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-rw-r--r--drivers/char/drm/via_dmablit.c805
1 files changed, 805 insertions, 0 deletions
diff --git a/drivers/char/drm/via_dmablit.c b/drivers/char/drm/via_dmablit.c
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index 000000000000..9d5e027dae0e
--- /dev/null
+++ b/drivers/char/drm/via_dmablit.c
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1/* via_dmablit.c -- PCI DMA BitBlt support for the VIA Unichrome/Pro
2 *
3 * Copyright (C) 2005 Thomas Hellstrom, All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sub license,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the
13 * next paragraph) shall be included in all copies or substantial portions
14 * of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Thomas Hellstrom.
26 * Partially based on code obtained from Digeo Inc.
27 */
28
29
30/*
31 * Unmaps the DMA mappings.
32 * FIXME: Is this a NoOp on x86? Also
33 * FIXME: What happens if this one is called and a pending blit has previously done
34 * the same DMA mappings?
35 */
36
37#include "drmP.h"
38#include "via_drm.h"
39#include "via_drv.h"
40#include "via_dmablit.h"
41
42#include <linux/pagemap.h>
43
44#define VIA_PGDN(x) (((unsigned long)(x)) & PAGE_MASK)
45#define VIA_PGOFF(x) (((unsigned long)(x)) & ~PAGE_MASK)
46#define VIA_PFN(x) ((unsigned long)(x) >> PAGE_SHIFT)
47
48typedef struct _drm_via_descriptor {
49 uint32_t mem_addr;
50 uint32_t dev_addr;
51 uint32_t size;
52 uint32_t next;
53} drm_via_descriptor_t;
54
55
56/*
57 * Unmap a DMA mapping.
58 */
59
60
61
62static void
63via_unmap_blit_from_device(struct pci_dev *pdev, drm_via_sg_info_t *vsg)
64{
65 int num_desc = vsg->num_desc;
66 unsigned cur_descriptor_page = num_desc / vsg->descriptors_per_page;
67 unsigned descriptor_this_page = num_desc % vsg->descriptors_per_page;
68 drm_via_descriptor_t *desc_ptr = vsg->desc_pages[cur_descriptor_page] +
69 descriptor_this_page;
70 dma_addr_t next = vsg->chain_start;
71
72 while(num_desc--) {
73 if (descriptor_this_page-- == 0) {
74 cur_descriptor_page--;
75 descriptor_this_page = vsg->descriptors_per_page - 1;
76 desc_ptr = vsg->desc_pages[cur_descriptor_page] +
77 descriptor_this_page;
78 }
79 dma_unmap_single(&pdev->dev, next, sizeof(*desc_ptr), DMA_TO_DEVICE);
80 dma_unmap_page(&pdev->dev, desc_ptr->mem_addr, desc_ptr->size, vsg->direction);
81 next = (dma_addr_t) desc_ptr->next;
82 desc_ptr--;
83 }
84}
85
86/*
87 * If mode = 0, count how many descriptors are needed.
88 * If mode = 1, Map the DMA pages for the device, put together and map also the descriptors.
89 * Descriptors are run in reverse order by the hardware because we are not allowed to update the
90 * 'next' field without syncing calls when the descriptor is already mapped.
