mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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
This commit is contained in:
Linus Torvalds
commit
82406da4a6
@ -48,6 +48,7 @@ static inline struct microcode_ops * __init init_intel_microcode(void)
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#ifdef CONFIG_MICROCODE_AMD
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extern struct microcode_ops * __init init_amd_microcode(void);
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extern void __exit exit_amd_microcode(void);
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static inline void get_ucode_data(void *to, const u8 *from, size_t n)
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{
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@ -59,6 +60,7 @@ static inline struct microcode_ops * __init init_amd_microcode(void)
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{
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return NULL;
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}
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static inline void __exit exit_amd_microcode(void) {}
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#endif
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#endif /* _ASM_X86_MICROCODE_H */
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@ -1,14 +1,18 @@
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/*
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* AMD CPU Microcode Update Driver for Linux
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* Copyright (C) 2008 Advanced Micro Devices Inc.
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* Copyright (C) 2008-2011 Advanced Micro Devices Inc.
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*
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* Author: Peter Oruba <peter.oruba@amd.com>
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*
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* Based on work by:
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* Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
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*
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* This driver allows to upgrade microcode on AMD
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* family 0x10 and 0x11 processors.
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* Maintainers:
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* Andreas Herrmann <andreas.herrmann3@amd.com>
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* Borislav Petkov <borislav.petkov@amd.com>
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*
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* This driver allows to upgrade microcode on F10h AMD
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* CPUs and later.
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*
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* Licensed under the terms of the GNU General Public
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* License version 2. See file COPYING for details.
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@ -71,6 +75,9 @@ struct microcode_amd {
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static struct equiv_cpu_entry *equiv_cpu_table;
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/* page-sized ucode patch buffer */
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void *patch;
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static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
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{
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struct cpuinfo_x86 *c = &cpu_data(cpu);
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@ -86,27 +93,76 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
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return 0;
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}
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static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr,
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int rev)
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static unsigned int verify_ucode_size(int cpu, u32 patch_size,
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unsigned int size)
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{
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unsigned int current_cpu_id;
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u16 equiv_cpu_id = 0;
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unsigned int i = 0;
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struct cpuinfo_x86 *c = &cpu_data(cpu);
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u32 max_size;
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#define F1XH_MPB_MAX_SIZE 2048
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#define F14H_MPB_MAX_SIZE 1824
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#define F15H_MPB_MAX_SIZE 4096
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switch (c->x86) {
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case 0x14:
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max_size = F14H_MPB_MAX_SIZE;
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break;
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case 0x15:
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max_size = F15H_MPB_MAX_SIZE;
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break;
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default:
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max_size = F1XH_MPB_MAX_SIZE;
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break;
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}
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if (patch_size > min_t(u32, size, max_size)) {
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pr_err("patch size mismatch\n");
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return 0;
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}
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return patch_size;
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}
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static u16 find_equiv_id(void)
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{
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unsigned int current_cpu_id, i = 0;
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BUG_ON(equiv_cpu_table == NULL);
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current_cpu_id = cpuid_eax(0x00000001);
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while (equiv_cpu_table[i].installed_cpu != 0) {
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if (current_cpu_id == equiv_cpu_table[i].installed_cpu) {
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equiv_cpu_id = equiv_cpu_table[i].equiv_cpu;
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break;
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}
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if (current_cpu_id == equiv_cpu_table[i].installed_cpu)
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return equiv_cpu_table[i].equiv_cpu;
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i++;
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}
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return 0;
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}
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/*
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* we signal a good patch is found by returning its size > 0
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*/
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static int get_matching_microcode(int cpu, const u8 *ucode_ptr,
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unsigned int leftover_size, int rev,
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unsigned int *current_size)
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{
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struct microcode_header_amd *mc_hdr;
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unsigned int actual_size;
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u16 equiv_cpu_id;
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/* size of the current patch we're staring at */
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*current_size = *(u32 *)(ucode_ptr + 4) + SECTION_HDR_SIZE;
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equiv_cpu_id = find_equiv_id();
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if (!equiv_cpu_id)
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return 0;
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/*
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* let's look at the patch header itself now
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*/
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mc_hdr = (struct microcode_header_amd *)(ucode_ptr + SECTION_HDR_SIZE);
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if (mc_hdr->processor_rev_id != equiv_cpu_id)
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return 0;
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@ -120,7 +176,20 @@ static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr,
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if (mc_hdr->patch_id <= rev)
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return 0;
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return 1;
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/*
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* now that the header looks sane, verify its size
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*/
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actual_size = verify_ucode_size(cpu, *current_size, leftover_size);
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if (!actual_size)
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return 0;
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/* clear the patch buffer */
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memset(patch, 0, PAGE_SIZE);
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/* all looks ok, get the binary patch */
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get_ucode_data(patch, ucode_ptr + SECTION_HDR_SIZE, actual_size);
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return actual_size;
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}
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static int apply_microcode_amd(int cpu)
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@ -155,63 +224,6 @@ static int apply_microcode_amd(int cpu)
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return 0;
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}
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static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size)
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{
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struct cpuinfo_x86 *c = &cpu_data(cpu);
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u32 max_size, actual_size;
