drivers/crypto/ccp/ccp-dmaengine.c

   1 /*
   2  * AMD Cryptographic Coprocessor (CCP) driver
   3  *
   4  * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
   5  *
   6  * Author: Gary R Hook <gary.hook@amd.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/dmaengine.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/mutex.h>
  18 #include <linux/ccp.h>
  19
  20 #include "ccp-dev.h"
  21 #include "../../dma/dmaengine.h"
  22
  23 #define CCP_DMA_WIDTH(_mask)            \
  24 ({                                      \
  25         u64 mask = _mask + 1;           \
  26         (mask == 0) ? 64 : fls64(mask); \
  27 })
  28
  29 /* The CCP as a DMA provider can be configured for public or private
  30  * channels. Default is specified in the vdata for the device (PCI ID).
  31  * This module parameter will override for all channels on all devices:
  32  *   dma_chan_attr = 0x2 to force all channels public
  33  *                 = 0x1 to force all channels private
  34  *                 = 0x0 to defer to the vdata setting
  35  *                 = any other value: warning, revert to 0x0
  36  */
  37 static unsigned int dma_chan_attr = CCP_DMA_DFLT;
  38 module_param(dma_chan_attr, uint, 0444);
  39 MODULE_PARM_DESC(dma_chan_attr, "Set DMA channel visibility: 0 (default) = device defaults, 1 = make private, 2 = make public");
  40
  41 unsigned int ccp_get_dma_chan_attr(struct ccp_device *ccp)
  42 {
  43         switch (dma_chan_attr) {
  44         case CCP_DMA_DFLT:
  45                 return ccp->vdata->dma_chan_attr;
  46
  47         case CCP_DMA_PRIV:
  48                 return DMA_PRIVATE;
  49
  50         case CCP_DMA_PUB:
  51                 return 0;
  52
  53         default:
  54                 dev_info_once(ccp->dev, "Invalid value for dma_chan_attr: %d\n",
  55                               dma_chan_attr);
  56                 return ccp->vdata->dma_chan_attr;
  57         }
  58 }
  59
  60 static void ccp_free_cmd_resources(struct ccp_device *ccp,
  61                                    struct list_head *list)
  62 {
  63         struct ccp_dma_cmd *cmd, *ctmp;
  64
  65         list_for_each_entry_safe(cmd, ctmp, list, entry) {
  66                 list_del(&cmd->entry);
  67                 kmem_cache_free(ccp->dma_cmd_cache, cmd);
  68         }
  69 }
  70
  71 static void ccp_free_desc_resources(struct ccp_device *ccp,
  72                                     struct list_head *list)
  73 {
  74         struct ccp_dma_desc *desc, *dtmp;
  75
  76         list_for_each_entry_safe(desc, dtmp, list, entry) {
  77                 ccp_free_cmd_resources(ccp, &desc->active);
  78                 ccp_free_cmd_resources(ccp, &desc->pending);
  79
  80                 list_del(&desc->entry);
  81                 kmem_cache_free(ccp->dma_desc_cache, desc);
  82         }
  83 }
  84
  85 static void ccp_free_chan_resources(struct dma_chan *dma_chan)
  86 {
  87         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
  88                                                  dma_chan);
  89         unsigned long flags;
  90
  91         dev_dbg(chan->ccp->dev, "%s - chan=%p\n", __func__, chan);
  92
  93         spin_lock_irqsave(&chan->lock, flags);
  94
  95         ccp_free_desc_resources(chan->ccp, &chan->complete);
  96         ccp_free_desc_resources(chan->ccp, &chan->active);
  97         ccp_free_desc_resources(chan->ccp, &chan->pending);
  98         ccp_free_desc_resources(chan->ccp, &chan->created);
  99
 100         spin_unlock_irqrestore(&chan->lock, flags);
 101 }
 102
 103 static void ccp_cleanup_desc_resources(struct ccp_device *ccp,
 104                                        struct list_head *list)
 105 {
 106         struct ccp_dma_desc *desc, *dtmp;
 107
 108         list_for_each_entry_safe_reverse(desc, dtmp, list, entry) {
 109                 if (!async_tx_test_ack(&desc->tx_desc))
 110                         continue;
