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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / gpu / drm / mga / mga_dma.c
blob1ffdafea27e4c3a1fbb796c334caea17e59ae89d
1 /* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
2 * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com
3 *
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 */
27
28 /**
29 * \file mga_dma.c
30 * DMA support for MGA G200 / G400.
31 *
32 * \author Rickard E. (Rik) Faith <faith@valinux.com>
33 * \author Jeff Hartmann <jhartmann@valinux.com>
34 * \author Keith Whitwell <keith@tungstengraphics.com>
35 * \author Gareth Hughes <gareth@valinux.com>
36 */
37
38 #include <drm/drmP.h>
39 #include <drm/mga_drm.h>
40 #include "mga_drv.h"
41
42 #define MGA_DEFAULT_USEC_TIMEOUT 10000
43 #define MGA_FREELIST_DEBUG 0
44
45 #define MINIMAL_CLEANUP 0
46 #define FULL_CLEANUP 1
47 static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup);
48
49 /* ================================================================
50 * Engine control
51 */
52
53 int mga_do_wait_for_idle(drm_mga_private_t *dev_priv)
54 {
55 u32 status = 0;
56 int i;
57 DRM_DEBUG("\n");
58
59 for (i = 0; i < dev_priv->usec_timeout; i++) {
60 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
61 if (status == MGA_ENDPRDMASTS) {
62 MGA_WRITE8(MGA_CRTC_INDEX, 0);
63 return 0;
64 }
65 DRM_UDELAY(1);
66 }
67
68 #if MGA_DMA_DEBUG
69 DRM_ERROR("failed!\n");
70 DRM_INFO(" status=0x%08x\n", status);
71 #endif
72 return -EBUSY;
73 }
74
75 static int mga_do_dma_reset(drm_mga_private_t *dev_priv)
76 {
77 drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
78 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
79
80 DRM_DEBUG("\n");
81
82 /* The primary DMA stream should look like new right about now.
83 */
84 primary->tail = 0;
85 primary->space = primary->size;
86 primary->last_flush = 0;
87
88 sarea_priv->last_wrap = 0;
89
90 /* FIXME: Reset counters, buffer ages etc...
91 */
92
93 /* FIXME: What else do we need to reinitialize? WARP stuff?
94 */
95
96 return 0;
97 }
98
99 /* ================================================================
100 * Primary DMA stream
101 */
102
103 void mga_do_dma_flush(drm_mga_private_t *dev_priv)
104 {
105 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
106 u32 head, tail;
107 u32 status = 0;
108 int i;
109 DMA_LOCALS;
110 DRM_DEBUG("\n");
111
112 /* We need to wait so that we can do an safe flush */
113 for (i = 0; i < dev_priv->usec_timeout; i++) {
114 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
115 if (status == MGA_ENDPRDMASTS)
116 break;
117 DRM_UDELAY(1);
118 }
119
120 if (primary->tail == primary->last_flush) {
121 DRM_DEBUG(" bailing out...\n");
122 return;
123 }
124
125 tail = primary->tail + dev_priv->primary->offset;
126
127 /* We need to pad the stream between flushes, as the card
128 * actually (partially?) reads the first of these commands.
129 * See page 4-16 in the G400 manual, middle of the page or so.
130 */
131 BEGIN_DMA(1);
132
133 DMA_BLOCK(MGA_DMAPAD, 0x00000000,
134 MGA_DMAPAD, 0x00000000,
135 MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
136
137 ADVANCE_DMA();
138
139 primary->last_flush = primary->tail;
140
141 head = MGA_READ(MGA_PRIMADDRESS);
142
143 if (head <= tail)
144 primary->space = primary->size - primary->tail;
145 else
146 primary->space = head - tail;
147
148 DRM_DEBUG(" head = 0x%06lx\n", (unsigned long)(head - dev_priv->primary->offset));
149 DRM_DEBUG(" tail = 0x%06lx\n", (unsigned long)(tail - dev_priv->primary->offset));
150 DRM_DEBUG(" space = 0x%06x\n", primary->space);
151
152 mga_flush_write_combine();
153 MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
154
155 DRM_DEBUG("done.\n");
156 }
157
158 void mga_do_dma_wrap_start(drm_mga_private_t *dev_priv)
159 {
160 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
161 u32 head, tail;
162 DMA_LOCALS;
