diff options
Diffstat (limited to 'arch')
-rw-r--r-- | arch/x86/kernel/microcode_amd.c | 179 |
1 files changed, 93 insertions, 86 deletions
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index 9129c6981c5..384990d2c54 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c | |||
@@ -89,27 +89,76 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig) | |||
89 | return 0; | 89 | return 0; |
90 | } | 90 | } |
91 | 91 | ||
92 | static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr, | 92 | static unsigned int verify_ucode_size(int cpu, u32 patch_size, |
93 | int rev) | 93 | unsigned int size) |
94 | { | 94 | { |
95 | unsigned int current_cpu_id; | 95 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
96 | u16 equiv_cpu_id = 0; | 96 | u32 max_size; |
97 | unsigned int i = 0; | 97 | |
98 | #define F1XH_MPB_MAX_SIZE 2048 | ||
99 | #define F14H_MPB_MAX_SIZE 1824 | ||
100 | #define F15H_MPB_MAX_SIZE 4096 | ||
101 | |||
102 | switch (c->x86) { | ||
103 | case 0x14: | ||
104 | max_size = F14H_MPB_MAX_SIZE; | ||
105 | break; | ||
106 | case 0x15: | ||
107 | max_size = F15H_MPB_MAX_SIZE; | ||
108 | break; | ||
109 | default: | ||
110 | max_size = F1XH_MPB_MAX_SIZE; | ||
111 | break; | ||
112 | } | ||
113 | |||
114 | if (patch_size > min_t(u32, size, max_size)) { | ||
115 | pr_err("patch size mismatch\n"); | ||
116 | return 0; | ||
117 | } | ||
118 | |||
119 | return patch_size; | ||
120 | } | ||
121 | |||
122 | static u16 find_equiv_id(void) | ||
123 | { | ||
124 | unsigned int current_cpu_id, i = 0; | ||
98 | 125 | ||
99 | BUG_ON(equiv_cpu_table == NULL); | 126 | BUG_ON(equiv_cpu_table == NULL); |
127 | |||
100 | current_cpu_id = cpuid_eax(0x00000001); | 128 | current_cpu_id = cpuid_eax(0x00000001); |
101 | 129 | ||
102 | while (equiv_cpu_table[i].installed_cpu != 0) { | 130 | while (equiv_cpu_table[i].installed_cpu != 0) { |
103 | if (current_cpu_id == equiv_cpu_table[i].installed_cpu) { | 131 | if (current_cpu_id == equiv_cpu_table[i].installed_cpu) |
104 | equiv_cpu_id = equiv_cpu_table[i].equiv_cpu; | 132 | return equiv_cpu_table[i].equiv_cpu; |
105 | break; | 133 | |
106 | } | ||
107 | i++; | 134 | i++; |
108 | } | 135 | } |
136 | return 0; | ||
137 | } | ||
109 | 138 | ||
139 | /* | ||
140 | * we signal a good patch is found by returning its size > 0 | ||
141 | */ | ||
142 | static int get_matching_microcode(int cpu, const u8 *ucode_ptr, | ||
143 | unsigned int leftover_size, int rev, | ||
144 | unsigned int *current_size) | ||
145 | { | ||
146 | struct microcode_header_amd *mc_hdr; | ||
147 | unsigned int actual_size; | ||
148 | u16 equiv_cpu_id; | ||
149 | |||
150 | /* size of the current patch we're staring at */ | ||
151 | *current_size = *(u32 *)(ucode_ptr + 4) + SECTION_HDR_SIZE; | ||
152 | |||
153 | equiv_cpu_id = find_equiv_id(); | ||
110 | if (!equiv_cpu_id) | 154 | if (!equiv_cpu_id) |
111 | return 0; | 155 | return 0; |
112 | 156 | ||
157 | /* | ||
158 | * let's look at the patch header itself now | ||
159 | */ | ||
160 | mc_hdr = (struct microcode_header_amd *)(ucode_ptr + SECTION_HDR_SIZE); | ||
161 | |||
113 | if (mc_hdr->processor_rev_id != equiv_cpu_id) | 162 | if (mc_hdr->processor_rev_id != equiv_cpu_id) |
114 | return 0; | 163 | return 0; |
115 | 164 | ||
