net: remove mm.h inclusion from netdevice.h
[linux-3.10.git] / arch / x86 / kernel / tboot.c
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/delay.h>
26 #include <linux/sched.h>
27 #include <linux/init.h>
28 #include <linux/dmar.h>
29 #include <linux/cpu.h>
30 #include <linux/pfn.h>
31 #include <linux/mm.h>
32 #include <linux/tboot.h>
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>
39 #include <asm/swiotlb.h>
40 #include <asm/fixmap.h>
41 #include <asm/proto.h>
42 #include <asm/setup.h>
43 #include <asm/e820.h>
44 #include <asm/io.h>
45
46 #include "acpi/realmode/wakeup.h"
47
48 /* Global pointer to shared data; NULL means no measured launch. */
49 struct tboot *tboot __read_mostly;
50 EXPORT_SYMBOL(tboot);
51
52 /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
53 #define AP_WAIT_TIMEOUT         1
54
55 #undef pr_fmt
56 #define pr_fmt(fmt)     "tboot: " fmt
57
58 static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
59
60 void __init tboot_probe(void)
61 {
62         /* Look for valid page-aligned address for shared page. */
63         if (!boot_params.tboot_addr)
64                 return;
65         /*
66          * also verify that it is mapped as we expect it before calling
67          * set_fixmap(), to reduce chance of garbage value causing crash
68          */
69         if (!e820_any_mapped(boot_params.tboot_addr,
70                              boot_params.tboot_addr, E820_RESERVED)) {
71                 pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
72                 return;
73         }
74
75         /* only a natively booted kernel should be using TXT */
76         if (paravirt_enabled()) {
77                 pr_warning("non-0 tboot_addr but pv_ops is enabled\n");
78                 return;
79         }
80
81         /* Map and check for tboot UUID. */
82         set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
83         tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
84         if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
85                 pr_warning("tboot at 0x%llx is invalid\n",
86                            boot_params.tboot_addr);
87                 tboot = NULL;
88                 return;
89         }
90         if (tboot->version < 5) {
91                 pr_warning("tboot version is invalid: %u\n", tboot->version);
92                 tboot = NULL;
93                 return;
94         }
95
96         pr_info("found shared page at phys addr 0x%llx:\n",
97                 boot_params.tboot_addr);
98         pr_debug("version: %d\n", tboot->version);
99         pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
100         pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
101         pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
102         pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
103 }
104
105 static pgd_t *tboot_pg_dir;
106 static struct mm_struct tboot_mm = {
107         .mm_rb          = RB_ROOT,
108         .pgd            = swapper_pg_dir,
109         .mm_users       = ATOMIC_INIT(2),
110         .mm_count       = ATOMIC_INIT(1),
111         .mmap_sem       = __RWSEM_INITIALIZER(init_mm.mmap_sem),
112         .page_table_lock =  __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
113         .mmlist         = LIST_HEAD_INIT(init_mm.mmlist),
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, NULL, 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
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);
170 }
171
172 #ifdef CONFIG_ACPI_SLEEP
173
174 static void add_mac_region(phys_addr_t start, unsigned long size)
175 {
176         struct tboot_mac_region *mr;
177         phys_addr_t end = start + size;
178
179         if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS)
180                 panic("tboot: Too many MAC regions\n");
181
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 {
191         int i;
192
193         tboot->num_mac_regions = 0;
194
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;
199
200                 add_mac_region(e820.map[i].addr, e820.map[i].size);
201         }
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;
215 }
216
217 #endif
218
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)
236                 if (tboot_setup_sleep())
237                         return;
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;
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
300 static atomic_t ap_wfs_count;
301
302 static int tboot_wait_for_aps(int num_aps)
303 {
304         unsigned long timeout;
305
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 {
340         if (!tboot_enabled())
341                 return 0;
342
343         tboot_create_trampoline();
344
345         atomic_set(&ap_wfs_count, 0);
346         register_hotcpu_notifier(&tboot_cpu_notifier);
347         return 0;
348 }
349
350 late_initcall(tboot_late_init);
351
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 }