[PATCH] drm/i915: Drop spinlocks around adding to the client request list
Chris Wilson
chris at chris-wilson.co.uk
Thu Mar 2 18:28:17 UTC 2017
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 at chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 14 ++++++------
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 14 ++++++++----
drivers/gpu/drm/i915/i915_gem_request.c | 34 ++++++------------------------
drivers/gpu/drm/i915/i915_gem_request.h | 4 +---
5 files changed, 24 insertions(+), 44 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 9e3333e00449..b971ead5f299 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -480,7 +480,7 @@ 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 c09eb78bbe00..5efb18a229cc 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3666,16 +3666,14 @@ 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;
}
@@ -4734,7 +4732,7 @@ 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 aa75ea2d0578..dd7181ed5eca 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1407,6 +1407,14 @@ 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,
@@ -1772,10 +1780,6 @@ 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
@@ -1793,6 +1797,8 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
ret = execbuf_submit(params, args, &eb->vmas);
err_request:
__i915_add_request(params->request, ret == 0);
+ add_to_client(params->request, file);
+
if (out_fence) {
if (ret == 0) {
fd_install(out_fence_fd, out_fence->file);
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index b881d4e1bd1e..c2cee9674cb0 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 0efee879df23..5018e55922f0 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -180,7 +180,7 @@ 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;
@@ -193,8 +193,6 @@ 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 *
--
2.11.0
More information about the Intel-gfx-trybot
mailing list