@@ -123,7 +172,20 @@ static int get_matching_microcode(int cpu, struct microcode_header_amd *mc_hdr, | |||
123 | if (mc_hdr->patch_id <= rev) | 172 | if (mc_hdr->patch_id <= rev) |
124 | return 0; | 173 | return 0; |
125 | 174 | ||
126 | return 1; | 175 | /* |
176 | * now that the header looks sane, verify its size | ||
177 | */ | ||
178 | actual_size = verify_ucode_size(cpu, *current_size, leftover_size); | ||
179 | if (!actual_size) | ||
180 | return 0; | ||
181 | |||
182 | /* clear the patch buffer */ | ||
183 | memset(patch, 0, PAGE_SIZE); | ||
184 | |||
185 | /* all looks ok, get the binary patch */ | ||
186 | get_ucode_data(patch, ucode_ptr + SECTION_HDR_SIZE, actual_size); | ||
187 | |||
188 | return actual_size; | ||
127 | } | 189 | } |
128 | 190 | ||
129 | static int apply_microcode_amd(int cpu) | 191 | static int apply_microcode_amd(int cpu) |
@@ -158,63 +220,6 @@ static int apply_microcode_amd(int cpu) | |||
158 | return 0; | 220 | return 0; |
159 | } | 221 | } |
160 | 222 | ||
161 | static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size) | ||
162 | { | ||
163 | struct cpuinfo_x86 *c = &cpu_data(cpu); | ||
164 | u32 max_size, actual_size; | ||
165 | |||
166 | #define F1XH_MPB_MAX_SIZE 2048 | ||
167 | #define F14H_MPB_MAX_SIZE 1824 | ||
168 | #define F15H_MPB_MAX_SIZE 4096 | ||
169 | |||
170 | switch (c->x86) { | ||
171 | case 0x14: | ||
172 | max_size = F14H_MPB_MAX_SIZE; | ||
173 | break; | ||
174 | case 0x15: | ||
175 | max_size = F15H_MPB_MAX_SIZE; | ||
176 | break; | ||
177 | default: | ||
178 | max_size = F1XH_MPB_MAX_SIZE; | ||
179 | break; | ||
180 | } | ||
181 | |||
182 | actual_size = *(u32 *)(buf + 4); | ||
183 | |||
184 | if (actual_size + SECTION_HDR_SIZE > size || actual_size > max_size) { | ||
185 | pr_err("section size mismatch\n"); | ||
186 | return 0; | ||
187 | } | ||
188 | |||
189 | return actual_size; | ||
190 | } | ||
191 | |||
192 | static struct microcode_header_amd * | ||
193 | get_next_ucode(int cpu, const u8 *buf, unsigned int size, unsigned int *mc_size) | ||
194 | { | ||
195 | struct microcode_header_amd *mc = NULL; | ||
196 | unsigned int actual_size = 0; | ||
197 | |||
198 | if (*(u32 *)buf != UCODE_UCODE_TYPE) { | ||
199 | pr_err("invalid type field in container file section header\n"); | ||
200 | goto out; | ||
201 | } | ||
202 | |||
203 | actual_size = verify_ucode_size(cpu, buf, size); | ||
204 | if (!actual_size) | ||
205 | goto out; | ||
206 | |||
207 | mc = vzalloc(actual_size); | ||
208 | if (!mc) | ||
209 | goto out; | ||
210 | |||
211 | get_ucode_data(mc, buf + SECTION_HDR_SIZE, actual_size); | ||
212 | *mc_size = actual_size + SECTION_HDR_SIZE; | ||
213 | |||
214 | out: | ||
215 | return mc; | ||
216 | } | ||
217 | |||
218 | static int install_equiv_cpu_table(const u8 *buf) | 223 | static int install_equiv_cpu_table(const u8 *buf) |
219 | { | 224 | { |
220 | unsigned int *ibuf = (unsigned int *)buf; | 225 | unsigned int *ibuf = (unsigned int *)buf; |
@@ -250,36 +255,38 @@ generic_load_microcode(int cpu, const u8 *data, size_t size) | |||
250 | { | 255 | { |
251 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; | 256 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; |
