/**************************************************************************
*
* 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(drm_buffer_object_t * bo);
static int drm_bo_setup_vm_locked(drm_buffer_object_t * bo);
static void drm_bo_takedown_vm_locked(drm_buffer_object_t * bo);
static void drm_bo_unmap_virtual(drm_buffer_object_t * bo);
static inline uint32_t drm_bo_type_flags(unsigned type)
{
return (1 << (24 + type));
}
/*
* bo locked. dev->struct_mutex locked.
*/
void drm_bo_add_to_pinned_lru(drm_buffer_object_t * bo)
{
drm_mem_type_manager_t *man;
man = &bo->dev->bm.man[bo->pinned_mem_type];
list_add_tail(&bo->pinned_lru, &man->pinned);
}
void drm_bo_add_to_lru(drm_buffer_object_t * bo)
{
drm_mem_type_manager_t *man;
if (!(bo->mem.mask & (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(drm_buffer_object_t * 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(drm_buffer_object_t * 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.
*/
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