510 lines
11 KiB
C
510 lines
11 KiB
C
/**************************************************************************
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*
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* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
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*/
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#include "drmP.h"
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/*
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* Buffer object locking policy:
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* Lock dev->struct_mutex;
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* Increase usage
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* Unlock dev->struct_mutex;
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* Lock buffer->mutex;
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* Do whatever you want;
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* Unlock buffer->mutex;
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* Decrease usage. Call destruction if zero.
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*
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* User object visibility ups usage just once, since it has its own
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* refcounting.
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*
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* Destruction:
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* lock dev->struct_mutex;
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* Verify that usage is zero. Otherwise unlock and continue.
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* Destroy object.
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* unlock dev->struct_mutex;
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*
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* Mutex and spinlock locking orders:
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* 1.) Buffer mutex
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* 2.) Refer to ttm locking orders.
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*/
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int drm_fence_buffer_objects(drm_file_t *priv)
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{
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drm_device_t *dev = priv->head->dev;
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drm_buffer_manager_t *bm = &dev->bm;
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drm_buffer_object_t *entry, *next;
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uint32_t fence_flags = 0;
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int count = 0;
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drm_fence_object_t *fence;
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int ret;
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mutex_lock(&bm->bm_mutex);
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list_for_each_entry(entry, &bm->unfenced, head) {
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BUG_ON(!entry->unfenced);
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fence_flags |= entry->fence_flags;
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count++;
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}
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if (!count) {
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mutex_unlock(&bm->bm_mutex);
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return 0;
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}
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fence = drm_calloc(1, sizeof(*fence), DRM_MEM_FENCE);
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if (!fence) {
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mutex_unlock(&bm->bm_mutex);
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return -ENOMEM;
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}
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ret = drm_fence_object_init(dev, fence_flags, 1, fence);
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if (ret) {
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drm_free(fence, sizeof(*fence), DRM_MEM_FENCE);
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mutex_unlock(&bm->bm_mutex);
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return ret;
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}
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list_for_each_entry_safe(entry, next, &bm->unfenced, head) {
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BUG_ON(entry->fence);
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entry->unfenced = 0;
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entry->fence = fence;
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list_del_init(&entry->head);
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if (!(entry->flags & DRM_BO_FLAG_NO_EVICT)) {
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if (entry->flags & DRM_BO_FLAG_MEM_TT) {
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list_add_tail(&entry->head, &bm->tt_lru);
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} else if (entry->flags & DRM_BO_FLAG_MEM_VRAM) {
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list_add_tail(&entry->head, &bm->vram_lru);
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}
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}
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}
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mutex_lock(&dev->struct_mutex);
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atomic_add(count - 1, &fence->usage);
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mutex_unlock(&dev->struct_mutex);
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mutex_unlock(&bm->bm_mutex);
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return 0;
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}
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/*
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* bm locked,
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* dev locked.
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*/
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static int drm_move_tt_to_local(drm_buffer_object_t *buf, int lazy)
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{
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drm_device_t *dev = buf->dev;
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drm_buffer_manager_t *bm = &dev->bm;
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int ret = 0;
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BUG_ON(!buf->tt);
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if (buf->fence) {
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ret = drm_fence_object_wait(dev, buf->fence, lazy, !lazy,
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buf->fence_flags);
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if (ret)
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return ret;
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drm_fence_usage_deref_unlocked(dev, buf->fence);
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buf->fence = NULL;
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}
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drm_unbind_ttm_region(buf->ttm_region);
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drm_mm_put_block(&bm->tt_manager, buf->tt);
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buf->tt = NULL;
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buf->flags &= ~(DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_UNCACHED);
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buf->flags |= DRM_BO_FLAG_MEM_LOCAL;
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return 0;
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}
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void destroy_buffer_object(drm_device_t *dev, drm_buffer_object_t *bo)
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{
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drm_buffer_manager_t *bm = &dev->bm;
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BUG_ON(bo->unfenced);
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if (bo->fence) {
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if (!drm_fence_object_signaled(bo->fence, bo->fence_flags)) {
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drm_fence_object_flush(dev, bo->fence, bo->fence_flags);
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list_add_tail(&bo->ddestroy, &bm->ddestroy);
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return;
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} else {
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drm_fence_usage_deref_locked(dev, bo->fence);
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bo->fence = NULL;
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}
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}
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/*
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* Take away from lru lists.
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*/
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list_del_init(&bo->head);
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if (bo->tt) {
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int ret;
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ret = drm_move_tt_to_local(bo, 0);
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BUG_ON(ret);
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}
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if (bo->vram) {
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drm_mm_put_block(&bm->vram_manager, bo->vram);
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bo->vram = NULL;
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}
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/*
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* FIXME: Destroy ttm.
