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drm/linux-core/drm_bo.c

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/**************************************************************************
*
* Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
#include "drmP.h"
/*
* Locking may look a bit complicated but isn't really:
*
* The buffer usage atomic_t needs to be protected by dev->struct_mutex
* when there is a chance that it can be zero before or after the operation.
*
* dev->struct_mutex also protects all lists and list heads,
* Hash tables and hash heads.
*
* bo->mutex protects the buffer object itself excluding the usage field.
* bo->mutex does also protect the buffer list heads, so to manipulate those,
* we need both the bo->mutex and the dev->struct_mutex.
*
* Locking order is bo->mutex, dev->struct_mutex. Therefore list traversal
* is a bit complicated. When dev->struct_mutex is released to grab bo->mutex,
* the list traversal will, in general, need to be restarted.
*
*/
static void drm_bo_destroy_locked(struct drm_buffer_object *bo);
static int drm_bo_setup_vm_locked(struct drm_buffer_object *bo);
static void drm_bo_unmap_virtual(struct drm_buffer_object *bo);
static inline uint64_t drm_bo_type_flags(unsigned type)
{
return (1ULL << (24 + type));
}
/*
* bo locked. dev->struct_mutex locked.
*/
void drm_bo_add_to_pinned_lru(struct drm_buffer_object *bo)
{
struct drm_mem_type_manager *man;
DRM_ASSERT_LOCKED(&bo->dev->struct_mutex);
DRM_ASSERT_LOCKED(&bo->mutex);
man = &bo->dev->bm.man[bo->pinned_mem_type];
list_add_tail(&bo->pinned_lru, &man->pinned);
}
void drm_bo_add_to_lru(struct drm_buffer_object *bo)
{
struct drm_mem_type_manager *man;
DRM_ASSERT_LOCKED(&bo->dev->struct_mutex);
if (!(bo->mem.proposed_flags & (DRM_BO_FLAG_NO_MOVE | DRM_BO_FLAG_NO_EVICT))
|| bo->mem.mem_type != bo->pinned_mem_type) {
man = &bo->dev->bm.man[bo->mem.mem_type];
list_add_tail(&bo->lru, &man->lru);
} else {
INIT_LIST_HEAD(&bo->lru);
}
}
static int drm_bo_vm_pre_move(struct drm_buffer_object *bo, int old_is_pci)
{
#ifdef DRM_ODD_MM_COMPAT
int ret;
if (!bo->map_list.map)
return 0;
ret = drm_bo_lock_kmm(bo);
if (ret)
return ret;
drm_bo_unmap_virtual(bo);
if (old_is_pci)
drm_bo_finish_unmap(bo);
#else
if (!bo->map_list.map)
return 0;
drm_bo_unmap_virtual(bo);
#endif
return 0;
}
static void drm_bo_vm_post_move(struct drm_buffer_object *bo)
{
#ifdef DRM_ODD_MM_COMPAT
int ret;
if (!bo->map_list.map)
return;
ret = drm_bo_remap_bound(bo);
if (ret) {
DRM_ERROR("Failed to remap a bound buffer object.\n"
"\tThis might cause a sigbus later.\n");
}
drm_bo_unlock_kmm(bo);
#endif
}
/*
* Call bo->mutex locked.
*/
static int drm_bo_add_ttm(struct drm_buffer_object *bo)
{
struct drm_device *dev = bo->dev;
int ret = 0;
uint32_t page_flags = 0;
DRM_ASSERT_LOCKED(&bo->mutex);
bo->ttm = NULL;
if (bo->mem.proposed_flags & DRM_BO_FLAG_WRITE)
page_flags |= DRM_TTM_PAGE_WRITE;
switch (bo->type) {
case drm_bo_type_device:
case drm_bo_type_kernel:
bo->ttm = drm_ttm_create(dev, bo->num_pages << PAGE_SHIFT,
page_flags, dev->bm.dummy_read_page);
if (!bo->ttm)
ret = -ENOMEM;
break;
case drm_bo_type_user:
bo->ttm = drm_ttm_create(dev, bo->num_pages << PAGE_SHIFT,
page_flags | DRM_TTM_PAGE_USER,
dev->bm.dummy_read_page);
if (!bo->ttm)
ret = -ENOMEM;
ret = drm_ttm_set_user(bo->ttm, current,
bo->buffer_start,
bo->num_pages);
if (ret)
return ret;
break;
default:
DRM_ERROR("Illegal buffer object type\n");
ret = -EINVAL;
break;
}
return ret;
}
static int drm_bo_handle_move_mem(struct drm_buffer_object *bo,
struct drm_bo_mem_reg *mem,
int evict, int no_wait)
{
struct drm_device *dev = bo->dev;
struct drm_buffer_manager *bm = &dev->bm;
int old_is_pci = drm_mem_reg_is_pci(dev, &bo->mem);
int new_is_pci = drm_mem_reg_is_pci(dev, mem);
struct drm_mem_type_manager *old_man = &bm->man[bo->mem.mem_type];
struct drm_mem_type_manager *new_man = &bm->man[mem->mem_type];
int ret = 0;
if (old_is_pci || new_is_pci ||
((mem->flags ^ bo->mem.flags) & DRM_BO_FLAG_CACHED))
ret = drm_bo_vm_pre_move(bo, old_is_pci);
if (ret)
return ret;
/*
* Create and bind a ttm if required.
*/
if (!(new_man->flags & _DRM_FLAG_MEMTYPE_FIXED) && (bo->ttm == NULL)) {
ret = drm_bo_add_ttm(bo);
if (ret)
goto out_err;
if (mem->mem_type != DRM_BO_MEM_LOCAL) {
ret = drm_ttm_bind(bo->ttm, mem);
if (ret)
goto out_err;
}
if (bo->mem.mem_type == DRM_BO_MEM_LOCAL) {
struct drm_bo_mem_reg *old_mem = &bo->mem;
uint64_t save_flags = old_mem->flags;
uint64_t save_proposed_flags = old_mem->proposed_flags;
*old_mem = *mem;
mem->mm_node = NULL;
old_mem->proposed_flags = save_proposed_flags;
DRM_FLAG_MASKED(save_flags, mem->flags,
DRM_BO_MASK_MEMTYPE);
goto moved;
}
}
if (!(old_man->flags & _DRM_FLAG_MEMTYPE_FIXED) &&
!(new_man->flags & _DRM_FLAG_MEMTYPE_FIXED))
ret = drm_bo_move_ttm(bo, evict, no_wait, mem);
else if (dev->driver->bo_driver->move)
ret = dev->driver->bo_driver->move(bo, evict, no_wait, mem);
else
ret = drm_bo_move_memcpy(bo, evict, no_wait, mem);
if (ret)
goto out_err;
moved:
if (old_is_pci || new_is_pci)
drm_bo_vm_post_move(bo);
if (bo->priv_flags & _DRM_BO_FLAG_EVICTED) {
ret =
dev->driver->bo_driver->invalidate_caches(dev,
bo->mem.flags);
if (ret)
DRM_ERROR("Can not flush read caches\n");
}
DRM_FLAG_MASKED(bo->priv_flags,
(evict) ? _DRM_BO_FLAG_EVICTED : 0,
_DRM_BO_FLAG_EVICTED);
if (bo->mem.mm_node)
bo->offset = (bo->mem.mm_node->start << PAGE_SHIFT) +
bm->man[bo->mem.mem_type].gpu_offset;
return 0;
out_err:
if (old_is_pci || new_is_pci)
drm_bo_vm_post_move(bo);
new_man = &bm->man[bo->mem.mem_type];
if ((new_man->flags & _DRM_FLAG_MEMTYPE_FIXED) && bo->ttm) {
drm_ttm_unbind(bo->ttm);
drm_ttm_destroy(bo->ttm);
bo->ttm = NULL;
}
return ret;
}
/*
* Call bo->mutex locked.
