release/src-rt-6.x.4708/linux/linux-2.6.36/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 << 12)     /* 100 microseconds */
  17 #define QDIO_INPUT_THRESHOLD            (500 << 12)     /* 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 /* SIGA flags */
  95 #define QDIO_SIGA_WRITE         0x00
  96 #define QDIO_SIGA_READ          0x01
  97 #define QDIO_SIGA_SYNC          0x02
  98 #define QDIO_SIGA_QEBSM_FLAG    0x80
  99
 100 #ifdef CONFIG_64BIT
 101 static inline int do_sqbs(u64 token, unsigned char state, int queue,
 102                           int *start, int *count)
 103 {
 104         register unsigned long _ccq asm ("0") = *count;
 105         register unsigned long _token asm ("1") = token;
 106         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 107
 108         asm volatile(
 109                 "       .insn   rsy,0xeb000000008A,%1,0,0(%2)"
 110                 : "+d" (_ccq), "+d" (_queuestart)
 111                 : "d" ((unsigned long)state), "d" (_token)
 112                 : "memory", "cc");
 113         *count = _ccq & 0xff;
 114         *start = _queuestart & 0xff;
 115
 116         return (_ccq >> 32) & 0xff;
 117 }
 118
 119 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 120                           int *start, int *count, int ack)
 121 {
 122         register unsigned long _ccq asm ("0") = *count;
 123         register unsigned long _token asm ("1") = token;
 124         unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
 125         unsigned long _state = (unsigned long)ack << 63;
 126
 127         asm volatile(
 128                 "       .insn   rrf,0xB99c0000,%1,%2,0,0"
 129                 : "+d" (_ccq), "+d" (_queuestart), "+d" (_state)
 130                 : "d" (_token)
 131                 : "memory", "cc");
 132         *count = _ccq & 0xff;
 133         *start = _queuestart & 0xff;
 134         *state = _state & 0xff;
 135
 136         return (_ccq >> 32) & 0xff;
 137 }
 138 #else
 139 static inline int do_sqbs(u64 token, unsigned char state, int queue,
 140                           int *start, int *count) { return 0; }
 141 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 142                           int *start, int *count, int ack) { return 0; }
 143 #endif /* CONFIG_64BIT */
 144
 145 struct qdio_irq;
 146
 147 struct siga_flag {
 148         u8 input:1;
 149         u8 output:1;
 150         u8 sync:1;
 151         u8 no_sync_ti:1;
 152         u8 no_sync_out_ti:1;
 153         u8 no_sync_out_pci:1;
 154         u8:2;
 155 } __attribute__ ((packed));
 156
 157 struct chsc_ssqd_area {
 158         struct chsc_header request;
 159         u16:10;
 160         u8 ssid:2;
 161         u8 fmt:4;
 162         u16 first_sch;
 163         u16:16;
 164         u16 last_sch;
 165         u32:32;
 166         struct chsc_header response;
 167         u32:32;
 168         struct qdio_ssqd_desc qdio_ssqd;
 169 } __attribute__ ((packed));
 170
 171 struct scssc_area {
 172         struct chsc_header request;
 173         u16 operation_code;
 174         u16:16;
 175         u32:32;
 176         u32:32;
 177         u64 summary_indicator_addr;
 178         u64 subchannel_indicator_addr;
 179         u32 ks:4;
 180         u32 kc:4;
 181         u32:21;
 182         u32 isc:3;
 183         u32 word_with_d_bit;
 184         u32:32;
 185         struct subchannel_id schid;
 186         u32 reserved[1004];
 187         struct chsc_header response;
 188         u32:32;
 189 } __attribute__ ((packed));
 190
 191 struct qdio_dev_perf_stat {
 192         unsigned int adapter_int;
 193         unsigned int qdio_int;
 194         unsigned int pci_request_int;
 195
 196         unsigned int tasklet_inbound;
 197         unsigned int tasklet_inbound_resched;
 198         unsigned int tasklet_inbound_resched2;
 199         unsigned int tasklet_outbound;
 200
 201         unsigned int siga_read;
 202         unsigned int siga_write;
 203         unsigned int siga_sync;
 204
 205         unsigned int inbound_call;
 206         unsigned int inbound_handler;
 207         unsigned int stop_polling;
 208         unsigned int inbound_queue_full;
 209         unsigned int outbound_call;
 210         unsigned int outbound_handler;
 211         unsigned int fast_requeue;
 212         unsigned int target_full;
 213         unsigned int eqbs;
 214         unsigned int eqbs_partial;
 215         unsigned int sqbs;
 216         unsigned int sqbs_partial;
 217 } ____cacheline_aligned;
 218
 219 struct qdio_queue_perf_stat {
 220         /*
 221          * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128.
 222          * Since max. 127 SBALs are scanned reuse entry for 128 as queue full
 223          * aka 127 SBALs found.
 224          */
 225         unsigned int nr_sbals[8];
 226         unsigned int nr_sbal_error;
 227         unsigned int nr_sbal_nop;
 228         unsigned int nr_sbal_total;
 229 };
 230
 231 struct qdio_input_q {
 232         /* input buffer acknowledgement flag */
 233         int polling;
 234         /* first ACK'ed buffer */
 235         int ack_start;
 236         /* how much sbals are acknowledged with qebsm */
 237         int ack_count;
 238         /* last time of noticing incoming data */
 239         u64 timestamp;
 240 };
 241
 242 struct qdio_output_q {
 243         /* PCIs are enabled for the queue */
 244         int pci_out_enabled;
 245         /* IQDIO: output multiple buffers (enhanced SIGA) */
 246         int use_enh_siga;
 247         /* timer to check for more outbound work */
 248         struct timer_list timer;
 249 };
 250
 251 /*
 252  * Note on cache alignment: grouped slsb and write mostly data at the beginning
 253  * sbal[] is read-only and starts on a new cacheline followed by read mostly.
 254  */
 255 struct qdio_q {
 256         struct slsb slsb;
 257
 258         union {
 259                 struct qdio_input_q in;
 260                 struct qdio_output_q out;
 261         } u;
 262
 263         /*
 264          * inbound: next buffer the program should check for
 265          * outbound: next buffer to check if adapter processed it
 266          */
 267         int first_to_check;
 268
 269         /* first_to_check of the last time */
 270         int last_move;
 271
 272         /* beginning position for calling the program */
 273         int first_to_kick;
 274
 275         /* number of buffers in use by the adapter */
 276         atomic_t nr_buf_used;
 277
 278         /* error condition during a data transfer */
 279         unsigned int qdio_error;
 280
 281         struct tasklet_struct tasklet;
 282         struct qdio_queue_perf_stat q_stats;
 283
 284         struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
 285
 286         /* queue number */
 287         int nr;
 288
 289         /* bitmask of queue number */
 290         int mask;
 291
 292         /* input or output queue */
 293         int is_input_q;
 294
 295         /* list of thinint input queues */
 296         struct list_head entry;
 297
 298         /* upper-layer program handler */
 299         qdio_handler_t (*handler);
 300
 301         struct dentry *debugfs_q;
 302         struct qdio_irq *irq_ptr;
 303         struct sl *sl;
 304         /*
 305          * A page is allocated under this pointer and used for slib and sl.
