drm_agpsupport.c revision 157617 
1/* drm_agpsupport.h -- DRM support for AGP/GART backend -*- linux-c -*-
2 * Created: Mon Dec 13 09:56:45 1999 by faith@precisioninsight.com
3 */
4/*-
5 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
6 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
7 * All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
18 * Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
23 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 * OTHER DEALINGS IN THE SOFTWARE.
27 *
28 * Author:
29 *    Rickard E. (Rik) Faith <faith@valinux.com>
30 *    Gareth Hughes <gareth@valinux.com>
31 *
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/sys/dev/drm/drm_agpsupport.c 157617 2006-04-09 20:45:45Z anholt $");
36
37#include "dev/drm/drmP.h"
38
39#ifdef __FreeBSD__
40#include <pci/agpreg.h>
41#include <dev/pci/pcireg.h>
42#endif
43
44/* Returns 1 if AGP or 0 if not. */
45static int
46drm_device_find_capability(drm_device_t *dev, int cap)
47{
48#ifdef __FreeBSD__
49#if __FreeBSD_version >= 700010
50
51	return (pci_find_extcap(dev->device, cap, NULL) == 0);
52#else
53	/* Code taken from agp.c.  IWBNI that was a public interface. */
54	u_int32_t status;
55	u_int8_t ptr, next;
56
57	/*
58	 * Check the CAP_LIST bit of the PCI status register first.
59	 */
60	status = pci_read_config(dev->device, PCIR_STATUS, 2);
61	if (!(status & 0x10))
62		return 0;
63
64	/*
65	 * Traverse the capabilities list.
66	 */
67	for (ptr = pci_read_config(dev->device, AGP_CAPPTR, 1);
68	     ptr != 0;
69	     ptr = next) {
70		u_int32_t capid = pci_read_config(dev->device, ptr, 4);
71		next = AGP_CAPID_GET_NEXT_PTR(capid);
72
73		/*
74		 * If this capability entry ID is cap, then we are done.
75		 */
76		if (AGP_CAPID_GET_CAP_ID(capid) == cap)
77			return 1;
78	}
79
80	return 0;
81#endif
82#else
83	/* XXX: fill me in for non-FreeBSD */
84	return 1;
85#endif
86}
87
88int drm_device_is_agp(drm_device_t *dev)
89{
90	if (dev->driver.device_is_agp != NULL) {
91		int ret;
92
93		/* device_is_agp returns a tristate, 0 = not AGP, 1 = definitely
94		 * AGP, 2 = fall back to PCI capability
95		 */
96		ret = (*dev->driver.device_is_agp)(dev);
97		if (ret != DRM_MIGHT_BE_AGP)
98			return ret;
99	}
100
101	return (drm_device_find_capability(dev, PCIY_AGP));
102}
103
104int drm_device_is_pcie(drm_device_t *dev)
105{
106	return (drm_device_find_capability(dev, PCIY_EXPRESS));
107}
108
109int drm_agp_info(drm_device_t * dev, drm_agp_info_t *info)
110{
111	struct agp_info *kern;
112
113	if (!dev->agp || !dev->agp->acquired)
114		return EINVAL;
115
116	kern                   = &dev->agp->info;
117	agp_get_info(dev->agp->agpdev, kern);
118	info->agp_version_major = 1;
119	info->agp_version_minor = 0;
120	info->mode              = kern->ai_mode;
121	info->aperture_base     = kern->ai_aperture_base;
122	info->aperture_size     = kern->ai_aperture_size;
123	info->memory_allowed    = kern->ai_memory_allowed;
124	info->memory_used       = kern->ai_memory_used;
125	info->id_vendor         = kern->ai_devid & 0xffff;
126	info->id_device         = kern->ai_devid >> 16;
127
128	return 0;
129}
130
131int drm_agp_info_ioctl(DRM_IOCTL_ARGS)
132{
133	int err;
134	drm_agp_info_t info;
135	DRM_DEVICE;
136
137	err = drm_agp_info(dev, &info);
138	if (err != 0)
139		return err;
140
141	*(drm_agp_info_t *) data = info;
142	return 0;
143}
144
145int drm_agp_acquire_ioctl(DRM_IOCTL_ARGS)
146{
147	DRM_DEVICE;
148
149	return drm_agp_acquire(dev);
150}
151
