drivers/s390/cio/qdio.h

   1 /*
   2  * linux/drivers/s390/cio/qdio.h
   3  *
   4  * Copyright 2000,2009 IBM Corp.
   5  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   6  *            Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8 #ifndef _CIO_QDIO_H
   9 #define _CIO_QDIO_H
  10
  11 #include <asm/page.h>
  12 #include <asm/schid.h>
  13 #include <asm/debug.h>
  14 #include "chsc.h"
  15
  16 #define QDIO_BUSY_BIT_PATIENCE          (100 << 12)     /* 100 microseconds */
  17 #define QDIO_BUSY_BIT_RETRY_DELAY       10              /* 10 milliseconds */
  18 #define QDIO_BUSY_BIT_RETRIES           1000            /* = 10s retry time */
  19 #define QDIO_INPUT_THRESHOLD            (500 << 12)     /* 500 microseconds */
  20
  21 /*
  22  * if an asynchronous HiperSockets queue runs full, the 10 seconds timer wait
  23  * till next initiative to give transmitted skbs back to the stack is too long.
  24  * Therefore polling is started in case of multicast queue is filled more
  25  * than 50 percent.
  26  */
  27 #define QDIO_IQDIO_POLL_LVL             65      /* HS multicast queue */
  28
  29 enum qdio_irq_states {
  30         QDIO_IRQ_STATE_INACTIVE,
  31         QDIO_IRQ_STATE_ESTABLISHED,
  32         QDIO_IRQ_STATE_ACTIVE,
  33         QDIO_IRQ_STATE_STOPPED,
  34         QDIO_IRQ_STATE_CLEANUP,
  35         QDIO_IRQ_STATE_ERR,
  36         NR_QDIO_IRQ_STATES,
  37 };
  38
  39 /* used as intparm in do_IO */
  40 #define QDIO_DOING_ESTABLISH    1
  41 #define QDIO_DOING_ACTIVATE     2
  42 #define QDIO_DOING_CLEANUP      3
  43
  44 #define SLSB_STATE_NOT_INIT     0x0
  45 #define SLSB_STATE_EMPTY        0x1
  46 #define SLSB_STATE_PRIMED       0x2
  47 #define SLSB_STATE_PENDING      0x3
  48 #define SLSB_STATE_HALTED       0xe
  49 #define SLSB_STATE_ERROR        0xf
  50 #define SLSB_TYPE_INPUT         0x0
  51 #define SLSB_TYPE_OUTPUT        0x20
  52 #define SLSB_OWNER_PROG         0x80
  53 #define SLSB_OWNER_CU           0x40
  54
  55 #define SLSB_P_INPUT_NOT_INIT   \
  56         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT)  /* 0x80 */
  57 #define SLSB_P_INPUT_ACK        \
  58         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)     /* 0x81 */
  59 #define SLSB_CU_INPUT_EMPTY     \
  60         (SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)       /* 0x41 */
  61 #define SLSB_P_INPUT_PRIMED     \
  62         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED)    /* 0x82 */
  63 #define SLSB_P_INPUT_HALTED     \
  64         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED)    /* 0x8e */
  65 #define SLSB_P_INPUT_ERROR      \
  66         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR)     /* 0x8f */
  67 #define SLSB_P_OUTPUT_NOT_INIT  \
  68         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */
  69 #define SLSB_P_OUTPUT_EMPTY     \
  70         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY)    /* 0xa1 */
  71 #define SLSB_P_OUTPUT_PENDING \
  72         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_PENDING)  /* 0xa3 */
  73 #define SLSB_CU_OUTPUT_PRIMED   \
  74         (SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED)     /* 0x62 */
  75 #define SLSB_P_OUTPUT_HALTED    \
  76         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED)   /* 0xae */
  77 #define SLSB_P_OUTPUT_ERROR     \
  78         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR)    /* 0xaf */
  79
  80 #define SLSB_ERROR_DURING_LOOKUP  0xff
  81
  82 /* additional CIWs returned by extended Sense-ID */
  83 #define CIW_TYPE_EQUEUE                 0x3 /* establish QDIO queues */
  84 #define CIW_TYPE_AQUEUE                 0x4 /* activate QDIO queues */
  85
  86 /* flags for st qdio sch data */
  87 #define CHSC_FLAG_QDIO_CAPABILITY       0x80
  88 #define CHSC_FLAG_VALIDITY              0x40
  89
  90 /* SIGA flags */
  91 #define QDIO_SIGA_WRITE         0x00
  92 #define QDIO_SIGA_READ          0x01
  93 #define QDIO_SIGA_SYNC          0x02
  94 #define QDIO_SIGA_WRITEQ        0x04
  95 #define QDIO_SIGA_QEBSM_FLAG    0x80
  96
  97 #ifdef CONFIG_64BIT
  98 static inline int do_sqbs(u64 token, unsigned char state, int queue,
  99                           int *start, int *count)
