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: src/sys/dev/drm2/drm_gem.c,v 1.1 2012/05/22 11:07:44 kib Exp $
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/limits.h>
38 #include <sys/mutex.h>
41 #include <vm/vm_page.h>
43 #include <dev/drm2/drmP.h>
44 #include <dev/drm2/drm.h>
45 #include <dev/drm2/drm_sarea.h>
48 * We make up offsets for buffer objects so we can recognize them at
52 /* pgoff in mmap is an unsigned long, so we need to make sure that
53 * the faked up offset will fit
56 #if ULONG_MAX == UINT64_MAX
57 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
58 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
60 #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
61 #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
65 drm_gem_init(struct drm_device *dev)
67 struct drm_gem_mm *mm;
69 drm_gem_names_init(&dev->object_names);
70 mm = kmalloc(sizeof(*mm), DRM_MEM_DRIVER, M_WAITOK);
72 if (drm_ht_create(&mm->offset_hash, 19) != 0) {
73 kfree(mm, DRM_MEM_DRIVER);
76 mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL);
81 drm_gem_destroy(struct drm_device *dev)
83 struct drm_gem_mm *mm;
86 dev->mm_private = NULL;
87 drm_ht_remove(&mm->offset_hash);
88 delete_unrhdr(mm->idxunr);
89 kfree(mm, DRM_MEM_DRIVER);
90 drm_gem_names_fini(&dev->object_names);
94 drm_gem_object_init(struct drm_device *dev, struct drm_gem_object *obj,
98 KASSERT((size & (PAGE_SIZE - 1)) == 0,
99 ("Bad size %ju", (uintmax_t)size));
102 obj->vm_obj = vm_pager_allocate(OBJT_DEFAULT, NULL, size,
103 VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred);
106 obj->handle_count = 0;
113 drm_gem_private_object_init(struct drm_device *dev, struct drm_gem_object *obj,
117 MPASS((size & (PAGE_SIZE - 1)) == 0);
123 atomic_set(&obj->handle_count, 0);
130 struct drm_gem_object *
131 drm_gem_object_alloc(struct drm_device *dev, size_t size)
133 struct drm_gem_object *obj;
135 obj = kmalloc(sizeof(*obj), DRM_MEM_DRIVER, M_WAITOK | M_ZERO);
136 if (drm_gem_object_init(dev, obj, size) != 0)
139 if (dev->driver->gem_init_object != NULL &&
140 dev->driver->gem_init_object(obj) != 0)
144 vm_object_deallocate(obj->vm_obj);
146 kfree(obj, DRM_MEM_DRIVER);
151 drm_gem_object_free(struct drm_gem_object *obj)
153 struct drm_device *dev;
156 DRM_LOCK_ASSERT(dev);
157 if (dev->driver->gem_free_object != NULL)
158 dev->driver->gem_free_object(obj);
162 drm_gem_object_reference(struct drm_gem_object *obj)
165 KASSERT(obj->refcount > 0, ("Dandling obj %p", obj));
166 refcount_acquire(&obj->refcount);
170 drm_gem_object_unreference(struct drm_gem_object *obj)
175 if (refcount_release(&obj->refcount))
176 drm_gem_object_free(obj);
180 drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
182 struct drm_device *dev;
188 drm_gem_object_unreference(obj);
193 drm_gem_object_handle_reference(struct drm_gem_object *obj)
196 drm_gem_object_reference(obj);
197 atomic_add_rel_int(&obj->handle_count, 1);
201 drm_gem_object_handle_free(struct drm_gem_object *obj)
203 struct drm_device *dev;
204 struct drm_gem_object *obj1;
207 if (obj->name != 0) {
208 obj1 = drm_gem_names_remove(&dev->object_names, obj->name);
210 drm_gem_object_unreference(obj1);
215 drm_gem_object_handle_unreference(struct drm_gem_object *obj)
219 atomic_load_acq_int(&obj->handle_count) == 0)
222 if (atomic_fetchadd_int(&obj->handle_count, -1) == 1)
223 drm_gem_object_handle_free(obj);
224 drm_gem_object_unreference(obj);
228 drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
232 atomic_load_acq_int(&obj->handle_count) == 0)
235 if (atomic_fetchadd_int(&obj->handle_count, -1) == 1)
236 drm_gem_object_handle_free(obj);
237 drm_gem_object_unreference_unlocked(obj);
241 drm_gem_handle_create(struct drm_file *file_priv, struct drm_gem_object *obj,
246 error = drm_gem_name_create(&file_priv->object_names, obj, handle);
249 drm_gem_object_handle_reference(obj);
254 drm_gem_handle_delete(struct drm_file *file_priv, uint32_t handle)
256 struct drm_gem_object *obj;
258 obj = drm_gem_names_remove(&file_priv->object_names, handle);
261 drm_gem_object_handle_unreference_unlocked(obj);
266 drm_gem_object_release(struct drm_gem_object *obj)
270 * obj->vm_obj can be NULL for private gem objects.
