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tcp: fix lockdep splat in tcp_snd_una_update()
[linux/fpc-iii.git] / drivers / dma / iop-adma.c
blobf039cfadf17b307c32bd88ef0e4a4a5ac749b590
1 /*
2 * offload engine driver for the Intel Xscale series of i/o processors
3 * Copyright © 2006, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 */
15
16 /*
17 * This driver supports the asynchrounous DMA copy and RAID engines available
18 * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x)
19 */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/spinlock.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/memory.h>
29 #include <linux/ioport.h>
30 #include <linux/raid/pq.h>
31 #include <linux/slab.h>
32
33 #include <mach/adma.h>
34
35 #include "dmaengine.h"
36
37 #define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common)
38 #define to_iop_adma_device(dev) \
39 container_of(dev, struct iop_adma_device, common)
40 #define tx_to_iop_adma_slot(tx) \
41 container_of(tx, struct iop_adma_desc_slot, async_tx)
42
43 /**
44 * iop_adma_free_slots - flags descriptor slots for reuse
45 * @slot: Slot to free
46 * Caller must hold &iop_chan->lock while calling this function
47 */
48 static void iop_adma_free_slots(struct iop_adma_desc_slot *slot)
49 {
50 int stride = slot->slots_per_op;
51
52 while (stride--) {
53 slot->slots_per_op = 0;
54 slot = list_entry(slot->slot_node.next,
55 struct iop_adma_desc_slot,
56 slot_node);
57 }
58 }
59
60 static dma_cookie_t
61 iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
62 struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
63 {
64 struct dma_async_tx_descriptor *tx = &desc->async_tx;
65
66 BUG_ON(tx->cookie < 0);
67 if (tx->cookie > 0) {
68 cookie = tx->cookie;
69 tx->cookie = 0;
70
71 /* call the callback (must not sleep or submit new
72 * operations to this channel)
73 */
74 if (tx->callback)
75 tx->callback(tx->callback_param);
76
77 dma_descriptor_unmap(tx);
78 if (desc->group_head)
79 desc->group_head = NULL;
80 }
81
82 /* run dependent operations */
83 dma_run_dependencies(tx);
84
85 return cookie;
86 }
87
88 static int
89 iop_adma_clean_slot(struct iop_adma_desc_slot *desc,
90 struct iop_adma_chan *iop_chan)
91 {
92 /* the client is allowed to attach dependent operations
93 * until 'ack' is set
94 */
95 if (!async_tx_test_ack(&desc->async_tx))
96 return 0;
97
98 /* leave the last descriptor in the chain
99 * so we can append to it
100 */
101 if (desc->chain_node.next == &iop_chan->chain)
102 return 1;
103
104 dev_dbg(iop_chan->device->common.dev,
105 "\tfree slot: %d slots_per_op: %d\n",
106 desc->idx, desc->slots_per_op);
107
108 list_del(&desc->chain_node);
109 iop_adma_free_slots(desc);
110
111 return 0;
112 }
113
114 static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
115 {
116 struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL;
117 dma_cookie_t cookie = 0;
118 u32 current_desc = iop_chan_get_current_descriptor(iop_chan);
119 int busy = iop_chan_is_busy(iop_chan);
120 int seen_current = 0, slot_cnt = 0, slots_per_op = 0;
121
122 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
123 /* free completed slots from the chain starting with
124 * the oldest descriptor
125 */
126 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
127 chain_node) {
128 pr_debug("\tcookie: %d slot: %d busy: %d "
129 "this_desc: %#x next_desc: %#x ack: %d\n",
130 iter->async_tx.cookie, iter->idx, busy,
131 iter->async_tx.phys, iop_desc_get_next_desc(iter),
132 async_tx_test_ack(&iter->async_tx));
133 prefetch(_iter);
134 prefetch(&_iter->async_tx);
135
136 /* do not advance past the current descriptor loaded into the
137 * hardware channel, subsequent descriptors are either in
138 * process or have not been submitted
139 */
140 if (seen_current)
141 break;
142
143 /* stop the search if we reach the current descriptor and the
144 * channel is busy, or if it appears that the current descriptor
145 * needs to be re-read (i.e. has been appended to)
146 */
147 if (iter->async_tx.phys == current_desc) {
148 BUG_ON(seen_current++);
149 if (busy || iop_desc_get_next_desc(iter))
150 break;
151 }
152
153 /* detect the start of a group transaction */
154 if (!slot_cnt && !slots_per_op) {
155 slot_cnt = iter->slot_cnt;
156 slots_per_op = iter->slots_per_op;
157 if (slot_cnt <= slots_per_op) {
158 slot_cnt = 0;
159 slots_per_op = 0;
160 }
161 }
162
163 if (slot_cnt) {
164 pr_debug("\tgroup++\n");
165 if (!grp_start)
166 grp_start = iter;
167 slot_cnt -= slots_per_op;
168 }
169
170 /* all the members of a group are complete */
171 if (slots_per_op != 0 && slot_cnt == 0) {
172 struct iop_adma_desc_slot *grp_iter, *_grp_iter;
173 int end_of_chain = 0;
174 pr_debug("\tgroup end\n");
175
176 /* collect the total results */
177 if (grp_start->xor_check_result) {
178 u32 zero_sum_result = 0;
179 slot_cnt = grp_start->slot_cnt;
180 grp_iter = grp_start;
181
182 list_for_each_entry_from(grp_iter,
183 &iop_chan->chain, chain_node) {
184 zero_sum_result |=
185 iop_desc_get_zero_result(grp_iter);
186 pr_debug("\titer%d result: %d\n",
187 grp_iter->idx, zero_sum_result);
188 slot_cnt -= slots_per_op;
189 if (slot_cnt == 0)
190 break;
191 }
192 pr_debug("\tgrp_start->xor_check_result: %p\n",
193 grp_start->xor_check_result);
194 *grp_start->xor_check_result = zero_sum_result;
195 }
196
197 /* clean up the group */
198 slot_cnt = grp_start->slot_cnt;
199 grp_iter = grp_start;
200 list_for_each_entry_safe_from(grp_iter, _grp_iter,
201 &iop_chan->chain, chain_node) {
202 cookie = iop_adma_run_tx_complete_actions(
203 grp_iter, iop_chan, cookie);
204
205 slot_cnt -= slots_per_op;
206 end_of_chain = iop_adma_clean_slot(grp_iter,
207 iop_chan);
208
209 if (slot_cnt == 0 || end_of_chain)
210 break;
211 }
212
213 /* the group should be complete at this point */
214 BUG_ON(slot_cnt);
215
216 slots_per_op = 0;
217 grp_start = NULL;
218 if (end_of_chain)
219 break;
220 else
221 continue;
222 } else if (slots_per_op) /* wait for group completion */
223 continue;
224
225 /* write back zero sum results (single descriptor case) */
226 if (iter->xor_check_result && iter->async_tx.cookie)
227 *iter->xor_check_result =
228 iop_desc_get_zero_result(iter);
229
230 cookie = iop_adma_run_tx_complete_actions(
231 iter, iop_chan, cookie);
232
233 if (iop_adma_clean_slot(iter, iop_chan))
234 break;
235 }
236
237 if (cookie > 0) {
238 iop_chan->common.completed_cookie = cookie;
239 pr_debug("\tcompleted cookie %d\n", cookie);
240 }
241 }
242
243 static void
244 iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
245 {
246 spin_lock_bh(&iop_chan->lock);
247 __iop_adma_slot_cleanup(iop_chan);
248 spin_unlock_bh(&iop_chan->lock);
249 }
250
251 static void iop_adma_tasklet(unsigned long data)
252 {
253 struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
254
255 /* lockdep will flag depedency submissions as potentially
256 * recursive locking, this is not the case as a dependency
257 * submission will never recurse a channels submit routine.