* Returns -EBUSY if the buffer is currently rendered to or from. 0 otherwise.
*/
static int drm_bo_busy(struct drm_buffer_object *bo, int check_unfenced)
{
struct drm_fence_object *fence = bo->fence;
if (check_unfenced && (bo->priv_flags & _DRM_BO_FLAG_UNFENCED))
return -EBUSY;
if (fence) {
if (drm_fence_object_signaled(fence, bo->fence_type)) {
drm_fence_usage_deref_unlocked(&bo->fence);
return 0;
}
drm_fence_object_flush(fence, DRM_FENCE_TYPE_EXE);
if (drm_fence_object_signaled(fence, bo->fence_type)) {
drm_fence_usage_deref_unlocked(&bo->fence);
return 0;
}
return -EBUSY;
}
return 0;
}
static int drm_bo_check_unfenced(struct drm_buffer_object *bo)
{
int ret;
mutex_lock(&bo->mutex);
ret = (bo->priv_flags & _DRM_BO_FLAG_UNFENCED);
mutex_unlock(&bo->mutex);
return ret;
}
/*
* Call bo->mutex locked.
* Wait until the buffer is idle.
*/
int drm_bo_wait(struct drm_buffer_object *bo, int lazy, int interruptible,
int no_wait, int check_unfenced)
{
int ret;
DRM_ASSERT_LOCKED(&bo->mutex);
while(unlikely(drm_bo_busy(bo, check_unfenced))) {
if (no_wait)
return -EBUSY;
if (check_unfenced && (bo->priv_flags & _DRM_BO_FLAG_UNFENCED)) {
mutex_unlock(&bo->mutex);
wait_event(bo->event_queue, !drm_bo_check_unfenced(bo));
mutex_lock(&bo->mutex);
bo->priv_flags |= _DRM_BO_FLAG_UNLOCKED;
}
if (bo->fence) {
struct drm_fence_object *fence;
uint32_t fence_type = bo->fence_type;
drm_fence_reference_unlocked(&fence, bo->fence);
mutex_unlock(&bo->mutex);
ret = drm_fence_object_wait(fence, lazy, !interruptible,
fence_type);
drm_fence_usage_deref_unlocked(&fence);
mutex_lock(&bo->mutex);
bo->priv_flags |= _DRM_BO_FLAG_UNLOCKED;
if (ret)
return ret;
}
}
return 0;
}
EXPORT_SYMBOL(drm_bo_wait);
static int drm_bo_expire_fence(struct drm_buffer_object *bo, int allow_errors)
{
struct drm_device *dev = bo->dev;
struct drm_buffer_manager *bm = &dev->bm;
if (bo->fence) {
if (bm->nice_mode) {
unsigned long _end = jiffies + 3 * DRM_HZ;
int ret;
do {
ret = drm_bo_wait(bo, 0, 0, 0, 0);
if (ret && allow_errors)
return ret;
} while (ret && !time_after_eq(jiffies, _end));
if (bo->fence) {
bm->nice_mode = 0;
DRM_ERROR("Detected GPU lockup or "
"fence driver was taken down. "
"Evicting buffer.\n");
}
}
if (bo->fence)
drm_fence_usage_deref_unlocked(&bo->fence);
}
return 0;
}
/*
* Call dev->struct_mutex locked.
* Attempts to remove all private references to a buffer by expiring its
* fence object and removing from lru lists and memory managers.
*/
static void drm_bo_cleanup_refs(struct drm_buffer_object *bo, int remove_all)
{
struct drm_device *dev = bo->dev;
struct drm_buffer_manager *bm = &dev->bm;
DRM_ASSERT_LOCKED(&dev->struct_mutex);
atomic_inc(&bo->usage);
mutex_unlock(&dev->struct_mutex);
mutex_lock(&bo->mutex);
DRM_FLAG_MASKED(bo->priv_flags, 0, _DRM_BO_FLAG_UNFENCED);
if (bo->fence && drm_fence_object_signaled(bo->fence,
bo->fence_type))
drm_fence_usage_deref_unlocked(&bo->fence);
if (bo->fence && remove_all)
(void)drm_bo_expire_fence(bo, 0);
mutex_lock(&dev->struct_mutex);
if (!atomic_dec_and_test(&bo->usage))
goto out;
if (!bo->fence) {
list_del_init(&bo->lru);
if (bo->mem.mm_node) {
drm_memrange_put_block(bo->mem.mm_node);
if (bo->pinned_node == bo->mem.mm_node)
bo->pinned_node = NULL;
bo->mem.mm_node = NULL;
}
list_del_init(&bo->pinned_lru);
if (bo->pinned_node) {
drm_memrange_put_block(bo->pinned_node);
bo->pinned_node = NULL;
}
list_del_init(&bo->ddestroy);
mutex_unlock(&bo->mutex);
drm_bo_destroy_locked(bo);
return;
}
if (list_empty(&bo->ddestroy)) {
drm_fence_object_flush(bo->fence, bo->fence_type);
list_add_tail(&bo->ddestroy, &bm->ddestroy);
schedule_delayed_work(&bm->wq,
((DRM_HZ / 100) < 1) ? 1 : DRM_HZ / 100);
}
out:
mutex_unlock(&bo->mutex);
return;
}
/*
* Verify that refcount is 0 and that there are no internal references
* to the buffer object. Then destroy it.
*/
static void drm_bo_destroy_locked(struct drm_buffer_object *bo)
{
struct drm_device *dev = bo->dev;
struct drm_buffer_manager *bm = &dev->bm;
DRM_ASSERT_LOCKED(&dev->struct_mutex);
DRM_DEBUG("freeing %p\n", bo);
if (list_empty(&bo->lru) && bo->mem.mm_node == NULL &&
list_empty(&bo->pinned_lru) && bo->pinned_node == NULL &&
list_empty(&bo->ddestroy) && atomic_read(&bo->usage) == 0) {
if (bo->fence != NULL) {
DRM_ERROR("Fence was non-zero.\n");
drm_bo_cleanup_refs(bo, 0);
return;
}
#ifdef DRM_ODD_MM_COMPAT
BUG_ON(!list_empty(&bo->vma_list));
BUG_ON(!list_empty(&bo->p_mm_list));
#endif
if (bo->ttm) {
drm_ttm_unbind(bo->ttm);
drm_ttm_destroy(bo->ttm);
bo->ttm = NULL;
}
atomic_dec(&bm->count);
drm_ctl_free(bo, sizeof(*bo), DRM_MEM_BUFOBJ);
return;
}
/*
* Some stuff is still trying to reference the buffer object.
* Get rid of those references.
*/
drm_bo_cleanup_refs(bo, 0);
return;
}
/*
* Call dev->struct_mutex locked.
