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
mga_do_wait_for_idle(drm_mga_private_t * dev_priv)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
mga_do_dma_reset(drm_mga_private_t * dev_priv)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
mga_do_dma_flush(drm_mga_private_t * dev_priv)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
mga_do_dma_wrap_start(drm_mga_private_t * dev_priv)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
mga_do_dma_wrap_end(drm_mga_private_t * dev_priv)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
mga_freelist_print(struct drm_device * dev)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
mga_freelist_init(struct drm_device * dev,drm_mga_private_t * dev_priv)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
mga_freelist_cleanup(struct drm_device * dev)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
mga_freelist_get(struct drm_device * dev)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
mga_freelist_put(struct drm_device * dev,struct drm_buf * buf)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
mga_driver_load(struct drm_device * dev,unsigned long flags)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 dev_priv = kzalloc(sizeof(drm_mga_private_t), GFP_KERNEL);
396 if (!dev_priv)
397 return -ENOMEM;
398
399 dev->dev_private = (void *)dev_priv;
400
401 dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
402 dev_priv->chipset = flags;
403
404 pci_set_master(dev->pdev);
405
406 dev_priv->mmio_base = pci_resource_start(dev->pdev, 1);
407 dev_priv->mmio_size = pci_resource_len(dev->pdev, 1);
408
409 ret = drm_vblank_init(dev, 1);
410
411 if (ret) {
412 (void) mga_driver_unload(dev);
413 return ret;
414 }
415
416 return 0;
417 }
418
419 #if __OS_HAS_AGP
420 /**
421 * Bootstrap the driver for AGP DMA.
422 *
423 * \todo
424 * Investigate whether there is any benefit to storing the WARP microcode in
425 * AGP memory. If not, the microcode may as well always be put in PCI
426 * memory.
427 *
428 * \todo
429 * This routine needs to set dma_bs->agp_mode to the mode actually configured
430 * in the hardware. Looking just at the Linux AGP driver code, I don't see
431 * an easy way to determine this.
432 *
433 * \sa mga_do_dma_bootstrap, mga_do_pci_dma_bootstrap
434 */
mga_do_agp_dma_bootstrap(struct drm_device * dev,drm_mga_dma_bootstrap_t * dma_bs)435 static int mga_do_agp_dma_bootstrap(struct drm_device *dev,
436 drm_mga_dma_bootstrap_t *dma_bs)
437 {
438 drm_mga_private_t *const dev_priv =
439 (drm_mga_private_t *) dev->dev_private;
440 unsigned int warp_size = MGA_WARP_UCODE_SIZE;
441 int err;
442 unsigned offset;
443 const unsigned secondary_size = dma_bs->secondary_bin_count
444 * dma_bs->secondary_bin_size;
445 const unsigned agp_size = (dma_bs->agp_size << 20);
446 struct drm_buf_desc req;
447 struct drm_agp_mode mode;
448 struct drm_agp_info info;
449 struct drm_agp_buffer agp_req;
450 struct drm_agp_binding bind_req;
451
452 /* Acquire AGP. */
453 err = drm_agp_acquire(dev);
454 if (err) {
455 DRM_ERROR("Unable to acquire AGP: %d\n", err);
456 return err;
457 }
458
459 err = drm_agp_info(dev, &info);
460 if (err) {
461 DRM_ERROR("Unable to get AGP info: %d\n", err);
462 return err;
463 }
464
465 mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
466 err = drm_agp_enable(dev, mode);
467 if (err) {
468 DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
469 return err;
470 }
471
472 /* In addition to the usual AGP mode configuration, the G200 AGP cards
473 * need to have the AGP mode "manually" set.
