[PATCH v3 3/3] drm/i915: Include timeline seqno in error capture

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

The seqno value actually written out to memory is no longer in the
regular HWSP. Instead, it is now in its own private timeline buffer.
Thus, it is no longer visible in an error capture. So, explicitly read
the value and include that in the capture.

v2: %d -> %u (Alan)

Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis at intel.com>
---
 drivers/gpu/drm/i915/i915_gpu_error.c | 3 +++
 drivers/gpu/drm/i915/i915_gpu_error.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 904f21e1380cd..f020c0086fbcd 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -505,6 +505,7 @@ static void error_print_context(struct drm_i915_error_state_buf *m,
 		   header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
 		   ctx->guilty, ctx->active,
 		   ctx->total_runtime, ctx->avg_runtime);
+	err_printf(m, "  context timeline seqno %u\n", ctx->hwsp_seqno);
 }
 
 static struct i915_vma_coredump *
@@ -1395,6 +1396,8 @@ static bool record_context(struct i915_gem_context_coredump *e,
 	e->sched_attr = ctx->sched;
 	e->guilty = atomic_read(&ctx->guilty_count);
 	e->active = atomic_read(&ctx->active_count);
+	e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
+				*ce->timeline->hwsp_seqno : ~0U;
 
 	e->total_runtime = intel_context_get_total_runtime_ns(ce);
 	e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h
index 56027ffbce51f..a91932cc65317 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.h
+++ b/drivers/gpu/drm/i915/i915_gpu_error.h
@@ -107,6 +107,7 @@ struct intel_engine_coredump {
 		int active;
 		int guilty;
 		struct i915_sched_attr sched_attr;
+		u32 hwsp_seqno;
 	} context;
 
 	struct i915_vma_coredump *vma;
-- 
2.39.1