include/linux/edac.h

   1 /*
   2  * Generic EDAC defs
   3  *
   4  * Author: Dave Jiang <djiang@mvista.com>
   5  *
   6  * 2006-2008 (c) MontaVista Software, Inc. This file is licensed under
   7  * the terms of the GNU General Public License version 2. This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  *
  11  */
  12 #ifndef _LINUX_EDAC_H_
  13 #define _LINUX_EDAC_H_
  14
  15 #include <linux/atomic.h>
  16 #include <linux/device.h>
  17 #include <linux/completion.h>
  18 #include <linux/workqueue.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/numa.h>
  21
  22 #define EDAC_DEVICE_NAME_LEN    31
  23
  24 struct device;
  25
  26 #define EDAC_OPSTATE_INVAL      -1
  27 #define EDAC_OPSTATE_POLL       0
  28 #define EDAC_OPSTATE_NMI        1
  29 #define EDAC_OPSTATE_INT        2
  30
  31 extern int edac_op_state;
  32
  33 struct bus_type *edac_get_sysfs_subsys(void);
  34
  35 static inline void opstate_init(void)
  36 {
  37         switch (edac_op_state) {
  38         case EDAC_OPSTATE_POLL:
  39         case EDAC_OPSTATE_NMI:
  40                 break;
  41         default:
  42                 edac_op_state = EDAC_OPSTATE_POLL;
  43         }
  44         return;
  45 }
  46
  47 /* Max length of a DIMM label*/
  48 #define EDAC_MC_LABEL_LEN       31
  49
  50 /* Maximum size of the location string */
  51 #define LOCATION_SIZE 256
  52
  53 /* Defines the maximum number of labels that can be reported */
  54 #define EDAC_MAX_LABELS         8
  55
  56 /* String used to join two or more labels */
  57 #define OTHER_LABEL " or "
  58
  59 /**
  60  * enum dev_type - describe the type of memory DRAM chips used at the stick
  61  * @DEV_UNKNOWN:        Can't be determined, or MC doesn't support detect it
  62  * @DEV_X1:             1 bit for data
  63  * @DEV_X2:             2 bits for data
  64  * @DEV_X4:             4 bits for data
  65  * @DEV_X8:             8 bits for data
  66  * @DEV_X16:            16 bits for data
  67  * @DEV_X32:            32 bits for data
  68  * @DEV_X64:            64 bits for data
  69  *
  70  * Typical values are x4 and x8.
  71  */
  72 enum dev_type {
  73         DEV_UNKNOWN = 0,
  74         DEV_X1,
  75         DEV_X2,
  76         DEV_X4,
  77         DEV_X8,
  78         DEV_X16,
  79         DEV_X32,                /* Do these parts exist? */
  80         DEV_X64                 /* Do these parts exist? */
  81 };
  82
  83 #define DEV_FLAG_UNKNOWN        BIT(DEV_UNKNOWN)
  84 #define DEV_FLAG_X1             BIT(DEV_X1)
  85 #define DEV_FLAG_X2             BIT(DEV_X2)
  86 #define DEV_FLAG_X4             BIT(DEV_X4)
  87 #define DEV_FLAG_X8             BIT(DEV_X8)
  88 #define DEV_FLAG_X16            BIT(DEV_X16)
  89 #define DEV_FLAG_X32            BIT(DEV_X32)
  90 #define DEV_FLAG_X64            BIT(DEV_X64)
  91
  92 /**
  93  * enum hw_event_mc_err_type - type of the detected error
  94  *
  95  * @HW_EVENT_ERR_CORRECTED:     Corrected Error - Indicates that an ECC
  96  *                              corrected error was detected
  97  * @HW_EVENT_ERR_UNCORRECTED:   Uncorrected Error - Indicates an error that
  98  *                              can't be corrected by ECC, but it is not
  99  *                              fatal (maybe it is on an unused memory area,
 100  *                              or the memory controller could recover from
 101  *                              it for example, by re-trying the operation).
 102  * @HW_EVENT_ERR_DEFERRED:      Deferred Error - Indicates an uncorrectable
 103  *                              error whose handling is not urgent. This could
 104  *                              be due to hardware data poisoning where the
 105  *                              system can continue operation until the poisoned
 106  *                              data is consumed. Preemptive measures may also
 107  *                              be taken, e.g. offlining pages, etc.