258 * There are checks in async_tx.c to prevent this.
259 */
260 spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING);
261 __iop_adma_slot_cleanup(iop_chan);
262 spin_unlock(&iop_chan->lock);
263 }
264
265 static struct iop_adma_desc_slot *
266 iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots,
267 int slots_per_op)
268 {
269 struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL;
270 LIST_HEAD(chain);
271 int slots_found, retry = 0;
272
273 /* start search from the last allocated descrtiptor
274 * if a contiguous allocation can not be found start searching
275 * from the beginning of the list
276 */
277 retry:
278 slots_found = 0;
279 if (retry == 0)
280 iter = iop_chan->last_used;
281 else
282 iter = list_entry(&iop_chan->all_slots,
283 struct iop_adma_desc_slot,
284 slot_node);
285
286 list_for_each_entry_safe_continue(
287 iter, _iter, &iop_chan->all_slots, slot_node) {
288 prefetch(_iter);
289 prefetch(&_iter->async_tx);
290 if (iter->slots_per_op) {
291 /* give up after finding the first busy slot
292 * on the second pass through the list
293 */
294 if (retry)
295 break;
296
297 slots_found = 0;
298 continue;
299 }
300
301 /* start the allocation if the slot is correctly aligned */
302 if (!slots_found++) {
303 if (iop_desc_is_aligned(iter, slots_per_op))
304 alloc_start = iter;
305 else {
306 slots_found = 0;
307 continue;
308 }
309 }
310
311 if (slots_found == num_slots) {
312 struct iop_adma_desc_slot *alloc_tail = NULL;
313 struct iop_adma_desc_slot *last_used = NULL;
314 iter = alloc_start;
315 while (num_slots) {
316 int i;
317 dev_dbg(iop_chan->device->common.dev,
318 "allocated slot: %d "
319 "(desc %p phys: %#x) slots_per_op %d\n",
320 iter->idx, iter->hw_desc,
321 iter->async_tx.phys, slots_per_op);
322
323 /* pre-ack all but the last descriptor */
324 if (num_slots != slots_per_op)
325 async_tx_ack(&iter->async_tx);
326
327 list_add_tail(&iter->chain_node, &chain);
328 alloc_tail = iter;
329 iter->async_tx.cookie = 0;
330 iter->slot_cnt = num_slots;
331 iter->xor_check_result = NULL;
332 for (i = 0; i < slots_per_op; i++) {
333 iter->slots_per_op = slots_per_op - i;
334 last_used = iter;
335 iter = list_entry(iter->slot_node.next,
336 struct iop_adma_desc_slot,
337 slot_node);
338 }
339 num_slots -= slots_per_op;
340 }
341 alloc_tail->group_head = alloc_start;
342 alloc_tail->async_tx.cookie = -EBUSY;
343 list_splice(&chain, &alloc_tail->tx_list);
344 iop_chan->last_used = last_used;
345 iop_desc_clear_next_desc(alloc_start);
346 iop_desc_clear_next_desc(alloc_tail);
347 return alloc_tail;
348 }
349 }
350 if (!retry++)
351 goto retry;
352
353 /* perform direct reclaim if the allocation fails */
354 __iop_adma_slot_cleanup(iop_chan);
355
356 return NULL;
357 }
358
359 static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan)
360 {
361 dev_dbg(iop_chan->device->common.dev, "pending: %d\n",
362 iop_chan->pending);
363
364 if (iop_chan->pending >= IOP_ADMA_THRESHOLD) {
365 iop_chan->pending = 0;
366 iop_chan_append(iop_chan);
367 }
368 }
369
370 static dma_cookie_t
371 iop_adma_tx_submit(struct dma_async_tx_descriptor *tx)
372 {
373 struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx);
374 struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan);
375 struct iop_adma_desc_slot *grp_start, *old_chain_tail;
376 int slot_cnt;
377 int slots_per_op;
378 dma_cookie_t cookie;
379 dma_addr_t next_dma;
380
381 grp_start = sw_desc->group_head;
382 slot_cnt = grp_start->slot_cnt;
383 slots_per_op = grp_start->slots_per_op;
384
385 spin_lock_bh(&iop_chan->lock);
386 cookie = dma_cookie_assign(tx);
387
388 old_chain_tail = list_entry(iop_chan->chain.prev,
389 struct iop_adma_desc_slot, chain_node);
390 list_splice_init(&sw_desc->tx_list,
391 &old_chain_tail->chain_node);
392
393 /* fix up the hardware chain */
394 next_dma = grp_start->async_tx.phys;
395 iop_desc_set_next_desc(old_chain_tail, next_dma);
396 BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */
397
398 /* check for pre-chained descriptors */
399 iop_paranoia(iop_desc_get_next_desc(sw_desc));
400
401 /* increment the pending count by the number of slots
402 * memcpy operations have a 1:1 (slot:operation) relation
403 * other operations are heavier and will pop the threshold
404 * more often.
405 */
406 iop_chan->pending += slot_cnt;
407 iop_adma_check_threshold(iop_chan);
408 spin_unlock_bh(&iop_chan->lock);
409
410 dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n",
411 __func__, sw_desc->async_tx.cookie, sw_desc->idx);
412
413 return cookie;
414 }
415
416 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan);
417 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan);
418
419 /**
420 * iop_adma_alloc_chan_resources - returns the number of allocated descriptors
421 * @chan - allocate descriptor resources for this channel
422 * @client - current client requesting the channel be ready for requests
423 *
424 * Note: We keep the slots for 1 operation on iop_chan->chain at all times. To
425 * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be
426 * greater than 2x the number slots needed to satisfy a device->max_xor
427 * request.
