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Commit | Line | Data |
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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> |
13bfd47a | 34 | #include <linux/debugfs.h> |
31625340 | 35 | |
c9b77ccb | 36 | #include <asm/realmode.h> |
31625340 JC |
37 | #include <asm/processor.h> |
38 | #include <asm/bootparam.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/pgalloc.h> | |
b7f080cf | 41 | #include <asm/swiotlb.h> |
81e2d7b3 | 42 | #include <asm/fixmap.h> |
58c41d28 | 43 | #include <asm/proto.h> |
31625340 | 44 | #include <asm/setup.h> |
66441bd3 | 45 | #include <asm/e820/api.h> |
31625340 JC |
46 | #include <asm/io.h> |
47 | ||
bf8b88e9 | 48 | #include "../realmode/rm/wakeup.h" |
31625340 JC |
49 | |
50 | /* Global pointer to shared data; NULL means no measured launch. */ | |
51 | struct tboot *tboot __read_mostly; | |
cafd6659 | 52 | EXPORT_SYMBOL(tboot); |
31625340 JC |
53 | |
54 | /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */ | |
55 | #define AP_WAIT_TIMEOUT 1 | |
56 | ||
57 | #undef pr_fmt | |
58 | #define pr_fmt(fmt) "tboot: " fmt | |
59 | ||
60 | static u8 tboot_uuid[16] __initdata = TBOOT_UUID; | |
61 | ||
62 | void __init tboot_probe(void) | |
63 | { | |
64 | /* Look for valid page-aligned address for shared page. */ | |
65 | if (!boot_params.tboot_addr) | |
66 | return; | |
67 | /* | |
68 | * also verify that it is mapped as we expect it before calling | |
69 | * set_fixmap(), to reduce chance of garbage value causing crash | |
70 | */ | |
3bce64f0 | 71 | if (!e820__mapped_any(boot_params.tboot_addr, |
09821ff1 IM |
72 | boot_params.tboot_addr, E820_TYPE_RESERVED)) { |
73 | pr_warning("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n"); | |
31625340 JC |
74 | return; |
75 | } | |
76 | ||
31625340 JC |
77 | /* Map and check for tboot UUID. */ |
78 | set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr); | |
79 | tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE); | |
80 | if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) { | |
81 | pr_warning("tboot at 0x%llx is invalid\n", | |
82 | boot_params.tboot_addr); | |
83 | tboot = NULL; | |
84 | return; | |
85 | } | |
86 | if (tboot->version < 5) { | |
87 | pr_warning("tboot version is invalid: %u\n", tboot->version); | |
88 | tboot = NULL; | |
89 | return; | |
90 | } | |
91 | ||
92 | pr_info("found shared page at phys addr 0x%llx:\n", | |
93 | boot_params.tboot_addr); | |
94 | pr_debug("version: %d\n", tboot->version); | |
95 | pr_debug("log_addr: 0x%08x\n", tboot->log_addr); | |
96 | pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry); | |
97 | pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base); | |
98 | pr_debug("tboot_size: 0x%x\n", tboot->tboot_size); | |
99 | } | |
100 | ||
11520e5e LT |
101 | static pgd_t *tboot_pg_dir; |
102 | static struct mm_struct tboot_mm = { | |
103 | .mm_rb = RB_ROOT, | |
104 | .pgd = swapper_pg_dir, | |
105 | .mm_users = ATOMIC_INIT(2), | |
106 | .mm_count = ATOMIC_INIT(1), | |
107 | .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem), | |
108 | .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), | |
109 | .mmlist = LIST_HEAD_INIT(init_mm.mmlist), | |
110 | }; | |
111 | ||
31625340 JC |
112 | static inline void switch_to_tboot_pt(void) |
113 | { | |
11520e5e LT |
114 | write_cr3(virt_to_phys(tboot_pg_dir)); |
115 | } | |
116 | ||
117 | static int map_tboot_page(unsigned long vaddr, unsigned long pfn, | |
118 | pgprot_t prot) | |
119 | { | |
120 | pgd_t *pgd; | |
e0c4f675 | 121 | p4d_t *p4d; |
11520e5e LT |
122 | pud_t *pud; |
123 | pmd_t *pmd; | |
124 | pte_t *pte; | |
125 | ||
126 | pgd = pgd_offset(&tboot_mm, vaddr); | |
e0c4f675 KS |
127 | p4d = p4d_alloc(&tboot_mm, pgd, vaddr); |
128 | if (!p4d) | |
129 | return -1; | |
130 | pud = pud_alloc(&tboot_mm, p4d, vaddr); | |
11520e5e LT |
131 | if (!pud) |