*/
static void drm_bo_delayed_delete(struct drm_device *dev, int remove_all)
{
struct drm_buffer_manager *bm = &dev->bm;
struct drm_buffer_object *entry, *nentry;
struct list_head *list, *next;
list_for_each_safe(list, next, &bm->ddestroy) {
entry = list_entry(list, struct drm_buffer_object, ddestroy);
nentry = NULL;
if (next != &bm->ddestroy) {
nentry = list_entry(next, struct drm_buffer_object,
ddestroy);
atomic_inc(&nentry->usage);
}
drm_bo_cleanup_refs(entry, remove_all);
if (nentry)
atomic_dec(&nentry->usage);
}
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
static void drm_bo_delayed_workqueue(void *data)
#else
static void drm_bo_delayed_workqueue(struct work_struct *work)
#endif
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
struct drm_device *dev = (struct drm_device *) data;
struct drm_buffer_manager *bm = &dev->bm;
#else
struct drm_buffer_manager *bm =
container_of(work, struct drm_buffer_manager, wq.work);
struct drm_device *dev = container_of(bm, struct drm_device, bm);
#endif
DRM_DEBUG("Delayed delete Worker\n");
mutex_lock(&dev->struct_mutex);
if (!bm->initialized) {
mutex_unlock(&dev->struct_mutex);
return;
}
drm_bo_delayed_delete(dev, 0);
if (bm->initialized && !list_empty(&bm->ddestroy)) {
schedule_delayed_work(&bm->wq,
((DRM_HZ / 100) < 1) ? 1 : DRM_HZ / 100);
}
mutex_unlock(&dev->struct_mutex);
}
void drm_bo_usage_deref_locked(struct drm_buffer_object **bo)
{
struct drm_buffer_object *tmp_bo = *bo;
bo = NULL;
DRM_ASSERT_LOCKED(&tmp_bo->dev->struct_mutex);
if (atomic_dec_and_test(&tmp_bo->usage))
drm_bo_destroy_locked(tmp_bo);
}
EXPORT_SYMBOL(drm_bo_usage_deref_locked);
void drm_bo_usage_deref_unlocked(struct drm_buffer_object **bo)
{
struct drm_buffer_object *tmp_bo = *bo;
struct drm_device *dev = tmp_bo->dev;
*bo = NULL;
if (atomic_dec_and_test(&tmp_bo->usage)) {
mutex_lock(&dev->struct_mutex);
if (atomic_read(&tmp_bo->usage) == 0)
drm_bo_destroy_locked(tmp_bo);
mutex_unlock(&dev->struct_mutex);
}
}
EXPORT_SYMBOL(drm_bo_usage_deref_unlocked);
void drm_putback_buffer_objects(struct drm_device *dev)
{
struct drm_buffer_manager *bm = &dev->bm;
struct list_head *list = &bm->unfenced;
struct drm_buffer_object *entry, *next;
mutex_lock(&dev->struct_mutex);
list_for_each_entry_safe(entry, next, list, lru) {
atomic_inc(&entry->usage);
mutex_unlock(&dev->struct_mutex);
mutex_lock(&entry->mutex);
BUG_ON(!(entry->priv_flags & _DRM_BO_FLAG_UNFENCED));
mutex_lock(&dev->struct_mutex);
list_del_init(&entry->lru);
DRM_FLAG_MASKED(entry->priv_flags, 0, _DRM_BO_FLAG_UNFENCED);
wake_up_all(&entry->event_queue);
/*
* FIXME: Might want to put back on head of list
* instead of tail here.
*/
drm_bo_add_to_lru(entry);
mutex_unlock(&entry->mutex);
drm_bo_usage_deref_locked(&entry);
}
mutex_unlock(&dev->struct_mutex);
}
EXPORT_SYMBOL(drm_putback_buffer_objects);
/*
* Note. The caller has to register (if applicable)
* and deregister fence object usage.
*/
int drm_fence_buffer_objects(struct drm_device *dev,
struct list_head *list,
uint32_t fence_flags,
struct drm_fence_object *fence,
struct drm_fence_object **used_fence)
{
struct drm_buffer_manager *bm = &dev->bm;
struct drm_buffer_object *entry;
uint32_t fence_type = 0;
uint32_t fence_class = ~0;
int count = 0;
int ret = 0;
struct list_head *l;
mutex_lock(&dev->struct_mutex);
if (!list)
list = &bm->unfenced;
if (fence)
fence_class = fence->fence_class;
list_for_each_entry(entry, list, lru) {
BUG_ON(!(entry->priv_flags & _DRM_BO_FLAG_UNFENCED));
fence_type |= entry->new_fence_type;
if (fence_class == ~0)
fence_class = entry->new_fence_class;
else if (entry->new_fence_class != fence_class) {
DRM_ERROR("Unmatching fence classes on unfenced list: "
"%d and %d.\n",
fence_class,
entry->new_fence_class);
ret = -EINVAL;
goto out;
}
count++;
}
if (!count) {
ret = -EINVAL;
goto out;
}
if (fence) {
if ((fence_type & fence->type) != fence_type ||
(fence->fence_class != fence_class)) {
DRM_ERROR("Given fence doesn't match buffers "
"on unfenced list.\n");
ret = -EINVAL;
goto out;
}
} else {
mutex_unlock(&dev->struct_mutex);
ret = drm_fence_object_create(dev, fence_class, fence_type,
fence_flags | DRM_FENCE_FLAG_EMIT,
&fence);
mutex_lock(&dev->struct_mutex);
if (ret)
goto out;
}
count = 0;
l = list->next;
while (l != list) {
prefetch(l->next);
entry = list_entry(l, struct drm_buffer_object, lru);
atomic_inc(&entry->usage);
mutex_unlock(&dev->struct_mutex);
mutex_lock(&entry->mutex);
mutex_lock(&dev->struct_mutex);
list_del_init(l);
if (entry->priv_flags & _DRM_BO_FLAG_UNFENCED) {
count++;
if (entry->fence)
drm_fence_usage_deref_locked(&entry->fence);
entry->fence = drm_fence_reference_locked(fence);
entry->fence_class = entry->new_fence_class;
entry->fence_type = entry->new_fence_type;
DRM_FLAG_MASKED(entry->priv_flags, 0,
_DRM_BO_FLAG_UNFENCED);
wake_up_all(&entry->event_queue);
drm_bo_add_to_lru(entry);
}
mutex_unlock(&entry->mutex);
drm_bo_usage_deref_locked(&entry);
l = list->next;
}
DRM_DEBUG("Fenced %d buffers\n", count);
out:
mutex_unlock(&dev->struct_mutex);
*used_fence = fence;
return ret;
}
EXPORT_SYMBOL(drm_fence_buffer_objects);
/*
* bo->mutex locked
*/
static int drm_bo_evict(struct drm_buffer_object *bo, unsigned mem_type,
int no_wait)
{
int ret = 0;
struct drm_device *dev = bo->dev;
struct drm_bo_mem_reg evict_mem;
/*
* Someone might have modified the buffer before we took the
* buffer mutex.
*/
do {
bo->priv_flags &= ~_DRM_BO_FLAG_UNLOCKED;
if (unlikely(bo->mem.flags &
(DRM_BO_FLAG_NO_MOVE | DRM_BO_FLAG_NO_EVICT)))
goto out_unlock;
if (unlikely(bo->priv_flags & _DRM_BO_FLAG_UNFENCED))
goto out_unlock;
if (unlikely(bo->mem.mem_type != mem_type))
goto out_unlock;
ret = drm_bo_wait(bo, 0, 1, no_wait, 0);
if (ret)
goto out_unlock;
} while(bo->priv_flags & _DRM_BO_FLAG_UNLOCKED);
evict_mem = bo->mem;
evict_mem.mm_node = NULL;
evict_mem = bo->mem;
evict_mem.proposed_flags = dev->driver->bo_driver->evict_flags(bo);
mutex_lock(&dev->struct_mutex);
list_del_init(&bo->lru);
mutex_unlock(&dev->struct_mutex);
ret = drm_bo_mem_space(bo, &evict_mem, no_wait);
if (ret) {
if (ret != -EAGAIN)
DRM_ERROR("Failed to find memory space for "
"buffer 0x%p eviction.\n", bo);
goto out;
}
ret = drm_bo_handle_move_mem(bo, &evict_mem, 1, no_wait);
if (ret) {
if (ret != -EAGAIN)
DRM_ERROR("Buffer eviction failed\n");
goto out;
}
DRM_FLAG_MASKED(bo->priv_flags, _DRM_BO_FLAG_EVICTED,
_DRM_BO_FLAG_EVICTED);
out:
mutex_lock(&dev->struct_mutex);
if (evict_mem.mm_node) {
if (evict_mem.mm_node != bo->pinned_node)
drm_memrange_put_block(evict_mem.mm_node);
evict_mem.mm_node = NULL;
}
drm_bo_add_to_lru(bo);
BUG_ON(bo->priv_flags & _DRM_BO_FLAG_UNLOCKED);
out_unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
/**
* Repeatedly evict memory from the LRU for @mem_type until we create enough
* space, or we've evicted everything and there isn't enough space.