428 * */
429 static int iop_adma_alloc_chan_resources(struct dma_chan *chan)
430 {
431 char *hw_desc;
432 int idx;
433 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
434 struct iop_adma_desc_slot *slot = NULL;
435 int init = iop_chan->slots_allocated ? 0 : 1;
436 struct iop_adma_platform_data *plat_data =
437 dev_get_platdata(&iop_chan->device->pdev->dev);
438 int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE;
439
440 /* Allocate descriptor slots */
441 do {
442 idx = iop_chan->slots_allocated;
443 if (idx == num_descs_in_pool)
444 break;
445
446 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
447 if (!slot) {
448 printk(KERN_INFO "IOP ADMA Channel only initialized"
449 " %d descriptor slots", idx);
450 break;
451 }
452 hw_desc = (char *) iop_chan->device->dma_desc_pool_virt;
453 slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
454
455 dma_async_tx_descriptor_init(&slot->async_tx, chan);
456 slot->async_tx.tx_submit = iop_adma_tx_submit;
457 INIT_LIST_HEAD(&slot->tx_list);
458 INIT_LIST_HEAD(&slot->chain_node);
459 INIT_LIST_HEAD(&slot->slot_node);
460 hw_desc = (char *) iop_chan->device->dma_desc_pool;
461 slot->async_tx.phys =
462 (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE];
463 slot->idx = idx;
464
465 spin_lock_bh(&iop_chan->lock);
466 iop_chan->slots_allocated++;
467 list_add_tail(&slot->slot_node, &iop_chan->all_slots);
468 spin_unlock_bh(&iop_chan->lock);
469 } while (iop_chan->slots_allocated < num_descs_in_pool);
470
471 if (idx && !iop_chan->last_used)
472 iop_chan->last_used = list_entry(iop_chan->all_slots.next,
473 struct iop_adma_desc_slot,
474 slot_node);
475
476 dev_dbg(iop_chan->device->common.dev,
477 "allocated %d descriptor slots last_used: %p\n",
478 iop_chan->slots_allocated, iop_chan->last_used);
479
480 /* initialize the channel and the chain with a null operation */
481 if (init) {
482 if (dma_has_cap(DMA_MEMCPY,
483 iop_chan->device->common.cap_mask))
484 iop_chan_start_null_memcpy(iop_chan);
485 else if (dma_has_cap(DMA_XOR,
486 iop_chan->device->common.cap_mask))
487 iop_chan_start_null_xor(iop_chan);
488 else
489 BUG();
490 }
491
492 return (idx > 0) ? idx : -ENOMEM;
493 }
494
495 static struct dma_async_tx_descriptor *
496 iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags)
497 {
498 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
499 struct iop_adma_desc_slot *sw_desc, *grp_start;
500 int slot_cnt, slots_per_op;
501
502 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
503
504 spin_lock_bh(&iop_chan->lock);
505 slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan);
506 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
507 if (sw_desc) {
508 grp_start = sw_desc->group_head;
509 iop_desc_init_interrupt(grp_start, iop_chan);
510 sw_desc->async_tx.flags = flags;
511 }
512 spin_unlock_bh(&iop_chan->lock);
513
514 return sw_desc ? &sw_desc->async_tx : NULL;
515 }
516
517 static struct dma_async_tx_descriptor *
518 iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest,
519 dma_addr_t dma_src, size_t len, unsigned long flags)
520 {
521 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
522 struct iop_adma_desc_slot *sw_desc, *grp_start;
523 int slot_cnt, slots_per_op;
524
525 if (unlikely(!len))
526 return NULL;
527 BUG_ON(len > IOP_ADMA_MAX_BYTE_COUNT);
528
529 dev_dbg(iop_chan->device->common.dev, "%s len: %u\n",
530 __func__, len);
531
532 spin_lock_bh(&iop_chan->lock);
533 slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op);
534 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
535 if (sw_desc) {
536 grp_start = sw_desc->group_head;
537 iop_desc_init_memcpy(grp_start, flags);
538 iop_desc_set_byte_count(grp_start, iop_chan, len);
539 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
540 iop_desc_set_memcpy_src_addr(grp_start, dma_src);
541 sw_desc->async_tx.flags = flags;
542 }
543 spin_unlock_bh(&iop_chan->lock);
544
545 return sw_desc ? &sw_desc->async_tx : NULL;
546 }
547
548 static struct dma_async_tx_descriptor *
549 iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest,
550 dma_addr_t *dma_src, unsigned int src_cnt, size_t len,
551 unsigned long flags)
552 {
553 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
554 struct iop_adma_desc_slot *sw_desc, *grp_start;
555 int slot_cnt, slots_per_op;
556
557 if (unlikely(!len))
558 return NULL;
559 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
560
561 dev_dbg(iop_chan->device->common.dev,
562 "%s src_cnt: %d len: %u flags: %lx\n",
563 __func__, src_cnt, len, flags);
564
565 spin_lock_bh(&iop_chan->lock);
566 slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op);
567 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
568 if (sw_desc) {
569 grp_start = sw_desc->group_head;
570 iop_desc_init_xor(grp_start, src_cnt, flags);
571 iop_desc_set_byte_count(grp_start, iop_chan, len);
572 iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest);
573 sw_desc->async_tx.flags = flags;
574 while (src_cnt--)
575 iop_desc_set_xor_src_addr(grp_start, src_cnt,
576 dma_src[src_cnt]);
577 }
578 spin_unlock_bh(&iop_chan->lock);
579
580 return sw_desc ? &sw_desc->async_tx : NULL;
581 }
582
583 static struct dma_async_tx_descriptor *
584 iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src,
585 unsigned int src_cnt, size_t len, u32 *result,
586 unsigned long flags)
587 {
588 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
589 struct iop_adma_desc_slot *sw_desc, *grp_start;
590 int slot_cnt, slots_per_op;
591
592 if (unlikely(!len))
593 return NULL;
594
595 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
596 __func__, src_cnt, len);
597
598 spin_lock_bh(&iop_chan->lock);
599 slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op);
600 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
601 if (sw_desc) {
602 grp_start = sw_desc->group_head;
603 iop_desc_init_zero_sum(grp_start, src_cnt, flags);
604 iop_desc_set_zero_sum_byte_count(grp_start, len);
605 grp_start->xor_check_result = result;
606 pr_debug("\t%s: grp_start->xor_check_result: %p\n",
607 __func__, grp_start->xor_check_result);
608 sw_desc->async_tx.flags = flags;
609 while (src_cnt--)
610 iop_desc_set_zero_sum_src_addr(grp_start, src_cnt,
611 dma_src[src_cnt]);
612 }
613 spin_unlock_bh(&iop_chan->lock);
614
615 return sw_desc ? &sw_desc->async_tx : NULL;
616 }
617
618 static struct dma_async_tx_descriptor *
619 iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
620 unsigned int src_cnt, const unsigned char *scf, size_t len,
621 unsigned long flags)
622 {
623 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
624 struct iop_adma_desc_slot *sw_desc, *g;
625 int slot_cnt, slots_per_op;
626 int continue_srcs;
627
628 if (unlikely(!len))
629 return NULL;
630 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
631
632 dev_dbg(iop_chan->device->common.dev,
633 "%s src_cnt: %d len: %u flags: %lx\n",
634 __func__, src_cnt, len, flags);
635
636 if (dmaf_p_disabled_continue(flags))
637 continue_srcs = 1+src_cnt;
638 else if (dmaf_continue(flags))
639 continue_srcs = 3+src_cnt;
640 else
641 continue_srcs = 0+src_cnt;
642
643 spin_lock_bh(&iop_chan->lock);
644 slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op);
645 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
646 if (sw_desc) {
647 int i;
648
649 g = sw_desc->group_head;
650 iop_desc_set_byte_count(g, iop_chan, len);
651
652 /* even if P is disabled its destination address (bits
653 * [3:0]) must match Q. It is ok if P points to an
654 * invalid address, it won't be written.