163 DRM_DEBUG("\n");
164
165 BEGIN_DMA_WRAP();
166
167 DMA_BLOCK(MGA_DMAPAD, 0x00000000,
168 MGA_DMAPAD, 0x00000000,
169 MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
170
171 ADVANCE_DMA();
172
173 tail = primary->tail + dev_priv->primary->offset;
174
175 primary->tail = 0;
176 primary->last_flush = 0;
177 primary->last_wrap++;
178
179 head = MGA_READ(MGA_PRIMADDRESS);
180
181 if (head == dev_priv->primary->offset)
182 primary->space = primary->size;
183 else
184 primary->space = head - dev_priv->primary->offset;
185
186 DRM_DEBUG(" head = 0x%06lx\n", (unsigned long)(head - dev_priv->primary->offset));
187 DRM_DEBUG(" tail = 0x%06x\n", primary->tail);
188 DRM_DEBUG(" wrap = %d\n", primary->last_wrap);
189 DRM_DEBUG(" space = 0x%06x\n", primary->space);
190
191 mga_flush_write_combine();
192 MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
193
194 set_bit(0, &primary->wrapped);
195 DRM_DEBUG("done.\n");
196 }
197
198 void mga_do_dma_wrap_end(drm_mga_private_t *dev_priv)
199 {
200 drm_mga_primary_buffer_t *primary = &dev_priv->prim;
201 drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
202 u32 head = dev_priv->primary->offset;
203 DRM_DEBUG("\n");
204
205 sarea_priv->last_wrap++;
206 DRM_DEBUG(" wrap = %d\n", sarea_priv->last_wrap);
207
208 mga_flush_write_combine();
209 MGA_WRITE(MGA_PRIMADDRESS, head | MGA_DMA_GENERAL);
210
211 clear_bit(0, &primary->wrapped);
212 DRM_DEBUG("done.\n");
213 }
214
215 /* ================================================================
216 * Freelist management
217 */
218
219 #define MGA_BUFFER_USED (~0)
220 #define MGA_BUFFER_FREE 0
221
222 #if MGA_FREELIST_DEBUG
223 static void mga_freelist_print(struct drm_device *dev)
224 {
225 drm_mga_private_t *dev_priv = dev->dev_private;
226 drm_mga_freelist_t *entry;
227
228 DRM_INFO("\n");
229 DRM_INFO("current dispatch: last=0x%x done=0x%x\n",
230 dev_priv->sarea_priv->last_dispatch,
231 (unsigned int)(MGA_READ(MGA_PRIMADDRESS) -
232 dev_priv->primary->offset));
233 DRM_INFO("current freelist:\n");
234
235 for (entry = dev_priv->head->next; entry; entry = entry->next) {
236 DRM_INFO(" %p idx=%2d age=0x%x 0x%06lx\n",
237 entry, entry->buf->idx, entry->age.head,
238 (unsigned long)(entry->age.head - dev_priv->primary->offset));
239 }
240 DRM_INFO("\n");
241 }
242 #endif
243
244 static int mga_freelist_init(struct drm_device *dev, drm_mga_private_t *dev_priv)
245 {
246 struct drm_device_dma *dma = dev->dma;
247 struct drm_buf *buf;
248 drm_mga_buf_priv_t *buf_priv;
249 drm_mga_freelist_t *entry;
250 int i;
251 DRM_DEBUG("count=%d\n", dma->buf_count);
252
253 dev_priv->head = kzalloc(sizeof(drm_mga_freelist_t), GFP_KERNEL);
254 if (dev_priv->head == NULL)
255 return -ENOMEM;
256
257 SET_AGE(&dev_priv->head->age, MGA_BUFFER_USED, 0);
258
259 for (i = 0; i < dma->buf_count; i++) {
260 buf = dma->buflist[i];
261 buf_priv = buf->dev_private;
262
263 entry = kzalloc(sizeof(drm_mga_freelist_t), GFP_KERNEL);
264 if (entry == NULL)
265 return -ENOMEM;
266
267 entry->next = dev_priv->head->next;
268 entry->prev = dev_priv->head;
269 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
270 entry->buf = buf;
271
272 if (dev_priv->head->next != NULL)
273 dev_priv->head->next->prev = entry;
274 if (entry->next == NULL)
275 dev_priv->tail = entry;
276
277 buf_priv->list_entry = entry;
278 buf_priv->discard = 0;
279 buf_priv->dispatched = 0;
280
281 dev_priv->head->next = entry;
282 }
283
284 return 0;
285 }
286
287 static void mga_freelist_cleanup(struct drm_device *dev)
288 {
289 drm_mga_private_t *dev_priv = dev->dev_private;
290 drm_mga_freelist_t *entry;
291 drm_mga_freelist_t *next;
292 DRM_DEBUG("\n");
293
294 entry = dev_priv->head;
295 while (entry) {
296 next = entry->next;
297 kfree(entry);
298 entry = next;
299 }
300
301 dev_priv->head = dev_priv->tail = NULL;
302 }
303
304 #if 0
305 /* FIXME: Still needed?
