[Intel-gfx] [PATCH] drm/i915: add another virtual PCH bridge for passthrough support

[Kay, Allen M]

This patch is require for running i915 in a VM in universal passthrough (UPT) mode on some systems.  UPT mode allows IGD to be passed through to a VM without hypervisor quirks.

Reviewed-by: Allen Kay <allen.m.kay at intel.com>

> -----Original Message-----
> From: Jesse Barnes [mailto:jbarnes at virtuousgeek.org]
> Sent: Wednesday, March 16, 2016 1:32 PM
> To: intel-gfx at lists.freedesktop.org
> Cc: Kay, Allen M <allen.m.kay at intel.com>
> Subject: [PATCH] drm/i915: add another virtual PCH bridge for passthrough
> support
> 
> Some configs use the P2X type but some use a P3X type PCH, so add that to
> the detect_pch function so things work correctly.
> 
> Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 1 +
>  drivers/gpu/drm/i915/i915_drv.h | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c
> b/drivers/gpu/drm/i915/i915_drv.c index 20e8200..6ad4390 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -504,6 +504,7 @@ void intel_detect_pch(struct drm_device *dev)
>  				WARN_ON(!IS_SKYLAKE(dev) &&
>  					!IS_KABYLAKE(dev));
>  			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
> +				   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
>  				   ((id ==
> INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
>  				    pch->subsystem_vendor == 0x1af4 &&
>  				    pch->subsystem_device == 0x1100)) { diff -
> -git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 9e76bfc..e53cd42 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2695,6 +2695,7 @@ struct drm_i915_cmd_table {
>  #define INTEL_PCH_SPT_DEVICE_ID_TYPE		0xA100
>  #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
>  #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
> +#define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
>  #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35
> has 2918 */
> 
>  #define INTEL_PCH_TYPE(dev) (__I915__(dev)->pch_type)
> --
> 1.9.1