On 06/02/2018 07:43 AM, Lionel Landwerlin wrote:
On 02/06/18 12:52, Chris Wilson wrote:
Quoting Lionel Landwerlin (2018-06-02 12:29:46)
One thing we didn't really understand about the OA report is that the
ContextID field (dword 2) is copy of the context descriptor (dword 1).
On Gen8->10 and without using GuC we didn't notice the issue because
we only checked the 21bits of the ContextID field in the OA reports
which matches exactly the hw_id stored into the context descriptor.
When using GuC submission we have an issue of a non matching hw_id
because GuC uses bit 20 of the hw_id to signal proxy submission. This
change introduces a mask to compare only the relevant bits.
On ICL the context descriptor format has changed and we failed to
address this. On top of using a mask we also need to shift the bits
properly.
v2: Reuse lrc_desc rather than recomputing part of it (Chris/Michel)
v3: Always pin the context we're filtering with (Chris)
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
Fixes: 1de401c08fa805 ("drm/i915/perf: enable perf support on ICL")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104252
BSpec: 1237
Testcase: igt/perf/gen8-unprivileged-single-ctx-counters
Acked-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Please ping Michel for an r-b confirmation on using the lrca for the guc
ctx_id.
-Chris
Got the information from Michel initially ;)
Will wait for his Rb on the last version.
Both patches,
Reviewed-by: Michel Thierry <michel.thierry@xxxxxxxxx>
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