Re: [Patch V2] intel: Export pooled EU and min no. of eus in a pool.

[Arun Siluvery <arun.siluvery@linux.intel.com>]

On 15/07/2016 08:08, Yang Rong wrote:
> Update kernel interface with new I915_GETPARAM ioctl entries for
> pooled EU and min no. of eus in a pool. Add a wrapping function
> for each parameter. Userspace drivers need these values when decide
> the thread count. This kernel enabled pooled eu by default for BXT
> and for fused down 2x6 parts it is advised to turn it off.
>
> But there is another HW issue in these parts (fused
> down 2x6 parts) before C0 that requires Pooled EU to be enabled as a
> workaround. In this case the pool configuration changes depending upon
> which subslice is disabled and the no. of eus in a pool is different,
> So userspace need to know min no. of eus in a pool.
>
> V2: use return value as the query results.
>      ret < 0 when error, ret = 0 when not support, and ret > 0 indicate
>      query results.(Chris)
>
> Signed-off-by: Yang Rong <rong.r.yang@intel.com>
> ---

[+ chris, intel-gfx]


regards
Arun

>   include/drm/i915_drm.h   |  2 ++
>   intel/intel_bufmgr.h     |  3 +++
>   intel/intel_bufmgr_gem.c | 32 ++++++++++++++++++++++++++++++++
>   3 files changed, 37 insertions(+)
>
> diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
> index c4ce6b2..eb611a7 100644
> --- a/include/drm/i915_drm.h
> +++ b/include/drm/i915_drm.h
> @@ -357,6 +357,8 @@ typedef struct drm_i915_irq_wait {
>   #define I915_PARAM_HAS_GPU_RESET	 35
>   #define I915_PARAM_HAS_RESOURCE_STREAMER 36
>   #define I915_PARAM_HAS_EXEC_SOFTPIN	 37
> +#define I915_PARAM_HAS_POOLED_EU         38
> +#define I915_PARAM_MIN_EU_IN_POOL        39
>
>   typedef struct drm_i915_getparam {
>   	__s32 param;
> diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
> index a1abbcd..96a4d9d 100644
> --- a/intel/intel_bufmgr.h
> +++ b/intel/intel_bufmgr.h
> @@ -273,6 +273,9 @@ int drm_intel_get_reset_stats(drm_intel_context *ctx,
>   int drm_intel_get_subslice_total(int fd, unsigned int *subslice_total);
>   int drm_intel_get_eu_total(int fd, unsigned int *eu_total);
>
> +int drm_intel_get_pooled_eu(int fd);
> +int drm_intel_get_min_eu_in_pool(int fd);
> +
>   /** @{ Compatibility defines to keep old code building despite the symbol rename
>    * from dri_* to drm_intel_*
>    */
> diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
> index 0a4012b..4d9899d 100644
> --- a/intel/intel_bufmgr_gem.c
> +++ b/intel/intel_bufmgr_gem.c
> @@ -3237,6 +3237,38 @@ drm_intel_get_eu_total(int fd, unsigned int *eu_total)
>   	return 0;
>   }
>
> +int
> +drm_intel_get_pooled_eu(int fd)
> +{
> +	drm_i915_getparam_t gp;
> +	int ret;
> +
> +	memclear(gp);
> +	gp.param = I915_PARAM_HAS_POOLED_EU;
> +	gp.value = &ret;
> +	ret = drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
> +	if (ret)
> +		return -errno;
> +
> +	return ret;
> +}
> +
> +int
> +drm_intel_get_min_eu_in_pool(int fd)
> +{
> +	drm_i915_getparam_t gp;
> +	int ret;
> +
> +	memclear(gp);
> +	gp.param = I915_PARAM_MIN_EU_IN_POOL;
> +	gp.value = &ret;
> +	ret = drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
> +	if (ret)
> +		return -errno;
> +
> +	return ret;
> +}
> +
>   /**
>    * Annotate the given bo for use in aub dumping.
>    *
>

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