OpenCloudOS-Kernel/drivers/misc/mic/host/mic_sysfs.c

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/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2013 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 Host driver.
*
*/
#include <linux/pci.h>
#include <linux/mic_common.h>
#include "../common/mic_dev.h"
#include "mic_device.h"
/*
* A state-to-string lookup table, for exposing a human readable state
* via sysfs. Always keep in sync with enum mic_states
*/
static const char * const mic_state_string[] = {
[MIC_OFFLINE] = "offline",
[MIC_ONLINE] = "online",
[MIC_SHUTTING_DOWN] = "shutting_down",
[MIC_RESET_FAILED] = "reset_failed",
misc: mic: Enable OSPM suspend and resume support. This patch enables support for OSPM suspend and resume in the MIC driver. During a host suspend event, the driver performs an orderly shutdown of the cards if they are online. Upon resume, any cards that were previously online before suspend are rebooted. The driver performs an orderly shutdown of the card primarily to ensure that applications in the card are terminated and mounted devices are safely un-mounted before the card is powered down in the event of an OSPM suspend. The driver makes use of the MIC daemon to accomplish OSPM suspend and resume. The driver registers a PM notifier per MIC device. The devices get notified synchronously during PM_SUSPEND_PREPARE and PM_POST_SUSPEND phases. During the PM_SUSPEND_PREPARE phase, the driver performs one of the following three tasks. 1) If the card is 'offline', the driver sets the card to a 'suspended' state and returns. 2) If the card is 'online', the driver initiates card shutdown by setting the card state to suspending. This notifies the MIC daemon which invokes shutdown and sets card state to 'suspended'. The driver returns after the shutdown is complete. 3) If the card is already being shutdown, possibly by a host user space application, the driver sets the card state to 'suspended' and returns after the shutdown is complete. During the PM_POST_SUSPEND phase, the driver simply notifies the daemon and returns. The daemon boots those cards that were previously online during the suspend phase. Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Harshavardhan R Kharche <harshavardhan.r.kharche@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-04 09:06:23 +08:00
[MIC_SUSPENDING] = "suspending",
[MIC_SUSPENDED] = "suspended",
};
/*
* A shutdown-status-to-string lookup table, for exposing a human
* readable state via sysfs. Always keep in sync with enum mic_shutdown_status
*/
static const char * const mic_shutdown_status_string[] = {
[MIC_NOP] = "nop",
[MIC_CRASHED] = "crashed",
[MIC_HALTED] = "halted",
[MIC_POWER_OFF] = "poweroff",
[MIC_RESTART] = "restart",
};
void mic_set_shutdown_status(struct mic_device *mdev, u8 shutdown_status)
{
dev_dbg(mdev->sdev->parent, "Shutdown Status %s -> %s\n",
mic_shutdown_status_string[mdev->shutdown_status],
mic_shutdown_status_string[shutdown_status]);
mdev->shutdown_status = shutdown_status;
}
void mic_set_state(struct mic_device *mdev, u8 state)
{
dev_dbg(mdev->sdev->parent, "State %s -> %s\n",
mic_state_string[mdev->state],
mic_state_string[state]);
mdev->state = state;
sysfs_notify_dirent(mdev->state_sysfs);
}
static ssize_t
family_show(struct device *dev, struct device_attribute *attr, char *buf)
{
static const char x100[] = "x100";
static const char unknown[] = "Unknown";
const char *card = NULL;
struct mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
switch (mdev->family) {
case MIC_FAMILY_X100:
card = x100;
break;
default:
card = unknown;
break;
}
return scnprintf(buf, PAGE_SIZE, "%s\n", card);
}
static DEVICE_ATTR_RO(family);
static ssize_t
stepping_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
char *string = "??";
if (!mdev)
return -EINVAL;
switch (mdev->stepping) {
case MIC_A0_STEP:
string = "A0";
break;
case MIC_B0_STEP:
string = "B0";
break;
case MIC_B1_STEP:
string = "B1";
break;
case MIC_C0_STEP:
string = "C0";
break;
default:
break;
}
return scnprintf(buf, PAGE_SIZE, "%s\n", string);
}
static DEVICE_ATTR_RO(stepping);
static ssize_t
state_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev || mdev->state >= MIC_LAST)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%s\n",
mic_state_string[mdev->state]);
}
static ssize_t
state_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int rc = 0;
struct mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
if (sysfs_streq(buf, "boot")) {
rc = mic_start(mdev, buf);
if (rc) {
dev_err(mdev->sdev->parent,
"mic_boot failed rc %d\n", rc);
count = rc;
}
goto done;
}
if (sysfs_streq(buf, "reset")) {
schedule_work(&mdev->reset_trigger_work);
goto done;
}
if (sysfs_streq(buf, "shutdown")) {
mic_shutdown(mdev);
goto done;
}
misc: mic: Enable OSPM suspend and resume support. This patch enables support for OSPM suspend and resume in the MIC driver. During a host suspend event, the driver performs an orderly shutdown of the cards if they are online. Upon resume, any cards that were previously online before suspend are rebooted. The driver performs an orderly shutdown of the card primarily to ensure that applications in the card are terminated and mounted devices are safely un-mounted before the card is powered down in the event of an OSPM suspend. The driver makes use of the MIC daemon to accomplish OSPM suspend and resume. The driver registers a PM notifier per MIC device. The devices get notified synchronously during PM_SUSPEND_PREPARE and PM_POST_SUSPEND phases. During the PM_SUSPEND_PREPARE phase, the driver performs one of the following three tasks. 1) If the card is 'offline', the driver sets the card to a 'suspended' state and returns. 2) If the card is 'online', the driver initiates card shutdown by setting the card state to suspending. This notifies the MIC daemon which invokes shutdown and sets card state to 'suspended'. The driver returns after the shutdown is complete. 3) If the card is already being shutdown, possibly by a host user space application, the driver sets the card state to 'suspended' and returns after the shutdown is complete. During the PM_POST_SUSPEND phase, the driver simply notifies the daemon and returns. The daemon boots those cards that were previously online during the suspend phase. Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Harshavardhan R Kharche <harshavardhan.r.kharche@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-10-04 09:06:23 +08:00
if (sysfs_streq(buf, "suspend")) {
mic_suspend(mdev);
goto done;
}
count = -EINVAL;
done:
return count;
}
static DEVICE_ATTR_RW(state);
static ssize_t shutdown_status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev || mdev->shutdown_status >= MIC_STATUS_LAST)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%s\n",
mic_shutdown_status_string[mdev->shutdown_status]);
}
static DEVICE_ATTR_RO(shutdown_status);
static ssize_t
cmdline_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
char *cmdline;
if (!mdev)
return -EINVAL;
cmdline = mdev->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 mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
mutex_lock(&mdev->mic_mutex);
kfree(mdev->cmdline);
mdev->cmdline = kmalloc(count + 1, GFP_KERNEL);
if (!mdev->cmdline) {
count = -ENOMEM;
goto unlock;
}
strncpy(mdev->cmdline, buf, count);
if (mdev->cmdline[count - 1] == '\n')
mdev->cmdline[count - 1] = '\0';
else
mdev->cmdline[count] = '\0';
unlock:
mutex_unlock(&mdev->mic_mutex);
return count;
}
static DEVICE_ATTR_RW(cmdline);
static ssize_t
firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
char *firmware;
if (!mdev)
return -EINVAL;
firmware = mdev->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 mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
mutex_lock(&mdev->mic_mutex);
kfree(mdev->firmware);
mdev->firmware = kmalloc(count + 1, GFP_KERNEL);
if (!mdev->firmware) {
count = -ENOMEM;
goto unlock;
}
strncpy(mdev->firmware, buf, count);
if (mdev->firmware[count - 1] == '\n')
mdev->firmware[count - 1] = '\0';
else
mdev->firmware[count] = '\0';
unlock:
mutex_unlock(&mdev->mic_mutex);
return count;
}
static DEVICE_ATTR_RW(firmware);
static ssize_t
ramdisk_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
char *ramdisk;
if (!mdev)
return -EINVAL;
ramdisk = mdev->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 mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
mutex_lock(&mdev->mic_mutex);
kfree(mdev->ramdisk);
mdev->ramdisk = kmalloc(count + 1, GFP_KERNEL);
if (!mdev->ramdisk) {
count = -ENOMEM;
goto unlock;
}
strncpy(mdev->ramdisk, buf, count);
if (mdev->ramdisk[count - 1] == '\n')
mdev->ramdisk[count - 1] = '\0';
else
mdev->ramdisk[count] = '\0';
unlock:
mutex_unlock(&mdev->mic_mutex);
return count;
}
static DEVICE_ATTR_RW(ramdisk);
static ssize_t
bootmode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
char *bootmode;
if (!mdev)
return -EINVAL;
bootmode = mdev->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 mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
if (!sysfs_streq(buf, "linux") && !sysfs_streq(buf, "elf"))
return -EINVAL;
mutex_lock(&mdev->mic_mutex);
kfree(mdev->bootmode);
mdev->bootmode = kmalloc(count + 1, GFP_KERNEL);
if (!mdev->bootmode) {
count = -ENOMEM;
goto unlock;
}
strncpy(mdev->bootmode, buf, count);
if (mdev->bootmode[count - 1] == '\n')
mdev->bootmode[count - 1] = '\0';
else
mdev->bootmode[count] = '\0';
unlock:
mutex_unlock(&mdev->mic_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 mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%p\n", mdev->log_buf_addr);
}
static ssize_t
log_buf_addr_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
int ret;
unsigned long addr;
if (!mdev)
return -EINVAL;
ret = kstrtoul(buf, 16, &addr);
if (ret)
goto exit;
mdev->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 mic_device *mdev = dev_get_drvdata(dev->parent);
if (!mdev)
return -EINVAL;
return scnprintf(buf, PAGE_SIZE, "%p\n", mdev->log_buf_len);
}
static ssize_t
log_buf_len_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct mic_device *mdev = dev_get_drvdata(dev->parent);
int ret;
unsigned long addr;
if (!mdev)
return -EINVAL;
ret = kstrtoul(buf, 16, &addr);
if (ret)
goto exit;
mdev->log_buf_len = (int *)addr;
ret = count;
exit:
return ret;
}
static DEVICE_ATTR_RW(log_buf_len);
static struct attribute *mic_default_attrs[] = {
&dev_attr_family.attr,
&dev_attr_stepping.attr,
&dev_attr_state.attr,
&dev_attr_shutdown_status.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(mic_default);
void mic_sysfs_init(struct mic_device *mdev)
{
mdev->attr_group = mic_default_groups;
}