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
  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_WRITEM        0x03
  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         /* Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128. */
 169         unsigned int nr_sbals[8];
 170         unsigned int nr_sbal_error;
 171         unsigned int nr_sbal_nop;
 172         unsigned int nr_sbal_total;
 173 };
 174
 175 enum qdio_irq_poll_states {
 176         QDIO_IRQ_DISABLED,
 177 };
 178
 179 struct qdio_input_q {
 180         /* Batch of SBALs that we processed while polling the queue: */
 181         unsigned int batch_start;
 182         unsigned int batch_count;
 183 };
 184
 185 struct qdio_output_q {
 186         /* PCIs are enabled for the queue */
 187         int pci_out_enabled;
 188         /* cq: use asynchronous output buffers */
 189         int use_cq;
 190         /* cq: aobs used for particual SBAL */
 191         struct qaob **aobs;
 192         /* cq: sbal state related to asynchronous operation */
 193         struct qdio_outbuf_state *sbal_state;
 194         /* timer to check for more outbound work */
 195         struct timer_list timer;
 196 };
 197
 198 /*
 199  * Note on cache alignment: grouped slsb and write mostly data at the beginning
 200  * sbal[] is read-only and starts on a new cacheline followed by read mostly.
 201  */
 202 struct qdio_q {
 203         struct slsb slsb;
 204
 205         union {
 206                 struct qdio_input_q in;
 207                 struct qdio_output_q out;
 208         } u;
 209
 210         /*
 211          * inbound: next buffer the program should check for
 212          * outbound: next buffer to check if adapter processed it
 213          */
 214         int first_to_check;
 215
 216         /* number of buffers in use by the adapter */
 217         atomic_t nr_buf_used;
 218
 219         /* error condition during a data transfer */
 220         unsigned int qdio_error;
 221
 222         /* last scan of the queue */
 223         u64 timestamp;
 224
 225         struct tasklet_struct tasklet;
 226         struct qdio_queue_perf_stat q_stats;
 227
 228         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
 229
 230         /* queue number */
 231         int nr;
 232
 233         /* bitmask of queue number */
 234         int mask;
 235
 236         /* input or output queue */
 237         int is_input_q;
 238
 239         /* upper-layer program handler */
 240         qdio_handler_t (*handler);
 241
 242         struct qdio_irq *irq_ptr;
 243         struct sl *sl;
 244         /*
 245          * A page is allocated under this pointer and used for slib and sl.
 246          * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
 247          */
 248         struct slib *slib;
 249 } __attribute__ ((aligned(256)));
 250
 251 struct qdio_irq {
 252         struct qib qib;
 253         u32 *dsci;              /* address of device state change indicator */
 254         struct ccw_device *cdev;
 255         struct list_head entry;         /* list of thinint devices */
 256         struct dentry *debugfs_dev;
 257
 258         unsigned long int_parm;
 259         struct subchannel_id schid;
 260         unsigned long sch_token;        /* QEBSM facility */
 261
 262         enum qdio_irq_states state;
 263
 264         struct siga_flag siga_flag;     /* siga sync information from qdioac */
 265
 266         int nr_input_qs;
 267         int nr_output_qs;
 268
 269         struct ccw1 ccw;
 270         struct ciw equeue;
 271         struct ciw aqueue;
 272
 273         struct qdio_ssqd_desc ssqd_desc;
 274         void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 275
 276         unsigned int scan_threshold;    /* used SBALs before tasklet schedule */
 277         int perf_stat_enabled;
 278
 279         struct qdr *qdr;
 280         unsigned long chsc_page;
 281
 282         struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 283         struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 284         unsigned int max_input_qs;
 285         unsigned int max_output_qs;
 286
 287         void (*irq_poll)(struct ccw_device *cdev, unsigned long data);
 288         unsigned long poll_state;
 289
 290         debug_info_t *debug_area;
 291         struct mutex setup_mutex;
 292         struct qdio_dev_perf_stat perf_stat;
 293 };
 294
 295 /* helper functions */
 296 #define queue_type(q)   q->irq_ptr->qib.qfmt
