drivers/scsi/lpfc/lpfc_mem.c

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Fibre Channel Host Bus Adapters.                                *
   4  * Copyright (C) 2004-2014 Emulex.  All rights reserved.           *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
   8  *                                                                 *
   9  * This program is free software; you can redistribute it and/or   *
  10  * modify it under the terms of version 2 of the GNU General       *
  11  * Public License as published by the Free Software Foundation.    *
  12  * This program is distributed in the hope that it will be useful. *
  13  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  14  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  15  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  16  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  17  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  18  * more details, a copy of which can be found in the file COPYING  *
  19  * included with this package.                                     *
  20  *******************************************************************/
  21
  22 #include <linux/mempool.h>
  23 #include <linux/slab.h>
  24 #include <linux/pci.h>
  25 #include <linux/interrupt.h>
  26
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/scsi_transport_fc.h>
  29
  30 #include <scsi/scsi.h>
  31
  32 #include "lpfc_hw4.h"
  33 #include "lpfc_hw.h"
  34 #include "lpfc_sli.h"
  35 #include "lpfc_sli4.h"
  36 #include "lpfc_nl.h"
  37 #include "lpfc_disc.h"
  38 #include "lpfc_scsi.h"
  39 #include "lpfc.h"
  40 #include "lpfc_crtn.h"
  41 #include "lpfc_logmsg.h"
  42
  43 #define LPFC_MBUF_POOL_SIZE     64      /* max elements in MBUF safety pool */
  44 #define LPFC_MEM_POOL_SIZE      64      /* max elem in non-DMA safety pool */
  45 #define LPFC_DEVICE_DATA_POOL_SIZE 64   /* max elements in device data pool */
  46
  47 int
  48 lpfc_mem_alloc_active_rrq_pool_s4(struct lpfc_hba *phba) {
  49         size_t bytes;
  50         int max_xri = phba->sli4_hba.max_cfg_param.max_xri;
  51
  52         if (max_xri <= 0)
  53                 return -ENOMEM;
  54         bytes = ((BITS_PER_LONG - 1 + max_xri) / BITS_PER_LONG) *
  55                   sizeof(unsigned long);
  56         phba->cfg_rrq_xri_bitmap_sz = bytes;
  57         phba->active_rrq_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
  58                                                             bytes);
  59         if (!phba->active_rrq_pool)
  60                 return -ENOMEM;
  61         else
  62                 return 0;
  63 }
  64
  65 /**
  66  * lpfc_mem_alloc - create and allocate all PCI and memory pools
  67  * @phba: HBA to allocate pools for
  68  *
  69  * Description: Creates and allocates PCI pools lpfc_scsi_dma_buf_pool,
  70  * lpfc_mbuf_pool, lpfc_hrb_pool.  Creates and allocates kmalloc-backed mempools
  71  * for LPFC_MBOXQ_t and lpfc_nodelist.  Also allocates the VPI bitmask.
  72  *
  73  * Notes: Not interrupt-safe.  Must be called with no locks held.  If any
  74  * allocation fails, frees all successfully allocated memory before returning.