306 */
307 static void mga_freelist_reset(struct drm_device *dev)
308 {
309 struct drm_device_dma *dma = dev->dma;
310 struct drm_buf *buf;
311 drm_mga_buf_priv_t *buf_priv;
312 int i;
313
314 for (i = 0; i < dma->buf_count; i++) {
315 buf = dma->buflist[i];
316 buf_priv = buf->dev_private;
317 SET_AGE(&buf_priv->list_entry->age, MGA_BUFFER_FREE, 0);
318 }
319 }
320 #endif
321
322 static struct drm_buf *mga_freelist_get(struct drm_device * dev)
323 {
324 drm_mga_private_t *dev_priv = dev->dev_private;
325 drm_mga_freelist_t *next;
326 drm_mga_freelist_t *prev;
327 drm_mga_freelist_t *tail = dev_priv->tail;
328 u32 head, wrap;
329 DRM_DEBUG("\n");
330
331 head = MGA_READ(MGA_PRIMADDRESS);
332 wrap = dev_priv->sarea_priv->last_wrap;
333
334 DRM_DEBUG(" tail=0x%06lx %d\n",
335 tail->age.head ?
336 (unsigned long)(tail->age.head - dev_priv->primary->offset) : 0,
337 tail->age.wrap);
338 DRM_DEBUG(" head=0x%06lx %d\n",
339 (unsigned long)(head - dev_priv->primary->offset), wrap);
340
341 if (TEST_AGE(&tail->age, head, wrap)) {
342 prev = dev_priv->tail->prev;
343 next = dev_priv->tail;
344 prev->next = NULL;
345 next->prev = next->next = NULL;
346 dev_priv->tail = prev;
347 SET_AGE(&next->age, MGA_BUFFER_USED, 0);
348 return next->buf;
349 }
350
351 DRM_DEBUG("returning NULL!\n");
352 return NULL;
353 }
354
355 int mga_freelist_put(struct drm_device *dev, struct drm_buf *buf)
356 {
357 drm_mga_private_t *dev_priv = dev->dev_private;
358 drm_mga_buf_priv_t *buf_priv = buf->dev_private;
359 drm_mga_freelist_t *head, *entry, *prev;
360
361 DRM_DEBUG("age=0x%06lx wrap=%d\n",
362 (unsigned long)(buf_priv->list_entry->age.head -
363 dev_priv->primary->offset),
364 buf_priv->list_entry->age.wrap);
365
366 entry = buf_priv->list_entry;
367 head = dev_priv->head;
368
369 if (buf_priv->list_entry->age.head == MGA_BUFFER_USED) {
370 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
371 prev = dev_priv->tail;
372 prev->next = entry;
373 entry->prev = prev;
374 entry->next = NULL;
375 } else {
376 prev = head->next;
377 head->next = entry;
378 prev->prev = entry;
379 entry->prev = head;
380 entry->next = prev;
381 }
382
383 return 0;
384 }
385
386 /* ================================================================
387 * DMA initialization, cleanup
388 */
389
390 int mga_driver_load(struct drm_device *dev, unsigned long flags)
391 {
392 drm_mga_private_t *dev_priv;
393 int ret;
394
395 /* There are PCI versions of the G450. These cards have the
396 * same PCI ID as the AGP G450, but have an additional PCI-to-PCI
397 * bridge chip. We detect these cards, which are not currently
398 * supported by this driver, by looking at the device ID of the
399 * bus the "card" is on. If vendor is 0x3388 (Hint Corp) and the
400 * device is 0x0021 (HB6 Universal PCI-PCI bridge), we reject the
401 * device.
402 */
403 if ((dev->pdev->device == 0x0525) && dev->pdev->bus->self
404 && (dev->pdev->bus->self->vendor == 0x3388)
405 && (dev->pdev->bus->self->device == 0x0021)
406 && dev->agp) {
407 /* FIXME: This should be quirked in the pci core, but oh well
408 * the hw probably stopped existing. */
409 arch_phys_wc_del(dev->agp->agp_mtrr);
410 kfree(dev->agp);
411 dev->agp = NULL;
412 }
413 dev_priv = kzalloc(sizeof(drm_mga_private_t), GFP_KERNEL);
414 if (!dev_priv)
415 return -ENOMEM;
416
417 dev->dev_private = (void *)dev_priv;
418
419 dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
420 dev_priv->chipset = flags;
421
422 pci_set_master(dev->pdev);
423
424 dev_priv->mmio_base = pci_resource_start(dev->pdev, 1);
425 dev_priv->mmio_size = pci_resource_len(dev->pdev, 1);
426
427 ret = drm_vblank_init(dev, 1);
428
429 if (ret) {
430 (void) mga_driver_unload(dev);
431 return ret;
432 }
433
434 return 0;
435 }
436
437 #if IS_ENABLED(CONFIG_AGP)
438 /**
439 * Bootstrap the driver for AGP DMA.
440 *
441 * \todo
442 * Investigate whether there is any benefit to storing the WARP microcode in
443 * AGP memory. If not, the microcode may as well always be put in PCI
444 * memory.
445 *
446 * \todo
447 * This routine needs to set dma_bs->agp_mode to the mode actually configured
448 * in the hardware. Looking just at the Linux AGP driver code, I don't see
449 * an easy way to determine this.
450 *
451 * \sa mga_do_dma_bootstrap, mga_do_pci_dma_bootstrap
452 */
453 static int mga_do_agp_dma_bootstrap(struct drm_device *dev,
454 drm_mga_dma_bootstrap_t *dma_bs)
455 {
456 drm_mga_private_t *const dev_priv =
457 (drm_mga_private_t *) dev->dev_private;
458 unsigned int warp_size = MGA_WARP_UCODE_SIZE;
459 int err;
460 unsigned offset;
461 const unsigned secondary_size = dma_bs->secondary_bin_count
462 * dma_bs->secondary_bin_size;
463 const unsigned agp_size = (dma_bs->agp_size << 20);
464 struct drm_buf_desc req;
465 struct drm_agp_mode mode;
466 struct drm_agp_info info;
467 struct drm_agp_buffer agp_req;
468 struct drm_agp_binding bind_req;
469
470 /* Acquire AGP. */
471 err = drm_agp_acquire(dev);
472 if (err) {
473 DRM_ERROR("Unable to acquire AGP: %d\n", err);
474 return err;
475 }
476
477 err = drm_agp_info(dev, &info);
478 if (err) {
479 DRM_ERROR("Unable to get AGP info: %d\n", err);
480 return err;
481 }
482
483 mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
484 err = drm_agp_enable(dev, mode);
485 if (err) {
486 DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
487 return err;
488 }
489
490 /* In addition to the usual AGP mode configuration, the G200 AGP cards
491 * need to have the AGP mode "manually" set.
492 */
493
494 if (dev_priv->chipset == MGA_CARD_TYPE_G200) {
495 if (mode.mode & 0x02)
496 MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_ENABLE);
497 else
498 MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_DISABLE);
499 }
500
501 /* Allocate and bind AGP memory. */
502 agp_req.size = agp_size;
503 agp_req.type = 0;
504 err = drm_agp_alloc(dev, &agp_req);
505 if (err) {
506 dev_priv->agp_size = 0;
507 DRM_ERROR("Unable to allocate %uMB AGP memory\n",
508 dma_bs->agp_size);
509 return err;
510 }
511
512 dev_priv->agp_size = agp_size;
513 dev_priv->agp_handle = agp_req.handle;
514
515 bind_req.handle = agp_req.handle;
516 bind_req.offset = 0;
517 err = drm_agp_bind(dev, &bind_req);
518 if (err) {
519 DRM_ERROR("Unable to bind AGP memory: %d\n", err);
520 return err;
521 }
522
523 /* Make drm_legacy_addbufs happy by not trying to create a mapping for
524 * less than a page.
525 */
526 if (warp_size < PAGE_SIZE)
527 warp_size = PAGE_SIZE;
528
529 offset = 0;
530 err = drm_legacy_addmap(dev, offset, warp_size,
531 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->warp);
532 if (err) {
533 DRM_ERROR("Unable to map WARP microcode: %d\n", err);
534 return err;
535 }
536
537 offset += warp_size;
538 err = drm_legacy_addmap(dev, offset, dma_bs->primary_size,
539 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->primary);
540 if (err) {
541 DRM_ERROR("Unable to map primary DMA region: %d\n", err);
542 return err;
543 }
544
545 offset += dma_bs->primary_size;
546 err = drm_legacy_addmap(dev, offset, secondary_size,
547 _DRM_AGP, 0, &dev->agp_buffer_map);
548 if (err) {
549 DRM_ERROR("Unable to map secondary DMA region: %d\n", err);
550 return err;
551 }
552
553 (void)memset(&req, 0, sizeof(req));
554 req.count = dma_bs->secondary_bin_count;
555 req.size = dma_bs->secondary_bin_size;
556 req.flags = _DRM_AGP_BUFFER;
557 req.agp_start = offset;
558
559 err = drm_legacy_addbufs_agp(dev, &req);
560 if (err) {
561 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
562 return err;
563 }
564
565 {
566 struct drm_map_list *_entry;
567 unsigned long agp_token = 0;
568
569 list_for_each_entry(_entry, &dev->maplist, head) {
570 if (_entry->map == dev->agp_buffer_map)
571 agp_token = _entry->user_token;
572 }
573 if (!agp_token)
574 return -EFAULT;
575
576 dev->agp_buffer_token = agp_token;
577 }
578
579 offset += secondary_size;
580 err = drm_legacy_addmap(dev, offset, agp_size - offset,
581 _DRM_AGP, 0, &dev_priv->agp_textures);
582 if (err) {
583 DRM_ERROR("Unable to map AGP texture region %d\n", err);
584 return err;
585 }
586
587 drm_legacy_ioremap(dev_priv->warp, dev);
588 drm_legacy_ioremap(dev_priv->primary, dev);
589 drm_legacy_ioremap(dev->agp_buffer_map, dev);
590
591 if (!dev_priv->warp->handle ||
592 !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
593 DRM_ERROR("failed to ioremap agp regions! (%p, %p, %p)\n",
594 dev_priv->warp->handle, dev_priv->primary->handle,
595 dev->agp_buffer_map->handle);
596 return -ENOMEM;
597 }
598
599 dev_priv->dma_access = MGA_PAGPXFER;
600 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
601
602 DRM_INFO("Initialized card for AGP DMA.\n");
603 return 0;
604 }
605 #else
606 static int mga_do_agp_dma_bootstrap(struct drm_device *dev,
607 drm_mga_dma_bootstrap_t *dma_bs)
608 {
609 return -EINVAL;
610 }
611 #endif
612
613 /**
614 * Bootstrap the driver for PCI DMA.
