aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/microcode_amd.c
blob: 75538f64719300d2ed88e5a13de13df28fe1daf2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
/*
 *  AMD CPU Microcode Update Driver for Linux
 *  Copyright (C) 2008 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.
 *
 *  Licensed under the terms of the GNU General Public
 *  License version 2. See file COPYING for details.
 */
#include <linux/firmware.h>
#include <linux/pci_ids.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>

#include <asm/microcode.h>
#include <asm/processor.h>
#include <asm/msr.h>

MODULE_DESCRIPTION("AMD Microcode Update Driver");
MODULE_AUTHOR("Peter Oruba");
MODULE_LICENSE("GPL v2");

#define UCODE_MAGIC                0x00414d44
#define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
#define UCODE_UCODE_TYPE           0x00000001

const struct firmware *firmware;

struct equiv_cpu_entry {
	u32	installed_cpu;
	u32	fixed_errata_mask;
	u32	fixed_errata_compare;
	u16	equiv_cpu;
	u16	res;
} __attribute__((packed));

struct microcode_header_amd {
	u32	data_code;
	u32	patch_id;
	u16	mc_patch_data_id;
	u8	mc_patch_data_len;
	u8	init_flag;
	u32	mc_patch_data_checksum;
	u32	nb_dev_id;
	u32	sb_dev_id;
	u16	processor_rev_id;
	u8	nb_rev_id;
	u8	sb_rev_id;
	u8	bios_api_rev;
	u8	reserved1[3];
	u32	match_reg[8];
} __attribute__((packed));

struct microcode_amd {
	struct microcode_header_amd	hdr;
	unsigned int			mpb[0];
};

#define UCODE_MAX_SIZE			2048
#define UCODE_CONTAINER_SECTION_HDR	8
#define UCODE_CONTAINER_HEADER_SIZE	12

static struct equiv_cpu_entry *equiv_cpu_table;

static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
{
	struct cpuinfo_x86 *c = &cpu_data(cpu);
	u32 dummy;

	memset(csig, 0, sizeof(*csig));
	if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
		printk(KERN_WARNING "microcode: CPU%d: AMD CPU family 0x%x not "
		       "supported\n", cpu, c->x86);
		return -1;
	}
	rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
	printk(KERN_INFO "microcode: CPU%d: patch_level=0x%x\n", cpu, csig->rev);
	return 0;
}

static int get_matching_microcode(int cpu, void *mc, int rev)
{
	struct microcode_header_amd *mc_header = mc;
	unsigned int current_cpu_id;
	u16 equiv_cpu_id = 0;
	unsigned int 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;
		}
		i++;
	}

	if (!equiv_cpu_id) {
		printk(KERN_WARNING "microcode: CPU%d: cpu revision "
		       "not listed in equivalent cpu table\n", cpu);
		return 0;
	}

	if (mc_header->processor_rev_id != equiv_cpu_id)
		return 0;

	/* ucode might be chipset specific -- currently we don't support this */
	if (mc_header->nb_dev_id || mc_header->sb_dev_id) {
		printk(KERN_ERR "microcode: CPU%d: loading of chipset "
		       "specific code not yet supported\n", cpu);
		return 0;
	}

	if (mc_header->patch_id <= rev)
		return 0;

	return 1;
}

static int apply_microcode_amd(int cpu)
{
	u32 rev, dummy;
	int cpu_num = raw_smp_processor_id();
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
	struct microcode_amd *mc_amd = uci->mc;

	/* We should bind the task to the CPU */
	BUG_ON(cpu_num != cpu);

	if (mc_amd == NULL)
		return 0;

	wrmsrl(MSR_AMD64_PATCH_LOADER, (u64)(long)&mc_amd->hdr.data_code);
	/* get patch id after patching */
	rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);

	/* check current patch id and patch's id for match */
	if (rev != mc_amd->hdr.patch_id) {
		printk(KERN_ERR "microcode: CPU%d: update failed "
		       "(for patch_level=0x%x)\n", cpu, mc_amd->hdr.patch_id);
		return -1;
	}

	printk(KERN_INFO "microcode: CPU%d: updated (new patch_level=0x%x)\n",
	       cpu, rev);

	uci->cpu_sig.rev = rev;

	return 0;
}

static int get_ucode_data(void *to, const u8 *from, size_t n)
{
	memcpy(to, from, n);
	return 0;
}

static void *
get_next_ucode(const u8 *buf, unsigned int size, unsigned int *mc_size)
{
	unsigned int total_size;
	u8 section_hdr[UCODE_CONTAINER_SECTION_HDR];
	void *mc;

	if (get_ucode_data(section_hdr, buf, UCODE_CONTAINER_SECTION_HDR))
		return NULL;

	if (section_hdr[0] != UCODE_UCODE_TYPE) {
		printk(KERN_ERR "microcode: error: invalid type field in "
		       "container file section header\n");
		return NULL;
	}

	total_size = (unsigned long) (section_hdr[4] + (section_hdr[5] << 8));

	if (total_size > size || total_size > UCODE_MAX_SIZE) {
		printk(KERN_ERR "microcode: error: size mismatch\n");
		return NULL;
	}

