2 * \file drm_agpsupport.c
3 * DRM support for AGP/GART backend
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
31 * OTHER DEALINGS IN THE SOFTWARE.
35 #include <linux/module.h>
36 #include "drm_legacy.h"
38 #include <dev/agp/agpreg.h>
39 #include <bus/pci/pcireg.h>
42 * Get AGP information.
44 * \param inode device inode.
45 * \param file_priv DRM file private.
47 * \param arg pointer to a (output) drm_agp_info structure.
48 * \return zero on success or a negative number on failure.
50 * Verifies the AGP device has been initialized and acquired and fills in the
51 * drm_agp_info structure with the information in drm_agp_head::agp_info.
53 int drm_agp_info(struct drm_device
*dev
, struct drm_agp_info
*info
)
55 struct agp_info
*kern
;
57 if (!dev
->agp
|| !dev
->agp
->acquired
)
60 kern
= &dev
->agp
->agp_info
;
61 agp_get_info(dev
->agp
->agpdev
, kern
);
62 info
->agp_version_major
= 1;
63 info
->agp_version_minor
= 0;
64 info
->mode
= kern
->ai_mode
;
65 info
->aperture_base
= kern
->ai_aperture_base
;
66 info
->aperture_size
= kern
->ai_aperture_size
;
67 info
->memory_allowed
= kern
->ai_memory_allowed
;
68 info
->memory_used
= kern
->ai_memory_used
;
69 info
->id_vendor
= kern
->ai_devid
& 0xffff;
70 info
->id_device
= kern
->ai_devid
>> 16;
75 EXPORT_SYMBOL(drm_agp_info
);
77 int drm_agp_info_ioctl(struct drm_device
*dev
, void *data
,
78 struct drm_file
*file_priv
)
80 struct drm_agp_info info
;
83 err
= drm_agp_info(dev
, &info
);
87 *(struct drm_agp_info
*) data
= info
;
92 * Acquire the AGP device.
94 * \param dev DRM device that is to acquire AGP.
95 * \return zero on success or a negative number on failure.
97 * Verifies the AGP device hasn't been acquired before and calls
98 * \c agp_backend_acquire.
100 int drm_agp_acquire(struct drm_device
* dev
)
104 if (!dev
->agp
|| dev
->agp
->acquired
)
107 retcode
= -agp_acquire(dev
->agp
->agpdev
);
111 dev
->agp
->acquired
= 1;
115 EXPORT_SYMBOL(drm_agp_acquire
);
118 * Acquire the AGP device (ioctl).
120 * \param inode device inode.
121 * \param file_priv DRM file private.
122 * \param cmd command.
123 * \param arg user argument.
124 * \return zero on success or a negative number on failure.
126 * Verifies the AGP device hasn't been acquired before and calls
127 * \c agp_backend_acquire.
129 int drm_agp_acquire_ioctl(struct drm_device
*dev
, void *data
,
130 struct drm_file
*file_priv
)
132 return drm_agp_acquire(dev
);
136 * Release the AGP device.
138 * \param dev DRM device that is to release AGP.
139 * \return zero on success or a negative number on failure.
141 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
143 int drm_agp_release(struct drm_device
* dev
)
145 if (!dev
->agp
|| !dev
->agp
->acquired
)
147 agp_release(dev
->agp
->agpdev
);
148 dev
->agp
->acquired
= 0;
151 EXPORT_SYMBOL(drm_agp_release
);
153 int drm_agp_release_ioctl(struct drm_device
*dev
, void *data
,
154 struct drm_file
*file_priv
)
156 return drm_agp_release(dev
);
160 * Enable the AGP bus.
162 * \param dev DRM device that has previously acquired AGP.
163 * \param mode Requested AGP mode.
164 * \return zero on success or a negative number on failure.
166 * Verifies the AGP device has been acquired but not enabled, and calls
169 int drm_agp_enable(struct drm_device
* dev
, struct drm_agp_mode mode
)
171 if (!dev
->agp
|| !dev
->agp
->acquired
)
174 dev
->agp
->mode
= mode
.mode
;
175 agp_enable(dev
->agp
->agpdev
, mode
.mode
);
176 dev
->agp
->enabled
= 1;
180 EXPORT_SYMBOL(drm_agp_enable
);
182 int drm_agp_enable_ioctl(struct drm_device
*dev
, void *data
,
183 struct drm_file
*file_priv
)
185 struct drm_agp_mode mode
;
187 mode
= *(struct drm_agp_mode
*) data
;
189 return drm_agp_enable(dev
, mode
);
192 static void *drm_agp_allocate_memory(size_t pages
, u32 type
)
196 agpdev
= agp_find_device();
200 return agp_alloc_memory(agpdev
, type
, pages
<< AGP_PAGE_SHIFT
);
204 * Allocate AGP memory.