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#define F1XH_MPB_MAX_SIZE 2048
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#define F14H_MPB_MAX_SIZE 1824
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#define F15H_MPB_MAX_SIZE 4096
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switch (c->x86) {
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case 0x14:
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max_size = F14H_MPB_MAX_SIZE;
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break;
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case 0x15:
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max_size = F15H_MPB_MAX_SIZE;
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break;
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default:
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max_size = F1XH_MPB_MAX_SIZE;
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break;
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}
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actual_size = *(u32 *)(buf + 4);
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if (actual_size + SECTION_HDR_SIZE > size || actual_size > max_size) {
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pr_err("section size mismatch\n");
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return 0;
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}
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return actual_size;
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}
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static struct microcode_header_amd *
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get_next_ucode(int cpu, const u8 *buf, unsigned int size, unsigned int *mc_size)
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{
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struct microcode_header_amd *mc = NULL;
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unsigned int actual_size = 0;
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if (*(u32 *)buf != UCODE_UCODE_TYPE) {
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pr_err("invalid type field in container file section header\n");
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goto out;
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}
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actual_size = verify_ucode_size(cpu, buf, size);
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if (!actual_size)
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goto out;
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mc = vzalloc(actual_size);
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if (!mc)
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goto out;
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get_ucode_data(mc, buf + SECTION_HDR_SIZE, actual_size);
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*mc_size = actual_size + SECTION_HDR_SIZE;
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out:
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return mc;
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}
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static int install_equiv_cpu_table(const u8 *buf)
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{
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unsigned int *ibuf = (unsigned int *)buf;
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@ -247,36 +259,38 @@ generic_load_microcode(int cpu, const u8 *data, size_t size)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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struct microcode_header_amd *mc_hdr = NULL;
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unsigned int mc_size, leftover;
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unsigned int mc_size, leftover, current_size = 0;
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int offset;
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const u8 *ucode_ptr = data;
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void *new_mc = NULL;
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unsigned int new_rev = uci->cpu_sig.rev;
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enum ucode_state state = UCODE_OK;
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enum ucode_state state = UCODE_ERROR;
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offset = install_equiv_cpu_table(ucode_ptr);
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if (offset < 0) {
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pr_err("failed to create equivalent cpu table\n");
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return UCODE_ERROR;
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goto out;
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}
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ucode_ptr += offset;
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leftover = size - offset;
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if (*(u32 *)ucode_ptr != UCODE_UCODE_TYPE) {
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pr_err("invalid type field in container file section header\n");
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goto free_table;
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}
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while (leftover) {
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mc_hdr = get_next_ucode(cpu, ucode_ptr, leftover, &mc_size);
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if (!mc_hdr)
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break;
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if (get_matching_microcode(cpu, mc_hdr, new_rev)) {
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vfree(new_mc);
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mc_size = get_matching_microcode(cpu, ucode_ptr, leftover,
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new_rev, ¤t_size);
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if (mc_size) {
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mc_hdr = patch;
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new_mc = patch;
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new_rev = mc_hdr->patch_id;
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new_mc = mc_hdr;
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} else
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vfree(mc_hdr);
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goto out_ok;
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}
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ucode_ptr += mc_size;
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leftover -= mc_size;
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ucode_ptr += current_size;
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leftover -= current_size;
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}
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if (!new_mc) {
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@ -284,19 +298,16 @@ generic_load_microcode(int cpu, const u8 *data, size_t size)
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goto free_table;
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}
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if (!leftover) {
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vfree(uci->mc);
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uci->mc = new_mc;
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pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n",
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cpu, uci->cpu_sig.rev, new_rev);
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} else {
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vfree(new_mc);
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state = UCODE_ERROR;
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}
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out_ok:
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uci->mc = new_mc;
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state = UCODE_OK;
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pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n",
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cpu, uci->cpu_sig.rev, new_rev);
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free_table:
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free_equiv_cpu_table();
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out:
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return state;
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}
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@ -337,7 +348,6 @@ static void microcode_fini_cpu_amd(int cpu)
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{
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struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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vfree(uci->mc);
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uci->mc = NULL;
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}
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@ -351,5 +361,14 @@ static struct microcode_ops microcode_amd_ops = {
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struct microcode_ops * __init init_amd_microcode(void)
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{
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patch = (void *)get_zeroed_page(GFP_KERNEL);
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if (!patch)
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return NULL;
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return µcode_amd_ops;
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}
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void __exit exit_amd_microcode(void)
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{
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free_page((unsigned long)patch);
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}
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@ -563,6 +563,8 @@ module_init(microcode_init);
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static void __exit microcode_exit(void)
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{
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struct cpuinfo_x86 *c = &cpu_data(0);
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microcode_dev_exit();
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unregister_hotcpu_notifier(&mc_cpu_notifier);
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@ -580,6 +582,9 @@ static void __exit microcode_exit(void)
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microcode_ops = NULL;
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if (c->x86_vendor == X86_VENDOR_AMD)
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exit_amd_microcode();
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pr_info("Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
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}
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module_exit(microcode_exit);
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