615 *
616 * \todo
617 * The algorithm for decreasing the size of the primary DMA buffer could be
618 * better. The size should be rounded up to the nearest page size, then
619 * decrease the request size by a single page each pass through the loop.
620 *
621 * \todo
622 * Determine whether the maximum address passed to drm_pci_alloc is correct.
623 * The same goes for drm_legacy_addbufs_pci.
624 *
625 * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
626 */
627 static int mga_do_pci_dma_bootstrap(struct drm_device *dev,
628 drm_mga_dma_bootstrap_t *dma_bs)
629 {
630 drm_mga_private_t *const dev_priv =
631 (drm_mga_private_t *) dev->dev_private;
632 unsigned int warp_size = MGA_WARP_UCODE_SIZE;
633 unsigned int primary_size;
634 unsigned int bin_count;
635 int err;
636 struct drm_buf_desc req;
637
638 if (dev->dma == NULL) {
639 DRM_ERROR("dev->dma is NULL\n");
640 return -EFAULT;
641 }
642
643 /* Make drm_legacy_addbufs happy by not trying to create a mapping for
644 * less than a page.
645 */
646 if (warp_size < PAGE_SIZE)
647 warp_size = PAGE_SIZE;
648
649 /* The proper alignment is 0x100 for this mapping */
650 err = drm_legacy_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
651 _DRM_READ_ONLY, &dev_priv->warp);
652 if (err != 0) {
653 DRM_ERROR("Unable to create mapping for WARP microcode: %d\n",
654 err);
655 return err;
656 }
657
658 /* Other than the bottom two bits being used to encode other
659 * information, there don't appear to be any restrictions on the
660 * alignment of the primary or secondary DMA buffers.
661 */
662
663 for (primary_size = dma_bs->primary_size; primary_size != 0;
664 primary_size >>= 1) {
665 /* The proper alignment for this mapping is 0x04 */
666 err = drm_legacy_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
667 _DRM_READ_ONLY, &dev_priv->primary);
668 if (!err)
669 break;
670 }
671
672 if (err != 0) {
673 DRM_ERROR("Unable to allocate primary DMA region: %d\n", err);
674 return -ENOMEM;
675 }
676
677 if (dev_priv->primary->size != dma_bs->primary_size) {
678 DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
679 dma_bs->primary_size,
680 (unsigned)dev_priv->primary->size);
681 dma_bs->primary_size = dev_priv->primary->size;
682 }
683
684 for (bin_count = dma_bs->secondary_bin_count; bin_count > 0;
685 bin_count--) {
686 (void)memset(&req, 0, sizeof(req));
687 req.count = bin_count;
688 req.size = dma_bs->secondary_bin_size;
689
690 err = drm_legacy_addbufs_pci(dev, &req);
691 if (!err)
692 break;
693 }
694
695 if (bin_count == 0) {
696 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
697 return err;
698 }
699
700 if (bin_count != dma_bs->secondary_bin_count) {
701 DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
702 "to %u.\n", dma_bs->secondary_bin_count, bin_count);
703
704 dma_bs->secondary_bin_count = bin_count;
705 }
706
707 dev_priv->dma_access = 0;
708 dev_priv->wagp_enable = 0;
709
710 dma_bs->agp_mode = 0;
711
712 DRM_INFO("Initialized card for PCI DMA.\n");
713 return 0;
714 }
715
716 static int mga_do_dma_bootstrap(struct drm_device *dev,
717 drm_mga_dma_bootstrap_t *dma_bs)
718 {
719 const int is_agp = (dma_bs->agp_mode != 0) && dev->agp;
720 int err;
721 drm_mga_private_t *const dev_priv =
722 (drm_mga_private_t *) dev->dev_private;
723
724 dev_priv->used_new_dma_init = 1;
725
726 /* The first steps are the same for both PCI and AGP based DMA. Map
727 * the cards MMIO registers and map a status page.
