drivers/dma/iop-adma.c

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This source file includes following definitions.
iop_adma_free_slots
iop_adma_run_tx_complete_actions
iop_adma_clean_slot
__iop_adma_slot_cleanup
iop_adma_slot_cleanup
iop_adma_tasklet
iop_adma_alloc_slots
iop_adma_check_threshold
iop_adma_tx_submit
iop_adma_alloc_chan_resources
iop_adma_prep_dma_interrupt
iop_adma_prep_dma_memcpy
iop_adma_prep_dma_xor
iop_adma_prep_dma_xor_val
iop_adma_prep_dma_pq
iop_adma_prep_dma_pq_val
iop_adma_free_chan_resources
iop_adma_status
iop_adma_eot_handler
iop_adma_eoc_handler
iop_adma_err_handler
iop_adma_issue_pending
iop_adma_memcpy_self_test
iop_adma_xor_val_self_test
iop_adma_pq_zero_sum_self_test
iop_adma_remove
iop_adma_probe
iop_chan_start_null_memcpy
iop_chan_start_null_xor
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * offload engine driver for the Intel Xscale series of i/o processors
   4  * Copyright © 2006, Intel Corporation.
   5  */
   6 
   7 /*
   8  * This driver supports the asynchrounous DMA copy and RAID engines available
   9  * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
  10  */
  11 
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/delay.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/prefetch.h>
  20 #include <linux/memory.h>
  21 #include <linux/ioport.h>
  22 #include <linux/raid/pq.h>
  23 #include <linux/slab.h>
  24 
  25 #include "iop-adma.h"
  26 #include "dmaengine.h"
  27 
  28 #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
  29 #define to_iop_adma_device(dev) \
  30         container_of(dev, struct iop_adma_device, common)
  31 #define tx_to_iop_adma_slot(tx) \
  32         container_of(tx, struct iop_adma_desc_slot, async_tx)
  33 
  34 /**
  35  * iop_adma_free_slots - flags descriptor slots for reuse
  36  * @slot: Slot to free
  37  * Caller must hold &iop_chan->lock while calling this function
  38  */
  39 static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
  40 {
  41         int stride = slot->slots_per_op;
  42 
  43         while (stride--) {
  44                 slot->slots_per_op = 0;
  45                 slot = list_entry(slot->slot_node.next,
  46                                 struct iop_adma_desc_slot,
  47                                 slot_node);
  48         }
  49 }
  50 
  51 static dma_cookie_t
  52 iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
  53         struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
  54 {
  55         struct dma_async_tx_descriptor *tx = &desc->async_tx;
  56 
  57         BUG_ON(tx->cookie < 0);
  58         if (tx->cookie > 0) {
  59                 cookie = tx->cookie;
  60                 tx->cookie = 0;
  61 
  62                 /* call the callback (must not sleep or submit new
  63                  * operations to this channel)
  64                  */
  65                 dmaengine_desc_get_callback_invoke(tx, NULL);
  66 
  67                 dma_descriptor_unmap(tx);
  68                 if (desc->group_head)
  69                         desc->group_head = NULL;
  70         }
  71 
  72         /* run dependent operations */
  73         dma_run_dependencies(tx);
  74 
  75         return cookie;
  76 }
  77 
  78 static int
  79 iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
  80         struct iop_adma_chan *iop_chan)
  81 {
  82         /* the client is allowed to attach dependent operations
  83          * until 'ack' is set
  84          */
  85         if (!async_tx_test_ack(&desc->async_tx))
  86                 return 0;
  87 
  88         /* leave the last descriptor in the chain
  89          * so we can append to it
  90          */
  91         if (desc->chain_node.next == &iop_chan->chain)
  92                 return 1;
  93 
  94         dev_dbg(iop_chan->device->common.dev,
  95                 "\tfree slot: %d slots_per_op: %d\n",
  96                 desc->idx, desc->slots_per_op);
  97 
  98         list_del(&desc->chain_node);
  99         iop_adma_free_slots(desc);
 100 
 101         return 0;
 102 }
 103 
 104 static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
 105 {
 106         struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
 107         dma_cookie_t cookie = 0;
 108         u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
 109         int busy = iop_chan_is_busy(iop_chan);
 110         int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
 111 
 112         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
 113         /* free completed slots from the chain starting with
 114          * the oldest descriptor
 115          */
 116         list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
 117                                         chain_node) {
 118                 pr_debug("\tcookie: %d slot: %d busy: %d "
 119                         "this_desc: %pad next_desc: %#llx ack: %d\n",
 120                         iter->async_tx.cookie, iter->idx, busy,
 121                         &iter->async_tx.phys, (u64)iop_desc_get_next_desc(iter),
 122                         async_tx_test_ack(&iter->async_tx));
 123                 prefetch(_iter);
 124                 prefetch(&_iter->async_tx);
 125 
 126                 /* do not advance past the current descriptor loaded into the
 127                  * hardware channel, subsequent descriptors are either in
 128                  * process or have not been submitted
 129                  */
 130                 if (seen_current)
 131                         break;
 132 
 133                 /* stop the search if we reach the current descriptor and the
 134                  * channel is busy, or if it appears that the current descriptor
 135                  * needs to be re-read (i.e. has been appended to)
 136                  */
 137                 if (iter->async_tx.phys == current_desc) {
 138                         BUG_ON(seen_current++);
 139                         if (busy || iop_desc_get_next_desc(iter))
 140                                 break;
 141                 }
 142 
 143                 /* detect the start of a group transaction */
 144                 if (!slot_cnt && !slots_per_op) {
 145                         slot_cnt = iter->slot_cnt;
 146                         slots_per_op = iter->slots_per_op;
 147                         if (slot_cnt <= slots_per_op) {
 148                                 slot_cnt = 0;
 149                                 slots_per_op = 0;
 150                         }
 151                 }
 152 
 153                 if (slot_cnt) {
 154                         pr_debug("\tgroup++\n");
 155                         if (!grp_start)
 156                                 grp_start = iter;
 157                         slot_cnt -= slots_per_op;
 158                 }
 159 
 160                 /* all the members of a group are complete */
 161                 if (slots_per_op != 0 && slot_cnt == 0) {
 162                         struct iop_adma_desc_slot *grp_iter, *_grp_iter;
 163                         int end_of_chain = 0;
 164                         pr_debug("\tgroup end\n");
 165 
 166                         /* collect the total results */
 167                         if (grp_start->xor_check_result) {
 168                                 u32 zero_sum_result = 0;
 169                                 slot_cnt = grp_start->slot_cnt;
 170                                 grp_iter = grp_start;
 171 
 172                                 list_for_each_entry_from(grp_iter,
 173                                         &iop_chan->chain, chain_node) {
 174                                         zero_sum_result |=
 175                                             iop_desc_get_zero_result(grp_iter);
 176                                             pr_debug("\titer%d result: %d\n",
 177                                             grp_iter->idx, zero_sum_result);
 178                                         slot_cnt -= slots_per_op;
 179                                         if (slot_cnt == 0)
 180                                                 break;
 181                                 }
 182                                 pr_debug("\tgrp_start->xor_check_result: %p\n",
 183                                         grp_start->xor_check_result);
 184                                 *grp_start->xor_check_result = zero_sum_result;
 185                         }
 186 
 187                         /* clean up the group */
 188                         slot_cnt = grp_start->slot_cnt;
 189                         grp_iter = grp_start;
 190                         list_for_each_entry_safe_from(grp_iter, _grp_iter,
 191                                 &iop_chan->chain, chain_node) {
 192                                 cookie = iop_adma_run_tx_complete_actions(
