drm_agpsupport.c revision 173573 
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 173573 2007-11-12 21:51:38Z jhb $");
36
37#include "dev/drm/drmP.h"
38
39#ifdef __FreeBSD__
40#if __FreeBSD_version >= 800004
41#include <dev/agp/agpreg.h>
42#else
43#include <pci/agpreg.h>
44#endif
45#include <dev/pci/pcireg.h>
46#endif
47
48/* Returns 1 if AGP or 0 if not. */
49static int
50drm_device_find_capability(drm_device_t *dev, int cap)
51{
52#ifdef __FreeBSD__
53#if __FreeBSD_version >= 602102
54
55	return (pci_find_extcap(dev->device, cap, NULL) == 0);
56#else
57	/* Code taken from agp.c.  IWBNI that was a public interface. */
58	u_int32_t status;
59	u_int8_t ptr, next;
60
61	/*
62	 * Check the CAP_LIST bit of the PCI status register first.
63	 */
64	status = pci_read_config(dev->device, PCIR_STATUS, 2);
65	if (!(status & 0x10))
66		return 0;
67
68	/*
69	 * Traverse the capabilities list.
70	 */
71	for (ptr = pci_read_config(dev->device, AGP_CAPPTR, 1);
72	     ptr != 0;
73	     ptr = next) {
74		u_int32_t capid = pci_read_config(dev->device, ptr, 4);
75		next = AGP_CAPID_GET_NEXT_PTR(capid);
76
77		/*
78		 * If this capability entry ID is cap, then we are done.
79		 */
80		if (AGP_CAPID_GET_CAP_ID(capid) == cap)
81			return 1;
82	}
83
84	return 0;
85#endif
86#else
87	/* XXX: fill me in for non-FreeBSD */
88	return 1;
89#endif
90}
91
92int drm_device_is_agp(drm_device_t *dev)
93{
94	if (dev->driver.device_is_agp != NULL) {
95		int ret;
96
97		/* device_is_agp returns a tristate, 0 = not AGP, 1 = definitely
98		 * AGP, 2 = fall back to PCI capability
99		 */
100		ret = (*dev->driver.device_is_agp)(dev);
101		if (ret != DRM_MIGHT_BE_AGP)
102			return ret;
103	}
104
105	return (drm_device_find_capability(dev, PCIY_AGP));
106}
107
108int drm_device_is_pcie(drm_device_t *dev)
109{
110	return (drm_device_find_capability(dev, PCIY_EXPRESS));
111}
112
113int drm_agp_info(drm_device_t * dev, drm_agp_info_t *info)
114{
115	struct agp_info *kern;
116
117	if (!dev->agp || !dev->agp->acquired)
118		return EINVAL;
119
120	kern                   = &dev->agp->info;
121	agp_get_info(dev->agp->agpdev, kern);
122	info->agp_version_major = 1;
123	info->agp_version_minor = 0;
124	info->mode              = kern->ai_mode;
125	info->aperture_base     = kern->ai_aperture_base;
126	info->aperture_size     = kern->ai_aperture_size;
127	info->memory_allowed    = kern->ai_memory_allowed;
128	info->memory_used       = kern->ai_memory_used;
129	info->id_vendor         = kern->ai_devid & 0xffff;
130	info->id_device         = kern->ai_devid >> 16;
131
132	return 0;
133}
134
135int drm_agp_info_ioctl(DRM_IOCTL_ARGS)
136{
137	int err;
138	drm_agp_info_t info;
139	DRM_DEVICE;
140
141	err = drm_agp_info(dev, &info);
142	if (err != 0)
143		return err;
144
145	*(drm_agp_info_t *) data = info;
146	return 0;
147}
148
149int drm_agp_acquire_ioctl(DRM_IOCTL_ARGS)
150{
151	DRM_DEVICE;
152
153	return drm_agp_acquire(dev);
154}
155
156int drm_agp_acquire(drm_device_t *dev)
157{
158	int retcode;
159
160	if (!dev->agp || dev->agp->acquired)
161		return EINVAL;
162
163	retcode = agp_acquire(dev->agp->agpdev);
164	if (retcode)
165		return retcode;
166
167	dev->agp->acquired = 1;
168	return 0;
169}
170
171int drm_agp_release_ioctl(DRM_IOCTL_ARGS)
172{
173	DRM_DEVICE;
174
175	return drm_agp_release(dev);
