0b23e2a6ed
Better explain the usage of the microcontroller and what i915 is
responsible of. While at it, fix the documentation for the auth
function, which doesn't do any pinning anymore.
v2: add a comment on HuC being optional and descrive how HuC accesses
memory (Martin)
v3: add extra newline for better text organization (Martin)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Martin Peres <martin.peres@linux.intel.com>
Acked-by: Anna Karas <anna.karas@intel.com>
Reviewed-by: Martin Peres <martin.peres@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191014183602.3643-3-daniele.ceraolospurio@intel.com
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2014-2019 Intel Corporation
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*/
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#include "gt/intel_gt.h"
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#include "intel_huc_fw.h"
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#include "i915_drv.h"
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/**
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* intel_huc_fw_init_early() - initializes HuC firmware struct
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* @huc: intel_huc struct
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*
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* On platforms with HuC selects firmware for uploading
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*/
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void intel_huc_fw_init_early(struct intel_huc *huc)
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{
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struct intel_gt *gt = huc_to_gt(huc);
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struct intel_uc *uc = >->uc;
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struct drm_i915_private *i915 = gt->i915;
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intel_uc_fw_init_early(&huc->fw, INTEL_UC_FW_TYPE_HUC,
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intel_uc_uses_guc(uc),
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INTEL_INFO(i915)->platform, INTEL_REVID(i915));
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}
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/**
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* intel_huc_fw_upload() - load HuC uCode to device
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* @huc: intel_huc structure
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*
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* Called from intel_uc_init_hw() during driver load, resume from sleep and
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* after a GPU reset. Note that HuC must be loaded before GuC.
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*
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* The firmware image should have already been fetched into memory, so only
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* check that fetch succeeded, and then transfer the image to the h/w.
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*
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* Return: non-zero code on error
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*/
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int intel_huc_fw_upload(struct intel_huc *huc)
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{
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/* HW doesn't look at destination address for HuC, so set it to 0 */
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return intel_uc_fw_upload(&huc->fw, huc_to_gt(huc), 0, HUC_UKERNEL);
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}
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