474 */
475
476 if (dev_priv->chipset == MGA_CARD_TYPE_G200) {
477 if (mode.mode & 0x02)
478 MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_ENABLE);
479 else
480 MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_DISABLE);
481 }
482
483 /* Allocate and bind AGP memory. */
484 agp_req.size = agp_size;
485 agp_req.type = 0;
486 err = drm_agp_alloc(dev, &agp_req);
487 if (err) {
488 dev_priv->agp_size = 0;
489 DRM_ERROR("Unable to allocate %uMB AGP memory\n",
490 dma_bs->agp_size);
491 return err;
492 }
493
494 dev_priv->agp_size = agp_size;
495 dev_priv->agp_handle = agp_req.handle;
496
497 bind_req.handle = agp_req.handle;
498 bind_req.offset = 0;
499 err = drm_agp_bind(dev, &bind_req);
500 if (err) {
501 DRM_ERROR("Unable to bind AGP memory: %d\n", err);
502 return err;
503 }
504
505 /* Make drm_legacy_addbufs happy by not trying to create a mapping for
506 * less than a page.
507 */
508 if (warp_size < PAGE_SIZE)
509 warp_size = PAGE_SIZE;
510
511 offset = 0;
512 err = drm_legacy_addmap(dev, offset, warp_size,
513 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->warp);
514 if (err) {
515 DRM_ERROR("Unable to map WARP microcode: %d\n", err);
516 return err;
517 }
518
519 offset += warp_size;
520 err = drm_legacy_addmap(dev, offset, dma_bs->primary_size,
521 _DRM_AGP, _DRM_READ_ONLY, &dev_priv->primary);
522 if (err) {
523 DRM_ERROR("Unable to map primary DMA region: %d\n", err);
524 return err;
525 }
526
527 offset += dma_bs->primary_size;
528 err = drm_legacy_addmap(dev, offset, secondary_size,
529 _DRM_AGP, 0, &dev->agp_buffer_map);
530 if (err) {
531 DRM_ERROR("Unable to map secondary DMA region: %d\n", err);
532 return err;
533 }
534
535 (void)memset(&req, 0, sizeof(req));
536 req.count = dma_bs->secondary_bin_count;
537 req.size = dma_bs->secondary_bin_size;
538 req.flags = _DRM_AGP_BUFFER;
539 req.agp_start = offset;
540
541 err = drm_legacy_addbufs_agp(dev, &req);
542 if (err) {
543 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
544 return err;
545 }
546
547 {
548 struct drm_map_list *_entry;
549 unsigned long agp_token = 0;
550
551 list_for_each_entry(_entry, &dev->maplist, head) {
552 if (_entry->map == dev->agp_buffer_map)
553 agp_token = _entry->user_token;
554 }
555 if (!agp_token)
556 return -EFAULT;
557
558 dev->agp_buffer_token = agp_token;
559 }
560
561 offset += secondary_size;
562 err = drm_legacy_addmap(dev, offset, agp_size - offset,
563 _DRM_AGP, 0, &dev_priv->agp_textures);
564 if (err) {
565 DRM_ERROR("Unable to map AGP texture region %d\n", err);
566 return err;
567 }
568
569 drm_legacy_ioremap(dev_priv->warp, dev);
570 drm_legacy_ioremap(dev_priv->primary, dev);
571 drm_legacy_ioremap(dev->agp_buffer_map, dev);
572
573 if (!dev_priv->warp->handle ||
574 !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
575 DRM_ERROR("failed to ioremap agp regions! (%p, %p, %p)\n",
576 dev_priv->warp->handle, dev_priv->primary->handle,
577 dev->agp_buffer_map->handle);
578 return -ENOMEM;
579 }
580
581 dev_priv->dma_access = MGA_PAGPXFER;
582 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
583
584 DRM_INFO("Initialized card for AGP DMA.\n");
585 return 0;
586 }
587 #else
mga_do_agp_dma_bootstrap(struct drm_device * dev,drm_mga_dma_bootstrap_t * dma_bs)588 static int mga_do_agp_dma_bootstrap(struct drm_device *dev,
589 drm_mga_dma_bootstrap_t *dma_bs)
590 {
591 return -EINVAL;
592 }
593 #endif
594
595 /**
596 * Bootstrap the driver for PCI DMA.