 111
 112                 dev_dbg(ccp->dev, "%s - desc=%p\n", __func__, desc);
 113
 114                 ccp_free_cmd_resources(ccp, &desc->active);
 115                 ccp_free_cmd_resources(ccp, &desc->pending);
 116
 117                 list_del(&desc->entry);
 118                 kmem_cache_free(ccp->dma_desc_cache, desc);
 119         }
 120 }
 121
 122 static void ccp_do_cleanup(unsigned long data)
 123 {
 124         struct ccp_dma_chan *chan = (struct ccp_dma_chan *)data;
 125         unsigned long flags;
 126
 127         dev_dbg(chan->ccp->dev, "%s - chan=%s\n", __func__,
 128                 dma_chan_name(&chan->dma_chan));
 129
 130         spin_lock_irqsave(&chan->lock, flags);
 131
 132         ccp_cleanup_desc_resources(chan->ccp, &chan->complete);
 133
 134         spin_unlock_irqrestore(&chan->lock, flags);
 135 }
 136
 137 static int ccp_issue_next_cmd(struct ccp_dma_desc *desc)
 138 {
 139         struct ccp_dma_cmd *cmd;
 140         int ret;
 141
 142         cmd = list_first_entry(&desc->pending, struct ccp_dma_cmd, entry);
 143         list_move(&cmd->entry, &desc->active);
 144
 145         dev_dbg(desc->ccp->dev, "%s - tx %d, cmd=%p\n", __func__,
 146                 desc->tx_desc.cookie, cmd);
 147
 148         ret = ccp_enqueue_cmd(&cmd->ccp_cmd);
 149         if (!ret || (ret == -EINPROGRESS) || (ret == -EBUSY))
 150                 return 0;
 151
 152         dev_dbg(desc->ccp->dev, "%s - error: ret=%d, tx %d, cmd=%p\n", __func__,
 153                 ret, desc->tx_desc.cookie, cmd);
 154
 155         return ret;
 156 }
 157
 158 static void ccp_free_active_cmd(struct ccp_dma_desc *desc)
 159 {
 160         struct ccp_dma_cmd *cmd;
 161
 162         cmd = list_first_entry_or_null(&desc->active, struct ccp_dma_cmd,
 163                                        entry);
 164         if (!cmd)
 165                 return;
 166
 167         dev_dbg(desc->ccp->dev, "%s - freeing tx %d cmd=%p\n",
 168                 __func__, desc->tx_desc.cookie, cmd);
 169
 170         list_del(&cmd->entry);
 171         kmem_cache_free(desc->ccp->dma_cmd_cache, cmd);
 172 }
 173
 174 static struct ccp_dma_desc *__ccp_next_dma_desc(struct ccp_dma_chan *chan,
 175                                                 struct ccp_dma_desc *desc)
 176 {
 177         /* Move current DMA descriptor to the complete list */
 178         if (desc)
 179                 list_move(&desc->entry, &chan->complete);
 180
 181         /* Get the next DMA descriptor on the active list */
 182         desc = list_first_entry_or_null(&chan->active, struct ccp_dma_desc,
 183                                         entry);
 184
 185         return desc;
 186 }
 187
 188 static struct ccp_dma_desc *ccp_handle_active_desc(struct ccp_dma_chan *chan,
 189                                                    struct ccp_dma_desc *desc)
 190 {
 191         struct dma_async_tx_descriptor *tx_desc;
 192         unsigned long flags;
 193
 194         /* Loop over descriptors until one is found with commands */
 195         do {
 196                 if (desc) {
 197                         /* Remove the DMA command from the list and free it */
 198                         ccp_free_active_cmd(desc);
 199
 200                         if (!list_empty(&desc->pending)) {
 201                                 /* No errors, keep going */
 202                                 if (desc->status != DMA_ERROR)
 203                                         return desc;
 204
 205                                 /* Error, free remaining commands and move on */
 206                                 ccp_free_cmd_resources(desc->ccp,
 207                                                        &desc->pending);
 208                         }
 209
 210                         tx_desc = &desc->tx_desc;
 211                 } else {
 212                         tx_desc = NULL;
 213                 }
 214