 108  * @HW_EVENT_ERR_FATAL:         Fatal Error - Uncorrected error that could not
 109  *                              be recovered.
 110  * @HW_EVENT_ERR_INFO:          Informational - The CPER spec defines a forth
 111  *                              type of error: informational logs.
 112  */
 113 enum hw_event_mc_err_type {
 114         HW_EVENT_ERR_CORRECTED,
 115         HW_EVENT_ERR_UNCORRECTED,
 116         HW_EVENT_ERR_DEFERRED,
 117         HW_EVENT_ERR_FATAL,
 118         HW_EVENT_ERR_INFO,
 119 };
 120
 121 static inline char *mc_event_error_type(const unsigned int err_type)
 122 {
 123         switch (err_type) {
 124         case HW_EVENT_ERR_CORRECTED:
 125                 return "Corrected";
 126         case HW_EVENT_ERR_UNCORRECTED:
 127                 return "Uncorrected";
 128         case HW_EVENT_ERR_DEFERRED:
 129                 return "Deferred";
 130         case HW_EVENT_ERR_FATAL:
 131                 return "Fatal";
 132         default:
 133         case HW_EVENT_ERR_INFO:
 134                 return "Info";
 135         }
 136 }
 137
 138 /**
 139  * enum mem_type - memory types. For a more detailed reference, please see
 140  *                      http://en.wikipedia.org/wiki/DRAM
 141  *
 142  * @MEM_EMPTY:          Empty csrow
 143  * @MEM_RESERVED:       Reserved csrow type
 144  * @MEM_UNKNOWN:        Unknown csrow type
 145  * @MEM_FPM:            FPM - Fast Page Mode, used on systems up to 1995.
 146  * @MEM_EDO:            EDO - Extended data out, used on systems up to 1998.
 147  * @MEM_BEDO:           BEDO - Burst Extended data out, an EDO variant.
 148  * @MEM_SDR:            SDR - Single data rate SDRAM
 149  *                      http://en.wikipedia.org/wiki/Synchronous_dynamic_random-access_memory
 150  *                      They use 3 pins for chip select: Pins 0 and 2 are
 151  *                      for rank 0; pins 1 and 3 are for rank 1, if the memory
 152  *                      is dual-rank.
 153  * @MEM_RDR:            Registered SDR SDRAM
 154  * @MEM_DDR:            Double data rate SDRAM
 155  *                      http://en.wikipedia.org/wiki/DDR_SDRAM
 156  * @MEM_RDDR:           Registered Double data rate SDRAM
 157  *                      This is a variant of the DDR memories.
 158  *                      A registered memory has a buffer inside it, hiding
 159  *                      part of the memory details to the memory controller.
 160  * @MEM_RMBS:           Rambus DRAM, used on a few Pentium III/IV controllers.
 161  * @MEM_DDR2:           DDR2 RAM, as described at JEDEC JESD79-2F.
 162  *                      Those memories are labeled as "PC2-" instead of "PC" to
 163  *                      differentiate from DDR.
 164  * @MEM_FB_DDR2:        Fully-Buffered DDR2, as described at JEDEC Std No. 205
 165  *                      and JESD206.
 166  *                      Those memories are accessed per DIMM slot, and not by
 167  *                      a chip select signal.
 168  * @MEM_RDDR2:          Registered DDR2 RAM
 169  *                      This is a variant of the DDR2 memories.
 170  * @MEM_XDR:            Rambus XDR
 171  *                      It is an evolution of the original RAMBUS memories,
 172  *                      created to compete with DDR2. Weren't used on any
 173  *                      x86 arch, but cell_edac PPC memory controller uses it.
 174  * @MEM_DDR3:           DDR3 RAM
 175  * @MEM_RDDR3:          Registered DDR3 RAM
 176  *                      This is a variant of the DDR3 memories.
 177  * @MEM_LRDDR3:         Load-Reduced DDR3 memory.
 178  * @MEM_LPDDR3:         Low-Power DDR3 memory.
 179  * @MEM_DDR4:           Unbuffered DDR4 RAM
 180  * @MEM_RDDR4:          Registered DDR4 RAM
 181  *                      This is a variant of the DDR4 memories.
 182  * @MEM_LRDDR4:         Load-Reduced DDR4 memory.
