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drm/ttm: add ttm_bo_reserve_slowpath

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Instead of dropping everything, waiting for the bo to be unreserved
and trying over, a better strategy would be to do a blocking wait.

This can be mapped a lot better to a mutex_lock-like call.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
This commit is contained in:
Maarten Lankhorst 2013-01-15 14:57:05 +01:00
commit 5e45d7dfd7
2 changed files with 77 additions and 0 deletions
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30
include/drm/ttm/ttm_bo_driver.h
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@ -821,6 +821,36 @@ extern int ttm_bo_reserve(struct ttm_buffer_object *bo,
bool interruptible,
bool no_wait, bool use_sequence, uint32_t sequence);
/**
* ttm_bo_reserve_slowpath_nolru:
* @bo: A pointer to a struct ttm_buffer_object.
* @interruptible: Sleep interruptible if waiting.
* @sequence: Set (@bo)->sequence to this value after lock
*
* This is called after ttm_bo_reserve returns -EAGAIN and we backed off
* from all our other reservations. Because there are no other reservations
* held by us, this function cannot deadlock any more.
*
* Will not remove reserved buffers from the lru lists.
* Otherwise identical to ttm_bo_reserve_slowpath.
*/
extern int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
bool interruptible,
uint32_t sequence);
/**
* ttm_bo_reserve_slowpath:
* @bo: A pointer to a struct ttm_buffer_object.
* @interruptible: Sleep interruptible if waiting.
* @sequence: Set (@bo)->sequence to this value after lock
*
* This is called after ttm_bo_reserve returns -EAGAIN and we backed off
* from all our other reservations. Because there are no other reservations
* held by us, this function cannot deadlock any more.
*/
extern int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
bool interruptible, uint32_t sequence);
/**
* ttm_bo_reserve_nolru: