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Linux/drivers/scsi/ibmvscsi/ibmvscsi.c

  1 /* ------------------------------------------------------------
  2  * ibmvscsi.c
  3  * (C) Copyright IBM Corporation 1994, 2004
  4  * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
  5  *          Santiago Leon (santil@us.ibm.com)
  6  *          Dave Boutcher (sleddog@us.ibm.com)
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 21  * USA
 22  *
 23  * ------------------------------------------------------------
 24  * Emulation of a SCSI host adapter for Virtual I/O devices
 25  *
 26  * This driver supports the SCSI adapter implemented by the IBM
 27  * Power5 firmware.  That SCSI adapter is not a physical adapter,
 28  * but allows Linux SCSI peripheral drivers to directly
 29  * access devices in another logical partition on the physical system.
 30  *
 31  * The virtual adapter(s) are present in the open firmware device
 32  * tree just like real adapters.
 33  *
 34  * One of the capabilities provided on these systems is the ability
 35  * to DMA between partitions.  The architecture states that for VSCSI,
 36  * the server side is allowed to DMA to and from the client.  The client
 37  * is never trusted to DMA to or from the server directly.
 38  *
 39  * Messages are sent between partitions on a "Command/Response Queue" 
 40  * (CRQ), which is just a buffer of 16 byte entries in the receiver's 
 41  * Senders cannot access the buffer directly, but send messages by
 42  * making a hypervisor call and passing in the 16 bytes.  The hypervisor
 43  * puts the message in the next 16 byte space in round-robin fashion,
 44  * turns on the high order bit of the message (the valid bit), and 
 45  * generates an interrupt to the receiver (if interrupts are turned on.) 
 46  * The receiver just turns off the valid bit when they have copied out
 47  * the message.
 48  *
 49  * The VSCSI client builds a SCSI Remote Protocol (SRP) Information Unit
 50  * (IU) (as defined in the T10 standard available at www.t10.org), gets 
 51  * a DMA address for the message, and sends it to the server as the
 52  * payload of a CRQ message.  The server DMAs the SRP IU and processes it,
 53  * including doing any additional data transfers.  When it is done, it
 54  * DMAs the SRP response back to the same address as the request came from,
 55  * and sends a CRQ message back to inform the client that the request has
 56  * completed.
 57  *
 58  * TODO: This is currently pretty tied to the IBM pSeries hypervisor
 59  * interfaces.  It would be really nice to abstract this above an RDMA
 60  * layer.
 61  */
 62 
 63 #include <linux/module.h>
 64 #include <linux/moduleparam.h>
 65 #include <linux/dma-mapping.h>
 66 #include <linux/delay.h>
 67 #include <linux/slab.h>
 68 #include <linux/of.h>
 69 #include <linux/pm.h>
 70 #include <linux/kthread.h>
 71 #include <asm/firmware.h>
 72 #include <asm/vio.h>
 73 #include <scsi/scsi.h>
 74 #include <scsi/scsi_cmnd.h>
 75 #include <scsi/scsi_host.h>
 76 #include <scsi/scsi_device.h>
 77 #include <scsi/scsi_transport_srp.h>
 78 #include "ibmvscsi.h"
 79 
 80 /* The values below are somewhat arbitrary default values, but 
 81  * OS/400 will use 3 busses (disks, CDs, tapes, I think.)
 82  * Note that there are 3 bits of channel value, 6 bits of id, and
 83  * 5 bits of LUN.
 84  */
 85 static int max_id = 64;
 86 static int max_channel = 3;
 87 static int init_timeout = 300;
 88 static int login_timeout = 60;
 89 static int info_timeout = 30;
 90 static int abort_timeout = 60;
 91 static int reset_timeout = 60;
 92 static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
 93 static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
 94 static int fast_fail = 1;
 95 static int client_reserve = 1;
 96 static char partition_name[97] = "UNKNOWN";
 97 static unsigned int partition_number = -1;
 98 static LIST_HEAD(ibmvscsi_head);
 99 
100 static struct scsi_transport_template *ibmvscsi_transport_template;
101 
102 #define IBMVSCSI_VERSION "1.5.9"
103 
104 MODULE_DESCRIPTION("IBM Virtual SCSI");
105 MODULE_AUTHOR("Dave Boutcher");
106 MODULE_LICENSE("GPL");
107 MODULE_VERSION(IBMVSCSI_VERSION);
108 
109 module_param_named(max_id, max_id, int, S_IRUGO | S_IWUSR);
110 MODULE_PARM_DESC(max_id, "Largest ID value for each channel [Default=64]");
111 module_param_named(max_channel, max_channel, int, S_IRUGO | S_IWUSR);
112 MODULE_PARM_DESC(max_channel, "Largest channel value [Default=3]");
113 module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
114 MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
115 module_param_named(max_requests, max_requests, int, S_IRUGO);
116 MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
117 module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
118 MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
119 module_param_named(client_reserve, client_reserve, int, S_IRUGO );
120 MODULE_PARM_DESC(client_reserve, "Attempt client managed reserve/release");
121 
122 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
123                                 struct ibmvscsi_host_data *hostdata);
124 
125 /* ------------------------------------------------------------
126  * Routines for managing the command/response queue
127  */
128 /**
129  * ibmvscsi_handle_event: - Interrupt handler for crq events
130  * @irq:        number of irq to handle, not used
131  * @dev_instance: ibmvscsi_host_data of host that received interrupt
132  *
133  * Disables interrupts and schedules srp_task
134  * Always returns IRQ_HANDLED
135  */
136 static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
137 {
138         struct ibmvscsi_host_data *hostdata =
139             (struct ibmvscsi_host_data *)dev_instance;
140         vio_disable_interrupts(to_vio_dev(hostdata->dev));
141         tasklet_schedule(&hostdata->srp_task);
142         return IRQ_HANDLED;
143 }
144 
145 /**
146  * release_crq_queue: - Deallocates data and unregisters CRQ
147  * @queue:      crq_queue to initialize and register
148  * @host_data:  ibmvscsi_host_data of host
149  *
150  * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
151  * the crq with the hypervisor.
152  */
153 static void ibmvscsi_release_crq_queue(struct crq_queue *queue,
154                                        struct ibmvscsi_host_data *hostdata,
155                                        int max_requests)
156 {
157         long rc = 0;
158         struct vio_dev *vdev = to_vio_dev(hostdata->dev);
159         free_irq(vdev->irq, (void *)hostdata);
160         tasklet_kill(&hostdata->srp_task);
161         do {
162                 if (rc)
163                         msleep(100);
164                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
165         } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
166         dma_unmap_single(hostdata->dev,
167                          queue->msg_token,
168                          queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
169         free_page((unsigned long)queue->msgs);
170 }
171 
172 /**
173  * crq_queue_next_crq: - Returns the next entry in message queue
174  * @queue:      crq_queue to use
175  *
176  * Returns pointer to next entry in queue, or NULL if there are no new
177  * entried in the CRQ.
178  */
179 static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
180 {
181         struct viosrp_crq *crq;
182         unsigned long flags;
183 
184         spin_lock_irqsave(&queue->lock, flags);
185         crq = &queue->msgs[queue->cur];
186         if (crq->valid != VIOSRP_CRQ_FREE) {
187                 if (++queue->cur == queue->size)
188                         queue->cur = 0;
189 
190                 /* Ensure the read of the valid bit occurs before reading any
191                  * other bits of the CRQ entry
192                  */
193                 rmb();
194         } else
195                 crq = NULL;
196         spin_unlock_irqrestore(&queue->lock, flags);
197 
198         return crq;
199 }
200 
201 /**
202  * ibmvscsi_send_crq: - Send a CRQ
203  * @hostdata:   the adapter
204  * @word1:      the first 64 bits of the data
205  * @word2:      the second 64 bits of the data
206  */
207 static int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata,
208                              u64 word1, u64 word2)
209 {
210         struct vio_dev *vdev = to_vio_dev(hostdata->dev);
211 
212         /*
213          * Ensure the command buffer is flushed to memory before handing it
214          * over to the VIOS to prevent it from fetching any stale data.
215          */
216         mb();
217         return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
218 }
219 
220 /**
221  * ibmvscsi_task: - Process srps asynchronously
222  * @data:       ibmvscsi_host_data of host
223  */
224 static void ibmvscsi_task(void *data)
225 {
226         struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
227         struct vio_dev *vdev = to_vio_dev(hostdata->dev);
228         struct viosrp_crq *crq;
229         int done = 0;
230 
231         while (!done) {
232                 /* Pull all the valid messages off the CRQ */
233                 while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
234                         ibmvscsi_handle_crq(crq, hostdata);
235                         crq->valid = VIOSRP_CRQ_FREE;
236                         wmb();
237                 }
238 
239                 vio_enable_interrupts(vdev);
240                 crq = crq_queue_next_crq(&hostdata->queue);
241                 if (crq != NULL) {
242                         vio_disable_interrupts(vdev);
243                         ibmvscsi_handle_crq(crq, hostdata);
244                         crq->valid = VIOSRP_CRQ_FREE;
245                         wmb();
246                 } else {
247                         done = 1;
248                 }
249         }
250 }
251 
252 static void gather_partition_info(void)
253 {
254         const char *ppartition_name;
255         const __be32 *p_number_ptr;
256 
257         /* Retrieve information about this partition */
258         if (!of_root)
259                 return;
260 
261         of_node_get(of_root);
262 
263         ppartition_name = of_get_property(of_root, "ibm,partition-name", NULL);
264         if (ppartition_name)
265                 strncpy(partition_name, ppartition_name,
266                                 sizeof(partition_name));
267         p_number_ptr = of_get_property(of_root, "ibm,partition-no", NULL);
268         if (p_number_ptr)
269                 partition_number = of_read_number(p_number_ptr, 1);
270         of_node_put(of_root);
271 }
272 
273 static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
274 {
275         memset(&hostdata->madapter_info, 0x00,
276                         sizeof(hostdata->madapter_info));
277 
278         dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
279         strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
280 
281         strncpy(hostdata->madapter_info.partition_name, partition_name,
282                         sizeof(hostdata->madapter_info.partition_name));
283 
284         hostdata->madapter_info.partition_number =
285                                         cpu_to_be32(partition_number);
286 
287         hostdata->madapter_info.mad_version = cpu_to_be32(SRP_MAD_VERSION_1);
288         hostdata->madapter_info.os_type = cpu_to_be32(SRP_MAD_OS_LINUX);
289 }
290 
291 /**
292  * reset_crq_queue: - resets a crq after a failure
293  * @queue:      crq_queue to initialize and register
294  * @hostdata:   ibmvscsi_host_data of host
295  *
296  */
297 static int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
298                                     struct ibmvscsi_host_data *hostdata)
299 {
300         int rc = 0;
301         struct vio_dev *vdev = to_vio_dev(hostdata->dev);
302 
303         /* Close the CRQ */
304         do {
305                 if (rc)
306                         msleep(100);
307                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
308         } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
309 
310         /* Clean out the queue */
311         memset(queue->msgs, 0x00, PAGE_SIZE);
312         queue->cur = 0;
313 
314         set_adapter_info(hostdata);
315 
316         /* And re-open it again */
317         rc = plpar_hcall_norets(H_REG_CRQ,
318                                 vdev->unit_address,
319                                 queue->msg_token, PAGE_SIZE);
320         if (rc == H_CLOSED) {
321                 /* Adapter is good, but other end is not ready */
322                 dev_warn(hostdata->dev, "Partner adapter not ready\n");
323         } else if (rc != 0) {
324                 dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
325         }
326         return rc;
327 }
328 
329 /**
330  * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
331  * @queue:      crq_queue to initialize and register
332  * @hostdata:   ibmvscsi_host_data of host
333  *
334  * Allocates a page for messages, maps it for dma, and registers
335  * the crq with the hypervisor.
