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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * tboot.c: main implementation of helper functions used by kernel for
4 * runtime support of Intel(R) Trusted Execution Technology
5 *
6 * Copyright (c) 2006-2009, Intel Corporation
7 */
8
9#include <linux/intel-iommu.h>
10#include <linux/init_task.h>
11#include <linux/spinlock.h>
12#include <linux/export.h>
13#include <linux/delay.h>
14#include <linux/sched.h>
15#include <linux/init.h>
16#include <linux/dmar.h>
17#include <linux/cpu.h>
18#include <linux/pfn.h>
19#include <linux/mm.h>
20#include <linux/tboot.h>
21#include <linux/debugfs.h>
22
23#include <asm/realmode.h>
24#include <asm/processor.h>
25#include <asm/bootparam.h>
26#include <asm/pgtable.h>
27#include <asm/pgalloc.h>
28#include <asm/swiotlb.h>
29#include <asm/fixmap.h>
30#include <asm/proto.h>
31#include <asm/setup.h>
32#include <asm/e820/api.h>
33#include <asm/io.h>
34
35#include "../realmode/rm/wakeup.h"
36
37/* Global pointer to shared data; NULL means no measured launch. */
38struct tboot *tboot __read_mostly;
39EXPORT_SYMBOL(tboot);
40
41/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
42#define AP_WAIT_TIMEOUT 1
43
44#undef pr_fmt
45#define pr_fmt(fmt) "tboot: " fmt
46
47static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
48
49void __init tboot_probe(void)
50{
51 /* Look for valid page-aligned address for shared page. */
52 if (!boot_params.tboot_addr)
53 return;
54 /*
55 * also verify that it is mapped as we expect it before calling
56 * set_fixmap(), to reduce chance of garbage value causing crash
57 */
58 if (!e820__mapped_any(boot_params.tboot_addr,
59 boot_params.tboot_addr, E820_TYPE_RESERVED)) {
60 pr_warning("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n");
61 return;
62 }
63
64 /* Map and check for tboot UUID. */
65 set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
66 tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
67 if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
68 pr_warning("tboot at 0x%llx is invalid\n",
69 boot_params.tboot_addr);
70 tboot = NULL;
71 return;
72 }
73 if (tboot->version < 5) {
74 pr_warning("tboot version is invalid: %u\n", tboot->version);
75 tboot = NULL;
76 return;
77 }
78
79 pr_info("found shared page at phys addr 0x%llx:\n",
80 boot_params.tboot_addr);
81 pr_debug("version: %d\n", tboot->version);
82 pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
83 pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
84 pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
85 pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
86}
87
88static pgd_t *tboot_pg_dir;
89static struct mm_struct tboot_mm = {
90 .mm_rb = RB_ROOT,
91 .pgd = swapper_pg_dir,
92 .mm_users = ATOMIC_INIT(2),
93 .mm_count = ATOMIC_INIT(1),
94 .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
95 .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
96 .mmlist = LIST_HEAD_INIT(init_mm.mmlist),
97};
98
99static inline void switch_to_tboot_pt(void)
100{
101 write_cr3(virt_to_phys(tboot_pg_dir));
102}
103
104static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
105 pgprot_t prot)
106{
107 pgd_t *pgd;
108 p4d_t *p4d;
109 pud_t *pud;
110 pmd_t *pmd;
111 pte_t *pte;
112
113 pgd = pgd_offset(&tboot_mm, vaddr);
114 p4d = p4d_alloc(&tboot_mm, pgd, vaddr);
115 if (!p4d)
116 return -1;
117 pud = pud_alloc(&tboot_mm, p4d, vaddr);
118 if (!pud)
119 return -1;
120 pmd = pmd_alloc(&tboot_mm, pud, vaddr);
121 if (!pmd)
122 return -1;
123 pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
124 if (!pte)
125 return -1;
126 set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
127 pte_unmap(pte);
128
129 /*
130 * PTI poisons low addresses in the kernel page tables in the
131 * name of making them unusable for userspace. To execute
132 * code at such a low address, the poison must be cleared.
