From 757885e94a22bcc82beb9b1445c95218cb20ceab Mon Sep 17 00:00:00 2001 From: Jacob Shin Date: Thu, 30 May 2013 14:09:19 -0500 Subject: x86, microcode, amd: Early microcode patch loading support for AMD Add early microcode patch loading support for AMD. Signed-off-by: Jacob Shin Link: http://lkml.kernel.org/r/1369940959-2077-5-git-send-email-jacob.shin@amd.com Signed-off-by: H. Peter Anvin Cc: Fenghua Yu --- arch/x86/kernel/microcode_amd_early.c | 222 ++++++++++++++++++++++++++++++++++ 1 file changed, 222 insertions(+) create mode 100644 arch/x86/kernel/microcode_amd_early.c (limited to 'arch/x86/kernel/microcode_amd_early.c') diff --git a/arch/x86/kernel/microcode_amd_early.c b/arch/x86/kernel/microcode_amd_early.c new file mode 100644 index 000000000000..7e54d97c714a --- /dev/null +++ b/arch/x86/kernel/microcode_amd_early.c @@ -0,0 +1,222 @@ +/* + * Copyright (C) 2013 Advanced Micro Devices, Inc. + * + * Author: Jacob Shin + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include + +#include +#include +#include + +static bool ucode_loaded; +static u32 ucode_new_rev; + +/* + * Microcode patch container file is prepended to the initrd in cpio format. + * See Documentation/x86/early-microcode.txt + */ +static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin"; + +static struct cpio_data __init find_ucode_in_initrd(void) +{ + long offset = 0; + struct cpio_data cd; + +#ifdef CONFIG_X86_32 + /* + * On 32-bit, early load occurs before paging is turned on so we need + * to use physical addresses. + */ + if (!(read_cr0() & X86_CR0_PG)) { + struct boot_params *p; + p = (struct boot_params *)__pa_nodebug(&boot_params); + cd = find_cpio_data((char *)__pa_nodebug(ucode_path), + (void *)p->hdr.ramdisk_image, p->hdr.ramdisk_size, + &offset); + } else +#endif + cd = find_cpio_data(ucode_path, + (void *)(boot_params.hdr.ramdisk_image + PAGE_OFFSET), + boot_params.hdr.ramdisk_size, &offset); + + if (*(u32 *)cd.data != UCODE_MAGIC) { + cd.data = NULL; + cd.size = 0; + } + + return cd; +} + +/* + * Early load occurs before we can vmalloc(). So we look for the microcode + * patch container file in initrd, traverse equivalent cpu table, look for a + * matching microcode patch, and update, all in initrd memory in place. + * When vmalloc() is available for use later -- on 64-bit during first AP load, + * and on 32-bit during save_microcode_in_initrd_amd() -- we can call + * load_microcode_amd() to save equivalent cpu table and microcode patches in + * kernel heap memory. + */ +static void __init apply_ucode_in_initrd(void) +{ + struct cpio_data cd; + struct equiv_cpu_entry *eq; + u32 *header; + u8 *data; + u16 eq_id; + int offset, left; + u32 rev, dummy; + u32 *new_rev; + +#ifdef CONFIG_X86_32 + new_rev = (u32 *)__pa_nodebug(&ucode_new_rev); +#else + new_rev = &ucode_new_rev; +#endif + cd = find_ucode_in_initrd(); + if (!cd.data) + return; + + data = cd.data; + left = cd.size; + header = (u32 *)data; + + /* find equiv cpu table */ + + if (header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */ + header[2] == 0) /* size */ + return; + + eq = (struct equiv_cpu_entry *)(data + CONTAINER_HDR_SZ); + offset = header[2] + CONTAINER_HDR_SZ; + data += offset; + left -= offset; + + eq_id = find_equiv_id(eq, cpuid_eax(0x00000001)); + if (!eq_id) + return; + + /* find ucode and update if needed */ + + rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy); + + while (left > 0) { + struct microcode_amd *mc; + + header = (u32 *)data; + if (header[0] != UCODE_UCODE_TYPE || /* type */ + header[1] == 0) /* size */ + break; + + mc = (struct microcode_amd *)(data + SECTION_HDR_SIZE); + if (eq_id == mc->hdr.processor_rev_id && rev < mc->hdr.patch_id) + if (__apply_microcode_amd(mc) == 0) { + if (!(*new_rev)) + *new_rev = mc->hdr.patch_id; + break; + } + + offset = header[1] + SECTION_HDR_SIZE; + data += offset; + left -= offset; + } +} + +void __init load_ucode_amd_bsp(void) +{ + apply_ucode_in_initrd(); +} + +#ifdef CONFIG_X86_32 +u8 __cpuinitdata amd_bsp_mpb[MPB_MAX_SIZE]; + +/* + * On 32-bit, since AP's early load occurs before paging is turned on, we + * cannot traverse cpu_equiv_table and pcache in kernel heap memory. So during + * cold boot, AP will apply_ucode_in_initrd() just like the BSP. During + * save_microcode_in_initrd_amd() BSP's patch is copied to amd_bsp_mpb, which + * is used upon resume from suspend. + */ +void __cpuinit load_ucode_amd_ap(void) +{ + struct microcode_amd *mc; + + mc = (struct microcode_amd *)__pa_nodebug(amd_bsp_mpb); + if (mc->hdr.patch_id && mc->hdr.processor_rev_id) + __apply_microcode_amd(mc); + else + apply_ucode_in_initrd(); +} + +static void __init collect_cpu_sig_on_bsp(void *arg) +{ + unsigned int cpu = smp_processor_id(); + struct ucode_cpu_info *uci = ucode_cpu_info + cpu; + uci->cpu_sig.sig = cpuid_eax(0x00000001); +} +#else +static void __cpuinit collect_cpu_info_amd_early(struct cpuinfo_x86 *c, + struct ucode_cpu_info *uci) +{ + u32 rev, eax; + + rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax); + eax = cpuid_eax(0x00000001); + + uci->cpu_sig.sig = eax; + uci->cpu_sig.rev = rev; + c->microcode = rev; + c->x86 = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff); +} + +void __cpuinit load_ucode_amd_ap(void) +{ + unsigned int cpu = smp_processor_id(); + + collect_cpu_info_amd_early(&cpu_data(cpu), ucode_cpu_info + cpu); + + if (cpu && !ucode_loaded) { + struct cpio_data cd = find_ucode_in_initrd(); + if (load_microcode_amd(0, cd.data, cd.size) != UCODE_OK) + return; + ucode_loaded = true; + } + + apply_microcode_amd(cpu); +} +#endif + +int __init save_microcode_in_initrd_amd(void) +{ + enum ucode_state ret; + struct cpio_data cd; +#ifdef CONFIG_X86_32 + unsigned int bsp = boot_cpu_data.cpu_index; + struct ucode_cpu_info *uci = ucode_cpu_info + bsp; + + if (!uci->cpu_sig.sig) + smp_call_function_single(bsp, collect_cpu_sig_on_bsp, NULL, 1); +#endif + if (ucode_new_rev) + pr_info("microcode: updated early to new patch_level=0x%08x\n", + ucode_new_rev); + + if (ucode_loaded) + return 0; + + cd = find_ucode_in_initrd(); + if (!cd.data) + return -EINVAL; + + ret = load_microcode_amd(0, cd.data, cd.size); + if (ret != UCODE_OK) + return -EINVAL; + + ucode_loaded = true; + return 0; +} -- cgit v1.2.3