// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
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* Intel Management Engine Interface (Intel MEI) Linux driver
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*/
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#include <linux/export.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hbm.h"
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#include "client.h"
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static const char *mei_hbm_status_str(enum mei_hbm_status status)
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{
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#define MEI_HBM_STATUS(status) case MEI_HBMS_##status: return #status
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switch (status) {
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MEI_HBM_STATUS(SUCCESS);
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MEI_HBM_STATUS(CLIENT_NOT_FOUND);
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MEI_HBM_STATUS(ALREADY_EXISTS);
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MEI_HBM_STATUS(REJECTED);
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MEI_HBM_STATUS(INVALID_PARAMETER);
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MEI_HBM_STATUS(NOT_ALLOWED);
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MEI_HBM_STATUS(ALREADY_STARTED);
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MEI_HBM_STATUS(NOT_STARTED);
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default: return "unknown";
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}
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#undef MEI_HBM_STATUS
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};
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static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
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{
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#define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
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switch (status) {
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MEI_CL_CS(SUCCESS);
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MEI_CL_CS(NOT_FOUND);
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MEI_CL_CS(ALREADY_STARTED);
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MEI_CL_CS(OUT_OF_RESOURCES);
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MEI_CL_CS(MESSAGE_SMALL);
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MEI_CL_CS(NOT_ALLOWED);
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default: return "unknown";
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}
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#undef MEI_CL_CCS
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}
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const char *mei_hbm_state_str(enum mei_hbm_state state)
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{
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#define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
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switch (state) {
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MEI_HBM_STATE(IDLE);
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MEI_HBM_STATE(STARTING);
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MEI_HBM_STATE(STARTED);
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MEI_HBM_STATE(DR_SETUP);
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MEI_HBM_STATE(ENUM_CLIENTS);
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MEI_HBM_STATE(CLIENT_PROPERTIES);
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MEI_HBM_STATE(STOPPED);
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default:
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return "unknown";
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}
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#undef MEI_HBM_STATE
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}
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/**
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* mei_cl_conn_status_to_errno - convert client connect response
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* status to error code
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*
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* @status: client connect response status
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*
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* Return: corresponding error code
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*/
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static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
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{
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switch (status) {
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case MEI_CL_CONN_SUCCESS: return 0;
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case MEI_CL_CONN_NOT_FOUND: return -ENOTTY;
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case MEI_CL_CONN_ALREADY_STARTED: return -EBUSY;
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case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
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case MEI_CL_CONN_MESSAGE_SMALL: return -EINVAL;
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case MEI_CL_CONN_NOT_ALLOWED: return -EBUSY;
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default: return -EINVAL;
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}
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}
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/**
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* mei_hbm_write_message - wrapper for sending hbm messages.
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*
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* @dev: mei device
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* @hdr: mei header
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* @data: payload
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*/
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static inline int mei_hbm_write_message(struct mei_device *dev,
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struct mei_msg_hdr *hdr,
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const void *data)
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{
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return mei_write_message(dev, hdr, sizeof(*hdr), data, hdr->length);
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}
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/**
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* mei_hbm_idle - set hbm to idle state
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*
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* @dev: the device structure
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*/
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void mei_hbm_idle(struct mei_device *dev)
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{
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dev->init_clients_timer = 0;
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dev->hbm_state = MEI_HBM_IDLE;
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}
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/**
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* mei_hbm_reset - reset hbm counters and book keeping data structurs
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*
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* @dev: the device structure
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*/
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void mei_hbm_reset(struct mei_device *dev)
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{
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mei_me_cl_rm_all(dev);
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mei_hbm_idle(dev);
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}
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/**
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* mei_hbm_hdr - construct hbm header
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*
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* @mei_hdr: hbm header
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* @length: payload length
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*/
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static inline void mei_hbm_hdr(struct mei_msg_hdr *mei_hdr, size_t length)
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{
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memset(mei_hdr, 0, sizeof(*mei_hdr));
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mei_hdr->length = length;
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mei_hdr->msg_complete = 1;
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}
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/**
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* mei_hbm_cl_hdr - construct client hbm header
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*
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* @cl: client
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* @hbm_cmd: host bus message command
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* @buf: buffer for cl header
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* @len: buffer length
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*/
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static inline
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void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
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{
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struct mei_hbm_cl_cmd *cmd = buf;
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memset(cmd, 0, len);
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cmd->hbm_cmd = hbm_cmd;
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cmd->host_addr = mei_cl_host_addr(cl);
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cmd->me_addr = mei_cl_me_id(cl);
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}
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/**
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* mei_hbm_cl_write - write simple hbm client message
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*
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* @dev: the device structure
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* @cl: client
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* @hbm_cmd: host bus message command
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* @buf: message buffer
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* @len: buffer length
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*
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* Return: 0 on success, <0 on failure.
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*/
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static inline int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
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u8 hbm_cmd, void *buf, size_t len)
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{
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struct mei_msg_hdr mei_hdr;
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mei_hbm_hdr(&mei_hdr, len);
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mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
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return mei_hbm_write_message(dev, &mei_hdr, buf);
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}
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/**
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* mei_hbm_cl_addr_equal - check if the client's and
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* the message address match
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*
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* @cl: client
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* @cmd: hbm client message
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*
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* Return: true if addresses are the same
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*/
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static inline
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bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
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{
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return mei_cl_host_addr(cl) == cmd->host_addr &&
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mei_cl_me_id(cl) == cmd->me_addr;
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}
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/**
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* mei_hbm_cl_find_by_cmd - find recipient client
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*
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* @dev: the device structure
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* @buf: a buffer with hbm cl command
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*
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* Return: the recipient client or NULL if not found
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*/
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static inline
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struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
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{
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struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
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struct mei_cl *cl;
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list_for_each_entry(cl, &dev->file_list, link)
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if (mei_hbm_cl_addr_equal(cl, cmd))
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return cl;
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return NULL;
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}
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/**
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* mei_hbm_start_wait - wait for start response message.