336  * Returns zero on success.
337  */
338 static int ibmvscsi_init_crq_queue(struct crq_queue *queue,
339                                    struct ibmvscsi_host_data *hostdata,
340                                    int max_requests)
341 {
342         int rc;
343         int retrc;
344         struct vio_dev *vdev = to_vio_dev(hostdata->dev);
345 
346         queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
347 
348         if (!queue->msgs)
349                 goto malloc_failed;
350         queue->size = PAGE_SIZE / sizeof(*queue->msgs);
351 
352         queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
353                                           queue->size * sizeof(*queue->msgs),
354                                           DMA_BIDIRECTIONAL);
355 
356         if (dma_mapping_error(hostdata->dev, queue->msg_token))
357                 goto map_failed;
358 
359         gather_partition_info();
360         set_adapter_info(hostdata);
361 
362         retrc = rc = plpar_hcall_norets(H_REG_CRQ,
363                                 vdev->unit_address,
364                                 queue->msg_token, PAGE_SIZE);
365         if (rc == H_RESOURCE)
366                 /* maybe kexecing and resource is busy. try a reset */
367                 rc = ibmvscsi_reset_crq_queue(queue,
368                                               hostdata);
369 
370         if (rc == H_CLOSED) {
371                 /* Adapter is good, but other end is not ready */
372                 dev_warn(hostdata->dev, "Partner adapter not ready\n");
373                 retrc = 0;
374         } else if (rc != 0) {
375                 dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
376                 goto reg_crq_failed;
377         }
378 
379         queue->cur = 0;
380         spin_lock_init(&queue->lock);
381 
382         tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
383                      (unsigned long)hostdata);
384 
385         if (request_irq(vdev->irq,
386                         ibmvscsi_handle_event,
387                         0, "ibmvscsi", (void *)hostdata) != 0) {
388                 dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
389                         vdev->irq);
390                 goto req_irq_failed;
391         }
392 
393         rc = vio_enable_interrupts(vdev);
394         if (rc != 0) {
395                 dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
396                 goto req_irq_failed;
397         }
398 
399         return retrc;
400 
401       req_irq_failed:
402         tasklet_kill(&hostdata->srp_task);
403         rc = 0;
404         do {
405                 if (rc)
406                         msleep(100);
407                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
408         } while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
409       reg_crq_failed:
410         dma_unmap_single(hostdata->dev,
411                          queue->msg_token,
412                          queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
413       map_failed:
414         free_page((unsigned long)queue->msgs);
415       malloc_failed:
416         return -1;
417 }
418 
419 /**
420  * reenable_crq_queue: - reenables a crq after
421  * @queue:      crq_queue to initialize and register
422  * @hostdata:   ibmvscsi_host_data of host
423  *
424  */
425 static int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
426                                        struct ibmvscsi_host_data *hostdata)
427 {
428         int rc = 0;
429         struct vio_dev *vdev = to_vio_dev(hostdata->dev);
430 
431         /* Re-enable the CRQ */
432         do {
433                 if (rc)
434                         msleep(100);
435                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
436         } while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
437 
438         if (rc)
439                 dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
440         return rc;
441 }
442 
443 /* ------------------------------------------------------------
444  * Routines for the event pool and event structs
445  */
446 /**
447  * initialize_event_pool: - Allocates and initializes the event pool for a host
448  * @pool:       event_pool to be initialized
449  * @size:       Number of events in pool
450  * @hostdata:   ibmvscsi_host_data who owns the event pool
451  *
452  * Returns zero on success.
453 */
454 static int initialize_event_pool(struct event_pool *pool,
455                                  int size, struct ibmvscsi_host_data *hostdata)
456 {
457         int i;
458 
459         pool->size = size;
460         pool->next = 0;
461         pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
462         if (!pool->events)
463                 return -ENOMEM;
464 
465         pool->iu_storage =
466             dma_alloc_coherent(hostdata->dev,
467                                pool->size * sizeof(*pool->iu_storage),
468                                &pool->iu_token, 0);
469         if (!pool->iu_storage) {
470                 kfree(pool->events);
471                 return -ENOMEM;
472         }
473 
474         for (i = 0; i < pool->size; ++i) {
475                 struct srp_event_struct *evt = &pool->events[i];
476                 memset(&evt->crq, 0x00, sizeof(evt->crq));
477                 atomic_set(&evt->free, 1);
478                 evt->crq.valid = VIOSRP_CRQ_CMD_RSP;
479                 evt->crq.IU_length = cpu_to_be16(sizeof(*evt->xfer_iu));
480                 evt->crq.IU_data_ptr = cpu_to_be64(pool->iu_token +
481                         sizeof(*evt->xfer_iu) * i);
482                 evt->xfer_iu = pool->iu_storage + i;
483                 evt->hostdata = hostdata;
484                 evt->ext_list = NULL;
485                 evt->ext_list_token = 0;
486         }
487 
488         return 0;
489 }
490 
491 /**
492  * release_event_pool: - Frees memory of an event pool of a host
493  * @pool:       event_pool to be released
494  * @hostdata:   ibmvscsi_host_data who owns the even pool
495  *
496  * Returns zero on success.
497 */
498 static void release_event_pool(struct event_pool *pool,
499                                struct ibmvscsi_host_data *hostdata)
500 {
501         int i, in_use = 0;
502         for (i = 0; i < pool->size; ++i) {
503                 if (atomic_read(&pool->events[i].free) != 1)
504                         ++in_use;
505                 if (pool->events[i].ext_list) {
506                         dma_free_coherent(hostdata->dev,
507                                   SG_ALL * sizeof(struct srp_direct_buf),
508                                   pool->events[i].ext_list,
509                                   pool->events[i].ext_list_token);
510                 }
511         }
512         if (in_use)
513                 dev_warn(hostdata->dev, "releasing event pool with %d "
514                          "events still in use?\n", in_use);
515         kfree(pool->events);
516         dma_free_coherent(hostdata->dev,
517                           pool->size * sizeof(*pool->iu_storage),
518                           pool->iu_storage, pool->iu_token);
519 }
520 
521 /**
522  * valid_event_struct: - Determines if event is valid.
523  * @pool:       event_pool that contains the event
524  * @evt:        srp_event_struct to be checked for validity
525  *
526  * Returns zero if event is invalid, one otherwise.
527 */
528 static int valid_event_struct(struct event_pool *pool,
529                                 struct srp_event_struct *evt)
530 {
531         int index = evt - pool->events;
532         if (index < 0 || index >= pool->size)   /* outside of bounds */
533                 return 0;
534         if (evt != pool->events + index)        /* unaligned */
535                 return 0;
536         return 1;
537 }
538 
539 /**
540  * ibmvscsi_free-event_struct: - Changes status of event to "free"
541  * @pool:       event_pool that contains the event
542  * @evt:        srp_event_struct to be modified
543  *
544 */
545 static void free_event_struct(struct event_pool *pool,
546                                        struct srp_event_struct *evt)
547 {
548         if (!valid_event_struct(pool, evt)) {
549                 dev_err(evt->hostdata->dev, "Freeing invalid event_struct %p "
550                         "(not in pool %p)\n", evt, pool->events);
551                 return;
552         }
553         if (atomic_inc_return(&evt->free) != 1) {
554                 dev_err(evt->hostdata->dev, "Freeing event_struct %p "
555                         "which is not in use!\n", evt);
556                 return;
557         }
558 }
559 
560 /**
561  * get_evt_struct: - Gets the next free event in pool
562  * @pool:       event_pool that contains the events to be searched
563  *
564  * Returns the next event in "free" state, and NULL if none are free.
565  * Note that no synchronization is done here, we assume the host_lock
566  * will syncrhonze things.
567 */
568 static struct srp_event_struct *get_event_struct(struct event_pool *pool)
569 {
570         int i;
571         int poolsize = pool->size;
572         int offset = pool->next;
573 
574         for (i = 0; i < poolsize; i++) {
575                 offset = (offset + 1) % poolsize;
576                 if (!atomic_dec_if_positive(&pool->events[offset].free)) {
577                         pool->next = offset;
578                         return &pool->events[offset];
579                 }
580         }
581 
582         printk(KERN_ERR "ibmvscsi: found no event struct in pool!\n");
583         return NULL;
584 }
585 
586 /**
587  * init_event_struct: Initialize fields in an event struct that are always 
588  *                    required.
589  * @evt:        The event
590  * @done:       Routine to call when the event is responded to
591  * @format:     SRP or MAD format
592  * @timeout:    timeout value set in the CRQ
593  */
594 static void init_event_struct(struct srp_event_struct *evt_struct,
595                               void (*done) (struct srp_event_struct *),
596                               u8 format,
597                               int timeout)
598 {
599         evt_struct->cmnd = NULL;
600         evt_struct->cmnd_done = NULL;
601         evt_struct->sync_srp = NULL;
602         evt_struct->crq.format = format;
603         evt_struct->crq.timeout = cpu_to_be16(timeout);
604         evt_struct->done = done;
605 }
606 
607 /* ------------------------------------------------------------
608  * Routines for receiving SCSI responses from the hosting partition
609  */
610 
611 /**
612  * set_srp_direction: Set the fields in the srp related to data
613  *     direction and number of buffers based on the direction in
614  *     the scsi_cmnd and the number of buffers
615  */
616 static void set_srp_direction(struct scsi_cmnd *cmd,
617                               struct srp_cmd *srp_cmd, 
618                               int numbuf)
619 {
620         u8 fmt;
621 
622         if (numbuf == 0)
623                 return;
624         
625         if (numbuf == 1)
626                 fmt = SRP_DATA_DESC_DIRECT;
627         else {
628                 fmt = SRP_DATA_DESC_INDIRECT;
629                 numbuf = min(numbuf, MAX_INDIRECT_BUFS);
630 
631                 if (cmd->sc_data_direction == DMA_TO_DEVICE)
632                         srp_cmd->data_out_desc_cnt = numbuf;
633                 else
634                         srp_cmd->data_in_desc_cnt = numbuf;
635         }
636 
637         if (cmd->sc_data_direction == DMA_TO_DEVICE)
638                 srp_cmd->buf_fmt = fmt << 4;
639         else
640                 srp_cmd->buf_fmt = fmt;
641 }
642 
643 /**
644  * unmap_cmd_data: - Unmap data pointed in srp_cmd based on the format
645  * @cmd:        srp_cmd whose additional_data member will be unmapped
646  * @dev:        device for which the memory is mapped
647  *
648 */
649 static void unmap_cmd_data(struct srp_cmd *cmd,
650                            struct srp_event_struct *evt_struct,
651                            struct device *dev)
652 {
653         u8 out_fmt, in_fmt;
654 
655         out_fmt = cmd->buf_fmt >> 4;
656         in_fmt = cmd->buf_fmt & ((1U << 4) - 1);
657 
658         if (out_fmt == SRP_NO_DATA_DESC && in_fmt == SRP_NO_DATA_DESC)
659                 return;
660 
661         if (evt_struct->cmnd)
662                 scsi_dma_unmap(evt_struct->cmnd);
663 }
664 
665 static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
666                        struct srp_direct_buf *md)
667 {
668         int i;
669         struct scatterlist *sg;
670         u64 total_length = 0;
671 
672         scsi_for_each_sg(cmd, sg, nseg, i) {
673                 struct srp_direct_buf *descr = md + i;
674                 descr->va = cpu_to_be64(sg_dma_address(sg));
675                 descr->len = cpu_to_be32(sg_dma_len(sg));
676                 descr->key = 0;
677                 total_length += sg_dma_len(sg);
678         }
679         return total_length;
680 }
681 
682 /**
683  * map_sg_data: - Maps dma for a scatterlist and initializes decriptor fields
684  * @cmd:        Scsi_Cmnd with the scatterlist
685  * @srp_cmd:    srp_cmd that contains the memory descriptor
686  * @dev:        device for which to map dma memory
687  *
688  * Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
689  * Returns 1 on success.
