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-rw-r--r--drivers/infiniband/hw/ipath/ipath_user_sdma.c879
1 files changed, 879 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_user_sdma.c b/drivers/infiniband/hw/ipath/ipath_user_sdma.c
new file mode 100644
index 000000000000..86e016916cd1
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_user_sdma.c
@@ -0,0 +1,879 @@
1/*
2 * Copyright (c) 2007, 2008 QLogic Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32#include <linux/mm.h>
33#include <linux/types.h>
34#include <linux/device.h>
35#include <linux/dmapool.h>
36#include <linux/slab.h>
37#include <linux/list.h>
38#include <linux/highmem.h>
39#include <linux/io.h>
40#include <linux/uio.h>
41#include <linux/rbtree.h>
42#include <linux/spinlock.h>
43#include <linux/delay.h>
44
45#include "ipath_kernel.h"
46#include "ipath_user_sdma.h"
47
48/* minimum size of header */
49#define IPATH_USER_SDMA_MIN_HEADER_LENGTH 64
50/* expected size of headers (for dma_pool) */
51#define IPATH_USER_SDMA_EXP_HEADER_LENGTH 64
52/* length mask in PBC (lower 11 bits) */
53#define IPATH_PBC_LENGTH_MASK ((1 << 11) - 1)
54
55struct ipath_user_sdma_pkt {
56 u8 naddr; /* dimension of addr (1..3) ... */
57 u32 counter; /* sdma pkts queued counter for this entry */
58 u64 added; /* global descq number of entries */
59
60 struct {
61 u32 offset; /* offset for kvaddr, addr */
62 u32 length; /* length in page */
63 u8 put_page; /* should we put_page? */
64 u8 dma_mapped; /* is page dma_mapped? */
65 struct page *page; /* may be NULL (coherent mem) */
66 void *kvaddr; /* FIXME: only for pio hack */
67 dma_addr_t addr;
68 } addr[4]; /* max pages, any more and we coalesce */
69 struct list_head list; /* list element */
70};
71
72struct ipath_user_sdma_queue {
73 /*
74 * pkts sent to dma engine are queued on this
75 * list head. the type of the elements of this
76 * list are struct ipath_user_sdma_pkt...
77 */
78 struct list_head sent;
79
80 /* headers with expected length are allocated from here... */
81 char header_cache_name[64];
82 struct dma_pool *header_cache;
83
84 /* packets are allocated from the slab cache... */
85 char pkt_slab_name[64];
86 struct kmem_cache *pkt_slab;
87
88 /* as packets go on the queued queue, they are counted... */
89 u32 counter;
90 u32 sent_counter;
91
92 /* dma page table */
93 struct rb_root dma_pages_root;
94
95 /* protect everything above... */
96 struct mutex lock;
97};
98
99struct ipath_user_sdma_queue *
100ipath_user_sdma_queue_create(struct device *dev, int unit, int port, int sport)
101{
102 struct ipath_user_sdma_queue *pq =
103 kmalloc(sizeof(struct ipath_user_sdma_queue), GFP_KERNEL);
104
105 if (!pq)
106 goto done;
107
108 pq->counter = 0;
109 pq->sent_counter = 0;
110 INIT_LIST_HEAD(&pq->sent);
111
112 mutex_init(&pq->lock);
113
114 snprintf(pq->pkt_slab_name, sizeof(pq->pkt_slab_name),
115 "ipath-user-sdma-pkts-%u-%02u.%02u", unit, port, sport);
116 pq->pkt_slab = kmem_cache_create(pq->pkt_slab_name,
117 sizeof(struct ipath_user_sdma_pkt),
118 0, 0, NULL);
119
120 if (!pq->pkt_slab)
121 goto err_kfree;
122
123 snprintf(pq->header_cache_name, sizeof(pq->header_cache_name),
124 "ipath-user-sdma-headers-%u-%02u.%02u", unit, port, sport);
125 pq->header_cache = dma_pool_create(pq->header_cache_name,
