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[linux-imx.git] / arch / x86 / kernel / microcode_amd.c
1 /*
2  *  AMD CPU Microcode Update Driver for Linux
3  *  Copyright (C) 2008-2011 Advanced Micro Devices Inc.
4  *
5  *  Author: Peter Oruba <peter.oruba@amd.com>
6  *
7  *  Based on work by:
8  *  Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
9  *
10  *  Maintainers:
11  *  Andreas Herrmann <herrmann.der.user@googlemail.com>
12  *  Borislav Petkov <bp@alien8.de>
13  *
14  *  This driver allows to upgrade microcode on F10h AMD
15  *  CPUs and later.
16  *
17  *  Licensed under the terms of the GNU General Public
18  *  License version 2. See file COPYING for details.
19  */
20
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <linux/firmware.h>
24 #include <linux/pci_ids.h>
25 #include <linux/uaccess.h>
26 #include <linux/vmalloc.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30
31 #include <asm/microcode.h>
32 #include <asm/processor.h>
33 #include <asm/msr.h>
34 #include <asm/microcode_amd.h>
35
36 MODULE_DESCRIPTION("AMD Microcode Update Driver");
37 MODULE_AUTHOR("Peter Oruba");
38 MODULE_LICENSE("GPL v2");
39
40 static struct equiv_cpu_entry *equiv_cpu_table;
41
42 struct ucode_patch {
43         struct list_head plist;
44         void *data;
45         u32 patch_id;
46         u16 equiv_cpu;
47 };
48
49 static LIST_HEAD(pcache);
50
51 static u16 __find_equiv_id(unsigned int cpu)
52 {
53         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
54         return find_equiv_id(equiv_cpu_table, uci->cpu_sig.sig);
55 }
56
57 static u32 find_cpu_family_by_equiv_cpu(u16 equiv_cpu)
58 {
59         int i = 0;
60
61         BUG_ON(!equiv_cpu_table);
62
63         while (equiv_cpu_table[i].equiv_cpu != 0) {
64                 if (equiv_cpu == equiv_cpu_table[i].equiv_cpu)
65                         return equiv_cpu_table[i].installed_cpu;
66                 i++;
67         }
68         return 0;
69 }
70
71 /*
72  * a small, trivial cache of per-family ucode patches
73  */
74 static struct ucode_patch *cache_find_patch(u16 equiv_cpu)
75 {
76         struct ucode_patch *p;
77
78         list_for_each_entry(p, &pcache, plist)
79                 if (p->equiv_cpu == equiv_cpu)
80                         return p;
81         return NULL;
82 }
83
84 static void update_cache(struct ucode_patch *new_patch)
85 {
86         struct ucode_patch *p;
87
88         list_for_each_entry(p, &pcache, plist) {
89                 if (p->equiv_cpu == new_patch->equiv_cpu) {
90                         if (p->patch_id >= new_patch->patch_id)
91                                 /* we already have the latest patch */
92                                 return;
93
94                         list_replace(&p->plist, &new_patch->plist);
95                         kfree(p->data);
96                         kfree(p);
97                         return;
98                 }
99         }
100         /* no patch found, add it */
101         list_add_tail(&new_patch->plist, &pcache);
102 }
103
104 static void free_cache(void)
105 {
106         struct ucode_patch *p, *tmp;
107
108         list_for_each_entry_safe(p, tmp, &pcache, plist) {
109                 __list_del(p->plist.prev, p->plist.next);
110                 kfree(p->data);
111                 kfree(p);
112         }
113 }
114
115 static struct ucode_patch *find_patch(unsigned int cpu)
116 {
117         u16 equiv_id;
118
119         equiv_id = __find_equiv_id(cpu);
120         if (!equiv_id)
121                 return NULL;
122
123         return cache_find_patch(equiv_id);
124 }
125
126 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
127 {
128         struct cpuinfo_x86 *c = &cpu_data(cpu);
129         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
130         struct ucode_patch *p;
131
132         csig->sig = cpuid_eax(0x00000001);
133         csig->rev = c->microcode;
134
135         /*
136          * a patch could have been loaded early, set uci->mc so that
137          * mc_bp_resume() can call apply_microcode()
138          */
139         p = find_patch(cpu);
140         if (p && (p->patch_id == csig->rev))