	mc = vmalloc(UCODE_MAX_SIZE);
	if (mc) {
		memset(mc, 0, UCODE_MAX_SIZE);
		if (get_ucode_data(mc, buf + UCODE_CONTAINER_SECTION_HDR,
				   total_size)) {
			vfree(mc);
			mc = NULL;
		} else
			*mc_size = total_size + UCODE_CONTAINER_SECTION_HDR;
	}
	return mc;
}

static int install_equiv_cpu_table(const u8 *buf)
{
	u8 *container_hdr[UCODE_CONTAINER_HEADER_SIZE];
	unsigned int *buf_pos = (unsigned int *)container_hdr;
	unsigned long size;

	if (get_ucode_data(&container_hdr, buf, UCODE_CONTAINER_HEADER_SIZE))
		return 0;

	size = buf_pos[2];

	if (buf_pos[1] != UCODE_EQUIV_CPU_TABLE_TYPE || !size) {
		printk(KERN_ERR "microcode: error: invalid type field in "
		       "container file section header\n");
		return 0;
	}

	equiv_cpu_table = (struct equiv_cpu_entry *) vmalloc(size);
	if (!equiv_cpu_table) {
		printk(KERN_ERR "microcode: failed to allocate "
		       "equivalent CPU table\n");
		return 0;
	}

	buf += UCODE_CONTAINER_HEADER_SIZE;
	if (get_ucode_data(equiv_cpu_table, buf, size)) {
		vfree(equiv_cpu_table);
		return 0;
	}

	return size + UCODE_CONTAINER_HEADER_SIZE; /* add header length */
}

static void free_equiv_cpu_table(void)
{
	vfree(equiv_cpu_table);
	equiv_cpu_table = NULL;
}

static enum ucode_state
generic_load_microcode(int cpu, const u8 *data, size_t size)
{
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
	const u8 *ucode_ptr = data;
	void *new_mc = NULL;
	void *mc;
	int new_rev = uci->cpu_sig.rev;
	unsigned int leftover;
	unsigned long offset;
	enum ucode_state state = UCODE_OK;

	offset = install_equiv_cpu_table(ucode_ptr);
	if (!offset) {
		printk(KERN_ERR "microcode: failed to create "
		       "equivalent cpu table\n");
		return UCODE_ERROR;
	}

	ucode_ptr += offset;
	leftover = size - offset;

	while (leftover) {
		unsigned int uninitialized_var(mc_size);
		struct microcode_header_amd *mc_header;

		mc = get_next_ucode(ucode_ptr, leftover, &mc_size);
		if (!mc)
			break;

		mc_header = (struct microcode_header_amd *)mc;
		if (get_matching_microcode(cpu, mc, new_rev)) {
			vfree(new_mc);
			new_rev = mc_header->patch_id;
			new_mc  = mc;
		} else
			vfree(mc);

		ucode_ptr += mc_size;
		leftover  -= mc_size;
	}

	if (new_mc) {
		if (!leftover) {
			vfree(uci->mc);
			uci->mc = new_mc;
			pr_debug("microcode: CPU%d found a matching microcode "
				 "update with version 0x%x (current=0x%x)\n",
				 cpu, new_rev, uci->cpu_sig.rev);
		} else {
			vfree(new_mc);
			state = UCODE_ERROR;
		}
	} else
		state = UCODE_NFOUND;

	free_equiv_cpu_table();

	return state;
}

static enum ucode_state request_microcode_fw(int cpu, struct device *device)
{
	enum ucode_state ret;

	if (firmware == NULL)
		return UCODE_NFOUND;

	if (*(u32 *)firmware->data != UCODE_MAGIC) {
		printk(KERN_ERR "microcode: invalid UCODE_MAGIC (0x%08x)\n",
		       *(u32 *)firmware->data);
		return UCODE_ERROR;
	}

	ret = generic_load_microcode(cpu, firmware->data, firmware->size);

	return ret;
}

static enum ucode_state
request_microcode_user(int cpu, const void __user *buf, size_t size)
{
	printk(KERN_INFO "microcode: AMD microcode update via "
	       "/dev/cpu/microcode not supported\n");
	return UCODE_ERROR;
}

static void microcode_fini_cpu_amd(int cpu)
{
	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;

	vfree(uci->mc);
	uci->mc = NULL;
}

void init_microcode_amd(struct device *device)
{
	const char *fw_name = "amd-ucode/microcode_amd.bin";
	if (request_firmware(&firmware, fw_name, device))
		printk(KERN_ERR "microcode: failed to load file %s\n", fw_name);
}

void fini_microcode_amd(void)
{
	release_firmware(firmware);
}

static struct microcode_ops microcode_amd_ops = {
	.init				  = init_microcode_amd,
	.fini				  = fini_microcode_amd,
	.request_microcode_user           = request_microcode_user,
	.request_microcode_fw             = request_microcode_fw,
	.collect_cpu_info                 = collect_cpu_info_amd,
	.apply_microcode                  = apply_microcode_amd,
	.microcode_fini_cpu               = microcode_fini_cpu_amd,
};

struct microcode_ops * __init init_amd_microcode(void)
{
	return &microcode_amd_ops;
}