release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/include/asm/uv/uv_bau.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * SGI UV Broadcast Assist Unit definitions
   7  *
   8  * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
   9  */
  10
  11 #ifndef _ASM_X86_UV_UV_BAU_H
  12 #define _ASM_X86_UV_UV_BAU_H
  13
  14 #include <linux/bitmap.h>
  15 #define BITSPERBYTE 8
  16
  17 /*
  18  * Broadcast Assist Unit messaging structures
  19  *
  20  * Selective Broadcast activations are induced by software action
  21  * specifying a particular 8-descriptor "set" via a 6-bit index written
  22  * to an MMR.
  23  * Thus there are 64 unique 512-byte sets of SB descriptors - one set for
  24  * each 6-bit index value. These descriptor sets are mapped in sequence
  25  * starting with set 0 located at the address specified in the
  26  * BAU_SB_DESCRIPTOR_BASE register, set 1 is located at BASE + 512,
  27  * set 2 is at BASE + 2*512, set 3 at BASE + 3*512, and so on.
  28  *
  29  * We will use 31 sets, one for sending BAU messages from each of the 32
  30  * cpu's on the uvhub.
  31  *
  32  * TLB shootdown will use the first of the 8 descriptors of each set.
  33  * Each of the descriptors is 64 bytes in size (8*64 = 512 bytes in a set).
  34  */
  35
  36 #define UV_ITEMS_PER_DESCRIPTOR         8
  37 /* the 'throttle' to prevent the hardware stay-busy bug */
  38 #define MAX_BAU_CONCURRENT              3
  39 #define UV_CPUS_PER_ACT_STATUS          32
  40 #define UV_ACT_STATUS_MASK              0x3
  41 #define UV_ACT_STATUS_SIZE              2
  42 #define UV_ADP_SIZE                     32
  43 #define UV_DISTRIBUTION_SIZE            256
  44 #define UV_SW_ACK_NPENDING              8
  45 #define UV_NET_ENDPOINT_INTD            0x38
  46 #define UV_DESC_BASE_PNODE_SHIFT        49
  47 #define UV_PAYLOADQ_PNODE_SHIFT         49
  48 #define UV_PTC_BASENAME                 "sgi_uv/ptc_statistics"
  49 #define UV_BAU_BASENAME                 "sgi_uv/bau_tunables"
  50 #define UV_BAU_TUNABLES_DIR             "sgi_uv"
  51 #define UV_BAU_TUNABLES_FILE            "bau_tunables"
  52 #define WHITESPACE                      " \t\n"
  53 #define uv_physnodeaddr(x)              ((__pa((unsigned long)(x)) & uv_mmask))
  54 #define UV_ENABLE_INTD_SOFT_ACK_MODE_SHIFT 15
  55 #define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHIFT 16
  56 #define UV_INTD_SOFT_ACK_TIMEOUT_PERIOD 0x0000000009UL
  57 /* [19:16] SOFT_ACK timeout period  19: 1 is urgency 7  17:16 1 is multiplier */
  58 #define BAU_MISC_CONTROL_MULT_MASK 3
  59
  60 #define UVH_AGING_PRESCALE_SEL 0x000000b000UL
  61 /* [30:28] URGENCY_7  an index into a table of times */
  62 #define BAU_URGENCY_7_SHIFT 28
  63 #define BAU_URGENCY_7_MASK 7
  64
  65 #define UVH_TRANSACTION_TIMEOUT 0x000000b200UL
  66 /* [45:40] BAU - BAU transaction timeout select - a multiplier */
  67 #define BAU_TRANS_SHIFT 40
  68 #define BAU_TRANS_MASK 0x3f
  69
  70 /*
  71  * bits in UVH_LB_BAU_SB_ACTIVATION_STATUS_0/1
  72  */
  73 #define DESC_STATUS_IDLE                0
  74 #define DESC_STATUS_ACTIVE              1
  75 #define DESC_STATUS_DESTINATION_TIMEOUT 2
  76 #define DESC_STATUS_SOURCE_TIMEOUT      3
  77
  78 /*
  79  * delay for 'plugged' timeout retries, in microseconds
  80  */
  81 #define PLUGGED_DELAY                   10
  82
  83 /*
  84  * threshholds at which to use IPI to free resources
  85  */
  86 /* after this # consecutive 'plugged' timeouts, use IPI to release resources */
  87 #define PLUGSB4RESET 100
  88 /* after this many consecutive timeouts, use IPI to release resources */