126 dev,
127 IPATH_USER_SDMA_EXP_HEADER_LENGTH,
128 4, 0);
129 if (!pq->header_cache)
130 goto err_slab;
131
132 pq->dma_pages_root = RB_ROOT;
133
134 goto done;
135
136err_slab:
137 kmem_cache_destroy(pq->pkt_slab);
138err_kfree:
139 kfree(pq);
140 pq = NULL;
141
142done:
143 return pq;
144}
145
146static void ipath_user_sdma_init_frag(struct ipath_user_sdma_pkt *pkt,
147 int i, size_t offset, size_t len,
148 int put_page, int dma_mapped,
149 struct page *page,
150 void *kvaddr, dma_addr_t dma_addr)
151{
152 pkt->addr[i].offset = offset;
153 pkt->addr[i].length = len;
154 pkt->addr[i].put_page = put_page;
155 pkt->addr[i].dma_mapped = dma_mapped;
156 pkt->addr[i].page = page;
157 pkt->addr[i].kvaddr = kvaddr;
158 pkt->addr[i].addr = dma_addr;
159}
160
161static void ipath_user_sdma_init_header(struct ipath_user_sdma_pkt *pkt,
162 u32 counter, size_t offset,
163 size_t len, int dma_mapped,
164 struct page *page,
165 void *kvaddr, dma_addr_t dma_addr)
166{
167 pkt->naddr = 1;
168 pkt->counter = counter;
169 ipath_user_sdma_init_frag(pkt, 0, offset, len, 0, dma_mapped, page,
170 kvaddr, dma_addr);
171}
172
173/* we've too many pages in the iovec, coalesce to a single page */
174static int ipath_user_sdma_coalesce(const struct ipath_devdata *dd,
175 struct ipath_user_sdma_pkt *pkt,
176 const struct iovec *iov,
177 unsigned long niov) {
178 int ret = 0;
179 struct page *page = alloc_page(GFP_KERNEL);
180 void *mpage_save;
181 char *mpage;
182 int i;
183 int len = 0;
184 dma_addr_t dma_addr;
185
186 if (!page) {
187 ret = -ENOMEM;
188 goto done;
189 }
190
191 mpage = kmap(page);
192 mpage_save = mpage;
193 for (i = 0; i < niov; i++) {
194 int cfur;
195
196 cfur = copy_from_user(mpage,
197 iov[i].iov_base, iov[i].iov_len);
198 if (cfur) {
199 ret = -EFAULT;
200 goto free_unmap;
201 }
202
203 mpage += iov[i].iov_len;
204 len += iov[i].iov_len;
205 }
206
207 dma_addr = dma_map_page(&dd->pcidev->dev, page, 0, len,
208 DMA_TO_DEVICE);
209 if (dma_mapping_error(dma_addr)) {
210 ret = -ENOMEM;
211 goto free_unmap;
212 }
213
214 ipath_user_sdma_init_frag(pkt, 1, 0, len, 0, 1, page, mpage_save,
215 dma_addr);
216 pkt->naddr = 2;
217
218 goto done;
219
220free_unmap:
221 kunmap(page);
222 __free_page(page);
223done:
224 return ret;
225}
226
227/* how many pages in this iovec element? */
228static int ipath_user_sdma_num_pages(const struct iovec *iov)
229{
230 const unsigned long addr = (unsigned long) iov->iov_base;
231 const unsigned long len = iov->iov_len;
232 const unsigned long spage = addr & PAGE_MASK;
233 const unsigned long epage = (addr + len - 1) & PAGE_MASK;
234
235 return 1 + ((epage - spage) >> PAGE_SHIFT);
236}
237
238/* truncate length to page boundry */
239static int ipath_user_sdma_page_length(unsigned long addr, unsigned long len)
240{
241 const unsigned long offset = addr & ~PAGE_MASK;
242
243 return ((offset + len) > PAGE_SIZE) ? (PAGE_SIZE - offset) : len;
244}
245
246static void ipath_user_sdma_free_pkt_frag(struct device *dev,
247 struct ipath_user_sdma_queue *pq,
248 struct ipath_user_sdma_pkt *pkt,
249 int frag)
250{
251 const int i = frag;
252
253 if (pkt->addr[i].page) {
254 if (pkt->addr[i].dma_mapped)
255 dma_unmap_page(dev,
256 pkt->addr[i].addr,
257 pkt->addr[i].length,
258 DMA_TO_DEVICE);
