Re: [Intel-gfx] [RFC 05/14] drm/i915/pxp: set KCR reg init during the boot time

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Fri, Feb 05, 2021 at 06:09:16PM -0800, Daniele Ceraolo Spurio wrote:
> Set the KCR init during the boot time, which is required by hardware,
> to allow us doing further protection operation such as sending commands
> to GPU or TEE.
> 
> Signed-off-by: Huang, Sean Z <sean.z.huang@intel.com>
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
> ---
>  drivers/gpu/drm/i915/pxp/intel_pxp.c | 29 +++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> index 4ddc8a71a3e7..950daee5b907 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> @@ -6,6 +6,24 @@
>  #include "gt/intel_context.h"
>  #include "i915_drv.h"
>  
> +/* KCR register definitions */
> +#define KCR_INIT _MMIO(0x320f0)
> +
> +/* Setting KCR Init bit is required after system boot */
> +#define KCR_INIT_ALLOW_DISPLAY_ME_WRITES REG_BIT(14)

I still don't like the spread register defines... we will soon have some weird duplications...

but seems a new trend...

rant aside:

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

> +
> +static void kcr_pxp_enable(struct intel_gt *gt)
> +{
> +	intel_uncore_write(gt->uncore, KCR_INIT,
> +			   _MASKED_BIT_ENABLE(KCR_INIT_ALLOW_DISPLAY_ME_WRITES));
> +}
> +
> +static void kcr_pxp_disable(struct intel_gt *gt)
> +{
> +	intel_uncore_write(gt->uncore, KCR_INIT,
> +			   _MASKED_BIT_DISABLE(KCR_INIT_ALLOW_DISPLAY_ME_WRITES));
> +}
> +
>  static int create_vcs_context(struct intel_pxp *pxp)
>  {
>  	struct intel_gt *gt = pxp_to_gt(pxp);
> @@ -43,19 +61,28 @@ void intel_pxp_init(struct intel_pxp *pxp)
>  	if (!HAS_PXP(gt->i915))
>  		return;
>  
> +	kcr_pxp_enable(gt);
> +
>  	ret = create_vcs_context(pxp);
>  	if (ret)
> -		return;
> +		goto out_kcr;
>  
>  	drm_info(&gt->i915->drm, "Protected Xe Path (PXP) protected content support initialized\n");
>  
>  	return;
> +
> +out_kcr:
> +	kcr_pxp_disable(gt);
>  }
>  
>  void intel_pxp_fini(struct intel_pxp *pxp)
>  {
> +	struct intel_gt *gt = pxp_to_gt(pxp);
> +
>  	if (!intel_pxp_is_enabled(pxp))
>  		return;
>  
>  	destroy_vcs_context(pxp);
> +
> +	kcr_pxp_disable(gt);
>  }
> -- 
> 2.29.2
> 
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