drivers/crypto/ccp/ccp-dmaengine.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AMD Cryptographic Coprocessor (CCP) driver
   4  *
   5  * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
   6  *
   7  * Author: Gary R Hook <gary.hook@amd.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/dmaengine.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/mutex.h>
  16 #include <linux/ccp.h>
  17
  18 #include "ccp-dev.h"
  19 #include "../../dma/dmaengine.h"
  20
  21 #define CCP_DMA_WIDTH(_mask)            \
  22 ({                                      \
  23         u64 mask = _mask + 1;           \
  24         (mask == 0) ? 64 : fls64(mask); \
  25 })
  26
  27 /* The CCP as a DMA provider can be configured for public or private
  28  * channels. Default is specified in the vdata for the device (PCI ID).
  29  * This module parameter will override for all channels on all devices:
  30  *   dma_chan_attr = 0x2 to force all channels public
  31  *                 = 0x1 to force all channels private
  32  *                 = 0x0 to defer to the vdata setting
  33  *                 = any other value: warning, revert to 0x0
  34  */
  35 static unsigned int dma_chan_attr = CCP_DMA_DFLT;
  36 module_param(dma_chan_attr, uint, 0444);
  37 MODULE_PARM_DESC(dma_chan_attr, "Set DMA channel visibility: 0 (default) = device defaults, 1 = make private, 2 = make public");
  38
  39 static unsigned int dmaengine = 1;
  40 module_param(dmaengine, uint, 0444);
  41 MODULE_PARM_DESC(dmaengine, "Register services with the DMA subsystem (any non-zero value, default: 1)");
  42
  43 static unsigned int ccp_get_dma_chan_attr(struct ccp_device *ccp)
  44 {
  45         switch (dma_chan_attr) {
  46         case CCP_DMA_DFLT:
  47                 return ccp->vdata->dma_chan_attr;
  48
  49         case CCP_DMA_PRIV:
  50                 return DMA_PRIVATE;
  51
  52         case CCP_DMA_PUB:
  53                 return 0;
  54
  55         default:
  56                 dev_info_once(ccp->dev, "Invalid value for dma_chan_attr: %d\n",
  57                               dma_chan_attr);
  58                 return ccp->vdata->dma_chan_attr;
  59         }
  60 }
  61
  62 static void ccp_free_cmd_resources(struct ccp_device *ccp,
  63                                    struct list_head *list)
  64 {
  65         struct ccp_dma_cmd *cmd, *ctmp;
  66
  67         list_for_each_entry_safe(cmd, ctmp, list, entry) {
  68                 list_del(&cmd->entry);
  69                 kmem_cache_free(ccp->dma_cmd_cache, cmd);
  70         }
  71 }
  72
  73 static void ccp_free_desc_resources(struct ccp_device *ccp,
  74                                     struct list_head *list)
  75 {
  76         struct ccp_dma_desc *desc, *dtmp;
  77
  78         list_for_each_entry_safe(desc, dtmp, list, entry) {
  79                 ccp_free_cmd_resources(ccp, &desc->active);
  80                 ccp_free_cmd_resources(ccp, &desc->pending);
  81
  82                 list_del(&desc->entry);
  83                 kmem_cache_free(ccp->dma_desc_cache, desc);
  84         }
  85 }
  86
  87 static void ccp_free_chan_resources(struct dma_chan *dma_chan)
  88 {
  89         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
  90                                                  dma_chan);
  91         unsigned long flags;
  92
  93         dev_dbg(chan->ccp->dev, "%s - chan=%p\n", __func__, chan);
  94
  95         spin_lock_irqsave(&chan->lock, flags);
  96
  97         ccp_free_desc_resources(chan->ccp, &chan->complete);
  98         ccp_free_desc_resources(chan->ccp, &chan->active);
  99         ccp_free_desc_resources(chan->ccp, &chan->pending);
 100         ccp_free_desc_resources(chan->ccp, &chan->created);
 101
 102         spin_unlock_irqrestore(&chan->lock, flags);
 103 }
 104
 105 static void ccp_cleanup_desc_resources(struct ccp_device *ccp,
 106                                        struct list_head *list)
 107 {
 108         struct ccp_dma_desc *desc, *dtmp;
 109
 110         list_for_each_entry_safe_reverse(desc, dtmp, list, entry) {
 111                 if (!async_tx_test_ack(&desc->tx_desc))