 193                                         grp_iter, iop_chan, cookie);
 194 
 195                                 slot_cnt -= slots_per_op;
 196                                 end_of_chain = iop_adma_clean_slot(grp_iter,
 197                                         iop_chan);
 198 
 199                                 if (slot_cnt == 0 || end_of_chain)
 200                                         break;
 201                         }
 202 
 203                         /* the group should be complete at this point */
 204                         BUG_ON(slot_cnt);
 205 
 206                         slots_per_op = 0;
 207                         grp_start = NULL;
 208                         if (end_of_chain)
 209                                 break;
 210                         else
 211                                 continue;
 212                 } else if (slots_per_op) /* wait for group completion */
 213                         continue;
 214 
 215                 /* write back zero sum results (single descriptor case) */
 216                 if (iter->xor_check_result && iter->async_tx.cookie)
 217                         *iter->xor_check_result =
 218                                 iop_desc_get_zero_result(iter);
 219 
 220                 cookie = iop_adma_run_tx_complete_actions(
 221                                         iter, iop_chan, cookie);
 222 
 223                 if (iop_adma_clean_slot(iter, iop_chan))
 224                         break;
 225         }
 226 
 227         if (cookie > 0) {
 228                 iop_chan->common.completed_cookie = cookie;
 229                 pr_debug("\tcompleted cookie %d\n", cookie);
 230         }
 231 }
 232 
 233 static void
 234 iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
 235 {
 236         spin_lock_bh(&iop_chan->lock);
 237         __iop_adma_slot_cleanup(iop_chan);
 238         spin_unlock_bh(&iop_chan->lock);
 239 }
 240 
 241 static void iop_adma_tasklet(unsigned long data)
 242 {
 243         struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
 244 
 245         /* lockdep will flag depedency submissions as potentially
 246          * recursive locking, this is not the case as a dependency
 247          * submission will never recurse a channels submit routine.
 248          * There are checks in async_tx.c to prevent this.
 249          */
 250         spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING);
 251         __iop_adma_slot_cleanup(iop_chan);
 252         spin_unlock(&iop_chan->lock);
 253 }
 254 
 255 static struct iop_adma_desc_slot *
 256 iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
 257                         int slots_per_op)
 258 {
 259         struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
 260         LIST_HEAD(chain);
 261         int slots_found, retry = 0;
 262 
 263         /* start search from the last allocated descrtiptor
 264          * if a contiguous allocation can not be found start searching
 265          * from the beginning of the list
 266          */
 267 retry:
 268         slots_found = 0;
 269         if (retry == 0)
 270                 iter = iop_chan->last_used;
 271         else
 272                 iter = list_entry(&iop_chan->all_slots,
 273                         struct iop_adma_desc_slot,
 274                         slot_node);
 275 
 276         list_for_each_entry_safe_continue(
 277                 iter, _iter, &iop_chan->all_slots, slot_node) {
 278                 prefetch(_iter);
 279                 prefetch(&_iter->async_tx);
 280                 if (iter->slots_per_op) {
 281                         /* give up after finding the first busy slot
 282                          * on the second pass through the list
 283                          */
 284                         if (retry)
 285                                 break;
 286 
 287                         slots_found = 0;
 288                         continue;
 289                 }
 290 
 291                 /* start the allocation if the slot is correctly aligned */
 292                 if (!slots_found++) {
 293                         if (iop_desc_is_aligned(iter, slots_per_op))
 294                                 alloc_start = iter;
 295                         else {
 296                                 slots_found = 0;
 297                                 continue;
 298                         }
 299                 }
 300 
 301                 if (slots_found == num_slots) {
 302                         struct iop_adma_desc_slot *alloc_tail = NULL;
 303                         struct iop_adma_desc_slot *last_used = NULL;
 304                         iter = alloc_start;
 305                         while (num_slots) {
 306                                 int i;
 307                                 dev_dbg(iop_chan->device->common.dev,
 308                                         "allocated slot: %d "
 309                                         "(desc %p phys: %#llx) slots_per_op %d\n",
 310                                         iter->idx, iter->hw_desc,
 311                                         (u64)iter->async_tx.phys, slots_per_op);
 312 
 313                                 /* pre-ack all but the last descriptor */
 314                                 if (num_slots != slots_per_op)
 315                                         async_tx_ack(&iter->async_tx);
 316 
 317                                 list_add_tail(&iter->chain_node, &chain);
 318                                 alloc_tail = iter;
 319                                 iter->async_tx.cookie = 0;
 320                                 iter->slot_cnt = num_slots;
 321                                 iter->xor_check_result = NULL;
 322                                 for (i = 0; i < slots_per_op; i++) {
 323                                         iter->slots_per_op = slots_per_op - i;
 324                                         last_used = iter;
 325                                         iter = list_entry(iter->slot_node.next,
 326                                                 struct iop_adma_desc_slot,
 327                                                 slot_node);
 328                                 }
 329                                 num_slots -= slots_per_op;
 330                         }
 331                         alloc_tail->group_head = alloc_start;
 332                         alloc_tail->async_tx.cookie = -EBUSY;
 333                         list_splice(&chain, &alloc_tail->tx_list);
 334                         iop_chan->last_used = last_used;
 335                         iop_desc_clear_next_desc(alloc_start);
 336                         iop_desc_clear_next_desc(alloc_tail);
 337                         return alloc_tail;
 338                 }
 339         }
 340         if (!retry++)
 341                 goto retry;
 342 
 343         /* perform direct reclaim if the allocation fails */
 344         __iop_adma_slot_cleanup(iop_chan);
 345 
 346         return NULL;
 347 }
 348 
 349 static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
 350 {
 351         dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
 352                 iop_chan->pending);
 353 
 354         if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
 355                 iop_chan->pending = 0;
 356                 iop_chan_append(iop_chan);
 357         }
 358 }
 359 
 360 static dma_cookie_t
 361 iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
 362 {
 363         struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
 364         struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
 365         struct iop_adma_desc_slot *grp_start, *old_chain_tail;
 366         int slot_cnt;
 367         dma_cookie_t cookie;
 368         dma_addr_t next_dma;
 369 
 370         grp_start = sw_desc->group_head;
 371         slot_cnt = grp_start->slot_cnt;
 372 
 373         spin_lock_bh(&iop_chan->lock);
 374         cookie = dma_cookie_assign(tx);
 375 
 376         old_chain_tail = list_entry(iop_chan->chain.prev,
 377                 struct iop_adma_desc_slot, chain_node);
 378         list_splice_init(&sw_desc->tx_list,
 379                          &old_chain_tail->chain_node);
 380 
 381         /* fix up the hardware chain */
 382         next_dma = grp_start->async_tx.phys;
 383         iop_desc_set_next_desc(old_chain_tail, next_dma);
 384         BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
 385 
 386         /* check for pre-chained descriptors */
 387         iop_paranoia(iop_desc_get_next_desc(sw_desc));
 388 
 389         /* increment the pending count by the number of slots
 390          * memcpy operations have a 1:1 (slot:operation) relation
 391          * other operations are heavier and will pop the threshold
 392          * more often.
