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OpenCloudOS-Kernel/arch/i386/kernel/microcode.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 8.10 of Volume III, Intel Pentium 4 Manual,
* Order Number 245472 or free download from:
*
* http://developer.intel.com/design/pentium4/manuals/245472.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.
*/
//#define DEBUG /* pr_debug */
#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.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>
MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
MODULE_LICENSE("GPL");
#define MICROCODE_VERSION "1.14a"
#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
#define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */
#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
#define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
#define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
#define DWSIZE (sizeof (u32))
#define get_totalsize(mc) \
(((microcode_t *)mc)->hdr.totalsize ? \
((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
#define get_datasize(mc) \
(((microcode_t *)mc)->hdr.datasize ? \
((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
#define sigmatch(s1, s2, p1, p2) \
(((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
/* serialize access to the physical write to MSR 0x79 */
static DEFINE_SPINLOCK(microcode_update_lock);
/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
static DEFINE_MUTEX(microcode_mutex);
static struct ucode_cpu_info {
int valid;
unsigned int sig;
unsigned int pf;
unsigned int rev;
microcode_t *mc;
} ucode_cpu_info[NR_CPUS];
static void collect_cpu_info(int cpu_num)
{
struct cpuinfo_x86 *c = cpu_data + cpu_num;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
unsigned int val[2];
/* We should bind the task to the CPU */
BUG_ON(raw_smp_processor_id() != cpu_num);
uci->pf = uci->rev = 0;
uci->mc = NULL;
uci->valid = 1;
if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
cpu_has(c, X86_FEATURE_IA64)) {
printk(KERN_ERR "microcode: CPU%d not a capable Intel "
"processor\n", cpu_num);
uci->valid = 0;
return;
}
uci->sig = cpuid_eax(0x00000001);
if ((c->x86_model >= 5) || (c->x86 > 6)) {
/* get processor flags from MSR 0x17 */
rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
uci->pf = 1 << ((val[1] >> 18) & 7);
}
wrmsr(MSR_IA32_UCODE_REV, 0, 0);
/* see notes above for revision 1.07. Apparent chip bug */
sync_core();
/* get the current revision from MSR 0x8B */
rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
uci->sig, uci->pf, uci->rev);
}
static inline int microcode_update_match(int cpu_num,
microcode_header_t *mc_header, int sig, int pf)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
if (!sigmatch(sig, uci->sig, pf, uci->pf)
|| mc_header->rev <= uci->rev)
return 0;
return 1;
}
static int microcode_sanity_check(void *mc)
{
microcode_header_t *mc_header = mc;
struct extended_sigtable *ext_header = NULL;
struct extended_signature *ext_sig;
unsigned long total_size, data_size, ext_table_size;
int sum, orig_sum, ext_sigcount = 0, i;
total_size = get_totalsize(mc_header);
data_size = get_datasize(mc_header);
if (data_size + MC_HEADER_SIZE > total_size) {
printk(KERN_ERR "microcode: error! "
"Bad data size in microcode data file\n");
return -EINVAL;
}
if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
printk(KERN_ERR "microcode: error! "
"Unknown microcode update format\n");
return -EINVAL;
}
ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
if (ext_table_size) {
if ((ext_table_size < EXT_HEADER_SIZE)
|| ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
printk(KERN_ERR "microcode: error! "
"Small exttable size in microcode data file\n");
return -EINVAL;
}
ext_header = mc + MC_HEADER_SIZE + data_size;
if (ext_table_size != exttable_size(ext_header)) {
printk(KERN_ERR "microcode: error! "
"Bad exttable size in microcode data file\n");
return -EFAULT;
}
