On 27/01/2020 07:30, Umesh Nerlige Ramappa wrote:
On Sat, Jan 25, 2020 at 03:37:38AM +0200, Lionel Landwerlin wrote:
On 24/01/2020 03:37, Umesh Nerlige Ramappa wrote:
Engine context pinned in perf OA was set to same context id as
the idle context. Set the context id to an unused value.
Clear the sw context id field in lrc descriptor before ORing with
ce->tag (Chris)
Fixes: https://gitlab.freedesktop.org/drm/intel/issues/756
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 2 +-
drivers/gpu/drm/i915/i915_perf.c | 9 +++++++--
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c
b/drivers/gpu/drm/i915/gt/intel_lrc.c
index a13a8c4b65ab..cf6c43bd540a 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1211,12 +1211,12 @@ __execlists_schedule_in(struct i915_request
*rq)
if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
execlists_check_context(ce, engine);
+ ce->lrc_desc &= ~GENMASK_ULL(47, 37);
if (ce->tag) {
/* Use a fixed tag for OA and friends */
ce->lrc_desc |= (u64)ce->tag << 32;
} else {
/* We don't need a strict matching tag, just different
values */
- ce->lrc_desc &= ~GENMASK_ULL(47, 37);
I guess you can remove the line just above.
Not sure what you mean, the line is moved from here to above the if.
Oh sorry, Looking at the responding email, the '-' didn't appear :(
ce->lrc_desc |=
(u64)(++engine->context_tag % NUM_CONTEXT_TAG) <<
GEN11_SW_CTX_ID_SHIFT;
diff --git a/drivers/gpu/drm/i915/i915_perf.c
b/drivers/gpu/drm/i915/i915_perf.c
index 3c4647054557..5bd878c64504 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1323,7 +1323,12 @@ static int oa_get_render_ctx_id(struct
i915_perf_stream *stream)
case 12: {
stream->specific_ctx_id_mask =
((1U << GEN11_SW_CTX_ID_WIDTH) - 1) <<
(GEN11_SW_CTX_ID_SHIFT - 32);
- stream->specific_ctx_id = stream->specific_ctx_id_mask;
+ /* Pick an unused context id
+ * 0 - (NUM_CONTEXT_TAG - 1) are used by other contexts
+ * GEN12_MAX_CONTEXT_HW_ID (0x7ff) is used by idle context
+ */
+ stream->specific_ctx_id = (GEN12_MAX_CONTEXT_HW_ID - 1) <<
(GEN11_SW_CTX_ID_SHIFT - 32);
+ BUILD_BUG_ON((GEN12_MAX_CONTEXT_HW_ID - 1) < NUM_CONTEXT_TAG);
Arg yeah, we can't use an id that has all bits to 1 because that
matches the idle value in the OA reports :/
This also affects gen8-10 cases (afaik).
For gen8-10, I did not see a specific definition for an idle context
id. The from/to idle context switches are indicated by dedicated bits
in the CSB instead (from spec).
I meant that I remember the periodic OA reports when HW is idle to have
the contex_id=0xffffffff.
I could remember wrong :/
-Lionel
Thanks,
Umesh
Thanks for spotting this!
-Lionel
break;
}
@@ -1331,7 +1336,7 @@ static int oa_get_render_ctx_id(struct
i915_perf_stream *stream)
MISSING_CASE(INTEL_GEN(ce->engine->i915));
}
- ce->tag = stream->specific_ctx_id_mask;
+ ce->tag = stream->specific_ctx_id;
DRM_DEBUG_DRIVER("filtering on ctx_id=0x%x ctx_id_mask=0x%x\n",
stream->specific_ctx_id,
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