2008-07-29 00:44:17 +08:00
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/*
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2015-05-11 16:15:47 +08:00
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* CPU Microcode Update Driver for Linux
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2008-07-29 00:44:17 +08:00
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*
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2015-05-11 16:15:47 +08:00
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* Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
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* 2006 Shaohua Li <shaohua.li@intel.com>
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* 2013-2015 Borislav Petkov <bp@alien8.de>
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2008-07-29 00:44:17 +08:00
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*
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2015-10-20 17:54:45 +08:00
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* X86 CPU microcode early update for Linux:
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*
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* Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
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* H Peter Anvin" <hpa@zytor.com>
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* (C) 2015 Borislav Petkov <bp@alien8.de>
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*
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2015-05-11 16:15:47 +08:00
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* This driver allows to upgrade microcode on x86 processors.
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2008-07-29 00:44:17 +08:00
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*
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2015-05-11 16:15:47 +08:00
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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2008-07-29 00:44:17 +08:00
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*/
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2009-12-09 14:30:50 +08:00
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2015-10-20 17:54:46 +08:00
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#define pr_fmt(fmt) "microcode: " fmt
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2009-12-09 14:30:50 +08:00
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2009-03-11 18:19:46 +08:00
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#include <linux/platform_device.h>
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2015-10-20 17:54:45 +08:00
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#include <linux/syscore_ops.h>
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2009-03-11 18:19:46 +08:00
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#include <linux/miscdevice.h>
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2009-05-12 05:48:27 +08:00
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#include <linux/capability.h>
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2015-10-20 17:54:45 +08:00
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#include <linux/firmware.h>
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2009-03-11 18:19:46 +08:00
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#include <linux/kernel.h>
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2008-07-29 00:44:17 +08:00
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#include <linux/mutex.h>
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#include <linux/cpu.h>
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2009-03-11 18:19:46 +08:00
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#include <linux/fs.h>
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#include <linux/mm.h>
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2008-07-29 00:44:17 +08:00
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2015-10-20 17:54:45 +08:00
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#include <asm/microcode_intel.h>
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2012-01-26 07:09:13 +08:00
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#include <asm/cpu_device_id.h>
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2015-10-20 17:54:45 +08:00
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#include <asm/microcode_amd.h>
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2012-06-08 20:50:50 +08:00
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#include <asm/perf_event.h>
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2015-10-20 17:54:45 +08:00
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#include <asm/microcode.h>
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#include <asm/processor.h>
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#include <asm/cmdline.h>
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2008-07-29 00:44:17 +08:00
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2015-10-20 17:54:46 +08:00
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#define MICROCODE_VERSION "2.01"
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2008-07-29 00:44:17 +08:00
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2009-03-11 18:19:46 +08:00
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static struct microcode_ops *microcode_ops;
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2015-10-20 17:54:46 +08:00
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static bool dis_ucode_ldr;
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2009-05-12 05:48:27 +08:00
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/*
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* Synchronization.
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*
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* All non cpu-hotplug-callback call sites use:
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*
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* - microcode_mutex to synchronize with each other;
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* - get/put_online_cpus() to synchronize with
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* the cpu-hotplug-callback call sites.
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*
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* We guarantee that only a single cpu is being
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* updated at any particular moment of time.