728 */
729 err = drm_legacy_addmap(dev, dev_priv->mmio_base, dev_priv->mmio_size,
730 _DRM_REGISTERS, _DRM_READ_ONLY,
731 &dev_priv->mmio);
732 if (err) {
733 DRM_ERROR("Unable to map MMIO region: %d\n", err);
734 return err;
735 }
736
737 err = drm_legacy_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
738 _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
739 &dev_priv->status);
740 if (err) {
741 DRM_ERROR("Unable to map status region: %d\n", err);
742 return err;
743 }
744
745 /* The DMA initialization procedure is slightly different for PCI and
746 * AGP cards. AGP cards just allocate a large block of AGP memory and
747 * carve off portions of it for internal uses. The remaining memory
748 * is returned to user-mode to be used for AGP textures.
749 */
750 if (is_agp)
751 err = mga_do_agp_dma_bootstrap(dev, dma_bs);
752
753 /* If we attempted to initialize the card for AGP DMA but failed,
754 * clean-up any mess that may have been created.
755 */
756
757 if (err)
758 mga_do_cleanup_dma(dev, MINIMAL_CLEANUP);
759
760 /* Not only do we want to try and initialized PCI cards for PCI DMA,
761 * but we also try to initialized AGP cards that could not be
762 * initialized for AGP DMA. This covers the case where we have an AGP
763 * card in a system with an unsupported AGP chipset. In that case the
764 * card will be detected as AGP, but we won't be able to allocate any
765 * AGP memory, etc.
766 */
767
768 if (!is_agp || err)
769 err = mga_do_pci_dma_bootstrap(dev, dma_bs);
770
771 return err;
772 }
773
774 int mga_dma_bootstrap(struct drm_device *dev, void *data,
775 struct drm_file *file_priv)
776 {
777 drm_mga_dma_bootstrap_t *bootstrap = data;
778 int err;
779 static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
780 const drm_mga_private_t *const dev_priv =
781 (drm_mga_private_t *) dev->dev_private;
782
783 err = mga_do_dma_bootstrap(dev, bootstrap);
784 if (err) {
785 mga_do_cleanup_dma(dev, FULL_CLEANUP);
786 return err;
787 }
788
789 if (dev_priv->agp_textures != NULL) {
790 bootstrap->texture_handle = dev_priv->agp_textures->offset;
791 bootstrap->texture_size = dev_priv->agp_textures->size;
792 } else {
793 bootstrap->texture_handle = 0;
794 bootstrap->texture_size = 0;
795 }
796
797 bootstrap->agp_mode = modes[bootstrap->agp_mode & 0x07];
798
799 return err;
800 }
801
802 static int mga_do_init_dma(struct drm_device *dev, drm_mga_init_t *init)
803 {
804 drm_mga_private_t *dev_priv;
805 int ret;
806 DRM_DEBUG("\n");
807
808 dev_priv = dev->dev_private;
809
810 if (init->sgram)
811 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
812 else
813 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
814 dev_priv->maccess = init->maccess;
815
816 dev_priv->fb_cpp = init->fb_cpp;
817 dev_priv->front_offset = init->front_offset;
818 dev_priv->front_pitch = init->front_pitch;
819 dev_priv->back_offset = init->back_offset;
820 dev_priv->back_pitch = init->back_pitch;
821
822 dev_priv->depth_cpp = init->depth_cpp;
823 dev_priv->depth_offset = init->depth_offset;
824 dev_priv->depth_pitch = init->depth_pitch;
825
826 /* FIXME: Need to support AGP textures...
827 */
828 dev_priv->texture_offset = init->texture_offset[0];
829 dev_priv->texture_size = init->texture_size[0];
830
831 dev_priv->sarea = drm_legacy_getsarea(dev);
832 if (!dev_priv->sarea) {
833 DRM_ERROR("failed to find sarea!\n");
834 return -EINVAL;
835 }
836
837 if (!dev_priv->used_new_dma_init) {
838
839 dev_priv->dma_access = MGA_PAGPXFER;
840 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
841
842 dev_priv->status = drm_legacy_findmap(dev, init->status_offset);
843 if (!dev_priv->status) {
844 DRM_ERROR("failed to find status page!\n");
845 return -EINVAL;
846 }
847 dev_priv->mmio = drm_legacy_findmap(dev, init->mmio_offset);
848 if (!dev_priv->mmio) {
849 DRM_ERROR("failed to find mmio region!\n");
850 return -EINVAL;
851 }
852 dev_priv->warp = drm_legacy_findmap(dev, init->warp_offset);
853 if (!dev_priv->warp) {
854 DRM_ERROR("failed to find warp microcode region!\n");
855 return -EINVAL;
856 }
857 dev_priv->primary = drm_legacy_findmap(dev, init->primary_offset);
858 if (!dev_priv->primary) {
859 DRM_ERROR("failed to find primary dma region!\n");
860 return -EINVAL;
861 }
862 dev->agp_buffer_token = init->buffers_offset;
863 dev->agp_buffer_map =
864 drm_legacy_findmap(dev, init->buffers_offset);
865 if (!dev->agp_buffer_map) {
866 DRM_ERROR("failed to find dma buffer region!\n");
867 return -EINVAL;
868 }
869
870 drm_legacy_ioremap(dev_priv->warp, dev);
871 drm_legacy_ioremap(dev_priv->primary, dev);
872 drm_legacy_ioremap(dev->agp_buffer_map, dev);
873 }
874
875 dev_priv->sarea_priv =
876 (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
877 init->sarea_priv_offset);
878
879 if (!dev_priv->warp->handle ||
880 !dev_priv->primary->handle ||
881 ((dev_priv->dma_access != 0) &&
882 ((dev->agp_buffer_map == NULL) ||
883 (dev->agp_buffer_map->handle == NULL)))) {
884 DRM_ERROR("failed to ioremap agp regions!\n");
885 return -ENOMEM;
886 }
887
888 ret = mga_warp_install_microcode(dev_priv);
889 if (ret < 0) {
890 DRM_ERROR("failed to install WARP ucode!: %d\n", ret);
891 return ret;
892 }
893
894 ret = mga_warp_init(dev_priv);
895 if (ret < 0) {
896 DRM_ERROR("failed to init WARP engine!: %d\n", ret);
897 return ret;
898 }
899
900 dev_priv->prim.status = (u32 *) dev_priv->status->handle;
901
902 mga_do_wait_for_idle(dev_priv);
903
904 /* Init the primary DMA registers.
