[Beignet] [PATCH] drm/i915: Export total subslice and EU counts

[Zhigang Gong]

There is one minor conflict when apply the KMD patch to latest
drm-intel-nightly branch. It should be easy to fix.

Another issue is that IMO, we should bump libdrm's version number
when increase these new APIs. Then in Beignet, we can check the
libdrm version at build time and determine whether we will use
these new interfaces. Thus, we can avoid breaking beignet on
those systems which have previous libdrm/kernel installed.

The other parts of the whole patchset,
including patches for KMD/libdrm/Intel gpu tools and Beignet,
all look good to me.

And I just tested it on BDW and SKL platforms, it works fine.

Thanks,
Zhigang Gong.

On Mon, Mar 02, 2015 at 03:37:32PM -0800, jeff.mcgee at intel.com wrote:
> From: Jeff McGee <jeff.mcgee at intel.com>
> 
> Setup new I915_GETPARAM ioctl entries for subslice total and
> EU total. Userspace drivers need these values when constructing
> GPGPU commands. This kernel query method is intended to replace
> the PCI ID-based tables that userspace drivers currently maintain.
> The kernel driver can employ fuse register reads as needed to
> ensure the most accurate determination of GT config attributes.
> This first became important with Cherryview in which the config
> could differ between devices with the same PCI ID.
> 
> The kernel detection of these values is device-specific and not
> included in this patch. Because zero is not a valid value for any of
> these parameters, a value of zero is interpreted as unknown for the
> device. Userspace drivers should continue to maintain ID-based tables
> for older devices not supported by the new query method.
> 
> For: VIZ-4636
> Signed-off-by: Jeff McGee <jeff.mcgee at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_dma.c | 10 ++++++++++
>  include/uapi/drm/i915_drm.h     |  2 ++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index 053e178..9350ea2 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -150,6 +150,16 @@ static int i915_getparam(struct drm_device *dev, void *data,
>  	case I915_PARAM_MMAP_VERSION:
>  		value = 1;
>  		break;
> +	case I915_PARAM_SUBSLICE_TOTAL:
> +		value = INTEL_INFO(dev)->subslice_total;
> +		if (!value)
> +			return -ENODEV;
> +		break;
> +	case I915_PARAM_EU_TOTAL:
> +		value = INTEL_INFO(dev)->eu_total;
> +		if (!value)
> +			return -ENODEV;
> +		break;
>  	default:
>  		DRM_DEBUG("Unknown parameter %d\n", param->param);
>  		return -EINVAL;
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 6eed16b..8672efc 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -347,6 +347,8 @@ typedef struct drm_i915_irq_wait {
>  #define I915_PARAM_HAS_COHERENT_PHYS_GTT 29
>  #define I915_PARAM_MMAP_VERSION          30
>  #define I915_PARAM_HAS_BSD2		 31
> +#define I915_PARAM_SUBSLICE_TOTAL	 32
> +#define I915_PARAM_EU_TOTAL		 33
>  
>  typedef struct drm_i915_getparam {
>  	int param;
> -- 
> 2.3.0
> 
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