LXR linux/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
  19enum 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
  88static inline int do_sqbs(u64 token, unsigned char state, int queue,
  89                          int *start, int *count)
  90{
  91        unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
  92        unsigned long _ccq = *count;
  93
  94        asm volatile(
  95                "       lgr     1,%[token]\n"
  96                "       .insn   rsy,0xeb000000008a,%[qs],%[ccq],0(%[state])"
  97                : [ccq] "+&d" (_ccq), [qs] "+&d" (_queuestart)
  98                : [state] "d" ((unsigned long)state), [token] "d" (token)
  99                : "memory", "cc", "1");
 100        *count = _ccq & 0xff;
 101        *start = _queuestart & 0xff;
 102
 103        return (_ccq >> 32) & 0xff;
 104}
 105
 106static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 107                          int *start, int *count, int ack)
 108{
 109        unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 110        unsigned long _state = (unsigned long)ack << 63;
 111        unsigned long _ccq = *count;
 112
 113        asm volatile(
 114                "       lgr     1,%[token]\n"
 115                "       .insn   rrf,0xb99c0000,%[qs],%[state],%[ccq],0"
 116                : [ccq] "+&d" (_ccq), [qs] "+&d" (_queuestart),
 117                  [state] "+&d" (_state)
 118                : [token] "d" (token)
 119                : "memory", "cc", "1");
 120        *count = _ccq & 0xff;
 121        *start = _queuestart & 0xff;
 122        *state = _state & 0xff;
 123
 124        return (_ccq >> 32) & 0xff;
 125}
 126
 127struct qdio_irq;
 128
 129struct siga_flag {
 130        u8 input:1;
 131        u8 output:1;
 132        u8 sync:1;
 133        u8 sync_after_ai:1;
 134        u8 sync_out_after_pci:1;
 135        u8:3;
 136} __attribute__ ((packed));
 137
 138struct qdio_dev_perf_stat {
 139        unsigned int adapter_int;
 140        unsigned int qdio_int;
 141        unsigned int pci_request_int;
 142
 143        unsigned int tasklet_outbound;
 144
 145        unsigned int siga_read;
 146        unsigned int siga_write;
 147        unsigned int siga_sync;
 148
 149        unsigned int inbound_call;
 150        unsigned int stop_polling;
 151        unsigned int inbound_queue_full;
 152        unsigned int outbound_call;
 153        unsigned int outbound_handler;
 154        unsigned int outbound_queue_full;
 155        unsigned int fast_requeue;
 156        unsigned int target_full;
 157        unsigned int eqbs;
 158        unsigned int eqbs_partial;
 159        unsigned int sqbs;
 160        unsigned int sqbs_partial;
 161        unsigned int int_discarded;
 162} ____cacheline_aligned;
 163
 164struct qdio_queue_perf_stat {
 165        /* Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128. */
 166        unsigned int nr_sbals[8];
 167        unsigned int nr_sbal_error;
 168        unsigned int nr_sbal_nop;
 169        unsigned int nr_sbal_total;
 170};
 171
 172enum qdio_irq_poll_states {
 173        QDIO_IRQ_DISABLED,
 174};
 175
 176struct qdio_input_q {
 177        /* Batch of SBALs that we processed while polling the queue: */
 178        unsigned int batch_start;
 179        unsigned int batch_count;
 180};
 181
 182struct qdio_output_q {
 183        /* PCIs are enabled for the queue */
 184        int pci_out_enabled;
 185        /* timer to check for more outbound work */
 186        struct timer_list timer;
 187        /* tasklet to check for completions */
 188        struct tasklet_struct tasklet;
 189};
 190
 191/*
 192 * Note on cache alignment: grouped slsb and write mostly data at the beginning
 193 * sbal[] is read-only and starts on a new cacheline followed by read mostly.
 194 */
 195struct qdio_q {
 196        struct slsb slsb;
 197
 198        union {
 199                struct qdio_input_q in;
 200                struct qdio_output_q out;
 201        } u;
 202
 203        /*
 204         * inbound: next buffer the program should check for
 205         * outbound: next buffer to check if adapter processed it
 206         */
 207        int first_to_check;
 208
 209        /* number of buffers in use by the adapter */
 210        atomic_t nr_buf_used;
 211
 212        /* last scan of the queue */
 213        u64 timestamp;
 214
 215        struct qdio_queue_perf_stat q_stats;
 216
 217        struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
 218
 219        /* queue number */
 220        int nr;
 221
 222        /* bitmask of queue number */
 223        int mask;
 224
 225        /* input or output queue */
 226        int is_input_q;
 227
 228        /* upper-layer program handler */
 229        qdio_handler_t (*handler);
 230
 231        struct qdio_irq *irq_ptr;
 232        struct sl *sl;
 233        /*
 234         * A page is allocated under this pointer and used for slib and sl.