*/
static int drm_bo_mem_force_space(struct drm_device *dev,
struct drm_bo_mem_reg *mem,
uint32_t mem_type, int no_wait)
{
struct drm_memrange_node *node;
struct drm_buffer_manager *bm = &dev->bm;
struct drm_buffer_object *entry;
struct drm_mem_type_manager *man = &bm->man[mem_type];
struct list_head *lru;
unsigned long num_pages = mem->num_pages;
int ret;
mutex_lock(&dev->struct_mutex);
do {
node = drm_memrange_search_free(&man->manager, num_pages,
mem->page_alignment, 1);
if (node)
break;
lru = &man->lru;
if (lru->next == lru)
break;
entry = list_entry(lru->next, struct drm_buffer_object, lru);
atomic_inc(&entry->usage);
mutex_unlock(&dev->struct_mutex);
mutex_lock(&entry->mutex);
ret = drm_bo_evict(entry, mem_type, no_wait);
mutex_unlock(&entry->mutex);
drm_bo_usage_deref_unlocked(&entry);
if (ret)
return ret;
mutex_lock(&dev->struct_mutex);
} while (1);
if (!node) {
mutex_unlock(&dev->struct_mutex);
return -ENOMEM;
}
node = drm_memrange_get_block(node, num_pages, mem->page_alignment);
if (unlikely(!node)) {
mutex_unlock(&dev->struct_mutex);
return -ENOMEM;
}
mutex_unlock(&dev->struct_mutex);
mem->mm_node = node;
mem->mem_type = mem_type;
return 0;
}
static int drm_bo_mt_compatible(struct drm_mem_type_manager *man,
int disallow_fixed,
uint32_t mem_type,
uint64_t mask, uint32_t *res_mask)
{
uint64_t cur_flags = drm_bo_type_flags(mem_type);
uint64_t flag_diff;
if ((man->flags & _DRM_FLAG_MEMTYPE_FIXED) && disallow_fixed)
return 0;
if (man->flags & _DRM_FLAG_MEMTYPE_CACHED)
cur_flags |= DRM_BO_FLAG_CACHED;
if (man->flags & _DRM_FLAG_MEMTYPE_MAPPABLE)
cur_flags |= DRM_BO_FLAG_MAPPABLE;
if (man->flags & _DRM_FLAG_MEMTYPE_CSELECT)
DRM_FLAG_MASKED(cur_flags, mask, DRM_BO_FLAG_CACHED);
if ((cur_flags & mask & DRM_BO_MASK_MEM) == 0)
return 0;
if (mem_type == DRM_BO_MEM_LOCAL) {
*res_mask = cur_flags;
return 1;
}
flag_diff = (mask ^ cur_flags);
if (flag_diff & DRM_BO_FLAG_CACHED_MAPPED)
cur_flags |= DRM_BO_FLAG_CACHED_MAPPED;
if ((flag_diff & DRM_BO_FLAG_CACHED) &&
(!(mask & DRM_BO_FLAG_CACHED) ||
(mask & DRM_BO_FLAG_FORCE_CACHING)))
return 0;
if ((flag_diff & DRM_BO_FLAG_MAPPABLE) &&
((mask & DRM_BO_FLAG_MAPPABLE) ||
(mask & DRM_BO_FLAG_FORCE_MAPPABLE)))
return 0;
*res_mask = cur_flags;
return 1;
}
/**
* Creates space for memory region @mem according to its type.
*
* This function first searches for free space in compatible memory types in
* the priority order defined by the driver. If free space isn't found, then
* drm_bo_mem_force_space is attempted in priority order to evict and find
* space.
*/
int drm_bo_mem_space(struct drm_buffer_object *bo,
struct drm_bo_mem_reg *mem, int no_wait)
{
struct drm_device *dev = bo->dev;
struct drm_buffer_manager *bm = &dev->bm;
struct drm_mem_type_manager *man;
uint32_t num_prios = dev->driver->bo_driver->num_mem_type_prio;
const uint32_t *prios = dev->driver->bo_driver->mem_type_prio;
uint32_t i;
uint32_t mem_type = DRM_BO_MEM_LOCAL;
uint32_t cur_flags;
int type_found = 0;
int type_ok = 0;
int has_eagain = 0;
struct drm_memrange_node *node = NULL;
int ret;
mem->mm_node = NULL;
for (i = 0; i < num_prios; ++i) {
mem_type = prios[i];
man = &bm->man[mem_type];
type_ok = drm_bo_mt_compatible(man,
bo->type == drm_bo_type_user,
mem_type, mem->proposed_flags,
&cur_flags);
if (!type_ok)
continue;
if (mem_type == DRM_BO_MEM_LOCAL)
break;
if ((mem_type == bo->pinned_mem_type) &&
(bo->pinned_node != NULL)) {
node = bo->pinned_node;
break;
}
mutex_lock(&dev->struct_mutex);
if (man->has_type && man->use_type) {
type_found = 1;
node = drm_memrange_search_free(&man->manager, mem->num_pages,
mem->page_alignment, 1);
if (node)
node = drm_memrange_get_block(node, mem->num_pages,
mem->page_alignment);
}
mutex_unlock(&dev->struct_mutex);
if (node)
break;
}
if ((type_ok && (mem_type == DRM_BO_MEM_LOCAL)) || node) {
mem->mm_node = node;
mem->mem_type = mem_type;
mem->flags = cur_flags;
return 0;
}
if (!type_found)
return -EINVAL;
num_prios = dev->driver->bo_driver->num_mem_busy_prio;
prios = dev->driver->bo_driver->mem_busy_prio;
for (i = 0; i < num_prios; ++i) {
mem_type = prios[i];
man = &bm->man[mem_type];
if (!man->has_type)
continue;
if (!drm_bo_mt_compatible(man,
bo->type == drm_bo_type_user,
mem_type,
mem->proposed_flags,
&cur_flags))
continue;
ret = drm_bo_mem_force_space(dev, mem, mem_type, no_wait);
if (ret == 0 && mem->mm_node) {
mem->flags = cur_flags;
return 0;
}
if (ret == -EAGAIN)
has_eagain = 1;
}
ret = (has_eagain) ? -EAGAIN : -ENOMEM;
return ret;
}
EXPORT_SYMBOL(drm_bo_mem_space);
/*
* drm_bo_propose_flags:
*
* @bo: the buffer object getting new flags
*
* @new_flags: the new set of proposed flag bits
*
* @new_mask: the mask of bits changed in new_flags
*
* Modify the proposed_flag bits in @bo
*/
static int drm_bo_modify_proposed_flags (struct drm_buffer_object *bo,
uint64_t new_flags, uint64_t new_mask)
{
uint32_t new_access;
/* Copy unchanging bits from existing proposed_flags */
DRM_FLAG_MASKED(new_flags, bo->mem.proposed_flags, ~new_mask);
if (bo->type == drm_bo_type_user &&
((new_flags & (DRM_BO_FLAG_CACHED | DRM_BO_FLAG_FORCE_CACHING)) !=
(DRM_BO_FLAG_CACHED | DRM_BO_FLAG_FORCE_CACHING))) {
DRM_ERROR("User buffers require cache-coherent memory.\n");
return -EINVAL;
}
if (bo->type != drm_bo_type_kernel && (new_mask & DRM_BO_FLAG_NO_EVICT) && !DRM_SUSER(DRM_CURPROC)) {
DRM_ERROR("DRM_BO_FLAG_NO_EVICT is only available to priviliged processes.\n");
return -EPERM;
}
if (likely(new_mask & DRM_BO_MASK_MEM) &&
(bo->mem.flags & DRM_BO_FLAG_NO_EVICT) &&
!DRM_SUSER(DRM_CURPROC)) {
if (likely(bo->mem.flags & new_flags & new_mask &
DRM_BO_MASK_MEM))
new_flags = (new_flags & ~DRM_BO_MASK_MEM) |
(bo->mem.flags & DRM_BO_MASK_MEM);
else {
DRM_ERROR("Incompatible memory type specification "
"for NO_EVICT buffer.\n");
return -EPERM;
}
}
if ((new_flags & DRM_BO_FLAG_NO_MOVE)) {
DRM_ERROR("DRM_BO_FLAG_NO_MOVE is not properly implemented yet.\n");
return -EPERM;
}
new_access = new_flags & (DRM_BO_FLAG_EXE | DRM_BO_FLAG_WRITE |
DRM_BO_FLAG_READ);
if (new_access == 0) {
DRM_ERROR("Invalid buffer object rwx properties\n");
return -EINVAL;
}
bo->mem.proposed_flags = new_flags;
return 0;
}
/*
* Call bo->mutex locked.
