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 at 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.
> *
>
