Messages in this thread Patch in this message | | | From | Marty McFadden <> | Subject | [PATCH 1/4] MSR: Prep for separating msr.c into three files | Date | Thu, 25 Feb 2016 16:02:56 -0800 |
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DEPENDENCY: Compilation depends upon next commit. This commit only does the rename of msr.c --> msr_entry.c. Separated in to two commits so that "git am" would work without complaint.
No functional change (yet). Just preparation for splitting the MSR kernel module into three separate implementation files:
1) msr_entry.c - Original msr driver and entry (now) 2) msr_whitelist.c - MSR Whitelist implementation (patch 2) 3) msr_batch.c - MSR Batch implementation (patch 3)
Signed-off-by: Marty McFadden <mcfadden8@llnl.gov> --- arch/x86/kernel/msr.c | 284 ------------------------------------------- arch/x86/kernel/msr_entry.c | 284 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 284 insertions(+), 284 deletions(-) delete mode 100644 arch/x86/kernel/msr.c create mode 100644 arch/x86/kernel/msr_entry.c
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c deleted file mode 100644 index 64f9616..0000000 --- a/arch/x86/kernel/msr.c +++ /dev/null @@ -1,284 +0,0 @@ -/* ----------------------------------------------------------------------- * - * - * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved - * Copyright 2009 Intel Corporation; author: H. Peter Anvin - * - * 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. - * - * ----------------------------------------------------------------------- */ - -/* - * 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. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#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/major.h> -#include <linux/fs.h> -#include <linux/device.h> -#include <linux/cpu.h> -#include <linux/notifier.h> -#include <linux/uaccess.h> -#include <linux/gfp.h> - -#include <asm/processor.h> -#include <asm/msr.h> - -static struct class *msr_class; - -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_inode(file)); - int err = 0; - ssize_t bytes = 0; - - 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) - break; - if (copy_to_user(tmp, &data, 8)) { - err = -EFAULT; - break; - } - tmp += 2; - bytes += 8; - } - - return bytes ? bytes : err; -} - -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_inode(file)); - int err = 0; - ssize_t bytes = 0; - - if (count % 8) - return -EINVAL; /* Invalid chunk size */ - - for (; count; count -= 8) { - if (copy_from_user(&data, tmp, 8)) { - err = -EFAULT; - break; - } - err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]); - if (err) - break; - tmp += 2; - bytes += 8; - } - - return bytes ? bytes : err; -} - -static long msr_ioctl(struct file *file, unsigned int ioc, unsigned long arg) -{ - u32 __user *uregs = (u32 __user *)arg; - u32 regs[8]; - int cpu = iminor(file_inode(file)); - int err; - - switch (ioc) { - case X86_IOC_RDMSR_REGS: - if (!(file->f_mode & FMODE_READ)) { - err = -EBADF; - break; - } - if (copy_from_user(®s, uregs, sizeof regs)) { - err = -EFAULT; - break; - } - err = rdmsr_safe_regs_on_cpu(cpu, regs); - if (err) - break; - if (copy_to_user(uregs, ®s, sizeof regs)) - err = -EFAULT; - break; - - case X86_IOC_WRMSR_REGS: - if (!