Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/infiniband/hw/qib/qib_init.c

  1 /*
  2  * Copyright (c) 2012, 2013 Intel Corporation.  All rights reserved.
  3  * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
  4  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
  5  *
  6  * This software is available to you under a choice of one of two
  7  * licenses.  You may choose to be licensed under the terms of the GNU
  8  * General Public License (GPL) Version 2, available from the file
  9  * COPYING in the main directory of this source tree, or the
 10  * OpenIB.org BSD license below:
 11  *
 12  *     Redistribution and use in source and binary forms, with or
 13  *     without modification, are permitted provided that the following
 14  *     conditions are met:
 15  *
 16  *      - Redistributions of source code must retain the above
 17  *        copyright notice, this list of conditions and the following
 18  *        disclaimer.
 19  *
 20  *      - Redistributions in binary form must reproduce the above
 21  *        copyright notice, this list of conditions and the following
 22  *        disclaimer in the documentation and/or other materials
 23  *        provided with the distribution.
 24  *
 25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 32  * SOFTWARE.
 33  */
 34 
 35 #include <linux/pci.h>
 36 #include <linux/netdevice.h>
 37 #include <linux/vmalloc.h>
 38 #include <linux/delay.h>
 39 #include <linux/idr.h>
 40 #include <linux/module.h>
 41 #include <linux/printk.h>
 42 #ifdef CONFIG_INFINIBAND_QIB_DCA
 43 #include <linux/dca.h>
 44 #endif
 45 
 46 #include "qib.h"
 47 #include "qib_common.h"
 48 #include "qib_mad.h"
 49 #ifdef CONFIG_DEBUG_FS
 50 #include "qib_debugfs.h"
 51 #include "qib_verbs.h"
 52 #endif
 53 
 54 #undef pr_fmt
 55 #define pr_fmt(fmt) QIB_DRV_NAME ": " fmt
 56 
 57 /*
 58  * min buffers we want to have per context, after driver
 59  */
 60 #define QIB_MIN_USER_CTXT_BUFCNT 7
 61 
 62 #define QLOGIC_IB_R_SOFTWARE_MASK 0xFF
 63 #define QLOGIC_IB_R_SOFTWARE_SHIFT 24
 64 #define QLOGIC_IB_R_EMULATOR_MASK (1ULL<<62)
 65 
 66 /*
 67  * Number of ctxts we are configured to use (to allow for more pio
 68  * buffers per ctxt, etc.)  Zero means use chip value.
 69  */
 70 ushort qib_cfgctxts;
 71 module_param_named(cfgctxts, qib_cfgctxts, ushort, S_IRUGO);
 72 MODULE_PARM_DESC(cfgctxts, "Set max number of contexts to use");
 73 
 74 unsigned qib_numa_aware;
 75 module_param_named(numa_aware, qib_numa_aware, uint, S_IRUGO);
 76 MODULE_PARM_DESC(numa_aware,
 77         "0 -> PSM allocation close to HCA, 1 -> PSM allocation local to process");
 78 
 79 /*
 80  * If set, do not write to any regs if avoidable, hack to allow
 81  * check for deranged default register values.
 82  */
 83 ushort qib_mini_init;
 84 module_param_named(mini_init, qib_mini_init, ushort, S_IRUGO);
 85 MODULE_PARM_DESC(mini_init, "If set, do minimal diag init");
 86 
 87 unsigned qib_n_krcv_queues;
 88 module_param_named(krcvqs, qib_n_krcv_queues, uint, S_IRUGO);
 89 MODULE_PARM_DESC(krcvqs, "number of kernel receive queues per IB port");
 90 
 91 unsigned qib_cc_table_size;
 92 module_param_named(cc_table_size, qib_cc_table_size, uint, S_IRUGO);
 93 MODULE_PARM_DESC(cc_table_size, "Congestion control table entries 0 (CCA disabled - default), min = 128, max = 1984");
 94 
 95 static void verify_interrupt(unsigned long);
 96 
 97 static struct idr qib_unit_table;
 98 u32 qib_cpulist_count;
 99 unsigned long *qib_cpulist;
100 
101 /* set number of contexts we'll actually use */
102 void qib_set_ctxtcnt(struct qib_devdata *dd)
103 {
104         if (!qib_cfgctxts) {
105                 dd->cfgctxts = dd->first_user_ctxt + num_online_cpus();
106                 if (dd->cfgctxts > dd->ctxtcnt)
107                         dd->cfgctxts = dd->ctxtcnt;
108         } else if (qib_cfgctxts < dd->num_pports)
109                 dd->cfgctxts = dd->ctxtcnt;
110         else if (qib_cfgctxts <= dd->ctxtcnt)
111                 dd->cfgctxts = qib_cfgctxts;
112         else
113                 dd->cfgctxts = dd->ctxtcnt;
114         dd->freectxts = (dd->first_user_ctxt > dd->cfgctxts) ? 0 :
115                 dd->cfgctxts - dd->first_user_ctxt;
116 }
117 
118 /*
119  * Common code for creating the receive context array.
120  */
121 int qib_create_ctxts(struct qib_devdata *dd)
122 {
123         unsigned i;
124         int local_node_id = pcibus_to_node(dd->pcidev->bus);
125 
126         if (local_node_id < 0)
127                 local_node_id = numa_node_id();
128         dd->assigned_node_id = local_node_id;
129 
130         /*
131          * Allocate full ctxtcnt array, rather than just cfgctxts, because
132          * cleanup iterates across all possible ctxts.
133          */
134         dd->rcd = kcalloc(dd->ctxtcnt, sizeof(*dd->rcd), GFP_KERNEL);
135         if (!dd->rcd) {
136                 qib_dev_err(dd,
137                         "Unable to allocate ctxtdata array, failing\n");
138                 return -ENOMEM;
139         }
140 
141         /* create (one or more) kctxt */
142         for (i = 0; i < dd->first_user_ctxt; ++i) {
143                 struct qib_pportdata *ppd;
144                 struct qib_ctxtdata *rcd;
145 
146                 if (dd->skip_kctxt_mask & (1 << i))
147                         continue;
148 
149                 ppd = dd->pport + (i % dd->num_pports);
150 
151                 rcd = qib_create_ctxtdata(ppd, i, dd->assigned_node_id);
152                 if (!rcd) {
153                         qib_dev_err(dd,
154                                 "Unable to allocate ctxtdata for Kernel ctxt, failing\n");
155                         kfree(dd->rcd);
156                         dd->rcd = NULL;
157                         return -ENOMEM;
158                 }
159                 rcd->pkeys[0] = QIB_DEFAULT_P_KEY;
160                 rcd->seq_cnt = 1;
161         }
162         return 0;
163 }
164 
165 /*
166  * Common code for user and kernel context setup.
167  */
168 struct qib_ctxtdata *qib_create_ctxtdata(struct qib_pportdata *ppd, u32 ctxt,
169         int node_id)
170 {
171         struct qib_devdata *dd = ppd->dd;
172         struct qib_ctxtdata *rcd;
173 
174         rcd = kzalloc_node(sizeof(*rcd), GFP_KERNEL, node_id);
175         if (rcd) {
176                 INIT_LIST_HEAD(&rcd->qp_wait_list);
177                 rcd->node_id = node_id;
178                 rcd->ppd = ppd;
179                 rcd->dd = dd;
180                 rcd->cnt = 1;
181                 rcd->ctxt = ctxt;
182                 dd->rcd[ctxt] = rcd;
183 #ifdef CONFIG_DEBUG_FS
184                 if (ctxt < dd->first_user_ctxt) { /* N/A for PSM contexts */
185                         rcd->opstats = kzalloc_node(sizeof(*rcd->opstats),
186                                 GFP_KERNEL, node_id);
187                         if (!rcd->opstats) {
188                                 kfree(rcd);
189                                 qib_dev_err(dd,
190                                         "Unable to allocate per ctxt stats buffer\n");
191                                 return NULL;
192                         }
193                 }
194 #endif
195                 dd->f_init_ctxt(rcd);
196 
197                 /*
198                  * To avoid wasting a lot of memory, we allocate 32KB chunks
199                  * of physically contiguous memory, advance through it until
200                  * used up and then allocate more.  Of course, we need
201                  * memory to store those extra pointers, now.  32KB seems to
202                  * be the most that is "safe" under memory pressure
203                  * (creating large files and then copying them over
204                  * NFS while doing lots of MPI jobs).  The OOM killer can
205                  * get invoked, even though we say we can sleep and this can
206                  * cause significant system problems....
207                  */
208                 rcd->rcvegrbuf_size = 0x8000;
209                 rcd->rcvegrbufs_perchunk =
210                         rcd->rcvegrbuf_size / dd->rcvegrbufsize;
211                 rcd->rcvegrbuf_chunks = (rcd->rcvegrcnt +
212                         rcd->rcvegrbufs_perchunk - 1) /
213                         rcd->rcvegrbufs_perchunk;
214                 BUG_ON(!is_power_of_2(rcd->rcvegrbufs_perchunk));
215                 rcd->rcvegrbufs_perchunk_shift =
216                         ilog2(rcd->rcvegrbufs_perchunk);
217         }
218         return rcd;
219 }
220 
221 /*
222  * Common code for initializing the physical port structure.