91 */
92
93static void
94via_map_blit_for_device(struct pci_dev *pdev,
95 const drm_via_dmablit_t *xfer,
96 drm_via_sg_info_t *vsg,
97 int mode)
98{
99 unsigned cur_descriptor_page = 0;
100 unsigned num_descriptors_this_page = 0;
101 unsigned char *mem_addr = xfer->mem_addr;
102 unsigned char *cur_mem;
103 unsigned char *first_addr = (unsigned char *)VIA_PGDN(mem_addr);
104 uint32_t fb_addr = xfer->fb_addr;
105 uint32_t cur_fb;
106 unsigned long line_len;
107 unsigned remaining_len;
108 int num_desc = 0;
109 int cur_line;
110 dma_addr_t next = 0 | VIA_DMA_DPR_EC;
111 drm_via_descriptor_t *desc_ptr = 0;
112
113 if (mode == 1)
114 desc_ptr = vsg->desc_pages[cur_descriptor_page];
115
116 for (cur_line = 0; cur_line < xfer->num_lines; ++cur_line) {
117
118 line_len = xfer->line_length;
119 cur_fb = fb_addr;
120 cur_mem = mem_addr;
121
122 while (line_len > 0) {
123
124 remaining_len = min(PAGE_SIZE-VIA_PGOFF(cur_mem), line_len);
125 line_len -= remaining_len;
126
127 if (mode == 1) {
128 desc_ptr->mem_addr =
129 dma_map_page(&pdev->dev,
130 vsg->pages[VIA_PFN(cur_mem) -
131 VIA_PFN(first_addr)],
132 VIA_PGOFF(cur_mem), remaining_len,
133 vsg->direction);
134 desc_ptr->dev_addr = cur_fb;
135
136 desc_ptr->size = remaining_len;
137 desc_ptr->next = (uint32_t) next;
138 next = dma_map_single(&pdev->dev, desc_ptr, sizeof(*desc_ptr),
139 DMA_TO_DEVICE);
140 desc_ptr++;
141 if (++num_descriptors_this_page >= vsg->descriptors_per_page) {
142 num_descriptors_this_page = 0;
143 desc_ptr = vsg->desc_pages[++cur_descriptor_page];
144 }
145 }
146
147 num_desc++;
148 cur_mem += remaining_len;
149 cur_fb += remaining_len;
150 }
151
152 mem_addr += xfer->mem_stride;
153 fb_addr += xfer->fb_stride;
154 }
155
156 if (mode == 1) {
157 vsg->chain_start = next;
158 vsg->state = dr_via_device_mapped;
159 }
160 vsg->num_desc = num_desc;
161}
162
163/*
164 * Function that frees up all resources for a blit. It is usable even if the
165 * blit info has only be partially built as long as the status enum is consistent
166 * with the actual status of the used resources.
167 */
168
169
170void
171via_free_sg_info(struct pci_dev *pdev, drm_via_sg_info_t *vsg)
172{
173 struct page *page;
174 int i;
175
176 switch(vsg->state) {
177 case dr_via_device_mapped:
178 via_unmap_blit_from_device(pdev, vsg);
179 case dr_via_desc_pages_alloc:
180 for (i=0; i<vsg->num_desc_pages; ++i) {
181 if (vsg->desc_pages[i] != NULL)
182 free_page((unsigned long)vsg->desc_pages[i]);
183 }
184 kfree(vsg->desc_pages);
185 case dr_via_pages_locked:
186 for (i=0; i<vsg->num_pages; ++i) {
187 if ( NULL != (page = vsg->pages[i])) {
188 if (! PageReserved(page) && (DMA_FROM_DEVICE == vsg->direction))
189 SetPageDirty(page);
190 page_cache_release(page);
191 }
192 }
193 case dr_via_pages_alloc:
194 vfree(vsg->pages);
195 default:
196 vsg->state = dr_via_sg_init;
197 }
198 if (vsg->bounce_buffer) {
199 vfree(vsg->bounce_buffer);
200 vsg->bounce_buffer = NULL;
201 }
202 vsg->free_on_sequence = 0;
203}
204
205/*
206 * Fire a blit engine.
207 */
208
209static void
210via_fire_dmablit(drm_device_t *dev, drm_via_sg_info_t *vsg, int engine)
211{
212 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private;
213
214 VIA_WRITE(VIA_PCI_DMA_MAR0 + engine*0x10, 0);
215 VIA_WRITE(VIA_PCI_DMA_DAR0 + engine*0x10, 0);
216 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_DD | VIA_DMA_CSR_TD |
217 VIA_DMA_CSR_DE);
218 VIA_WRITE(VIA_PCI_DMA_MR0 + engine*0x04, VIA_DMA_MR_CM | VIA_DMA_MR_TDIE);
219 VIA_WRITE(VIA_PCI_DMA_BCR0 + engine*0x10, 0);
220 VIA_WRITE(VIA_PCI_DMA_DPR0 + engine*0x10, vsg->chain_start);
221 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_DE | VIA_DMA_CSR_TS);
222}
223
224/*
225 * Obtain a page pointer array and lock all pages into system memory. A segmentation violation will
226 * occur here if the calling user does not have access to the submitted address.
