diff options
Diffstat (limited to 'arch/x86/kernel/microcode_core.c')
| -rw-r--r-- | arch/x86/kernel/microcode_core.c | 645 |
1 files changed, 0 insertions, 645 deletions
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c deleted file mode 100644 index 15c987698b0..00000000000 --- a/arch/x86/kernel/microcode_core.c +++ /dev/null @@ -1,645 +0,0 @@ -/* - * 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/Assets/PDF/manual/253668.pdf - * - * 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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/platform_device.h> -#include <linux/miscdevice.h> -#include <linux/capability.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/cpu.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/syscore_ops.h> - -#include <asm/microcode.h> -#include <asm/processor.h> -#include <asm/cpu_device_id.h> -#include <asm/perf_event.h> - -MODULE_DESCRIPTION("Microcode Update Driver"); -MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); -MODULE_LICENSE("GPL"); - -#define MICROCODE_VERSION "2.00" - -static struct microcode_ops *microcode_ops; - -/* - * Synchronization. - * - * All non cpu-hotplug-callback call sites use: - * - * - microcode_mutex to synchronize with each other; - * - get/put_online_cpus() to synchronize with - * the cpu-hotplug-callback call sites. - * - * We guarantee that only a single cpu is being - * updated at any particular moment of time. - */ -static DEFINE_MUTEX(microcode_mutex); - -struct ucode_cpu_info ucode_cpu_info[NR_CPUS]; -EXPORT_SYMBOL_GPL(ucode_cpu_info); - -/* - * Operations that are run on a target cpu: - */ - -struct cpu_info_ctx { - struct cpu_signature *cpu_sig; - int err; -}; - -static void collect_cpu_info_local(void *arg) -{ - struct cpu_info_ctx *ctx = arg; - - ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(), - ctx->cpu_sig); -} - -static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig) -{ - struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 }; - int ret; - - ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1); - if (!ret) - ret = ctx.err; - - return ret; -} - -static int collect_cpu_info(int cpu) -{ - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - int ret; - - memset(uci, 0, sizeof(*uci)); - - ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig); - if (!ret) - uci->valid = 1; - - return ret; -} - -struct apply_microcode_ctx { - int err; -}; - -static void apply_microcode_local(void *arg) -{ - struct apply_microcode_ctx *ctx = arg; - - ctx->err = microcode_ops->apply_microcode(smp_processor_id()); -} - -static int apply_microcode_on_target(int cpu) -{ - struct apply_microcode_ctx ctx = { .err = 0 }; - int ret; - - ret = smp_call_function_single(cpu, apply_microcode_local, &ctx, 1); - if (!ret) - ret = ctx.err; - - return ret; -} - -#ifdef CONFIG_MICROCODE_OLD_INTERFACE -static int do_microcode_update(const void __user *buf, size_t size) -{ - int error = 0; - int cpu; - - for_each_online_cpu(cpu) { - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - enum ucode_state ustate; - - if (!uci->valid) - continue; - - ustate = microcode_ops->request_microcode_user(cpu, buf, size); - if (ustate == UCODE_ERROR) { - error = -1; - break; - } else if (ustate == UCODE_OK) - apply_microcode_on_target(cpu); - } - - return error; -} - -static int microcode_open(struct inode *inode, struct file *file) -{ - return capable(CAP_SYS_RAWIO) ? nonseekable_open(inode, file) : -EPERM; -} - -static ssize_t microcode_write(struct file *file, const char __user *buf, - size_t len, loff_t *ppos) -{ - ssize_t ret = -EINVAL; - - if ((len >> PAGE_SHIFT) > totalram_pages) { - pr_err("too much data (max %ld pages)\n", totalram_pages); - return ret; - } - - get_online_cpus(); - mutex_lock(µcode_mutex); - - if (do_microcode_update(buf, len) == 0) - ret = (ssize_t)len; - - if (ret > 0) - perf_check_microcode(); - - mutex_unlock(µcode_mutex); - put_online_cpus(); - - return ret; -} - -static const struct file_operations microcode_fops = { - .owner = THIS_MODULE, - .write = microcode_write, - .open = microcode_open, - .llseek = no_llseek, -}; - -static struct miscdevice microcode_dev = { - .minor = MICROCODE_MINOR, - .name = "microcode", - .nodename = "cpu/microcode", - .fops = µcode_fops, -}; - -static int __init microcode_dev_init(void) -{ - int error; - - error = misc_register(µcode_dev); - if (error) { - pr_err("can't misc_register on minor=%d\n", MICROCODE_MINOR); - return error; - } - - return 0; -} - -static void __exit microcode_dev_exit(void) -{ - misc_deregister(µcode_dev); -} - -MODULE_ALIAS_MISCDEV(MICROCODE_MINOR); -MODULE_ALIAS("devname:cpu/microcode"); -#else -#define microcode_dev_init() 0 -#define microcode_dev_exit() do { } while (0) -#endif - -/* fake device for request_firmware */ -static struct platform_device *microcode_pdev; - -static int reload_for_cpu(int cpu) -{ - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - enum ucode_state ustate; - int err = 0; - - if (!uci->valid) - return err; - - ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev, true); - if (ustate == UCODE_OK) - apply_microcode_on_target(cpu); - else - if (ustate == UCODE_ERROR) - err = -EINVAL; - return err; -} - -static ssize_t reload_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t size) -{ - unsigned long val; - int cpu; - ssize_t ret = 0, tmp_ret; - - ret = kstrtoul(buf, 0, &val); - if (ret) - return ret; - - if (val != 1) - return size; - - get_online_cpus(); - mutex_lock(µcode_mutex); - for_each_online_cpu(cpu) { - tmp_ret = reload_for_cpu(cpu); - if (tmp_ret != 0) - pr_warn("Error reloading microcode on CPU %d\n", cpu); - - /* save retval of the first encountered reload error */ - if (!ret) - ret = tmp_ret; - } - if (!ret) - perf_check_microcode(); - mutex_unlock(µcode_mutex); - put_online_cpus(); - - if (!ret) - ret = size; - - return ret; -} - -static ssize_t version_show(struct device *dev, - struct device_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 device *dev, - struct device_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 DEVICE_ATTR(reload, 0200, NULL, reload_store); -static DEVICE_ATTR(version, 0400, version_show, NULL); -static DEVICE_ATTR(processor_flags, 0400, pf_show, NULL); - -static struct attribute *mc_default_attrs[] = { - &dev_attr_version.attr, - &dev_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) -{ - microcode_ops->microcode_fini_cpu(cpu); -} - -static enum ucode_state microcode_resume_cpu(int cpu) -{ - pr_debug("CPU%d updated upon resume\n", cpu); - - if (apply_microcode_on_target(cpu)) - return UCODE_ERROR; - - return UCODE_OK; -} - -static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw) -{ - enum ucode_state ustate; - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - - if (uci && uci->valid) - return UCODE_OK; - - if (collect_cpu_info(cpu)) - return UCODE_ERROR; - - /* --dimm. Trigger a delayed update? */ - if (system_state != SYSTEM_RUNNING) - return UCODE_NFOUND; - - ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev, - refresh_fw); - - if (ustate == UCODE_OK) { - pr_debug("CPU%d updated upon init\n", cpu); - apply_microcode_on_target(cpu); - } - - return ustate; -} - -static enum ucode_state microcode_update_cpu(int cpu) -{ - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - - if (uci->valid) - return microcode_resume_cpu(cpu); - - return microcode_init_cpu(cpu, false); -} - -static int mc_device_add(struct device *dev, struct subsys_interface *sif) -{ - int err, cpu = dev->id; - - if (!cpu_online(cpu)) - return 0; - - pr_debug("CPU%d added\n", cpu); - - err = sysfs_create_group(&dev->kobj, &mc_attr_group); - if (err) - return err; - - if (microcode_init_cpu(cpu, true) == UCODE_ERROR) - return -EINVAL; - - return err; -} - -static int mc_device_remove(struct device *dev, struct subsys_interface *sif) -{ - int cpu = dev->id; - - if (!cpu_online(cpu)) - return 0; - - pr_debug("CPU%d removed\n", cpu); - microcode_fini_cpu(cpu); - sysfs_remove_group(&dev->kobj, &mc_attr_group); - return 0; -} - -static struct subsys_interface mc_cpu_interface = { - .name = "microcode", - .subsys = &cpu_subsys, - .add_dev = mc_device_add, - .remove_dev = mc_device_remove, -}; - -/** - * mc_bp_resume - Update boot CPU microcode during resume. - */ -static void mc_bp_resume(void) -{ - int cpu = smp_processor_id(); - struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - - if (uci->valid && uci->mc) - microcode_ops->apply_microcode(cpu); -} - -static struct syscore_ops mc_syscore_ops = { - .resume = mc_bp_resume, -}; - -static int -mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) -{ - unsigned int cpu = (unsigned long)hcpu; - struct device *dev; - - dev = get_cpu_device(cpu); - - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_ONLINE: - microcode_update_cpu(cpu); - pr_debug("CPU%d added\n", cpu); - /* - * "break" is missing on purpose here because we want to fall - * through in order to create the sysfs group. - */ - - case CPU_DOWN_FAILED: - if (sysfs_create_group(&dev->kobj, &mc_attr_group)) - pr_err("Failed to create group for CPU%d\n", cpu); - break; - - case CPU_DOWN_PREPARE: - /* Suspend is in progress, only remove the interface */ - sysfs_remove_group(&dev->kobj, &mc_attr_group); - pr_debug("CPU%d removed\n", cpu); - break; - - /* - * case CPU_DEAD: - * - * When a CPU goes offline, don't free up or invalidate the copy of - * the microcode in kernel memory, so that we can reuse it when the - * CPU comes back online without unnecessarily requesting the userspace - * for it again. - */ - } - - /* The CPU refused to come up during a system resume */ - if (action == CPU_UP_CANCELED_FROZEN) - microcode_fini_cpu(cpu); - - return NOTIFY_OK; -} - -static struct notifier_block __refdata mc_cpu_notifier = { - .notifier_call = mc_cpu_callback, -}; - -#ifdef MODULE -/* Autoload on Intel and AMD systems */ -static const struct x86_cpu_id __initconst microcode_id[] = { -#ifdef CONFIG_MICROCODE_INTEL - { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, }, -#endif -#ifdef CONFIG_MICROCODE_AMD - { X86_VENDOR_AMD, X86_FAMILY_ANY, X86_MODEL_ANY, }, -#endif - {} -}; -MODULE_DEVICE_TABLE(x86cpu, microcode_id); -#endif - -static struct attribute *cpu_root_microcode_attrs[] = { - &dev_attr_reload.attr, - NULL -}; - -static struct attribute_group cpu_root_microcode_group = { - .name = "microcode", - .attrs = cpu_root_microcode_attrs, -}; - -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(); - else - pr_err("no support for this CPU vendor\n"); - - if (!microcode_ops) - return -ENODEV; - - microcode_pdev = platform_device_register_simple("microcode", -1, - NULL, 0); - if (IS_ERR(microcode_pdev)) - return PTR_ERR(microcode_pdev); - - get_online_cpus(); - mutex_lock(µcode_mutex); - - error = subsys_interface_register(&mc_cpu_interface); - if (!error) - perf_check_microcode(); - mutex_unlock(µcode_mutex); - put_online_cpus(); - - if (error) - goto out_pdev; - - error = sysfs_create_group(&cpu_subsys.dev_root->kobj, - &cpu_root_microcode_group); - - if (error) { - pr_err("Error creating microcode group!\n"); - goto out_driver; - } - - error = microcode_dev_init(); - if (error) - goto out_ucode_group; - - register_syscore_ops(&mc_syscore_ops); - register_hotcpu_notifier(&mc_cpu_notifier); - - pr_info("Microcode Update Driver: v" MICROCODE_VERSION - " <tigran@aivazian.fsnet.co.uk>, Peter Oruba\n"); - - return 0; - - out_ucode_group: - sysfs_remove_group(&cpu_subsys.dev_root->kobj, - &cpu_root_microcode_group); - - out_driver: - get_online_cpus(); - mutex_lock(µcode_mutex); - - subsys_interface_unregister(&mc_cpu_interface); - - mutex_unlock(µcode_mutex); - put_online_cpus(); - - out_pdev: - platform_device_unregister(microcode_pdev); - return error; - -} -module_init(microcode_init); - -static void __exit microcode_exit(void) -{ - struct cpuinfo_x86 *c = &cpu_data(0); - - microcode_dev_exit(); - - unregister_hotcpu_notifier(&mc_cpu_notifier); - unregister_syscore_ops(&mc_syscore_ops); - - sysfs_remove_group(&cpu_subsys.dev_root->kobj, - &cpu_root_microcode_group); - - get_online_cpus(); - mutex_lock(µcode_mutex); - - subsys_interface_unregister(&mc_cpu_interface); - - mutex_unlock(µcode_mutex); - put_online_cpus(); - - platform_device_unregister(microcode_pdev); - - microcode_ops = NULL; - - if (c->x86_vendor == X86_VENDOR_AMD) - exit_amd_microcode(); - - pr_info("Microcode Update Driver: v" MICROCODE_VERSION " removed.\n"); -} -module_exit(microcode_exit); |