For MTL, the PXP back-end transport uses the GSC engine to submit
HECI packets through the HW to the GSC firmware for PXP arb
session management. This submission uses a non-priveleged
batch buffer, a buffer for the command packet and of course
a context targeting the GSC-CS.
Thus for MTL, we need to allocate and free a set of execution
submission resources for the management of the arbitration session.
Lets start with the context creation first since that object and
its usage is very straight-forward. We'll add the buffer allocation
and freeing later when we introduce the gsccs' send-message function.
Do this one time allocation of gsccs specific resources in
a new gsccs source file with intel_pxp_gsccs_init / fini functions
and hook them up from the PXP front-end.
Signed-off-by: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/pxp/intel_pxp.c | 17 ++++--
drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c | 65 ++++++++++++++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h | 29 ++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp_types.h | 8 +++
5 files changed, 116 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
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 2184bc5b2be7..5fcbc049ebb3 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -331,6 +331,7 @@ 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..22280408156e 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 (HAS_ENGINE(pxp->ctrl_gt, GSC0))
+ ret = intel_pxp_gsccs_init(pxp);
+ else
+ ret = intel_pxp_tee_component_init(pxp);
if (ret)
goto out_context;
@@ -165,9 +169,11 @@ static struct intel_gt *find_gt_for_required_protected_content(struct drm_i915_p
/*
* For MTL onwards, PXP-controller-GT needs to have a valid GSC engine
* on the media GT. NOTE: if we have a media-tile with a GSC-engine,
- * the VDBOX is already present so skip that check
+ * the VDBOX is already present so skip that check. We also have to
+ * ensure the GSC firmware is coming online
*/
- if (i915->media_gt && HAS_ENGINE(i915->media_gt, GSC0))
+ if (i915->media_gt && HAS_ENGINE(i915->media_gt, GSC0) &&
+ intel_uc_fw_is_loadable(&i915->media_gt->uc.gsc.fw))
return i915->media_gt;
/*
@@ -229,7 +235,10 @@ void intel_pxp_fini(struct drm_i915_private *i915)
i915->pxp->arb_is_valid = false;
- intel_pxp_tee_component_fini(i915->pxp);
+ if (HAS_ENGINE(i915->pxp->ctrl_gt, GSC0))
+ 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..b304864902c8
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2023 Intel Corporation.
+ */
+
+#include "gem/i915_gem_internal.h"
+
+#include "gt/intel_context.h"
+
+#include "i915_drv.h"
+#include "intel_pxp_cmd_interface_43.h"
+#include "intel_pxp_gsccs.h"
+#include "intel_pxp_types.h"
+
+static void
+gsccs_destroy_execution_resource(struct intel_pxp *pxp)
+{
+ struct gsccs_session_resources *strm_res = &pxp->gsccs_res;
+
+ if (strm_res->ce)
+ intel_context_put(strm_res->ce);
+
+ memset(strm_res, 0, sizeof(*strm_res));
+}
+
+static int
+gsccs_allocate_execution_resource(struct intel_pxp *pxp)
+{
+ struct intel_gt *gt = pxp->ctrl_gt;
+ struct gsccs_session_resources *strm_res = &pxp->gsccs_res;
+ struct intel_engine_cs *engine = gt->engine[GSC0];
+ struct intel_context *ce;
+
+ /*
+ * First, ensure the GSC engine is present.
+ * NOTE: Backend would only be called with the correct gt.
+ */
+ if (!engine)
+ return -ENODEV;
+
+ mutex_init(&pxp->tee_mutex);
+
+ /* Finally, create an intel_context to be used during the submission */
+ ce = intel_context_create(engine);
+ if (IS_ERR(ce)) {
+ drm_err(>->i915->drm, "Failed creating gsccs backend ctx\n");
+ return PTR_ERR(ce);
+ }
+ i915_vm_put(ce->vm);
+ ce->vm = i915_vm_get(pxp->ctrl_gt->vm);
+
+ strm_res->ce = ce;
+
+ return 0;
+}
+
+void intel_pxp_gsccs_fini(struct intel_pxp *pxp)
+{
+ gsccs_destroy_execution_resource(pxp);
+}
+
+int intel_pxp_gsccs_init(struct intel_pxp *pxp)
+{
+ return gsccs_allocate_execution_resource(pxp);
+}
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..354ea9a8f940
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
@@ -0,0 +1,29 @@
+/* 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;
+
+#ifdef CONFIG_DRM_I915_PXP
+void intel_pxp_gsccs_fini(struct intel_pxp *pxp);
+int intel_pxp_gsccs_init(struct intel_pxp *pxp);
+
+#else
+static inline void intel_pxp_gsccs_fini(struct intel_pxp *pxp)
+{
+}
+
+static inline int intel_pxp_gsccs_init(struct intel_pxp *pxp)
+{
+ return 0;
+}
+
+#endif
+
+#endif /*__INTEL_PXP_GSCCS_H__ */
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
index 7dc5f08d1583..326bd8414407 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h
@@ -26,6 +26,14 @@ struct intel_pxp {
*/
struct intel_gt *ctrl_gt;
+ /**
+ * @gsccs_res: resources for request submission for platforms that have a GSC engine.
+ */
+ struct gsccs_session_resources {
+ u64 host_session_handle; /* used by firmware to link commands to sessions */
+ struct intel_context *ce; /* context for gsc command submission */
+ } gsccs_res;
+
/**
* @pxp_component: i915_pxp_component struct of the bound mei_pxp
* module. Only set and cleared inside component bind/unbind functions,
--
2.39.0
