[1/9] drm/i915/pxp: Add MTL PXP GSC-CS back-end skeleton

Commit Message

Alan Previn Jan. 11, 2023, 12:56 a.m. UTC

Add MTL PXP GSC-CS back-end stub functions hook them
up from PXP front-end and PXP session management functions.

Signed-off-by: Alan Previn <[e-mail]>
---
 drivers/gpu/drm/i915/Makefile                |  1 +
 drivers/gpu/drm/i915/pxp/intel_pxp.c         | 19 +++++++++++++---
 drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c   | 23 ++++++++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h   | 18 +++++++++++++++
 drivers/gpu/drm/i915/pxp/intel_pxp_session.c |  6 ++++-
 drivers/gpu/drm/i915/pxp/intel_pxp_types.h   |  6 +++++
 6 files changed, 69 insertions(+), 4 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
 create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h

Patch

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index f47f00b162a4..eae4325310e8 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -330,6 +330,7 @@  i915-y += \
 i915-$(CONFIG_DRM_I915_PXP) += \
 	pxp/intel_pxp_cmd.o \
 	pxp/intel_pxp_debugfs.o \
+	pxp/intel_pxp_gsccs.o \
 	pxp/intel_pxp_irq.o \
 	pxp/intel_pxp_pm.o \
 	pxp/intel_pxp_session.o
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index cfc9af8b3d21..be52bf92e847 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -12,6 +12,7 @@ 
 #include "i915_drv.h"
 
 #include "intel_pxp.h"
+#include "intel_pxp_gsccs.h"
 #include "intel_pxp_irq.h"
 #include "intel_pxp_session.h"
 #include "intel_pxp_tee.h"
@@ -132,7 +133,10 @@  static void pxp_init_full(struct intel_pxp *pxp)
 	if (ret)
 		return;
 
-	ret = intel_pxp_tee_component_init(pxp);
+	if (pxp->uses_gsccs)
+		ret = intel_pxp_gsccs_init(pxp);
+	else
+		ret = intel_pxp_tee_component_init(pxp);
 	if (ret)
 		goto out_context;
 
@@ -157,6 +161,11 @@  static struct intel_gt *find_gt_for_required_teelink(struct drm_i915_private *i9
 	return NULL;
 }
 
+static bool pxp_has_gsccs(struct drm_i915_private *i915)
+{
+	return (i915->media_gt && HAS_ENGINE(i915->media_gt, GSC0));
+}
+
 static struct intel_gt *find_gt_for_required_protected_content(struct drm_i915_private *i915)
 {
 	if (!IS_ENABLED(CONFIG_DRM_I915_PXP) || !INTEL_INFO(i915)->has_pxp)
@@ -167,7 +176,7 @@  static struct intel_gt *find_gt_for_required_protected_content(struct drm_i915_p
 	 * on the media GT. NOTE: if we have a media-tile with a GSC-engine,
 	 * the VDBOX is already present so skip that check
 	 */
-	if (i915->media_gt && HAS_ENGINE(i915->media_gt, GSC0))
+	if (pxp_has_gsccs(i915))
 		return i915->media_gt;
 
 	/*
@@ -208,6 +217,7 @@  int intel_pxp_init(struct drm_i915_private *i915)
 		return -ENOMEM;
 
 	i915->pxp->ctrl_gt = gt;
+	i915->pxp->uses_gsccs = pxp_has_gsccs(i915);
 
 	/*
 	 * If full PXP feature is not available but HuC is loaded by GSC on pre-MTL
@@ -229,7 +239,10 @@  void intel_pxp_fini(struct drm_i915_private *i915)
 
 	i915->pxp->arb_is_valid = false;
 
-	intel_pxp_tee_component_fini(i915->pxp);
+	if (i915->pxp->uses_gsccs)
+		intel_pxp_gsccs_fini(i915->pxp);
+	else
+		intel_pxp_tee_component_fini(i915->pxp);
 
 	destroy_vcs_context(i915->pxp);
 
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
new file mode 100644
index 000000000000..21400650fc86
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
@@ -0,0 +1,23 @@ 
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2023 Intel Corporation.
+ */
+
+#include "i915_drv.h"
+#include "intel_pxp_types.h"
+#include "intel_pxp_gsccs.h"
+
+int intel_pxp_gsccs_create_session(struct intel_pxp *pxp,
+				   int arb_session_id)
+{
+	return -ENODEV;
+}
+
+void intel_pxp_gsccs_fini(struct intel_pxp *pxp)
+{
+}
+
+int intel_pxp_gsccs_init(struct intel_pxp *pxp)
+{
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
new file mode 100644
index 000000000000..967f8fc3b5b5
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
@@ -0,0 +1,18 @@ 
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright(c) 2022, Intel Corporation. All rights reserved.
+ */
+
+#ifndef __INTEL_PXP_GSCCS_H__
+#define __INTEL_PXP_GSCCS_H__
+
+#include <linux/types.h>
+
+struct intel_pxp;
+
+int intel_pxp_gsccs_create_session(struct intel_pxp *pxp,
+				   int arb_session_id);
+void intel_pxp_gsccs_fini(struct intel_pxp *pxp);
+int intel_pxp_gsccs_init(struct intel_pxp *pxp);
+
+#endif /*__INTEL_PXP_GSCCS_H__ */
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
index ae413580b81a..080aa2209c5b 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
@@ -7,6 +7,7 @@ 
 
 #include "intel_pxp.h"
 #include "intel_pxp_cmd.h"
+#include "intel_pxp_gsccs.h"
 #include "intel_pxp_session.h"
 #include "intel_pxp_tee.h"
 #include "intel_pxp_types.h"
@@ -66,7 +67,10 @@  static int pxp_create_arb_session(struct intel_pxp *pxp)
 		return -EEXIST;
 	}
 
-	ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
+	if (pxp->uses_gsccs)
+		ret = intel_pxp_gsccs_create_session(pxp, ARB_SESSION);
+	else
+		ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
 	if (ret) {
 		drm_err(&gt->i915->drm, "tee cmd for arb session creation failed\n");
 		return ret;
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
index 7dc5f08d1583..43aa61c26de5 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
@@ -26,6 +26,12 @@  struct intel_pxp {
 	 */
 	struct intel_gt *ctrl_gt;
 
+	/**
+	 * @uses_gsccs: PXP interface for firmware access and pxp-session controls is
+	 * via the GSC-CS engine. This is for MTL+ platforms.
+	 */
+	bool uses_gsccs;
+
 	/**
 	 * @pxp_component: i915_pxp_component struct of the bound mei_pxp
 	 * module. Only set and cleared inside component bind/unbind functions,