arch/x86/include/asm/amd_iommu_types.h

   1 /*
   2  * Copyright (C) 2007-2009 Advanced Micro Devices, Inc.
   3  * Author: Joerg Roedel <joerg.roedel@amd.com>
   4  *         Leo Duran <leo.duran@amd.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  */
  19
  20 #ifndef _ASM_X86_AMD_IOMMU_TYPES_H
  21 #define _ASM_X86_AMD_IOMMU_TYPES_H
  22
  23 #include <linux/types.h>
  24 #include <linux/mutex.h>
  25 #include <linux/list.h>
  26 #include <linux/spinlock.h>
  27
  28 /*
  29  * Maximum number of IOMMUs supported
  30  */
  31 #define MAX_IOMMUS      32
  32
  33 /*
  34  * some size calculation constants
  35  */
  36 #define DEV_TABLE_ENTRY_SIZE            32
  37 #define ALIAS_TABLE_ENTRY_SIZE          2
  38 #define RLOOKUP_TABLE_ENTRY_SIZE        (sizeof(void *))
  39
  40 /* Length of the MMIO region for the AMD IOMMU */
  41 #define MMIO_REGION_LENGTH       0x4000
  42
  43 /* Capability offsets used by the driver */
  44 #define MMIO_CAP_HDR_OFFSET     0x00
  45 #define MMIO_RANGE_OFFSET       0x0c
  46 #define MMIO_MISC_OFFSET        0x10
  47
  48 /* Masks, shifts and macros to parse the device range capability */
  49 #define MMIO_RANGE_LD_MASK      0xff000000
  50 #define MMIO_RANGE_FD_MASK      0x00ff0000
  51 #define MMIO_RANGE_BUS_MASK     0x0000ff00
  52 #define MMIO_RANGE_LD_SHIFT     24
  53 #define MMIO_RANGE_FD_SHIFT     16
  54 #define MMIO_RANGE_BUS_SHIFT    8
  55 #define MMIO_GET_LD(x)  (((x) & MMIO_RANGE_LD_MASK) >> MMIO_RANGE_LD_SHIFT)
  56 #define MMIO_GET_FD(x)  (((x) & MMIO_RANGE_FD_MASK) >> MMIO_RANGE_FD_SHIFT)
  57 #define MMIO_GET_BUS(x) (((x) & MMIO_RANGE_BUS_MASK) >> MMIO_RANGE_BUS_SHIFT)
  58 #define MMIO_MSI_NUM(x) ((x) & 0x1f)
  59
  60 /* Flag masks for the AMD IOMMU exclusion range */
  61 #define MMIO_EXCL_ENABLE_MASK 0x01ULL
  62 #define MMIO_EXCL_ALLOW_MASK  0x02ULL
  63
  64 /* Used offsets into the MMIO space */
  65 #define MMIO_DEV_TABLE_OFFSET   0x0000
  66 #define MMIO_CMD_BUF_OFFSET     0x0008
  67 #define MMIO_EVT_BUF_OFFSET     0x0010
  68 #define MMIO_CONTROL_OFFSET     0x0018
  69 #define MMIO_EXCL_BASE_OFFSET   0x0020
  70 #define MMIO_EXCL_LIMIT_OFFSET  0x0028
  71 #define MMIO_CMD_HEAD_OFFSET    0x2000
  72 #define MMIO_CMD_TAIL_OFFSET    0x2008
  73 #define MMIO_EVT_HEAD_OFFSET    0x2010
  74 #define MMIO_EVT_TAIL_OFFSET    0x2018
  75 #define MMIO_STATUS_OFFSET      0x2020
  76
  77 /* MMIO status bits */
  78 #define MMIO_STATUS_COM_WAIT_INT_MASK   0x04
  79
  80 /* event logging constants */
  81 #define EVENT_ENTRY_SIZE        0x10
  82 #define EVENT_TYPE_SHIFT        28
  83 #define EVENT_TYPE_MASK         0xf
  84 #define EVENT_TYPE_ILL_DEV      0x1
  85 #define EVENT_TYPE_IO_FAULT     0x2
  86 #define EVENT_TYPE_DEV_TAB_ERR  0x3
  87 #define EVENT_TYPE_PAGE_TAB_ERR 0x4
  88 #define EVENT_TYPE_ILL_CMD      0x5
  89 #define EVENT_TYPE_CMD_HARD_ERR 0x6
  90 #define EVENT_TYPE_IOTLB_INV_TO 0x7
  91 #define EVENT_TYPE_INV_DEV_REQ  0x8
  92 #define EVENT_DEVID_MASK        0xffff
  93 #define EVENT_DEVID_SHIFT       0
