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     /* 100 microseconds */
  17 #define QDIO_INPUT_THRESHOLD            500     /* 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 } ____cacheline_aligned;
 212
 213 struct qdio_queue_perf_stat {
 214         /*
 215          * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128.
 216          * Since max. 127 SBALs are scanned reuse entry for 128 as queue full
 217          * aka 127 SBALs found.
 218          */
 219         unsigned int nr_sbals[8];
 220         unsigned int nr_sbal_error;
 221         unsigned int nr_sbal_nop;
 222         unsigned int nr_sbal_total;
 223 };
 224
 225 struct qdio_input_q {
 226         /* input buffer acknowledgement flag */
 227         int polling;
 228         /* first ACK'ed buffer */
 229         int ack_start;
 230         /* how much sbals are acknowledged with qebsm */
 231         int ack_count;
 232         /* last time of noticing incoming data */
 233         u64 timestamp;
 234 };
 235
 236 struct qdio_output_q {
 237         /* PCIs are enabled for the queue */
 238         int pci_out_enabled;
 239         /* IQDIO: output multiple buffers (enhanced SIGA) */
 240         int use_enh_siga;
 241         /* timer to check for more outbound work */
 242         struct timer_list timer;
 243 };
 244
 245 /*
 246  * Note on cache alignment: grouped slsb and write mostly data at the beginning
 247  * sbal[] is read-only and starts on a new cacheline followed by read mostly.
 248  */
 249 struct qdio_q {
 250         struct slsb slsb;
 251
 252         union {
 253                 struct qdio_input_q in;
 254                 struct qdio_output_q out;
 255         } u;
 256
 257         /*
 258          * inbound: next buffer the program should check for
 259          * outbound: next buffer to check if adapter processed it
 260          */
 261         int first_to_check;
 262
 263         /* first_to_check of the last time */
 264         int last_move;
 265
 266         /* beginning position for calling the program */
 267         int first_to_kick;
 268
 269         /* number of buffers in use by the adapter */
 270         atomic_t nr_buf_used;
 271
 272         /* error condition during a data transfer */
 273         unsigned int qdio_error;
 274
 275         struct tasklet_struct tasklet;
 276         struct qdio_queue_perf_stat q_stats;
 277
 278         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
 279
 280         /* queue number */
 281         int nr;
 282
 283         /* bitmask of queue number */
 284         int mask;
 285
 286         /* input or output queue */
 287         int is_input_q;
 288
 289         /* list of thinint input queues */
 290         struct list_head entry;
 291
 292         /* upper-layer program handler */
 293         qdio_handler_t (*handler);
 294
 295         struct dentry *debugfs_q;
 296         struct qdio_irq *irq_ptr;
 297         struct sl *sl;
 298         /*
 299          * Warning: Leave this member at the end so it won't be cleared in
 300          * qdio_fill_qs. A page is allocated under this pointer and used for
 301          * slib and sl. slib is 2048 bytes big and sl points to offset
 302          * PAGE_SIZE / 2.