259
260 if (pkt->addr[i].kvaddr)
261 kunmap(pkt->addr[i].page);
262
263 if (pkt->addr[i].put_page)
264 put_page(pkt->addr[i].page);
265 else
266 __free_page(pkt->addr[i].page);
267 } else if (pkt->addr[i].kvaddr)
268 /* free coherent mem from cache... */
269 dma_pool_free(pq->header_cache,
270 pkt->addr[i].kvaddr, pkt->addr[i].addr);
271}
272
273/* return number of pages pinned... */
274static int ipath_user_sdma_pin_pages(const struct ipath_devdata *dd,
275 struct ipath_user_sdma_pkt *pkt,
276 unsigned long addr, int tlen, int npages)
277{
278 struct page *pages[2];
279 int j;
280 int ret;
281
282 ret = get_user_pages(current, current->mm, addr,
283 npages, 0, 1, pages, NULL);
284
285 if (ret != npages) {
286 int i;
287
288 for (i = 0; i < ret; i++)
289 put_page(pages[i]);
290
291 ret = -ENOMEM;
292 goto done;
293 }
294
295 for (j = 0; j < npages; j++) {
296 /* map the pages... */
297 const int flen =
298 ipath_user_sdma_page_length(addr, tlen);
299 dma_addr_t dma_addr =
300 dma_map_page(&dd->pcidev->dev,
301 pages[j], 0, flen, DMA_TO_DEVICE);
302 unsigned long fofs = addr & ~PAGE_MASK;
303
304 if (dma_mapping_error(dma_addr)) {
305 ret = -ENOMEM;
306 goto done;
307 }
308
309 ipath_user_sdma_init_frag(pkt, pkt->naddr, fofs, flen, 1, 1,
310 pages[j], kmap(pages[j]),
311 dma_addr);
312
313 pkt->naddr++;
314 addr += flen;
315 tlen -= flen;
316 }
317
318done:
319 return ret;
320}
321
322static int ipath_user_sdma_pin_pkt(const struct ipath_devdata *dd,
323 struct ipath_user_sdma_queue *pq,
324 struct ipath_user_sdma_pkt *pkt,
325 const struct iovec *iov,
326 unsigned long niov)
327{
328 int ret = 0;
329 unsigned long idx;
330
331 for (idx = 0; idx < niov; idx++) {
332 const int npages = ipath_user_sdma_num_pages(iov + idx);
333 const unsigned long addr = (unsigned long) iov[idx].iov_base;
334
335 ret = ipath_user_sdma_pin_pages(dd, pkt,
336 addr, iov[idx].iov_len,
337 npages);
338 if (ret < 0)
339 goto free_pkt;
340 }
341
342 goto done;
343
344free_pkt:
345 for (idx = 0; idx < pkt->naddr; idx++)
346 ipath_user_sdma_free_pkt_frag(&dd->pcidev->dev, pq, pkt, idx);
347
348done:
349 return ret;
350}
351
352static int ipath_user_sdma_init_payload(const struct ipath_devdata *dd,
353 struct ipath_user_sdma_queue *pq,
354 struct ipath_user_sdma_pkt *pkt,
355 const struct iovec *iov,
356 unsigned long niov, int npages)
357{
358 int ret = 0;
359
360 if (npages >= ARRAY_SIZE(pkt->addr))
361 ret = ipath_user_sdma_coalesce(dd, pkt, iov, niov);
362 else
363 ret = ipath_user_sdma_pin_pkt(dd, pq, pkt, iov, niov);
364
365 return ret;
366}
367
368/* free a packet list -- return counter value of last packet */
369static void ipath_user_sdma_free_pkt_list(struct device *dev,
370 struct ipath_user_sdma_queue *pq,
371 struct list_head *list)
372{
373 struct ipath_user_sdma_pkt *pkt, *pkt_next;
374
375 list_for_each_entry_safe(pkt, pkt_next, list, list) {
376 int i;
377
378 for (i = 0; i < pkt->naddr; i++)
379 ipath_user_sdma_free_pkt_frag(dev, pq, pkt, i);
380
381 kmem_cache_free(pq->pkt_slab, pkt);
382 }
383}
384
385/*
386 * copy headers, coalesce etc -- pq->lock must be held
387 *
388 * we queue all the packets to list, returning the
389 * number of bytes total. list must be empty initially,
390 * as, if there is an error we clean it...