690 */
691 static int map_sg_data(struct scsi_cmnd *cmd,
692                        struct srp_event_struct *evt_struct,
693                        struct srp_cmd *srp_cmd, struct device *dev)
694 {
695 
696         int sg_mapped;
697         u64 total_length = 0;
698         struct srp_direct_buf *data =
699                 (struct srp_direct_buf *) srp_cmd->add_data;
700         struct srp_indirect_buf *indirect =
701                 (struct srp_indirect_buf *) data;
702 
703         sg_mapped = scsi_dma_map(cmd);
704         if (!sg_mapped)
705                 return 1;
706         else if (sg_mapped < 0)
707                 return 0;
708 
709         set_srp_direction(cmd, srp_cmd, sg_mapped);
710 
711         /* special case; we can use a single direct descriptor */
712         if (sg_mapped == 1) {
713                 map_sg_list(cmd, sg_mapped, data);
714                 return 1;
715         }
716 
717         indirect->table_desc.va = 0;
718         indirect->table_desc.len = cpu_to_be32(sg_mapped *
719                                                sizeof(struct srp_direct_buf));
720         indirect->table_desc.key = 0;
721 
722         if (sg_mapped <= MAX_INDIRECT_BUFS) {
723                 total_length = map_sg_list(cmd, sg_mapped,
724                                            &indirect->desc_list[0]);
725                 indirect->len = cpu_to_be32(total_length);
726                 return 1;
727         }
728 
729         /* get indirect table */
730         if (!evt_struct->ext_list) {
731                 evt_struct->ext_list = (struct srp_direct_buf *)
732                         dma_alloc_coherent(dev,
733                                            SG_ALL * sizeof(struct srp_direct_buf),
734                                            &evt_struct->ext_list_token, 0);
735                 if (!evt_struct->ext_list) {
736                         if (!firmware_has_feature(FW_FEATURE_CMO))
737                                 sdev_printk(KERN_ERR, cmd->device,
738                                             "Can't allocate memory "
739                                             "for indirect table\n");
740                         scsi_dma_unmap(cmd);
741                         return 0;
742                 }
743         }
744 
745         total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
746 
747         indirect->len = cpu_to_be32(total_length);
748         indirect->table_desc.va = cpu_to_be64(evt_struct->ext_list_token);
749         indirect->table_desc.len = cpu_to_be32(sg_mapped *
750                                                sizeof(indirect->desc_list[0]));
751         memcpy(indirect->desc_list, evt_struct->ext_list,
752                MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
753         return 1;
754 }
755 
756 /**
757  * map_data_for_srp_cmd: - Calls functions to map data for srp cmds
758  * @cmd:        struct scsi_cmnd with the memory to be mapped
759  * @srp_cmd:    srp_cmd that contains the memory descriptor
760  * @dev:        dma device for which to map dma memory
761  *
762  * Called by scsi_cmd_to_srp_cmd() when converting scsi cmds to srp cmds 
763  * Returns 1 on success.
764 */
765 static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
766                                 struct srp_event_struct *evt_struct,
767                                 struct srp_cmd *srp_cmd, struct device *dev)
768 {
769         switch (cmd->sc_data_direction) {
770         case DMA_FROM_DEVICE:
771         case DMA_TO_DEVICE:
772                 break;
773         case DMA_NONE:
774                 return 1;
775         case DMA_BIDIRECTIONAL:
776                 sdev_printk(KERN_ERR, cmd->device,
777                             "Can't map DMA_BIDIRECTIONAL to read/write\n");
778                 return 0;
779         default:
780                 sdev_printk(KERN_ERR, cmd->device,
781                             "Unknown data direction 0x%02x; can't map!\n",
782                             cmd->sc_data_direction);
783                 return 0;
784         }
785 
786         return map_sg_data(cmd, evt_struct, srp_cmd, dev);
787 }
788 
789 /**
790  * purge_requests: Our virtual adapter just shut down.  purge any sent requests
791  * @hostdata:    the adapter
792  */
793 static void purge_requests(struct ibmvscsi_host_data *hostdata, int error_code)
794 {
795         struct srp_event_struct *evt;
796         unsigned long flags;
797 
798         spin_lock_irqsave(hostdata->host->host_lock, flags);
799         while (!list_empty(&hostdata->sent)) {
800                 evt = list_first_entry(&hostdata->sent, struct srp_event_struct, list);
801                 list_del(&evt->list);
802                 del_timer(&evt->timer);
803 
804                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
805                 if (evt->cmnd) {
806                         evt->cmnd->result = (error_code << 16);
807                         unmap_cmd_data(&evt->iu.srp.cmd, evt,
808                                        evt->hostdata->dev);
809                         if (evt->cmnd_done)
810                                 evt->cmnd_done(evt->cmnd);
811                 } else if (evt->done && evt->crq.format != VIOSRP_MAD_FORMAT &&
812                            evt->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
813                         evt->done(evt);
814                 free_event_struct(&evt->hostdata->pool, evt);
815                 spin_lock_irqsave(hostdata->host->host_lock, flags);
816         }
817         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
818 }
819 
820 /**
821  * ibmvscsi_reset_host - Reset the connection to the server
822  * @hostdata:   struct ibmvscsi_host_data to reset
823 */
824 static void ibmvscsi_reset_host(struct ibmvscsi_host_data *hostdata)
825 {
826         scsi_block_requests(hostdata->host);
827         atomic_set(&hostdata->request_limit, 0);
828 
829         purge_requests(hostdata, DID_ERROR);
830         hostdata->reset_crq = 1;
831         wake_up(&hostdata->work_wait_q);
832 }
833 
834 /**
835  * ibmvscsi_timeout - Internal command timeout handler
836  * @evt_struct: struct srp_event_struct that timed out
837  *
838  * Called when an internally generated command times out
839 */
840 static void ibmvscsi_timeout(struct srp_event_struct *evt_struct)
841 {
842         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
843 
844         dev_err(hostdata->dev, "Command timed out (%x). Resetting connection\n",
845                 evt_struct->iu.srp.cmd.opcode);
846 
847         ibmvscsi_reset_host(hostdata);
848 }
849 
850 
851 /* ------------------------------------------------------------
852  * Routines for sending and receiving SRPs
853  */
854 /**
855  * ibmvscsi_send_srp_event: - Transforms event to u64 array and calls send_crq()
856  * @evt_struct: evt_struct to be sent
857  * @hostdata:   ibmvscsi_host_data of host
858  * @timeout:    timeout in seconds - 0 means do not time command
859  *
860  * Returns the value returned from ibmvscsi_send_crq(). (Zero for success)
861  * Note that this routine assumes that host_lock is held for synchronization
862 */
863 static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct,
864                                    struct ibmvscsi_host_data *hostdata,
865                                    unsigned long timeout)
866 {
867         __be64 *crq_as_u64 = (__be64 *)&evt_struct->crq;
868         int request_status = 0;
869         int rc;
870         int srp_req = 0;
871 
872         /* If we have exhausted our request limit, just fail this request,
873          * unless it is for a reset or abort.
874          * Note that there are rare cases involving driver generated requests 
875          * (such as task management requests) that the mid layer may think we
876          * can handle more requests (can_queue) when we actually can't
877          */
878         if (evt_struct->crq.format == VIOSRP_SRP_FORMAT) {
879                 srp_req = 1;
880                 request_status =
881                         atomic_dec_if_positive(&hostdata->request_limit);
882                 /* If request limit was -1 when we started, it is now even
883                  * less than that
884                  */
885                 if (request_status < -1)
886                         goto send_error;
887                 /* Otherwise, we may have run out of requests. */
888                 /* If request limit was 0 when we started the adapter is in the
889                  * process of performing a login with the server adapter, or
890                  * we may have run out of requests.
891                  */
892                 else if (request_status == -1 &&
893                          evt_struct->iu.srp.login_req.opcode != SRP_LOGIN_REQ)
894                         goto send_busy;
895                 /* Abort and reset calls should make it through.
896                  * Nothing except abort and reset should use the last two
897                  * slots unless we had two or less to begin with.
898                  */
899                 else if (request_status < 2 &&
900                          evt_struct->iu.srp.cmd.opcode != SRP_TSK_MGMT) {
901                         /* In the case that we have less than two requests
902                          * available, check the server limit as a combination
903                          * of the request limit and the number of requests
904                          * in-flight (the size of the send list).  If the
905                          * server limit is greater than 2, return busy so
906                          * that the last two are reserved for reset and abort.
907                          */
908                         int server_limit = request_status;
909                         struct srp_event_struct *tmp_evt;
910 
911                         list_for_each_entry(tmp_evt, &hostdata->sent, list) {
912                                 server_limit++;
913                         }
914 
915                         if (server_limit > 2)
916                                 goto send_busy;
917                 }
918         }
919 
920         /* Copy the IU into the transfer area */
921         *evt_struct->xfer_iu = evt_struct->iu;
922         evt_struct->xfer_iu->srp.rsp.tag = (u64)evt_struct;
923 
924         /* Add this to the sent list.  We need to do this 
925          * before we actually send 
926          * in case it comes back REALLY fast
927          */
928         list_add_tail(&evt_struct->list, &hostdata->sent);
929 
930         init_timer(&evt_struct->timer);
931         if (timeout) {
932                 evt_struct->timer.data = (unsigned long) evt_struct;
933                 evt_struct->timer.expires = jiffies + (timeout * HZ);
934                 evt_struct->timer.function = (void (*)(unsigned long))ibmvscsi_timeout;
935                 add_timer(&evt_struct->timer);
936         }
937 
938         rc = ibmvscsi_send_crq(hostdata, be64_to_cpu(crq_as_u64[0]),
939                                be64_to_cpu(crq_as_u64[1]));
940         if (rc != 0) {
941                 list_del(&evt_struct->list);
942                 del_timer(&evt_struct->timer);
943 
944                 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
945                  * Firmware will send a CRQ with a transport event (0xFF) to
946                  * tell this client what has happened to the transport.  This
947                  * will be handled in ibmvscsi_handle_crq()
948                  */
949                 if (rc == H_CLOSED) {
950                         dev_warn(hostdata->dev, "send warning. "
951                                  "Receive queue closed, will retry.\n");
952                         goto send_busy;
953                 }
954                 dev_err(hostdata->dev, "send error %d\n", rc);
955                 if (srp_req)
956                         atomic_inc(&hostdata->request_limit);
957                 goto send_error;
958         }
959 
960         return 0;
961 
962  send_busy:
963         unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
964 
965         free_event_struct(&hostdata->pool, evt_struct);
966         if (srp_req && request_status != -1)
967                 atomic_inc(&hostdata->request_limit);
968         return SCSI_MLQUEUE_HOST_BUSY;
969 
970  send_error:
971         unmap_cmd_data(&evt_struct->iu.srp.cmd, evt_struct, hostdata->dev);
972 
973         if (evt_struct->cmnd != NULL) {
974                 evt_struct->cmnd->result = DID_ERROR << 16;
975                 evt_struct->cmnd_done(evt_struct->cmnd);
976         } else if (evt_struct->done)
977                 evt_struct->done(evt_struct);
978 
979         free_event_struct(&hostdata->pool, evt_struct);
980         return 0;
981 }
982 
983 /**
984  * handle_cmd_rsp: -  Handle responses from commands
985  * @evt_struct: srp_event_struct to be handled
986  *
987  * Used as a callback by when sending scsi cmds.
