_blk[i].vaddr) {
1219                         goto fail_setup_dma_pool;
1220                 }
1221         }
1222 
1223 
1224         // Allocate memory for each scatter-gather list. Request for 512 bytes
1225         // alignment for each sg list
1226         raid_dev->sg_pool_handle = pci_pool_create("megaraid mbox sg",
1227                                         adapter->pdev,
1228                                         sizeof(mbox_sgl64) * MBOX_MAX_SG_SIZE,
1229                                         512, 0);
1230 
1231         if (raid_dev->sg_pool_handle == NULL) {
1232                 goto fail_setup_dma_pool;
1233         }
1234 
1235         sg_pci_blk = raid_dev->sg_pool;
1236         for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
1237                 sg_pci_blk[i].vaddr = pci_pool_alloc(
1238                                                 raid_dev->sg_pool_handle,
1239                                                 GFP_KERNEL,
1240                                                 &sg_pci_blk[i].dma_addr);
1241                 if (!sg_pci_blk[i].vaddr) {
1242                         goto fail_setup_dma_pool;
1243                 }
1244         }
1245 
1246         return 0;
1247 
1248 fail_setup_dma_pool:
1249         megaraid_mbox_teardown_dma_pools(adapter);
1250         return -1;
1251 }
1252 
1253 
1254 /**
1255  * megaraid_mbox_teardown_dma_pools - teardown dma pools for command packets
1256  * @adapter             : HBA soft state
1257  *
1258  * Teardown the dma pool for mailbox, passthru and extended passthru
1259  * structures, and scatter-gather lists.
1260  */
1261 static void
1262 megaraid_mbox_teardown_dma_pools(adapter_t *adapter)
1263 {
1264         mraid_device_t          *raid_dev = ADAP2RAIDDEV(adapter);
1265         struct mraid_pci_blk    *epthru_pci_blk;
1266         struct mraid_pci_blk    *sg_pci_blk;
1267         struct mraid_pci_blk    *mbox_pci_blk;
1268         int                     i;
1269 
1270 
1271         sg_pci_blk = raid_dev->sg_pool;
1272         for (i = 0; i < MBOX_MAX_SCSI_CMDS && sg_pci_blk[i].vaddr; i++) {
1273                 pci_pool_free(raid_dev->sg_pool_handle, sg_pci_blk[i].vaddr,
1274                         sg_pci_blk[i].dma_addr);
1275         }
1276         if (raid_dev->sg_pool_handle)
1277                 pci_pool_destroy(raid_dev->sg_pool_handle);
1278 
1279 
1280         epthru_pci_blk = raid_dev->epthru_pool;
1281         for (i = 0; i < MBOX_MAX_SCSI_CMDS && epthru_pci_blk[i].vaddr; i++) {
1282                 pci_pool_free(raid_dev->epthru_pool_handle,
1283                         epthru_pci_blk[i].vaddr, epthru_pci_blk[i].dma_addr);
1284         }
1285         if (raid_dev->epthru_pool_handle)
1286                 pci_pool_destroy(raid_dev->epthru_pool_handle);
1287 
1288 
1289         mbox_pci_blk = raid_dev->mbox_pool;
1290         for (i = 0; i < MBOX_MAX_SCSI_CMDS && mbox_pci_blk[i].vaddr; i++) {
1291                 pci_pool_free(raid_dev->mbox_pool_handle,
1292                         mbox_pci_blk[i].vaddr, mbox_pci_blk[i].dma_addr);
1293         }
1294         if (raid_dev->mbox_pool_handle)
1295                 pci_pool_destroy(raid_dev->mbox_pool_handle);
1296 
1297         return;
1298 }
1299 
1300 
1301 /**
1302  * megaraid_alloc_scb - detach and return a scb from the free list
1303  * @adapter     : controller's soft state
1304  * @scp         : pointer to the scsi command to be executed
1305  *
1306  * Return the scb from the head of the free list. %NULL if there are none
1307  * available.
1308  */
1309 static scb_t *
1310 megaraid_alloc_scb(adapter_t *adapter, struct scsi_cmnd *scp)
1311 {
1312         struct list_head        *head = &adapter->kscb_pool;
1313         scb_t                   *scb = NULL;
1314         unsigned long           flags;
1315 
1316         // detach scb from free pool
1317         spin_lock_irqsave(SCSI_FREE_LIST_LOCK(adapter), flags);
1318 
1319         if (list_empty(head)) {
1320                 spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);
1321                 return NULL;
1322         }
1323 
1324         scb = list_entry(head->next, scb_t, list);
1325         list_del_init(&scb->list);
1326 
1327         spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);
1328 
1329         scb->state      = SCB_ACTIVE;
1330         scb->scp        = scp;
1331         scb->dma_type   = MRAID_DMA_NONE;
1332 
1333         return scb;
1334 }
1335 
1336 
1337 /**
1338  * megaraid_dealloc_scb - return the scb to the free pool
1339  * @adapter     : controller's soft state
1340  * @scb         : scb to be freed
1341  *
1342  * Return the scb back to the free list of scbs. The caller must 'flush' the
1343  * SCB before calling us. E.g., performing pci_unamp and/or pci_sync etc.
1344  * NOTE NOTE: Make sure the scb is not on any list before calling this
1345  * routine.
1346  */
1347 static inline void
1348 megaraid_dealloc_scb(adapter_t *adapter, scb_t *scb)
1349 {
1350         unsigned long           flags;
1351 
1352         // put scb in the free pool
1353         scb->state      = SCB_FREE;
1354         scb->scp        = NULL;
1355         spin_lock_irqsave(SCSI_FREE_LIST_LOCK(adapter), flags);
1356 
1357         list_add(&scb->list, &adapter->kscb_pool);
1358 
1359         spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);
1360 
1361         return;
1362 }
1363 
1364 
1365 /**
1366  * megaraid_mbox_mksgl - make the scatter-gather list
1367  * @adapter     : controller's soft state
1368  * @scb         : scsi control block
1369  *
1370  * Prepare the scatter-gather list.
1371  */
1372 static int
1373 megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)
1374 {
1375         struct scatterlist      *sgl;
1376         mbox_ccb_t              *ccb;
1377         struct scsi_cmnd        *scp;
1378         int                     sgcnt;
1379         int                     i;
1380 
1381 
1382         scp     = scb->scp;
1383         ccb     = (mbox_ccb_t *)scb->ccb;
1384 
1385         sgcnt = scsi_dma_map(scp);
1386         BUG_ON(sgcnt < 0 || sgcnt > adapter->sglen);
1387 
1388         // no mapping required if no data to be transferred
1389         if (!sgcnt)
1390                 return 0;
1391 
1392         scb->dma_type = MRAID_DMA_WSG;
1393 
1394         scsi_for_each_sg(scp, sgl, sgcnt, i) {
1395                 ccb->sgl64[i].address   = sg_dma_address(sgl);
1396                 ccb->sgl64[i].length    = sg_dma_len(sgl);
1397         }
1398 
1399         // Return count of SG nodes
1400         return sgcnt;
1401 }
1402 
1403 
1404 /**
1405  * mbox_post_cmd - issue a mailbox command
1406  * @adapter     : controller's soft state
1407  * @scb         : command to be issued
1408  *
1409  * Post the command to the controller if mailbox is available.
1410  */
1411 static int
1412 mbox_post_cmd(adapter_t *adapter, scb_t *scb)
1413 {
1414         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
1415         mbox64_t        *mbox64;
1416         mbox_t          *mbox;
1417         mbox_ccb_t      *ccb;
1418         unsigned long   flags;
1419         unsigned int    i = 0;
1420 
1421 
1422         ccb     = (mbox_ccb_t *)scb->ccb;
1423         mbox    = raid_dev->mbox;
1424         mbox64  = raid_dev->mbox64;
1425 
1426         /*
1427          * Check for busy mailbox. If it is, return failure - the caller
1428          * should retry later.
1429          */
1430         spin_lock_irqsave(MAILBOX_LOCK(raid_dev), flags);
1431 
1432         if (unlikely(mbox->busy)) {
1433                 do {
1434                         udelay(1);
1435                         i++;
1436                         rmb();
1437                 } while(mbox->busy && (i < max_mbox_busy_wait));
1438 
1439                 if (mbox->busy) {
1440 
1441                         spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);
1442 
1443                         return -1;
1444                 }
1445         }
1446 
1447 
1448         // Copy this command's mailbox data into "adapter's" mailbox
1449         memcpy((caddr_t)mbox64, (caddr_t)ccb->mbox64, 22);
1450         mbox->cmdid = scb->sno;
1451 
1452         adapter->outstanding_cmds++;
1453 
1454         if (scb->dma_direction == PCI_DMA_TODEVICE)
1455                 pci_dma_sync_sg_for_device(adapter->pdev,
1456                                            scsi_sglist(scb->scp),
1457                                            scsi_sg_count(scb->scp),
1458                                            PCI_DMA_TODEVICE);
1459 
1460         mbox->busy      = 1;    // Set busy
1461         mbox->poll      = 0;
1462         mbox->ack       = 0;
1463         wmb();
1464 
1465         WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
1466 
1467         spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);
1468 
1469         return 0;
1470 }
1471 
1472 
1473 /**
1474  * megaraid_queue_command - generic queue entry point for all LLDs
1475  * @scp         : pointer to the scsi command to be executed
1476  * @done        : callback routine to be called after the cmd has be completed
1477  *
1478  * Queue entry point for mailbox based controllers.
1479  */
1480 static int
1481 megaraid_queue_command_lck(struct scsi_cmnd *scp, void (*done)(struct scsi_cmnd *))
1482 {
1483         adapter_t       *adapter;
1484         scb_t           *scb;
1485         int             if_busy;
1486 
1487         adapter         = SCP2ADAPTER(scp);
1488         scp->scsi_done  = done;
1489         scp->result     = 0;
1490 
1491         /*
1492          * Allocate and build a SCB request
1493          * if_busy flag will be set if megaraid_mbox_build_cmd() command could
1494          * not allocate scb. We will return non-zero status in that case.
1495          * NOTE: scb can be null even though certain commands completed
1496          * successfully, e.g., MODE_SENSE and TEST_UNIT_READY, it would
1497          * return 0 in that case, and we would do the callback right away.
1498          */
1499         if_busy = 0;
1500         scb = megaraid_mbox_build_cmd(adapter, scp, &if_busy);
1501         if (!scb) {     // command already completed
1502                 done(scp);
1503                 return 0;
1504         }
1505 
1506         megaraid_mbox_runpendq(adapter, scb);
1507         return if_busy;
1508 }
1509 
1510 static DEF_SCSI_QCMD(megaraid_queue_command)
1511 
1512 /**
1513  * megaraid_mbox_build_cmd - transform the mid-layer scsi commands
1514  * @adapter     : controller's soft state
1515  * @scp         : mid-layer scsi command pointer
1516  * @busy        : set if request could not be completed because of lack of
1517  *              resources
1518  *
1519  * Transform the mid-layer scsi command to megaraid firmware lingua.
1520  * Convert the command issued by mid-layer to format understood by megaraid
1521  * firmware. We also complete certain commands without sending them to firmware.
1522  */
1523 static scb_t *
1524 megaraid_mbox_build_cmd(adapter_t *adapter, struct scsi_cmnd *scp, int *busy)
1525 {
1526         mraid_device_t          *rdev = ADAP2RAIDDEV(adapter);
1527         int                     channel;
1528         int                     target;
1529         int                     islogical;
1530         mbox_ccb_t              *ccb;
1531         mraid_passthru_t        *pthru;
1532         mbox64_t                *mbox64;
1533         mbox_t                  *mbox;
1534         scb_t                   *scb;
1535         char                    skip[] = "skipping";
1536         char                    scan[] = "scanning";
1537         char                    *ss;
1538 
1539 
1540         /*
1541          * Get the appropriate device map for the device this command is
1542          * intended for
1543          */
1544         MRAID_GET_DEVICE_MAP(adapter, scp, channel, target, islogical);
1545 
1546         /*
1547          * Logical drive commands
1548          */
1549         if (islogical) {
1550                 switch (scp->cmnd[0]) {
1551                 case TEST_UNIT_READY:
1552                         /*
1553                          * Do we support clustering and is the support enabled
1554                          * If no, return success always
1555                          */
1556                         if (!adapter->ha) {
1557                                 scp->result = (DID_OK << 16);
1558                                 return NULL;
1559                         }
1560 
1561                         if (!(scb = megaraid_alloc_scb(adapter, scp))) {
1562                                 scp->result = (DID_ERROR << 16);
1563                                 *busy = 1;
1564                                 return NULL;
1565                         }
1566 
1567                         scb->dma_direction      = scp->sc_data_direction;
1568                         scb->dev_channel        = 0xFF;
1569                         scb->dev_target         = target;
1570                         ccb                     = (mbox_ccb_t *)scb->ccb;
1571 
1572                         /*
1573                          * The command id will be provided by the command
1574                          * issuance routine
1575                          */
1576                         ccb->raw_mbox[0]        = CLUSTER_CMD;
1577                         ccb->raw_mbox[2]        = RESERVATION_STATUS;
1578                         ccb->raw_mbox[3]        = target;
1579 
1580                         return scb;
1581 
1582                 case MODE_SENSE:
1583                 {
1584                         struct scatterlist      *sgl;
1585                         caddr_t                 vaddr;
1586 
1587                         sgl = scsi_sglist(scp);
1588                         if (sg_page(sgl)) {
1589                                 vaddr = (caddr_t) sg_virt(&sgl[0]);
1590 
1591                                 memset(vaddr, 0, scp->cmnd[4]);
1592                         }
1593                         else {
1594                                 con_log(CL_ANN, (KERN_WARNING
1595                                                  "megaraid mailbox: invalid sg:%d\n",
1596                                                  __LINE__));
1597                         }
1598                 }
1599                 scp->result = (DID_OK << 16);
1600                 return NULL;
1601 
1602                 case INQUIRY:
1603                         /*
1604                          * Display the channel scan for logical drives
1605                          * Do not display scan for a channel if already done.
