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drm/ttm: rework BO delayed delete. v2

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This patch reworks the whole delayed deletion of BOs which aren't idle.

Instead of having two counters for the BO structure we resurrect the BO
when we find that a deleted BO is not idle yet.

This has many advantages, especially that we don't need to
increment/decrement the BOs reference counter any more when it
moves on the LRUs.

v2: remove duplicate ttm_tt_destroy, fix holde lock for LRU move

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: xinhui pan <xinhui.pan@amd.com>
Link: https://patchwork.freedesktop.org/patch/352912/
This commit is contained in:
Christian König 2019-11-11 14:42:13 +01:00
parent b1df3a2b24
commit 1ec39923ef
3 changed files with 97 additions and 132 deletions
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11
include/drm/ttm/ttm_bo_api.h
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@ -135,18 +135,14 @@ struct ttm_tt;
* @num_pages: Actual number of pages.
* @acc_size: Accounted size for this object.
* @kref: Reference count of this buffer object. When this refcount reaches
* zero, the object is put on the delayed delete list.
* @list_kref: List reference count of this buffer object. This member is
* used to avoid destruction while the buffer object is still on a list.
* Lru lists may keep one refcount, the delayed delete list, and kref != 0
* keeps one refcount. When this refcount reaches zero,
* the object is destroyed.
* zero, the object is destroyed or put on the delayed delete list.
* @mem: structure describing current placement.
* @persistent_swap_storage: Usually the swap storage is deleted for buffers
* pinned in physical memory. If this behaviour is not desired, this member
* holds a pointer to a persistent shmem object.
* @ttm: TTM structure holding system pages.
* @evicted: Whether the object was evicted without user-space knowing.
* @deleted: True if the object is only a zombie and already deleted.
* @lru: List head for the lru list.
* @ddestroy: List head for the delayed destroy list.
* @swap: List head for swap LRU list.
@ -183,9 +179,7 @@ struct ttm_buffer_object {
/**
* Members not needing protection.
*/
struct kref kref;
struct kref list_kref;
/**
* Members protected by the bo::resv::reserved lock.
@ -195,6 +189,7 @@ struct ttm_buffer_object {
struct file *persistent_swap_storage;
struct ttm_tt *ttm;
bool evicted;
bool deleted;
/**
* Members protected by the bdev::lru_lock.