988  * Gets called by ibmvscsi_handle_crq()
989 */
990 static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
991 {
992         struct srp_rsp *rsp = &evt_struct->xfer_iu->srp.rsp;
993         struct scsi_cmnd *cmnd = evt_struct->cmnd;
994 
995         if (unlikely(rsp->opcode != SRP_RSP)) {
996                 if (printk_ratelimit())
997                         dev_warn(evt_struct->hostdata->dev,
998                                  "bad SRP RSP type %#02x\n", rsp->opcode);
999         }
1000         
1001         if (cmnd) {
1002                 cmnd->result |= rsp->status;
1003                 if (((cmnd->result >> 1) & 0x1f) == CHECK_CONDITION)
1004                         memcpy(cmnd->sense_buffer,
1005                                rsp->data,
1006                                be32_to_cpu(rsp->sense_data_len));
1007                 unmap_cmd_data(&evt_struct->iu.srp.cmd, 
1008                                evt_struct, 
1009                                evt_struct->hostdata->dev);
1010 
1011                 if (rsp->flags & SRP_RSP_FLAG_DOOVER)
1012                         scsi_set_resid(cmnd,
1013                                        be32_to_cpu(rsp->data_out_res_cnt));
1014                 else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
1015                         scsi_set_resid(cmnd, be32_to_cpu(rsp->data_in_res_cnt));
1016         }
1017 
1018         if (evt_struct->cmnd_done)
1019                 evt_struct->cmnd_done(cmnd);
1020 }
1021 
1022 /**
1023  * lun_from_dev: - Returns the lun of the scsi device
1024  * @dev:        struct scsi_device
1025  *
1026 */
1027 static inline u16 lun_from_dev(struct scsi_device *dev)
1028 {
1029         return (0x2 << 14) | (dev->id << 8) | (dev->channel << 5) | dev->lun;
1030 }
1031 
1032 /**
1033  * ibmvscsi_queue: - The queuecommand function of the scsi template 
1034  * @cmd:        struct scsi_cmnd to be executed
1035  * @done:       Callback function to be called when cmd is completed
1036 */
1037 static int ibmvscsi_queuecommand_lck(struct scsi_cmnd *cmnd,
1038                                  void (*done) (struct scsi_cmnd *))
1039 {
1040         struct srp_cmd *srp_cmd;
1041         struct srp_event_struct *evt_struct;
1042         struct srp_indirect_buf *indirect;
1043         struct ibmvscsi_host_data *hostdata = shost_priv(cmnd->device->host);
1044         u16 lun = lun_from_dev(cmnd->device);
1045         u8 out_fmt, in_fmt;
1046 
1047         cmnd->result = (DID_OK << 16);
1048         evt_struct = get_event_struct(&hostdata->pool);
1049         if (!evt_struct)
1050                 return SCSI_MLQUEUE_HOST_BUSY;
1051 
1052         /* Set up the actual SRP IU */
1053         srp_cmd = &evt_struct->iu.srp.cmd;
1054         memset(srp_cmd, 0x00, SRP_MAX_IU_LEN);
1055         srp_cmd->opcode = SRP_CMD;
1056         memcpy(srp_cmd->cdb, cmnd->cmnd, sizeof(srp_cmd->cdb));
1057         int_to_scsilun(lun, &srp_cmd->lun);
1058 
1059         if (!map_data_for_srp_cmd(cmnd, evt_struct, srp_cmd, hostdata->dev)) {
1060                 if (!firmware_has_feature(FW_FEATURE_CMO))
1061                         sdev_printk(KERN_ERR, cmnd->device,
1062                                     "couldn't convert cmd to srp_cmd\n");
1063                 free_event_struct(&hostdata->pool, evt_struct);
1064                 return SCSI_MLQUEUE_HOST_BUSY;
1065         }
1066 
1067         init_event_struct(evt_struct,
1068                           handle_cmd_rsp,
1069                           VIOSRP_SRP_FORMAT,
1070                           cmnd->request->timeout/HZ);
1071 
1072         evt_struct->cmnd = cmnd;
1073         evt_struct->cmnd_done = done;
1074 
1075         /* Fix up dma address of the buffer itself */
1076         indirect = (struct srp_indirect_buf *) srp_cmd->add_data;
1077         out_fmt = srp_cmd->buf_fmt >> 4;
1078         in_fmt = srp_cmd->buf_fmt & ((1U << 4) - 1);
1079         if ((in_fmt == SRP_DATA_DESC_INDIRECT ||
1080              out_fmt == SRP_DATA_DESC_INDIRECT) &&
1081             indirect->table_desc.va == 0) {
1082                 indirect->table_desc.va =
1083                         cpu_to_be64(be64_to_cpu(evt_struct->crq.IU_data_ptr) +
1084                         offsetof(struct srp_cmd, add_data) +
1085                         offsetof(struct srp_indirect_buf, desc_list));
1086         }
1087 
1088         return ibmvscsi_send_srp_event(evt_struct, hostdata, 0);
1089 }
1090 
1091 static DEF_SCSI_QCMD(ibmvscsi_queuecommand)
1092 
1093 /* ------------------------------------------------------------
1094  * Routines for driver initialization
1095  */
1096 
1097 /**
1098  * map_persist_bufs: - Pre-map persistent data for adapter logins
1099  * @hostdata:   ibmvscsi_host_data of host
1100  *
1101  * Map the capabilities and adapter info DMA buffers to avoid runtime failures.
1102  * Return 1 on error, 0 on success.
1103  */
1104 static int map_persist_bufs(struct ibmvscsi_host_data *hostdata)
1105 {
1106 
1107         hostdata->caps_addr = dma_map_single(hostdata->dev, &hostdata->caps,
1108                                              sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1109 
1110         if (dma_mapping_error(hostdata->dev, hostdata->caps_addr)) {
1111                 dev_err(hostdata->dev, "Unable to map capabilities buffer!\n");
1112                 return 1;
1113         }
1114 
1115         hostdata->adapter_info_addr = dma_map_single(hostdata->dev,
1116                                                      &hostdata->madapter_info,
1117                                                      sizeof(hostdata->madapter_info),
1118                                                      DMA_BIDIRECTIONAL);
1119         if (dma_mapping_error(hostdata->dev, hostdata->adapter_info_addr)) {
1120                 dev_err(hostdata->dev, "Unable to map adapter info buffer!\n");
1121                 dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1122                                  sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1123                 return 1;
1124         }
1125 
1126         return 0;
1127 }
1128 
1129 /**
1130  * unmap_persist_bufs: - Unmap persistent data needed for adapter logins
1131  * @hostdata:   ibmvscsi_host_data of host
1132  *
1133  * Unmap the capabilities and adapter info DMA buffers
1134  */
1135 static void unmap_persist_bufs(struct ibmvscsi_host_data *hostdata)
1136 {
1137         dma_unmap_single(hostdata->dev, hostdata->caps_addr,
1138                          sizeof(hostdata->caps), DMA_BIDIRECTIONAL);
1139 
1140         dma_unmap_single(hostdata->dev, hostdata->adapter_info_addr,
1141                          sizeof(hostdata->madapter_info), DMA_BIDIRECTIONAL);
1142 }
1143 
1144 /**
1145  * login_rsp: - Handle response to SRP login request
1146  * @evt_struct: srp_event_struct with the response
1147  *
1148  * Used as a "done" callback by when sending srp_login. Gets called
1149  * by ibmvscsi_handle_crq()
1150 */
1151 static void login_rsp(struct srp_event_struct *evt_struct)
1152 {
1153         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1154         switch (evt_struct->xfer_iu->srp.login_rsp.opcode) {
1155         case SRP_LOGIN_RSP:     /* it worked! */
1156                 break;
1157         case SRP_LOGIN_REJ:     /* refused! */
1158                 dev_info(hostdata->dev, "SRP_LOGIN_REJ reason %u\n",
1159                          evt_struct->xfer_iu->srp.login_rej.reason);
1160                 /* Login failed.  */
1161                 atomic_set(&hostdata->request_limit, -1);
1162                 return;
1163         default:
1164                 dev_err(hostdata->dev, "Invalid login response typecode 0x%02x!\n",
1165                         evt_struct->xfer_iu->srp.login_rsp.opcode);
1166                 /* Login failed.  */
1167                 atomic_set(&hostdata->request_limit, -1);
1168                 return;
1169         }
1170 
1171         dev_info(hostdata->dev, "SRP_LOGIN succeeded\n");
1172         hostdata->client_migrated = 0;
1173 
1174         /* Now we know what the real request-limit is.
1175          * This value is set rather than added to request_limit because
1176          * request_limit could have been set to -1 by this client.
1177          */
1178         atomic_set(&hostdata->request_limit,
1179                    be32_to_cpu(evt_struct->xfer_iu->srp.login_rsp.req_lim_delta));
1180 
1181         /* If we had any pending I/Os, kick them */
1182         scsi_unblock_requests(hostdata->host);
1183 }
1184 
1185 /**
1186  * send_srp_login: - Sends the srp login
1187  * @hostdata:   ibmvscsi_host_data of host
1188  *
1189  * Returns zero if successful.
1190 */
1191 static int send_srp_login(struct ibmvscsi_host_data *hostdata)
1192 {
1193         int rc;
1194         unsigned long flags;
1195         struct srp_login_req *login;
1196         struct srp_event_struct *evt_struct = get_event_struct(&hostdata->pool);
1197 
1198         BUG_ON(!evt_struct);
1199         init_event_struct(evt_struct, login_rsp,
1200                           VIOSRP_SRP_FORMAT, login_timeout);
1201 
1202         login = &evt_struct->iu.srp.login_req;
1203         memset(login, 0, sizeof(*login));
1204         login->opcode = SRP_LOGIN_REQ;
1205         login->req_it_iu_len = cpu_to_be32(sizeof(union srp_iu));
1206         login->req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
1207                                          SRP_BUF_FORMAT_INDIRECT);
1208 
1209         spin_lock_irqsave(hostdata->host->host_lock, flags);
1210         /* Start out with a request limit of 0, since this is negotiated in
1211          * the login request we are just sending and login requests always
1212          * get sent by the driver regardless of request_limit.