 100 {
 101         register unsigned long _ccq asm ("0") = *count;
 102         register unsigned long _token asm ("1") = token;
 103         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 104
 105         asm volatile(
 106                 "       .insn   rsy,0xeb000000008A,%1,0,0(%2)"
 107                 : "+d" (_ccq), "+d" (_queuestart)
 108                 : "d" ((unsigned long)state), "d" (_token)
 109                 : "memory", "cc");
 110         *count = _ccq & 0xff;
 111         *start = _queuestart & 0xff;
 112
 113         return (_ccq >> 32) & 0xff;
 114 }
 115
 116 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 117                           int *start, int *count, int ack)
 118 {
 119         register unsigned long _ccq asm ("0") = *count;
 120         register unsigned long _token asm ("1") = token;
 121         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 122         unsigned long _state = (unsigned long)ack << 63;
 123
 124         asm volatile(
 125                 "       .insn   rrf,0xB99c0000,%1,%2,0,0"
 126                 : "+d" (_ccq), "+d" (_queuestart), "+d" (_state)
 127                 : "d" (_token)
 128                 : "memory", "cc");
 129         *count = _ccq & 0xff;
 130         *start = _queuestart & 0xff;
 131         *state = _state & 0xff;
 132
 133         return (_ccq >> 32) & 0xff;
 134 }
 135 #else
 136 static inline int do_sqbs(u64 token, unsigned char state, int queue,
 137                           int *start, int *count) { return 0; }
 138 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 139                           int *start, int *count, int ack) { return 0; }
 140 #endif /* CONFIG_64BIT */
 141
 142 struct qdio_irq;
 143
 144 struct siga_flag {
 145         u8 input:1;
 146         u8 output:1;
 147         u8 sync:1;
 148         u8 sync_after_ai:1;
 149         u8 sync_out_after_pci:1;
 150         u8:3;
 151 } __attribute__ ((packed));
 152
 153 struct chsc_ssqd_area {
 154         struct chsc_header request;
 155         u16:10;
 156         u8 ssid:2;
 157         u8 fmt:4;
 158         u16 first_sch;
 159         u16:16;
 160         u16 last_sch;
 161         u32:32;
 162         struct chsc_header response;
 163         u32:32;
 164         struct qdio_ssqd_desc qdio_ssqd;
 165 } __attribute__ ((packed));
 166
 167 struct scssc_area {
 168         struct chsc_header request;
 169         u16 operation_code;
 170         u16:16;
 171         u32:32;
 172         u32:32;
 173         u64 summary_indicator_addr;
 174         u64 subchannel_indicator_addr;
 175         u32 ks:4;
 176         u32 kc:4;
 177         u32:21;
 178         u32 isc:3;
 179         u32 word_with_d_bit;
 180         u32:32;
 181         struct subchannel_id schid;
 182         u32 reserved[1004];
 183         struct chsc_header response;
 184         u32:32;
 185 } __attribute__ ((packed));
 186
 187 struct qdio_dev_perf_stat {
 188         unsigned int adapter_int;
 189         unsigned int qdio_int;
 190         unsigned int pci_request_int;
 191
 192         unsigned int tasklet_inbound;
 193         unsigned int tasklet_inbound_resched;
 194         unsigned int tasklet_inbound_resched2;
 195         unsigned int tasklet_outbound;
 196
 197         unsigned int siga_read;
 198         unsigned int siga_write;
 199         unsigned int siga_sync;
 200
 201         unsigned int inbound_call;
 202         unsigned int inbound_handler;
 203         unsigned int stop_polling;
 204         unsigned int inbound_queue_full;
 205         unsigned int outbound_call;
 206         unsigned int outbound_handler;
 207         unsigned int outbound_queue_full;
 208         unsigned int fast_requeue;
 209         unsigned int target_full;
 210         unsigned int eqbs;
 211         unsigned int eqbs_partial;
 212         unsigned int sqbs;
 213         unsigned int sqbs_partial;
 214         unsigned int int_discarded;
 215 } ____cacheline_aligned;
 216
 217 struct qdio_queue_perf_stat {
 218         /*
 219          * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128.
 220          * Since max. 127 SBALs are scanned reuse entry for 128 as queue full
 221          * aka 127 SBALs found.
