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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-07 00:02:14 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-07 00:02:14 +0100 |
commit | 82406da4a6998a0c98db0c5afb1695f97889bf79 (patch) | |
tree | 0e56593781cfe0a35143bc51525f803988ae28b1 /arch/x86 | |
parent | Merge branch 'x86-rdrand-for-linus' of git://git.kernel.org/pub/scm/linux/ker... (diff) | |
parent | Merge branch 'ucode-verify-size' of git://git.kernel.org/pub/scm/linux/kernel... (diff) | |
download | linux-82406da4a6998a0c98db0c5afb1695f97889bf79.tar.xz linux-82406da4a6998a0c98db0c5afb1695f97889bf79.zip |
Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, microcode, AMD: Update copyrights
x86, microcode, AMD: Exit early on success
x86, microcode, AMD: Simplify ucode verification
x86, microcode, AMD: Add a reusable buffer
x86, microcode, AMD: Add a vendor-specific exit function
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/include/asm/microcode.h | 2 | ||||
-rw-r--r-- | arch/x86/kernel/microcode_amd.c | 209 | ||||
-rw-r--r-- | arch/x86/kernel/microcode_core.c | 5 |
3 files changed, 121 insertions, 95 deletions
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h index 24215072d0e1..4ebe157bf73d 100644 --- a/arch/x86/include/asm/microcode.h +++ b/arch/x86/include/asm/microcode.h @@ -48,6 +48,7 @@ static inline struct microcode_ops * __init init_intel_microcode(void) #ifdef CONFIG_MICROCODE_AMD extern struct microcode_ops * __init init_amd_microcode(void); +extern void __exit exit_amd_microcode(void); static inline void get_ucode_data(void *to, const u8 *from, size_t n) { @@ -59,6 +60,7 @@ static inline struct microcode_ops * __init init_amd_microcode(void) { return NULL; } +static inline void __exit exit_amd_microcode(void) {} #endif #endif /* _ASM_X86_MICROCODE_H */ diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index d494799aafcd..fe86493f3ed1 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -1,14 +1,18 @@ /* * AMD CPU Microcode Update Driver for Linux - * Copyright (C) 2008 Advanced Micro Devices Inc. + * Copyright (C) 2008-2011 Advanced Micro Devices Inc. * * Author: Peter Oruba <peter.oruba@amd.com> * * Based on work by: * Tigran Aivazian <tigran@aivazian.fsnet.co.uk> * - * This driver allows to upgrade microcode on AMD - * family 0x10 and 0x11 processors. + * Maintainers: + * Andreas Herrmann <andreas.herrmann3@amd.com> + * Borislav Petkov <borislav.petkov@amd.com> + * + * This driver allows to upgrade microcode on F10h AMD + * CPUs and later. * * Licensed under the terms of the GNU General Public * License version 2. See file COPYING for details. @@ -71,6 +75,9 @@ struct microcode_amd { static struct equiv_cpu_entry *equiv_cpu_table; +/* page-sized ucode patch buffer */ +void *patch; + static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig) { struct cpuinfo_x86 *c = &cpu_data(cpu); @@ -86,27 +93,76 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig) return 0; } -static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr, - int rev) +static unsigned int verify_ucode_size(int cpu, u32 patch_size, + unsigned int size) { - unsigned int current_cpu_id; - u16 equiv_cpu_id = 0; - unsigned int i = 0; + struct cpuinfo_x86 *c = &cpu_data(cpu); + u32 max_size; + +#define F1XH_MPB_MAX_SIZE 2048 +#define F14H_MPB_MAX_SIZE 1824 +#define F15H_MPB_MAX_SIZE 4096 + + switch (c->x86) { + case 0x14: + max_size = F14H_MPB_MAX_SIZE; + break; + case 0x15: + max_size = F15H_MPB_MAX_SIZE; + break; + default: + max_size = F1XH_MPB_MAX_SIZE; + break; + } + + if (patch_size > min_t(u32, size, max_size)) { + pr_err("patch size mismatch\n"); + return 0; + } + + return patch_size; +} + +static u16 find_equiv_id(void) +{ + unsigned int current_cpu_id, i = 0; BUG_ON(equiv_cpu_table == NULL); + current_cpu_id = cpuid_eax(0x00000001); while (equiv_cpu_table[i].installed_cpu != 0) { - if (current_cpu_id == equiv_cpu_table[i].installed_cpu) { - equiv_cpu_id = equiv_cpu_table[i].equiv_cpu; - break; - } + if (current_cpu_id == equiv_cpu_table[i].installed_cpu) + return equiv_cpu_table[i].equiv_cpu; + i++; } + return 0; +} +/* + * we signal a good patch is found by returning its size > 0 + */ +static int get_matching_microcode(int cpu, const u8 *ucode_ptr, + unsigned int leftover_size, int rev, + unsigned int *current_size) +{ + struct microcode_header_amd *mc_hdr; + unsigned int actual_size; + u16 equiv_cpu_id; + + /* size of the current patch we're staring at */ + *current_size = *(u32 *)(ucode_ptr + 4) + SECTION_HDR_SIZE; + + equiv_cpu_id = find_equiv_id(); if (!equiv_cpu_id) return 0; + /* + * let's look at the patch header itself now + */ + mc_hdr = (struct microcode_header_amd *)(ucode_ptr + SECTION_HDR_SIZE); + if (mc_hdr->processor_rev_id != equiv_cpu_id) return 0; @@ -120,7 +176,20 @@ static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr, if (mc_hdr->patch_id <= rev) return 0; - return 1; + /* + * now that the header looks sane, verify its size + */ + actual_size = verify_ucode_size(cpu, *current_size, leftover_size); + if (!actual_size) + return 0; + + /* clear the patch buffer */ + memset(patch, 0, PAGE_SIZE); + + /* all looks ok, get the binary patch */ + get_ucode_data(patch, ucode_ptr + SECTION_HDR_SIZE, actual_size); + + return actual_size; } static int apply_microcode_amd(int cpu) @@ -155,63 +224,6 @@ static int apply_microcode_amd(int cpu) return 0; } -static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size) -{ - struct cpuinfo_x86 *c = &cpu_data(cpu); - u32 max_size, actual_size; - -#define F1XH_MPB_MAX_SIZE 2048 -#define F14H_MPB_MAX_SIZE 1824 -#define F15H_MPB_MAX_SIZE 4096 - - switch (c->x86) { - case 0x14: - max_size = F14H_MPB_MAX_SIZE; - break; - case 0x15: - max_size = F15H_MPB_MAX_SIZE; - break; - default: - max_size = F1XH_MPB_MAX_SIZE; - break; - } - - actual_size = *(u32 *)(buf + 4); - - if (actual_size + SECTION_HDR_SIZE > size || actual_size > max_size) { - pr_err("section size mismatch\n"); - return 0; - } - - return actual_size; -} - -static struct microcode_header_amd * -get_next_ucode(int cpu, const u8 *buf, unsigned int size, unsigned int *mc_size) -{ - struct microcode_header_amd *mc = NULL; - unsigned int actual_size = 0; - - if (*(u32 *)buf != UCODE_UCODE_TYPE) { - pr_err("invalid type field in container file section header\n"); - goto out; - } - - actual_size = verify_ucode_size(cpu, buf, size); - if (!actual_size) - goto out; - - mc = vzalloc(actual_size); - if (!mc) - goto out; - - get_ucode_data(mc, buf + SECTION_HDR_SIZE, actual_size); - *mc_size = actual_size + SECTION_HDR_SIZE; - -out: - return mc; -} - static int install_equiv_cpu_table(const u8 *buf) { unsigned int *ibuf = (unsigned int *)buf; @@ -247,36 +259,38 @@ generic_load_microcode(int cpu, const u8 *data, size_t size) { struct ucode_cpu_info *uci = ucode_cpu_info + cpu; struct microcode_header_amd *mc_hdr = NULL; - unsigned int mc_size, leftover; + unsigned int mc_size, leftover, current_size = 0; int offset; const u8 *ucode_ptr = data; void *new_mc = NULL; unsigned int new_rev = uci->cpu_sig.rev; - enum ucode_state state = UCODE_OK; + enum ucode_state state = UCODE_ERROR; offset = install_equiv_cpu_table(ucode_ptr); if (offset < 0) { pr_err("failed to create equivalent cpu table\n"); - return UCODE_ERROR; + goto out; } - ucode_ptr += offset; leftover = size - offset; - while (leftover) { - mc_hdr = get_next_ucode(cpu, ucode_ptr, leftover, &mc_size); - if (!mc_hdr) - break; + if (*(u32 *)ucode_ptr != UCODE_UCODE_TYPE) { + pr_err("invalid type field in container file section header\n"); + goto free_table; + } - if (get_matching_microcode(cpu, mc_hdr, new_rev)) { - vfree(new_mc); + while (leftover) { + mc_size = get_matching_microcode(cpu, ucode_ptr, leftover, + new_rev, ¤t_size); + if (mc_size) { + mc_hdr = patch; + new_mc = patch; new_rev = mc_hdr->patch_id; - new_mc = mc_hdr; - } else - vfree(mc_hdr); + goto out_ok; + } - ucode_ptr += mc_size; - leftover -= mc_size; + ucode_ptr += current_size; + leftover -= current_size; } if (!new_mc) { @@ -284,19 +298,16 @@ generic_load_microcode(int cpu, const u8 *data, size_t size) goto free_table; } - if (!leftover) { - vfree(uci->mc); - uci->mc = new_mc; - pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n", - cpu, uci->cpu_sig.rev, new_rev); - } else { - vfree(new_mc); - state = UCODE_ERROR; - } +out_ok: + uci->mc = new_mc; + state = UCODE_OK; + pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n", + cpu, uci->cpu_sig.rev, new_rev); free_table: free_equiv_cpu_table(); +out: return state; } @@ -337,7 +348,6 @@ static void microcode_fini_cpu_amd(int cpu) { struct ucode_cpu_info *uci = ucode_cpu_info + cpu; - vfree(uci->mc); uci->mc = NULL; } @@ -351,5 +361,14 @@ static struct microcode_ops microcode_amd_ops = { struct microcode_ops * __init init_amd_microcode(void) { + patch = (void *)get_zeroed_page(GFP_KERNEL); + if (!patch) + return NULL; + return µcode_amd_ops; } + +void __exit exit_amd_microcode(void) +{ + free_page((unsigned long)patch); +} diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c index 9d46f5e43b51..9302e2d0eb4b 100644 --- a/arch/x86/kernel/microcode_core.c +++ b/arch/x86/kernel/microcode_core.c @@ -563,6 +563,8 @@ 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); @@ -580,6 +582,9 @@ static void __exit microcode_exit(void) 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); |