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) 2004-2009 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/pci.h>
  24 #include <linux/interrupt.h>
  25
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_transport_fc.h>
  28
  29 #include <scsi/scsi.h>
  30
  31 #include "lpfc_hw4.h"
  32 #include "lpfc_hw.h"
  33 #include "lpfc_sli.h"
  34 #include "lpfc_sli4.h"
  35 #include "lpfc_nl.h"
  36 #include "lpfc_disc.h"
  37 #include "lpfc_scsi.h"
  38 #include "lpfc.h"
  39 #include "lpfc_crtn.h"
  40
  41 #define LPFC_MBUF_POOL_SIZE     64      /* max elements in MBUF safety pool */
  42 #define LPFC_MEM_POOL_SIZE      64      /* max elem in non-DMA safety pool */
  43
  44
  45 /**
  46  * lpfc_mem_alloc - create and allocate all PCI and memory pools
  47  * @phba: HBA to allocate pools for
  48  *
  49  * Description: Creates and allocates PCI pools lpfc_scsi_dma_buf_pool,
  50  * lpfc_mbuf_pool, lpfc_hrb_pool.  Creates and allocates kmalloc-backed mempools
  51  * for LPFC_MBOXQ_t and lpfc_nodelist.  Also allocates the VPI bitmask.
  52  *
  53  * Notes: Not interrupt-safe.  Must be called with no locks held.  If any
  54  * allocation fails, frees all successfully allocated memory before returning.
  55  *
  56  * Returns:
  57  *   0 on success
  58  *   -ENOMEM on failure (if any memory allocations fail)
  59  **/
  60 int
  61 lpfc_mem_alloc(struct lpfc_hba *phba, int align)
  62 {
  63         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
  64         int longs;
  65         int i;
  66
  67         if (phba->sli_rev == LPFC_SLI_REV4)
  68                 phba->lpfc_scsi_dma_buf_pool =
  69                         pci_pool_create("lpfc_scsi_dma_buf_pool",
  70                                 phba->pcidev,
  71                                 phba->cfg_sg_dma_buf_size,
  72                                 phba->cfg_sg_dma_buf_size,
  73                                 0);
  74         else
  75                 phba->lpfc_scsi_dma_buf_pool =
  76                         pci_pool_create("lpfc_scsi_dma_buf_pool",
  77                                 phba->pcidev, phba->cfg_sg_dma_buf_size,
  78                                 align, 0);
  79         if (!phba->lpfc_scsi_dma_buf_pool)
  80                 goto fail;
  81
  82         phba->lpfc_mbuf_pool = pci_pool_create("lpfc_mbuf_pool", phba->pcidev,
  83                                                         LPFC_BPL_SIZE,
  84                                                         align, 0);
  85         if (!phba->lpfc_mbuf_pool)
  86                 goto fail_free_dma_buf_pool;
  87
  88         pool->elements = kmalloc(sizeof(struct lpfc_dmabuf) *
  89                                          LPFC_MBUF_POOL_SIZE, GFP_KERNEL);
  90         if (!pool->elements)
  91                 goto fail_free_lpfc_mbuf_pool;
  92
  93         pool->max_count = 0;
  94         pool->current_count = 0;
  95         for ( i = 0; i < LPFC_MBUF_POOL_SIZE; i++) {
  96                 pool->elements[i].virt = pci_pool_alloc(phba->lpfc_mbuf_pool,
  97                                        GFP_KERNEL, &pool->elements[i].phys);
  98                 if (!pool->elements[i].virt)
  99                         goto fail_free_mbuf_pool;
 100                 pool->max_count++;
 101                 pool->current_count++;
 102         }
 103
 104         phba->mbox_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
 105                                                          sizeof(LPFC_MBOXQ_t));
 106         if (!phba->mbox_mem_pool)
 107                 goto fail_free_mbuf_pool;
 108
 109         phba->nlp_mem_pool = mempool_create_kmalloc_pool(LPFC_MEM_POOL_SIZE,
 110                                                 sizeof(struct lpfc_nodelist));
 111         if (!phba->nlp_mem_pool)
 112                 goto fail_free_mbox_pool;
 113
 114         if (phba->sli_rev == LPFC_SLI_REV4) {
 115                 phba->lpfc_hrb_pool = pci_pool_create("lpfc_hrb_pool",
 116                                               phba->pcidev,
 117                                               LPFC_HDR_BUF_SIZE, align, 0);
 118                 if (!phba->lpfc_hrb_pool)
 119                         goto fail_free_nlp_mem_pool;
 120
 121                 phba->lpfc_drb_pool = pci_pool_create("lpfc_drb_pool",