133 *
134 * Note: 'pgd' actually gets set in p4d_alloc() _or_
135 * pud_alloc() depending on 4/5-level paging.
136 */
137 pgd->pgd &= ~_PAGE_NX;
138
139 return 0;
140}
141
142static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
143 unsigned long nr)
144{
145 /* Reuse the original kernel mapping */
146 tboot_pg_dir = pgd_alloc(&tboot_mm);
147 if (!tboot_pg_dir)
148 return -1;
149
150 for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
151 if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
152 return -1;
153 }
154
155 return 0;
156}
157
158static void tboot_create_trampoline(void)
159{
160 u32 map_base, map_size;
161
162 /* Create identity map for tboot shutdown code. */
163 map_base = PFN_DOWN(tboot->tboot_base);
164 map_size = PFN_UP(tboot->tboot_size);
165 if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
166 panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
167 map_base, map_size);
168}
169
170#ifdef CONFIG_ACPI_SLEEP
171
172static void add_mac_region(phys_addr_t start, unsigned long size)
173{
174 struct tboot_mac_region *mr;
175 phys_addr_t end = start + size;
176
177 if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS)
178 panic("tboot: Too many MAC regions\n");
179
180 if (start && size) {
181 mr = &tboot->mac_regions[tboot->num_mac_regions++];
182 mr->start = round_down(start, PAGE_SIZE);
183 mr->size = round_up(end, PAGE_SIZE) - mr->start;
184 }
185}
186
187static int tboot_setup_sleep(void)
188{
189 int i;
190
191 tboot->num_mac_regions = 0;
192
193 for (i = 0; i < e820_table->nr_entries; i++) {
194 if ((e820_table->entries[i].type != E820_TYPE_RAM)
195 && (e820_table->entries[i].type != E820_TYPE_RESERVED_KERN))
196 continue;
197
198 add_mac_region(e820_table->entries[i].addr, e820_table->entries[i].size);
199 }
200
201 tboot->acpi_sinfo.kernel_s3_resume_vector =
202 real_mode_header->wakeup_start;
203
204 return 0;
205}
206
207#else /* no CONFIG_ACPI_SLEEP */
208
209static int tboot_setup_sleep(void)
210{
211 /* S3 shutdown requested, but S3 not supported by the kernel... */
212 BUG();
213 return -1;
214}
215
216#endif
217
218void tboot_shutdown(u32 shutdown_type)
219{
220 void (*shutdown)(void);
221
222 if (!tboot_enabled())
223 return;
224
225 /*
226 * if we're being called before the 1:1 mapping is set up then just
227 * return and let the normal shutdown happen; this should only be
228 * due to very early panic()
229 */
230 if (!tboot_pg_dir)
231 return;
232
233 /* if this is S3 then set regions to MAC */
234 if (shutdown_type == TB_SHUTDOWN_S3)
235 if (tboot_setup_sleep())
236 return;
237
238 tboot->shutdown_type = shutdown_type;
239
240 switch_to_tboot_pt();
241
242 shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
243 shutdown();
244
245 /* should not reach here */
246 while (1)
247 halt();
248}
249
250static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
251{
252#define TB_COPY_GAS(tbg, g) \
253 tbg.space_id = g.space_id; \
254 tbg.bit_width = g.bit_width; \
255 tbg.bit_offset = g.bit_offset; \
256 tbg.access_width = g.access_width; \
257 tbg.address = g.address;
258
259 TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
260 TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
261 TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
262 TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
263
264 /*
265 * We need phys addr of waking vector, but can't use virt_to_phys() on
266 * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
267 * addr.