  75  *
  76  * Returns:
  77  *   0 on success
  78  *   -ENOMEM on failure (if any memory allocations fail)
  79  **/
  80 int
  81 lpfc_mem_alloc(struct lpfc_hba *phba, int align)
  82 {
  83         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
  84         int i;
  85
  86         if (phba->sli_rev == LPFC_SLI_REV4) {
  87                 /* Calculate alignment */
  88                 if (phba->cfg_sg_dma_buf_size < SLI4_PAGE_SIZE)
  89                         i = phba->cfg_sg_dma_buf_size;
  90                 else
  91                         i = SLI4_PAGE_SIZE;
  92
  93                 phba->lpfc_scsi_dma_buf_pool =
  94                         pci_pool_create("lpfc_scsi_dma_buf_pool",
  95                                 phba->pcidev,
  96                                 phba->cfg_sg_dma_buf_size,
  97                                 i,
  98                                 0);
  99         } else {
 100                 phba->lpfc_scsi_dma_buf_pool =
 101                         pci_pool_create("lpfc_scsi_dma_buf_pool",
 102                                 phba->pcidev, phba->cfg_sg_dma_buf_size,
 103                                 align, 0);
 104         }
 105
 106         if (!phba->lpfc_scsi_dma_buf_pool)
 107                 goto fail;
 108
 109         phba->lpfc_mbuf_pool = pci_pool_create("lpfc_mbuf_pool", phba->pcidev,
 110                                                         LPFC_BPL_SIZE,
 111                                                         align, 0);
 112         if (!phba->lpfc_mbuf_pool)
 113                 goto fail_free_dma_buf_pool;
 114
 115         pool->elements = kmalloc(sizeof(struct lpfc_dmabuf) *
 116                                          LPFC_MBUF_POOL_SIZE, GFP_KERNEL);
 117         if (!pool->elements)
 118                 goto fail_free_lpfc_mbuf_pool;
 119
 120         pool->max_count = 0;
 121         pool->current_count = 0;
 122         for ( i = 0; i < LPFC_MBUF_POOL_SIZE; i++) {
 123                 pool->elements[i].virt = pci_pool_alloc(phba->lpfc_mbuf_pool,
 124                                        GFP_KERNEL, &pool->elements[i].phys);
 125                 if (!pool->elements[i].virt)
 126                         goto fail_free_mbuf_pool;
 127                 pool->max_count++;
 128                 pool->current_count++;
 129         }
 130
 131         phba->mbox_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
 132                                                          sizeof(LPFC_MBOXQ_t));
 133         if (!phba->mbox_mem_pool)
 134                 goto fail_free_mbuf_pool;
 135
 136         phba->nlp_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
 137                                                 sizeof(struct lpfc_nodelist));
 138         if (!phba->nlp_mem_pool)
 139                 goto fail_free_mbox_pool;
 140
 141         if (phba->sli_rev == LPFC_SLI_REV4) {
 142                 phba->rrq_pool =
 143                         mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
 144                                                 sizeof(struct lpfc_node_rrq));
 145                 if (!phba->rrq_pool)
 146                         goto fail_free_nlp_mem_pool;
 147                 phba->lpfc_hrb_pool = pci_pool_create("lpfc_hrb_pool",
 148                                               phba->pcidev,
 149                                               LPFC_HDR_BUF_SIZE, align, 0);
 150                 if (!phba->lpfc_hrb_pool)
 151                         goto fail_free_rrq_mem_pool;
 152
 153                 phba->lpfc_drb_pool = pci_pool_create("lpfc_drb_pool",
 154                                               phba->pcidev,
 155                                               LPFC_DATA_BUF_SIZE, align, 0);
 156                 if (!phba->lpfc_drb_pool)
 157                         goto fail_free_hrb_pool;
 158                 phba->lpfc_hbq_pool = NULL;
 159         } else {
 160                 phba->lpfc_hbq_pool = pci_pool_create("lpfc_hbq_pool",
 161                         phba->pcidev, LPFC_BPL_SIZE, align, 0);
 162                 if (!phba->lpfc_hbq_pool)
 163                         goto fail_free_nlp_mem_pool;
 164                 phba->lpfc_hrb_pool = NULL;
 165                 phba->lpfc_drb_pool = NULL;
 166         }
 167
 168         if (phba->cfg_EnableXLane) {
 169                 phba->device_data_mem_pool = mempool_create_kmalloc_pool(
 170                                         LPFC_DEVICE_DATA_POOL_SIZE,
 171                                         sizeof(struct lpfc_device_data));
 172                 if (!phba->device_data_mem_pool)
 173                         goto fail_free_hrb_pool;
 174         } else {
 175                 phba->device_data_mem_pool = NULL;
 176         }
 177
 178         return 0;
 179  fail_free_hrb_pool:
 180         pci_pool_destroy(phba->lpfc_hrb_pool);
 181         phba->lpfc_hrb_pool = NULL;
 182  fail_free_rrq_mem_pool:
 183         mempool_destroy(phba->rrq_pool);
 184         phba->rrq_pool = NULL;
 185  fail_free_nlp_mem_pool:
 186         mempool_destroy(phba->nlp_mem_pool);
 187         phba->nlp_mem_pool = NULL;
 188  fail_free_mbox_pool:
 189         mempool_destroy(phba->mbox_mem_pool);
 190         phba->mbox_mem_pool = NULL;
 191  fail_free_mbuf_pool:
 192         while (i--)
 193                 pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
 194                                                  pool->elements[i].phys);
 195         kfree(pool->elements);
 196  fail_free_lpfc_mbuf_pool:
 197         pci_pool_destroy(phba->lpfc_mbuf_pool);
 198         phba->lpfc_mbuf_pool = NULL;
 199  fail_free_dma_buf_pool:
 200         pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
 201         phba->lpfc_scsi_dma_buf_pool = NULL;
 202  fail:
 203         return -ENOMEM;
 204 }
 205
 206 /**
 207  * lpfc_mem_free - Frees memory allocated by lpfc_mem_alloc
 208  * @phba: HBA to free memory for
 209  *
 210  * Description: Free the memory allocated by lpfc_mem_alloc routine. This
 211  * routine is a the counterpart of lpfc_mem_alloc.