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*/
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drm_free(bo, sizeof(*bo), DRM_MEM_BUFOBJ);
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}
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static int drm_bo_new_flags(uint32_t flags, uint32_t new_mask, uint32_t hint,
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int init, uint32_t *n_flags)
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{
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uint32_t new_flags;
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uint32_t new_props;
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if (!(flags & new_mask & DRM_BO_MASK_MEM) || init) {
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/*
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* We need to move memory. Default preferences are hard-coded
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* here.
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*/
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new_flags = new_mask & DRM_BO_MASK_MEM;
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if (!new_flags) {
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DRM_ERROR("Invalid buffer object memory flags\n");
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return -EINVAL;
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}
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if (new_flags & DRM_BO_FLAG_MEM_LOCAL) {
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if ((hint & DRM_BO_HINT_AVOID_LOCAL) &&
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new_flags & (DRM_BO_FLAG_MEM_VRAM | DRM_BO_FLAG_MEM_TT)) {
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new_flags &= ~DRM_BO_FLAG_MEM_LOCAL;
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} else {
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new_flags = DRM_BO_FLAG_MEM_LOCAL;
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}
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}
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if (new_flags & DRM_BO_FLAG_MEM_TT) {
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if ((hint & DRM_BO_HINT_PREFER_VRAM) &&
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new_flags & DRM_BO_FLAG_MEM_VRAM) {
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new_flags = DRM_BO_FLAG_MEM_VRAM;
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} else {
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new_flags = DRM_BO_FLAG_MEM_TT;
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}
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}
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} else {
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new_flags = flags & DRM_BO_MASK_MEM;
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}
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new_props = new_mask & (DRM_BO_FLAG_EXE | DRM_BO_FLAG_WRITE |
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DRM_BO_FLAG_READ);
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if (!new_props) {
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DRM_ERROR("Invalid buffer object rwx properties\n");
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return -EINVAL;
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}
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new_flags |= new_mask & ~DRM_BO_MASK_MEM;
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*n_flags = new_flags;
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return 0;
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}
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#if 0
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static int drm_bo_evict(drm_device_t *dev, drm_buffer_object_t *buf, int tt);
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{
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int ret;
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if (tt) {
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ret = drm_move_tt_to_local(buf);
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} else {
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ret = drm_move_vram_to_local(buf);
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}
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return ret;
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}
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int drm_bo_alloc_space(drm_device_t *dev, int tt, drm_buffer_object_t *buf)
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{
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drm_mm_node_t *node;
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drm_buffer_manager_t *bm = &dev->bm;
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drm_buffer_object_t *bo;
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drm_mm_t *mm = (tt) ? &bm->tt_manager : &bm->vram_manager;
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lru = (tt) ? &bm->tt_lru : &bm->vram_lru;
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do {
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node = drm_mm_search_free(mm, size, 0, 1);
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if (node)
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break;
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if (lru->next == lru)
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break;
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if (tt) {
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bo = list_entry(lru->next, drm_buffer_object_t, tt_lru);
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} else {
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bo = list_entry(lru->next, drm_buffer_object_t, vram_lru);
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}
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drm_bo_evict(dev, bo, tt);
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} while (1);
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if (!node) {
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DRM_ERROR("Out of aperture space\n");
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return -ENOMEM;
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}
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node = drm_mm_get_block(node, size, 0);
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BUG_ON(!node);
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node->private = (void *)buf;
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if (tt) {
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buf->tt = node;
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} else {
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buf->vram = node;
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}
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return 0;
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}
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#endif
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/*
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* Call dev->struct_mutex locked.
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*/
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drm_buffer_object_t *drm_lookup_buffer_object(drm_file_t *priv, uint32_t handle,
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int check_owner)
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{
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drm_user_object_t *uo;
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drm_buffer_object_t *bo;
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uo = drm_lookup_user_object(priv, handle);
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if (!uo || (uo->type != drm_buffer_type))
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return NULL;
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if (check_owner && priv != uo->owner) {
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if (!drm_lookup_ref_object(priv, uo, _DRM_REF_USE))
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return NULL;
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}
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bo = drm_user_object_entry(uo, drm_buffer_object_t, base);
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atomic_inc(&bo->usage);
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return bo;
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}
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/*
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* Call bo->mutex locked.
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* Wait until the buffer is idle.
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*/
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static int drm_bo_wait(drm_device_t *dev, drm_buffer_object_t *bo, int lazy)
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{
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drm_fence_object_t *fence = bo->fence;
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int ret;
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if (fence) {
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if (drm_fence_object_signaled(fence, bo->fence_flags)) {
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drm_fence_usage_deref_unlocked(dev, fence);
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bo->fence = NULL;
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return 0;
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}
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/*
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* Make sure another process doesn't destroy the fence
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* object when we release the buffer object mutex.
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* We don't need to take the dev->struct_mutex lock here,
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* since the fence usage count is at least 1 already.
