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linux/arch/x86/kernel/microcode_core.c

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/*
* Intel CPU Microcode Update Driver for Linux
*
* Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
* 2006 Shaohua Li <shaohua.li@intel.com>
*
* This driver allows to upgrade microcode on Intel processors
* belonging to IA-32 family - PentiumPro, Pentium II,
* Pentium III, Xeon, Pentium 4, etc.
*
* Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture
* Software Developer's Manual
* Order Number 253668 or free download from:
*
* http://developer.intel.com/design/pentium4/manuals/253668.htm
*
* For more information, go to http://www.urbanmyth.org/microcode
*
* 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; either version
* 2 of the License, or (at your option) any later version.
*
* 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com>
* Initial release.
* 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com>
* Added read() support + cleanups.
* 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com>
* Added 'device trimming' support. open(O_WRONLY) zeroes
* and frees the saved copy of applied microcode.
* 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com>
* Made to use devfs (/dev/cpu/microcode) + cleanups.
* 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com>
* Added misc device support (now uses both devfs and misc).
* Added MICROCODE_IOCFREE ioctl to clear memory.
* 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com>
* Messages for error cases (non Intel & no suitable microcode).
* 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
* Removed ->release(). Removed exclusive open and status bitmap.
* Added microcode_rwsem to serialize read()/write()/ioctl().
* Removed global kernel lock usage.
* 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
* Write 0 to 0x8B msr and then cpuid before reading revision,
* so that it works even if there were no update done by the
* BIOS. Otherwise, reading from 0x8B gives junk (which happened
* to be 0 on my machine which is why it worked even when I
* disabled update by the BIOS)
* Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
* 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
* Tigran Aivazian <tigran@veritas.com>
* Intel Pentium 4 processor support and bugfixes.
* 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
* Bugfix for HT (Hyper-Threading) enabled processors
* whereby processor resources are shared by all logical processors
* in a single CPU package.
* 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
* Tigran Aivazian <tigran@veritas.com>,
* Serialize updates as required on HT processors due to
* speculative nature of implementation.
* 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
* Fix the panic when writing zero-length microcode chunk.
* 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
* Jun Nakajima <jun.nakajima@intel.com>
* Support for the microcode updates in the new format.
* 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
* Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
* because we no longer hold a copy of applied microcode
* in kernel memory.
* 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
* Fix sigmatch() macro to handle old CPUs with pf == 0.
* Thanks to Stuart Swales for pointing out this bug.
*/
#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/miscdevice.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/cpu.h>
#include <linux/firmware.h>
#include <linux/platform_device.h>
#include <asm/msr.h>
#include <asm/uaccess.h>
#include <asm/processor.h>
#include <asm/microcode.h>
MODULE_DESCRIPTION("Microcode Update Driver");
MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
MODULE_LICENSE("GPL");
#define MICROCODE_VERSION "2.00"
struct microcode_ops *microcode_ops;
/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
static DEFINE_MUTEX(microcode_mutex);
struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
EXPORT_SYMBOL_GPL(ucode_cpu_info);
#ifdef CONFIG_MICROCODE_OLD_INTERFACE