597 *
598 * \todo
599 * The algorithm for decreasing the size of the primary DMA buffer could be
600 * better. The size should be rounded up to the nearest page size, then
601 * decrease the request size by a single page each pass through the loop.
602 *
603 * \todo
604 * Determine whether the maximum address passed to drm_pci_alloc is correct.
605 * The same goes for drm_legacy_addbufs_pci.
606 *
607 * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
608 */
mga_do_pci_dma_bootstrap(struct drm_device * dev,drm_mga_dma_bootstrap_t * dma_bs)609 static int mga_do_pci_dma_bootstrap(struct drm_device *dev,
610 drm_mga_dma_bootstrap_t *dma_bs)
611 {
612 drm_mga_private_t *const dev_priv =
613 (drm_mga_private_t *) dev->dev_private;
614 unsigned int warp_size = MGA_WARP_UCODE_SIZE;
615 unsigned int primary_size;
616 unsigned int bin_count;
617 int err;
618 struct drm_buf_desc req;
619
620 if (dev->dma == NULL) {
621 DRM_ERROR("dev->dma is NULL\n");
622 return -EFAULT;
623 }
624
625 /* Make drm_legacy_addbufs happy by not trying to create a mapping for
626 * less than a page.
627 */
628 if (warp_size < PAGE_SIZE)
629 warp_size = PAGE_SIZE;
630
631 /* The proper alignment is 0x100 for this mapping */
632 err = drm_legacy_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
633 _DRM_READ_ONLY, &dev_priv->warp);
634 if (err != 0) {
635 DRM_ERROR("Unable to create mapping for WARP microcode: %d\n",
636 err);
637 return err;
638 }
639
640 /* Other than the bottom two bits being used to encode other
641 * information, there don't appear to be any restrictions on the
642 * alignment of the primary or secondary DMA buffers.
643 */
644
645 for (primary_size = dma_bs->primary_size; primary_size != 0;
646 primary_size >>= 1) {
647 /* The proper alignment for this mapping is 0x04 */
648 err = drm_legacy_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
649 _DRM_READ_ONLY, &dev_priv->primary);
650 if (!err)
651 break;
652 }
653
654 if (err != 0) {
655 DRM_ERROR("Unable to allocate primary DMA region: %d\n", err);
656 return -ENOMEM;
657 }
658
659 if (dev_priv->primary->size != dma_bs->primary_size) {
660 DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
661 dma_bs->primary_size,
662 (unsigned)dev_priv->primary->size);
663 dma_bs->primary_size = dev_priv->primary->size;
664 }
665
666 for (bin_count = dma_bs->secondary_bin_count; bin_count > 0;
667 bin_count--) {
668 (void)memset(&req, 0, sizeof(req));
669 req.count = bin_count;
670 req.size = dma_bs->secondary_bin_size;
671
672 err = drm_legacy_addbufs_pci(dev, &req);
673 if (!err)
674 break;
675 }
676
677 if (bin_count == 0) {
678 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
679 return err;
680 }
681
682 if (bin_count != dma_bs->secondary_bin_count) {
683 DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
684 "to %u.\n", dma_bs->secondary_bin_count, bin_count);
685
686 dma_bs->secondary_bin_count = bin_count;
687 }
688
689 dev_priv->dma_access = 0;
690 dev_priv->wagp_enable = 0;
691
692 dma_bs->agp_mode = 0;
693
694 DRM_INFO("Initialized card for PCI DMA.\n");
695 return 0;
696 }
697
mga_do_dma_bootstrap(struct drm_device * dev,drm_mga_dma_bootstrap_t * dma_bs)698 static int mga_do_dma_bootstrap(struct drm_device *dev,
699 drm_mga_dma_bootstrap_t *dma_bs)
700 {
701 const int is_agp = (dma_bs->agp_mode != 0) && drm_pci_device_is_agp(dev);
702 int err;
703 drm_mga_private_t *const dev_priv =
704 (drm_mga_private_t *) dev->dev_private;
705
706 dev_priv->used_new_dma_init = 1;
707
708 /* The first steps are the same for both PCI and AGP based DMA. Map
709 * the cards MMIO registers and map a status page.