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*/
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atomic_inc(&fence->usage);
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mutex_unlock(&bo->mutex);
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ret = drm_fence_object_wait(dev, fence, lazy, !lazy, bo->fence_flags);
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mutex_lock(&bo->mutex);
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if (ret)
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return ret;
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mutex_lock(&dev->struct_mutex);
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drm_fence_usage_deref_locked(dev, fence);
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if (bo->fence == fence) {
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drm_fence_usage_deref_locked(dev, fence);
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bo->fence = NULL;
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}
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mutex_unlock(&dev->struct_mutex);
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}
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return 0;
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}
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/*
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* Call bo->mutex locked.
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* Returns 1 if the buffer is currently rendered to or from. 0 otherwise.
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*/
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static int drm_bo_busy(drm_device_t *dev, drm_buffer_object_t *bo)
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{
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drm_fence_object_t *fence = bo->fence;
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if (fence) {
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if (drm_fence_object_signaled(fence, bo->fence_flags)) {
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drm_fence_usage_deref_unlocked(dev, fence);
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bo->fence = NULL;
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return 0;
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}
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drm_fence_object_flush(dev, fence, DRM_FENCE_EXE);
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if (drm_fence_object_signaled(fence, bo->fence_flags)) {
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drm_fence_usage_deref_unlocked(dev, fence);
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bo->fence = NULL;
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return 0;
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}
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return 1;
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}
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return 0;
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}
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/*
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* Wait for buffer idle and register that we've mapped the buffer.
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*/
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static int drm_buffer_object_map(drm_file_t *priv, uint32_t handle, int wait)
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{
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drm_buffer_object_t *bo;
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drm_device_t *dev = priv->head->dev;
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int ret;
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mutex_lock(&dev->struct_mutex);
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bo = drm_lookup_buffer_object(priv, handle, 1);
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mutex_unlock(&dev->struct_mutex);
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if (!bo)
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return -EINVAL;
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mutex_lock(&bo->mutex);
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if (!wait) {
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if ((atomic_read(&bo->mapped) == 0) &&
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drm_bo_busy(dev, bo)) {
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mutex_unlock(&bo->mutex);
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return -EBUSY;
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}
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} else {
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ret = drm_bo_wait(dev, bo, 0);
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if (ret) {
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mutex_unlock(&bo->mutex);
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return -EBUSY;
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}
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}
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mutex_lock(&dev->struct_mutex);
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ret = drm_add_ref_object(priv, &bo->base, _DRM_REF_TYPE1);
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mutex_unlock(&dev->struct_mutex);
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if (!ret) {
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atomic_inc(&bo->mapped);
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}
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mutex_unlock(&bo->mutex);
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return ret;
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}
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int drm_bo_ioctl(DRM_IOCTL_ARGS)
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{
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DRM_DEVICE;
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drm_bo_arg_t arg;
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drm_bo_arg_request_t *req = &arg.req;
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drm_bo_arg_reply_t rep;
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unsigned long next;
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drm_user_object_t *uo;
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drm_buffer_object_t *entry;
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do {
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DRM_COPY_FROM_USER_IOCTL(arg, (void __user *)data, sizeof(arg));
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rep.ret = 0;
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rep.handled = 0;
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switch (req->op) {
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case drm_bo_map:
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rep.ret = drm_buffer_object_map(priv, req->handle,
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!(req->hint &
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DRM_BO_HINT_DONT_BLOCK));
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break;
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case drm_bo_destroy:
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mutex_lock(&dev->struct_mutex);
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uo = drm_lookup_user_object(priv, req->handle);
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if (!uo || (uo->type != drm_buffer_type) || uo->owner != priv) {
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mutex_unlock(&dev->struct_mutex);
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rep.ret = -EINVAL;
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break;
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}
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rep.ret = drm_remove_user_object(priv, uo);
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mutex_unlock(&dev->struct_mutex);
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break;
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case drm_bo_reference:
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rep.ret = drm_user_object_ref(priv, req->handle,
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drm_buffer_type, &uo);
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if (rep.ret)
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break;
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mutex_lock(&dev->struct_mutex);
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uo = drm_lookup_user_object(priv, req->handle);
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entry = drm_user_object_entry(uo, drm_buffer_object_t, base);
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atomic_dec(&entry->usage);
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mutex_unlock(&dev->struct_mutex);
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break;
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case drm_bo_unreference:
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rep.ret = drm_user_object_unref(priv, req->handle,
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drm_buffer_type);
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break;
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default:
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rep.ret = -EINVAL;
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}
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next = drm_ul(req->next);
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rep.handled = 1;
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arg.rep = rep;
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DRM_COPY_TO_USER_IOCTL((void __user *)data, arg, sizeof(arg));
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data = next;
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} while (data);
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return 0;
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}
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