223  */
224 int qib_init_pportdata(struct qib_pportdata *ppd, struct qib_devdata *dd,
225                         u8 hw_pidx, u8 port)
226 {
227         int size;
228 
229         ppd->dd = dd;
230         ppd->hw_pidx = hw_pidx;
231         ppd->port = port; /* IB port number, not index */
232 
233         spin_lock_init(&ppd->sdma_lock);
234         spin_lock_init(&ppd->lflags_lock);
235         spin_lock_init(&ppd->cc_shadow_lock);
236         init_waitqueue_head(&ppd->state_wait);
237 
238         init_timer(&ppd->symerr_clear_timer);
239         ppd->symerr_clear_timer.function = qib_clear_symerror_on_linkup;
240         ppd->symerr_clear_timer.data = (unsigned long)ppd;
241 
242         ppd->qib_wq = NULL;
243         ppd->ibport_data.pmastats =
244                 alloc_percpu(struct qib_pma_counters);
245         if (!ppd->ibport_data.pmastats)
246                 return -ENOMEM;
247 
248         if (qib_cc_table_size < IB_CCT_MIN_ENTRIES)
249                 goto bail;
250 
251         ppd->cc_supported_table_entries = min(max_t(int, qib_cc_table_size,
252                 IB_CCT_MIN_ENTRIES), IB_CCT_ENTRIES*IB_CC_TABLE_CAP_DEFAULT);
253 
254         ppd->cc_max_table_entries =
255                 ppd->cc_supported_table_entries/IB_CCT_ENTRIES;
256 
257         size = IB_CC_TABLE_CAP_DEFAULT * sizeof(struct ib_cc_table_entry)
258                 * IB_CCT_ENTRIES;
259         ppd->ccti_entries = kzalloc(size, GFP_KERNEL);
260         if (!ppd->ccti_entries) {
261                 qib_dev_err(dd,
262                   "failed to allocate congestion control table for port %d!\n",
263                   port);
264                 goto bail;
265         }
266 
267         size = IB_CC_CCS_ENTRIES * sizeof(struct ib_cc_congestion_entry);
268         ppd->congestion_entries = kzalloc(size, GFP_KERNEL);
269         if (!ppd->congestion_entries) {
270                 qib_dev_err(dd,
271                  "failed to allocate congestion setting list for port %d!\n",
272                  port);
273                 goto bail_1;
274         }
275 
276         size = sizeof(struct cc_table_shadow);
277         ppd->ccti_entries_shadow = kzalloc(size, GFP_KERNEL);
278         if (!ppd->ccti_entries_shadow) {
279                 qib_dev_err(dd,
280                  "failed to allocate shadow ccti list for port %d!\n",
281                  port);
282                 goto bail_2;
283         }
284 
285         size = sizeof(struct ib_cc_congestion_setting_attr);
286         ppd->congestion_entries_shadow = kzalloc(size, GFP_KERNEL);
287         if (!ppd->congestion_entries_shadow) {
288                 qib_dev_err(dd,
289                  "failed to allocate shadow congestion setting list for port %d!\n",
290                  port);
291                 goto bail_3;
292         }
293 
294         return 0;
295 
296 bail_3:
297         kfree(ppd->ccti_entries_shadow);
298         ppd->ccti_entries_shadow = NULL;
299 bail_2:
300         kfree(ppd->congestion_entries);
301         ppd->congestion_entries = NULL;
302 bail_1:
303         kfree(ppd->ccti_entries);
304         ppd->ccti_entries = NULL;
305 bail:
306         /* User is intentionally disabling the congestion control agent */
307         if (!qib_cc_table_size)
308                 return 0;
309 
310         if (qib_cc_table_size < IB_CCT_MIN_ENTRIES) {
311                 qib_cc_table_size = 0;
312                 qib_dev_err(dd,
313                  "Congestion Control table size %d less than minimum %d for port %d\n",
314                  qib_cc_table_size, IB_CCT_MIN_ENTRIES, port);
315         }
316 
317         qib_dev_err(dd, "Congestion Control Agent disabled for port %d\n",
318                 port);
319         return 0;
320 }
321 
322 static int init_pioavailregs(struct qib_devdata *dd)
323 {
324         int ret, pidx;
325         u64 *status_page;
326 
327         dd->pioavailregs_dma = dma_alloc_coherent(
328                 &dd->pcidev->dev, PAGE_SIZE, &dd->pioavailregs_phys,
329                 GFP_KERNEL);
330         if (!dd->pioavailregs_dma) {
331                 qib_dev_err(dd,
332                         "failed to allocate PIOavail reg area in memory\n");
333                 ret = -ENOMEM;
334                 goto done;
335         }
336 
337         /*
338          * We really want L2 cache aligned, but for current CPUs of
339          * interest, they are the same.
340          */
341         status_page = (u64 *)
342                 ((char *) dd->pioavailregs_dma +
343                  ((2 * L1_CACHE_BYTES +
344                    dd->pioavregs * sizeof(u64)) & ~L1_CACHE_BYTES));
345         /* device status comes first, for backwards compatibility */
346         dd->devstatusp = status_page;
347         *status_page++ = 0;
348         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
349                 dd->pport[pidx].statusp = status_page;
350                 *status_page++ = 0;
351         }
352 
353         /*
354          * Setup buffer to hold freeze and other messages, accessible to
355          * apps, following statusp.  This is per-unit, not per port.
356          */
357         dd->freezemsg = (char *) status_page;
358         *dd->freezemsg = 0;
359         /* length of msg buffer is "whatever is left" */
360         ret = (char *) status_page - (char *) dd->pioavailregs_dma;
361         dd->freezelen = PAGE_SIZE - ret;
362 
363         ret = 0;
364 
365 done:
366         return ret;
367 }
368 
369 /**
370  * init_shadow_tids - allocate the shadow TID array
371  * @dd: the qlogic_ib device
372  *
373  * allocate the shadow TID array, so we can qib_munlock previous
374  * entries.  It may make more sense to move the pageshadow to the
375  * ctxt data structure, so we only allocate memory for ctxts actually
376  * in use, since we at 8k per ctxt, now.
377  * We don't want failures here to prevent use of the driver/chip,
378  * so no return value.
379  */
380 static void init_shadow_tids(struct qib_devdata *dd)
381 {
382         struct page **pages;
383         dma_addr_t *addrs;
384 
385         pages = vzalloc(dd->cfgctxts * dd->rcvtidcnt * sizeof(struct page *));
386         if (!pages) {
387                 qib_dev_err(dd,
388                         "failed to allocate shadow page * array, no expected sends!\n");
389                 goto bail;
390         }
391 
392         addrs = vzalloc(dd->cfgctxts * dd->rcvtidcnt * sizeof(dma_addr_t));
393         if (!addrs) {
394                 qib_dev_err(dd,
395                         "failed to allocate shadow dma handle array, no expected sends!\n");
396                 goto bail_free;
397         }
398 
399         dd->pageshadow = pages;
400         dd->physshadow = addrs;
401         return;
402 
403 bail_free:
404         vfree(pages);
405 bail:
406         dd->pageshadow = NULL;
407 }
408 
409 /*
410  * Do initialization for device that is only needed on
411  * first detect, not on resets.
412  */
413 static int loadtime_init(struct qib_devdata *dd)
414 {
415         int ret = 0;
416 
417         if (((dd->revision >> QLOGIC_IB_R_SOFTWARE_SHIFT) &
418              QLOGIC_IB_R_SOFTWARE_MASK) != QIB_CHIP_SWVERSION) {
419                 qib_dev_err(dd,
420                         "Driver only handles version %d, chip swversion is %d (%llx), failng\n",
421                         QIB_CHIP_SWVERSION,
422                         (int)(dd->revision >>
423                                 QLOGIC_IB_R_SOFTWARE_SHIFT) &
424                                 QLOGIC_IB_R_SOFTWARE_MASK,
425                         (unsigned long long) dd->revision);
426                 ret = -ENOSYS;
427                 goto done;
428         }
429 
430         if (dd->revision & QLOGIC_IB_R_EMULATOR_MASK)
431                 qib_devinfo(dd->pcidev, "%s", dd->boardversion);
432 
433         spin_lock_init(&dd->pioavail_lock);
434         spin_lock_init(&dd->sendctrl_lock);
435         spin_lock_init(&dd->uctxt_lock);
436         spin_lock_init(&dd->qib_diag_trans_lock);
437         spin_lock_init(&dd->eep_st_lock);
438         mutex_init(&dd->eep_lock);
439 
440         if (qib_mini_init)
441                 goto done;
442 
443         ret = init_pioavailregs(dd);
444         init_shadow_tids(dd);
445 
446         qib_get_eeprom_info(dd);
447 
448         /* setup time (don't start yet) to verify we got interrupt */
449         init_timer(&dd->intrchk_timer);
450         dd->intrchk_timer.function = verify_interrupt;
451         dd->intrchk_timer.data = (unsigned long) dd;
452 
453         ret = qib_cq_init(dd);
454 done:
455         return ret;
456 }
457 
458 /**
459  * init_after_reset - re-initialize after a reset
460  * @dd: the qlogic_ib device
461  *
462  * sanity check at least some of the values after reset, and
463  * ensure no receive or transmit (explicitly, in case reset
464  * failed
465  */
466 static int init_after_reset(struct qib_devdata *dd)
467 {
468         int i;
469 
470         /*
471          * Ensure chip does no sends or receives, tail updates, or
472          * pioavail updates while we re-initialize.  This is mostly
473          * for the driver data structures, not chip registers.