227 */
228
229static int
230via_lock_all_dma_pages(drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer)
231{
232 int ret;
233 unsigned long first_pfn = VIA_PFN(xfer->mem_addr);
234 vsg->num_pages = VIA_PFN(xfer->mem_addr + (xfer->num_lines * xfer->mem_stride -1)) -
235 first_pfn + 1;
236
237 if (NULL == (vsg->pages = vmalloc(sizeof(struct page *) * vsg->num_pages)))
238 return DRM_ERR(ENOMEM);
239 memset(vsg->pages, 0, sizeof(struct page *) * vsg->num_pages);
240 down_read(&current->mm->mmap_sem);
241 ret = get_user_pages(current, current->mm, (unsigned long) xfer->mem_addr,
242 vsg->num_pages, vsg->direction, 0, vsg->pages, NULL);
243
244 up_read(&current->mm->mmap_sem);
245 if (ret != vsg->num_pages) {
246 if (ret < 0)
247 return ret;
248 vsg->state = dr_via_pages_locked;
249 return DRM_ERR(EINVAL);
250 }
251 vsg->state = dr_via_pages_locked;
252 DRM_DEBUG("DMA pages locked\n");
253 return 0;
254}
255
256/*
257 * Allocate DMA capable memory for the blit descriptor chain, and an array that keeps track of the
258 * pages we allocate. We don't want to use kmalloc for the descriptor chain because it may be
259 * quite large for some blits, and pages don't need to be contingous.
260 */
261
262static int
263via_alloc_desc_pages(drm_via_sg_info_t *vsg)
264{
265 int i;
266
267 vsg->descriptors_per_page = PAGE_SIZE / sizeof( drm_via_descriptor_t);
268 vsg->num_desc_pages = (vsg->num_desc + vsg->descriptors_per_page - 1) /
269 vsg->descriptors_per_page;
270
271 if (NULL == (vsg->desc_pages = kmalloc(sizeof(void *) * vsg->num_desc_pages, GFP_KERNEL)))
272 return DRM_ERR(ENOMEM);
273
274 memset(vsg->desc_pages, 0, sizeof(void *) * vsg->num_desc_pages);
275 vsg->state = dr_via_desc_pages_alloc;
276 for (i=0; i<vsg->num_desc_pages; ++i) {
277 if (NULL == (vsg->desc_pages[i] =
278 (drm_via_descriptor_t *) __get_free_page(GFP_KERNEL)))
279 return DRM_ERR(ENOMEM);
280 }
281 DRM_DEBUG("Allocated %d pages for %d descriptors.\n", vsg->num_desc_pages,
282 vsg->num_desc);
283 return 0;
284}
285
286static void
287via_abort_dmablit(drm_device_t *dev, int engine)
288{
289 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private;
290
291 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TA);
292}
293
294static void
295via_dmablit_engine_off(drm_device_t *dev, int engine)
296{
297 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private;
298
299 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TD | VIA_DMA_CSR_DD);
300}
301
302
303
304/*
305 * The dmablit part of the IRQ handler. Trying to do only reasonably fast things here.
306 * The rest, like unmapping and freeing memory for done blits is done in a separate workqueue
307 * task. Basically the task of the interrupt handler is to submit a new blit to the engine, while
308 * the workqueue task takes care of processing associated with the old blit.
