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31625340 JC |
1 | /* |
2 | * tboot.c: main implementation of helper functions used by kernel for | |
3 | * runtime support of Intel(R) Trusted Execution Technology | |
4 | * | |
5 | * Copyright (c) 2006-2009, Intel Corporation | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms and conditions of the GNU General Public License, | |
9 | * version 2, as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along with | |
17 | * this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/dma_remapping.h> | |
23 | #include <linux/init_task.h> | |
24 | #include <linux/spinlock.h> | |
69c60c88 | 25 | #include <linux/export.h> |
69575d38 | 26 | #include <linux/delay.h> |
31625340 JC |
27 | #include <linux/sched.h> |
28 | #include <linux/init.h> | |
29 | #include <linux/dmar.h> | |
69575d38 | 30 | #include <linux/cpu.h> |
31625340 JC |
31 | #include <linux/pfn.h> |
32 | #include <linux/mm.h> | |
69575d38 | 33 | #include <linux/tboot.h> |
31625340 | 34 | |
c9b77ccb | 35 | #include <asm/realmode.h> |
31625340 JC |
36 | #include <asm/processor.h> |
37 | #include <asm/bootparam.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/pgalloc.h> | |
b7f080cf | 40 | #include <asm/swiotlb.h> |
81e2d7b3 | 41 | #include <asm/fixmap.h> |
58c41d28 | 42 | #include <asm/proto.h> |
31625340 | 43 | #include <asm/setup.h> |
31625340 JC |
44 | #include <asm/e820.h> |
45 | #include <asm/io.h> | |
46 | ||
bf8b88e9 | 47 | #include "../realmode/rm/wakeup.h" |
31625340 JC |
48 | |
49 | /* Global pointer to shared data; NULL means no measured launch. */ | |
50 | struct tboot *tboot __read_mostly; | |
cafd6659 | 51 | EXPORT_SYMBOL(tboot); |
31625340 JC |
52 | |
53 | /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */ | |
54 | #define AP_WAIT_TIMEOUT 1 | |
55 | ||
56 | #undef pr_fmt | |
57 | #define pr_fmt(fmt) "tboot: " fmt | |
58 | ||
59 | static u8 tboot_uuid[16] __initdata = TBOOT_UUID; | |
60 | ||
61 | void __init tboot_probe(void) | |
62 | { | |
63 | /* Look for valid page-aligned address for shared page. */ | |
64 | if (!boot_params.tboot_addr) | |
65 | return; | |
66 | /* | |
67 | * also verify that it is mapped as we expect it before calling | |
68 | * set_fixmap(), to reduce chance of garbage value causing crash | |
69 | */ | |
70 | if (!e820_any_mapped(boot_params.tboot_addr, | |
71 | boot_params.tboot_addr, E820_RESERVED)) { | |
72 | pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n"); | |
73 | return; | |
74 | } | |
75 | ||
76 | /* only a natively booted kernel should be using TXT */ | |
77 | if (paravirt_enabled()) { | |
78 | pr_warning("non-0 tboot_addr but pv_ops is enabled\n"); | |
79 | return; | |
80 | } | |
81 | ||
82 | /* Map and check for tboot UUID. */ | |
83 | set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr); | |
84 | tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE); | |
85 | if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) { | |
86 | pr_warning("tboot at 0x%llx is invalid\n", | |
87 | boot_params.tboot_addr); | |
88 | tboot = NULL; | |
89 | return; | |
90 | } | |
91 | if (tboot->version < 5) { | |
92 | pr_warning("tboot version is invalid: %u\n", tboot->version); | |
93 | tboot = NULL; | |
94 | return; | |
95 | } | |
96 | ||
97 | pr_info("found shared page at phys addr 0x%llx:\n", | |
98 | boot_params.tboot_addr); | |
99 | pr_debug("version: %d\n", tboot->version); | |
100 | pr_debug("log_addr: 0x%08x\n", tboot->log_addr); | |
101 | pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry); | |
102 | pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base); | |
103 | pr_debug("tboot_size: 0x%x\n", tboot->tboot_size); | |
104 | } | |
105 | ||
106 | static pgd_t *tboot_pg_dir; | |
107 | static struct mm_struct tboot_mm = { | |
108 | .mm_rb = RB_ROOT, | |
109 | .pgd = swapper_pg_dir, | |
