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In debugging platform or firmware related MEI-PXP connection issues, having a timeout when clients (such as i915) calling into mei-pxp's send/receive functions have proven useful as opposed to blocking forever until the kernel triggers a watchdog panic (when platform issues are experienced). Update the mei-pxp component interface send and receive functions to take in timeouts. Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Link: https://lore.kernel.org/r/20231011110157.247552-5-tomas.winkler@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2020 Intel Corporation
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*/
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#ifndef _I915_PXP_TEE_INTERFACE_H_
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#define _I915_PXP_TEE_INTERFACE_H_
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#include <linux/mutex.h>
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#include <linux/device.h>
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struct scatterlist;
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/**
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* struct i915_pxp_component_ops - ops for PXP services.
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* @owner: Module providing the ops
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* @send: sends data to PXP
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* @receive: receives data from PXP
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*/
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struct i915_pxp_component_ops {
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/**
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* @owner: owner of the module provding the ops
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*/
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struct module *owner;
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int (*send)(struct device *dev, const void *message, size_t size,
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unsigned long timeout_ms);
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int (*recv)(struct device *dev, void *buffer, size_t size,
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unsigned long timeout_ms);
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ssize_t (*gsc_command)(struct device *dev, u8 client_id, u32 fence_id,
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struct scatterlist *sg_in, size_t total_in_len,
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struct scatterlist *sg_out);
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};
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/**
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* struct i915_pxp_component - Used for communication between i915 and TEE
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* drivers for the PXP services
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* @tee_dev: device that provide the PXP service from TEE Bus.
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* @pxp_ops: Ops implemented by TEE driver, used by i915 driver.
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*/
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struct i915_pxp_component {
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struct device *tee_dev;
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const struct i915_pxp_component_ops *ops;
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/* To protect the above members. */
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struct mutex mutex;
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};
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#endif /* _I915_TEE_PXP_INTERFACE_H_ */
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