[Intel-gfx] [RFC-v23 09/13] drm/i915/pxp: Expose session state for display protection flip

[Rodrigo Vivi]

On Mon, Jan 18, 2021 at 11:43:16PM -0800, Huang, Sean Z wrote:
> Implement the intel_pxp_gem_object_status() to allow i915 display
> querying the current PXP session state. In the design, display
> should not perform protection flip on the protected buffers if
> there is no PXP session alive. And Implement the funciton to set
> the protected flag for gem context.
> 
> rev23:
>     - Require user space to explicitly set recoverable flag to
>       false for protected context creation.
> 
> Signed-off-by: Huang, Sean Z <sean.z.huang at intel.com>
> ---
>  .../gpu/drm/i915/gem/i915_gem_context_types.h |  2 ++
>  drivers/gpu/drm/i915/pxp/intel_pxp.c          | 34 +++++++++++++++++++
>  drivers/gpu/drm/i915/pxp/intel_pxp.h          | 24 +++++++++++++
>  include/uapi/drm/i915_drm.h                   |  9 +++++
>  4 files changed, 69 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> index 1449f54924e0..7a9872d35fbb 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
> @@ -134,6 +134,8 @@ struct i915_gem_context {
>  #define UCONTEXT_BANNABLE		2
>  #define UCONTEXT_RECOVERABLE		3
>  #define UCONTEXT_PERSISTENCE		4
> +#define UCONTEXT_PROTECTED		5
> +#define UCONTEXT_UNRECOVERABLE		6

I don't believe we want to extend this.

if I understood corectly, the request was to make sure that
UCONTEXT_RECOVERABLE is not set, not to create the negative one...

Joonas?

>  
>  	/**
>  	 * @flags: small set of booleans
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> index e6dd57ec73f5..f2ac5996700d 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
> @@ -157,3 +157,37 @@ void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir)
>  	pxp->current_events |= events;
>  	schedule_work(&pxp->irq_work);
>  }
> +
> +bool intel_pxp_gem_object_status(struct drm_i915_private *i915)
> +{
> +	if (i915->gt.pxp.ctx.inited &&
> +	    i915->gt.pxp.ctx.flag_display_hm_surface_keys)
> +		return true;
> +	else
> +		return false;
> +}
> +
> +int intel_pxp_gem_context_create_param(struct i915_gem_context *ctx,
> +				       struct drm_i915_gem_context_param *args)
> +{
> +	if (!ctx || !args)
> +		return -EINVAL;
> +
> +	if (args->param == I915_CONTEXT_PARAM_PROTECTED_CONTENT) {
> +		if (!intel_pxp_arb_session_is_in_play(&ctx->i915->gt.pxp))
> +			return -EINVAL;
> +
> +		if (args->value)
> +			set_bit(UCONTEXT_PROTECTED, &ctx->user_flags);
> +	} else if (args->param == I915_CONTEXT_PARAM_RECOVERABLE)
> +		if (!args->value)
> +			set_bit(UCONTEXT_UNRECOVERABLE, &ctx->user_flags);
> +
> +	return 0;
> +}
> +
> +bool intel_pxp_gem_context_protected_param_valid(struct i915_gem_context *ctx)
> +{
> +	return (test_bit(UCONTEXT_PROTECTED, &ctx->user_flags) &&
> +		test_bit(UCONTEXT_UNRECOVERABLE, &ctx->user_flags));
> +}
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
> index 420da2790624..ab461cc1839a 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
> @@ -12,6 +12,10 @@
>  #define PXP_IRQ_VECTOR_DISPLAY_APP_TERM_PER_FW_REQ BIT(2)
>  #define PXP_IRQ_VECTOR_PXP_DISP_STATE_RESET_COMPLETE BIT(3)
>  
> +struct drm_i915_private;
> +struct i915_gem_context;
> +struct drm_i915_gem_context_param;
> +
>  #ifdef CONFIG_DRM_I915_PXP
>  void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir);
>  int i915_pxp_teardown_required_callback(struct intel_pxp *pxp);
> @@ -19,6 +23,10 @@ int i915_pxp_global_terminate_complete_callback(struct intel_pxp *pxp);
>  
>  void intel_pxp_init(struct intel_pxp *pxp);
>  void intel_pxp_fini(struct intel_pxp *pxp);
> +bool intel_pxp_gem_object_status(struct drm_i915_private *i915);
> +int intel_pxp_gem_context_create_param(struct i915_gem_context *ctx,
> +				       struct drm_i915_gem_context_param *args);
> +bool intel_pxp_gem_context_protected_param_valid(struct i915_gem_context *ctx);
>  #else
>  static inline void intel_pxp_irq_handler(struct intel_pxp *pxp, u16 iir)
>  {
> @@ -41,6 +49,22 @@ static inline void intel_pxp_init(struct intel_pxp *pxp)
>  static inline void intel_pxp_fini(struct intel_pxp *pxp)
>  {
>  }
> +
> +static inline bool intel_pxp_gem_object_status(struct drm_i915_private *i915)
> +{
> +	return false;
> +}
> +
> +static inline int intel_pxp_gem_context_create_param(struct i915_gem_context *ctx,
> +						     struct drm_i915_gem_context_param *args)
> +{
> +	return 0;
> +}
> +
> +static inline bool intel_pxp_gem_context_protected_param_valid(struct i915_gem_context *ctx)
> +{
> +	return false;
> +}
>  #endif
>  
>  #endif /* __INTEL_PXP_H__ */
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 1987e2ea79a3..00fd1c2bcbb3 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1694,6 +1694,15 @@ struct drm_i915_gem_context_param {
>   * Default is 16 KiB.
>   */
>  #define I915_CONTEXT_PARAM_RINGSIZE	0xc
> +
> +/*
> + * I915_CONTEXT_PARAM_PROTECTED_CONTENT:
> + *
> + * If set to true (1) PAVP content protection is enabled.
> + * When enabled, the context is marked unrecoverable and may
> + * become invalid due to PAVP teardown event or other error.
> + */
> +#define I915_CONTEXT_PARAM_PROTECTED_CONTENT    0xd
>  /* Must be kept compact -- no holes and well documented */
>  
>  	__u64 value;
> -- 
> 2.17.1
> 
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