1606                          */
1607                         if (!(rdev->last_disp & (1L << SCP2CHANNEL(scp)))) {
1608 
1609                                 con_log(CL_ANN, (KERN_INFO
1610                                         "scsi[%d]: scanning scsi channel %d",
1611                                         adapter->host->host_no,
1612                                         SCP2CHANNEL(scp)));
1613 
1614                                 con_log(CL_ANN, (
1615                                         " [virtual] for logical drives\n"));
1616 
1617                                 rdev->last_disp |= (1L << SCP2CHANNEL(scp));
1618                         }
1619 
1620                         if (scp->cmnd[1] & MEGA_SCSI_INQ_EVPD) {
1621                                 scp->sense_buffer[0] = 0x70;
1622                                 scp->sense_buffer[2] = ILLEGAL_REQUEST;
1623                                 scp->sense_buffer[12] = MEGA_INVALID_FIELD_IN_CDB;
1624                                 scp->result = CHECK_CONDITION << 1;
1625                                 return NULL;
1626                         }
1627 
1628                         /* Fall through */
1629 
1630                 case READ_CAPACITY:
1631                         /*
1632                          * Do not allow LUN > 0 for logical drives and
1633                          * requests for more than 40 logical drives
1634                          */
1635                         if (SCP2LUN(scp)) {
1636                                 scp->result = (DID_BAD_TARGET << 16);
1637                                 return NULL;
1638                         }
1639                         if ((target % 0x80) >= MAX_LOGICAL_DRIVES_40LD) {
1640                                 scp->result = (DID_BAD_TARGET << 16);
1641                                 return NULL;
1642                         }
1643 
1644 
1645                         /* Allocate a SCB and initialize passthru */
1646                         if (!(scb = megaraid_alloc_scb(adapter, scp))) {
1647                                 scp->result = (DID_ERROR << 16);
1648                                 *busy = 1;
1649                                 return NULL;
1650                         }
1651 
1652                         ccb                     = (mbox_ccb_t *)scb->ccb;
1653                         scb->dev_channel        = 0xFF;
1654                         scb->dev_target         = target;
1655                         pthru                   = ccb->pthru;
1656                         mbox                    = ccb->mbox;
1657                         mbox64                  = ccb->mbox64;
1658 
1659                         pthru->timeout          = 0;
1660                         pthru->ars              = 1;
1661                         pthru->reqsenselen      = 14;
1662                         pthru->islogical        = 1;
1663                         pthru->logdrv           = target;
1664                         pthru->cdblen           = scp->cmd_len;
1665                         memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
1666 
1667                         mbox->cmd               = MBOXCMD_PASSTHRU64;
1668                         scb->dma_direction      = scp->sc_data_direction;
1669 
1670                         pthru->dataxferlen      = scsi_bufflen(scp);
1671                         pthru->dataxferaddr     = ccb->sgl_dma_h;
1672                         pthru->numsge           = megaraid_mbox_mksgl(adapter,
1673                                                         scb);
1674 
1675                         mbox->xferaddr          = 0xFFFFFFFF;
1676                         mbox64->xferaddr_lo     = (uint32_t )ccb->pthru_dma_h;
1677                         mbox64->xferaddr_hi     = 0;
1678 
1679                         return scb;
1680 
1681                 case READ_6:
1682                 case WRITE_6:
1683                 case READ_10:
1684                 case WRITE_10:
1685                 case READ_12:
1686                 case WRITE_12:
1687 
1688                         /*
1689                          * Allocate a SCB and initialize mailbox
1690                          */
1691                         if (!(scb = megaraid_alloc_scb(adapter, scp))) {
1692                                 scp->result = (DID_ERROR << 16);
1693                                 *busy = 1;
1694                                 return NULL;
1695                         }
1696                         ccb                     = (mbox_ccb_t *)scb->ccb;
1697                         scb->dev_channel        = 0xFF;
1698                         scb->dev_target         = target;
1699                         mbox                    = ccb->mbox;
1700                         mbox64                  = ccb->mbox64;
1701                         mbox->logdrv            = target;
1702 
1703                         /*
1704                          * A little HACK: 2nd bit is zero for all scsi read
1705                          * commands and is set for all scsi write commands
1706                          */
1707                         mbox->cmd = (scp->cmnd[0] & 0x02) ?  MBOXCMD_LWRITE64:
1708                                         MBOXCMD_LREAD64 ;
1709 
1710                         /*
1711                          * 6-byte READ(0x08) or WRITE(0x0A) cdb
1712                          */
1713                         if (scp->cmd_len == 6) {
1714                                 mbox->numsectors = (uint32_t)scp->cmnd[4];
1715                                 mbox->lba =
1716                                         ((uint32_t)scp->cmnd[1] << 16)  |
1717                                         ((uint32_t)scp->cmnd[2] << 8)   |
1718                                         (uint32_t)scp->cmnd[3];
1719 
1720                                 mbox->lba &= 0x1FFFFF;
1721                         }
1722 
1723                         /*
1724                          * 10-byte READ(0x28) or WRITE(0x2A) cdb
1725                          */
1726                         else if (scp->cmd_len == 10) {
1727                                 mbox->numsectors =
1728                                         (uint32_t)scp->cmnd[8] |
1729                                         ((uint32_t)scp->cmnd[7] << 8);
1730                                 mbox->lba =
1731                                         ((uint32_t)scp->cmnd[2] << 24) |
1732                                         ((uint32_t)scp->cmnd[3] << 16) |
1733                                         ((uint32_t)scp->cmnd[4] << 8) |
1734                                         (uint32_t)scp->cmnd[5];
1735                         }
1736 
1737                         /*
1738                          * 12-byte READ(0xA8) or WRITE(0xAA) cdb
1739                          */
1740                         else if (scp->cmd_len == 12) {
1741                                 mbox->lba =
1742                                         ((uint32_t)scp->cmnd[2] << 24) |
1743                                         ((uint32_t)scp->cmnd[3] << 16) |
1744                                         ((uint32_t)scp->cmnd[4] << 8) |
1745                                         (uint32_t)scp->cmnd[5];
1746 
1747                                 mbox->numsectors =
1748                                         ((uint32_t)scp->cmnd[6] << 24) |
1749                                         ((uint32_t)scp->cmnd[7] << 16) |
1750                                         ((uint32_t)scp->cmnd[8] << 8) |
1751                                         (uint32_t)scp->cmnd[9];
1752                         }
1753                         else {
1754                                 con_log(CL_ANN, (KERN_WARNING
1755                                         "megaraid: unsupported CDB length\n"));
1756 
1757                                 megaraid_dealloc_scb(adapter, scb);
1758 
1759                                 scp->result = (DID_ERROR << 16);
1760                                 return NULL;
1761                         }
1762 
1763                         scb->dma_direction = scp->sc_data_direction;
1764 
1765                         // Calculate Scatter-Gather info
1766                         mbox64->xferaddr_lo     = (uint32_t )ccb->sgl_dma_h;
1767                         mbox->numsge            = megaraid_mbox_mksgl(adapter,
1768                                                         scb);
1769                         mbox->xferaddr          = 0xFFFFFFFF;
1770                         mbox64->xferaddr_hi     = 0;
1771 
1772                         return scb;
1773 
1774                 case RESERVE:
1775                 case RELEASE:
1776                         /*
1777                          * Do we support clustering and is the support enabled
1778                          */
1779                         if (!adapter->ha) {
1780                                 scp->result = (DID_BAD_TARGET << 16);
1781                                 return NULL;
1782                         }
1783 
1784                         /*
1785                          * Allocate a SCB and initialize mailbox
1786                          */
1787                         if (!(scb = megaraid_alloc_scb(adapter, scp))) {
1788                                 scp->result = (DID_ERROR << 16);
1789                                 *busy = 1;
1790                                 return NULL;
1791                         }
1792 
1793                         ccb                     = (mbox_ccb_t *)scb->ccb;
1794                         scb->dev_channel        = 0xFF;
1795                         scb->dev_target         = target;
1796                         ccb->raw_mbox[0]        = CLUSTER_CMD;
1797                         ccb->raw_mbox[2]        =  (scp->cmnd[0] == RESERVE) ?
1798                                                 RESERVE_LD : RELEASE_LD;
1799 
1800                         ccb->raw_mbox[3]        = target;
1801                         scb->dma_direction      = scp->sc_data_direction;
1802 
1803                         return scb;
1804 
1805                 default:
1806                         scp->result = (DID_BAD_TARGET << 16);
1807                         return NULL;
1808                 }
1809         }
1810         else { // Passthru device commands
1811 
1812                 // Do not allow access to target id > 15 or LUN > 7
1813                 if (target > 15 || SCP2LUN(scp) > 7) {
1814                         scp->result = (DID_BAD_TARGET << 16);
1815                         return NULL;
1816                 }
1817 
1818                 // if fast load option was set and scan for last device is
1819                 // over, reset the fast_load flag so that during a possible
1820                 // next scan, devices can be made available
1821                 if (rdev->fast_load && (target == 15) &&
1822                         (SCP2CHANNEL(scp) == adapter->max_channel -1)) {
1823 
1824                         con_log(CL_ANN, (KERN_INFO
1825                         "megaraid[%d]: physical device scan re-enabled\n",
1826                                 adapter->host->host_no));
1827                         rdev->fast_load = 0;
1828                 }
1829 
1830                 /*
1831                  * Display the channel scan for physical devices
1832                  */
1833                 if (!(rdev->last_disp & (1L << SCP2CHANNEL(scp)))) {
1834 
1835                         ss = rdev->fast_load ? skip : scan;
1836 
1837                         con_log(CL_ANN, (KERN_INFO
1838                                 "scsi[%d]: %s scsi channel %d [Phy %d]",
1839                                 adapter->host->host_no, ss, SCP2CHANNEL(scp),
1840                                 channel));
1841 
1842                         con_log(CL_ANN, (
1843                                 " for non-raid devices\n"));
1844 
1845                         rdev->last_disp |= (1L << SCP2CHANNEL(scp));
1846                 }
1847 
1848                 // disable channel sweep if fast load option given
1849                 if (rdev->fast_load) {
1850                         scp->result = (DID_BAD_TARGET << 16);
1851                         return NULL;
1852                 }
1853 
1854                 // Allocate a SCB and initialize passthru
1855                 if (!(scb = megaraid_alloc_scb(adapter, scp))) {
1856                         scp->result = (DID_ERROR << 16);
1857                         *busy = 1;
1858                         return NULL;
1859                 }
1860 
1861                 ccb                     = (mbox_ccb_t *)scb->ccb;
1862                 scb->dev_channel        = channel;
1863                 scb->dev_target         = target;
1864                 scb->dma_direction      = scp->sc_data_direction;
1865                 mbox                    = ccb->mbox;
1866                 mbox64                  = ccb->mbox64;
1867 
1868                 // Does this firmware support extended CDBs
1869                 if (adapter->max_cdb_sz == 16) {
1870                         mbox->cmd               = MBOXCMD_EXTPTHRU;
1871 
1872                         megaraid_mbox_prepare_epthru(adapter, scb, scp);
1873 
1874                         mbox64->xferaddr_lo     = (uint32_t)ccb->epthru_dma_h;
1875                         mbox64->xferaddr_hi     = 0;
1876                         mbox->xferaddr          = 0xFFFFFFFF;
1877                 }
1878                 else {
1879                         mbox->cmd = MBOXCMD_PASSTHRU64;
1880 
1881                         megaraid_mbox_prepare_pthru(adapter, scb, scp);
1882 
1883                         mbox64->xferaddr_lo     = (uint32_t)ccb->pthru_dma_h;
1884                         mbox64->xferaddr_hi     = 0;
1885                         mbox->xferaddr          = 0xFFFFFFFF;
1886                 }
1887                 return scb;
1888         }
1889 
1890         // NOT REACHED
1891 }
1892 
1893 
1894 /**
1895  * megaraid_mbox_runpendq - execute commands queued in the pending queue
1896  * @adapter     : controller's soft state
1897  * @scb_q       : SCB to be queued in the pending list
1898  *
1899  * Scan the pending list for commands which are not yet issued and try to
1900  * post to the controller. The SCB can be a null pointer, which would indicate
1901  * no SCB to be queue, just try to execute the ones in the pending list.
1902  *
1903  * NOTE: We do not actually traverse the pending list. The SCBs are plucked
1904  * out from the head of the pending list. If it is successfully issued, the
1905  * next SCB is at the head now.