176}
177
178int drm_agp_release(drm_device_t * dev)
179{
180	if (!dev->agp || !dev->agp->acquired)
181		return EINVAL;
182	agp_release(dev->agp->agpdev);
183	dev->agp->acquired = 0;
184	return 0;
185}
186
187int drm_agp_enable(drm_device_t *dev, drm_agp_mode_t mode)
188{
189
190	if (!dev->agp || !dev->agp->acquired)
191		return EINVAL;
192
193	dev->agp->mode    = mode.mode;
194	agp_enable(dev->agp->agpdev, mode.mode);
195	dev->agp->base    = dev->agp->info.ai_aperture_base;
196	dev->agp->enabled = 1;
197	return 0;
198}
199
200int drm_agp_enable_ioctl(DRM_IOCTL_ARGS)
201{
202	drm_agp_mode_t mode;
203	DRM_DEVICE;
204
205	mode = *(drm_agp_mode_t *) data;
206
207	return drm_agp_enable(dev, mode);
208}
209
210int drm_agp_alloc(drm_device_t *dev, drm_agp_buffer_t *request)
211{
212	drm_agp_mem_t    *entry;
213	void	         *handle;
214	unsigned long    pages;
215	u_int32_t	 type;
216	struct agp_memory_info info;
217
218	if (!dev->agp || !dev->agp->acquired)
219		return EINVAL;
220
221	entry = malloc(sizeof(*entry), M_DRM, M_NOWAIT | M_ZERO);
222	if (entry == NULL)
223		return ENOMEM;
224
225	pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
226	type = (u_int32_t) request->type;
227
228	DRM_UNLOCK();
229	handle = drm_agp_allocate_memory(pages, type);
230	DRM_LOCK();
231	if (handle == NULL) {
232		free(entry, M_DRM);
233		return ENOMEM;
234	}
235
236	entry->handle    = handle;
237	entry->bound     = 0;
238	entry->pages     = pages;
239	entry->prev      = NULL;
240	entry->next      = dev->agp->memory;
241	if (dev->agp->memory)
242		dev->agp->memory->prev = entry;
243	dev->agp->memory = entry;
244
245	agp_memory_info(dev->agp->agpdev, entry->handle, &info);
246
247	request->handle   = (unsigned long) entry->handle;
248        request->physical = info.ami_physical;
249
250	return 0;
251}
252
253int drm_agp_alloc_ioctl(DRM_IOCTL_ARGS)
254{
255	DRM_DEVICE;
256	drm_agp_buffer_t request;
257	int retcode;
258
259	request = *(drm_agp_buffer_t *) data;
260
261	DRM_LOCK();
262	retcode = drm_agp_alloc(dev, &request);
263	DRM_UNLOCK();
264
265	*(drm_agp_buffer_t *) data = request;
266
267	return retcode;
268}
269
270static drm_agp_mem_t * drm_agp_lookup_entry(drm_device_t *dev, void *handle)
271{
272	drm_agp_mem_t *entry;
273
274	for (entry = dev->agp->memory; entry; entry = entry->next) {
275		if (entry->handle == handle) return entry;
276	}
277	return NULL;
278}
279
280int drm_agp_unbind(drm_device_t *dev, drm_agp_binding_t *request)
281{
282	drm_agp_mem_t     *entry;
283	int retcode;
284
285	if (!dev->agp || !dev->agp->acquired)
286		return EINVAL;
287
288	entry = drm_agp_lookup_entry(dev, (void *)request->handle);
289	if (entry == NULL || !entry->bound)
290		return EINVAL;
291
292	DRM_UNLOCK();
293	retcode = drm_agp_unbind_memory(entry->handle);
294	DRM_LOCK();
295
296	if (retcode == 0)
297		entry->bound = 0;
298
299	return retcode;
300}
301
302int drm_agp_unbind_ioctl(DRM_IOCTL_ARGS)
303{
304	DRM_DEVICE;
305	drm_agp_binding_t request;
306	int retcode;
307
308	request = *(drm_agp_binding_t *) data;
309
310	DRM_LOCK();
311	retcode = drm_agp_unbind(dev, &request);
312	DRM_UNLOCK();
313
314	return retcode;
315}
316
317int drm_agp_bind(drm_device_t *dev, drm_agp_binding_t *request)
318{
319	drm_agp_mem_t     *entry;
320	int               retcode;