141                 uci->mc = p->data;
142
143         pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
144
145         return 0;
146 }
147
148 static unsigned int verify_patch_size(int cpu, u32 patch_size,
149                                       unsigned int size)
150 {
151         struct cpuinfo_x86 *c = &cpu_data(cpu);
152         u32 max_size;
153
154 #define F1XH_MPB_MAX_SIZE 2048
155 #define F14H_MPB_MAX_SIZE 1824
156 #define F15H_MPB_MAX_SIZE 4096
157 #define F16H_MPB_MAX_SIZE 3458
158
159         switch (c->x86) {
160         case 0x14:
161                 max_size = F14H_MPB_MAX_SIZE;
162                 break;
163         case 0x15:
164                 max_size = F15H_MPB_MAX_SIZE;
165                 break;
166         case 0x16:
167                 max_size = F16H_MPB_MAX_SIZE;
168                 break;
169         default:
170                 max_size = F1XH_MPB_MAX_SIZE;
171                 break;
172         }
173
174         if (patch_size > min_t(u32, size, max_size)) {
175                 pr_err("patch size mismatch\n");
176                 return 0;
177         }
178
179         return patch_size;
180 }
181
182 int __apply_microcode_amd(struct microcode_amd *mc_amd)
183 {
184         u32 rev, dummy;
185
186         wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
187
188         /* verify patch application was successful */
189         rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
190         if (rev != mc_amd->hdr.patch_id)
191                 return -1;
192
193         return 0;
194 }
195
196 int apply_microcode_amd(int cpu)
197 {
198         struct cpuinfo_x86 *c = &cpu_data(cpu);
199         struct microcode_amd *mc_amd;
200         struct ucode_cpu_info *uci;
201         struct ucode_patch *p;
202         u32 rev, dummy;
203
204         BUG_ON(raw_smp_processor_id() != cpu);
205
206         uci = ucode_cpu_info + cpu;
207
208         p = find_patch(cpu);
209         if (!p)
210                 return 0;
211
212         mc_amd  = p->data;
213         uci->mc = p->data;
214
215         rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
216
217         /* need to apply patch? */
218         if (rev >= mc_amd->hdr.patch_id) {
219                 c->microcode = rev;
220                 return 0;
221         }
222
223         if (__apply_microcode_amd(mc_amd)) {
224                 pr_err("CPU%d: update failed for patch_level=0x%08x\n",
225                         cpu, mc_amd->hdr.patch_id);
226                 return -1;
227         }
228         pr_info("CPU%d: new patch_level=0x%08x\n", cpu,
229                 mc_amd->hdr.patch_id);
230
231         uci->cpu_sig.rev = mc_amd->hdr.patch_id;
232         c->microcode = mc_amd->hdr.patch_id;
233
234         return 0;
235 }
236
237 static int install_equiv_cpu_table(const u8 *buf)
238 {
239         unsigned int *ibuf = (unsigned int *)buf;
240         unsigned int type = ibuf[1];
241         unsigned int size = ibuf[2];
242
243         if (type != UCODE_EQUIV_CPU_TABLE_TYPE || !size) {
244                 pr_err("empty section/"
245                        "invalid type field in container file section header\n");
246                 return -EINVAL;
247         }
248
249         equiv_cpu_table = vmalloc(size);
250         if (!equiv_cpu_table) {
251                 pr_err("failed to allocate equivalent CPU table\n");
252                 return -ENOMEM;
253         }
254
255         memcpy(equiv_cpu_table, buf + CONTAINER_HDR_SZ, size);
256
257         /* add header length */
258         return size + CONTAINER_HDR_SZ;
259 }
260
261 static void free_equiv_cpu_table(void)
262 {
263         vfree(equiv_cpu_table);
264         equiv_cpu_table = NULL;
265 }
266
267 static void cleanup(void)
268 {
269         free_equiv_cpu_table();
270         free_cache();
271 }
272
273 /*
274  * We return the current size even if some of the checks failed so that
275  * we can skip over the next patch. If we return a negative value, we
276  * signal a grave error like a memory allocation has failed and the
277  * driver cannot continue functioning normally. In such cases, we tear
278  * down everything we've used up so far and exit.