  89 #define TIMEOUTSB4RESET 1
  90 /* at this number uses of IPI to release resources, giveup the request */
  91 #define IPI_RESET_LIMIT 1
  92 /* after this # consecutive successes, bump up the throttle if it was lowered */
  93 #define COMPLETE_THRESHOLD 5
  94
  95 /*
  96  * number of entries in the destination side payload queue
  97  */
  98 #define DEST_Q_SIZE                     20
  99 /*
 100  * number of destination side software ack resources
 101  */
 102 #define DEST_NUM_RESOURCES              8
 103 #define MAX_CPUS_PER_NODE               32
 104 /*
 105  * completion statuses for sending a TLB flush message
 106  */
 107 #define FLUSH_RETRY_PLUGGED             1
 108 #define FLUSH_RETRY_TIMEOUT             2
 109 #define FLUSH_GIVEUP                    3
 110 #define FLUSH_COMPLETE                  4
 111
 112 /*
 113  * tuning the action when the numalink network is extremely delayed
 114  */
 115 #define CONGESTED_RESPONSE_US 1000 /* 'long' response time, in microseconds */
 116 #define CONGESTED_REPS 10 /* long delays averaged over this many broadcasts */
 117 #define CONGESTED_PERIOD 30 /* time for the bau to be disabled, in seconds */
 118
 119 /*
 120  * Distribution: 32 bytes (256 bits) (bytes 0-0x1f of descriptor)
 121  * If the 'multilevel' flag in the header portion of the descriptor
 122  * has been set to 0, then endpoint multi-unicast mode is selected.
 123  * The distribution specification (32 bytes) is interpreted as a 256-bit
 124  * distribution vector. Adjacent bits correspond to consecutive even numbered
 125  * nodeIDs. The result of adding the index of a given bit to the 15-bit
 126  * 'base_dest_nodeid' field of the header corresponds to the
 127  * destination nodeID associated with that specified bit.
 128  */
 129 struct bau_target_uvhubmask {
 130         unsigned long bits[BITS_TO_LONGS(UV_DISTRIBUTION_SIZE)];
 131 };
 132
 133 /*
 134  * mask of cpu's on a uvhub
 135  * (during initialization we need to check that unsigned long has
 136  *  enough bits for max. cpu's per uvhub)
 137  */
 138 struct bau_local_cpumask {
 139         unsigned long bits;
 140 };
 141
 142 /*
 143  * Payload: 16 bytes (128 bits) (bytes 0x20-0x2f of descriptor)
 144  * only 12 bytes (96 bits) of the payload area are usable.
 145  * An additional 3 bytes (bits 27:4) of the header address are carried
 146  * to the next bytes of the destination payload queue.
 147  * And an additional 2 bytes of the header Suppl_A field are also
 148  * carried to the destination payload queue.
 149  * But the first byte of the Suppl_A becomes bits 127:120 (the 16th byte)
 150  * of the destination payload queue, which is written by the hardware
 151  * with the s/w ack resource bit vector.
 152  * [ effective message contents (16 bytes (128 bits) maximum), not counting
 153  *   the s/w ack bit vector  ]
 154  */
 155
 156 /*
 157  * The payload is software-defined for INTD transactions
 158  */
 159 struct bau_msg_payload {
 160         unsigned long address;          /* signifies a page or all TLB's
 161                                                 of the cpu */
 162         /* 64 bits */
 163         unsigned short sending_cpu;     /* filled in by sender */
 164         /* 16 bits */
 165         unsigned short acknowledge_count;/* filled in by destination */
 166         /* 16 bits */
 167         unsigned int reserved1:32;      /* not usable */
 168 };
 169
 170
 171 /*
 172  * Message header:  16 bytes (128 bits) (bytes 0x30-0x3f of descriptor)
 173  * see table 4.2.3.0.1 in broacast_assist spec.
