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drm/i915: Serialize insertion into the file->mm.request_list 

Currently, we remove the from per-file request list for throttling and
retirement under a dedicated spinlock, but insertion is governed by
struct_mutex. This needs to be the same lock so that the
retirement/insertion of neighbouring requests (at the tail) doesn't
break the list.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190820080907.4665-1-chris@chris-wilson.co.uk
alistair/sunxi64-5.4-dsi
Chris Wilson 2019-08-20 09:09:07 +01:00
parent 149d6deb88
commit 44c22f3f1a
2 changed files with 10 additions and 5 deletions
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9
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -2005,8 +2005,13 @@ err:
static void
add_to_client(struct i915_request *rq, struct drm_file *file)
{
rq->file_priv = file->driver_priv;
list_add_tail(&rq->client_link, &rq->file_priv->mm.request_list);
struct drm_i915_file_private *file_priv = file->driver_priv;
rq->file_priv = file_priv;
spin_lock(&file_priv->mm.lock);
list_add_tail(&rq->client_link, &file_priv->mm.request_list);
spin_unlock(&file_priv->mm.lock);
}
static int eb_submit(struct i915_execbuffer *eb)

6
drivers/gpu/drm/i915/i915_request.c
View File

@ -165,11 +165,11 @@ static void __notify_execute_cb(struct i915_request *rq)
}
static inline void
i915_request_remove_from_client(struct i915_request *request)
remove_from_client(struct i915_request *request)
{
struct drm_i915_file_private *file_priv;
file_priv = request->file_priv;
file_priv = READ_ONCE(request->file_priv);
if (!file_priv)
return;
@ -282,7 +282,7 @@ static bool i915_request_retire(struct i915_request *rq)
local_irq_enable();
i915_request_remove_from_client(rq);
remove_from_client(rq);
list_del(&rq->link);
intel_context_exit(rq->hw_context);