Re: [PATCH v4 1/6] drm/i915/guc: add doorbell map to debugfs/i915_guc_info

[Yu Dai <yu.dai@intel.com>]

LGTM.

Reviewed-by: Alex Dai <yu.dai@intel.com>

On 04/07/2016 10:21 AM, Dave Gordon wrote:
> To properly verify the driver->doorbell->GuC functionality, validation
> needs to know how the driver has assigned the doorbell cache lines and
> registers, so make them visible through debugfs.
>
> Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
> ---
>   drivers/gpu/drm/i915/i915_debugfs.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index be4bcdc..87a9f3e 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2488,6 +2488,7 @@ static int i915_guc_info(struct seq_file *m, void *data)
>   	struct i915_guc_client client = {};
>   	struct intel_engine_cs *engine;
>   	u64 total = 0;
> +	int i;
>   
>   	if (!HAS_GUC_SCHED(dev_priv))
>   		return 0;
> @@ -2502,6 +2503,13 @@ static int i915_guc_info(struct seq_file *m, void *data)
>   
>   	mutex_unlock(&dev->struct_mutex);
>   
> +	seq_printf(m, "Doorbell map:\n");
> +	for (i = 0; i < BITS_TO_LONGS(GUC_MAX_DOORBELLS) - 3; i += 4)
> +		seq_printf(m, "\t%016lx %016lx %016lx %016lx\n",
> +			guc.doorbell_bitmap[i], guc.doorbell_bitmap[i+1],
> +			guc.doorbell_bitmap[i+2], guc.doorbell_bitmap[i+3]);
> +	seq_printf(m, "Doorbell next cacheline: 0x%x\n\n", guc.db_cacheline);
> +
>   	seq_printf(m, "GuC total action count: %llu\n", guc.action_count);
>   	seq_printf(m, "GuC action failure count: %u\n", guc.action_fail);
>   	seq_printf(m, "GuC last action command: 0x%x\n", guc.action_cmd);

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