 174  */
 175 struct bau_msg_header {
 176         unsigned int dest_subnodeid:6;  /* must be 0x10, for the LB */
 177         /* bits 5:0 */
 178         unsigned int base_dest_nodeid:15; /* nasid (pnode<<1) of */
 179         /* bits 20:6 */                   /* first bit in uvhub map */
 180         unsigned int command:8; /* message type */
 181         /* bits 28:21 */
 182                                 /* 0x38: SN3net EndPoint Message */
 183         unsigned int rsvd_1:3;  /* must be zero */
 184         /* bits 31:29 */
 185                                 /* int will align on 32 bits */
 186         unsigned int rsvd_2:9;  /* must be zero */
 187         /* bits 40:32 */
 188                                 /* Suppl_A is 56-41 */
 189         unsigned int sequence:16;/* message sequence number */
 190         /* bits 56:41 */        /* becomes bytes 16-17 of msg */
 191                                 /* Address field (96:57) is never used as an
 192                                    address (these are address bits 42:3) */
 193
 194         unsigned int rsvd_3:1;  /* must be zero */
 195         /* bit 57 */
 196                                 /* address bits 27:4 are payload */
 197         /* these next 24  (58-81) bits become bytes 12-14 of msg */
 198
 199         /* bits 65:58 land in byte 12 */
 200         unsigned int replied_to:1;/* sent as 0 by the source to byte 12 */
 201         /* bit 58 */
 202         unsigned int msg_type:3; /* software type of the message*/
 203         /* bits 61:59 */
 204         unsigned int canceled:1; /* message canceled, resource to be freed*/
 205         /* bit 62 */
 206         unsigned int payload_1a:1;/* not currently used */
 207         /* bit 63 */
 208         unsigned int payload_1b:2;/* not currently used */
 209         /* bits 65:64 */
 210
 211         /* bits 73:66 land in byte 13 */
 212         unsigned int payload_1ca:6;/* not currently used */
 213         /* bits 71:66 */
 214         unsigned int payload_1c:2;/* not currently used */
 215         /* bits 73:72 */
 216
 217         /* bits 81:74 land in byte 14 */
 218         unsigned int payload_1d:6;/* not currently used */
 219         /* bits 79:74 */
 220         unsigned int payload_1e:2;/* not currently used */
 221         /* bits 81:80 */
 222
 223         unsigned int rsvd_4:7;  /* must be zero */
 224         /* bits 88:82 */
 225         unsigned int sw_ack_flag:1;/* software acknowledge flag */
 226         /* bit 89 */
 227                                 /* INTD trasactions at destination are to
 228                                    wait for software acknowledge */
 229         unsigned int rsvd_5:6;  /* must be zero */
 230         /* bits 95:90 */
 231         unsigned int rsvd_6:5;  /* must be zero */
 232         /* bits 100:96 */
 233         unsigned int int_both:1;/* if 1, interrupt both sockets on the uvhub */
 234         /* bit 101*/
 235         unsigned int fairness:3;/* usually zero */
 236         /* bits 104:102 */
 237         unsigned int multilevel:1;      /* multi-level multicast format */
 238         /* bit 105 */
 239                                 /* 0 for TLB: endpoint multi-unicast messages */
 240         unsigned int chaining:1;/* next descriptor is part of this activation*/
 241         /* bit 106 */
 242         unsigned int rsvd_7:21; /* must be zero */
 243         /* bits 127:107 */
 244 };
 245
 246 /* see msg_type: */
 247 #define MSG_NOOP 0
 248 #define MSG_REGULAR 1
 249 #define MSG_RETRY 2
 250
 251 /*
 252  * The activation descriptor:
 253  * The format of the message to send, plus all accompanying control
 254  * Should be 64 bytes
 255  */
 256 struct bau_desc {
 257         struct bau_target_uvhubmask distribution;
 258         /*
 259          * message template, consisting of header and payload:
 260          */
 261         struct bau_msg_header header;
 262         struct bau_msg_payload payload;
 263 };
 264 /*
 265  *   -payload--    ---------header------
 266  *   bytes 0-11    bits 41-56  bits 58-81
 267  *       A           B  (2)      C (3)
 268  *
 269  *            A/B/C are moved to:
 270  *       A            C          B
 271  *   bytes 0-11  bytes 12-14  bytes 16-17  (byte 15 filled in by hw as vector)
 272  *   ------------payload queue-----------
 273  */
 274
 275 /*
 276  * The payload queue on the destination side is an array of these.
 277  * With BAU_MISC_CONTROL set for software acknowledge mode, the messages
 278  * are 32 bytes (2 micropackets) (256 bits) in length, but contain only 17
 279  * bytes of usable data, including the sw ack vector in byte 15 (bits 127:120)
 280  * (12 bytes come from bau_msg_payload, 3 from payload_1, 2 from
 281  *  sw_ack_vector and payload_2)
 282  * "Enabling Software Acknowledgment mode (see Section 4.3.3 Software
 283  *  Acknowledge Processing) also selects 32 byte (17 bytes usable) payload
 284  *  operation."
