freebsd-dev/sys/dev/drm2/drm_gem.c
Ed Schouten 7cbef24e1a Prefer __containerof() above member2struct().
The first does proper checking of the argument types, while the latter
does not.
2012-09-15 19:28:54 +00:00

488 lines
11 KiB
C

/*-
* Copyright (c) 2011 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Konstantin Belousov under sponsorship from
* the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_vm.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <dev/drm2/drmP.h>
#include <dev/drm2/drm.h>
#include <dev/drm2/drm_sarea.h>
/*
* We make up offsets for buffer objects so we can recognize them at
* mmap time.
*/
/* pgoff in mmap is an unsigned long, so we need to make sure that
* the faked up offset will fit
*/
#if ULONG_MAX == UINT64_MAX
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1)
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16)
#else
#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1)
#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16)
#endif
int
drm_gem_init(struct drm_device *dev)
{
struct drm_gem_mm *mm;
drm_gem_names_init(&dev->object_names);
mm = malloc(sizeof(*mm), DRM_MEM_DRIVER, M_WAITOK);
dev->mm_private = mm;
if (drm_ht_create(&mm->offset_hash, 19) != 0) {
free(mm, DRM_MEM_DRIVER);
return (ENOMEM);
}
mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL);
return (0);
}
void
drm_gem_destroy(struct drm_device *dev)
{
struct drm_gem_mm *mm;
mm = dev->mm_private;
dev->mm_private = NULL;
drm_ht_remove(&mm->offset_hash);
delete_unrhdr(mm->idxunr);
free(mm, DRM_MEM_DRIVER);
drm_gem_names_fini(&dev->object_names);
}
int
drm_gem_object_init(struct drm_device *dev, struct drm_gem_object *obj,
size_t size)
{
KASSERT((size & (PAGE_SIZE - 1)) == 0,
("Bad size %ju", (uintmax_t)size));
obj->dev = dev;
obj->vm_obj = vm_pager_allocate(OBJT_DEFAULT, NULL, size,
VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred);
obj->refcount = 1;
obj->handle_count = 0;
obj->size = size;
return (0);
}
int
drm_gem_private_object_init(struct drm_device *dev, struct drm_gem_object *obj,
size_t size)
{
MPASS((size & (PAGE_SIZE - 1)) == 0);
obj->dev = dev;
obj->vm_obj = NULL;
obj->refcount = 1;
atomic_set(&obj->handle_count, 0);
obj->size = size;
return (0);
}
struct drm_gem_object *
drm_gem_object_alloc(struct drm_device *dev, size_t size)
{
struct drm_gem_object *obj;
obj = malloc(sizeof(*obj), DRM_MEM_DRIVER, M_WAITOK | M_ZERO);
if (drm_gem_object_init(dev, obj, size) != 0)
goto free;
if (dev->driver->gem_init_object != NULL &&
dev->driver->gem_init_object(obj) != 0)
goto dealloc;
return (obj);
dealloc:
vm_object_deallocate(obj->vm_obj);
free:
free(obj, DRM_MEM_DRIVER);
return (NULL);
}
void
drm_gem_object_free(struct drm_gem_object *obj)
{
struct drm_device *dev;
dev = obj->dev;
DRM_LOCK_ASSERT(dev);
if (dev->driver->gem_free_object != NULL)
dev->driver->gem_free_object(obj);
}
void
drm_gem_object_reference(struct drm_gem_object *obj)
{
KASSERT(obj->refcount > 0, ("Dandling obj %p", obj));
refcount_acquire(&obj->refcount);
}
void
drm_gem_object_unreference(struct drm_gem_object *obj)
{
if (obj == NULL)
return;
if (refcount_release(&obj->refcount))
drm_gem_object_free(obj);
}
void
drm_gem_object_unreference_unlocked(struct drm_gem_object *obj)
{
struct drm_device *dev;
if (obj == NULL)
return;
dev = obj->dev;
DRM_LOCK(dev);
drm_gem_object_unreference(obj);
DRM_UNLOCK(dev);
}
void
drm_gem_object_handle_reference(struct drm_gem_object *obj)
{
drm_gem_object_reference(obj);
atomic_add_rel_int(&obj->handle_count, 1);
}
void
drm_gem_object_handle_free(struct drm_gem_object *obj)
{
struct drm_device *dev;
struct drm_gem_object *obj1;
dev = obj->dev;
if (obj->name != 0) {
obj1 = drm_gem_names_remove(&dev->object_names, obj->name);
obj->name = 0;
drm_gem_object_unreference(obj1);
}
}
void
drm_gem_object_handle_unreference(struct drm_gem_object *obj)
{
if (obj == NULL ||
atomic_load_acq_int(&obj->handle_count) == 0)
return;
if (atomic_fetchadd_int(&obj->handle_count, -1) == 1)
drm_gem_object_handle_free(obj);
drm_gem_object_unreference(obj);
}
void
drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
{
if (obj == NULL ||
atomic_load_acq_int(&obj->handle_count) == 0)
return;
if (atomic_fetchadd_int(&obj->handle_count, -1) == 1)
drm_gem_object_handle_free(obj);
drm_gem_object_unreference_unlocked(obj);
}
int
drm_gem_handle_create(struct drm_file *file_priv, struct drm_gem_object *obj,
uint32_t *handle)
{
int error;
error = drm_gem_name_create(&file_priv->object_names, obj, handle);
if (error != 0)
return (error);
drm_gem_object_handle_reference(obj);
return (0);
}
int
drm_gem_handle_delete(struct drm_file *file_priv, uint32_t handle)
{
struct drm_gem_object *obj;
obj = drm_gem_names_remove(&file_priv->object_names, handle);
if (obj == NULL)
return (EINVAL);
drm_gem_object_handle_unreference_unlocked(obj);
return (0);
}
void
drm_gem_object_release(struct drm_gem_object *obj)
{
/*
* obj->vm_obj can be NULL for private gem objects.
