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/**************************************************************************
*
* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., 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 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*
**************************************************************************/
/*
* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
*/
#include "drmP.h"
/*
* Buffer object locking policy:
* Lock dev->struct_mutex;
* Increase usage
* Unlock dev->struct_mutex;
* Lock buffer->mutex;
* Do whatever you want;
* Unlock buffer->mutex;
* Decrease usage. Call destruction if zero.
*
* User object visibility ups usage just once, since it has its own
* refcounting.
*
* Destruction:
* lock dev->struct_mutex;
* Verify that usage is zero. Otherwise unlock and continue.
* Destroy object.
* unlock dev->struct_mutex;
*
* Mutex and spinlock locking orders:
* 1.) Buffer mutex
* 2.) Refer to ttm locking orders.
*/
int drm_fence_buffer_objects(drm_file_t *priv)
{
drm_device_t *dev = priv->head->dev;
drm_buffer_manager_t *bm = &dev->bm;
drm_buffer_object_t *entry, *next;
uint32_t fence_flags = 0;
int count = 0;
drm_fence_object_t *fence;
int ret;
mutex_lock(&bm->bm_mutex);
list_for_each_entry(entry, &bm->unfenced, head) {
BUG_ON(!entry->unfenced);
fence_flags |= entry->fence_flags;
count++;
}
if (!count) {
mutex_unlock(&bm->bm_mutex);
return 0;
}
fence = drm_calloc(1, sizeof(*fence), DRM_MEM_FENCE);
if (!fence) {
mutex_unlock(&bm->bm_mutex);
return -ENOMEM;
}
ret = drm_fence_object_init(dev, fence_flags, 1, fence);
if (ret) {
drm_free(fence, sizeof(*fence), DRM_MEM_FENCE);
mutex_unlock(&bm->bm_mutex);
return ret;
}
list_for_each_entry_safe(entry, next, &bm->unfenced, head) {
BUG_ON(entry->fence);
entry->unfenced = 0;
entry->fence = fence;
list_del_init(&entry->head);
if (!(entry->flags & DRM_BO_FLAG_NO_EVICT)) {
if (entry->flags & DRM_BO_FLAG_MEM_TT) {
list_add_tail(&entry->head, &bm->tt_lru);
} else if (entry->flags & DRM_BO_FLAG_MEM_VRAM) {
list_add_tail(&entry->head, &bm->vram_lru);
}
}
}
mutex_lock(&dev->struct_mutex);
atomic_add(count - 1, &fence->usage);
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&bm->bm_mutex);
return 0;
}
/*
* bm locked,
* dev locked.
*/
static int drm_move_tt_to_local(drm_buffer_object_t *buf, int lazy)
{
drm_device_t *dev = buf->dev;
drm_buffer_manager_t *bm = &dev->bm;
int ret = 0;
BUG_ON(!buf->tt);
if (buf->fence) {
ret = drm_fence_object_wait(dev, buf->fence, lazy, !lazy,
buf->fence_flags);
if (ret)
return ret;
drm_fence_usage_deref_unlocked(dev, buf->fence);
buf->fence = NULL;
}
drm_unbind_ttm_region(buf->ttm_region);
drm_mm_put_block(&bm->tt_manager, buf->tt);
buf->tt = NULL;
buf->flags &= ~(DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_UNCACHED);
buf->flags |= DRM_BO_FLAG_MEM_LOCAL;
return 0;
}
void destroy_buffer_object(drm_device_t *dev, drm_buffer_object_t *bo)
{
drm_buffer_manager_t *bm = &dev->bm;
BUG_ON(bo->unfenced);
if (bo->fence) {
if (!drm_fence_object_signaled(bo->fence, bo->fence_flags)) {
drm_fence_object_flush(dev, bo->fence, bo->fence_flags);
list_add_tail(&bo->ddestroy, &bm->ddestroy);
return;
} else {
drm_fence_usage_deref_locked(dev, bo->fence);
bo->fence = NULL;
}
}
/*
* Take away from lru lists.
*/
list_del_init(&bo->head);
if (bo->tt) {
int ret;
ret = drm_move_tt_to_local(bo, 0);
BUG_ON(ret);
}
if (bo->vram) {
drm_mm_put_block(&bm->vram_manager, bo->vram);
bo->vram = NULL;
}
/*
* FIXME: Destroy ttm.
