cosm_sysfs.c
/*
* 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 Coprocessor State Management (COSM) Driver
*
*/
#include <linux/slab.h>
#include "cosm_main.h"
/*
* A state-to-string lookup table, for exposing a human readable state
* via sysfs. Always keep in sync with enum cosm_states
*/
const char * const cosm_state_string[] = {
[MIC_READY] = "ready",
[MIC_BOOTING] = "booting",
[MIC_ONLINE] = "online",
[MIC_SHUTTING_DOWN] = "shutting_down",
[MIC_RESETTING] = "resetting",
[MIC_RESET_FAILED] = "reset_failed",
};
/*
* A shutdown-status-to-string lookup table, for exposing a human
* readable state via sysfs. Always keep in sync with enum cosm_shutdown_status
*/
const char * const cosm_shutdown_status_string[] = {
[MIC_NOP] = "nop",
[MIC_CRASHED] = "crashed",
[MIC_HALTED] = "halted",
[MIC_POWER_OFF] = "poweroff",
[MIC_RESTART] = "restart",
};
void cosm_set_shutdown_status(struct cosm_device *cdev, u8 shutdown_status)
{
dev_dbg(&cdev->dev, "Shutdown Status %s -> %s\n",
cosm_shutdown_status_string[cdev->shutdown_status],
cosm_shutdown_status_string[shutdown_status]);
cdev->shutdown_status = shutdown_status;
}
void cosm_set_state(struct cosm_device *cdev, u8 state)
{
dev_dbg(&cdev->dev, "State %s -> %s\n",
cosm_state_string[cdev->state],
cosm_state_string[state]);
cdev->state = state;
sysfs_notify_dirent(cdev->state_sysfs);
}
static ssize_t
family_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
return cdev->hw_ops->family(cdev, buf);
}
static DEVICE_ATTR_RO(family);
static ssize_t
stepping_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
return cdev->hw_ops->stepping(cdev, buf);
}
static DEVICE_ATTR_RO(stepping);
static ssize_t
state_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev || cdev->state >= MIC_LAST)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%s\n",
cosm_state_string[cdev->state]);
}
static ssize_t
state_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
int rc;
if (!cdev)
return -EINVAL;
if (sysfs_streq(buf, "boot")) {
rc = cosm_start(cdev);
goto done;
}
if (sysfs_streq(buf, "reset")) {
rc = cosm_reset(cdev);
goto done;
}
if (sysfs_streq(buf, "shutdown")) {
rc = cosm_shutdown(cdev);
goto done;
}
rc = -EINVAL;
done:
if (rc)
count = rc;
return count;
}
static DEVICE_ATTR_RW(state);
static ssize_t shutdown_status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev || cdev->shutdown_status >= MIC_STATUS_LAST)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%s\n",
cosm_shutdown_status_string[cdev->shutdown_status]);
}
static DEVICE_ATTR_RO(shutdown_status);
static ssize_t
heartbeat_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%d\n", cdev->sysfs_heartbeat_enable);
}
static ssize_t
heartbeat_enable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
int enable;
int ret;
if (!cdev)
return -EINVAL;
mutex_lock(&cdev->cosm_mutex);
ret = kstrtoint(buf, 10, &enable);
if (ret)
goto unlock;
cdev->sysfs_heartbeat_enable = enable;
/* if state is not online, cdev->heartbeat_watchdog_enable is 0 */
if (cdev->state == MIC_ONLINE)
cdev->heartbeat_watchdog_enable = enable;
ret = count;
unlock:
mutex_unlock(&cdev->cosm_mutex);
return ret;
}
static DEVICE_ATTR_RW(heartbeat_enable);
static ssize_t
cmdline_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
char *cmdline;
if (!cdev)
return -EINVAL;
cmdline = cdev->cmdline;
if (cmdline)
return scnprintf(buf, PAGE_SIZE, "%s\n", cmdline);
return 0;
}
static ssize_t
cmdline_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
mutex_lock(&cdev->cosm_mutex);
kfree(cdev->cmdline);
cdev->cmdline = kmalloc(count + 1, GFP_KERNEL);
if (!cdev->cmdline) {
count = -ENOMEM;
goto unlock;
}
strncpy(cdev->cmdline, buf, count);