474          */
475         for (i = 0; i < dd->num_pports; ++i) {
476                 /*
477                  * ctxt == -1 means "all contexts". Only really safe for
478                  * _dis_abling things, as here.
479                  */
480                 dd->f_rcvctrl(dd->pport + i, QIB_RCVCTRL_CTXT_DIS |
481                                   QIB_RCVCTRL_INTRAVAIL_DIS |
482                                   QIB_RCVCTRL_TAILUPD_DIS, -1);
483                 /* Redundant across ports for some, but no big deal.  */
484                 dd->f_sendctrl(dd->pport + i, QIB_SENDCTRL_SEND_DIS |
485                         QIB_SENDCTRL_AVAIL_DIS);
486         }
487 
488         return 0;
489 }
490 
491 static void enable_chip(struct qib_devdata *dd)
492 {
493         u64 rcvmask;
494         int i;
495 
496         /*
497          * Enable PIO send, and update of PIOavail regs to memory.
498          */
499         for (i = 0; i < dd->num_pports; ++i)
500                 dd->f_sendctrl(dd->pport + i, QIB_SENDCTRL_SEND_ENB |
501                         QIB_SENDCTRL_AVAIL_ENB);
502         /*
503          * Enable kernel ctxts' receive and receive interrupt.
504          * Other ctxts done as user opens and inits them.
505          */
506         rcvmask = QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_INTRAVAIL_ENB;
507         rcvmask |= (dd->flags & QIB_NODMA_RTAIL) ?
508                   QIB_RCVCTRL_TAILUPD_DIS : QIB_RCVCTRL_TAILUPD_ENB;
509         for (i = 0; dd->rcd && i < dd->first_user_ctxt; ++i) {
510                 struct qib_ctxtdata *rcd = dd->rcd[i];
511 
512                 if (rcd)
513                         dd->f_rcvctrl(rcd->ppd, rcvmask, i);
514         }
515 }
516 
517 static void verify_interrupt(unsigned long opaque)
518 {
519         struct qib_devdata *dd = (struct qib_devdata *) opaque;
520         u64 int_counter;
521 
522         if (!dd)
523                 return; /* being torn down */
524 
525         /*
526          * If we don't have a lid or any interrupts, let the user know and
527          * don't bother checking again.
528          */
529         int_counter = qib_int_counter(dd) - dd->z_int_counter;
530         if (int_counter == 0) {
531                 if (!dd->f_intr_fallback(dd))
532                         dev_err(&dd->pcidev->dev,
533                                 "No interrupts detected, not usable.\n");
534                 else /* re-arm the timer to see if fallback works */
535                         mod_timer(&dd->intrchk_timer, jiffies + HZ/2);
536         }
537 }
538 
539 static void init_piobuf_state(struct qib_devdata *dd)
540 {
541         int i, pidx;
542         u32 uctxts;
543 
544         /*
545          * Ensure all buffers are free, and fifos empty.  Buffers
546          * are common, so only do once for port 0.
547          *
548          * After enable and qib_chg_pioavailkernel so we can safely
549          * enable pioavail updates and PIOENABLE.  After this, packets
550          * are ready and able to go out.
551          */
552         dd->f_sendctrl(dd->pport, QIB_SENDCTRL_DISARM_ALL);
553         for (pidx = 0; pidx < dd->num_pports; ++pidx)
554                 dd->f_sendctrl(dd->pport + pidx, QIB_SENDCTRL_FLUSH);
555 
556         /*
557          * If not all sendbufs are used, add the one to each of the lower
558          * numbered contexts.  pbufsctxt and lastctxt_piobuf are
559          * calculated in chip-specific code because it may cause some
560          * chip-specific adjustments to be made.
561          */
562         uctxts = dd->cfgctxts - dd->first_user_ctxt;
563         dd->ctxts_extrabuf = dd->pbufsctxt ?
564                 dd->lastctxt_piobuf - (dd->pbufsctxt * uctxts) : 0;
565 
566         /*
567          * Set up the shadow copies of the piobufavail registers,
568          * which we compare against the chip registers for now, and
569          * the in memory DMA'ed copies of the registers.
570          * By now pioavail updates to memory should have occurred, so
571          * copy them into our working/shadow registers; this is in
572          * case something went wrong with abort, but mostly to get the
573          * initial values of the generation bit correct.
574          */
575         for (i = 0; i < dd->pioavregs; i++) {
576                 __le64 tmp;
577 
578                 tmp = dd->pioavailregs_dma[i];
579                 /*
580                  * Don't need to worry about pioavailkernel here
581                  * because we will call qib_chg_pioavailkernel() later
582                  * in initialization, to busy out buffers as needed.
583                  */
584                 dd->pioavailshadow[i] = le64_to_cpu(tmp);
585         }
586         while (i < ARRAY_SIZE(dd->pioavailshadow))
587                 dd->pioavailshadow[i++] = 0; /* for debugging sanity */
588 
589         /* after pioavailshadow is setup */
590         qib_chg_pioavailkernel(dd, 0, dd->piobcnt2k + dd->piobcnt4k,
591                                TXCHK_CHG_TYPE_KERN, NULL);
592         dd->f_initvl15_bufs(dd);
593 }
594 
595 /**
596  * qib_create_workqueues - create per port workqueues
597  * @dd: the qlogic_ib device
598  */
599 static int qib_create_workqueues(struct qib_devdata *dd)
600 {
601         int pidx;
602         struct qib_pportdata *ppd;
603 
604         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
605                 ppd = dd->pport + pidx;
606                 if (!ppd->qib_wq) {
607                         char wq_name[8]; /* 3 + 2 + 1 + 1 + 1 */
608 
609                         snprintf(wq_name, sizeof(wq_name), "qib%d_%d",
610                                 dd->unit, pidx);
611                         ppd->qib_wq =
612                                 create_singlethread_workqueue(wq_name);
613                         if (!ppd->qib_wq)
614                                 goto wq_error;
615                 }
616         }
617         return 0;
618 wq_error:
619         pr_err("create_singlethread_workqueue failed for port %d\n",
620                 pidx + 1);
621         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
622                 ppd = dd->pport + pidx;
623                 if (ppd->qib_wq) {
624                         destroy_workqueue(ppd->qib_wq);
625                         ppd->qib_wq = NULL;
626                 }
627         }
628         return -ENOMEM;
629 }
630 
631 static void qib_free_pportdata(struct qib_pportdata *ppd)
632 {
633         free_percpu(ppd->ibport_data.pmastats);
634         ppd->ibport_data.pmastats = NULL;
635 }
636 
637 /**
638  * qib_init - do the actual initialization sequence on the chip
639  * @dd: the qlogic_ib device
640  * @reinit: reinitializing, so don't allocate new memory
641  *
642  * Do the actual initialization sequence on the chip.  This is done
643  * both from the init routine called from the PCI infrastructure, and
644  * when we reset the chip, or detect that it was reset internally,
645  * or it's administratively re-enabled.
646  *
647  * Memory allocation here and in called routines is only done in
648  * the first case (reinit == 0).  We have to be careful, because even
649  * without memory allocation, we need to re-write all the chip registers
650  * TIDs, etc. after the reset or enable has completed.
651  */
652 int qib_init(struct qib_devdata *dd, int reinit)
653 {
654         int ret = 0, pidx, lastfail = 0;
655         u32 portok = 0;
656         unsigned i;
657         struct qib_ctxtdata *rcd;
658         struct qib_pportdata *ppd;
659         unsigned long flags;
660 
661         /* Set linkstate to unknown, so we can watch for a transition. */
662         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
663                 ppd = dd->pport + pidx;
664                 spin_lock_irqsave(&ppd->lflags_lock, flags);
665                 ppd->lflags &= ~(QIBL_LINKACTIVE | QIBL_LINKARMED |
666                                  QIBL_LINKDOWN | QIBL_LINKINIT |
667                                  QIBL_LINKV);
668                 spin_unlock_irqrestore(&ppd->lflags_lock, flags);
669         }
670 
671         if (reinit)
672                 ret = init_after_reset(dd);
673         else
674                 ret = loadtime_init(dd);
675         if (ret)
676                 goto done;
677 
678         /* Bypass most chip-init, to get to device creation */
679         if (qib_mini_init)
680                 return 0;
681 
682         ret = dd->f_late_initreg(dd);
683         if (ret)
684                 goto done;
685 
686         /* dd->rcd can be NULL if early init failed */
687         for (i = 0; dd->rcd && i < dd->first_user_ctxt; ++i) {
688                 /*
689                  * Set up the (kernel) rcvhdr queue and egr TIDs.  If doing
690                  * re-init, the simplest way to handle this is to free
691                  * existing, and re-allocate.