 393          */
 394         iop_chan->pending += slot_cnt;
 395         iop_adma_check_threshold(iop_chan);
 396         spin_unlock_bh(&iop_chan->lock);
 397 
 398         dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
 399                 __func__, sw_desc->async_tx.cookie, sw_desc->idx);
 400 
 401         return cookie;
 402 }
 403 
 404 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
 405 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
 406 
 407 /**
 408  * iop_adma_alloc_chan_resources -  returns the number of allocated descriptors
 409  * @chan - allocate descriptor resources for this channel
 410  * @client - current client requesting the channel be ready for requests
 411  *
 412  * Note: We keep the slots for 1 operation on iop_chan->chain at all times.  To
 413  * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
 414  * greater than 2x the number slots needed to satisfy a device->max_xor
 415  * request.
 416  * */
 417 static int iop_adma_alloc_chan_resources(struct dma_chan *chan)
 418 {
 419         char *hw_desc;
 420         int idx;
 421         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 422         struct iop_adma_desc_slot *slot = NULL;
 423         int init = iop_chan->slots_allocated ? 0 : 1;
 424         struct iop_adma_platform_data *plat_data =
 425                 dev_get_platdata(&iop_chan->device->pdev->dev);
 426         int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
 427 
 428         /* Allocate descriptor slots */
 429         do {
 430                 idx = iop_chan->slots_allocated;
 431                 if (idx == num_descs_in_pool)
 432                         break;
 433 
 434                 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 435                 if (!slot) {
 436                         printk(KERN_INFO "IOP ADMA Channel only initialized"
 437                                 " %d descriptor slots", idx);
 438                         break;
 439                 }
 440                 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
 441                 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
 442 
 443                 dma_async_tx_descriptor_init(&slot->async_tx, chan);
 444                 slot->async_tx.tx_submit = iop_adma_tx_submit;
 445                 INIT_LIST_HEAD(&slot->tx_list);
 446                 INIT_LIST_HEAD(&slot->chain_node);
 447                 INIT_LIST_HEAD(&slot->slot_node);
 448                 hw_desc = (char *) iop_chan->device->dma_desc_pool;
 449                 slot->async_tx.phys =
 450                         (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
 451                 slot->idx = idx;
 452 
 453                 spin_lock_bh(&iop_chan->lock);
 454                 iop_chan->slots_allocated++;
 455                 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
 456                 spin_unlock_bh(&iop_chan->lock);
 457         } while (iop_chan->slots_allocated < num_descs_in_pool);
 458 
 459         if (idx && !iop_chan->last_used)
 460                 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
 461                                         struct iop_adma_desc_slot,
 462                                         slot_node);
 463 
 464         dev_dbg(iop_chan->device->common.dev,
 465                 "allocated %d descriptor slots last_used: %p\n",
 466                 iop_chan->slots_allocated, iop_chan->last_used);
 467 
 468         /* initialize the channel and the chain with a null operation */
 469         if (init) {
 470                 if (dma_has_cap(DMA_MEMCPY,
 471                         iop_chan->device->common.cap_mask))
 472                         iop_chan_start_null_memcpy(iop_chan);
 473                 else if (dma_has_cap(DMA_XOR,
 474                         iop_chan->device->common.cap_mask))
 475                         iop_chan_start_null_xor(iop_chan);
 476                 else
 477                         BUG();
 478         }
 479 
 480         return (idx > 0) ? idx : -ENOMEM;
 481 }
 482 
 483 static struct dma_async_tx_descriptor *
 484 iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
 485 {
 486         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 487         struct iop_adma_desc_slot *sw_desc, *grp_start;
 488         int slot_cnt, slots_per_op;
 489 
 490         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
 491 
 492         spin_lock_bh(&iop_chan->lock);
 493         slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
 494         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 495         if (sw_desc) {
 496                 grp_start = sw_desc->group_head;
 497                 iop_desc_init_interrupt(grp_start, iop_chan);
 498                 sw_desc->async_tx.flags = flags;
 499         }
 500         spin_unlock_bh(&iop_chan->lock);
 501 
 502         return sw_desc ? &sw_desc->async_tx : NULL;
 503 }
 504 
 505 static struct dma_async_tx_descriptor *
 506 iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
 507                          dma_addr_t dma_src, size_t len, unsigned long flags)
 508 {
 509         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 510         struct iop_adma_desc_slot *sw_desc, *grp_start;
 511         int slot_cnt, slots_per_op;
 512 
 513         if (unlikely(!len))
 514                 return NULL;
 515         BUG_ON(len > IOP_ADMA_MAX_BYTE_COUNT);
 516 
 517         dev_dbg(iop_chan->device->common.dev, "%s len: %zu\n",
 518                 __func__, len);
 519 
 520         spin_lock_bh(&iop_chan->lock);
 521         slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
 522         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 523         if (sw_desc) {
 524                 grp_start = sw_desc->group_head;
 525                 iop_desc_init_memcpy(grp_start, flags);
 526                 iop_desc_set_byte_count(grp_start, iop_chan, len);
 527                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
 528                 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
 529                 sw_desc->async_tx.flags = flags;
 530         }
 531         spin_unlock_bh(&iop_chan->lock);
 532 
 533         return sw_desc ? &sw_desc->async_tx : NULL;
 534 }
 535 
 536 static struct dma_async_tx_descriptor *
 537 iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
 538                       dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
 539                       unsigned long flags)
 540 {
 541         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 542         struct iop_adma_desc_slot *sw_desc, *grp_start;
 543         int slot_cnt, slots_per_op;
 544 
 545         if (unlikely(!len))
 546                 return NULL;
 547         BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
 548 
 549         dev_dbg(iop_chan->device->common.dev,
 550                 "%s src_cnt: %d len: %zu flags: %lx\n",
 551                 __func__, src_cnt, len, flags);
 552 
 553         spin_lock_bh(&iop_chan->lock);
 554         slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
 555         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 556         if (sw_desc) {
 557                 grp_start = sw_desc->group_head;
 558                 iop_desc_init_xor(grp_start, src_cnt, flags);
 559                 iop_desc_set_byte_count(grp_start, iop_chan, len);
 560                 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
 561                 sw_desc->async_tx.flags = flags;
 562                 while (src_cnt--)
 563                         iop_desc_set_xor_src_addr(grp_start, src_cnt,
 564                                                   dma_src[src_cnt]);
 565         }
 566         spin_unlock_bh(&iop_chan->lock);
 567 
 568         return sw_desc ? &sw_desc->async_tx : NULL;
 569 }
 570 
 571 static struct dma_async_tx_descriptor *
 572 iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src,
 573                           unsigned int src_cnt, size_t len, u32 *result,
 574                           unsigned long flags)
 575 {
 576         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 577         struct iop_adma_desc_slot *sw_desc, *grp_start;
 578         int slot_cnt, slots_per_op;
 579 
 580         if (unlikely(!len))