* Returns -EBUSY if the buffer is currently rendered to or from. 0 otherwise.
* Doesn't do any fence flushing as opposed to the drm_bo_busy function.
*/
int drm_bo_quick_busy(struct drm_buffer_object *bo, int check_unfenced)
{
struct drm_fence_object *fence = bo->fence;
if (check_unfenced && (bo->priv_flags & _DRM_BO_FLAG_UNFENCED))
return -EBUSY;
if (fence) {
if (drm_fence_object_signaled(fence, bo->fence_type)) {
drm_fence_usage_deref_unlocked(&bo->fence);
return 0;
}
return -EBUSY;
}
return 0;
}
int drm_bo_evict_cached(struct drm_buffer_object *bo)
{
int ret = 0;
BUG_ON(bo->priv_flags & _DRM_BO_FLAG_UNFENCED);
if (bo->mem.mm_node)
ret = drm_bo_evict(bo, DRM_BO_MEM_TT, 1);
return ret;
}
EXPORT_SYMBOL(drm_bo_evict_cached);
/*
* Wait until a buffer is unmapped.
*/
static int drm_bo_wait_unmapped(struct drm_buffer_object *bo, int no_wait)
{
int ret = 0;
if (likely(atomic_read(&bo->mapped)) == 0)
return 0;
if (unlikely(no_wait))
return -EBUSY;
do {
mutex_unlock(&bo->mutex);
ret = wait_event_interruptible(bo->event_queue,
atomic_read(&bo->mapped) == 0);
mutex_lock(&bo->mutex);
bo->priv_flags |= _DRM_BO_FLAG_UNLOCKED;
if (ret == -ERESTARTSYS)
ret = -EAGAIN;
} while((ret == 0) && atomic_read(&bo->mapped) > 0);
return ret;
}
/*
* bo->mutex locked.
* Note that new_mem_flags are NOT transferred to the bo->mem.proposed_flags.
*/
int drm_bo_move_buffer(struct drm_buffer_object *bo, uint64_t new_mem_flags,
int no_wait, int move_unfenced)
{
struct drm_device *dev = bo->dev;
struct drm_buffer_manager *bm = &dev->bm;
int ret = 0;
struct drm_bo_mem_reg mem;
BUG_ON(bo->fence != NULL);
mem.num_pages = bo->num_pages;
mem.size = mem.num_pages << PAGE_SHIFT;
mem.proposed_flags = new_mem_flags;
mem.page_alignment = bo->mem.page_alignment;
mutex_lock(&bm->evict_mutex);
mutex_lock(&dev->struct_mutex);
list_del_init(&bo->lru);
mutex_unlock(&dev->struct_mutex);
/*
* Determine where to move the buffer.
*/
ret = drm_bo_mem_space(bo, &mem, no_wait);
if (ret)
goto out_unlock;
ret = drm_bo_handle_move_mem(bo, &mem, 0, no_wait);
out_unlock:
mutex_lock(&dev->struct_mutex);
if (ret || !move_unfenced) {
if (mem.mm_node) {
if (mem.mm_node != bo->pinned_node)
drm_memrange_put_block(mem.mm_node);
mem.mm_node = NULL;
}
drm_bo_add_to_lru(bo);
if (bo->priv_flags & _DRM_BO_FLAG_UNFENCED) {
wake_up_all(&bo->event_queue);
DRM_FLAG_MASKED(bo->priv_flags, 0,
_DRM_BO_FLAG_UNFENCED);
}
} else {
list_add_tail(&bo->lru, &bm->unfenced);
DRM_FLAG_MASKED(bo->priv_flags, _DRM_BO_FLAG_UNFENCED,
_DRM_BO_FLAG_UNFENCED);
}
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&bm->evict_mutex);
return ret;
}
static int drm_bo_mem_compat(struct drm_bo_mem_reg *mem)
{
uint32_t flag_diff = (mem->proposed_flags ^ mem->flags);
if ((mem->proposed_flags & mem->flags & DRM_BO_MASK_MEM) == 0)
return 0;
if ((flag_diff & DRM_BO_FLAG_CACHED) &&
(/* !(mem->proposed_flags & DRM_BO_FLAG_CACHED) ||*/
(mem->proposed_flags & DRM_BO_FLAG_FORCE_CACHING)))
return 0;
if ((flag_diff & DRM_BO_FLAG_MAPPABLE) &&
((mem->proposed_flags & DRM_BO_FLAG_MAPPABLE) ||
(mem->proposed_flags & DRM_BO_FLAG_FORCE_MAPPABLE)))
return 0;
return 1;
}
/**
* drm_buffer_object_validate:
*
* @bo: the buffer object to modify
*
* @fence_class: the new fence class covering this buffer
*
* @move_unfenced: a boolean indicating whether switching the
* memory space of this buffer should cause the buffer to
* be placed on the unfenced list.
*
* @no_wait: whether this function should return -EBUSY instead
* of waiting.
*
* Change buffer access parameters. This can involve moving
* the buffer to the correct memory type, pinning the buffer
* or changing the class/type of fence covering this buffer
*
* Must be called with bo locked.
*/
static int drm_buffer_object_validate(struct drm_buffer_object *bo,
uint32_t fence_class,
int move_unfenced, int no_wait,
int move_buffer)
{
struct drm_device *dev = bo->dev;
struct drm_buffer_manager *bm = &dev->bm;
int ret;
if (move_buffer) {
ret = drm_bo_move_buffer(bo, bo->mem.proposed_flags, no_wait,
move_unfenced);
if (ret) {
if (ret != -EAGAIN)
DRM_ERROR("Failed moving buffer.\n");
if (ret == -ENOMEM)
DRM_ERROR("Out of aperture space or "
"DRM memory quota.\n");
return ret;
}
}
/*
* Pinned buffers.
*/
if (bo->mem.proposed_flags & (DRM_BO_FLAG_NO_EVICT | DRM_BO_FLAG_NO_MOVE)) {
bo->pinned_mem_type = bo->mem.mem_type;
mutex_lock(&dev->struct_mutex);
list_del_init(&bo->pinned_lru);
drm_bo_add_to_pinned_lru(bo);
if (bo->pinned_node != bo->mem.mm_node) {
if (bo->pinned_node != NULL)
drm_memrange_put_block(bo->pinned_node);
bo->pinned_node = bo->mem.mm_node;
}
mutex_unlock(&dev->struct_mutex);
} else if (bo->pinned_node != NULL) {
mutex_lock(&dev->struct_mutex);
if (bo->pinned_node != bo->mem.mm_node)
drm_memrange_put_block(bo->pinned_node);
list_del_init(&bo->pinned_lru);
bo->pinned_node = NULL;
mutex_unlock(&dev->struct_mutex);
}
/*
* We might need to add a TTM.