 215                 spin_lock_irqsave(&chan->lock, flags);
 216
 217                 if (desc) {
 218                         if (desc->status != DMA_ERROR)
 219                                 desc->status = DMA_COMPLETE;
 220
 221                         dev_dbg(desc->ccp->dev,
 222                                 "%s - tx %d complete, status=%u\n", __func__,
 223                                 desc->tx_desc.cookie, desc->status);
 224
 225                         dma_cookie_complete(tx_desc);
 226                         dma_descriptor_unmap(tx_desc);
 227                 }
 228
 229                 desc = __ccp_next_dma_desc(chan, desc);
 230
 231                 spin_unlock_irqrestore(&chan->lock, flags);
 232
 233                 if (tx_desc) {
 234                         dmaengine_desc_get_callback_invoke(tx_desc, NULL);
 235
 236                         dma_run_dependencies(tx_desc);
 237                 }
 238         } while (desc);
 239
 240         return NULL;
 241 }
 242
 243 static struct ccp_dma_desc *__ccp_pending_to_active(struct ccp_dma_chan *chan)
 244 {
 245         struct ccp_dma_desc *desc;
 246
 247         if (list_empty(&chan->pending))
 248                 return NULL;
 249
 250         desc = list_empty(&chan->active)
 251                 ? list_first_entry(&chan->pending, struct ccp_dma_desc, entry)
 252                 : NULL;
 253
 254         list_splice_tail_init(&chan->pending, &chan->active);
 255
 256         return desc;
 257 }
 258
 259 static void ccp_cmd_callback(void *data, int err)
 260 {
 261         struct ccp_dma_desc *desc = data;
 262         struct ccp_dma_chan *chan;
 263         int ret;
 264
 265         if (err == -EINPROGRESS)
 266                 return;
 267
 268         chan = container_of(desc->tx_desc.chan, struct ccp_dma_chan,
 269                             dma_chan);
 270
 271         dev_dbg(chan->ccp->dev, "%s - tx %d callback, err=%d\n",
 272                 __func__, desc->tx_desc.cookie, err);
 273
 274         if (err)
 275                 desc->status = DMA_ERROR;
 276
 277         while (true) {
 278                 /* Check for DMA descriptor completion */
 279                 desc = ccp_handle_active_desc(chan, desc);
 280
 281                 /* Don't submit cmd if no descriptor or DMA is paused */
 282                 if (!desc || (chan->status == DMA_PAUSED))
 283                         break;
 284
 285                 ret = ccp_issue_next_cmd(desc);
 286                 if (!ret)
 287                         break;
 288
 289                 desc->status = DMA_ERROR;
 290         }
 291
 292         tasklet_schedule(&chan->cleanup_tasklet);
 293 }
 294
 295 static dma_cookie_t ccp_tx_submit(struct dma_async_tx_descriptor *tx_desc)
 296 {
 297         struct ccp_dma_desc *desc = container_of(tx_desc, struct ccp_dma_desc,
 298                                                  tx_desc);
 299         struct ccp_dma_chan *chan;
 300         dma_cookie_t cookie;
 301         unsigned long flags;
 302
 303         chan = container_of(tx_desc->chan, struct ccp_dma_chan, dma_chan);
 304
 305         spin_lock_irqsave(&chan->lock, flags);
 306
 307         cookie = dma_cookie_assign(tx_desc);
 308         list_del(&desc->entry);
 309         list_add_tail(&desc->entry, &chan->pending);
 310
 311         spin_unlock_irqrestore(&chan->lock, flags);
 312
 313         dev_dbg(chan->ccp->dev, "%s - added tx descriptor %d to pending list\n",
 314                 __func__, cookie);
 315
 316         return cookie;
 317 }
 318
 319 static struct ccp_dma_cmd *ccp_alloc_dma_cmd(struct ccp_dma_chan *chan)
 320 {
 321         struct ccp_dma_cmd *cmd;
 322
 323         cmd = kmem_cache_alloc(chan->ccp->dma_cmd_cache, GFP_NOWAIT);
 324         if (cmd)
 325                 memset(cmd, 0, sizeof(*cmd));
 326
 327         return cmd;
 328 }
 329
 330 static struct ccp_dma_desc *ccp_alloc_dma_desc(struct ccp_dma_chan *chan,