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*/
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2008-08-20 06:22:26 +08:00
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static DEFINE_MUTEX(microcode_mutex);
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2008-07-29 00:44:17 +08:00
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2009-03-11 18:19:46 +08:00
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struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
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2008-07-29 00:44:21 +08:00
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EXPORT_SYMBOL_GPL(ucode_cpu_info);
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2008-07-29 00:44:17 +08:00
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2009-05-12 05:48:27 +08:00
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/*
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* Operations that are run on a target cpu:
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*/
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struct cpu_info_ctx {
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struct cpu_signature *cpu_sig;
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int err;
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};
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2015-10-20 17:54:45 +08:00
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static bool __init check_loader_disabled_bsp(void)
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{
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2016-02-03 19:33:31 +08:00
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static const char *__dis_opt_str = "dis_ucode_ldr";
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2015-10-20 17:54:45 +08:00
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#ifdef CONFIG_X86_32
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const char *cmdline = (const char *)__pa_nodebug(boot_command_line);
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2016-02-03 19:33:31 +08:00
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const char *option = (const char *)__pa_nodebug(__dis_opt_str);
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2015-10-20 17:54:45 +08:00
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bool *res = (bool *)__pa_nodebug(&dis_ucode_ldr);
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#else /* CONFIG_X86_64 */
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const char *cmdline = boot_command_line;
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2016-02-03 19:33:31 +08:00
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const char *option = __dis_opt_str;
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2015-10-20 17:54:45 +08:00
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bool *res = &dis_ucode_ldr;
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#endif
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if (cmdline_find_option_bool(cmdline, option))
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*res = true;
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return *res;
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}
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extern struct builtin_fw __start_builtin_fw[];
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extern struct builtin_fw __end_builtin_fw[];
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bool get_builtin_firmware(struct cpio_data *cd, const char *name)
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{
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#ifdef CONFIG_FW_LOADER
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struct builtin_fw *b_fw;
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for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
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if (!strcmp(name, b_fw->name)) {
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cd->size = b_fw->size;
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cd->data = b_fw->data;
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return true;
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}
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}
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#endif
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return false;
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}
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void __init load_ucode_bsp(void)
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{
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int vendor;
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unsigned int family;
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if (check_loader_disabled_bsp())
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return;
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if (!have_cpuid_p())
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return;
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2015-11-23 18:12:21 +08:00
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vendor = x86_cpuid_vendor();
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family = x86_cpuid_family();
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2015-10-20 17:54:45 +08:00
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switch (vendor) {
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case X86_VENDOR_INTEL:
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if (family >= 6)
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load_ucode_intel_bsp();
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break;
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case X86_VENDOR_AMD:
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if (family >= 0x10)
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load_ucode_amd_bsp(family);
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break;
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default:
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break;