279  */
280 static int verify_and_add_patch(unsigned int cpu, u8 *fw, unsigned int leftover)
281 {
282         struct cpuinfo_x86 *c = &cpu_data(cpu);
283         struct microcode_header_amd *mc_hdr;
284         struct ucode_patch *patch;
285         unsigned int patch_size, crnt_size, ret;
286         u32 proc_fam;
287         u16 proc_id;
288
289         patch_size  = *(u32 *)(fw + 4);
290         crnt_size   = patch_size + SECTION_HDR_SIZE;
291         mc_hdr      = (struct microcode_header_amd *)(fw + SECTION_HDR_SIZE);
292         proc_id     = mc_hdr->processor_rev_id;
293
294         proc_fam = find_cpu_family_by_equiv_cpu(proc_id);
295         if (!proc_fam) {
296                 pr_err("No patch family for equiv ID: 0x%04x\n", proc_id);
297                 return crnt_size;
298         }
299
300         /* check if patch is for the current family */
301         proc_fam = ((proc_fam >> 8) & 0xf) + ((proc_fam >> 20) & 0xff);
302         if (proc_fam != c->x86)
303                 return crnt_size;
304
305         if (mc_hdr->nb_dev_id || mc_hdr->sb_dev_id) {
306                 pr_err("Patch-ID 0x%08x: chipset-specific code unsupported.\n",
307                         mc_hdr->patch_id);
308                 return crnt_size;
309         }
310
311         ret = verify_patch_size(cpu, patch_size, leftover);
312         if (!ret) {
313                 pr_err("Patch-ID 0x%08x: size mismatch.\n", mc_hdr->patch_id);
314                 return crnt_size;
315         }
316
317         patch = kzalloc(sizeof(*patch), GFP_KERNEL);
318         if (!patch) {
319                 pr_err("Patch allocation failure.\n");
320                 return -EINVAL;
321         }
322
323         patch->data = kzalloc(patch_size, GFP_KERNEL);
324         if (!patch->data) {
325                 pr_err("Patch data allocation failure.\n");
326                 kfree(patch);
327                 return -EINVAL;
328         }
329
330         /* All looks ok, copy patch... */
331         memcpy(patch->data, fw + SECTION_HDR_SIZE, patch_size);
332         INIT_LIST_HEAD(&patch->plist);
333         patch->patch_id  = mc_hdr->patch_id;
334         patch->equiv_cpu = proc_id;
335
336         /* ... and add to cache. */
337         update_cache(patch);
338
339         return crnt_size;
340 }
341
342 static enum ucode_state __load_microcode_amd(int cpu, const u8 *data, size_t size)
343 {
344         enum ucode_state ret = UCODE_ERROR;
345         unsigned int leftover;
346         u8 *fw = (u8 *)data;
347         int crnt_size = 0;
348         int offset;
349
350         offset = install_equiv_cpu_table(data);
351         if (offset < 0) {
352                 pr_err("failed to create equivalent cpu table\n");
353                 return ret;
354         }
355         fw += offset;
356         leftover = size - offset;
357
358         if (*(u32 *)fw != UCODE_UCODE_TYPE) {
359                 pr_err("invalid type field in container file section header\n");
360                 free_equiv_cpu_table();
361                 return ret;
362         }
363
364         while (leftover) {
365                 crnt_size = verify_and_add_patch(cpu, fw, leftover);
366                 if (crnt_size < 0)
367                         return ret;
368
369                 fw       += crnt_size;
370                 leftover -= crnt_size;
371         }
372
373         return UCODE_OK;
374 }
375
376 enum ucode_state load_microcode_amd(int cpu, const u8 *data, size_t size)
377 {
378         enum ucode_state ret;
379
380         /* free old equiv table */
381         free_equiv_cpu_table();
382
