+++ /dev/null
-/*
- * 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 <xen/xen.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)
-{
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-
- microcode_ops->microcode_fini_cpu(cpu);
- uci->valid = 0;
-}
-
-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;
-
- 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 __cpuinit 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 (xen_domain())
- microcode_ops = init_xen_microcode();
- else 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);
projects / users / jedix / linux-maple.git / commitdiff