1906  */
1907 static void
1908 megaraid_mbox_runpendq(adapter_t *adapter, scb_t *scb_q)
1909 {
1910         scb_t                   *scb;
1911         unsigned long           flags;
1912 
1913         spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
1914 
1915         if (scb_q) {
1916                 scb_q->state = SCB_PENDQ;
1917                 list_add_tail(&scb_q->list, &adapter->pend_list);
1918         }
1919 
1920         // if the adapter in not in quiescent mode, post the commands to FW
1921         if (adapter->quiescent) {
1922                 spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
1923                 return;
1924         }
1925 
1926         while (!list_empty(&adapter->pend_list)) {
1927 
1928                 assert_spin_locked(PENDING_LIST_LOCK(adapter));
1929 
1930                 scb = list_entry(adapter->pend_list.next, scb_t, list);
1931 
1932                 // remove the scb from the pending list and try to
1933                 // issue. If we are unable to issue it, put back in
1934                 // the pending list and return
1935 
1936                 list_del_init(&scb->list);
1937 
1938                 spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
1939 
1940                 // if mailbox was busy, return SCB back to pending
1941                 // list. Make sure to add at the head, since that's
1942                 // where it would have been removed from
1943 
1944                 scb->state = SCB_ISSUED;
1945 
1946                 if (mbox_post_cmd(adapter, scb) != 0) {
1947 
1948                         spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
1949 
1950                         scb->state = SCB_PENDQ;
1951 
1952                         list_add(&scb->list, &adapter->pend_list);
1953 
1954                         spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter),
1955                                 flags);
1956 
1957                         return;
1958                 }
1959 
1960                 spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
1961         }
1962 
1963         spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
1964 
1965 
1966         return;
1967 }
1968 
1969 
1970 /**
1971  * megaraid_mbox_prepare_pthru - prepare a command for physical devices
1972  * @adapter     : pointer to controller's soft state
1973  * @scb         : scsi control block
1974  * @scp         : scsi command from the mid-layer
1975  *
1976  * Prepare a command for the scsi physical devices.
1977  */
1978 static void
1979 megaraid_mbox_prepare_pthru(adapter_t *adapter, scb_t *scb,
1980                 struct scsi_cmnd *scp)
1981 {
1982         mbox_ccb_t              *ccb;
1983         mraid_passthru_t        *pthru;
1984         uint8_t                 channel;
1985         uint8_t                 target;
1986 
1987         ccb     = (mbox_ccb_t *)scb->ccb;
1988         pthru   = ccb->pthru;
1989         channel = scb->dev_channel;
1990         target  = scb->dev_target;
1991 
1992         // 0=6sec, 1=60sec, 2=10min, 3=3hrs, 4=NO timeout
1993         pthru->timeout          = 4;    
1994         pthru->ars              = 1;
1995         pthru->islogical        = 0;
1996         pthru->channel          = 0;
1997         pthru->target           = (channel << 4) | target;
1998         pthru->logdrv           = SCP2LUN(scp);
1999         pthru->reqsenselen      = 14;
2000         pthru->cdblen           = scp->cmd_len;
2001 
2002         memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
2003 
2004         if (scsi_bufflen(scp)) {
2005                 pthru->dataxferlen      = scsi_bufflen(scp);
2006                 pthru->dataxferaddr     = ccb->sgl_dma_h;
2007                 pthru->numsge           = megaraid_mbox_mksgl(adapter, scb);
2008         }
2009         else {
2010                 pthru->dataxferaddr     = 0;
2011                 pthru->dataxferlen      = 0;
2012                 pthru->numsge           = 0;
2013         }
2014         return;
2015 }
2016 
2017 
2018 /**
2019  * megaraid_mbox_prepare_epthru - prepare a command for physical devices
2020  * @adapter     : pointer to controller's soft state
2021  * @scb         : scsi control block
2022  * @scp         : scsi command from the mid-layer
2023  *
2024  * Prepare a command for the scsi physical devices. This routine prepares
2025  * commands for devices which can take extended CDBs (>10 bytes).
2026  */
2027 static void
2028 megaraid_mbox_prepare_epthru(adapter_t *adapter, scb_t *scb,
2029                 struct scsi_cmnd *scp)
2030 {
2031         mbox_ccb_t              *ccb;
2032         mraid_epassthru_t       *epthru;
2033         uint8_t                 channel;
2034         uint8_t                 target;
2035 
2036         ccb     = (mbox_ccb_t *)scb->ccb;
2037         epthru  = ccb->epthru;
2038         channel = scb->dev_channel;
2039         target  = scb->dev_target;
2040 
2041         // 0=6sec, 1=60sec, 2=10min, 3=3hrs, 4=NO timeout
2042         epthru->timeout         = 4;    
2043         epthru->ars             = 1;
2044         epthru->islogical       = 0;
2045         epthru->channel         = 0;
2046         epthru->target          = (channel << 4) | target;
2047         epthru->logdrv          = SCP2LUN(scp);
2048         epthru->reqsenselen     = 14;
2049         epthru->cdblen          = scp->cmd_len;
2050 
2051         memcpy(epthru->cdb, scp->cmnd, scp->cmd_len);
2052 
2053         if (scsi_bufflen(scp)) {
2054                 epthru->dataxferlen     = scsi_bufflen(scp);
2055                 epthru->dataxferaddr    = ccb->sgl_dma_h;
2056                 epthru->numsge          = megaraid_mbox_mksgl(adapter, scb);
2057         }
2058         else {
2059                 epthru->dataxferaddr    = 0;
2060                 epthru->dataxferlen     = 0;
2061                 epthru->numsge          = 0;
2062         }
2063         return;
2064 }
2065 
2066 
2067 /**
2068  * megaraid_ack_sequence - interrupt ack sequence for memory mapped HBAs
2069  * @adapter     : controller's soft state
2070  *
2071  * Interrupt acknowledgement sequence for memory mapped HBAs. Find out the
2072  * completed command and put them on the completed list for later processing.
2073  *
2074  * Returns:     1 if the interrupt is valid, 0 otherwise
2075  */
2076 static int
2077 megaraid_ack_sequence(adapter_t *adapter)
2078 {
2079         mraid_device_t          *raid_dev = ADAP2RAIDDEV(adapter);
2080         mbox_t                  *mbox;
2081         scb_t                   *scb;
2082         uint8_t                 nstatus;
2083         uint8_t                 completed[MBOX_MAX_FIRMWARE_STATUS];
2084         struct list_head        clist;
2085         int                     handled;
2086         uint32_t                dword;
2087         unsigned long           flags;
2088         int                     i, j;
2089 
2090 
2091         mbox    = raid_dev->mbox;
2092 
2093         // move the SCBs from the firmware completed array to our local list
2094         INIT_LIST_HEAD(&clist);
2095 
2096         // loop till F/W has more commands for us to complete
2097         handled = 0;
2098         spin_lock_irqsave(MAILBOX_LOCK(raid_dev), flags);
2099         do {
2100                 /*
2101                  * Check if a valid interrupt is pending. If found, force the
2102                  * interrupt line low.
2103                  */
2104                 dword = RDOUTDOOR(raid_dev);
2105                 if (dword != 0x10001234) break;
2106 
2107                 handled = 1;
2108 
2109                 WROUTDOOR(raid_dev, 0x10001234);
2110 
2111                 nstatus = 0;
2112                 // wait for valid numstatus to post
2113                 for (i = 0; i < 0xFFFFF; i++) {
2114                         if (mbox->numstatus != 0xFF) {
2115                                 nstatus = mbox->numstatus;
2116                                 break;
2117                         }
2118                         rmb();
2119                 }
2120                 mbox->numstatus = 0xFF;
2121 
2122                 adapter->outstanding_cmds -= nstatus;
2123 
2124                 for (i = 0; i < nstatus; i++) {
2125 
2126                         // wait for valid command index to post
2127                         for (j = 0; j < 0xFFFFF; j++) {
2128                                 if (mbox->completed[i] != 0xFF) break;
2129                                 rmb();
2130                         }
2131                         completed[i]            = mbox->completed[i];
2132                         mbox->completed[i]      = 0xFF;
2133 
2134                         if (completed[i] == 0xFF) {
2135                                 con_log(CL_ANN, (KERN_CRIT
2136                                 "megaraid: command posting timed out\n"));
2137 
2138                                 BUG();
2139                                 continue;
2140                         }
2141 
2142                         // Get SCB associated with this command id
2143                         if (completed[i] >= MBOX_MAX_SCSI_CMDS) {
2144                                 // a cmm command
2145                                 scb = adapter->uscb_list + (completed[i] -
2146                                                 MBOX_MAX_SCSI_CMDS);
2147                         }
2148                         else {
2149                                 // an os command
2150                                 scb = adapter->kscb_list + completed[i];
2151                         }
2152 
2153                         scb->status = mbox->status;
2154                         list_add_tail(&scb->list, &clist);
2155                 }
2156 
2157                 // Acknowledge interrupt
2158                 WRINDOOR(raid_dev, 0x02);
2159 
2160         } while(1);
2161 
2162         spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);
2163 
2164 
2165         // put the completed commands in the completed list. DPC would
2166         // complete these commands later
2167         spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
2168 
2169         list_splice(&clist, &adapter->completed_list);
2170 
2171         spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);
2172 
2173 
2174         // schedule the DPC if there is some work for it
2175         if (handled)
2176                 tasklet_schedule(&adapter->dpc_h);
2177 
2178         return handled;
2179 }
2180 
2181 
2182 /**
2183  * megaraid_isr - isr for memory based mailbox based controllers
2184  * @irq         : irq
2185  * @devp        : pointer to our soft state
2186  *
2187  * Interrupt service routine for memory-mapped mailbox controllers.
2188  */
2189 static irqreturn_t
2190 megaraid_isr(int irq, void *devp)
2191 {
2192         adapter_t       *adapter = devp;
2193         int             handled;
2194 
2195         handled = megaraid_ack_sequence(adapter);
2196 
2197         /* Loop through any pending requests */
2198         if (!adapter->quiescent) {
2199                 megaraid_mbox_runpendq(adapter, NULL);
2200         }
2201 
2202         return IRQ_RETVAL(handled);
2203 }
2204 
2205 
2206 /**
2207  * megaraid_mbox_sync_scb - sync kernel buffers
2208  * @adapter     : controller's soft state
2209  * @scb         : pointer to the resource packet
2210  *
2211  * DMA sync if required.
2212  */
2213 static void
2214 megaraid_mbox_sync_scb(adapter_t *adapter, scb_t *scb)
2215 {
2216         mbox_ccb_t      *ccb;
2217 
2218         ccb     = (mbox_ccb_t *)scb->ccb;
2219 
2220         if (scb->dma_direction == PCI_DMA_FROMDEVICE)
2221                 pci_dma_sync_sg_for_cpu(adapter->pdev,
2222                                         scsi_sglist(scb->scp),
2223                                         scsi_sg_count(scb->scp),
2224                                         PCI_DMA_FROMDEVICE);
2225 
2226         scsi_dma_unmap(scb->scp);
2227         return;
2228 }
2229 
2230 
2231 /**
2232  * megaraid_mbox_dpc - the tasklet to complete the commands from completed list
2233  * @devp        : pointer to HBA soft state
2234  *
2235  * Pick up the commands from the completed list and send back to the owners.
2236  * This is a reentrant function and does not assume any locks are held while
2237  * it is being called.
2238  */
2239 static void
2240 megaraid_mbox_dpc(unsigned long devp)
2241 {
2242         adapter_t               *adapter = (adapter_t *)devp;
2243         mraid_device_t          *raid_dev;
2244         struct list_head        clist;
2245         struct scatterlist      *sgl;
2246         scb_t                   *scb;
2247         scb_t                   *tmp;
2248         struct scsi_cmnd        *scp;
2249         mraid_passthru_t        *pthru;
2250         mraid_epassthru_t       *epthru;
2251         mbox_ccb_t              *ccb;
2252         int                     islogical;
2253         int                     pdev_index;
2254         int                     pdev_state;
2255         mbox_t                  *mbox;
2256         unsigned long           flags;
2257         uint8_t                 c;
2258         int                     status;
2259         uioc_t                  *kioc;
2260 
2261 
2262         if (!adapter) return;
2263 
2264         raid_dev = ADAP2RAIDDEV(adapter);
2265 
2266         // move the SCBs from the completed list to our local list
2267         INIT_LIST_HEAD(&clist);
2268 
2269         spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
2270 
2271         list_splice_init(&adapter->completed_list, &clist);
2272 
2273         spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);
2274 
2275 
2276         list_for_each_entry_safe(scb, tmp, &clist, list) {
2277 
2278                 status          = scb->status;
2279                 scp             = scb->scp;
2280                 ccb             = (mbox_ccb_t *)scb->ccb;
2281                 pthru           = ccb->pthru;
2282                 epthru          = ccb->epthru;
2283                 mbox            = ccb->mbox;
2284 
2285                 // Make sure f/w has completed a valid command
2286                 if (scb->state != SCB_ISSUED) {
2287                         con_log(CL_ANN, (KERN_CRIT
2288                         "megaraid critical err: invalid command %d:%d:%p\n",
2289                                 scb->sno, scb->state, scp));
2290                         BUG();
2291                         continue;       // Must never happen!
