[Intel-gfx] [PATCH 5/9] drm/i915: Track runtime spent in closed GEM contexts

[Mika Kuoppala]

Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com> writes:

> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>
> As GEM contexts are closed we want to have the DRM client remember how
> much GPU time they used (per class) so later we can used it for smarter
> purposes.
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/gem/i915_gem_context.c | 12 +++++++++++-
>  drivers/gpu/drm/i915/i915_drm_client.h      |  7 +++++++
>  2 files changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index a12e926444e1..a50b83659399 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -351,8 +351,18 @@ static void i915_gem_context_free(struct i915_gem_context *ctx)
>  
>  	GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
>  
> -	if (client)
> +	if (client) {
> +		unsigned int i;
> +
> +		/* Transfer accumulated runtime to the parent drm client. */
> +		BUILD_BUG_ON(ARRAY_SIZE(client->past_runtime) !=
> +			     ARRAY_SIZE(ctx->past_runtime));
> +		for (i = 0; i < ARRAY_SIZE(client->past_runtime); i++)
> +			atomic64_add(atomic64_read(&ctx->past_runtime[i]),
> +				     &client->past_runtime[i]);
> +
>  		i915_drm_client_put(client);
> +	}
>  
>  	spin_lock(&ctx->i915->gem.contexts.lock);
>  	list_del(&ctx->link);
> diff --git a/drivers/gpu/drm/i915/i915_drm_client.h b/drivers/gpu/drm/i915/i915_drm_client.h
> index 11b48383881d..29b116606596 100644
> --- a/drivers/gpu/drm/i915/i915_drm_client.h
> +++ b/drivers/gpu/drm/i915/i915_drm_client.h
> @@ -15,6 +15,8 @@
>  #include <linux/sched.h>
>  #include <linux/xarray.h>
>  
> +#include "gt/intel_engine_types.h"
> +
>  struct i915_drm_clients {
>  	struct xarray xarray;
>  	u32 next_id;
> @@ -41,6 +43,11 @@ struct i915_drm_client {
>  		struct device_attribute pid;
>  		struct device_attribute name;
>  	} attr;
> +
> +	/**
> +	 * @past_runtime: Accumulation of pphwsp runtimes from closed contexts.
> +	 */
> +	atomic64_t past_runtime[MAX_ENGINE_CLASS + 1];
>  };
>  
>  void i915_drm_clients_init(struct i915_drm_clients *clients);
> -- 
> 2.25.1
>
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