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drm/i915: Introduce intel_context.pin_mutex for pin management

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Introduce a mutex to start locking the HW contexts independently of
struct_mutex, with a view to reducing the coarse struct_mutex. The
intel_context.pin_mutex is used to guard the transition to and from being
pinned on the gpu, and so is required before starting to build any
request. The intel_context will then remain pinned until the request
completes, but the mutex can be released immediately unpin completion of
pinning the context.

A slight variant of the above is used by per-context sseu that wants to
inspect the pinned status of the context, and requires that it remains
stable (either !pinned or pinned) across its operation. By using the
pin_mutex to serialise operations while pin_count==0, we can take that
pin_mutex for stabilise the boolean pin status.

v2: for Tvrtko!
* Improved commit message.
* Dropped _gpu suffix from gen8_modify_rpcs_gpu.
v3: Repair the locking for sseu selftests

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190308132522.21573-7-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-03-08 13:25:22 +00:00
parent 9dbfea98d7
commit 0881954965
8 changed files with 105 additions and 57 deletions
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4
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -1357,7 +1357,7 @@ static void __ring_context_fini(struct intel_context *ce)
static void ring_context_destroy(struct intel_context *ce)
{
GEM_BUG_ON(ce->pin_count);
GEM_BUG_ON(intel_context_is_pinned(ce));
if (ce->state)
__ring_context_fini(ce);
@@ -1918,7 +1918,7 @@ static int ring_request_alloc(struct i915_request *request)
{
int ret;
GEM_BUG_ON(!request->hw_context->pin_count);
GEM_BUG_ON(!intel_context_is_pinned(request->hw_context));
GEM_BUG_ON(request->timeline->has_initial_breadcrumb);
/*