*/
drm_free(bo, sizeof(*bo), DRM_MEM_BUFOBJ);
}
static int drm_bo_new_flags(uint32_t flags, uint32_t new_mask, uint32_t hint,
int init, uint32_t *n_flags)
{
uint32_t new_flags;
uint32_t new_props;
if (!(flags & new_mask & DRM_BO_MASK_MEM) || init) {
/*
* We need to move memory. Default preferences are hard-coded
* here.
*/
new_flags = new_mask & DRM_BO_MASK_MEM;
if (!new_flags) {
DRM_ERROR("Invalid buffer object memory flags\n");
return -EINVAL;
}
if (new_flags & DRM_BO_FLAG_MEM_LOCAL) {
if ((hint & DRM_BO_HINT_AVOID_LOCAL) &&
new_flags & (DRM_BO_FLAG_MEM_VRAM | DRM_BO_FLAG_MEM_TT)) {
new_flags &= ~DRM_BO_FLAG_MEM_LOCAL;
} else {
new_flags = DRM_BO_FLAG_MEM_LOCAL;
}
}
if (new_flags & DRM_BO_FLAG_MEM_TT) {
if ((hint & DRM_BO_HINT_PREFER_VRAM) &&
new_flags & DRM_BO_FLAG_MEM_VRAM) {
new_flags = DRM_BO_FLAG_MEM_VRAM;
} else {
new_flags = DRM_BO_FLAG_MEM_TT;
}
}
} else {
new_flags = flags & DRM_BO_MASK_MEM;
}
new_props = new_mask & (DRM_BO_FLAG_EXE | DRM_BO_FLAG_WRITE |
DRM_BO_FLAG_READ);
if (!new_props) {
DRM_ERROR("Invalid buffer object rwx properties\n");
return -EINVAL;
}
new_flags |= new_mask & ~DRM_BO_MASK_MEM;
*n_flags = new_flags;
return 0;
}
#if 0
static int drm_bo_evict(drm_device_t *dev, drm_buffer_object_t *buf, int tt);
{
int ret;
if (tt) {
ret = drm_move_tt_to_local(buf);
} else {
ret = drm_move_vram_to_local(buf);
}
return ret;
}
int drm_bo_alloc_space(drm_device_t *dev, int tt, drm_buffer_object_t *buf)
{
drm_mm_node_t *node;
drm_buffer_manager_t *bm = &dev->bm;
drm_buffer_object_t *bo;
drm_mm_t *mm = (tt) ? &bm->tt_manager : &bm->vram_manager;
lru = (tt) ? &bm->tt_lru : &bm->vram_lru;
do {
node = drm_mm_search_free(mm, size, 0, 1);
if (node)
break;
if (lru->next == lru)
break;
if (tt) {
bo = list_entry(lru->next, drm_buffer_object_t, tt_lru);
} else {
bo = list_entry(lru->next, drm_buffer_object_t, vram_lru);
}
drm_bo_evict(dev, bo, tt);
} while (1);
if (!node) {
DRM_ERROR("Out of aperture space\n");
return -ENOMEM;
}
node = drm_mm_get_block(node, size, 0);
BUG_ON(!node);
node->private = (void *)buf;
if (tt) {
buf->tt = node;
} else {
buf->vram = node;
}
return 0;
}
#endif
/*
* Call dev->struct_mutex locked.
*/
drm_buffer_object_t *drm_lookup_buffer_object(drm_file_t *priv, uint32_t handle,
int check_owner)
{
drm_user_object_t *uo;
drm_buffer_object_t *bo;
uo = drm_lookup_user_object(priv, handle);
if (!uo || (uo->type != drm_buffer_type))
return NULL;
if (check_owner && priv != uo->owner) {
if (!drm_lookup_ref_object(priv, uo, _DRM_REF_USE))
return NULL;
}
bo = drm_user_object_entry(uo, drm_buffer_object_t, base);
atomic_inc(&bo->usage);
return bo;
}
/*
* Call bo->mutex locked.
* Wait until the buffer is idle.
*/
static int drm_bo_wait(drm_device_t *dev, drm_buffer_object_t *bo, int lazy)
{
drm_fence_object_t *fence = bo->fence;
int ret;
if (fence) {
if (drm_fence_object_signaled(fence, bo->fence_flags)) {
drm_fence_usage_deref_unlocked(dev, fence);
bo->fence = NULL;
return 0;
}
/*
* Make sure another process doesn't destroy the fence
* object when we release the buffer object mutex.
* We don't need to take the dev->struct_mutex lock here,
* since the fence usage count is at least 1 already.