710 */
711 err = drm_legacy_addmap(dev, dev_priv->mmio_base, dev_priv->mmio_size,
712 _DRM_REGISTERS, _DRM_READ_ONLY,
713 &dev_priv->mmio);
714 if (err) {
715 DRM_ERROR("Unable to map MMIO region: %d\n", err);
716 return err;
717 }
718
719 err = drm_legacy_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
720 _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
721 &dev_priv->status);
722 if (err) {
723 DRM_ERROR("Unable to map status region: %d\n", err);
724 return err;
725 }
726
727 /* The DMA initialization procedure is slightly different for PCI and
728 * AGP cards. AGP cards just allocate a large block of AGP memory and
729 * carve off portions of it for internal uses. The remaining memory
730 * is returned to user-mode to be used for AGP textures.
731 */
732 if (is_agp)
733 err = mga_do_agp_dma_bootstrap(dev, dma_bs);
734
735 /* If we attempted to initialize the card for AGP DMA but failed,
736 * clean-up any mess that may have been created.
737 */
738
739 if (err)
740 mga_do_cleanup_dma(dev, MINIMAL_CLEANUP);
741
742 /* Not only do we want to try and initialized PCI cards for PCI DMA,
743 * but we also try to initialized AGP cards that could not be
744 * initialized for AGP DMA. This covers the case where we have an AGP
745 * card in a system with an unsupported AGP chipset. In that case the
746 * card will be detected as AGP, but we won't be able to allocate any
747 * AGP memory, etc.
748 */
749
750 if (!is_agp || err)
751 err = mga_do_pci_dma_bootstrap(dev, dma_bs);
752
753 return err;
754 }
755
mga_dma_bootstrap(struct drm_device * dev,void * data,struct drm_file * file_priv)756 int mga_dma_bootstrap(struct drm_device *dev, void *data,
757 struct drm_file *file_priv)
758 {
759 drm_mga_dma_bootstrap_t *bootstrap = data;
760 int err;
761 static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
762 const drm_mga_private_t *const dev_priv =
763 (drm_mga_private_t *) dev->dev_private;
764
765 err = mga_do_dma_bootstrap(dev, bootstrap);
766 if (err) {
767 mga_do_cleanup_dma(dev, FULL_CLEANUP);
768 return err;
769 }
770
771 if (dev_priv->agp_textures != NULL) {
772 bootstrap->texture_handle = dev_priv->agp_textures->offset;
773 bootstrap->texture_size = dev_priv->agp_textures->size;
774 } else {
775 bootstrap->texture_handle = 0;
776 bootstrap->texture_size = 0;
777 }
778
779 bootstrap->agp_mode = modes[bootstrap->agp_mode & 0x07];
780
781 return err;
782 }
783
mga_do_init_dma(struct drm_device * dev,drm_mga_init_t * init)784 static int mga_do_init_dma(struct drm_device *dev, drm_mga_init_t *init)
785 {
786 drm_mga_private_t *dev_priv;
787 int ret;
788 DRM_DEBUG("\n");
789
790 dev_priv = dev->dev_private;
791
792 if (init->sgram)
793 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
794 else
795 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
796 dev_priv->maccess = init->maccess;
797
798 dev_priv->fb_cpp = init->fb_cpp;
799 dev_priv->front_offset = init->front_offset;
800 dev_priv->front_pitch = init->front_pitch;
801 dev_priv->back_offset = init->back_offset;
802 dev_priv->back_pitch = init->back_pitch;
803
804 dev_priv->depth_cpp = init->depth_cpp;
805 dev_priv->depth_offset = init->depth_offset;
806 dev_priv->depth_pitch = init->depth_pitch;
807
808 /* FIXME: Need to support AGP textures...