 581                 return NULL;
 582 
 583         dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %zu\n",
 584                 __func__, src_cnt, len);
 585 
 586         spin_lock_bh(&iop_chan->lock);
 587         slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
 588         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 589         if (sw_desc) {
 590                 grp_start = sw_desc->group_head;
 591                 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
 592                 iop_desc_set_zero_sum_byte_count(grp_start, len);
 593                 grp_start->xor_check_result = result;
 594                 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
 595                         __func__, grp_start->xor_check_result);
 596                 sw_desc->async_tx.flags = flags;
 597                 while (src_cnt--)
 598                         iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
 599                                                        dma_src[src_cnt]);
 600         }
 601         spin_unlock_bh(&iop_chan->lock);
 602 
 603         return sw_desc ? &sw_desc->async_tx : NULL;
 604 }
 605 
 606 static struct dma_async_tx_descriptor *
 607 iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
 608                      unsigned int src_cnt, const unsigned char *scf, size_t len,
 609                      unsigned long flags)
 610 {
 611         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 612         struct iop_adma_desc_slot *sw_desc, *g;
 613         int slot_cnt, slots_per_op;
 614         int continue_srcs;
 615 
 616         if (unlikely(!len))
 617                 return NULL;
 618         BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
 619 
 620         dev_dbg(iop_chan->device->common.dev,
 621                 "%s src_cnt: %d len: %zu flags: %lx\n",
 622                 __func__, src_cnt, len, flags);
 623 
 624         if (dmaf_p_disabled_continue(flags))
 625                 continue_srcs = 1+src_cnt;
 626         else if (dmaf_continue(flags))
 627                 continue_srcs = 3+src_cnt;
 628         else
 629                 continue_srcs = 0+src_cnt;
 630 
 631         spin_lock_bh(&iop_chan->lock);
 632         slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op);
 633         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 634         if (sw_desc) {
 635                 int i;
 636 
 637                 g = sw_desc->group_head;
 638                 iop_desc_set_byte_count(g, iop_chan, len);
 639 
 640                 /* even if P is disabled its destination address (bits
 641                  * [3:0]) must match Q.  It is ok if P points to an
 642                  * invalid address, it won't be written.
 643                  */
 644                 if (flags & DMA_PREP_PQ_DISABLE_P)
 645                         dst[0] = dst[1] & 0x7;
 646 
 647                 iop_desc_set_pq_addr(g, dst);
 648                 sw_desc->async_tx.flags = flags;
 649                 for (i = 0; i < src_cnt; i++)
 650                         iop_desc_set_pq_src_addr(g, i, src[i], scf[i]);
 651 
 652                 /* if we are continuing a previous operation factor in
 653                  * the old p and q values, see the comment for dma_maxpq
 654                  * in include/linux/dmaengine.h
 655                  */
 656                 if (dmaf_p_disabled_continue(flags))
 657                         iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
 658                 else if (dmaf_continue(flags)) {
 659                         iop_desc_set_pq_src_addr(g, i++, dst[0], 0);
 660                         iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
 661                         iop_desc_set_pq_src_addr(g, i++, dst[1], 0);
 662                 }
 663                 iop_desc_init_pq(g, i, flags);
 664         }
 665         spin_unlock_bh(&iop_chan->lock);
 666 
 667         return sw_desc ? &sw_desc->async_tx : NULL;
 668 }
 669 
 670 static struct dma_async_tx_descriptor *
 671 iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
 672                          unsigned int src_cnt, const unsigned char *scf,
 673                          size_t len, enum sum_check_flags *pqres,
 674                          unsigned long flags)
 675 {
 676         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 677         struct iop_adma_desc_slot *sw_desc, *g;
 678         int slot_cnt, slots_per_op;
 679 
 680         if (unlikely(!len))
 681                 return NULL;
 682         BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
 683 
 684         dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %zu\n",
 685                 __func__, src_cnt, len);
 686 
 687         spin_lock_bh(&iop_chan->lock);
 688         slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op);
 689         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
 690         if (sw_desc) {
 691                 /* for validate operations p and q are tagged onto the
 692                  * end of the source list
 693                  */
 694                 int pq_idx = src_cnt;
 695 
 696                 g = sw_desc->group_head;
 697                 iop_desc_init_pq_zero_sum(g, src_cnt+2, flags);
 698                 iop_desc_set_pq_zero_sum_byte_count(g, len);
 699                 g->pq_check_result = pqres;
 700                 pr_debug("\t%s: g->pq_check_result: %p\n",
 701                         __func__, g->pq_check_result);
 702                 sw_desc->async_tx.flags = flags;
 703                 while (src_cnt--)
 704                         iop_desc_set_pq_zero_sum_src_addr(g, src_cnt,
 705                                                           src[src_cnt],
 706                                                           scf[src_cnt]);
 707                 iop_desc_set_pq_zero_sum_addr(g, pq_idx, src);
 708         }
 709         spin_unlock_bh(&iop_chan->lock);
 710 
 711         return sw_desc ? &sw_desc->async_tx : NULL;
 712 }
 713 
 714 static void iop_adma_free_chan_resources(struct dma_chan *chan)
 715 {
 716         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 717         struct iop_adma_desc_slot *iter, *_iter;
 718         int in_use_descs = 0;
 719 
 720         iop_adma_slot_cleanup(iop_chan);
 721 
 722         spin_lock_bh(&iop_chan->lock);
 723         list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
 724                                         chain_node) {
 725                 in_use_descs++;
 726                 list_del(&iter->chain_node);
 727         }
 728         list_for_each_entry_safe_reverse(
 729                 iter, _iter, &iop_chan->all_slots, slot_node) {
 730                 list_del(&iter->slot_node);
 731                 kfree(iter);
 732                 iop_chan->slots_allocated--;
 733         }
 734         iop_chan->last_used = NULL;
 735 
 736         dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
 737                 __func__, iop_chan->slots_allocated);
 738         spin_unlock_bh(&iop_chan->lock);
 739 
 740         /* one is ok since we left it on there on purpose */
 741         if (in_use_descs > 1)
 742                 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
 743                         in_use_descs - 1);
 744 }
 745 
 746 /**
 747  * iop_adma_status - poll the status of an ADMA transaction
 748  * @chan: ADMA channel handle
 749  * @cookie: ADMA transaction identifier
 750  * @txstate: a holder for the current state of the channel or NULL
 751  */
 752 static enum dma_status iop_adma_status(struct dma_chan *chan,
 753                                         dma_cookie_t cookie,
 754                                         struct dma_tx_state *txstate)
 755 {
 756         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 757         int ret;
 758 
 759         ret = dma_cookie_status(chan, cookie, txstate);
 760         if (ret == DMA_COMPLETE)
 761                 return ret;
 762 
 763         iop_adma_slot_cleanup(iop_chan);
 764 
 765         return dma_cookie_status(chan, cookie, txstate);
 766 }
 767 
 768 static irqreturn_t iop_adma_eot_handler(int irq, void *data)
 769 {
 770         struct iop_adma_chan *chan = data;
 771 