 212  *
 213  * Returns: None
 214  **/
 215 void
 216 lpfc_mem_free(struct lpfc_hba *phba)
 217 {
 218         int i;
 219         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
 220         struct lpfc_device_data *device_data;
 221
 222         /* Free HBQ pools */
 223         lpfc_sli_hbqbuf_free_all(phba);
 224         if (phba->lpfc_drb_pool)
 225                 pci_pool_destroy(phba->lpfc_drb_pool);
 226         phba->lpfc_drb_pool = NULL;
 227         if (phba->lpfc_hrb_pool)
 228                 pci_pool_destroy(phba->lpfc_hrb_pool);
 229         phba->lpfc_hrb_pool = NULL;
 230
 231         if (phba->lpfc_hbq_pool)
 232                 pci_pool_destroy(phba->lpfc_hbq_pool);
 233         phba->lpfc_hbq_pool = NULL;
 234         mempool_destroy(phba->rrq_pool);
 235         phba->rrq_pool = NULL;
 236
 237         /* Free NLP memory pool */
 238         mempool_destroy(phba->nlp_mem_pool);
 239         phba->nlp_mem_pool = NULL;
 240         if (phba->sli_rev == LPFC_SLI_REV4) {
 241                 mempool_destroy(phba->active_rrq_pool);
 242                 phba->active_rrq_pool = NULL;
 243         }
 244
 245         /* Free mbox memory pool */
 246         mempool_destroy(phba->mbox_mem_pool);
 247         phba->mbox_mem_pool = NULL;
 248
 249         /* Free MBUF memory pool */
 250         for (i = 0; i < pool->current_count; i++)
 251                 pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
 252                               pool->elements[i].phys);
 253         kfree(pool->elements);
 254
 255         pci_pool_destroy(phba->lpfc_mbuf_pool);
 256         phba->lpfc_mbuf_pool = NULL;
 257
 258         /* Free DMA buffer memory pool */
 259         pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
 260         phba->lpfc_scsi_dma_buf_pool = NULL;
 261
 262         /* Free Device Data memory pool */
 263         if (phba->device_data_mem_pool) {
 264                 /* Ensure all objects have been returned to the pool */
 265                 while (!list_empty(&phba->luns)) {
 266                         device_data = list_first_entry(&phba->luns,
 267                                                        struct lpfc_device_data,
 268                                                        listentry);
 269                         list_del(&device_data->listentry);
 270                         mempool_free(device_data, phba->device_data_mem_pool);
 271                 }
 272                 mempool_destroy(phba->device_data_mem_pool);
 273         }
 274         phba->device_data_mem_pool = NULL;
 275         return;
 276 }
 277
 278 /**
 279  * lpfc_mem_free_all - Frees all PCI and driver memory
 280  * @phba: HBA to free memory for
 281  *
 282  * Description: Free memory from PCI and driver memory pools and also those
 283  * used : lpfc_scsi_dma_buf_pool, lpfc_mbuf_pool, lpfc_hrb_pool. Frees
 284  * kmalloc-backed mempools for LPFC_MBOXQ_t and lpfc_nodelist. Also frees
 285  * the VPI bitmask.
