drivers/s390/cio/qdio.h

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