*/
atomic_inc(&fence->usage);
mutex_unlock(&bo->mutex);
ret = drm_fence_object_wait(dev, fence, lazy, !lazy, bo->fence_flags);
mutex_lock(&bo->mutex);
if (ret)
return ret;
mutex_lock(&dev->struct_mutex);
drm_fence_usage_deref_locked(dev, fence);
if (bo->fence == fence) {
drm_fence_usage_deref_locked(dev, fence);
bo->fence = NULL;
}
mutex_unlock(&dev->struct_mutex);
}
return 0;
}
/*
* Call bo->mutex locked.
* Returns 1 if the buffer is currently rendered to or from. 0 otherwise.
*/
static int drm_bo_busy(drm_device_t *dev, drm_buffer_object_t *bo)
{
drm_fence_object_t *fence = bo->fence;
if (fence) {
if (drm_fence_object_signaled(fence, bo->fence_flags)) {
drm_fence_usage_deref_unlocked(dev, fence);
bo->fence = NULL;
return 0;
}
drm_fence_object_flush(dev, fence, DRM_FENCE_EXE);
if (drm_fence_object_signaled(fence, bo->fence_flags)) {
drm_fence_usage_deref_unlocked(dev, fence);
bo->fence = NULL;
return 0;
}
return 1;
}
return 0;
}
/*
* Wait for buffer idle and register that we've mapped the buffer.
*/
static int drm_buffer_object_map(drm_file_t *priv, uint32_t handle, int wait)
{
drm_buffer_object_t *bo;
drm_device_t *dev = priv->head->dev;
int ret;
mutex_lock(&dev->struct_mutex);
bo = drm_lookup_buffer_object(priv, handle, 1);
mutex_unlock(&dev->struct_mutex);
if (!bo)
return -EINVAL;
mutex_lock(&bo->mutex);
if (!wait) {
if ((atomic_read(&bo->mapped) == 0) &&
drm_bo_busy(dev, bo)) {
mutex_unlock(&bo->mutex);
return -EBUSY;
}
} else {
ret = drm_bo_wait(dev, bo, 0);
if (ret) {
mutex_unlock(&bo->mutex);
return -EBUSY;
}
}
mutex_lock(&dev->struct_mutex);
ret = drm_add_ref_object(priv, &bo->base, _DRM_REF_TYPE1);
mutex_unlock(&dev->struct_mutex);
if (!ret) {
atomic_inc(&bo->mapped);
}
mutex_unlock(&bo->mutex);
return ret;
}
int drm_bo_ioctl(DRM_IOCTL_ARGS)
{
DRM_DEVICE;
drm_bo_arg_t arg;
drm_bo_arg_request_t *req = &arg.req;
drm_bo_arg_reply_t rep;
unsigned long next;
drm_user_object_t *uo;
drm_buffer_object_t *entry;
do {
DRM_COPY_FROM_USER_IOCTL(arg, (void __user *)data, sizeof(arg));
rep.ret = 0;
rep.handled = 0;
switch (req->op) {
case drm_bo_map:
rep.ret = drm_buffer_object_map(priv, req->handle,
!(req->hint &
DRM_BO_HINT_DONT_BLOCK));
break;
case drm_bo_destroy:
mutex_lock(&dev->struct_mutex);
uo = drm_lookup_user_object(priv, req->handle);
if (!uo || (uo->type != drm_buffer_type) || uo->owner != priv) {
mutex_unlock(&dev->struct_mutex);
rep.ret = -EINVAL;
break;
}
rep.ret = drm_remove_user_object(priv, uo);
mutex_unlock(&dev->struct_mutex);
break;
case drm_bo_reference:
rep.ret = drm_user_object_ref(priv, req->handle,
drm_buffer_type, &uo);
if (rep.ret)
break;
mutex_lock(&dev->struct_mutex);
uo = drm_lookup_user_object(priv, req->handle);
entry = drm_user_object_entry(uo, drm_buffer_object_t, base);
atomic_dec(&entry->usage);
mutex_unlock(&dev->struct_mutex);
break;
case drm_bo_unreference:
rep.ret = drm_user_object_unref(priv, req->handle,
drm_buffer_type);
break;
default:
rep.ret = -EINVAL;
}
next = drm_ul(req->next);
rep.handled = 1;
arg.rep = rep;
DRM_COPY_TO_USER_IOCTL((void __user *)data, arg, sizeof(arg));
data = next;
} while (data);
return 0;
}
|