Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 179 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
new file mode 100644
index 000000000..4b6f5655f
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2020 Intel Corporation.
+ */
+
+#include <linux/component.h>
+
+#include <drm/i915_pxp_tee_interface.h>
+#include <drm/i915_component.h>
+
+#include "i915_drv.h"
+#include "intel_pxp.h"
+#include "intel_pxp_session.h"
+#include "intel_pxp_tee.h"
+#include "intel_pxp_tee_interface.h"
+
+static inline struct intel_pxp *i915_dev_to_pxp(struct device *i915_kdev)
+{
+	struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
+
+	return &to_gt(i915)->pxp;
+}
+
+static int intel_pxp_tee_io_message(struct intel_pxp *pxp,
+				    void *msg_in, u32 msg_in_size,
+				    void *msg_out, u32 msg_out_max_size,
+				    u32 *msg_out_rcv_size)
+{
+	struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915;
+	struct i915_pxp_component *pxp_component = pxp->pxp_component;
+	int ret = 0;
+
+	mutex_lock(&pxp->tee_mutex);
+
+	/*
+	 * The binding of the component is asynchronous from i915 probe, so we
+	 * can't be sure it has happened.
+	 */
+	if (!pxp_component) {
+		ret = -ENODEV;
+		goto unlock;
+	}
+
+	ret = pxp_component->ops->send(pxp_component->tee_dev, msg_in, msg_in_size);
+	if (ret) {
+		drm_err(&i915->drm, "Failed to send PXP TEE message\n");
+		goto unlock;
+	}
+
+	ret = pxp_component->ops->recv(pxp_component->tee_dev, msg_out, msg_out_max_size);
+	if (ret < 0) {
+		drm_err(&i915->drm, "Failed to receive PXP TEE message\n");
+		goto unlock;
+	}
+
+	if (ret > msg_out_max_size) {
+		drm_err(&i915->drm,
+			"Failed to receive PXP TEE message due to unexpected output size\n");
+		ret = -ENOSPC;
+		goto unlock;
+	}
+
+	if (msg_out_rcv_size)
+		*msg_out_rcv_size = ret;
+
+	ret = 0;
+unlock:
+	mutex_unlock(&pxp->tee_mutex);
+	return ret;
+}
+
+/**
+ * i915_pxp_tee_component_bind - bind function to pass the function pointers to pxp_tee
+ * @i915_kdev: pointer to i915 kernel device
+ * @tee_kdev: pointer to tee kernel device
+ * @data: pointer to pxp_tee_master containing the function pointers
+ *
+ * This bind function is called during the system boot or resume from system sleep.
+ *
+ * Return: return 0 if successful.
+ */
+static int i915_pxp_tee_component_bind(struct device *i915_kdev,
+				       struct device *tee_kdev, void *data)
+{
+	struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
+	struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev);
+	intel_wakeref_t wakeref;
+
+	mutex_lock(&pxp->tee_mutex);
+	pxp->pxp_component = data;
+	pxp->pxp_component->tee_dev = tee_kdev;
+	mutex_unlock(&pxp->tee_mutex);
+
+	/* if we are suspended, the HW will be re-initialized on resume */
+	wakeref = intel_runtime_pm_get_if_in_use(&i915->runtime_pm);
+	if (!wakeref)
+		return 0;
+
+	/* the component is required to fully start the PXP HW */
+	intel_pxp_init_hw(pxp);
+
+	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
+
+	return 0;
+}
+
+static void i915_pxp_tee_component_unbind(struct device *i915_kdev,
+					  struct device *tee_kdev, void *data)
+{
+	struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
+	struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev);
+	intel_wakeref_t wakeref;
+
+	with_intel_runtime_pm_if_in_use(&i915->runtime_pm, wakeref)
+		intel_pxp_fini_hw(pxp);
+
+	mutex_lock(&pxp->tee_mutex);
+	pxp->pxp_component = NULL;
+	mutex_unlock(&pxp->tee_mutex);
+}
+
+static const struct component_ops i915_pxp_tee_component_ops = {
+	.bind   = i915_pxp_tee_component_bind,
+	.unbind = i915_pxp_tee_component_unbind,
+};
+
+int intel_pxp_tee_component_init(struct intel_pxp *pxp)
+{
+	int ret;
+	struct intel_gt *gt = pxp_to_gt(pxp);
+	struct drm_i915_private *i915 = gt->i915;
+
+	ret = component_add_typed(i915->drm.dev, &i915_pxp_tee_component_ops,
+				  I915_COMPONENT_PXP);
+	if (ret < 0) {
+		drm_err(&i915->drm, "Failed to add PXP component (%d)\n", ret);
+		return ret;
+	}
+
+	pxp->pxp_component_added = true;
+
+	return 0;
+}
+
+void intel_pxp_tee_component_fini(struct intel_pxp *pxp)
+{
+	struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915;
+
+	if (!pxp->pxp_component_added)
+		return;
+
+	component_del(i915->drm.dev, &i915_pxp_tee_component_ops);
+	pxp->pxp_component_added = false;
+}
+
+int intel_pxp_tee_cmd_create_arb_session(struct intel_pxp *pxp,
+					 int arb_session_id)
+{
+	struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915;
+	struct pxp_tee_create_arb_in msg_in = {0};
+	struct pxp_tee_create_arb_out msg_out = {0};
+	int ret;
+
+	msg_in.header.api_version = PXP_TEE_APIVER;
+	msg_in.header.command_id = PXP_TEE_ARB_CMDID;
+	msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
+	msg_in.protection_mode = PXP_TEE_ARB_PROTECTION_MODE;
+	msg_in.session_id = arb_session_id;
+
+	ret = intel_pxp_tee_io_message(pxp,
+				       &msg_in, sizeof(msg_in),
+				       &msg_out, sizeof(msg_out),
+				       NULL);
+
+	if (ret)
+		drm_err(&i915->drm, "Failed to send tee msg ret=[%d]\n", ret);
+
+	return ret;
+}