drm/i915/pxp: Optimize GET_PARAM:PXP_STATUS

After recent discussions with Mesa folks, it was requested
that we optimize i915's GET_PARAM for the PXP_STATUS without
changing the UAPI spec.

Add these additional optimizations:
   - If any PXP initializatoin flow failed, then ensure that
     we catch it so that we can change the returned PXP_STATUS
     from "2" (i.e. 'PXP is supported but not yet ready')
     to "-ENODEV". This typically should not happen and if it
     does, we have a platform configuration issue.
   - If a PXP arbitration session creation event failed
     due to incorrect firmware version or blocking SOC fusing
     or blocking BIOS configuration (platform reasons that won't
     change if we retry), then reflect that blockage by also
     returning -ENODEV in the GET_PARAM:PXP_STATUS.
   - GET_PARAM:PXP_STATUS should not wait at all if PXP is
     supported but non-i915 dependencies (component-driver /
     firmware) we are still pending to complete the init flows.
     In this case, just return "2" immediately (i.e. 'PXP is
     supported but not yet ready').

Difference from prio revs:
  v3: - Rebase with latest tip that has pulled in setting the
        gsc fw load to fail if proxy init fails.
  v2: - Use a #define for the default readiness timeout (Vivaik).
      - Improve comments around the failing of proxy-init.
  v1: - Change the commit msg style to be imperative. (Jani)
      - Rename timeout to timeout_ms. (Jani)
      - Fix is_fw_err_platform_config to use higher order
        param (pxp) first. (Jani)

Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Balasubrawmanian, Vivaik <vivaik.balasubrawmanian@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230802182550.1592926-1-alan.previn.teres.alexis@intel.com

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
index 1a8765866b8b..7e11fa8034b2 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
@@ -27,6 +27,15 @@ struct intel_pxp {
 	struct intel_gt *ctrl_gt;
 
 	/**
+	 * @platform_cfg_is_bad: used to track if any prior arb session creation resulted
+	 * in a failure that was caused by a platform configuration issue, meaning that
+	 * failure will not get resolved without a change to the platform (not kernel)
+	 * such as BIOS configuration, firwmware update, etc. This bool gets reflected when
+	 * GET_PARAM:I915_PARAM_PXP_STATUS is called.
+	 */
+	bool platform_cfg_is_bad;
+
+	/**
 	 * @kcr_base: base mmio offset for the KCR engine which is different on legacy platforms
 	 * vs newer platforms where the KCR is inside the media-tile.
 	 */