1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_huc.c b/drivers/gpu/drm/xe/xe_huc.c
new file mode 100644
index 000000000000..0a70c8924582
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_huc.c
@@ -0,0 +1,318 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "xe_huc.h"
+
+#include <linux/delay.h>
+
+#include <drm/drm_managed.h>
+
+#include "abi/gsc_pxp_commands_abi.h"
+#include "regs/xe_gsc_regs.h"
+#include "regs/xe_guc_regs.h"
+#include "xe_assert.h"
+#include "xe_bo.h"
+#include "xe_device.h"
+#include "xe_force_wake.h"
+#include "xe_gsc_submit.h"
+#include "xe_gt.h"
+#include "xe_gt_printk.h"
+#include "xe_guc.h"
+#include "xe_map.h"
+#include "xe_mmio.h"
+#include "xe_sriov.h"
+#include "xe_uc_fw.h"
+
+static struct xe_gt *
+huc_to_gt(struct xe_huc *huc)
+{
+	return container_of(huc, struct xe_gt, uc.huc);
+}
+
+static struct xe_device *
+huc_to_xe(struct xe_huc *huc)
+{
+	return gt_to_xe(huc_to_gt(huc));
+}
+
+static struct xe_guc *
+huc_to_guc(struct xe_huc *huc)
+{
+	return &container_of(huc, struct xe_uc, huc)->guc;
+}
+
+#define PXP43_HUC_AUTH_INOUT_SIZE SZ_4K
+static int huc_alloc_gsc_pkt(struct xe_huc *huc)
+{
+	struct xe_gt *gt = huc_to_gt(huc);
+	struct xe_device *xe = gt_to_xe(gt);
+	struct xe_bo *bo;
+
+	/* we use a single object for both input and output */
+	bo = xe_managed_bo_create_pin_map(xe, gt_to_tile(gt),
+					  PXP43_HUC_AUTH_INOUT_SIZE * 2,
+					  XE_BO_FLAG_SYSTEM |
+					  XE_BO_FLAG_GGTT);
+	if (IS_ERR(bo))
+		return PTR_ERR(bo);
+
+	huc->gsc_pkt = bo;
+
+	return 0;
+}
+
+int xe_huc_init(struct xe_huc *huc)
+{
+	struct xe_gt *gt = huc_to_gt(huc);
+	struct xe_device *xe = gt_to_xe(gt);
+	int ret;
+
+	huc->fw.type = XE_UC_FW_TYPE_HUC;
+
+	/*
+	 * The HuC is only available on the media GT on most platforms.  The
+	 * exception to that rule are the old Xe1 platforms where there was
+	 * no separate GT for media IP, so the HuC was part of the primary
+	 * GT.  Such platforms have graphics versions 12.55 and earlier.
+	 */
+	if (!xe_gt_is_media_type(gt) && GRAPHICS_VERx100(xe) > 1255) {
+		xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_NOT_SUPPORTED);
+		return 0;
+	}
+
+	ret = xe_uc_fw_init(&huc->fw);
+	if (ret)
+		goto out;
+
+	if (!xe_uc_fw_is_enabled(&huc->fw))
+		return 0;
+
+	if (IS_SRIOV_VF(xe))
+		return 0;
+
+	if (huc->fw.has_gsc_headers) {
+		ret = huc_alloc_gsc_pkt(huc);
+		if (ret)
+			goto out;
+	}
+
+	xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_LOADABLE);
+
+	return 0;
+
+out:
+	xe_gt_err(gt, "HuC: initialization failed: %pe\n", ERR_PTR(ret));
+	return ret;
+}
+
+int xe_huc_init_post_hwconfig(struct xe_huc *huc)
+{
+	struct xe_tile *tile = gt_to_tile(huc_to_gt(huc));
+	struct xe_device *xe = huc_to_xe(huc);
+	int ret;
+
+	if (!IS_DGFX(huc_to_xe(huc)))
+		return 0;
+
+	if (!xe_uc_fw_is_loadable(&huc->fw))
+		return 0;
+