1213          */
1214         atomic_set(&hostdata->request_limit, 0);
1215 
1216         rc = ibmvscsi_send_srp_event(evt_struct, hostdata, login_timeout * 2);
1217         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1218         dev_info(hostdata->dev, "sent SRP login\n");
1219         return rc;
1220 };
1221 
1222 /**
1223  * capabilities_rsp: - Handle response to MAD adapter capabilities request
1224  * @evt_struct: srp_event_struct with the response
1225  *
1226  * Used as a "done" callback by when sending adapter_info.
1227  */
1228 static void capabilities_rsp(struct srp_event_struct *evt_struct)
1229 {
1230         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1231 
1232         if (evt_struct->xfer_iu->mad.capabilities.common.status) {
1233                 dev_err(hostdata->dev, "error 0x%X getting capabilities info\n",
1234                         evt_struct->xfer_iu->mad.capabilities.common.status);
1235         } else {
1236                 if (hostdata->caps.migration.common.server_support !=
1237                     cpu_to_be16(SERVER_SUPPORTS_CAP))
1238                         dev_info(hostdata->dev, "Partition migration not supported\n");
1239 
1240                 if (client_reserve) {
1241                         if (hostdata->caps.reserve.common.server_support ==
1242                             cpu_to_be16(SERVER_SUPPORTS_CAP))
1243                                 dev_info(hostdata->dev, "Client reserve enabled\n");
1244                         else
1245                                 dev_info(hostdata->dev, "Client reserve not supported\n");
1246                 }
1247         }
1248 
1249         send_srp_login(hostdata);
1250 }
1251 
1252 /**
1253  * send_mad_capabilities: - Sends the mad capabilities request
1254  *      and stores the result so it can be retrieved with
1255  * @hostdata:   ibmvscsi_host_data of host
1256  */
1257 static void send_mad_capabilities(struct ibmvscsi_host_data *hostdata)
1258 {
1259         struct viosrp_capabilities *req;
1260         struct srp_event_struct *evt_struct;
1261         unsigned long flags;
1262         struct device_node *of_node = hostdata->dev->of_node;
1263         const char *location;
1264 
1265         evt_struct = get_event_struct(&hostdata->pool);
1266         BUG_ON(!evt_struct);
1267 
1268         init_event_struct(evt_struct, capabilities_rsp,
1269                           VIOSRP_MAD_FORMAT, info_timeout);
1270 
1271         req = &evt_struct->iu.mad.capabilities;
1272         memset(req, 0, sizeof(*req));
1273 
1274         hostdata->caps.flags = cpu_to_be32(CAP_LIST_SUPPORTED);
1275         if (hostdata->client_migrated)
1276                 hostdata->caps.flags |= cpu_to_be32(CLIENT_MIGRATED);
1277 
1278         strncpy(hostdata->caps.name, dev_name(&hostdata->host->shost_gendev),
1279                 sizeof(hostdata->caps.name));
1280         hostdata->caps.name[sizeof(hostdata->caps.name) - 1] = '\0';
1281 
1282         location = of_get_property(of_node, "ibm,loc-code", NULL);
1283         location = location ? location : dev_name(hostdata->dev);
1284         strncpy(hostdata->caps.loc, location, sizeof(hostdata->caps.loc));
1285         hostdata->caps.loc[sizeof(hostdata->caps.loc) - 1] = '\0';
1286 
1287         req->common.type = cpu_to_be32(VIOSRP_CAPABILITIES_TYPE);
1288         req->buffer = cpu_to_be64(hostdata->caps_addr);
1289 
1290         hostdata->caps.migration.common.cap_type =
1291                                 cpu_to_be32(MIGRATION_CAPABILITIES);
1292         hostdata->caps.migration.common.length =
1293                                 cpu_to_be16(sizeof(hostdata->caps.migration));
1294         hostdata->caps.migration.common.server_support =
1295                                 cpu_to_be16(SERVER_SUPPORTS_CAP);
1296         hostdata->caps.migration.ecl = cpu_to_be32(1);
1297 
1298         if (client_reserve) {
1299                 hostdata->caps.reserve.common.cap_type =
1300                                         cpu_to_be32(RESERVATION_CAPABILITIES);
1301                 hostdata->caps.reserve.common.length =
1302                                 cpu_to_be16(sizeof(hostdata->caps.reserve));
1303                 hostdata->caps.reserve.common.server_support =
1304                                 cpu_to_be16(SERVER_SUPPORTS_CAP);
1305                 hostdata->caps.reserve.type =
1306                                 cpu_to_be32(CLIENT_RESERVE_SCSI_2);
1307                 req->common.length =
1308                                 cpu_to_be16(sizeof(hostdata->caps));
1309         } else
1310                 req->common.length = cpu_to_be16(sizeof(hostdata->caps) -
1311                                                 sizeof(hostdata->caps.reserve));
1312 
1313         spin_lock_irqsave(hostdata->host->host_lock, flags);
1314         if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1315                 dev_err(hostdata->dev, "couldn't send CAPABILITIES_REQ!\n");
1316         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1317 };
1318 
1319 /**
1320  * fast_fail_rsp: - Handle response to MAD enable fast fail
1321  * @evt_struct: srp_event_struct with the response
1322  *
1323  * Used as a "done" callback by when sending enable fast fail. Gets called
1324  * by ibmvscsi_handle_crq()
1325  */
1326 static void fast_fail_rsp(struct srp_event_struct *evt_struct)
1327 {
1328         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1329         u16 status = be16_to_cpu(evt_struct->xfer_iu->mad.fast_fail.common.status);
1330 
1331         if (status == VIOSRP_MAD_NOT_SUPPORTED)
1332                 dev_err(hostdata->dev, "fast_fail not supported in server\n");
1333         else if (status == VIOSRP_MAD_FAILED)
1334                 dev_err(hostdata->dev, "fast_fail request failed\n");
1335         else if (status != VIOSRP_MAD_SUCCESS)
1336                 dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
1337 
1338         send_mad_capabilities(hostdata);
1339 }
1340 
1341 /**
1342  * init_host - Start host initialization
1343  * @hostdata:   ibmvscsi_host_data of host
1344  *
1345  * Returns zero if successful.
1346  */
1347 static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
1348 {
1349         int rc;
1350         unsigned long flags;
1351         struct viosrp_fast_fail *fast_fail_mad;
1352         struct srp_event_struct *evt_struct;
1353 
1354         if (!fast_fail) {
1355                 send_mad_capabilities(hostdata);
1356                 return 0;
1357         }
1358 
1359         evt_struct = get_event_struct(&hostdata->pool);
1360         BUG_ON(!evt_struct);
1361 
1362         init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
1363 
1364         fast_fail_mad = &evt_struct->iu.mad.fast_fail;
1365         memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
1366         fast_fail_mad->common.type = cpu_to_be32(VIOSRP_ENABLE_FAST_FAIL);
1367         fast_fail_mad->common.length = cpu_to_be16(sizeof(*fast_fail_mad));
1368 
1369         spin_lock_irqsave(hostdata->host->host_lock, flags);
1370         rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
1371         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1372         return rc;
1373 }
1374 
1375 /**
1376  * adapter_info_rsp: - Handle response to MAD adapter info request
1377  * @evt_struct: srp_event_struct with the response
1378  *
1379  * Used as a "done" callback by when sending adapter_info. Gets called
1380  * by ibmvscsi_handle_crq()
1381 */
1382 static void adapter_info_rsp(struct srp_event_struct *evt_struct)
1383 {
1384         struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
1385 
1386         if (evt_struct->xfer_iu->mad.adapter_info.common.status) {
1387                 dev_err(hostdata->dev, "error %d getting adapter info\n",
1388                         evt_struct->xfer_iu->mad.adapter_info.common.status);
1389         } else {
1390                 dev_info(hostdata->dev, "host srp version: %s, "
1391                          "host partition %s (%d), OS %d, max io %u\n",
1392                          hostdata->madapter_info.srp_version,
1393                          hostdata->madapter_info.partition_name,
1394                          be32_to_cpu(hostdata->madapter_info.partition_number),
1395                          be32_to_cpu(hostdata->madapter_info.os_type),
1396                          be32_to_cpu(hostdata->madapter_info.port_max_txu[0]));
1397                 
1398                 if (hostdata->madapter_info.port_max_txu[0]) 
1399                         hostdata->host->max_sectors = 
1400                                 be32_to_cpu(hostdata->madapter_info.port_max_txu[0]) >> 9;
1401                 
1402                 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX &&
1403                     strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
1404                         dev_err(hostdata->dev, "host (Ver. %s) doesn't support large transfers\n",
1405                                 hostdata->madapter_info.srp_version);
1406                         dev_err(hostdata->dev, "limiting scatterlists to %d\n",
1407                                 MAX_INDIRECT_BUFS);
1408                         hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
1409                 }
1410 
1411                 if (be32_to_cpu(hostdata->madapter_info.os_type) == SRP_MAD_OS_AIX) {
1412                         enable_fast_fail(hostdata);
1413                         return;
1414                 }
1415         }
1416 
1417         send_srp_login(hostdata);
1418 }
1419 
1420 /**
1421  * send_mad_adapter_info: - Sends the mad adapter info request
1422  *      and stores the result so it can be retrieved with
1423  *      sysfs.  We COULD consider causing a failure if the
1424  *      returned SRP version doesn't match ours.
1425  * @hostdata:   ibmvscsi_host_data of host
1426  * 
1427  * Returns zero if successful.
1428 */
1429 static void send_mad_adapter_info(struct ibmvscsi_host_data *hostdata)
1430 {
1431         struct viosrp_adapter_info *req;
1432         struct srp_event_struct *evt_struct;
1433         unsigned long flags;
1434 
1435         evt_struct = get_event_struct(&hostdata->pool);
1436         BUG_ON(!evt_struct);
1437 
1438         init_event_struct(evt_struct,
1439                           adapter_info_rsp,
1440                           VIOSRP_MAD_FORMAT,
1441                           info_timeout);
1442         
1443         req = &evt_struct->iu.mad.adapter_info;
1444         memset(req, 0x00, sizeof(*req));
1445         
1446         req->common.type = cpu_to_be32(VIOSRP_ADAPTER_INFO_TYPE);
1447         req->common.length = cpu_to_be16(sizeof(hostdata->madapter_info));
1448         req->buffer = cpu_to_be64(hostdata->adapter_info_addr);
1449 
1450         spin_lock_irqsave(hostdata->host->host_lock, flags);
1451         if (ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2))
1452                 dev_err(hostdata->dev, "couldn't send ADAPTER_INFO_REQ!\n");
1453         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1454 };
1455 
1456 /**
1457  * init_adapter: Start virtual adapter initialization sequence
1458  *
1459  */
1460 static void init_adapter(struct ibmvscsi_host_data *hostdata)
1461 {
1462         send_mad_adapter_info(hostdata);
1463 }
1464 
1465 /**
1466  * sync_completion: Signal that a synchronous command has completed
1467  * Note that after returning from this call, the evt_struct is freed.
1468  * the caller waiting on this completion shouldn't touch the evt_struct
1469  * again.