 285  */
 286 struct bau_payload_queue_entry {
 287         unsigned long address;          /* signifies a page or all TLB's
 288                                                 of the cpu */
 289         /* 64 bits, bytes 0-7 */
 290
 291         unsigned short sending_cpu;     /* cpu that sent the message */
 292         /* 16 bits, bytes 8-9 */
 293
 294         unsigned short acknowledge_count; /* filled in by destination */
 295         /* 16 bits, bytes 10-11 */
 296
 297         /* these next 3 bytes come from bits 58-81 of the message header */
 298         unsigned short replied_to:1;    /* sent as 0 by the source */
 299         unsigned short msg_type:3;      /* software message type */
 300         unsigned short canceled:1;      /* sent as 0 by the source */
 301         unsigned short unused1:3;       /* not currently using */
 302         /* byte 12 */
 303
 304         unsigned char unused2a;         /* not currently using */
 305         /* byte 13 */
 306         unsigned char unused2;          /* not currently using */
 307         /* byte 14 */
 308
 309         unsigned char sw_ack_vector;    /* filled in by the hardware */
 310         /* byte 15 (bits 127:120) */
 311
 312         unsigned short sequence;        /* message sequence number */
 313         /* bytes 16-17 */
 314         unsigned char unused4[2];       /* not currently using bytes 18-19 */
 315         /* bytes 18-19 */
 316
 317         int number_of_cpus;             /* filled in at destination */
 318         /* 32 bits, bytes 20-23 (aligned) */
 319
 320         unsigned char unused5[8];       /* not using */
 321         /* bytes 24-31 */
 322 };
 323
 324 struct msg_desc {
 325         struct bau_payload_queue_entry *msg;
 326         int msg_slot;
 327         int sw_ack_slot;
 328         struct bau_payload_queue_entry *va_queue_first;
 329         struct bau_payload_queue_entry *va_queue_last;
 330 };
 331
 332 struct reset_args {
 333         int sender;
 334 };
 335
 336 /*
 337  * This structure is allocated per_cpu for UV TLB shootdown statistics.
 338  */
 339 struct ptc_stats {
 340         /* sender statistics */
 341         unsigned long s_giveup; /* number of fall backs to IPI-style flushes */
 342         unsigned long s_requestor; /* number of shootdown requests */
 343         unsigned long s_stimeout; /* source side timeouts */
 344         unsigned long s_dtimeout; /* destination side timeouts */
 345         unsigned long s_time; /* time spent in sending side */
 346         unsigned long s_retriesok; /* successful retries */
 347         unsigned long s_ntargcpu; /* total number of cpu's targeted */
 348         unsigned long s_ntargself; /* times the sending cpu was targeted */
 349         unsigned long s_ntarglocals; /* targets of cpus on the local blade */
 350         unsigned long s_ntargremotes; /* targets of cpus on remote blades */
 351         unsigned long s_ntarglocaluvhub; /* targets of the local hub */
 352         unsigned long s_ntargremoteuvhub; /* remotes hubs targeted */
 353         unsigned long s_ntarguvhub; /* total number of uvhubs targeted */
 354         unsigned long s_ntarguvhub16; /* number of times target hubs >= 16*/
 355         unsigned long s_ntarguvhub8; /* number of times target hubs >= 8 */
 356         unsigned long s_ntarguvhub4; /* number of times target hubs >= 4 */
 357         unsigned long s_ntarguvhub2; /* number of times target hubs >= 2 */
 358         unsigned long s_ntarguvhub1; /* number of times target hubs == 1 */
 359         unsigned long s_resets_plug; /* ipi-style resets from plug state */
 360         unsigned long s_resets_timeout; /* ipi-style resets from timeouts */
 361         unsigned long s_busy; /* status stayed busy past s/w timer */
 362         unsigned long s_throttles; /* waits in throttle */
 363         unsigned long s_retry_messages; /* retry broadcasts */
 364         unsigned long s_bau_reenabled; /* for bau enable/disable */
 365         unsigned long s_bau_disabled; /* for bau enable/disable */
 366         /* destination statistics */
 367         unsigned long d_alltlb; /* times all tlb's on this cpu were flushed */
 368         unsigned long d_onetlb; /* times just one tlb on this cpu was flushed */
 369         unsigned long d_multmsg; /* interrupts with multiple messages */
