Create the arbitrary session, with the fixed session id 0xf, after
system boot, for the case that application allocates the protected
buffer without establishing any protection session. Because the
hardware requires at least one alive session for protected buffer
creation. This arbitrary session needs to be re-created after
teardown or power event because hardware encryption key won't be
valid after such cases.
Signed-off-by: Huang, Sean Z <sean.z.huang@xxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/pxp/intel_pxp.c | 1 +
drivers/gpu/drm/i915/pxp/intel_pxp.h | 16 +++
drivers/gpu/drm/i915/pxp/intel_pxp_arb.c | 134 +++++++++++++++++++
drivers/gpu/drm/i915/pxp/intel_pxp_arb.h | 38 ++++++
drivers/gpu/drm/i915/pxp/intel_pxp_context.h | 6 +
drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 38 ++++++
drivers/gpu/drm/i915/pxp/intel_pxp_tee.h | 6 +
8 files changed, 240 insertions(+)
create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_arb.c
create mode 100644 drivers/gpu/drm/i915/pxp/intel_pxp_arb.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 57447887d352..2c84f75b41da 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -258,6 +258,7 @@ i915-y += i915_perf.o
# Protected execution platform (PXP) support
i915-$(CONFIG_DRM_I915_PXP) += \
pxp/intel_pxp.o \
+ pxp/intel_pxp_arb.o \
pxp/intel_pxp_context.o \
pxp/intel_pxp_tee.o
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 4104dd89ca7f..67bdaeb79b40 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -6,6 +6,7 @@
#include "intel_pxp.h"
#include "intel_pxp_context.h"
#include "intel_pxp_tee.h"
+#include "intel_pxp_arb.h"
/* KCR register definitions */
#define KCR_INIT _MMIO(0x320f0)
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index 7c3d49a6a3ab..1841a9aa972d 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -8,6 +8,22 @@
#include "intel_pxp_context.h"
+enum pxp_session_types {
+ SESSION_TYPE_TYPE0 = 0,
+ SESSION_TYPE_TYPE1 = 1,
+
+ SESSION_TYPE_MAX
+};
+
+enum pxp_protection_modes {
+ PROTECTION_MODE_NONE = 0,
+ PROTECTION_MODE_LM = 2,
+ PROTECTION_MODE_HM = 3,
+ PROTECTION_MODE_SM = 6,
+
+ PROTECTION_MODE_ALL
+};
+
struct intel_pxp {
struct pxp_context ctx;
};
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_arb.c b/drivers/gpu/drm/i915/pxp/intel_pxp_arb.c
new file mode 100644
index 000000000000..9611cd53d3a4
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_arb.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2020, Intel Corporation. All rights reserved.
+ */
+
+#include "gt/intel_context.h"
+#include "gt/intel_engine_pm.h"
+
+#include "intel_pxp_arb.h"
+#include "intel_pxp.h"
+#include "intel_pxp_context.h"
+#include "intel_pxp_tee.h"
+
+#define GEN12_KCR_SIP _MMIO(0x32260) /* KCR type0 session in play 0-31 */
+
+/* Arbitrary session */
+#define ARB_SESSION_INDEX 0xf
+#define ARB_SESSION_TYPE SESSION_TYPE_TYPE0
+#define ARB_PROTECTION_MODE PROTECTION_MODE_HM
+
+static bool is_hw_arb_session_in_play(struct intel_pxp *pxp)
+{
+ u32 regval_sip = 0;
+ intel_wakeref_t wakeref;
+ struct intel_gt *gt = container_of(pxp, struct intel_gt, pxp);
+
+ with_intel_runtime_pm(>->i915->runtime_pm, wakeref) {
+ regval_sip = intel_uncore_read(gt->uncore, GEN12_KCR_SIP);
+ }
+
+ return regval_sip & BIT(ARB_SESSION_INDEX);
+}
+
+/* wait hw session_in_play reg to match the current sw state */
