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drm/ttm: convert to the reservation api

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Now that the code is compatible in semantics, flip the switch.
Use ww_mutex instead of the homegrown implementation.

ww_mutex uses -EDEADLK to signal that the caller has to back off,
and -EALREADY to indicate this buffer is already held by the caller.

ttm used -EAGAIN and -EDEADLK for those, respectively. So some changes
were needed to handle this correctly.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Maarten Lankhorst
2013-06-27 13:48:19 +02:00
committed by Dave Airlie
parent b580c9e2b7
commit 5e33840511
7 changed files with 80 additions and 194 deletions
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25
include/drm/ttm/ttm_bo_api.h
View File

@@ -39,6 +39,7 @@
#include <linux/mm.h>
#include <linux/rbtree.h>
#include <linux/bitmap.h>
#include <linux/reservation.h>
struct ttm_bo_device;
@@ -153,7 +154,6 @@ struct ttm_tt;
* 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.
* @event_queue: Queue for processes waiting on buffer object status change.
* @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
@@ -164,12 +164,6 @@ struct ttm_tt;
* @lru: List head for the lru list.
* @ddestroy: List head for the delayed destroy list.
* @swap: List head for swap LRU list.
* @val_seq: Sequence of the validation holding the @reserved lock.
* Used to avoid starvation when many processes compete to validate the
* buffer. This member is protected by the bo_device::lru_lock.
* @seq_valid: The value of @val_seq is valid. This value is protected by
* the bo_device::lru_lock.
* @reserved: Deadlock-free lock used for synchronization state transitions.
* @sync_obj: Pointer to a synchronization object.
* @priv_flags: Flags describing buffer object internal state.
* @vm_rb: Rb node for the vm rb tree.
@@ -209,10 +203,9 @@ struct ttm_buffer_object {
struct kref kref;
struct kref list_kref;
wait_queue_head_t event_queue;
/**
* Members protected by the bo::reserved lock.
* Members protected by the bo::resv::reserved lock.
*/
struct ttm_mem_reg mem;
@@ -234,15 +227,6 @@ struct ttm_buffer_object {
struct list_head ddestroy;
struct list_head swap;
struct list_head io_reserve_lru;
unsigned long val_seq;
bool seq_valid;
/**
* Members protected by the bdev::lru_lock
* only when written to.
*/
atomic_t reserved;
/**
* Members protected by struct buffer_object_device::fence_lock
@@ -272,6 +256,9 @@ struct ttm_buffer_object {
uint32_t cur_placement;
struct sg_table *sg;
struct reservation_object *resv;
struct reservation_object ttm_resv;
};
/**
@@ -736,7 +723,7 @@ extern void ttm_bo_swapout_all(struct ttm_bo_device *bdev);
*/
static inline bool ttm_bo_is_reserved(struct ttm_buffer_object *bo)
{
return atomic_read(&bo->reserved);
return ww_mutex_is_locked(&bo->resv->lock);
}
#endif

1
include/drm/ttm/ttm_execbuf_util.h
View File

@@ -33,7 +33,6 @@
#include <ttm/ttm_bo_api.h>
#include <linux/list.h>
#include <linux/reservation.h>
/**
* struct ttm_validate_buffer