 112                         continue;
 113
 114                 dev_dbg(ccp->dev, "%s - desc=%p\n", __func__, desc);
 115
 116                 ccp_free_cmd_resources(ccp, &desc->active);
 117                 ccp_free_cmd_resources(ccp, &desc->pending);
 118
 119                 list_del(&desc->entry);
 120                 kmem_cache_free(ccp->dma_desc_cache, desc);
 121         }
 122 }
 123
 124 static void ccp_do_cleanup(unsigned long data)
 125 {
 126         struct ccp_dma_chan *chan = (struct ccp_dma_chan *)data;
 127         unsigned long flags;
 128
 129         dev_dbg(chan->ccp->dev, "%s - chan=%s\n", __func__,
 130                 dma_chan_name(&chan->dma_chan));
 131
 132         spin_lock_irqsave(&chan->lock, flags);
 133
 134         ccp_cleanup_desc_resources(chan->ccp, &chan->complete);
 135
 136         spin_unlock_irqrestore(&chan->lock, flags);
 137 }
 138
 139 static int ccp_issue_next_cmd(struct ccp_dma_desc *desc)
 140 {
 141         struct ccp_dma_cmd *cmd;
 142         int ret;
 143
 144         cmd = list_first_entry(&desc->pending, struct ccp_dma_cmd, entry);
 145         list_move(&cmd->entry, &desc->active);
 146
 147         dev_dbg(desc->ccp->dev, "%s - tx %d, cmd=%p\n", __func__,
 148                 desc->tx_desc.cookie, cmd);
 149
 150         ret = ccp_enqueue_cmd(&cmd->ccp_cmd);
 151         if (!ret || (ret == -EINPROGRESS) || (ret == -EBUSY))
 152                 return 0;
 153
 154         dev_dbg(desc->ccp->dev, "%s - error: ret=%d, tx %d, cmd=%p\n", __func__,
 155                 ret, desc->tx_desc.cookie, cmd);
 156
 157         return ret;
 158 }
 159
 160 static void ccp_free_active_cmd(struct ccp_dma_desc *desc)
 161 {
 162         struct ccp_dma_cmd *cmd;
 163
 164         cmd = list_first_entry_or_null(&desc->active, struct ccp_dma_cmd,
 165                                        entry);
 166         if (!cmd)
 167                 return;
 168
 169         dev_dbg(desc->ccp->dev, "%s - freeing tx %d cmd=%p\n",
 170                 __func__, desc->tx_desc.cookie, cmd);
 171
 172         list_del(&cmd->entry);
 173         kmem_cache_free(desc->ccp->dma_cmd_cache, cmd);
 174 }
 175
 176 static struct ccp_dma_desc *__ccp_next_dma_desc(struct ccp_dma_chan *chan,
 177                                                 struct ccp_dma_desc *desc)
 178 {
 179         /* Move current DMA descriptor to the complete list */
 180         if (desc)
 181                 list_move(&desc->entry, &chan->complete);
 182
 183         /* Get the next DMA descriptor on the active list */
 184         desc = list_first_entry_or_null(&chan->active, struct ccp_dma_desc,
 185                                         entry);
 186
 187         return desc;
 188 }
 189
 190 static struct ccp_dma_desc *ccp_handle_active_desc(struct ccp_dma_chan *chan,
 191                                                    struct ccp_dma_desc *desc)
 192 {
 193         struct dma_async_tx_descriptor *tx_desc;
 194         unsigned long flags;
 195
 196         /* Loop over descriptors until one is found with commands */
 197         do {
 198                 if (desc) {
 199                         /* Remove the DMA command from the list and free it */
 200                         ccp_free_active_cmd(desc);
 201
 202                         if (!list_empty(&desc->pending)) {
 203                                 /* No errors, keep going */
 204                                 if (desc->status != DMA_ERROR)
 205                                         return desc;
 206
 207                                 /* Error, free remaining commands and move on */
 208                                 ccp_free_cmd_resources(desc->ccp,
 209                                                        &desc->pending);
 210                         }
 211
 212                         tx_desc = &desc->tx_desc;
 213                 } else {
 214                         tx_desc = NULL;
 215                 }
 216
 217                 spin_lock_irqsave(&chan->lock, flags);
 218
 219                 if (desc) {
 220                         if (desc->status != DMA_ERROR)