692                  * Need to re-create rest of ctxt 0 ctxtdata as well.
693                  */
694                 rcd = dd->rcd[i];
695                 if (!rcd)
696                         continue;
697 
698                 lastfail = qib_create_rcvhdrq(dd, rcd);
699                 if (!lastfail)
700                         lastfail = qib_setup_eagerbufs(rcd);
701                 if (lastfail) {
702                         qib_dev_err(dd,
703                                 "failed to allocate kernel ctxt's rcvhdrq and/or egr bufs\n");
704                         continue;
705                 }
706         }
707 
708         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
709                 int mtu;
710 
711                 if (lastfail)
712                         ret = lastfail;
713                 ppd = dd->pport + pidx;
714                 mtu = ib_mtu_enum_to_int(qib_ibmtu);
715                 if (mtu == -1) {
716                         mtu = QIB_DEFAULT_MTU;
717                         qib_ibmtu = 0; /* don't leave invalid value */
718                 }
719                 /* set max we can ever have for this driver load */
720                 ppd->init_ibmaxlen = min(mtu > 2048 ?
721                                          dd->piosize4k : dd->piosize2k,
722                                          dd->rcvegrbufsize +
723                                          (dd->rcvhdrentsize << 2));
724                 /*
725                  * Have to initialize ibmaxlen, but this will normally
726                  * change immediately in qib_set_mtu().
727                  */
728                 ppd->ibmaxlen = ppd->init_ibmaxlen;
729                 qib_set_mtu(ppd, mtu);
730 
731                 spin_lock_irqsave(&ppd->lflags_lock, flags);
732                 ppd->lflags |= QIBL_IB_LINK_DISABLED;
733                 spin_unlock_irqrestore(&ppd->lflags_lock, flags);
734 
735                 lastfail = dd->f_bringup_serdes(ppd);
736                 if (lastfail) {
737                         qib_devinfo(dd->pcidev,
738                                  "Failed to bringup IB port %u\n", ppd->port);
739                         lastfail = -ENETDOWN;
740                         continue;
741                 }
742 
743                 portok++;
744         }
745 
746         if (!portok) {
747                 /* none of the ports initialized */
748                 if (!ret && lastfail)
749                         ret = lastfail;
750                 else if (!ret)
751                         ret = -ENETDOWN;
752                 /* but continue on, so we can debug cause */
753         }
754 
755         enable_chip(dd);
756 
757         init_piobuf_state(dd);
758 
759 done:
760         if (!ret) {
761                 /* chip is OK for user apps; mark it as initialized */
762                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
763                         ppd = dd->pport + pidx;
764                         /*
765                          * Set status even if port serdes is not initialized
766                          * so that diags will work.
767                          */
768                         *ppd->statusp |= QIB_STATUS_CHIP_PRESENT |
769                                 QIB_STATUS_INITTED;
770                         if (!ppd->link_speed_enabled)
771                                 continue;
772                         if (dd->flags & QIB_HAS_SEND_DMA)
773                                 ret = qib_setup_sdma(ppd);
774                         init_timer(&ppd->hol_timer);
775                         ppd->hol_timer.function = qib_hol_event;
776                         ppd->hol_timer.data = (unsigned long)ppd;
777                         ppd->hol_state = QIB_HOL_UP;
778                 }
779 
780                 /* now we can enable all interrupts from the chip */
781                 dd->f_set_intr_state(dd, 1);
782 
783                 /*
784                  * Setup to verify we get an interrupt, and fallback
785                  * to an alternate if necessary and possible.
786                  */
787                 mod_timer(&dd->intrchk_timer, jiffies + HZ/2);
788                 /* start stats retrieval timer */
789                 mod_timer(&dd->stats_timer, jiffies + HZ * ACTIVITY_TIMER);
790         }
791 
792         /* if ret is non-zero, we probably should do some cleanup here... */
793         return ret;
794 }
795 
796 /*
797  * These next two routines are placeholders in case we don't have per-arch
798  * code for controlling write combining.  If explicit control of write
799  * combining is not available, performance will probably be awful.
800  */
801 
802 int __attribute__((weak)) qib_enable_wc(struct qib_devdata *dd)
803 {
804         return -EOPNOTSUPP;
805 }
806 
807 void __attribute__((weak)) qib_disable_wc(struct qib_devdata *dd)
808 {
809 }
810 
811 static inline struct qib_devdata *__qib_lookup(int unit)
812 {
813         return idr_find(&qib_unit_table, unit);
814 }
815 
816 struct qib_devdata *qib_lookup(int unit)
817 {
818         struct qib_devdata *dd;
819         unsigned long flags;
820 
821         spin_lock_irqsave(&qib_devs_lock, flags);
822         dd = __qib_lookup(unit);
823         spin_unlock_irqrestore(&qib_devs_lock, flags);
824 
825         return dd;
826 }
827 
828 /*
829  * Stop the timers during unit shutdown, or after an error late
830  * in initialization.
831  */
832 static void qib_stop_timers(struct qib_devdata *dd)
833 {
834         struct qib_pportdata *ppd;
835         int pidx;
836 
837         if (dd->stats_timer.data) {
838                 del_timer_sync(&dd->stats_timer);
839                 dd->stats_timer.data = 0;
840         }
841         if (dd->intrchk_timer.data) {
842                 del_timer_sync(&dd->intrchk_timer);
843                 dd->intrchk_timer.data = 0;
844         }
845         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
846                 ppd = dd->pport + pidx;
847                 if (ppd->hol_timer.data)
848                         del_timer_sync(&ppd->hol_timer);
849                 if (ppd->led_override_timer.data) {
850                         del_timer_sync(&ppd->led_override_timer);
851                         atomic_set(&ppd->led_override_timer_active, 0);
852                 }
853                 if (ppd->symerr_clear_timer.data)
854                         del_timer_sync(&ppd->symerr_clear_timer);
855         }
856 }
857 
858 /**
859  * qib_shutdown_device - shut down a device
860  * @dd: the qlogic_ib device
861  *
862  * This is called to make the device quiet when we are about to
863  * unload the driver, and also when the device is administratively
864  * disabled.   It does not free any data structures.
865  * Everything it does has to be setup again by qib_init(dd, 1)
866  */
867 static void qib_shutdown_device(struct qib_devdata *dd)
868 {
869         struct qib_pportdata *ppd;
870         unsigned pidx;
871 
872         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
873                 ppd = dd->pport + pidx;
874 
875                 spin_lock_irq(&ppd->lflags_lock);
876                 ppd->lflags &= ~(QIBL_LINKDOWN | QIBL_LINKINIT |
877                                  QIBL_LINKARMED | QIBL_LINKACTIVE |
878                                  QIBL_LINKV);
879                 spin_unlock_irq(&ppd->lflags_lock);
880                 *ppd->statusp &= ~(QIB_STATUS_IB_CONF | QIB_STATUS_IB_READY);
881         }
882         dd->flags &= ~QIB_INITTED;
883 
884         /* mask interrupts, but not errors */
885         dd->f_set_intr_state(dd, 0);
886 
887         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
888                 ppd = dd->pport + pidx;
889                 dd->f_rcvctrl(ppd, QIB_RCVCTRL_TAILUPD_DIS |
890                                    QIB_RCVCTRL_CTXT_DIS |
891                                    QIB_RCVCTRL_INTRAVAIL_DIS |
892                                    QIB_RCVCTRL_PKEY_ENB, -1);
893                 /*
894                  * Gracefully stop all sends allowing any in progress to
895                  * trickle out first.
896                  */
897                 dd->f_sendctrl(ppd, QIB_SENDCTRL_CLEAR);
898         }
899 
900         /*
901          * Enough for anything that's going to trickle out to have actually
902          * done so.
903          */
904         udelay(20);
905 
906         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
907                 ppd = dd->pport + pidx;
908                 dd->f_setextled(ppd, 0); /* make sure LEDs are off */
909 
910                 if (dd->flags & QIB_HAS_SEND_DMA)
911                         qib_teardown_sdma(ppd);
912 
913                 dd->f_sendctrl(ppd, QIB_SENDCTRL_AVAIL_DIS |
914                                     QIB_SENDCTRL_SEND_DIS);
915                 /*
916                  * Clear SerdesEnable.
917                  * We can't count on interrupts since we are stopping.
918                  */
919                 dd->f_quiet_serdes(ppd);
920 
921                 if (ppd->qib_wq) {
922                         destroy_workqueue(ppd->qib_wq);
923                         ppd->qib_wq = NULL;
924                 }
925                 qib_free_pportdata(ppd);
926         }
927 
928 }
929 
930 /**
931  * qib_free_ctxtdata - free a context's allocated data
932  * @dd: the qlogic_ib device
933  * @rcd: the ctxtdata structure
934  *
935  * free up any allocated data for a context
936  * This should not touch anything that would affect a simultaneous
937  * re-allocation of context data, because it is called after qib_mutex
938  * is released (and can be called from reinit as well).
939  * It should never change any chip state, or global driver state.