391 */
392static int ipath_user_sdma_queue_pkts(const struct ipath_devdata *dd,
393 struct ipath_user_sdma_queue *pq,
394 struct list_head *list,
395 const struct iovec *iov,
396 unsigned long niov,
397 int maxpkts)
398{
399 unsigned long idx = 0;
400 int ret = 0;
401 int npkts = 0;
402 struct page *page = NULL;
403 __le32 *pbc;
404 dma_addr_t dma_addr;
405 struct ipath_user_sdma_pkt *pkt = NULL;
406 size_t len;
407 size_t nw;
408 u32 counter = pq->counter;
409 int dma_mapped = 0;
410
411 while (idx < niov && npkts < maxpkts) {
412 const unsigned long addr = (unsigned long) iov[idx].iov_base;
413 const unsigned long idx_save = idx;
414 unsigned pktnw;
415 unsigned pktnwc;
416 int nfrags = 0;
417 int npages = 0;
418 int cfur;
419
420 dma_mapped = 0;
421 len = iov[idx].iov_len;
422 nw = len >> 2;
423 page = NULL;
424
425 pkt = kmem_cache_alloc(pq->pkt_slab, GFP_KERNEL);
426 if (!pkt) {
427 ret = -ENOMEM;
428 goto free_list;
429 }
430
431 if (len < IPATH_USER_SDMA_MIN_HEADER_LENGTH ||
432 len > PAGE_SIZE || len & 3 || addr & 3) {
433 ret = -EINVAL;
434 goto free_pkt;
435 }
436
437 if (len == IPATH_USER_SDMA_EXP_HEADER_LENGTH)
438 pbc = dma_pool_alloc(pq->header_cache, GFP_KERNEL,
439 &dma_addr);
440 else
441 pbc = NULL;
442
443 if (!pbc) {
444 page = alloc_page(GFP_KERNEL);
445 if (!page) {
446 ret = -ENOMEM;
447 goto free_pkt;
448 }
449 pbc = kmap(page);
450 }
451
452 cfur = copy_from_user(pbc, iov[idx].iov_base, len);
453 if (cfur) {
454 ret = -EFAULT;
455 goto free_pbc;
456 }
457
458 /*
459 * this assignment is a bit strange. it's because the
460 * the pbc counts the number of 32 bit words in the full
461 * packet _except_ the first word of the pbc itself...
462 */
463 pktnwc = nw - 1;
464
465 /*
466 * pktnw computation yields the number of 32 bit words
467 * that the caller has indicated in the PBC. note that
468 * this is one less than the total number of words that
469 * goes to the send DMA engine as the first 32 bit word
470 * of the PBC itself is not counted. Armed with this count,
471 * we can verify that the packet is consistent with the
472 * iovec lengths.