152int drm_agp_acquire(drm_device_t *dev)
153{
154	int retcode;
155
156	if (!dev->agp || dev->agp->acquired)
157		return EINVAL;
158
159	retcode = agp_acquire(dev->agp->agpdev);
160	if (retcode)
161		return retcode;
162
163	dev->agp->acquired = 1;
164	return 0;
165}
166
167int drm_agp_release_ioctl(DRM_IOCTL_ARGS)
168{
169	DRM_DEVICE;
170
171	return drm_agp_release(dev);
172}
173
174int drm_agp_release(drm_device_t * dev)
175{
176	if (!dev->agp || !dev->agp->acquired)
177		return EINVAL;
178	agp_release(dev->agp->agpdev);
179	dev->agp->acquired = 0;
180	return 0;
181}
182
183int drm_agp_enable(drm_device_t *dev, drm_agp_mode_t mode)
184{
185
186	if (!dev->agp || !dev->agp->acquired)
187		return EINVAL;
188
189	dev->agp->mode    = mode.mode;
190	agp_enable(dev->agp->agpdev, mode.mode);
191	dev->agp->base    = dev->agp->info.ai_aperture_base;
192	dev->agp->enabled = 1;
193	return 0;
194}
195
196int drm_agp_enable_ioctl(DRM_IOCTL_ARGS)
197{
198	drm_agp_mode_t mode;
199	DRM_DEVICE;
200
201	mode = *(drm_agp_mode_t *) data;
202
203	return drm_agp_enable(dev, mode);
204}
205
206int drm_agp_alloc(drm_device_t *dev, drm_agp_buffer_t *request)
207{
208	drm_agp_mem_t    *entry;
209	void	         *handle;
210	unsigned long    pages;
211	u_int32_t	 type;
212	struct agp_memory_info info;
213
214	if (!dev->agp || !dev->agp->acquired)
215		return EINVAL;
216
217	entry = malloc(sizeof(*entry), M_DRM, M_NOWAIT | M_ZERO);
218	if (entry == NULL)
219		return ENOMEM;
220
221	pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
222	type = (u_int32_t) request->type;
223
224	DRM_UNLOCK();
225	handle = drm_agp_allocate_memory(pages, type);
226	DRM_LOCK();
227	if (handle == NULL) {
228		free(entry, M_DRM);
229		return ENOMEM;
230	}
231
232	entry->handle    = handle;
233	entry->bound     = 0;
234	entry->pages     = pages;
235	entry->prev      = NULL;
236	entry->next      = dev->agp->memory;
237	if (dev->agp->memory)
238		dev->agp->memory->prev = entry;
239	dev->agp->memory = entry;
240
241	agp_memory_info(dev->agp->agpdev, entry->handle, &info);
242
243	request->handle   = (unsigned long) entry->handle;
244        request->physical = info.ami_physical;
245
246	return 0;
247}
248
249int drm_agp_alloc_ioctl(DRM_IOCTL_ARGS)
250{
251	DRM_DEVICE;
252	drm_agp_buffer_t request;
253	int retcode;
254
255	request = *(drm_agp_buffer_t *) data;
256
257	DRM_LOCK();
258	retcode = drm_agp_alloc(dev, &request);
259	DRM_UNLOCK();
260
261	*(drm_agp_buffer_t *) data = request;
262
263	return retcode;
264}
265
266static drm_agp_mem_t * drm_agp_lookup_entry(drm_device_t *dev, void *handle)
267{
268	drm_agp_mem_t *entry;
269
270	for (entry = dev->agp->memory; entry; entry = entry->next) {
271		if (entry->handle == handle) return entry;
272	}
273	return NULL;
274}
275
276int drm_agp_unbind(drm_device_t *dev, drm_agp_binding_t *request)
277{
278	drm_agp_mem_t     *entry;
279	int retcode;
280
281	if (!dev->agp || !dev->agp->acquired)
282		return EINVAL;
283
284	entry = drm_agp_lookup_entry(dev, (void *)request->handle);
285	if (entry == NULL || !entry->bound)
286		return EINVAL;
287
288	DRM_UNLOCK();
289	retcode = drm_agp_unbind_memory(entry->handle);
290	DRM_LOCK();
291
292	if (retcode == 0)
293		entry->bound = 0;
294
295	return retcode;
296}
297
298int drm_agp_unbind_ioctl(DRM_IOCTL_ARGS)
299{
300	DRM_DEVICE;
301	drm_agp_binding_t request;
302	int retcode;
303
304	request = *(drm_agp_binding_t *) data;
305
306	DRM_LOCK();
307	retcode = drm_agp_unbind(dev, &request);
308	DRM_UNLOCK();
