Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 | /*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2015 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that 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.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Intel MIC COSM Client Driver
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/kthread.h>
#include "../cosm/cosm_main.h"
#define COSM_SCIF_MAX_RETRIES 10
#define COSM_HEARTBEAT_SEND_MSEC (COSM_HEARTBEAT_SEND_SEC * MSEC_PER_SEC)
static struct task_struct *client_thread;
static scif_epd_t client_epd;
static struct scif_peer_dev *client_spdev;
/*
* Reboot notifier: receives shutdown status from the OS and communicates it
* back to the COSM process on the host
*/
static int cosm_reboot_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct cosm_msg msg = { .id = COSM_MSG_SHUTDOWN_STATUS };
int rc;
event = (event == SYS_RESTART) ? SYSTEM_RESTART : event;
dev_info(&client_spdev->dev, "%s %d received event %ld\n",
__func__, __LINE__, event);
msg.shutdown_status = event;
rc = scif_send(client_epd, &msg, sizeof(msg), SCIF_SEND_BLOCK);
if (rc < 0)
dev_err(&client_spdev->dev, "%s %d scif_send rc %d\n",
__func__, __LINE__, rc);
return NOTIFY_DONE;
}
static struct notifier_block cosm_reboot = {
.notifier_call = cosm_reboot_event,
};
/* Set system time from timespec value received from the host */
static void cosm_set_time(struct cosm_msg *msg)
{
int rc = do_settimeofday64(&msg->timespec);
if (rc)
dev_err(&client_spdev->dev, "%s: %d settimeofday rc %d\n",
__func__, __LINE__, rc);
}
/* COSM client receive message processing */
static void cosm_client_recv(void)
{
struct cosm_msg msg;
int rc;
while (1) {
rc = scif_recv(client_epd, &msg, sizeof(msg), 0);
if (!rc) {
return;
} else if (rc < 0) {
dev_err(&client_spdev->dev, "%s: %d rc %d\n",
__func__, __LINE__, rc);
return;
}
dev_dbg(&client_spdev->dev, "%s: %d rc %d id 0x%llx\n",
__func__, __LINE__, rc, msg.id);
switch (msg.id) {
case COSM_MSG_SYNC_TIME:
cosm_set_time(&msg);
break;
case COSM_MSG_SHUTDOWN:
orderly_poweroff(true);
break;
default:
dev_err(&client_spdev->dev, "%s: %d unknown id %lld\n",
__func__, __LINE__, msg.id);
break;
}
}
}
/* Initiate connection to the COSM server on the host */
static int cosm_scif_connect(void)
{
struct scif_port_id port_id;
int i, rc;
client_epd = scif_open();
if (!client_epd) {
dev_err(&client_spdev->dev, "%s %d scif_open failed\n",
__func__, __LINE__);
return -ENOMEM;
}
port_id.node = 0;
port_id.port = SCIF_COSM_LISTEN_PORT;
for (i = 0; i < COSM_SCIF_MAX_RETRIES; i++) {
rc = scif_connect(client_epd, &port_id);
if (rc < 0)
msleep(1000);
else
break;
}
if (rc < 0) {
dev_err(&client_spdev->dev, "%s %d scif_connect rc %d\n",
__func__, __LINE__, rc);
scif_close(client_epd);
client_epd = NULL;
}
return rc < 0 ? rc : 0;
}
/* Close host SCIF connection */
static void cosm_scif_connect_exit(void)
{
if (client_epd) {
scif_close(client_epd);
client_epd = NULL;
}
}
/*
* COSM SCIF client thread function: waits for messages from the host and sends
* a heartbeat to the host
*/
static int cosm_scif_client(void *unused)
{
struct cosm_msg msg = { .id = COSM_MSG_HEARTBEAT };
struct scif_pollepd pollepd;
int rc;
allow_signal(SIGKILL);
while (!kthread_should_stop()) {
pollepd.epd = client_epd;
pollepd.events = POLLIN;
rc = scif_poll(&pollepd, 1, COSM_HEARTBEAT_SEND_MSEC);
if (rc < 0) {
if (-EINTR != rc)
dev_err(&client_spdev->dev,
"%s %d scif_poll rc %d\n",
__func__, __LINE__, rc);
continue;
}
if (pollepd.revents & POLLIN)
cosm_client_recv();
msg.id = COSM_MSG_HEARTBEAT;
rc = scif_send(client_epd, &msg, sizeof(msg), SCIF_SEND_BLOCK);
if (rc < 0)
dev_err(&client_spdev->dev, "%s %d scif_send rc %d\n",
__func__, __LINE__, rc);
}
dev_dbg(&client_spdev->dev, "%s %d Client thread stopped\n",
__func__, __LINE__);
return 0;
}
static void cosm_scif_probe(struct scif_peer_dev *spdev)
{
int rc;
dev_dbg(&spdev->dev, "%s %d: dnode %d\n",
__func__, __LINE__, spdev->dnode);
/* We are only interested in the host with spdev->dnode == 0 */
if (spdev->dnode)
return;
client_spdev = spdev;
rc = cosm_scif_connect();
if (rc)
goto exit;
rc = register_reboot_notifier(&cosm_reboot);
if (rc) {
dev_err(&spdev->dev,
"reboot notifier registration failed rc %d\n", rc);
goto connect_exit;
}
client_thread = kthread_run(cosm_scif_client, NULL, "cosm_client");
if (IS_ERR(client_thread)) {
rc = PTR_ERR(client_thread);
dev_err(&spdev->dev, "%s %d kthread_run rc %d\n",
__func__, __LINE__, rc);
goto unreg_reboot;
}
return;
unreg_reboot:
unregister_reboot_notifier(&cosm_reboot);
connect_exit:
cosm_scif_connect_exit();
exit:
client_spdev = NULL;
}
static void cosm_scif_remove(struct scif_peer_dev *spdev)
{
int rc;
dev_dbg(&spdev->dev, "%s %d: dnode %d\n",
__func__, __LINE__, spdev->dnode);
if (spdev->dnode)
return;
if (!IS_ERR_OR_NULL(client_thread)) {
rc = send_sig(SIGKILL, client_thread, 0);
if (rc) {
pr_err("%s %d send_sig rc %d\n",
__func__, __LINE__, rc);
return;
}
kthread_stop(client_thread);
}
unregister_reboot_notifier(&cosm_reboot);
cosm_scif_connect_exit();
client_spdev = NULL;
}
static struct scif_client scif_client_cosm = {
.name = KBUILD_MODNAME,
.probe = cosm_scif_probe,
.remove = cosm_scif_remove,
};
static int __init cosm_client_init(void)
{
int rc = scif_client_register(&scif_client_cosm);
if (rc)
pr_err("scif_client_register failed rc %d\n", rc);
return rc;
}
static void __exit cosm_client_exit(void)
{
scif_client_unregister(&scif_client_cosm);
}
module_init(cosm_client_init);
module_exit(cosm_client_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) MIC card OS state management client driver");
MODULE_LICENSE("GPL v2");
|