*/
if (bo->mem.mem_type == DRM_BO_MEM_LOCAL && bo->ttm == NULL) {
ret = drm_bo_add_ttm(bo);
if (ret)
return ret;
}
/*
* Validation has succeeded, move the access and other
* non-mapping-related flag bits from the proposed flags to
* the active flags
*/
DRM_FLAG_MASKED(bo->mem.flags, bo->mem.proposed_flags, ~DRM_BO_MASK_MEMTYPE);
/*
* Finally, adjust lru to be sure.
*/
mutex_lock(&dev->struct_mutex);
list_del(&bo->lru);
if (move_unfenced) {
list_add_tail(&bo->lru, &bm->unfenced);
DRM_FLAG_MASKED(bo->priv_flags, _DRM_BO_FLAG_UNFENCED,
_DRM_BO_FLAG_UNFENCED);
} else {
drm_bo_add_to_lru(bo);
if (bo->priv_flags & _DRM_BO_FLAG_UNFENCED) {
wake_up_all(&bo->event_queue);
DRM_FLAG_MASKED(bo->priv_flags, 0,
_DRM_BO_FLAG_UNFENCED);
}
}
mutex_unlock(&dev->struct_mutex);
return 0;
}
/*
* This function is called with bo->mutex locked, but may release it
* temporarily to wait for events.
*/
static int drm_bo_prepare_for_validate(struct drm_buffer_object *bo,
uint64_t flags,
uint64_t mask,
uint32_t hint,
uint32_t fence_class,
int no_wait,
int *move_buffer)
{
struct drm_device *dev = bo->dev;
struct drm_bo_driver *driver = dev->driver->bo_driver;
uint32_t ftype;
int ret;
DRM_DEBUG("Proposed flags 0x%016llx, Old flags 0x%016llx\n",
(unsigned long long) bo->mem.proposed_flags,
(unsigned long long) bo->mem.flags);
ret = drm_bo_modify_proposed_flags (bo, flags, mask);
if (ret)
return ret;
ret = drm_bo_wait_unmapped(bo, no_wait);
if (ret)
return ret;
ret = driver->fence_type(bo, &fence_class, &ftype);
if (ret) {
DRM_ERROR("Driver did not support given buffer permissions.\n");
return ret;
}
/*
* We're switching command submission mechanism,
* or cannot simply rely on the hardware serializing for us.
* Insert a driver-dependant barrier or wait for buffer idle.
*/
if ((fence_class != bo->fence_class) ||
((ftype ^ bo->fence_type) & bo->fence_type)) {
ret = -EINVAL;
if (driver->command_stream_barrier) {
ret = driver->command_stream_barrier(bo,
fence_class,
ftype,
no_wait);
}
if (ret && ret != -EAGAIN)
ret = drm_bo_wait(bo, 0, 1, no_wait, 1);
if (ret)
return ret;
}
bo->new_fence_class = fence_class;
bo->new_fence_type = ftype;
/*
* Check whether we need to move buffer.
*/
*move_buffer = 0;
if (!drm_bo_mem_compat(&bo->mem)) {
*move_buffer = 1;
ret = drm_bo_wait(bo, 0, 1, no_wait, 1);
}
return ret;
}
/**
* drm_bo_do_validate:
*
* @bo: the buffer object
*
* @flags: access rights, mapping parameters and cacheability. See
* the DRM_BO_FLAG_* values in drm.h
*
* @mask: Which flag values to change; this allows callers to modify
* things without knowing the current state of other flags.
*
* @hint: changes the proceedure for this operation, see the DRM_BO_HINT_*
* values in drm.h.
*
* @fence_class: a driver-specific way of doing fences. Presumably,
* this would be used if the driver had more than one submission and
* fencing mechanism. At this point, there isn't any use of this
* from the user mode code.
*
* @rep: To be stuffed with the reply from validation
*
* 'validate' a buffer object. This changes where the buffer is
* located, along with changing access modes.
*/
int drm_bo_do_validate(struct drm_buffer_object *bo,
uint64_t flags, uint64_t mask, uint32_t hint,
uint32_t fence_class)
{
int ret;
int no_wait = (hint & DRM_BO_HINT_DONT_BLOCK) != 0;
int move_buffer;
mutex_lock(&bo->mutex);
do {
bo->priv_flags &= ~_DRM_BO_FLAG_UNLOCKED;
ret = drm_bo_prepare_for_validate(bo, flags, mask, hint,
fence_class, no_wait,
&move_buffer);
if (ret)
goto out;
} while(unlikely(bo->priv_flags & _DRM_BO_FLAG_UNLOCKED));
ret = drm_buffer_object_validate(bo,
fence_class,
!(hint & DRM_BO_HINT_DONT_FENCE),
no_wait,
move_buffer);
BUG_ON(bo->priv_flags & _DRM_BO_FLAG_UNLOCKED);
out:
mutex_unlock(&bo->mutex);
return ret;
}
EXPORT_SYMBOL(drm_bo_do_validate);
int drm_buffer_object_create(struct drm_device *dev,
unsigned long size,
enum drm_bo_type type,
uint64_t flags,
uint32_t hint,
uint32_t page_alignment,
unsigned long buffer_start,
struct drm_buffer_object **buf_obj)
{
struct drm_buffer_manager *bm = &dev->bm;
struct drm_buffer_object *bo;
int ret = 0;
unsigned long num_pages;
size += buffer_start & ~PAGE_MASK;
num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (num_pages == 0) {
DRM_ERROR("Illegal buffer object size %ld.\n", size);
return -EINVAL;
}
bo = drm_ctl_calloc(1, sizeof(*bo), DRM_MEM_BUFOBJ);
if (!bo)
return -ENOMEM;
mutex_init(&bo->mutex);
mutex_lock(&bo->mutex);
atomic_set(&bo->usage, 1);
atomic_set(&bo->mapped, 0);
DRM_INIT_WAITQUEUE(&bo->event_queue);
INIT_LIST_HEAD(&bo->lru);
INIT_LIST_HEAD(&bo->pinned_lru);
INIT_LIST_HEAD(&bo->ddestroy);
#ifdef DRM_ODD_MM_COMPAT
INIT_LIST_HEAD(&bo->p_mm_list);
INIT_LIST_HEAD(&bo->vma_list);
#endif
bo->dev = dev;
bo->type = type;
bo->num_pages = num_pages;
bo->mem.mem_type = DRM_BO_MEM_LOCAL;
bo->mem.num_pages = bo->num_pages;
bo->mem.mm_node = NULL;
bo->mem.page_alignment = page_alignment;
bo->buffer_start = buffer_start & PAGE_MASK;
bo->priv_flags = 0;
bo->mem.flags = (DRM_BO_FLAG_MEM_LOCAL | DRM_BO_FLAG_CACHED |
DRM_BO_FLAG_MAPPABLE);
bo->mem.proposed_flags = 0;
atomic_inc(&bm->count);
/*
* Use drm_bo_modify_proposed_flags to error-check the proposed flags
*/
ret = drm_bo_modify_proposed_flags (bo, flags, flags);
if (ret)
goto out_err;
/*
* For drm_bo_type_device buffers, allocate
* address space from the device so that applications
* can mmap the buffer from there
*/
if (bo->type == drm_bo_type_device) {
mutex_lock(&dev->struct_mutex);
ret = drm_bo_setup_vm_locked(bo);
mutex_unlock(&dev->struct_mutex);
if (ret)
goto out_err;
}
mutex_unlock(&bo->mutex);
ret = drm_bo_do_validate(bo, 0, 0, hint | DRM_BO_HINT_DONT_FENCE,
0);
if (ret)
goto out_err_unlocked;
*buf_obj = bo;
return 0;
out_err:
mutex_unlock(&bo->mutex);
out_err_unlocked:
drm_bo_usage_deref_unlocked(&bo);
return ret;
}
EXPORT_SYMBOL(drm_buffer_object_create);
static int drm_bo_leave_list(struct drm_buffer_object *bo,
uint32_t mem_type,
int free_pinned,
int allow_errors)
{
struct drm_device *dev = bo->dev;
int ret = 0;
mutex_lock(&bo->mutex);
ret = drm_bo_expire_fence(bo, allow_errors);
if (ret)
goto out;
if (free_pinned) {
DRM_FLAG_MASKED(bo->mem.flags, 0, DRM_BO_FLAG_NO_MOVE);
mutex_lock(&dev->struct_mutex);
list_del_init(&bo->pinned_lru);
if (bo->pinned_node == bo->mem.mm_node)
bo->pinned_node = NULL;
if (bo->pinned_node != NULL) {
drm_memrange_put_block(bo->pinned_node);
bo->pinned_node = NULL;
}
mutex_unlock(&dev->struct_mutex);
}
if (bo->mem.flags & DRM_BO_FLAG_NO_EVICT) {
DRM_ERROR("A DRM_BO_NO_EVICT buffer present at "
"cleanup. Removing flag and evicting.\n");
bo->mem.flags &= ~DRM_BO_FLAG_NO_EVICT;
bo->mem.proposed_flags &= ~DRM_BO_FLAG_NO_EVICT;
}
if (bo->mem.mem_type == mem_type)
ret = drm_bo_evict(bo, mem_type, 0);
if (ret) {
if (allow_errors) {
goto out;
} else {
ret = 0;
DRM_ERROR("Cleanup eviction failed\n");
}
}
out:
mutex_unlock(&bo->mutex);
return ret;
}
static struct drm_buffer_object *drm_bo_entry(struct list_head *list,
int pinned_list)
{
if (pinned_list)
return list_entry(list, struct drm_buffer_object, pinned_lru);
else
return list_entry(list, struct drm_buffer_object, lru);
}
/*
* dev->struct_mutex locked.
