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// SPDX-License-Identifier: MIT
/*
* Copyright © 2016-2019 Intel Corporation
*/
#include <linux/types.h>
#include "gt/intel_gt.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. 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.
*
* 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;
}
}
int intel_huc_init(struct intel_huc *huc)
{
struct drm_i915_private *i915 = huc_to_gt(huc)->i915;
int err;
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:
i915_probe_error(i915, "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 = >->uc.guc;
int ret;
GEM_BUG_ON(intel_huc_is_authenticated(huc));
if (!intel_uc_fw_is_loaded(&huc->fw))
return -ENOEXEC;
ret = i915_inject_probe_error(gt->i915, -ENXIO);
if (ret)
goto fail;
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);
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;
}
/**
* 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)
{
struct intel_gt *gt = huc_to_gt(huc);
intel_wakeref_t wakeref;
u32 status = 0;
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;
}
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_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));
}
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