655 */
656 if (flags & DMA_PREP_PQ_DISABLE_P)
657 dst[0] = dst[1] & 0x7;
658
659 iop_desc_set_pq_addr(g, dst);
660 sw_desc->async_tx.flags = flags;
661 for (i = 0; i < src_cnt; i++)
662 iop_desc_set_pq_src_addr(g, i, src[i], scf[i]);
663
664 /* if we are continuing a previous operation factor in
665 * the old p and q values, see the comment for dma_maxpq
666 * in include/linux/dmaengine.h
667 */
668 if (dmaf_p_disabled_continue(flags))
669 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
670 else if (dmaf_continue(flags)) {
671 iop_desc_set_pq_src_addr(g, i++, dst[0], 0);
672 iop_desc_set_pq_src_addr(g, i++, dst[1], 1);
673 iop_desc_set_pq_src_addr(g, i++, dst[1], 0);
674 }
675 iop_desc_init_pq(g, i, flags);
676 }
677 spin_unlock_bh(&iop_chan->lock);
678
679 return sw_desc ? &sw_desc->async_tx : NULL;
680 }
681
682 static struct dma_async_tx_descriptor *
683 iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
684 unsigned int src_cnt, const unsigned char *scf,
685 size_t len, enum sum_check_flags *pqres,
686 unsigned long flags)
687 {
688 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
689 struct iop_adma_desc_slot *sw_desc, *g;
690 int slot_cnt, slots_per_op;
691
692 if (unlikely(!len))
693 return NULL;
694 BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT);
695
696 dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n",
697 __func__, src_cnt, len);
698
699 spin_lock_bh(&iop_chan->lock);
700 slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op);
701 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
702 if (sw_desc) {
703 /* for validate operations p and q are tagged onto the
704 * end of the source list
705 */
706 int pq_idx = src_cnt;
707
708 g = sw_desc->group_head;
709 iop_desc_init_pq_zero_sum(g, src_cnt+2, flags);
710 iop_desc_set_pq_zero_sum_byte_count(g, len);
711 g->pq_check_result = pqres;
712 pr_debug("\t%s: g->pq_check_result: %p\n",
713 __func__, g->pq_check_result);
714 sw_desc->async_tx.flags = flags;
715 while (src_cnt--)
716 iop_desc_set_pq_zero_sum_src_addr(g, src_cnt,
717 src[src_cnt],
718 scf[src_cnt]);
719 iop_desc_set_pq_zero_sum_addr(g, pq_idx, src);
720 }
721 spin_unlock_bh(&iop_chan->lock);
722
723 return sw_desc ? &sw_desc->async_tx : NULL;
724 }
725
726 static void iop_adma_free_chan_resources(struct dma_chan *chan)
727 {
728 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
729 struct iop_adma_desc_slot *iter, *_iter;
730 int in_use_descs = 0;
731
732 iop_adma_slot_cleanup(iop_chan);
733
734 spin_lock_bh(&iop_chan->lock);
735 list_for_each_entry_safe(iter, _iter, &iop_chan->chain,
736 chain_node) {
737 in_use_descs++;
738 list_del(&iter->chain_node);
739 }
740 list_for_each_entry_safe_reverse(
741 iter, _iter, &iop_chan->all_slots, slot_node) {
742 list_del(&iter->slot_node);
743 kfree(iter);
744 iop_chan->slots_allocated--;
745 }
746 iop_chan->last_used = NULL;
747
748 dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n",
749 __func__, iop_chan->slots_allocated);
750 spin_unlock_bh(&iop_chan->lock);
751
752 /* one is ok since we left it on there on purpose */
753 if (in_use_descs > 1)
754 printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n",
755 in_use_descs - 1);
756 }
757
758 /**
759 * iop_adma_status - poll the status of an ADMA transaction
760 * @chan: ADMA channel handle
761 * @cookie: ADMA transaction identifier
762 * @txstate: a holder for the current state of the channel or NULL
763 */
764 static enum dma_status iop_adma_status(struct dma_chan *chan,
765 dma_cookie_t cookie,
766 struct dma_tx_state *txstate)
767 {
768 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
769 int ret;
770
771 ret = dma_cookie_status(chan, cookie, txstate);
772 if (ret == DMA_COMPLETE)
773 return ret;
774
775 iop_adma_slot_cleanup(iop_chan);
776
777 return dma_cookie_status(chan, cookie, txstate);
778 }
779
780 static irqreturn_t iop_adma_eot_handler(int irq, void *data)
781 {
782 struct iop_adma_chan *chan = data;
783
784 dev_dbg(chan->device->common.dev, "%s\n", __func__);
785
786 tasklet_schedule(&chan->irq_tasklet);
787
788 iop_adma_device_clear_eot_status(chan);
789
790 return IRQ_HANDLED;
791 }
792
793 static irqreturn_t iop_adma_eoc_handler(int irq, void *data)
794 {
795 struct iop_adma_chan *chan = data;
796
797 dev_dbg(chan->device->common.dev, "%s\n", __func__);
798
799 tasklet_schedule(&chan->irq_tasklet);
800
801 iop_adma_device_clear_eoc_status(chan);
802
803 return IRQ_HANDLED;
804 }
805
806 static irqreturn_t iop_adma_err_handler(int irq, void *data)
807 {
808 struct iop_adma_chan *chan = data;
809 unsigned long status = iop_chan_get_status(chan);
810
811 dev_err(chan->device->common.dev,
812 "error ( %s%s%s%s%s%s%s)\n",
813 iop_is_err_int_parity(status, chan) ? "int_parity " : "",
814 iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "",
815 iop_is_err_int_tabort(status, chan) ? "int_tabort " : "",
816 iop_is_err_int_mabort(status, chan) ? "int_mabort " : "",
817 iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "",
818 iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "",
819 iop_is_err_split_tx(status, chan) ? "split_tx " : "");
820
821 iop_adma_device_clear_err_status(chan);
822
823 BUG();
824
825 return IRQ_HANDLED;
826 }
827
828 static void iop_adma_issue_pending(struct dma_chan *chan)
829 {
830 struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
831
832 if (iop_chan->pending) {
833 iop_chan->pending = 0;
834 iop_chan_append(iop_chan);
835 }
836 }
837
838 /*
839 * Perform a transaction to verify the HW works.