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}
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}
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static bool check_loader_disabled_ap(void)
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{
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#ifdef CONFIG_X86_32
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return *((bool *)__pa_nodebug(&dis_ucode_ldr));
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#else
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return dis_ucode_ldr;
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#endif
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}
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void load_ucode_ap(void)
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{
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int vendor, family;
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if (check_loader_disabled_ap())
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return;
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if (!have_cpuid_p())
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return;
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2015-11-23 18:12:21 +08:00
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vendor = x86_cpuid_vendor();
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family = x86_cpuid_family();
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2015-10-20 17:54:45 +08:00
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switch (vendor) {
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case X86_VENDOR_INTEL:
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if (family >= 6)
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load_ucode_intel_ap();
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break;
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case X86_VENDOR_AMD:
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if (family >= 0x10)
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load_ucode_amd_ap();
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break;
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default:
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break;
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}
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}
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2016-06-06 23:10:43 +08:00
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static int __init save_microcode_in_initrd(void)
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2015-10-20 17:54:45 +08:00
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{
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struct cpuinfo_x86 *c = &boot_cpu_data;
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switch (c->x86_vendor) {
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case X86_VENDOR_INTEL:
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if (c->x86 >= 6)
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save_microcode_in_initrd_intel();
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break;
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case X86_VENDOR_AMD:
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if (c->x86 >= 0x10)
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save_microcode_in_initrd_amd();
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break;
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default:
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break;
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}
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return 0;
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}
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void reload_early_microcode(void)
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{
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int vendor, family;
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2015-11-23 18:12:21 +08:00
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vendor = x86_cpuid_vendor();
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family = x86_cpuid_family();
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2015-10-20 17:54:45 +08:00
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switch (vendor) {
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case X86_VENDOR_INTEL:
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if (family >= 6)
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reload_ucode_intel();
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break;
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case X86_VENDOR_AMD:
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if (family >= 0x10)
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reload_ucode_amd();
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break;
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default:
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break;
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}
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}
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2009-05-12 05:48:27 +08:00
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static void collect_cpu_info_local(void *arg)
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{
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struct cpu_info_ctx *ctx = arg;
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ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(),
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ctx->cpu_sig);
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}
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static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
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{
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struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 };
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int ret;
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ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1);
