450 lines
9.3 KiB
C
450 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2015 Intel Corporation.
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*
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* Intel MIC Coprocessor State Management (COSM) Driver
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*/
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#include <linux/slab.h>
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#include "cosm_main.h"
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/*
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* A state-to-string lookup table, for exposing a human readable state
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* via sysfs. Always keep in sync with enum cosm_states
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*/
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const char * const cosm_state_string[] = {
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[MIC_READY] = "ready",
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[MIC_BOOTING] = "booting",
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[MIC_ONLINE] = "online",
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[MIC_SHUTTING_DOWN] = "shutting_down",
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[MIC_RESETTING] = "resetting",
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[MIC_RESET_FAILED] = "reset_failed",
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};
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/*
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* A shutdown-status-to-string lookup table, for exposing a human
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* readable state via sysfs. Always keep in sync with enum cosm_shutdown_status
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*/
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const char * const cosm_shutdown_status_string[] = {
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[MIC_NOP] = "nop",
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[MIC_CRASHED] = "crashed",
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[MIC_HALTED] = "halted",
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[MIC_POWER_OFF] = "poweroff",
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[MIC_RESTART] = "restart",
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};
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void cosm_set_shutdown_status(struct cosm_device *cdev, u8 shutdown_status)
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{
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dev_dbg(&cdev->dev, "Shutdown Status %s -> %s\n",
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cosm_shutdown_status_string[cdev->shutdown_status],
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cosm_shutdown_status_string[shutdown_status]);
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cdev->shutdown_status = shutdown_status;
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}
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void cosm_set_state(struct cosm_device *cdev, u8 state)
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{
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dev_dbg(&cdev->dev, "State %s -> %s\n",
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cosm_state_string[cdev->state],
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cosm_state_string[state]);
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cdev->state = state;
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sysfs_notify_dirent(cdev->state_sysfs);
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}
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static ssize_t
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family_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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return cdev->hw_ops->family(cdev, buf);
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}
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static DEVICE_ATTR_RO(family);
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static ssize_t
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stepping_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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return cdev->hw_ops->stepping(cdev, buf);
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}
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static DEVICE_ATTR_RO(stepping);
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static ssize_t
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state_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev || cdev->state >= MIC_LAST)
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return -EINVAL;
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return scnprintf(buf, PAGE_SIZE, "%s\n",
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cosm_state_string[cdev->state]);
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}
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static ssize_t
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state_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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int rc;
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if (!cdev)
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return -EINVAL;
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if (sysfs_streq(buf, "boot")) {
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rc = cosm_start(cdev);
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goto done;
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}
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if (sysfs_streq(buf, "reset")) {
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rc = cosm_reset(cdev);
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goto done;
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}
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if (sysfs_streq(buf, "shutdown")) {
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rc = cosm_shutdown(cdev);
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goto done;
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}
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rc = -EINVAL;
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done:
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if (rc)
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count = rc;
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return count;
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}
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static DEVICE_ATTR_RW(state);
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static ssize_t shutdown_status_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev || cdev->shutdown_status >= MIC_STATUS_LAST)
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return -EINVAL;
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return scnprintf(buf, PAGE_SIZE, "%s\n",
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cosm_shutdown_status_string[cdev->shutdown_status]);
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}
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static DEVICE_ATTR_RO(shutdown_status);
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static ssize_t
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heartbeat_enable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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return scnprintf(buf, PAGE_SIZE, "%d\n", cdev->sysfs_heartbeat_enable);
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}
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static ssize_t
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heartbeat_enable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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int enable;
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int ret;
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if (!cdev)
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return -EINVAL;
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mutex_lock(&cdev->cosm_mutex);
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ret = kstrtoint(buf, 10, &enable);
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if (ret)
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goto unlock;
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cdev->sysfs_heartbeat_enable = enable;
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/* if state is not online, cdev->heartbeat_watchdog_enable is 0 */
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if (cdev->state == MIC_ONLINE)
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cdev->heartbeat_watchdog_enable = enable;
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ret = count;
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unlock:
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mutex_unlock(&cdev->cosm_mutex);
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return ret;
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}
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static DEVICE_ATTR_RW(heartbeat_enable);
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static ssize_t
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cmdline_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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char *cmdline;
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if (!cdev)
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return -EINVAL;
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cmdline = cdev->cmdline;
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if (cmdline)
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return scnprintf(buf, PAGE_SIZE, "%s\n", cmdline);
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return 0;
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}
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static ssize_t
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cmdline_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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mutex_lock(&cdev->cosm_mutex);
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kfree(cdev->cmdline);
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cdev->cmdline = kmalloc(count + 1, GFP_KERNEL);
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if (!cdev->cmdline) {
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count = -ENOMEM;
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goto unlock;
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}
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strncpy(cdev->cmdline, buf, count);
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if (cdev->cmdline[count - 1] == '\n')
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cdev->cmdline[count - 1] = '\0';
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else
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cdev->cmdline[count] = '\0';
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unlock:
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mutex_unlock(&cdev->cosm_mutex);
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return count;