*/
static int drm_bo_force_list_clean(struct drm_device *dev,
struct list_head *head,
unsigned mem_type,
int free_pinned,
int allow_errors,
int pinned_list)
{
struct list_head *list, *next, *prev;
struct drm_buffer_object *entry, *nentry;
int ret;
int do_restart;
/*
* The list traversal is a bit odd here, because an item may
* disappear from the list when we release the struct_mutex or
* when we decrease the usage count. Also we're not guaranteed
* to drain pinned lists, so we can't always restart.
*/
restart:
nentry = NULL;
list_for_each_safe(list, next, head) {
prev = list->prev;
entry = (nentry != NULL) ? nentry: drm_bo_entry(list, pinned_list);
atomic_inc(&entry->usage);
if (nentry) {
atomic_dec(&nentry->usage);
nentry = NULL;
}
/*
* Protect the next item from destruction, so we can check
* its list pointers later on.
*/
if (next != head) {
nentry = drm_bo_entry(next, pinned_list);
atomic_inc(&nentry->usage);
}
mutex_unlock(&dev->struct_mutex);
ret = drm_bo_leave_list(entry, mem_type, free_pinned,
allow_errors);
mutex_lock(&dev->struct_mutex);
drm_bo_usage_deref_locked(&entry);
if (ret)
return ret;
/*
* Has the next item disappeared from the list?
*/
do_restart = ((next->prev != list) && (next->prev != prev));
if (nentry != NULL && do_restart)
drm_bo_usage_deref_locked(&nentry);
if (do_restart)
goto restart;
}
return 0;
}
int drm_bo_clean_mm(struct drm_device *dev, unsigned mem_type, int kern_clean)
{
struct drm_buffer_manager *bm = &dev->bm;
struct drm_mem_type_manager *man = &bm->man[mem_type];
int ret = -EINVAL;
if (mem_type >= DRM_BO_MEM_TYPES) {
DRM_ERROR("Illegal memory type %d\n", mem_type);
return ret;
}
if (!man->has_type) {
DRM_ERROR("Trying to take down uninitialized "
"memory manager type %u\n", mem_type);
return ret;
}
if ((man->kern_init_type) && (kern_clean == 0)) {
DRM_ERROR("Trying to take down kernel initialized "
"memory manager type %u\n", mem_type);
return -EPERM;
}
man->use_type = 0;
man->has_type = 0;
ret = 0;
if (mem_type > 0) {
BUG_ON(!list_empty(&bm->unfenced));
drm_bo_force_list_clean(dev, &man->lru, mem_type, 1, 0, 0);
drm_bo_force_list_clean(dev, &man->pinned, mem_type, 1, 0, 1);
if (drm_memrange_clean(&man->manager)) {
drm_memrange_takedown(&man->manager);
} else {
ret = -EBUSY;
}
}
return ret;
}
EXPORT_SYMBOL(drm_bo_clean_mm);
/**
*Evict all buffers of a particular mem_type, but leave memory manager
*regions for NO_MOVE buffers intact. New buffers cannot be added at this
*point since we have the hardware lock.
*/
int drm_bo_lock_mm(struct drm_device *dev, unsigned mem_type)
{
int ret;
struct drm_buffer_manager *bm = &dev->bm;
struct drm_mem_type_manager *man = &bm->man[mem_type];
if (mem_type == 0 || mem_type >= DRM_BO_MEM_TYPES) {
DRM_ERROR("Illegal memory manager memory type %u.\n", mem_type);
return -EINVAL;
}
if (!man->has_type) {
DRM_ERROR("Memory type %u has not been initialized.\n",
mem_type);
return 0;
}
ret = drm_bo_force_list_clean(dev, &man->lru, mem_type, 0, 1, 0);
if (ret)
return ret;
ret = drm_bo_force_list_clean(dev, &man->pinned, mem_type, 0, 1, 1);
return ret;
}
int drm_bo_init_mm(struct drm_device *dev, unsigned type,
unsigned long p_offset, unsigned long p_size,
int kern_init)
{
struct drm_buffer_manager *bm = &dev->bm;
int ret = -EINVAL;
struct drm_mem_type_manager *man;
if (type >= DRM_BO_MEM_TYPES) {
DRM_ERROR("Illegal memory type %d\n", type);
return ret;
}
man = &bm->man[type];
if (man->has_type) {
DRM_ERROR("Memory manager already initialized for type %d\n",
type);
return ret;
}
ret = dev->driver->bo_driver->init_mem_type(dev, type, man);
if (ret)
return ret;
ret = 0;
if (type != DRM_BO_MEM_LOCAL) {
if (!p_size) {
DRM_ERROR("Zero size memory manager type %d\n", type);
return ret;
}
ret = drm_memrange_init(&man->manager, p_offset, p_size);
if (ret)
return ret;
}
man->has_type = 1;
man->use_type = 1;
man->kern_init_type = kern_init;
man->size = p_size;
INIT_LIST_HEAD(&man->lru);
INIT_LIST_HEAD(&man->pinned);
return 0;
}
EXPORT_SYMBOL(drm_bo_init_mm);
/*
* This function is intended to be called on drm driver unload.
* If you decide to call it from lastclose, you must protect the call
* from a potentially racing drm_bo_driver_init in firstopen.
* (This may happen on X server restart).