206 * \param inode device inode.
207 * \param file_priv file private pointer.
208 * \param cmd command.
209 * \param arg pointer to a drm_agp_buffer structure.
210 * \return zero on success or a negative number on failure.
212 * Verifies the AGP device is present and has been acquired, allocates the
213 * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
215 int drm_agp_alloc(struct drm_device
*dev
, struct drm_agp_buffer
*request
)
217 struct drm_agp_mem
*entry
;
221 struct agp_memory_info info
;
223 if (!dev
->agp
|| !dev
->agp
->acquired
)
226 entry
= kmalloc(sizeof(*entry
), M_DRM
, M_WAITOK
| M_NULLOK
| M_ZERO
);
230 pages
= (request
->size
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
231 type
= (u_int32_t
) request
->type
;
233 handle
= drm_agp_allocate_memory(pages
, type
);
234 if (handle
== NULL
) {
239 entry
->handle
= handle
;
241 entry
->pages
= pages
;
243 entry
->next
= dev
->agp
->memory
;
244 if (dev
->agp
->memory
)
245 dev
->agp
->memory
->prev
= entry
;
246 dev
->agp
->memory
= entry
;
248 agp_memory_info(dev
->agp
->agpdev
, entry
->handle
, &info
);
250 request
->handle
= (unsigned long) entry
->handle
;
251 request
->physical
= info
.ami_physical
;
255 EXPORT_SYMBOL(drm_agp_alloc
);
258 int drm_agp_alloc_ioctl(struct drm_device
*dev
, void *data
,
259 struct drm_file
*file_priv
)
261 struct drm_agp_buffer request
;
264 request
= *(struct drm_agp_buffer
*) data
;
266 retcode
= drm_agp_alloc(dev
, &request
);
268 *(struct drm_agp_buffer
*) data
= request
;
274 * Search for the AGP memory entry associated with a handle.
276 * \param dev DRM device structure.
277 * \param handle AGP memory handle.
278 * \return pointer to the drm_agp_mem structure associated with \p handle.
280 * Walks through drm_agp_head::memory until finding a matching handle.
282 static struct drm_agp_mem
*drm_agp_lookup_entry(struct drm_device
* dev
,
285 struct drm_agp_mem
*entry
;
287 for (entry
= dev
->agp
->memory
; entry
; entry
= entry
->next
) {
288 if (entry
->handle
== handle
)
294 static int drm_agp_unbind_memory(void *handle
)
298 agpdev
= agp_find_device();
299 if (!agpdev
|| !handle
)
302 return -agp_unbind_memory(agpdev
, handle
);
306 * Unbind AGP memory from the GATT (ioctl).
308 * \param inode device inode.
309 * \param file_priv DRM file private.
310 * \param cmd command.
311 * \param arg pointer to a drm_agp_binding structure.
312 * \return zero on success or a negative number on failure.
314 * Verifies the AGP device is present and acquired, looks-up the AGP memory
315 * entry and passes it to the unbind_agp() function.
317 int drm_agp_unbind(struct drm_device
*dev
, struct drm_agp_binding
*request
)
319 struct drm_agp_mem
*entry
;
322 if (!dev
->agp
|| !dev
->agp
->acquired
)
324 entry
= drm_agp_lookup_entry(dev
, (void *)request
->handle
);
325 if (entry
== NULL
|| !entry
->bound
)
327 ret
= drm_agp_unbind_memory(entry
->handle
);
332 EXPORT_SYMBOL(drm_agp_unbind
);
335 int drm_agp_unbind_ioctl(struct drm_device
*dev
, void *data
,
336 struct drm_file
*file_priv
)
338 struct drm_agp_binding request
;
340 request
= *(struct drm_agp_binding
*) data
;
342 return drm_agp_unbind(dev
, &request
);
345 static int drm_agp_bind_memory(void *handle
, off_t start
)
349 agpdev
= agp_find_device();
350 if (!agpdev
|| !handle
)
353 return -agp_bind_memory(agpdev
, handle
, start
* PAGE_SIZE
);
357 * Bind AGP memory into the GATT (ioctl)
359 * \param inode device inode.
360 * \param file_priv DRM file private.
361 * \param cmd command.
362 * \param arg pointer to a drm_agp_binding structure.
363 * \return zero on success or a negative number on failure.
365 * Verifies the AGP device is present and has been acquired and that no memory
366 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
367 * it to bind_agp() function.
