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

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

On 15/06/2016 13:49, 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.
>
> Signed-off-by: Yang Rong <rong.r.yang@intel.com>
> ---
>   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
>

Please note that these are not yet added in kernel because opensource 
user is required to merge kernel support.

At the moment kernel bits are separated and are merged, only thing 
remaining is to export these getparam ioctls which can be done once 
userspace is available which is the current set of patches.

Once these patches are reviewed then I can export them from kernel side 
also.

regards
Arun

>   typedef struct drm_i915_getparam {
>   	__s32 param;
> diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
> index a1abbcd..8370694 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, unsigned int *has_pooled_eu);
> +int drm_intel_get_min_eu_in_pool(int fd, unsigned int *min_eu);
> +
>   /** @{ 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..b8bb654 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, unsigned int *has_pooled_eu)
> +{
> +	drm_i915_getparam_t gp;
> +	int ret;
> +
> +	memclear(gp);
> +	gp.value = (int*)has_pooled_eu;
> +	gp.param = I915_PARAM_HAS_POOLED_EU;
> +	ret = drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
> +	if (ret)
> +		return -errno;
> +
> +	return 0;
> +}
> +
> +int
> +drm_intel_get_min_eu_in_pool(int fd, unsigned int *min_eu)
> +{
> +	drm_i915_getparam_t gp;
> +	int ret;
> +
> +	memclear(gp);
> +	gp.value = (int*)min_eu;
> +	gp.param = I915_PARAM_MIN_EU_IN_POOL;
> +	ret = drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
> +	if (ret)
> +		return -errno;
> +
> +	return 0;
> +}
> +
>   /**
>    * Annotate the given bo for use in aub dumping.
>    *
>

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