 222          */
 223         unsigned int nr_sbals[8];
 224         unsigned int nr_sbal_error;
 225         unsigned int nr_sbal_nop;
 226         unsigned int nr_sbal_total;
 227 };
 228
 229 enum qdio_queue_irq_states {
 230         QDIO_QUEUE_IRQS_DISABLED,
 231 };
 232
 233 struct qdio_input_q {
 234         /* input buffer acknowledgement flag */
 235         int polling;
 236         /* first ACK'ed buffer */
 237         int ack_start;
 238         /* how much sbals are acknowledged with qebsm */
 239         int ack_count;
 240         /* last time of noticing incoming data */
 241         u64 timestamp;
 242         /* upper-layer polling flag */
 243         unsigned long queue_irq_state;
 244         /* callback to start upper-layer polling */
 245         void (*queue_start_poll) (struct ccw_device *, int, unsigned long);
 246 };
 247
 248 struct qdio_output_q {
 249         /* PCIs are enabled for the queue */
 250         int pci_out_enabled;
 251         /* cq: use asynchronous output buffers */
 252         int use_cq;
 253         /* cq: aobs used for particual SBAL */
 254         struct qaob **aobs;
 255         /* cq: sbal state related to asynchronous operation */
 256         struct qdio_outbuf_state *sbal_state;
 257         /* timer to check for more outbound work */
 258         struct timer_list timer;
 259         /* used SBALs before tasklet schedule */
 260         int scan_threshold;
 261 };
 262
 263 /*
 264  * Note on cache alignment: grouped slsb and write mostly data at the beginning
 265  * sbal[] is read-only and starts on a new cacheline followed by read mostly.
 266  */
 267 struct qdio_q {
 268         struct slsb slsb;
 269
 270         union {
 271                 struct qdio_input_q in;
 272                 struct qdio_output_q out;
 273         } u;
 274
 275         /*
 276          * inbound: next buffer the program should check for
 277          * outbound: next buffer to check if adapter processed it
 278          */
 279         int first_to_check;
 280
 281         /* first_to_check of the last time */
 282         int last_move;
 283
 284         /* beginning position for calling the program */
 285         int first_to_kick;
 286
 287         /* number of buffers in use by the adapter */
 288         atomic_t nr_buf_used;
 289
 290         /* error condition during a data transfer */
 291         unsigned int qdio_error;
 292
 293         struct tasklet_struct tasklet;
 294         struct qdio_queue_perf_stat q_stats;
 295
 296         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
 297
 298         /* queue number */
 299         int nr;
 300
 301         /* bitmask of queue number */
 302         int mask;
 303
 304         /* input or output queue */
 305         int is_input_q;
 306
 307         /* list of thinint input queues */
 308         struct list_head entry;
 309
 310         /* upper-layer program handler */
 311         qdio_handler_t (*handler);
 312
 313         struct dentry *debugfs_q;
 314         struct qdio_irq *irq_ptr;
 315         struct sl *sl;
 316         /*
 317          * A page is allocated under this pointer and used for slib and sl.
 318          * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
 319          */
 320         struct slib *slib;
 321 } __attribute__ ((aligned(256)));
 322
 323 struct qdio_irq {
 324         struct qib qib;
 325         u32 *dsci;              /* address of device state change indicator */
 326         struct ccw_device *cdev;
 327         struct dentry *debugfs_dev;
 328         struct dentry *debugfs_perf;
 329
 330         unsigned long int_parm;
 331         struct subchannel_id schid;
 332         unsigned long sch_token;        /* QEBSM facility */
 333
 334         enum qdio_irq_states state;
 335
 336         struct siga_flag siga_flag;     /* siga sync information from qdioac */
 337
 338         int nr_input_qs;
 339         int nr_output_qs;
 340
 341         struct ccw1 ccw;
 342         struct ciw equeue;
 343         struct ciw aqueue;
 344
 345         struct qdio_ssqd_desc ssqd_desc;
 346         void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 347
 348         int perf_stat_enabled;
 349
 350         struct qdr *qdr;
 351         unsigned long chsc_page;
 352
 353         struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 354         struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 355
 356         debug_info_t *debug_area;
 357         struct mutex setup_mutex;
 358         struct qdio_dev_perf_stat perf_stat;
 359 };
 360
 361 /* helper functions */
 362 #define queue_type(q)   q->irq_ptr->qib.qfmt
 363 #define SCH_NO(q)       (q->irq_ptr->schid.sch_no)
 364
 365 #define is_thinint_irq(irq) \
 366         (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 367          css_general_characteristics.aif_osa)
 368
 369 #define qperf(__qdev, __attr)   ((__qdev)->perf_stat.(__attr))
 370
 371 #define qperf_inc(__q, __attr)                                          \
 372 ({                                                                      \