 286  *
 287  * Returns: None
 288  **/
 289 void
 290 lpfc_mem_free_all(struct lpfc_hba *phba)
 291 {
 292         struct lpfc_sli *psli = &phba->sli;
 293         LPFC_MBOXQ_t *mbox, *next_mbox;
 294         struct lpfc_dmabuf   *mp;
 295
 296         /* Free memory used in mailbox queue back to mailbox memory pool */
 297         list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq, list) {
 298                 mp = (struct lpfc_dmabuf *) (mbox->context1);
 299                 if (mp) {
 300                         lpfc_mbuf_free(phba, mp->virt, mp->phys);
 301                         kfree(mp);
 302                 }
 303                 list_del(&mbox->list);
 304                 mempool_free(mbox, phba->mbox_mem_pool);
 305         }
 306         /* Free memory used in mailbox cmpl list back to mailbox memory pool */
 307         list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq_cmpl, list) {
 308                 mp = (struct lpfc_dmabuf *) (mbox->context1);
 309                 if (mp) {
 310                         lpfc_mbuf_free(phba, mp->virt, mp->phys);
 311                         kfree(mp);
 312                 }
 313                 list_del(&mbox->list);
 314                 mempool_free(mbox, phba->mbox_mem_pool);
 315         }
 316         /* Free the active mailbox command back to the mailbox memory pool */
 317         spin_lock_irq(&phba->hbalock);
 318         psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
 319         spin_unlock_irq(&phba->hbalock);
 320         if (psli->mbox_active) {
 321                 mbox = psli->mbox_active;
 322                 mp = (struct lpfc_dmabuf *) (mbox->context1);
 323                 if (mp) {
 324                         lpfc_mbuf_free(phba, mp->virt, mp->phys);
 325                         kfree(mp);
 326                 }
 327                 mempool_free(mbox, phba->mbox_mem_pool);
 328                 psli->mbox_active = NULL;
 329         }
 330
 331         /* Free and destroy all the allocated memory pools */
 332         lpfc_mem_free(phba);
 333
 334         /* Free the iocb lookup array */
 335         kfree(psli->iocbq_lookup);
 336         psli->iocbq_lookup = NULL;
 337
 338         return;
 339 }
 340
 341 /**
 342  * lpfc_mbuf_alloc - Allocate an mbuf from the lpfc_mbuf_pool PCI pool
 343  * @phba: HBA which owns the pool to allocate from
 344  * @mem_flags: indicates if this is a priority (MEM_PRI) allocation
 345  * @handle: used to return the DMA-mapped address of the mbuf
 346  *
 347  * Description: Allocates a DMA-mapped buffer from the lpfc_mbuf_pool PCI pool.
 348  * Allocates from generic pci_pool_alloc function first and if that fails and
 349  * mem_flags has MEM_PRI set (the only defined flag), returns an mbuf from the
 350  * HBA's pool.
 351  *
 352  * Notes: Not interrupt-safe.  Must be called with no locks held.  Takes
 353  * phba->hbalock.
 354  *
 355  * Returns:
 356  *   pointer to the allocated mbuf on success
 357  *   NULL on failure
 358  **/
 359 void *
 360 lpfc_mbuf_alloc(struct lpfc_hba *phba, int mem_flags, dma_addr_t *handle)
 361 {
 362         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
 363         unsigned long iflags;
 364         void *ret;
 365
 366         ret = pci_pool_alloc(phba->lpfc_mbuf_pool, GFP_KERNEL, handle);
 367
 368         spin_lock_irqsave(&phba->hbalock, iflags);
 369         if (!ret && (mem_flags & MEM_PRI) && pool->current_count) {
 370                 pool->current_count--;
 371                 ret = pool->elements[pool->current_count].virt;
 372                 *handle = pool->elements[pool->current_count].phys;
 373         }
 374         spin_unlock_irqrestore(&phba->hbalock, iflags);
 375         return ret;
 376 }
 377
 378 /**
 379  * __lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (locked)
 380  * @phba: HBA which owns the pool to return to
 381  * @virt: mbuf to free
 382  * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
 383  *
 384  * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
 385  * it is below its max_count, frees the mbuf otherwise.