 306          * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
 307          */
 308         struct slib *slib;
 309 } __attribute__ ((aligned(256)));
 310
 311 struct qdio_irq {
 312         struct qib qib;
 313         u32 *dsci;              /* address of device state change indicator */
 314         struct ccw_device *cdev;
 315         struct dentry *debugfs_dev;
 316         struct dentry *debugfs_perf;
 317
 318         unsigned long int_parm;
 319         struct subchannel_id schid;
 320         unsigned long sch_token;        /* QEBSM facility */
 321
 322         enum qdio_irq_states state;
 323
 324         struct siga_flag siga_flag;     /* siga sync information from qdioac */
 325
 326         int nr_input_qs;
 327         int nr_output_qs;
 328
 329         struct ccw1 ccw;
 330         struct ciw equeue;
 331         struct ciw aqueue;
 332
 333         struct qdio_ssqd_desc ssqd_desc;
 334         void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 335
 336         int perf_stat_enabled;
 337
 338         struct qdr *qdr;
 339         unsigned long chsc_page;
 340
 341         struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 342         struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 343
 344         debug_info_t *debug_area;
 345         struct mutex setup_mutex;
 346         struct qdio_dev_perf_stat perf_stat;
 347 };
 348
 349 /* helper functions */
 350 #define queue_type(q)   q->irq_ptr->qib.qfmt
 351 #define SCH_NO(q)       (q->irq_ptr->schid.sch_no)
 352
 353 #define is_thinint_irq(irq) \
 354         (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 355          css_general_characteristics.aif_osa)
 356
 357 #define qperf(__qdev, __attr)   ((__qdev)->perf_stat.(__attr))
 358
 359 #define qperf_inc(__q, __attr)                                          \
 360 ({                                                                      \
 361         struct qdio_irq *qdev = (__q)->irq_ptr;                         \
 362         if (qdev->perf_stat_enabled)                                    \
 363                 (qdev->perf_stat.__attr)++;                             \
 364 })
 365
 366 static inline void account_sbals_error(struct qdio_q *q, int count)
 367 {
 368         q->q_stats.nr_sbal_error += count;
 369         q->q_stats.nr_sbal_total += count;
 370 }
 371
 372 /* the highest iqdio queue is used for multicast */
 373 static inline int multicast_outbound(struct qdio_q *q)
 374 {
 375         return (q->irq_ptr->nr_output_qs > 1) &&
 376                (q->nr == q->irq_ptr->nr_output_qs - 1);
 377 }
 378
 379 #define pci_out_supported(q) \
 380         (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 381 #define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 382
 383 #define need_siga_sync_thinint(q)       (!q->irq_ptr->siga_flag.no_sync_ti)
 384 #define need_siga_sync_out_thinint(q)   (!q->irq_ptr->siga_flag.no_sync_out_ti)
 385 #define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 386 #define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 387 #define need_siga_sync(q)               (q->irq_ptr->siga_flag.sync)
 388 #define siga_syncs_out_pci(q)           (q->irq_ptr->siga_flag.no_sync_out_pci)
 389
 390 #define for_each_input_queue(irq_ptr, q, i)     \
 391         for (i = 0, q = irq_ptr->input_qs[0];   \
 392                 i < irq_ptr->nr_input_qs;       \
 393                 q = irq_ptr->input_qs[++i])
 394 #define for_each_output_queue(irq_ptr, q, i)    \
 395         for (i = 0, q = irq_ptr->output_qs[0];  \
 396                 i < irq_ptr->nr_output_qs;      \
 397                 q = irq_ptr->output_qs[++i])
 398
 399 #define prev_buf(bufnr) \
 400         ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
 401 #define next_buf(bufnr) \
 402         ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
 403 #define add_buf(bufnr, inc) \
 404         ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
 405 #define sub_buf(bufnr, dec) \
 406         ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK)
 407
 408 /* prototypes for thin interrupt */
 409 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 410 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 411 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 412 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
 413 void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
 414 void tiqdio_inbound_processing(unsigned long q);
 415 int tiqdio_allocate_memory(void);
 416 void tiqdio_free_memory(void);
 417 int tiqdio_register_thinints(void);
 418 void tiqdio_unregister_thinints(void);
 419
 420 /* prototypes for setup */
 421 void qdio_inbound_processing(unsigned long data);
 422 void qdio_outbound_processing(unsigned long data);
 423 void qdio_outbound_timer(unsigned long data);
 424 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 425                       struct irb *irb);
 426 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 427                      int nr_output_qs);
 428 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 429 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
 430                         struct subchannel_id *schid,
 431                         struct qdio_ssqd_desc *data);
 432 int qdio_setup_irq(struct qdio_initialize *init_data);
 433 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 434                                 struct ccw_device *cdev);
 435 void qdio_release_memory(struct qdio_irq *irq_ptr);
 436 int qdio_setup_create_sysfs(struct ccw_device *cdev);
 437 void qdio_setup_destroy_sysfs(struct ccw_device *cdev);
 438 int qdio_setup_init(void);
 439 void qdio_setup_exit(void);
 440
 441 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 442                         unsigned char *state);
 443 #endif /* _CIO_QDIO_H */