840 */
841 #define IOP_ADMA_TEST_SIZE 2000
842
843 static int iop_adma_memcpy_self_test(struct iop_adma_device *device)
844 {
845 int i;
846 void *src, *dest;
847 dma_addr_t src_dma, dest_dma;
848 struct dma_chan *dma_chan;
849 dma_cookie_t cookie;
850 struct dma_async_tx_descriptor *tx;
851 int err = 0;
852 struct iop_adma_chan *iop_chan;
853
854 dev_dbg(device->common.dev, "%s\n", __func__);
855
856 src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
857 if (!src)
858 return -ENOMEM;
859 dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL);
860 if (!dest) {
861 kfree(src);
862 return -ENOMEM;
863 }
864
865 /* Fill in src buffer */
866 for (i = 0; i < IOP_ADMA_TEST_SIZE; i++)
867 ((u8 *) src)[i] = (u8)i;
868
869 /* Start copy, using first DMA channel */
870 dma_chan = container_of(device->common.channels.next,
871 struct dma_chan,
872 device_node);
873 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
874 err = -ENODEV;
875 goto out;
876 }
877
878 dest_dma = dma_map_single(dma_chan->device->dev, dest,
879 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
880 src_dma = dma_map_single(dma_chan->device->dev, src,
881 IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
882 tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
883 IOP_ADMA_TEST_SIZE,
884 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
885
886 cookie = iop_adma_tx_submit(tx);
887 iop_adma_issue_pending(dma_chan);
888 msleep(1);
889
890 if (iop_adma_status(dma_chan, cookie, NULL) !=
891 DMA_COMPLETE) {
892 dev_err(dma_chan->device->dev,
893 "Self-test copy timed out, disabling\n");
894 err = -ENODEV;
895 goto free_resources;
896 }
897
898 iop_chan = to_iop_adma_chan(dma_chan);
899 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
900 IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE);
901 if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) {
902 dev_err(dma_chan->device->dev,
903 "Self-test copy failed compare, disabling\n");
904 err = -ENODEV;
905 goto free_resources;
906 }
907
908 free_resources:
909 iop_adma_free_chan_resources(dma_chan);
910 out:
911 kfree(src);
912 kfree(dest);
913 return err;
914 }
915
916 #define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */
917 static int
918 iop_adma_xor_val_self_test(struct iop_adma_device *device)
919 {
920 int i, src_idx;
921 struct page *dest;
922 struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST];
923 struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
924 dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1];
925 dma_addr_t dest_dma;
926 struct dma_async_tx_descriptor *tx;
927 struct dma_chan *dma_chan;
928 dma_cookie_t cookie;
929 u8 cmp_byte = 0;
930 u32 cmp_word;
931 u32 zero_sum_result;
932 int err = 0;
933 struct iop_adma_chan *iop_chan;
934
935 dev_dbg(device->common.dev, "%s\n", __func__);
936
937 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
938 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
939 if (!xor_srcs[src_idx]) {
940 while (src_idx--)
941 __free_page(xor_srcs[src_idx]);
942 return -ENOMEM;
943 }
944 }
945
946 dest = alloc_page(GFP_KERNEL);
947 if (!dest) {
948 while (src_idx--)
949 __free_page(xor_srcs[src_idx]);
950 return -ENOMEM;
951 }
952
953 /* Fill in src buffers */
954 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) {
955 u8 *ptr = page_address(xor_srcs[src_idx]);
956 for (i = 0; i < PAGE_SIZE; i++)
957 ptr[i] = (1 << src_idx);
958 }
959
960 for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++)
961 cmp_byte ^= (u8) (1 << src_idx);
962
963 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
964 (cmp_byte << 8) | cmp_byte;
965
966 memset(page_address(dest), 0, PAGE_SIZE);
967
968 dma_chan = container_of(device->common.channels.next,
969 struct dma_chan,
970 device_node);
971 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
972 err = -ENODEV;
973 goto out;
974 }
975
976 /* test xor */
977 dest_dma = dma_map_page(dma_chan->device->dev, dest, 0,
978 PAGE_SIZE, DMA_FROM_DEVICE);
979 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
980 dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i],
981 0, PAGE_SIZE, DMA_TO_DEVICE);
982 tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
983 IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
984 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
985
986 cookie = iop_adma_tx_submit(tx);
987 iop_adma_issue_pending(dma_chan);
988 msleep(8);
989
990 if (iop_adma_status(dma_chan, cookie, NULL) !=
991 DMA_COMPLETE) {
992 dev_err(dma_chan->device->dev,
993 "Self-test xor timed out, disabling\n");
994 err = -ENODEV;
995 goto free_resources;
996 }
997
998 iop_chan = to_iop_adma_chan(dma_chan);
999 dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma,
1000 PAGE_SIZE, DMA_FROM_DEVICE);
1001 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
1002 u32 *ptr = page_address(dest);
1003 if (ptr[i] != cmp_word) {
1004 dev_err(dma_chan->device->dev,
1005 "Self-test xor failed compare, disabling\n");
1006 err = -ENODEV;
1007 goto free_resources;
1008 }
1009 }
1010 dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma,
1011 PAGE_SIZE, DMA_TO_DEVICE);
1012
1013 /* skip zero sum if the capability is not present */
1014 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
1015 goto free_resources;
1016
1017 /* zero sum the sources with the destintation page */
1018 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1019 zero_sum_srcs[i] = xor_srcs[i];
1020 zero_sum_srcs[i] = dest;
1021
1022 zero_sum_result = 1;
1023
1024 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1025 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1026 zero_sum_srcs[i], 0, PAGE_SIZE,
1027 DMA_TO_DEVICE);
1028 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1029 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1030 &zero_sum_result,