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if (!ret)
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ret = ctx.err;
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return ret;
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}
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static int collect_cpu_info(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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int ret;
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memset(uci, 0, sizeof(*uci));
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ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig);
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if (!ret)
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uci->valid = 1;
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return ret;
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}
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struct apply_microcode_ctx {
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int err;
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};
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static void apply_microcode_local(void *arg)
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{
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struct apply_microcode_ctx *ctx = arg;
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ctx->err = microcode_ops->apply_microcode(smp_processor_id());
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}
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static int apply_microcode_on_target(int cpu)
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{
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struct apply_microcode_ctx ctx = { .err = 0 };
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int ret;
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ret = smp_call_function_single(cpu, apply_microcode_local, &ctx, 1);
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if (!ret)
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ret = ctx.err;
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return ret;
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}
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2008-07-29 00:44:17 +08:00
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#ifdef CONFIG_MICROCODE_OLD_INTERFACE
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2008-09-12 05:27:52 +08:00
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static int do_microcode_update(const void __user *buf, size_t size)
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2008-07-29 00:44:17 +08:00
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{
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int error = 0;
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int cpu;
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2009-04-15 02:25:42 +08:00
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2008-09-12 05:27:52 +08:00
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for_each_online_cpu(cpu) {
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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2009-05-12 05:48:27 +08:00
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enum ucode_state ustate;
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2008-09-12 05:27:52 +08:00
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if (!uci->valid)
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continue;
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2009-04-15 02:25:42 +08:00
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2009-05-12 05:48:27 +08:00
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ustate = microcode_ops->request_microcode_user(cpu, buf, size);
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if (ustate == UCODE_ERROR) {
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error = -1;
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break;
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} else if (ustate == UCODE_OK)
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apply_microcode_on_target(cpu);
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2008-07-29 00:44:17 +08:00
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}
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2009-05-12 05:48:27 +08:00
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2008-07-29 00:44:17 +08:00
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return error;
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}
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2010-04-10 22:46:21 +08:00
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static int microcode_open(struct inode *inode, struct file *file)
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2008-07-29 00:44:17 +08:00
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{
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2010-04-10 22:46:21 +08:00
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return capable(CAP_SYS_RAWIO) ? nonseekable_open(inode, file) : -EPERM;
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2008-07-29 00:44:17 +08:00
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}
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2008-08-01 18:46:45 +08:00
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static ssize_t microcode_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
|
2008-07-29 00:44:17 +08:00
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{
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2009-05-12 05:48:27 +08:00
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ssize_t ret = -EINVAL;
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2008-07-29 00:44:17 +08:00
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2009-09-22 08:03:05 +08:00
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if ((len >> PAGE_SHIFT) > totalram_pages) {
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2009-12-09 14:30:50 +08:00
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pr_err("too much data (max %ld pages)\n", totalram_pages);
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2009-05-12 05:48:27 +08:00
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return ret;
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2008-07-29 00:44:17 +08:00
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}
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get_online_cpus();
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mutex_lock(µcode_mutex);
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2009-05-12 05:48:27 +08:00
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if (do_microcode_update(buf, len) == 0)
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2008-07-29 00:44:17 +08:00
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ret = (ssize_t)len;
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2012-08-24 21:34:34 +08:00
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if (ret > 0)
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perf_check_microcode();
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2008-07-29 00:44:17 +08:00
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mutex_unlock(µcode_mutex);
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put_online_cpus();
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return ret;
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}
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static const struct file_operations microcode_fops = {
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2009-05-12 05:48:27 +08:00
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.owner = THIS_MODULE,
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.write = microcode_write,
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.open = microcode_open,
|
llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-16 00:52:59 +08:00
|
|
|
.llseek = no_llseek,
|
2008-07-29 00:44:17 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice microcode_dev = {
|
2009-05-12 05:48:27 +08:00
|
|
|
.minor = MICROCODE_MINOR,
|
|
|
|
.name = "microcode",
|
2009-09-19 05:01:12 +08:00
|
|
|
.nodename = "cpu/microcode",
|
2009-05-12 05:48:27 +08:00
|
|
|
.fops = µcode_fops,
|
2008-07-29 00:44:17 +08:00
|
|
|
};
|
|
|
|
|
2008-08-01 18:46:45 +08:00
|
|
|
static int __init microcode_dev_init(void)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
error = misc_register(µcode_dev);
|
|
|
|
if (error) {
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_err("can't misc_register on minor=%d\n", MICROCODE_MINOR);
|
2008-07-29 00:44:17 +08:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-11-07 20:35:32 +08:00
|
|
|
static void __exit microcode_dev_exit(void)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
|
|
|
misc_deregister(µcode_dev);
|
|
|
|
}
|
|
|
|
#else
|
2009-03-11 18:19:46 +08:00
|
|
|
#define microcode_dev_init() 0
|
|
|
|
#define microcode_dev_exit() do { } while (0)
|
2008-07-29 00:44:17 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
/* fake device for request_firmware */
|
2009-03-11 18:19:46 +08:00
|
|
|
static struct platform_device *microcode_pdev;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
static int reload_for_cpu(int cpu)
|
2009-03-11 14:02:36 +08:00
|
|
|
{
|
2009-05-12 05:48:27 +08:00
|
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
2012-07-24 01:05:53 +08:00
|
|
|
enum ucode_state ustate;
|
2009-03-11 14:02:36 +08:00
|
|
|
int err = 0;
|
|
|
|
|
2012-07-24 01:05:53 +08:00
|
|
|
if (!uci->valid)
|
|
|
|
return err;
|
2009-05-12 05:48:27 +08:00
|
|
|
|
2012-07-26 21:51:00 +08:00
|
|
|
ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev, true);
|
2012-07-24 01:05:53 +08:00
|
|
|
if (ustate == UCODE_OK)
|
|
|
|
apply_microcode_on_target(cpu);
|
|
|
|
else
|
|
|
|
if (ustate == UCODE_ERROR)
|
|
|
|
err = -EINVAL;
|
2009-03-11 14:02:36 +08:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
static ssize_t reload_store(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
2009-05-12 05:48:27 +08:00
|
|
|
const char *buf, size_t size)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
2009-05-12 05:48:27 +08:00
|
|
|
unsigned long val;
|
2012-06-21 20:07:16 +08:00
|
|
|
int cpu;
|
|
|
|
ssize_t ret = 0, tmp_ret;
|
|
|
|
|
2012-05-07 01:11:04 +08:00
|
|
|
ret = kstrtoul(buf, 0, &val);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
2009-05-12 05:48:27 +08:00
|
|
|
|
2012-06-21 20:07:16 +08:00
|
|
|
if (val != 1)
|
|
|
|
return size;
|
|
|
|
|
|
|
|
get_online_cpus();
|
2012-06-08 20:50:50 +08:00
|
|
|
mutex_lock(µcode_mutex);
|
2012-06-21 20:07:16 +08:00
|
|
|
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;
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
2012-06-08 20:50:50 +08:00
|
|
|
if (!ret)
|
|
|
|
perf_check_microcode();
|
|
|
|
mutex_unlock(µcode_mutex);
|
2012-06-21 20:07:16 +08:00
|
|
|
put_online_cpus();
|
2009-05-12 05:48:27 +08:00
|
|
|
|
|
|
|
if (!ret)
|
|
|
|
ret = size;
|
|
|
|
|
|
|
|
return ret;
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
static ssize_t version_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
|
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
|
|
|
|
|
2008-08-20 06:22:26 +08:00
|
|
|
return sprintf(buf, "0x%x\n", uci->cpu_sig.rev);
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
static ssize_t pf_show(struct device *dev,
|
|
|
|
struct device_attribute *attr, char *buf)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
|
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
|
|
|
|
|
2008-08-20 06:22:26 +08:00
|
|
|
return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
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);
|
2008-07-29 00:44:17 +08:00
|
|
|
|
|
|
|
static struct attribute *mc_default_attrs[] = {
|
2011-12-22 06:29:42 +08:00
|
|
|
&dev_attr_version.attr,
|
|
|
|
&dev_attr_processor_flags.attr,
|
2008-07-29 00:44:17 +08:00
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group mc_attr_group = {
|
2009-05-12 05:48:27 +08:00
|
|
|
.attrs = mc_default_attrs,
|
|
|
|
.name = "microcode",
|
2008-07-29 00:44:17 +08:00
|
|
|
};
|
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
