Chris Wilson <ch...@chris-wilson.co.uk> writes:
> Sometimes we need to see what instructions we emitted for a request to
> try and gather a glimmer of insight into what the GPU is doing when it
> stops responding.
>
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> ---
> drivers/gpu/drm/i915/intel_engine_cs.c | 35 ++++++++++++++++++++++----
> 1 file changed, 30 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
> b/drivers/gpu/drm/i915/intel_engine_cs.c
> index d278fed8cb31..d7f757fb8401 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -1443,12 +1443,10 @@ void intel_engine_dump(struct intel_engine_cs *engine,
>
> rq = i915_gem_find_active_request(engine);
> if (rq) {
> + void *ring;
> + int size;
> +
> print_request(m, rq, "\t\tactive ");
> - drm_printf(m,
> - "\t\t[head %04x, postfix %04x, tail %04x, batch
> 0x%08x_%08x]\n",
> - rq->head, rq->postfix, rq->tail,
> - rq->batch ? upper_32_bits(rq->batch->node.start) :
> ~0u,
> - rq->batch ? lower_32_bits(rq->batch->node.start) :
> ~0u);
> drm_printf(m, "\t\tring->start: 0x%08x\n",
> i915_ggtt_offset(rq->ring->vma));
> drm_printf(m, "\t\tring->head: 0x%08x\n",
> @@ -1459,6 +1457,33 @@ void intel_engine_dump(struct intel_engine_cs *engine,
> rq->ring->emit);
> drm_printf(m, "\t\tring->space: 0x%08x\n",
> rq->ring->space);
> +
> + drm_printf(m,
> + "[head %04x, postfix %04x, tail %04x, batch
> 0x%08x_%08x]:\n",
> + rq->head, rq->postfix, rq->tail,
> + rq->batch ? upper_32_bits(rq->batch->node.start) :
> ~0u,
> + rq->batch ? lower_32_bits(rq->batch->node.start) :
> ~0u);
While you are here, you might want to add the new rq->infix to the mix.
Reviewed-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
> +
> + size = rq->tail - rq->head;
> + if (rq->tail < rq->head)
> + size += rq->ring->size;
> +
> + ring = kmalloc(size, GFP_ATOMIC);
> + if (ring) {
> + const void *vaddr = rq->ring->vaddr;
> + unsigned int head = rq->head;
> + unsigned int len = 0;
> +
> + if (rq->tail < head) {
> + len = rq->ring->size - head;
> + memcpy(ring, vaddr + head, len);
> + head = 0;
> + }
> + memcpy(ring + len, vaddr + head, size - len);
> +
> + hexdump(m, ring, size);
> + kfree(ring);
> + }
> }
>
> rcu_read_unlock();
> --
> 2.17.1
>
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