+	ret = xe_managed_bo_reinit_in_vram(xe, tile, &huc->fw.bo);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+int xe_huc_upload(struct xe_huc *huc)
+{
+	if (!xe_uc_fw_is_loadable(&huc->fw))
+		return 0;
+	return xe_uc_fw_upload(&huc->fw, 0, HUC_UKERNEL);
+}
+
+#define huc_auth_msg_wr(xe_, map_, offset_, field_, val_) \
+	xe_map_wr_field(xe_, map_, offset_, struct pxp43_new_huc_auth_in, field_, val_)
+#define huc_auth_msg_rd(xe_, map_, offset_, field_) \
+	xe_map_rd_field(xe_, map_, offset_, struct pxp43_huc_auth_out, field_)
+
+static u32 huc_emit_pxp_auth_msg(struct xe_device *xe, struct iosys_map *map,
+				 u32 wr_offset, u32 huc_offset, u32 huc_size)
+{
+	xe_map_memset(xe, map, wr_offset, 0, sizeof(struct pxp43_new_huc_auth_in));
+
+	huc_auth_msg_wr(xe, map, wr_offset, header.api_version, PXP_APIVER(4, 3));
+	huc_auth_msg_wr(xe, map, wr_offset, header.command_id, PXP43_CMDID_NEW_HUC_AUTH);
+	huc_auth_msg_wr(xe, map, wr_offset, header.status, 0);
+	huc_auth_msg_wr(xe, map, wr_offset, header.buffer_len,
+			sizeof(struct pxp43_new_huc_auth_in) - sizeof(struct pxp_cmd_header));
+	huc_auth_msg_wr(xe, map, wr_offset, huc_base_address, huc_offset);
+	huc_auth_msg_wr(xe, map, wr_offset, huc_size, huc_size);
+
+	return wr_offset + sizeof(struct pxp43_new_huc_auth_in);
+}
+
+static int huc_auth_via_gsccs(struct xe_huc *huc)
+{
+	struct xe_gt *gt = huc_to_gt(huc);
+	struct xe_device *xe = gt_to_xe(gt);
+	struct xe_bo *pkt = huc->gsc_pkt;
+	u32 wr_offset;
+	u32 rd_offset;
+	u64 ggtt_offset;
+	u32 out_status;
+	int retry = 5;
+	int err = 0;
+
+	if (!pkt)
+		return -ENODEV;
+
+	ggtt_offset = xe_bo_ggtt_addr(pkt);
+
+	wr_offset = xe_gsc_emit_header(xe, &pkt->vmap, 0, HECI_MEADDRESS_PXP, 0,
+				       sizeof(struct pxp43_new_huc_auth_in));
+	wr_offset = huc_emit_pxp_auth_msg(xe, &pkt->vmap, wr_offset,
+					  xe_bo_ggtt_addr(huc->fw.bo),
+					  xe_bo_size(huc->fw.bo));
+	do {
+		err = xe_gsc_pkt_submit_kernel(&gt->uc.gsc, ggtt_offset, wr_offset,
+					       ggtt_offset + PXP43_HUC_AUTH_INOUT_SIZE,
+					       PXP43_HUC_AUTH_INOUT_SIZE);
+		if (err)
+			break;
+
+		if (xe_gsc_check_and_update_pending(xe, &pkt->vmap, 0, &pkt->vmap,
+						    PXP43_HUC_AUTH_INOUT_SIZE)) {
+			err = -EBUSY;
+			msleep(50);
+		}
+	} while (--retry && err == -EBUSY);
+
+	if (err) {
+		xe_gt_err(gt, "HuC: failed to submit GSC request to auth: %pe\n", ERR_PTR(err));
+		return err;
+	}
+
+	err = xe_gsc_read_out_header(xe, &pkt->vmap, PXP43_HUC_AUTH_INOUT_SIZE,
+				     sizeof(struct pxp43_huc_auth_out), &rd_offset);
+	if (err) {
+		xe_gt_err(gt, "HuC: invalid GSC reply for auth: %pe\n", ERR_PTR(err));
+		return err;
+	}
+
+	/*
+	 * The GSC will return PXP_STATUS_OP_NOT_PERMITTED if the HuC is already
+	 * authenticated. If the same error is ever returned with HuC not loaded
+	 * we'll still catch it when we check the authentication bit later.