 331                                                unsigned long flags)
 332 {
 333         struct ccp_dma_desc *desc;
 334
 335         desc = kmem_cache_zalloc(chan->ccp->dma_desc_cache, GFP_NOWAIT);
 336         if (!desc)
 337                 return NULL;
 338
 339         dma_async_tx_descriptor_init(&desc->tx_desc, &chan->dma_chan);
 340         desc->tx_desc.flags = flags;
 341         desc->tx_desc.tx_submit = ccp_tx_submit;
 342         desc->ccp = chan->ccp;
 343         INIT_LIST_HEAD(&desc->pending);
 344         INIT_LIST_HEAD(&desc->active);
 345         desc->status = DMA_IN_PROGRESS;
 346
 347         return desc;
 348 }
 349
 350 static struct ccp_dma_desc *ccp_create_desc(struct dma_chan *dma_chan,
 351                                             struct scatterlist *dst_sg,
 352                                             unsigned int dst_nents,
 353                                             struct scatterlist *src_sg,
 354                                             unsigned int src_nents,
 355                                             unsigned long flags)
 356 {
 357         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 358                                                  dma_chan);
 359         struct ccp_device *ccp = chan->ccp;
 360         struct ccp_dma_desc *desc;
 361         struct ccp_dma_cmd *cmd;
 362         struct ccp_cmd *ccp_cmd;
 363         struct ccp_passthru_nomap_engine *ccp_pt;
 364         unsigned int src_offset, src_len;
 365         unsigned int dst_offset, dst_len;
 366         unsigned int len;
 367         unsigned long sflags;
 368         size_t total_len;
 369
 370         if (!dst_sg || !src_sg)
 371                 return NULL;
 372
 373         if (!dst_nents || !src_nents)
 374                 return NULL;
 375
 376         desc = ccp_alloc_dma_desc(chan, flags);
 377         if (!desc)
 378                 return NULL;
 379
 380         total_len = 0;
 381
 382         src_len = sg_dma_len(src_sg);
 383         src_offset = 0;
 384
 385         dst_len = sg_dma_len(dst_sg);
 386         dst_offset = 0;
 387
 388         while (true) {
 389                 if (!src_len) {
 390                         src_nents--;
 391                         if (!src_nents)
 392                                 break;
 393
 394                         src_sg = sg_next(src_sg);
 395                         if (!src_sg)
 396                                 break;
 397
 398                         src_len = sg_dma_len(src_sg);
 399                         src_offset = 0;
 400                         continue;
 401                 }
 402
 403                 if (!dst_len) {
 404                         dst_nents--;
 405                         if (!dst_nents)
 406                                 break;
 407
 408                         dst_sg = sg_next(dst_sg);
 409                         if (!dst_sg)
 410                                 break;
 411
 412                         dst_len = sg_dma_len(dst_sg);
 413                         dst_offset = 0;
 414                         continue;
 415                 }
 416
 417                 len = min(dst_len, src_len);
 418
 419                 cmd = ccp_alloc_dma_cmd(chan);
 420                 if (!cmd)
 421                         goto err;
 422
 423                 ccp_cmd = &cmd->ccp_cmd;
 424                 ccp_cmd->ccp = chan->ccp;
 425                 ccp_pt = &ccp_cmd->u.passthru_nomap;
 426                 ccp_cmd->flags = CCP_CMD_MAY_BACKLOG;
 427                 ccp_cmd->flags |= CCP_CMD_PASSTHRU_NO_DMA_MAP;
 428                 ccp_cmd->engine = CCP_ENGINE_PASSTHRU;
 429                 ccp_pt->bit_mod = CCP_PASSTHRU_BITWISE_NOOP;
 430                 ccp_pt->byte_swap = CCP_PASSTHRU_BYTESWAP_NOOP;
 431                 ccp_pt->src_dma = sg_dma_address(src_sg) + src_offset;
 432                 ccp_pt->dst_dma = sg_dma_address(dst_sg) + dst_offset;
