diff options
Diffstat (limited to 'arch/i386/kernel/msr.c')
| -rw-r--r-- | arch/i386/kernel/msr.c | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/arch/i386/kernel/msr.c b/arch/i386/kernel/msr.c deleted file mode 100644 index 0c1069b8d63..00000000000 --- a/arch/i386/kernel/msr.c +++ /dev/null @@ -1,224 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2000 H. Peter Anvin - All Rights Reserved - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139, - * USA; either version 2 of the License, or (at your option) any later - * version; incorporated herein by reference. - * - * ----------------------------------------------------------------------- */ - -/* - * msr.c - * - * x86 MSR access device - * - * This device is accessed by lseek() to the appropriate register number - * and then read/write in chunks of 8 bytes. A larger size means multiple - * reads or writes of the same register. - * - * This driver uses /dev/cpu/%d/msr where %d is the minor number, and on - * an SMP box will direct the access to CPU %d. - */ - -#include <linux/module.h> - -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/fcntl.h> -#include <linux/init.h> -#include <linux/poll.h> -#include <linux/smp.h> -#include <linux/smp_lock.h> -#include <linux/major.h> -#include <linux/fs.h> -#include <linux/device.h> -#include <linux/cpu.h> -#include <linux/notifier.h> - -#include <asm/processor.h> -#include <asm/msr.h> -#include <asm/uaccess.h> -#include <asm/system.h> - -static struct class *msr_class; - -static loff_t msr_seek(struct file *file, loff_t offset, int orig) -{ - loff_t ret = -EINVAL; - - lock_kernel(); - switch (orig) { - case 0: - file->f_pos = offset; - ret = file->f_pos; - break; - case 1: - file->f_pos += offset; - ret = file->f_pos; - } - unlock_kernel(); - return ret; -} - -static ssize_t msr_read(struct file *file, char __user * buf, - size_t count, loff_t * ppos) -{ - u32 __user *tmp = (u32 __user *) buf; - u32 data[2]; - u32 reg = *ppos; - int cpu = iminor(file->f_path.dentry->d_inode); - int err; - - if (count % 8) - return -EINVAL; /* Invalid chunk size */ - - for (; count; count -= 8) { - err = rdmsr_safe_on_cpu(cpu, reg, &data[0], &data[1]); - if (err) - return -EIO; - if (copy_to_user(tmp, &data, 8)) - return -EFAULT; - tmp += 2; - } - - return ((char __user *)tmp) - buf; -} - -static ssize_t msr_write(struct file *file, const char __user *buf, - size_t count, loff_t *ppos) -{ - const u32 __user *tmp = (const u32 __user *)buf; - u32 data[2]; - u32 reg = *ppos; - int cpu = iminor(file->f_path.dentry->d_inode); - int err; - - if (count % 8) - return -EINVAL; /* Invalid chunk size */ - - for (; count; count -= 8) { - if (copy_from_user(&data, tmp, 8)) - return -EFAULT; - err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]); - if (err) - return -EIO; - tmp += 2; - } - - return ((char __user *)tmp) - buf; -} - -static int msr_open(struct inode *inode, struct file *file) -{ - unsigned int cpu = iminor(file->f_path.dentry->d_inode); - struct cpuinfo_x86 *c = &(cpu_data)[cpu]; - - if (cpu >= NR_CPUS || !cpu_online(cpu)) - return -ENXIO; /* No such CPU */ - if (!cpu_has(c, X86_FEATURE_MSR)) - return -EIO; /* MSR not supported */ - - return 0; -} - -/* - * File operations we support - */ -static const struct file_operations msr_fops = { - .owner = THIS_MODULE, - .llseek = msr_seek, - .read = msr_read, - .write = msr_write, - .open = msr_open, -}; - -static int msr_device_create(int i) -{ - int err = 0; - struct device *dev; - - dev = device_create(msr_class, NULL, MKDEV(MSR_MAJOR, i), "msr%d",i); - if (IS_ERR(dev)) - err = PTR_ERR(dev); - return err; -} - -static int msr_class_cpu_callback(struct notifier_block *nfb, - unsigned long action, void *hcpu) -{ - unsigned int cpu = (unsigned long)hcpu; - - switch (action) { - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - msr_device_create(cpu); - break; - case CPU_DEAD: - case CPU_DEAD_FROZEN: - device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu)); - break; - } - return NOTIFY_OK; -} - -static struct notifier_block __cpuinitdata msr_class_cpu_notifier = -{ - .notifier_call = msr_class_cpu_callback, -}; - -static int __init msr_init(void) -{ - int i, err = 0; - i = 0; - - if (register_chrdev(MSR_MAJOR, "cpu/msr", &msr_fops)) { - printk(KERN_ERR "msr: unable to get major %d for msr\n", - MSR_MAJOR); - err = -EBUSY; - goto out; - } - msr_class = class_create(THIS_MODULE, "msr"); - if (IS_ERR(msr_class)) { - err = PTR_ERR(msr_class); - goto out_chrdev; - } - for_each_online_cpu(i) { - err = msr_device_create(i); - if (err != 0) - goto out_class; - } - register_hotcpu_notifier(&msr_class_cpu_notifier); - - err = 0; - goto out; - -out_class: - i = 0; - for_each_online_cpu(i) - device_destroy(msr_class, MKDEV(MSR_MAJOR, i)); - class_destroy(msr_class); -out_chrdev: - unregister_chrdev(MSR_MAJOR, "cpu/msr"); -out: - return err; -} - -static void __exit msr_exit(void) -{ - int cpu = 0; - for_each_online_cpu(cpu) - device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu)); - class_destroy(msr_class); - unregister_chrdev(MSR_MAJOR, "cpu/msr"); - unregister_hotcpu_notifier(&msr_class_cpu_notifier); -} - -module_init(msr_init); -module_exit(msr_exit) - -MODULE_AUTHOR("H. Peter Anvin <hpa@zytor.com>"); -MODULE_DESCRIPTION("x86 generic MSR driver"); -MODULE_LICENSE("GPL"); |