268 */
269 tboot->acpi_sinfo.wakeup_vector = fadt->facs +
270 offsetof(struct acpi_table_facs, firmware_waking_vector);
271}
272
273static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
274{
275 static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
276 /* S0,1,2: */ -1, -1, -1,
277 /* S3: */ TB_SHUTDOWN_S3,
278 /* S4: */ TB_SHUTDOWN_S4,
279 /* S5: */ TB_SHUTDOWN_S5 };
280
281 if (!tboot_enabled())
282 return 0;
283
284 tboot_copy_fadt(&acpi_gbl_FADT);
285 tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
286 tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
287 /* we always use the 32b wakeup vector */
288 tboot->acpi_sinfo.vector_width = 32;
289
290 if (sleep_state >= ACPI_S_STATE_COUNT ||
291 acpi_shutdown_map[sleep_state] == -1) {
292 pr_warning("unsupported sleep state 0x%x\n", sleep_state);
293 return -1;
294 }
295
296 tboot_shutdown(acpi_shutdown_map[sleep_state]);
297 return 0;
298}
299
300static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b)
301{
302 if (!tboot_enabled())
303 return 0;
304
305 pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
306 return -ENODEV;
307}
308
309static atomic_t ap_wfs_count;
310
311static int tboot_wait_for_aps(int num_aps)
312{
313 unsigned long timeout;
314
315 timeout = AP_WAIT_TIMEOUT*HZ;
316 while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
317 timeout) {
318 mdelay(1);
319 timeout--;
320 }
321
322 if (timeout)
323 pr_warning("tboot wait for APs timeout\n");
324
325 return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
326}
327
328static int tboot_dying_cpu(unsigned int cpu)
329{
330 atomic_inc(&ap_wfs_count);
331 if (num_online_cpus() == 1) {
332 if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
333 return -EBUSY;
334 }
335 return 0;
336}
337
338#ifdef CONFIG_DEBUG_FS
339
340#define TBOOT_LOG_UUID { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \
341 0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 }
342
343#define TBOOT_SERIAL_LOG_ADDR 0x60000
344#define TBOOT_SERIAL_LOG_SIZE 0x08000
345#define LOG_MAX_SIZE_OFF 16
346#define LOG_BUF_OFF 24
347
348static uint8_t tboot_log_uuid[16] = TBOOT_LOG_UUID;
349
350static ssize_t tboot_log_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos)
351{
352 void __iomem *log_base;
353 u8 log_uuid[16];
354 u32 max_size;
355 void *kbuf;
356 int ret = -EFAULT;
357
358 log_base = ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
359 if (!log_base)
360 return ret;
361
362 memcpy_fromio(log_uuid, log_base, sizeof(log_uuid));
363 if (memcmp(&tboot_log_uuid, log_uuid, sizeof(log_uuid)))
364 goto err_iounmap;
365
366 max_size = readl(log_base + LOG_MAX_SIZE_OFF);
367 if (*ppos >= max_size) {
368 ret = 0;
369 goto err_iounmap;
370 }
371
372 if (*ppos + count > max_size)
373 count = max_size - *ppos;
374
375 kbuf = kmalloc(count, GFP_KERNEL);
376 if (!kbuf) {
377 ret = -ENOMEM;
378 goto err_iounmap;
379 }
380
381 memcpy_fromio(kbuf, log_base + LOG_BUF_OFF + *ppos, count);
382 if (copy_to_user(user_buf, kbuf, count))
383 goto err_kfree;
384
385 *ppos += count;
386
387 ret = count;
388
389err_kfree:
390 kfree(kbuf);
391
392err_iounmap:
393 iounmap(log_base);
394
395 return ret;
396}
397
398static const struct file_operations tboot_log_fops = {
399 .read = tboot_log_read,
400 .llseek = default_llseek,
401};
402
403#endif /* CONFIG_DEBUG_FS */
404
405static __init int tboot_late_init(void)
406{
407 if (!tboot_enabled())
408 return 0;
409
410 tboot_create_trampoline();
411
412 atomic_set(&ap_wfs_count, 0);
413 cpuhp_setup_state(CPUHP_AP_X86_TBOOT_DYING, "x86/tboot:dying", NULL,
414 tboot_dying_cpu);
415#ifdef CONFIG_DEBUG_FS
416 debugfs_create_file("tboot_log", S_IRUSR,
417 arch_debugfs_dir, NULL, &tboot_log_fops);
418#endif
419
420 acpi_os_set_prepare_sleep(&tboot_sleep);
421 acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep);
422 return 0;
423}
424
425late_initcall(tboot_late_init);
426
427/*
428 * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
429 */
430
431#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
432#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
433
434/* # pages for each config regs space - used by fixmap */
435#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
