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drm/i915: Assert that the context-switch completion matches our context 

When execlists signals the context completion, it also provides the
context id for the status event. Assert that id matches the one we expect.

v2: The upper dword of the context status is a duplicate of the upper
dword from elsp submission (i.e. includes the group id as well as the
context id). Include this check as well.
v3: Only check against lrc_desc (as this contains the hw_id check)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170123113132.18665-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-01-23 11:31:32 +00:00
parent 5d12fcef4e
commit 86aa7e760a
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/intel_lrc.c
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@ -595,6 +595,11 @@ static void intel_lrc_irq_handler(unsigned long data)
if (!(status & GEN8_CTX_STATUS_COMPLETED_MASK))
continue;
/* Check the context/desc id for this event matches */
GEM_BUG_ON(readl(buf + 2 * idx + 1) !=
upper_32_bits(intel_lr_context_descriptor(port[0].request->ctx,
engine)));
GEM_BUG_ON(port[0].count == 0);
if (--port[0].count == 0) {
GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);