1031 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1032
1033 cookie = iop_adma_tx_submit(tx);
1034 iop_adma_issue_pending(dma_chan);
1035 msleep(8);
1036
1037 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1038 dev_err(dma_chan->device->dev,
1039 "Self-test zero sum timed out, disabling\n");
1040 err = -ENODEV;
1041 goto free_resources;
1042 }
1043
1044 if (zero_sum_result != 0) {
1045 dev_err(dma_chan->device->dev,
1046 "Self-test zero sum failed compare, disabling\n");
1047 err = -ENODEV;
1048 goto free_resources;
1049 }
1050
1051 /* test for non-zero parity sum */
1052 zero_sum_result = 0;
1053 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++)
1054 dma_srcs[i] = dma_map_page(dma_chan->device->dev,
1055 zero_sum_srcs[i], 0, PAGE_SIZE,
1056 DMA_TO_DEVICE);
1057 tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs,
1058 IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE,
1059 &zero_sum_result,
1060 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1061
1062 cookie = iop_adma_tx_submit(tx);
1063 iop_adma_issue_pending(dma_chan);
1064 msleep(8);
1065
1066 if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1067 dev_err(dma_chan->device->dev,
1068 "Self-test non-zero sum timed out, disabling\n");
1069 err = -ENODEV;
1070 goto free_resources;
1071 }
1072
1073 if (zero_sum_result != 1) {
1074 dev_err(dma_chan->device->dev,
1075 "Self-test non-zero sum failed compare, disabling\n");
1076 err = -ENODEV;
1077 goto free_resources;
1078 }
1079
1080 free_resources:
1081 iop_adma_free_chan_resources(dma_chan);
1082 out:
1083 src_idx = IOP_ADMA_NUM_SRC_TEST;
1084 while (src_idx--)
1085 __free_page(xor_srcs[src_idx]);
1086 __free_page(dest);
1087 return err;
1088 }
1089
1090 #ifdef CONFIG_RAID6_PQ
1091 static int
1092 iop_adma_pq_zero_sum_self_test(struct iop_adma_device *device)
1093 {
1094 /* combined sources, software pq results, and extra hw pq results */
1095 struct page *pq[IOP_ADMA_NUM_SRC_TEST+2+2];
1096 /* ptr to the extra hw pq buffers defined above */
1097 struct page **pq_hw = &pq[IOP_ADMA_NUM_SRC_TEST+2];
1098 /* address conversion buffers (dma_map / page_address) */
1099 void *pq_sw[IOP_ADMA_NUM_SRC_TEST+2];
1100 dma_addr_t pq_src[IOP_ADMA_NUM_SRC_TEST+2];
1101 dma_addr_t *pq_dest = &pq_src[IOP_ADMA_NUM_SRC_TEST];
1102
1103 int i;
1104 struct dma_async_tx_descriptor *tx;
1105 struct dma_chan *dma_chan;
1106 dma_cookie_t cookie;
1107 u32 zero_sum_result;
1108 int err = 0;
1109 struct device *dev;
1110
1111 dev_dbg(device->common.dev, "%s\n", __func__);
1112
1113 for (i = 0; i < ARRAY_SIZE(pq); i++) {
1114 pq[i] = alloc_page(GFP_KERNEL);
1115 if (!pq[i]) {
1116 while (i--)
1117 __free_page(pq[i]);
1118 return -ENOMEM;
1119 }
1120 }
1121
1122 /* Fill in src buffers */
1123 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) {
1124 pq_sw[i] = page_address(pq[i]);
1125 memset(pq_sw[i], 0x11111111 * (1<<i), PAGE_SIZE);
1126 }
1127 pq_sw[i] = page_address(pq[i]);
1128 pq_sw[i+1] = page_address(pq[i+1]);
1129
1130 dma_chan = container_of(device->common.channels.next,
1131 struct dma_chan,
1132 device_node);
1133 if (iop_adma_alloc_chan_resources(dma_chan) < 1) {
1134 err = -ENODEV;
1135 goto out;
1136 }
1137
1138 dev = dma_chan->device->dev;
1139
1140 /* initialize the dests */
1141 memset(page_address(pq_hw[0]), 0 , PAGE_SIZE);
1142 memset(page_address(pq_hw[1]), 0 , PAGE_SIZE);
1143
1144 /* test pq */
1145 pq_dest[0] = dma_map_page(dev, pq_hw[0], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1146 pq_dest[1] = dma_map_page(dev, pq_hw[1], 0, PAGE_SIZE, DMA_FROM_DEVICE);
1147 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++)
1148 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1149 DMA_TO_DEVICE);
1150
1151 tx = iop_adma_prep_dma_pq(dma_chan, pq_dest, pq_src,
1152 IOP_ADMA_NUM_SRC_TEST, (u8 *)raid6_gfexp,
1153 PAGE_SIZE,
1154 DMA_PREP_INTERRUPT |
1155 DMA_CTRL_ACK);
1156
1157 cookie = iop_adma_tx_submit(tx);
1158 iop_adma_issue_pending(dma_chan);
1159 msleep(8);
1160
1161 if (iop_adma_status(dma_chan, cookie, NULL) !=
1162 DMA_COMPLETE) {
1163 dev_err(dev, "Self-test pq timed out, disabling\n");
1164 err = -ENODEV;
1165 goto free_resources;
1166 }
1167
1168 raid6_call.gen_syndrome(IOP_ADMA_NUM_SRC_TEST+2, PAGE_SIZE, pq_sw);
1169
1170 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST],
1171 page_address(pq_hw[0]), PAGE_SIZE) != 0) {
1172 dev_err(dev, "Self-test p failed compare, disabling\n");
1173 err = -ENODEV;
1174 goto free_resources;
1175 }
1176 if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST+1],
1177 page_address(pq_hw[1]), PAGE_SIZE) != 0) {
1178 dev_err(dev, "Self-test q failed compare, disabling\n");
1179 err = -ENODEV;
1180 goto free_resources;
1181 }
1182
1183 /* test correct zero sum using the software generated pq values */
1184 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1185 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1186 DMA_TO_DEVICE);
1187
1188 zero_sum_result = ~0;
1189 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1190 pq_src, IOP_ADMA_NUM_SRC_TEST,
1191 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1192 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1193
1194 cookie = iop_adma_tx_submit(tx);
1195 iop_adma_issue_pending(dma_chan);
1196 msleep(8);
1197
1198 if (iop_adma_status(dma_chan, cookie, NULL) !=
1199 DMA_COMPLETE) {
1200 dev_err(dev, "Self-test pq-zero-sum timed out, disabling\n");
1201 err = -ENODEV;
1202 goto free_resources;
1203 }
1204
1205 if (zero_sum_result != 0) {
1206 dev_err(dev, "Self-test pq-zero-sum failed to validate: %x\n",
1207 zero_sum_result);
1208 err = -ENODEV;
1209 goto free_resources;
1210 }
1211
1212 /* test incorrect zero sum */
