Re: [Intel-gfx] [PATCH 2/8] drm/i915/guc: Add an explicit 'submission_initialized' flag

["Ceraolo Spurio, Daniele" <daniele.ceraolospurio@intel.com>]

On 2/17/2022 3:52 PM, John.C.Harrison@Intel.com wrote:
> From: John Harrison <John.C.Harrison@Intel.com>
>
> The LRC descriptor pool is going away. So, stop using it as a check
> for whether submission has been initialised or not.
>
> Signed-off-by: John Harrison <John.C.Harrison@Intel.com>

grep confirmed those are the only places we use the pool that way, so:

Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>

Daniele

> ---
>   drivers/gpu/drm/i915/gt/uc/intel_guc.h            | 2 ++
>   drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 8 +++++---
>   2 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> index 9d779de16613..568eb6352ef0 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> @@ -137,6 +137,8 @@ struct intel_guc {
>   	bool submission_supported;
>   	/** @submission_selected: tracks whether the user enabled GuC submission */
>   	bool submission_selected;
> +	/** @submission_initialized: tracks whether GuC submission has been initialised */
> +	bool submission_initialized;
>   	/**
>   	 * @rc_supported: tracks whether we support GuC rc on the current platform
>   	 */
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> index 7fb889e14995..11bf56b5a266 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> @@ -511,7 +511,7 @@ static void guc_lrc_desc_pool_destroy(struct intel_guc *guc)
>   
>   static inline bool guc_submission_initialized(struct intel_guc *guc)
>   {
> -	return !!guc->lrc_desc_pool_vaddr;
> +	return guc->submission_initialized;
>   }
>   
>   static inline void _reset_lrc_desc(struct intel_guc *guc, u32 id)
> @@ -1813,7 +1813,7 @@ int intel_guc_submission_init(struct intel_guc *guc)
>   	struct intel_gt *gt = guc_to_gt(guc);
>   	int ret;
>   
> -	if (guc->lrc_desc_pool)
> +	if (guc->submission_initialized)
>   		return 0;
>   
>   	ret = guc_lrc_desc_pool_create(guc);
> @@ -1845,19 +1845,21 @@ int intel_guc_submission_init(struct intel_guc *guc)
>   	INIT_DELAYED_WORK(&guc->timestamp.work, guc_timestamp_ping);
>   	guc->timestamp.ping_delay = (POLL_TIME_CLKS / gt->clock_frequency + 1) * HZ;
>   	guc->timestamp.shift = gpm_timestamp_shift(gt);
> +	guc->submission_initialized = true;
>   
>   	return 0;
>   }
>   
>   void intel_guc_submission_fini(struct intel_guc *guc)
>   {
> -	if (!guc->lrc_desc_pool)
> +	if (!guc->submission_initialized)
>   		return;
>   
>   	guc_flush_destroyed_contexts(guc);
>   	guc_lrc_desc_pool_destroy(guc);
>   	i915_sched_engine_put(guc->sched_engine);
>   	bitmap_free(guc->submission_state.guc_ids_bitmap);
> +	guc->submission_initialized = false;
>   }
>   
>   static inline void queue_request(struct i915_sched_engine *sched_engine,