383         ret = __load_microcode_amd(cpu, data, size);
384
385         if (ret != UCODE_OK)
386                 cleanup();
387
388 #if defined(CONFIG_MICROCODE_AMD_EARLY) && defined(CONFIG_X86_32)
389         /* save BSP's matching patch for early load */
390         if (cpu_data(cpu).cpu_index == boot_cpu_data.cpu_index) {
391                 struct ucode_patch *p = find_patch(cpu);
392                 if (p) {
393                         memset(amd_bsp_mpb, 0, MPB_MAX_SIZE);
394                         memcpy(amd_bsp_mpb, p->data, min_t(u32, ksize(p->data),
395                                                            MPB_MAX_SIZE));
396                 }
397         }
398 #endif
399         return ret;
400 }
401
402 /*
403  * AMD microcode firmware naming convention, up to family 15h they are in
404  * the legacy file:
405  *
406  *    amd-ucode/microcode_amd.bin
407  *
408  * This legacy file is always smaller than 2K in size.
409  *
410  * Beginning with family 15h, they are in family-specific firmware files:
411  *
412  *    amd-ucode/microcode_amd_fam15h.bin
413  *    amd-ucode/microcode_amd_fam16h.bin
414  *    ...
415  *
416  * These might be larger than 2K.
417  */
418 static enum ucode_state request_microcode_amd(int cpu, struct device *device,
419                                               bool refresh_fw)
420 {
421         char fw_name[36] = "amd-ucode/microcode_amd.bin";
422         struct cpuinfo_x86 *c = &cpu_data(cpu);
423         enum ucode_state ret = UCODE_NFOUND;
424         const struct firmware *fw;
425
426         /* reload ucode container only on the boot cpu */
427         if (!refresh_fw || c->cpu_index != boot_cpu_data.cpu_index)
428                 return UCODE_OK;
429
430         if (c->x86 >= 0x15)
431                 snprintf(fw_name, sizeof(fw_name), "amd-ucode/microcode_amd_fam%.2xh.bin", c->x86);
432
433         if (request_firmware(&fw, (const char *)fw_name, device)) {
434                 pr_err("failed to load file %s\n", fw_name);
435                 goto out;
436         }
437
438         ret = UCODE_ERROR;
439         if (*(u32 *)fw->data != UCODE_MAGIC) {
440                 pr_err("invalid magic value (0x%08x)\n", *(u32 *)fw->data);
441                 goto fw_release;
442         }
443
444         ret = load_microcode_amd(cpu, fw->data, fw->size);
445
446  fw_release:
447         release_firmware(fw);
448
449  out:
450         return ret;
451 }
452
453 static enum ucode_state
454 request_microcode_user(int cpu, const void __user *buf, size_t size)
455 {
456         return UCODE_ERROR;
457 }
458
459 static void microcode_fini_cpu_amd(int cpu)
460 {
461         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
462
463         uci->mc = NULL;
464 }
465
466 static struct microcode_ops microcode_amd_ops = {
467         .request_microcode_user           = request_microcode_user,
468         .request_microcode_fw             = request_microcode_amd,
469         .collect_cpu_info                 = collect_cpu_info_amd,
470         .apply_microcode                  = apply_microcode_amd,
471         .microcode_fini_cpu               = microcode_fini_cpu_amd,
472 };
473
474 struct microcode_ops * __init init_amd_microcode(void)
475 {
476         struct cpuinfo_x86 *c = &cpu_data(0);
477
478         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
479                 pr_warning("AMD CPU family 0x%x not supported\n", c->x86);
480                 return NULL;
481         }
482
483         return &microcode_amd_ops;
484 }
485
486 void __exit exit_amd_microcode(void)
487 {
488         cleanup();
489 }