+	 */
+	out_status = huc_auth_msg_rd(xe, &pkt->vmap, rd_offset, header.status);
+	if (out_status != PXP_STATUS_SUCCESS && out_status != PXP_STATUS_OP_NOT_PERMITTED) {
+		xe_gt_err(gt, "HuC: authentication failed with GSC error = %#x\n", out_status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static const struct {
+	const char *name;
+	struct xe_reg reg;
+	u32 val;
+} huc_auth_modes[XE_HUC_AUTH_TYPES_COUNT] = {
+	[XE_HUC_AUTH_VIA_GUC] = { "GuC",
+				  HUC_KERNEL_LOAD_INFO,
+				  HUC_LOAD_SUCCESSFUL },
+	[XE_HUC_AUTH_VIA_GSC] = { "GSC",
+				  HECI_FWSTS5(MTL_GSC_HECI1_BASE),
+				  HECI1_FWSTS5_HUC_AUTH_DONE },
+};
+
+bool xe_huc_is_authenticated(struct xe_huc *huc, enum xe_huc_auth_types type)
+{
+	struct xe_gt *gt = huc_to_gt(huc);
+
+	return xe_mmio_read32(&gt->mmio, huc_auth_modes[type].reg) & huc_auth_modes[type].val;
+}
+
+int xe_huc_auth(struct xe_huc *huc, enum xe_huc_auth_types type)
+{
+	struct xe_gt *gt = huc_to_gt(huc);
+	struct xe_guc *guc = huc_to_guc(huc);
+	int ret;
+
+	if (!xe_uc_fw_is_loadable(&huc->fw))
+		return 0;
+
+	/* On newer platforms the HuC survives reset, so no need to re-auth */
+	if (xe_huc_is_authenticated(huc, type)) {
+		xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_RUNNING);
+		return 0;
+	}
+
+	if (!xe_uc_fw_is_loaded(&huc->fw))
+		return -ENOEXEC;
+
+	switch (type) {
+	case XE_HUC_AUTH_VIA_GUC:
+		ret = xe_guc_auth_huc(guc, xe_bo_ggtt_addr(huc->fw.bo) +
+				      xe_uc_fw_rsa_offset(&huc->fw));
+		break;
+	case XE_HUC_AUTH_VIA_GSC:
+		ret = huc_auth_via_gsccs(huc);
+		break;
+	default:
+		XE_WARN_ON(type);
+		return -EINVAL;
+	}
+	if (ret) {
+		xe_gt_err(gt, "HuC: failed to trigger auth via %s: %pe\n",
+			  huc_auth_modes[type].name, ERR_PTR(ret));
+		goto fail;
+	}
+
+	ret = xe_mmio_wait32(&gt->mmio, huc_auth_modes[type].reg, huc_auth_modes[type].val,
+			     huc_auth_modes[type].val, 100000, NULL, false);
+	if (ret) {
+		xe_gt_err(gt, "HuC: firmware not verified: %pe\n", ERR_PTR(ret));
+		goto fail;
+	}
+
+	xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_RUNNING);
+	xe_gt_dbg(gt, "HuC: authenticated via %s\n", huc_auth_modes[type].name);
+
+	return 0;
+
+fail:
+	xe_gt_err(gt, "HuC: authentication via %s failed: %pe\n",
+		  huc_auth_modes[type].name, ERR_PTR(ret));
+	xe_uc_fw_change_status(&huc->fw, XE_UC_FIRMWARE_LOAD_FAIL);
+
+	return ret;
+}
+
+void xe_huc_sanitize(struct xe_huc *huc)
+{
+	xe_uc_fw_sanitize(&huc->fw);
+}
+
+void xe_huc_print_info(struct xe_huc *huc, struct drm_printer *p)
+{
+	struct xe_gt *gt = huc_to_gt(huc);
+	unsigned int fw_ref;
+
+	xe_uc_fw_print(&huc->fw, p);
+
+	if (!xe_uc_fw_is_enabled(&huc->fw))
+		return;
+
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	if (!fw_ref)
+		return;
+
+	drm_printf(p, "\nHuC status: 0x%08x\n",
+		   xe_mmio_read32(&gt->mmio, HUC_KERNEL_LOAD_INFO));
+
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
+}