 297 #define SCH_NO(q)       (q->irq_ptr->schid.sch_no)
 298
 299 #define is_thinint_irq(irq) \
 300         (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 301          css_general_characteristics.aif_osa)
 302
 303 #define qperf(__qdev, __attr)   ((__qdev)->perf_stat.(__attr))
 304
 305 #define QDIO_PERF_STAT_INC(__irq, __attr)                               \
 306 ({                                                                      \
 307         struct qdio_irq *qdev = __irq;                                  \
 308         if (qdev->perf_stat_enabled)                                    \
 309                 (qdev->perf_stat.__attr)++;                             \
 310 })
 311
 312 #define qperf_inc(__q, __attr)  QDIO_PERF_STAT_INC((__q)->irq_ptr, __attr)
 313
 314 static inline void account_sbals_error(struct qdio_q *q, int count)
 315 {
 316         q->q_stats.nr_sbal_error += count;
 317         q->q_stats.nr_sbal_total += count;
 318 }
 319
 320 /* the highest iqdio queue is used for multicast */
 321 static inline int multicast_outbound(struct qdio_q *q)
 322 {
 323         return (q->irq_ptr->nr_output_qs > 1) &&
 324                (q->nr == q->irq_ptr->nr_output_qs - 1);
 325 }
 326
 327 #define pci_out_supported(irq) ((irq)->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 328 #define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 329
 330 #define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 331 #define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 332 #define need_siga_sync(q)               (unlikely(q->irq_ptr->siga_flag.sync))
 333 #define need_siga_sync_after_ai(q)      \
 334         (unlikely(q->irq_ptr->siga_flag.sync_after_ai))
 335 #define need_siga_sync_out_after_pci(q) \
 336         (unlikely(q->irq_ptr->siga_flag.sync_out_after_pci))
 337
 338 #define for_each_input_queue(irq_ptr, q, i)             \
 339         for (i = 0; i < irq_ptr->nr_input_qs &&         \
 340                 ({ q = irq_ptr->input_qs[i]; 1; }); i++)
 341 #define for_each_output_queue(irq_ptr, q, i)            \
 342         for (i = 0; i < irq_ptr->nr_output_qs &&        \
 343                 ({ q = irq_ptr->output_qs[i]; 1; }); i++)
 344
 345 #define add_buf(bufnr, inc)     QDIO_BUFNR((bufnr) + (inc))
 346 #define next_buf(bufnr)         add_buf(bufnr, 1)
 347 #define sub_buf(bufnr, dec)     QDIO_BUFNR((bufnr) - (dec))
 348 #define prev_buf(bufnr)         sub_buf(bufnr, 1)
 349
 350 #define queue_irqs_enabled(q)                   \
 351         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0)
 352 #define queue_irqs_disabled(q)                  \
 353         (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0)
 354
 355 extern u64 last_ai_time;
 356
 357 /* prototypes for thin interrupt */
 358 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 359 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 360 void tiqdio_add_device(struct qdio_irq *irq_ptr);
 361 void tiqdio_remove_device(struct qdio_irq *irq_ptr);
 362 void tiqdio_inbound_processing(unsigned long q);
 363 int qdio_thinint_init(void);
 364 void qdio_thinint_exit(void);
 365 int test_nonshared_ind(struct qdio_irq *);
 366
 367 /* prototypes for setup */
 368 void qdio_inbound_processing(unsigned long data);
 369 void qdio_outbound_processing(unsigned long data);
 370 void qdio_outbound_timer(struct timer_list *t);
 371 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 372                       struct irb *irb);
 373 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 374                      int nr_output_qs);
 375 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 376 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 377                         struct subchannel_id *schid,
 378                         struct qdio_ssqd_desc *data);
 379 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data);
 380 void qdio_shutdown_irq(struct qdio_irq *irq);
 381 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr);
 382 void qdio_free_queues(struct qdio_irq *irq_ptr);
 383 void qdio_free_async_data(struct qdio_irq *irq_ptr);
 384 int qdio_setup_init(void);
 385 void qdio_setup_exit(void);
 386 int qdio_enable_async_operation(struct qdio_output_q *q);
 387 void qdio_disable_async_operation(struct qdio_output_q *q);
 388 struct qaob *qdio_allocate_aob(void);
 389
 390 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 391                         unsigned char *state);
 392 #endif /* _CIO_QDIO_H */