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*
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* @dev: the device structure
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*
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* Return: 0 on success and < 0 on failure
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*/
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int mei_hbm_start_wait(struct mei_device *dev)
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{
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int ret;
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if (dev->hbm_state > MEI_HBM_STARTING)
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return 0;
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mutex_unlock(&dev->device_lock);
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ret = wait_event_timeout(dev->wait_hbm_start,
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dev->hbm_state != MEI_HBM_STARTING,
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mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
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mutex_lock(&dev->device_lock);
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if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
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dev->hbm_state = MEI_HBM_IDLE;
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dev_err(dev->dev, "waiting for mei start failed\n");
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return -ETIME;
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}
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return 0;
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}
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/**
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* mei_hbm_start_req - sends start request message.
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*
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* @dev: the device structure
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*
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* Return: 0 on success and < 0 on failure
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*/
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int mei_hbm_start_req(struct mei_device *dev)
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{
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struct mei_msg_hdr mei_hdr;
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struct hbm_host_version_request req;
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int ret;
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mei_hbm_reset(dev);
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mei_hbm_hdr(&mei_hdr, sizeof(req));
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/* host start message */
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memset(&req, 0, sizeof(req));
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req.hbm_cmd = HOST_START_REQ_CMD;
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req.host_version.major_version = HBM_MAJOR_VERSION;
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req.host_version.minor_version = HBM_MINOR_VERSION;
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dev->hbm_state = MEI_HBM_IDLE;
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ret = mei_hbm_write_message(dev, &mei_hdr, &req);
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if (ret) {
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dev_err(dev->dev, "version message write failed: ret = %d\n",
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ret);
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return ret;
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}
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dev->hbm_state = MEI_HBM_STARTING;
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dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
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mei_schedule_stall_timer(dev);
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return 0;
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}
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/**
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* mei_hbm_dma_setup_req() - setup DMA request
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* @dev: the device structure
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*
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* Return: 0 on success and < 0 on failure
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*/
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static int mei_hbm_dma_setup_req(struct mei_device *dev)
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{
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struct mei_msg_hdr mei_hdr;
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struct hbm_dma_setup_request req;
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unsigned int i;
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int ret;
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mei_hbm_hdr(&mei_hdr, sizeof(req));
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memset(&req, 0, sizeof(req));
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req.hbm_cmd = MEI_HBM_DMA_SETUP_REQ_CMD;
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for (i = 0; i < DMA_DSCR_NUM; i++) {
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phys_addr_t paddr;
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paddr = dev->dr_dscr[i].daddr;
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req.dma_dscr[i].addr_hi = upper_32_bits(paddr);
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req.dma_dscr[i].addr_lo = lower_32_bits(paddr);
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req.dma_dscr[i].size = dev->dr_dscr[i].size;
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}
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mei_dma_ring_reset(dev);
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ret = mei_hbm_write_message(dev, &mei_hdr, &req);
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if (ret) {
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dev_err(dev->dev, "dma setup request write failed: ret = %d.\n",
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ret);
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return ret;
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}
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dev->hbm_state = MEI_HBM_DR_SETUP;
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dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
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mei_schedule_stall_timer(dev);
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return 0;
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}
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/**
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* mei_hbm_capabilities_req - request capabilities
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*
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* @dev: the device structure
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*
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* Return: 0 on success and < 0 on failure
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*/
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static int mei_hbm_capabilities_req(struct mei_device *dev)
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{
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struct mei_msg_hdr mei_hdr;
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struct hbm_capability_request req;
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int ret;
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mei_hbm_hdr(&mei_hdr, sizeof(req));
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memset(&req, 0, sizeof(req));
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req.hbm_cmd = MEI_HBM_CAPABILITIES_REQ_CMD;
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if (dev->hbm_f_vt_supported)
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req.capability_requested[0] = HBM_CAP_VT;
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ret = mei_hbm_write_message(dev, &mei_hdr, &req);
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if (ret) {
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dev_err(dev->dev,
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"capabilities request write failed: ret = %d.\n", ret);
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return ret;
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}
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dev->hbm_state = MEI_HBM_CAP_SETUP;
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dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
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mei_schedule_stall_timer(dev);
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return 0;
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}
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/**
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* mei_hbm_enum_clients_req - sends enumeration client request message.
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*
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* @dev: the device structure
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*
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* Return: 0 on success and < 0 on failure
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*/
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static int mei_hbm_enum_clients_req(struct mei_device *dev)
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{
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struct mei_msg_hdr mei_hdr;
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struct hbm_host_enum_request req;
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int ret;
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/* enumerate clients */
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mei_hbm_hdr(&mei_hdr, sizeof(req));
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memset(&req, 0, sizeof(req));
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req.hbm_cmd = HOST_ENUM_REQ_CMD;
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req.flags |= dev->hbm_f_dc_supported ? MEI_HBM_ENUM_F_ALLOW_ADD : 0;
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req.flags |= dev->hbm_f_ie_supported ?
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MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
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ret = mei_hbm_write_message(dev, &mei_hdr, &req);
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if (ret) {
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dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
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ret);
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return ret;
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}
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dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
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dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
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mei_schedule_stall_timer(dev);
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return 0;
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}
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/**
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* mei_hbm_me_cl_add - add new me client to the list
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*
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* @dev: the device structure
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* @res: hbm property response
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*
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* Return: 0 on success and -ENOMEM on allocation failure
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*/
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static int mei_hbm_me_cl_add(struct mei_device *dev,
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struct hbm_props_response *res)
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{
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struct mei_me_client *me_cl;
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const uuid_le *uuid = &res->client_properties.protocol_name;
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mei_me_cl_rm_by_uuid(dev, uuid);
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me_cl = kzalloc(sizeof(*me_cl), GFP_KERNEL);
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if (!me_cl)
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return -ENOMEM;
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mei_me_cl_init(me_cl);
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me_cl->props = res->client_properties;
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me_cl->client_id = res->me_addr;
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me_cl->tx_flow_ctrl_creds = 0;
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mei_me_cl_add(dev, me_cl);
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return 0;
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}
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/**
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* mei_hbm_add_cl_resp - send response to fw on client add request
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*
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* @dev: the device structure
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* @addr: me address
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* @status: response status
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*
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* Return: 0 on success and < 0 on failure
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*/
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static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
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{
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struct mei_msg_hdr mei_hdr;
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struct hbm_add_client_response resp;
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int ret;
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dev_dbg(dev->dev, "adding client response\n");
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mei_hbm_hdr(&mei_hdr, sizeof(resp));
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memset(&resp, 0, sizeof(resp));
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resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
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resp.me_addr = addr;
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resp.status = status;
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ret = mei_hbm_write_message(dev, &mei_hdr, &resp);
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if (ret)
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dev_err(dev->dev, "add client response write failed: ret = %d\n",
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ret);
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return ret;
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}
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/**
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* mei_hbm_fw_add_cl_req - request from the fw to add a client
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*
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* @dev: the device structure
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* @req: add client request
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*
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* Return: 0 on success and < 0 on failure
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*/
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static int mei_hbm_fw_add_cl_req(struct mei_device *dev,
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struct hbm_add_client_request *req)
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{
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int ret;
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u8 status = MEI_HBMS_SUCCESS;
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BUILD_BUG_ON(sizeof(struct hbm_add_client_request) !=
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sizeof(struct hbm_props_response));
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ret = mei_hbm_me_cl_add(dev, (struct hbm_props_response *)req);
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if (ret)
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status = !MEI_HBMS_SUCCESS;
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if (dev->dev_state == MEI_DEV_ENABLED)
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schedule_work(&dev->bus_rescan_work);
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return mei_hbm_add_cl_resp(dev, req->me_addr, status);
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}
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/**
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* mei_hbm_cl_notify_req - send notification request
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*
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* @dev: the device structure
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* @cl: a client to disconnect from
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* @start: true for start false for stop
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*
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* Return: 0 on success and -EIO on write failure
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*/
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int mei_hbm_cl_notify_req(struct mei_device *dev,
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struct mei_cl *cl, u8 start)
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{
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struct mei_msg_hdr mei_hdr;
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struct hbm_notification_request req;
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int ret;
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mei_hbm_hdr(&mei_hdr, sizeof(req));
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mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, sizeof(req));
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req.start = start;
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ret = mei_hbm_write_message(dev, &mei_hdr, &req);
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if (ret)
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dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
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return ret;
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}
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/**
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* notify_res_to_fop - convert notification response to the proper
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* notification FOP
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*
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* @cmd: client notification start response command
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*
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* Return: MEI_FOP_NOTIFY_START or MEI_FOP_NOTIFY_STOP;
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*/
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static inline enum mei_cb_file_ops notify_res_to_fop(struct mei_hbm_cl_cmd *cmd)
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{
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struct hbm_notification_response *rs =