 373         struct qdio_irq *qdev = (__q)->irq_ptr;                         \
 374         if (qdev->perf_stat_enabled)                                    \
 375                 (qdev->perf_stat.__attr)++;                             \
 376 })
 377
 378 static inline void account_sbals_error(struct qdio_q *q, int count)
 379 {
 380         q->q_stats.nr_sbal_error += count;
 381         q->q_stats.nr_sbal_total += count;
 382 }
 383
 384 /* the highest iqdio queue is used for multicast */
 385 static inline int multicast_outbound(struct qdio_q *q)
 386 {
 387         return (q->irq_ptr->nr_output_qs > 1) &&
 388                (q->nr == q->irq_ptr->nr_output_qs - 1);
 389 }
 390
 391 #define pci_out_supported(q) \
 392         (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 393 #define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 394
 395 #define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 396 #define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 397 #define need_siga_sync(q)               (unlikely(q->irq_ptr->siga_flag.sync))
 398 #define need_siga_sync_after_ai(q)      \
 399         (unlikely(q->irq_ptr->siga_flag.sync_after_ai))
 400 #define need_siga_sync_out_after_pci(q) \
 401         (unlikely(q->irq_ptr->siga_flag.sync_out_after_pci))
 402
 403 #define for_each_input_queue(irq_ptr, q, i)     \
 404         for (i = 0, q = irq_ptr->input_qs[0];   \
 405                 i < irq_ptr->nr_input_qs;       \
 406                 q = irq_ptr->input_qs[++i])
 407 #define for_each_output_queue(irq_ptr, q, i)    \
 408         for (i = 0, q = irq_ptr->output_qs[0];  \
 409                 i < irq_ptr->nr_output_qs;      \
 410                 q = irq_ptr->output_qs[++i])
 411
 412 #define prev_buf(bufnr) \
 413         ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
 414 #define next_buf(bufnr) \
 415         ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
 416 #define add_buf(bufnr, inc) \
 417         ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
 418 #define sub_buf(bufnr, dec) \
 419         ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK)
 420
 421 #define queue_irqs_enabled(q)                   \
 422         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0)
 423 #define queue_irqs_disabled(q)                  \
 424         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0)
 425
 426 #define TIQDIO_SHARED_IND               63
 427
 428 /* device state change indicators */
 429 struct indicator_t {
 430         u32 ind;        /* u32 because of compare-and-swap performance */
 431         atomic_t count; /* use count, 0 or 1 for non-shared indicators */
 432 };
 433
 434 extern struct indicator_t *q_indicators;
 435
 436 static inline int has_multiple_inq_on_dsci(struct qdio_irq *irq)
 437 {
 438         return irq->nr_input_qs > 1;
 439 }
 440
 441 static inline int references_shared_dsci(struct qdio_irq *irq)
 442 {
 443         return irq->dsci == &q_indicators[TIQDIO_SHARED_IND].ind;
 444 }
 445
 446 static inline int shared_ind(struct qdio_q *q)
 447 {
 448         struct qdio_irq *i = q->irq_ptr;
 449         return references_shared_dsci(i) || has_multiple_inq_on_dsci(i);
 450 }
 451
 452 /* prototypes for thin interrupt */
 453 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 454 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 455 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 456 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
 457 void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
 458 void tiqdio_inbound_processing(unsigned long q);
 459 int tiqdio_allocate_memory(void);
 460 void tiqdio_free_memory(void);
 461 int tiqdio_register_thinints(void);
 462 void tiqdio_unregister_thinints(void);
 463
 464
 465 /* prototypes for setup */
 466 void qdio_inbound_processing(unsigned long data);
 467 void qdio_outbound_processing(unsigned long data);
 468 void qdio_outbound_timer(unsigned long data);
 469 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 470                       struct irb *irb);
 471 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 472                      int nr_output_qs);
 473 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 474 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 475                         struct subchannel_id *schid,
 476                         struct qdio_ssqd_desc *data);
 477 int qdio_setup_irq(struct qdio_initialize *init_data);
 478 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 479                                 struct ccw_device *cdev);
 480 void qdio_release_memory(struct qdio_irq *irq_ptr);
 481 int qdio_setup_create_sysfs(struct ccw_device *cdev);
 482 void qdio_setup_destroy_sysfs(struct ccw_device *cdev);
 483 int qdio_setup_init(void);
 484 void qdio_setup_exit(void);
 485 int qdio_enable_async_operation(struct qdio_output_q *q);
 486 void qdio_disable_async_operation(struct qdio_output_q *q);
 487 struct qaob *qdio_allocate_aob(void);
 488
 489 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 490                         unsigned char *state);
 491 #endif /* _CIO_QDIO_H */