 183  * @MEM_LPDDR4:         Low-Power DDR4 memory.
 184  * @MEM_DDR5:           Unbuffered DDR5 RAM
 185  * @MEM_NVDIMM:         Non-volatile RAM
 186  * @MEM_WIO2:           Wide I/O 2.
 187  */
 188 enum mem_type {
 189         MEM_EMPTY = 0,
 190         MEM_RESERVED,
 191         MEM_UNKNOWN,
 192         MEM_FPM,
 193         MEM_EDO,
 194         MEM_BEDO,
 195         MEM_SDR,
 196         MEM_RDR,
 197         MEM_DDR,
 198         MEM_RDDR,
 199         MEM_RMBS,
 200         MEM_DDR2,
 201         MEM_FB_DDR2,
 202         MEM_RDDR2,
 203         MEM_XDR,
 204         MEM_DDR3,
 205         MEM_RDDR3,
 206         MEM_LRDDR3,
 207         MEM_LPDDR3,
 208         MEM_DDR4,
 209         MEM_RDDR4,
 210         MEM_LRDDR4,
 211         MEM_LPDDR4,
 212         MEM_DDR5,
 213         MEM_NVDIMM,
 214         MEM_WIO2,
 215 };
 216
 217 #define MEM_FLAG_EMPTY          BIT(MEM_EMPTY)
 218 #define MEM_FLAG_RESERVED       BIT(MEM_RESERVED)
 219 #define MEM_FLAG_UNKNOWN        BIT(MEM_UNKNOWN)
 220 #define MEM_FLAG_FPM            BIT(MEM_FPM)
 221 #define MEM_FLAG_EDO            BIT(MEM_EDO)
 222 #define MEM_FLAG_BEDO           BIT(MEM_BEDO)
 223 #define MEM_FLAG_SDR            BIT(MEM_SDR)
 224 #define MEM_FLAG_RDR            BIT(MEM_RDR)
 225 #define MEM_FLAG_DDR            BIT(MEM_DDR)
 226 #define MEM_FLAG_RDDR           BIT(MEM_RDDR)
 227 #define MEM_FLAG_RMBS           BIT(MEM_RMBS)
 228 #define MEM_FLAG_DDR2           BIT(MEM_DDR2)
 229 #define MEM_FLAG_FB_DDR2        BIT(MEM_FB_DDR2)
 230 #define MEM_FLAG_RDDR2          BIT(MEM_RDDR2)
 231 #define MEM_FLAG_XDR            BIT(MEM_XDR)
 232 #define MEM_FLAG_DDR3           BIT(MEM_DDR3)
 233 #define MEM_FLAG_RDDR3          BIT(MEM_RDDR3)
 234 #define MEM_FLAG_LPDDR3         BIT(MEM_LPDDR3)
 235 #define MEM_FLAG_DDR4           BIT(MEM_DDR4)
 236 #define MEM_FLAG_RDDR4          BIT(MEM_RDDR4)
 237 #define MEM_FLAG_LRDDR4         BIT(MEM_LRDDR4)
 238 #define MEM_FLAG_LPDDR4         BIT(MEM_LPDDR4)
 239 #define MEM_FLAG_DDR5           BIT(MEM_DDR5)
 240 #define MEM_FLAG_NVDIMM         BIT(MEM_NVDIMM)
 241 #define MEM_FLAG_WIO2           BIT(MEM_WIO2)
 242
 243 /**
 244  * enum edac_type - Error Detection and Correction capabilities and mode
 245  * @EDAC_UNKNOWN:       Unknown if ECC is available
 246  * @EDAC_NONE:          Doesn't support ECC
 247  * @EDAC_RESERVED:      Reserved ECC type
 248  * @EDAC_PARITY:        Detects parity errors
 249  * @EDAC_EC:            Error Checking - no correction
 250  * @EDAC_SECDED:        Single bit error correction, Double detection
 251  * @EDAC_S2ECD2ED:      Chipkill x2 devices - do these exist?