 235         * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
 236         */
 237        struct slib *slib;
 238} __attribute__ ((aligned(256)));
 239
 240struct qdio_irq {
 241        struct qib qib;
 242        u32 *dsci;              /* address of device state change indicator */
 243        struct ccw_device *cdev;
 244        struct list_head entry;         /* list of thinint devices */
 245        struct dentry *debugfs_dev;
 246        u64 last_data_irq_time;
 247
 248        unsigned long int_parm;
 249        struct subchannel_id schid;
 250        unsigned long sch_token;        /* QEBSM facility */
 251
 252        enum qdio_irq_states state;
 253
 254        struct siga_flag siga_flag;     /* siga sync information from qdioac */
 255
 256        int nr_input_qs;
 257        int nr_output_qs;
 258
 259        struct ccw1 ccw;
 260        struct ciw equeue;
 261        struct ciw aqueue;
 262
 263        struct qdio_ssqd_desc ssqd_desc;
 264        void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 265
 266        unsigned int scan_threshold;    /* used SBALs before tasklet schedule */
 267        int perf_stat_enabled;
 268
 269        struct qdr *qdr;
 270        unsigned long chsc_page;
 271
 272        struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 273        struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 274        unsigned int max_input_qs;
 275        unsigned int max_output_qs;
 276
 277        void (*irq_poll)(struct ccw_device *cdev, unsigned long data);
 278        unsigned long poll_state;
 279
 280        debug_info_t *debug_area;
 281        struct mutex setup_mutex;
 282        struct qdio_dev_perf_stat perf_stat;
 283};
 284
 285/* helper functions */
 286#define queue_type(q)   q->irq_ptr->qib.qfmt
 287#define SCH_NO(q)       (q->irq_ptr->schid.sch_no)
 288
 289#define is_thinint_irq(irq) \
 290        (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 291         css_general_characteristics.aif_osa)
 292
 293#define qperf(__qdev, __attr)   ((__qdev)->perf_stat.(__attr))
 294
 295#define QDIO_PERF_STAT_INC(__irq, __attr)                               \
 296({                                                                      \
 297        struct qdio_irq *qdev = __irq;                                  \
 298        if (qdev->perf_stat_enabled)                                    \
 299                (qdev->perf_stat.__attr)++;                             \
 300})
 301
 302#define qperf_inc(__q, __attr)  QDIO_PERF_STAT_INC((__q)->irq_ptr, __attr)
 303
 304static inline void account_sbals_error(struct qdio_q *q, int count)
 305{
 306        q->q_stats.nr_sbal_error += count;
 307        q->q_stats.nr_sbal_total += count;
 308}
 309
 310/* the highest iqdio queue is used for multicast */
 311static inline int multicast_outbound(struct qdio_q *q)
 312{
 313        return (q->irq_ptr->nr_output_qs > 1) &&
 314               (q->nr == q->irq_ptr->nr_output_qs - 1);
 315}
 316
 317static inline void qdio_deliver_irq(struct qdio_irq *irq)
 318{
 319        if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq->poll_state))
 320                irq->irq_poll(irq->cdev, irq->int_parm);
 321        else
 322                QDIO_PERF_STAT_INC(irq, int_discarded);
 323}
 324
 325#define pci_out_supported(irq) ((irq)->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 326#define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 327
 328#define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 329#define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 330#define need_siga_sync(q)               (unlikely(q->irq_ptr->siga_flag.sync))
 331#define need_siga_sync_after_ai(q)      \
 332        (unlikely(q->irq_ptr->siga_flag.sync_after_ai))
 333#define need_siga_sync_out_after_pci(q) \
 334        (unlikely(q->irq_ptr->siga_flag.sync_out_after_pci))
 335
 336#define for_each_input_queue(irq_ptr, q, i)             \
 337        for (i = 0; i < irq_ptr->nr_input_qs &&         \
 338                ({ q = irq_ptr->input_qs[i]; 1; }); i++)
 339#define for_each_output_queue(irq_ptr, q, i)            \
 340        for (i = 0; i < irq_ptr->nr_output_qs &&        \
 341                ({ q = irq_ptr->output_qs[i]; 1; }); i++)
 342
 343#define add_buf(bufnr, inc)     QDIO_BUFNR((bufnr) + (inc))
 344#define next_buf(bufnr)         add_buf(bufnr, 1)
 345#define sub_buf(bufnr, dec)     QDIO_BUFNR((bufnr) - (dec))
 346#define prev_buf(bufnr)         sub_buf(bufnr, 1)
 347
 348#define queue_irqs_enabled(q)                   \
 349        (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0)
 350#define queue_irqs_disabled(q)                  \
 351        (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0)
 352
 353extern u64 last_ai_time;
 354
 355/* prototypes for thin interrupt */
 356int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 357void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 358int qdio_thinint_init(void);
 359void qdio_thinint_exit(void);
 360int test_nonshared_ind(struct qdio_irq *);
 361
 362/* prototypes for setup */
 363void qdio_outbound_tasklet(struct tasklet_struct *t);
 364void qdio_outbound_timer(struct timer_list *t);
 365void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 366                      struct irb *irb);
 367int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 368                     int nr_output_qs);
 369void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 370int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 371                        struct subchannel_id *schid,
 372                        struct qdio_ssqd_desc *data);
 373int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data);
 374void qdio_shutdown_irq(struct qdio_irq *irq);
 375void qdio_print_subchannel_info(struct qdio_irq *irq_ptr);
 376void qdio_free_queues(struct qdio_irq *irq_ptr);
 377int qdio_setup_init(void);
 378void qdio_setup_exit(void);
 379
 380int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 381                        unsigned char *state);
 382#endif /* _CIO_QDIO_H */
 383