  94 #define EVENT_DOMID_MASK        0xffff
  95 #define EVENT_DOMID_SHIFT       0
  96 #define EVENT_FLAGS_MASK        0xfff
  97 #define EVENT_FLAGS_SHIFT       0x10
  98
  99 /* feature control bits */
 100 #define CONTROL_IOMMU_EN        0x00ULL
 101 #define CONTROL_HT_TUN_EN       0x01ULL
 102 #define CONTROL_EVT_LOG_EN      0x02ULL
 103 #define CONTROL_EVT_INT_EN      0x03ULL
 104 #define CONTROL_COMWAIT_EN      0x04ULL
 105 #define CONTROL_PASSPW_EN       0x08ULL
 106 #define CONTROL_RESPASSPW_EN    0x09ULL
 107 #define CONTROL_COHERENT_EN     0x0aULL
 108 #define CONTROL_ISOC_EN         0x0bULL
 109 #define CONTROL_CMDBUF_EN       0x0cULL
 110 #define CONTROL_PPFLOG_EN       0x0dULL
 111 #define CONTROL_PPFINT_EN       0x0eULL
 112
 113 /* command specific defines */
 114 #define CMD_COMPL_WAIT          0x01
 115 #define CMD_INV_DEV_ENTRY       0x02
 116 #define CMD_INV_IOMMU_PAGES     0x03
 117
 118 #define CMD_COMPL_WAIT_STORE_MASK       0x01
 119 #define CMD_COMPL_WAIT_INT_MASK         0x02
 120 #define CMD_INV_IOMMU_PAGES_SIZE_MASK   0x01
 121 #define CMD_INV_IOMMU_PAGES_PDE_MASK    0x02
 122
 123 #define CMD_INV_IOMMU_ALL_PAGES_ADDRESS 0x7fffffffffffffffULL
 124
 125 /* macros and definitions for device table entries */
 126 #define DEV_ENTRY_VALID         0x00
 127 #define DEV_ENTRY_TRANSLATION   0x01
 128 #define DEV_ENTRY_IR            0x3d
 129 #define DEV_ENTRY_IW            0x3e
 130 #define DEV_ENTRY_NO_PAGE_FAULT 0x62
 131 #define DEV_ENTRY_EX            0x67
 132 #define DEV_ENTRY_SYSMGT1       0x68
 133 #define DEV_ENTRY_SYSMGT2       0x69
 134 #define DEV_ENTRY_INIT_PASS     0xb8
 135 #define DEV_ENTRY_EINT_PASS     0xb9
 136 #define DEV_ENTRY_NMI_PASS      0xba
 137 #define DEV_ENTRY_LINT0_PASS    0xbe
 138 #define DEV_ENTRY_LINT1_PASS    0xbf
 139 #define DEV_ENTRY_MODE_MASK     0x07
 140 #define DEV_ENTRY_MODE_SHIFT    0x09
 141
 142 /* constants to configure the command buffer */
 143 #define CMD_BUFFER_SIZE    8192
 144 #define CMD_BUFFER_UNINITIALIZED 1
 145 #define CMD_BUFFER_ENTRIES 512
 146 #define MMIO_CMD_SIZE_SHIFT 56
 147 #define MMIO_CMD_SIZE_512 (0x9ULL << MMIO_CMD_SIZE_SHIFT)
 148
 149 /* constants for event buffer handling */
 150 #define EVT_BUFFER_SIZE         8192 /* 512 entries */
 151 #define EVT_LEN_MASK            (0x9ULL << 56)
 152
 153 #define PAGE_MODE_NONE    0x00
 154 #define PAGE_MODE_1_LEVEL 0x01
 155 #define PAGE_MODE_2_LEVEL 0x02
 156 #define PAGE_MODE_3_LEVEL 0x03
 157 #define PAGE_MODE_4_LEVEL 0x04
 158 #define PAGE_MODE_5_LEVEL 0x05
 159 #define PAGE_MODE_6_LEVEL 0x06
 160
 161 #define PM_LEVEL_SHIFT(x)       (12 + ((x) * 9))
 162 #define PM_LEVEL_SIZE(x)        (((x) < 6) ? \
 163                                   ((1ULL << PM_LEVEL_SHIFT((x))) - 1): \
 164                                    (0xffffffffffffffffULL))
 165 #define PM_LEVEL_INDEX(x, a)    (((a) >> PM_LEVEL_SHIFT((x))) & 0x1ffULL)
 166 #define PM_LEVEL_ENC(x)         (((x) << 9) & 0xe00ULL)
 167 #define PM_LEVEL_PDE(x, a)      ((a) | PM_LEVEL_ENC((x)) | \
