[PATCH v3 06/37] drm/i915: Add memory region information to device_info

[Chris Wilson]

Quoting Matthew Auld (2019-08-09 23:26:12)
> From: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> 
> Exposes available regions for the platform. Shared memory will
> always be available.
> 
> Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_drv.h          | 2 ++
>  drivers/gpu/drm/i915/intel_device_info.h | 2 ++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 39cdf4eac2a6..d947f7415861 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2212,6 +2212,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
>  
>  #define HAS_IPC(dev_priv)               (INTEL_INFO(dev_priv)->display.has_ipc)
>  
> +#define HAS_REGION(i915, i) (INTEL_INFO(i915)->memory_regions & (i))
> +
>  #define HAS_GT_UC(dev_priv)    (INTEL_INFO(dev_priv)->has_gt_uc)
>  
>  /* Having GuC is not the same as using GuC */
> diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
> index 92e0c2e0954c..3166f38910f7 100644
> --- a/drivers/gpu/drm/i915/intel_device_info.h
> +++ b/drivers/gpu/drm/i915/intel_device_info.h
> @@ -159,6 +159,8 @@ struct intel_device_info {
>  
>         unsigned int page_sizes; /* page sizes supported by the HW */
>  
> +       u32 memory_regions; /* regions supported by the HW */
> +
>         u32 display_mmio_offset;
>  
>         u8 num_pipes;

If shared memory is always available, why is it absent?

Do you plan to distinguish scrubbed and zeroed system pages, private
pools to the process etc?
-Chris