diff options
Diffstat (limited to 'arch/x86/kernel/msr.c')
| -rw-r--r-- | arch/x86/kernel/msr.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c new file mode 100644 index 000000000000..0c1069b8d638 --- /dev/null +++ b/arch/x86/kernel/msr.c @@ -0,0 +1,224 @@ +/* ----------------------------------------------------------------------- * + * + * 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"); |