309 */
310
311void
312via_dmablit_handler(drm_device_t *dev, int engine, int from_irq)
313{
314 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private;
315 drm_via_blitq_t *blitq = dev_priv->blit_queues + engine;
316 int cur;
317 int done_transfer;
318 unsigned long irqsave=0;
319 uint32_t status = 0;
320
321 DRM_DEBUG("DMA blit handler called. engine = %d, from_irq = %d, blitq = 0x%lx\n",
322 engine, from_irq, (unsigned long) blitq);
323
324 if (from_irq) {
325 spin_lock(&blitq->blit_lock);
326 } else {
327 spin_lock_irqsave(&blitq->blit_lock, irqsave);
328 }
329
330 done_transfer = blitq->is_active &&
331 (( status = VIA_READ(VIA_PCI_DMA_CSR0 + engine*0x04)) & VIA_DMA_CSR_TD);
332 done_transfer = done_transfer || ( blitq->aborting && !(status & VIA_DMA_CSR_DE));
333
334 cur = blitq->cur;
335 if (done_transfer) {
336
337 blitq->blits[cur]->aborted = blitq->aborting;
338 blitq->done_blit_handle++;
339 DRM_WAKEUP(blitq->blit_queue + cur);
340
341 cur++;
342 if (cur >= VIA_NUM_BLIT_SLOTS)
343 cur = 0;
344 blitq->cur = cur;
345
346 /*
347 * Clear transfer done flag.
348 */
349
350 VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_TD);
351
352 blitq->is_active = 0;
353 blitq->aborting = 0;
354 schedule_work(&blitq->wq);
355
356 } else if (blitq->is_active && time_after_eq(jiffies, blitq->end)) {
357
358 /*
359 * Abort transfer after one second.
360 */
361
362 via_abort_dmablit(dev, engine);
363 blitq->aborting = 1;
364 blitq->end = jiffies + DRM_HZ;
365 }
366
367 if (!blitq->is_active) {
368 if (blitq->num_outstanding) {
369 via_fire_dmablit(dev, blitq->blits[cur], engine);
370 blitq->is_active = 1;
371 blitq->cur = cur;
372 blitq->num_outstanding--;
373 blitq->end = jiffies + DRM_HZ;
374 if (!timer_pending(&blitq->poll_timer)) {
375 blitq->poll_timer.expires = jiffies+1;
376 add_timer(&blitq->poll_timer);
377 }
378 } else {
379 if (timer_pending(&blitq->poll_timer)) {
380 del_timer(&blitq->poll_timer);
381 }
382 via_dmablit_engine_off(dev, engine);
383 }
384 }
385
386 if (from_irq) {
387 spin_unlock(&blitq->blit_lock);
388 } else {
389 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
390 }
391}
392
393
394
395/*
396 * Check whether this blit is still active, performing necessary locking.
397 */
398
399static int
400via_dmablit_active(drm_via_blitq_t *blitq, int engine, uint32_t handle, wait_queue_head_t **queue)
401{
402 unsigned long irqsave;
403 uint32_t slot;
404 int active;
405
406 spin_lock_irqsave(&blitq->blit_lock, irqsave);
407
408 /*
409 * Allow for handle wraparounds.
410 */
411
412 active = ((blitq->done_blit_handle - handle) > (1 << 23)) &&
413 ((blitq->cur_blit_handle - handle) <= (1 << 23));
414
415 if (queue && active) {
416 slot = handle - blitq->done_blit_handle + blitq->cur -1;
417 if (slot >= VIA_NUM_BLIT_SLOTS) {
418 slot -= VIA_NUM_BLIT_SLOTS;
419 }
420 *queue = blitq->blit_queue + slot;
421 }
422
423 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
424
425 return active;
426}
427
428/*
429 * Sync. Wait for at least three seconds for the blit to be performed.
430 */
431
432static int
433via_dmablit_sync(drm_device_t *dev, uint32_t handle, int engine)
434{
435
436 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private;
437 drm_via_blitq_t *blitq = dev_priv->blit_queues + engine;
438 wait_queue_head_t *queue;
439 int ret = 0;
440
441 if (via_dmablit_active(blitq, engine, handle, &queue)) {
442 DRM_WAIT_ON(ret, *queue, 3 * DRM_HZ,
443 !via_dmablit_active(blitq, engine, handle, NULL));
444 }
445 DRM_DEBUG("DMA blit sync handle 0x%x engine %d returned %d\n",
446 handle, engine, ret);
447
448 return ret;
449}
450
451
452/*
453 * A timer that regularly polls the blit engine in cases where we don't have interrupts:
454 * a) Broken hardware (typically those that don't have any video capture facility).
455 * b) Blit abort. The hardware doesn't send an interrupt when a blit is aborted.
