Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
---
drivers/gpu/drm/ttm/ttm_execbuf_util.c | 141 +++++++++++---------------------
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 1 -
include/drm/ttm/ttm_execbuf_util.h | 3 -
3 files changed, 50 insertions(+), 95 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index 9198755df086..ec36206da95a 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -32,20 +32,12 @@
#include <linux/sched.h>
#include <linux/module.h>
-static void ttm_eu_backoff_reservation_locked(struct list_head *list)
+static void ttm_eu_backoff_reservation_reverse(struct list_head *list,
+ struct ttm_validate_buffer *entry)
{
- struct ttm_validate_buffer *entry;
-
- list_for_each_entry(entry, list, head) {
+ list_for_each_entry_continue_reverse(entry, list, head) {
struct ttm_buffer_object *bo = entry->bo;
- if (!entry->reserved)
- continue;
- entry->reserved = false;
- if (entry->removed) {
- ttm_bo_add_to_lru(bo);
- entry->removed = false;
- }
ww_mutex_unlock(&bo->resv->lock);
}
}
@@ -56,27 +48,9 @@ static void ttm_eu_del_from_lru_locked(struct list_head
*list)
list_for_each_entry(entry, list, head) {
struct ttm_buffer_object *bo = entry->bo;
- if (!entry->reserved)
- continue;
-
- if (!entry->removed) {
- entry->put_count = ttm_bo_del_from_lru(bo);
- entry->removed = true;
- }
- }
-}
-
-static void ttm_eu_list_ref_sub(struct list_head *list)
-{
- struct ttm_validate_buffer *entry;
-
- list_for_each_entry(entry, list, head) {
- struct ttm_buffer_object *bo = entry->bo;
+ unsigned put_count = ttm_bo_del_from_lru(bo);
- if (entry->put_count) {
- ttm_bo_list_ref_sub(bo, entry->put_count, true);
- entry->put_count = 0;
- }
+ ttm_bo_list_ref_sub(bo, put_count, true);
}
}
@@ -91,11 +65,18 @@ void ttm_eu_backoff_reservation(struct ww_acquire_ctx
*ticket,
entry = list_first_entry(list, struct ttm_validate_buffer, head);
glob = entry->bo->glob;
+
spin_lock(&glob->lru_lock);
- ttm_eu_backoff_reservation_locked(list);
+ list_for_each_entry(entry, list, head) {
+ struct ttm_buffer_object *bo = entry->bo;
+
+ ttm_bo_add_to_lru(bo);
+ ww_mutex_unlock(&bo->resv->lock);
+ }
+ spin_unlock(&glob->lru_lock);
+
if (ticket)
ww_acquire_fini(ticket);
- spin_unlock(&glob->lru_lock);
}
EXPORT_SYMBOL(ttm_eu_backoff_reservation);
@@ -121,64 +102,56 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
if (list_empty(list))
return 0;
- list_for_each_entry(entry, list, head) {
- entry->reserved = false;
- entry->put_count = 0;
- entry->removed = false;
- }
-
entry = list_first_entry(list, struct ttm_validate_buffer, head);
glob = entry->bo->glob;
if (ticket)
ww_acquire_init(ticket, &reservation_ww_class);
-retry:
+
list_for_each_entry(entry, list, head) {
struct ttm_buffer_object *bo = entry->bo;
- /* already slowpath reserved? */
- if (entry->reserved)
- continue;
-
ret = ttm_bo_reserve_nolru(bo, intr, (ticket == NULL), true,
ticket);
- if (ret == -EDEADLK) {
- /* uh oh, we lost out, drop every reservation and try
- * to only reserve this buffer, then start over if
- * this succeeds.
- */
- BUG_ON(ticket == NULL);
- spin_lock(&glob->lru_lock);
- ttm_eu_backoff_reservation_locked(list);
- spin_unlock(&glob->lru_lock);
- ttm_eu_list_ref_sub(list);
-
- if (intr) {
- ret =
ww_mutex_lock_slow_interruptible(&bo->resv->lock,
- ticket);
- if (unlikely(ret != 0)) {
- if (ret == -EINTR)
- ret = -ERESTARTSYS;
- goto err_fini;
- }
- } else
- ww_mutex_lock_slow(&bo->resv->lock, ticket);
-
- entry->reserved = true;
- if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
- ret = -EBUSY;
- goto err;
- }
- goto retry;
- } else if (ret)
- goto err;
+ if (!ret && unlikely(atomic_read(&bo->cpu_writers) > 0)) {
+ ww_mutex_unlock(&bo->resv->lock);
- entry->reserved = true;
- if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
ret = -EBUSY;
- goto err;
}
+
+ if (!ret)
+ continue;
+
+ /* uh oh, we lost out, drop every reservation and try
+ * to only reserve this buffer, then start over if
+ * this succeeds.
+ */
+ ttm_eu_backoff_reservation_reverse(list, entry);
+
+ if (ret == -EDEADLK && intr) {
+ ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
+ ticket);
+ } else if (ret == -EDEADLK) {
+ ww_mutex_lock_slow(&bo->resv->lock, ticket);
+ ret = 0;
+ }
+
+ if (unlikely(ret != 0)) {
+ if (ret == -EINTR)
+ ret = -ERESTARTSYS;
+ if (ticket) {
+ ww_acquire_done(ticket);
+ ww_acquire_fini(ticket);
+ }
+ return ret;
+ }
+
+ /* move this item to the front of the list,
+ * forces correct iteration of the loop without keeping track
+ */
+ list_del(&entry->head);
+ list_add(&entry->head, list);
}
if (ticket)
@@ -186,20 +159,7 @@ retry:
spin_lock(&glob->lru_lock);
ttm_eu_del_from_lru_locked(list);
spin_unlock(&glob->lru_lock);
- ttm_eu_list_ref_sub(list);
return 0;
-
-err:
- spin_lock(&glob->lru_lock);
- ttm_eu_backoff_reservation_locked(list);
- spin_unlock(&glob->lru_lock);
- ttm_eu_list_ref_sub(list);
-err_fini:
- if (ticket) {
- ww_acquire_done(ticket);
- ww_acquire_fini(ticket);
- }
- return ret;
}
EXPORT_SYMBOL(ttm_eu_reserve_buffers);
@@ -229,7 +189,6 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx
*ticket,
bo->sync_obj = driver->sync_obj_ref(sync_obj);
ttm_bo_add_to_lru(bo);
ww_mutex_unlock(&bo->resv->lock);
- entry->reserved = false;
}
spin_unlock(&bdev->fence_lock);
spin_unlock(&glob->lru_lock);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 7ca48db74a09..8d87631b3eb8 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -264,7 +264,6 @@ static int vmw_bo_to_validate_list(struct vmw_sw_context
*sw_context,
++sw_context->cur_val_buf;
val_buf = &vval_buf->base;
val_buf->bo = ttm_bo_reference(bo);
- val_buf->reserved = false;
list_add_tail(&val_buf->head, &sw_context->validate_nodes);
}
diff --git a/include/drm/ttm/ttm_execbuf_util.h
b/include/drm/ttm/ttm_execbuf_util.h
index fd95fd569ca3..8490cb8ee0d8 100644
--- a/include/drm/ttm/ttm_execbuf_util.h
+++ b/include/drm/ttm/ttm_execbuf_util.h
@@ -48,9 +48,6 @@
struct ttm_validate_buffer {
struct list_head head;
struct ttm_buffer_object *bo;
- bool reserved;
- bool removed;
- int put_count;
void *old_sync_obj;
};
--
1.8.5.2
