drivers/s390/cio/qdio.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright IBM Corp. 2000, 2009
   4  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   5  *            Jan Glauber <jang@linux.vnet.ibm.com>
   6  */
   7 #ifndef _CIO_QDIO_H
   8 #define _CIO_QDIO_H
   9
  10 #include <asm/page.h>
  11 #include <asm/schid.h>
  12 #include <asm/debug.h>
  13 #include "chsc.h"
  14
  15 #define QDIO_BUSY_BIT_PATIENCE          (100 << 12)     /* 100 microseconds */
  16 #define QDIO_BUSY_BIT_RETRY_DELAY       10              /* 10 milliseconds */
  17 #define QDIO_BUSY_BIT_RETRIES           1000            /* = 10s retry time */
  18 #define QDIO_INPUT_THRESHOLD            (500 << 12)     /* 500 microseconds */
  19
  20 enum qdio_irq_states {
  21         QDIO_IRQ_STATE_INACTIVE,
  22         QDIO_IRQ_STATE_ESTABLISHED,
  23         QDIO_IRQ_STATE_ACTIVE,
  24         QDIO_IRQ_STATE_STOPPED,
  25         QDIO_IRQ_STATE_CLEANUP,
  26         QDIO_IRQ_STATE_ERR,
  27         NR_QDIO_IRQ_STATES,
  28 };
  29
  30 /* used as intparm in do_IO */
  31 #define QDIO_DOING_ESTABLISH    1
  32 #define QDIO_DOING_ACTIVATE     2
  33 #define QDIO_DOING_CLEANUP      3
  34
  35 #define SLSB_STATE_NOT_INIT     0x0
  36 #define SLSB_STATE_EMPTY        0x1
  37 #define SLSB_STATE_PRIMED       0x2
  38 #define SLSB_STATE_PENDING      0x3
  39 #define SLSB_STATE_HALTED       0xe
  40 #define SLSB_STATE_ERROR        0xf
  41 #define SLSB_TYPE_INPUT         0x0
  42 #define SLSB_TYPE_OUTPUT        0x20
  43 #define SLSB_OWNER_PROG         0x80
  44 #define SLSB_OWNER_CU           0x40
  45
  46 #define SLSB_P_INPUT_NOT_INIT   \
  47         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT)  /* 0x80 */
  48 #define SLSB_P_INPUT_ACK        \
  49         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)     /* 0x81 */
  50 #define SLSB_CU_INPUT_EMPTY     \
  51         (SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY)       /* 0x41 */
  52 #define SLSB_P_INPUT_PRIMED     \
  53         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED)    /* 0x82 */
  54 #define SLSB_P_INPUT_HALTED     \
  55         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED)    /* 0x8e */
  56 #define SLSB_P_INPUT_ERROR      \
  57         (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR)     /* 0x8f */
  58 #define SLSB_P_OUTPUT_NOT_INIT  \
  59         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */
  60 #define SLSB_P_OUTPUT_EMPTY     \
  61         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY)    /* 0xa1 */
  62 #define SLSB_P_OUTPUT_PENDING \
  63         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_PENDING)  /* 0xa3 */
  64 #define SLSB_CU_OUTPUT_PRIMED   \
  65         (SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED)     /* 0x62 */
  66 #define SLSB_P_OUTPUT_HALTED    \
  67         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED)   /* 0xae */
  68 #define SLSB_P_OUTPUT_ERROR     \
  69         (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR)    /* 0xaf */
  70
  71 #define SLSB_ERROR_DURING_LOOKUP  0xff
  72
  73 /* additional CIWs returned by extended Sense-ID */
  74 #define CIW_TYPE_EQUEUE                 0x3 /* establish QDIO queues */
  75 #define CIW_TYPE_AQUEUE                 0x4 /* activate QDIO queues */
  76
  77 /* flags for st qdio sch data */