132 | return -1; | |
133 | pmd = pmd_alloc(&tboot_mm, pud, vaddr); | |
134 | if (!pmd) | |
135 | return -1; | |
3ed3a4f0 | 136 | pte = pte_alloc_map(&tboot_mm, pmd, vaddr); |
11520e5e LT |
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 | ||
160 | static void tboot_create_trampoline(void) | |
161 | { | |
162 | u32 map_base, map_size; | |
163 | ||
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)) | |
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 | ||
bf495573 | 195 | for (i = 0; i < e820_table->nr_entries; i++) { |
09821ff1 IM |
196 | if ((e820_table->entries[i].type != E820_TYPE_RAM) |
197 | && (e820_table->entries[i].type != E820_TYPE_RESERVED_KERN)) | |
4bd96a7a | 198 | continue; |
62a3207b | 199 | |
bf495573 | 200 | add_mac_region(e820_table->entries[i].addr, e820_table->entries[i].size); |
4bd96a7a | 201 | } |
58c41d28 | 202 | |
c9b77ccb | 203 | tboot->acpi_sinfo.kernel_s3_resume_vector = |
b429dbf6 | 204 | real_mode_header->wakeup_start; |
58c41d28 PA |
205 | |
206 | return 0; | |
207 | } | |
208 | ||
209 | #else /* no CONFIG_ACPI_SLEEP */ | |
210 | ||
211 | static int tboot_setup_sleep(void) | |
212 | { | |
213 | /* S3 shutdown requested, but S3 not supported by the kernel... */ | |
214 | BUG(); | |
215 | return -1; | |
31625340 JC |
216 | } |
217 | ||
58c41d28 PA |
218 | #endif |
219 | ||
31625340 JC |
220 | void tboot_shutdown(u32 shutdown_type) |
221 | { | |
222 | void (*shutdown)(void); | |
223 | ||
224 | if (!tboot_enabled()) | |
225 | return; | |
226 | ||
11520e5e LT |
227 | /* |
228 | * if we're being called before the 1:1 mapping is set up then just | |
229 | * return and let the normal shutdown happen; this should only be | |
230 | * due to very early panic() | |
231 | */ | |
232 | if (!tboot_pg_dir) | |
233 | return; | |
234 | ||
31625340 JC |
235 | /* if this is S3 then set regions to MAC */ |
236 | if (shutdown_type == TB_SHUTDOWN_S3) | |
58c41d28 PA |
237 | if (tboot_setup_sleep()) |
238 | return; | |
31625340 JC |
239 | |
240 | tboot->shutdown_type = shutdown_type; | |
241 | ||
242 | switch_to_tboot_pt(); | |
243 | ||
244 | shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry; | |
245 | shutdown(); | |
246 | ||
247 | /* should not reach here */ | |
248 | while (1) | |
249 | halt(); | |
250 | } | |
251 | ||
252 | static void tboot_copy_fadt(const struct acpi_table_fadt *fadt) | |
253 | { | |
254 | #define TB_COPY_GAS(tbg, g) \ | |
255 | tbg.space_id = g.space_id; \ | |
256 | tbg.bit_width = g.bit_width; \ | |
257 | tbg.bit_offset = g.bit_offset; \ | |
258 | tbg.access_width = g.access_width; \ | |
259 | tbg.address = g.address; | |
260 | ||
261 | TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block); | |
262 | TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block); | |
263 | TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block); | |
264 | TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block); | |
265 | ||
266 | /* | |
267 | * We need phys addr of waking vector, but can't use virt_to_phys() on | |
268 | * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys | |
269 | * addr. | |
270 | */ | |
271 | tboot->acpi_sinfo.wakeup_vector = fadt->facs + | |
272 | offsetof(struct acpi_table_facs, firmware_waking_vector); | |
273 | } | |
274 | ||
a1f37788 | 275 | static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) |
31625340 JC |
276 | { |
277 | static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = { | |
278 | /* S0,1,2: */ -1, -1, -1, | |
279 | /* S3: */ TB_SHUTDOWN_S3, | |
280 | /* S4: */ TB_SHUTDOWN_S4, | |
281 | /* S5: */ TB_SHUTDOWN_S5 }; | |
282 | ||
283 | if (!tboot_enabled()) | |
a1f37788 | 284 | return 0; |
31625340 JC |
285 | |
286 | tboot_copy_fadt(&acpi_gbl_FADT); | |
287 | tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control; | |
288 | tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control; | |