809 */
810 dev_priv->texture_offset = init->texture_offset[0];
811 dev_priv->texture_size = init->texture_size[0];
812
813 dev_priv->sarea = drm_legacy_getsarea(dev);
814 if (!dev_priv->sarea) {
815 DRM_ERROR("failed to find sarea!\n");
816 return -EINVAL;
817 }
818
819 if (!dev_priv->used_new_dma_init) {
820
821 dev_priv->dma_access = MGA_PAGPXFER;
822 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
823
824 dev_priv->status = drm_legacy_findmap(dev, init->status_offset);
825 if (!dev_priv->status) {
826 DRM_ERROR("failed to find status page!\n");
827 return -EINVAL;
828 }
829 dev_priv->mmio = drm_legacy_findmap(dev, init->mmio_offset);
830 if (!dev_priv->mmio) {
831 DRM_ERROR("failed to find mmio region!\n");
832 return -EINVAL;
833 }
834 dev_priv->warp = drm_legacy_findmap(dev, init->warp_offset);
835 if (!dev_priv->warp) {
836 DRM_ERROR("failed to find warp microcode region!\n");
837 return -EINVAL;
838 }
839 dev_priv->primary = drm_legacy_findmap(dev, init->primary_offset);
840 if (!dev_priv->primary) {
841 DRM_ERROR("failed to find primary dma region!\n");
842 return -EINVAL;
843 }
844 dev->agp_buffer_token = init->buffers_offset;
845 dev->agp_buffer_map =
846 drm_legacy_findmap(dev, init->buffers_offset);
847 if (!dev->agp_buffer_map) {
848 DRM_ERROR("failed to find dma buffer region!\n");
849 return -EINVAL;
850 }
851
852 drm_legacy_ioremap(dev_priv->warp, dev);
853 drm_legacy_ioremap(dev_priv->primary, dev);
854 drm_legacy_ioremap(dev->agp_buffer_map, dev);
855 }
856
857 dev_priv->sarea_priv =
858 (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
859 init->sarea_priv_offset);
860
861 if (!dev_priv->warp->handle ||
862 !dev_priv->primary->handle ||
863 ((dev_priv->dma_access != 0) &&
864 ((dev->agp_buffer_map == NULL) ||
865 (dev->agp_buffer_map->handle == NULL)))) {
866 DRM_ERROR("failed to ioremap agp regions!\n");
867 return -ENOMEM;
868 }
869
870 ret = mga_warp_install_microcode(dev_priv);
871 if (ret < 0) {
872 DRM_ERROR("failed to install WARP ucode!: %d\n", ret);
873 return ret;
874 }
875
876 ret = mga_warp_init(dev_priv);
877 if (ret < 0) {
878 DRM_ERROR("failed to init WARP engine!: %d\n", ret);
879 return ret;
880 }
881
882 dev_priv->prim.status = (u32 *) dev_priv->status->handle;
883
884 mga_do_wait_for_idle(dev_priv);
885
886 /* Init the primary DMA registers.
887 */
888 MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
889 #if 0
890 MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 | /* Soft trap, SECEND, SETUPEND */
891 MGA_PRIMPTREN1); /* DWGSYNC */
892 #endif
893
894 dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
895 dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
896 + dev_priv->primary->size);
897 dev_priv->prim.size = dev_priv->primary->size;
898
899 dev_priv->prim.tail = 0;
900 dev_priv->prim.space = dev_priv->prim.size;
901 dev_priv->prim.wrapped = 0;
902
903 dev_priv->prim.last_flush = 0;
904 dev_priv->prim.last_wrap = 0;
905
906 dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
907
908 dev_priv->prim.status[0] = dev_priv->primary->offset;
909 dev_priv->prim.status[1] = 0;
910
911 dev_priv->sarea_priv->last_wrap = 0;
912 dev_priv->sarea_priv->last_frame.head = 0;
913 dev_priv->sarea_priv->last_frame.wrap = 0;
914
915 if (mga_freelist_init(dev, dev_priv) < 0) {
916 DRM_ERROR("could not initialize freelist\n");
917 return -ENOMEM;
918 }
919
920 return 0;
921 }
922
mga_do_cleanup_dma(struct drm_device * dev,int full_cleanup)923 static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup)
924 {
925 int err = 0;
926 DRM_DEBUG("\n");
927
928 /* Make sure interrupts are disabled here because the uninstall ioctl
929 * may not have been called from userspace and after dev_private
930 * is freed, it's too late.