110 | .mm_users = ATOMIC_INIT(2), | |
111 | .mm_count = ATOMIC_INIT(1), | |
112 | .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), | |
113 | .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), | |
114 | .mmlist = LIST_HEAD_INIT(init_mm.mmlist), | |
31625340 JC |
115 | }; |
116 | ||
117 | static inline void switch_to_tboot_pt(void) | |
118 | { | |
119 | write_cr3(virt_to_phys(tboot_pg_dir)); | |
120 | } | |
121 | ||
122 | static int map_tboot_page(unsigned long vaddr, unsigned long pfn, | |
123 | pgprot_t prot) | |
124 | { | |
125 | pgd_t *pgd; | |
126 | pud_t *pud; | |
127 | pmd_t *pmd; | |
128 | pte_t *pte; | |
129 | ||
130 | pgd = pgd_offset(&tboot_mm, vaddr); | |
131 | pud = pud_alloc(&tboot_mm, pgd, vaddr); | |
132 | if (!pud) | |
133 | return -1; | |
134 | pmd = pmd_alloc(&tboot_mm, pud, vaddr); | |
135 | if (!pmd) | |
136 | return -1; | |
8ac1f832 | 137 | pte = pte_alloc_map(&tboot_mm, NULL, pmd, vaddr); |
31625340 JC |
138 | if (!pte) |
139 | return -1; | |
140 | set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot)); | |
141 | pte_unmap(pte); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn, | |
146 | unsigned long nr) | |
147 | { | |
148 | /* Reuse the original kernel mapping */ | |
149 | tboot_pg_dir = pgd_alloc(&tboot_mm); | |
150 | if (!tboot_pg_dir) | |
151 | return -1; | |
152 | ||
153 | for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) { | |
154 | if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC)) | |
155 | return -1; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
69575d38 | 161 | static void tboot_create_trampoline(void) |
31625340 JC |
162 | { |
163 | u32 map_base, map_size; | |
164 | ||
31625340 JC |
165 | /* Create identity map for tboot shutdown code. */ |
166 | map_base = PFN_DOWN(tboot->tboot_base); | |
167 | map_size = PFN_UP(tboot->tboot_size); | |
168 | if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size)) | |
58c41d28 PA |
169 | panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", |
170 | map_base, map_size); | |
31625340 JC |
171 | } |
172 | ||
58c41d28 PA |
173 | #ifdef CONFIG_ACPI_SLEEP |
174 | ||
175 | static void add_mac_region(phys_addr_t start, unsigned long size) | |
31625340 | 176 | { |
58c41d28 PA |
177 | struct tboot_mac_region *mr; |
178 | phys_addr_t end = start + size; | |
179 | ||
4bd96a7a SW |
180 | if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS) |
181 | panic("tboot: Too many MAC regions\n"); | |
182 | ||
58c41d28 PA |
183 | if (start && size) { |
184 | mr = &tboot->mac_regions[tboot->num_mac_regions++]; | |
185 | mr->start = round_down(start, PAGE_SIZE); | |
186 | mr->size = round_up(end, PAGE_SIZE) - mr->start; | |
187 | } | |
188 | } | |
189 | ||
190 | static int tboot_setup_sleep(void) | |
191 | { | |
4bd96a7a SW |
192 | int i; |
193 | ||
58c41d28 PA |
194 | tboot->num_mac_regions = 0; |
195 | ||
4bd96a7a SW |
196 | for (i = 0; i < e820.nr_map; i++) { |
197 | if ((e820.map[i].type != E820_RAM) | |
198 | && (e820.map[i].type != E820_RESERVED_KERN)) | |
199 | continue; | |
62a3207b | 200 | |
4bd96a7a SW |
201 | add_mac_region(e820.map[i].addr, e820.map[i].size); |
202 | } | |
58c41d28 | 203 | |
c9b77ccb | 204 | tboot->acpi_sinfo.kernel_s3_resume_vector = |
b429dbf6 | 205 | real_mode_header->wakeup_start; |
58c41d28 PA |
206 | |
207 | return 0; | |
208 | } | |
209 | ||
210 | #else /* no CONFIG_ACPI_SLEEP */ | |
211 | ||
212 | static int tboot_setup_sleep(void) | |
213 | { | |
214 | /* S3 shutdown requested, but S3 not supported by the kernel... */ | |
215 | BUG(); | |
216 | return -1; | |
31625340 JC |
217 | } |
218 | ||
58c41d28 PA |
219 | #endif |
220 | ||
31625340 JC |
221 | void tboot_shutdown(u32 shutdown_type) |
222 | { | |
223 | void (*shutdown)(void); | |
224 | ||
225 | if (!tboot_enabled()) | |
226 | return; | |
227 | ||
228 | /* | |
