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_INPUT_THRESHOLD            (500 << 12)     /* 500 microseconds */
  18
  19 /*
  20  * if an asynchronous HiperSockets queue runs full, the 10 seconds timer wait
  21  * till next initiative to give transmitted skbs back to the stack is too long.
  22  * Therefore polling is started in case of multicast queue is filled more
  23  * than 50 percent.
  24  */
  25 #define QDIO_IQDIO_POLL_LVL             65      /* HS multicast queue */
  26
  27 enum qdio_irq_states {
  28         QDIO_IRQ_STATE_INACTIVE,
  29         QDIO_IRQ_STATE_ESTABLISHED,
  30         QDIO_IRQ_STATE_ACTIVE,
  31         QDIO_IRQ_STATE_STOPPED,
  32         QDIO_IRQ_STATE_CLEANUP,
  33         QDIO_IRQ_STATE_ERR,
  34         NR_QDIO_IRQ_STATES,
  35 };
  36
  37 /* used as intparm in do_IO */
  38 #define QDIO_DOING_ESTABLISH    1
  39 #define QDIO_DOING_ACTIVATE     2
  40 #define QDIO_DOING_CLEANUP      3
  41
  42 #define SLSB_STATE_NOT_INIT     0x0
  43 #define SLSB_STATE_EMPTY        0x1
  44 #define SLSB_STATE_PRIMED       0x2
  45 #define SLSB_STATE_HALTED       0xe
  46 #define SLSB_STATE_ERROR        0xf
  47 #define SLSB_TYPE_INPUT         0x0
  48 #define SLSB_TYPE_OUTPUT        0x20
  49 #define SLSB_OWNER_PROG         0x80
  50 #define SLSB_OWNER_CU           0x40
  51
  52 #define SLSB_P_INPUT_NOT_INIT   \
  53         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT)  /* 0x80 */
  54 #define SLSB_P_INPUT_ACK        \
  55         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)     /* 0x81 */
  56 #define SLSB_CU_INPUT_EMPTY     \
  57         (SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)       /* 0x41 */
  58 #define SLSB_P_INPUT_PRIMED     \
  59         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED)    /* 0x82 */
  60 #define SLSB_P_INPUT_HALTED     \
  61         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED)    /* 0x8e */
  62 #define SLSB_P_INPUT_ERROR      \
  63         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR)     /* 0x8f */
  64 #define SLSB_P_OUTPUT_NOT_INIT  \
  65         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */
  66 #define SLSB_P_OUTPUT_EMPTY     \
  67         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY)    /* 0xa1 */
  68 #define SLSB_CU_OUTPUT_PRIMED   \
  69         (SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED)     /* 0x62 */
  70 #define SLSB_P_OUTPUT_HALTED    \
  71         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED)   /* 0xae */
  72 #define SLSB_P_OUTPUT_ERROR     \
  73         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR)    /* 0xaf */
  74
  75 #define SLSB_ERROR_DURING_LOOKUP  0xff
  76
  77 /* additional CIWs returned by extended Sense-ID */
  78 #define CIW_TYPE_EQUEUE                 0x3 /* establish QDIO queues */
  79 #define CIW_TYPE_AQUEUE                 0x4 /* activate QDIO queues */
  80
  81 /* flags for st qdio sch data */
  82 #define CHSC_FLAG_QDIO_CAPABILITY       0x80
  83 #define CHSC_FLAG_VALIDITY              0x40
  84
  85 /* qdio adapter-characteristics-1 flag */
  86 #define AC1_SIGA_INPUT_NEEDED           0x40    /* process input queues */
  87 #define AC1_SIGA_OUTPUT_NEEDED          0x20    /* process output queues */
  88 #define AC1_SIGA_SYNC_NEEDED            0x10    /* ask hypervisor to sync */
  89 #define AC1_AUTOMATIC_SYNC_ON_THININT   0x08    /* set by hypervisor */
  90 #define AC1_AUTOMATIC_SYNC_ON_OUT_PCI   0x04    /* set by hypervisor */
  91 #define AC1_SC_QEBSM_AVAILABLE          0x02    /* available for subchannel */
  92 #define AC1_SC_QEBSM_ENABLED            0x01    /* enabled for subchannel */
  93
  94 #ifdef CONFIG_64BIT
  95 static inline int do_sqbs(u64 token, unsigned char state, int queue,
  96                           int *start, int *count)
  97 {
  98         register unsigned long _ccq asm ("0") = *count;
  99         register unsigned long _token asm ("1") = token;
 100         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 101
