Root/drivers/gpu/drm/drm_agpsupport.c

1/**
2 * \file drm_agpsupport.c
3 * DRM support for AGP/GART backend
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
9/*
10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
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:
20 *
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
23 * Software.
24 *
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.
32 */
33
34#include "drmP.h"
35#include <linux/module.h>
36#include <linux/slab.h>
37
38#if __OS_HAS_AGP
39
40#include <asm/agp.h>
41
42/**
43 * Get AGP information.
44 *
45 * \param inode device inode.
46 * \param file_priv DRM file private.
47 * \param cmd command.
48 * \param arg pointer to a (output) drm_agp_info structure.
49 * \return zero on success or a negative number on failure.
50 *
51 * Verifies the AGP device has been initialized and acquired and fills in the
52 * drm_agp_info structure with the information in drm_agp_head::agp_info.
53 */
54int drm_agp_info(struct drm_device *dev, struct drm_agp_info *info)
55{
56    DRM_AGP_KERN *kern;
57
58    if (!dev->agp || !dev->agp->acquired)
59        return -EINVAL;
60
61    kern = &dev->agp->agp_info;
62    info->agp_version_major = kern->version.major;
63    info->agp_version_minor = kern->version.minor;
64    info->mode = kern->mode;
65    info->aperture_base = kern->aper_base;
66    info->aperture_size = kern->aper_size * 1024 * 1024;
67    info->memory_allowed = kern->max_memory << PAGE_SHIFT;
68    info->memory_used = kern->current_memory << PAGE_SHIFT;
69    info->id_vendor = kern->device->vendor;
70    info->id_device = kern->device->device;
71
72    return 0;
73}
74
75EXPORT_SYMBOL(drm_agp_info);
76
77int drm_agp_info_ioctl(struct drm_device *dev, void *data,
78               struct drm_file *file_priv)
79{
80    struct drm_agp_info *info = data;
81    int err;
82
83    err = drm_agp_info(dev, info);
84    if (err)
85        return err;
86
87    return 0;
88}
89
90/**
91 * Acquire the AGP device.
92 *
93 * \param dev DRM device that is to acquire AGP.
94 * \return zero on success or a negative number on failure.
95 *
96 * Verifies the AGP device hasn't been acquired before and calls
97 * \c agp_backend_acquire.
98 */
99int drm_agp_acquire(struct drm_device * dev)
100{
101    if (!dev->agp)
102        return -ENODEV;
103    if (dev->agp->acquired)
104        return -EBUSY;
105    if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
106        return -ENODEV;
107    dev->agp->acquired = 1;
108    return 0;
109}
110
111EXPORT_SYMBOL(drm_agp_acquire);
112
113/**
114 * Acquire the AGP device (ioctl).
115 *
116 * \param inode device inode.
117 * \param file_priv DRM file private.
118 * \param cmd command.
119 * \param arg user argument.
120 * \return zero on success or a negative number on failure.
121 *
122 * Verifies the AGP device hasn't been acquired before and calls
123 * \c agp_backend_acquire.
124 */
125int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
126              struct drm_file *file_priv)
127{
128    return drm_agp_acquire((struct drm_device *) file_priv->minor->dev);
129}
130
131/**
132 * Release the AGP device.
133 *
134 * \param dev DRM device that is to release AGP.
135 * \return zero on success or a negative number on failure.
136 *
137 * Verifies the AGP device has been acquired and calls \c agp_backend_release.
138 */
139int drm_agp_release(struct drm_device * dev)
140{
141    if (!dev->agp || !dev->agp->acquired)
142        return -EINVAL;
143    agp_backend_release(dev->agp->bridge);
144    dev->agp->acquired = 0;
145    return 0;
146}
147EXPORT_SYMBOL(drm_agp_release);
148
149int drm_agp_release_ioctl(struct drm_device *dev, void *data,
150              struct drm_file *file_priv)
151{
152    return drm_agp_release(dev);
153}
154
155/**
156 * Enable the AGP bus.
157 *
158 * \param dev DRM device that has previously acquired AGP.
159 * \param mode Requested AGP mode.
160 * \return zero on success or a negative number on failure.
161 *
162 * Verifies the AGP device has been acquired but not enabled, and calls
163 * \c agp_enable.
164 */
165int drm_agp_enable(struct drm_device * dev, struct drm_agp_mode mode)
166{
167    if (!dev->agp || !dev->agp->acquired)
168        return -EINVAL;
169
170    dev->agp->mode = mode.mode;
171    agp_enable(dev->agp->bridge, mode.mode);
172    dev->agp->enabled = 1;
173    return 0;
174}
175
176EXPORT_SYMBOL(drm_agp_enable);
177
178int drm_agp_enable_ioctl(struct drm_device *dev, void *data,
179             struct drm_file *file_priv)
180{
181    struct drm_agp_mode *mode = data;
182
183    return drm_agp_enable(dev, *mode);
184}
185
186/**
187 * Allocate AGP memory.