309
310	return retcode;
311}
312
313int drm_agp_bind(drm_device_t *dev, drm_agp_binding_t *request)
314{
315	drm_agp_mem_t     *entry;
316	int               retcode;
317	int               page;
318
319	if (!dev->agp || !dev->agp->acquired)
320		return EINVAL;
321
322	DRM_DEBUG("agp_bind, page_size=%x\n", PAGE_SIZE);
323
324	entry = drm_agp_lookup_entry(dev, (void *)request->handle);
325	if (entry == NULL || entry->bound)
326		return EINVAL;
327
328	page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
329
330	DRM_UNLOCK();
331	retcode = drm_agp_bind_memory(entry->handle, page);
332	DRM_LOCK();
333	if (retcode == 0)
334		entry->bound = dev->agp->base + (page << PAGE_SHIFT);
335
336	return retcode;
337}
338
339int drm_agp_bind_ioctl(DRM_IOCTL_ARGS)
340{
341	DRM_DEVICE;
342	drm_agp_binding_t request;
343	int retcode;
344
345	request = *(drm_agp_binding_t *) data;
346
347	DRM_LOCK();
348	retcode = drm_agp_bind(dev, &request);
349	DRM_UNLOCK();
350
351	return retcode;
352}
353
354int drm_agp_free(drm_device_t *dev, drm_agp_buffer_t *request)
355{
356	drm_agp_mem_t    *entry;
357
358	if (!dev->agp || !dev->agp->acquired)
359		return EINVAL;
360
361	entry = drm_agp_lookup_entry(dev, (void*)request->handle);
362	if (entry == NULL)
363		return EINVAL;
364
365	if (entry->prev)
366		entry->prev->next = entry->next;
367	else
368		dev->agp->memory  = entry->next;
369	if (entry->next)
370		entry->next->prev = entry->prev;
371
372	DRM_UNLOCK();
373	if (entry->bound)
374		drm_agp_unbind_memory(entry->handle);
375	drm_agp_free_memory(entry->handle);
376	DRM_LOCK();
377
378	free(entry, M_DRM);
379
380	return 0;
381
382}
383
384int drm_agp_free_ioctl(DRM_IOCTL_ARGS)
385{
386	DRM_DEVICE;
387	drm_agp_buffer_t request;
388	int retcode;
389
390	request = *(drm_agp_buffer_t *) data;
391
392	DRM_LOCK();
393	retcode = drm_agp_free(dev, &request);
394	DRM_UNLOCK();
395
396	return retcode;
397}
398
399drm_agp_head_t *drm_agp_init(void)
400{
401	device_t agpdev;
402	drm_agp_head_t *head   = NULL;
403	int      agp_available = 1;
404
405	agpdev = DRM_AGP_FIND_DEVICE();
406	if (!agpdev)
407		agp_available = 0;
408
409	DRM_DEBUG("agp_available = %d\n", agp_available);
410
411	if (agp_available) {
412		head = malloc(sizeof(*head), M_DRM, M_NOWAIT | M_ZERO);
413		if (head == NULL)
414			return NULL;
415		head->agpdev = agpdev;
416		agp_get_info(agpdev, &head->info);
417		head->memory = NULL;
418		DRM_INFO("AGP at 0x%08lx %dMB\n",
419			 (long)head->info.ai_aperture_base,
420			 (int)(head->info.ai_aperture_size >> 20));
421	}
422	return head;
423}
424
425void *drm_agp_allocate_memory(size_t pages, u32 type)
426{
427	device_t agpdev;
428
429	agpdev = DRM_AGP_FIND_DEVICE();
430	if (!agpdev)
431		return NULL;
432
433	return agp_alloc_memory(agpdev, type, pages << AGP_PAGE_SHIFT);
434}
435
436int drm_agp_free_memory(void *handle)
437{
438	device_t agpdev;
439
440	agpdev = DRM_AGP_FIND_DEVICE();
441	if (!agpdev || !handle)
442		return 0;
443
444	agp_free_memory(agpdev, handle);
445	return 1;
446}
447
448int drm_agp_bind_memory(void *handle, off_t start)
449{
450	device_t agpdev;
451
452	agpdev = DRM_AGP_FIND_DEVICE();
453	if (!agpdev || !handle)
454		return EINVAL;
455
456	return agp_bind_memory(agpdev, handle, start * PAGE_SIZE);
457}
458
459int drm_agp_unbind_memory(void *handle)
460{
461	device_t agpdev;
462
463	agpdev = DRM_AGP_FIND_DEVICE();
464	if (!agpdev || !handle)
465		return EINVAL;
466
467	return agp_unbind_memory(agpdev, handle);
468}
469