229 | * if we're being called before the 1:1 mapping is set up then just | |
230 | * return and let the normal shutdown happen; this should only be | |
231 | * due to very early panic() | |
232 | */ | |
233 | if (!tboot_pg_dir) | |
234 | return; | |
235 | ||
236 | /* if this is S3 then set regions to MAC */ | |
237 | if (shutdown_type == TB_SHUTDOWN_S3) | |
58c41d28 PA |
238 | if (tboot_setup_sleep()) |
239 | return; | |
31625340 JC |
240 | |
241 | tboot->shutdown_type = shutdown_type; | |
242 | ||
243 | switch_to_tboot_pt(); | |
244 | ||
245 | shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry; | |
246 | shutdown(); | |
247 | ||
248 | /* should not reach here */ | |
249 | while (1) | |
250 | halt(); | |
251 | } | |
252 | ||
253 | static void tboot_copy_fadt(const struct acpi_table_fadt *fadt) | |
254 | { | |
255 | #define TB_COPY_GAS(tbg, g) \ | |
256 | tbg.space_id = g.space_id; \ | |
257 | tbg.bit_width = g.bit_width; \ | |
258 | tbg.bit_offset = g.bit_offset; \ | |
259 | tbg.access_width = g.access_width; \ | |
260 | tbg.address = g.address; | |
261 | ||
262 | TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block); | |
263 | TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block); | |
264 | TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block); | |
265 | TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block); | |
266 | ||
267 | /* | |
268 | * We need phys addr of waking vector, but can't use virt_to_phys() on | |
269 | * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys | |
270 | * addr. | |
271 | */ | |
272 | tboot->acpi_sinfo.wakeup_vector = fadt->facs + | |
273 | offsetof(struct acpi_table_facs, firmware_waking_vector); | |
274 | } | |
275 | ||
a1f37788 | 276 | static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) |
31625340 JC |
277 | { |
278 | static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = { | |
279 | /* S0,1,2: */ -1, -1, -1, | |
280 | /* S3: */ TB_SHUTDOWN_S3, | |
281 | /* S4: */ TB_SHUTDOWN_S4, | |
282 | /* S5: */ TB_SHUTDOWN_S5 }; | |
283 | ||
284 | if (!tboot_enabled()) | |
a1f37788 | 285 | return 0; |
31625340 JC |
286 | |
287 | tboot_copy_fadt(&acpi_gbl_FADT); | |
288 | tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control; | |
289 | tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control; | |
290 | /* we always use the 32b wakeup vector */ | |
291 | tboot->acpi_sinfo.vector_width = 32; | |
31625340 JC |
292 | |
293 | if (sleep_state >= ACPI_S_STATE_COUNT || | |
294 | acpi_shutdown_map[sleep_state] == -1) { | |
295 | pr_warning("unsupported sleep state 0x%x\n", sleep_state); | |
a1f37788 | 296 | return -1; |
31625340 JC |
297 | } |
298 | ||
299 | tboot_shutdown(acpi_shutdown_map[sleep_state]); | |
09f98a82 TL |
300 | return 0; |
301 | } | |
31625340 | 302 | |
69575d38 SW |
303 | static atomic_t ap_wfs_count; |
304 | ||
305 | static int tboot_wait_for_aps(int num_aps) | |
31625340 JC |
306 | { |
307 | unsigned long timeout; | |
308 | ||
69575d38 SW |
309 | timeout = AP_WAIT_TIMEOUT*HZ; |
310 | while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps && | |
311 | timeout) { | |
312 | mdelay(1); | |
313 | timeout--; | |
314 | } | |
315 | ||
316 | if (timeout) | |
317 | pr_warning("tboot wait for APs timeout\n"); | |
318 | ||
319 | return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps); | |
320 | } | |
321 | ||
322 | static int __cpuinit tboot_cpu_callback(struct notifier_block *nfb, | |
323 | unsigned long action, void *hcpu) | |
324 | { | |
325 | switch (action) { | |
326 | case CPU_DYING: | |
327 | atomic_inc(&ap_wfs_count); | |
328 | if (num_online_cpus() == 1) | |
329 | if (tboot_wait_for_aps(atomic_read(&ap_wfs_count))) | |
330 | return NOTIFY_BAD; | |
331 | break; | |
332 | } | |
333 | return NOTIFY_OK; | |
334 | } | |
335 | ||
336 | static struct notifier_block tboot_cpu_notifier __cpuinitdata = | |