436 TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
437
438/* offsets from pub/priv config space */
439#define TXTCR_HEAP_BASE 0x0300
440#define TXTCR_HEAP_SIZE 0x0308
441
442#define SHA1_SIZE 20
443
444struct sha1_hash {
445 u8 hash[SHA1_SIZE];
446};
447
448struct sinit_mle_data {
449 u32 version; /* currently 6 */
450 struct sha1_hash bios_acm_id;
451 u32 edx_senter_flags;
452 u64 mseg_valid;
453 struct sha1_hash sinit_hash;
454 struct sha1_hash mle_hash;
455 struct sha1_hash stm_hash;
456 struct sha1_hash lcp_policy_hash;
457 u32 lcp_policy_control;
458 u32 rlp_wakeup_addr;
459 u32 reserved;
460 u32 num_mdrs;
461 u32 mdrs_off;
462 u32 num_vtd_dmars;
463 u32 vtd_dmars_off;
464} __packed;
465
466struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl)
467{
468 void *heap_base, *heap_ptr, *config;
469
470 if (!tboot_enabled())
471 return dmar_tbl;
472
473 /*
474 * ACPI tables may not be DMA protected by tboot, so use DMAR copy
475 * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
476 */
477
478 /* map config space in order to get heap addr */
479 config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
480 PAGE_SIZE);
481 if (!config)
482 return NULL;
483
484 /* now map TXT heap */
485 heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE),
486 *(u64 *)(config + TXTCR_HEAP_SIZE));
487 iounmap(config);
488 if (!heap_base)
489 return NULL;
490
491 /* walk heap to SinitMleData */
492 /* skip BiosData */
493 heap_ptr = heap_base + *(u64 *)heap_base;
494 /* skip OsMleData */
495 heap_ptr += *(u64 *)heap_ptr;
496 /* skip OsSinitData */
497 heap_ptr += *(u64 *)heap_ptr;
498 /* now points to SinitMleDataSize; set to SinitMleData */
499 heap_ptr += sizeof(u64);
500 /* get addr of DMAR table */
501 dmar_tbl = (struct acpi_table_header *)(heap_ptr +
502 ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
503 sizeof(u64));
504
505 /* don't unmap heap because dmar.c needs access to this */
506
507 return dmar_tbl;
508}
509
510int tboot_force_iommu(void)
511{
512 if (!tboot_enabled())
513 return 0;
514
515 if (intel_iommu_tboot_noforce)
516 return 1;
517
518 if (no_iommu || swiotlb || dmar_disabled)
519 pr_warning("Forcing Intel-IOMMU to enabled\n");
520
521 dmar_disabled = 0;
522#ifdef CONFIG_SWIOTLB
523 swiotlb = 0;
524#endif
525 no_iommu = 0;
526
527 return 1;
528}
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>
25#include <linux/export.h>
26#include <linux/delay.h>
27#include <linux/sched.h>
28#include <linux/init.h>
29#include <linux/dmar.h>
30#include <linux/cpu.h>
31#include <linux/pfn.h>
32#include <linux/mm.h>
33#include <linux/tboot.h>
34#include <linux/debugfs.h>
35
36#include <asm/realmode.h>
37#include <asm/processor.h>
38#include <asm/bootparam.h>
39#include <asm/pgtable.h>
40#include <asm/pgalloc.h>
41#include <asm/swiotlb.h>
42#include <asm/fixmap.h>
43#include <asm/proto.h>
44#include <asm/setup.h>
45#include <asm/e820/api.h>
46#include <asm/io.h>
47
48#include "../realmode/rm/wakeup.h"
49
50/* Global pointer to shared data; NULL means no measured launch. */
51struct tboot *tboot __read_mostly;
52EXPORT_SYMBOL(tboot);
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
60static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
61
62void __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 */
71 if (!e820__mapped_any(boot_params.tboot_addr,
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");
74 return;
75 }
76
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
101static pgd_t *tboot_pg_dir;
102static 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
112static inline void switch_to_tboot_pt(void)
113{
114 write_cr3(virt_to_phys(tboot_pg_dir));
115}
116
117static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
118 pgprot_t prot)
119{
120 pgd_t *pgd;
121 p4d_t *p4d;
122 pud_t *pud;
123 pmd_t *pmd;
124 pte_t *pte;
125
126 pgd = pgd_offset(&tboot_mm, vaddr);
127 p4d = p4d_alloc(&tboot_mm, pgd, vaddr);
128 if (!p4d)
129 return -1;
130 pud = pud_alloc(&tboot_mm, p4d, 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
142 /*
143 * PTI poisons low addresses in the kernel page tables in the
144 * name of making them unusable for userspace. To execute
145 * code at such a low address, the poison must be cleared.