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(struct hbm_notification_response *)cmd;
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return mei_cl_notify_req2fop(rs->start);
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}
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/**
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* mei_hbm_cl_notify_start_res - update the client state according
|
* notify start response
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*
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* @dev: the device structure
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* @cl: mei host client
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* @cmd: client notification start response command
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*/
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static void mei_hbm_cl_notify_start_res(struct mei_device *dev,
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struct mei_cl *cl,
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struct mei_hbm_cl_cmd *cmd)
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{
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struct hbm_notification_response *rs =
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(struct hbm_notification_response *)cmd;
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cl_dbg(dev, cl, "hbm: notify start response status=%d\n", rs->status);
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if (rs->status == MEI_HBMS_SUCCESS ||
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rs->status == MEI_HBMS_ALREADY_STARTED) {
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cl->notify_en = true;
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cl->status = 0;
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} else {
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cl->status = -EINVAL;
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}
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}
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/**
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* mei_hbm_cl_notify_stop_res - update the client state according
|
* notify stop response
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*
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* @dev: the device structure
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* @cl: mei host client
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* @cmd: client notification stop response command
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*/
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static void mei_hbm_cl_notify_stop_res(struct mei_device *dev,
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struct mei_cl *cl,
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struct mei_hbm_cl_cmd *cmd)
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{
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struct hbm_notification_response *rs =
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(struct hbm_notification_response *)cmd;
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cl_dbg(dev, cl, "hbm: notify stop response status=%d\n", rs->status);
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if (rs->status == MEI_HBMS_SUCCESS ||
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rs->status == MEI_HBMS_NOT_STARTED) {
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cl->notify_en = false;
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cl->status = 0;
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} else {
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/* TODO: spec is not clear yet about other possible issues */
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cl->status = -EINVAL;
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}
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}
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/**
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* mei_hbm_cl_notify - signal notification event
|
*
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* @dev: the device structure
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* @cmd: notification client message
|
*/
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static void mei_hbm_cl_notify(struct mei_device *dev,
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struct mei_hbm_cl_cmd *cmd)
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{
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struct mei_cl *cl;
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cl = mei_hbm_cl_find_by_cmd(dev, cmd);
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if (cl)
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mei_cl_notify(cl);
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}
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|
/**
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* mei_hbm_prop_req - request property for a single client
|
*
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* @dev: the device structure
|
* @start_idx: client index to start search
|
*
|
* Return: 0 on success and < 0 on failure
|
*/
|
static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
|
{
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struct mei_msg_hdr mei_hdr;
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struct hbm_props_request req;
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unsigned long addr;
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int ret;
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addr = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, start_idx);
|
|
/* We got all client properties */
|
if (addr == MEI_CLIENTS_MAX) {
|
dev->hbm_state = MEI_HBM_STARTED;
|
mei_host_client_init(dev);
|
return 0;
|
}
|
|
mei_hbm_hdr(&mei_hdr, sizeof(req));
|
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memset(&req, 0, sizeof(req));
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req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
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req.me_addr = addr;
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ret = mei_hbm_write_message(dev, &mei_hdr, &req);
|
if (ret) {
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dev_err(dev->dev, "properties request write failed: ret = %d\n",
|
ret);
|
return ret;
|
}
|
|
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
|
mei_schedule_stall_timer(dev);
|
|
return 0;
|
}
|
|
/**
|
* mei_hbm_pg - sends pg command
|
*
|
* @dev: the device structure
|
* @pg_cmd: the pg command code
|
*
|
* Return: -EIO on write failure
|
* -EOPNOTSUPP if the operation is not supported by the protocol
|
*/
|
int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
|
{
|
struct mei_msg_hdr mei_hdr;
|
struct hbm_power_gate req;
|
int ret;
|
|
if (!dev->hbm_f_pg_supported)
|
return -EOPNOTSUPP;
|
|
mei_hbm_hdr(&mei_hdr, sizeof(req));
|
|
memset(&req, 0, sizeof(req));
|
req.hbm_cmd = pg_cmd;
|
|
ret = mei_hbm_write_message(dev, &mei_hdr, &req);
|
if (ret)
|
dev_err(dev->dev, "power gate command write failed.\n");
|
return ret;
|
}
|
EXPORT_SYMBOL_GPL(mei_hbm_pg);
|
|
/**
|
* mei_hbm_stop_req - send stop request message
|
*
|
* @dev: mei device
|
*
|
* Return: -EIO on write failure
|
*/
|
static int mei_hbm_stop_req(struct mei_device *dev)
|
{
|
struct mei_msg_hdr mei_hdr;
|
struct hbm_host_stop_request req;
|
|
mei_hbm_hdr(&mei_hdr, sizeof(req));
|
|
memset(&req, 0, sizeof(req));
|
req.hbm_cmd = HOST_STOP_REQ_CMD;
|
req.reason = DRIVER_STOP_REQUEST;
|
|
return mei_hbm_write_message(dev, &mei_hdr, &req);
|
}
|
|
/**
|
* mei_hbm_cl_flow_control_req - sends flow control request.
|
*
|
* @dev: the device structure
|
* @cl: client info
|
*
|
* Return: -EIO on write failure
|
*/
|
int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
|
{
|
struct hbm_flow_control req;
|
|
cl_dbg(dev, cl, "sending flow control\n");
|
return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD,
|
&req, sizeof(req));
|
}
|
|
/**
|
* mei_hbm_add_single_tx_flow_ctrl_creds - adds single buffer credentials.
|
*
|
* @dev: the device structure
|
* @fctrl: flow control response bus message
|
*
|
* Return: 0 on success, < 0 otherwise
|
*/
|
static int mei_hbm_add_single_tx_flow_ctrl_creds(struct mei_device *dev,
|
struct hbm_flow_control *fctrl)
|
{
|
struct mei_me_client *me_cl;
|
int rets;
|
|
me_cl = mei_me_cl_by_id(dev, fctrl->me_addr);
|
if (!me_cl) {
|
dev_err(dev->dev, "no such me client %d\n", fctrl->me_addr);
|
return -ENOENT;
|
}
|
|
if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
|
rets = -EINVAL;
|
goto out;
|
}
|
|
me_cl->tx_flow_ctrl_creds++;
|
dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
|
fctrl->me_addr, me_cl->tx_flow_ctrl_creds);
|
|
rets = 0;
|
out:
|
mei_me_cl_put(me_cl);
|
return rets;
|
}
|
|
/**
|
* mei_hbm_cl_flow_control_res - flow control response from me
|
*
|
* @dev: the device structure
|
* @fctrl: flow control response bus message
|
*/
|
static void mei_hbm_cl_tx_flow_ctrl_creds_res(struct mei_device *dev,
|
struct hbm_flow_control *fctrl)
|
{
|
struct mei_cl *cl;
|
|
if (!fctrl->host_addr) {
|
/* single receive buffer */
|
mei_hbm_add_single_tx_flow_ctrl_creds(dev, fctrl);
|
return;
|
}
|
|
cl = mei_hbm_cl_find_by_cmd(dev, fctrl);
|
if (cl) {
|
cl->tx_flow_ctrl_creds++;
|
cl_dbg(dev, cl, "flow control creds = %d.\n",
|
cl->tx_flow_ctrl_creds);
|
}
|
}
|
|
|
/**
|
* mei_hbm_cl_disconnect_req - sends disconnect message to fw.