2292                 }
2293 
2294                 // check for the management command and complete it right away
2295                 if (scb->sno >= MBOX_MAX_SCSI_CMDS) {
2296                         scb->state      = SCB_FREE;
2297                         scb->status     = status;
2298 
2299                         // remove from local clist
2300                         list_del_init(&scb->list);
2301 
2302                         kioc                    = (uioc_t *)scb->gp;
2303                         kioc->status            = 0;
2304 
2305                         megaraid_mbox_mm_done(adapter, scb);
2306 
2307                         continue;
2308                 }
2309 
2310                 // Was an abort issued for this command earlier
2311                 if (scb->state & SCB_ABORT) {
2312                         con_log(CL_ANN, (KERN_NOTICE
2313                         "megaraid: aborted cmd [%x] completed\n",
2314                                 scb->sno));
2315                 }
2316 
2317                 /*
2318                  * If the inquiry came of a disk drive which is not part of
2319                  * any RAID array, expose it to the kernel. For this to be
2320                  * enabled, user must set the "megaraid_expose_unconf_disks"
2321                  * flag to 1 by specifying it on module parameter list.
2322                  * This would enable data migration off drives from other
2323                  * configurations.
2324                  */
2325                 islogical = MRAID_IS_LOGICAL(adapter, scp);
2326                 if (scp->cmnd[0] == INQUIRY && status == 0 && islogical == 0
2327                                 && IS_RAID_CH(raid_dev, scb->dev_channel)) {
2328 
2329                         sgl = scsi_sglist(scp);
2330                         if (sg_page(sgl)) {
2331                                 c = *(unsigned char *) sg_virt(&sgl[0]);
2332                         } else {
2333                                 con_log(CL_ANN, (KERN_WARNING
2334                                                  "megaraid mailbox: invalid sg:%d\n",
2335                                                  __LINE__));
2336                                 c = 0;
2337                         }
2338 
2339                         if ((c & 0x1F ) == TYPE_DISK) {
2340                                 pdev_index = (scb->dev_channel * 16) +
2341                                         scb->dev_target;
2342                                 pdev_state =
2343                                         raid_dev->pdrv_state[pdev_index] & 0x0F;
2344 
2345                                 if (pdev_state == PDRV_ONLINE           ||
2346                                         pdev_state == PDRV_FAILED       ||
2347                                         pdev_state == PDRV_RBLD         ||
2348                                         pdev_state == PDRV_HOTSPARE     ||
2349                                         megaraid_expose_unconf_disks == 0) {
2350 
2351                                         status = 0xF0;
2352                                 }
2353                         }
2354                 }
2355 
2356                 // Convert MegaRAID status to Linux error code
2357                 switch (status) {
2358 
2359                 case 0x00:
2360 
2361                         scp->result = (DID_OK << 16);
2362                         break;
2363 
2364                 case 0x02:
2365 
2366                         /* set sense_buffer and result fields */
2367                         if (mbox->cmd == MBOXCMD_PASSTHRU ||
2368                                 mbox->cmd == MBOXCMD_PASSTHRU64) {
2369 
2370                                 memcpy(scp->sense_buffer, pthru->reqsensearea,
2371                                                 14);
2372 
2373                                 scp->result = DRIVER_SENSE << 24 |
2374                                         DID_OK << 16 | CHECK_CONDITION << 1;
2375                         }
2376                         else {
2377                                 if (mbox->cmd == MBOXCMD_EXTPTHRU) {
2378 
2379                                         memcpy(scp->sense_buffer,
2380                                                 epthru->reqsensearea, 14);
2381 
2382                                         scp->result = DRIVER_SENSE << 24 |
2383                                                 DID_OK << 16 |
2384                                                 CHECK_CONDITION << 1;
2385                                 } else {
2386                                         scp->sense_buffer[0] = 0x70;
2387                                         scp->sense_buffer[2] = ABORTED_COMMAND;
2388                                         scp->result = CHECK_CONDITION << 1;
2389                                 }
2390                         }
2391                         break;
2392 
2393                 case 0x08:
2394 
2395                         scp->result = DID_BUS_BUSY << 16 | status;
2396                         break;
2397 
2398                 default:
2399 
2400                         /*
2401                          * If TEST_UNIT_READY fails, we know RESERVATION_STATUS
2402                          * failed
2403                          */
2404                         if (scp->cmnd[0] == TEST_UNIT_READY) {
2405                                 scp->result = DID_ERROR << 16 |
2406                                         RESERVATION_CONFLICT << 1;
2407                         }
2408                         else
2409                         /*
2410                          * Error code returned is 1 if Reserve or Release
2411                          * failed or the input parameter is invalid
2412                          */
2413                         if (status == 1 && (scp->cmnd[0] == RESERVE ||
2414                                          scp->cmnd[0] == RELEASE)) {
2415 
2416                                 scp->result = DID_ERROR << 16 |
2417                                         RESERVATION_CONFLICT << 1;
2418                         }
2419                         else {
2420                                 scp->result = DID_BAD_TARGET << 16 | status;
2421                         }
2422                 }
2423 
2424                 // print a debug message for all failed commands
2425                 if (status) {
2426                         megaraid_mbox_display_scb(adapter, scb);
2427                 }
2428 
2429                 // Free our internal resources and call the mid-layer callback
2430                 // routine
2431                 megaraid_mbox_sync_scb(adapter, scb);
2432 
2433                 // remove from local clist
2434                 list_del_init(&scb->list);
2435 
2436                 // put back in free list
2437                 megaraid_dealloc_scb(adapter, scb);
2438 
2439                 // send the scsi packet back to kernel
2440                 scp->scsi_done(scp);
2441         }
2442 
2443         return;
2444 }
2445 
2446 
2447 /**
2448  * megaraid_abort_handler - abort the scsi command
2449  * @scp         : command to be aborted
2450  *
2451  * Abort a previous SCSI request. Only commands on the pending list can be
2452  * aborted. All the commands issued to the F/W must complete.
2453  **/
2454 static int
2455 megaraid_abort_handler(struct scsi_cmnd *scp)
2456 {
2457         adapter_t               *adapter;
2458         mraid_device_t          *raid_dev;
2459         scb_t                   *scb;
2460         scb_t                   *tmp;
2461         int                     found;
2462         unsigned long           flags;
2463         int                     i;
2464 
2465 
2466         adapter         = SCP2ADAPTER(scp);
2467         raid_dev        = ADAP2RAIDDEV(adapter);
2468 
2469         con_log(CL_ANN, (KERN_WARNING
2470                 "megaraid: aborting cmd=%x <c=%d t=%d l=%d>\n",
2471                 scp->cmnd[0], SCP2CHANNEL(scp),
2472                 SCP2TARGET(scp), SCP2LUN(scp)));
2473 
2474         // If FW has stopped responding, simply return failure
2475         if (raid_dev->hw_error) {
2476                 con_log(CL_ANN, (KERN_NOTICE
2477                         "megaraid: hw error, not aborting\n"));
2478                 return FAILED;
2479         }
2480 
2481         // There might a race here, where the command was completed by the
2482         // firmware and now it is on the completed list. Before we could
2483         // complete the command to the kernel in dpc, the abort came.
2484         // Find out if this is the case to avoid the race.
2485         scb = NULL;
2486         spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
2487         list_for_each_entry_safe(scb, tmp, &adapter->completed_list, list) {
2488 
2489                 if (scb->scp == scp) {  // Found command
2490 
2491                         list_del_init(&scb->list);      // from completed list
2492 
2493                         con_log(CL_ANN, (KERN_WARNING
2494                         "megaraid: %d[%d:%d], abort from completed list\n",
2495                                 scb->sno, scb->dev_channel, scb->dev_target));
2496 
2497                         scp->result = (DID_ABORT << 16);
2498                         scp->scsi_done(scp);
2499 
2500                         megaraid_dealloc_scb(adapter, scb);
2501 
2502                         spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter),
2503                                 flags);
2504 
2505                         return SUCCESS;
2506                 }
2507         }
2508         spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);
2509 
2510 
2511         // Find out if this command is still on the pending list. If it is and
2512         // was never issued, abort and return success. If the command is owned
2513         // by the firmware, we must wait for it to complete by the FW.
2514         spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
2515         list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {
2516 
2517                 if (scb->scp == scp) {  // Found command
2518 
2519                         list_del_init(&scb->list);      // from pending list
2520 
2521                         ASSERT(!(scb->state & SCB_ISSUED));
2522 
2523                         con_log(CL_ANN, (KERN_WARNING
2524                                 "megaraid abort: [%d:%d], driver owner\n",
2525                                 scb->dev_channel, scb->dev_target));
2526 
2527                         scp->result = (DID_ABORT << 16);
2528                         scp->scsi_done(scp);
2529 
2530                         megaraid_dealloc_scb(adapter, scb);
2531 
2532                         spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter),
2533                                 flags);
2534 
2535                         return SUCCESS;
2536                 }
2537         }
2538         spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
2539 
2540 
2541         // Check do we even own this command, in which case this would be
2542         // owned by the firmware. The only way to locate the FW scb is to
2543         // traverse through the list of all SCB, since driver does not
2544         // maintain these SCBs on any list
2545         found = 0;
2546         spin_lock_irq(&adapter->lock);
2547         for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
2548                 scb = adapter->kscb_list + i;
2549 
2550                 if (scb->scp == scp) {
2551 
2552                         found = 1;
2553 
2554                         if (!(scb->state & SCB_ISSUED)) {
2555                                 con_log(CL_ANN, (KERN_WARNING
2556                                 "megaraid abort: %d[%d:%d], invalid state\n",
2557                                 scb->sno, scb->dev_channel, scb->dev_target));
2558                                 BUG();
2559                         }
2560                         else {
2561                                 con_log(CL_ANN, (KERN_WARNING
2562                                 "megaraid abort: %d[%d:%d], fw owner\n",
2563                                 scb->sno, scb->dev_channel, scb->dev_target));
2564                         }
2565                 }
2566         }
2567         spin_unlock_irq(&adapter->lock);
2568 
2569         if (!found) {
2570                 con_log(CL_ANN, (KERN_WARNING "megaraid abort: do now own\n"));
2571 
2572                 // FIXME: Should there be a callback for this command?
2573                 return SUCCESS;
2574         }
2575 
2576         // We cannot actually abort a command owned by firmware, return
2577         // failure and wait for reset. In host reset handler, we will find out
2578         // if the HBA is still live
2579         return FAILED;
2580 }
2581 
2582 /**
2583  * megaraid_reset_handler - device reset handler for mailbox based driver
2584  * @scp         : reference command
2585  *
2586  * Reset handler for the mailbox based controller. First try to find out if
2587  * the FW is still live, in which case the outstanding commands counter mut go
2588  * down to 0. If that happens, also issue the reservation reset command to
2589  * relinquish (possible) reservations on the logical drives connected to this
2590  * host.
