drm_agpsupport.c revision 152909 
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 152909 2005-11-28 23:13:57Z 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	int ret;
49
50	if (dev->driver.device_is_agp != NULL) {
51		ret = (*dev->driver.device_is_agp)(dev);
52
53		if (ret != DRM_MIGHT_BE_AGP) {
54			return ret == 2;
55		}
56	}
57
58#ifdef __FreeBSD__
59	/* Code taken from agp.c.  IWBNI that was a public interface. */
60	u_int32_t status;
61	u_int8_t ptr, next;
62
63	/*
64	 * Check the CAP_LIST bit of the PCI status register first.
65	 */
66	status = pci_read_config(dev->device, PCIR_STATUS, 2);
67	if (!(status & 0x10))
68		return 0;
69
70	/*
71	 * Traverse the capabilities list.
72	 */
73	for (ptr = pci_read_config(dev->device, AGP_CAPPTR, 1);
74	     ptr != 0;
75	     ptr = next) {
76		u_int32_t capid = pci_read_config(dev->device, ptr, 4);
77		next = AGP_CAPID_GET_NEXT_PTR(capid);
78
79		/*
80		 * If this capability entry ID is cap, then we are done.
81		 */
82		if (AGP_CAPID_GET_CAP_ID(capid) == cap)
83			return 1;
84	}
85
86	return 0;
87#else
88	/* XXX: fill me in for non-FreeBSD */
89	return 1;
90#endif
91}
92
93int drm_device_is_agp(drm_device_t *dev)
94{
95	if (dev->driver.device_is_agp != NULL) {
96		int ret;
97
98		/* device_is_agp returns a tristate, 0 = not AGP, 1 = definitely
99		 * AGP, 2 = fall back to PCI capability
100		 */
101		ret = (*dev->driver.device_is_agp)(dev);
102		if (ret != 2)
103			return ret;
104	}
105
106	return (drm_device_find_capability(dev, PCIY_AGP));
107}
108
109int drm_device_is_pcie(drm_device_t *dev)
110{
111	return (drm_device_find_capability(dev, PCIY_EXPRESS));
112}
113
114int drm_agp_info(drm_device_t * dev, drm_agp_info_t *info)
115{
116	struct agp_info *kern;
117
118	if (!dev->agp || !dev->agp->acquired)
119		return EINVAL;
120
121	kern                   = &dev->agp->info;
122	agp_get_info(dev->agp->agpdev, kern);
123	info->agp_version_major = 1;
124	info->agp_version_minor = 0;
125	info->mode              = kern->ai_mode;
126	info->aperture_base     = kern->ai_aperture_base;
127	info->aperture_size     = kern->ai_aperture_size;
128	info->memory_allowed    = kern->ai_memory_allowed;
129	info->memory_used       = kern->ai_memory_used;
130	info->id_vendor         = kern->ai_devid & 0xffff;
131	info->id_device         = kern->ai_devid >> 16;
132
133	return 0;
134}
135
136int drm_agp_info_ioctl(DRM_IOCTL_ARGS)
137{
138	int err;
139	drm_agp_info_t info;
140	DRM_DEVICE;
141
142	err = drm_agp_info(dev, &info);
143	if (err != 0)
144		return err;
145
146	*(drm_agp_info_t *) data = info;
147	return 0;
148}
149
150int drm_agp_acquire_ioctl(DRM_IOCTL_ARGS)
151{
152	DRM_DEVICE;
153
154	return drm_agp_acquire(dev);
155}
156
157int drm_agp_acquire(drm_device_t *dev)
158{
159	int retcode;
160
161	if (!dev->agp || dev->agp->acquired)
162		return EINVAL;
163
164	retcode = agp_acquire(dev->agp->agpdev);
165	if (retcode)
166		return retcode;
167
168	dev->agp->acquired = 1;
169	return 0;
170}
171
172int drm_agp_release_ioctl(DRM_IOCTL_ARGS)
173{
174	DRM_DEVICE;
175
176	return drm_agp_release(dev);
177}
178
179int drm_agp_release(drm_device_t * dev)
180{
181	if (!dev->agp || !dev->agp->acquired)
182		return EINVAL;
183	agp_release(dev->agp->agpdev);