 168                                  IOMMU_PTE_P | IOMMU_PTE_IR | IOMMU_PTE_IW)
 169 #define PM_PTE_LEVEL(pte)       (((pte) >> 9) & 0x7ULL)
 170
 171 #define PM_MAP_4k               0
 172 #define PM_ADDR_MASK            0x000ffffffffff000ULL
 173 #define PM_MAP_MASK(lvl)        (PM_ADDR_MASK & \
 174                                 (~((1ULL << (12 + ((lvl) * 9))) - 1)))
 175 #define PM_ALIGNED(lvl, addr)   ((PM_MAP_MASK(lvl) & (addr)) == (addr))
 176
 177 #define IOMMU_PTE_P  (1ULL << 0)
 178 #define IOMMU_PTE_TV (1ULL << 1)
 179 #define IOMMU_PTE_U  (1ULL << 59)
 180 #define IOMMU_PTE_FC (1ULL << 60)
 181 #define IOMMU_PTE_IR (1ULL << 61)
 182 #define IOMMU_PTE_IW (1ULL << 62)
 183
 184 #define IOMMU_PAGE_MASK (((1ULL << 52) - 1) & ~0xfffULL)
 185 #define IOMMU_PTE_PRESENT(pte) ((pte) & IOMMU_PTE_P)
 186 #define IOMMU_PTE_PAGE(pte) (phys_to_virt((pte) & IOMMU_PAGE_MASK))
 187 #define IOMMU_PTE_MODE(pte) (((pte) >> 9) & 0x07)
 188
 189 #define IOMMU_PROT_MASK 0x03
 190 #define IOMMU_PROT_IR 0x01
 191 #define IOMMU_PROT_IW 0x02
 192
 193 /* IOMMU capabilities */
 194 #define IOMMU_CAP_IOTLB   24
 195 #define IOMMU_CAP_NPCACHE 26
 196
 197 #define MAX_DOMAIN_ID 65536
 198
 199 /* FIXME: move this macro to <linux/pci.h> */
 200 #define PCI_BUS(x) (((x) >> 8) & 0xff)
 201
 202 /* Protection domain flags */
 203 #define PD_DMA_OPS_MASK         (1UL << 0) /* domain used for dma_ops */
 204 #define PD_DEFAULT_MASK         (1UL << 1) /* domain is a default dma_ops
 205                                               domain for an IOMMU */
 206 #define PD_PASSTHROUGH_MASK     (1UL << 2) /* domain has no page
 207                                               translation */
 208
 209 extern bool amd_iommu_dump;
 210 #define DUMP_printk(format, arg...)                                     \
 211         do {                                                            \
 212                 if (amd_iommu_dump)                                             \
 213                         printk(KERN_INFO "AMD-Vi: " format, ## arg);    \
 214         } while(0);
 215
 216 /* global flag if IOMMUs cache non-present entries */
 217 extern bool amd_iommu_np_cache;
 218
 219 /*
 220  * Make iterating over all IOMMUs easier
 221  */
 222 #define for_each_iommu(iommu) \
 223         list_for_each_entry((iommu), &amd_iommu_list, list)
 224 #define for_each_iommu_safe(iommu, next) \
 225         list_for_each_entry_safe((iommu), (next), &amd_iommu_list, list)
 226
 227 #define APERTURE_RANGE_SHIFT    27      /* 128 MB */
 228 #define APERTURE_RANGE_SIZE     (1ULL << APERTURE_RANGE_SHIFT)
 229 #define APERTURE_RANGE_PAGES    (APERTURE_RANGE_SIZE >> PAGE_SHIFT)
 230 #define APERTURE_MAX_RANGES     32      /* allows 4GB of DMA address space */
 231 #define APERTURE_RANGE_INDEX(a) ((a) >> APERTURE_RANGE_SHIFT)
 232 #define APERTURE_PAGE_INDEX(a)  (((a) >> 21) & 0x3fULL)
 233
 234 /*
 235  * This structure contains generic data for  IOMMU protection domains
 236  * independent of their use.