 772         dev_dbg(chan->device->common.dev, "%s\n", __func__);
 773 
 774         tasklet_schedule(&chan->irq_tasklet);
 775 
 776         iop_adma_device_clear_eot_status(chan);
 777 
 778         return IRQ_HANDLED;
 779 }
 780 
 781 static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
 782 {
 783         struct iop_adma_chan *chan = data;
 784 
 785         dev_dbg(chan->device->common.dev, "%s\n", __func__);
 786 
 787         tasklet_schedule(&chan->irq_tasklet);
 788 
 789         iop_adma_device_clear_eoc_status(chan);
 790 
 791         return IRQ_HANDLED;
 792 }
 793 
 794 static irqreturn_t iop_adma_err_handler(int irq, void *data)
 795 {
 796         struct iop_adma_chan *chan = data;
 797         unsigned long status = iop_chan_get_status(chan);
 798 
 799         dev_err(chan->device->common.dev,
 800                 "error ( %s%s%s%s%s%s%s)\n",
 801                 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
 802                 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
 803                 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
 804                 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
 805                 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
 806                 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
 807                 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
 808 
 809         iop_adma_device_clear_err_status(chan);
 810 
 811         BUG();
 812 
 813         return IRQ_HANDLED;
 814 }
 815 
 816 static void iop_adma_issue_pending(struct dma_chan *chan)
 817 {
 818         struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
 819 
 820         if (iop_chan->pending) {
 821                 iop_chan->pending = 0;
 822                 iop_chan_append(iop_chan);
 823         }
 824 }
 825 
 826 /*
 827  * Perform a transaction to verify the HW works.
 828  */
 829 #define IOP_ADMA_TEST_SIZE 2000
 830 
 831 static int iop_adma_memcpy_self_test(struct iop_adma_device *device)
 832 {
 833         int i;
 834         void *src, *dest;
 835         dma_addr_t src_dma, dest_dma;
 836         struct dma_chan *dma_chan;
 837         dma_cookie_t cookie;
 838         struct dma_async_tx_descriptor *tx;
 839         int err = 0;
 840         struct iop_adma_chan *iop_chan;
 841 
 842         dev_dbg(device->common.dev, "%s\n", __func__);
 843 
 844         src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
 845         if (!src)
 846                 return -ENOMEM;
 847         dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
 848         if (!dest) {
 849                 kfree(src);
 850                 return -ENOMEM;
 851         }
 852 
 853         /* Fill in src buffer */
 854         for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
 855                 ((u8 *) src)[i] = (u8)i;
 856 
 857         /* Start copy, using first DMA channel */
 858         dma_chan = container_of(device->common.channels.next,
 859                                 struct dma_chan,
 860                                 device_node);
 861         if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
 862                 err = -ENODEV;
 863                 goto out;
 864         }
 865 
 866         dest_dma = dma_map_single(dma_chan->device->dev, dest,
 867                                 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
 868         src_dma = dma_map_single(dma_chan->device->dev, src,
 869                                 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
 870         tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
 871                                       IOP_ADMA_TEST_SIZE,
 872                                       DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 873 
 874         cookie = iop_adma_tx_submit(tx);
 875         iop_adma_issue_pending(dma_chan);
 876         msleep(1);
 877 
 878         if (iop_adma_status(dma_chan, cookie, NULL) !=
 879                         DMA_COMPLETE) {
 880                 dev_err(dma_chan->device->dev,
 881                         "Self-test copy timed out, disabling\n");
 882                 err = -ENODEV;
 883                 goto free_resources;
 884         }
 885 
 886         iop_chan = to_iop_adma_chan(dma_chan);
 887         dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
 888                 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
 889         if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
 890                 dev_err(dma_chan->device->dev,
 891                         "Self-test copy failed compare, disabling\n");
 892                 err = -ENODEV;
 893                 goto free_resources;
 894         }
 895 
 896 free_resources:
 897         iop_adma_free_chan_resources(dma_chan);
 898 out:
 899         kfree(src);
 900         kfree(dest);
 901         return err;
 902 }
 903 
 904 #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
 905 static int
 906 iop_adma_xor_val_self_test(struct iop_adma_device *device)
 907 {
 908         int i, src_idx;
 909         struct page *dest;
 910         struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
 911         struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
 912         dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
 913         dma_addr_t dest_dma;
 914         struct dma_async_tx_descriptor *tx;
 915         struct dma_chan *dma_chan;
 916         dma_cookie_t cookie;
 917         u8 cmp_byte = 0;
 918         u32 cmp_word;
 919         u32 zero_sum_result;
 920         int err = 0;
 921         struct iop_adma_chan *iop_chan;
 922 
 923         dev_dbg(device->common.dev, "%s\n", __func__);
 924 
 925         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
 926                 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
 927                 if (!xor_srcs[src_idx]) {
 928                         while (src_idx--)
 929                                 __free_page(xor_srcs[src_idx]);
 930                         return -ENOMEM;
 931                 }
 932         }
 933 
 934         dest = alloc_page(GFP_KERNEL);
 935         if (!dest) {
 936                 while (src_idx--)
 937                         __free_page(xor_srcs[src_idx]);
 938                 return -ENOMEM;
 939         }
 940 
 941         /* Fill in src buffers */
 942         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
 943                 u8 *ptr = page_address(xor_srcs[src_idx]);
 944                 for (i = 0; i < PAGE_SIZE; i++)
 945                         ptr[i] = (1 << src_idx);
 946         }
 947 
 948         for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
 949                 cmp_byte ^= (u8) (1 << src_idx);
 950 
 951         cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
 952                         (cmp_byte << 8) | cmp_byte;
 953 
 954         memset(page_address(dest), 0, PAGE_SIZE);
 955 
 956         dma_chan = container_of(device->common.channels.next,
 957                                 struct dma_chan,
 958                                 device_node);
 959         if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
 960                 err = -ENODEV;
 961                 goto out;
 962         }
 963 
 964         /* test xor */
 965         dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
 966                                 PAGE_SIZE, DMA_FROM_DEVICE);
 967         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
 968                 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
 969                                            0, PAGE_SIZE, DMA_TO_DEVICE);
 970         tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
 971                                    IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
 972                                    DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 973 
 974         cookie = iop_adma_tx_submit(tx);
 975         iop_adma_issue_pending(dma_chan);
 976         msleep(8);
 977 
 978         if (iop_adma_status(dma_chan, cookie, NULL) !=
 979                 DMA_COMPLETE) {
 980                 dev_err(dma_chan->device->dev,
 981                         "Self-test xor timed out, disabling\n");
 982                 err = -ENODEV;
 983                 goto free_resources;
 984         }
 985 
 986         iop_chan = to_iop_adma_chan(dma_chan);
 987         dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
 988                 PAGE_SIZE, DMA_FROM_DEVICE);
 989         for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
 990                 u32 *ptr = page_address(dest);
 991                 if (ptr[i] != cmp_word) {
 992                         dev_err(dma_chan->device->dev,
 993                                 "Self-test xor failed compare, disabling\n");
 994                         err = -ENODEV;
 995                         goto free_resources;
 996                 }
 997         }
 998         dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
 999                 PAGE_SIZE, DMA_TO_DEVICE);
1000 
1001         /* skip zero sum if the capability is not present */
1002         if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
1003                 goto free_resources;
1004 
1005         /* zero sum the sources with the destintation page */
1006         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1007                 zero_sum_srcs[i] = xor_srcs[i];
1008         zero_sum_srcs[i] = dest;
1009 
1010         zero_sum_result = 1;
1011 
1012         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1013                 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1014                                            zero_sum_srcs[i], 0, PAGE_SIZE,
1015                                            DMA_TO_DEVICE);
1016         tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1017                                        IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1018                                        &zero_sum_result,
1019                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1020 
1021         cookie = iop_adma_tx_submit(tx);
1022         iop_adma_issue_pending(dma_chan);
1023         msleep(8);
1024 
1025         if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1026                 dev_err(dma_chan->device->dev,
1027                         "Self-test zero sum timed out, disabling\n");
1028                 err = -ENODEV;
1029                 goto free_resources;
1030         }
1031 
1032         if (zero_sum_result != 0) {
1033                 dev_err(dma_chan->device->dev,
1034                         "Self-test zero sum failed compare, disabling\n");
1035                 err = -ENODEV;
1036                 goto free_resources;
1037         }
1038 
1039         /* test for non-zero parity sum */
1040         zero_sum_result = 0;
1041         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1042                 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1043                                            zero_sum_srcs[i], 0, PAGE_SIZE,
1044                                            DMA_TO_DEVICE);
1045         tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1046                                        IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1047                                        &zero_sum_result,
1048                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1049 
1050         cookie = iop_adma_tx_submit(tx);
1051         iop_adma_issue_pending(dma_chan);
1052         msleep(8);
1053 
1054         if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1055                 dev_err(dma_chan->device->dev,
1056                         "Self-test non-zero sum timed out, disabling\n");
1057                 err = -ENODEV;
1058                 goto free_resources;
1059         }
1060 
1061         if (zero_sum_result != 1) {
1062                 dev_err(dma_chan->device->dev,
1063                         "Self-test non-zero sum failed compare, disabling\n");
1064                 err = -ENODEV;
1065                 goto free_resources;
1066         }
1067 
1068 free_resources:
1069         iop_adma_free_chan_resources(dma_chan);
1070 out:
1071         src_idx = IOP_ADMA_NUM_SRC_TEST;
1072         while (src_idx--)
1073                 __free_page(xor_srcs[src_idx]);
1074         __free_page(dest);
1075         return err;
1076 }
1077 
1078 #ifdef CONFIG_RAID6_PQ
1079 static int
1080 iop_adma_pq_zero_sum_self_test(struct iop_adma_device *device)
1081 {
1082         /* combined sources, software pq results, and extra hw pq results */
1083         struct page *pq[IOP_ADMA_NUM_SRC_TEST+2+2];
1084         /* ptr to the extra hw pq buffers defined above */
1085         struct page **pq_hw = &pq[IOP_ADMA_NUM_SRC_TEST+2];
1086         /* address conversion buffers (dma_map / page_address) */
1087         void *pq_sw[IOP_ADMA_NUM_SRC_TEST+2];
1088         dma_addr_t pq_src[IOP_ADMA_NUM_SRC_TEST+2];
1089         dma_addr_t *pq_dest = &pq_src[IOP_ADMA_NUM_SRC_TEST];
1090 
1091         int i;
1092         struct dma_async_tx_descriptor *tx;
1093         struct dma_chan *dma_chan;
1094         dma_cookie_t cookie;
1095         u32 zero_sum_result;
1096         int err = 0;
1097         struct device *dev;
1098 
1099         dev_dbg(device->common.dev, "%s\n", __func__);
1100 
1101         for (i = 0; i < ARRAY_SIZE(pq); i++) {
1102                 pq[i] = alloc_page(GFP_KERNEL);
1103                 if (!pq[i]) {
1104                         while (i--)
1105                                 __free_page(pq[i]);
1106                         return -ENOMEM;
1107                 }
1108         }
1109 
1110         /* Fill in src buffers */
1111         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) {
1112                 pq_sw[i] = page_address(pq[i]);
1113                 memset(pq_sw[i], 0x11111111 * (1<<i), PAGE_SIZE);
1114         }
1115         pq_sw[i] = page_address(pq[i]);
1116         pq_sw[i+1] = page_address(pq[i+1]);
1117 
1118         dma_chan = container_of(device->common.channels.next,
1119                                 struct dma_chan,
1120                                 device_node);
1121         if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
1122                 err = -ENODEV;
1123                 goto out;
1124         }
1125 
1126         dev = dma_chan->device->dev;
1127 
1128         /* initialize the dests */
1129         memset(page_address(pq_hw[0]), 0 , PAGE_SIZE);
1130         memset(page_address(pq_hw[1]), 0 , PAGE_SIZE);
1131 
1132         /* test pq */
1133         pq_dest[0] = dma_map_page(dev, pq_hw[0], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1134         pq_dest[1] = dma_map_page(dev, pq_hw[1], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1135         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1136                 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1137                                          DMA_TO_DEVICE);
1138 
1139         tx = iop_adma_prep_dma_pq(dma_chan, pq_dest, pq_src,
1140                                   IOP_ADMA_NUM_SRC_TEST, (u8 *)raid6_gfexp,
1141                                   PAGE_SIZE,
1142                                   DMA_PREP_INTERRUPT |
1143                                   DMA_CTRL_ACK);
1144 
1145         cookie = iop_adma_tx_submit(tx);
1146         iop_adma_issue_pending(dma_chan);
1147         msleep(8);
1148 
1149         if (iop_adma_status(dma_chan, cookie, NULL) !=
1150                 DMA_COMPLETE) {
1151                 dev_err(dev, "Self-test pq timed out, disabling\n");
1152                 err = -ENODEV;
1153                 goto free_resources;
1154         }
1155 
1156         raid6_call.gen_syndrome(IOP_ADMA_NUM_SRC_TEST+2, PAGE_SIZE, pq_sw);
1157 
1158         if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST],
1159                    page_address(pq_hw[0]), PAGE_SIZE) != 0) {
1160                 dev_err(dev, "Self-test p failed compare, disabling\n");
1161                 err = -ENODEV;
1162                 goto free_resources;
1163         }
1164         if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST+1],
1165                    page_address(pq_hw[1]), PAGE_SIZE) != 0) {
1166                 dev_err(dev, "Self-test q failed compare, disabling\n");
1167                 err = -ENODEV;
1168                 goto free_resources;
1169         }
1170 
1171         /* test correct zero sum using the software generated pq values */