ext_sigcount = ext_header->count;
}
/* check extended table checksum */
if (ext_table_size) {
int ext_table_sum = 0;
int *ext_tablep = (int *)ext_header;
i = ext_table_size / DWSIZE;
while (i--)
ext_table_sum += ext_tablep[i];
if (ext_table_sum) {
printk(KERN_WARNING "microcode: aborting, "
"bad extended signature table checksum\n");
return -EINVAL;
}
}
/* calculate the checksum */
orig_sum = 0;
i = (MC_HEADER_SIZE + data_size) / DWSIZE;
while (i--)
orig_sum += ((int *)mc)[i];
if (orig_sum) {
printk(KERN_ERR "microcode: aborting, bad checksum\n");
return -EINVAL;
}
if (!ext_table_size)
return 0;
/* check extended signature checksum */
for (i = 0; i < ext_sigcount; i++) {
ext_sig = (struct extended_signature *)((void *)ext_header
+ EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i);
sum = orig_sum
- (mc_header->sig + mc_header->pf + mc_header->cksum)
+ (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
if (sum) {
printk(KERN_ERR "microcode: aborting, bad checksum\n");
return -EINVAL;
}
}
return 0;
}
/*
* return 0 - no update found
* return 1 - found update
* return < 0 - error
*/
static int get_maching_microcode(void *mc, int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
microcode_header_t *mc_header = mc;
struct extended_sigtable *ext_header;
unsigned long total_size = get_totalsize(mc_header);
int ext_sigcount, i;
struct extended_signature *ext_sig;
void *new_mc;
if (microcode_update_match(cpu, mc_header,
mc_header->sig, mc_header->pf))
goto find;
if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
return 0;
ext_header = (struct extended_sigtable *)(mc +
get_datasize(mc_header) + MC_HEADER_SIZE);
ext_sigcount = ext_header->count;
ext_sig = (struct extended_signature *)((void *)ext_header
+ EXT_HEADER_SIZE);
for (i = 0; i < ext_sigcount; i++) {
if (microcode_update_match(cpu, mc_header,
ext_sig->sig, ext_sig->pf))
goto find;
ext_sig++;
}
return 0;
find:
pr_debug("microcode: CPU %d found a matching microcode update with"
" version 0x%x (current=0x%x)\n", cpu, mc_header->rev,uci->rev);
new_mc = vmalloc(total_size);
if (!new_mc) {
printk(KERN_ERR "microcode: error! Can not allocate memory\n");
return -ENOMEM;
}
/* free previous update file */
vfree(uci->mc);
memcpy(new_mc, mc, total_size);
uci->mc = new_mc;
return 1;
}
static void apply_microcode(int cpu)
{
unsigned long flags;
unsigned int val[2];
int cpu_num = raw_smp_processor_id();
struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
/* We should bind the task to the CPU */
BUG_ON(cpu_num != cpu);
if (uci->mc == NULL)
return;
/* serialize access to the physical write to MSR 0x79 */
spin_lock_irqsave(&microcode_update_lock, flags);
/* write microcode via MSR 0x79 */
wrmsr(MSR_IA32_UCODE_WRITE,
(unsigned long) uci->mc->bits,
(unsigned long) uci->mc->bits >> 16 >> 16);
wrmsr(MSR_IA32_UCODE_REV, 0, 0);
/* see notes above for revision 1.07. Apparent chip bug */
sync_core();
/* get the current revision from MSR 0x8B */
rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
spin_unlock_irqrestore(&microcode_update_lock, flags);
if (val[1] != uci->mc->hdr.rev) {
printk(KERN_ERR "microcode: CPU%d updated from revision "
"0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]);
return;
}
pr_debug("microcode: CPU%d updated from revision "
"0x%x to 0x%x, date = %08x \n",
cpu_num, uci->rev, val[1], uci->mc->hdr.date);
uci->rev = val[1];
}
#ifdef CONFIG_MICROCODE_OLD_INTERFACE
static void __user *user_buffer; /* user area microcode data buffer */
static unsigned int user_buffer_size; /* it's size */
static long get_next_ucode(void **mc, long offset)
{
microcode_header_t mc_header;
unsigned long total_size;
/* No more data */
if (offset >= user_buffer_size)
return 0;
if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) {
printk(KERN_ERR "microcode: error! Can not read user data\n");
return -EFAULT;
}
total_size = get_totalsize(&mc_header);
if (offset + total_size > user_buffer_size) {