if (cdev->cmdline[count - 1] == '\n')
cdev->cmdline[count - 1] = '\0';
else
cdev->cmdline[count] = '\0';
unlock:
mutex_unlock(&cdev->cosm_mutex);
return count;
}
static DEVICE_ATTR_RW(cmdline);
static ssize_t
firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
char *firmware;
if (!cdev)
return -EINVAL;
firmware = cdev->firmware;
if (firmware)
return scnprintf(buf, PAGE_SIZE, "%s\n", firmware);
return 0;
}
static ssize_t
firmware_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
mutex_lock(&cdev->cosm_mutex);
kfree(cdev->firmware);
cdev->firmware = kmalloc(count + 1, GFP_KERNEL);
if (!cdev->firmware) {
count = -ENOMEM;
goto unlock;
}
strncpy(cdev->firmware, buf, count);
if (cdev->firmware[count - 1] == '\n')
cdev->firmware[count - 1] = '\0';
else
cdev->firmware[count] = '\0';
unlock:
mutex_unlock(&cdev->cosm_mutex);
return count;
}
static DEVICE_ATTR_RW(firmware);
static ssize_t
ramdisk_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
char *ramdisk;
if (!cdev)
return -EINVAL;
ramdisk = cdev->ramdisk;
if (ramdisk)
return scnprintf(buf, PAGE_SIZE, "%s\n", ramdisk);
return 0;
}
static ssize_t
ramdisk_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
mutex_lock(&cdev->cosm_mutex);
kfree(cdev->ramdisk);
cdev->ramdisk = kmalloc(count + 1, GFP_KERNEL);
if (!cdev->ramdisk) {
count = -ENOMEM;
goto unlock;
}
strncpy(cdev->ramdisk, buf, count);
if (cdev->ramdisk[count - 1] == '\n')
cdev->ramdisk[count - 1] = '\0';
else
cdev->ramdisk[count] = '\0';
unlock:
mutex_unlock(&cdev->cosm_mutex);
return count;
}
static DEVICE_ATTR_RW(ramdisk);
static ssize_t
bootmode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
char *bootmode;
if (!cdev)
return -EINVAL;
bootmode = cdev->bootmode;
if (bootmode)
return scnprintf(buf, PAGE_SIZE, "%s\n", bootmode);
return 0;
}
static ssize_t
bootmode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
if (!sysfs_streq(buf, "linux") && !sysfs_streq(buf, "flash"))
return -EINVAL;
mutex_lock(&cdev->cosm_mutex);
kfree(cdev->bootmode);
cdev->bootmode = kmalloc(count + 1, GFP_KERNEL);
if (!cdev->bootmode) {
count = -ENOMEM;
goto unlock;
}
strncpy(cdev->bootmode, buf, count);
if (cdev->bootmode[count - 1] == '\n')
cdev->bootmode[count - 1] = '\0';
else
cdev->bootmode[count] = '\0';
unlock:
mutex_unlock(&cdev->cosm_mutex);
return count;
}
static DEVICE_ATTR_RW(bootmode);
static ssize_t
log_buf_addr_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_addr);
}
static ssize_t
log_buf_addr_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
int ret;
unsigned long addr;
if (!cdev)
return -EINVAL;
ret = kstrtoul(buf, 16, &addr);
if (ret)
goto exit;
cdev->log_buf_addr = (void *)addr;
ret = count;
exit:
return ret;
}
static DEVICE_ATTR_RW(log_buf_addr);
static ssize_t
log_buf_len_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
if (!cdev)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_len);
}
static ssize_t
log_buf_len_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cosm_device *cdev = dev_get_drvdata(dev);
int ret;
unsigned long addr;
if (!cdev)
return -EINVAL;
ret = kstrtoul(buf, 16, &addr);
if (ret)
goto exit;
cdev->log_buf_len = (int *)addr;
ret = count;
exit:
return ret;
}
static DEVICE_ATTR_RW(log_buf_len);
static struct attribute *cosm_default_attrs[] = {
&dev_attr_family.attr,
&dev_attr_stepping.attr,
&dev_attr_state.attr,
&dev_attr_shutdown_status.attr,
&dev_attr_heartbeat_enable.attr,
&dev_attr_cmdline.attr,
&dev_attr_firmware.attr,
&dev_attr_ramdisk.attr,
&dev_attr_bootmode.attr,
&dev_attr_log_buf_addr.attr,
&dev_attr_log_buf_len.attr,
NULL
};
ATTRIBUTE_GROUPS(cosm_default);
void cosm_sysfs_init(struct cosm_device *cdev)
{
cdev->attr_group = cosm_default_groups;
}