[PATCH 03/15] drm/i915: Drop spinlocks around adding to the client request list

Chris Wilson
2017-02-23T16:18:38Z

Adding to the tail of the client request list as the only other user is
in the throttle ioctl that iterates forwards over the list. It only
needs protection against deletion of a request as it reads it, it simply
won't see a new request added to the end of the list, or it would be too
early and rejected. We can further reduce the number of spinlocks
required when throttling by removing stale requests from the client_list
as we throttle.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 14 ++++++------
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 13 ++++++++----
drivers/gpu/drm/i915/i915_gem_request.c | 34 ++++++------------------------
drivers/gpu/drm/i915/i915_gem_request.h | 4 +---
5 files changed, 23 insertions(+), 44 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1a28b5279bec..ddae8e442176 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -506,7 +506,7 @@ static int i915_gem_object_info(struct seq_file *m, void *data)
mutex_lock(&dev->struct_mutex);
request = list_first_entry_or_null(&file_priv->mm.request_list,
struct drm_i915_gem_request,
- client_list);
+ client_link);
rcu_read_lock();
task = pid_task(request && request->ctx->pid ?
request->ctx->pid : file->pid,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index de1fc98e041d..92ab989bb05f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3667,16 +3667,14 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
return -EIO;

spin_lock(&file_priv->mm.lock);
- list_for_each_entry(request, &file_priv->mm.request_list, client_list) {
+ list_for_each_entry(request, &file_priv->mm.request_list, client_link) {
if (time_after_eq(request->emitted_jiffies, recent_enough))
break;

- /*
- * Note that the request might not have been submitted yet.
- * In which case emitted_jiffies will be zero.
- */
- if (!request->emitted_jiffies)
- continue;
+ if (target) {
+ list_del(&target->client_link);
+ target->file_priv = NULL;
+ }

target = request;
}
@@ -4735,7 +4733,7 @@ void i915_gem_release(struct drm_device *dev, struct drm_file *file)
* file_priv.
*/
spin_lock(&file_priv->mm.lock);
- list_for_each_entry(request, &file_priv->mm.request_list, client_list)
+ list_for_each_entry(request, &file_priv->mm.request_list, client_link)
request->file_priv = NULL;
spin_unlock(&file_priv->mm.lock);

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index e8ffe0c9a20e..2b570d0b2392 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1420,6 +1420,14 @@ i915_gem_execbuffer_parse(struct intel_engine_cs *engine,
return vma;
}

+static void
+add_to_client(struct drm_i915_gem_request *req,
+ struct drm_file *file)
+{
+ req->file_priv = file->driver_priv;
+ list_add_tail(&req->client_link, &req->file_priv->mm.request_list);
+}
+
static int
execbuf_submit(struct i915_execbuffer_params *params,
struct drm_i915_gem_execbuffer2 *args,
@@ -1507,6 +1515,7 @@ execbuf_submit(struct i915_execbuffer_params *params,
return ret;

i915_gem_execbuffer_move_to_active(vmas, params->request);
+ add_to_client(params->request, params->file);

return 0;
}
@@ -1886,10 +1895,6 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
*/
params->request->batch = params->batch;

- ret = i915_gem_request_add_to_client(params->request, file);
- if (ret)
- goto err_request;
-
/*
* Save assorted stuff away to pass through to *_submission().
* NB: This data should be 'persistent' and not local as it will
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 3a159cac2172..5bca3e25bf61 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -82,42 +82,20 @@ const struct dma_fence_ops i915_fence_ops = {
.release = i915_fence_release,
};

-int i915_gem_request_add_to_client(struct drm_i915_gem_request *req,
- struct drm_file *file)
-{
- struct drm_i915_private *dev_private;
- struct drm_i915_file_private *file_priv;
-
- WARN_ON(!req || !file || req->file_priv);
-
- if (!req || !file)
- return -EINVAL;
-
- if (req->file_priv)
- return -EINVAL;
-
- dev_private = req->i915;
- file_priv = file->driver_priv;
-
- spin_lock(&file_priv->mm.lock);
- req->file_priv = file_priv;
- list_add_tail(&req->client_list, &file_priv->mm.request_list);
- spin_unlock(&file_priv->mm.lock);
-
- return 0;
-}
-
static inline void
i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
{
- struct drm_i915_file_private *file_priv = request->file_priv;
+ struct drm_i915_file_private *file_priv;

+ file_priv = request->file_priv;
if (!file_priv)
return;

spin_lock(&file_priv->mm.lock);
- list_del(&request->client_list);
- request->file_priv = NULL;
+ if (request->file_priv) {
+ list_del(&request->client_link);
+ request->file_priv = NULL;
+ }
spin_unlock(&file_priv->mm.lock);
}

diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h
index cc24a6c72748..1edc0fa7794c 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -191,7 +191,7 @@ struct drm_i915_gem_request {

struct drm_i915_file_private *file_priv;
/** file_priv list entry for this request */
- struct list_head client_list;
+ struct list_head client_link;
};

extern const struct dma_fence_ops i915_fence_ops;
@@ -204,8 +204,6 @@ static inline bool dma_fence_is_i915(const struct dma_fence *fence)
struct drm_i915_gem_request * __must_check
i915_gem_request_alloc(struct intel_engine_cs *engine,
struct i915_gem_context *ctx);
-int i915_gem_request_add_to_client(struct drm_i915_gem_request *req,
- struct drm_file *file);
void i915_gem_request_retire_upto(struct drm_i915_gem_request *req);

static inline struct drm_i915_gem_request *