188 *
189 * \param inode device inode.
190 * \param file_priv file private pointer.
191 * \param cmd command.
192 * \param arg pointer to a drm_agp_buffer structure.
193 * \return zero on success or a negative number on failure.
194 *
195 * Verifies the AGP device is present and has been acquired, allocates the
196 * memory via agp_allocate_memory() and creates a drm_agp_mem entry for it.
197 */
198int drm_agp_alloc(struct drm_device *dev, struct drm_agp_buffer *request)
199{
200    struct drm_agp_mem *entry;
201    DRM_AGP_MEM *memory;
202    unsigned long pages;
203    u32 type;
204
205    if (!dev->agp || !dev->agp->acquired)
206        return -EINVAL;
207    if (!(entry = kmalloc(sizeof(*entry), GFP_KERNEL)))
208        return -ENOMEM;
209
210    memset(entry, 0, sizeof(*entry));
211
212    pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
213    type = (u32) request->type;
214    if (!(memory = agp_allocate_memory(dev->agp->bridge, pages, type))) {
215        kfree(entry);
216        return -ENOMEM;
217    }
218
219    entry->handle = (unsigned long)memory->key + 1;
220    entry->memory = memory;
221    entry->bound = 0;
222    entry->pages = pages;
223    list_add(&entry->head, &dev->agp->memory);
224
225    request->handle = entry->handle;
226    request->physical = memory->physical;
227
228    return 0;
229}
230EXPORT_SYMBOL(drm_agp_alloc);
231
232
233int drm_agp_alloc_ioctl(struct drm_device *dev, void *data,
234            struct drm_file *file_priv)
235{
236    struct drm_agp_buffer *request = data;
237
238    return drm_agp_alloc(dev, request);
239}
240
241/**
242 * Search for the AGP memory entry associated with a handle.
243 *
244 * \param dev DRM device structure.
245 * \param handle AGP memory handle.
246 * \return pointer to the drm_agp_mem structure associated with \p handle.
247 *
248 * Walks through drm_agp_head::memory until finding a matching handle.
249 */
250static struct drm_agp_mem *drm_agp_lookup_entry(struct drm_device * dev,
251                       unsigned long handle)
252{
253    struct drm_agp_mem *entry;
254
255    list_for_each_entry(entry, &dev->agp->memory, head) {
256        if (entry->handle == handle)
257            return entry;
258    }
259    return NULL;
260}
261
262/**
263 * Unbind AGP memory from the GATT (ioctl).
264 *
265 * \param inode device inode.
266 * \param file_priv DRM file private.
267 * \param cmd command.
268 * \param arg pointer to a drm_agp_binding structure.
269 * \return zero on success or a negative number on failure.
270 *
271 * Verifies the AGP device is present and acquired, looks-up the AGP memory
272 * entry and passes it to the unbind_agp() function.
273 */
274int drm_agp_unbind(struct drm_device *dev, struct drm_agp_binding *request)
275{
276    struct drm_agp_mem *entry;
277    int ret;
278
279    if (!dev->agp || !dev->agp->acquired)
280        return -EINVAL;
281    if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
282        return -EINVAL;
283    if (!entry->bound)
284        return -EINVAL;
285    ret = drm_unbind_agp(entry->memory);
286    if (ret == 0)
287        entry->bound = 0;
288    return ret;
289}
290EXPORT_SYMBOL(drm_agp_unbind);
291
292
293int drm_agp_unbind_ioctl(struct drm_device *dev, void *data,
294             struct drm_file *file_priv)
295{
296    struct drm_agp_binding *request = data;
297
298    return drm_agp_unbind(dev, request);
299}
300
301/**
302 * Bind AGP memory into the GATT (ioctl)
303 *
304 * \param inode device inode.
305 * \param file_priv DRM file private.
306 * \param cmd command.
307 * \param arg pointer to a drm_agp_binding structure.
308 * \return zero on success or a negative number on failure.
309 *
310 * Verifies the AGP device is present and has been acquired and that no memory
311 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
312 * it to bind_agp() function.