+static int wait_arb_hw_sw_state(struct intel_pxp *pxp)
+{
+ const int max_retry = 10;
+ const int ms_delay = 10;
+ int retry = 0;
+ int ret;
+ struct pxp_protected_session *arb = &pxp->ctx.arb_session;
+
+ ret = -EINVAL;
+ for (retry = 0; retry < max_retry; retry++) {
+ if (is_hw_arb_session_in_play(pxp) ==
+ arb->is_in_play) {
+ ret = 0;
+ break;
+ }
+
+ msleep(ms_delay);
+ }
+
+ return ret;
+}
+
+static void arb_session_entry_init(struct intel_pxp *pxp)
+{
+ struct pxp_protected_session *arb = &pxp->ctx.arb_session;
+
+ arb->context_id = pxp->ctx.id;
+ arb->type = ARB_SESSION_TYPE;
+ arb->protection_mode = ARB_PROTECTION_MODE;
+ arb->index = ARB_SESSION_INDEX;
+ arb->is_in_play = false;
+}
+
+int intel_pxp_arb_reserve_session(struct intel_pxp *pxp)
+{
+ int ret;
+
+ lockdep_assert_held(&pxp->ctx.mutex);
+
+ arb_session_entry_init(pxp);
+ ret = wait_arb_hw_sw_state(pxp);
+
+ return ret;
+}
+
+/**
+ * intel_pxp_arb_mark_session_in_play - To put an reserved protected session to "in_play" state
+ * @pxp: pointer to pxp struct.
+ *
+ * Return: status. 0 means update is successful.
+ */
+static int intel_pxp_arb_mark_session_in_play(struct intel_pxp *pxp)
+{
+ struct pxp_protected_session *arb = &pxp->ctx.arb_session;
+
+ lockdep_assert_held(&pxp->ctx.mutex);
+
+ if (arb->is_in_play)
+ return -EINVAL;
+
+ arb->is_in_play = true;
+ return 0;
+}
+
+int intel_pxp_arb_create_session(struct intel_pxp *pxp)
+{
+ int ret;
+ struct intel_gt *gt = container_of(pxp, typeof(*gt), pxp);
+
+ lockdep_assert_held(&pxp->ctx.mutex);
+
+ if (pxp->ctx.flag_display_hm_surface_keys) {
+ drm_err(>->i915->drm, "%s: arb session is alive so skipping the creation\n",
+ __func__);
+ return 0;
+ }
+
+ ret = intel_pxp_arb_reserve_session(pxp);
+ if (ret) {
+ drm_err(>->i915->drm, "Failed to reserve arb session\n");
+ goto end;
+ }
+
+ ret = intel_pxp_tee_cmd_create_arb_session(pxp);
+ if (ret) {
+ drm_err(>->i915->drm, "Failed to send tee cmd for arb session creation\n");
+ goto end;
+ }
+
+ ret = intel_pxp_arb_mark_session_in_play(pxp);
+ if (ret) {
+ drm_err(>->i915->drm, "Failed to mark arb session status in play\n");
+ goto end;
+ }
+
+ pxp->ctx.flag_display_hm_surface_keys = true;
+
+end:
+ return ret;
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_arb.h b/drivers/gpu/drm/i915/pxp/intel_pxp_arb.h
new file mode 100644
index 000000000000..c6a6000f5be5
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_arb.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright(c) 2020, Intel Corporation. All rights reserved.
+ */
+
+#ifndef __INTEL_PXP_ARB_H__
+#define __INTEL_PXP_ARB_H__
+
+#include <linux/types.h>
+
+struct intel_pxp;
+
+/**
+ * struct pxp_protected_session - structure to track all active sessions.
+ */
+struct pxp_protected_session {
+ /** @index: Numeric identifier for this protected session */
+ int index;
+ /** @type: Type of session */
+ int type;
+ /** @protection_mode: mode of protection requested */
+ int protection_mode;
+ /** @context_id: context identifier of the protected session requestor */
+ int context_id;
+
+ /**
+ * @is_in_play: indicates whether the session has been established
+ * in the HW root of trust if this flag is false, it
+ * indicates an application has reserved this session,
+ * but has not * established the session in the
+ * hardware yet.
