[PATCH v4 5/8] drm/i915/pxp: Add ARB session creation and cleanup

[Teres Alexis, Alan Previn]

On Thu, 2023-02-09 at 16:42 -0800, Teres Alexis, Alan Previn wrote:
> Add MTL's function for ARB session creation using PXP firmware
> version 4.3 ABI structure format.
> 
> Also add MTL's function for ARB session invalidation but this
> reuses PXP firmware version 4.2 ABI structure format.
> 
> Before checking the return status, look at the GSC-CS-Mem-Header's
> pending-bit which means the GSC firmware is busy and we should
> resubmit.
> 
> Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
> ---
> 

alan:snip..

> +void intel_pxp_gsccs_end_arb_fw_session(struct intel_pxp *pxp, u32 session_id)
> +{
> +	struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
> +	struct pxp42_inv_stream_key_in msg_in = {0};
> +	struct pxp42_inv_stream_key_out msg_out = {0};
> +	int ret = 0, tries = 0;
> +	u64 gsc_session_retry = 0;
> +
> +	memset(&msg_in, 0, sizeof(msg_in));
> +	memset(&msg_out, 0, sizeof(msg_out));
> +	msg_in.header.api_version = PXP_APIVER(4, 2);
> +
Firmware API version is backward compatibility and enforces the correct
API calls for the platform+firmware. Thus, although the structs are v4.2,
the api_version needs to carry PXP_APIVER(4, 3)

alan:snip..