289 | /* we always use the 32b wakeup vector */ | |
290 | tboot->acpi_sinfo.vector_width = 32; | |
31625340 JC |
291 | |
292 | if (sleep_state >= ACPI_S_STATE_COUNT || | |
293 | acpi_shutdown_map[sleep_state] == -1) { | |
294 | pr_warning("unsupported sleep state 0x%x\n", sleep_state); | |
a1f37788 | 295 | return -1; |
31625340 JC |
296 | } |
297 | ||
298 | tboot_shutdown(acpi_shutdown_map[sleep_state]); | |
09f98a82 TL |
299 | return 0; |
300 | } | |
31625340 | 301 | |
01c6a6af BG |
302 | static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b) |
303 | { | |
304 | if (!tboot_enabled()) | |
305 | return 0; | |
306 | ||
307 | pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)"); | |
308 | return -ENODEV; | |
309 | } | |
310 | ||
69575d38 SW |
311 | static atomic_t ap_wfs_count; |
312 | ||
313 | static int tboot_wait_for_aps(int num_aps) | |
31625340 JC |
314 | { |
315 | unsigned long timeout; | |
316 | ||
69575d38 SW |
317 | timeout = AP_WAIT_TIMEOUT*HZ; |
318 | while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps && | |
319 | timeout) { | |
320 | mdelay(1); | |
321 | timeout--; | |
322 | } | |
323 | ||
324 | if (timeout) | |
325 | pr_warning("tboot wait for APs timeout\n"); | |
326 | ||
327 | return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps); | |
328 | } | |
329 | ||
ae6a8a2e | 330 | static int tboot_dying_cpu(unsigned int cpu) |
69575d38 | 331 | { |
ae6a8a2e RC |
332 | atomic_inc(&ap_wfs_count); |
333 | if (num_online_cpus() == 1) { | |
334 | if (tboot_wait_for_aps(atomic_read(&ap_wfs_count))) | |
335 | return -EBUSY; | |
69575d38 | 336 | } |
ae6a8a2e | 337 | return 0; |
69575d38 SW |
338 | } |
339 | ||
13bfd47a QR |
340 | #ifdef CONFIG_DEBUG_FS |
341 | ||
342 | #define TBOOT_LOG_UUID { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \ | |
343 | 0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 } | |
344 | ||
345 | #define TBOOT_SERIAL_LOG_ADDR 0x60000 | |
346 | #define TBOOT_SERIAL_LOG_SIZE 0x08000 | |
347 | #define LOG_MAX_SIZE_OFF 16 | |
348 | #define LOG_BUF_OFF 24 | |
349 | ||
350 | static uint8_t tboot_log_uuid[16] = TBOOT_LOG_UUID; | |
351 | ||
352 | static ssize_t tboot_log_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) | |
353 | { | |
354 | void __iomem *log_base; | |
355 | u8 log_uuid[16]; | |
356 | u32 max_size; | |
357 | void *kbuf; | |
358 | int ret = -EFAULT; | |
359 | ||
360 | log_base = ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE); | |
361 | if (!log_base) | |
362 | return ret; | |
363 | ||
364 | memcpy_fromio(log_uuid, log_base, sizeof(log_uuid)); | |
365 | if (memcmp(&tboot_log_uuid, log_uuid, sizeof(log_uuid))) | |
366 | goto err_iounmap; | |
367 | ||
368 | max_size = readl(log_base + LOG_MAX_SIZE_OFF); | |
369 | if (*ppos >= max_size) { | |
370 | ret = 0; | |
371 | goto err_iounmap; | |
372 | } | |
373 | ||
374 | if (*ppos + count > max_size) | |
375 | count = max_size - *ppos; | |
376 | ||
377 | kbuf = kmalloc(count, GFP_KERNEL); | |
378 | if (!kbuf) { | |
379 | ret = -ENOMEM; | |
380 | goto err_iounmap; | |
381 | } | |
382 | ||
383 | memcpy_fromio(kbuf, log_base + LOG_BUF_OFF + *ppos, count); | |
384 | if (copy_to_user(user_buf, kbuf, count)) | |
385 | goto err_kfree; | |
386 | ||
387 | *ppos += count; | |
388 | ||
389 | ret = count; | |
390 | ||
391 | err_kfree: | |
392 | kfree(kbuf); | |
393 | ||
394 | err_iounmap: | |
395 | iounmap(log_base); | |
396 | ||
397 | return ret; | |
398 | } | |
399 | ||
400 | static const struct file_operations tboot_log_fops = { | |
401 | .read = tboot_log_read, | |
402 | .llseek = default_llseek, | |
403 | }; | |
404 | ||
405 | #endif /* CONFIG_DEBUG_FS */ | |
406 | ||
69575d38 SW |
407 | static __init int tboot_late_init(void) |
408 | { | |
31625340 JC |
409 | if (!tboot_enabled()) |
410 | return 0; | |
411 | ||
11520e5e LT |
412 | tboot_create_trampoline(); |
413 | ||
69575d38 | 414 | atomic_set(&ap_wfs_count, 0); |