+ */
+ bool is_in_play;
+};
+
+int intel_pxp_arb_create_session(struct intel_pxp *pxp);
+
+#endif /* __INTEL_PXP_ARB_H__ */
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
index 953a2e700931..b1d0bc905320 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_context.h
@@ -7,13 +7,19 @@
#define __INTEL_PXP_CONTEXT_H__
#include <linux/mutex.h>
+#include "intel_pxp_arb.h"
/* struct pxp_context - Represents combined view of driver and logical HW states. */
struct pxp_context {
/** @mutex: mutex to protect the pxp context */
struct mutex mutex;
+ struct pxp_protected_session arb_session;
+ u32 arb_session_pxp_tag;
+
int id;
+
+ bool flag_display_hm_surface_keys;
};
void intel_pxp_ctx_init(struct pxp_context *ctx);
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
index ca6b61099aee..816a6d5a54e4 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
@@ -10,6 +10,7 @@
#include "intel_pxp.h"
#include "intel_pxp_context.h"
#include "intel_pxp_tee.h"
+#include "intel_pxp_arb.h"
static int intel_pxp_tee_io_message(struct intel_pxp *pxp,
void *msg_in, u32 msg_in_size,
@@ -70,7 +71,9 @@ static int intel_pxp_tee_io_message(struct intel_pxp *pxp,
static int i915_pxp_tee_component_bind(struct device *i915_kdev,
struct device *tee_kdev, void *data)
{
+ int ret;
struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
+ struct intel_pxp *pxp = &i915->gt.pxp;
if (!i915 || !tee_kdev || !data)
return -EPERM;
@@ -80,6 +83,16 @@ static int i915_pxp_tee_component_bind(struct device *i915_kdev,
i915->pxp_tee_master->tee_dev = tee_kdev;
mutex_unlock(&i915->pxp_tee_comp_mutex);
+ mutex_lock(&pxp->ctx.mutex);
+ /* Create arb session only if tee is ready, during system boot or sleep/resume */
+ ret = intel_pxp_arb_create_session(pxp);
+ mutex_unlock(&pxp->ctx.mutex);
+
+ if (ret) {
+ drm_err(&i915->drm, "Failed to create arb session ret=[%d]\n", ret);
+ return ret;
+ }
+
return 0;
}
@@ -130,3 +143,28 @@ void intel_pxp_tee_component_fini(struct intel_pxp *pxp)
component_del(i915->drm.dev, &i915_pxp_tee_component_ops);
}
+
+int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp)
+{
+ int ret;
+ u32 msg_out_size_received = 0;
+ u32 msg_in[PXP_TEE_ARB_CMD_DW_LEN] = PXP_TEE_ARB_CMD_BIN;
+ u32 msg_out[PXP_TEE_ARB_CMD_DW_LEN] = {0};
+ struct intel_gt *gt = container_of(pxp, typeof(*gt), pxp);
+ struct drm_i915_private *i915 = gt->i915;
+
+ mutex_lock(&i915->pxp_tee_comp_mutex);
+
+ ret = intel_pxp_tee_io_message(pxp,
+ &msg_in,
+ sizeof(msg_in),
+ &msg_out, &msg_out_size_received,
+ sizeof(msg_out));
+
+ mutex_unlock(&i915->pxp_tee_comp_mutex);
+
+ if (ret)
+ drm_err(&i915->drm, "Failed to send/receive tee message\n");
+
+ return ret;
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.h b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.h
index 4b5e3edb1d9b..757a54208a4d 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.h
@@ -11,4 +11,10 @@
void intel_pxp_tee_component_init(struct intel_pxp *pxp);
void intel_pxp_tee_component_fini(struct intel_pxp *pxp);
+int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp);
+
+/* TEE command to create the arbitrary session */
+#define PXP_TEE_ARB_CMD_BIN {0x00040000, 0x0000001e, 0x00000000, 0x00000008, 0x00000002, 0x0000000f}
+#define PXP_TEE_ARB_CMD_DW_LEN (6)
+
#endif /* __INTEL_PXP_TEE_H__ */
--
2.17.1
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