931 */
932 if (dev->irq_enabled)
933 drm_irq_uninstall(dev);
934
935 if (dev->dev_private) {
936 drm_mga_private_t *dev_priv = dev->dev_private;
937
938 if ((dev_priv->warp != NULL)
939 && (dev_priv->warp->type != _DRM_CONSISTENT))
940 drm_legacy_ioremapfree(dev_priv->warp, dev);
941
942 if ((dev_priv->primary != NULL)
943 && (dev_priv->primary->type != _DRM_CONSISTENT))
944 drm_legacy_ioremapfree(dev_priv->primary, dev);
945
946 if (dev->agp_buffer_map != NULL)
947 drm_legacy_ioremapfree(dev->agp_buffer_map, dev);
948
949 if (dev_priv->used_new_dma_init) {
950 #if __OS_HAS_AGP
951 if (dev_priv->agp_handle != 0) {
952 struct drm_agp_binding unbind_req;
953 struct drm_agp_buffer free_req;
954
955 unbind_req.handle = dev_priv->agp_handle;
956 drm_agp_unbind(dev, &unbind_req);
957
958 free_req.handle = dev_priv->agp_handle;
959 drm_agp_free(dev, &free_req);
960
961 dev_priv->agp_textures = NULL;
962 dev_priv->agp_size = 0;
963 dev_priv->agp_handle = 0;
964 }
965
966 if ((dev->agp != NULL) && dev->agp->acquired)
967 err = drm_agp_release(dev);
968 #endif
969 }
970
971 dev_priv->warp = NULL;
972 dev_priv->primary = NULL;
973 dev_priv->sarea = NULL;
974 dev_priv->sarea_priv = NULL;
975 dev->agp_buffer_map = NULL;
976
977 if (full_cleanup) {
978 dev_priv->mmio = NULL;
979 dev_priv->status = NULL;
980 dev_priv->used_new_dma_init = 0;
981 }
982
983 memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
984 dev_priv->warp_pipe = 0;
985 memset(dev_priv->warp_pipe_phys, 0,
986 sizeof(dev_priv->warp_pipe_phys));
987
988 if (dev_priv->head != NULL)
989 mga_freelist_cleanup(dev);
990 }
991
992 return err;
993 }
994
mga_dma_init(struct drm_device * dev,void * data,struct drm_file * file_priv)995 int mga_dma_init(struct drm_device *dev, void *data,
996 struct drm_file *file_priv)
997 {
998 drm_mga_init_t *init = data;
999 int err;
1000
1001 LOCK_TEST_WITH_RETURN(dev, file_priv);
1002
1003 switch (init->func) {
1004 case MGA_INIT_DMA:
1005 err = mga_do_init_dma(dev, init);
1006 if (err)
1007 (void)mga_do_cleanup_dma(dev, FULL_CLEANUP);
1008 return err;
1009 case MGA_CLEANUP_DMA:
1010 return mga_do_cleanup_dma(dev, FULL_CLEANUP);
1011 }
1012
1013 return -EINVAL;
1014 }
1015
1016 /* ================================================================
1017 * Primary DMA stream management
1018 */
1019
mga_dma_flush(struct drm_device * dev,void * data,struct drm_file * file_priv)1020 int mga_dma_flush(struct drm_device *dev, void *data,
1021 struct drm_file *file_priv)
1022 {
1023 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1024 struct drm_lock *lock = data;
1025
1026 LOCK_TEST_WITH_RETURN(dev, file_priv);
1027
1028 DRM_DEBUG("%s%s%s\n",
1029 (lock->flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
1030 (lock->flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
1031 (lock->flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");
1032
1033 WRAP_WAIT_WITH_RETURN(dev_priv);
1034
1035 if (lock->flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL))
1036 mga_do_dma_flush(dev_priv);
1037
1038 if (lock->flags & _DRM_LOCK_QUIESCENT) {
1039 #if MGA_DMA_DEBUG