146 *
147 * Note: 'pgd' actually gets set in p4d_alloc() _or_
148 * pud_alloc() depending on 4/5-level paging.
149 */
150 pgd->pgd &= ~_PAGE_NX;
151
152 return 0;
153}
154
155static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
156 unsigned long nr)
157{
158 /* Reuse the original kernel mapping */
159 tboot_pg_dir = pgd_alloc(&tboot_mm);
160 if (!tboot_pg_dir)
161 return -1;
162
163 for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
164 if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
165 return -1;
166 }
167
168 return 0;
169}
170
171static void tboot_create_trampoline(void)
172{
173 u32 map_base, map_size;
174
175 /* Create identity map for tboot shutdown code. */
176 map_base = PFN_DOWN(tboot->tboot_base);
177 map_size = PFN_UP(tboot->tboot_size);
178 if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
179 panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
180 map_base, map_size);
181}
182
183#ifdef CONFIG_ACPI_SLEEP
184
185static void add_mac_region(phys_addr_t start, unsigned long size)
186{
187 struct tboot_mac_region *mr;
188 phys_addr_t end = start + size;
189
190 if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS)
191 panic("tboot: Too many MAC regions\n");
192
193 if (start && size) {
194 mr = &tboot->mac_regions[tboot->num_mac_regions++];
195 mr->start = round_down(start, PAGE_SIZE);
196 mr->size = round_up(end, PAGE_SIZE) - mr->start;
197 }
198}
199
200static int tboot_setup_sleep(void)
201{
202 int i;
203
204 tboot->num_mac_regions = 0;
205
206 for (i = 0; i < e820_table->nr_entries; i++) {
207 if ((e820_table->entries[i].type != E820_TYPE_RAM)
208 && (e820_table->entries[i].type != E820_TYPE_RESERVED_KERN))
209 continue;
210
211 add_mac_region(e820_table->entries[i].addr, e820_table->entries[i].size);
212 }
213
214 tboot->acpi_sinfo.kernel_s3_resume_vector =
215 real_mode_header->wakeup_start;
216
217 return 0;
218}
219
220#else /* no CONFIG_ACPI_SLEEP */
221
222static int tboot_setup_sleep(void)
223{
224 /* S3 shutdown requested, but S3 not supported by the kernel... */
225 BUG();
226 return -1;
227}
228
229#endif
230
231void tboot_shutdown(u32 shutdown_type)
232{
233 void (*shutdown)(void);
234
235 if (!tboot_enabled())
236 return;
237
238 /*
239 * if we're being called before the 1:1 mapping is set up then just
240 * return and let the normal shutdown happen; this should only be
241 * due to very early panic()
242 */
243 if (!tboot_pg_dir)
244 return;
245
246 /* if this is S3 then set regions to MAC */
247 if (shutdown_type == TB_SHUTDOWN_S3)
248 if (tboot_setup_sleep())
249 return;
250
251 tboot->shutdown_type = shutdown_type;
252
253 switch_to_tboot_pt();
254
255 shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
256 shutdown();
257
258 /* should not reach here */
259 while (1)
260 halt();
261}
262
263static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
264{
265#define TB_COPY_GAS(tbg, g) \
266 tbg.space_id = g.space_id; \
267 tbg.bit_width = g.bit_width; \
268 tbg.bit_offset = g.bit_offset; \
269 tbg.access_width = g.access_width; \
270 tbg.address = g.address;
271
272 TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
273 TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
274 TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
275 TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
276
277 /*
278 * We need phys addr of waking vector, but can't use virt_to_phys() on
279 * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
280 * addr.