905 */
906 MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
907 #if 0
908 MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 | /* Soft trap, SECEND, SETUPEND */
909 MGA_PRIMPTREN1); /* DWGSYNC */
910 #endif
911
912 dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
913 dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
914 + dev_priv->primary->size);
915 dev_priv->prim.size = dev_priv->primary->size;
916
917 dev_priv->prim.tail = 0;
918 dev_priv->prim.space = dev_priv->prim.size;
919 dev_priv->prim.wrapped = 0;
920
921 dev_priv->prim.last_flush = 0;
922 dev_priv->prim.last_wrap = 0;
923
924 dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
925
926 dev_priv->prim.status[0] = dev_priv->primary->offset;
927 dev_priv->prim.status[1] = 0;
928
929 dev_priv->sarea_priv->last_wrap = 0;
930 dev_priv->sarea_priv->last_frame.head = 0;
931 dev_priv->sarea_priv->last_frame.wrap = 0;
932
933 if (mga_freelist_init(dev, dev_priv) < 0) {
934 DRM_ERROR("could not initialize freelist\n");
935 return -ENOMEM;
936 }
937
938 return 0;
939 }
940
941 static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup)
942 {
943 int err = 0;
944 DRM_DEBUG("\n");
945
946 /* Make sure interrupts are disabled here because the uninstall ioctl
947 * may not have been called from userspace and after dev_private
948 * is freed, it's too late.
949 */
950 if (dev->irq_enabled)
951 drm_irq_uninstall(dev);
952
953 if (dev->dev_private) {
954 drm_mga_private_t *dev_priv = dev->dev_private;
955
956 if ((dev_priv->warp != NULL)
957 && (dev_priv->warp->type != _DRM_CONSISTENT))
958 drm_legacy_ioremapfree(dev_priv->warp, dev);
959
960 if ((dev_priv->primary != NULL)
961 && (dev_priv->primary->type != _DRM_CONSISTENT))
962 drm_legacy_ioremapfree(dev_priv->primary, dev);
963
964 if (dev->agp_buffer_map != NULL)
965 drm_legacy_ioremapfree(dev->agp_buffer_map, dev);
966
967 if (dev_priv->used_new_dma_init) {
968 #if IS_ENABLED(CONFIG_AGP)
969 if (dev_priv->agp_handle != 0) {
970 struct drm_agp_binding unbind_req;
971 struct drm_agp_buffer free_req;
972
973 unbind_req.handle = dev_priv->agp_handle;
974 drm_agp_unbind(dev, &unbind_req);
975
976 free_req.handle = dev_priv->agp_handle;
977 drm_agp_free(dev, &free_req);
978
979 dev_priv->agp_textures = NULL;
980 dev_priv->agp_size = 0;
981 dev_priv->agp_handle = 0;
982 }
983
984 if ((dev->agp != NULL) && dev->agp->acquired)
985 err = drm_agp_release(dev);
986 #endif
987 }
988
989 dev_priv->warp = NULL;
990 dev_priv->primary = NULL;
991 dev_priv->sarea = NULL;
992 dev_priv->sarea_priv = NULL;
993 dev->agp_buffer_map = NULL;
994
995 if (full_cleanup) {
996 dev_priv->mmio = NULL;
997 dev_priv->status = NULL;
998 dev_priv->used_new_dma_init = 0;
999 }
1000
1001 memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
1002 dev_priv->warp_pipe = 0;
1003 memset(dev_priv->warp_pipe_phys, 0,
1004 sizeof(dev_priv->warp_pipe_phys));
1005
1006 if (dev_priv->head != NULL)
1007 mga_freelist_cleanup(dev);
1008 }
1009
1010 return err;
1011 }
1012
1013 int mga_dma_init(struct drm_device *dev, void *data,
1014 struct drm_file *file_priv)
1015 {
1016 drm_mga_init_t *init = data;
1017 int err;
1018
1019 LOCK_TEST_WITH_RETURN(dev, file_priv);
1020
1021 switch (init->func) {
1022 case MGA_INIT_DMA:
1023 err = mga_do_init_dma(dev, init);
1024 if (err)
1025 (void)mga_do_cleanup_dma(dev, FULL_CLEANUP);
1026 return err;
1027 case MGA_CLEANUP_DMA:
1028 return mga_do_cleanup_dma(dev, FULL_CLEANUP);
1029 }
1030
1031 return -EINVAL;
1032 }
1033
1034 /* ================================================================
