Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 266 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
new file mode 100644
index 000000000..3bb8838e3
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2016-2019 Intel Corporation
+ */
+
+#include <linux/types.h>
+
+#include "gt/intel_gt.h"
+#include "intel_guc_reg.h"
+#include "intel_huc.h"
+#include "i915_drv.h"
+
+/**
+ * DOC: HuC
+ *
+ * The HuC is a dedicated microcontroller for usage in media HEVC (High
+ * Efficiency Video Coding) operations. Userspace can directly use the firmware
+ * capabilities by adding HuC specific commands to batch buffers.
+ *
+ * The kernel driver is only responsible for loading the HuC firmware and
+ * triggering its security authentication, which is performed by the GuC on
+ * older platforms and by the GSC on newer ones. For the GuC to correctly
+ * perform the authentication, the HuC binary must be loaded before the GuC one.
+ * Loading the HuC is optional; however, not using the HuC might negatively
+ * impact power usage and/or performance of media workloads, depending on the
+ * use-cases.
+ * HuC must be reloaded on events that cause the WOPCM to lose its contents
+ * (S3/S4, FLR); GuC-authenticated HuC must also be reloaded on GuC/GT reset,
+ * while GSC-managed HuC will survive that.
+ *
+ * See https://github.com/intel/media-driver for the latest details on HuC
+ * functionality.
+ */
+
+/**
+ * DOC: HuC Memory Management
+ *
+ * Similarly to the GuC, the HuC can't do any memory allocations on its own,
+ * with the difference being that the allocations for HuC usage are handled by
+ * the userspace driver instead of the kernel one. The HuC accesses the memory
+ * via the PPGTT belonging to the context loaded on the VCS executing the
+ * HuC-specific commands.
+ */
+
+void intel_huc_init_early(struct intel_huc *huc)
+{
+	struct drm_i915_private *i915 = huc_to_gt(huc)->i915;
+
+	intel_uc_fw_init_early(&huc->fw, INTEL_UC_FW_TYPE_HUC);
+
+	if (GRAPHICS_VER(i915) >= 11) {
+		huc->status.reg = GEN11_HUC_KERNEL_LOAD_INFO;
+		huc->status.mask = HUC_LOAD_SUCCESSFUL;
+		huc->status.value = HUC_LOAD_SUCCESSFUL;
+	} else {
+		huc->status.reg = HUC_STATUS2;
+		huc->status.mask = HUC_FW_VERIFIED;
+		huc->status.value = HUC_FW_VERIFIED;
+	}
+}
+
+#define HUC_LOAD_MODE_STRING(x) (x ? "GSC" : "legacy")
+static int check_huc_loading_mode(struct intel_huc *huc)
+{
+	struct intel_gt *gt = huc_to_gt(huc);
+	bool fw_needs_gsc = intel_huc_is_loaded_by_gsc(huc);
+	bool hw_uses_gsc = false;
+
+	/*
+	 * The fuse for HuC load via GSC is only valid on platforms that have
+	 * GuC deprivilege.
+	 */
+	if (HAS_GUC_DEPRIVILEGE(gt->i915))
+		hw_uses_gsc = intel_uncore_read(gt->uncore, GUC_SHIM_CONTROL2) &
+			      GSC_LOADS_HUC;
+
+	if (fw_needs_gsc != hw_uses_gsc) {
+		drm_err(&gt->i915->drm,
+			"mismatch between HuC FW (%s) and HW (%s) load modes\n",
+			HUC_LOAD_MODE_STRING(fw_needs_gsc),
+			HUC_LOAD_MODE_STRING(hw_uses_gsc));
+		return -ENOEXEC;
+	}
+
+	/* make sure we can access the GSC via the mei driver if we need it */
+	if (!(IS_ENABLED(CONFIG_INTEL_MEI_PXP) && IS_ENABLED(CONFIG_INTEL_MEI_GSC)) &&
+	    fw_needs_gsc) {
+		drm_info(&gt->i915->drm,
+			 "Can't load HuC due to missing MEI modules\n");
+		return -EIO;
+	}
+
+	drm_dbg(&gt->i915->drm, "GSC loads huc=%s\n", str_yes_no(fw_needs_gsc));
+
+	return 0;
+}
+
+int intel_huc_init(struct intel_huc *huc)
+{
+	struct drm_i915_private *i915 = huc_to_gt(huc)->i915;
+	int err;
+
+	err = check_huc_loading_mode(huc);
+	if (err)
+		goto out;
+
+	err = intel_uc_fw_init(&huc->fw);
+	if (err)
+		goto out;
+
+	intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_LOADABLE);
+
+	return 0;
+
+out:
+	drm_info(&i915->drm, "HuC init failed with %d\n", err);
+	return err;
+}
+
+void intel_huc_fini(struct intel_huc *huc)
+{
+	if (!intel_uc_fw_is_loadable(&huc->fw))
+		return;
+
+	intel_uc_fw_fini(&huc->fw);
+}
+
+/**
+ * intel_huc_auth() - Authenticate HuC uCode
+ * @huc: intel_huc structure
+ *
+ * Called after HuC and GuC firmware loading during intel_uc_init_hw().