 303          */
 304         struct slib *slib;
 305 } __attribute__ ((aligned(256)));
 306
 307 struct qdio_irq {
 308         struct qib qib;
 309         u32 *dsci;              /* address of device state change indicator */
 310         struct ccw_device *cdev;
 311         struct dentry *debugfs_dev;
 312         struct dentry *debugfs_perf;
 313
 314         unsigned long int_parm;
 315         struct subchannel_id schid;
 316         unsigned long sch_token;        /* QEBSM facility */
 317
 318         enum qdio_irq_states state;
 319
 320         struct siga_flag siga_flag;     /* siga sync information from qdioac */
 321
 322         int nr_input_qs;
 323         int nr_output_qs;
 324
 325         struct ccw1 ccw;
 326         struct ciw equeue;
 327         struct ciw aqueue;
 328
 329         struct qdio_ssqd_desc ssqd_desc;
 330         void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 331
 332         int perf_stat_enabled;
 333
 334         struct qdr *qdr;
 335         unsigned long chsc_page;
 336
 337         struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 338         struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 339
 340         debug_info_t *debug_area;
 341         struct mutex setup_mutex;
 342         struct qdio_dev_perf_stat perf_stat;
 343 };
 344
 345 /* helper functions */
 346 #define queue_type(q)   q->irq_ptr->qib.qfmt
 347 #define SCH_NO(q)       (q->irq_ptr->schid.sch_no)
 348
 349 #define is_thinint_irq(irq) \
 350         (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 351          css_general_characteristics.aif_osa)
 352
 353 #define qperf(__qdev, __attr)   ((__qdev)->perf_stat.(__attr))
 354
 355 #define qperf_inc(__q, __attr)                                          \
 356 ({                                                                      \
 357         struct qdio_irq *qdev = (__q)->irq_ptr;                         \
 358         if (qdev->perf_stat_enabled)                                    \
 359                 (qdev->perf_stat.__attr)++;                             \
 360 })
 361
 362 static inline void account_sbals_error(struct qdio_q *q, int count)
 363 {
 364         q->q_stats.nr_sbal_error += count;
 365         q->q_stats.nr_sbal_total += count;
 366 }
 367
 368 /* the highest iqdio queue is used for multicast */
 369 static inline int multicast_outbound(struct qdio_q *q)
 370 {
 371         return (q->irq_ptr->nr_output_qs > 1) &&
 372                (q->nr == q->irq_ptr->nr_output_qs - 1);
 373 }
 374
 375 static inline unsigned long long get_usecs(void)
 376 {
 377         return monotonic_clock() >> 12;
 378 }
 379
 380 #define pci_out_supported(q) \
 381         (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 382 #define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 383
 384 #define need_siga_sync_thinint(q)       (!q->irq_ptr->siga_flag.no_sync_ti)
 385 #define need_siga_sync_out_thinint(q)   (!q->irq_ptr->siga_flag.no_sync_out_ti)
 386 #define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 387 #define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 388 #define need_siga_sync(q)               (q->irq_ptr->siga_flag.sync)
 389 #define siga_syncs_out_pci(q)           (q->irq_ptr->siga_flag.no_sync_out_pci)
 390
 391 #define for_each_input_queue(irq_ptr, q, i)     \
 392         for (i = 0, q = irq_ptr->input_qs[0];   \
 393                 i < irq_ptr->nr_input_qs;       \
 394                 q = irq_ptr->input_qs[++i])
 395 #define for_each_output_queue(irq_ptr, q, i)    \
 396         for (i = 0, q = irq_ptr->output_qs[0];  \
 397                 i < irq_ptr->nr_output_qs;      \
 398                 q = irq_ptr->output_qs[++i])
 399
 400 #define prev_buf(bufnr) \
 401         ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
 402 #define next_buf(bufnr) \
 403         ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
 404 #define add_buf(bufnr, inc) \
 405         ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
 406 #define sub_buf(bufnr, dec) \
 407         ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK)
 408
 409 /* prototypes for thin interrupt */
 410 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 411 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 412 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 413 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
 414 void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
 415 void tiqdio_inbound_processing(unsigned long q);
 416 int tiqdio_allocate_memory(void);
 417 void tiqdio_free_memory(void);
 418 int tiqdio_register_thinints(void);
 419 void tiqdio_unregister_thinints(void);
 420
 421 /* prototypes for setup */
 422 void qdio_inbound_processing(unsigned long data);
 423 void qdio_outbound_processing(unsigned long data);
 424 void qdio_outbound_timer(unsigned long data);
 425 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 426                       struct irb *irb);
 427 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 428                      int nr_output_qs);
 429 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 430 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 431                         struct subchannel_id *schid,
 432                         struct qdio_ssqd_desc *data);
 433 int qdio_setup_irq(struct qdio_initialize *init_data);
 434 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 435                                 struct ccw_device *cdev);
 436 void qdio_release_memory(struct qdio_irq *irq_ptr);
 437 int qdio_setup_create_sysfs(struct ccw_device *cdev);
 438 void qdio_setup_destroy_sysfs(struct ccw_device *cdev);
 439 int qdio_setup_init(void);
 440 void qdio_setup_exit(void);
 441
 442 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 443                         unsigned char *state);
 444 #endif /* _CIO_QDIO_H */