321	int               page;
322
323	if (!dev->agp || !dev->agp->acquired)
324		return EINVAL;
325
326	DRM_DEBUG("agp_bind, page_size=%x\n", PAGE_SIZE);
327
328	entry = drm_agp_lookup_entry(dev, (void *)request->handle);
329	if (entry == NULL || entry->bound)
330		return EINVAL;
331
332	page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
333
334	DRM_UNLOCK();
335	retcode = drm_agp_bind_memory(entry->handle, page);
336	DRM_LOCK();
337	if (retcode == 0)
338		entry->bound = dev->agp->base + (page << PAGE_SHIFT);
339
340	return retcode;
341}
342
343int drm_agp_bind_ioctl(DRM_IOCTL_ARGS)
344{
345	DRM_DEVICE;
346	drm_agp_binding_t request;
347	int retcode;
348
349	request = *(drm_agp_binding_t *) data;
350
351	DRM_LOCK();
352	retcode = drm_agp_bind(dev, &request);
353	DRM_UNLOCK();
354
355	return retcode;
356}
357
358int drm_agp_free(drm_device_t *dev, drm_agp_buffer_t *request)
359{
360	drm_agp_mem_t    *entry;
361
362	if (!dev->agp || !dev->agp->acquired)
363		return EINVAL;
364
365	entry = drm_agp_lookup_entry(dev, (void*)request->handle);
366	if (entry == NULL)
367		return EINVAL;
368
369	if (entry->prev)
370		entry->prev->next = entry->next;
371	else
372		dev->agp->memory  = entry->next;
373	if (entry->next)
374		entry->next->prev = entry->prev;
375
376	DRM_UNLOCK();
377	if (entry->bound)
378		drm_agp_unbind_memory(entry->handle);
379	drm_agp_free_memory(entry->handle);
380	DRM_LOCK();
381
382	free(entry, M_DRM);
383
384	return 0;
385
386}
387
388int drm_agp_free_ioctl(DRM_IOCTL_ARGS)
389{
390	DRM_DEVICE;
391	drm_agp_buffer_t request;
392	int retcode;
393
394	request = *(drm_agp_buffer_t *) data;
395
396	DRM_LOCK();
397	retcode = drm_agp_free(dev, &request);
398	DRM_UNLOCK();
399
400	return retcode;
401}
402
403drm_agp_head_t *drm_agp_init(void)
404{
405	device_t agpdev;
406	drm_agp_head_t *head   = NULL;
407	int      agp_available = 1;
408
409	agpdev = DRM_AGP_FIND_DEVICE();
410	if (!agpdev)
411		agp_available = 0;
412
413	DRM_DEBUG("agp_available = %d\n", agp_available);
414
415	if (agp_available) {
416		head = malloc(sizeof(*head), M_DRM, M_NOWAIT | M_ZERO);
417		if (head == NULL)
418			return NULL;
419		head->agpdev = agpdev;
420		agp_get_info(agpdev, &head->info);
421		head->memory = NULL;
422		DRM_INFO("AGP at 0x%08lx %dMB\n",
423			 (long)head->info.ai_aperture_base,
424			 (int)(head->info.ai_aperture_size >> 20));
425	}
426	return head;
427}
428
429void *drm_agp_allocate_memory(size_t pages, u32 type)
430{
431	device_t agpdev;
432
433	agpdev = DRM_AGP_FIND_DEVICE();
434	if (!agpdev)
435		return NULL;
436
437	return agp_alloc_memory(agpdev, type, pages << AGP_PAGE_SHIFT);
438}
439
440int drm_agp_free_memory(void *handle)
441{
442	device_t agpdev;
443
444	agpdev = DRM_AGP_FIND_DEVICE();
445	if (!agpdev || !handle)
446		return 0;
447
448	agp_free_memory(agpdev, handle);
449	return 1;
450}
451
452int drm_agp_bind_memory(void *handle, off_t start)
453{
454	device_t agpdev;
455
456	agpdev = DRM_AGP_FIND_DEVICE();
457	if (!agpdev || !handle)
458		return EINVAL;
459
460	return agp_bind_memory(agpdev, handle, start * PAGE_SIZE);
461}
462
463int drm_agp_unbind_memory(void *handle)
464{
465	device_t agpdev;
466
467	agpdev = DRM_AGP_FIND_DEVICE();
468	if (!agpdev || !handle)
469		return EINVAL;
470
471	return agp_unbind_memory(agpdev, handle);
472}
473