 386  *
 387  * Notes: Must be called with phba->hbalock held to synchronize access to
 388  * lpfc_mbuf_safety_pool.
 389  *
 390  * Returns: None
 391  **/
 392 void
 393 __lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
 394 {
 395         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
 396
 397         if (pool->current_count < pool->max_count) {
 398                 pool->elements[pool->current_count].virt = virt;
 399                 pool->elements[pool->current_count].phys = dma;
 400                 pool->current_count++;
 401         } else {
 402                 pci_pool_free(phba->lpfc_mbuf_pool, virt, dma);
 403         }
 404         return;
 405 }
 406
 407 /**
 408  * lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (unlocked)
 409  * @phba: HBA which owns the pool to return to
 410  * @virt: mbuf to free
 411  * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
 412  *
 413  * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
 414  * it is below its max_count, frees the mbuf otherwise.
 415  *
 416  * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
 417  *
 418  * Returns: None
 419  **/
 420 void
 421 lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
 422 {
 423         unsigned long iflags;
 424
 425         spin_lock_irqsave(&phba->hbalock, iflags);
 426         __lpfc_mbuf_free(phba, virt, dma);
 427         spin_unlock_irqrestore(&phba->hbalock, iflags);
 428         return;
 429 }
 430
 431 /**
 432  * lpfc_els_hbq_alloc - Allocate an HBQ buffer
 433  * @phba: HBA to allocate HBQ buffer for
 434  *
 435  * Description: Allocates a DMA-mapped HBQ buffer from the lpfc_hrb_pool PCI
 436  * pool along a non-DMA-mapped container for it.
 437  *
 438  * Notes: Not interrupt-safe.  Must be called with no locks held.
 439  *
 440  * Returns:
 441  *   pointer to HBQ on success
 442  *   NULL on failure
 443  **/
 444 struct hbq_dmabuf *
 445 lpfc_els_hbq_alloc(struct lpfc_hba *phba)
 446 {
 447         struct hbq_dmabuf *hbqbp;
 448
 449         hbqbp = kzalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
 450         if (!hbqbp)
 451                 return NULL;
 452
 453         hbqbp->dbuf.virt = pci_pool_alloc(phba->lpfc_hbq_pool, GFP_KERNEL,
 454                                           &hbqbp->dbuf.phys);
 455         if (!hbqbp->dbuf.virt) {
 456                 kfree(hbqbp);
 457                 return NULL;
 458         }
 459         hbqbp->size = LPFC_BPL_SIZE;
 460         return hbqbp;
 461 }
 462
 463 /**
 464  * lpfc_els_hbq_free - Frees an HBQ buffer allocated with lpfc_els_hbq_alloc
 465  * @phba: HBA buffer was allocated for
 466  * @hbqbp: HBQ container returned by lpfc_els_hbq_alloc
 467  *
 468  * Description: Frees both the container and the DMA-mapped buffer returned by
 469  * lpfc_els_hbq_alloc.
 470  *
 471  * Notes: Can be called with or without locks held.
 472  *
 473  * Returns: None
 474  **/
 475 void
 476 lpfc_els_hbq_free(struct lpfc_hba *phba, struct hbq_dmabuf *hbqbp)
 477 {
 478         pci_pool_free(phba->lpfc_hbq_pool, hbqbp->dbuf.virt, hbqbp->dbuf.phys);
 479         kfree(hbqbp);
 480         return;
 481 }
 482
 483 /**
 484  * lpfc_sli4_rb_alloc - Allocate an SLI4 Receive buffer
 485  * @phba: HBA to allocate a receive buffer for
 486  *
 487  * Description: Allocates a DMA-mapped receive buffer from the lpfc_hrb_pool PCI
 488  * pool along a non-DMA-mapped container for it.
