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118 lines
4.4 KiB
118 lines
4.4 KiB
/************************************************************************** |
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* |
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., 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 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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* 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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**************************************************************************/ |
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/* |
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> |
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*/ |
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#ifndef _TTM_EXECBUF_UTIL_H_ |
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#define _TTM_EXECBUF_UTIL_H_ |
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#include <linux/list.h> |
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#include "ttm_bo_api.h" |
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/** |
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* struct ttm_validate_buffer |
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* |
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* @head: list head for thread-private list. |
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* @bo: refcounted buffer object pointer. |
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* @num_shared: How many shared fences we want to add. |
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*/ |
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struct ttm_validate_buffer { |
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struct list_head head; |
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struct ttm_buffer_object *bo; |
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unsigned int num_shared; |
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}; |
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/** |
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* function ttm_eu_backoff_reservation |
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* |
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* @ticket: ww_acquire_ctx from reserve call |
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* @list: thread private list of ttm_validate_buffer structs. |
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* |
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* Undoes all buffer validation reservations for bos pointed to by |
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* the list entries. |
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*/ |
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void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket, |
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struct list_head *list); |
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/** |
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* function ttm_eu_reserve_buffers |
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* |
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* @ticket: [out] ww_acquire_ctx filled in by call, or NULL if only |
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* non-blocking reserves should be tried. |
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* @list: thread private list of ttm_validate_buffer structs. |
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* @intr: should the wait be interruptible |
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* @dups: [out] optional list of duplicates. |
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* @del_lru: true if BOs should be removed from the LRU. |
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* |
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* Tries to reserve bos pointed to by the list entries for validation. |
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* If the function returns 0, all buffers are marked as "unfenced", |
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* taken off the lru lists and are not synced for write CPU usage. |
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* |
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* If the function detects a deadlock due to multiple threads trying to |
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* reserve the same buffers in reverse order, all threads except one will |
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* back off and retry. This function may sleep while waiting for |
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* CPU write reservations to be cleared, and for other threads to |
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* unreserve their buffers. |
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* |
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* If intr is set to true, this function may return -ERESTARTSYS if the |
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* calling process receives a signal while waiting. In that case, no |
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* buffers on the list will be reserved upon return. |
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* |
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* If dups is non NULL all buffers already reserved by the current thread |
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* (e.g. duplicates) are added to this list, otherwise -EALREADY is returned |
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* on the first already reserved buffer and all buffers from the list are |
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* unreserved again. |
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* |
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* Buffers reserved by this function should be unreserved by |
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* a call to either ttm_eu_backoff_reservation() or |
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* ttm_eu_fence_buffer_objects() when command submission is complete or |
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* has failed. |
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*/ |
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int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket, |
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struct list_head *list, bool intr, |
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struct list_head *dups); |
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/** |
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* function ttm_eu_fence_buffer_objects. |
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* |
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* @ticket: ww_acquire_ctx from reserve call |
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* @list: thread private list of ttm_validate_buffer structs. |
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* @fence: The new exclusive fence for the buffers. |
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* |
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* This function should be called when command submission is complete, and |
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* it will add a new sync object to bos pointed to by entries on @list. |
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* It also unreserves all buffers, putting them on lru lists. |
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* |
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*/ |
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void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket, |
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struct list_head *list, |
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struct dma_fence *fence); |
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#endif
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