473 */
474 pktnw = le32_to_cpu(*pbc) & IPATH_PBC_LENGTH_MASK;
475 if (pktnw < pktnwc || pktnw > pktnwc + (PAGE_SIZE >> 2)) {
476 ret = -EINVAL;
477 goto free_pbc;
478 }
479
480
481 idx++;
482 while (pktnwc < pktnw && idx < niov) {
483 const size_t slen = iov[idx].iov_len;
484 const unsigned long faddr =
485 (unsigned long) iov[idx].iov_base;
486
487 if (slen & 3 || faddr & 3 || !slen ||
488 slen > PAGE_SIZE) {
489 ret = -EINVAL;
490 goto free_pbc;
491 }
492
493 npages++;
494 if ((faddr & PAGE_MASK) !=
495 ((faddr + slen - 1) & PAGE_MASK))
496 npages++;
497
498 pktnwc += slen >> 2;
499 idx++;
500 nfrags++;
501 }
502
503 if (pktnwc != pktnw) {
504 ret = -EINVAL;
505 goto free_pbc;
506 }
507
508 if (page) {
509 dma_addr = dma_map_page(&dd->pcidev->dev,
510 page, 0, len, DMA_TO_DEVICE);
511 if (dma_mapping_error(dma_addr)) {
512 ret = -ENOMEM;
513 goto free_pbc;
514 }
515
516 dma_mapped = 1;
517 }
518
519 ipath_user_sdma_init_header(pkt, counter, 0, len, dma_mapped,
520 page, pbc, dma_addr);
521
522 if (nfrags) {
523 ret = ipath_user_sdma_init_payload(dd, pq, pkt,
524 iov + idx_save + 1,
525 nfrags, npages);
526 if (ret < 0)
527 goto free_pbc_dma;
528 }
529
530 counter++;
531 npkts++;
532
533 list_add_tail(&pkt->list, list);
534 }
535
536 ret = idx;
537 goto done;
538
539free_pbc_dma:
540 if (dma_mapped)
541 dma_unmap_page(&dd->pcidev->dev, dma_addr, len, DMA_TO_DEVICE);
542free_pbc:
543 if (page) {
544 kunmap(page);
545 __free_page(page);
546 } else
547 dma_pool_free(pq->header_cache, pbc, dma_addr);
548free_pkt:
549 kmem_cache_free(pq->pkt_slab, pkt);
550free_list:
551 ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, list);
552done:
553 return ret;
554}
555
556static void ipath_user_sdma_set_complete_counter(struct ipath_user_sdma_queue *pq,
557 u32 c)
558{
559 pq->sent_counter = c;
560}
561
562/* try to clean out queue -- needs pq->lock */
563static int ipath_user_sdma_queue_clean(const struct ipath_devdata *dd,
564 struct ipath_user_sdma_queue *pq)
565{
566 struct list_head free_list;
567 struct ipath_user_sdma_pkt *pkt;
568 struct ipath_user_sdma_pkt *pkt_prev;
569 int ret = 0;
570
571 INIT_LIST_HEAD(&free_list);
572
573 list_for_each_entry_safe(pkt, pkt_prev, &pq->sent, list) {
574 s64 descd = dd->ipath_sdma_descq_removed - pkt->added;
575
576 if (descd < 0)
577 break;
578
579 list_move_tail(&pkt->list, &free_list);
580
581 /* one more packet cleaned */
582 ret++;
583 }
584
585 if (!list_empty(&free_list)) {
586 u32 counter;
587
588 pkt = list_entry(free_list.prev,
589 struct ipath_user_sdma_pkt, list);
590 counter = pkt->counter;
591
592 ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list);
593 ipath_user_sdma_set_complete_counter(pq, counter);
594 }
595
596 return ret;
597}
598
599void ipath_user_sdma_queue_destroy(struct ipath_user_sdma_queue *pq)
600{
601 if (!pq)
602 return;
603
604 kmem_cache_destroy(pq->pkt_slab);
605 dma_pool_destroy(pq->header_cache);
606 kfree(pq);
607}
608
609/* clean descriptor queue, returns > 0 if some elements cleaned */
610static int ipath_user_sdma_hwqueue_clean(struct ipath_devdata *dd)
611{
612 int ret;
613 unsigned long flags;
614
615 spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
616 ret = ipath_sdma_make_progress(dd);
617 spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
618
619 return ret;
620}
621
622/* we're in close, drain packets so that we can cleanup successfully... */
623void ipath_user_sdma_queue_drain(struct ipath_devdata *dd,
624 struct ipath_user_sdma_queue *pq)
625{
626 int i;
627
628 if (!pq)
629 return;
630
631 for (i = 0; i < 100; i++) {
