2 * Copyright (C) 2013 Advanced Micro Devices, Inc.
4 * Author: Jacob Shin <jacob.shin@amd.com>
5 * Fixes: Borislav Petkov <bp@suse.de>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/earlycpio.h>
13 #include <linux/initrd.h>
16 #include <asm/setup.h>
17 #include <asm/microcode_amd.h>
20 * This points to the current valid container of microcode patches which we will
21 * save from the initrd before jettisoning its contents.
24 static size_t container_size;
26 static u32 ucode_new_rev;
27 u8 amd_ucode_patch[PATCH_MAX_SIZE];
28 static u16 this_equiv_id;
30 static struct cpio_data ucode_cpio;
33 * Microcode patch container file is prepended to the initrd in cpio format.
34 * See Documentation/x86/early-microcode.txt
36 static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
38 static struct cpio_data __init find_ucode_in_initrd(void)
46 struct boot_params *p;
49 * On 32-bit, early load occurs before paging is turned on so we need
50 * to use physical addresses.
52 p = (struct boot_params *)__pa_nodebug(&boot_params);
53 path = (char *)__pa_nodebug(ucode_path);
54 start = (void *)p->hdr.ramdisk_image;
55 size = p->hdr.ramdisk_size;
58 start = (void *)(boot_params.hdr.ramdisk_image + PAGE_OFFSET);
59 size = boot_params.hdr.ramdisk_size;
62 return find_cpio_data(path, start, size, &offset);
65 static size_t compute_container_size(u8 *data, u32 total_size)
68 u32 *header = (u32 *)data;
70 if (header[0] != UCODE_MAGIC ||
71 header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
72 header[2] == 0) /* size */
75 size = header[2] + CONTAINER_HDR_SZ;
84 if (header[0] != UCODE_UCODE_TYPE)
88 * Sanity-check patch size.
90 patch_size = header[1];
91 if (patch_size > PATCH_MAX_SIZE)
94 size += patch_size + SECTION_HDR_SIZE;
95 data += patch_size + SECTION_HDR_SIZE;
96 total_size -= patch_size + SECTION_HDR_SIZE;
103 * Early load occurs before we can vmalloc(). So we look for the microcode
104 * patch container file in initrd, traverse equivalent cpu table, look for a
105 * matching microcode patch, and update, all in initrd memory in place.
106 * When vmalloc() is available for use later -- on 64-bit during first AP load,
107 * and on 32-bit during save_microcode_in_initrd_amd() -- we can call
108 * load_microcode_amd() to save equivalent cpu table and microcode patches in
109 * kernel heap memory.
111 static void apply_ucode_in_initrd(void *ucode, size_t size, bool save_patch)
113 struct equiv_cpu_entry *eq;
117 u8 (*patch)[PATCH_MAX_SIZE];
120 u32 rev, eax, ebx, ecx, edx;
124 new_rev = (u32 *)__pa_nodebug(&ucode_new_rev);
125 cont_sz = (size_t *)__pa_nodebug(&container_size);
126 cont = (u8 **)__pa_nodebug(&container);
127 patch = (u8 (*)[PATCH_MAX_SIZE])__pa_nodebug(&amd_ucode_patch);
129 new_rev = &ucode_new_rev;
130 cont_sz = &container_size;
132 patch = &amd_ucode_patch;
137 header = (u32 *)data;
139 /* find equiv cpu table */
140 if (header[0] != UCODE_MAGIC ||
141 header[1] != UCODE_EQUIV_CPU_TABLE_TYPE || /* type */
142 header[2] == 0) /* size */
147 native_cpuid(&eax, &ebx, &ecx, &edx);
150 eq = (struct equiv_cpu_entry *)(data + CONTAINER_HDR_SZ);
154 /* Advance past the container header */
155 offset = header[2] + CONTAINER_HDR_SZ;
159 eq_id = find_equiv_id(eq, eax);
161 this_equiv_id = eq_id;
162 *cont_sz = compute_container_size(*cont, left + offset);
165 * truncate how much we need to iterate over in the
166 * ucode update loop below
168 left = *cont_sz - offset;
173 * support multiple container files appended together. if this
174 * one does not have a matching equivalent cpu entry, we fast
175 * forward to the next container file.