2591  **/
2592 static int
2593 megaraid_reset_handler(struct scsi_cmnd *scp)
2594 {
2595         adapter_t       *adapter;
2596         scb_t           *scb;
2597         scb_t           *tmp;
2598         mraid_device_t  *raid_dev;
2599         unsigned long   flags;
2600         uint8_t         raw_mbox[sizeof(mbox_t)];
2601         int             rval;
2602         int             recovery_window;
2603         int             recovering;
2604         int             i;
2605         uioc_t          *kioc;
2606 
2607         adapter         = SCP2ADAPTER(scp);
2608         raid_dev        = ADAP2RAIDDEV(adapter);
2609 
2610         // return failure if adapter is not responding
2611         if (raid_dev->hw_error) {
2612                 con_log(CL_ANN, (KERN_NOTICE
2613                         "megaraid: hw error, cannot reset\n"));
2614                 return FAILED;
2615         }
2616 
2617 
2618         // Under exceptional conditions, FW can take up to 3 minutes to
2619         // complete command processing. Wait for additional 2 minutes for the
2620         // pending commands counter to go down to 0. If it doesn't, let the
2621         // controller be marked offline
2622         // Also, reset all the commands currently owned by the driver
2623         spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
2624         list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {
2625                 list_del_init(&scb->list);      // from pending list
2626 
2627                 if (scb->sno >= MBOX_MAX_SCSI_CMDS) {
2628                         con_log(CL_ANN, (KERN_WARNING
2629                         "megaraid: IOCTL packet with %d[%d:%d] being reset\n",
2630                         scb->sno, scb->dev_channel, scb->dev_target));
2631 
2632                         scb->status = -1;
2633 
2634                         kioc                    = (uioc_t *)scb->gp;
2635                         kioc->status            = -EFAULT;
2636 
2637                         megaraid_mbox_mm_done(adapter, scb);
2638                 } else {
2639                         if (scb->scp == scp) {  // Found command
2640                                 con_log(CL_ANN, (KERN_WARNING
2641                                         "megaraid: %d[%d:%d], reset from pending list\n",
2642                                         scb->sno, scb->dev_channel, scb->dev_target));
2643                         } else {
2644                                 con_log(CL_ANN, (KERN_WARNING
2645                                 "megaraid: IO packet with %d[%d:%d] being reset\n",
2646                                 scb->sno, scb->dev_channel, scb->dev_target));
2647                         }
2648 
2649                         scb->scp->result = (DID_RESET << 16);
2650                         scb->scp->scsi_done(scb->scp);
2651 
2652                         megaraid_dealloc_scb(adapter, scb);
2653                 }
2654         }
2655         spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
2656 
2657         if (adapter->outstanding_cmds) {
2658                 con_log(CL_ANN, (KERN_NOTICE
2659                         "megaraid: %d outstanding commands. Max wait %d sec\n",
2660                         adapter->outstanding_cmds,
2661                         (MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT)));
2662         }
2663 
2664         recovery_window = MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT;
2665 
2666         recovering = adapter->outstanding_cmds;
2667 
2668         for (i = 0; i < recovery_window; i++) {
2669 
2670                 megaraid_ack_sequence(adapter);
2671 
2672                 // print a message once every 5 seconds only
2673                 if (!(i % 5)) {
2674                         con_log(CL_ANN, (
2675                         "megaraid mbox: Wait for %d commands to complete:%d\n",
2676                                 adapter->outstanding_cmds,
2677                                 (MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT) - i));
2678                 }
2679 
2680                 // bailout if no recovery happened in reset time
2681                 if (adapter->outstanding_cmds == 0) {
2682                         break;
2683                 }
2684 
2685                 msleep(1000);
2686         }
2687 
2688         spin_lock(&adapter->lock);
2689 
2690         // If still outstanding commands, bail out
2691         if (adapter->outstanding_cmds) {
2692                 con_log(CL_ANN, (KERN_WARNING
2693                         "megaraid mbox: critical hardware error!\n"));
2694 
2695                 raid_dev->hw_error = 1;
2696 
2697                 rval = FAILED;
2698                 goto out;
2699         }
2700         else {
2701                 con_log(CL_ANN, (KERN_NOTICE
2702                 "megaraid mbox: reset sequence completed successfully\n"));
2703         }
2704 
2705 
2706         // If the controller supports clustering, reset reservations
2707         if (!adapter->ha) {
2708                 rval = SUCCESS;
2709                 goto out;
2710         }
2711 
2712         // clear reservations if any
2713         raw_mbox[0] = CLUSTER_CMD;
2714         raw_mbox[2] = RESET_RESERVATIONS;
2715 
2716         rval = SUCCESS;
2717         if (mbox_post_sync_cmd_fast(adapter, raw_mbox) == 0) {
2718                 con_log(CL_ANN,
2719                         (KERN_INFO "megaraid: reservation reset\n"));
2720         }
2721         else {
2722                 rval = FAILED;
2723                 con_log(CL_ANN, (KERN_WARNING
2724                                 "megaraid: reservation reset failed\n"));
2725         }
2726 
2727  out:
2728         spin_unlock(&adapter->lock);
2729         return rval;
2730 }
2731 
2732 /*
2733  * START: internal commands library
2734  *
2735  * This section of the driver has the common routine used by the driver and
2736  * also has all the FW routines
2737  */
2738 
2739 /**
2740  * mbox_post_sync_cmd() - blocking command to the mailbox based controllers
2741  * @adapter     : controller's soft state
2742  * @raw_mbox    : the mailbox
2743  *
2744  * Issue a scb in synchronous and non-interrupt mode for mailbox based
2745  * controllers.
2746  */
2747 static int
2748 mbox_post_sync_cmd(adapter_t *adapter, uint8_t raw_mbox[])
2749 {
2750         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
2751         mbox64_t        *mbox64;
2752         mbox_t          *mbox;
2753         uint8_t         status;
2754         int             i;
2755 
2756 
2757         mbox64  = raid_dev->mbox64;
2758         mbox    = raid_dev->mbox;
2759 
2760         /*
2761          * Wait until mailbox is free
2762          */
2763         if (megaraid_busywait_mbox(raid_dev) != 0)
2764                 goto blocked_mailbox;
2765 
2766         /*
2767          * Copy mailbox data into host structure
2768          */
2769         memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 16);
2770         mbox->cmdid             = 0xFE;
2771         mbox->busy              = 1;
2772         mbox->poll              = 0;
2773         mbox->ack               = 0;
2774         mbox->numstatus         = 0xFF;
2775         mbox->status            = 0xFF;
2776 
2777         wmb();
2778         WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
2779 
2780         // wait for maximum 1 second for status to post. If the status is not
2781         // available within 1 second, assume FW is initializing and wait
2782         // for an extended amount of time
2783         if (mbox->numstatus == 0xFF) {  // status not yet available
2784                 udelay(25);
2785 
2786                 for (i = 0; mbox->numstatus == 0xFF && i < 1000; i++) {
2787                         rmb();
2788                         msleep(1);
2789                 }
2790 
2791 
2792                 if (i == 1000) {
2793                         con_log(CL_ANN, (KERN_NOTICE
2794                                 "megaraid mailbox: wait for FW to boot      "));
2795 
2796                         for (i = 0; (mbox->numstatus == 0xFF) &&
2797                                         (i < MBOX_RESET_WAIT); i++) {
2798                                 rmb();
2799                                 con_log(CL_ANN, ("\b\b\b\b\b[%03d]",
2800                                                         MBOX_RESET_WAIT - i));
2801                                 msleep(1000);
2802                         }
2803 
2804                         if (i == MBOX_RESET_WAIT) {
2805 
2806                                 con_log(CL_ANN, (
2807                                 "\nmegaraid mailbox: status not available\n"));
2808 
2809                                 return -1;
2810                         }
2811                         con_log(CL_ANN, ("\b\b\b\b\b[ok] \n"));
2812                 }
2813         }
2814 
2815         // wait for maximum 1 second for poll semaphore
2816         if (mbox->poll != 0x77) {
2817                 udelay(25);
2818 
2819                 for (i = 0; (mbox->poll != 0x77) && (i < 1000); i++) {
2820                         rmb();
2821                         msleep(1);
2822                 }
2823 
2824                 if (i == 1000) {
2825                         con_log(CL_ANN, (KERN_WARNING
2826                         "megaraid mailbox: could not get poll semaphore\n"));
2827                         return -1;
2828                 }
2829         }
2830 
2831         WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x2);
2832         wmb();
2833 
2834         // wait for maximum 1 second for acknowledgement
2835         if (RDINDOOR(raid_dev) & 0x2) {
2836                 udelay(25);
2837 
2838                 for (i = 0; (RDINDOOR(raid_dev) & 0x2) && (i < 1000); i++) {
2839                         rmb();
2840                         msleep(1);
2841                 }
2842 
2843                 if (i == 1000) {
2844                         con_log(CL_ANN, (KERN_WARNING
2845                                 "megaraid mailbox: could not acknowledge\n"));
2846                         return -1;
2847                 }
2848         }
2849         mbox->poll      = 0;
2850         mbox->ack       = 0x77;
2851 
2852         status = mbox->status;
2853 
2854         // invalidate the completed command id array. After command
2855         // completion, firmware would write the valid id.
2856         mbox->numstatus = 0xFF;
2857         mbox->status    = 0xFF;
2858         for (i = 0; i < MBOX_MAX_FIRMWARE_STATUS; i++) {
2859                 mbox->completed[i] = 0xFF;
2860         }
2861 
2862         return status;
2863 
2864 blocked_mailbox:
2865 
2866         con_log(CL_ANN, (KERN_WARNING "megaraid: blocked mailbox\n") );
2867         return -1;
2868 }
2869 
2870 
2871 /**
2872  * mbox_post_sync_cmd_fast - blocking command to the mailbox based controllers
2873  * @adapter     : controller's soft state
2874  * @raw_mbox    : the mailbox
2875  *
2876  * Issue a scb in synchronous and non-interrupt mode for mailbox based
2877  * controllers. This is a faster version of the synchronous command and
2878  * therefore can be called in interrupt-context as well.
2879  */
2880 static int
2881 mbox_post_sync_cmd_fast(adapter_t *adapter, uint8_t raw_mbox[])
2882 {
2883         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
2884         mbox_t          *mbox;
2885         long            i;
2886 
2887 
2888         mbox    = raid_dev->mbox;
2889 
2890         // return immediately if the mailbox is busy
2891         if (mbox->busy) return -1;
2892 
2893         // Copy mailbox data into host structure
2894         memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 14);
2895         mbox->cmdid             = 0xFE;
2896         mbox->busy              = 1;
2897         mbox->poll              = 0;
2898         mbox->ack               = 0;
2899         mbox->numstatus         = 0xFF;
2900         mbox->status            = 0xFF;
2901 
2902         wmb();
2903         WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
2904 
2905         for (i = 0; i < MBOX_SYNC_WAIT_CNT; i++) {
2906                 if (mbox->numstatus != 0xFF) break;
2907                 rmb();
2908                 udelay(MBOX_SYNC_DELAY_200);
2909         }
2910 
2911         if (i == MBOX_SYNC_WAIT_CNT) {
2912                 // We may need to re-calibrate the counter
2913                 con_log(CL_ANN, (KERN_CRIT
2914                         "megaraid: fast sync command timed out\n"));
2915         }
2916 
2917         WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x2);
2918         wmb();
2919 
2920         return mbox->status;
2921 }
2922 
2923 
2924 /**
2925  * megaraid_busywait_mbox() - Wait until the controller's mailbox is available
2926  * @raid_dev    : RAID device (HBA) soft state
2927  *
2928  * Wait until the controller's mailbox is available to accept more commands.
2929  * Wait for at most 1 second.
2930  */
2931 static int
2932 megaraid_busywait_mbox(mraid_device_t *raid_dev)
2933 {
2934         mbox_t  *mbox = raid_dev->mbox;
2935         int     i = 0;
2936 
2937         if (mbox->busy) {
2938                 udelay(25);
2939                 for (i = 0; mbox->busy && i < 1000; i++)
2940                         msleep(1);
2941         }
2942 
2943         if (i < 1000) return 0;
2944         else return -1;
2945 }
2946 
2947 
2948 /**
2949  * megaraid_mbox_product_info - some static information about the controller
2950  * @adapter     : our soft state
2951  *
2952  * Issue commands to the controller to grab some parameters required by our
2953  * caller.
2954  */
2955 static int
2956 megaraid_mbox_product_info(adapter_t *adapter)
2957 {
2958         mraid_device_t          *raid_dev = ADAP2RAIDDEV(adapter);
2959         mbox_t                  *mbox;
2960         uint8_t                 raw_mbox[sizeof(mbox_t)];
2961         mraid_pinfo_t           *pinfo;
2962         dma_addr_t              pinfo_dma_h;
2963         mraid_inquiry3_t        *mraid_inq3;
2964         int                     i;
2965 
2966 
2967         memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
2968         mbox = (mbox_t *)raw_mbox;
2969 
2970         /*
2971          * Issue an ENQUIRY3 command to find out certain adapter parameters,
2972          * e.g., max channels, max commands etc.
2973          */
2974         pinfo = pci_zalloc_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
2975                                       &pinfo_dma_h);
2976 
2977         if (pinfo == NULL) {
2978                 con_log(CL_ANN, (KERN_WARNING
2979                         "megaraid: out of memory, %s %d\n", __func__,
2980                         __LINE__));
2981 
2982                 return -1;
2983         }
2984 
2985         mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
2986         memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
2987 
2988         raw_mbox[0] = FC_NEW_CONFIG;
2989         raw_mbox[2] = NC_SUBOP_ENQUIRY3;
2990         raw_mbox[3] = ENQ3_GET_SOLICITED_FULL;
2991 
2992         // Issue the command
2993         if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
2994 
2995                 con_log(CL_ANN, (KERN_WARNING "megaraid: Inquiry3 failed\n"));
2996 
2997                 pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
2998                         pinfo, pinfo_dma_h);
2999 
3000                 return -1;
3001         }
3002 
3003         /*
3004          * Collect information about state of each physical drive
3005          * attached to the controller. We will expose all the disks
3006          * which are not part of RAID
3007          */
3008         mraid_inq3 = (mraid_inquiry3_t *)adapter->ibuf;
3009         for (i = 0; i < MBOX_MAX_PHYSICAL_DRIVES; i++) {
3010                 raid_dev->pdrv_state[i] = mraid_inq3->pdrv_state[i];
3011         }
3012 
3013         /*
3014          * Get product info for information like number of channels,
3015          * maximum commands supported.
3016          */
3017         memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
3018         mbox->xferaddr = (uint32_t)pinfo_dma_h;
3019 
3020         raw_mbox[0] = FC_NEW_CONFIG;
3021         raw_mbox[2] = NC_SUBOP_PRODUCT_INFO;
3022 
3023         if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
3024 
3025                 con_log(CL_ANN, (KERN_WARNING
3026                         "megaraid: product info failed\n"));
3027 
3028                 pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
3029                         pinfo, pinfo_dma_h);
3030 
3031                 return -1;
3032         }
3033 
3034         /*
3035          * Setup some parameters for host, as required by our caller
3036          */
3037         adapter->max_channel = pinfo->nchannels;
3038 
3039         /*
3040          * we will export all the logical drives on a single channel.