1172         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1173                 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1174                                          DMA_TO_DEVICE);
1175 
1176         zero_sum_result = ~0;
1177         tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1178                                       pq_src, IOP_ADMA_NUM_SRC_TEST,
1179                                       raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1180                                       DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1181 
1182         cookie = iop_adma_tx_submit(tx);
1183         iop_adma_issue_pending(dma_chan);
1184         msleep(8);
1185 
1186         if (iop_adma_status(dma_chan, cookie, NULL) !=
1187                 DMA_COMPLETE) {
1188                 dev_err(dev, "Self-test pq-zero-sum timed out, disabling\n");
1189                 err = -ENODEV;
1190                 goto free_resources;
1191         }
1192 
1193         if (zero_sum_result != 0) {
1194                 dev_err(dev, "Self-test pq-zero-sum failed to validate: %x\n",
1195                         zero_sum_result);
1196                 err = -ENODEV;
1197                 goto free_resources;
1198         }
1199 
1200         /* test incorrect zero sum */
1201         i = IOP_ADMA_NUM_SRC_TEST;
1202         memset(pq_sw[i] + 100, 0, 100);
1203         memset(pq_sw[i+1] + 200, 0, 200);
1204         for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1205                 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1206                                          DMA_TO_DEVICE);
1207 
1208         zero_sum_result = 0;
1209         tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1210                                       pq_src, IOP_ADMA_NUM_SRC_TEST,
1211                                       raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1212                                       DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1213 
1214         cookie = iop_adma_tx_submit(tx);
1215         iop_adma_issue_pending(dma_chan);
1216         msleep(8);
1217 
1218         if (iop_adma_status(dma_chan, cookie, NULL) !=
1219                 DMA_COMPLETE) {
1220                 dev_err(dev, "Self-test !pq-zero-sum timed out, disabling\n");
1221                 err = -ENODEV;
1222                 goto free_resources;
1223         }
1224 
1225         if (zero_sum_result != (SUM_CHECK_P_RESULT | SUM_CHECK_Q_RESULT)) {
1226                 dev_err(dev, "Self-test !pq-zero-sum failed to validate: %x\n",
1227                         zero_sum_result);
1228                 err = -ENODEV;
1229                 goto free_resources;
1230         }
1231 
1232 free_resources:
1233         iop_adma_free_chan_resources(dma_chan);
1234 out:
1235         i = ARRAY_SIZE(pq);
1236         while (i--)
1237                 __free_page(pq[i]);
1238         return err;
1239 }
1240 #endif
1241 
1242 static int iop_adma_remove(struct platform_device *dev)
1243 {
1244         struct iop_adma_device *device = platform_get_drvdata(dev);
1245         struct dma_chan *chan, *_chan;
1246         struct iop_adma_chan *iop_chan;
1247         struct iop_adma_platform_data *plat_data = dev_get_platdata(&dev->dev);
1248 
1249         dma_async_device_unregister(&device->common);
1250 
1251         dma_free_coherent(&dev->dev, plat_data->pool_size,
1252                         device->dma_desc_pool_virt, device->dma_desc_pool);
1253 
1254         list_for_each_entry_safe(chan, _chan, &device->common.channels,
1255                                 device_node) {
1256                 iop_chan = to_iop_adma_chan(chan);
1257                 list_del(&chan->device_node);
1258                 kfree(iop_chan);
1259         }
1260         kfree(device);
1261 
1262         return 0;
1263 }
1264 
1265 static int iop_adma_probe(struct platform_device *pdev)
1266 {
1267         struct resource *res;
1268         int ret = 0, i;
1269         struct iop_adma_device *adev;
1270         struct iop_adma_chan *iop_chan;
1271         struct dma_device *dma_dev;
1272         struct iop_adma_platform_data *plat_data = dev_get_platdata(&pdev->dev);
1273 
1274         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1275         if (!res)
1276                 return -ENODEV;
1277 
1278         if (!devm_request_mem_region(&pdev->dev, res->start,
1279                                 resource_size(res), pdev->name))
1280                 return -EBUSY;
1281 
1282         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1283         if (!adev)
1284                 return -ENOMEM;
1285         dma_dev = &adev->common;
1286 
1287         /* allocate coherent memory for hardware descriptors
1288          * note: writecombine gives slightly better performance, but
1289          * requires that we explicitly flush the writes
1290          */
1291         adev->dma_desc_pool_virt = dma_alloc_wc(&pdev->dev,
1292                                                 plat_data->pool_size,
1293                                                 &adev->dma_desc_pool,
1294                                                 GFP_KERNEL);
1295         if (!adev->dma_desc_pool_virt) {
1296                 ret = -ENOMEM;
1297                 goto err_free_adev;
1298         }
1299 
1300         dev_dbg(&pdev->dev, "%s: allocated descriptor pool virt %p phys %p\n",
1301                 __func__, adev->dma_desc_pool_virt,
1302                 (void *) adev->dma_desc_pool);
1303 
1304         adev->id = plat_data->hw_id;
1305 
1306         /* discover transaction capabilites from the platform data */
1307         dma_dev->cap_mask = plat_data->cap_mask;
1308 
1309         adev->pdev = pdev;
1310         platform_set_drvdata(pdev, adev);
1311 
1312         INIT_LIST_HEAD(&dma_dev->channels);
1313 
1314         /* set base routines */
1315         dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1316         dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
1317         dma_dev->device_tx_status = iop_adma_status;
1318         dma_dev->device_issue_pending = iop_adma_issue_pending;
1319         dma_dev->dev = &pdev->dev;
1320 
1321         /* set prep routines based on capability */
1322         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1323                 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
1324         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1325                 dma_dev->max_xor = iop_adma_get_max_xor();
1326                 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1327         }
1328         if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask))
1329                 dma_dev->device_prep_dma_xor_val =
1330                         iop_adma_prep_dma_xor_val;
1331         if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1332                 dma_set_maxpq(dma_dev, iop_adma_get_max_pq(), 0);
1333                 dma_dev->device_prep_dma_pq = iop_adma_prep_dma_pq;
1334         }
1335         if (dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask))
1336                 dma_dev->device_prep_dma_pq_val =
1337                         iop_adma_prep_dma_pq_val;
1338         if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1339                 dma_dev->device_prep_dma_interrupt =
1340                         iop_adma_prep_dma_interrupt;
1341 
1342         iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1343         if (!iop_chan) {
1344                 ret = -ENOMEM;
1345                 goto err_free_dma;
1346         }
1347         iop_chan->device = adev;
1348 
1349         iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
1350                                         resource_size(res));
1351         if (!iop_chan->mmr_base) {
1352                 ret = -ENOMEM;
1353                 goto err_free_iop_chan;
1354         }
1355         tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1356                 iop_chan);
1357 
1358         /* clear errors before enabling interrupts */
1359         iop_adma_device_clear_err_status(iop_chan);
1360 
1361         for (i = 0; i < 3; i++) {
1362                 irq_handler_t handler[] = { iop_adma_eot_handler,
1363                                         iop_adma_eoc_handler,
