[Intel-gfx] [PATCH 1/8] x86/early-quirks: Extend Intel graphics stolen memory placement to 64bit

[Chris Wilson]

Quoting Matthew Auld (2017-12-11 12:14:20)
> From: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> 
> To give upcoming SKU BIOSes more flexibility in placing the Intel
> graphics stolen memory, make all variables storing the placement or size
> compatible with full 64 bit range. Also by exporting the stolen region
> as a resource, we can then nuke the duplicated stolen discovery in i915.
> 
> Signed-off-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Cc: Ingo Molnar <mingo at kernel.org>
> Cc: H. Peter Anvin <hpa at zytor.com>
> Cc: x86 at kernel.org
> Cc: linux-kernel at vger.kernel.org
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk> #v3
> ---
> diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
> index 4e1b274e1164..c9e5a6621b95 100644
> --- a/include/drm/i915_drm.h
> +++ b/include/drm/i915_drm.h
> @@ -36,6 +36,9 @@ extern bool i915_gpu_lower(void);
>  extern bool i915_gpu_busy(void);
>  extern bool i915_gpu_turbo_disable(void);
>  
> +/* Exported from arch/x86/kernel/early-quirks.c */
> +extern struct resource intel_graphics_stolen_res;

It would be nice if we could flag to the compiler that it was always
const when exported. But I don't think that's possible with C's type
annotations.

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris