- 根目录:
- drivers
- misc
- mei
- hbm.c
/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2003-2012, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/mei.h>
#include "mei_dev.h"
#include "hbm.h"
#include "client.h"
static const char *mei_hbm_status_str(enum mei_hbm_status status)
{
#define MEI_HBM_STATUS(status) case MEI_HBMS_##status: return #status
switch (status) {
MEI_HBM_STATUS(SUCCESS);
MEI_HBM_STATUS(CLIENT_NOT_FOUND);
MEI_HBM_STATUS(ALREADY_EXISTS);
MEI_HBM_STATUS(REJECTED);
MEI_HBM_STATUS(INVALID_PARAMETER);
MEI_HBM_STATUS(NOT_ALLOWED);
MEI_HBM_STATUS(ALREADY_STARTED);
MEI_HBM_STATUS(NOT_STARTED);
default: return "unknown";
}
#undef MEI_HBM_STATUS
};
static const char *mei_cl_conn_status_str(enum mei_cl_connect_status status)
{
#define MEI_CL_CS(status) case MEI_CL_CONN_##status: return #status
switch (status) {
MEI_CL_CS(SUCCESS);
MEI_CL_CS(NOT_FOUND);
MEI_CL_CS(ALREADY_STARTED);
MEI_CL_CS(OUT_OF_RESOURCES);
MEI_CL_CS(MESSAGE_SMALL);
default: return "unknown";
}
#undef MEI_CL_CCS
}
const char *mei_hbm_state_str(enum mei_hbm_state state)
{
#define MEI_HBM_STATE(state) case MEI_HBM_##state: return #state
switch (state) {
MEI_HBM_STATE(IDLE);
MEI_HBM_STATE(STARTING);
MEI_HBM_STATE(STARTED);
MEI_HBM_STATE(ENUM_CLIENTS);
MEI_HBM_STATE(CLIENT_PROPERTIES);
MEI_HBM_STATE(STOPPED);
default:
return "unknown";
}
#undef MEI_HBM_STATE
}
/**
* mei_cl_conn_status_to_errno - convert client connect response
* status to error code
*
* @status: client connect response status
*
* Return: corresponding error code
*/
static int mei_cl_conn_status_to_errno(enum mei_cl_connect_status status)
{
switch (status) {
case MEI_CL_CONN_SUCCESS: return 0;
case MEI_CL_CONN_NOT_FOUND: return -ENOTTY;
case MEI_CL_CONN_ALREADY_STARTED: return -EBUSY;
case MEI_CL_CONN_OUT_OF_RESOURCES: return -EBUSY;
case MEI_CL_CONN_MESSAGE_SMALL: return -EINVAL;
default: return -EINVAL;
}
}
/**
* mei_hbm_idle - set hbm to idle state
*
* @dev: the device structure
*/
void mei_hbm_idle(struct mei_device *dev)
{
dev->init_clients_timer = 0;
dev->hbm_state = MEI_HBM_IDLE;
}
/**
* mei_hbm_reset - reset hbm counters and book keeping data structurs
*
* @dev: the device structure
*/
void mei_hbm_reset(struct mei_device *dev)
{
dev->me_client_index = 0;
mei_me_cl_rm_all(dev);
mei_hbm_idle(dev);
}
/**
* mei_hbm_hdr - construct hbm header
*
* @hdr: hbm header
* @length: payload length
*/
static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
{
hdr->host_addr = 0;
hdr->me_addr = 0;
hdr->length = length;
hdr->msg_complete = 1;
hdr->reserved = 0;
}
/**
* mei_hbm_cl_hdr - construct client hbm header
*
* @cl: client
* @hbm_cmd: host bus message command
* @buf: buffer for cl header
* @len: buffer length
*/
static inline
void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
{
struct mei_hbm_cl_cmd *cmd = buf;
memset(cmd, 0, len);
cmd->hbm_cmd = hbm_cmd;
cmd->host_addr = cl->host_client_id;
cmd->me_addr = cl->me_client_id;
}
/**
* mei_hbm_cl_write - write simple hbm client message
*
* @dev: the device structure
* @cl: client
* @hbm_cmd: host bus message command
* @len: buffer length
*
* Return: 0 on success, <0 on failure.
*/
static inline
int mei_hbm_cl_write(struct mei_device *dev,
struct mei_cl *cl, u8 hbm_cmd, size_t len)
{
struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
mei_hbm_hdr(mei_hdr, len);
mei_hbm_cl_hdr(cl, hbm_cmd, dev->wr_msg.data, len);
return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
}
/**
* mei_hbm_cl_addr_equal - check if the client's and
* the message address match
*
* @cl: client
* @cmd: hbm client message
*
* Return: true if addresses are the same
*/
static inline
bool mei_hbm_cl_addr_equal(struct mei_cl *cl, struct mei_hbm_cl_cmd *cmd)
{
return cl->host_client_id == cmd->host_addr &&
cl->me_client_id == cmd->me_addr;
}
/**
* mei_hbm_cl_find_by_cmd - find recipient client
*
* @dev: the device structure
* @buf: a buffer with hbm cl command
*
* Return: the recipient client or NULL if not found
*/
static inline
struct mei_cl *mei_hbm_cl_find_by_cmd(struct mei_device *dev, void *buf)
{
struct mei_hbm_cl_cmd *cmd = (struct mei_hbm_cl_cmd *)buf;
struct mei_cl *cl;
list_for_each_entry(cl, &dev->file_list, link)
if (mei_hbm_cl_addr_equal(cl, cmd))
return cl;
return NULL;
}
/**
* mei_hbm_start_wait - wait for start response message.
*
* @dev: the device structure
*
* Return: 0 on success and < 0 on failure
*/
int mei_hbm_start_wait(struct mei_device *dev)
{
int ret;
if (dev->hbm_state > MEI_HBM_STARTING)
return 0;
mutex_unlock(&dev->device_lock);
ret = wait_event_timeout(dev->wait_hbm_start,
dev->hbm_state != MEI_HBM_STARTING,
mei_secs_to_jiffies(MEI_HBM_TIMEOUT));
mutex_lock(&dev->device_lock);
if (ret == 0 && (dev->hbm_state <= MEI_HBM_STARTING)) {
dev->hbm_state = MEI_HBM_IDLE;
dev_err(dev->dev, "waiting for mei start failed\n");
return -ETIME;
}
return 0;
}
/**
* mei_hbm_start_req - sends start request message.
*
* @dev: the device structure
*
* Return: 0 on success and < 0 on failure
*/
int mei_hbm_start_req(struct mei_device *dev)
{
struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
struct hbm_host_version_request *start_req;
const size_t len = sizeof(struct hbm_host_version_request);
int ret;
mei_hbm_reset(dev);
mei_hbm_hdr(mei_hdr, len);
/* host start message */
start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
memset(start_req, 0, len);
start_req->hbm_cmd = HOST_START_REQ_CMD;
start_req->host_version.major_version = HBM_MAJOR_VERSION;
start_req->host_version.minor_version = HBM_MINOR_VERSION;
dev->hbm_state = MEI_HBM_IDLE;
ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
if (ret) {
dev_err(dev->dev, "version message write failed: ret = %d\n",
ret);
return ret;
}
dev->hbm_state = MEI_HBM_STARTING;
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
return 0;
}
/*
* mei_hbm_enum_clients_req - sends enumeration client request message.
*
* @dev: the device structure
*
* Return: 0 on success and < 0 on failure
*/
static int mei_hbm_enum_clients_req(struct mei_device *dev)
{
struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
struct hbm_host_enum_request *enum_req;
const size_t len = sizeof(struct hbm_host_enum_request);
int ret;
/* enumerate clients */
mei_hbm_hdr(mei_hdr, len);
enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
memset(enum_req, 0, len);
enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
if (ret) {
dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
ret);
return ret;
}
dev->hbm_state = MEI_HBM_ENUM_CLIENTS;
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
return 0;
}
/*
* mei_hbm_me_cl_add - add new me client to the list
*
* @dev: the device structure
* @res: hbm property response
*
* Return: 0 on success and -ENOMEM on allocation failure
*/
static int mei_hbm_me_cl_add(struct mei_device *dev,
struct hbm_props_response *res)
{
struct mei_me_client *me_cl;
const uuid_le *uuid = &res->client_properties.protocol_name;
mei_me_cl_rm_by_uuid(dev, uuid);
me_cl = kzalloc(sizeof(struct mei_me_client), GFP_KERNEL);
if (!me_cl)
return -ENOMEM;
mei_me_cl_init(me_cl);
me_cl->props = res->client_properties;
me_cl->client_id = res->me_addr;
me_cl->mei_flow_ctrl_creds = 0;
mei_me_cl_add(dev, me_cl);
return 0;
}
/**
* mei_hbm_prop_req - request property for a single client
*
* @dev: the device structure
*
* Return: 0 on success and < 0 on failure
*/
static int mei_hbm_prop_req(struct mei_device *dev)
{
struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
struct hbm_props_request *prop_req;
const size_t len = sizeof(struct hbm_props_request);
unsigned long next_client_index;
int ret;
next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX,
dev->me_client_index);
/* We got all client properties */
if (next_client_index == MEI_CLIENTS_MAX) {
dev->hbm_state = MEI_HBM_STARTED;
schedule_work(&dev->init_work);
return 0;
}
mei_hbm_hdr(mei_hdr, len);
prop_req = (struct hbm_props_request *)dev->wr_msg.data;
memset(prop_req, 0, sizeof(struct hbm_props_request));
prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
prop_req->me_addr = next_client_index;
ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
if (ret) {
dev_err(dev->dev, "properties request write failed: ret = %d\n",
ret);
return ret;
}
dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT;
dev->me_client_index = next_client_index;
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 = &dev->wr_msg.hdr;
struct hbm_power_gate *req;
const size_t len = sizeof(struct hbm_power_gate);
int ret;
if (!dev->hbm_f_pg_supported)
return -EOPNOTSUPP;
mei_hbm_hdr(mei_hdr, len);
req = (struct hbm_power_gate *)dev->wr_msg.data;
memset(req, 0, len);
req->hbm_cmd = pg_cmd;
ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
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 = &dev->wr_msg.hdr;
struct hbm_host_stop_request *req =
(struct hbm_host_stop_request *)dev->wr_msg.data;
const size_t len = sizeof(struct hbm_host_stop_request);
mei_hbm_hdr(mei_hdr, len);
memset(req, 0, len);
req->hbm_cmd = HOST_STOP_REQ_CMD;
req->reason = DRIVER_STOP_REQUEST;
return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
}
/**
* 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)
{
const size_t len = sizeof(struct hbm_flow_control);
cl_dbg(dev, cl, "sending flow control\n");
return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD, len);
}
/**
* mei_hbm_add_single_flow_creds - adds single buffer credentials.
*
* @dev: the device structure
* @flow: flow control.
*
* Return: 0 on success, < 0 otherwise
*/
static int mei_hbm_add_single_flow_creds(struct mei_device *dev,
struct hbm_flow_control *flow)
{
struct mei_me_client *me_cl;
int rets;
me_cl = mei_me_cl_by_id(dev, flow->me_addr);
if (!me_cl) {
dev_err(dev->dev, "no such me client %d\n",
flow->me_addr);
return -ENOENT;
}
if (WARN_ON(me_cl->props.single_recv_buf == 0)) {
rets = -EINVAL;
goto out;
}
me_cl->mei_flow_ctrl_creds++;
dev_dbg(dev->dev, "recv flow ctrl msg ME %d (single) creds = %d.\n",
flow->me_addr, me_cl->mei_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
* @flow_control: flow control response bus message
*/
static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
struct hbm_flow_control *flow_control)
{
struct mei_cl *cl;
if (!flow_control->host_addr) {
/* single receive buffer */
mei_hbm_add_single_flow_creds(dev, flow_control);
return;
}
cl = mei_hbm_cl_find_by_cmd(dev, flow_control);
if (cl) {
cl->mei_flow_ctrl_creds++;
cl_dbg(dev, cl, "flow control creds = %d.\n",
cl->mei_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)
{
const size_t len = sizeof(struct hbm_client_connect_request);
return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD, len);
}
/**
* 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)
{
const size_t len = sizeof(struct hbm_client_connect_response);
return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD, len);
}
/**
* 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_DISCONNECTED;
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)
{
const size_t len = sizeof(struct hbm_client_connect_request);
return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD, len);
}
/**
* 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_DISCONNECTED;
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, 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;
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_dbg(dev, cl, "disconnect request received\n");
cl->state = MEI_FILE_DISCONNECTED;
cl->timer_count = 0;
cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT_RSP, NULL);
if (!cb)
return -ENOMEM;
cl_dbg(dev, cl, "add disconnect response as first\n");
list_add(&cb->list, &dev->ctrl_wr_list.list);
}
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;
}
/**
* 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 mei_hbm_cl_cmd *cl_cmd;
struct hbm_client_connect_request *disconnect_req;
struct hbm_flow_control *flow_control;
/* 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 (mei_hbm_enum_clients_req(dev)) {
dev_err(dev->dev, "hbm: start: failed to send enumeration request\n");
return -EIO;
}
wake_up(&dev->wait_hbm_start);
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");
flow_control = (struct hbm_flow_control *) mei_msg;
mei_hbm_cl_flow_control_res(dev, flow_control);
break;
case MEI_PG_ISOLATION_ENTRY_RES_CMD:
dev_dbg(dev->dev, "power gate isolation entry response received\n");
dev->pg_event = MEI_PG_EVENT_RECEIVED;
if (waitqueue_active(&dev->wait_pg))
wake_up(&dev->wait_pg);
break;
case MEI_PG_ISOLATION_EXIT_REQ_CMD:
dev_dbg(dev->dev, "power gate isolation exit request received\n");
dev->pg_event = MEI_PG_EVENT_RECEIVED;
if (waitqueue_active(&dev->wait_pg))
wake_up(&dev->wait_pg);
else
/*
* 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.
*/
pm_request_resume(dev->dev);
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) {
dev_err(dev->dev, "hbm: properties response: wrong status = %d %s\n",
props_res->status,
mei_hbm_status_str(props_res->status));
return -EPROTO;
}
mei_hbm_me_cl_add(dev, props_res);
dev->me_client_index++;
/* request property for the next client */
if (mei_hbm_prop_req(dev))
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))
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;
}
dev->dev_state = 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;
default:
BUG();
break;
}
return 0;
}