1040 int ret = mga_do_wait_for_idle(dev_priv);
1041 if (ret < 0)
1042 DRM_INFO("-EBUSY\n");
1043 return ret;
1044 #else
1045 return mga_do_wait_for_idle(dev_priv);
1046 #endif
1047 } else {
1048 return 0;
1049 }
1050 }
1051
mga_dma_reset(struct drm_device * dev,void * data,struct drm_file * file_priv)1052 int mga_dma_reset(struct drm_device *dev, void *data,
1053 struct drm_file *file_priv)
1054 {
1055 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1056
1057 LOCK_TEST_WITH_RETURN(dev, file_priv);
1058
1059 return mga_do_dma_reset(dev_priv);
1060 }
1061
1062 /* ================================================================
1063 * DMA buffer management
1064 */
1065
mga_dma_get_buffers(struct drm_device * dev,struct drm_file * file_priv,struct drm_dma * d)1066 static int mga_dma_get_buffers(struct drm_device *dev,
1067 struct drm_file *file_priv, struct drm_dma *d)
1068 {
1069 struct drm_buf *buf;
1070 int i;
1071
1072 for (i = d->granted_count; i < d->request_count; i++) {
1073 buf = mga_freelist_get(dev);
1074 if (!buf)
1075 return -EAGAIN;
1076
1077 buf->file_priv = file_priv;
1078
1079 if (copy_to_user(&d->request_indices[i],
1080 &buf->idx, sizeof(buf->idx)))
1081 return -EFAULT;
1082 if (copy_to_user(&d->request_sizes[i],
1083 &buf->total, sizeof(buf->total)))
1084 return -EFAULT;
1085
1086 d->granted_count++;
1087 }
1088 return 0;
1089 }
1090
mga_dma_buffers(struct drm_device * dev,void * data,struct drm_file * file_priv)1091 int mga_dma_buffers(struct drm_device *dev, void *data,
1092 struct drm_file *file_priv)
1093 {
1094 struct drm_device_dma *dma = dev->dma;
1095 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1096 struct drm_dma *d = data;
1097 int ret = 0;
1098
1099 LOCK_TEST_WITH_RETURN(dev, file_priv);
1100
1101 /* Please don't send us buffers.
1102 */
1103 if (d->send_count != 0) {
1104 DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
1105 DRM_CURRENTPID, d->send_count);
1106 return -EINVAL;
1107 }
1108
1109 /* We'll send you buffers.
1110 */
1111 if (d->request_count < 0 || d->request_count > dma->buf_count) {
1112 DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
1113 DRM_CURRENTPID, d->request_count, dma->buf_count);
1114 return -EINVAL;
1115 }
1116
1117 WRAP_TEST_WITH_RETURN(dev_priv);
1118
1119 d->granted_count = 0;
1120
1121 if (d->request_count)
1122 ret = mga_dma_get_buffers(dev, file_priv, d);
1123
1124 return ret;
1125 }
1126
1127 /**
1128 * Called just before the module is unloaded.
1129 */
mga_driver_unload(struct drm_device * dev)1130 int mga_driver_unload(struct drm_device *dev)
1131 {
1132 kfree(dev->dev_private);
1133 dev->dev_private = NULL;
1134
1135 return 0;
1136 }
1137
1138 /**
1139 * Called when the last opener of the device is closed.
1140 */
mga_driver_lastclose(struct drm_device * dev)1141 void mga_driver_lastclose(struct drm_device *dev)
1142 {
1143 mga_do_cleanup_dma(dev, FULL_CLEANUP);
1144 }
1145
mga_driver_dma_quiescent(struct drm_device * dev)1146 int mga_driver_dma_quiescent(struct drm_device *dev)
1147 {
1148 drm_mga_private_t *dev_priv = dev->dev_private;
1149 return mga_do_wait_for_idle(dev_priv);
1150 }
1151