|
*
|
* @dev: the device structure
|
* @cl: a client to disconnect from
|
*
|
* Return: -EIO on write failure
|
*/
|
int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
|
{
|
struct hbm_client_connect_request req;
|
|
return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD,
|
&req, sizeof(req));
|
}
|
|
/**
|
* mei_hbm_cl_disconnect_rsp - sends disconnect respose to the FW
|
*
|
* @dev: the device structure
|
* @cl: a client to disconnect from
|
*
|
* Return: -EIO on write failure
|
*/
|
int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
|
{
|
struct hbm_client_connect_response resp;
|
|
return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD,
|
&resp, sizeof(resp));
|
}
|
|
/**
|
* mei_hbm_cl_disconnect_res - update the client state according
|
* disconnect response
|
*
|
* @dev: the device structure
|
* @cl: mei host client
|
* @cmd: disconnect client response host bus message
|
*/
|
static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
|
struct mei_hbm_cl_cmd *cmd)
|
{
|
struct hbm_client_connect_response *rs =
|
(struct hbm_client_connect_response *)cmd;
|
|
cl_dbg(dev, cl, "hbm: disconnect response status=%d\n", rs->status);
|
|
if (rs->status == MEI_CL_DISCONN_SUCCESS)
|
cl->state = MEI_FILE_DISCONNECT_REPLY;
|
cl->status = 0;
|
}
|
|
/**
|
* mei_hbm_cl_connect_req - send connection request to specific me client
|
*
|
* @dev: the device structure
|
* @cl: a client to connect to
|
*
|
* Return: -EIO on write failure
|
*/
|
int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
|
{
|
struct hbm_client_connect_request req;
|
|
return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD,
|
&req, sizeof(req));
|
}
|
|
/**
|
* mei_hbm_cl_connect_res - update the client state according
|
* connection response
|
*
|
* @dev: the device structure
|
* @cl: mei host client
|
* @cmd: connect client response host bus message
|
*/
|
static void mei_hbm_cl_connect_res(struct mei_device *dev, struct mei_cl *cl,
|
struct mei_hbm_cl_cmd *cmd)
|
{
|
struct hbm_client_connect_response *rs =
|
(struct hbm_client_connect_response *)cmd;
|
|
cl_dbg(dev, cl, "hbm: connect response status=%s\n",
|
mei_cl_conn_status_str(rs->status));
|
|
if (rs->status == MEI_CL_CONN_SUCCESS)
|
cl->state = MEI_FILE_CONNECTED;
|
else {
|
cl->state = MEI_FILE_DISCONNECT_REPLY;
|
if (rs->status == MEI_CL_CONN_NOT_FOUND) {
|
mei_me_cl_del(dev, cl->me_cl);
|
if (dev->dev_state == MEI_DEV_ENABLED)
|
schedule_work(&dev->bus_rescan_work);
|
}
|
}
|
cl->status = mei_cl_conn_status_to_errno(rs->status);
|
}
|
|
/**
|
* mei_hbm_cl_res - process hbm response received on behalf
|
* an client
|
*
|
* @dev: the device structure
|
* @rs: hbm client message
|
* @fop_type: file operation type
|
*/
|
static void mei_hbm_cl_res(struct mei_device *dev,
|
struct mei_hbm_cl_cmd *rs,
|
enum mei_cb_file_ops fop_type)
|
{
|
struct mei_cl *cl;
|
struct mei_cl_cb *cb, *next;
|
|
cl = NULL;
|
list_for_each_entry_safe(cb, next, &dev->ctrl_rd_list, list) {
|
|
cl = cb->cl;
|
|
if (cb->fop_type != fop_type)
|
continue;
|
|
if (mei_hbm_cl_addr_equal(cl, rs)) {
|
list_del_init(&cb->list);
|
break;
|
}
|
}
|
|
if (!cl)
|
return;
|
|
switch (fop_type) {
|
case MEI_FOP_CONNECT:
|
mei_hbm_cl_connect_res(dev, cl, rs);
|
break;
|
case MEI_FOP_DISCONNECT:
|
mei_hbm_cl_disconnect_res(dev, cl, rs);
|
break;
|
case MEI_FOP_NOTIFY_START:
|
mei_hbm_cl_notify_start_res(dev, cl, rs);
|
break;
|
case MEI_FOP_NOTIFY_STOP:
|
mei_hbm_cl_notify_stop_res(dev, cl, rs);
|
break;
|
default:
|
return;
|
}
|
|
cl->timer_count = 0;
|
wake_up(&cl->wait);
|
}
|
|
|
/**
|
* mei_hbm_fw_disconnect_req - disconnect request initiated by ME firmware
|
* host sends disconnect response
|
*
|
* @dev: the device structure.
|
* @disconnect_req: disconnect request bus message from the me
|
*
|
* Return: -ENOMEM on allocation failure
|
*/
|
static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
|
struct hbm_client_connect_request *disconnect_req)
|
{
|
struct mei_cl *cl;
|
struct mei_cl_cb *cb;
|
|
cl = mei_hbm_cl_find_by_cmd(dev, disconnect_req);
|
if (cl) {
|
cl_warn(dev, cl, "fw disconnect request received\n");
|
cl->state = MEI_FILE_DISCONNECTING;
|
cl->timer_count = 0;
|
|
cb = mei_cl_enqueue_ctrl_wr_cb(cl, 0, MEI_FOP_DISCONNECT_RSP,
|
NULL);
|
if (!cb)
|
return -ENOMEM;
|
}
|
return 0;
|
}
|
|
/**
|
* mei_hbm_pg_enter_res - PG enter response received
|
*
|
* @dev: the device structure.
|
*
|
* Return: 0 on success, -EPROTO on state mismatch
|
*/
|
static int mei_hbm_pg_enter_res(struct mei_device *dev)
|
{
|
if (mei_pg_state(dev) != MEI_PG_OFF ||
|
dev->pg_event != MEI_PG_EVENT_WAIT) {
|
dev_err(dev->dev, "hbm: pg entry response: state mismatch [%s, %d]\n",
|
mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
|
return -EPROTO;
|
}
|
|
dev->pg_event = MEI_PG_EVENT_RECEIVED;
|
wake_up(&dev->wait_pg);
|
|
return 0;
|
}
|
|
/**
|
* mei_hbm_pg_resume - process with PG resume
|
*
|
* @dev: the device structure.
|
*/
|
void mei_hbm_pg_resume(struct mei_device *dev)
|
{
|
pm_request_resume(dev->dev);
|
}
|
EXPORT_SYMBOL_GPL(mei_hbm_pg_resume);
|
|
/**
|
* mei_hbm_pg_exit_res - PG exit response received
|
*
|
* @dev: the device structure.