static void microcode_fini_cpu(int cpu)
|
2008-08-20 06:22:26 +08:00
|
|
|
{
|
|
|
|
microcode_ops->microcode_fini_cpu(cpu);
|
2008-12-20 07:15:24 +08:00
|
|
|
}
|
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
static enum ucode_state microcode_resume_cpu(int cpu)
|
2008-08-20 06:22:26 +08:00
|
|
|
{
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_debug("CPU%d updated upon resume\n", cpu);
|
2012-08-03 21:26:50 +08:00
|
|
|
|
|
|
|
if (apply_microcode_on_target(cpu))
|
|
|
|
return UCODE_ERROR;
|
2009-05-12 05:48:27 +08:00
|
|
|
|
|
|
|
return UCODE_OK;
|
2008-08-20 06:22:26 +08:00
|
|
|
}
|
|
|
|
|
2012-07-26 21:51:00 +08:00
|
|
|
static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
|
2008-08-20 06:22:26 +08:00
|
|
|
{
|
2009-05-12 05:48:27 +08:00
|
|
|
enum ucode_state ustate;
|
2012-12-21 15:44:22 +08:00
|
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
|
|
|
|
2016-02-03 19:33:32 +08:00
|
|
|
if (uci->valid)
|
2012-12-21 15:44:22 +08:00
|
|
|
return UCODE_OK;
|
2008-08-20 06:22:26 +08:00
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
if (collect_cpu_info(cpu))
|
|
|
|
return UCODE_ERROR;
|
2008-08-20 06:22:26 +08:00
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
/* --dimm. Trigger a delayed update? */
|
|
|
|
if (system_state != SYSTEM_RUNNING)
|
|
|
|
return UCODE_NFOUND;
|
2008-08-20 06:22:26 +08:00
|
|
|
|
2012-07-26 21:51:00 +08:00
|
|
|
ustate = microcode_ops->request_microcode_fw(cpu, µcode_pdev->dev,
|
|
|
|
refresh_fw);
|
2008-08-20 06:22:26 +08:00
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
if (ustate == UCODE_OK) {
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_debug("CPU%d updated upon init\n", cpu);
|
2009-05-12 05:48:27 +08:00
|
|
|
apply_microcode_on_target(cpu);
|
2008-08-20 06:22:26 +08:00
|
|
|
}
|
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
return ustate;
|
2008-08-20 06:22:26 +08:00
|
|
|
}
|
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
static enum ucode_state microcode_update_cpu(int cpu)
|
2008-08-20 06:22:26 +08:00
|
|
|
{
|
2009-05-12 05:48:27 +08:00
|
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
2008-08-20 06:22:26 +08:00
|
|
|
|
2009-12-24 07:04:53 +08:00
|
|
|
if (uci->valid)
|
2012-08-03 21:26:50 +08:00
|
|
|
return microcode_resume_cpu(cpu);
|
2008-08-20 06:22:26 +08:00
|
|
|
|
2012-07-26 21:51:00 +08:00
|
|
|
return microcode_init_cpu(cpu, false);
|
2008-08-20 06:22:26 +08:00
|
|
|
}
|
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
static int mc_device_add(struct device *dev, struct subsys_interface *sif)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
2011-12-22 06:29:42 +08:00
|
|
|
int err, cpu = dev->id;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
|
|
|
if (!cpu_online(cpu))
|
|
|
|
return 0;
|
|
|
|
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_debug("CPU%d added\n", cpu);
|
2008-07-29 00:44:17 +08:00
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
err = sysfs_create_group(&dev->kobj, &mc_attr_group);
|
2008-07-29 00:44:17 +08:00
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
2012-07-26 21:51:00 +08:00
|
|
|
if (microcode_init_cpu(cpu, true) == UCODE_ERROR)
|
2011-01-06 23:56:51 +08:00
|
|
|
return -EINVAL;
|
2009-03-11 14:02:36 +08:00
|
|
|
|
|
|
|
return err;
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
|
|
|
|
2015-07-30 17:34:01 +08:00
|
|
|
static void mc_device_remove(struct device *dev, struct subsys_interface *sif)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
2011-12-22 06:29:42 +08:00
|
|
|
int cpu = dev->id;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
|
|
|
if (!cpu_online(cpu))
|
2015-07-30 17:34:01 +08:00
|
|
|
return;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_debug("CPU%d removed\n", cpu);
|
2008-08-20 06:22:26 +08:00
|
|
|
microcode_fini_cpu(cpu);
|
2011-12-22 06:29:42 +08:00
|
|
|
sysfs_remove_group(&dev->kobj, &mc_attr_group);
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
static struct subsys_interface mc_cpu_interface = {
|
|
|
|
.name = "microcode",
|
|
|
|
.subsys = &cpu_subsys,
|
|
|
|
.add_dev = mc_device_add,
|
|
|
|
.remove_dev = mc_device_remove,
|
2011-03-24 05:15:54 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* mc_bp_resume - Update boot CPU microcode during resume.
|
|
|
|
*/
|
|
|
|
static void mc_bp_resume(void)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
2011-03-24 05:15:54 +08:00
|
|
|
int cpu = smp_processor_id();
|
2009-05-12 05:48:27 +08:00
|
|
|
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
if (uci->valid && uci->mc)
|
|
|
|
microcode_ops->apply_microcode(cpu);
|
2014-11-18 17:46:57 +08:00
|
|
|
else if (!uci->mc)
|
2014-12-04 00:21:41 +08:00
|
|
|
reload_early_microcode();
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
|
|
|
|
2011-03-24 05:15:54 +08:00
|
|
|
static struct syscore_ops mc_syscore_ops = {
|
|
|
|
.resume = mc_bp_resume,
|
2008-07-29 00:44:17 +08:00
|
|
|
};
|
|
|
|
|
x86: delete __cpuinit usage from all x86 files
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/x86 uses of the __cpuinit macros from
all C files. x86 only had the one __CPUINIT used in assembly files,
and it wasn't paired off with a .previous or a __FINIT, so we can
delete it directly w/o any corresponding additional change there.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-06-19 06:23:59 +08:00
|
|
|
static int
|
2008-07-29 00:44:17 +08:00
|
|
|
mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
|
|
|
|
{
|
|
|
|
unsigned int cpu = (unsigned long)hcpu;
|
2011-12-22 06:29:42 +08:00
|
|
|
struct device *dev;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
dev = get_cpu_device(cpu);
|
2012-07-24 02:15:10 +08:00
|
|
|
|
|
|
|
switch (action & ~CPU_TASKS_FROZEN) {
|
2008-07-29 00:44:17 +08:00
|
|
|
case CPU_ONLINE:
|
2009-05-12 05:48:27 +08:00
|
|
|
microcode_update_cpu(cpu);
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_debug("CPU%d added\n", cpu);
|
2012-07-24 02:15:10 +08:00
|
|
|
/*
|
|
|
|
* "break" is missing on purpose here because we want to fall
|
|
|
|
* through in order to create the sysfs group.
