2 * Copyright (c) 2011 The FreeBSD Foundation
5 * This software was developed by Konstantin Belousov under sponsorship from
6 * the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $FreeBSD: head/sys/dev/drm2/drm_gem.c 247835 2013-03-05 09:49:34Z kib $"
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/limits.h>
38 #include <sys/mutex.h>
42 #include <vm/vm_page.h>
44 #include <dev/drm/drmP.h>
45 #include <dev/drm/drm.h>
46 #include <dev/drm/drm_sarea.h>
49 * We make up offsets for buffer objects so we can recognize them at
53 /* pgoff in mmap is an unsigned long, so we need to make sure that
54 * the faked up offset will fit
57 #if ULONG_MAX == UINT64_MAX
58 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
59 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
61 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
62 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
66 drm_gem_init(struct drm_device *dev)
68 struct drm_gem_mm *mm;
70 drm_gem_names_init(&dev->object_names);
71 mm = kmalloc(sizeof(*mm), DRM_MEM_DRIVER, M_WAITOK);
73 if (drm_ht_create(&mm->offset_hash, 19) != 0) {
74 drm_free(mm, DRM_MEM_DRIVER);
77 mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL);
82 drm_gem_destroy(struct drm_device *dev)
84 struct drm_gem_mm *mm;
87 dev->mm_private = NULL;
88 drm_ht_remove(&mm->offset_hash);
89 delete_unrhdr(mm->idxunr);
90 drm_free(mm, DRM_MEM_DRIVER);
91 drm_gem_names_fini(&dev->object_names);
95 drm_gem_object_init(struct drm_device *dev, struct drm_gem_object *obj,
99 KASSERT((size & (PAGE_SIZE - 1)) == 0,
100 ("Bad size %ju", (uintmax_t)size));
103 obj->vm_obj = default_pager_alloc(NULL, size,
104 VM_PROT_READ | VM_PROT_WRITE, 0);
107 obj->handle_count = 0;
114 drm_gem_private_object_init(struct drm_device *dev, struct drm_gem_object *obj,
118 KASSERT((size & (PAGE_SIZE - 1)) == 0,
119 ("Bad size %ju", (uintmax_t)size));
125 atomic_set(&obj->handle_count, 0);
132 struct drm_gem_object *
133 drm_gem_object_alloc(struct drm_device *dev, size_t size)
135 struct drm_gem_object *obj;
137 obj = kmalloc(sizeof(*obj), DRM_MEM_DRIVER, M_WAITOK | M_ZERO);
138 if (drm_gem_object_init(dev, obj, size) != 0)
141 if (dev->driver->gem_init_object != NULL &&
142 dev->driver->gem_init_object(obj) != 0)
146 vm_object_deallocate(obj->vm_obj);
148 drm_free(obj, DRM_MEM_DRIVER);
153 drm_gem_object_free(struct drm_gem_object *obj)
155 struct drm_device *dev;
158 DRM_LOCK_ASSERT(dev);
159 if (dev->driver->gem_free_object != NULL)
160 dev->driver->gem_free_object(obj);
164 drm_gem_object_reference(struct drm_gem_object *obj)
167 KASSERT(obj->refcount > 0, ("Dandling obj %p", obj));
168 refcount_acquire(&obj->refcount);
172 drm_gem_object_unreference(struct drm_gem_object *obj)
177 if (refcount_release(&obj->refcount))
178 drm_gem_object_free(obj);
182 drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
184 struct drm_device *dev;
190 drm_gem_object_unreference(obj);
195 drm_gem_object_handle_reference(struct drm_gem_object *obj)
198 drm_gem_object_reference(obj);
199 atomic_add_rel_int(&obj->handle_count, 1);
203 drm_gem_object_handle_free(struct drm_gem_object *obj)
205 struct drm_device *dev;
206 struct drm_gem_object *obj1;
209 if (obj->name != 0) {
210 obj1 = drm_gem_names_remove(&dev->object_names, obj->name);
212 drm_gem_object_unreference(obj1);
217 drm_gem_object_handle_unreference(struct drm_gem_object *obj)
221 atomic_load_acq_int(&obj->handle_count) == 0)
224 if (atomic_fetchadd_int(&obj->handle_count, -1) == 1)
225 drm_gem_object_handle_free(obj);
226 drm_gem_object_unreference(obj);
230 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
234 atomic_load_acq_int(&obj->handle_count) == 0)
237 if (atomic_fetchadd_int(&obj->handle_count, -1) == 1)
238 drm_gem_object_handle_free(obj);
239 drm_gem_object_unreference_unlocked(obj);
243 drm_gem_handle_create(struct drm_file *file_priv, struct drm_gem_object *obj,
248 error = drm_gem_name_create(&file_priv->object_names, obj, handle);
251 drm_gem_object_handle_reference(obj);
256 drm_gem_handle_delete(struct drm_file *file_priv, uint32_t handle)
258 struct drm_gem_object *obj;
260 obj = drm_gem_names_remove(&file_priv->object_names, handle);
263 drm_gem_object_handle_unreference_unlocked(obj);
268 drm_gem_object_release(struct drm_gem_object *obj)
272 * obj->vm_obj can be NULL for private gem objects.