 489  *
 490  * Notes: Not interrupt-safe.  Must be called with no locks held.
 491  *
 492  * Returns:
 493  *   pointer to HBQ on success
 494  *   NULL on failure
 495  **/
 496 struct hbq_dmabuf *
 497 lpfc_sli4_rb_alloc(struct lpfc_hba *phba)
 498 {
 499         struct hbq_dmabuf *dma_buf;
 500
 501         dma_buf = kzalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
 502         if (!dma_buf)
 503                 return NULL;
 504
 505         dma_buf->hbuf.virt = pci_pool_alloc(phba->lpfc_hrb_pool, GFP_KERNEL,
 506                                             &dma_buf->hbuf.phys);
 507         if (!dma_buf->hbuf.virt) {
 508                 kfree(dma_buf);
 509                 return NULL;
 510         }
 511         dma_buf->dbuf.virt = pci_pool_alloc(phba->lpfc_drb_pool, GFP_KERNEL,
 512                                             &dma_buf->dbuf.phys);
 513         if (!dma_buf->dbuf.virt) {
 514                 pci_pool_free(phba->lpfc_hrb_pool, dma_buf->hbuf.virt,
 515                               dma_buf->hbuf.phys);
 516                 kfree(dma_buf);
 517                 return NULL;
 518         }
 519         dma_buf->size = LPFC_BPL_SIZE;
 520         return dma_buf;
 521 }
 522
 523 /**
 524  * lpfc_sli4_rb_free - Frees a receive buffer
 525  * @phba: HBA buffer was allocated for
 526  * @dmab: DMA Buffer container returned by lpfc_sli4_hbq_alloc
 527  *
 528  * Description: Frees both the container and the DMA-mapped buffers returned by
 529  * lpfc_sli4_rb_alloc.
 530  *
 531  * Notes: Can be called with or without locks held.
 532  *
 533  * Returns: None
 534  **/
 535 void
 536 lpfc_sli4_rb_free(struct lpfc_hba *phba, struct hbq_dmabuf *dmab)
 537 {
 538         pci_pool_free(phba->lpfc_hrb_pool, dmab->hbuf.virt, dmab->hbuf.phys);
 539         pci_pool_free(phba->lpfc_drb_pool, dmab->dbuf.virt, dmab->dbuf.phys);
 540         kfree(dmab);
 541         return;
 542 }
 543
 544 /**
 545  * lpfc_in_buf_free - Free a DMA buffer
 546  * @phba: HBA buffer is associated with
 547  * @mp: Buffer to free
 548  *
 549  * Description: Frees the given DMA buffer in the appropriate way given if the
 550  * HBA is running in SLI3 mode with HBQs enabled.
 551  *
 552  * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
 553  *
 554  * Returns: None
 555  **/
 556 void
 557 lpfc_in_buf_free(struct lpfc_hba *phba, struct lpfc_dmabuf *mp)
 558 {
 559         struct hbq_dmabuf *hbq_entry;
 560         unsigned long flags;
 561
 562         if (!mp)
 563                 return;
 564
 565         if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
 566                 /* Check whether HBQ is still in use */
 567                 spin_lock_irqsave(&phba->hbalock, flags);
 568                 if (!phba->hbq_in_use) {
 569                         spin_unlock_irqrestore(&phba->hbalock, flags);
 570                         return;
 571                 }
 572                 hbq_entry = container_of(mp, struct hbq_dmabuf, dbuf);
 573                 list_del(&hbq_entry->dbuf.list);
 574                 if (hbq_entry->tag == -1) {
 575                         (phba->hbqs[LPFC_ELS_HBQ].hbq_free_buffer)
 576                                 (phba, hbq_entry);
 577                 } else {
 578                         lpfc_sli_free_hbq(phba, hbq_entry);
 579                 }
 580                 spin_unlock_irqrestore(&phba->hbalock, flags);
 581         } else {
 582                 lpfc_mbuf_free(phba, mp->virt, mp->phys);
 583                 kfree(mp);
 584         }
 585         return;
 586 }