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}
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static DEVICE_ATTR_RW(cmdline);
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static ssize_t
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firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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char *firmware;
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if (!cdev)
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return -EINVAL;
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firmware = cdev->firmware;
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if (firmware)
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return scnprintf(buf, PAGE_SIZE, "%s\n", firmware);
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return 0;
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}
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static ssize_t
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firmware_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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mutex_lock(&cdev->cosm_mutex);
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kfree(cdev->firmware);
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cdev->firmware = kmalloc(count + 1, GFP_KERNEL);
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if (!cdev->firmware) {
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count = -ENOMEM;
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goto unlock;
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}
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strncpy(cdev->firmware, buf, count);
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if (cdev->firmware[count - 1] == '\n')
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cdev->firmware[count - 1] = '\0';
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else
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cdev->firmware[count] = '\0';
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unlock:
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mutex_unlock(&cdev->cosm_mutex);
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return count;
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}
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static DEVICE_ATTR_RW(firmware);
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static ssize_t
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ramdisk_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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char *ramdisk;
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if (!cdev)
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return -EINVAL;
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ramdisk = cdev->ramdisk;
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if (ramdisk)
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return scnprintf(buf, PAGE_SIZE, "%s\n", ramdisk);
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return 0;
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}
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static ssize_t
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ramdisk_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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mutex_lock(&cdev->cosm_mutex);
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kfree(cdev->ramdisk);
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cdev->ramdisk = kmalloc(count + 1, GFP_KERNEL);
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if (!cdev->ramdisk) {
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count = -ENOMEM;
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goto unlock;
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}
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strncpy(cdev->ramdisk, buf, count);
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if (cdev->ramdisk[count - 1] == '\n')
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cdev->ramdisk[count - 1] = '\0';
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else
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cdev->ramdisk[count] = '\0';
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unlock:
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mutex_unlock(&cdev->cosm_mutex);
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return count;
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}
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static DEVICE_ATTR_RW(ramdisk);
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static ssize_t
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bootmode_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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char *bootmode;
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if (!cdev)
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return -EINVAL;
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bootmode = cdev->bootmode;
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if (bootmode)
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return scnprintf(buf, PAGE_SIZE, "%s\n", bootmode);
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return 0;
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}
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static ssize_t
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bootmode_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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if (!sysfs_streq(buf, "linux") && !sysfs_streq(buf, "flash"))
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return -EINVAL;
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mutex_lock(&cdev->cosm_mutex);
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kfree(cdev->bootmode);
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cdev->bootmode = kmalloc(count + 1, GFP_KERNEL);
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if (!cdev->bootmode) {
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count = -ENOMEM;
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goto unlock;
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}
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strncpy(cdev->bootmode, buf, count);
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if (cdev->bootmode[count - 1] == '\n')
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cdev->bootmode[count - 1] = '\0';
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else
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cdev->bootmode[count] = '\0';
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unlock:
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mutex_unlock(&cdev->cosm_mutex);
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return count;
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}
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static DEVICE_ATTR_RW(bootmode);
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static ssize_t
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log_buf_addr_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_addr);
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}
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static ssize_t
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log_buf_addr_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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int ret;
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unsigned long addr;
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if (!cdev)
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return -EINVAL;
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ret = kstrtoul(buf, 16, &addr);
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if (ret)
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goto exit;
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cdev->log_buf_addr = (void *)addr;
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ret = count;
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exit:
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return ret;
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}
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static DEVICE_ATTR_RW(log_buf_addr);
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static ssize_t
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log_buf_len_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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if (!cdev)
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return -EINVAL;
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return scnprintf(buf, PAGE_SIZE, "%p\n", cdev->log_buf_len);
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}
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static ssize_t
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log_buf_len_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct cosm_device *cdev = dev_get_drvdata(dev);
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int ret;
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unsigned long addr;
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if (!cdev)
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return -EINVAL;
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ret = kstrtoul(buf, 16, &addr);
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if (ret)
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goto exit;
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cdev->log_buf_len = (int *)addr;
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ret = count;
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exit:
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return ret;
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}
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static DEVICE_ATTR_RW(log_buf_len);
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static struct attribute *cosm_default_attrs[] = {
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&dev_attr_family.attr,
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&dev_attr_stepping.attr,
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&dev_attr_state.attr,
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&dev_attr_shutdown_status.attr,
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&dev_attr_heartbeat_enable.attr,
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&dev_attr_cmdline.attr,
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&dev_attr_firmware.attr,
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&dev_attr_ramdisk.attr,
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&dev_attr_bootmode.attr,
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&dev_attr_log_buf_addr.attr,
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&dev_attr_log_buf_len.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(cosm_default);
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void cosm_sysfs_init(struct cosm_device *cdev)
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{
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cdev->attr_group = cosm_default_groups;
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}
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