 252  * @EDAC_S4ECD4ED:      Chipkill x4 devices
 253  * @EDAC_S8ECD8ED:      Chipkill x8 devices
 254  * @EDAC_S16ECD16ED:    Chipkill x16 devices
 255  */
 256 enum edac_type {
 257         EDAC_UNKNOWN =  0,
 258         EDAC_NONE,
 259         EDAC_RESERVED,
 260         EDAC_PARITY,
 261         EDAC_EC,
 262         EDAC_SECDED,
 263         EDAC_S2ECD2ED,
 264         EDAC_S4ECD4ED,
 265         EDAC_S8ECD8ED,
 266         EDAC_S16ECD16ED,
 267 };
 268
 269 #define EDAC_FLAG_UNKNOWN       BIT(EDAC_UNKNOWN)
 270 #define EDAC_FLAG_NONE          BIT(EDAC_NONE)
 271 #define EDAC_FLAG_PARITY        BIT(EDAC_PARITY)
 272 #define EDAC_FLAG_EC            BIT(EDAC_EC)
 273 #define EDAC_FLAG_SECDED        BIT(EDAC_SECDED)
 274 #define EDAC_FLAG_S2ECD2ED      BIT(EDAC_S2ECD2ED)
 275 #define EDAC_FLAG_S4ECD4ED      BIT(EDAC_S4ECD4ED)
 276 #define EDAC_FLAG_S8ECD8ED      BIT(EDAC_S8ECD8ED)
 277 #define EDAC_FLAG_S16ECD16ED    BIT(EDAC_S16ECD16ED)
 278
 279 /**
 280  * enum scrub_type - scrubbing capabilities
 281  * @SCRUB_UNKNOWN:              Unknown if scrubber is available
 282  * @SCRUB_NONE:                 No scrubber
 283  * @SCRUB_SW_PROG:              SW progressive (sequential) scrubbing
 284  * @SCRUB_SW_SRC:               Software scrub only errors
 285  * @SCRUB_SW_PROG_SRC:          Progressive software scrub from an error
 286  * @SCRUB_SW_TUNABLE:           Software scrub frequency is tunable
 287  * @SCRUB_HW_PROG:              HW progressive (sequential) scrubbing
 288  * @SCRUB_HW_SRC:               Hardware scrub only errors
 289  * @SCRUB_HW_PROG_SRC:          Progressive hardware scrub from an error
 290  * @SCRUB_HW_TUNABLE:           Hardware scrub frequency is tunable
 291  */
 292 enum scrub_type {
 293         SCRUB_UNKNOWN = 0,
 294         SCRUB_NONE,
 295         SCRUB_SW_PROG,
 296         SCRUB_SW_SRC,
 297         SCRUB_SW_PROG_SRC,
 298         SCRUB_SW_TUNABLE,
 299         SCRUB_HW_PROG,
 300         SCRUB_HW_SRC,
 301         SCRUB_HW_PROG_SRC,
 302         SCRUB_HW_TUNABLE
 303 };
 304
 305 #define SCRUB_FLAG_SW_PROG      BIT(SCRUB_SW_PROG)
 306 #define SCRUB_FLAG_SW_SRC       BIT(SCRUB_SW_SRC)
 307 #define SCRUB_FLAG_SW_PROG_SRC  BIT(SCRUB_SW_PROG_SRC)
 308 #define SCRUB_FLAG_SW_TUN       BIT(SCRUB_SW_SCRUB_TUNABLE)
 309 #define SCRUB_FLAG_HW_PROG      BIT(SCRUB_HW_PROG)
 310 #define SCRUB_FLAG_HW_SRC       BIT(SCRUB_HW_SRC)
 311 #define SCRUB_FLAG_HW_PROG_SRC  BIT(SCRUB_HW_PROG_SRC)
 312 #define SCRUB_FLAG_HW_TUN       BIT(SCRUB_HW_TUNABLE)
 313
 314 /* FIXME - should have notify capabilities: NMI, LOG, PROC, etc */
 315
 316 /* EDAC internal operation states */
 317 #define OP_ALLOC                0x100
 318 #define OP_RUNNING_POLL         0x201
 319 #define OP_RUNNING_INTERRUPT    0x202
 320 #define OP_RUNNING_POLL_INTR    0x203
 321 #define OP_OFFLINE              0x300
 322
 323 /**
 324  * enum edac_mc_layer_type - memory controller hierarchy layer
 325  *
 326  * @EDAC_MC_LAYER_BRANCH:       memory layer is named "branch"
 327  * @EDAC_MC_LAYER_CHANNEL:      memory layer is named "channel"
 328  * @EDAC_MC_LAYER_SLOT:         memory layer is named "slot"
 329  * @EDAC_MC_LAYER_CHIP_SELECT:  memory layer is named "chip select"
 330  * @EDAC_MC_LAYER_ALL_MEM:      memory layout is unknown. All memory is mapped
 331  *                              as a single memory area. This is used when
 332  *                              retrieving errors from a firmware driven driver.