|
*
|
* Return: 0 on success, -EPROTO on state mismatch
|
*/
|
static int mei_hbm_pg_exit_res(struct mei_device *dev)
|
{
|
if (mei_pg_state(dev) != MEI_PG_ON ||
|
(dev->pg_event != MEI_PG_EVENT_WAIT &&
|
dev->pg_event != MEI_PG_EVENT_IDLE)) {
|
dev_err(dev->dev, "hbm: pg exit response: state mismatch [%s, %d]\n",
|
mei_pg_state_str(mei_pg_state(dev)), dev->pg_event);
|
return -EPROTO;
|
}
|
|
switch (dev->pg_event) {
|
case MEI_PG_EVENT_WAIT:
|
dev->pg_event = MEI_PG_EVENT_RECEIVED;
|
wake_up(&dev->wait_pg);
|
break;
|
case MEI_PG_EVENT_IDLE:
|
/*
|
* If the driver is not waiting on this then
|
* this is HW initiated exit from PG.
|
* Start runtime pm resume sequence to exit from PG.
|
*/
|
dev->pg_event = MEI_PG_EVENT_RECEIVED;
|
mei_hbm_pg_resume(dev);
|
break;
|
default:
|
WARN(1, "hbm: pg exit response: unexpected pg event = %d\n",
|
dev->pg_event);
|
return -EPROTO;
|
}
|
|
return 0;
|
}
|
|
/**
|
* mei_hbm_config_features - check what hbm features and commands
|
* are supported by the fw
|
*
|
* @dev: the device structure
|
*/
|
static void mei_hbm_config_features(struct mei_device *dev)
|
{
|
/* Power Gating Isolation Support */
|
dev->hbm_f_pg_supported = 0;
|
if (dev->version.major_version > HBM_MAJOR_VERSION_PGI)
|
dev->hbm_f_pg_supported = 1;
|
|
if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
|
dev->version.minor_version >= HBM_MINOR_VERSION_PGI)
|
dev->hbm_f_pg_supported = 1;
|
|
dev->hbm_f_dc_supported = 0;
|
if (dev->version.major_version >= HBM_MAJOR_VERSION_DC)
|
dev->hbm_f_dc_supported = 1;
|
|
dev->hbm_f_ie_supported = 0;
|
if (dev->version.major_version >= HBM_MAJOR_VERSION_IE)
|
dev->hbm_f_ie_supported = 1;
|
|
/* disconnect on connect timeout instead of link reset */
|
dev->hbm_f_dot_supported = 0;
|
if (dev->version.major_version >= HBM_MAJOR_VERSION_DOT)
|
dev->hbm_f_dot_supported = 1;
|
|
/* Notification Event Support */
|
dev->hbm_f_ev_supported = 0;
|
if (dev->version.major_version >= HBM_MAJOR_VERSION_EV)
|
dev->hbm_f_ev_supported = 1;
|
|
/* Fixed Address Client Support */
|
dev->hbm_f_fa_supported = 0;
|
if (dev->version.major_version >= HBM_MAJOR_VERSION_FA)
|
dev->hbm_f_fa_supported = 1;
|
|
/* OS ver message Support */
|
dev->hbm_f_os_supported = 0;
|
if (dev->version.major_version >= HBM_MAJOR_VERSION_OS)
|
dev->hbm_f_os_supported = 1;
|
|
/* DMA Ring Support */
|
dev->hbm_f_dr_supported = 0;
|
if (dev->version.major_version > HBM_MAJOR_VERSION_DR ||
|
(dev->version.major_version == HBM_MAJOR_VERSION_DR &&
|
dev->version.minor_version >= HBM_MINOR_VERSION_DR))
|
dev->hbm_f_dr_supported = 1;
|
|
/* VTag Support */
|
dev->hbm_f_vt_supported = 0;
|
if (dev->version.major_version > HBM_MAJOR_VERSION_VT ||
|
(dev->version.major_version == HBM_MAJOR_VERSION_VT &&
|
dev->version.minor_version >= HBM_MINOR_VERSION_VT))
|
dev->hbm_f_vt_supported = 1;
|
|
/* Capability message Support */
|
dev->hbm_f_cap_supported = 0;
|
if (dev->version.major_version > HBM_MAJOR_VERSION_CAP ||
|
(dev->version.major_version == HBM_MAJOR_VERSION_CAP &&
|
dev->version.minor_version >= HBM_MINOR_VERSION_CAP))
|
dev->hbm_f_cap_supported = 1;
|
}
|
|
/**
|
* mei_hbm_version_is_supported - checks whether the driver can
|
* support the hbm version of the device
|
*
|
* @dev: the device structure
|
* Return: true if driver can support hbm version of the device
|
*/
|
bool mei_hbm_version_is_supported(struct mei_device *dev)
|
{
|
return (dev->version.major_version < HBM_MAJOR_VERSION) ||
|
(dev->version.major_version == HBM_MAJOR_VERSION &&
|
dev->version.minor_version <= HBM_MINOR_VERSION);
|
}
|
|
/**
|
* mei_hbm_dispatch - bottom half read routine after ISR to
|
* handle the read bus message cmd processing.