static int do_microcode_update(const void __user *buf, size_t size)
{
cpumask_t old;
int error = 0;
int cpu;
old = current->cpus_allowed;
for_each_online_cpu(cpu) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
if (!uci->valid)
continue;
set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
error = microcode_ops->request_microcode_user(cpu, buf, size);
if (error < 0)
goto out;
if (!error)
microcode_ops->apply_microcode(cpu);
}
out:
set_cpus_allowed_ptr(current, &old);
return error;
}
static int microcode_open(struct inode *unused1, struct file *unused2)
{
cycle_kernel_lock();
return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
}
static ssize_t microcode_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos)
{
ssize_t ret;
if ((len >> PAGE_SHIFT) > num_physpages) {
printk(KERN_ERR "microcode: too much data (max %ld pages)\n",
num_physpages);
return -EINVAL;
}
get_online_cpus();
mutex_lock(&microcode_mutex);
ret = do_microcode_update(buf, len);
if (!ret)
ret = (ssize_t)len;
mutex_unlock(&microcode_mutex);
put_online_cpus();
return ret;
}
static const struct file_operations microcode_fops = {
.owner = THIS_MODULE,
.write = microcode_write,
.open = microcode_open,
};
static struct miscdevice microcode_dev = {
.minor = MICROCODE_MINOR,
.name = "microcode",
.fops = &microcode_fops,
};
static int __init microcode_dev_init(void)
{
int error;
error = misc_register(&microcode_dev);
if (error) {
printk(KERN_ERR
"microcode: can't misc_register on minor=%d\n",
MICROCODE_MINOR);
return error;
}
return 0;
}
static void microcode_dev_exit(void)
{
misc_deregister(&microcode_dev);
}
MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
#else
#define microcode_dev_init() 0
#define microcode_dev_exit() do { } while (0)
#endif
/* fake device for request_firmware */
struct platform_device *microcode_pdev;
static ssize_t reload_store(struct sys_device *dev,
struct sysdev_attribute *attr,
const char *buf, size_t sz)
{
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
char *end;
unsigned long val = simple_strtoul(buf, &end, 0);
int err = 0;
int cpu = dev->id;
if (end == buf)
return -EINVAL;
if (val == 1) {
cpumask_t old = current->cpus_allowed;
get_online_cpus();
if (cpu_online(cpu)) {
set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
mutex_lock(&microcode_mutex);
if (uci->valid) {
err = microcode_ops->request_microcode_fw(cpu,
&microcode_pdev->dev);
if (!err)
microcode_ops->apply_microcode(cpu);
}
mutex_unlock(&microcode_mutex);
set_cpus_allowed_ptr(current, &old);
}
put_online_cpus();
}
if (err)
return err;
return sz;
}
static ssize_t version_show(struct sys_device *dev,
struct sysdev_attribute *attr, char *buf)
{
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
return sprintf(buf, "0x%x\n", uci->cpu_sig.rev);
}
static ssize_t pf_show(struct sys_device *dev,
struct sysdev_attribute *attr, char *buf)
{
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
}
static SYSDEV_ATTR(reload, 0200, NULL, reload_store);
static SYSDEV_ATTR(version, 0400, version_show, NULL);
static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL);
static struct attribute *mc_default_attrs[] = {
&attr_reload.attr,
&attr_version.attr,
&attr_processor_flags.attr,
NULL
};
static struct attribute_group mc_attr_group = {
.attrs = mc_default_attrs,
.name = "microcode",
};
static void microcode_fini_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
mutex_lock(&microcode_mutex);
microcode_ops->microcode_fini_cpu(cpu);
uci->valid = 0;
mutex_unlock(&microcode_mutex);
}
static void collect_cpu_info(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
memset(uci, 0, sizeof(*uci));
if (!microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig))
uci->valid = 1;
}
static int microcode_resume_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
struct cpu_signature nsig;
pr_debug("microcode: CPU%d resumed\n", cpu);
if (!uci->mc)
return 1;
/*
* Let's verify that the 'cached' ucode does belong
* to this cpu (a bit of paranoia):
*/
if (microcode_ops->collect_cpu_info(cpu, &nsig)) {
microcode_fini_cpu(cpu);
return -1;
}
if (memcmp(&nsig, &uci->cpu_sig, sizeof(nsig))) {
microcode_fini_cpu(cpu);