940  */
941 void qib_free_ctxtdata(struct qib_devdata *dd, struct qib_ctxtdata *rcd)
942 {
943         if (!rcd)
944                 return;
945 
946         if (rcd->rcvhdrq) {
947                 dma_free_coherent(&dd->pcidev->dev, rcd->rcvhdrq_size,
948                                   rcd->rcvhdrq, rcd->rcvhdrq_phys);
949                 rcd->rcvhdrq = NULL;
950                 if (rcd->rcvhdrtail_kvaddr) {
951                         dma_free_coherent(&dd->pcidev->dev, PAGE_SIZE,
952                                           rcd->rcvhdrtail_kvaddr,
953                                           rcd->rcvhdrqtailaddr_phys);
954                         rcd->rcvhdrtail_kvaddr = NULL;
955                 }
956         }
957         if (rcd->rcvegrbuf) {
958                 unsigned e;
959 
960                 for (e = 0; e < rcd->rcvegrbuf_chunks; e++) {
961                         void *base = rcd->rcvegrbuf[e];
962                         size_t size = rcd->rcvegrbuf_size;
963 
964                         dma_free_coherent(&dd->pcidev->dev, size,
965                                           base, rcd->rcvegrbuf_phys[e]);
966                 }
967                 kfree(rcd->rcvegrbuf);
968                 rcd->rcvegrbuf = NULL;
969                 kfree(rcd->rcvegrbuf_phys);
970                 rcd->rcvegrbuf_phys = NULL;
971                 rcd->rcvegrbuf_chunks = 0;
972         }
973 
974         kfree(rcd->tid_pg_list);
975         vfree(rcd->user_event_mask);
976         vfree(rcd->subctxt_uregbase);
977         vfree(rcd->subctxt_rcvegrbuf);
978         vfree(rcd->subctxt_rcvhdr_base);
979 #ifdef CONFIG_DEBUG_FS
980         kfree(rcd->opstats);
981         rcd->opstats = NULL;
982 #endif
983         kfree(rcd);
984 }
985 
986 /*
987  * Perform a PIO buffer bandwidth write test, to verify proper system
988  * configuration.  Even when all the setup calls work, occasionally
989  * BIOS or other issues can prevent write combining from working, or
990  * can cause other bandwidth problems to the chip.
991  *
992  * This test simply writes the same buffer over and over again, and
993  * measures close to the peak bandwidth to the chip (not testing
994  * data bandwidth to the wire).   On chips that use an address-based
995  * trigger to send packets to the wire, this is easy.  On chips that
996  * use a count to trigger, we want to make sure that the packet doesn't
997  * go out on the wire, or trigger flow control checks.
998  */
999 static void qib_verify_pioperf(struct qib_devdata *dd)
1000 {
1001         u32 pbnum, cnt, lcnt;
1002         u32 __iomem *piobuf;
1003         u32 *addr;
1004         u64 msecs, emsecs;
1005 
1006         piobuf = dd->f_getsendbuf(dd->pport, 0ULL, &pbnum);
1007         if (!piobuf) {
1008                 qib_devinfo(dd->pcidev,
1009                          "No PIObufs for checking perf, skipping\n");
1010                 return;
1011         }
1012 
1013         /*
1014          * Enough to give us a reasonable test, less than piobuf size, and
1015          * likely multiple of store buffer length.
1016          */
1017         cnt = 1024;
1018 
1019         addr = vmalloc(cnt);
1020         if (!addr) {
1021                 qib_devinfo(dd->pcidev,
1022                          "Couldn't get memory for checking PIO perf, skipping\n");
1023                 goto done;
1024         }
1025 
1026         preempt_disable();  /* we want reasonably accurate elapsed time */
1027         msecs = 1 + jiffies_to_msecs(jiffies);
1028         for (lcnt = 0; lcnt < 10000U; lcnt++) {
1029                 /* wait until we cross msec boundary */
1030                 if (jiffies_to_msecs(jiffies) >= msecs)
1031                         break;
1032                 udelay(1);
1033         }
1034 
1035         dd->f_set_armlaunch(dd, 0);
1036 
1037         /*
1038          * length 0, no dwords actually sent
1039          */
1040         writeq(0, piobuf);
1041         qib_flush_wc();
1042 
1043         /*
1044          * This is only roughly accurate, since even with preempt we
1045          * still take interrupts that could take a while.   Running for
1046          * >= 5 msec seems to get us "close enough" to accurate values.
1047          */
1048         msecs = jiffies_to_msecs(jiffies);
1049         for (emsecs = lcnt = 0; emsecs <= 5UL; lcnt++) {
1050                 qib_pio_copy(piobuf + 64, addr, cnt >> 2);
1051                 emsecs = jiffies_to_msecs(jiffies) - msecs;
1052         }
1053 
1054         /* 1 GiB/sec, slightly over IB SDR line rate */
1055         if (lcnt < (emsecs * 1024U))
1056                 qib_dev_err(dd,
1057                             "Performance problem: bandwidth to PIO buffers is only %u MiB/sec\n",
1058                             lcnt / (u32) emsecs);
1059 
1060         preempt_enable();
1061 
1062         vfree(addr);
1063 
1064 done:
1065         /* disarm piobuf, so it's available again */
1066         dd->f_sendctrl(dd->pport, QIB_SENDCTRL_DISARM_BUF(pbnum));
1067         qib_sendbuf_done(dd, pbnum);
1068         dd->f_set_armlaunch(dd, 1);
1069 }
1070 
1071 void qib_free_devdata(struct qib_devdata *dd)
1072 {
1073         unsigned long flags;
1074 
1075         spin_lock_irqsave(&qib_devs_lock, flags);
1076         idr_remove(&qib_unit_table, dd->unit);
1077         list_del(&dd->list);
1078         spin_unlock_irqrestore(&qib_devs_lock, flags);
1079 
1080 #ifdef CONFIG_DEBUG_FS
1081         qib_dbg_ibdev_exit(&dd->verbs_dev);
1082 #endif
1083         free_percpu(dd->int_counter);
1084         ib_dealloc_device(&dd->verbs_dev.ibdev);
1085 }
1086 
1087 u64 qib_int_counter(struct qib_devdata *dd)
1088 {
1089         int cpu;
1090         u64 int_counter = 0;
1091 
1092         for_each_possible_cpu(cpu)
1093                 int_counter += *per_cpu_ptr(dd->int_counter, cpu);
1094         return int_counter;
1095 }
1096 
1097 u64 qib_sps_ints(void)
1098 {
1099         unsigned long flags;
1100         struct qib_devdata *dd;
1101         u64 sps_ints = 0;
1102 
1103         spin_lock_irqsave(&qib_devs_lock, flags);
1104         list_for_each_entry(dd, &qib_dev_list, list) {
1105                 sps_ints += qib_int_counter(dd);
1106         }
1107         spin_unlock_irqrestore(&qib_devs_lock, flags);
1108         return sps_ints;
1109 }
1110 
1111 /*
1112  * Allocate our primary per-unit data structure.  Must be done via verbs
1113  * allocator, because the verbs cleanup process both does cleanup and
1114  * free of the data structure.
1115  * "extra" is for chip-specific data.
1116  *
1117  * Use the idr mechanism to get a unit number for this unit.
1118  */
1119 struct qib_devdata *qib_alloc_devdata(struct pci_dev *pdev, size_t extra)
1120 {
1121         unsigned long flags;
1122         struct qib_devdata *dd;
1123         int ret;
1124 
1125         dd = (struct qib_devdata *) ib_alloc_device(sizeof(*dd) + extra);
1126         if (!dd)
1127                 return ERR_PTR(-ENOMEM);
1128 
1129         INIT_LIST_HEAD(&dd->list);
1130 
1131         idr_preload(GFP_KERNEL);
1132         spin_lock_irqsave(&qib_devs_lock, flags);
1133 
1134         ret = idr_alloc(&qib_unit_table, dd, 0, 0, GFP_NOWAIT);
1135         if (ret >= 0) {
1136                 dd->unit = ret;
1137                 list_add(&dd->list, &qib_dev_list);
1138         }
1139 
1140         spin_unlock_irqrestore(&qib_devs_lock, flags);
1141         idr_preload_end();
1142 
1143         if (ret < 0) {
1144                 qib_early_err(&pdev->dev,
1145                               "Could not allocate unit ID: error %d\n", -ret);
1146                 goto bail;
1147         }
1148         dd->int_counter = alloc_percpu(u64);
1149         if (!dd->int_counter) {
1150                 ret = -ENOMEM;
1151                 qib_early_err(&pdev->dev,
1152                               "Could not allocate per-cpu int_counter\n");
1153                 goto bail;
1154         }
1155 
1156         if (!qib_cpulist_count) {
1157                 u32 count = num_online_cpus();
1158 
1159                 qib_cpulist = kzalloc(BITS_TO_LONGS(count) *
1160                                       sizeof(long), GFP_KERNEL);
1161                 if (qib_cpulist)
1162                         qib_cpulist_count = count;
1163                 else
1164                         qib_early_err(&pdev->dev,
1165                                 "Could not alloc cpulist info, cpu affinity might be wrong\n");
1166         }
1167 #ifdef CONFIG_DEBUG_FS
1168         qib_dbg_ibdev_init(&dd->verbs_dev);
1169 #endif
1170         return dd;
1171 bail:
1172         if (!list_empty(&dd->list))
1173                 list_del_init(&dd->list);
1174         ib_dealloc_device(&dd->verbs_dev.ibdev);
1175         return ERR_PTR(ret);
1176 }
1177 
1178 /*
1179  * Called from freeze mode handlers, and from PCI error
1180  * reporting code.  Should be paranoid about state of
1181  * system and data structures.