 237  */
 238 struct protection_domain {
 239         struct list_head list;  /* for list of all protection domains */
 240         struct list_head dev_list; /* List of all devices in this domain */
 241         spinlock_t lock;        /* mostly used to lock the page table*/
 242         struct mutex api_lock;  /* protect page tables in the iommu-api path */
 243         u16 id;                 /* the domain id written to the device table */
 244         int mode;               /* paging mode (0-6 levels) */
 245         u64 *pt_root;           /* page table root pointer */
 246         unsigned long flags;    /* flags to find out type of domain */
 247         bool updated;           /* complete domain flush required */
 248         unsigned dev_cnt;       /* devices assigned to this domain */
 249         unsigned dev_iommu[MAX_IOMMUS]; /* per-IOMMU reference count */
 250         void *priv;             /* private data */
 251
 252 };
 253
 254 /*
 255  * This struct contains device specific data for the IOMMU
 256  */
 257 struct iommu_dev_data {
 258         struct list_head list;            /* For domain->dev_list */
 259         struct device *dev;               /* Device this data belong to */
 260         struct device *alias;             /* The Alias Device */
 261         struct protection_domain *domain; /* Domain the device is bound to */
 262         atomic_t bind;                    /* Domain attach reverent count */
 263 };
 264
 265 /*
 266  * For dynamic growth the aperture size is split into ranges of 128MB of
 267  * DMA address space each. This struct represents one such range.
 268  */
 269 struct aperture_range {
 270
 271         /* address allocation bitmap */
 272         unsigned long *bitmap;
 273
 274         /*
 275          * Array of PTE pages for the aperture. In this array we save all the
 276          * leaf pages of the domain page table used for the aperture. This way
 277          * we don't need to walk the page table to find a specific PTE. We can
 278          * just calculate its address in constant time.
 279          */
 280         u64 *pte_pages[64];
 281
 282         unsigned long offset;
 283 };
 284
 285 /*
 286  * Data container for a dma_ops specific protection domain
 287  */
 288 struct dma_ops_domain {
 289         struct list_head list;
 290
 291         /* generic protection domain information */
 292         struct protection_domain domain;
 293
 294         /* size of the aperture for the mappings */
 295         unsigned long aperture_size;
 296
 297         /* address we start to search for free addresses */
 298         unsigned long next_address;
 299
 300         /* address space relevant data */
 301         struct aperture_range *aperture[APERTURE_MAX_RANGES];
 302
 303         /* This will be set to true when TLB needs to be flushed */
 304         bool need_flush;
 305
 306         /*
 307          * if this is a preallocated domain, keep the device for which it was
 308          * preallocated in this variable
 309          */
 310         u16 target_dev;
 311 };
 312
 313 /*
 314  * Structure where we save information about one hardware AMD IOMMU in the
 315  * system.
 316  */
 317 struct amd_iommu {
 318         struct list_head list;
 319
 320         /* Index within the IOMMU array */
 321         int index;
 322
 323         /* locks the accesses to the hardware */
 324         spinlock_t lock;
 325
 326         /* Pointer to PCI device of this IOMMU */
 327         struct pci_dev *dev;
 328
 329         /* physical address of MMIO space */
 330         u64 mmio_phys;
 331         /* virtual address of MMIO space */
 332         u8 *mmio_base;
 333
 334         /* capabilities of that IOMMU read from ACPI */
 335         u32 cap;
 336
 337         /*
 338          * Capability pointer. There could be more than one IOMMU per PCI
 339          * device function if there are more than one AMD IOMMU capability
 340          * pointers.