 122                                               phba->pcidev,
 123                                               LPFC_DATA_BUF_SIZE, align, 0);
 124                 if (!phba->lpfc_drb_pool)
 125                         goto fail_free_hrb_pool;
 126                 phba->lpfc_hbq_pool = NULL;
 127         } else {
 128                 phba->lpfc_hbq_pool = pci_pool_create("lpfc_hbq_pool",
 129                         phba->pcidev, LPFC_BPL_SIZE, align, 0);
 130                 if (!phba->lpfc_hbq_pool)
 131                         goto fail_free_nlp_mem_pool;
 132                 phba->lpfc_hrb_pool = NULL;
 133                 phba->lpfc_drb_pool = NULL;
 134         }
 135         /* vpi zero is reserved for the physical port so add 1 to max */
 136         longs = ((phba->max_vpi + 1) + BITS_PER_LONG - 1) / BITS_PER_LONG;
 137         phba->vpi_bmask = kzalloc(longs * sizeof(unsigned long), GFP_KERNEL);
 138         if (!phba->vpi_bmask)
 139                 goto fail_free_dbq_pool;
 140
 141         return 0;
 142
 143  fail_free_dbq_pool:
 144         pci_pool_destroy(phba->lpfc_drb_pool);
 145         phba->lpfc_drb_pool = NULL;
 146  fail_free_hrb_pool:
 147         pci_pool_destroy(phba->lpfc_hrb_pool);
 148         phba->lpfc_hrb_pool = NULL;
 149  fail_free_nlp_mem_pool:
 150         mempool_destroy(phba->nlp_mem_pool);
 151         phba->nlp_mem_pool = NULL;
 152  fail_free_mbox_pool:
 153         mempool_destroy(phba->mbox_mem_pool);
 154         phba->mbox_mem_pool = NULL;
 155  fail_free_mbuf_pool:
 156         while (i--)
 157                 pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
 158                                                  pool->elements[i].phys);
 159         kfree(pool->elements);
 160  fail_free_lpfc_mbuf_pool:
 161         pci_pool_destroy(phba->lpfc_mbuf_pool);
 162         phba->lpfc_mbuf_pool = NULL;
 163  fail_free_dma_buf_pool:
 164         pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
 165         phba->lpfc_scsi_dma_buf_pool = NULL;
 166  fail:
 167         return -ENOMEM;
 168 }
 169
 170 /**
 171  * lpfc_mem_free - Frees memory allocated by lpfc_mem_alloc
 172  * @phba: HBA to free memory for
 173  *
 174  * Description: Free the memory allocated by lpfc_mem_alloc routine. This
 175  * routine is a the counterpart of lpfc_mem_alloc.
 176  *
 177  * Returns: None
 178  **/
 179 void
 180 lpfc_mem_free(struct lpfc_hba *phba)
 181 {
 182         int i;
 183         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
 184
 185         /* Free VPI bitmask memory */
 186         kfree(phba->vpi_bmask);
 187
 188         /* Free HBQ pools */
 189         lpfc_sli_hbqbuf_free_all(phba);
 190         if (phba->lpfc_drb_pool)
 191                 pci_pool_destroy(phba->lpfc_drb_pool);
 192         phba->lpfc_drb_pool = NULL;
 193         if (phba->lpfc_hrb_pool)
 194                 pci_pool_destroy(phba->lpfc_hrb_pool);
 195         phba->lpfc_hrb_pool = NULL;
 196
 197         if (phba->lpfc_hbq_pool)
 198                 pci_pool_destroy(phba->lpfc_hbq_pool);
 199         phba->lpfc_hbq_pool = NULL;
 200
 201         /* Free NLP memory pool */
 202         mempool_destroy(phba->nlp_mem_pool);
 203         phba->nlp_mem_pool = NULL;
 204
 205         /* Free mbox memory pool */
 206         mempool_destroy(phba->mbox_mem_pool);
 207         phba->mbox_mem_pool = NULL;
 208
 209         /* Free MBUF memory pool */
 210         for (i = 0; i < pool->current_count; i++)
 211                 pci_pool_free(phba->lpfc_mbuf_pool, pool->elements[i].virt,
 212                               pool->elements[i].phys);
 213         kfree(pool->elements);
 214
 215         pci_pool_destroy(phba->lpfc_mbuf_pool);
 216         phba->lpfc_mbuf_pool = NULL;
 217
 218         /* Free DMA buffer memory pool */
 219         pci_pool_destroy(phba->lpfc_scsi_dma_buf_pool);
 220         phba->lpfc_scsi_dma_buf_pool = NULL;
 221
 222         return;
 223 }
 224
 225 /**
 226  * lpfc_mem_free_all - Frees all PCI and driver memory
 227  * @phba: HBA to free memory for
 228  *
 229  * Description: Free memory from PCI and driver memory pools and also those
 230  * used : lpfc_scsi_dma_buf_pool, lpfc_mbuf_pool, lpfc_hrb_pool. Frees
 231  * kmalloc-backed mempools for LPFC_MBOXQ_t and lpfc_nodelist. Also frees
 232  * the VPI bitmask.