456 * The timer and hardware IRQ's can and do work in parallel. If the hardware has
457 * irqs, it will shorten the latency somewhat.
458 */
459
460
461
462static void
463via_dmablit_timer(unsigned long data)
464{
465 drm_via_blitq_t *blitq = (drm_via_blitq_t *) data;
466 drm_device_t *dev = blitq->dev;
467 int engine = (int)
468 (blitq - ((drm_via_private_t *)dev->dev_private)->blit_queues);
469
470 DRM_DEBUG("Polling timer called for engine %d, jiffies %lu\n", engine,
471 (unsigned long) jiffies);
472
473 via_dmablit_handler(dev, engine, 0);
474
475 if (!timer_pending(&blitq->poll_timer)) {
476 blitq->poll_timer.expires = jiffies+1;
477 add_timer(&blitq->poll_timer);
478 }
479 via_dmablit_handler(dev, engine, 0);
480
481}
482
483
484
485
486/*
487 * Workqueue task that frees data and mappings associated with a blit.
488 * Also wakes up waiting processes. Each of these tasks handles one
489 * blit engine only and may not be called on each interrupt.
490 */
491
492
493static void
494via_dmablit_workqueue(void *data)
495{
496 drm_via_blitq_t *blitq = (drm_via_blitq_t *) data;
497 drm_device_t *dev = blitq->dev;
498 unsigned long irqsave;
499 drm_via_sg_info_t *cur_sg;
500 int cur_released;
501
502
503 DRM_DEBUG("Workqueue task called for blit engine %ld\n",(unsigned long)
504 (blitq - ((drm_via_private_t *)dev->dev_private)->blit_queues));
505
506 spin_lock_irqsave(&blitq->blit_lock, irqsave);
507
508 while(blitq->serviced != blitq->cur) {
509
510 cur_released = blitq->serviced++;
511
512 DRM_DEBUG("Releasing blit slot %d\n", cur_released);
513
514 if (blitq->serviced >= VIA_NUM_BLIT_SLOTS)
515 blitq->serviced = 0;
516
517 cur_sg = blitq->blits[cur_released];
518 blitq->num_free++;
519
520 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
521
522 DRM_WAKEUP(&blitq->busy_queue);
523
524 via_free_sg_info(dev->pdev, cur_sg);
525 kfree(cur_sg);
526
527 spin_lock_irqsave(&blitq->blit_lock, irqsave);
528 }
529
530 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
531}
532
533
534/*
535 * Init all blit engines. Currently we use two, but some hardware have 4.
536 */
537
538
539void
540via_init_dmablit(drm_device_t *dev)
541{
542 int i,j;
543 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private;
544 drm_via_blitq_t *blitq;
545
546 pci_set_master(dev->pdev);
547
548 for (i=0; i< VIA_NUM_BLIT_ENGINES; ++i) {
549 blitq = dev_priv->blit_queues + i;
550 blitq->dev = dev;
551 blitq->cur_blit_handle = 0;
552 blitq->done_blit_handle = 0;
553 blitq->head = 0;
554 blitq->cur = 0;
555 blitq->serviced = 0;
556 blitq->num_free = VIA_NUM_BLIT_SLOTS;
557 blitq->num_outstanding = 0;
558 blitq->is_active = 0;
559 blitq->aborting = 0;
560 blitq->blit_lock = SPIN_LOCK_UNLOCKED;
561 for (j=0; j<VIA_NUM_BLIT_SLOTS; ++j) {
562 DRM_INIT_WAITQUEUE(blitq->blit_queue + j);
563 }
564 DRM_INIT_WAITQUEUE(&blitq->busy_queue);
565 INIT_WORK(&blitq->wq, via_dmablit_workqueue, blitq);
566 init_timer(&blitq->poll_timer);
567 blitq->poll_timer.function = &via_dmablit_timer;
568 blitq->poll_timer.data = (unsigned long) blitq;
569 }
570}
571
572/*
573 * Build all info and do all mappings required for a blit.