 433                 ccp_pt->src_len = len;
 434                 ccp_pt->final = 1;
 435                 ccp_cmd->callback = ccp_cmd_callback;
 436                 ccp_cmd->data = desc;
 437
 438                 list_add_tail(&cmd->entry, &desc->pending);
 439
 440                 dev_dbg(ccp->dev,
 441                         "%s - cmd=%p, src=%pad, dst=%pad, len=%llu\n", __func__,
 442                         cmd, &ccp_pt->src_dma,
 443                         &ccp_pt->dst_dma, ccp_pt->src_len);
 444
 445                 total_len += len;
 446
 447                 src_len -= len;
 448                 src_offset += len;
 449
 450                 dst_len -= len;
 451                 dst_offset += len;
 452         }
 453
 454         desc->len = total_len;
 455
 456         if (list_empty(&desc->pending))
 457                 goto err;
 458
 459         dev_dbg(ccp->dev, "%s - desc=%p\n", __func__, desc);
 460
 461         spin_lock_irqsave(&chan->lock, sflags);
 462
 463         list_add_tail(&desc->entry, &chan->created);
 464
 465         spin_unlock_irqrestore(&chan->lock, sflags);
 466
 467         return desc;
 468
 469 err:
 470         ccp_free_cmd_resources(ccp, &desc->pending);
 471         kmem_cache_free(ccp->dma_desc_cache, desc);
 472
 473         return NULL;
 474 }
 475
 476 static struct dma_async_tx_descriptor *ccp_prep_dma_memcpy(
 477         struct dma_chan *dma_chan, dma_addr_t dst, dma_addr_t src, size_t len,
 478         unsigned long flags)
 479 {
 480         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 481                                                  dma_chan);
 482         struct ccp_dma_desc *desc;
 483         struct scatterlist dst_sg, src_sg;
 484
 485         dev_dbg(chan->ccp->dev,
 486                 "%s - src=%pad, dst=%pad, len=%zu, flags=%#lx\n",
 487                 __func__, &src, &dst, len, flags);
 488
 489         sg_init_table(&dst_sg, 1);
 490         sg_dma_address(&dst_sg) = dst;
 491         sg_dma_len(&dst_sg) = len;
 492
 493         sg_init_table(&src_sg, 1);
 494         sg_dma_address(&src_sg) = src;
 495         sg_dma_len(&src_sg) = len;
 496
 497         desc = ccp_create_desc(dma_chan, &dst_sg, 1, &src_sg, 1, flags);
 498         if (!desc)
 499                 return NULL;
 500
 501         return &desc->tx_desc;
 502 }
 503
 504 static struct dma_async_tx_descriptor *ccp_prep_dma_interrupt(
 505         struct dma_chan *dma_chan, unsigned long flags)
 506 {
 507         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 508                                                  dma_chan);
 509         struct ccp_dma_desc *desc;
 510
 511         desc = ccp_alloc_dma_desc(chan, flags);
 512         if (!desc)
 513                 return NULL;
 514
 515         return &desc->tx_desc;
 516 }
 517
 518 static void ccp_issue_pending(struct dma_chan *dma_chan)
 519 {
 520         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 521                                                  dma_chan);
 522         struct ccp_dma_desc *desc;
 523         unsigned long flags;
 524
 525         dev_dbg(chan->ccp->dev, "%s\n", __func__);
 526
 527         spin_lock_irqsave(&chan->lock, flags);
 528
 529         desc = __ccp_pending_to_active(chan);
 530
 531         spin_unlock_irqrestore(&chan->lock, flags);
 532
 533         /* If there was nothing active, start processing */
 534         if (desc)
 535                 ccp_cmd_callback(desc, 0);
 536 }
 537
 538 static enum dma_status ccp_tx_status(struct dma_chan *dma_chan,
 539                                      dma_cookie_t cookie,
 540                                      struct dma_tx_state *state)
 541 {
 542         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 543                                                  dma_chan);
 544         struct ccp_dma_desc *desc;
 545         enum dma_status ret;
 546         unsigned long flags;
 547