1182  */
1183 void qib_disable_after_error(struct qib_devdata *dd)
1184 {
1185         if (dd->flags & QIB_INITTED) {
1186                 u32 pidx;
1187 
1188                 dd->flags &= ~QIB_INITTED;
1189                 if (dd->pport)
1190                         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1191                                 struct qib_pportdata *ppd;
1192 
1193                                 ppd = dd->pport + pidx;
1194                                 if (dd->flags & QIB_PRESENT) {
1195                                         qib_set_linkstate(ppd,
1196                                                 QIB_IB_LINKDOWN_DISABLE);
1197                                         dd->f_setextled(ppd, 0);
1198                                 }
1199                                 *ppd->statusp &= ~QIB_STATUS_IB_READY;
1200                         }
1201         }
1202 
1203         /*
1204          * Mark as having had an error for driver, and also
1205          * for /sys and status word mapped to user programs.
1206          * This marks unit as not usable, until reset.
1207          */
1208         if (dd->devstatusp)
1209                 *dd->devstatusp |= QIB_STATUS_HWERROR;
1210 }
1211 
1212 static void qib_remove_one(struct pci_dev *);
1213 static int qib_init_one(struct pci_dev *, const struct pci_device_id *);
1214 
1215 #define DRIVER_LOAD_MSG "Intel " QIB_DRV_NAME " loaded: "
1216 #define PFX QIB_DRV_NAME ": "
1217 
1218 static const struct pci_device_id qib_pci_tbl[] = {
1219         { PCI_DEVICE(PCI_VENDOR_ID_PATHSCALE, PCI_DEVICE_ID_QLOGIC_IB_6120) },
1220         { PCI_DEVICE(PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_IB_7220) },
1221         { PCI_DEVICE(PCI_VENDOR_ID_QLOGIC, PCI_DEVICE_ID_QLOGIC_IB_7322) },
1222         { 0, }
1223 };
1224 
1225 MODULE_DEVICE_TABLE(pci, qib_pci_tbl);
1226 
1227 static struct pci_driver qib_driver = {
1228         .name = QIB_DRV_NAME,
1229         .probe = qib_init_one,
1230         .remove = qib_remove_one,
1231         .id_table = qib_pci_tbl,
1232         .err_handler = &qib_pci_err_handler,
1233 };
1234 
1235 #ifdef CONFIG_INFINIBAND_QIB_DCA
1236 
1237 static int qib_notify_dca(struct notifier_block *, unsigned long, void *);
1238 static struct notifier_block dca_notifier = {
1239         .notifier_call  = qib_notify_dca,
1240         .next           = NULL,
1241         .priority       = 0
1242 };
1243 
1244 static int qib_notify_dca_device(struct device *device, void *data)
1245 {
1246         struct qib_devdata *dd = dev_get_drvdata(device);
1247         unsigned long event = *(unsigned long *)data;
1248 
1249         return dd->f_notify_dca(dd, event);
1250 }
1251 
1252 static int qib_notify_dca(struct notifier_block *nb, unsigned long event,
1253                                           void *p)
1254 {
1255         int rval;
1256 
1257         rval = driver_for_each_device(&qib_driver.driver, NULL,
1258                                       &event, qib_notify_dca_device);
1259         return rval ? NOTIFY_BAD : NOTIFY_DONE;
1260 }
1261 
1262 #endif
1263 
1264 /*
1265  * Do all the generic driver unit- and chip-independent memory
1266  * allocation and initialization.
1267  */
1268 static int __init qib_ib_init(void)
1269 {
1270         int ret;
1271 
1272         ret = qib_dev_init();
1273         if (ret)
1274                 goto bail;
1275 
1276         /*
1277          * These must be called before the driver is registered with
1278          * the PCI subsystem.
1279          */
1280         idr_init(&qib_unit_table);
1281 
1282 #ifdef CONFIG_INFINIBAND_QIB_DCA
1283         dca_register_notify(&dca_notifier);
1284 #endif
1285 #ifdef CONFIG_DEBUG_FS
1286         qib_dbg_init();
1287 #endif
1288         ret = pci_register_driver(&qib_driver);
1289         if (ret < 0) {
1290                 pr_err("Unable to register driver: error %d\n", -ret);
1291                 goto bail_dev;
1292         }
1293 
1294         /* not fatal if it doesn't work */
1295         if (qib_init_qibfs())
1296                 pr_err("Unable to register ipathfs\n");
1297         goto bail; /* all OK */
1298 
1299 bail_dev:
1300 #ifdef CONFIG_INFINIBAND_QIB_DCA
1301         dca_unregister_notify(&dca_notifier);
1302 #endif
1303 #ifdef CONFIG_DEBUG_FS
1304         qib_dbg_exit();
1305 #endif
1306         idr_destroy(&qib_unit_table);
1307         qib_dev_cleanup();
1308 bail:
1309         return ret;
1310 }
1311 
1312 module_init(qib_ib_init);
1313 
1314 /*
1315  * Do the non-unit driver cleanup, memory free, etc. at unload.
1316  */
1317 static void __exit qib_ib_cleanup(void)
1318 {
1319         int ret;
1320 
1321         ret = qib_exit_qibfs();
1322         if (ret)
1323                 pr_err(
1324                         "Unable to cleanup counter filesystem: error %d\n",
1325                         -ret);
1326 
1327 #ifdef CONFIG_INFINIBAND_QIB_DCA
1328         dca_unregister_notify(&dca_notifier);
1329 #endif
1330         pci_unregister_driver(&qib_driver);
1331 #ifdef CONFIG_DEBUG_FS
1332         qib_dbg_exit();
1333 #endif
1334 
1335         qib_cpulist_count = 0;
1336         kfree(qib_cpulist);
1337 
1338         idr_destroy(&qib_unit_table);
1339         qib_dev_cleanup();
1340 }
1341 
1342 module_exit(qib_ib_cleanup);
1343 
1344 /* this can only be called after a successful initialization */
1345 static void cleanup_device_data(struct qib_devdata *dd)
1346 {
1347         int ctxt;
1348         int pidx;
1349         struct qib_ctxtdata **tmp;
1350         unsigned long flags;
1351 
1352         /* users can't do anything more with chip */
1353         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1354                 if (dd->pport[pidx].statusp)
1355                         *dd->pport[pidx].statusp &= ~QIB_STATUS_CHIP_PRESENT;
1356 
1357                 spin_lock(&dd->pport[pidx].cc_shadow_lock);
1358 
1359                 kfree(dd->pport[pidx].congestion_entries);
1360                 dd->pport[pidx].congestion_entries = NULL;
1361                 kfree(dd->pport[pidx].ccti_entries);
1362                 dd->pport[pidx].ccti_entries = NULL;
1363                 kfree(dd->pport[pidx].ccti_entries_shadow);
1364                 dd->pport[pidx].ccti_entries_shadow = NULL;
1365                 kfree(dd->pport[pidx].congestion_entries_shadow);
1366                 dd->pport[pidx].congestion_entries_shadow = NULL;
1367 
1368                 spin_unlock(&dd->pport[pidx].cc_shadow_lock);
1369         }
1370 
1371         qib_disable_wc(dd);
1372 
1373         if (dd->pioavailregs_dma) {
1374                 dma_free_coherent(&dd->pcidev->dev, PAGE_SIZE,
1375                                   (void *) dd->pioavailregs_dma,
1376                                   dd->pioavailregs_phys);
1377                 dd->pioavailregs_dma = NULL;
1378         }
1379 
1380         if (dd->pageshadow) {
1381                 struct page **tmpp = dd->pageshadow;
1382                 dma_addr_t *tmpd = dd->physshadow;
1383                 int i;
1384 
1385                 for (ctxt = 0; ctxt < dd->cfgctxts; ctxt++) {
1386                         int ctxt_tidbase = ctxt * dd->rcvtidcnt;
1387                         int maxtid = ctxt_tidbase + dd->rcvtidcnt;
1388 
1389                         for (i = ctxt_tidbase; i < maxtid; i++) {
1390                                 if (!tmpp[i])
1391                                         continue;
1392                                 pci_unmap_page(dd->pcidev, tmpd[i],
1393                                                PAGE_SIZE, PCI_DMA_FROMDEVICE);
1394                                 qib_release_user_pages(&tmpp[i], 1);
1395                                 tmpp[i] = NULL;
1396                         }
1397                 }
1398 
1399                 dd->pageshadow = NULL;
1400                 vfree(tmpp);
1401                 dd->physshadow = NULL;
1402                 vfree(tmpd);
1403         }
1404 
1405         /*
1406          * Free any resources still in use (usually just kernel contexts)
1407          * at unload; we do for ctxtcnt, because that's what we allocate.