3041          * Add 1 since inquires do not come for inititor ID
3042          */
3043         adapter->max_target     = MAX_LOGICAL_DRIVES_40LD + 1;
3044         adapter->max_lun        = 8;    // up to 8 LUNs for non-disk devices
3045 
3046         /*
3047          * These are the maximum outstanding commands for the scsi-layer
3048          */
3049         adapter->max_cmds       = MBOX_MAX_SCSI_CMDS;
3050 
3051         memset(adapter->fw_version, 0, VERSION_SIZE);
3052         memset(adapter->bios_version, 0, VERSION_SIZE);
3053 
3054         memcpy(adapter->fw_version, pinfo->fw_version, 4);
3055         adapter->fw_version[4] = 0;
3056 
3057         memcpy(adapter->bios_version, pinfo->bios_version, 4);
3058         adapter->bios_version[4] = 0;
3059 
3060         con_log(CL_ANN, (KERN_NOTICE
3061                 "megaraid: fw version:[%s] bios version:[%s]\n",
3062                 adapter->fw_version, adapter->bios_version));
3063 
3064         pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t), pinfo,
3065                         pinfo_dma_h);
3066 
3067         return 0;
3068 }
3069 
3070 
3071 
3072 /**
3073  * megaraid_mbox_extended_cdb - check for support for extended CDBs
3074  * @adapter     : soft state for the controller
3075  *
3076  * This routine check whether the controller in question supports extended
3077  * ( > 10 bytes ) CDBs.
3078  */
3079 static int
3080 megaraid_mbox_extended_cdb(adapter_t *adapter)
3081 {
3082         mbox_t          *mbox;
3083         uint8_t         raw_mbox[sizeof(mbox_t)];
3084         int             rval;
3085 
3086         mbox = (mbox_t *)raw_mbox;
3087 
3088         memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
3089         mbox->xferaddr  = (uint32_t)adapter->ibuf_dma_h;
3090 
3091         memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
3092 
3093         raw_mbox[0] = MAIN_MISC_OPCODE;
3094         raw_mbox[2] = SUPPORT_EXT_CDB;
3095 
3096         /*
3097          * Issue the command
3098          */
3099         rval = 0;
3100         if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
3101                 rval = -1;
3102         }
3103 
3104         return rval;
3105 }
3106 
3107 
3108 /**
3109  * megaraid_mbox_support_ha - Do we support clustering
3110  * @adapter     : soft state for the controller
3111  * @init_id     : ID of the initiator
3112  *
3113  * Determine if the firmware supports clustering and the ID of the initiator.
3114  */
3115 static int
3116 megaraid_mbox_support_ha(adapter_t *adapter, uint16_t *init_id)
3117 {
3118         mbox_t          *mbox;
3119         uint8_t         raw_mbox[sizeof(mbox_t)];
3120         int             rval;
3121 
3122 
3123         mbox = (mbox_t *)raw_mbox;
3124 
3125         memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
3126 
3127         mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
3128 
3129         memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
3130 
3131         raw_mbox[0] = GET_TARGET_ID;
3132 
3133         // Issue the command
3134         *init_id = 7;
3135         rval =  -1;
3136         if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
3137 
3138                 *init_id = *(uint8_t *)adapter->ibuf;
3139 
3140                 con_log(CL_ANN, (KERN_INFO
3141                         "megaraid: cluster firmware, initiator ID: %d\n",
3142                         *init_id));
3143 
3144                 rval =  0;
3145         }
3146 
3147         return rval;
3148 }
3149 
3150 
3151 /**
3152  * megaraid_mbox_support_random_del - Do we support random deletion
3153  * @adapter     : soft state for the controller
3154  *
3155  * Determine if the firmware supports random deletion.
3156  * Return:      1 is operation supported, 0 otherwise
3157  */
3158 static int
3159 megaraid_mbox_support_random_del(adapter_t *adapter)
3160 {
3161         mbox_t          *mbox;
3162         uint8_t         raw_mbox[sizeof(mbox_t)];
3163         int             rval;
3164 
3165         /*
3166          * Newer firmware on Dell CERC expect a different
3167          * random deletion handling, so disable it.
3168          */
3169         if (adapter->pdev->vendor == PCI_VENDOR_ID_AMI &&
3170             adapter->pdev->device == PCI_DEVICE_ID_AMI_MEGARAID3 &&
3171             adapter->pdev->subsystem_vendor == PCI_VENDOR_ID_DELL &&
3172             adapter->pdev->subsystem_device == PCI_SUBSYS_ID_CERC_ATA100_4CH &&
3173             (adapter->fw_version[0] > '6' ||
3174              (adapter->fw_version[0] == '6' &&
3175               adapter->fw_version[2] > '6') ||
3176              (adapter->fw_version[0] == '6'
3177               && adapter->fw_version[2] == '6'
3178               && adapter->fw_version[3] > '1'))) {
3179                 con_log(CL_DLEVEL1, ("megaraid: disable random deletion\n"));
3180                 return 0;
3181         }
3182 
3183         mbox = (mbox_t *)raw_mbox;
3184 
3185         memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
3186 
3187         raw_mbox[0] = FC_DEL_LOGDRV;
3188         raw_mbox[2] = OP_SUP_DEL_LOGDRV;
3189 
3190         // Issue the command
3191         rval = 0;
3192         if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
3193 
3194                 con_log(CL_DLEVEL1, ("megaraid: supports random deletion\n"));
3195 
3196                 rval =  1;
3197         }
3198 
3199         return rval;
3200 }
3201 
3202 
3203 /**
3204  * megaraid_mbox_get_max_sg - maximum sg elements supported by the firmware
3205  * @adapter     : soft state for the controller
3206  *
3207  * Find out the maximum number of scatter-gather elements supported by the
3208  * firmware.
3209  */
3210 static int
3211 megaraid_mbox_get_max_sg(adapter_t *adapter)
3212 {
3213         mbox_t          *mbox;
3214         uint8_t         raw_mbox[sizeof(mbox_t)];
3215         int             nsg;
3216 
3217 
3218         mbox = (mbox_t *)raw_mbox;
3219 
3220         memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
3221 
3222         mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
3223 
3224         memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
3225 
3226         raw_mbox[0] = MAIN_MISC_OPCODE;
3227         raw_mbox[2] = GET_MAX_SG_SUPPORT;
3228 
3229         // Issue the command
3230         if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
3231                 nsg =  *(uint8_t *)adapter->ibuf;
3232         }
3233         else {
3234                 nsg =  MBOX_DEFAULT_SG_SIZE;
3235         }
3236 
3237         if (nsg > MBOX_MAX_SG_SIZE) nsg = MBOX_MAX_SG_SIZE;
3238 
3239         return nsg;
3240 }
3241 
3242 
3243 /**
3244  * megaraid_mbox_enum_raid_scsi - enumerate the RAID and SCSI channels
3245  * @adapter     : soft state for the controller
3246  *
3247  * Enumerate the RAID and SCSI channels for ROMB platforms so that channels
3248  * can be exported as regular SCSI channels.
3249  */
3250 static void
3251 megaraid_mbox_enum_raid_scsi(adapter_t *adapter)
3252 {
3253         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
3254         mbox_t          *mbox;
3255         uint8_t         raw_mbox[sizeof(mbox_t)];
3256 
3257 
3258         mbox = (mbox_t *)raw_mbox;
3259 
3260         memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
3261 
3262         mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
3263 
3264         memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
3265 
3266         raw_mbox[0] = CHNL_CLASS;
3267         raw_mbox[2] = GET_CHNL_CLASS;
3268 
3269         // Issue the command. If the command fails, all channels are RAID
3270         // channels
3271         raid_dev->channel_class = 0xFF;
3272         if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
3273                 raid_dev->channel_class =  *(uint8_t *)adapter->ibuf;
3274         }
3275 
3276         return;
3277 }
3278 
3279 
3280 /**
3281  * megaraid_mbox_flush_cache - flush adapter and disks cache
3282  * @adapter             : soft state for the controller
3283  *
3284  * Flush adapter cache followed by disks cache.
3285  */
3286 static void
3287 megaraid_mbox_flush_cache(adapter_t *adapter)
3288 {
3289         mbox_t  *mbox;
3290         uint8_t raw_mbox[sizeof(mbox_t)];
3291 
3292 
3293         mbox = (mbox_t *)raw_mbox;
3294 
3295         memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
3296 
3297         raw_mbox[0] = FLUSH_ADAPTER;
3298 
3299         if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
3300                 con_log(CL_ANN, ("megaraid: flush adapter failed\n"));
3301         }
3302 
3303         raw_mbox[0] = FLUSH_SYSTEM;
3304 
3305         if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
3306                 con_log(CL_ANN, ("megaraid: flush disks cache failed\n"));
3307         }
3308 
3309         return;
3310 }
3311 
3312 
3313 /**
3314  * megaraid_mbox_fire_sync_cmd - fire the sync cmd
3315  * @adapter             : soft state for the controller
3316  *
3317  * Clears the pending cmds in FW and reinits its RAID structs.
3318  */
3319 static int
3320 megaraid_mbox_fire_sync_cmd(adapter_t *adapter)
3321 {
3322         mbox_t  *mbox;
3323         uint8_t raw_mbox[sizeof(mbox_t)];
3324         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
3325         mbox64_t *mbox64;
3326         int     status = 0;
3327         int i;
3328         uint32_t dword;
3329 
3330         mbox = (mbox_t *)raw_mbox;
3331 
3332         memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
3333 
3334         raw_mbox[0] = 0xFF;
3335 
3336         mbox64  = raid_dev->mbox64;
3337         mbox    = raid_dev->mbox;
3338 
3339         /* Wait until mailbox is free */
3340         if (megaraid_busywait_mbox(raid_dev) != 0) {
3341                 status = 1;
3342                 goto blocked_mailbox;
3343         }
3344 
3345         /* Copy mailbox data into host structure */
3346         memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 16);
3347         mbox->cmdid             = 0xFE;
3348         mbox->busy              = 1;
3349         mbox->poll              = 0;
3350         mbox->ack               = 0;
3351         mbox->numstatus         = 0;
3352         mbox->status            = 0;
3353 
3354         wmb();
3355         WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
3356 
3357         /* Wait for maximum 1 min for status to post.
3358          * If the Firmware SUPPORTS the ABOVE COMMAND,
3359          * mbox->cmd will be set to 0
3360          * else
3361          * the firmware will reject the command with
3362          * mbox->numstatus set to 1
3363          */
3364 
3365         i = 0;
3366         status = 0;
3367         while (!mbox->numstatus && mbox->cmd == 0xFF) {
3368                 rmb();
3369                 msleep(1);
3370                 i++;
3371                 if (i > 1000 * 60) {
3372                         status = 1;
3373                         break;
3374                 }
3375         }
3376         if (mbox->numstatus == 1)
3377                 status = 1; /*cmd not supported*/
3378 
3379         /* Check for interrupt line */
3380         dword = RDOUTDOOR(raid_dev);
3381         WROUTDOOR(raid_dev, dword);
3382         WRINDOOR(raid_dev,2);
3383 
3384         return status;
3385 
3386 blocked_mailbox:
3387         con_log(CL_ANN, (KERN_WARNING "megaraid: blocked mailbox\n"));
3388         return status;
3389 }
3390 
3391 /**
3392  * megaraid_mbox_display_scb - display SCB information, mostly debug purposes
3393  * @adapter             : controller's soft state
3394  * @scb                 : SCB to be displayed
3395  * @level               : debug level for console print
3396  *
3397  * Diplay information about the given SCB iff the current debug level is
3398  * verbose.
3399  */
3400 static void
3401 megaraid_mbox_display_scb(adapter_t *adapter, scb_t *scb)
3402 {
3403         mbox_ccb_t              *ccb;
3404         struct scsi_cmnd        *scp;
3405         mbox_t                  *mbox;
3406         int                     level;
3407         int                     i;
3408 
3409 
3410         ccb     = (mbox_ccb_t *)scb->ccb;
3411         scp     = scb->scp;
3412         mbox    = ccb->mbox;
3413 
3414         level = CL_DLEVEL3;
3415 
3416         con_log(level, (KERN_NOTICE
3417                 "megaraid mailbox: status:%#x cmd:%#x id:%#x ", scb->status,
3418                 mbox->cmd, scb->sno));
3419 
3420         con_log(level, ("sec:%#x lba:%#x addr:%#x ld:%d sg:%d\n",
3421                 mbox->numsectors, mbox->lba, mbox->xferaddr, mbox->logdrv,
3422                 mbox->numsge));
3423 
3424         if (!scp) return;
3425 
3426         con_log(level, (KERN_NOTICE "scsi cmnd: "));
3427 
3428         for (i = 0; i < scp->cmd_len; i++) {
3429                 con_log(level, ("%#2.02x ", scp->cmnd[i]));
3430         }
3431 
3432         con_log(level, ("\n"));
3433 
3434         return;
3435 }
3436 
3437 
3438 /**
3439  * megaraid_mbox_setup_device_map - manage device ids
3440  * @adapter     : Driver's soft state
3441  *
3442  * Manage the device ids to have an appropriate mapping between the kernel
3443  * scsi addresses and megaraid scsi and logical drive addresses. We export
3444  * scsi devices on their actual addresses, whereas the logical drives are
3445  * exported on a virtual scsi channel.