 370         unsigned long d_nomsg; /* interrupts with no message */
 371         unsigned long d_time; /* time spent on destination side */
 372         unsigned long d_requestee; /* number of messages processed */
 373         unsigned long d_retries; /* number of retry messages processed */
 374         unsigned long d_canceled; /* number of messages canceled by retries */
 375         unsigned long d_nocanceled; /* retries that found nothing to cancel */
 376         unsigned long d_resets; /* number of ipi-style requests processed */
 377         unsigned long d_rcanceled; /* number of messages canceled by resets */
 378 };
 379
 380 /*
 381  * one per-cpu; to locate the software tables
 382  */
 383 struct bau_control {
 384         struct bau_desc *descriptor_base;
 385         struct bau_payload_queue_entry *va_queue_first;
 386         struct bau_payload_queue_entry *va_queue_last;
 387         struct bau_payload_queue_entry *bau_msg_head;
 388         struct bau_control *uvhub_master;
 389         struct bau_control *socket_master;
 390         struct ptc_stats *statp;
 391         unsigned long timeout_interval;
 392         unsigned long set_bau_on_time;
 393         atomic_t active_descriptor_count;
 394         int plugged_tries;
 395         int timeout_tries;
 396         int ipi_attempts;
 397         int conseccompletes;
 398         int baudisabled;
 399         int set_bau_off;
 400         short cpu;
 401         short uvhub_cpu;
 402         short uvhub;
 403         short cpus_in_socket;
 404         short cpus_in_uvhub;
 405         unsigned short message_number;
 406         unsigned short uvhub_quiesce;
 407         short socket_acknowledge_count[DEST_Q_SIZE];
 408         cycles_t send_message;
 409         spinlock_t uvhub_lock;
 410         spinlock_t queue_lock;
 411         /* tunables */
 412         int max_bau_concurrent;
 413         int max_bau_concurrent_constant;
 414         int plugged_delay;
 415         int plugsb4reset;
 416         int timeoutsb4reset;
 417         int ipi_reset_limit;
 418         int complete_threshold;
 419         int congested_response_us;
 420         int congested_reps;
 421         int congested_period;
 422         cycles_t period_time;
 423         long period_requests;
 424 };
 425
 426 static inline int bau_uvhub_isset(int uvhub, struct bau_target_uvhubmask *dstp)
 427 {
 428         return constant_test_bit(uvhub, &dstp->bits[0]);
 429 }
 430 static inline void bau_uvhub_set(int uvhub, struct bau_target_uvhubmask *dstp)
 431 {
 432         __set_bit(uvhub, &dstp->bits[0]);
 433 }
 434 static inline void bau_uvhubs_clear(struct bau_target_uvhubmask *dstp,
 435                                     int nbits)
 436 {
 437         bitmap_zero(&dstp->bits[0], nbits);
 438 }
 439 static inline int bau_uvhub_weight(struct bau_target_uvhubmask *dstp)
 440 {
 441         return bitmap_weight((unsigned long *)&dstp->bits[0],
 442                                 UV_DISTRIBUTION_SIZE);
 443 }
 444
 445 static inline void bau_cpubits_clear(struct bau_local_cpumask *dstp, int nbits)
 446 {
 447         bitmap_zero(&dstp->bits, nbits);
 448 }
 449
 450 #define cpubit_isset(cpu, bau_local_cpumask) \
 451         test_bit((cpu), (bau_local_cpumask).bits)
 452
 453 extern void uv_bau_message_intr1(void);
 454 extern void uv_bau_timeout_intr1(void);
 455
 456 struct atomic_short {
 457         short counter;
 458 };
 459
 460 /**
 461  * atomic_read_short - read a short atomic variable
 462  * @v: pointer of type atomic_short
 463  *
 464  * Atomically reads the value of @v.
 465  */
 466 static inline int atomic_read_short(const struct atomic_short *v)
 467 {
 468         return v->counter;
 469 }
 470
 471 /**
 472  * atomic_add_short_return - add and return a short int
 473  * @i: short value to add
 474  * @v: pointer of type atomic_short
 475  *
 476  * Atomically adds @i to @v and returns @i + @v
 477  */
 478 static inline int atomic_add_short_return(short i, struct atomic_short *v)
 479 {
 480         short __i = i;
 481         asm volatile(LOCK_PREFIX "xaddw %0, %1"
 482                         : "+r" (i), "+m" (v->counter)
 483                         : : "memory");
 484         return i + __i;
 485 }
 486
 487 #endif /* _ASM_X86_UV_UV_BAU_H */