1470  */
1471 static void sync_completion(struct srp_event_struct *evt_struct)
1472 {
1473         /* copy the response back */
1474         if (evt_struct->sync_srp)
1475                 *evt_struct->sync_srp = *evt_struct->xfer_iu;
1476         
1477         complete(&evt_struct->comp);
1478 }
1479 
1480 /**
1481  * ibmvscsi_abort: Abort a command...from scsi host template
1482  * send this over to the server and wait synchronously for the response
1483  */
1484 static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd)
1485 {
1486         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1487         struct srp_tsk_mgmt *tsk_mgmt;
1488         struct srp_event_struct *evt;
1489         struct srp_event_struct *tmp_evt, *found_evt;
1490         union viosrp_iu srp_rsp;
1491         int rsp_rc;
1492         unsigned long flags;
1493         u16 lun = lun_from_dev(cmd->device);
1494         unsigned long wait_switch = 0;
1495 
1496         /* First, find this command in our sent list so we can figure
1497          * out the correct tag
1498          */
1499         spin_lock_irqsave(hostdata->host->host_lock, flags);
1500         wait_switch = jiffies + (init_timeout * HZ);
1501         do {
1502                 found_evt = NULL;
1503                 list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1504                         if (tmp_evt->cmnd == cmd) {
1505                                 found_evt = tmp_evt;
1506                                 break;
1507                         }
1508                 }
1509 
1510                 if (!found_evt) {
1511                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1512                         return SUCCESS;
1513                 }
1514 
1515                 evt = get_event_struct(&hostdata->pool);
1516                 if (evt == NULL) {
1517                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1518                         sdev_printk(KERN_ERR, cmd->device,
1519                                 "failed to allocate abort event\n");
1520                         return FAILED;
1521                 }
1522         
1523                 init_event_struct(evt,
1524                                   sync_completion,
1525                                   VIOSRP_SRP_FORMAT,
1526                                   abort_timeout);
1527 
1528                 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1529         
1530                 /* Set up an abort SRP command */
1531                 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1532                 tsk_mgmt->opcode = SRP_TSK_MGMT;
1533                 int_to_scsilun(lun, &tsk_mgmt->lun);
1534                 tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK;
1535                 tsk_mgmt->task_tag = (u64) found_evt;
1536 
1537                 evt->sync_srp = &srp_rsp;
1538 
1539                 init_completion(&evt->comp);
1540                 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, abort_timeout * 2);
1541 
1542                 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1543                         break;
1544 
1545                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1546                 msleep(10);
1547                 spin_lock_irqsave(hostdata->host->host_lock, flags);
1548         } while (time_before(jiffies, wait_switch));
1549 
1550         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1551 
1552         if (rsp_rc != 0) {
1553                 sdev_printk(KERN_ERR, cmd->device,
1554                             "failed to send abort() event. rc=%d\n", rsp_rc);
1555                 return FAILED;
1556         }
1557 
1558         sdev_printk(KERN_INFO, cmd->device,
1559                     "aborting command. lun 0x%llx, tag 0x%llx\n",
1560                     (((u64) lun) << 48), (u64) found_evt);
1561 
1562         wait_for_completion(&evt->comp);
1563 
1564         /* make sure we got a good response */
1565         if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1566                 if (printk_ratelimit())
1567                         sdev_printk(KERN_WARNING, cmd->device, "abort bad SRP RSP type %d\n",
1568                                     srp_rsp.srp.rsp.opcode);
1569                 return FAILED;
1570         }
1571 
1572         if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1573                 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1574         else
1575                 rsp_rc = srp_rsp.srp.rsp.status;
1576 
1577         if (rsp_rc) {
1578                 if (printk_ratelimit())
1579                         sdev_printk(KERN_WARNING, cmd->device,
1580                                     "abort code %d for task tag 0x%llx\n",
1581                                     rsp_rc, tsk_mgmt->task_tag);
1582                 return FAILED;
1583         }
1584 
1585         /* Because we dropped the spinlock above, it's possible
1586          * The event is no longer in our list.  Make sure it didn't
1587          * complete while we were aborting
1588          */
1589         spin_lock_irqsave(hostdata->host->host_lock, flags);
1590         found_evt = NULL;
1591         list_for_each_entry(tmp_evt, &hostdata->sent, list) {
1592                 if (tmp_evt->cmnd == cmd) {
1593                         found_evt = tmp_evt;
1594                         break;
1595                 }
1596         }
1597 
1598         if (found_evt == NULL) {
1599                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1600                 sdev_printk(KERN_INFO, cmd->device, "aborted task tag 0x%llx completed\n",
1601                             tsk_mgmt->task_tag);
1602                 return SUCCESS;
1603         }
1604 
1605         sdev_printk(KERN_INFO, cmd->device, "successfully aborted task tag 0x%llx\n",
1606                     tsk_mgmt->task_tag);
1607 
1608         cmd->result = (DID_ABORT << 16);
1609         list_del(&found_evt->list);
1610         unmap_cmd_data(&found_evt->iu.srp.cmd, found_evt,
1611                        found_evt->hostdata->dev);
1612         free_event_struct(&found_evt->hostdata->pool, found_evt);
1613         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1614         atomic_inc(&hostdata->request_limit);
1615         return SUCCESS;
1616 }
1617 
1618 /**
1619  * ibmvscsi_eh_device_reset_handler: Reset a single LUN...from scsi host 
1620  * template send this over to the server and wait synchronously for the 
1621  * response
1622  */
1623 static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd)
1624 {
1625         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1626         struct srp_tsk_mgmt *tsk_mgmt;
1627         struct srp_event_struct *evt;
1628         struct srp_event_struct *tmp_evt, *pos;
1629         union viosrp_iu srp_rsp;
1630         int rsp_rc;
1631         unsigned long flags;
1632         u16 lun = lun_from_dev(cmd->device);
1633         unsigned long wait_switch = 0;
1634 
1635         spin_lock_irqsave(hostdata->host->host_lock, flags);
1636         wait_switch = jiffies + (init_timeout * HZ);
1637         do {
1638                 evt = get_event_struct(&hostdata->pool);
1639                 if (evt == NULL) {
1640                         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1641                         sdev_printk(KERN_ERR, cmd->device,
1642                                 "failed to allocate reset event\n");
1643                         return FAILED;
1644                 }
1645         
1646                 init_event_struct(evt,
1647                                   sync_completion,
1648                                   VIOSRP_SRP_FORMAT,
1649                                   reset_timeout);
1650 
1651                 tsk_mgmt = &evt->iu.srp.tsk_mgmt;
1652 
1653                 /* Set up a lun reset SRP command */
1654                 memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt));
1655                 tsk_mgmt->opcode = SRP_TSK_MGMT;
1656                 int_to_scsilun(lun, &tsk_mgmt->lun);
1657                 tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET;
1658 
1659                 evt->sync_srp = &srp_rsp;
1660 
1661                 init_completion(&evt->comp);
1662                 rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, reset_timeout * 2);
1663 
1664                 if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY)
1665                         break;
1666 
1667                 spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1668                 msleep(10);
1669                 spin_lock_irqsave(hostdata->host->host_lock, flags);
1670         } while (time_before(jiffies, wait_switch));
1671 
1672         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1673 
1674         if (rsp_rc != 0) {
1675                 sdev_printk(KERN_ERR, cmd->device,
1676                             "failed to send reset event. rc=%d\n", rsp_rc);
1677                 return FAILED;
1678         }
1679 
1680         sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%llx\n",
1681                     (((u64) lun) << 48));
1682 
1683         wait_for_completion(&evt->comp);
1684 
1685         /* make sure we got a good response */
1686         if (unlikely(srp_rsp.srp.rsp.opcode != SRP_RSP)) {
1687                 if (printk_ratelimit())
1688                         sdev_printk(KERN_WARNING, cmd->device, "reset bad SRP RSP type %d\n",
1689                                     srp_rsp.srp.rsp.opcode);
1690                 return FAILED;
1691         }
1692 
1693         if (srp_rsp.srp.rsp.flags & SRP_RSP_FLAG_RSPVALID)
1694                 rsp_rc = *((int *)srp_rsp.srp.rsp.data);
1695         else
1696                 rsp_rc = srp_rsp.srp.rsp.status;
1697 
1698         if (rsp_rc) {
1699                 if (printk_ratelimit())
1700                         sdev_printk(KERN_WARNING, cmd->device,
1701                                     "reset code %d for task tag 0x%llx\n",
1702                                     rsp_rc, tsk_mgmt->task_tag);
1703                 return FAILED;
1704         }
1705 
1706         /* We need to find all commands for this LUN that have not yet been
1707          * responded to, and fail them with DID_RESET
1708          */
1709         spin_lock_irqsave(hostdata->host->host_lock, flags);
1710         list_for_each_entry_safe(tmp_evt, pos, &hostdata->sent, list) {
1711                 if ((tmp_evt->cmnd) && (tmp_evt->cmnd->device == cmd->device)) {
1712                         if (tmp_evt->cmnd)
1713                                 tmp_evt->cmnd->result = (DID_RESET << 16);
1714                         list_del(&tmp_evt->list);
1715                         unmap_cmd_data(&tmp_evt->iu.srp.cmd, tmp_evt,
1716                                        tmp_evt->hostdata->dev);
1717                         free_event_struct(&tmp_evt->hostdata->pool,
1718                                                    tmp_evt);
1719                         atomic_inc(&hostdata->request_limit);
1720                         if (tmp_evt->cmnd_done)
1721                                 tmp_evt->cmnd_done(tmp_evt->cmnd);
1722                         else if (tmp_evt->done)
1723                                 tmp_evt->done(tmp_evt);
1724                 }
1725         }
1726         spin_unlock_irqrestore(hostdata->host->host_lock, flags);
1727         return SUCCESS;
1728 }
1729 
1730 /**
1731  * ibmvscsi_eh_host_reset_handler - Reset the connection to the server
1732  * @cmd:        struct scsi_cmnd having problems
1733 */
1734 static int ibmvscsi_eh_host_reset_handler(struct scsi_cmnd *cmd)
1735 {
1736         unsigned long wait_switch = 0;
1737         struct ibmvscsi_host_data *hostdata = shost_priv(cmd->device->host);
1738 
1739         dev_err(hostdata->dev, "Resetting connection due to error recovery\n");
1740 
1741         ibmvscsi_reset_host(hostdata);
1742 
1743         for (wait_switch = jiffies + (init_timeout * HZ);
1744              time_before(jiffies, wait_switch) &&
1745                      atomic_read(&hostdata->request_limit) < 2;) {
1746 
1747                 msleep(10);
1748         }
1749 
1750         if (atomic_read(&hostdata->request_limit) <= 0)
1751                 return FAILED;
1752 
1753         return SUCCESS;
1754 }
1755 
1756 /**
1757  * ibmvscsi_handle_crq: - Handles and frees received events in the CRQ
1758  * @crq:        Command/Response queue
1759  * @hostdata:   ibmvscsi_host_data of host
1760  *
1761 */
1762 static void ibmvscsi_handle_crq(struct viosrp_crq *crq,
1763                                 struct ibmvscsi_host_data *hostdata)
1764 {
1765         long rc;
1766         unsigned long flags;
1767         /* The hypervisor copies our tag value here so no byteswapping */
1768         struct srp_event_struct *evt_struct =
1769                         (__force struct srp_event_struct *)crq->IU_data_ptr;
1770         switch (crq->valid) {
1771         case VIOSRP_CRQ_INIT_RSP:               /* initialization */