 233  *
 234  * Returns: None
 235  **/
 236 void
 237 lpfc_mem_free_all(struct lpfc_hba *phba)
 238 {
 239         struct lpfc_sli *psli = &phba->sli;
 240         LPFC_MBOXQ_t *mbox, *next_mbox;
 241         struct lpfc_dmabuf   *mp;
 242
 243         /* Free memory used in mailbox queue back to mailbox memory pool */
 244         list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq, list) {
 245                 mp = (struct lpfc_dmabuf *) (mbox->context1);
 246                 if (mp) {
 247                         lpfc_mbuf_free(phba, mp->virt, mp->phys);
 248                         kfree(mp);
 249                 }
 250                 list_del(&mbox->list);
 251                 mempool_free(mbox, phba->mbox_mem_pool);
 252         }
 253         /* Free memory used in mailbox cmpl list back to mailbox memory pool */
 254         list_for_each_entry_safe(mbox, next_mbox, &psli->mboxq_cmpl, list) {
 255                 mp = (struct lpfc_dmabuf *) (mbox->context1);
 256                 if (mp) {
 257                         lpfc_mbuf_free(phba, mp->virt, mp->phys);
 258                         kfree(mp);
 259                 }
 260                 list_del(&mbox->list);
 261                 mempool_free(mbox, phba->mbox_mem_pool);
 262         }
 263         /* Free the active mailbox command back to the mailbox memory pool */
 264         spin_lock_irq(&phba->hbalock);
 265         psli->sli_flag &= ~LPFC_SLI_MBOX_ACTIVE;
 266         spin_unlock_irq(&phba->hbalock);
 267         if (psli->mbox_active) {
 268                 mbox = psli->mbox_active;
 269                 mp = (struct lpfc_dmabuf *) (mbox->context1);
 270                 if (mp) {
 271                         lpfc_mbuf_free(phba, mp->virt, mp->phys);
 272                         kfree(mp);
 273                 }
 274                 mempool_free(mbox, phba->mbox_mem_pool);
 275                 psli->mbox_active = NULL;
 276         }
 277
 278         /* Free and destroy all the allocated memory pools */
 279         lpfc_mem_free(phba);
 280
 281         /* Free the iocb lookup array */
 282         kfree(psli->iocbq_lookup);
 283         psli->iocbq_lookup = NULL;
 284
 285         return;
 286 }
 287
 288 /**
 289  * lpfc_mbuf_alloc - Allocate an mbuf from the lpfc_mbuf_pool PCI pool
 290  * @phba: HBA which owns the pool to allocate from
 291  * @mem_flags: indicates if this is a priority (MEM_PRI) allocation
 292  * @handle: used to return the DMA-mapped address of the mbuf
 293  *
 294  * Description: Allocates a DMA-mapped buffer from the lpfc_mbuf_pool PCI pool.
 295  * Allocates from generic pci_pool_alloc function first and if that fails and
 296  * mem_flags has MEM_PRI set (the only defined flag), returns an mbuf from the
 297  * HBA's pool.
 298  *
 299  * Notes: Not interrupt-safe.  Must be called with no locks held.  Takes
 300  * phba->hbalock.
 301  *
 302  * Returns:
 303  *   pointer to the allocated mbuf on success
 304  *   NULL on failure
 305  **/
 306 void *
 307 lpfc_mbuf_alloc(struct lpfc_hba *phba, int mem_flags, dma_addr_t *handle)
 308 {
 309         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
 310         unsigned long iflags;
 311         void *ret;
 312
 313         ret = pci_pool_alloc(phba->lpfc_mbuf_pool, GFP_KERNEL, handle);
 314
 315         spin_lock_irqsave(&phba->hbalock, iflags);
 316         if (!ret && (mem_flags & MEM_PRI) && pool->current_count) {
 317                 pool->current_count--;
 318                 ret = pool->elements[pool->current_count].virt;
 319                 *handle = pool->elements[pool->current_count].phys;
 320         }
 321         spin_unlock_irqrestore(&phba->hbalock, iflags);
 322         return ret;
 323 }
 324
 325 /**
 326  * __lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (locked)
 327  * @phba: HBA which owns the pool to return to
 328  * @virt: mbuf to free
 329  * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
 330  *
 331  * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
 332  * it is below its max_count, frees the mbuf otherwise.