 221                                 desc->status = DMA_COMPLETE;
 222
 223                         dev_dbg(desc->ccp->dev,
 224                                 "%s - tx %d complete, status=%u\n", __func__,
 225                                 desc->tx_desc.cookie, desc->status);
 226
 227                         dma_cookie_complete(tx_desc);
 228                         dma_descriptor_unmap(tx_desc);
 229                 }
 230
 231                 desc = __ccp_next_dma_desc(chan, desc);
 232
 233                 spin_unlock_irqrestore(&chan->lock, flags);
 234
 235                 if (tx_desc) {
 236                         dmaengine_desc_get_callback_invoke(tx_desc, NULL);
 237
 238                         dma_run_dependencies(tx_desc);
 239                 }
 240         } while (desc);
 241
 242         return NULL;
 243 }
 244
 245 static struct ccp_dma_desc *__ccp_pending_to_active(struct ccp_dma_chan *chan)
 246 {
 247         struct ccp_dma_desc *desc;
 248
 249         if (list_empty(&chan->pending))
 250                 return NULL;
 251
 252         desc = list_empty(&chan->active)
 253                 ? list_first_entry(&chan->pending, struct ccp_dma_desc, entry)
 254                 : NULL;
 255
 256         list_splice_tail_init(&chan->pending, &chan->active);
 257
 258         return desc;
 259 }
 260
 261 static void ccp_cmd_callback(void *data, int err)
 262 {
 263         struct ccp_dma_desc *desc = data;
 264         struct ccp_dma_chan *chan;
 265         int ret;
 266
 267         if (err == -EINPROGRESS)
 268                 return;
 269
 270         chan = container_of(desc->tx_desc.chan, struct ccp_dma_chan,
 271                             dma_chan);
 272
 273         dev_dbg(chan->ccp->dev, "%s - tx %d callback, err=%d\n",
 274                 __func__, desc->tx_desc.cookie, err);
 275
 276         if (err)
 277                 desc->status = DMA_ERROR;
 278
 279         while (true) {
 280                 /* Check for DMA descriptor completion */
 281                 desc = ccp_handle_active_desc(chan, desc);
 282
 283                 /* Don't submit cmd if no descriptor or DMA is paused */
 284                 if (!desc || (chan->status == DMA_PAUSED))
 285                         break;
 286
 287                 ret = ccp_issue_next_cmd(desc);
 288                 if (!ret)
 289                         break;
 290
 291                 desc->status = DMA_ERROR;
 292         }
 293
 294         tasklet_schedule(&chan->cleanup_tasklet);
 295 }
 296
 297 static dma_cookie_t ccp_tx_submit(struct dma_async_tx_descriptor *tx_desc)
 298 {
 299         struct ccp_dma_desc *desc = container_of(tx_desc, struct ccp_dma_desc,
 300                                                  tx_desc);
 301         struct ccp_dma_chan *chan;
 302         dma_cookie_t cookie;
 303         unsigned long flags;
 304
 305         chan = container_of(tx_desc->chan, struct ccp_dma_chan, dma_chan);
 306
 307         spin_lock_irqsave(&chan->lock, flags);
 308
 309         cookie = dma_cookie_assign(tx_desc);
 310         list_move_tail(&desc->entry, &chan->pending);
 311
 312         spin_unlock_irqrestore(&chan->lock, flags);
 313
 314         dev_dbg(chan->ccp->dev, "%s - added tx descriptor %d to pending list\n",
 315                 __func__, cookie);
 316
 317         return cookie;
 318 }
 319
 320 static struct ccp_dma_cmd *ccp_alloc_dma_cmd(struct ccp_dma_chan *chan)
 321 {
 322         struct ccp_dma_cmd *cmd;
 323
 324         cmd = kmem_cache_alloc(chan->ccp->dma_cmd_cache, GFP_NOWAIT);
 325         if (cmd)
 326                 memset(cmd, 0, sizeof(*cmd));
 327
 328         return cmd;
 329 }
 330
 331 static struct ccp_dma_desc *ccp_alloc_dma_desc(struct ccp_dma_chan *chan,
 332                                                unsigned long flags)
 333 {
 334         struct ccp_dma_desc *desc;
 335
 336         desc = kmem_cache_zalloc(chan->ccp->dma_desc_cache, GFP_NOWAIT);
 337         if (!desc)
 338                 return NULL;
 339
 340         dma_async_tx_descriptor_init(&desc->tx_desc, &chan->dma_chan);
 341         desc->tx_desc.flags = flags;
 342         desc->tx_desc.tx_submit = ccp_tx_submit;