 102         asm volatile(
 103                 "       .insn   rsy,0xeb000000008A,%1,0,0(%2)"
 104                 : "+d" (_ccq), "+d" (_queuestart)
 105                 : "d" ((unsigned long)state), "d" (_token)
 106                 : "memory", "cc");
 107         *count = _ccq & 0xff;
 108         *start = _queuestart & 0xff;
 109
 110         return (_ccq >> 32) & 0xff;
 111 }
 112
 113 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 114                           int *start, int *count, int ack)
 115 {
 116         register unsigned long _ccq asm ("0") = *count;
 117         register unsigned long _token asm ("1") = token;
 118         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 119         unsigned long _state = (unsigned long)ack << 63;
 120
 121         asm volatile(
 122                 "       .insn   rrf,0xB99c0000,%1,%2,0,0"
 123                 : "+d" (_ccq), "+d" (_queuestart), "+d" (_state)
 124                 : "d" (_token)
 125                 : "memory", "cc");
 126         *count = _ccq & 0xff;
 127         *start = _queuestart & 0xff;
 128         *state = _state & 0xff;
 129
 130         return (_ccq >> 32) & 0xff;
 131 }
 132 #else
 133 static inline int do_sqbs(u64 token, unsigned char state, int queue,
 134                           int *start, int *count) { return 0; }
 135 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 136                           int *start, int *count, int ack) { return 0; }
 137 #endif /* CONFIG_64BIT */
 138
 139 struct qdio_irq;
 140
 141 struct siga_flag {
 142         u8 input:1;
 143         u8 output:1;
 144         u8 sync:1;
 145         u8 no_sync_ti:1;
 146         u8 no_sync_out_ti:1;
 147         u8 no_sync_out_pci:1;
 148         u8:2;
 149 } __attribute__ ((packed));
 150
 151 struct chsc_ssqd_area {
 152         struct chsc_header request;
 153         u16:10;
 154         u8 ssid:2;
 155         u8 fmt:4;
 156         u16 first_sch;
 157         u16:16;
 158         u16 last_sch;
 159         u32:32;
 160         struct chsc_header response;
 161         u32:32;
 162         struct qdio_ssqd_desc qdio_ssqd;
 163 } __attribute__ ((packed));
 164
 165 struct scssc_area {
 166         struct chsc_header request;
 167         u16 operation_code;
 168         u16:16;
 169         u32:32;
 170         u32:32;
 171         u64 summary_indicator_addr;
 172         u64 subchannel_indicator_addr;
 173         u32 ks:4;
 174         u32 kc:4;
 175         u32:21;
 176         u32 isc:3;
 177         u32 word_with_d_bit;
 178         u32:32;
 179         struct subchannel_id schid;
 180         u32 reserved[1004];
 181         struct chsc_header response;
 182         u32:32;
 183 } __attribute__ ((packed));
 184
 185 struct qdio_dev_perf_stat {
 186         unsigned int adapter_int;
 187         unsigned int qdio_int;
 188         unsigned int pci_request_int;
 189
 190         unsigned int tasklet_inbound;
 191         unsigned int tasklet_inbound_resched;
 192         unsigned int tasklet_inbound_resched2;
 193         unsigned int tasklet_outbound;
 194
 195         unsigned int siga_read;
 196         unsigned int siga_write;
 197         unsigned int siga_sync;
 198
 199         unsigned int inbound_call;
 200         unsigned int inbound_handler;
 201         unsigned int stop_polling;
 202         unsigned int inbound_queue_full;
 203         unsigned int outbound_call;
 204         unsigned int outbound_handler;
 205         unsigned int fast_requeue;
 206         unsigned int target_full;
 207         unsigned int eqbs;
 208         unsigned int eqbs_partial;
 209         unsigned int sqbs;
 210         unsigned int sqbs_partial;
 211         unsigned int int_discarded;
 212 } ____cacheline_aligned;
 213
 214 struct qdio_queue_perf_stat {
 215         /*
 216          * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128.
 217          * Since max. 127 SBALs are scanned reuse entry for 128 as queue full
 218          * aka 127 SBALs found.