1772                 switch (crq->format) {
1773                 case VIOSRP_CRQ_INIT:   /* Initialization message */
1774                         dev_info(hostdata->dev, "partner initialized\n");
1775                         /* Send back a response */
1776                         rc = ibmvscsi_send_crq(hostdata, 0xC002000000000000LL, 0);
1777                         if (rc == 0) {
1778                                 /* Now login */
1779                                 init_adapter(hostdata);
1780                         } else {
1781                                 dev_err(hostdata->dev, "Unable to send init rsp. rc=%ld\n", rc);
1782                         }
1783 
1784                         break;
1785                 case VIOSRP_CRQ_INIT_COMPLETE:  /* Initialization response */
1786                         dev_info(hostdata->dev, "partner initialization complete\n");
1787 
1788                         /* Now login */
1789                         init_adapter(hostdata);
1790                         break;
1791                 default:
1792                         dev_err(hostdata->dev, "unknown crq message type: %d\n", crq->format);
1793                 }
1794                 return;
1795         case VIOSRP_CRQ_XPORT_EVENT:    /* Hypervisor telling us the connection is closed */
1796                 scsi_block_requests(hostdata->host);
1797                 atomic_set(&hostdata->request_limit, 0);
1798                 if (crq->format == 0x06) {
1799                         /* We need to re-setup the interpartition connection */
1800                         dev_info(hostdata->dev, "Re-enabling adapter!\n");
1801                         hostdata->client_migrated = 1;
1802                         hostdata->reenable_crq = 1;
1803                         purge_requests(hostdata, DID_REQUEUE);
1804                         wake_up(&hostdata->work_wait_q);
1805                 } else {
1806                         dev_err(hostdata->dev, "Virtual adapter failed rc %d!\n",
1807                                 crq->format);
1808                         ibmvscsi_reset_host(hostdata);
1809                 }
1810                 return;
1811         case VIOSRP_CRQ_CMD_RSP:                /* real payload */
1812                 break;
1813         default:
1814                 dev_err(hostdata->dev, "got an invalid message type 0x%02x\n",
1815                         crq->valid);
1816                 return;
1817         }
1818 
1819         /* The only kind of payload CRQs we should get are responses to
1820          * things we send. Make sure this response is to something we
1821          * actually sent
1822          */
1823         if (!valid_event_struct(&hostdata->pool, evt_struct)) {
1824                 dev_err(hostdata->dev, "returned correlation_token 0x%p is invalid!\n",
1825                        evt_struct);
1826                 return;
1827         }
1828 
1829         if (atomic_read(&evt_struct->free)) {
1830                 dev_err(hostdata->dev, "received duplicate correlation_token 0x%p!\n",
1831                         evt_struct);
1832                 return;
1833         }
1834 
1835         if (crq->format == VIOSRP_SRP_FORMAT)
1836                 atomic_add(be32_to_cpu(evt_struct->xfer_iu->srp.rsp.req_lim_delta),
1837                            &hostdata->request_limit);
1838 
1839         del_timer(&evt_struct->timer);
1840 
1841         if ((crq->status != VIOSRP_OK && crq->status != VIOSRP_OK2) && evt_struct->cmnd)
1842                 evt_struct->cmnd->result = DID_ERROR << 16;
1843         if (evt_struct->done)
1844                 evt_struct->done(evt_struct);
1845         else
1846                 dev_err(hostdata->dev, "returned done() is NULL; not running it!\n");
1847 
1848         /*
1849          * Lock the host_lock before messing with these structures, since we
1850          * are running in a task context
1851          */
1852         spin_lock_irqsave(evt_struct->hostdata->host->host_lock, flags);
1853         list_del(&evt_struct->list);
1854         free_event_struct(&evt_struct->hostdata->pool, evt_struct);
1855         spin_unlock_irqrestore(evt_struct->hostdata->host->host_lock, flags);
1856 }
1857 
1858 /**
1859  * ibmvscsi_slave_configure: Set the "allow_restart" flag for each disk.
1860  * @sdev:       struct scsi_device device to configure
1861  *
1862  * Enable allow_restart for a device if it is a disk.  Adjust the
1863  * queue_depth here also as is required by the documentation for
1864  * struct scsi_host_template.
1865  */
1866 static int ibmvscsi_slave_configure(struct scsi_device *sdev)
1867 {
1868         struct Scsi_Host *shost = sdev->host;
1869         unsigned long lock_flags = 0;
1870 
1871         spin_lock_irqsave(shost->host_lock, lock_flags);
1872         if (sdev->type == TYPE_DISK) {
1873                 sdev->allow_restart = 1;
1874                 blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
1875         }
1876         spin_unlock_irqrestore(shost->host_lock, lock_flags);
1877         return 0;
1878 }
1879 
1880 /**
1881  * ibmvscsi_change_queue_depth - Change the device's queue depth
1882  * @sdev:       scsi device struct
1883  * @qdepth:     depth to set
1884  * @reason:     calling context
1885  *
1886  * Return value:
1887  *      actual depth set
1888  **/
1889 static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
1890 {
1891         if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
1892                 qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
1893         return scsi_change_queue_depth(sdev, qdepth);
1894 }
1895 
1896 /* ------------------------------------------------------------
1897  * sysfs attributes
1898  */
1899 static ssize_t show_host_vhost_loc(struct device *dev,
1900                                    struct device_attribute *attr, char *buf)
1901 {
1902         struct Scsi_Host *shost = class_to_shost(dev);
1903         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1904         int len;
1905 
1906         len = snprintf(buf, sizeof(hostdata->caps.loc), "%s\n",
1907                        hostdata->caps.loc);
1908         return len;
1909 }
1910 
1911 static struct device_attribute ibmvscsi_host_vhost_loc = {
1912         .attr = {
1913                  .name = "vhost_loc",
1914                  .mode = S_IRUGO,
1915                  },
1916         .show = show_host_vhost_loc,
1917 };
1918 
1919 static ssize_t show_host_vhost_name(struct device *dev,
1920                                     struct device_attribute *attr, char *buf)
1921 {
1922         struct Scsi_Host *shost = class_to_shost(dev);
1923         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1924         int len;
1925 
1926         len = snprintf(buf, sizeof(hostdata->caps.name), "%s\n",
1927                        hostdata->caps.name);
1928         return len;
1929 }
1930 
1931 static struct device_attribute ibmvscsi_host_vhost_name = {
1932         .attr = {
1933                  .name = "vhost_name",
1934                  .mode = S_IRUGO,
1935                  },
1936         .show = show_host_vhost_name,
1937 };
1938 
1939 static ssize_t show_host_srp_version(struct device *dev,
1940                                      struct device_attribute *attr, char *buf)
1941 {
1942         struct Scsi_Host *shost = class_to_shost(dev);
1943         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1944         int len;
1945 
1946         len = snprintf(buf, PAGE_SIZE, "%s\n",
1947                        hostdata->madapter_info.srp_version);
1948         return len;
1949 }
1950 
1951 static struct device_attribute ibmvscsi_host_srp_version = {
1952         .attr = {
1953                  .name = "srp_version",
1954                  .mode = S_IRUGO,
1955                  },
1956         .show = show_host_srp_version,
1957 };
1958 
1959 static ssize_t show_host_partition_name(struct device *dev,
1960                                         struct device_attribute *attr,
1961                                         char *buf)
1962 {
1963         struct Scsi_Host *shost = class_to_shost(dev);
1964         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1965         int len;
1966 
1967         len = snprintf(buf, PAGE_SIZE, "%s\n",
1968                        hostdata->madapter_info.partition_name);
1969         return len;
1970 }
1971 
1972 static struct device_attribute ibmvscsi_host_partition_name = {
1973         .attr = {
1974                  .name = "partition_name",
1975                  .mode = S_IRUGO,
1976                  },
1977         .show = show_host_partition_name,
1978 };
1979 
1980 static ssize_t show_host_partition_number(struct device *dev,
1981                                           struct device_attribute *attr,
1982                                           char *buf)
1983 {
1984         struct Scsi_Host *shost = class_to_shost(dev);
1985         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
1986         int len;
1987 
1988         len = snprintf(buf, PAGE_SIZE, "%d\n",
1989                        be32_to_cpu(hostdata->madapter_info.partition_number));
1990         return len;
1991 }
1992 
1993 static struct device_attribute ibmvscsi_host_partition_number = {
1994         .attr = {
1995                  .name = "partition_number",
1996                  .mode = S_IRUGO,
1997                  },
1998         .show = show_host_partition_number,
1999 };
2000 
2001 static ssize_t show_host_mad_version(struct device *dev,
2002                                      struct device_attribute *attr, char *buf)
2003 {
2004         struct Scsi_Host *shost = class_to_shost(dev);
2005         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2006         int len;
2007 
2008         len = snprintf(buf, PAGE_SIZE, "%d\n",
2009                        be32_to_cpu(hostdata->madapter_info.mad_version));
2010         return len;
2011 }
2012 
2013 static struct device_attribute ibmvscsi_host_mad_version = {
2014         .attr = {
2015                  .name = "mad_version",
2016                  .mode = S_IRUGO,
2017                  },
2018         .show = show_host_mad_version,
2019 };
2020 
2021 static ssize_t show_host_os_type(struct device *dev,
2022                                  struct device_attribute *attr, char *buf)
2023 {
2024         struct Scsi_Host *shost = class_to_shost(dev);
2025         struct ibmvscsi_host_data *hostdata = shost_priv(shost);
2026         int len;
2027 
2028         len = snprintf(buf, PAGE_SIZE, "%d\n",
2029                        be32_to_cpu(hostdata->madapter_info.os_type));
2030         return len;
2031 }
2032 
2033 static struct device_attribute ibmvscsi_host_os_type = {
2034         .attr = {
2035                  .name = "os_type",
2036                  .mode = S_IRUGO,
2037                  },
2038         .show = show_host_os_type,
2039 };
2040 
2041 static ssize_t show_host_config(struct device *dev,
2042                                 struct device_attribute *attr, char *buf)
2043 {
2044         return 0;
2045 }
2046 
2047 static struct device_attribute ibmvscsi_host_config = {
2048         .attr = {
2049                 .name = "config",
2050                 .mode = S_IRUGO,
2051                 },
2052         .show = show_host_config,
2053 };
2054 
2055 static struct device_attribute *ibmvscsi_attrs[] = {
2056         &ibmvscsi_host_vhost_loc,
2057         &ibmvscsi_host_vhost_name,
2058         &ibmvscsi_host_srp_version,
2059         &ibmvscsi_host_partition_name,
2060         &ibmvscsi_host_partition_number,
2061         &ibmvscsi_host_mad_version,
2062         &ibmvscsi_host_os_type,
2063         &ibmvscsi_host_config,
2064         NULL
2065 };
2066 
2067 /* ------------------------------------------------------------
2068  * SCSI driver registration
2069  */
2070 static struct scsi_host_template driver_template = {
2071         .module = THIS_MODULE,
2072         .name = "IBM POWER Virtual SCSI Adapter " IBMVSCSI_VERSION,
2073         .proc_name = "ibmvscsi",
2074         .queuecommand = ibmvscsi_queuecommand,
2075         .eh_abort_handler = ibmvscsi_eh_abort_handler,
2076         .eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
2077         .eh_host_reset_handler = ibmvscsi_eh_host_reset_handler,
2078         .slave_configure = ibmvscsi_slave_configure,
2079         .change_queue_depth = ibmvscsi_change_queue_depth,
2080         .cmd_per_lun = IBMVSCSI_CMDS_PER_LUN_DEFAULT,
2081         .can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
2082         .this_id = -1,
2083         .sg_tablesize = SG_ALL,
2084         .use_clustering = ENABLE_CLUSTERING,
2085         .shost_attrs = ibmvscsi_attrs,
2086 };
2087 
2088 /**
2089  * ibmvscsi_get_desired_dma - Calculate IO memory desired by the driver
2090  *
2091  * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
2092  *
2093  * Return value:
2094  *      Number of bytes of IO data the driver will need to perform well.