3446  */
3447 static void
3448 megaraid_mbox_setup_device_map(adapter_t *adapter)
3449 {
3450         uint8_t         c;
3451         uint8_t         t;
3452 
3453         /*
3454          * First fill the values on the logical drive channel
3455          */
3456         for (t = 0; t < LSI_MAX_LOGICAL_DRIVES_64LD; t++)
3457                 adapter->device_ids[adapter->max_channel][t] =
3458                         (t < adapter->init_id) ?  t : t - 1;
3459 
3460         adapter->device_ids[adapter->max_channel][adapter->init_id] = 0xFF;
3461 
3462         /*
3463          * Fill the values on the physical devices channels
3464          */
3465         for (c = 0; c < adapter->max_channel; c++)
3466                 for (t = 0; t < LSI_MAX_LOGICAL_DRIVES_64LD; t++)
3467                         adapter->device_ids[c][t] = (c << 8) | t;
3468 }
3469 
3470 
3471 /*
3472  * END: internal commands library
3473  */
3474 
3475 /*
3476  * START: Interface for the common management module
3477  *
3478  * This is the module, which interfaces with the common management module to
3479  * provide support for ioctl and sysfs
3480  */
3481 
3482 /**
3483  * megaraid_cmm_register - register with the management module
3484  * @adapter             : HBA soft state
3485  *
3486  * Register with the management module, which allows applications to issue
3487  * ioctl calls to the drivers. This interface is used by the management module
3488  * to setup sysfs support as well.
3489  */
3490 static int
3491 megaraid_cmm_register(adapter_t *adapter)
3492 {
3493         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
3494         mraid_mmadp_t   adp;
3495         scb_t           *scb;
3496         mbox_ccb_t      *ccb;
3497         int             rval;
3498         int             i;
3499 
3500         // Allocate memory for the base list of scb for management module.
3501         adapter->uscb_list = kcalloc(MBOX_MAX_USER_CMDS, sizeof(scb_t), GFP_KERNEL);
3502 
3503         if (adapter->uscb_list == NULL) {
3504                 con_log(CL_ANN, (KERN_WARNING
3505                         "megaraid: out of memory, %s %d\n", __func__,
3506                         __LINE__));
3507                 return -1;
3508         }
3509 
3510 
3511         // Initialize the synchronization parameters for resources for
3512         // commands for management module
3513         INIT_LIST_HEAD(&adapter->uscb_pool);
3514 
3515         spin_lock_init(USER_FREE_LIST_LOCK(adapter));
3516 
3517 
3518 
3519         // link all the packets. Note, CCB for commands, coming from the
3520         // commom management module, mailbox physical address are already
3521         // setup by it. We just need placeholder for that in our local command
3522         // control blocks
3523         for (i = 0; i < MBOX_MAX_USER_CMDS; i++) {
3524 
3525                 scb                     = adapter->uscb_list + i;
3526                 ccb                     = raid_dev->uccb_list + i;
3527 
3528                 scb->ccb                = (caddr_t)ccb;
3529                 ccb->mbox64             = raid_dev->umbox64 + i;
3530                 ccb->mbox               = &ccb->mbox64->mbox32;
3531                 ccb->raw_mbox           = (uint8_t *)ccb->mbox;
3532 
3533                 scb->gp                 = 0;
3534 
3535                 // COMMAND ID 0 - (MBOX_MAX_SCSI_CMDS-1) ARE RESERVED FOR
3536                 // COMMANDS COMING FROM IO SUBSYSTEM (MID-LAYER)
3537                 scb->sno                = i + MBOX_MAX_SCSI_CMDS;
3538 
3539                 scb->scp                = NULL;
3540                 scb->state              = SCB_FREE;
3541                 scb->dma_direction      = PCI_DMA_NONE;
3542                 scb->dma_type           = MRAID_DMA_NONE;
3543                 scb->dev_channel        = -1;
3544                 scb->dev_target         = -1;
3545 
3546                 // put scb in the free pool
3547                 list_add_tail(&scb->list, &adapter->uscb_pool);
3548         }
3549 
3550         adp.unique_id           = adapter->unique_id;
3551         adp.drvr_type           = DRVRTYPE_MBOX;
3552         adp.drvr_data           = (unsigned long)adapter;
3553         adp.pdev                = adapter->pdev;
3554         adp.issue_uioc          = megaraid_mbox_mm_handler;
3555         adp.timeout             = MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT;
3556         adp.max_kioc            = MBOX_MAX_USER_CMDS;
3557 
3558         if ((rval = mraid_mm_register_adp(&adp)) != 0) {
3559 
3560                 con_log(CL_ANN, (KERN_WARNING
3561                         "megaraid mbox: did not register with CMM\n"));
3562 
3563                 kfree(adapter->uscb_list);
3564         }
3565 
3566         return rval;
3567 }
3568 
3569 
3570 /**
3571  * megaraid_cmm_unregister - un-register with the management module
3572  * @adapter             : HBA soft state
3573  *
3574  * Un-register with the management module.
3575  * FIXME: mgmt module must return failure for unregister if it has pending
3576  * commands in LLD.
3577  */
3578 static int
3579 megaraid_cmm_unregister(adapter_t *adapter)
3580 {
3581         kfree(adapter->uscb_list);
3582         mraid_mm_unregister_adp(adapter->unique_id);
3583         return 0;
3584 }
3585 
3586 
3587 /**
3588  * megaraid_mbox_mm_handler - interface for CMM to issue commands to LLD
3589  * @drvr_data           : LLD specific data
3590  * @kioc                : CMM interface packet
3591  * @action              : command action
3592  *
3593  * This routine is invoked whenever the Common Management Module (CMM) has a
3594  * command for us. The 'action' parameter specifies if this is a new command
3595  * or otherwise.
3596  */
3597 static int
3598 megaraid_mbox_mm_handler(unsigned long drvr_data, uioc_t *kioc, uint32_t action)
3599 {
3600         adapter_t *adapter;
3601 
3602         if (action != IOCTL_ISSUE) {
3603                 con_log(CL_ANN, (KERN_WARNING
3604                         "megaraid: unsupported management action:%#2x\n",
3605                         action));
3606                 return (-ENOTSUPP);
3607         }
3608 
3609         adapter = (adapter_t *)drvr_data;
3610 
3611         // make sure this adapter is not being detached right now.
3612         if (atomic_read(&adapter->being_detached)) {
3613                 con_log(CL_ANN, (KERN_WARNING
3614                         "megaraid: reject management request, detaching\n"));
3615                 return (-ENODEV);
3616         }
3617 
3618         switch (kioc->opcode) {
3619 
3620         case GET_ADAP_INFO:
3621 
3622                 kioc->status =  gather_hbainfo(adapter, (mraid_hba_info_t *)
3623                                         (unsigned long)kioc->buf_vaddr);
3624 
3625                 kioc->done(kioc);
3626 
3627                 return kioc->status;
3628 
3629         case MBOX_CMD:
3630 
3631                 return megaraid_mbox_mm_command(adapter, kioc);
3632 
3633         default:
3634                 kioc->status = (-EINVAL);
3635                 kioc->done(kioc);
3636                 return (-EINVAL);
3637         }
3638 
3639         return 0;       // not reached
3640 }
3641 
3642 /**
3643  * megaraid_mbox_mm_command - issues commands routed through CMM
3644  * @adapter             : HBA soft state
3645  * @kioc                : management command packet
3646  *
3647  * Issues commands, which are routed through the management module.
3648  */
3649 static int
3650 megaraid_mbox_mm_command(adapter_t *adapter, uioc_t *kioc)
3651 {
3652         struct list_head        *head = &adapter->uscb_pool;
3653         mbox64_t                *mbox64;
3654         uint8_t                 *raw_mbox;
3655         scb_t                   *scb;
3656         mbox_ccb_t              *ccb;
3657         unsigned long           flags;
3658 
3659         // detach one scb from free pool
3660         spin_lock_irqsave(USER_FREE_LIST_LOCK(adapter), flags);
3661 
3662         if (list_empty(head)) { // should never happen because of CMM
3663 
3664                 con_log(CL_ANN, (KERN_WARNING
3665                         "megaraid mbox: bug in cmm handler, lost resources\n"));
3666 
3667                 spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);
3668 
3669                 return (-EINVAL);
3670         }
3671 
3672         scb = list_entry(head->next, scb_t, list);
3673         list_del_init(&scb->list);
3674 
3675         spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);
3676 
3677         scb->state              = SCB_ACTIVE;
3678         scb->dma_type           = MRAID_DMA_NONE;
3679         scb->dma_direction      = PCI_DMA_NONE;
3680 
3681         ccb             = (mbox_ccb_t *)scb->ccb;
3682         mbox64          = (mbox64_t *)(unsigned long)kioc->cmdbuf;
3683         raw_mbox        = (uint8_t *)&mbox64->mbox32;
3684 
3685         memcpy(ccb->mbox64, mbox64, sizeof(mbox64_t));
3686 
3687         scb->gp         = (unsigned long)kioc;
3688 
3689         /*
3690          * If it is a logdrv random delete operation, we have to wait till
3691          * there are no outstanding cmds at the fw and then issue it directly
3692          */
3693         if (raw_mbox[0] == FC_DEL_LOGDRV && raw_mbox[2] == OP_DEL_LOGDRV) {
3694 
3695                 if (wait_till_fw_empty(adapter)) {
3696                         con_log(CL_ANN, (KERN_NOTICE
3697                                 "megaraid mbox: LD delete, timed out\n"));
3698 
3699                         kioc->status = -ETIME;
3700 
3701                         scb->status = -1;
3702 
3703                         megaraid_mbox_mm_done(adapter, scb);
3704 
3705                         return (-ETIME);
3706                 }
3707 
3708                 INIT_LIST_HEAD(&scb->list);
3709 
3710                 scb->state = SCB_ISSUED;
3711                 if (mbox_post_cmd(adapter, scb) != 0) {
3712 
3713                         con_log(CL_ANN, (KERN_NOTICE
3714                                 "megaraid mbox: LD delete, mailbox busy\n"));
3715 
3716                         kioc->status = -EBUSY;
3717 
3718                         scb->status = -1;
3719 
3720                         megaraid_mbox_mm_done(adapter, scb);
3721 
3722                         return (-EBUSY);
3723                 }
3724 
3725                 return 0;
3726         }
3727 
3728         // put the command on the pending list and execute
3729         megaraid_mbox_runpendq(adapter, scb);
3730 
3731         return 0;
3732 }
3733 
3734 
3735 static int
3736 wait_till_fw_empty(adapter_t *adapter)
3737 {
3738         unsigned long   flags = 0;
3739         int             i;
3740 
3741 
3742         /*
3743          * Set the quiescent flag to stop issuing cmds to FW.
3744          */
3745         spin_lock_irqsave(&adapter->lock, flags);
3746         adapter->quiescent++;
3747         spin_unlock_irqrestore(&adapter->lock, flags);
3748 
3749         /*
3750          * Wait till there are no more cmds outstanding at FW. Try for at most
3751          * 60 seconds
3752          */
3753         for (i = 0; i < 60 && adapter->outstanding_cmds; i++) {
3754                 con_log(CL_DLEVEL1, (KERN_INFO
3755                         "megaraid: FW has %d pending commands\n",
3756                         adapter->outstanding_cmds));
3757 
3758                 msleep(1000);
3759         }
3760 
3761         return adapter->outstanding_cmds;
3762 }
3763 
3764 
3765 /**
3766  * megaraid_mbox_mm_done - callback for CMM commands
3767  * @adapter     : HBA soft state
3768  * @scb         : completed command
3769  *
3770  * Callback routine for internal commands originated from the management
3771  * module.