252 | struct microcode_header_amd *mc_hdr = NULL; | 257 | struct microcode_header_amd *mc_hdr = NULL; |
253 | unsigned int mc_size, leftover; | 258 | unsigned int mc_size, leftover, current_size = 0; |
254 | int offset; | 259 | int offset; |
255 | const u8 *ucode_ptr = data; | 260 | const u8 *ucode_ptr = data; |
256 | void *new_mc = NULL; | 261 | void *new_mc = NULL; |
257 | unsigned int new_rev = uci->cpu_sig.rev; | 262 | unsigned int new_rev = uci->cpu_sig.rev; |
258 | enum ucode_state state = UCODE_OK; | 263 | enum ucode_state state = UCODE_ERROR; |
259 | 264 | ||
260 | offset = install_equiv_cpu_table(ucode_ptr); | 265 | offset = install_equiv_cpu_table(ucode_ptr); |
261 | if (offset < 0) { | 266 | if (offset < 0) { |
262 | pr_err("failed to create equivalent cpu table\n"); | 267 | pr_err("failed to create equivalent cpu table\n"); |
263 | return UCODE_ERROR; | 268 | goto out; |
264 | } | 269 | } |
265 | |||
266 | ucode_ptr += offset; | 270 | ucode_ptr += offset; |
267 | leftover = size - offset; | 271 | leftover = size - offset; |
268 | 272 | ||
269 | while (leftover) { | 273 | if (*(u32 *)ucode_ptr != UCODE_UCODE_TYPE) { |
270 | mc_hdr = get_next_ucode(cpu, ucode_ptr, leftover, &mc_size); | 274 | pr_err("invalid type field in container file section header\n"); |
271 | if (!mc_hdr) | 275 | goto free_table; |
272 | break; | 276 | } |
273 | 277 | ||
274 | if (get_matching_microcode(cpu, mc_hdr, new_rev)) { | 278 | while (leftover) { |
275 | vfree(new_mc); | 279 | mc_size = get_matching_microcode(cpu, ucode_ptr, leftover, |
280 | new_rev, ¤t_size); | ||
281 | if (mc_size) { | ||
282 | mc_hdr = patch; | ||
283 | new_mc = patch; | ||
276 | new_rev = mc_hdr->patch_id; | 284 | new_rev = mc_hdr->patch_id; |
277 | new_mc = mc_hdr; | 285 | leftover -= mc_size; |
278 | } else | 286 | } else { |
279 | vfree(mc_hdr); | 287 | ucode_ptr += current_size; |
280 | 288 | leftover -= current_size; | |
281 | ucode_ptr += mc_size; | 289 | } |
282 | leftover -= mc_size; | ||
283 | } | 290 | } |
284 | 291 | ||
285 | if (!new_mc) { | 292 | if (!new_mc) { |
@@ -288,18 +295,19 @@ generic_load_microcode(int cpu, const u8 *data, size_t size) | |||
288 | } | 295 | } |
289 | 296 | ||
290 | if (!leftover) { | 297 | if (!leftover) { |
291 | vfree(uci->mc); | ||
292 | uci->mc = new_mc; | 298 | uci->mc = new_mc; |
299 | state = UCODE_OK; | ||
293 | pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n", | 300 | pr_debug("CPU%d update ucode (0x%08x -> 0x%08x)\n", |
294 | cpu, uci->cpu_sig.rev, new_rev); | 301 | cpu, uci->cpu_sig.rev, new_rev); |
295 | } else { | 302 | } else { |
296 | vfree(new_mc); | 303 | new_mc = NULL; |
297 | state = UCODE_ERROR; | 304 | state = UCODE_ERROR; |
298 | } | 305 | } |
299 | 306 | ||
300 | free_table: | 307 | free_table: |
301 | free_equiv_cpu_table(); | 308 | free_equiv_cpu_table(); |
302 | 309 | ||
310 | out: | ||
303 | return state; | 311 | return state; |
304 | } | 312 | } |
305 | 313 | ||
@@ -340,7 +348,6 @@ static void microcode_fini_cpu_amd(int cpu) | |||
340 | { | 348 | { |
341 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; | 349 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; |
342 | 350 | ||
343 | vfree(uci->mc); | ||
344 | uci->mc = NULL; | 351 | uci->mc = NULL; |
345 | } | 352 | } |
346 | 353 | ||