1364                                         iop_adma_err_handler };
1365                 int irq = platform_get_irq(pdev, i);
1366                 if (irq < 0) {
1367                         ret = -ENXIO;
1368                         goto err_free_iop_chan;
1369                 } else {
1370                         ret = devm_request_irq(&pdev->dev, irq,
1371                                         handler[i], 0, pdev->name, iop_chan);
1372                         if (ret)
1373                                 goto err_free_iop_chan;
1374                 }
1375         }
1376 
1377         spin_lock_init(&iop_chan->lock);
1378         INIT_LIST_HEAD(&iop_chan->chain);
1379         INIT_LIST_HEAD(&iop_chan->all_slots);
1380         iop_chan->common.device = dma_dev;
1381         dma_cookie_init(&iop_chan->common);
1382         list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1383 
1384         if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1385                 ret = iop_adma_memcpy_self_test(adev);
1386                 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1387                 if (ret)
1388                         goto err_free_iop_chan;
1389         }
1390 
1391         if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1392                 ret = iop_adma_xor_val_self_test(adev);
1393                 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1394                 if (ret)
1395                         goto err_free_iop_chan;
1396         }
1397 
1398         if (dma_has_cap(DMA_PQ, dma_dev->cap_mask) &&
1399             dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) {
1400                 #ifdef CONFIG_RAID6_PQ
1401                 ret = iop_adma_pq_zero_sum_self_test(adev);
1402                 dev_dbg(&pdev->dev, "pq self test returned %d\n", ret);
1403                 #else
1404                 /* can not test raid6, so do not publish capability */
1405                 dma_cap_clear(DMA_PQ, dma_dev->cap_mask);
1406                 dma_cap_clear(DMA_PQ_VAL, dma_dev->cap_mask);
1407                 ret = 0;
1408                 #endif
1409                 if (ret)
1410                         goto err_free_iop_chan;
1411         }
1412 
1413         dev_info(&pdev->dev, "Intel(R) IOP: ( %s%s%s%s%s%s)\n",
1414                  dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "",
1415                  dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "",
1416                  dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1417                  dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "",
1418                  dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1419                  dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1420 
1421         dma_async_device_register(dma_dev);
1422         goto out;
1423 
1424  err_free_iop_chan:
1425         kfree(iop_chan);
1426  err_free_dma:
1427         dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1428                         adev->dma_desc_pool_virt, adev->dma_desc_pool);
1429  err_free_adev:
1430         kfree(adev);
1431  out:
1432         return ret;
1433 }
1434 
1435 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1436 {
1437         struct iop_adma_desc_slot *sw_desc, *grp_start;
1438         dma_cookie_t cookie;
1439         int slot_cnt, slots_per_op;
1440 
1441         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1442 
1443         spin_lock_bh(&iop_chan->lock);
1444         slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1445         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1446         if (sw_desc) {
1447                 grp_start = sw_desc->group_head;
1448 
1449                 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1450                 async_tx_ack(&sw_desc->async_tx);
1451                 iop_desc_init_memcpy(grp_start, 0);
1452                 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1453                 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1454                 iop_desc_set_memcpy_src_addr(grp_start, 0);
1455 
1456                 cookie = dma_cookie_assign(&sw_desc->async_tx);
1457 
1458                 /* initialize the completed cookie to be less than
1459                  * the most recently used cookie
1460                  */
1461                 iop_chan->common.completed_cookie = cookie - 1;
1462 
1463                 /* channel should not be busy */
1464                 BUG_ON(iop_chan_is_busy(iop_chan));
1465 
1466                 /* clear any prior error-status bits */
1467                 iop_adma_device_clear_err_status(iop_chan);
1468 
1469                 /* disable operation */
1470                 iop_chan_disable(iop_chan);
1471 
1472                 /* set the descriptor address */
1473                 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1474 
1475                 /* 1/ don't add pre-chained descriptors
1476                  * 2/ dummy read to flush next_desc write
1477                  */
1478                 BUG_ON(iop_desc_get_next_desc(sw_desc));
1479 
1480                 /* run the descriptor */
1481                 iop_chan_enable(iop_chan);
1482         } else
1483                 dev_err(iop_chan->device->common.dev,
1484                         "failed to allocate null descriptor\n");
1485         spin_unlock_bh(&iop_chan->lock);
1486 }
1487 
1488 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1489 {
1490         struct iop_adma_desc_slot *sw_desc, *grp_start;
1491         dma_cookie_t cookie;
1492         int slot_cnt, slots_per_op;
1493 
1494         dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1495 
1496         spin_lock_bh(&iop_chan->lock);
1497         slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1498         sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1499         if (sw_desc) {
1500                 grp_start = sw_desc->group_head;
1501                 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1502                 async_tx_ack(&sw_desc->async_tx);
1503                 iop_desc_init_null_xor(grp_start, 2, 0);
1504                 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1505                 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1506                 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1507                 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1508 
1509                 cookie = dma_cookie_assign(&sw_desc->async_tx);
1510 
1511                 /* initialize the completed cookie to be less than
1512                  * the most recently used cookie
1513                  */
1514                 iop_chan->common.completed_cookie = cookie - 1;
1515 
1516                 /* channel should not be busy */
1517                 BUG_ON(iop_chan_is_busy(iop_chan));
1518 
1519                 /* clear any prior error-status bits */
1520                 iop_adma_device_clear_err_status(iop_chan);
1521 
1522                 /* disable operation */
1523                 iop_chan_disable(iop_chan);
1524 
1525                 /* set the descriptor address */
1526                 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1527 
1528                 /* 1/ don't add pre-chained descriptors
1529                  * 2/ dummy read to flush next_desc write
1530                  */
1531                 BUG_ON(iop_desc_get_next_desc(sw_desc));
1532 
1533                 /* run the descriptor */
1534                 iop_chan_enable(iop_chan);
1535         } else
1536                 dev_err(iop_chan->device->common.dev,
1537                         "failed to allocate null descriptor\n");
1538         spin_unlock_bh(&iop_chan->lock);
1539 }
1540 
1541 static struct platform_driver iop_adma_driver = {
1542         .probe          = iop_adma_probe,
1543         .remove         = iop_adma_remove,
1544         .driver         = {
1545                 .name   = "iop-adma",
1546         },
1547 };
1548 
1549 module_platform_driver(iop_adma_driver);
1550 
1551 MODULE_AUTHOR("Intel Corporation");
1552 MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1553 MODULE_LICENSE("GPL");
1554 MODULE_ALIAS("platform:iop-adma");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/dma/iop-adma.c

DEFINITIONS
