linux_kernel/drivers/misc/mic/host/mic_sysfs.c

/*
 * 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",
	[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;
	}

	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;
}