 343         desc->ccp = chan->ccp;
 344         INIT_LIST_HEAD(&desc->entry);
 345         INIT_LIST_HEAD(&desc->pending);
 346         INIT_LIST_HEAD(&desc->active);
 347         desc->status = DMA_IN_PROGRESS;
 348
 349         return desc;
 350 }
 351
 352 static struct ccp_dma_desc *ccp_create_desc(struct dma_chan *dma_chan,
 353                                             struct scatterlist *dst_sg,
 354                                             unsigned int dst_nents,
 355                                             struct scatterlist *src_sg,
 356                                             unsigned int src_nents,
 357                                             unsigned long flags)
 358 {
 359         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 360                                                  dma_chan);
 361         struct ccp_device *ccp = chan->ccp;
 362         struct ccp_dma_desc *desc;
 363         struct ccp_dma_cmd *cmd;
 364         struct ccp_cmd *ccp_cmd;
 365         struct ccp_passthru_nomap_engine *ccp_pt;
 366         unsigned int src_offset, src_len;
 367         unsigned int dst_offset, dst_len;
 368         unsigned int len;
 369         unsigned long sflags;
 370         size_t total_len;
 371
 372         if (!dst_sg || !src_sg)
 373                 return NULL;
 374
 375         if (!dst_nents || !src_nents)
 376                 return NULL;
 377
 378         desc = ccp_alloc_dma_desc(chan, flags);
 379         if (!desc)
 380                 return NULL;
 381
 382         total_len = 0;
 383
 384         src_len = sg_dma_len(src_sg);
 385         src_offset = 0;
 386
 387         dst_len = sg_dma_len(dst_sg);
 388         dst_offset = 0;
 389
 390         while (true) {
 391                 if (!src_len) {
 392                         src_nents--;
 393                         if (!src_nents)
 394                                 break;
 395
 396                         src_sg = sg_next(src_sg);
 397                         if (!src_sg)
 398                                 break;
 399
 400                         src_len = sg_dma_len(src_sg);
 401                         src_offset = 0;
 402                         continue;
 403                 }
 404
 405                 if (!dst_len) {
 406                         dst_nents--;
 407                         if (!dst_nents)
 408                                 break;
 409
 410                         dst_sg = sg_next(dst_sg);
 411                         if (!dst_sg)
 412                                 break;
 413
 414                         dst_len = sg_dma_len(dst_sg);
 415                         dst_offset = 0;
 416                         continue;
 417                 }
 418
 419                 len = min(dst_len, src_len);
 420
 421                 cmd = ccp_alloc_dma_cmd(chan);
 422                 if (!cmd)
 423                         goto err;
 424
 425                 ccp_cmd = &cmd->ccp_cmd;
 426                 ccp_cmd->ccp = chan->ccp;
 427                 ccp_pt = &ccp_cmd->u.passthru_nomap;
 428                 ccp_cmd->flags = CCP_CMD_MAY_BACKLOG;
 429                 ccp_cmd->flags |= CCP_CMD_PASSTHRU_NO_DMA_MAP;
 430                 ccp_cmd->engine = CCP_ENGINE_PASSTHRU;
 431                 ccp_pt->bit_mod = CCP_PASSTHRU_BITWISE_NOOP;
 432                 ccp_pt->byte_swap = CCP_PASSTHRU_BYTESWAP_NOOP;
 433                 ccp_pt->src_dma = sg_dma_address(src_sg) + src_offset;
 434                 ccp_pt->dst_dma = sg_dma_address(dst_sg) + dst_offset;
 435                 ccp_pt->src_len = len;
 436                 ccp_pt->final = 1;
 437                 ccp_cmd->callback = ccp_cmd_callback;
 438                 ccp_cmd->data = desc;
 439
 440                 list_add_tail(&cmd->entry, &desc->pending);
 441
 442                 dev_dbg(ccp->dev,
 443                         "%s - cmd=%p, src=%pad, dst=%pad, len=%llu\n", __func__,
 444                         cmd, &ccp_pt->src_dma,
 445                         &ccp_pt->dst_dma, ccp_pt->src_len);
 446
 447                 total_len += len;
 448
 449                 src_len -= len;
