Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
new file mode 100644
index 0000000000..0a3e66b026
--- /dev/null
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2020, Intel Corporation. All rights reserved.
+ */
+
+#include "i915_drv.h"
+
+#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"
+#include "intel_pxp_regs.h"
+
+#define ARB_SESSION I915_PROTECTED_CONTENT_DEFAULT_SESSION /* shorter define */
+
+static bool intel_pxp_session_is_in_play(struct intel_pxp *pxp, u32 id)
+{
+	struct intel_uncore *uncore = pxp->ctrl_gt->uncore;
+	intel_wakeref_t wakeref;
+	u32 sip = 0;
+
+	/* if we're suspended the session is considered off */
+	with_intel_runtime_pm_if_in_use(uncore->rpm, wakeref)
+		sip = intel_uncore_read(uncore, KCR_SIP(pxp->kcr_base));
+
+	return sip & BIT(id);
+}
+
+static int pxp_wait_for_session_state(struct intel_pxp *pxp, u32 id, bool in_play)
+{
+	struct intel_uncore *uncore = pxp->ctrl_gt->uncore;
+	intel_wakeref_t wakeref;
+	u32 mask = BIT(id);
+	int ret;
+
+	/* if we're suspended the session is considered off */
+	wakeref = intel_runtime_pm_get_if_in_use(uncore->rpm);
+	if (!wakeref)
+		return in_play ? -ENODEV : 0;
+
+	ret = intel_wait_for_register(uncore,
+				      KCR_SIP(pxp->kcr_base),
+				      mask,
+				      in_play ? mask : 0,
+				      250);
+
+	intel_runtime_pm_put(uncore->rpm, wakeref);
+
+	return ret;
+}
+
+static int pxp_create_arb_session(struct intel_pxp *pxp)
+{
+	struct intel_gt *gt = pxp->ctrl_gt;
+	int ret;
+
+	pxp->arb_is_valid = false;
+
+	if (intel_pxp_session_is_in_play(pxp, ARB_SESSION)) {
+		drm_err(&gt->i915->drm, "arb session already in play at creation time\n");
+		return -EEXIST;
+	}
+
+	if (HAS_ENGINE(pxp->ctrl_gt, GSC0))
+		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;
+	}
+
+	ret = pxp_wait_for_session_state(pxp, ARB_SESSION, true);
+	if (ret) {
+		drm_dbg(&gt->i915->drm, "arb session failed to go in play\n");
+		return ret;
+	}
+	drm_dbg(&gt->i915->drm, "PXP ARB session is alive\n");
+
+	if (!++pxp->key_instance)
+		++pxp->key_instance;
+
+	pxp->arb_is_valid = true;
+
+	return 0;
+}
+
+static int pxp_terminate_arb_session_and_global(struct intel_pxp *pxp)
+{
+	int ret;
+	struct intel_gt *gt = pxp->ctrl_gt;
+
+	/* must mark termination in progress calling this function */
+	GEM_WARN_ON(pxp->arb_is_valid);
+
+	/* terminate the hw sessions */
+	ret = intel_pxp_terminate_session(pxp, ARB_SESSION);
+	if (ret) {
+		drm_err(&gt->i915->drm, "Failed to submit session termination\n");
+		return ret;
+	}
+
+	ret = pxp_wait_for_session_state(pxp, ARB_SESSION, false);
+	if (ret) {
+		drm_err(&gt->i915->drm, "Session state did not clear\n");
+		return ret;
+	}
+
+	intel_uncore_write(gt->uncore, KCR_GLOBAL_TERMINATE(pxp->kcr_base), 1);
+
+	if (HAS_ENGINE(gt, GSC0))
+		intel_pxp_gsccs_end_arb_fw_session(pxp, ARB_SESSION);
+	else
+		intel_pxp_tee_end_arb_fw_session(pxp, ARB_SESSION);
+
+	return ret;
+}
+
+void intel_pxp_terminate(struct intel_pxp *pxp, bool post_invalidation_needs_restart)
+{
+	int ret;
+
+	pxp->hw_state_invalidated = post_invalidation_needs_restart;
+
+	/*
+	 * if we fail to submit the termination there is no point in waiting for
+	 * it to complete. PXP will be marked as non-active until the next
+	 * termination is issued.
+	 */
+	ret = pxp_terminate_arb_session_and_global(pxp);
+	if (ret)
+		complete_all(&pxp->termination);
+}
+
+static void pxp_terminate_complete(struct intel_pxp *pxp)
+{
+	/* Re-create the arb session after teardown handle complete */
+	if (fetch_and_zero(&pxp->hw_state_invalidated))
+		pxp_create_arb_session(pxp);
+
+	complete_all(&pxp->termination);
+}
+
+static void pxp_session_work(struct work_struct *work)
+{
+	struct intel_pxp *pxp = container_of(work, typeof(*pxp), session_work);
+	struct intel_gt *gt = pxp->ctrl_gt;
+	intel_wakeref_t wakeref;
+	u32 events = 0;
+
+	spin_lock_irq(gt->irq_lock);
+	events = fetch_and_zero(&pxp->session_events);
+	spin_unlock_irq(gt->irq_lock);
+
+	if (!events)
+		return;
+
+	if (events & PXP_INVAL_REQUIRED)
+		intel_pxp_invalidate(pxp);
+
+	/*
+	 * If we're processing an event while suspending then don't bother,
+	 * we're going to re-init everything on resume anyway.
+	 */
+	wakeref = intel_runtime_pm_get_if_in_use(gt->uncore->rpm);
+	if (!wakeref)
+		return;
+
+	if (events & PXP_TERMINATION_REQUEST) {
+		events &= ~PXP_TERMINATION_COMPLETE;
+		intel_pxp_terminate(pxp, true);
+	}
+
+	if (events & PXP_TERMINATION_COMPLETE)
+		pxp_terminate_complete(pxp);
+
+	intel_runtime_pm_put(gt->uncore->rpm, wakeref);
+}
+
+void intel_pxp_session_management_init(struct intel_pxp *pxp)
+{
+	mutex_init(&pxp->arb_mutex);
+	INIT_WORK(&pxp->session_work, pxp_session_work);
+}