632 mutex_lock(&pq->lock);
633 if (list_empty(&pq->sent)) {
634 mutex_unlock(&pq->lock);
635 break;
636 }
637 ipath_user_sdma_hwqueue_clean(dd);
638 ipath_user_sdma_queue_clean(dd, pq);
639 mutex_unlock(&pq->lock);
640 msleep(10);
641 }
642
643 if (!list_empty(&pq->sent)) {
644 struct list_head free_list;
645
646 printk(KERN_INFO "drain: lists not empty: forcing!\n");
647 INIT_LIST_HEAD(&free_list);
648 mutex_lock(&pq->lock);
649 list_splice_init(&pq->sent, &free_list);
650 ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list);
651 mutex_unlock(&pq->lock);
652 }
653}
654
655static inline __le64 ipath_sdma_make_desc0(struct ipath_devdata *dd,
656 u64 addr, u64 dwlen, u64 dwoffset)
657{
658 return cpu_to_le64(/* SDmaPhyAddr[31:0] */
659 ((addr & 0xfffffffcULL) << 32) |
660 /* SDmaGeneration[1:0] */
661 ((dd->ipath_sdma_generation & 3ULL) << 30) |
662 /* SDmaDwordCount[10:0] */
663 ((dwlen & 0x7ffULL) << 16) |
664 /* SDmaBufOffset[12:2] */
665 (dwoffset & 0x7ffULL));
666}
667
668static inline __le64 ipath_sdma_make_first_desc0(__le64 descq)
669{
670 return descq | __constant_cpu_to_le64(1ULL << 12);
671}
672
673static inline __le64 ipath_sdma_make_last_desc0(__le64 descq)
674{
675 /* last */ /* dma head */
676 return descq | __constant_cpu_to_le64(1ULL << 11 | 1ULL << 13);
677}
678
679static inline __le64 ipath_sdma_make_desc1(u64 addr)
680{
681 /* SDmaPhyAddr[47:32] */
682 return cpu_to_le64(addr >> 32);
683}
684
685static void ipath_user_sdma_send_frag(struct ipath_devdata *dd,
686 struct ipath_user_sdma_pkt *pkt, int idx,
687 unsigned ofs, u16 tail)
688{
689 const u64 addr = (u64) pkt->addr[idx].addr +
690 (u64) pkt->addr[idx].offset;
691 const u64 dwlen = (u64) pkt->addr[idx].length / 4;
692 __le64 *descqp;
693 __le64 descq0;
694
695 descqp = &dd->ipath_sdma_descq[tail].qw[0];
696
697 descq0 = ipath_sdma_make_desc0(dd, addr, dwlen, ofs);
698 if (idx == 0)
699 descq0 = ipath_sdma_make_first_desc0(descq0);
700 if (idx == pkt->naddr - 1)
701 descq0 = ipath_sdma_make_last_desc0(descq0);
702
703 descqp[0] = descq0;
704 descqp[1] = ipath_sdma_make_desc1(addr);
705}
706
707/* pq->lock must be held, get packets on the wire... */
708static int ipath_user_sdma_push_pkts(struct ipath_devdata *dd,
709 struct ipath_user_sdma_queue *pq,
710 struct list_head *pktlist)
711{
712 int ret = 0;
713 unsigned long flags;
714 u16 tail;
715
716 if (list_empty(pktlist))
717 return 0;
718
719 if (unlikely(!(dd->ipath_flags & IPATH_LINKACTIVE)))
720 return -ECOMM;
721
722 spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
723
724 if (unlikely(dd->ipath_sdma_status & IPATH_SDMA_ABORT_MASK)) {
725 ret = -ECOMM;
726 goto unlock;
727 }
728
729 tail = dd->ipath_sdma_descq_tail;
730 while (!list_empty(pktlist)) {
731 struct ipath_user_sdma_pkt *pkt =
732 list_entry(pktlist->next, struct ipath_user_sdma_pkt,
733 list);
734 int i;
735 unsigned ofs = 0;
736 u16 dtail = tail;
737
738 if (pkt->naddr > ipath_sdma_descq_freecnt(dd))
739 goto unlock_check_tail;
740
741 for (i = 0; i < pkt->naddr; i++) {
742 ipath_user_sdma_send_frag(dd, pkt, i, ofs, tail);
743 ofs += pkt->addr[i].length >> 2;
744
745 if (++tail == dd->ipath_sdma_descq_cnt) {
746 tail = 0;
747 ++dd->ipath_sdma_generation;
748 }
749 }
750
751 if ((ofs<<2) > dd->ipath_ibmaxlen) {
752 ipath_dbg("packet size %X > ibmax %X, fail\n",
753 ofs<<2, dd->ipath_ibmaxlen);
754 ret = -EMSGSIZE;
755 goto unlock;
756 }
757
758 /*
759 * if the packet is >= 2KB mtu equivalent, we have to use
760 * the large buffers, and have to mark each descriptor as
761 * part of a large buffer packet.