281 */
282 tboot->acpi_sinfo.wakeup_vector = fadt->facs +
283 offsetof(struct acpi_table_facs, firmware_waking_vector);
284}
285
286static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
287{
288 static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
289 /* S0,1,2: */ -1, -1, -1,
290 /* S3: */ TB_SHUTDOWN_S3,
291 /* S4: */ TB_SHUTDOWN_S4,
292 /* S5: */ TB_SHUTDOWN_S5 };
293
294 if (!tboot_enabled())
295 return 0;
296
297 tboot_copy_fadt(&acpi_gbl_FADT);
298 tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
299 tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
300 /* we always use the 32b wakeup vector */
301 tboot->acpi_sinfo.vector_width = 32;
302
303 if (sleep_state >= ACPI_S_STATE_COUNT ||
304 acpi_shutdown_map[sleep_state] == -1) {
305 pr_warning("unsupported sleep state 0x%x\n", sleep_state);
306 return -1;
307 }
308
309 tboot_shutdown(acpi_shutdown_map[sleep_state]);
310 return 0;
311}
312
313static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b)
314{
315 if (!tboot_enabled())
316 return 0;
317
318 pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
319 return -ENODEV;
320}
321
322static atomic_t ap_wfs_count;
323
324static int tboot_wait_for_aps(int num_aps)
325{
326 unsigned long timeout;
327
328 timeout = AP_WAIT_TIMEOUT*HZ;
329 while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
330 timeout) {
331 mdelay(1);
332 timeout--;
333 }
334
335 if (timeout)
336 pr_warning("tboot wait for APs timeout\n");
337
338 return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
339}
340
341static int tboot_dying_cpu(unsigned int cpu)
342{
343 atomic_inc(&ap_wfs_count);
344 if (num_online_cpus() == 1) {
345 if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
346 return -EBUSY;
347 }
348 return 0;
349}
350
351#ifdef CONFIG_DEBUG_FS
352
353#define TBOOT_LOG_UUID { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \
354 0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 }
355
356#define TBOOT_SERIAL_LOG_ADDR 0x60000
357#define TBOOT_SERIAL_LOG_SIZE 0x08000
358#define LOG_MAX_SIZE_OFF 16
359#define LOG_BUF_OFF 24
360
361static uint8_t tboot_log_uuid[16] = TBOOT_LOG_UUID;
362
363static ssize_t tboot_log_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos)
364{
365 void __iomem *log_base;
366 u8 log_uuid[16];
367 u32 max_size;
368 void *kbuf;
369 int ret = -EFAULT;
370
371 log_base = ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
372 if (!log_base)
373 return ret;
374
375 memcpy_fromio(log_uuid, log_base, sizeof(log_uuid));
376 if (memcmp(&tboot_log_uuid, log_uuid, sizeof(log_uuid)))
377 goto err_iounmap;
378
379 max_size = readl(log_base + LOG_MAX_SIZE_OFF);
380 if (*ppos >= max_size) {
381 ret = 0;
382 goto err_iounmap;
383 }
384
385 if (*ppos + count > max_size)
386 count = max_size - *ppos;
387
388 kbuf = kmalloc(count, GFP_KERNEL);
389 if (!kbuf) {
390 ret = -ENOMEM;
391 goto err_iounmap;
392 }
393
394 memcpy_fromio(kbuf, log_base + LOG_BUF_OFF + *ppos, count);
395 if (copy_to_user(user_buf, kbuf, count))
396 goto err_kfree;
397
398 *ppos += count;
399
400 ret = count;
401
402err_kfree:
403 kfree(kbuf);
404
405err_iounmap:
406 iounmap(log_base);
407
408 return ret;
409}
410
411static const struct file_operations tboot_log_fops = {
412 .read = tboot_log_read,