 333  *
 334  * Notes: Must be called with phba->hbalock held to synchronize access to
 335  * lpfc_mbuf_safety_pool.
 336  *
 337  * Returns: None
 338  **/
 339 void
 340 __lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
 341 {
 342         struct lpfc_dma_pool *pool = &phba->lpfc_mbuf_safety_pool;
 343
 344         if (pool->current_count < pool->max_count) {
 345                 pool->elements[pool->current_count].virt = virt;
 346                 pool->elements[pool->current_count].phys = dma;
 347                 pool->current_count++;
 348         } else {
 349                 pci_pool_free(phba->lpfc_mbuf_pool, virt, dma);
 350         }
 351         return;
 352 }
 353
 354 /**
 355  * lpfc_mbuf_free - Free an mbuf from the lpfc_mbuf_pool PCI pool (unlocked)
 356  * @phba: HBA which owns the pool to return to
 357  * @virt: mbuf to free
 358  * @dma: the DMA-mapped address of the lpfc_mbuf_pool to be freed
 359  *
 360  * Description: Returns an mbuf lpfc_mbuf_pool to the lpfc_mbuf_safety_pool if
 361  * it is below its max_count, frees the mbuf otherwise.
 362  *
 363  * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
 364  *
 365  * Returns: None
 366  **/
 367 void
 368 lpfc_mbuf_free(struct lpfc_hba * phba, void *virt, dma_addr_t dma)
 369 {
 370         unsigned long iflags;
 371
 372         spin_lock_irqsave(&phba->hbalock, iflags);
 373         __lpfc_mbuf_free(phba, virt, dma);
 374         spin_unlock_irqrestore(&phba->hbalock, iflags);
 375         return;
 376 }
 377
 378 /**
 379  * lpfc_els_hbq_alloc - Allocate an HBQ buffer
 380  * @phba: HBA to allocate HBQ buffer for
 381  *
 382  * Description: Allocates a DMA-mapped HBQ buffer from the lpfc_hrb_pool PCI
 383  * pool along a non-DMA-mapped container for it.
 384  *
 385  * Notes: Not interrupt-safe.  Must be called with no locks held.
 386  *
 387  * Returns:
 388  *   pointer to HBQ on success
 389  *   NULL on failure
 390  **/
 391 struct hbq_dmabuf *
 392 lpfc_els_hbq_alloc(struct lpfc_hba *phba)
 393 {
 394         struct hbq_dmabuf *hbqbp;
 395
 396         hbqbp = kmalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
 397         if (!hbqbp)
 398                 return NULL;
 399
 400         hbqbp->dbuf.virt = pci_pool_alloc(phba->lpfc_hbq_pool, GFP_KERNEL,
 401                                           &hbqbp->dbuf.phys);
 402         if (!hbqbp->dbuf.virt) {
 403                 kfree(hbqbp);
 404                 return NULL;
 405         }
 406         hbqbp->size = LPFC_BPL_SIZE;
 407         return hbqbp;
 408 }
 409
 410 /**
 411  * lpfc_els_hbq_free - Frees an HBQ buffer allocated with lpfc_els_hbq_alloc
 412  * @phba: HBA buffer was allocated for
 413  * @hbqbp: HBQ container returned by lpfc_els_hbq_alloc
 414  *
 415  * Description: Frees both the container and the DMA-mapped buffer returned by
 416  * lpfc_els_hbq_alloc.
 417  *
 418  * Notes: Can be called with or without locks held.
 419  *
 420  * Returns: None
 421  **/
 422 void
 423 lpfc_els_hbq_free(struct lpfc_hba *phba, struct hbq_dmabuf *hbqbp)
 424 {
 425         pci_pool_free(phba->lpfc_hbq_pool, hbqbp->dbuf.virt, hbqbp->dbuf.phys);
 426         kfree(hbqbp);
 427         return;
 428 }
 429
 430 /**
 431  * lpfc_sli4_rb_alloc - Allocate an SLI4 Receive buffer
 432  * @phba: HBA to allocate a receive buffer for
 433  *
 434  * Description: Allocates a DMA-mapped receive buffer from the lpfc_hrb_pool PCI
 435  * pool along a non-DMA-mapped container for it.