(file->f_mode & FMODE_WRITE)) { - err = -EBADF; - break; - } - if (copy_from_user(®s, uregs, sizeof regs)) { - err = -EFAULT; - break; - } - err = wrmsr_safe_regs_on_cpu(cpu, regs); - if (err) - break; - if (copy_to_user(uregs, ®s, sizeof regs)) - err = -EFAULT; - break; - - default: - err = -ENOTTY; - break; - } - - return err; -} - -static int msr_open(struct inode *inode, struct file *file) -{ - unsigned int cpu = iminor(file_inode(file)); - struct cpuinfo_x86 *c; - - if (!capable(CAP_SYS_RAWIO)) - return -EPERM; - - if (cpu >= nr_cpu_ids || !cpu_online(cpu)) - return -ENXIO; /* No such CPU */ - - c = &cpu_data(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 = no_seek_end_llseek, - .read = msr_read, - .write = msr_write, - .open = msr_open, - .unlocked_ioctl = msr_ioctl, - .compat_ioctl = msr_ioctl, -}; - -static int msr_device_create(int cpu) -{ - struct device *dev; - - dev = device_create(msr_class, NULL, MKDEV(MSR_MAJOR, cpu), NULL, - "msr%d", cpu); - return PTR_ERR_OR_ZERO(dev); -} - -static void msr_device_destroy(int cpu) -{ - device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu)); -} - -static int msr_class_cpu_callback(struct notifier_block *nfb, - unsigned long action, void *hcpu) -{ - unsigned int cpu = (unsigned long)hcpu; - int err = 0; - - switch (action) { - case CPU_UP_PREPARE: - err = msr_device_create(cpu); - break; - case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: - case CPU_DEAD: - msr_device_destroy(cpu); - break; - } - return notifier_from_errno(err); -} - -static struct notifier_block __refdata msr_class_cpu_notifier = { - .notifier_call = msr_class_cpu_callback, -}; - -static char *msr_devnode(struct device *dev, umode_t *mode) -{ - return kasprintf(GFP_KERNEL, "cpu/%u/msr", MINOR(dev->devt)); -} - -static int __init msr_init(void) -{ - int i, err = 0; - i = 0; - - if (__register_chrdev(MSR_MAJOR, 0, NR_CPUS, "cpu/msr", &msr_fops)) { - pr_err("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; - } - msr_class->devnode = msr_devnode; - - cpu_notifier_register_begin(); - for_each_online_cpu(i) { - err = msr_device_create(i); - if (err != 0) - goto out_class; - } - __register_hotcpu_notifier(&msr_class_cpu_notifier); - cpu_notifier_register_done(); - - err = 0; - goto out; - -out_class: - i = 0; - for_each_online_cpu(i) - msr_device_destroy(i); - cpu_notifier_register_done(); - class_destroy(msr_class); -out_chrdev: - __unregister_chrdev(MSR_MAJOR, 0, NR_CPUS, "cpu/msr"); -out: - return err; -} - -static void __exit msr_exit(void) -{ - int cpu = 0; - - cpu_notifier_register_begin(); - for_each_online_cpu(cpu) - msr_device_destroy(cpu); - class_destroy(msr_class); - __unregister_chrdev(MSR_MAJOR, 0, NR_CPUS, "cpu/msr"); - __unregister_hotcpu_notifier(&msr_class_cpu_notifier); - cpu_notifier_register_done(); -} - -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"); diff --git a/arch/x86/kernel/msr_entry.c b/arch/x86/kernel/msr_entry.c new file mode 100644 index 0000000..64f9616 --- /dev/null +++ b/arch/x86/kernel/msr_entry.c @@ -0,0 +1,284 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved + * Copyright 2009 Intel Corporation; author: H. Peter Anvin + * + * 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. + * + * ----------------------------------------------------------------------- */ + +/* + * 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. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#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/major.h> +#include <linux/fs.h> +#include <linux/device.h> +#include <linux/cpu.h> +#include <linux/notifier.h> +#include <linux/uaccess.h> +#include <linux/gfp.h> + +#include <asm/processor.h> +#include <asm/msr.h> + +static struct class *msr_class; + +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_inode(file)); + int err = 0; + ssize_t bytes = 0; + + 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) + break; + if (copy_to_user(tmp, &data, 8)) { + err = -EFAULT; + break; + } + tmp += 2; + bytes += 8; + } + + return bytes ? bytes : err; +} + +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_inode(file)); + int err = 0; + ssize_t bytes = 0; + + if (count % 8) + return -EINVAL; /* Invalid chunk size */ + + for (; count; count -= 8) { + if (copy_from_user(&data, tmp, 8)) { + err = -EFAULT; + break; + } + err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]); + if (err) + break; + tmp += 2; + bytes += 8; + } + + return bytes ? bytes : err; +} + +static long msr_ioctl(struct file *file, unsigned int ioc, unsigned long arg) +{ + u32 __user *uregs = (u32 __user *)arg; + u32 regs[8]; + int cpu = iminor(file_inode(file)); + int err; + + switch (ioc) { + case X86_IOC_RDMSR_REGS: + if (!