printk(KERN_ERR "microcode: error! Bad total size in microcode "
"data file\n");
return -EINVAL;
}
*mc = vmalloc(total_size);
if (!*mc)
return -ENOMEM;
if (copy_from_user(*mc, user_buffer + offset, total_size)) {
printk(KERN_ERR "microcode: error! Can not read user data\n");
vfree(*mc);
return -EFAULT;
}
return offset + total_size;
}
static int do_microcode_update (void)
{
long cursor = 0;
int error = 0;
void *new_mc = NULL;
int cpu;
cpumask_t old;
old = current->cpus_allowed;
while ((cursor = get_next_ucode(&new_mc, cursor)) > 0) {
error = microcode_sanity_check(new_mc);
if (error)
goto out;
/*
* It's possible the data file has multiple matching ucode,
* lets keep searching till the latest version
*/
for_each_online_cpu(cpu) {
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
if (!uci->valid)
continue;
set_cpus_allowed(current, cpumask_of_cpu(cpu));
error = get_maching_microcode(new_mc, cpu);
if (error < 0)
goto out;
if (error == 1)
apply_microcode(cpu);
}
vfree(new_mc);
}
out:
if (cursor > 0)
vfree(new_mc);
if (cursor < 0)
error = cursor;
set_cpus_allowed(current, old);
return error;
}
static int microcode_open (struct inode *unused1, struct file *unused2)
{
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;
}
lock_cpu_hotplug();
mutex_lock(&microcode_mutex);
user_buffer = (void __user *) buf;
user_buffer_size = (int) len;
ret = do_microcode_update();
if (!ret)
ret = (ssize_t)len;
mutex_unlock(&microcode_mutex);
unlock_cpu_hotplug();
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
static long get_next_ucode_from_buffer(void **mc, void *buf,
unsigned long size, long offset)
{
microcode_header_t *mc_header;
unsigned long total_size;
/* No more data */
if (offset >= size)
return 0;
mc_header = (microcode_header_t *)(buf + offset);
total_size = get_totalsize(mc_header);
if (offset + total_size > size) {
printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
return -EINVAL;
}
*mc = vmalloc(total_size);
if (!*mc) {
printk(KERN_ERR "microcode: error! Can not allocate memory\n");
return -ENOMEM;
}
memcpy(*mc, buf + offset, total_size);
return offset + total_size;
}
/* fake device for request_firmware */
static struct platform_device *microcode_pdev;
static int cpu_request_microcode(int cpu)
{
char name[30];
struct cpuinfo_x86 *c = cpu_data + cpu;
const struct firmware *firmware;
void *buf;
unsigned long size;
long offset = 0;
int error;
void *mc;
/* We should bind the task to the CPU */
BUG_ON(cpu != raw_smp_processor_id());
sprintf(name,"intel-ucode/%02x-%02x-%02x",
c->x86, c->x86_model, c->x86_mask);
error = request_firmware(&firmware, name, &microcode_pdev->dev);
if (error) {
pr_debug("ucode data file %s load failed\n", name);
return error;
}
buf = (void *)firmware->data;
size = firmware->size;
while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset))
> 0) {
error = microcode_sanity_check(mc);
if (error)
break;
error = get_maching_microcode(mc, cpu);
if (error < 0)
break;
/*
* It's possible the data file has multiple matching ucode,
* lets keep searching till the latest version
*/
if (error == 1) {
apply_microcode(cpu);
error = 0;
}
vfree(mc);
}
if (offset > 0)
vfree(mc);
if (offset < 0)
error = offset;
release_firmware(firmware);
return error;
}
static int apply_microcode_check_cpu(int cpu)
{
struct cpuinfo_x86 *c = cpu_data + cpu;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
cpumask_t old;
unsigned int val[2];
int err = 0;
/* Check if the microcode is available */
if (!uci->mc)
return 0;
old = current->cpus_allowed;
set_cpus_allowed(current, cpumask_of_cpu(cpu));
/* Check if the microcode we have in memory matches the CPU */
if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
cpu_has(c, X86_FEATURE_IA64) || uci->sig != cpuid_eax(0x00000001))
err = -EINVAL;
if (!err && ((c->x86_model >= 5) || (c->x86 > 6))) {
/* get processor flags from MSR 0x17 */
rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
if (uci->pf != (1 << ((val[1] >> 18) & 7)))