178 header = (u32 *)data;
179 if (header[0] == UCODE_MAGIC &&
180 header[1] == UCODE_EQUIV_CPU_TABLE_TYPE)
183 offset = header[1] + SECTION_HDR_SIZE;
188 /* mark where the next microcode container file starts */
189 offset = data - (u8 *)ucode;
199 /* find ucode and update if needed */
201 native_rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
204 struct microcode_amd *mc;
206 header = (u32 *)data;
207 if (header[0] != UCODE_UCODE_TYPE || /* type */
208 header[1] == 0) /* size */
211 mc = (struct microcode_amd *)(data + SECTION_HDR_SIZE);
213 if (eq_id == mc->hdr.processor_rev_id && rev < mc->hdr.patch_id) {
215 if (!__apply_microcode_amd(mc)) {
216 rev = mc->hdr.patch_id;
221 min_t(u32, header[1], PATCH_MAX_SIZE));
225 offset = header[1] + SECTION_HDR_SIZE;
231 void __init load_ucode_amd_bsp(void)
238 data = (void **)__pa_nodebug(&ucode_cpio.data);
239 size = (size_t *)__pa_nodebug(&ucode_cpio.size);
241 data = &ucode_cpio.data;
242 size = &ucode_cpio.size;
245 cp = find_ucode_in_initrd();
252 apply_ucode_in_initrd(cp.data, cp.size, true);
257 * On 32-bit, since AP's early load occurs before paging is turned on, we
258 * cannot traverse cpu_equiv_table and pcache in kernel heap memory. So during
259 * cold boot, AP will apply_ucode_in_initrd() just like the BSP. During
260 * save_microcode_in_initrd_amd() BSP's patch is copied to amd_ucode_patch,
261 * which is used upon resume from suspend.
263 void load_ucode_amd_ap(void)
265 struct microcode_amd *mc;
269 mc = (struct microcode_amd *)__pa_nodebug(amd_ucode_patch);
270 if (mc->hdr.patch_id && mc->hdr.processor_rev_id) {
271 __apply_microcode_amd(mc);
275 ucode = (void *)__pa_nodebug(&container);
276 usize = (size_t *)__pa_nodebug(&container_size);
278 if (!*ucode || !*usize)
281 apply_ucode_in_initrd(*ucode, *usize, false);
284 static void __init collect_cpu_sig_on_bsp(void *arg)
286 unsigned int cpu = smp_processor_id();
287 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
289 uci->cpu_sig.sig = cpuid_eax(0x00000001);
292 static void __init get_bsp_sig(void)
294 unsigned int bsp = boot_cpu_data.cpu_index;
295 struct ucode_cpu_info *uci = ucode_cpu_info + bsp;
297 if (!uci->cpu_sig.sig)
298 smp_call_function_single(bsp, collect_cpu_sig_on_bsp, NULL, 1);
301 void load_ucode_amd_ap(void)
303 unsigned int cpu = smp_processor_id();
304 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
305 struct equiv_cpu_entry *eq;
306 struct microcode_amd *mc;
310 /* Exit if called on the BSP. */
317 rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
319 uci->cpu_sig.rev = rev;
320 uci->cpu_sig.sig = eax;
322 eax = cpuid_eax(0x00000001);
323 eq = (struct equiv_cpu_entry *)(container + CONTAINER_HDR_SZ);
325 eq_id = find_equiv_id(eq, eax);
329 if (eq_id == this_equiv_id) {
330 mc = (struct microcode_amd *)amd_ucode_patch;
332 if (mc && rev < mc->hdr.patch_id) {
333 if (!__apply_microcode_amd(mc))
334 ucode_new_rev = mc->hdr.patch_id;
338 if (!ucode_cpio.data)
342 * AP has a different equivalence ID than BSP, looks like
343 * mixed-steppings silicon so go through the ucode blob anew.
345 apply_ucode_in_initrd(ucode_cpio.data, ucode_cpio.size, false);
350 int __init save_microcode_in_initrd_amd(void)
354 enum ucode_state ret;
363 cont = (unsigned long)container;
364 cont_va = __va(container);
367 * We need the physical address of the container for both bitness since
368 * boot_params.hdr.ramdisk_image is a physical address.
370 cont = __pa(container);
375 * Take into account the fact that the ramdisk might get relocated and
376 * therefore we need to recompute the container's position in virtual
379 if (relocated_ramdisk)
380 container = (u8 *)(__va(relocated_ramdisk) +
381 (cont - boot_params.hdr.ramdisk_image));
386 pr_info("microcode: updated early to new patch_level=0x%08x\n",
389 eax = cpuid_eax(0x00000001);
390 eax = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
392 ret = load_microcode_amd(smp_processor_id(), eax, container, container_size);
397 * This will be freed any msec now, stash patches for the current
398 * family and switch to patch cache for cpu hotplug, etc later.
406 void reload_ucode_amd(void)
408 struct microcode_amd *mc;
411 rdmsr(MSR_AMD64_PATCH_LEVEL, rev, eax);
413 mc = (struct microcode_amd *)amd_ucode_patch;
415 if (mc && rev < mc->hdr.patch_id) {
416 if (!__apply_microcode_amd(mc)) {
417 ucode_new_rev = mc->hdr.patch_id;
418 pr_info("microcode: reload patch_level=0x%08x\n",