2095  */
2096 static unsigned long ibmvscsi_get_desired_dma(struct vio_dev *vdev)
2097 {
2098         /* iu_storage data allocated in initialize_event_pool */
2099         unsigned long desired_io = max_events * sizeof(union viosrp_iu);
2100 
2101         /* add io space for sg data */
2102         desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
2103                              IBMVSCSI_CMDS_PER_LUN_DEFAULT);
2104 
2105         return desired_io;
2106 }
2107 
2108 static void ibmvscsi_do_work(struct ibmvscsi_host_data *hostdata)
2109 {
2110         int rc;
2111         char *action = "reset";
2112 
2113         if (hostdata->reset_crq) {
2114                 smp_rmb();
2115                 hostdata->reset_crq = 0;
2116 
2117                 rc = ibmvscsi_reset_crq_queue(&hostdata->queue, hostdata);
2118                 if (!rc)
2119                         rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2120                 vio_enable_interrupts(to_vio_dev(hostdata->dev));
2121         } else if (hostdata->reenable_crq) {
2122                 smp_rmb();
2123                 action = "enable";
2124                 rc = ibmvscsi_reenable_crq_queue(&hostdata->queue, hostdata);
2125                 hostdata->reenable_crq = 0;
2126                 if (!rc)
2127                         rc = ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0);
2128         } else
2129                 return;
2130 
2131         if (rc) {
2132                 atomic_set(&hostdata->request_limit, -1);
2133                 dev_err(hostdata->dev, "error after %s\n", action);
2134         }
2135 
2136         scsi_unblock_requests(hostdata->host);
2137 }
2138 
2139 static int ibmvscsi_work_to_do(struct ibmvscsi_host_data *hostdata)
2140 {
2141         if (kthread_should_stop())
2142                 return 1;
2143         else if (hostdata->reset_crq) {
2144                 smp_rmb();
2145                 return 1;
2146         } else if (hostdata->reenable_crq) {
2147                 smp_rmb();
2148                 return 1;
2149         }
2150 
2151         return 0;
2152 }
2153 
2154 static int ibmvscsi_work(void *data)
2155 {
2156         struct ibmvscsi_host_data *hostdata = data;
2157         int rc;
2158 
2159         set_user_nice(current, MIN_NICE);
2160 
2161         while (1) {
2162                 rc = wait_event_interruptible(hostdata->work_wait_q,
2163                                               ibmvscsi_work_to_do(hostdata));
2164 
2165                 BUG_ON(rc);
2166 
2167                 if (kthread_should_stop())
2168                         break;
2169 
2170                 ibmvscsi_do_work(hostdata);
2171         }
2172 
2173         return 0;
2174 }
2175 
2176 /**
2177  * Called by bus code for each adapter
2178  */
2179 static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
2180 {
2181         struct ibmvscsi_host_data *hostdata;
2182         struct Scsi_Host *host;
2183         struct device *dev = &vdev->dev;
2184         struct srp_rport_identifiers ids;
2185         struct srp_rport *rport;
2186         unsigned long wait_switch = 0;
2187         int rc;
2188 
2189         dev_set_drvdata(&vdev->dev, NULL);
2190 
2191         host = scsi_host_alloc(&driver_template, sizeof(*hostdata));
2192         if (!host) {
2193                 dev_err(&vdev->dev, "couldn't allocate host data\n");
2194                 goto scsi_host_alloc_failed;
2195         }
2196 
2197         host->transportt = ibmvscsi_transport_template;
2198         hostdata = shost_priv(host);
2199         memset(hostdata, 0x00, sizeof(*hostdata));
2200         INIT_LIST_HEAD(&hostdata->sent);
2201         init_waitqueue_head(&hostdata->work_wait_q);
2202         hostdata->host = host;
2203         hostdata->dev = dev;
2204         atomic_set(&hostdata->request_limit, -1);
2205         hostdata->host->max_sectors = IBMVSCSI_MAX_SECTORS_DEFAULT;
2206 
2207         if (map_persist_bufs(hostdata)) {
2208                 dev_err(&vdev->dev, "couldn't map persistent buffers\n");
2209                 goto persist_bufs_failed;
2210         }
2211 
2212         hostdata->work_thread = kthread_run(ibmvscsi_work, hostdata, "%s_%d",
2213                                             "ibmvscsi", host->host_no);
2214 
2215         if (IS_ERR(hostdata->work_thread)) {
2216                 dev_err(&vdev->dev, "couldn't initialize kthread. rc=%ld\n",
2217                         PTR_ERR(hostdata->work_thread));
2218                 goto init_crq_failed;
2219         }
2220 
2221         rc = ibmvscsi_init_crq_queue(&hostdata->queue, hostdata, max_events);
2222         if (rc != 0 && rc != H_RESOURCE) {
2223                 dev_err(&vdev->dev, "couldn't initialize crq. rc=%d\n", rc);
2224                 goto kill_kthread;
2225         }
2226         if (initialize_event_pool(&hostdata->pool, max_events, hostdata) != 0) {
2227                 dev_err(&vdev->dev, "couldn't initialize event pool\n");
2228                 goto init_pool_failed;
2229         }
2230 
2231         host->max_lun = IBMVSCSI_MAX_LUN;
2232         host->max_id = max_id;
2233         host->max_channel = max_channel;
2234         host->max_cmd_len = 16;
2235 
2236         dev_info(dev,
2237                  "Maximum ID: %d Maximum LUN: %llu Maximum Channel: %d\n",
2238                  host->max_id, host->max_lun, host->max_channel);
2239 
2240         if (scsi_add_host(hostdata->host, hostdata->dev))
2241                 goto add_host_failed;
2242 
2243         /* we don't have a proper target_port_id so let's use the fake one */
2244         memcpy(ids.port_id, hostdata->madapter_info.partition_name,
2245                sizeof(ids.port_id));
2246         ids.roles = SRP_RPORT_ROLE_TARGET;
2247         rport = srp_rport_add(host, &ids);
2248         if (IS_ERR(rport))
2249                 goto add_srp_port_failed;
2250 
2251         /* Try to send an initialization message.  Note that this is allowed
2252          * to fail if the other end is not acive.  In that case we don't
2253          * want to scan
2254          */
2255         if (ibmvscsi_send_crq(hostdata, 0xC001000000000000LL, 0) == 0
2256             || rc == H_RESOURCE) {
2257                 /*
2258                  * Wait around max init_timeout secs for the adapter to finish
2259                  * initializing. When we are done initializing, we will have a
2260                  * valid request_limit.  We don't want Linux scanning before
2261                  * we are ready.
2262                  */
2263                 for (wait_switch = jiffies + (init_timeout * HZ);
2264                      time_before(jiffies, wait_switch) &&
2265                      atomic_read(&hostdata->request_limit) < 2;) {
2266 
2267                         msleep(10);
2268                 }
2269 
2270                 /* if we now have a valid request_limit, initiate a scan */
2271                 if (atomic_read(&hostdata->request_limit) > 0)
2272                         scsi_scan_host(host);
2273         }
2274 
2275         dev_set_drvdata(&vdev->dev, hostdata);
2276         list_add_tail(&hostdata->host_list, &ibmvscsi_head);
2277         return 0;
2278 
2279       add_srp_port_failed:
2280         scsi_remove_host(hostdata->host);
2281       add_host_failed:
2282         release_event_pool(&hostdata->pool, hostdata);
2283       init_pool_failed:
2284         ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events);
2285       kill_kthread:
2286       kthread_stop(hostdata->work_thread);
2287       init_crq_failed:
2288         unmap_persist_bufs(hostdata);
2289       persist_bufs_failed:
2290         scsi_host_put(host);
2291       scsi_host_alloc_failed:
2292         return -1;
2293 }
2294 
2295 static int ibmvscsi_remove(struct vio_dev *vdev)
2296 {
2297         struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
2298         list_del(&hostdata->host_list);
2299         unmap_persist_bufs(hostdata);
2300         release_event_pool(&hostdata->pool, hostdata);
2301         ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,
2302                                         max_events);
2303 
2304         kthread_stop(hostdata->work_thread);
2305         srp_remove_host(hostdata->host);
2306         scsi_remove_host(hostdata->host);
2307         scsi_host_put(hostdata->host);
2308 
2309         return 0;
2310 }
2311 
2312 /**
2313  * ibmvscsi_resume: Resume from suspend
2314  * @dev:        device struct
2315  *
2316  * We may have lost an interrupt across suspend/resume, so kick the
2317  * interrupt handler
2318  */
2319 static int ibmvscsi_resume(struct device *dev)
2320 {
2321         struct ibmvscsi_host_data *hostdata = dev_get_drvdata(dev);
2322         vio_disable_interrupts(to_vio_dev(hostdata->dev));
2323         tasklet_schedule(&hostdata->srp_task);
2324 
2325         return 0;
2326 }
2327 
2328 /**
2329  * ibmvscsi_device_table: Used by vio.c to match devices in the device tree we 
2330  * support.
2331  */
2332 static struct vio_device_id ibmvscsi_device_table[] = {
2333         {"vscsi", "IBM,v-scsi"},
2334         { "", "" }
2335 };
2336 MODULE_DEVICE_TABLE(vio, ibmvscsi_device_table);
2337 
2338 static struct dev_pm_ops ibmvscsi_pm_ops = {
2339         .resume = ibmvscsi_resume
2340 };
2341 
2342 static struct vio_driver ibmvscsi_driver = {
2343         .id_table = ibmvscsi_device_table,
2344         .probe = ibmvscsi_probe,
2345         .remove = ibmvscsi_remove,
2346         .get_desired_dma = ibmvscsi_get_desired_dma,
2347         .name = "ibmvscsi",
2348         .pm = &ibmvscsi_pm_ops,
2349 };
2350 
2351 static struct srp_function_template ibmvscsi_transport_functions = {
2352 };
2353 
2354 int __init ibmvscsi_module_init(void)
2355 {
2356         int ret;
2357 
2358         /* Ensure we have two requests to do error recovery */
2359         driver_template.can_queue = max_requests;
2360         max_events = max_requests + 2;
2361 
2362         if (!firmware_has_feature(FW_FEATURE_VIO))
2363                 return -ENODEV;
2364 
2365         ibmvscsi_transport_template =
2366                 srp_attach_transport(&ibmvscsi_transport_functions);
2367         if (!ibmvscsi_transport_template)
2368                 return -ENOMEM;
2369 
2370         ret = vio_register_driver(&ibmvscsi_driver);
2371         if (ret)
2372                 srp_release_transport(ibmvscsi_transport_template);
2373         return ret;
2374 }
2375 
2376 void __exit ibmvscsi_module_exit(void)
2377 {
2378         vio_unregister_driver(&ibmvscsi_driver);
2379         srp_release_transport(ibmvscsi_transport_template);
2380 }
2381 
2382 module_init(ibmvscsi_module_init);
2383 module_exit(ibmvscsi_module_exit);
2384 

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