413 .llseek = default_llseek,
414};
415
416#endif /* CONFIG_DEBUG_FS */
417
418static __init int tboot_late_init(void)
419{
420 if (!tboot_enabled())
421 return 0;
422
423 tboot_create_trampoline();
424
425 atomic_set(&ap_wfs_count, 0);
426 cpuhp_setup_state(CPUHP_AP_X86_TBOOT_DYING, "x86/tboot:dying", NULL,
427 tboot_dying_cpu);
428#ifdef CONFIG_DEBUG_FS
429 debugfs_create_file("tboot_log", S_IRUSR,
430 arch_debugfs_dir, NULL, &tboot_log_fops);
431#endif
432
433 acpi_os_set_prepare_sleep(&tboot_sleep);
434 acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep);
435 return 0;
436}
437
438late_initcall(tboot_late_init);
439
440/*
441 * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
442 */
443
444#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
445#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
446
447/* # pages for each config regs space - used by fixmap */
448#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
449 TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
450
451/* offsets from pub/priv config space */
452#define TXTCR_HEAP_BASE 0x0300
453#define TXTCR_HEAP_SIZE 0x0308
454
455#define SHA1_SIZE 20
456
457struct sha1_hash {
458 u8 hash[SHA1_SIZE];
459};
460
461struct sinit_mle_data {
462 u32 version; /* currently 6 */
463 struct sha1_hash bios_acm_id;
464 u32 edx_senter_flags;
465 u64 mseg_valid;
466 struct sha1_hash sinit_hash;
467 struct sha1_hash mle_hash;
468 struct sha1_hash stm_hash;
469 struct sha1_hash lcp_policy_hash;
470 u32 lcp_policy_control;
471 u32 rlp_wakeup_addr;
472 u32 reserved;
473 u32 num_mdrs;
474 u32 mdrs_off;
475 u32 num_vtd_dmars;
476 u32 vtd_dmars_off;
477} __packed;
478
479struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl)
480{
481 void *heap_base, *heap_ptr, *config;
482
483 if (!tboot_enabled())
484 return dmar_tbl;
485
486 /*
487 * ACPI tables may not be DMA protected by tboot, so use DMAR copy
488 * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
489 */
490
491 /* map config space in order to get heap addr */
492 config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
493 PAGE_SIZE);
494 if (!config)
495 return NULL;
496
497 /* now map TXT heap */
498 heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE),
499 *(u64 *)(config + TXTCR_HEAP_SIZE));
500 iounmap(config);
501 if (!heap_base)
502 return NULL;
503
504 /* walk heap to SinitMleData */
505 /* skip BiosData */
506 heap_ptr = heap_base + *(u64 *)heap_base;
507 /* skip OsMleData */
508 heap_ptr += *(u64 *)heap_ptr;
509 /* skip OsSinitData */
510 heap_ptr += *(u64 *)heap_ptr;
511 /* now points to SinitMleDataSize; set to SinitMleData */
512 heap_ptr += sizeof(u64);
513 /* get addr of DMAR table */
514 dmar_tbl = (struct acpi_table_header *)(heap_ptr +
515 ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
516 sizeof(u64));
517
518 /* don't unmap heap because dmar.c needs access to this */
519
520 return dmar_tbl;
521}
522
523int tboot_force_iommu(void)
524{
525 if (!tboot_enabled())
526 return 0;
527
528 if (intel_iommu_tboot_noforce)
529 return 1;
530
531 if (no_iommu || swiotlb || dmar_disabled)
532 pr_warning("Forcing Intel-IOMMU to enabled\n");
533
534 dmar_disabled = 0;
535#ifdef CONFIG_SWIOTLB
536 swiotlb = 0;
537#endif
538 no_iommu = 0;
539
540 return 1;
541}