  78 #define CHSC_FLAG_QDIO_CAPABILITY       0x80
  79 #define CHSC_FLAG_VALIDITY              0x40
  80
  81 /* SIGA flags */
  82 #define QDIO_SIGA_WRITE         0x00
  83 #define QDIO_SIGA_READ          0x01
  84 #define QDIO_SIGA_SYNC          0x02
  85 #define QDIO_SIGA_WRITEQ        0x04
  86 #define QDIO_SIGA_QEBSM_FLAG    0x80
  87
  88 static inline int do_sqbs(u64 token, unsigned char state, int queue,
  89                           int *start, int *count)
  90 {
  91         register unsigned long _ccq asm ("0") = *count;
  92         register unsigned long _token asm ("1") = token;
  93         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
  94
  95         asm volatile(
  96                 "       .insn   rsy,0xeb000000008A,%1,0,0(%2)"
  97                 : "+d" (_ccq), "+d" (_queuestart)
  98                 : "d" ((unsigned long)state), "d" (_token)
  99                 : "memory", "cc");
 100         *count = _ccq & 0xff;
 101         *start = _queuestart & 0xff;
 102
 103         return (_ccq >> 32) & 0xff;
 104 }
 105
 106 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 107                           int *start, int *count, int ack)
 108 {
 109         register unsigned long _ccq asm ("0") = *count;
 110         register unsigned long _token asm ("1") = token;
 111         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 112         unsigned long _state = (unsigned long)ack << 63;
 113
 114         asm volatile(
 115                 "       .insn   rrf,0xB99c0000,%1,%2,0,0"
 116                 : "+d" (_ccq), "+d" (_queuestart), "+d" (_state)
 117                 : "d" (_token)
 118                 : "memory", "cc");
 119         *count = _ccq & 0xff;
 120         *start = _queuestart & 0xff;
 121         *state = _state & 0xff;
 122
 123         return (_ccq >> 32) & 0xff;
 124 }
 125
 126 struct qdio_irq;
 127
 128 struct siga_flag {
 129         u8 input:1;
 130         u8 output:1;
 131         u8 sync:1;
 132         u8 sync_after_ai:1;
 133         u8 sync_out_after_pci:1;
 134         u8:3;
 135 } __attribute__ ((packed));
 136
 137 struct qdio_dev_perf_stat {
 138         unsigned int adapter_int;
 139         unsigned int qdio_int;
 140         unsigned int pci_request_int;
 141
 142         unsigned int tasklet_inbound;
 143         unsigned int tasklet_inbound_resched;
 144         unsigned int tasklet_inbound_resched2;
 145         unsigned int tasklet_outbound;
 146
 147         unsigned int siga_read;
 148         unsigned int siga_write;
 149         unsigned int siga_sync;
 150
 151         unsigned int inbound_call;
 152         unsigned int inbound_handler;
 153         unsigned int stop_polling;
 154         unsigned int inbound_queue_full;
 155         unsigned int outbound_call;
 156         unsigned int outbound_handler;
 157         unsigned int outbound_queue_full;
 158         unsigned int fast_requeue;
 159         unsigned int target_full;
 160         unsigned int eqbs;
 161         unsigned int eqbs_partial;
 162         unsigned int sqbs;
 163         unsigned int sqbs_partial;
 164         unsigned int int_discarded;
 165 } ____cacheline_aligned;
 166
 167 struct qdio_queue_perf_stat {
 168         /*
 169          * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128.
 170          * Since max. 127 SBALs are scanned reuse entry for 128 as queue full
 171          * aka 127 SBALs found.