 450                 src_offset += len;
 451
 452                 dst_len -= len;
 453                 dst_offset += len;
 454         }
 455
 456         desc->len = total_len;
 457
 458         if (list_empty(&desc->pending))
 459                 goto err;
 460
 461         dev_dbg(ccp->dev, "%s - desc=%p\n", __func__, desc);
 462
 463         spin_lock_irqsave(&chan->lock, sflags);
 464
 465         list_add_tail(&desc->entry, &chan->created);
 466
 467         spin_unlock_irqrestore(&chan->lock, sflags);
 468
 469         return desc;
 470
 471 err:
 472         ccp_free_cmd_resources(ccp, &desc->pending);
 473         kmem_cache_free(ccp->dma_desc_cache, desc);
 474
 475         return NULL;
 476 }
 477
 478 static struct dma_async_tx_descriptor *ccp_prep_dma_memcpy(
 479         struct dma_chan *dma_chan, dma_addr_t dst, dma_addr_t src, size_t len,
 480         unsigned long flags)
 481 {
 482         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 483                                                  dma_chan);
 484         struct ccp_dma_desc *desc;
 485         struct scatterlist dst_sg, src_sg;
 486
 487         dev_dbg(chan->ccp->dev,
 488                 "%s - src=%pad, dst=%pad, len=%zu, flags=%#lx\n",
 489                 __func__, &src, &dst, len, flags);
 490
 491         sg_init_table(&dst_sg, 1);
 492         sg_dma_address(&dst_sg) = dst;
 493         sg_dma_len(&dst_sg) = len;
 494
 495         sg_init_table(&src_sg, 1);
 496         sg_dma_address(&src_sg) = src;
 497         sg_dma_len(&src_sg) = len;
 498
 499         desc = ccp_create_desc(dma_chan, &dst_sg, 1, &src_sg, 1, flags);
 500         if (!desc)
 501                 return NULL;
 502
 503         return &desc->tx_desc;
 504 }
 505
 506 static struct dma_async_tx_descriptor *ccp_prep_dma_interrupt(
 507         struct dma_chan *dma_chan, unsigned long flags)
 508 {
 509         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 510                                                  dma_chan);
 511         struct ccp_dma_desc *desc;
 512
 513         desc = ccp_alloc_dma_desc(chan, flags);
 514         if (!desc)
 515                 return NULL;
 516
 517         return &desc->tx_desc;
 518 }
 519
 520 static void ccp_issue_pending(struct dma_chan *dma_chan)
 521 {
 522         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 523                                                  dma_chan);
 524         struct ccp_dma_desc *desc;
 525         unsigned long flags;
 526
 527         dev_dbg(chan->ccp->dev, "%s\n", __func__);
 528
 529         spin_lock_irqsave(&chan->lock, flags);
 530
 531         desc = __ccp_pending_to_active(chan);
 532
 533         spin_unlock_irqrestore(&chan->lock, flags);
 534
 535         /* If there was nothing active, start processing */
 536         if (desc)
 537                 ccp_cmd_callback(desc, 0);
 538 }
 539
 540 static enum dma_status ccp_tx_status(struct dma_chan *dma_chan,
 541                                      dma_cookie_t cookie,
 542                                      struct dma_tx_state *state)
 543 {
 544         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 545                                                  dma_chan);
 546         struct ccp_dma_desc *desc;
 547         enum dma_status ret;
 548         unsigned long flags;
 549
 550         if (chan->status == DMA_PAUSED) {
 551                 ret = DMA_PAUSED;
 552                 goto out;
 553         }
 554
 555         ret = dma_cookie_status(dma_chan, cookie, state);
 556         if (ret == DMA_COMPLETE) {
 557                 spin_lock_irqsave(&chan->lock, flags);
 558
 559                 /* Get status from complete chain, if still there */
 560                 list_for_each_entry(desc, &chan->complete, entry) {
 561                         if (desc->tx_desc.cookie != cookie)
 562                                 continue;
 563
 564                         ret = desc->status;
 565                         break;
 566                 }
 567
 568                 spin_unlock_irqrestore(&chan->lock, flags);
 569         }
 570
 571 out:
 572         dev_dbg(chan->ccp->dev, "%s - %u\n", __func__, ret);
 573
 574         return ret;
 575 }
 576
 577 static int ccp_pause(struct dma_chan *dma_chan)
 578 {
 579         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 580                                                  dma_chan);
 581
 582         chan->status = DMA_PAUSED;
 583
 584         /*TODO: Wait for active DMA to complete before returning? */
 585
 586         return 0;
 587 }
 588
 589 static int ccp_resume(struct dma_chan *dma_chan)
 590 {
 591         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 592                                                  dma_chan);
 593         struct ccp_dma_desc *desc;
 594         unsigned long flags;
 595
 596         spin_lock_irqsave(&chan->lock, flags);
 597
 598         desc = list_first_entry_or_null(&chan->active, struct ccp_dma_desc,
 599                                         entry);
 600
 601         spin_unlock_irqrestore(&chan->lock, flags);
 602
 603         /* Indicate the channel is running again */
 604         chan->status = DMA_IN_PROGRESS;
 605
 606         /* If there was something active, re-start */
 607         if (desc)
 608                 ccp_cmd_callback(desc, 0);
 609
 610         return 0;
 611 }
 612
 613 static int ccp_terminate_all(struct dma_chan *dma_chan)
 614 {
 615         struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
 616                                                  dma_chan);
 617         unsigned long flags;
 618
 619         dev_dbg(chan->ccp->dev, "%s\n", __func__);
 620
 621         /*TODO: Wait for active DMA to complete before continuing */
 622
 623         spin_lock_irqsave(&chan->lock, flags);
 624
 625         /*TODO: Purge the complete list? */
 626         ccp_free_desc_resources(chan->ccp, &chan->active);
 627         ccp_free_desc_resources(chan->ccp, &chan->pending);
 628         ccp_free_desc_resources(chan->ccp, &chan->created);
 629
 630         spin_unlock_irqrestore(&chan->lock, flags);
 631
 632         return 0;
 633 }
 634
 635 static void ccp_dma_release(struct ccp_device *ccp)
 636 {
 637         struct ccp_dma_chan *chan;
 638         struct dma_chan *dma_chan;
 639         unsigned int i;
 640
 641         for (i = 0; i < ccp->cmd_q_count; i++) {
 642                 chan = ccp->ccp_dma_chan + i;
 643                 dma_chan = &chan->dma_chan;
 644
 645                 tasklet_kill(&chan->cleanup_tasklet);
 646                 list_del_rcu(&dma_chan->device_node);
 647         }
 648 }
 649
 650 static void ccp_dma_release_channels(struct ccp_device *ccp)
 651 {
 652         struct ccp_dma_chan *chan;
 653         struct dma_chan *dma_chan;
 654         unsigned int i;
 655
 656         for (i = 0; i < ccp->cmd_q_count; i++) {
 657                 chan = ccp->ccp_dma_chan + i;
 658                 dma_chan = &chan->dma_chan;
 659
 660                 if (dma_chan->client_count)
 661                         dma_release_channel(dma_chan);
 662         }
 663 }
 664
 665 int ccp_dmaengine_register(struct ccp_device *ccp)
 666 {
 667         struct ccp_dma_chan *chan;
 668         struct dma_device *dma_dev = &ccp->dma_dev;
 669         struct dma_chan *dma_chan;
 670         char *dma_cmd_cache_name;
 671         char *dma_desc_cache_name;
 672         unsigned int i;
 673         int ret;
 674
 675         if (!dmaengine)
 676                 return 0;
 677
 678         ccp->ccp_dma_chan = devm_kcalloc(ccp->dev, ccp->cmd_q_count,
 679                                          sizeof(*(ccp->ccp_dma_chan)),
 680                                          GFP_KERNEL);
 681         if (!ccp->ccp_dma_chan)
 682                 return -ENOMEM;
 683
 684         dma_cmd_cache_name = devm_kasprintf(ccp->dev, GFP_KERNEL,
 685                                             "%s-dmaengine-cmd-cache",
 686                                             ccp->name);
 687         if (!dma_cmd_cache_name)
 688                 return -ENOMEM;
 689
 690         ccp->dma_cmd_cache = kmem_cache_create(dma_cmd_cache_name,
 691                                                sizeof(struct ccp_dma_cmd),