1408          * We acquire lock to be really paranoid that rcd isn't being
1409          * accessed from some interrupt-related code (that should not happen,
1410          * but best to be sure).
1411          */
1412         spin_lock_irqsave(&dd->uctxt_lock, flags);
1413         tmp = dd->rcd;
1414         dd->rcd = NULL;
1415         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1416         for (ctxt = 0; tmp && ctxt < dd->ctxtcnt; ctxt++) {
1417                 struct qib_ctxtdata *rcd = tmp[ctxt];
1418 
1419                 tmp[ctxt] = NULL; /* debugging paranoia */
1420                 qib_free_ctxtdata(dd, rcd);
1421         }
1422         kfree(tmp);
1423         kfree(dd->boardname);
1424         qib_cq_exit(dd);
1425 }
1426 
1427 /*
1428  * Clean up on unit shutdown, or error during unit load after
1429  * successful initialization.
1430  */
1431 static void qib_postinit_cleanup(struct qib_devdata *dd)
1432 {
1433         /*
1434          * Clean up chip-specific stuff.
1435          * We check for NULL here, because it's outside
1436          * the kregbase check, and we need to call it
1437          * after the free_irq.  Thus it's possible that
1438          * the function pointers were never initialized.
1439          */
1440         if (dd->f_cleanup)
1441                 dd->f_cleanup(dd);
1442 
1443         qib_pcie_ddcleanup(dd);
1444 
1445         cleanup_device_data(dd);
1446 
1447         qib_free_devdata(dd);
1448 }
1449 
1450 static int qib_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
1451 {
1452         int ret, j, pidx, initfail;
1453         struct qib_devdata *dd = NULL;
1454 
1455         ret = qib_pcie_init(pdev, ent);
1456         if (ret)
1457                 goto bail;
1458 
1459         /*
1460          * Do device-specific initialiation, function table setup, dd
1461          * allocation, etc.
1462          */
1463         switch (ent->device) {
1464         case PCI_DEVICE_ID_QLOGIC_IB_6120:
1465 #ifdef CONFIG_PCI_MSI
1466                 dd = qib_init_iba6120_funcs(pdev, ent);
1467 #else
1468                 qib_early_err(&pdev->dev,
1469                         "Intel PCIE device 0x%x cannot work if CONFIG_PCI_MSI is not enabled\n",
1470                         ent->device);
1471                 dd = ERR_PTR(-ENODEV);
1472 #endif
1473                 break;
1474 
1475         case PCI_DEVICE_ID_QLOGIC_IB_7220:
1476                 dd = qib_init_iba7220_funcs(pdev, ent);
1477                 break;
1478 
1479         case PCI_DEVICE_ID_QLOGIC_IB_7322:
1480                 dd = qib_init_iba7322_funcs(pdev, ent);
1481                 break;
1482 
1483         default:
1484                 qib_early_err(&pdev->dev,
1485                         "Failing on unknown Intel deviceid 0x%x\n",
1486                         ent->device);
1487                 ret = -ENODEV;
1488         }
1489 
1490         if (IS_ERR(dd))
1491                 ret = PTR_ERR(dd);
1492         if (ret)
1493                 goto bail; /* error already printed */
1494 
1495         ret = qib_create_workqueues(dd);
1496         if (ret)
1497                 goto bail;
1498 
1499         /* do the generic initialization */
1500         initfail = qib_init(dd, 0);
1501 
1502         ret = qib_register_ib_device(dd);
1503 
1504         /*
1505          * Now ready for use.  this should be cleared whenever we
1506          * detect a reset, or initiate one.  If earlier failure,
1507          * we still create devices, so diags, etc. can be used
1508          * to determine cause of problem.
1509          */
1510         if (!qib_mini_init && !initfail && !ret)
1511                 dd->flags |= QIB_INITTED;
1512 
1513         j = qib_device_create(dd);
1514         if (j)
1515                 qib_dev_err(dd, "Failed to create /dev devices: %d\n", -j);
1516         j = qibfs_add(dd);
1517         if (j)
1518                 qib_dev_err(dd, "Failed filesystem setup for counters: %d\n",
1519                             -j);
1520 
1521         if (qib_mini_init || initfail || ret) {
1522                 qib_stop_timers(dd);
1523                 flush_workqueue(ib_wq);
1524                 for (pidx = 0; pidx < dd->num_pports; ++pidx)
1525                         dd->f_quiet_serdes(dd->pport + pidx);
1526                 if (qib_mini_init)
1527                         goto bail;
1528                 if (!j) {
1529                         (void) qibfs_remove(dd);
1530                         qib_device_remove(dd);
1531                 }
1532                 if (!ret)
1533                         qib_unregister_ib_device(dd);
1534                 qib_postinit_cleanup(dd);
1535                 if (initfail)
1536                         ret = initfail;
1537                 goto bail;
1538         }
1539 
1540         ret = qib_enable_wc(dd);
1541         if (ret) {
1542                 qib_dev_err(dd,
1543                         "Write combining not enabled (err %d): performance may be poor\n",
1544                         -ret);
1545                 ret = 0;
1546         }
1547 
1548         qib_verify_pioperf(dd);
1549 bail:
1550         return ret;
1551 }
1552 
1553 static void qib_remove_one(struct pci_dev *pdev)
1554 {
1555         struct qib_devdata *dd = pci_get_drvdata(pdev);
1556         int ret;
1557 
1558         /* unregister from IB core */
1559         qib_unregister_ib_device(dd);
1560 
1561         /*
1562          * Disable the IB link, disable interrupts on the device,
1563          * clear dma engines, etc.
1564          */
1565         if (!qib_mini_init)
1566                 qib_shutdown_device(dd);
1567 
1568         qib_stop_timers(dd);
1569 
1570         /* wait until all of our (qsfp) queue_work() calls complete */
1571         flush_workqueue(ib_wq);
1572 
1573         ret = qibfs_remove(dd);
1574         if (ret)
1575                 qib_dev_err(dd, "Failed counters filesystem cleanup: %d\n",
1576                             -ret);
1577 
1578         qib_device_remove(dd);
1579 
1580         qib_postinit_cleanup(dd);
1581 }
1582 
1583 /**
1584  * qib_create_rcvhdrq - create a receive header queue
1585  * @dd: the qlogic_ib device
1586  * @rcd: the context data
1587  *
1588  * This must be contiguous memory (from an i/o perspective), and must be
1589  * DMA'able (which means for some systems, it will go through an IOMMU,
1590  * or be forced into a low address range).
1591  */
1592 int qib_create_rcvhdrq(struct qib_devdata *dd, struct qib_ctxtdata *rcd)
1593 {
1594         unsigned amt;
1595         int old_node_id;
1596 
1597         if (!rcd->rcvhdrq) {
1598                 dma_addr_t phys_hdrqtail;
1599                 gfp_t gfp_flags;
1600 
1601                 amt = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize *
1602                             sizeof(u32), PAGE_SIZE);
1603                 gfp_flags = (rcd->ctxt >= dd->first_user_ctxt) ?
1604                         GFP_USER : GFP_KERNEL;
1605 
1606                 old_node_id = dev_to_node(&dd->pcidev->dev);
1607                 set_dev_node(&dd->pcidev->dev, rcd->node_id);
1608                 rcd->rcvhdrq = dma_alloc_coherent(
1609                         &dd->pcidev->dev, amt, &rcd->rcvhdrq_phys,
1610                         gfp_flags | __GFP_COMP);
1611                 set_dev_node(&dd->pcidev->dev, old_node_id);
1612 
1613                 if (!rcd->rcvhdrq) {
1614                         qib_dev_err(dd,
1615                                 "attempt to allocate %d bytes for ctxt %u rcvhdrq failed\n",
1616                                 amt, rcd->ctxt);
1617                         goto bail;
1618                 }
1619 
1620                 if (rcd->ctxt >= dd->first_user_ctxt) {
1621                         rcd->user_event_mask = vmalloc_user(PAGE_SIZE);
1622                         if (!rcd->user_event_mask)
1623                                 goto bail_free_hdrq;
1624                 }
1625 
1626                 if (!(dd->flags & QIB_NODMA_RTAIL)) {
1627                         set_dev_node(&dd->pcidev->dev, rcd->node_id);
1628                         rcd->rcvhdrtail_kvaddr = dma_alloc_coherent(
1629                                 &dd->pcidev->dev, PAGE_SIZE, &phys_hdrqtail,
1630                                 gfp_flags);
1631                         set_dev_node(&dd->pcidev->dev, old_node_id);
1632                         if (!rcd->rcvhdrtail_kvaddr)
1633                                 goto bail_free;
1634                         rcd->rcvhdrqtailaddr_phys = phys_hdrqtail;
1635                 }
1636 
1637                 rcd->rcvhdrq_size = amt;
1638         }
1639 
1640         /* clear for security and sanity on each use */
1641         memset(rcd->rcvhdrq, 0, rcd->rcvhdrq_size);
1642         if (rcd->rcvhdrtail_kvaddr)
1643                 memset(rcd->rcvhdrtail_kvaddr, 0, PAGE_SIZE);
1644         return 0;
1645 
1646 bail_free:
1647         qib_dev_err(dd,
1648                 "attempt to allocate 1 page for ctxt %u rcvhdrqtailaddr failed\n",
1649                 rcd->ctxt);
1650         vfree(rcd->user_event_mask);
1651         rcd->user_event_mask = NULL;
1652 bail_free_hdrq:
1653         dma_free_coherent(&dd->pcidev->dev, amt, rcd->rcvhdrq,
1654                           rcd->rcvhdrq_phys);
1655         rcd->rcvhdrq = NULL;
1656 bail:
1657         return -ENOMEM;
1658 }
1659 
1660 /**
1661  * allocate eager buffers, both kernel and user contexts.