1213 i = IOP_ADMA_NUM_SRC_TEST;
1214 memset(pq_sw[i] + 100, 0, 100);
1215 memset(pq_sw[i+1] + 200, 0, 200);
1216 for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++)
1217 pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE,
1218 DMA_TO_DEVICE);
1219
1220 zero_sum_result = 0;
1221 tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST],
1222 pq_src, IOP_ADMA_NUM_SRC_TEST,
1223 raid6_gfexp, PAGE_SIZE, &zero_sum_result,
1224 DMA_PREP_INTERRUPT|DMA_CTRL_ACK);
1225
1226 cookie = iop_adma_tx_submit(tx);
1227 iop_adma_issue_pending(dma_chan);
1228 msleep(8);
1229
1230 if (iop_adma_status(dma_chan, cookie, NULL) !=
1231 DMA_COMPLETE) {
1232 dev_err(dev, "Self-test !pq-zero-sum timed out, disabling\n");
1233 err = -ENODEV;
1234 goto free_resources;
1235 }
1236
1237 if (zero_sum_result != (SUM_CHECK_P_RESULT | SUM_CHECK_Q_RESULT)) {
1238 dev_err(dev, "Self-test !pq-zero-sum failed to validate: %x\n",
1239 zero_sum_result);
1240 err = -ENODEV;
1241 goto free_resources;
1242 }
1243
1244 free_resources:
1245 iop_adma_free_chan_resources(dma_chan);
1246 out:
1247 i = ARRAY_SIZE(pq);
1248 while (i--)
1249 __free_page(pq[i]);
1250 return err;
1251 }
1252 #endif
1253
1254 static int iop_adma_remove(struct platform_device *dev)
1255 {
1256 struct iop_adma_device *device = platform_get_drvdata(dev);
1257 struct dma_chan *chan, *_chan;
1258 struct iop_adma_chan *iop_chan;
1259 struct iop_adma_platform_data *plat_data = dev_get_platdata(&dev->dev);
1260
1261 dma_async_device_unregister(&device->common);
1262
1263 dma_free_coherent(&dev->dev, plat_data->pool_size,
1264 device->dma_desc_pool_virt, device->dma_desc_pool);
1265
1266 list_for_each_entry_safe(chan, _chan, &device->common.channels,
1267 device_node) {
1268 iop_chan = to_iop_adma_chan(chan);
1269 list_del(&chan->device_node);
1270 kfree(iop_chan);
1271 }
1272 kfree(device);
1273
1274 return 0;
1275 }
1276
1277 static int iop_adma_probe(struct platform_device *pdev)
1278 {
1279 struct resource *res;
1280 int ret = 0, i;
1281 struct iop_adma_device *adev;
1282 struct iop_adma_chan *iop_chan;
1283 struct dma_device *dma_dev;
1284 struct iop_adma_platform_data *plat_data = dev_get_platdata(&pdev->dev);
1285
1286 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1287 if (!res)
1288 return -ENODEV;
1289
1290 if (!devm_request_mem_region(&pdev->dev, res->start,
1291 resource_size(res), pdev->name))
1292 return -EBUSY;
1293
1294 adev = kzalloc(sizeof(*adev), GFP_KERNEL);
1295 if (!adev)
1296 return -ENOMEM;
1297 dma_dev = &adev->common;
1298
1299 /* allocate coherent memory for hardware descriptors
1300 * note: writecombine gives slightly better performance, but
1301 * requires that we explicitly flush the writes
1302 */
1303 adev->dma_desc_pool_virt = dma_alloc_wc(&pdev->dev,
1304 plat_data->pool_size,
1305 &adev->dma_desc_pool,
1306 GFP_KERNEL);
1307 if (!adev->dma_desc_pool_virt) {
1308 ret = -ENOMEM;
1309 goto err_free_adev;
1310 }
1311
1312 dev_dbg(&pdev->dev, "%s: allocated descriptor pool virt %p phys %p\n",
1313 __func__, adev->dma_desc_pool_virt,
1314 (void *) adev->dma_desc_pool);
1315
1316 adev->id = plat_data->hw_id;
1317
1318 /* discover transaction capabilites from the platform data */
1319 dma_dev->cap_mask = plat_data->cap_mask;
1320
1321 adev->pdev = pdev;
1322 platform_set_drvdata(pdev, adev);
1323
1324 INIT_LIST_HEAD(&dma_dev->channels);
1325
1326 /* set base routines */
1327 dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources;
1328 dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
1329 dma_dev->device_tx_status = iop_adma_status;
1330 dma_dev->device_issue_pending = iop_adma_issue_pending;
1331 dma_dev->dev = &pdev->dev;
1332
1333 /* set prep routines based on capability */
1334 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask))
1335 dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy;
1336 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1337 dma_dev->max_xor = iop_adma_get_max_xor();
1338 dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor;
1339 }
1340 if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask))
1341 dma_dev->device_prep_dma_xor_val =
1342 iop_adma_prep_dma_xor_val;
1343 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
1344 dma_set_maxpq(dma_dev, iop_adma_get_max_pq(), 0);
1345 dma_dev->device_prep_dma_pq = iop_adma_prep_dma_pq;
1346 }
1347 if (dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask))
1348 dma_dev->device_prep_dma_pq_val =
1349 iop_adma_prep_dma_pq_val;
1350 if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask))
1351 dma_dev->device_prep_dma_interrupt =
1352 iop_adma_prep_dma_interrupt;
1353
1354 iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL);
1355 if (!iop_chan) {
1356 ret = -ENOMEM;
1357 goto err_free_dma;
1358 }
1359 iop_chan->device = adev;
1360
1361 iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start,
1362 resource_size(res));
1363 if (!iop_chan->mmr_base) {
1364 ret = -ENOMEM;
1365 goto err_free_iop_chan;
1366 }
1367 tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long)
1368 iop_chan);
1369
1370 /* clear errors before enabling interrupts */
1371 iop_adma_device_clear_err_status(iop_chan);
1372
1373 for (i = 0; i < 3; i++) {
1374 irq_handler_t handler[] = { iop_adma_eot_handler,
1375 iop_adma_eoc_handler,
1376 iop_adma_err_handler };
1377 int irq = platform_get_irq(pdev, i);
1378 if (irq < 0) {
1379 ret = -ENXIO;
1380 goto err_free_iop_chan;
1381 } else {
1382 ret = devm_request_irq(&pdev->dev, irq,
1383 handler[i], 0, pdev->name, iop_chan);
1384 if (ret)
1385 goto err_free_iop_chan;
1386 }
1387 }
1388
1389 spin_lock_init(&iop_chan->lock);
1390 INIT_LIST_HEAD(&iop_chan->chain);
1391 INIT_LIST_HEAD(&iop_chan->all_slots);
1392 iop_chan->common.device = dma_dev;