762 */
763 if (ofs >= IPATH_SMALLBUF_DWORDS) {
764 for (i = 0; i < pkt->naddr; i++) {
765 dd->ipath_sdma_descq[dtail].qw[0] |=
766 __constant_cpu_to_le64(1ULL << 14);
767 if (++dtail == dd->ipath_sdma_descq_cnt)
768 dtail = 0;
769 }
770 }
771
772 dd->ipath_sdma_descq_added += pkt->naddr;
773 pkt->added = dd->ipath_sdma_descq_added;
774 list_move_tail(&pkt->list, &pq->sent);
775 ret++;
776 }
777
778unlock_check_tail:
779 /* advance the tail on the chip if necessary */
780 if (dd->ipath_sdma_descq_tail != tail) {
781 wmb();
782 ipath_write_kreg(dd, dd->ipath_kregs->kr_senddmatail, tail);
783 dd->ipath_sdma_descq_tail = tail;
784 }
785
786unlock:
787 spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
788
789 return ret;
790}
791
792int ipath_user_sdma_writev(struct ipath_devdata *dd,
793 struct ipath_user_sdma_queue *pq,
794 const struct iovec *iov,
795 unsigned long dim)
796{
797 int ret = 0;
798 struct list_head list;
799 int npkts = 0;
800
801 INIT_LIST_HEAD(&list);
802
803 mutex_lock(&pq->lock);
804
805 if (dd->ipath_sdma_descq_added != dd->ipath_sdma_descq_removed) {
806 ipath_user_sdma_hwqueue_clean(dd);
807 ipath_user_sdma_queue_clean(dd, pq);
808 }
809
810 while (dim) {
811 const int mxp = 8;
812
813 down_write(&current->mm->mmap_sem);
814 ret = ipath_user_sdma_queue_pkts(dd, pq, &list, iov, dim, mxp);
815 up_write(&current->mm->mmap_sem);
816
817 if (ret <= 0)
818 goto done_unlock;
819 else {
820 dim -= ret;
821 iov += ret;
822 }
823
824 /* force packets onto the sdma hw queue... */
825 if (!list_empty(&list)) {
826 /*
827 * lazily clean hw queue. the 4 is a guess of about
828 * how many sdma descriptors a packet will take (it
829 * doesn't have to be perfect).
830 */
831 if (ipath_sdma_descq_freecnt(dd) < ret * 4) {
832 ipath_user_sdma_hwqueue_clean(dd);
833 ipath_user_sdma_queue_clean(dd, pq);
834 }
835
836 ret = ipath_user_sdma_push_pkts(dd, pq, &list);
837 if (ret < 0)
838 goto done_unlock;
839 else {
840 npkts += ret;
841 pq->counter += ret;
842
843 if (!list_empty(&list))
844 goto done_unlock;
845 }
846 }
847 }
848
849done_unlock:
850 if (!list_empty(&list))
851 ipath_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &list);
852 mutex_unlock(&pq->lock);
853
854 return (ret < 0) ? ret : npkts;
855}
856
857int ipath_user_sdma_make_progress(struct ipath_devdata *dd,
858 struct ipath_user_sdma_queue *pq)
859{
860 int ret = 0;
861
862 mutex_lock(&pq->lock);
863 ipath_user_sdma_hwqueue_clean(dd);
864 ret = ipath_user_sdma_queue_clean(dd, pq);
865 mutex_unlock(&pq->lock);
866
867 return ret;
868}
869
870u32 ipath_user_sdma_complete_counter(const struct ipath_user_sdma_queue *pq)
871{
872 return pq->sent_counter;
873}
874
875u32 ipath_user_sdma_inflight_counter(struct ipath_user_sdma_queue *pq)
876{
877 return pq->counter;
878}
879
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 14:20:28 -0500