Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> [ text/plain ]
> It's useful to look at the last seqno submitted on a particular engine
> and compare it against the HWS value to check for irregularities.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 6 ++++--
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/i915_gpu_error.c | 2 ++
> 3 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index a2e3af02c292..906e5424e488 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1363,8 +1363,10 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
>
> for_each_engine_id(engine, dev_priv, id) {
> seq_printf(m, "%s:\n", engine->name);
> - seq_printf(m, "\tseqno = %x [current %x]\n",
> - engine->hangcheck.seqno, seqno[id]);
> + seq_printf(m, "\tseqno = %x [current %x, last %x]\n",
> + engine->hangcheck.seqno,
> + seqno[id],
> + engine->last_submitted_seqno);
> seq_printf(m, "\tACTHD = 0x%08llx [current 0x%08llx]\n",
> (long long)engine->hangcheck.acthd,
> (long long)acthd[id]);
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 313bc3576d87..fad8e0d5a216 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -495,6 +495,7 @@ struct drm_i915_error_state {
> u32 cpu_ring_head;
> u32 cpu_ring_tail;
>
> + u32 last_seqno;
> u32 semaphore_seqno[I915_NUM_ENGINES - 1];
>
> /* Register state */
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 9b55409d91b3..9463cb4e9323 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -296,6 +296,7 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
> }
> }
> err_printf(m, " seqno: 0x%08x\n", ring->seqno);
> + err_printf(m, " last_seqno: 0x%08x\n", ring->last_seqno);
> err_printf(m, " waiting: %s\n", yesno(ring->waiting));
> err_printf(m, " ring->head: 0x%08x\n", ring->cpu_ring_head);
> err_printf(m, " ring->tail: 0x%08x\n", ring->cpu_ring_tail);
> @@ -931,6 +932,7 @@ static void i915_record_ring_state(struct drm_device *dev,
> ering->instpm = I915_READ(RING_INSTPM(engine->mmio_base));
> ering->seqno = engine->get_seqno(engine, false);
> ering->acthd = intel_ring_get_active_head(engine);
> + ering->last_seqno = engine->last_submitted_seqno;
> ering->start = I915_READ_START(engine);
> ering->head = I915_READ_HEAD(engine);
> ering->tail = I915_READ_TAIL(engine);
> --
> 2.8.0.rc3
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