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drm/i915: Measure the required reserved size for request emission

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Instead of tediously and fragilely counting up the number of dwords
required to emit the breadcrumb to seal a request, fake a request and
measure it automatically once during engine setup.

The downside is that this requires a fair amount of mocking to create a
proper breadcrumb. Still, should be less error prone in future as the
breadcrumb size fluctuates!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190125100520.20163-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-01-25 10:05:20 +00:00
parent 8e525cb4a6
commit e1a73a54a9
5 changed files with 77 additions and 14 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -470,7 +470,7 @@ struct intel_engine_cs {
unsigned int dispatch_flags);
#define I915_DISPATCH_SECURE BIT(0)
#define I915_DISPATCH_PINNED BIT(1)
void (*emit_breadcrumb)(struct i915_request *rq, u32 *cs);
u32 *(*emit_breadcrumb)(struct i915_request *rq, u32 *cs);
int emit_breadcrumb_sz;
/* Pass the request to the hardware queue (e.g. directly into