3 files changed, 153 insertions, 3 deletions

diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 0cbeb26ac3fb..3fd2f256f2be 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -401,6 +401,7 @@ config X86_REBOOTFIXUPS
 
 config MICROCODE
         tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
+        select FW_LOADER
         ---help---
           If you say Y here and also to "/dev file system support" in the
           'File systems' section, you will be able to update the microcode on
diff --git a/arch/i386/kernel/microcode.c b/arch/i386/kernel/microcode.c
index f8f1ec5f26c1..467901ebb992 100644
--- a/arch/i386/kernel/microcode.c
+++ b/arch/i386/kernel/microcode.c
@@ -219,7 +219,7 @@ static int microcode_sanity_check(void *mc)
         /* check extended table checksum */
         if (ext_table_size) {
                 int ext_table_sum = 0;
-                int * ext_tablep = (int *)ext_header;
+                int *ext_tablep = (int *)ext_header;
 
                 i = ext_table_size / DWSIZE;
                 while (i--)
@@ -386,7 +386,7 @@ static int do_microcode_update (void)
 {
         long cursor = 0;
         int error = 0;
-        void * new_mc;
+        void *new_mc;
         int cpu;
         cpumask_t old;
 
@@ -531,7 +531,7 @@ static int cpu_request_microcode(int cpu)
         char name[30];
         struct cpuinfo_x86 *c = cpu_data + cpu;
         const struct firmware *firmware;
-        void * buf;
+        void *buf;
         unsigned long size;
         long offset = 0;
         int error;
@@ -602,6 +602,136 @@ static void microcode_fini_cpu(int cpu)
         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 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));
+        sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
+
+        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;
+        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,
+};
+
+#ifdef CONFIG_HOTPLUG_CPU
+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_DOWN_FAILED:
+                mc_sysdev_add(sys_dev);
+                break;
+        case CPU_DOWN_PREPARE:
+                mc_sysdev_remove(sys_dev);
+                break;
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block mc_cpu_notifier = {
+        .notifier_call = mc_cpu_callback,
+};
+#endif
+
 static int __init microcode_init (void)
 {
         int error;
@@ -616,6 +746,17 @@ static int __init microcode_init (void)
                 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@veritas.com>\n");
         return 0;
@@ -624,6 +765,13 @@ static int __init microcode_init (void)
 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);
 }
 
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index ab4cbcb9e3b3..32ae1378f35c 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -171,6 +171,7 @@ config X86_GOOD_APIC
 
 config MICROCODE
         tristate "/dev/cpu/microcode - Intel CPU microcode support"
+        select FW_LOADER
         ---help---
           If you say Y here the 'File systems' section, you will be
           able to update the microcode on Intel processors. You will