mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
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8a9bf29546
The GSC uC needs to communicate with the CSME to perform certain
operations. Since the GSC can't perform this communication directly
on platforms where it is integrated in GT, i915 needs to transfer the
messages from GSC to CSME and back.
The proxy flow is as follow:
1 - i915 submits a request to GSC asking for the message to CSME
2 - GSC replies with the proxy header + payload for CSME
3 - i915 sends the reply from GSC as-is to CSME via the mei proxy
component
4 - CSME replies with the proxy header + payload for GSC
5 - i915 submits a request to GSC with the reply from CSME
6 - GSC replies either with a new header + payload (same as step 2,
so we restart from there) or with an end message.
After GSC load, i915 is expected to start the first proxy message chain,
while all subsequent ones will be triggered by the GSC via interrupt.
To communicate with the CSME, we use a dedicated mei component, which
means that we need to wait for it to bind before we can initialize the
proxies. This usually happens quite fast, but given that there is a
chance that we'll have to wait a few seconds the GSC work has been moved
to a dedicated WQ to not stall other processes.
v2: fix code style, includes and variable naming (Alan)
v3: add extra check for proxy status, fix includes and comments
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230502163854.317653-4-daniele.ceraolospurio@intel.com
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2022 Intel Corporation
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*/
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#ifndef _INTEL_GSC_UC_H_
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#define _INTEL_GSC_UC_H_
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#include "intel_uc_fw.h"
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struct i915_vma;
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struct intel_context;
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struct i915_gsc_proxy_component;
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struct intel_gsc_uc {
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/* Generic uC firmware management */
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struct intel_uc_fw fw;
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/* GSC-specific additions */
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struct i915_vma *local; /* private memory for GSC usage */
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struct intel_context *ce; /* for submission to GSC FW via GSC engine */
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/* for delayed load and proxy handling */
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struct workqueue_struct *wq;
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struct work_struct work;
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struct {
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struct i915_gsc_proxy_component *component;
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bool component_added;
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struct i915_vma *vma;
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void *to_gsc;
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void *to_csme;
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struct mutex mutex; /* protects the tee channel binding */
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} proxy;
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};
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void intel_gsc_uc_init_early(struct intel_gsc_uc *gsc);
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int intel_gsc_uc_init(struct intel_gsc_uc *gsc);
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void intel_gsc_uc_fini(struct intel_gsc_uc *gsc);
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void intel_gsc_uc_suspend(struct intel_gsc_uc *gsc);
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void intel_gsc_uc_resume(struct intel_gsc_uc *gsc);
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void intel_gsc_uc_flush_work(struct intel_gsc_uc *gsc);
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void intel_gsc_uc_load_start(struct intel_gsc_uc *gsc);
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static inline bool intel_gsc_uc_is_supported(struct intel_gsc_uc *gsc)
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{
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return intel_uc_fw_is_supported(&gsc->fw);
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}
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static inline bool intel_gsc_uc_is_wanted(struct intel_gsc_uc *gsc)
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{
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return intel_uc_fw_is_enabled(&gsc->fw);
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}
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static inline bool intel_gsc_uc_is_used(struct intel_gsc_uc *gsc)
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{
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GEM_BUG_ON(__intel_uc_fw_status(&gsc->fw) == INTEL_UC_FIRMWARE_SELECTED);
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return intel_uc_fw_is_available(&gsc->fw);
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}
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#endif
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