[PATCH 02/10] drm/syncobj: remove drm_syncobj_cb and cleanup

Chunming Zhou
2018-12-07T15:54:14Z

From: Christian König <ckoenig.leichtzumerken@gmail.com>

This completes "drm/syncobj: Drop add/remove_callback from driver
interface" and cleans up the implementation a bit.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/drm_syncobj.c | 91 ++++++++++++-----------------------
include/drm/drm_syncobj.h | 21 --------
2 files changed, 30 insertions(+), 82 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index db30a0e89db8..e19525af0cce 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -56,6 +56,16 @@
#include "drm_internal.h"
#include <drm/drm_syncobj.h>

+struct syncobj_wait_entry {
+ struct list_head node;
+ struct task_struct *task;
+ struct dma_fence *fence;
+ struct dma_fence_cb fence_cb;
+};
+
+static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
+ struct syncobj_wait_entry *wait);
+
/**
* drm_syncobj_find - lookup and reference a sync object.
* @file_private: drm file private pointer
@@ -82,58 +92,33 @@ struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
}
EXPORT_SYMBOL(drm_syncobj_find);

-static void drm_syncobj_add_callback_locked(struct drm_syncobj *syncobj,
- struct drm_syncobj_cb *cb,
- drm_syncobj_func_t func)
+static void drm_syncobj_fence_add_wait(struct drm_syncobj *syncobj,
+ struct syncobj_wait_entry *wait)
{
- cb->func = func;
- list_add_tail(&cb->node, &syncobj->cb_list);
-}
-
-static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
- struct dma_fence **fence,
- struct drm_syncobj_cb *cb,
- drm_syncobj_func_t func)
-{
- int ret;
-
- *fence = drm_syncobj_fence_get(syncobj);
- if (*fence)
- return 1;
+ if (wait->fence)
+ return;

spin_lock(&syncobj->lock);
/* We've already tried once to get a fence and failed. Now that we
* have the lock, try one more time just to be sure we don't add a
* callback when a fence has already been set.
*/
- if (syncobj->fence) {
- *fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
- lockdep_is_held(&syncobj->lock)));
- ret = 1;
- } else {
- *fence = NULL;
- drm_syncobj_add_callback_locked(syncobj, cb, func);
- ret = 0;
- }
+ if (syncobj->fence)
+ wait->fence = dma_fence_get(
+ rcu_dereference_protected(syncobj->fence, 1));
+ else
+ list_add_tail(&wait->node, &syncobj->cb_list);
spin_unlock(&syncobj->lock);
-
- return ret;
}

-void drm_syncobj_add_callback(struct drm_syncobj *syncobj,
- struct drm_syncobj_cb *cb,
- drm_syncobj_func_t func)
+static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj,
+ struct syncobj_wait_entry *wait)
{
- spin_lock(&syncobj->lock);
- drm_syncobj_add_callback_locked(syncobj, cb, func);
- spin_unlock(&syncobj->lock);
-}
+ if (!wait->node.next)
+ return;

-void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
- struct drm_syncobj_cb *cb)
-{
spin_lock(&syncobj->lock);
- list_del_init(&cb->node);
+ list_del_init(&wait->node);
spin_unlock(&syncobj->lock);
}

@@ -148,7 +133,7 @@ void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
struct dma_fence *fence)
{
struct dma_fence *old_fence;
- struct drm_syncobj_cb *cur, *tmp;
+ struct syncobj_wait_entry *cur, *tmp;

if (fence)
dma_fence_get(fence);
@@ -162,7 +147,7 @@ void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
if (fence != old_fence) {
list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) {
list_del_init(&cur->node);
- cur->func(syncobj, cur);
+ syncobj_wait_syncobj_func(syncobj, cur);
}
}

@@ -608,13 +593,6 @@ drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
&args->handle);
}

-struct syncobj_wait_entry {
- struct task_struct *task;
- struct dma_fence *fence;
- struct dma_fence_cb fence_cb;
- struct drm_syncobj_cb syncobj_cb;
-};
-
static void syncobj_wait_fence_func(struct dma_fence *fence,
struct dma_fence_cb *cb)
{
@@ -625,11 +603,8 @@ static void syncobj_wait_fence_func(struct dma_fence *fence,
}

static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
- struct drm_syncobj_cb *cb)
+ struct syncobj_wait_entry *wait)
{
- struct syncobj_wait_entry *wait =
- container_of(cb, struct syncobj_wait_entry, syncobj_cb);
-
/* This happens inside the syncobj lock */
wait->fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
lockdep_is_held(&syncobj->lock)));
@@ -688,12 +663,8 @@ static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
*/

if (flags & DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
- for (i = 0; i < count; ++i) {
- drm_syncobj_fence_get_or_add_callback(syncobjs[i],
- &entries[i].fence,
- &entries[i].syncobj_cb,
- syncobj_wait_syncobj_func);
- }
+ for (i = 0; i < count; ++i)
+ drm_syncobj_fence_add_wait(syncobjs[i], &entries[i]);
}

do {
@@ -742,9 +713,7 @@ static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,

cleanup_entries:
for (i = 0; i < count; ++i) {
- if (entries[i].syncobj_cb.func)
- drm_syncobj_remove_callback(syncobjs[i],
- &entries[i].syncobj_cb);
+ drm_syncobj_remove_wait(syncobjs[i], &entries[i]);
if (entries[i].fence_cb.func)
dma_fence_remove_callback(entries[i].fence,
&entries[i].fence_cb);
diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
index b1fe921f8e8f..7c6ed845c70d 100644
--- a/include/drm/drm_syncobj.h
+++ b/include/drm/drm_syncobj.h
@@ -28,8 +28,6 @@

#include "linux/dma-fence.h"

-struct drm_syncobj_cb;
-
/**
* struct drm_syncobj - sync object.
*
@@ -62,25 +60,6 @@ struct drm_syncobj {
struct file *file;
};

-typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,
- struct drm_syncobj_cb *cb);
-
-/**
- * struct drm_syncobj_cb - callback for drm_syncobj_add_callback
- * @node: used by drm_syncob_add_callback to append this struct to
- * &drm_syncobj.cb_list
- * @func: drm_syncobj_func_t to call
- *
- * This struct will be initialized by drm_syncobj_add_callback, additional
- * data can be passed along by embedding drm_syncobj_cb in another struct.
- * The callback will get called the next time drm_syncobj_replace_fence is
- * called.
- */
-struct drm_syncobj_cb {
- struct list_head node;
- drm_syncobj_func_t func;
-};
-
void drm_syncobj_free(struct kref *kref);

/**
--
2.17.1

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