*/
int drm_bo_driver_finish(struct drm_device *dev)
{
struct drm_buffer_manager *bm = &dev->bm;
int ret = 0;
unsigned i = DRM_BO_MEM_TYPES;
struct drm_mem_type_manager *man;
mutex_lock(&dev->struct_mutex);
if (!bm->initialized)
goto out;
bm->initialized = 0;
while (i--) {
man = &bm->man[i];
if (man->has_type) {
man->use_type = 0;
if ((i != DRM_BO_MEM_LOCAL) && drm_bo_clean_mm(dev, i, 1)) {
ret = -EBUSY;
DRM_ERROR("DRM memory manager type %d "
"is not clean.\n", i);
}
man->has_type = 0;
}
}
mutex_unlock(&dev->struct_mutex);
if (!cancel_delayed_work(&bm->wq))
flush_scheduled_work();
mutex_lock(&dev->struct_mutex);
drm_bo_delayed_delete(dev, 1);
if (list_empty(&bm->ddestroy))
DRM_DEBUG("Delayed destroy list was clean\n");
if (list_empty(&bm->man[0].lru))
DRM_DEBUG("Swap list was clean\n");
if (list_empty(&bm->man[0].pinned))
DRM_DEBUG("NO_MOVE list was clean\n");
if (list_empty(&bm->unfenced))
DRM_DEBUG("Unfenced list was clean\n");
if (bm->dummy_read_page) {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
ClearPageReserved(bm->dummy_read_page);
#endif
__free_page(bm->dummy_read_page);
}
out:
mutex_unlock(&dev->struct_mutex);
return ret;
}
EXPORT_SYMBOL(drm_bo_driver_finish);
/*
* This function is intended to be called on drm driver load.
* If you decide to call it from firstopen, you must protect the call
* from a potentially racing drm_bo_driver_finish in lastclose.
* (This may happen on X server restart).
*/
int drm_bo_driver_init(struct drm_device *dev)
{
struct drm_bo_driver *driver = dev->driver->bo_driver;
struct drm_buffer_manager *bm = &dev->bm;
int ret = -EINVAL;
bm->dummy_read_page = NULL;
mutex_lock(&dev->struct_mutex);
if (!driver)
goto out_unlock;
bm->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
if (!bm->dummy_read_page) {
ret = -ENOMEM;
goto out_unlock;
}
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
SetPageReserved(bm->dummy_read_page);
#endif
/*
* Initialize the system memory buffer type.
* Other types need to be driver / IOCTL initialized.
*/
ret = drm_bo_init_mm(dev, DRM_BO_MEM_LOCAL, 0, 0, 1);
if (ret) {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15))
ClearPageReserved(bm->dummy_read_page);
#endif
__free_page(bm->dummy_read_page);
bm->dummy_read_page = NULL;
goto out_unlock;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
INIT_WORK(&bm->wq, &drm_bo_delayed_workqueue, dev);
#else
INIT_DELAYED_WORK(&bm->wq, drm_bo_delayed_workqueue);
#endif
bm->initialized = 1;
bm->nice_mode = 1;
atomic_set(&bm->count, 0);
bm->cur_pages = 0;
INIT_LIST_HEAD(&bm->unfenced);
INIT_LIST_HEAD(&bm->ddestroy);
out_unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
EXPORT_SYMBOL(drm_bo_driver_init);
/*
* buffer object vm functions.
*/
int drm_mem_reg_is_pci(struct drm_device *dev, struct drm_bo_mem_reg *mem)
{
struct drm_buffer_manager *bm = &dev->bm;
struct drm_mem_type_manager *man = &bm->man[mem->mem_type];
if (!(man->flags & _DRM_FLAG_MEMTYPE_FIXED)) {
if (mem->mem_type == DRM_BO_MEM_LOCAL)
return 0;
if (man->flags & _DRM_FLAG_MEMTYPE_CMA)
return 0;
if (mem->flags & DRM_BO_FLAG_CACHED)
return 0;
}
return 1;
}
EXPORT_SYMBOL(drm_mem_reg_is_pci);
/**
* \c Get the PCI offset for the buffer object memory.
*
* \param bo The buffer object.
* \param bus_base On return the base of the PCI region
* \param bus_offset On return the byte offset into the PCI region
* \param bus_size On return the byte size of the buffer object or zero if
* the buffer object memory is not accessible through a PCI region.
* \return Failure indication.
*
* Returns -EINVAL if the buffer object is currently not mappable.
* Otherwise returns zero.
*/
int drm_bo_pci_offset(struct drm_device *dev,
struct drm_bo_mem_reg *mem,
unsigned long *bus_base,
unsigned long *bus_offset, unsigned long *bus_size)
{
struct drm_buffer_manager *bm = &dev->bm;
struct drm_mem_type_manager *man = &bm->man[mem->mem_type];
*bus_size = 0;
if (!(man->flags & _DRM_FLAG_MEMTYPE_MAPPABLE))
return -EINVAL;
if (drm_mem_reg_is_pci(dev, mem)) {
*bus_offset = mem->mm_node->start << PAGE_SHIFT;
*bus_size = mem->num_pages << PAGE_SHIFT;
*bus_base = man->io_offset;
}
return 0;
}
/**
* \c Kill all user-space virtual mappings of this buffer object.
*
* \param bo The buffer object.
*
* Call bo->mutex locked.
*/
void drm_bo_unmap_virtual(struct drm_buffer_object *bo)
{
struct drm_device *dev = bo->dev;
loff_t offset = ((loff_t) bo->map_list.hash.key) << PAGE_SHIFT;
loff_t holelen = ((loff_t) bo->mem.num_pages) << PAGE_SHIFT;
if (!dev->dev_mapping)
return;
unmap_mapping_range(dev->dev_mapping, offset, holelen, 1);
}
/**
* drm_bo_takedown_vm_locked:
*
* @bo: the buffer object to remove any drm device mapping
*
* Remove any associated vm mapping on the drm device node that
* would have been created for a drm_bo_type_device buffer
*/
void drm_bo_takedown_vm_locked(struct drm_buffer_object *bo)
{
struct drm_map_list *list;
drm_local_map_t *map;
struct drm_device *dev = bo->dev;
DRM_ASSERT_LOCKED(&dev->struct_mutex);
if (bo->type != drm_bo_type_device)
return;
list = &bo->map_list;
if (list->user_token) {
drm_ht_remove_item(&dev->map_hash, &list->hash);
list->user_token = 0;
}
if (list->file_offset_node) {
drm_memrange_put_block(list->file_offset_node);
list->file_offset_node = NULL;
}
map = list->map;
if (!map)
return;
drm_ctl_free(map, sizeof(*map), DRM_MEM_BUFOBJ);
list->map = NULL;
list->user_token = 0ULL;
drm_bo_usage_deref_locked(&bo);
}
EXPORT_SYMBOL(drm_bo_takedown_vm_locked);
/**
* drm_bo_setup_vm_locked:
*
* @bo: the buffer to allocate address space for
*
* Allocate address space in the drm device so that applications
* can mmap the buffer and access the contents. This only
* applies to drm_bo_type_device objects as others are not
* placed in the drm device address space.
*/
static int drm_bo_setup_vm_locked(struct drm_buffer_object *bo)
{
struct drm_map_list *list = &bo->map_list;
drm_local_map_t *map;
struct drm_device *dev = bo->dev;
DRM_ASSERT_LOCKED(&dev->struct_mutex);
list->map = drm_ctl_calloc(1, sizeof(*map), DRM_MEM_BUFOBJ);
if (!list->map)
return -ENOMEM;
map = list->map;
map->offset = 0;
map->type = _DRM_TTM;
map->flags = _DRM_REMOVABLE;
map->size = bo->mem.num_pages * PAGE_SIZE;
atomic_inc(&bo->usage);
map->handle = (void *)bo;
list->file_offset_node = drm_memrange_search_free(&dev->offset_manager,
bo->mem.num_pages, 0, 0);
if (unlikely(!list->file_offset_node)) {
drm_bo_takedown_vm_locked(bo);
return -ENOMEM;
}
list->file_offset_node = drm_memrange_get_block(list->file_offset_node,
bo->mem.num_pages, 0);
if (unlikely(!list->file_offset_node)) {
drm_bo_takedown_vm_locked(bo);
return -ENOMEM;
}
list->hash.key = list->file_offset_node->start;
if (drm_ht_insert_item(&dev->map_hash, &list->hash)) {
drm_bo_takedown_vm_locked(bo);
return -ENOMEM;
}
list->user_token = ((uint64_t) list->hash.key) << PAGE_SHIFT;
return 0;
}
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