313 */
314int drm_agp_bind(struct drm_device *dev, struct drm_agp_binding *request)
315{
316    struct drm_agp_mem *entry;
317    int retcode;
318    int page;
319
320    if (!dev->agp || !dev->agp->acquired)
321        return -EINVAL;
322    if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
323        return -EINVAL;
324    if (entry->bound)
325        return -EINVAL;
326    page = (request->offset + PAGE_SIZE - 1) / PAGE_SIZE;
327    if ((retcode = drm_bind_agp(entry->memory, page)))
328        return retcode;
329    entry->bound = dev->agp->base + (page << PAGE_SHIFT);
330    DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
331          dev->agp->base, entry->bound);
332    return 0;
333}
334EXPORT_SYMBOL(drm_agp_bind);
335
336
337int drm_agp_bind_ioctl(struct drm_device *dev, void *data,
338               struct drm_file *file_priv)
339{
340    struct drm_agp_binding *request = data;
341
342    return drm_agp_bind(dev, request);
343}
344
345/**
346 * Free AGP memory (ioctl).
347 *
348 * \param inode device inode.
349 * \param file_priv DRM file private.
350 * \param cmd command.
351 * \param arg pointer to a drm_agp_buffer structure.
352 * \return zero on success or a negative number on failure.
353 *
354 * Verifies the AGP device is present and has been acquired and looks up the
355 * AGP memory entry. If the memory it's currently bound, unbind it via
356 * unbind_agp(). Frees it via free_agp() as well as the entry itself
357 * and unlinks from the doubly linked list it's inserted in.
358 */
359int drm_agp_free(struct drm_device *dev, struct drm_agp_buffer *request)
360{
361    struct drm_agp_mem *entry;
362
363    if (!dev->agp || !dev->agp->acquired)
364        return -EINVAL;
365    if (!(entry = drm_agp_lookup_entry(dev, request->handle)))
366        return -EINVAL;
367    if (entry->bound)
368        drm_unbind_agp(entry->memory);
369
370    list_del(&entry->head);
371
372    drm_free_agp(entry->memory, entry->pages);
373    kfree(entry);
374    return 0;
375}
376EXPORT_SYMBOL(drm_agp_free);
377
378
379
380int drm_agp_free_ioctl(struct drm_device *dev, void *data,
381               struct drm_file *file_priv)
382{
383    struct drm_agp_buffer *request = data;
384
385    return drm_agp_free(dev, request);
386}
387
388/**
389 * Initialize the AGP resources.
390 *
391 * \return pointer to a drm_agp_head structure.
392 *
393 * Gets the drm_agp_t structure which is made available by the agpgart module
394 * via the inter_module_* functions. Creates and initializes a drm_agp_head
395 * structure.
396 */
397struct drm_agp_head *drm_agp_init(struct drm_device *dev)
398{
399    struct drm_agp_head *head = NULL;
400
401    if (!(head = kmalloc(sizeof(*head), GFP_KERNEL)))
402        return NULL;
403    memset((void *)head, 0, sizeof(*head));
404    head->bridge = agp_find_bridge(dev->pdev);
405    if (!head->bridge) {
406        if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
407            kfree(head);
408            return NULL;
409        }
410        agp_copy_info(head->bridge, &head->agp_info);
411        agp_backend_release(head->bridge);
412    } else {
413        agp_copy_info(head->bridge, &head->agp_info);
414    }
415    if (head->agp_info.chipset == NOT_SUPPORTED) {
416        kfree(head);
417        return NULL;
418    }
419    INIT_LIST_HEAD(&head->memory);
420    head->cant_use_aperture = head->agp_info.cant_use_aperture;
421    head->page_mask = head->agp_info.page_mask;
422    head->base = head->agp_info.aper_base;
423    return head;
424}
425
426/**
427 * Binds a collection of pages into AGP memory at the given offset, returning
428 * the AGP memory structure containing them.
429 *
430 * No reference is held on the pages during this time -- it is up to the
431 * caller to handle that.
432 */
433DRM_AGP_MEM *
434drm_agp_bind_pages(struct drm_device *dev,
435           struct page **pages,
436           unsigned long num_pages,
437           uint32_t gtt_offset,
438           u32 type)
439{
440    DRM_AGP_MEM *mem;
441    int ret, i;
442
443    DRM_DEBUG("\n");
444
445    mem = agp_allocate_memory(dev->agp->bridge, num_pages,
446                      type);
447    if (mem == NULL) {
448        DRM_ERROR("Failed to allocate memory for %ld pages\n",
449              num_pages);
450        return NULL;
451    }
452
453    for (i = 0; i < num_pages; i++)
454        mem->pages[i] = pages[i];
455    mem->page_count = num_pages;
456
457    mem->is_flushed = true;
458    ret = agp_bind_memory(mem, gtt_offset / PAGE_SIZE);
459    if (ret != 0) {
460        DRM_ERROR("Failed to bind AGP memory: %d\n", ret);
461        agp_free_memory(mem);
462        return NULL;
463    }
464
465    return mem;
466}
467EXPORT_SYMBOL(drm_agp_bind_pages);
468
469#endif /* __OS_HAS_AGP */
470

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