 172          */
 173         unsigned int nr_sbals[8];
 174         unsigned int nr_sbal_error;
 175         unsigned int nr_sbal_nop;
 176         unsigned int nr_sbal_total;
 177 };
 178
 179 enum qdio_queue_irq_states {
 180         QDIO_QUEUE_IRQS_DISABLED,
 181 };
 182
 183 struct qdio_input_q {
 184         /* input buffer acknowledgement flag */
 185         int polling;
 186         /* first ACK'ed buffer */
 187         int ack_start;
 188         /* how much sbals are acknowledged with qebsm */
 189         int ack_count;
 190         /* last time of noticing incoming data */
 191         u64 timestamp;
 192         /* upper-layer polling flag */
 193         unsigned long queue_irq_state;
 194         /* callback to start upper-layer polling */
 195         void (*queue_start_poll) (struct ccw_device *, int, unsigned long);
 196 };
 197
 198 struct qdio_output_q {
 199         /* PCIs are enabled for the queue */
 200         int pci_out_enabled;
 201         /* cq: use asynchronous output buffers */
 202         int use_cq;
 203         /* cq: aobs used for particual SBAL */
 204         struct qaob **aobs;
 205         /* cq: sbal state related to asynchronous operation */
 206         struct qdio_outbuf_state *sbal_state;
 207         /* timer to check for more outbound work */
 208         struct timer_list timer;
 209         /* used SBALs before tasklet schedule */
 210         int scan_threshold;
 211 };
 212
 213 /*
 214  * Note on cache alignment: grouped slsb and write mostly data at the beginning
 215  * sbal[] is read-only and starts on a new cacheline followed by read mostly.
 216  */
 217 struct qdio_q {
 218         struct slsb slsb;
 219
 220         union {
 221                 struct qdio_input_q in;
 222                 struct qdio_output_q out;
 223         } u;
 224
 225         /*
 226          * inbound: next buffer the program should check for
 227          * outbound: next buffer to check if adapter processed it
 228          */
 229         int first_to_check;
 230
 231         /* first_to_check of the last time */
 232         int last_move;
 233
 234         /* beginning position for calling the program */
 235         int first_to_kick;
 236
 237         /* number of buffers in use by the adapter */
 238         atomic_t nr_buf_used;
 239
 240         /* error condition during a data transfer */
 241         unsigned int qdio_error;
 242
 243         /* last scan of the queue */
 244         u64 timestamp;
 245
 246         struct tasklet_struct tasklet;
 247         struct qdio_queue_perf_stat q_stats;
 248
 249         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
 250
 251         /* queue number */
 252         int nr;
 253
 254         /* bitmask of queue number */
 255         int mask;
 256
 257         /* input or output queue */
 258         int is_input_q;
 259
 260         /* list of thinint input queues */
 261         struct list_head entry;
 262
 263         /* upper-layer program handler */
 264         qdio_handler_t (*handler);
 265
 266         struct dentry *debugfs_q;
 267         struct qdio_irq *irq_ptr;
 268         struct sl *sl;
 269         /*
 270          * A page is allocated under this pointer and used for slib and sl.
 271          * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
 272          */
 273         struct slib *slib;
 274 } __attribute__ ((aligned(256)));
 275
 276 struct qdio_irq {
 277         struct qib qib;
 278         u32 *dsci;              /* address of device state change indicator */
 279         struct ccw_device *cdev;
 280         struct dentry *debugfs_dev;
 281         struct dentry *debugfs_perf;
 282
 283         unsigned long int_parm;
 284         struct subchannel_id schid;
 285         unsigned long sch_token;        /* QEBSM facility */
 286
 287         enum qdio_irq_states state;
 288
 289         struct siga_flag siga_flag;     /* siga sync information from qdioac */
 290
 291         int nr_input_qs;
 292         int nr_output_qs;
 293
 294         struct ccw1 ccw;
 295         struct ciw equeue;
 296         struct ciw aqueue;
 297
 298         struct qdio_ssqd_desc ssqd_desc;
 299         void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 300
 301         int perf_stat_enabled;
 302
 303         struct qdr *qdr;
 304         unsigned long chsc_page;
 305
 306         struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 307         struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 308
 309         debug_info_t *debug_area;
 310         struct mutex setup_mutex;
 311         struct qdio_dev_perf_stat perf_stat;
 312 };
 313
 314 /* helper functions */
 315 #define queue_type(q)   q->irq_ptr->qib.qfmt
 316 #define SCH_NO(q)       (q->irq_ptr->schid.sch_no)
 317