 219          */
 220         unsigned int nr_sbals[8];
 221         unsigned int nr_sbal_error;
 222         unsigned int nr_sbal_nop;
 223         unsigned int nr_sbal_total;
 224 };
 225
 226 enum qdio_queue_irq_states {
 227         QDIO_QUEUE_IRQS_DISABLED,
 228 };
 229
 230 struct qdio_input_q {
 231         /* input buffer acknowledgement flag */
 232         int polling;
 233         /* first ACK'ed buffer */
 234         int ack_start;
 235         /* how much sbals are acknowledged with qebsm */
 236         int ack_count;
 237         /* last time of noticing incoming data */
 238         u64 timestamp;
 239         /* upper-layer polling flag */
 240         unsigned long queue_irq_state;
 241         /* callback to start upper-layer polling */
 242         void (*queue_start_poll) (struct ccw_device *, int, unsigned long);
 243 };
 244
 245 struct qdio_output_q {
 246         /* PCIs are enabled for the queue */
 247         int pci_out_enabled;
 248         /* IQDIO: output multiple buffers (enhanced SIGA) */
 249         int use_enh_siga;
 250         /* timer to check for more outbound work */
 251         struct timer_list timer;
 252 };
 253
 254 /*
 255  * Note on cache alignment: grouped slsb and write mostly data at the beginning
 256  * sbal[] is read-only and starts on a new cacheline followed by read mostly.
 257  */
 258 struct qdio_q {
 259         struct slsb slsb;
 260
 261         union {
 262                 struct qdio_input_q in;
 263                 struct qdio_output_q out;
 264         } u;
 265
 266         /*
 267          * inbound: next buffer the program should check for
 268          * outbound: next buffer to check if adapter processed it
 269          */
 270         int first_to_check;
 271
 272         /* first_to_check of the last time */
 273         int last_move;
 274
 275         /* beginning position for calling the program */
 276         int first_to_kick;
 277
 278         /* number of buffers in use by the adapter */
 279         atomic_t nr_buf_used;
 280
 281         /* error condition during a data transfer */
 282         unsigned int qdio_error;
 283
 284         struct tasklet_struct tasklet;
 285         struct qdio_queue_perf_stat q_stats;
 286
 287         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
 288
 289         /* queue number */
 290         int nr;
 291
 292         /* bitmask of queue number */
 293         int mask;
 294
 295         /* input or output queue */
 296         int is_input_q;
 297
 298         /* list of thinint input queues */
 299         struct list_head entry;
 300
 301         /* upper-layer program handler */
 302         qdio_handler_t (*handler);
 303
 304         struct dentry *debugfs_q;
 305         struct qdio_irq *irq_ptr;
 306         struct sl *sl;
 307         /*
 308          * A page is allocated under this pointer and used for slib and sl.
 309          * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
 310          */
 311         struct slib *slib;
 312 } __attribute__ ((aligned(256)));
 313
 314 struct qdio_irq {
 315         struct qib qib;
 316         u32 *dsci;              /* address of device state change indicator */
 317         struct ccw_device *cdev;
 318         struct dentry *debugfs_dev;
 319         struct dentry *debugfs_perf;
 320
 321         unsigned long int_parm;
 322         struct subchannel_id schid;
 323         unsigned long sch_token;        /* QEBSM facility */
 324
 325         enum qdio_irq_states state;
 326
 327         struct siga_flag siga_flag;     /* siga sync information from qdioac */
 328
 329         int nr_input_qs;
 330         int nr_output_qs;
 331
 332         struct ccw1 ccw;
 333         struct ciw equeue;
 334         struct ciw aqueue;
 335
 336         struct qdio_ssqd_desc ssqd_desc;
 337         void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 338
 339         int perf_stat_enabled;
 340
 341         struct qdr *qdr;
 342         unsigned long chsc_page;
 343
 344         struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 345         struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 346
 347         debug_info_t *debug_area;
 348         struct mutex setup_mutex;
 349         struct qdio_dev_perf_stat perf_stat;
 350 };
 351
 352 /* helper functions */
 353 #define queue_type(q)   q->irq_ptr->qib.qfmt
 354 #define SCH_NO(q)       (q->irq_ptr->schid.sch_no)
 355
 356 #define is_thinint_irq(irq) \
 357         (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 358          css_general_characteristics.aif_osa)
 359
 360 #define qperf(__qdev, __attr)   ((__qdev)->perf_stat.(__attr))
 361
 362 #define qperf_inc(__q, __attr)                                          \
