1 files changed, 463 insertions, 0 deletions

diff --git a/arch/x86/kernel/microcode.c b/arch/x86/kernel/microcode.c
new file mode 100644
index 000000000000..c1047d7f7ede
--- /dev/null
+++ b/arch/x86/kernel/microcode.c
@@ -0,0 +1,463 @@
+/*
+ *      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.
+ */
+
+//#define DEBUG /* pr_debug */
+#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       "1.14a"
+
+/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
+DEFINE_MUTEX(microcode_mutex);
+
+struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
+
+extern long get_next_ucode(void **mc, long offset);
+extern int microcode_sanity_check(void *mc);
+extern int get_matching_microcode(void *mc, int cpu);
+extern void collect_cpu_info(int cpu_num);
+extern int cpu_request_microcode(int cpu);
+extern void microcode_fini_cpu(int cpu);
+extern void apply_microcode(int cpu);
+extern int apply_microcode_check_cpu(int cpu);
+
+#ifdef CONFIG_MICROCODE_OLD_INTERFACE
+void __user *user_buffer;       /* user area microcode data buffer */
+unsigned int user_buffer_size;  /* it's size */
+
+static int do_microcode_update (void)
+{
+        long cursor = 0;
+        int error = 0;
+        void *new_mc = NULL;
+        int cpu;
+        cpumask_t old;
+        cpumask_of_cpu_ptr_declare(newmask);
+
+        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;
+                        cpumask_of_cpu_ptr_next(newmask, cpu);
+                        set_cpus_allowed_ptr(current, newmask);
+                        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_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);
+
+        user_buffer = (void __user *) buf;
+        user_buffer_size = (int) len;
+
+        ret = do_microcode_update();
+        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 void microcode_init_cpu(int cpu, int resume)
+{
+        cpumask_t old;
+        cpumask_of_cpu_ptr(newmask, cpu);
+        struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+        old = current->cpus_allowed;
+
+        set_cpus_allowed_ptr(current, newmask);
+        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_ptr(current, &old);
+}
+
+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;
+                cpumask_of_cpu_ptr(newmask, cpu);
+
+                old = current->cpus_allowed;
+
+                get_online_cpus();
+                set_cpus_allowed_ptr(current, newmask);
+
+                mutex_lock(&microcode_mutex);
+                if (uci->valid)
+                        err = cpu_request_microcode(cpu);
+                mutex_unlock(&microcode_mutex);
+                put_online_cpus();
+                set_cpus_allowed_ptr(current, &old);
+        }
+        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->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->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 __refdata mc_cpu_notifier = {
+        .notifier_call = mc_cpu_callback,
+};
+
+static int __init microcode_init (void)
+{
+        int error;
+
+        printk(KERN_INFO
+                "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@aivazian.fsnet.co.uk>\n");
+
+        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);
+        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);
+}
+
+module_init(microcode_init)
+module_exit(microcode_exit)