1393 dma_cookie_init(&iop_chan->common);
1394 list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
1395
1396 if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
1397 ret = iop_adma_memcpy_self_test(adev);
1398 dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret);
1399 if (ret)
1400 goto err_free_iop_chan;
1401 }
1402
1403 if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
1404 ret = iop_adma_xor_val_self_test(adev);
1405 dev_dbg(&pdev->dev, "xor self test returned %d\n", ret);
1406 if (ret)
1407 goto err_free_iop_chan;
1408 }
1409
1410 if (dma_has_cap(DMA_PQ, dma_dev->cap_mask) &&
1411 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) {
1412 #ifdef CONFIG_RAID6_PQ
1413 ret = iop_adma_pq_zero_sum_self_test(adev);
1414 dev_dbg(&pdev->dev, "pq self test returned %d\n", ret);
1415 #else
1416 /* can not test raid6, so do not publish capability */
1417 dma_cap_clear(DMA_PQ, dma_dev->cap_mask);
1418 dma_cap_clear(DMA_PQ_VAL, dma_dev->cap_mask);
1419 ret = 0;
1420 #endif
1421 if (ret)
1422 goto err_free_iop_chan;
1423 }
1424
1425 dev_info(&pdev->dev, "Intel(R) IOP: ( %s%s%s%s%s%s)\n",
1426 dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "",
1427 dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "",
1428 dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "",
1429 dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "",
1430 dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "",
1431 dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : "");
1432
1433 dma_async_device_register(dma_dev);
1434 goto out;
1435
1436 err_free_iop_chan:
1437 kfree(iop_chan);
1438 err_free_dma:
1439 dma_free_coherent(&adev->pdev->dev, plat_data->pool_size,
1440 adev->dma_desc_pool_virt, adev->dma_desc_pool);
1441 err_free_adev:
1442 kfree(adev);
1443 out:
1444 return ret;
1445 }
1446
1447 static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan)
1448 {
1449 struct iop_adma_desc_slot *sw_desc, *grp_start;
1450 dma_cookie_t cookie;
1451 int slot_cnt, slots_per_op;
1452
1453 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1454
1455 spin_lock_bh(&iop_chan->lock);
1456 slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op);
1457 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1458 if (sw_desc) {
1459 grp_start = sw_desc->group_head;
1460
1461 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1462 async_tx_ack(&sw_desc->async_tx);
1463 iop_desc_init_memcpy(grp_start, 0);
1464 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1465 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1466 iop_desc_set_memcpy_src_addr(grp_start, 0);
1467
1468 cookie = dma_cookie_assign(&sw_desc->async_tx);
1469
1470 /* initialize the completed cookie to be less than
1471 * the most recently used cookie
1472 */
1473 iop_chan->common.completed_cookie = cookie - 1;
1474
1475 /* channel should not be busy */
1476 BUG_ON(iop_chan_is_busy(iop_chan));
1477
1478 /* clear any prior error-status bits */
1479 iop_adma_device_clear_err_status(iop_chan);
1480
1481 /* disable operation */
1482 iop_chan_disable(iop_chan);
1483
1484 /* set the descriptor address */
1485 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1486
1487 /* 1/ don't add pre-chained descriptors
1488 * 2/ dummy read to flush next_desc write
1489 */
1490 BUG_ON(iop_desc_get_next_desc(sw_desc));
1491
1492 /* run the descriptor */
1493 iop_chan_enable(iop_chan);
1494 } else
1495 dev_err(iop_chan->device->common.dev,
1496 "failed to allocate null descriptor\n");
1497 spin_unlock_bh(&iop_chan->lock);
1498 }
1499
1500 static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan)
1501 {
1502 struct iop_adma_desc_slot *sw_desc, *grp_start;
1503 dma_cookie_t cookie;
1504 int slot_cnt, slots_per_op;
1505
1506 dev_dbg(iop_chan->device->common.dev, "%s\n", __func__);
1507
1508 spin_lock_bh(&iop_chan->lock);
1509 slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op);
1510 sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op);
1511 if (sw_desc) {
1512 grp_start = sw_desc->group_head;
1513 list_splice_init(&sw_desc->tx_list, &iop_chan->chain);
1514 async_tx_ack(&sw_desc->async_tx);
1515 iop_desc_init_null_xor(grp_start, 2, 0);
1516 iop_desc_set_byte_count(grp_start, iop_chan, 0);
1517 iop_desc_set_dest_addr(grp_start, iop_chan, 0);
1518 iop_desc_set_xor_src_addr(grp_start, 0, 0);
1519 iop_desc_set_xor_src_addr(grp_start, 1, 0);
1520
1521 cookie = dma_cookie_assign(&sw_desc->async_tx);
1522
1523 /* initialize the completed cookie to be less than
1524 * the most recently used cookie
1525 */
1526 iop_chan->common.completed_cookie = cookie - 1;
1527
1528 /* channel should not be busy */
1529 BUG_ON(iop_chan_is_busy(iop_chan));
1530
1531 /* clear any prior error-status bits */
1532 iop_adma_device_clear_err_status(iop_chan);
1533
1534 /* disable operation */
1535 iop_chan_disable(iop_chan);
1536
1537 /* set the descriptor address */
1538 iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys);
1539
1540 /* 1/ don't add pre-chained descriptors
1541 * 2/ dummy read to flush next_desc write
1542 */
1543 BUG_ON(iop_desc_get_next_desc(sw_desc));
1544
1545 /* run the descriptor */
1546 iop_chan_enable(iop_chan);
1547 } else
1548 dev_err(iop_chan->device->common.dev,
1549 "failed to allocate null descriptor\n");
1550 spin_unlock_bh(&iop_chan->lock);
1551 }
1552
1553 static struct platform_driver iop_adma_driver = {
1554 .probe = iop_adma_probe,
1555 .remove = iop_adma_remove,
1556 .driver = {
1557 .name = "iop-adma",
1558 },
1559 };
1560
1561 module_platform_driver(iop_adma_driver);
1562
1563 MODULE_AUTHOR("Intel Corporation");
1564 MODULE_DESCRIPTION("IOP ADMA Engine Driver");
1565 MODULE_LICENSE("GPL");
1566 MODULE_ALIAS("platform:iop-adma");
Linux with added FPC-III support