[PATCH 1/2] drm/i915: ignore posting read when using vgpu

[Zhenyu Wang]

On 2017.01.23 09:25:25 +0800, Weinan Li wrote:
> No need to do posting read when vgpu actived.
> 
> Signed-off-by: Weinan Li <weinan.z.li at intel.com>
> ---

Weinan, as this changes i915 driver but not only gvt, need to send
to intel-gfx list and cc gvt.

>  drivers/gpu/drm/i915/i915_drv.h | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 52d01be..8c9d81b 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -3830,8 +3830,11 @@ void vlv_set_phy_signal_level(struct intel_encoder *encoder,
>  	} while (upper != old_upper && loop++ < 2);			\
>  	(u64)upper << 32 | lower; })
>  
> -#define POSTING_READ(reg)	(void)I915_READ_NOTRACE(reg)
> -#define POSTING_READ16(reg)	(void)I915_READ16_NOTRACE(reg)
> +#define POSTING_READ(reg) ( \
> +	intel_vgpu_active(dev_priv) ? (void)0 : (void)I915_READ_NOTRACE(reg))
> +

Prefer to just write intel_vgpu_active(dev_priv) ? : (void)I915_READ_NOTRACE(reg)).

> +#define POSTING_READ16(reg) ( \
> +	intel_vgpu_active(dev_priv) ? (void)0 : (void)I915_READ16_NOTRACE(reg))
>  
>  #define __raw_read(x, s) \
>  static inline uint##x##_t __raw_i915_read##x(struct drm_i915_private *dev_priv, \
> @@ -3888,7 +3891,8 @@ void vlv_set_phy_signal_level(struct intel_encoder *encoder,
>  #define I915_READ_FW(reg__) __raw_i915_read32(dev_priv, (reg__))
>  #define I915_WRITE_FW(reg__, val__) __raw_i915_write32(dev_priv, (reg__), (val__))
>  #define I915_WRITE64_FW(reg__, val__) __raw_i915_write64(dev_priv, (reg__), (val__))
> -#define POSTING_READ_FW(reg__) (void)I915_READ_FW(reg__)
> +#define POSTING_READ_FW(reg__) ( \
> +	intel_vgpu_active(dev_priv) ? (void)0 : (void)I915_READ_FW(reg__))
>  
>  /* "Broadcast RGB" property */
>  #define INTEL_BROADCAST_RGB_AUTO 0
> -- 
> 1.9.1
> 
> _______________________________________________
> intel-gvt-dev mailing list
> intel-gvt-dev at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gvt-dev

-- 
Open Source Technology Center, Intel ltd.

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