 333  *
 334  * This enum is used by the drivers to tell edac_mc_sysfs what name should
 335  * be used when describing a memory stick location.
 336  */
 337 enum edac_mc_layer_type {
 338         EDAC_MC_LAYER_BRANCH,
 339         EDAC_MC_LAYER_CHANNEL,
 340         EDAC_MC_LAYER_SLOT,
 341         EDAC_MC_LAYER_CHIP_SELECT,
 342         EDAC_MC_LAYER_ALL_MEM,
 343 };
 344
 345 /**
 346  * struct edac_mc_layer - describes the memory controller hierarchy
 347  * @type:               layer type
 348  * @size:               number of components per layer. For example,
 349  *                      if the channel layer has two channels, size = 2
 350  * @is_virt_csrow:      This layer is part of the "csrow" when old API
 351  *                      compatibility mode is enabled. Otherwise, it is
 352  *                      a channel
 353  */
 354 struct edac_mc_layer {
 355         enum edac_mc_layer_type type;
 356         unsigned                size;
 357         bool                    is_virt_csrow;
 358 };
 359
 360 /*
 361  * Maximum number of layers used by the memory controller to uniquely
 362  * identify a single memory stick.
 363  * NOTE: Changing this constant requires not only to change the constant
 364  * below, but also to change the existing code at the core, as there are
 365  * some code there that are optimized for 3 layers.
 366  */
 367 #define EDAC_MAX_LAYERS         3
 368
 369 struct dimm_info {
 370         struct device dev;
 371
 372         char label[EDAC_MC_LABEL_LEN + 1];      /* DIMM label on motherboard */
 373
 374         /* Memory location data */
 375         unsigned int location[EDAC_MAX_LAYERS];
 376
 377         struct mem_ctl_info *mci;       /* the parent */
 378         unsigned int idx;               /* index within the parent dimm array */
 379
 380         u32 grain;              /* granularity of reported error in bytes */
 381         enum dev_type dtype;    /* memory device type */
 382         enum mem_type mtype;    /* memory dimm type */
 383         enum edac_type edac_mode;       /* EDAC mode for this dimm */
 384
 385         u32 nr_pages;                   /* number of pages on this dimm */
 386
 387         unsigned int csrow, cschannel;  /* Points to the old API data */
 388
 389         u16 smbios_handle;              /* Handle for SMBIOS type 17 */
 390
 391         u32 ce_count;
 392         u32 ue_count;
 393 };
 394
 395 /**
 396  * struct rank_info - contains the information for one DIMM rank
 397  *
 398  * @chan_idx:   channel number where the rank is (typically, 0 or 1)
 399  * @ce_count:   number of correctable errors for this rank
 400  * @csrow:      A pointer to the chip select row structure (the parent
 401  *              structure). The location of the rank is given by
 402  *              the (csrow->csrow_idx, chan_idx) vector.
 403  * @dimm:       A pointer to the DIMM structure, where the DIMM label
 404  *              information is stored.
 405  *
 406  * FIXME: Currently, the EDAC core model will assume one DIMM per rank.
 407  *        This is a bad assumption, but it makes this patch easier. Later
 408  *        patches in this series will fix this issue.
