[Libva] [LIBVA_INTEL_DRIVER][PATCH 1/4] Query the kernel API to check the EU counts of GPU device

[Xiang, Haihao]

On Wed, 2016-11-16 at 21:06 -0500, Zhao Yakui wrote:
> This info can be used to configure the max EU threads of GPU device.
> > eu_total * 6
> 
> Signed-off-by: Zhao Yakui <yakui.zhao at intel.com>
> ---
>  src/intel_driver.c | 13 +++++++++++++
>  src/intel_driver.h |  3 +++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/src/intel_driver.c b/src/intel_driver.c
> index bb19401..a2c8c71 100644
> --- a/src/intel_driver.c
> +++ b/src/intel_driver.c
> @@ -50,6 +50,12 @@ uint32_t g_intel_debug_option_flags = 0;
>  #define LOCAL_I915_PARAM_HAS_HUC 42
>  #endif
>  
> +#ifdef I915_PARAM_EU_TOTAL
> +#define LOCAL_I915_PARAM_EU_TOTAL I915_PARAM_EU_TOTAL
> +#else
> +#define LOCAL_I915_PARAM_EU_TOTAL 34
> +#endif
> +
>  static Bool
>  intel_driver_get_param(struct intel_driver_data *intel, int param,
> int *value)
>  {
> @@ -142,6 +148,13 @@ intel_driver_init(VADriverContextP ctx)
>      if (intel_driver_get_param(intel, LOCAL_I915_PARAM_HAS_HUC,
> &ret_value))
>          intel->has_huc = !!ret_value;
>  
> +    intel->has_eu_flag = 0;
> +    intel->eu_total = 0;
> +    if (intel_driver_get_param(intel, LOCAL_I915_PARAM_EU_TOTAL,
> &ret_value)) {
> +        intel->has_eu_flag = !!ret_value;
> +        intel->eu_total = ret_value;
> +    }
> +
>      intel_driver_get_revid(intel, &intel->revision);
>      return true;
>  }
> diff --git a/src/intel_driver.h b/src/intel_driver.h
> index dcdc03b..a02bfa8 100644
> --- a/src/intel_driver.h
> +++ b/src/intel_driver.h
> @@ -182,6 +182,9 @@ struct intel_driver_data
>      unsigned int has_vebox  : 1; /* Flag: has VEBOX unit */
>      unsigned int has_bsd2   : 1; /* Flag: has the second BSD video
> ring unit */
>      unsigned int has_huc    : 1; /* Flag: has a fully loaded HuC
> firmware? */
> +    unsigned int has_eu_flag : 1; /* Flag: Kernel will return EU
> counts */
> +
> +    int eu_total;


adding eu_total is enough, we can use the following if ... else
statement later

if (intel->eu_total > 0) {
  ...
} else {
  ...
}

It avoids setting the number of thread to 0 (although it is unlikely)
as well.

>  
>      const struct intel_device_info *device_info;
>  };