 341          */
 342         u16 cap_ptr;
 343
 344         /* pci domain of this IOMMU */
 345         u16 pci_seg;
 346
 347         /* first device this IOMMU handles. read from PCI */
 348         u16 first_device;
 349         /* last device this IOMMU handles. read from PCI */
 350         u16 last_device;
 351
 352         /* start of exclusion range of that IOMMU */
 353         u64 exclusion_start;
 354         /* length of exclusion range of that IOMMU */
 355         u64 exclusion_length;
 356
 357         /* command buffer virtual address */
 358         u8 *cmd_buf;
 359         /* size of command buffer */
 360         u32 cmd_buf_size;
 361
 362         /* size of event buffer */
 363         u32 evt_buf_size;
 364         /* event buffer virtual address */
 365         u8 *evt_buf;
 366         /* MSI number for event interrupt */
 367         u16 evt_msi_num;
 368
 369         /* true if interrupts for this IOMMU are already enabled */
 370         bool int_enabled;
 371
 372         /* if one, we need to send a completion wait command */
 373         bool need_sync;
 374
 375         /* becomes true if a command buffer reset is running */
 376         bool reset_in_progress;
 377
 378         /* default dma_ops domain for that IOMMU */
 379         struct dma_ops_domain *default_dom;
 380 };
 381
 382 /*
 383  * List with all IOMMUs in the system. This list is not locked because it is
 384  * only written and read at driver initialization or suspend time
 385  */
 386 extern struct list_head amd_iommu_list;
 387
 388 /*
 389  * Array with pointers to each IOMMU struct
 390  * The indices are referenced in the protection domains
 391  */
 392 extern struct amd_iommu *amd_iommus[MAX_IOMMUS];
 393
 394 /* Number of IOMMUs present in the system */
 395 extern int amd_iommus_present;
 396
 397 /*
 398  * Declarations for the global list of all protection domains
 399  */
 400 extern spinlock_t amd_iommu_pd_lock;
 401 extern struct list_head amd_iommu_pd_list;
 402
 403 /*
 404  * Structure defining one entry in the device table
 405  */
 406 struct dev_table_entry {
 407         u32 data[8];
 408 };
 409
 410 /*
 411  * One entry for unity mappings parsed out of the ACPI table.
 412  */
 413 struct unity_map_entry {
 414         struct list_head list;
 415
 416         /* starting device id this entry is used for (including) */
 417         u16 devid_start;
 418         /* end device id this entry is used for (including) */
 419         u16 devid_end;
 420
 421         /* start address to unity map (including) */
 422         u64 address_start;
 423         /* end address to unity map (including) */
 424         u64 address_end;
 425
 426         /* required protection */
 427         int prot;
 428 };
 429
 430 /*
 431  * List of all unity mappings. It is not locked because as runtime it is only
 432  * read. It is created at ACPI table parsing time.
 433  */
 434 extern struct list_head amd_iommu_unity_map;
 435
 436 /*
 437  * Data structures for device handling
 438  */
 439
 440 /*
 441  * Device table used by hardware. Read and write accesses by software are
 442  * locked with the amd_iommu_pd_table lock.
 443  */
 444 extern struct dev_table_entry *amd_iommu_dev_table;
 445
 446 /*
 447  * Alias table to find requestor ids to device ids. Not locked because only
 448  * read on runtime.
 449  */
 450 extern u16 *amd_iommu_alias_table;
 451
 452 /*
 453  * Reverse lookup table to find the IOMMU which translates a specific device.
 454  */
 455 extern struct amd_iommu **amd_iommu_rlookup_table;
 456
 457 /* size of the dma_ops aperture as power of 2 */
 458 extern unsigned amd_iommu_aperture_order;
 459
 460 /* largest PCI device id we expect translation requests for */
 461 extern u16 amd_iommu_last_bdf;
 462
 463 /* allocation bitmap for domain ids */
 464 extern unsigned long *amd_iommu_pd_alloc_bitmap;
 465
 466 /*
 467  * If true, the addresses will be flushed on unmap time, not when
 468  * they are reused
 469  */
 470 extern bool amd_iommu_unmap_flush;
 471
 472 /* takes bus and device/function and returns the device id
 473  * FIXME: should that be in generic PCI code? */
 474 static inline u16 calc_devid(u8 bus, u8 devfn)
 475 {
 476         return (((u16)bus) << 8) | devfn;
 477 }
 478
 479 #ifdef CONFIG_AMD_IOMMU_STATS
 480
 481 struct __iommu_counter {
 482         char *name;
 483         struct dentry *dent;
 484         u64 value;
 485 };
 486
 487 #define DECLARE_STATS_COUNTER(nm) \
 488         static struct __iommu_counter nm = {    \
 489                 .name = #nm,                    \
 490         }
 491
 492 #define INC_STATS_COUNTER(name)         name.value += 1
 493 #define ADD_STATS_COUNTER(name, x)      name.value += (x)
 494 #define SUB_STATS_COUNTER(name, x)      name.value -= (x)
 495
 496 #else /* CONFIG_AMD_IOMMU_STATS */
 497
 498 #define DECLARE_STATS_COUNTER(name)
 499 #define INC_STATS_COUNTER(name)
 500 #define ADD_STATS_COUNTER(name, x)
 501 #define SUB_STATS_COUNTER(name, x)
 502
 503 #endif /* CONFIG_AMD_IOMMU_STATS */
 504
 505 #endif /* _ASM_X86_AMD_IOMMU_TYPES_H */