|
|
|
|
*/
|
|
|
|
|
|
|
|
case CPU_DOWN_FAILED:
|
2011-12-22 06:29:42 +08:00
|
|
|
if (sysfs_create_group(&dev->kobj, &mc_attr_group))
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_err("Failed to create group for CPU%d\n", cpu);
|
2008-07-29 00:44:17 +08:00
|
|
|
break;
|
2012-07-24 02:15:10 +08:00
|
|
|
|
2008-07-29 00:44:17 +08:00
|
|
|
case CPU_DOWN_PREPARE:
|
|
|
|
/* Suspend is in progress, only remove the interface */
|
2011-12-22 06:29:42 +08:00
|
|
|
sysfs_remove_group(&dev->kobj, &mc_attr_group);
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_debug("CPU%d removed\n", cpu);
|
2008-08-20 06:22:26 +08:00
|
|
|
break;
|
2011-10-10 03:42:00 +08:00
|
|
|
|
|
|
|
/*
|
2012-07-24 02:15:10 +08:00
|
|
|
* case CPU_DEAD:
|
|
|
|
*
|
2011-10-10 03:42:00 +08:00
|
|
|
* 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.
|
|
|
|
*/
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
2012-07-24 02:15:10 +08:00
|
|
|
|
|
|
|
/* The CPU refused to come up during a system resume */
|
|
|
|
if (action == CPU_UP_CANCELED_FROZEN)
|
|
|
|
microcode_fini_cpu(cpu);
|
|
|
|
|
2008-07-29 00:44:17 +08:00
|
|
|
return NOTIFY_OK;
|
|
|
|
}
|
|
|
|
|
2015-07-21 00:32:53 +08:00
|
|
|
static struct notifier_block mc_cpu_notifier = {
|
2009-03-11 18:19:46 +08:00
|
|
|
.notifier_call = mc_cpu_callback,
|
2008-07-29 00:44:17 +08:00
|
|
|
};
|
|
|
|
|
2012-06-21 20:07:17 +08:00
|
|
|
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,
|
|
|
|
};
|
|
|
|
|
2015-10-20 17:54:44 +08:00
|
|
|
int __init microcode_init(void)
|
2008-07-29 00:44:17 +08:00
|
|
|
{
|
2015-10-20 17:54:44 +08:00
|
|
|
struct cpuinfo_x86 *c = &boot_cpu_data;
|
2008-07-29 00:44:17 +08:00
|
|
|
int error;
|
|
|
|
|
2016-02-16 16:43:19 +08:00
|
|
|
if (dis_ucode_ldr)
|
2015-01-28 10:21:09 +08:00
|
|
|
return -EINVAL;
|
2014-05-20 02:59:17 +08:00
|
|
|
|
2008-09-23 18:08:44 +08:00
|
|
|
if (c->x86_vendor == X86_VENDOR_INTEL)
|
|
|
|
microcode_ops = init_intel_microcode();
|
2008-09-24 17:50:35 +08:00
|
|
|
else if (c->x86_vendor == X86_VENDOR_AMD)
|
2008-09-23 18:08:44 +08:00
|
|
|
microcode_ops = init_amd_microcode();
|
2012-04-12 22:51:57 +08:00
|
|
|
else
|
2009-12-09 14:30:50 +08:00
|
|
|
pr_err("no support for this CPU vendor\n");
|
2012-04-12 22:51:57 +08:00
|
|
|
|
|
|
|
if (!microcode_ops)
|
2008-09-23 18:08:44 +08:00