337 | { | |
338 | .notifier_call = tboot_cpu_callback, | |
339 | }; | |
340 | ||
341 | static __init int tboot_late_init(void) | |
342 | { | |
31625340 JC |
343 | if (!tboot_enabled()) |
344 | return 0; | |
345 | ||
69575d38 | 346 | tboot_create_trampoline(); |
31625340 | 347 | |
69575d38 SW |
348 | atomic_set(&ap_wfs_count, 0); |
349 | register_hotcpu_notifier(&tboot_cpu_notifier); | |
09f98a82 | 350 | |
a1f37788 | 351 | acpi_os_set_prepare_sleep(&tboot_sleep); |
69575d38 | 352 | return 0; |
31625340 JC |
353 | } |
354 | ||
69575d38 SW |
355 | late_initcall(tboot_late_init); |
356 | ||
31625340 JC |
357 | /* |
358 | * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE) | |
359 | */ | |
360 | ||
361 | #define TXT_PUB_CONFIG_REGS_BASE 0xfed30000 | |
362 | #define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000 | |
363 | ||
364 | /* # pages for each config regs space - used by fixmap */ | |
365 | #define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \ | |
366 | TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT) | |
367 | ||
368 | /* offsets from pub/priv config space */ | |
369 | #define TXTCR_HEAP_BASE 0x0300 | |
370 | #define TXTCR_HEAP_SIZE 0x0308 | |
371 | ||
372 | #define SHA1_SIZE 20 | |
373 | ||
374 | struct sha1_hash { | |
375 | u8 hash[SHA1_SIZE]; | |
376 | }; | |
377 | ||
378 | struct sinit_mle_data { | |
379 | u32 version; /* currently 6 */ | |
380 | struct sha1_hash bios_acm_id; | |
381 | u32 edx_senter_flags; | |
382 | u64 mseg_valid; | |
383 | struct sha1_hash sinit_hash; | |
384 | struct sha1_hash mle_hash; | |
385 | struct sha1_hash stm_hash; | |
386 | struct sha1_hash lcp_policy_hash; | |
387 | u32 lcp_policy_control; | |
388 | u32 rlp_wakeup_addr; | |
389 | u32 reserved; | |
390 | u32 num_mdrs; | |
391 | u32 mdrs_off; | |
392 | u32 num_vtd_dmars; | |
393 | u32 vtd_dmars_off; | |
394 | } __packed; | |
395 | ||
396 | struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl) | |
397 | { | |
398 | void *heap_base, *heap_ptr, *config; | |
399 | ||
400 | if (!tboot_enabled()) | |
401 | return dmar_tbl; | |
402 | ||
403 | /* | |
404 | * ACPI tables may not be DMA protected by tboot, so use DMAR copy | |
405 | * SINIT saved in SinitMleData in TXT heap (which is DMA protected) | |
406 | */ | |
407 | ||
408 | /* map config space in order to get heap addr */ | |
409 | config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES * | |
410 | PAGE_SIZE); | |
411 | if (!config) | |
412 | return NULL; | |
413 | ||
414 | /* now map TXT heap */ | |
415 | heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE), | |
416 | *(u64 *)(config + TXTCR_HEAP_SIZE)); | |
417 | iounmap(config); | |
418 | if (!heap_base) | |
419 | return NULL; | |
420 | ||
421 | /* walk heap to SinitMleData */ | |
422 | /* skip BiosData */ | |
423 | heap_ptr = heap_base + *(u64 *)heap_base; | |
424 | /* skip OsMleData */ | |
425 | heap_ptr += *(u64 *)heap_ptr; | |
426 | /* skip OsSinitData */ | |
427 | heap_ptr += *(u64 *)heap_ptr; | |
428 | /* now points to SinitMleDataSize; set to SinitMleData */ | |
429 | heap_ptr += sizeof(u64); | |
430 | /* get addr of DMAR table */ | |
431 | dmar_tbl = (struct acpi_table_header *)(heap_ptr + | |
432 | ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off - | |
433 | sizeof(u64)); | |
434 | ||
435 | /* don't unmap heap because dmar.c needs access to this */ | |
436 | ||
437 | return dmar_tbl; | |
438 | } | |
439 | ||
440 | int tboot_force_iommu(void) | |
441 | { | |
442 | if (!tboot_enabled()) | |
443 | return 0; | |
444 | ||
445 | if (no_iommu || swiotlb || dmar_disabled) | |
446 | pr_warning("Forcing Intel-IOMMU to enabled\n"); | |
447 | ||
448 | dmar_disabled = 0; | |
449 | #ifdef CONFIG_SWIOTLB | |
450 | swiotlb = 0; | |
451 | #endif | |
452 | no_iommu = 0; | |
453 | ||
454 | return 1; | |
455 | } |