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0ba2035026
The system will have lost power during S4. The ring used for TEE
communications needs to be initialized before use.
Fixes: f892a21f51 ("crypto: ccp - use generic power management")
Reported-by: Lars Francke <lars.francke@gmail.com>
Closes: https://lore.kernel.org/platform-driver-x86/CAD-Ua_gfJnQSo8ucS_7ZwzuhoBRJ14zXP7s8b-zX3ZcxcyWePw@mail.gmail.com/
Tested-by: Yijun Shen <Yijun.Shen@Dell.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://patch.msgid.link/20260116041132.153674-4-superm1@kernel.org
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright (C) 2019,2021 Advanced Micro Devices, Inc.
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*
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* Author: Rijo Thomas <Rijo-john.Thomas@amd.com>
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* Author: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
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*
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*/
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/* This file describes the TEE communication interface between host and AMD
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* Secure Processor
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*/
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#ifndef __TEE_DEV_H__
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#define __TEE_DEV_H__
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#include <linux/device.h>
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#include <linux/mutex.h>
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#define TEE_DEFAULT_CMD_TIMEOUT (10 * MSEC_PER_SEC)
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#define TEE_DEFAULT_RING_TIMEOUT 10
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#define MAX_BUFFER_SIZE 988
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/**
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* struct tee_init_ring_cmd - Command to init TEE ring buffer
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* @low_addr: bits [31:0] of the physical address of ring buffer
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* @hi_addr: bits [63:32] of the physical address of ring buffer
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* @size: size of ring buffer in bytes
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*/
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struct tee_init_ring_cmd {
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u32 low_addr;
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u32 hi_addr;
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u32 size;
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};
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#define MAX_RING_BUFFER_ENTRIES 32
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/**
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* struct ring_buf_manager - Helper structure to manage ring buffer.
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* @ring_start: starting address of ring buffer
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* @ring_size: size of ring buffer in bytes
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* @ring_pa: physical address of ring buffer
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* @wptr: index to the last written entry in ring buffer
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*/
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struct ring_buf_manager {
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struct mutex mutex; /* synchronizes access to ring buffer */
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void *ring_start;
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u32 ring_size;
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phys_addr_t ring_pa;
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u32 wptr;
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};
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struct psp_tee_device {
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struct device *dev;
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struct psp_device *psp;
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void __iomem *io_regs;
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struct tee_vdata *vdata;
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struct ring_buf_manager rb_mgr;
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};
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/**
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* enum tee_cmd_state - TEE command states for the ring buffer interface
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* @TEE_CMD_STATE_INIT: initial state of command when sent from host
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* @TEE_CMD_STATE_PROCESS: command being processed by TEE environment
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* @TEE_CMD_STATE_COMPLETED: command processing completed
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*/
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enum tee_cmd_state {
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TEE_CMD_STATE_INIT,
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TEE_CMD_STATE_PROCESS,
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TEE_CMD_STATE_COMPLETED,
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};
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/**
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* enum cmd_resp_state - TEE command's response status maintained by driver
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* @CMD_RESPONSE_INVALID: initial state when no command is written to ring
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* @CMD_WAITING_FOR_RESPONSE: driver waiting for response from TEE
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* @CMD_RESPONSE_TIMEDOUT: failed to get response from TEE
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* @CMD_RESPONSE_COPIED: driver has copied response from TEE
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*/
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enum cmd_resp_state {
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CMD_RESPONSE_INVALID,
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CMD_WAITING_FOR_RESPONSE,
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CMD_RESPONSE_TIMEDOUT,
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CMD_RESPONSE_COPIED,
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};
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/**
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* struct tee_ring_cmd - Structure of the command buffer in TEE ring
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* @cmd_id: refers to &enum tee_cmd_id. Command id for the ring buffer
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* interface
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* @cmd_state: refers to &enum tee_cmd_state
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* @status: status of TEE command execution
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* @res0: reserved region
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* @pdata: private data (currently unused)
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* @res1: reserved region
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* @buf: TEE command specific buffer
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* @flag: refers to &enum cmd_resp_state
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*/
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struct tee_ring_cmd {
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u32 cmd_id;
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u32 cmd_state;
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u32 status;
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u32 res0[1];
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u64 pdata;
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u32 res1[2];
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u8 buf[MAX_BUFFER_SIZE];
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u32 flag;
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/* Total size: 1024 bytes */
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} __packed;
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int tee_dev_init(struct psp_device *psp);
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void tee_dev_destroy(struct psp_device *psp);
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int tee_restore(struct psp_device *psp);
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#endif /* __TEE_DEV_H__ */
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