|
*
|
* @dev: the device structure
|
* @hdr: header of bus message
|
*
|
* Return: 0 on success and < 0 on failure
|
*/
|
int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
|
{
|
struct mei_bus_message *mei_msg;
|
struct hbm_host_version_response *version_res;
|
struct hbm_props_response *props_res;
|
struct hbm_host_enum_response *enum_res;
|
struct hbm_dma_setup_response *dma_setup_res;
|
struct hbm_add_client_request *add_cl_req;
|
struct hbm_capability_response *capability_res;
|
int ret;
|
|
struct mei_hbm_cl_cmd *cl_cmd;
|
struct hbm_client_connect_request *disconnect_req;
|
struct hbm_flow_control *fctrl;
|
|
/* read the message to our buffer */
|
BUG_ON(hdr->length >= sizeof(dev->rd_msg_buf));
|
mei_read_slots(dev, dev->rd_msg_buf, hdr->length);
|
mei_msg = (struct mei_bus_message *)dev->rd_msg_buf;
|
cl_cmd = (struct mei_hbm_cl_cmd *)mei_msg;
|
|
/* ignore spurious message and prevent reset nesting
|
* hbm is put to idle during system reset
|
*/
|
if (dev->hbm_state == MEI_HBM_IDLE) {
|
dev_dbg(dev->dev, "hbm: state is idle ignore spurious messages\n");
|
return 0;
|
}
|
|
switch (mei_msg->hbm_cmd) {
|
case HOST_START_RES_CMD:
|
dev_dbg(dev->dev, "hbm: start: response message received.\n");
|
|
dev->init_clients_timer = 0;
|
|
version_res = (struct hbm_host_version_response *)mei_msg;
|
|
dev_dbg(dev->dev, "HBM VERSION: DRIVER=%02d:%02d DEVICE=%02d:%02d\n",
|
HBM_MAJOR_VERSION, HBM_MINOR_VERSION,
|
version_res->me_max_version.major_version,
|
version_res->me_max_version.minor_version);
|
|
if (version_res->host_version_supported) {
|
dev->version.major_version = HBM_MAJOR_VERSION;
|
dev->version.minor_version = HBM_MINOR_VERSION;
|
} else {
|
dev->version.major_version =
|
version_res->me_max_version.major_version;
|
dev->version.minor_version =
|
version_res->me_max_version.minor_version;
|
}
|
|
if (!mei_hbm_version_is_supported(dev)) {
|
dev_warn(dev->dev, "hbm: start: version mismatch - stopping the driver.\n");
|
|
dev->hbm_state = MEI_HBM_STOPPED;
|
if (mei_hbm_stop_req(dev)) {
|
dev_err(dev->dev, "hbm: start: failed to send stop request\n");
|
return -EIO;
|
}
|
break;
|
}
|
|
mei_hbm_config_features(dev);
|
|
if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
|
dev->hbm_state != MEI_HBM_STARTING) {
|
dev_err(dev->dev, "hbm: start: state mismatch, [%d, %d]\n",
|
dev->dev_state, dev->hbm_state);
|
return -EPROTO;
|
}
|
|
if (dev->hbm_f_cap_supported) {
|
if (mei_hbm_capabilities_req(dev))
|
return -EIO;
|
wake_up(&dev->wait_hbm_start);
|
break;
|
}
|
|
if (dev->hbm_f_dr_supported) {
|
if (mei_dmam_ring_alloc(dev))
|
dev_info(dev->dev, "running w/o dma ring\n");
|
if (mei_dma_ring_is_allocated(dev)) {
|
if (mei_hbm_dma_setup_req(dev))
|
return -EIO;
|
|
wake_up(&dev->wait_hbm_start);
|
break;
|
}
|
}
|
|
dev->hbm_f_dr_supported = 0;
|
mei_dmam_ring_free(dev);
|
|
if (mei_hbm_enum_clients_req(dev))
|
return -EIO;
|
|
wake_up(&dev->wait_hbm_start);
|
break;
|
|
case MEI_HBM_CAPABILITIES_RES_CMD:
|
dev_dbg(dev->dev, "hbm: capabilities response: message received.\n");
|
|
dev->init_clients_timer = 0;
|
|
if (dev->hbm_state != MEI_HBM_CAP_SETUP) {
|
dev_err(dev->dev, "hbm: capabilities response: state mismatch, [%d, %d]\n",
|
dev->dev_state, dev->hbm_state);
|
return -EPROTO;
|
}
|
|
capability_res = (struct hbm_capability_response *)mei_msg;
|
if (!(capability_res->capability_granted[0] & HBM_CAP_VT))
|
dev->hbm_f_vt_supported = 0;
|
|
if (dev->hbm_f_dr_supported) {
|
if (mei_dmam_ring_alloc(dev))
|
dev_info(dev->dev, "running w/o dma ring\n");
|
if (mei_dma_ring_is_allocated(dev)) {
|
if (mei_hbm_dma_setup_req(dev))
|
return -EIO;
|
break;
|
}
|
}
|
|
dev->hbm_f_dr_supported = 0;
|
mei_dmam_ring_free(dev);
|
|
if (mei_hbm_enum_clients_req(dev))
|
return -EIO;
|
break;
|
|
case MEI_HBM_DMA_SETUP_RES_CMD:
|
dev_dbg(dev->dev, "hbm: dma setup response: message received.\n");
|
|
dev->init_clients_timer = 0;
|
|
if (dev->hbm_state != MEI_HBM_DR_SETUP) {
|
dev_err(dev->dev, "hbm: dma setup response: state mismatch, [%d, %d]\n",
|
dev->dev_state, dev->hbm_state);
|
return -EPROTO;
|
}
|
|
dma_setup_res = (struct hbm_dma_setup_response *)mei_msg;
|
|
if (dma_setup_res->status) {
|
u8 status = dma_setup_res->status;
|
|
if (status == MEI_HBMS_NOT_ALLOWED) {
|
dev_dbg(dev->dev, "hbm: dma setup not allowed\n");
|
} else {
|
dev_info(dev->dev, "hbm: dma setup response: failure = %d %s\n",
|
status,
|
mei_hbm_status_str(status));
|
}
|
dev->hbm_f_dr_supported = 0;
|
mei_dmam_ring_free(dev);
|
}
|
|
if (mei_hbm_enum_clients_req(dev))
|
return -EIO;
|
break;
|
|
case CLIENT_CONNECT_RES_CMD:
|