274 vm_object_deallocate(obj->vm_obj);
278 drm_gem_open_ioctl(struct drm_device *dev, void *data,
279 struct drm_file *file_priv)
281 struct drm_gem_open *args;
282 struct drm_gem_object *obj;
286 if (!drm_core_check_feature(dev, DRIVER_GEM))
290 obj = drm_gem_name_ref(&dev->object_names, args->name,
291 (void (*)(void *))drm_gem_object_reference);
295 ret = drm_gem_handle_create(file_priv, obj, &handle);
296 drm_gem_object_unreference_unlocked(obj);
300 args->handle = handle;
301 args->size = obj->size;
307 drm_gem_open(struct drm_device *dev, struct drm_file *file_priv)
310 drm_gem_names_init(&file_priv->object_names);
314 drm_gem_object_release_handle(uint32_t name, void *ptr, void *arg)
316 struct drm_gem_object *obj;
319 drm_gem_object_handle_unreference(obj);
324 drm_gem_release(struct drm_device *dev, struct drm_file *file_priv)
327 drm_gem_names_foreach(&file_priv->object_names,
328 drm_gem_object_release_handle, NULL);
329 drm_gem_names_fini(&file_priv->object_names);
333 drm_gem_close_ioctl(struct drm_device *dev, void *data,
334 struct drm_file *file_priv)
336 struct drm_gem_close *args;
338 if (!drm_core_check_feature(dev, DRIVER_GEM))
342 return (drm_gem_handle_delete(file_priv, args->handle));
346 drm_gem_flink_ioctl(struct drm_device *dev, void *data,
347 struct drm_file *file_priv)
349 struct drm_gem_flink *args;
350 struct drm_gem_object *obj;
353 if (!drm_core_check_feature(dev, DRIVER_GEM))
357 obj = drm_gem_name_ref(&file_priv->object_names, args->handle,
358 (void (*)(void *))drm_gem_object_reference);
361 error = drm_gem_name_create(&dev->object_names, obj, &obj->name);
363 if (error == EALREADY)
365 drm_gem_object_unreference_unlocked(obj);
368 args->name = obj->name;
372 struct drm_gem_object *
373 drm_gem_object_lookup(struct drm_device *dev, struct drm_file *file_priv,
376 struct drm_gem_object *obj;
378 obj = drm_gem_name_ref(&file_priv->object_names, handle,
379 (void (*)(void *))drm_gem_object_reference);
383 static struct drm_gem_object *
384 drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset)
386 struct drm_gem_object *obj;
387 struct drm_gem_mm *mm;
388 struct drm_hash_item *map_list;
390 if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY)
392 offset &= ~DRM_GEM_MAPPING_KEY;
393 mm = dev->mm_private;
394 if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset),
396 DRM_DEBUG("drm_gem_object_from_offset: offset 0x%jx obj not found\n",
400 obj = container_of(map_list, struct drm_gem_object, map_list);
405 drm_gem_create_mmap_offset(struct drm_gem_object *obj)
407 struct drm_device *dev;
408 struct drm_gem_mm *mm;
414 mm = dev->mm_private;
417 obj->map_list.key = alloc_unr(mm->idxunr);
418 ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list);
420 DRM_ERROR("failed to add to map hash\n");
421 free_unr(mm->idxunr, obj->map_list.key);
429 drm_gem_free_mmap_offset(struct drm_gem_object *obj)
431 struct drm_hash_item *list;
432 struct drm_gem_mm *mm;
436 mm = obj->dev->mm_private;
437 list = &obj->map_list;
439 drm_ht_remove_item(&mm->offset_hash, list);
440 free_unr(mm->idxunr, list->key);
445 drm_gem_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, vm_size_t size,
446 struct vm_object **obj_res, int nprot)
448 struct drm_gem_object *gem_obj;
449 struct vm_object *vm_obj;
452 gem_obj = drm_gem_object_from_offset(dev, *offset);
453 if (gem_obj == NULL) {
457 drm_gem_object_reference(gem_obj);
459 vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE,
460 dev->driver->gem_pager_ops, size, nprot,
461 DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred);
462 if (vm_obj == NULL) {
463 drm_gem_object_unreference_unlocked(gem_obj);
466 *offset = DRM_GEM_MAPPING_MAPOFF(*offset);
472 drm_gem_pager_dtr(void *handle)
474 struct drm_gem_object *obj;
475 struct drm_device *dev;
481 drm_gem_free_mmap_offset(obj);
482 drm_gem_object_unreference(obj);