 692                                                sizeof(void *),
 693                                                SLAB_HWCACHE_ALIGN, NULL);
 694         if (!ccp->dma_cmd_cache)
 695                 return -ENOMEM;
 696
 697         dma_desc_cache_name = devm_kasprintf(ccp->dev, GFP_KERNEL,
 698                                              "%s-dmaengine-desc-cache",
 699                                              ccp->name);
 700         if (!dma_desc_cache_name) {
 701                 ret = -ENOMEM;
 702                 goto err_cache;
 703         }
 704
 705         ccp->dma_desc_cache = kmem_cache_create(dma_desc_cache_name,
 706                                                 sizeof(struct ccp_dma_desc),
 707                                                 sizeof(void *),
 708                                                 SLAB_HWCACHE_ALIGN, NULL);
 709         if (!ccp->dma_desc_cache) {
 710                 ret = -ENOMEM;
 711                 goto err_cache;
 712         }
 713
 714         dma_dev->dev = ccp->dev;
 715         dma_dev->src_addr_widths = CCP_DMA_WIDTH(dma_get_mask(ccp->dev));
 716         dma_dev->dst_addr_widths = CCP_DMA_WIDTH(dma_get_mask(ccp->dev));
 717         dma_dev->directions = DMA_MEM_TO_MEM;
 718         dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
 719         dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
 720         dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask);
 721
 722         /* The DMA channels for this device can be set to public or private,
 723          * and overridden by the module parameter dma_chan_attr.
 724          * Default: according to the value in vdata (dma_chan_attr=0)
 725          * dma_chan_attr=0x1: all channels private (override vdata)
 726          * dma_chan_attr=0x2: all channels public (override vdata)
 727          */
 728         if (ccp_get_dma_chan_attr(ccp) == DMA_PRIVATE)
 729                 dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
 730
 731         INIT_LIST_HEAD(&dma_dev->channels);
 732         for (i = 0; i < ccp->cmd_q_count; i++) {
 733                 chan = ccp->ccp_dma_chan + i;
 734                 dma_chan = &chan->dma_chan;
 735
 736                 chan->ccp = ccp;
 737
 738                 spin_lock_init(&chan->lock);
 739                 INIT_LIST_HEAD(&chan->created);
 740                 INIT_LIST_HEAD(&chan->pending);
 741                 INIT_LIST_HEAD(&chan->active);
 742                 INIT_LIST_HEAD(&chan->complete);
 743
 744                 tasklet_init(&chan->cleanup_tasklet, ccp_do_cleanup,
 745                              (unsigned long)chan);
 746
 747                 dma_chan->device = dma_dev;
 748                 dma_cookie_init(dma_chan);
 749
 750                 list_add_tail(&dma_chan->device_node, &dma_dev->channels);
 751         }
 752
 753         dma_dev->device_free_chan_resources = ccp_free_chan_resources;
 754         dma_dev->device_prep_dma_memcpy = ccp_prep_dma_memcpy;
 755         dma_dev->device_prep_dma_interrupt = ccp_prep_dma_interrupt;
 756         dma_dev->device_issue_pending = ccp_issue_pending;
 757         dma_dev->device_tx_status = ccp_tx_status;
 758         dma_dev->device_pause = ccp_pause;
 759         dma_dev->device_resume = ccp_resume;
 760         dma_dev->device_terminate_all = ccp_terminate_all;
 761
 762         ret = dma_async_device_register(dma_dev);
 763         if (ret)
 764                 goto err_reg;
 765
 766         return 0;
 767
 768 err_reg:
 769         ccp_dma_release(ccp);
 770         kmem_cache_destroy(ccp->dma_desc_cache);
 771
 772 err_cache:
 773         kmem_cache_destroy(ccp->dma_cmd_cache);
 774
 775         return ret;
 776 }
 777
 778 void ccp_dmaengine_unregister(struct ccp_device *ccp)
 779 {
 780         struct dma_device *dma_dev = &ccp->dma_dev;
 781
 782         if (!dmaengine)
 783                 return;
 784
 785         ccp_dma_release_channels(ccp);
 786         dma_async_device_unregister(dma_dev);
 787         ccp_dma_release(ccp);
 788
 789         kmem_cache_destroy(ccp->dma_desc_cache);
 790         kmem_cache_destroy(ccp->dma_cmd_cache);
 791 }