1035 * Primary DMA stream management
1036 */
1037
1038 int mga_dma_flush(struct drm_device *dev, void *data,
1039 struct drm_file *file_priv)
1040 {
1041 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1042 struct drm_lock *lock = data;
1043
1044 LOCK_TEST_WITH_RETURN(dev, file_priv);
1045
1046 DRM_DEBUG("%s%s%s\n",
1047 (lock->flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
1048 (lock->flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
1049 (lock->flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");
1050
1051 WRAP_WAIT_WITH_RETURN(dev_priv);
1052
1053 if (lock->flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL))
1054 mga_do_dma_flush(dev_priv);
1055
1056 if (lock->flags & _DRM_LOCK_QUIESCENT) {
1057 #if MGA_DMA_DEBUG
1058 int ret = mga_do_wait_for_idle(dev_priv);
1059 if (ret < 0)
1060 DRM_INFO("-EBUSY\n");
1061 return ret;
1062 #else
1063 return mga_do_wait_for_idle(dev_priv);
1064 #endif
1065 } else {
1066 return 0;
1067 }
1068 }
1069
1070 int mga_dma_reset(struct drm_device *dev, void *data,
1071 struct drm_file *file_priv)
1072 {
1073 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1074
1075 LOCK_TEST_WITH_RETURN(dev, file_priv);
1076
1077 return mga_do_dma_reset(dev_priv);
1078 }
1079
1080 /* ================================================================
1081 * DMA buffer management
1082 */
1083
1084 static int mga_dma_get_buffers(struct drm_device *dev,
1085 struct drm_file *file_priv, struct drm_dma *d)
1086 {
1087 struct drm_buf *buf;
1088 int i;
1089
1090 for (i = d->granted_count; i < d->request_count; i++) {
1091 buf = mga_freelist_get(dev);
1092 if (!buf)
1093 return -EAGAIN;
1094
1095 buf->file_priv = file_priv;
1096
1097 if (copy_to_user(&d->request_indices[i],
1098 &buf->idx, sizeof(buf->idx)))
1099 return -EFAULT;
1100 if (copy_to_user(&d->request_sizes[i],
1101 &buf->total, sizeof(buf->total)))
1102 return -EFAULT;
1103
1104 d->granted_count++;
1105 }
1106 return 0;
1107 }
1108
1109 int mga_dma_buffers(struct drm_device *dev, void *data,
1110 struct drm_file *file_priv)
1111 {
1112 struct drm_device_dma *dma = dev->dma;
1113 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1114 struct drm_dma *d = data;
1115 int ret = 0;
1116
1117 LOCK_TEST_WITH_RETURN(dev, file_priv);
1118
1119 /* Please don't send us buffers.
1120 */
1121 if (d->send_count != 0) {
1122 DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
1123 DRM_CURRENTPID, d->send_count);
1124 return -EINVAL;
1125 }
1126
1127 /* We'll send you buffers.
1128 */
1129 if (d->request_count < 0 || d->request_count > dma->buf_count) {
1130 DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
1131 DRM_CURRENTPID, d->request_count, dma->buf_count);
1132 return -EINVAL;
1133 }
1134
1135 WRAP_TEST_WITH_RETURN(dev_priv);
1136
1137 d->granted_count = 0;
1138
1139 if (d->request_count)
1140 ret = mga_dma_get_buffers(dev, file_priv, d);
1141
1142 return ret;
1143 }
1144
1145 /**
1146 * Called just before the module is unloaded.
1147 */
1148 void mga_driver_unload(struct drm_device *dev)
1149 {
1150 kfree(dev->dev_private);
1151 dev->dev_private = NULL;
1152 }
1153
1154 /**
1155 * Called when the last opener of the device is closed.
1156 */
1157 void mga_driver_lastclose(struct drm_device *dev)
1158 {
1159 mga_do_cleanup_dma(dev, FULL_CLEANUP);
1160 }
1161
1162 int mga_driver_dma_quiescent(struct drm_device *dev)
1163 {
1164 drm_mga_private_t *dev_priv = dev->dev_private;
1165 return mga_do_wait_for_idle(dev_priv);
1166 }
CRIS linux kernel tree