+ *
+ * This function invokes the GuC action to authenticate the HuC firmware,
+ * passing the offset of the RSA signature to intel_guc_auth_huc(). It then
+ * waits for up to 50ms for firmware verification ACK.
+ */
+int intel_huc_auth(struct intel_huc *huc)
+{
+	struct intel_gt *gt = huc_to_gt(huc);
+	struct intel_guc *guc = &gt->uc.guc;
+	int ret;
+
+	if (!intel_uc_fw_is_loaded(&huc->fw))
+		return -ENOEXEC;
+
+	/* GSC will do the auth */
+	if (intel_huc_is_loaded_by_gsc(huc))
+		return -ENODEV;
+
+	ret = i915_inject_probe_error(gt->i915, -ENXIO);
+	if (ret)
+		goto fail;
+
+	GEM_BUG_ON(intel_uc_fw_is_running(&huc->fw));
+
+	ret = intel_guc_auth_huc(guc, intel_guc_ggtt_offset(guc, huc->fw.rsa_data));
+	if (ret) {
+		DRM_ERROR("HuC: GuC did not ack Auth request %d\n", ret);
+		goto fail;
+	}
+
+	/* Check authentication status, it should be done by now */
+	ret = __intel_wait_for_register(gt->uncore,
+					huc->status.reg,
+					huc->status.mask,
+					huc->status.value,
+					2, 50, NULL);
+	if (ret) {
+		DRM_ERROR("HuC: Firmware not verified %d\n", ret);
+		goto fail;
+	}
+
+	intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_RUNNING);
+	drm_info(&gt->i915->drm, "HuC authenticated\n");
+	return 0;
+
+fail:
+	i915_probe_error(gt->i915, "HuC: Authentication failed %d\n", ret);
+	intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_LOAD_FAIL);
+	return ret;
+}
+
+static bool huc_is_authenticated(struct intel_huc *huc)
+{
+	struct intel_gt *gt = huc_to_gt(huc);
+	intel_wakeref_t wakeref;
+	u32 status = 0;
+
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		status = intel_uncore_read(gt->uncore, huc->status.reg);
+
+	return (status & huc->status.mask) == huc->status.value;
+}
+
+/**
+ * intel_huc_check_status() - check HuC status
+ * @huc: intel_huc structure
+ *
+ * This function reads status register to verify if HuC
+ * firmware was successfully loaded.
+ *
+ * Returns:
+ *  * -ENODEV if HuC is not present on this platform,
+ *  * -EOPNOTSUPP if HuC firmware is disabled,
+ *  * -ENOPKG if HuC firmware was not installed,
+ *  * -ENOEXEC if HuC firmware is invalid or mismatched,
+ *  * 0 if HuC firmware is not running,
+ *  * 1 if HuC firmware is authenticated and running.
+ */
+int intel_huc_check_status(struct intel_huc *huc)
+{
+	switch (__intel_uc_fw_status(&huc->fw)) {
+	case INTEL_UC_FIRMWARE_NOT_SUPPORTED:
+		return -ENODEV;
+	case INTEL_UC_FIRMWARE_DISABLED:
+		return -EOPNOTSUPP;
+	case INTEL_UC_FIRMWARE_MISSING:
+		return -ENOPKG;
+	case INTEL_UC_FIRMWARE_ERROR:
+		return -ENOEXEC;
+	default:
+		break;
+	}
+
+	return huc_is_authenticated(huc);
+}
+
+void intel_huc_update_auth_status(struct intel_huc *huc)
+{
+	if (!intel_uc_fw_is_loadable(&huc->fw))
+		return;
+
+	if (huc_is_authenticated(huc))
+		intel_uc_fw_change_status(&huc->fw,
+					  INTEL_UC_FIRMWARE_RUNNING);
+}
+
+/**
+ * intel_huc_load_status - dump information about HuC load status
+ * @huc: the HuC
+ * @p: the &drm_printer
+ *
+ * Pretty printer for HuC load status.
+ */
+void intel_huc_load_status(struct intel_huc *huc, struct drm_printer *p)
+{
+	struct intel_gt *gt = huc_to_gt(huc);
+	intel_wakeref_t wakeref;
+
+	if (!intel_huc_is_supported(huc)) {
+		drm_printf(p, "HuC not supported\n");
+		return;
+	}
+
+	if (!intel_huc_is_wanted(huc)) {
+		drm_printf(p, "HuC disabled\n");
+		return;
+	}
+
+	intel_uc_fw_dump(&huc->fw, p);
+
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		drm_printf(p, "HuC status: 0x%08x\n",
+			   intel_uncore_read(gt->uncore, huc->status.reg));
+}