 436  *
 437  * Notes: Not interrupt-safe.  Must be called with no locks held.
 438  *
 439  * Returns:
 440  *   pointer to HBQ on success
 441  *   NULL on failure
 442  **/
 443 struct hbq_dmabuf *
 444 lpfc_sli4_rb_alloc(struct lpfc_hba *phba)
 445 {
 446         struct hbq_dmabuf *dma_buf;
 447
 448         dma_buf = kmalloc(sizeof(struct hbq_dmabuf), GFP_KERNEL);
 449         if (!dma_buf)
 450                 return NULL;
 451
 452         dma_buf->hbuf.virt = pci_pool_alloc(phba->lpfc_hrb_pool, GFP_KERNEL,
 453                                             &dma_buf->hbuf.phys);
 454         if (!dma_buf->hbuf.virt) {
 455                 kfree(dma_buf);
 456                 return NULL;
 457         }
 458         dma_buf->dbuf.virt = pci_pool_alloc(phba->lpfc_drb_pool, GFP_KERNEL,
 459                                             &dma_buf->dbuf.phys);
 460         if (!dma_buf->dbuf.virt) {
 461                 pci_pool_free(phba->lpfc_hrb_pool, dma_buf->hbuf.virt,
 462                               dma_buf->hbuf.phys);
 463                 kfree(dma_buf);
 464                 return NULL;
 465         }
 466         dma_buf->size = LPFC_BPL_SIZE;
 467         return dma_buf;
 468 }
 469
 470 /**
 471  * lpfc_sli4_rb_free - Frees a receive buffer
 472  * @phba: HBA buffer was allocated for
 473  * @dmab: DMA Buffer container returned by lpfc_sli4_hbq_alloc
 474  *
 475  * Description: Frees both the container and the DMA-mapped buffers returned by
 476  * lpfc_sli4_rb_alloc.
 477  *
 478  * Notes: Can be called with or without locks held.
 479  *
 480  * Returns: None
 481  **/
 482 void
 483 lpfc_sli4_rb_free(struct lpfc_hba *phba, struct hbq_dmabuf *dmab)
 484 {
 485         pci_pool_free(phba->lpfc_hrb_pool, dmab->hbuf.virt, dmab->hbuf.phys);
 486         pci_pool_free(phba->lpfc_drb_pool, dmab->dbuf.virt, dmab->dbuf.phys);
 487         kfree(dmab);
 488         return;
 489 }
 490
 491 /**
 492  * lpfc_in_buf_free - Free a DMA buffer
 493  * @phba: HBA buffer is associated with
 494  * @mp: Buffer to free
 495  *
 496  * Description: Frees the given DMA buffer in the appropriate way given if the
 497  * HBA is running in SLI3 mode with HBQs enabled.
 498  *
 499  * Notes: Takes phba->hbalock.  Can be called with or without other locks held.
 500  *
 501  * Returns: None
 502  **/
 503 void
 504 lpfc_in_buf_free(struct lpfc_hba *phba, struct lpfc_dmabuf *mp)
 505 {
 506         struct hbq_dmabuf *hbq_entry;
 507         unsigned long flags;
 508
 509         if (!mp)
 510                 return;
 511
 512         if (phba->sli3_options & LPFC_SLI3_HBQ_ENABLED) {
 513                 /* Check whether HBQ is still in use */
 514                 spin_lock_irqsave(&phba->hbalock, flags);
 515                 if (!phba->hbq_in_use) {
 516                         spin_unlock_irqrestore(&phba->hbalock, flags);
 517                         return;
 518                 }
 519                 hbq_entry = container_of(mp, struct hbq_dmabuf, dbuf);
 520                 list_del(&hbq_entry->dbuf.list);
 521                 if (hbq_entry->tag == -1) {
 522                         (phba->hbqs[LPFC_ELS_HBQ].hbq_free_buffer)
 523                                 (phba, hbq_entry);
 524                 } else {
 525                         lpfc_sli_free_hbq(phba, hbq_entry);
 526                 }
 527                 spin_unlock_irqrestore(&phba->hbalock, flags);
 528         } else {
 529                 lpfc_mbuf_free(phba, mp->virt, mp->phys);
 530                 kfree(mp);
 531         }
 532         return;
 533 }