 363 ({                                                                      \
 364         struct qdio_irq *qdev = (__q)->irq_ptr;                         \
 365         if (qdev->perf_stat_enabled)                                    \
 366                 (qdev->perf_stat.__attr)++;                             \
 367 })
 368
 369 static inline void account_sbals_error(struct qdio_q *q, int count)
 370 {
 371         q->q_stats.nr_sbal_error += count;
 372         q->q_stats.nr_sbal_total += count;
 373 }
 374
 375 /* the highest iqdio queue is used for multicast */
 376 static inline int multicast_outbound(struct qdio_q *q)
 377 {
 378         return (q->irq_ptr->nr_output_qs > 1) &&
 379                (q->nr == q->irq_ptr->nr_output_qs - 1);
 380 }
 381
 382 #define pci_out_supported(q) \
 383         (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 384 #define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 385
 386 #define need_siga_sync_thinint(q)       (!q->irq_ptr->siga_flag.no_sync_ti)
 387 #define need_siga_sync_out_thinint(q)   (!q->irq_ptr->siga_flag.no_sync_out_ti)
 388 #define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 389 #define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 390 #define need_siga_sync(q)               (q->irq_ptr->siga_flag.sync)
 391 #define siga_syncs_out_pci(q)           (q->irq_ptr->siga_flag.no_sync_out_pci)
 392
 393 #define for_each_input_queue(irq_ptr, q, i)     \
 394         for (i = 0, q = irq_ptr->input_qs[0];   \
 395                 i < irq_ptr->nr_input_qs;       \
 396                 q = irq_ptr->input_qs[++i])
 397 #define for_each_output_queue(irq_ptr, q, i)    \
 398         for (i = 0, q = irq_ptr->output_qs[0];  \
 399                 i < irq_ptr->nr_output_qs;      \
 400                 q = irq_ptr->output_qs[++i])
 401
 402 #define prev_buf(bufnr) \
 403         ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
 404 #define next_buf(bufnr) \
 405         ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
 406 #define add_buf(bufnr, inc) \
 407         ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
 408 #define sub_buf(bufnr, dec) \
 409         ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK)
 410
 411 #define queue_irqs_enabled(q)                   \
 412         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0)
 413 #define queue_irqs_disabled(q)                  \
 414         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0)
 415
 416 #define TIQDIO_SHARED_IND               63
 417
 418 /* device state change indicators */
 419 struct indicator_t {
 420         u32 ind;        /* u32 because of compare-and-swap performance */
 421         atomic_t count; /* use count, 0 or 1 for non-shared indicators */
 422 };
 423
 424 extern struct indicator_t *q_indicators;
 425
 426 static inline int shared_ind(struct qdio_irq *irq_ptr)
 427 {
 428         return irq_ptr->dsci == &q_indicators[TIQDIO_SHARED_IND].ind;
 429 }
 430
 431 /* prototypes for thin interrupt */
 432 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 433 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 434 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 435 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
 436 void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
 437 void tiqdio_inbound_processing(unsigned long q);
 438 int tiqdio_allocate_memory(void);
 439 void tiqdio_free_memory(void);
 440 int tiqdio_register_thinints(void);
 441 void tiqdio_unregister_thinints(void);
 442
 443 /* prototypes for setup */
 444 void qdio_inbound_processing(unsigned long data);
 445 void qdio_outbound_processing(unsigned long data);
 446 void qdio_outbound_timer(unsigned long data);
 447 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 448                       struct irb *irb);
 449 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 450                      int nr_output_qs);
 451 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 452 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 453                         struct subchannel_id *schid,
 454                         struct qdio_ssqd_desc *data);
 455 int qdio_setup_irq(struct qdio_initialize *init_data);
 456 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 457                                 struct ccw_device *cdev);
 458 void qdio_release_memory(struct qdio_irq *irq_ptr);
 459 int qdio_setup_create_sysfs(struct ccw_device *cdev);
 460 void qdio_setup_destroy_sysfs(struct ccw_device *cdev);
 461 int qdio_setup_init(void);
 462 void qdio_setup_exit(void);
 463
 464 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 465                         unsigned char *state);
 466 #endif /* _CIO_QDIO_H */