3772  */
3773 static void
3774 megaraid_mbox_mm_done(adapter_t *adapter, scb_t *scb)
3775 {
3776         uioc_t                  *kioc;
3777         mbox64_t                *mbox64;
3778         uint8_t                 *raw_mbox;
3779         unsigned long           flags;
3780 
3781         kioc                    = (uioc_t *)scb->gp;
3782         mbox64                  = (mbox64_t *)(unsigned long)kioc->cmdbuf;
3783         mbox64->mbox32.status   = scb->status;
3784         raw_mbox                = (uint8_t *)&mbox64->mbox32;
3785 
3786 
3787         // put scb in the free pool
3788         scb->state      = SCB_FREE;
3789         scb->scp        = NULL;
3790 
3791         spin_lock_irqsave(USER_FREE_LIST_LOCK(adapter), flags);
3792 
3793         list_add(&scb->list, &adapter->uscb_pool);
3794 
3795         spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);
3796 
3797         // if a delete logical drive operation succeeded, restart the
3798         // controller
3799         if (raw_mbox[0] == FC_DEL_LOGDRV && raw_mbox[2] == OP_DEL_LOGDRV) {
3800 
3801                 adapter->quiescent--;
3802 
3803                 megaraid_mbox_runpendq(adapter, NULL);
3804         }
3805 
3806         kioc->done(kioc);
3807 
3808         return;
3809 }
3810 
3811 
3812 /**
3813  * gather_hbainfo - HBA characteristics for the applications
3814  * @adapter             : HBA soft state
3815  * @hinfo               : pointer to the caller's host info strucuture
3816  */
3817 static int
3818 gather_hbainfo(adapter_t *adapter, mraid_hba_info_t *hinfo)
3819 {
3820         uint8_t dmajor;
3821 
3822         dmajor                  = megaraid_mbox_version[0];
3823 
3824         hinfo->pci_vendor_id    = adapter->pdev->vendor;
3825         hinfo->pci_device_id    = adapter->pdev->device;
3826         hinfo->subsys_vendor_id = adapter->pdev->subsystem_vendor;
3827         hinfo->subsys_device_id = adapter->pdev->subsystem_device;
3828 
3829         hinfo->pci_bus          = adapter->pdev->bus->number;
3830         hinfo->pci_dev_fn       = adapter->pdev->devfn;
3831         hinfo->pci_slot         = PCI_SLOT(adapter->pdev->devfn);
3832         hinfo->irq              = adapter->host->irq;
3833         hinfo->baseport         = ADAP2RAIDDEV(adapter)->baseport;
3834 
3835         hinfo->unique_id        = (hinfo->pci_bus << 8) | adapter->pdev->devfn;
3836         hinfo->host_no          = adapter->host->host_no;
3837 
3838         return 0;
3839 }
3840 
3841 /*
3842  * END: Interface for the common management module
3843  */
3844 
3845 
3846 
3847 /**
3848  * megaraid_sysfs_alloc_resources - allocate sysfs related resources
3849  * @adapter     : controller's soft state
3850  *
3851  * Allocate packets required to issue FW calls whenever the sysfs attributes
3852  * are read. These attributes would require up-to-date information from the
3853  * FW. Also set up resources for mutual exclusion to share these resources and
3854  * the wait queue.
3855  *
3856  * Return 0 on success.
3857  * Return -ERROR_CODE on failure.
3858  */
3859 static int
3860 megaraid_sysfs_alloc_resources(adapter_t *adapter)
3861 {
3862         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
3863         int             rval = 0;
3864 
3865         raid_dev->sysfs_uioc = kmalloc(sizeof(uioc_t), GFP_KERNEL);
3866 
3867         raid_dev->sysfs_mbox64 = kmalloc(sizeof(mbox64_t), GFP_KERNEL);
3868 
3869         raid_dev->sysfs_buffer = pci_alloc_consistent(adapter->pdev,
3870                         PAGE_SIZE, &raid_dev->sysfs_buffer_dma);
3871 
3872         if (!raid_dev->sysfs_uioc || !raid_dev->sysfs_mbox64 ||
3873                 !raid_dev->sysfs_buffer) {
3874 
3875                 con_log(CL_ANN, (KERN_WARNING
3876                         "megaraid: out of memory, %s %d\n", __func__,
3877                         __LINE__));
3878 
3879                 rval = -ENOMEM;
3880 
3881                 megaraid_sysfs_free_resources(adapter);
3882         }
3883 
3884         mutex_init(&raid_dev->sysfs_mtx);
3885 
3886         init_waitqueue_head(&raid_dev->sysfs_wait_q);
3887 
3888         return rval;
3889 }
3890 
3891 
3892 /**
3893  * megaraid_sysfs_free_resources - free sysfs related resources
3894  * @adapter     : controller's soft state
3895  *
3896  * Free packets allocated for sysfs FW commands
3897  */
3898 static void
3899 megaraid_sysfs_free_resources(adapter_t *adapter)
3900 {
3901         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
3902 
3903         kfree(raid_dev->sysfs_uioc);
3904         kfree(raid_dev->sysfs_mbox64);
3905 
3906         if (raid_dev->sysfs_buffer) {
3907                 pci_free_consistent(adapter->pdev, PAGE_SIZE,
3908                         raid_dev->sysfs_buffer, raid_dev->sysfs_buffer_dma);
3909         }
3910 }
3911 
3912 
3913 /**
3914  * megaraid_sysfs_get_ldmap_done - callback for get ldmap
3915  * @uioc        : completed packet
3916  *
3917  * Callback routine called in the ISR/tasklet context for get ldmap call
3918  */
3919 static void
3920 megaraid_sysfs_get_ldmap_done(uioc_t *uioc)
3921 {
3922         adapter_t       *adapter = (adapter_t *)uioc->buf_vaddr;
3923         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
3924 
3925         uioc->status = 0;
3926 
3927         wake_up(&raid_dev->sysfs_wait_q);
3928 }
3929 
3930 
3931 /**
3932  * megaraid_sysfs_get_ldmap_timeout - timeout handling for get ldmap
3933  * @data        : timed out packet
3934  *
3935  * Timeout routine to recover and return to application, in case the adapter
3936  * has stopped responding. A timeout of 60 seconds for this command seems like
3937  * a good value.
3938  */
3939 static void
3940 megaraid_sysfs_get_ldmap_timeout(unsigned long data)
3941 {
3942         uioc_t          *uioc = (uioc_t *)data;
3943         adapter_t       *adapter = (adapter_t *)uioc->buf_vaddr;
3944         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
3945 
3946         uioc->status = -ETIME;
3947 
3948         wake_up(&raid_dev->sysfs_wait_q);
3949 }
3950 
3951 
3952 /**
3953  * megaraid_sysfs_get_ldmap - get update logical drive map
3954  * @adapter     : controller's soft state
3955  *
3956  * This routine will be called whenever user reads the logical drive
3957  * attributes, go get the current logical drive mapping table from the
3958  * firmware. We use the management API's to issue commands to the controller.
3959  *
3960  * NOTE: The commands issuance functionality is not generalized and
3961  * implemented in context of "get ld map" command only. If required, the
3962  * command issuance logical can be trivially pulled out and implemented as a
3963  * standalone library. For now, this should suffice since there is no other
3964  * user of this interface.
3965  *
3966  * Return 0 on success.
3967  * Return -1 on failure.
3968  */
3969 static int
3970 megaraid_sysfs_get_ldmap(adapter_t *adapter)
3971 {
3972         mraid_device_t          *raid_dev = ADAP2RAIDDEV(adapter);
3973         uioc_t                  *uioc;
3974         mbox64_t                *mbox64;
3975         mbox_t                  *mbox;
3976         char                    *raw_mbox;
3977         struct timer_list       sysfs_timer;
3978         struct timer_list       *timerp;
3979         caddr_t                 ldmap;
3980         int                     rval = 0;
3981 
3982         /*
3983          * Allow only one read at a time to go through the sysfs attributes
3984          */
3985         mutex_lock(&raid_dev->sysfs_mtx);
3986 
3987         uioc    = raid_dev->sysfs_uioc;
3988         mbox64  = raid_dev->sysfs_mbox64;
3989         ldmap   = raid_dev->sysfs_buffer;
3990 
3991         memset(uioc, 0, sizeof(uioc_t));
3992         memset(mbox64, 0, sizeof(mbox64_t));
3993         memset(ldmap, 0, sizeof(raid_dev->curr_ldmap));
3994 
3995         mbox            = &mbox64->mbox32;
3996         raw_mbox        = (char *)mbox;
3997         uioc->cmdbuf    = (uint64_t)(unsigned long)mbox64;
3998         uioc->buf_vaddr = (caddr_t)adapter;
3999         uioc->status    = -ENODATA;
4000         uioc->done      = megaraid_sysfs_get_ldmap_done;
4001 
4002         /*
4003          * Prepare the mailbox packet to get the current logical drive mapping
4004          * table
4005          */
4006         mbox->xferaddr = (uint32_t)raid_dev->sysfs_buffer_dma;
4007 
4008         raw_mbox[0] = FC_DEL_LOGDRV;
4009         raw_mbox[2] = OP_GET_LDID_MAP;
4010 
4011         /*
4012          * Setup a timer to recover from a non-responding controller
4013          */
4014         timerp  = &sysfs_timer;
4015         init_timer(timerp);
4016 
4017         timerp->function        = megaraid_sysfs_get_ldmap_timeout;
4018         timerp->data            = (unsigned long)uioc;
4019         timerp->expires         = jiffies + 60 * HZ;
4020 
4021         add_timer(timerp);
4022 
4023         /*
4024          * Send the command to the firmware
4025          */
4026         rval = megaraid_mbox_mm_command(adapter, uioc);
4027 
4028         if (rval == 0) {        // command successfully issued
4029                 wait_event(raid_dev->sysfs_wait_q, (uioc->status != -ENODATA));
4030 
4031                 /*
4032                  * Check if the command timed out
4033                  */
4034                 if (uioc->status == -ETIME) {
4035                         con_log(CL_ANN, (KERN_NOTICE
4036                                 "megaraid: sysfs get ld map timed out\n"));
4037 
4038                         rval = -ETIME;
4039                 }
4040                 else {
4041                         rval = mbox->status;
4042                 }
4043 
4044                 if (rval == 0) {
4045                         memcpy(raid_dev->curr_ldmap, ldmap,
4046                                 sizeof(raid_dev->curr_ldmap));
4047                 }
4048                 else {
4049                         con_log(CL_ANN, (KERN_NOTICE
4050                                 "megaraid: get ld map failed with %x\n", rval));
4051                 }
4052         }
4053         else {
4054                 con_log(CL_ANN, (KERN_NOTICE
4055                         "megaraid: could not issue ldmap command:%x\n", rval));
4056         }
4057 
4058 
4059         del_timer_sync(timerp);
4060 
4061         mutex_unlock(&raid_dev->sysfs_mtx);
4062 
4063         return rval;
4064 }
4065 
4066 
4067 /**
4068  * megaraid_sysfs_show_app_hndl - display application handle for this adapter
4069  * @cdev        : class device object representation for the host
4070  * @buf         : buffer to send data to
4071  *
4072  * Display the handle used by the applications while executing management
4073  * tasks on the adapter. We invoke a management module API to get the adapter
4074  * handle, since we do not interface with applications directly.
4075  */
4076 static ssize_t
4077 megaraid_sysfs_show_app_hndl(struct device *dev, struct device_attribute *attr,
4078                              char *buf)
4079 {
4080         struct Scsi_Host *shost = class_to_shost(dev);
4081         adapter_t       *adapter = (adapter_t *)SCSIHOST2ADAP(shost);
4082         uint32_t        app_hndl;
4083 
4084         app_hndl = mraid_mm_adapter_app_handle(adapter->unique_id);
4085 
4086         return snprintf(buf, 8, "%u\n", app_hndl);
4087 }
4088 
4089 
4090 /**
4091  * megaraid_sysfs_show_ldnum - display the logical drive number for this device
4092  * @dev         : device object representation for the scsi device
4093  * @attr        : device attribute to show
4094  * @buf         : buffer to send data to
4095  *
4096  * Display the logical drive number for the device in question, if it a valid
4097  * logical drive. For physical devices, "-1" is returned.
4098  *
4099  * The logical drive number is displayed in following format:
4100  *
4101  * <SCSI ID> <LD NUM> <LD STICKY ID> <APP ADAPTER HANDLE>
4102  *
4103  *   <int>     <int>       <int>            <int>
4104  */
4105 static ssize_t
4106 megaraid_sysfs_show_ldnum(struct device *dev, struct device_attribute *attr, char *buf)
4107 {
4108         struct scsi_device *sdev = to_scsi_device(dev);
4109         adapter_t       *adapter = (adapter_t *)SCSIHOST2ADAP(sdev->host);
4110         mraid_device_t  *raid_dev = ADAP2RAIDDEV(adapter);
4111         int             scsi_id = -1;
4112         int             logical_drv = -1;
4113         int             ldid_map = -1;
4114         uint32_t        app_hndl = 0;
4115         int             mapped_sdev_id;
4116         int             rval;
4117         int             i;
4118 
4119         if (raid_dev->random_del_supported &&
4120                         MRAID_IS_LOGICAL_SDEV(adapter, sdev)) {
4121 
4122                 rval = megaraid_sysfs_get_ldmap(adapter);
4123                 if (rval == 0) {
4124 
4125                         for (i = 0; i < MAX_LOGICAL_DRIVES_40LD; i++) {
4126 
4127                                 mapped_sdev_id = sdev->id;
4128 
4129                                 if (sdev->id > adapter->init_id) {
4130                                         mapped_sdev_id -= 1;
4131                                 }
4132 
4133                                 if (raid_dev->curr_ldmap[i] == mapped_sdev_id) {
4134 
4135                                         scsi_id = sdev->id;
4136 
4137                                         logical_drv = i;
4138 
4139                                         ldid_map = raid_dev->curr_ldmap[i];
4140 
4141                                         app_hndl = mraid_mm_adapter_app_handle(
4142                                                         adapter->unique_id);
4143 
4144                                         break;
4145                                 }
4146                         }
4147                 }
4148                 else {
4149                         con_log(CL_ANN, (KERN_NOTICE
4150                                 "megaraid: sysfs get ld map failed: %x\n",
4151                                 rval));
4152                 }
4153         }
4154 
4155         return snprintf(buf, 36, "%d %d %d %d\n", scsi_id, logical_drv,
4156                         ldid_map, app_hndl);
4157 }
4158 
4159 
4160 /*
4161  * END: Mailbox Low Level Driver
4162  */
4163 module_init(megaraid_init);
4164 module_exit(megaraid_exit);
4165 
4166 /* vim: set ts=8 sw=8 tw=78 ai si: */
4167 

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