 548         if (chan->status == DMA_PAUSED) {
 549                 ret = DMA_PAUSED;
 550                 goto out;
 551         }
 552
 553         ret = dma_cookie_status(dma_chan, cookie, state);
 554         if (ret == DMA_COMPLETE) {
 555                 spin_lock_irqsave(&chan->lock, flags);
 556
 557                 /* Get status from complete chain, if still there */
 558                 list_for_each_entry(desc, &chan->complete, entry) {
 559                         if (desc->tx_desc.cookie != cookie)
 560                                 continue;
 561
 562                         ret = desc->status;
 563                         break;
 564                 }
 565
 566                 spin_unlock_irqrestore(&chan->lock, flags);
 567         }
 568
 569 out:
 570         dev_dbg(chan->ccp->dev, "%s - %u\n", __func__, ret);
 571
 572         return ret;
 573 }
 574
 575 static int ccp_pause(struct dma_chan *dma_chan)
 576 {
 577         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 578                                                  dma_chan);
 579
 580         chan->status = DMA_PAUSED;
 581
 582         /*TODO: Wait for active DMA to complete before returning? */
 583
 584         return 0;
 585 }
 586
 587 static int ccp_resume(struct dma_chan *dma_chan)
 588 {
 589         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 590                                                  dma_chan);
 591         struct ccp_dma_desc *desc;
 592         unsigned long flags;
 593
 594         spin_lock_irqsave(&chan->lock, flags);
 595
 596         desc = list_first_entry_or_null(&chan->active, struct ccp_dma_desc,
 597                                         entry);
 598
 599         spin_unlock_irqrestore(&chan->lock, flags);
 600
 601         /* Indicate the channel is running again */
 602         chan->status = DMA_IN_PROGRESS;
 603
 604         /* If there was something active, re-start */
 605         if (desc)
 606                 ccp_cmd_callback(desc, 0);
 607
 608         return 0;
 609 }
 610
 611 static int ccp_terminate_all(struct dma_chan *dma_chan)
 612 {
 613         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 614                                                  dma_chan);
 615         unsigned long flags;
 616
 617         dev_dbg(chan->ccp->dev, "%s\n", __func__);
 618
 619         /*TODO: Wait for active DMA to complete before continuing */
 620
 621         spin_lock_irqsave(&chan->lock, flags);
 622
 623         /*TODO: Purge the complete list? */
 624         ccp_free_desc_resources(chan->ccp, &chan->active);
 625         ccp_free_desc_resources(chan->ccp, &chan->pending);
 626         ccp_free_desc_resources(chan->ccp, &chan->created);
 627
 628         spin_unlock_irqrestore(&chan->lock, flags);
 629
 630         return 0;
 631 }
 632
 633 int ccp_dmaengine_register(struct ccp_device *ccp)
 634 {
 635         struct ccp_dma_chan *chan;
 636         struct dma_device *dma_dev = &ccp->dma_dev;
 637         struct dma_chan *dma_chan;
 638         char *dma_cmd_cache_name;
 639         char *dma_desc_cache_name;
 640         unsigned int i;
 641         int ret;
 642
 643         ccp->ccp_dma_chan = devm_kcalloc(ccp->dev, ccp->cmd_q_count,
 644                                          sizeof(*(ccp->ccp_dma_chan)),
 645                                          GFP_KERNEL);
 646         if (!ccp->ccp_dma_chan)
 647                 return -ENOMEM;
 648
 649         dma_cmd_cache_name = devm_kasprintf(ccp->dev, GFP_KERNEL,
 650                                             "%s-dmaengine-cmd-cache",
 651                                             ccp->name);
 652         if (!dma_cmd_cache_name)
 653                 return -ENOMEM;
 654
 655         ccp->dma_cmd_cache = kmem_cache_create(dma_cmd_cache_name,
 656                                                sizeof(struct ccp_dma_cmd),
 657                                                sizeof(void *),