184	dev->agp->acquired = 0;
185	return 0;
186}
187
188int drm_agp_enable(drm_device_t *dev, drm_agp_mode_t mode)
189{
190
191	if (!dev->agp || !dev->agp->acquired)
192		return EINVAL;
193
194	dev->agp->mode    = mode.mode;
195	agp_enable(dev->agp->agpdev, mode.mode);
196	dev->agp->base    = dev->agp->info.ai_aperture_base;
197	dev->agp->enabled = 1;
198	return 0;
199}
200
201int drm_agp_enable_ioctl(DRM_IOCTL_ARGS)
202{
203	drm_agp_mode_t mode;
204	DRM_DEVICE;
205
206	mode = *(drm_agp_mode_t *) data;
207
208	return drm_agp_enable(dev, mode);
209}
210
211int drm_agp_alloc(drm_device_t *dev, drm_agp_buffer_t *request)
212{
213	drm_agp_mem_t    *entry;
214	void	         *handle;
215	unsigned long    pages;
216	u_int32_t	 type;
217	struct agp_memory_info info;
218
219	if (!dev->agp || !dev->agp->acquired)
220		return EINVAL;
221
222	entry = malloc(sizeof(*entry), M_DRM, M_NOWAIT | M_ZERO);
223	if (entry == NULL)
224		return ENOMEM;
225
226	pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
227	type = (u_int32_t) request->type;
228
229	DRM_UNLOCK();
230	handle = drm_agp_allocate_memory(pages, type);
231	DRM_LOCK();
232	if (handle == NULL) {
233		free(entry, M_DRM);
234		return ENOMEM;
235	}
236
237	entry->handle    = handle;
238	entry->bound     = 0;
239	entry->pages     = pages;
240	entry->prev      = NULL;
241	entry->next      = dev->agp->memory;
242	if (dev->agp->memory)
243		dev->agp->memory->prev = entry;
244	dev->agp->memory = entry;
245
246	agp_memory_info(dev->agp->agpdev, entry->handle, &info);
247
248	request->handle   = (unsigned long) entry->handle;
249        request->physical = info.ami_physical;
250
251	return 0;
252}
253
254int drm_agp_alloc_ioctl(DRM_IOCTL_ARGS)
255{
256	DRM_DEVICE;
257	drm_agp_buffer_t request;
258	int retcode;
259
260	request = *(drm_agp_buffer_t *) data;
261
262	DRM_LOCK();
263	retcode = drm_agp_alloc(dev, &request);
264	DRM_UNLOCK();
265
266	*(drm_agp_buffer_t *) data = request;
267
268	return retcode;
269}
270
271static drm_agp_mem_t * drm_agp_lookup_entry(drm_device_t *dev, void *handle)
272{
273	drm_agp_mem_t *entry;
274
275	for (entry = dev->agp->memory; entry; entry = entry->next) {
276		if (entry->handle == handle) return entry;
277	}
278	return NULL;
279}
280
281int drm_agp_unbind(drm_device_t *dev, drm_agp_binding_t *request)
282{
283	drm_agp_mem_t     *entry;
284	int retcode;
285
286	if (!dev->agp || !dev->agp->acquired)
287		return EINVAL;
288
289	entry = drm_agp_lookup_entry(dev, (void *)request->handle);
290	if (entry == NULL || !entry->bound)
291		return EINVAL;
292
293	DRM_UNLOCK();
294	retcode = drm_agp_unbind_memory(entry->handle);
295	DRM_LOCK();
296
297	if (retcode == 0)
298		entry->bound = 0;
299
300	return retcode;
301}
302
303int drm_agp_unbind_ioctl(DRM_IOCTL_ARGS)
304{
305	DRM_DEVICE;
306	drm_agp_binding_t request;
307	int retcode;
308
309	request = *(drm_agp_binding_t *) data;
310
311	DRM_LOCK();
312	retcode = drm_agp_unbind(dev, &request);
313	DRM_UNLOCK();
314
315	return retcode;
316}
317
318int drm_agp_bind(drm_device_t *dev, drm_agp_binding_t *request)
319{
320	drm_agp_mem_t     *entry;
321	int               retcode;
322	int               page;
323
324	if (!dev->agp || !dev->agp->acquired)
