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