diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_huc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_huc.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_huc.c b/drivers/gpu/drm/i915/intel_huc.c new file mode 100644 index 000000000..ffcad5fad --- /dev/null +++ b/drivers/gpu/drm/i915/intel_huc.c @@ -0,0 +1,127 @@ +/* + * Copyright © 2016-2017 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + */ + +#include <linux/types.h> + +#include "intel_huc.h" +#include "i915_drv.h" + +void intel_huc_init_early(struct intel_huc *huc) +{ + intel_huc_fw_init_early(huc); +} + +int intel_huc_init_misc(struct intel_huc *huc) +{ + struct drm_i915_private *i915 = huc_to_i915(huc); + + intel_uc_fw_fetch(i915, &huc->fw); + return 0; +} + +/** + * intel_huc_auth() - Authenticate HuC uCode + * @huc: intel_huc structure + * + * Called after HuC and GuC firmware loading during intel_uc_init_hw(). + * + * This function pins HuC firmware image object into GGTT. + * Then it invokes GuC action to authenticate passing the offset to RSA + * signature through intel_guc_auth_huc(). It then waits for 50ms for + * firmware verification ACK and unpins the object. + */ +int intel_huc_auth(struct intel_huc *huc) +{ + struct drm_i915_private *i915 = huc_to_i915(huc); + struct intel_guc *guc = &i915->guc; + struct i915_vma *vma; + u32 status; + int ret; + + if (huc->fw.load_status != INTEL_UC_FIRMWARE_SUCCESS) + return -ENOEXEC; + + vma = i915_gem_object_ggtt_pin(huc->fw.obj, NULL, 0, 0, + PIN_OFFSET_BIAS | guc->ggtt_pin_bias); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + DRM_ERROR("HuC: Failed to pin huc fw object %d\n", ret); + goto fail; + } + + ret = intel_guc_auth_huc(guc, + intel_guc_ggtt_offset(guc, vma) + + huc->fw.rsa_offset); + if (ret) { + DRM_ERROR("HuC: GuC did not ack Auth request %d\n", ret); + goto fail_unpin; + } + + /* Check authentication status, it should be done by now */ + ret = __intel_wait_for_register(i915, + HUC_STATUS2, + HUC_FW_VERIFIED, + HUC_FW_VERIFIED, + 2, 50, &status); + if (ret) { + DRM_ERROR("HuC: Firmware not verified %#x\n", status); + goto fail_unpin; + } + + i915_vma_unpin(vma); + return 0; + +fail_unpin: + i915_vma_unpin(vma); +fail: + huc->fw.load_status = INTEL_UC_FIRMWARE_FAIL; + + DRM_ERROR("HuC: Authentication failed %d\n", ret); + 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 positive value if HuC firmware is loaded and verified + * and -ENODEV if HuC is not present. + */ +int intel_huc_check_status(struct intel_huc *huc) +{ + struct drm_i915_private *dev_priv = huc_to_i915(huc); + u32 status; + + if (!HAS_HUC(dev_priv)) + return -ENODEV; + + intel_runtime_pm_get(dev_priv); + status = I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED; + intel_runtime_pm_put(dev_priv); + + return status; +} |