325		return EINVAL;
326
327	DRM_DEBUG("agp_bind, page_size=%x\n", PAGE_SIZE);
328
329	entry = drm_agp_lookup_entry(dev, (void *)request->handle);
330	if (entry == NULL || entry->bound)
331		return EINVAL;
332
333	page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
334
335	DRM_UNLOCK();
336	retcode = drm_agp_bind_memory(entry->handle, page);
337	DRM_LOCK();
338	if (retcode == 0)
339		entry->bound = dev->agp->base + (page << PAGE_SHIFT);
340
341	return retcode;
342}
343
344int drm_agp_bind_ioctl(DRM_IOCTL_ARGS)
345{
346	DRM_DEVICE;
347	drm_agp_binding_t request;
348	int retcode;
349
350	request = *(drm_agp_binding_t *) data;
351
352	DRM_LOCK();
353	retcode = drm_agp_bind(dev, &request);
354	DRM_UNLOCK();
355
356	return retcode;
357}
358
359int drm_agp_free(drm_device_t *dev, drm_agp_buffer_t *request)
360{
361	drm_agp_mem_t    *entry;
362
363	if (!dev->agp || !dev->agp->acquired)
364		return EINVAL;
365
366	entry = drm_agp_lookup_entry(dev, (void*)request->handle);
367	if (entry == NULL)
368		return EINVAL;
369
370	if (entry->prev)
371		entry->prev->next = entry->next;
372	else
373		dev->agp->memory  = entry->next;
374	if (entry->next)
375		entry->next->prev = entry->prev;
376
377	DRM_UNLOCK();
378	if (entry->bound)
379		drm_agp_unbind_memory(entry->handle);
380	drm_agp_free_memory(entry->handle);
381	DRM_LOCK();
382
383	free(entry, M_DRM);
384
385	return 0;
386
387}
388
389int drm_agp_free_ioctl(DRM_IOCTL_ARGS)
390{
391	DRM_DEVICE;
392	drm_agp_buffer_t request;
393	int retcode;
394
395	request = *(drm_agp_buffer_t *) data;
396
397	DRM_LOCK();
398	retcode = drm_agp_free(dev, &request);
399	DRM_UNLOCK();
400
401	return retcode;
402}
403
404drm_agp_head_t *drm_agp_init(void)
405{
406	device_t agpdev;
407	drm_agp_head_t *head   = NULL;
408	int      agp_available = 1;
409
410	agpdev = DRM_AGP_FIND_DEVICE();
411	if (!agpdev)
412		agp_available = 0;
413
414	DRM_DEBUG("agp_available = %d\n", agp_available);
415
416	if (agp_available) {
417		head = malloc(sizeof(*head), M_DRM, M_NOWAIT | M_ZERO);
418		if (head == NULL)
419			return NULL;
420		head->agpdev = agpdev;
421		agp_get_info(agpdev, &head->info);
422		head->memory = NULL;
423		DRM_INFO("AGP at 0x%08lx %dMB\n",
424			 (long)head->info.ai_aperture_base,
425			 (int)(head->info.ai_aperture_size >> 20));
426	}
427	return head;
428}
429
430void *drm_agp_allocate_memory(size_t pages, u32 type)
431{
432	device_t agpdev;
433
434	agpdev = DRM_AGP_FIND_DEVICE();
435	if (!agpdev)
436		return NULL;
437
438	return agp_alloc_memory(agpdev, type, pages << AGP_PAGE_SHIFT);
439}
440
441int drm_agp_free_memory(void *handle)
442{
443	device_t agpdev;
444
445	agpdev = DRM_AGP_FIND_DEVICE();
446	if (!agpdev || !handle)
447		return 0;
448
449	agp_free_memory(agpdev, handle);
450	return 1;
451}
452
453int drm_agp_bind_memory(void *handle, off_t start)
454{
455	device_t agpdev;
456
457	agpdev = DRM_AGP_FIND_DEVICE();
458	if (!agpdev || !handle)
459		return EINVAL;
460
461	return agp_bind_memory(agpdev, handle, start * PAGE_SIZE);
462}
463
464int drm_agp_unbind_memory(void *handle)
465{
466	device_t agpdev;
467
468	agpdev = DRM_AGP_FIND_DEVICE();
469	if (!agpdev || !handle)
470		return EINVAL;
471
472	return agp_unbind_memory(agpdev, handle);
473}
474