 409  */
 410 struct rank_info {
 411         int chan_idx;
 412         struct csrow_info *csrow;
 413         struct dimm_info *dimm;
 414
 415         u32 ce_count;           /* Correctable Errors for this csrow */
 416 };
 417
 418 struct csrow_info {
 419         struct device dev;
 420
 421         /* Used only by edac_mc_find_csrow_by_page() */
 422         unsigned long first_page;       /* first page number in csrow */
 423         unsigned long last_page;        /* last page number in csrow */
 424         unsigned long page_mask;        /* used for interleaving -
 425                                          * 0UL for non intlv */
 426
 427         int csrow_idx;                  /* the chip-select row */
 428
 429         u32 ue_count;           /* Uncorrectable Errors for this csrow */
 430         u32 ce_count;           /* Correctable Errors for this csrow */
 431
 432         struct mem_ctl_info *mci;       /* the parent */
 433
 434         /* channel information for this csrow */
 435         u32 nr_channels;
 436         struct rank_info **channels;
 437 };
 438
 439 /*
 440  * struct errcount_attribute - used to store the several error counts
 441  */
 442 struct errcount_attribute_data {
 443         int n_layers;
 444         int pos[EDAC_MAX_LAYERS];
 445         int layer0, layer1, layer2;
 446 };
 447
 448 /**
 449  * struct edac_raw_error_desc - Raw error report structure
 450  * @grain:                      minimum granularity for an error report, in bytes
 451  * @error_count:                number of errors of the same type
 452  * @type:                       severity of the error (CE/UE/Fatal)
 453  * @top_layer:                  top layer of the error (layer[0])
 454  * @mid_layer:                  middle layer of the error (layer[1])
 455  * @low_layer:                  low layer of the error (layer[2])
 456  * @page_frame_number:          page where the error happened
 457  * @offset_in_page:             page offset
 458  * @syndrome:                   syndrome of the error (or 0 if unknown or if
 459  *                              the syndrome is not applicable)
 460  * @msg:                        error message
 461  * @location:                   location of the error
 462  * @label:                      label of the affected DIMM(s)
 463  * @other_detail:               other driver-specific detail about the error
 464  */
 465 struct edac_raw_error_desc {
 466         char location[LOCATION_SIZE];
 467         char label[(EDAC_MC_LABEL_LEN + 1 + sizeof(OTHER_LABEL)) * EDAC_MAX_LABELS];
 468         long grain;
 469
 470         u16 error_count;
 471         enum hw_event_mc_err_type type;
 472         int top_layer;
 473         int mid_layer;
 474         int low_layer;
 475         unsigned long page_frame_number;
 476         unsigned long offset_in_page;
 477         unsigned long syndrome;
 478         const char *msg;
 479         const char *other_detail;
 480 };
 481
 482 /* MEMORY controller information structure
 483  */
 484 struct mem_ctl_info {
 485         struct device                   dev;
 486         struct bus_type                 *bus;
 487
 488         struct list_head link;  /* for global list of mem_ctl_info structs */
 489
 490         struct module *owner;   /* Module owner of this control struct */
 491
 492         unsigned long mtype_cap;        /* memory types supported by mc */
 493         unsigned long edac_ctl_cap;     /* Mem controller EDAC capabilities */
 494         unsigned long edac_cap; /* configuration capabilities - this is
 495                                  * closely related to edac_ctl_cap.  The
 496                                  * difference is that the controller may be
 497                                  * capable of s4ecd4ed which would be listed
 498                                  * in edac_ctl_cap, but if channels aren't
 499                                  * capable of s4ecd4ed then the edac_cap would
 500                                  * not have that capability.
 501                                  */
 502         unsigned long scrub_cap;        /* chipset scrub capabilities */
 503         enum scrub_type scrub_mode;     /* current scrub mode */
 504
 505         /* Translates sdram memory scrub rate given in bytes/sec to the
 506            internal representation and configures whatever else needs
 507            to be configured.
 508          */
 509         int (*set_sdram_scrub_rate) (struct mem_ctl_info * mci, u32 bw);
 510
 511         /* Get the current sdram memory scrub rate from the internal
 512            representation and converts it to the closest matching
 513            bandwidth in bytes/sec.
 514          */
 515         int (*get_sdram_scrub_rate) (struct mem_ctl_info * mci);
 516
 517
 518         /* pointer to edac checking routine */
 519         void (*edac_check) (struct mem_ctl_info * mci);
 520
 521         /*
 522          * Remaps memory pages: controller pages to physical pages.
 523          * For most MC's, this will be NULL.
 524          */
 525         /* FIXME - why not send the phys page to begin with? */
 526         unsigned long (*ctl_page_to_phys) (struct mem_ctl_info * mci,
 527                                            unsigned long page);
 528         int mc_idx;
 529         struct csrow_info **csrows;
 530         unsigned int nr_csrows, num_cschannel;
 531
 532         /*
 533          * Memory Controller hierarchy
 534          *
 535          * There are basically two types of memory controller: the ones that
 536          * sees memory sticks ("dimms"), and the ones that sees memory ranks.