*/
vm_object_deallocate(obj->vm_obj);
}
int
drm_gem_open_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_gem_open *args;
struct drm_gem_object *obj;
int ret;
uint32_t handle;
if (!drm_core_check_feature(dev, DRIVER_GEM))
return (ENODEV);
args = data;
obj = drm_gem_name_ref(&dev->object_names, args->name,
(void (*)(void *))drm_gem_object_reference);
if (obj == NULL)
return (ENOENT);
handle = 0;
ret = drm_gem_handle_create(file_priv, obj, &handle);
drm_gem_object_unreference_unlocked(obj);
if (ret != 0)
return (ret);
args->handle = handle;
args->size = obj->size;
return (0);
}
void
drm_gem_open(struct drm_device *dev, struct drm_file *file_priv)
{
drm_gem_names_init(&file_priv->object_names);
}
static int
drm_gem_object_release_handle(uint32_t name, void *ptr, void *arg)
{
struct drm_gem_object *obj;
obj = ptr;
drm_gem_object_handle_unreference(obj);
return (0);
}
void
drm_gem_release(struct drm_device *dev, struct drm_file *file_priv)
{
drm_gem_names_foreach(&file_priv->object_names,
drm_gem_object_release_handle, NULL);
drm_gem_names_fini(&file_priv->object_names);
}
int
drm_gem_close_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_gem_close *args;
if (!drm_core_check_feature(dev, DRIVER_GEM))
return (ENODEV);
args = data;
return (drm_gem_handle_delete(file_priv, args->handle));
}
int
drm_gem_flink_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_gem_flink *args;
struct drm_gem_object *obj;
int error;
if (!drm_core_check_feature(dev, DRIVER_GEM))
return (ENODEV);
args = data;
obj = drm_gem_name_ref(&file_priv->object_names, args->handle,
(void (*)(void *))drm_gem_object_reference);
if (obj == NULL)
return (ENOENT);
error = drm_gem_name_create(&dev->object_names, obj, &obj->name);
if (error != 0) {
if (error == EALREADY)
error = 0;
drm_gem_object_unreference_unlocked(obj);
}
if (error == 0)
args->name = obj->name;
return (error);
}
struct drm_gem_object *
drm_gem_object_lookup(struct drm_device *dev, struct drm_file *file_priv,
uint32_t handle)
{
struct drm_gem_object *obj;
obj = drm_gem_name_ref(&file_priv->object_names, handle,
(void (*)(void *))drm_gem_object_reference);
return (obj);
}
static struct drm_gem_object *
drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset)
{
struct drm_gem_object *obj;
struct drm_gem_mm *mm;
struct drm_hash_item *map_list;
if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY)
return (NULL);
offset &= ~DRM_GEM_MAPPING_KEY;
mm = dev->mm_private;
if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset),
&map_list) != 0) {
DRM_DEBUG("drm_gem_object_from_offset: offset 0x%jx obj not found\n",
(uintmax_t)offset);
return (NULL);
}
obj = __containerof(map_list, struct drm_gem_object, map_list);
return (obj);
}
int
drm_gem_create_mmap_offset(struct drm_gem_object *obj)
{
struct drm_device *dev;
struct drm_gem_mm *mm;
int ret;
if (obj->on_map)
return (0);
dev = obj->dev;
mm = dev->mm_private;
ret = 0;
obj->map_list.key = alloc_unr(mm->idxunr);
ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list);
if (ret != 0) {
DRM_ERROR("failed to add to map hash\n");
free_unr(mm->idxunr, obj->map_list.key);
return (ret);
}
obj->on_map = true;
return (0);
}
void
drm_gem_free_mmap_offset(struct drm_gem_object *obj)
{
struct drm_hash_item *list;
struct drm_gem_mm *mm;
if (!obj->on_map)
return;
mm = obj->dev->mm_private;
list = &obj->map_list;
drm_ht_remove_item(&mm->offset_hash, list);
free_unr(mm->idxunr, list->key);
obj->on_map = false;
}
int
drm_gem_mmap_single(struct cdev *kdev, vm_ooffset_t *offset, vm_size_t size,
struct vm_object **obj_res, int nprot)
{
struct drm_device *dev;
struct drm_gem_object *gem_obj;
struct vm_object *vm_obj;
dev = drm_get_device_from_kdev(kdev);
if ((dev->driver->driver_features & DRIVER_GEM) == 0)
return (ENODEV);
DRM_LOCK(dev);
gem_obj = drm_gem_object_from_offset(dev, *offset);
if (gem_obj == NULL) {
DRM_UNLOCK(dev);
return (ENODEV);
}
drm_gem_object_reference(gem_obj);
DRM_UNLOCK(dev);
vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE,
dev->driver->gem_pager_ops, size, nprot,
DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred);
if (vm_obj == NULL) {
drm_gem_object_unreference_unlocked(gem_obj);
return (EINVAL);
}
*offset = DRM_GEM_MAPPING_MAPOFF(*offset);
*obj_res = vm_obj;
return (0);
}
void
drm_gem_pager_dtr(void *handle)
{
struct drm_gem_object *obj;
struct drm_device *dev;
obj = handle;
dev = obj->dev;
DRM_LOCK(dev);
drm_gem_free_mmap_offset(obj);
drm_gem_object_unreference(obj);
DRM_UNLOCK(dev);
}