1662  * @rcd: the context we are setting up.
1663  *
1664  * Allocate the eager TID buffers and program them into hip.
1665  * They are no longer completely contiguous, we do multiple allocation
1666  * calls.  Otherwise we get the OOM code involved, by asking for too
1667  * much per call, with disastrous results on some kernels.
1668  */
1669 int qib_setup_eagerbufs(struct qib_ctxtdata *rcd)
1670 {
1671         struct qib_devdata *dd = rcd->dd;
1672         unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff;
1673         size_t size;
1674         gfp_t gfp_flags;
1675         int old_node_id;
1676 
1677         /*
1678          * GFP_USER, but without GFP_FS, so buffer cache can be
1679          * coalesced (we hope); otherwise, even at order 4,
1680          * heavy filesystem activity makes these fail, and we can
1681          * use compound pages.
1682          */
1683         gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP;
1684 
1685         egrcnt = rcd->rcvegrcnt;
1686         egroff = rcd->rcvegr_tid_base;
1687         egrsize = dd->rcvegrbufsize;
1688 
1689         chunk = rcd->rcvegrbuf_chunks;
1690         egrperchunk = rcd->rcvegrbufs_perchunk;
1691         size = rcd->rcvegrbuf_size;
1692         if (!rcd->rcvegrbuf) {
1693                 rcd->rcvegrbuf =
1694                         kzalloc_node(chunk * sizeof(rcd->rcvegrbuf[0]),
1695                                 GFP_KERNEL, rcd->node_id);
1696                 if (!rcd->rcvegrbuf)
1697                         goto bail;
1698         }
1699         if (!rcd->rcvegrbuf_phys) {
1700                 rcd->rcvegrbuf_phys =
1701                         kmalloc_node(chunk * sizeof(rcd->rcvegrbuf_phys[0]),
1702                                 GFP_KERNEL, rcd->node_id);
1703                 if (!rcd->rcvegrbuf_phys)
1704                         goto bail_rcvegrbuf;
1705         }
1706         for (e = 0; e < rcd->rcvegrbuf_chunks; e++) {
1707                 if (rcd->rcvegrbuf[e])
1708                         continue;
1709 
1710                 old_node_id = dev_to_node(&dd->pcidev->dev);
1711                 set_dev_node(&dd->pcidev->dev, rcd->node_id);
1712                 rcd->rcvegrbuf[e] =
1713                         dma_alloc_coherent(&dd->pcidev->dev, size,
1714                                            &rcd->rcvegrbuf_phys[e],
1715                                            gfp_flags);
1716                 set_dev_node(&dd->pcidev->dev, old_node_id);
1717                 if (!rcd->rcvegrbuf[e])
1718                         goto bail_rcvegrbuf_phys;
1719         }
1720 
1721         rcd->rcvegr_phys = rcd->rcvegrbuf_phys[0];
1722 
1723         for (e = chunk = 0; chunk < rcd->rcvegrbuf_chunks; chunk++) {
1724                 dma_addr_t pa = rcd->rcvegrbuf_phys[chunk];
1725                 unsigned i;
1726 
1727                 /* clear for security and sanity on each use */
1728                 memset(rcd->rcvegrbuf[chunk], 0, size);
1729 
1730                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
1731                         dd->f_put_tid(dd, e + egroff +
1732                                           (u64 __iomem *)
1733                                           ((char __iomem *)
1734                                            dd->kregbase +
1735                                            dd->rcvegrbase),
1736                                           RCVHQ_RCV_TYPE_EAGER, pa);
1737                         pa += egrsize;
1738                 }
1739                 cond_resched(); /* don't hog the cpu */
1740         }
1741 
1742         return 0;
1743 
1744 bail_rcvegrbuf_phys:
1745         for (e = 0; e < rcd->rcvegrbuf_chunks && rcd->rcvegrbuf[e]; e++)
1746                 dma_free_coherent(&dd->pcidev->dev, size,
1747                                   rcd->rcvegrbuf[e], rcd->rcvegrbuf_phys[e]);
1748         kfree(rcd->rcvegrbuf_phys);
1749         rcd->rcvegrbuf_phys = NULL;
1750 bail_rcvegrbuf:
1751         kfree(rcd->rcvegrbuf);
1752         rcd->rcvegrbuf = NULL;
1753 bail:
1754         return -ENOMEM;
1755 }
1756 
1757 /*
1758  * Note: Changes to this routine should be mirrored
1759  * for the diagnostics routine qib_remap_ioaddr32().
1760  * There is also related code for VL15 buffers in qib_init_7322_variables().
1761  * The teardown code that unmaps is in qib_pcie_ddcleanup()
1762  */
1763 int init_chip_wc_pat(struct qib_devdata *dd, u32 vl15buflen)
1764 {
1765         u64 __iomem *qib_kregbase = NULL;
1766         void __iomem *qib_piobase = NULL;
1767         u64 __iomem *qib_userbase = NULL;
1768         u64 qib_kreglen;
1769         u64 qib_pio2koffset = dd->piobufbase & 0xffffffff;
1770         u64 qib_pio4koffset = dd->piobufbase >> 32;
1771         u64 qib_pio2klen = dd->piobcnt2k * dd->palign;
1772         u64 qib_pio4klen = dd->piobcnt4k * dd->align4k;
1773         u64 qib_physaddr = dd->physaddr;
1774         u64 qib_piolen;
1775         u64 qib_userlen = 0;
1776 
1777         /*
1778          * Free the old mapping because the kernel will try to reuse the
1779          * old mapping and not create a new mapping with the
1780          * write combining attribute.
1781          */
1782         iounmap(dd->kregbase);
1783         dd->kregbase = NULL;
1784 
1785         /*
1786          * Assumes chip address space looks like:
1787          *      - kregs + sregs + cregs + uregs (in any order)
1788          *      - piobufs (2K and 4K bufs in either order)
1789          * or:
1790          *      - kregs + sregs + cregs (in any order)
1791          *      - piobufs (2K and 4K bufs in either order)
1792          *      - uregs
1793          */
1794         if (dd->piobcnt4k == 0) {
1795                 qib_kreglen = qib_pio2koffset;
1796                 qib_piolen = qib_pio2klen;
1797         } else if (qib_pio2koffset < qib_pio4koffset) {
1798                 qib_kreglen = qib_pio2koffset;
1799                 qib_piolen = qib_pio4koffset + qib_pio4klen - qib_kreglen;
1800         } else {
1801                 qib_kreglen = qib_pio4koffset;
1802                 qib_piolen = qib_pio2koffset + qib_pio2klen - qib_kreglen;
1803         }
1804         qib_piolen += vl15buflen;
1805         /* Map just the configured ports (not all hw ports) */
1806         if (dd->uregbase > qib_kreglen)
1807                 qib_userlen = dd->ureg_align * dd->cfgctxts;
1808 
1809         /* Sanity checks passed, now create the new mappings */
1810         qib_kregbase = ioremap_nocache(qib_physaddr, qib_kreglen);
1811         if (!qib_kregbase)
1812                 goto bail;
1813 
1814         qib_piobase = ioremap_wc(qib_physaddr + qib_kreglen, qib_piolen);
1815         if (!qib_piobase)
1816                 goto bail_kregbase;
1817 
1818         if (qib_userlen) {
1819                 qib_userbase = ioremap_nocache(qib_physaddr + dd->uregbase,
1820                                                qib_userlen);
1821                 if (!qib_userbase)
1822                         goto bail_piobase;
1823         }
1824 
1825         dd->kregbase = qib_kregbase;
1826         dd->kregend = (u64 __iomem *)
1827                 ((char __iomem *) qib_kregbase + qib_kreglen);
1828         dd->piobase = qib_piobase;
1829         dd->pio2kbase = (void __iomem *)
1830                 (((char __iomem *) dd->piobase) +
1831                  qib_pio2koffset - qib_kreglen);
1832         if (dd->piobcnt4k)
1833                 dd->pio4kbase = (void __iomem *)
1834                         (((char __iomem *) dd->piobase) +
1835                          qib_pio4koffset - qib_kreglen);
1836         if (qib_userlen)
1837                 /* ureg will now be accessed relative to dd->userbase */
1838                 dd->userbase = qib_userbase;
1839         return 0;
1840 
1841 bail_piobase:
1842         iounmap(qib_piobase);
1843 bail_kregbase:
1844         iounmap(qib_kregbase);
1845 bail:
1846         return -ENOMEM;
1847 }
1848 

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