(file->f_mode & FMODE_READ)) { + err = -EBADF; + break; + } + if (copy_from_user(®s, uregs, sizeof regs)) { + err = -EFAULT; + break; + } + err = rdmsr_safe_regs_on_cpu(cpu, regs); + if (err) + break; + if (copy_to_user(uregs, ®s, sizeof regs)) + err = -EFAULT; + break; + + case X86_IOC_WRMSR_REGS: + if (!(file->f_mode & FMODE_WRITE)) { + err = -EBADF; + break; + } + if (copy_from_user(®s, uregs, sizeof regs)) { + err = -EFAULT; + break; + } + err = wrmsr_safe_regs_on_cpu(cpu, regs); + if (err) + break; + if (copy_to_user(uregs, ®s, sizeof regs)) + err = -EFAULT; + break; + + default: + err = -ENOTTY; + break; + } + + return err; +} + +static int msr_open(struct inode *inode, struct file *file) +{ + unsigned int cpu = iminor(file_inode(file)); + struct cpuinfo_x86 *c; + + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; + + if (cpu >= nr_cpu_ids || !cpu_online(cpu)) + return -ENXIO; /* No such CPU */ + + c = &cpu_data(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 = no_seek_end_llseek, + .read = msr_read, + .write = msr_write, + .open = msr_open, + .unlocked_ioctl = msr_ioctl, + .compat_ioctl = msr_ioctl, +}; + +static int msr_device_create(int cpu) +{ + struct device *dev; + + dev = device_create(msr_class, NULL, MKDEV(MSR_MAJOR, cpu), NULL, + "msr%d", cpu); + return PTR_ERR_OR_ZERO(dev); +} + +static void msr_device_destroy(int cpu) +{ + device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu)); +} + +static int msr_class_cpu_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long)hcpu; + int err = 0; + + switch (action) { + case CPU_UP_PREPARE: + err = msr_device_create(cpu); + break; + case CPU_UP_CANCELED: + case CPU_UP_CANCELED_FROZEN: + case CPU_DEAD: + msr_device_destroy(cpu); + break; + } + return notifier_from_errno(err); +} + +static struct notifier_block __refdata msr_class_cpu_notifier = { + .notifier_call = msr_class_cpu_callback, +}; + +static char *msr_devnode(struct device *dev, umode_t *mode) +{ + return kasprintf(GFP_KERNEL, "cpu/%u/msr", MINOR(dev->devt)); +} + +static int __init msr_init(void) +{ + int i, err = 0; + i = 0; + + if (__register_chrdev(MSR_MAJOR, 0, NR_CPUS, "cpu/msr", &msr_fops)) { + pr_err("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; + } + msr_class->devnode = msr_devnode; + + cpu_notifier_register_begin(); + for_each_online_cpu(i) { + err = msr_device_create(i); + if (err != 0) + goto out_class; + } + __register_hotcpu_notifier(&msr_class_cpu_notifier); + cpu_notifier_register_done(); + + err = 0; + goto out; + +out_class: + i = 0; + for_each_online_cpu(i) + msr_device_destroy(i); + cpu_notifier_register_done(); + class_destroy(msr_class); +out_chrdev: + __unregister_chrdev(MSR_MAJOR, 0, NR_CPUS, "cpu/msr"); +out: + return err; +} + +static void __exit msr_exit(void) +{ + int cpu = 0; + + cpu_notifier_register_begin(); + for_each_online_cpu(cpu) + msr_device_destroy(cpu); + class_destroy(msr_class); + __unregister_chrdev(MSR_MAJOR, 0, NR_CPUS, "cpu/msr"); + __unregister_hotcpu_notifier(&msr_class_cpu_notifier); + cpu_notifier_register_done(); +} + +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"); -- 1.7.1
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