dev_dbg(dev->dev, "hbm: client connect response: message received.\n");
|
mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_CONNECT);
|
break;
|
|
case CLIENT_DISCONNECT_RES_CMD:
|
dev_dbg(dev->dev, "hbm: client disconnect response: message received.\n");
|
mei_hbm_cl_res(dev, cl_cmd, MEI_FOP_DISCONNECT);
|
break;
|
|
case MEI_FLOW_CONTROL_CMD:
|
dev_dbg(dev->dev, "hbm: client flow control response: message received.\n");
|
|
fctrl = (struct hbm_flow_control *)mei_msg;
|
mei_hbm_cl_tx_flow_ctrl_creds_res(dev, fctrl);
|
break;
|
|
case MEI_PG_ISOLATION_ENTRY_RES_CMD:
|
dev_dbg(dev->dev, "hbm: power gate isolation entry response received\n");
|
ret = mei_hbm_pg_enter_res(dev);
|
if (ret)
|
return ret;
|
break;
|
|
case MEI_PG_ISOLATION_EXIT_REQ_CMD:
|
dev_dbg(dev->dev, "hbm: power gate isolation exit request received\n");
|
ret = mei_hbm_pg_exit_res(dev);
|
if (ret)
|
return ret;
|
break;
|
|
case HOST_CLIENT_PROPERTIES_RES_CMD:
|
dev_dbg(dev->dev, "hbm: properties response: message received.\n");
|
|
dev->init_clients_timer = 0;
|
|
if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
|
dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
|
dev_err(dev->dev, "hbm: properties response: state mismatch, [%d, %d]\n",
|
dev->dev_state, dev->hbm_state);
|
return -EPROTO;
|
}
|
|
props_res = (struct hbm_props_response *)mei_msg;
|
|
if (props_res->status == MEI_HBMS_CLIENT_NOT_FOUND) {
|
dev_dbg(dev->dev, "hbm: properties response: %d CLIENT_NOT_FOUND\n",
|
props_res->me_addr);
|
} else if (props_res->status) {
|
dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
|
props_res->status,
|
mei_hbm_status_str(props_res->status));
|
return -EPROTO;
|
} else {
|
mei_hbm_me_cl_add(dev, props_res);
|
}
|
|
/* request property for the next client */
|
if (mei_hbm_prop_req(dev, props_res->me_addr + 1))
|
return -EIO;
|
|
break;
|
|
case HOST_ENUM_RES_CMD:
|
dev_dbg(dev->dev, "hbm: enumeration response: message received\n");
|
|
dev->init_clients_timer = 0;
|
|
enum_res = (struct hbm_host_enum_response *) mei_msg;
|
BUILD_BUG_ON(sizeof(dev->me_clients_map)
|
< sizeof(enum_res->valid_addresses));
|
memcpy(dev->me_clients_map, enum_res->valid_addresses,
|
sizeof(enum_res->valid_addresses));
|
|
if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
|
dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
|
dev_err(dev->dev, "hbm: enumeration response: state mismatch, [%d, %d]\n",
|
dev->dev_state, dev->hbm_state);
|
return -EPROTO;
|
}
|
|
dev->hbm_state = MEI_HBM_CLIENT_PROPERTIES;
|
|
/* first property request */
|
if (mei_hbm_prop_req(dev, 0))
|
return -EIO;
|
|
break;
|
|
case HOST_STOP_RES_CMD:
|
dev_dbg(dev->dev, "hbm: stop response: message received\n");
|
|
dev->init_clients_timer = 0;
|
|
if (dev->hbm_state != MEI_HBM_STOPPED) {
|
dev_err(dev->dev, "hbm: stop response: state mismatch, [%d, %d]\n",
|
dev->dev_state, dev->hbm_state);
|
return -EPROTO;
|
}
|
|
mei_set_devstate(dev, MEI_DEV_POWER_DOWN);
|
dev_info(dev->dev, "hbm: stop response: resetting.\n");
|
/* force the reset */
|
return -EPROTO;
|
break;
|
|
case CLIENT_DISCONNECT_REQ_CMD:
|
dev_dbg(dev->dev, "hbm: disconnect request: message received\n");
|
|
disconnect_req = (struct hbm_client_connect_request *)mei_msg;
|
mei_hbm_fw_disconnect_req(dev, disconnect_req);
|
break;
|
|
case ME_STOP_REQ_CMD:
|
dev_dbg(dev->dev, "hbm: stop request: message received\n");
|
dev->hbm_state = MEI_HBM_STOPPED;
|
if (mei_hbm_stop_req(dev)) {
|
dev_err(dev->dev, "hbm: stop request: failed to send stop request\n");
|
return -EIO;
|
}
|
break;
|
|
case MEI_HBM_ADD_CLIENT_REQ_CMD:
|
dev_dbg(dev->dev, "hbm: add client request received\n");
|
/*
|
* after the host receives the enum_resp
|
* message clients may be added or removed
|
*/
|
if (dev->hbm_state <= MEI_HBM_ENUM_CLIENTS ||
|
dev->hbm_state >= MEI_HBM_STOPPED) {
|
dev_err(dev->dev, "hbm: add client: state mismatch, [%d, %d]\n",
|
dev->dev_state, dev->hbm_state);
|
return -EPROTO;
|
}
|
add_cl_req = (struct hbm_add_client_request *)mei_msg;
|
ret = mei_hbm_fw_add_cl_req(dev, add_cl_req);
|
if (ret) {
|
dev_err(dev->dev, "hbm: add client: failed to send response %d\n",
|
ret);
|
return -EIO;
|
}
|
dev_dbg(dev->dev, "hbm: add client request processed\n");
|
break;
|
|
case MEI_HBM_NOTIFY_RES_CMD:
|
dev_dbg(dev->dev, "hbm: notify response received\n");
|
mei_hbm_cl_res(dev, cl_cmd, notify_res_to_fop(cl_cmd));
|
break;
|
|
case MEI_HBM_NOTIFICATION_CMD:
|
dev_dbg(dev->dev, "hbm: notification\n");
|
mei_hbm_cl_notify(dev, cl_cmd);
|
break;
|
|
default:
|
WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd);
|
return -EPROTO;
|
|
}
|
return 0;
|
}
|