272 vm_object_deallocate(obj->vm_obj);
276 drm_gem_open_ioctl(struct drm_device *dev, void *data,
277 struct drm_file *file_priv)
279 struct drm_gem_open *args;
280 struct drm_gem_object *obj;
284 if (!drm_core_check_feature(dev, DRIVER_GEM))
288 obj = drm_gem_name_ref(&dev->object_names, args->name,
289 (void (*)(void *))drm_gem_object_reference);
293 ret = drm_gem_handle_create(file_priv, obj, &handle);
294 drm_gem_object_unreference_unlocked(obj);
298 args->handle = handle;
299 args->size = obj->size;
305 drm_gem_open(struct drm_device *dev, struct drm_file *file_priv)
308 drm_gem_names_init(&file_priv->object_names);
312 drm_gem_object_release_handle(uint32_t name, void *ptr, void *arg)
314 struct drm_gem_object *obj;
317 drm_gem_object_handle_unreference(obj);
322 drm_gem_release(struct drm_device *dev, struct drm_file *file_priv)
325 drm_gem_names_foreach(&file_priv->object_names,
326 drm_gem_object_release_handle, NULL);
327 drm_gem_names_fini(&file_priv->object_names);
331 drm_gem_close_ioctl(struct drm_device *dev, void *data,
332 struct drm_file *file_priv)
334 struct drm_gem_close *args;
336 if (!drm_core_check_feature(dev, DRIVER_GEM))
340 return (drm_gem_handle_delete(file_priv, args->handle));
344 drm_gem_flink_ioctl(struct drm_device *dev, void *data,
345 struct drm_file *file_priv)
347 struct drm_gem_flink *args;
348 struct drm_gem_object *obj;
351 if (!drm_core_check_feature(dev, DRIVER_GEM))
355 obj = drm_gem_name_ref(&file_priv->object_names, args->handle,
356 (void (*)(void *))drm_gem_object_reference);
359 error = drm_gem_name_create(&dev->object_names, obj, &obj->name);
361 if (error == EALREADY)
363 drm_gem_object_unreference_unlocked(obj);
366 args->name = obj->name;
370 struct drm_gem_object *
371 drm_gem_object_lookup(struct drm_device *dev, struct drm_file *file_priv,
374 struct drm_gem_object *obj;
376 obj = drm_gem_name_ref(&file_priv->object_names, handle,
377 (void (*)(void *))drm_gem_object_reference);
381 static struct drm_gem_object *
382 drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset)
384 struct drm_gem_object *obj;
385 struct drm_gem_mm *mm;
386 struct drm_hash_item *map_list;
388 if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY)
390 offset &= ~DRM_GEM_MAPPING_KEY;
391 mm = dev->mm_private;
392 if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset),
394 DRM_DEBUG("drm_gem_object_from_offset: offset 0x%jx obj not found\n",
398 obj = member2struct(drm_gem_object, map_list, map_list);
403 drm_gem_create_mmap_offset(struct drm_gem_object *obj)
405 struct drm_device *dev;
406 struct drm_gem_mm *mm;
412 mm = dev->mm_private;
415 obj->map_list.key = alloc_unr(mm->idxunr);
416 ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list);
418 DRM_ERROR("failed to add to map hash\n");
419 free_unr(mm->idxunr, obj->map_list.key);
427 drm_gem_free_mmap_offset(struct drm_gem_object *obj)
429 struct drm_hash_item *list;
430 struct drm_gem_mm *mm;
434 mm = obj->dev->mm_private;
435 list = &obj->map_list;
437 drm_ht_remove_item(&mm->offset_hash, list);
438 free_unr(mm->idxunr, list->key);
443 drm_gem_mmap_single(struct cdev *kdev, vm_ooffset_t *offset, vm_size_t size,
444 struct vm_object **obj_res, int nprot)
446 struct drm_device *dev;
447 struct drm_gem_object *gem_obj;
448 struct vm_object *vm_obj;
450 dev = drm_get_device_from_kdev(kdev);
451 if ((dev->driver->driver_features & DRIVER_GEM) == 0)
454 gem_obj = drm_gem_object_from_offset(dev, *offset);
455 if (gem_obj == NULL) {
459 drm_gem_object_reference(gem_obj);
461 vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE,
462 dev->driver->gem_pager_ops, size, nprot,
463 DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred);
464 if (vm_obj == NULL) {
465 drm_gem_object_unreference_unlocked(gem_obj);
468 *offset = DRM_GEM_MAPPING_MAPOFF(*offset);
474 drm_gem_pager_dtr(void *handle)
476 struct drm_gem_object *obj;
477 struct drm_device *dev;
483 drm_gem_free_mmap_offset(obj);
484 drm_gem_object_unreference(obj);