 658                                                SLAB_HWCACHE_ALIGN, NULL);
 659         if (!ccp->dma_cmd_cache)
 660                 return -ENOMEM;
 661
 662         dma_desc_cache_name = devm_kasprintf(ccp->dev, GFP_KERNEL,
 663                                              "%s-dmaengine-desc-cache",
 664                                              ccp->name);
 665         if (!dma_desc_cache_name) {
 666                 ret = -ENOMEM;
 667                 goto err_cache;
 668         }
 669
 670         ccp->dma_desc_cache = kmem_cache_create(dma_desc_cache_name,
 671                                                 sizeof(struct ccp_dma_desc),
 672                                                 sizeof(void *),
 673                                                 SLAB_HWCACHE_ALIGN, NULL);
 674         if (!ccp->dma_desc_cache) {
 675                 ret = -ENOMEM;
 676                 goto err_cache;
 677         }
 678
 679         dma_dev->dev = ccp->dev;
 680         dma_dev->src_addr_widths = CCP_DMA_WIDTH(dma_get_mask(ccp->dev));
 681         dma_dev->dst_addr_widths = CCP_DMA_WIDTH(dma_get_mask(ccp->dev));
 682         dma_dev->directions = DMA_MEM_TO_MEM;
 683         dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
 684         dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
 685         dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask);
 686
 687         /* The DMA channels for this device can be set to public or private,
 688          * and overridden by the module parameter dma_chan_attr.
 689          * Default: according to the value in vdata (dma_chan_attr=0)
 690          * dma_chan_attr=0x1: all channels private (override vdata)
 691          * dma_chan_attr=0x2: all channels public (override vdata)
 692          */
 693         if (ccp_get_dma_chan_attr(ccp) == DMA_PRIVATE)
 694                 dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
 695
 696         INIT_LIST_HEAD(&dma_dev->channels);
 697         for (i = 0; i < ccp->cmd_q_count; i++) {
 698                 chan = ccp->ccp_dma_chan + i;
 699                 dma_chan = &chan->dma_chan;
 700
 701                 chan->ccp = ccp;
 702
 703                 spin_lock_init(&chan->lock);
 704                 INIT_LIST_HEAD(&chan->created);
 705                 INIT_LIST_HEAD(&chan->pending);
 706                 INIT_LIST_HEAD(&chan->active);
 707                 INIT_LIST_HEAD(&chan->complete);
 708
 709                 tasklet_init(&chan->cleanup_tasklet, ccp_do_cleanup,
 710                              (unsigned long)chan);
 711
 712                 dma_chan->device = dma_dev;
 713                 dma_cookie_init(dma_chan);
 714
 715                 list_add_tail(&dma_chan->device_node, &dma_dev->channels);
 716         }
 717
 718         dma_dev->device_free_chan_resources = ccp_free_chan_resources;
 719         dma_dev->device_prep_dma_memcpy = ccp_prep_dma_memcpy;
 720         dma_dev->device_prep_dma_interrupt = ccp_prep_dma_interrupt;
 721         dma_dev->device_issue_pending = ccp_issue_pending;
 722         dma_dev->device_tx_status = ccp_tx_status;
 723         dma_dev->device_pause = ccp_pause;
 724         dma_dev->device_resume = ccp_resume;
 725         dma_dev->device_terminate_all = ccp_terminate_all;
 726
 727         ret = dma_async_device_register(dma_dev);
 728         if (ret)
 729                 goto err_reg;
 730
 731         return 0;
 732
 733 err_reg:
 734         kmem_cache_destroy(ccp->dma_desc_cache);
 735
 736 err_cache:
 737         kmem_cache_destroy(ccp->dma_cmd_cache);
 738
 739         return ret;
 740 }
 741
 742 void ccp_dmaengine_unregister(struct ccp_device *ccp)
 743 {
 744         struct dma_device *dma_dev = &ccp->dma_dev;
 745
 746         dma_async_device_unregister(dma_dev);
 747
 748         kmem_cache_destroy(ccp->dma_desc_cache);
 749         kmem_cache_destroy(ccp->dma_cmd_cache);
 750 }