574 */
575
576
577static int
578via_build_sg_info(drm_device_t *dev, drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer)
579{
580 int draw = xfer->to_fb;
581 int ret = 0;
582
583 vsg->direction = (draw) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
584 vsg->bounce_buffer = 0;
585
586 vsg->state = dr_via_sg_init;
587
588 if (xfer->num_lines <= 0 || xfer->line_length <= 0) {
589 DRM_ERROR("Zero size bitblt.\n");
590 return DRM_ERR(EINVAL);
591 }
592
593 /*
594 * Below check is a driver limitation, not a hardware one. We
595 * don't want to lock unused pages, and don't want to incoporate the
596 * extra logic of avoiding them. Make sure there are no.
597 * (Not a big limitation anyway.)
598 */
599
600 if (((xfer->mem_stride - xfer->line_length) >= PAGE_SIZE) ||
601 (xfer->mem_stride > 2048*4)) {
602 DRM_ERROR("Too large system memory stride. Stride: %d, "
603 "Length: %d\n", xfer->mem_stride, xfer->line_length);
604 return DRM_ERR(EINVAL);
605 }
606
607 if (xfer->num_lines > 2048) {
608 DRM_ERROR("Too many PCI DMA bitblt lines.\n");
609 return DRM_ERR(EINVAL);
610 }
611
612 /*
613 * we allow a negative fb stride to allow flipping of images in
614 * transfer.
615 */
616
617 if (xfer->mem_stride < xfer->line_length ||
618 abs(xfer->fb_stride) < xfer->line_length) {
619 DRM_ERROR("Invalid frame-buffer / memory stride.\n");
620 return DRM_ERR(EINVAL);
621 }
622
623 /*
624 * A hardware bug seems to be worked around if system memory addresses start on
625 * 16 byte boundaries. This seems a bit restrictive however. VIA is contacted
626 * about this. Meanwhile, impose the following restrictions:
627 */
628
629#ifdef VIA_BUGFREE
630 if ((((unsigned long)xfer->mem_addr & 3) != ((unsigned long)xfer->fb_addr & 3)) ||
631 ((xfer->mem_stride & 3) != (xfer->fb_stride & 3))) {
632 DRM_ERROR("Invalid DRM bitblt alignment.\n");
633 return DRM_ERR(EINVAL);
634 }
635#else
636 if ((((unsigned long)xfer->mem_addr & 15) ||
637 ((unsigned long)xfer->fb_addr & 3)) || (xfer->mem_stride & 15) ||
638 (xfer->fb_stride & 3)) {
639 DRM_ERROR("Invalid DRM bitblt alignment.\n");
640 return DRM_ERR(EINVAL);
641 }
642#endif
643
644 if (0 != (ret = via_lock_all_dma_pages(vsg, xfer))) {
645 DRM_ERROR("Could not lock DMA pages.\n");
646 via_free_sg_info(dev->pdev, vsg);
647 return ret;
648 }
649
650 via_map_blit_for_device(dev->pdev, xfer, vsg, 0);
651 if (0 != (ret = via_alloc_desc_pages(vsg))) {
652 DRM_ERROR("Could not allocate DMA descriptor pages.\n");
653 via_free_sg_info(dev->pdev, vsg);
654 return ret;
655 }
656 via_map_blit_for_device(dev->pdev, xfer, vsg, 1);
657
658 return 0;
659}
660
661
662/*
663 * Reserve one free slot in the blit queue. Will wait for one second for one
664 * to become available. Otherwise -EBUSY is returned.
665 */
666
667static int
668via_dmablit_grab_slot(drm_via_blitq_t *blitq, int engine)
669{
670 int ret=0;
671 unsigned long irqsave;
672
673 DRM_DEBUG("Num free is %d\n", blitq->num_free);
674 spin_lock_irqsave(&blitq->blit_lock, irqsave);
675 while(blitq->num_free == 0) {
676 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
677
678 DRM_WAIT_ON(ret, blitq->busy_queue, DRM_HZ, blitq->num_free > 0);
679 if (ret) {
680 return (DRM_ERR(EINTR) == ret) ? DRM_ERR(EAGAIN) : ret;
681 }
682
683 spin_lock_irqsave(&blitq->blit_lock, irqsave);
684 }
685
686 blitq->num_free--;
687 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
688
689 return 0;
690}
691
692/*
693 * Hand back a free slot if we changed our mind.