369 int drm_agp_bind(struct drm_device
*dev
, struct drm_agp_binding
*request
)
371 struct drm_agp_mem
*entry
;
375 if (!dev
->agp
|| !dev
->agp
->acquired
)
378 DRM_DEBUG("agp_bind, page_size=%x\n", (int)PAGE_SIZE
);
380 entry
= drm_agp_lookup_entry(dev
, (void *)request
->handle
);
381 if (entry
== NULL
|| entry
->bound
)
384 page
= (request
->offset
+ PAGE_SIZE
- 1) / PAGE_SIZE
;
386 retcode
= drm_agp_bind_memory(entry
->handle
, page
);
388 entry
->bound
= dev
->agp
->base
+ (page
<< PAGE_SHIFT
);
392 EXPORT_SYMBOL(drm_agp_bind
);
395 int drm_agp_bind_ioctl(struct drm_device
*dev
, void *data
,
396 struct drm_file
*file_priv
)
398 struct drm_agp_binding request
;
400 request
= *(struct drm_agp_binding
*) data
;
402 return drm_agp_bind(dev
, &request
);
405 static int drm_agp_free_memory(void *handle
)
409 agpdev
= agp_find_device();
410 if (!agpdev
|| !handle
)
413 agp_free_memory(agpdev
, handle
);
418 * Free AGP memory (ioctl).
420 * \param inode device inode.
421 * \param file_priv DRM file private.
422 * \param cmd command.
423 * \param arg pointer to a drm_agp_buffer structure.
424 * \return zero on success or a negative number on failure.
426 * Verifies the AGP device is present and has been acquired and looks up the
427 * AGP memory entry. If the memory it's currently bound, unbind it via
428 * unbind_agp(). Frees it via free_agp() as well as the entry itself
429 * and unlinks from the doubly linked list it's inserted in.
431 int drm_agp_free(struct drm_device
*dev
, struct drm_agp_buffer
*request
)
433 struct drm_agp_mem
*entry
;
435 if (!dev
->agp
|| !dev
->agp
->acquired
)
437 entry
= drm_agp_lookup_entry(dev
, (void*)request
->handle
);
442 entry
->prev
->next
= entry
->next
;
444 dev
->agp
->memory
= entry
->next
;
446 entry
->next
->prev
= entry
->prev
;
449 drm_agp_unbind_memory(entry
->handle
);
451 drm_agp_free_memory(entry
->handle
);
455 EXPORT_SYMBOL(drm_agp_free
);
459 int drm_agp_free_ioctl(struct drm_device
*dev
, void *data
,
460 struct drm_file
*file_priv
)
462 struct drm_agp_buffer request
;
464 request
= *(struct drm_agp_buffer
*) data
;
466 return drm_agp_free(dev
, &request
);
470 * Initialize the AGP resources.
472 * \return pointer to a drm_agp_head structure.
474 * Gets the drm_agp_t structure which is made available by the agpgart module
475 * via the inter_module_* functions. Creates and initializes a drm_agp_head
478 * Note that final cleanup of the kmalloced structure is directly done in
479 * drm_pci_agp_destroy.
481 struct drm_agp_head
*drm_agp_init(struct drm_device
*dev
)
484 struct drm_agp_head
*head
= NULL
;
485 int agp_available
= 1;
487 agpdev
= agp_find_device();
491 DRM_DEBUG("agp_available = %d\n", agp_available
);
494 head
= kmalloc(sizeof(*head
), M_DRM
,
495 M_WAITOK
| M_NULLOK
| M_ZERO
);
498 head
->agpdev
= agpdev
;
499 agp_get_info(agpdev
, &head
->agp_info
);
500 head
->base
= head
->agp_info
.ai_aperture_base
;
502 DRM_INFO("AGP at 0x%08lx %dMB\n",
503 (long)head
->agp_info
.ai_aperture_base
,
504 (int)(head
->agp_info
.ai_aperture_size
>> 20));
510 * drm_agp_clear - Clear AGP resource list
513 * Iterate over all AGP resources and remove them. But keep the AGP head
514 * intact so it can still be used. It is safe to call this if AGP is disabled or
515 * was already removed.
517 * If DRIVER_MODESET is active, nothing is done to protect the modesetting
518 * resources from getting destroyed. Drivers are responsible of cleaning them up
519 * during device shutdown.
521 void drm_agp_clear(struct drm_device
*dev
)
523 struct drm_agp_mem
*entry
, *nexte
;
527 if (drm_core_check_feature(dev
, DRIVER_MODESET
))
530 /* Remove AGP resources, but leave dev->agp intact until
531 * drm_unload is called.
533 for (entry
= dev
->agp
->memory
; entry
; entry
= nexte
) {
536 drm_agp_unbind_memory(entry
->handle
);
537 drm_agp_free_memory(entry
->handle
);
540 dev
->agp
->memory
= NULL
;
542 if (dev
->agp
->acquired
)
543 drm_agp_release(dev
);
545 dev
->agp
->acquired
= 0;
546 dev
->agp
->enabled
= 0;