73c1b41e | 415 | cpuhp_setup_state(CPUHP_AP_X86_TBOOT_DYING, "x86/tboot:dying", NULL, |
ae6a8a2e | 416 | tboot_dying_cpu); |
13bfd47a QR |
417 | #ifdef CONFIG_DEBUG_FS |
418 | debugfs_create_file("tboot_log", S_IRUSR, | |
419 | arch_debugfs_dir, NULL, &tboot_log_fops); | |
420 | #endif | |
421 | ||
a1f37788 | 422 | acpi_os_set_prepare_sleep(&tboot_sleep); |
01c6a6af | 423 | acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep); |
69575d38 | 424 | return 0; |
31625340 JC |
425 | } |
426 | ||
69575d38 SW |
427 | late_initcall(tboot_late_init); |
428 | ||
31625340 JC |
429 | /* |
430 | * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE) | |
431 | */ | |
432 | ||
433 | #define TXT_PUB_CONFIG_REGS_BASE 0xfed30000 | |
434 | #define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000 | |
435 | ||
436 | /* # pages for each config regs space - used by fixmap */ | |
437 | #define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \ | |
438 | TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT) | |
439 | ||
440 | /* offsets from pub/priv config space */ | |
441 | #define TXTCR_HEAP_BASE 0x0300 | |
442 | #define TXTCR_HEAP_SIZE 0x0308 | |
443 | ||
444 | #define SHA1_SIZE 20 | |
445 | ||
446 | struct sha1_hash { | |
447 | u8 hash[SHA1_SIZE]; | |
448 | }; | |
449 | ||
450 | struct sinit_mle_data { | |
451 | u32 version; /* currently 6 */ | |
452 | struct sha1_hash bios_acm_id; | |
453 | u32 edx_senter_flags; | |
454 | u64 mseg_valid; | |
455 | struct sha1_hash sinit_hash; | |
456 | struct sha1_hash mle_hash; | |
457 | struct sha1_hash stm_hash; | |
458 | struct sha1_hash lcp_policy_hash; | |
459 | u32 lcp_policy_control; | |
460 | u32 rlp_wakeup_addr; | |
461 | u32 reserved; | |
462 | u32 num_mdrs; | |
463 | u32 mdrs_off; | |
464 | u32 num_vtd_dmars; | |
465 | u32 vtd_dmars_off; | |
466 | } __packed; | |
467 | ||
468 | struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl) | |
469 | { | |
470 | void *heap_base, *heap_ptr, *config; | |
471 | ||
472 | if (!tboot_enabled()) | |
473 | return dmar_tbl; | |
474 | ||
475 | /* | |
476 | * ACPI tables may not be DMA protected by tboot, so use DMAR copy | |
477 | * SINIT saved in SinitMleData in TXT heap (which is DMA protected) | |
478 | */ | |
479 | ||
480 | /* map config space in order to get heap addr */ | |
481 | config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES * | |
482 | PAGE_SIZE); | |
483 | if (!config) | |
484 | return NULL; | |
485 | ||
486 | /* now map TXT heap */ | |
487 | heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE), | |
488 | *(u64 *)(config + TXTCR_HEAP_SIZE)); | |
489 | iounmap(config); | |
490 | if (!heap_base) | |
491 | return NULL; | |
492 | ||
493 | /* walk heap to SinitMleData */ | |
494 | /* skip BiosData */ | |
495 | heap_ptr = heap_base + *(u64 *)heap_base; | |
496 | /* skip OsMleData */ | |
497 | heap_ptr += *(u64 *)heap_ptr; | |
498 | /* skip OsSinitData */ | |
499 | heap_ptr += *(u64 *)heap_ptr; | |
500 | /* now points to SinitMleDataSize; set to SinitMleData */ | |
501 | heap_ptr += sizeof(u64); | |
502 | /* get addr of DMAR table */ | |
503 | dmar_tbl = (struct acpi_table_header *)(heap_ptr + | |
504 | ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off - | |
505 | sizeof(u64)); | |
506 | ||
507 | /* don't unmap heap because dmar.c needs access to this */ | |
508 | ||
509 | return dmar_tbl; | |
510 | } | |
511 | ||
512 | int tboot_force_iommu(void) | |
513 | { | |
514 | if (!tboot_enabled()) | |
515 | return 0; | |
516 | ||
bfd20f1c SL |
517 | if (!intel_iommu_tboot_noforce) |
518 | return 1; | |
519 | ||
31625340 JC |
520 | if (no_iommu || swiotlb || dmar_disabled) |
521 | pr_warning("Forcing Intel-IOMMU to enabled\n"); | |
522 | ||
523 | dmar_disabled = 0; | |
524 | #ifdef CONFIG_SWIOTLB | |
525 | swiotlb = 0; | |
526 | #endif | |
527 | no_iommu = 0; | |
528 | ||
529 | return 1; | |
530 | } |