694 */
695
696static void
697via_dmablit_release_slot(drm_via_blitq_t *blitq)
698{
699 unsigned long irqsave;
700
701 spin_lock_irqsave(&blitq->blit_lock, irqsave);
702 blitq->num_free++;
703 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
704 DRM_WAKEUP( &blitq->busy_queue );
705}
706
707/*
708 * Grab a free slot. Build blit info and queue a blit.
709 */
710
711
712static int
713via_dmablit(drm_device_t *dev, drm_via_dmablit_t *xfer)
714{
715 drm_via_private_t *dev_priv = (drm_via_private_t *)dev->dev_private;
716 drm_via_sg_info_t *vsg;
717 drm_via_blitq_t *blitq;
718 int ret;
719 int engine;
720 unsigned long irqsave;
721
722 if (dev_priv == NULL) {
723 DRM_ERROR("Called without initialization.\n");
724 return DRM_ERR(EINVAL);
725 }
726
727 engine = (xfer->to_fb) ? 0 : 1;
728 blitq = dev_priv->blit_queues + engine;
729 if (0 != (ret = via_dmablit_grab_slot(blitq, engine))) {
730 return ret;
731 }
732 if (NULL == (vsg = kmalloc(sizeof(*vsg), GFP_KERNEL))) {
733 via_dmablit_release_slot(blitq);
734 return DRM_ERR(ENOMEM);
735 }
736 if (0 != (ret = via_build_sg_info(dev, vsg, xfer))) {
737 via_dmablit_release_slot(blitq);
738 kfree(vsg);
739 return ret;
740 }
741 spin_lock_irqsave(&blitq->blit_lock, irqsave);
742
743 blitq->blits[blitq->head++] = vsg;
744 if (blitq->head >= VIA_NUM_BLIT_SLOTS)
745 blitq->head = 0;
746 blitq->num_outstanding++;
747 xfer->sync.sync_handle = ++blitq->cur_blit_handle;
748
749 spin_unlock_irqrestore(&blitq->blit_lock, irqsave);
750 xfer->sync.engine = engine;
751
752 via_dmablit_handler(dev, engine, 0);
753
754 return 0;
755}
756
757/*
758 * Sync on a previously submitted blit. Note that the X server use signals extensively, and
759 * that there is a very big proability that this IOCTL will be interrupted by a signal. In that
760 * case it returns with -EAGAIN for the signal to be delivered.
761 * The caller should then reissue the IOCTL. This is similar to what is being done for drmGetLock().
762 */
763
764int
765via_dma_blit_sync( DRM_IOCTL_ARGS )
766{
767 drm_via_blitsync_t sync;
768 int err;
769 DRM_DEVICE;
770
771 DRM_COPY_FROM_USER_IOCTL(sync, (drm_via_blitsync_t *)data, sizeof(sync));
772
773 if (sync.engine >= VIA_NUM_BLIT_ENGINES)
774 return DRM_ERR(EINVAL);
775
776 err = via_dmablit_sync(dev, sync.sync_handle, sync.engine);
777
778 if (DRM_ERR(EINTR) == err)
779 err = DRM_ERR(EAGAIN);
780
781 return err;
782}
783
784
785/*
786 * Queue a blit and hand back a handle to be used for sync. This IOCTL may be interrupted by a signal
787 * while waiting for a free slot in the blit queue. In that case it returns with -EAGAIN and should
788 * be reissued. See the above IOCTL code.
789 */
790
791int
792via_dma_blit( DRM_IOCTL_ARGS )
793{
794 drm_via_dmablit_t xfer;
795 int err;
796 DRM_DEVICE;
797
798 DRM_COPY_FROM_USER_IOCTL(xfer, (drm_via_dmablit_t __user *)data, sizeof(xfer));
799
800 err = via_dmablit(dev, &xfer);
801
802 DRM_COPY_TO_USER_IOCTL((void __user *)data, xfer, sizeof(xfer));
803
804 return err;
805}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 12:17:50 -0500