 537          * All old memory controllers enumerate memories per rank, but most
 538          * of the recent drivers enumerate memories per DIMM, instead.
 539          * When the memory controller is per rank, csbased is true.
 540          */
 541         unsigned int n_layers;
 542         struct edac_mc_layer *layers;
 543         bool csbased;
 544
 545         /*
 546          * DIMM info. Will eventually remove the entire csrows_info some day
 547          */
 548         unsigned int tot_dimms;
 549         struct dimm_info **dimms;
 550
 551         /*
 552          * FIXME - what about controllers on other busses? - IDs must be
 553          * unique.  dev pointer should be sufficiently unique, but
 554          * BUS:SLOT.FUNC numbers may not be unique.
 555          */
 556         struct device *pdev;
 557         const char *mod_name;
 558         const char *ctl_name;
 559         const char *dev_name;
 560         void *pvt_info;
 561         unsigned long start_time;       /* mci load start time (in jiffies) */
 562
 563         /*
 564          * drivers shouldn't access those fields directly, as the core
 565          * already handles that.
 566          */
 567         u32 ce_noinfo_count, ue_noinfo_count;
 568         u32 ue_mc, ce_mc;
 569
 570         struct completion complete;
 571
 572         /* Additional top controller level attributes, but specified
 573          * by the low level driver.
 574          *
 575          * Set by the low level driver to provide attributes at the
 576          * controller level.
 577          * An array of structures, NULL terminated
 578          *
 579          * If attributes are desired, then set to array of attributes
 580          * If no attributes are desired, leave NULL
 581          */
 582         const struct mcidev_sysfs_attribute *mc_driver_sysfs_attributes;
 583
 584         /* work struct for this MC */
 585         struct delayed_work work;
 586
 587         /*
 588          * Used to report an error - by being at the global struct
 589          * makes the memory allocated by the EDAC core
 590          */
 591         struct edac_raw_error_desc error_desc;
 592
 593         /* the internal state of this controller instance */
 594         int op_state;
 595
 596         struct dentry *debugfs;
 597         u8 fake_inject_layer[EDAC_MAX_LAYERS];
 598         bool fake_inject_ue;
 599         u16 fake_inject_count;
 600 };
 601
 602 #define mci_for_each_dimm(mci, dimm)                            \
 603         for ((dimm) = (mci)->dimms[0];                          \
 604              (dimm);                                            \
 605              (dimm) = (dimm)->idx + 1 < (mci)->tot_dimms        \
 606                      ? (mci)->dimms[(dimm)->idx + 1]            \
 607                      : NULL)
 608
 609 /**
 610  * edac_get_dimm - Get DIMM info from a memory controller given by
 611  *                 [layer0,layer1,layer2] position
 612  *
 613  * @mci:        MC descriptor struct mem_ctl_info
 614  * @layer0:     layer0 position
 615  * @layer1:     layer1 position. Unused if n_layers < 2
 616  * @layer2:     layer2 position. Unused if n_layers < 3
 617  *
 618  * For 1 layer, this function returns "dimms[layer0]";
 619  *
 620  * For 2 layers, this function is similar to allocating a two-dimensional
 621  * array and returning "dimms[layer0][layer1]";
 622  *
 623  * For 3 layers, this function is similar to allocating a tri-dimensional
 624  * array and returning "dimms[layer0][layer1][layer2]";
 625  */
 626 static inline struct dimm_info *edac_get_dimm(struct mem_ctl_info *mci,
 627         int layer0, int layer1, int layer2)
 628 {
 629         int index;
 630
 631         if (layer0 < 0
 632             || (mci->n_layers > 1 && layer1 < 0)
 633             || (mci->n_layers > 2 && layer2 < 0))
 634                 return NULL;
 635
 636         index = layer0;
 637
 638         if (mci->n_layers > 1)
 639                 index = index * mci->layers[1].size + layer1;
 640
 641         if (mci->n_layers > 2)
 642                 index = index * mci->layers[2].size + layer2;
 643
 644         if (index < 0 || index >= mci->tot_dimms)
 645                 return NULL;
 646
 647         if (WARN_ON_ONCE(mci->dimms[index]->idx != index))
 648                 return NULL;
 649
 650         return mci->dimms[index];
 651 }
 652 #endif /* _LINUX_EDAC_H_ */