 318 #define is_thinint_irq(irq) \
 319         (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 320          css_general_characteristics.aif_osa)
 321
 322 #define qperf(__qdev, __attr)   ((__qdev)->perf_stat.(__attr))
 323
 324 #define qperf_inc(__q, __attr)                                          \
 325 ({                                                                      \
 326         struct qdio_irq *qdev = (__q)->irq_ptr;                         \
 327         if (qdev->perf_stat_enabled)                                    \
 328                 (qdev->perf_stat.__attr)++;                             \
 329 })
 330
 331 static inline void account_sbals_error(struct qdio_q *q, int count)
 332 {
 333         q->q_stats.nr_sbal_error += count;
 334         q->q_stats.nr_sbal_total += count;
 335 }
 336
 337 /* the highest iqdio queue is used for multicast */
 338 static inline int multicast_outbound(struct qdio_q *q)
 339 {
 340         return (q->irq_ptr->nr_output_qs > 1) &&
 341                (q->nr == q->irq_ptr->nr_output_qs - 1);
 342 }
 343
 344 #define pci_out_supported(q) \
 345         (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 346 #define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 347
 348 #define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 349 #define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 350 #define need_siga_sync(q)               (unlikely(q->irq_ptr->siga_flag.sync))
 351 #define need_siga_sync_after_ai(q)      \
 352         (unlikely(q->irq_ptr->siga_flag.sync_after_ai))
 353 #define need_siga_sync_out_after_pci(q) \
 354         (unlikely(q->irq_ptr->siga_flag.sync_out_after_pci))
 355
 356 #define for_each_input_queue(irq_ptr, q, i)             \
 357         for (i = 0; i < irq_ptr->nr_input_qs &&         \
 358                 ({ q = irq_ptr->input_qs[i]; 1; }); i++)
 359 #define for_each_output_queue(irq_ptr, q, i)            \
 360         for (i = 0; i < irq_ptr->nr_output_qs &&        \
 361                 ({ q = irq_ptr->output_qs[i]; 1; }); i++)
 362
 363 #define prev_buf(bufnr) \
 364         ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
 365 #define next_buf(bufnr) \
 366         ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
 367 #define add_buf(bufnr, inc) \
 368         ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
 369 #define sub_buf(bufnr, dec) \
 370         ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK)
 371
 372 #define queue_irqs_enabled(q)                   \
 373         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0)
 374 #define queue_irqs_disabled(q)                  \
 375         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0)
 376
 377 extern u64 last_ai_time;
 378
 379 /* prototypes for thin interrupt */
 380 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 381 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 382 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 383 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
 384 void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
 385 void tiqdio_inbound_processing(unsigned long q);
 386 int tiqdio_allocate_memory(void);
 387 void tiqdio_free_memory(void);
 388 int tiqdio_register_thinints(void);
 389 void tiqdio_unregister_thinints(void);
 390 void clear_nonshared_ind(struct qdio_irq *);
 391 int test_nonshared_ind(struct qdio_irq *);
 392
 393 /* prototypes for setup */
 394 void qdio_inbound_processing(unsigned long data);
 395 void qdio_outbound_processing(unsigned long data);
 396 void qdio_outbound_timer(struct timer_list *t);
 397 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 398                       struct irb *irb);
 399 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 400                      int nr_output_qs);
 401 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 402 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 403                         struct subchannel_id *schid,
 404                         struct qdio_ssqd_desc *data);
 405 int qdio_setup_irq(struct qdio_initialize *init_data);
 406 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 407                                 struct ccw_device *cdev);
 408 void qdio_release_memory(struct qdio_irq *irq_ptr);
 409 int qdio_setup_create_sysfs(struct ccw_device *cdev);
 410 void qdio_setup_destroy_sysfs(struct ccw_device *cdev);
 411 int qdio_setup_init(void);
 412 void qdio_setup_exit(void);
 413 int qdio_enable_async_operation(struct qdio_output_q *q);
 414 void qdio_disable_async_operation(struct qdio_output_q *q);
 415 struct qaob *qdio_allocate_aob(void);
 416
 417 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 418                         unsigned char *state);
 419 #endif /* _CIO_QDIO_H */