|
|
|
return -ENODEV;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
|
|
|
microcode_pdev = platform_device_register_simple("microcode", -1,
|
|
|
|
NULL, 0);
|
2011-11-07 20:35:32 +08:00
|
|
|
if (IS_ERR(microcode_pdev))
|
2008-07-29 00:44:17 +08:00
|
|
|
return PTR_ERR(microcode_pdev);
|
|
|
|
|
|
|
|
get_online_cpus();
|
2009-05-12 05:48:27 +08:00
|
|
|
mutex_lock(µcode_mutex);
|
|
|
|
|
2011-12-22 06:29:42 +08:00
|
|
|
error = subsys_interface_register(&mc_cpu_interface);
|
2012-06-08 20:50:50 +08:00
|
|
|
if (!error)
|
|
|
|
perf_check_microcode();
|
2009-05-12 05:48:27 +08:00
|
|
|
mutex_unlock(µcode_mutex);
|
2008-07-29 00:44:17 +08:00
|
|
|
put_online_cpus();
|
2009-05-12 05:48:27 +08:00
|
|
|
|
2011-11-07 20:35:32 +08:00
|
|
|
if (error)
|
|
|
|
goto out_pdev;
|
2008-07-29 00:44:17 +08:00
|
|
|
|
2012-06-21 20:07:17 +08:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
error = microcode_dev_init();
|
|
|
|
if (error)
|
2012-06-21 20:07:17 +08:00
|
|
|
goto out_ucode_group;
|
2009-05-12 05:48:27 +08:00
|
|
|
|
2011-03-24 05:15:54 +08:00
|
|
|
register_syscore_ops(&mc_syscore_ops);
|
2008-07-29 00:44:17 +08:00
|
|
|
register_hotcpu_notifier(&mc_cpu_notifier);
|
2008-07-29 00:44:21 +08:00
|
|
|
|
2009-05-12 05:48:27 +08:00
|
|
|
pr_info("Microcode Update Driver: v" MICROCODE_VERSION
|
2009-12-09 14:30:50 +08:00
|
|
|
" <tigran@aivazian.fsnet.co.uk>, Peter Oruba\n");
|
2008-07-29 00:44:21 +08:00
|
|
|
|
2008-07-29 00:44:17 +08:00
|
|
|
return 0;
|
2011-11-07 20:35:32 +08:00
|
|
|
|
2012-06-21 20:07:17 +08:00
|
|
|
out_ucode_group:
|
|
|
|
sysfs_remove_group(&cpu_subsys.dev_root->kobj,
|
|
|
|
&cpu_root_microcode_group);
|
|
|
|
|
|
|
|
out_driver:
|
2011-11-07 20:35:32 +08:00
|
|
|
get_online_cpus();
|
|
|
|
mutex_lock(µcode_mutex);
|
|
|
|
|
2012-01-07 03:42:52 +08:00
|
|
|
subsys_interface_unregister(&mc_cpu_interface);
|
2011-11-07 20:35:32 +08:00
|
|
|
|
|
|
|
mutex_unlock(µcode_mutex);
|
|
|
|
put_online_cpus();
|
|
|
|
|
2012-06-21 20:07:17 +08:00
|
|
|
out_pdev:
|
2011-11-07 20:35:32 +08:00
|
|
|
platform_device_unregister(microcode_pdev);
|
|
|
|
return error;
|
|
|
|
|
2008-07-29 00:44:17 +08:00
|
|
|
}
|
2016-06-06 23:10:43 +08:00
|
|
|
fs_initcall(save_microcode_in_initrd);
|
2015-11-20 19:24:00 +08:00
|
|
|
late_initcall(microcode_init);
|