/* Should we look for a new ucode here? */
return 1;
}
return 0;
}
void microcode_update_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
int err = 0;
/*
* Check if the system resume is in progress (uci->valid != NULL),
* otherwise just request a firmware:
*/
if (uci->valid) {
err = microcode_resume_cpu(cpu);
} else {
collect_cpu_info(cpu);
if (uci->valid && system_state == SYSTEM_RUNNING)
err = microcode_ops->request_microcode_fw(cpu,
&microcode_pdev->dev);
}
if (!err)
microcode_ops->apply_microcode(cpu);
}
static void microcode_init_cpu(int cpu)
{
cpumask_t old = current->cpus_allowed;
set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
/* We should bind the task to the CPU */
BUG_ON(raw_smp_processor_id() != cpu);
mutex_lock(&microcode_mutex);
microcode_update_cpu(cpu);
mutex_unlock(&microcode_mutex);
set_cpus_allowed_ptr(current, &old);
}
static int mc_sysdev_add(struct sys_device *sys_dev)
{
int err, cpu = sys_dev->id;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
if (!cpu_online(cpu))
return 0;
pr_debug("microcode: CPU%d added\n", cpu);
memset(uci, 0, sizeof(*uci));
err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
if (err)
return err;
microcode_init_cpu(cpu);
return 0;
}
static int mc_sysdev_remove(struct sys_device *sys_dev)
{
int cpu = sys_dev->id;
if (!cpu_online(cpu))
return 0;
pr_debug("microcode: CPU%d removed\n", cpu);
microcode_fini_cpu(cpu);
sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
return 0;
}
static int mc_sysdev_resume(struct sys_device *dev)
{
int cpu = dev->id;
if (!cpu_online(cpu))
return 0;
/* only CPU 0 will apply ucode here */
microcode_update_cpu(0);
return 0;
}
static struct sysdev_driver mc_sysdev_driver = {
.add = mc_sysdev_add,
.remove = mc_sysdev_remove,
.resume = mc_sysdev_resume,
};
static __cpuinit int
mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
struct sys_device *sys_dev;
sys_dev = get_cpu_sysdev(cpu);
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
microcode_init_cpu(cpu);
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
pr_debug("microcode: CPU%d added\n", cpu);
if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
printk(KERN_ERR "microcode: Failed to create the sysfs "
"group for CPU%d\n", cpu);
break;
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
/* Suspend is in progress, only remove the interface */
sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
pr_debug("microcode: CPU%d removed\n", cpu);
break;
case CPU_DEAD:
case CPU_UP_CANCELED_FROZEN:
/* The CPU refused to come up during a system resume */
microcode_fini_cpu(cpu);
break;
}
return NOTIFY_OK;
}
static struct notifier_block __refdata mc_cpu_notifier = {
.notifier_call = mc_cpu_callback,
};
static int __init microcode_init(void)
{
struct cpuinfo_x86 *c = &cpu_data(0);
int error;
if (c->x86_vendor == X86_VENDOR_INTEL)
microcode_ops = init_intel_microcode();
else if (c->x86_vendor == X86_VENDOR_AMD)
microcode_ops = init_amd_microcode();
if (!microcode_ops) {
printk(KERN_ERR "microcode: no support for this CPU vendor\n");
return -ENODEV;
}
error = microcode_dev_init();
if (error)
return error;
microcode_pdev = platform_device_register_simple("microcode", -1,
NULL, 0);
if (IS_ERR(microcode_pdev)) {
microcode_dev_exit();
return PTR_ERR(microcode_pdev);
}
get_online_cpus();
error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
put_online_cpus();
if (error) {
microcode_dev_exit();
platform_device_unregister(microcode_pdev);
return error;
}
register_hotcpu_notifier(&mc_cpu_notifier);
printk(KERN_INFO
"Microcode Update Driver: v" MICROCODE_VERSION
" <tigran@aivazian.fsnet.co.uk>,"
" Peter Oruba\n");
return 0;
}
static void __exit microcode_exit(void)
{
microcode_dev_exit();
unregister_hotcpu_notifier(&mc_cpu_notifier);
get_online_cpus();
sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
put_online_cpus();
platform_device_unregister(microcode_pdev);
microcode_ops = NULL;
printk(KERN_INFO
"Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
}
module_init(microcode_init);
module_exit(microcode_exit);
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