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