err = -EINVAL;
}
if (!err) {
wrmsr(MSR_IA32_UCODE_REV, 0, 0);
/* see notes above for revision 1.07. Apparent chip bug */
sync_core();
/* get the current revision from MSR 0x8B */
rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
if (uci->rev != val[1])
err = -EINVAL;
}
if (!err)
apply_microcode(cpu);
else
printk(KERN_ERR "microcode: Could not apply microcode to CPU%d:"
" sig=0x%x, pf=0x%x, rev=0x%x\n",
cpu, uci->sig, uci->pf, uci->rev);
set_cpus_allowed(current, old);
return err;
}
static void microcode_init_cpu(int cpu, int resume)
{
cpumask_t old;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
old = current->cpus_allowed;
set_cpus_allowed(current, cpumask_of_cpu(cpu));
mutex_lock(&microcode_mutex);
collect_cpu_info(cpu);
if (uci->valid && system_state == SYSTEM_RUNNING && !resume)
cpu_request_microcode(cpu);
mutex_unlock(&microcode_mutex);
set_cpus_allowed(current, old);
}
static void microcode_fini_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
mutex_lock(&microcode_mutex);
uci->valid = 0;
vfree(uci->mc);
uci->mc = NULL;
mutex_unlock(&microcode_mutex);
}
static ssize_t reload_store(struct sys_device *dev, 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;
old = current->cpus_allowed;
lock_cpu_hotplug();
set_cpus_allowed(current, cpumask_of_cpu(cpu));
mutex_lock(&microcode_mutex);
if (uci->valid)
err = cpu_request_microcode(cpu);
mutex_unlock(&microcode_mutex);
unlock_cpu_hotplug();
set_cpus_allowed(current, old);
}
if (err)
return err;
return sz;
}
static ssize_t version_show(struct sys_device *dev, char *buf)
{
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
return sprintf(buf, "0x%x\n", uci->rev);
}
static ssize_t pf_show(struct sys_device *dev, char *buf)
{
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
return sprintf(buf, "0x%x\n", uci->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 int __mc_sysdev_add(struct sys_device *sys_dev, int resume)
{
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, resume);
return 0;
}
static int mc_sysdev_add(struct sys_device *sys_dev)
{
return __mc_sysdev_add(sys_dev, 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;
pr_debug("Microcode:CPU %d resumed\n", cpu);
/* only CPU 0 will apply ucode here */
apply_microcode(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_UP_CANCELED_FROZEN:
/* The CPU refused to come up during a system resume */
microcode_fini_cpu(cpu);
break;
case CPU_ONLINE:
case CPU_DOWN_FAILED:
mc_sysdev_add(sys_dev);
break;
case CPU_ONLINE_FROZEN:
/* System-wide resume is in progress, try to apply microcode */
if (apply_microcode_check_cpu(cpu)) {
/* The application of microcode failed */
microcode_fini_cpu(cpu);
__mc_sysdev_add(sys_dev, 1);
break;
}
case CPU_DOWN_FAILED_FROZEN:
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:
mc_sysdev_remove(sys_dev);
break;
case CPU_DOWN_PREPARE_FROZEN:
/* Suspend is in progress, only remove the interface */
sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
break;
}
return NOTIFY_OK;
}
static struct notifier_block __cpuinitdata mc_cpu_notifier = {
.notifier_call = mc_cpu_callback,
};
static int __init microcode_init (void)
{
int error;
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);
}
lock_cpu_hotplug();
error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
unlock_cpu_hotplug();
if (error) {
microcode_dev_exit();
platform_device_unregister(microcode_pdev);
return error;
}
register_hotcpu_notifier(&mc_cpu_notifier);
printk(KERN_INFO
"IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@aivazian.fsnet.co.uk>\n");
return 0;
}
static void __exit microcode_exit (void)
{
microcode_dev_exit();
unregister_hotcpu_notifier(&mc_cpu_notifier);
lock_cpu_hotplug();
sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
unlock_cpu_hotplug();
platform_device_unregister(microcode_pdev);
}
module_init(microcode_init)
module_exit(microcode_exit)
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