LXR linux/drivers/s390/cio/qdio.h

   1/*
   2 * linux/drivers/s390/cio/qdio.h
   3 *
   4 * Copyright 2000,2008 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 "chsc.h"
  14
  15#define QDIO_BUSY_BIT_PATIENCE          100     /* 100 microseconds */
  16#define QDIO_BUSY_BIT_GIVE_UP           2000000 /* 2 seconds = eternity */
  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
  27enum 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
  95static 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
 113static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 114                          int *start, int *count)
 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 = 0;
 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
 133static inline int do_sqbs(u64 token, unsigned char state, int queue,
 134                          int *start, int *count) { return 0; }
 135static inline int do_eqbs(u64 token, unsigned char *state, int queue,
 136                          int *start, int *count) { return 0; }
 137#endif /* CONFIG_64BIT */
 138
 139struct qdio_irq;
 140
 141struct 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
 151struct 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
 165struct 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
 185struct qdio_input_q {
 186        /* input buffer acknowledgement flag */
 187        int polling;
 188
 189        /* last time of noticing incoming data */
 190        u64 timestamp;
 191
 192        /* lock for clearing the acknowledgement */
 193        spinlock_t lock;
 194};
 195
 196struct qdio_output_q {
 197        /* failed siga-w attempts*/
 198        atomic_t busy_siga_counter;
 199
 200        /* start time of busy condition */
 201        u64 timestamp;
 202
 203        /* PCIs are enabled for the queue */
 204        int pci_out_enabled;
 205
 206        /* IQDIO: output multiple buffers (enhanced SIGA) */
 207        int use_enh_siga;
 208
 209        /* timer to check for more outbound work */
 210        struct timer_list timer;
 211};
 212
 213struct qdio_q {
 214        struct slsb slsb;
 215        union {
 216                struct qdio_input_q in;
 217                struct qdio_output_q out;
 218        } u;
 219
 220        /* queue number */
 221        int nr;
 222
 223        /* bitmask of queue number */
 224        int mask;
 225
 226        /* input or output queue */
 227        int is_input_q;
 228
 229        /* list of thinint input queues */
 230        struct list_head entry;
 231
 232        /* upper-layer program handler */
 233        qdio_handler_t (*handler);
 234
 235        /*
 236         * inbound: next buffer the program should check for
 237         * outbound: next buffer to check for having been processed
 238         * by the card
 239         */
 240        int first_to_check;
 241
 242        /* first_to_check of the last time */
 243        int last_move_ftc;
 244
 245        /* beginning position for calling the program */
 246        int first_to_kick;
 247
 248        /* number of buffers in use by the adapter */
 249        atomic_t nr_buf_used;
 250
 251        struct qdio_irq *irq_ptr;
 252        struct tasklet_struct tasklet;
 253
 254        /* error condition during a data transfer */
 255        unsigned int qdio_error;
 256
 257        struct sl *sl;
 258        struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
 259
 260        /*
 261         * Warning: Leave this member at the end so it won't be cleared in
 262         * qdio_fill_qs. A page is allocated under this pointer and used for
 263         * slib and sl. slib is 2048 bytes big and sl points to offset
 264         * PAGE_SIZE / 2.
 265         */
 266        struct slib *slib;
 267} __attribute__ ((aligned(256)));
 268
 269struct qdio_irq {
 270        struct qib qib;
 271        u32 *dsci;              /* address of device state change indicator */
 272        struct ccw_device *cdev;
 273
 274        unsigned long int_parm;
 275        struct subchannel_id schid;
 276        unsigned long sch_token;        /* QEBSM facility */
 277
 278        enum qdio_irq_states state;
 279
 280        struct siga_flag siga_flag;     /* siga sync information from qdioac */
 281
 282        int nr_input_qs;
 283        int nr_output_qs;
 284
 285        struct ccw1 ccw;
 286        struct ciw equeue;
 287        struct ciw aqueue;
 288
 289        struct qdio_ssqd_desc ssqd_desc;
 290
 291        void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
 292
 293        /*
 294         * Warning: Leave these members together at the end so they won't be
 295         * cleared in qdio_setup_irq.
 296         */
 297        struct qdr *qdr;
 298        unsigned long chsc_page;
 299
 300        struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
 301        struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
 302
 303        struct mutex setup_mutex;
 304};
 305
 306/* helper functions */
 307#define queue_type(q)   q->irq_ptr->qib.qfmt
 308
 309#define is_thinint_irq(irq) \
 310        (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
 311         css_general_characteristics.aif_osa)
 312
 313/* the highest iqdio queue is used for multicast */
 314static inline int multicast_outbound(struct qdio_q *q)
 315{
 316        return (q->irq_ptr->nr_output_qs > 1) &&
 317               (q->nr == q->irq_ptr->nr_output_qs - 1);
 318}
 319
 320static inline unsigned long long get_usecs(void)
 321{
 322        return monotonic_clock() >> 12;
 323}
 324
 325#define pci_out_supported(q) \
 326        (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
 327#define is_qebsm(q)                     (q->irq_ptr->sch_token != 0)
 328
 329#define need_siga_sync_thinint(q)       (!q->irq_ptr->siga_flag.no_sync_ti)
 330#define need_siga_sync_out_thinint(q)   (!q->irq_ptr->siga_flag.no_sync_out_ti)
 331#define need_siga_in(q)                 (q->irq_ptr->siga_flag.input)
 332#define need_siga_out(q)                (q->irq_ptr->siga_flag.output)
 333#define need_siga_sync(q)               (q->irq_ptr->siga_flag.sync)
 334#define siga_syncs_out_pci(q)           (q->irq_ptr->siga_flag.no_sync_out_pci)
 335
 336#define for_each_input_queue(irq_ptr, q, i)     \
 337        for (i = 0, q = irq_ptr->input_qs[0];   \
 338                i < irq_ptr->nr_input_qs;       \
 339                q = irq_ptr->input_qs[++i])
 340#define for_each_output_queue(irq_ptr, q, i)    \
 341        for (i = 0, q = irq_ptr->output_qs[0];  \
 342                i < irq_ptr->nr_output_qs;      \
 343                q = irq_ptr->output_qs[++i])
 344
 345#define prev_buf(bufnr) \
 346        ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
 347#define next_buf(bufnr) \
 348        ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
 349#define add_buf(bufnr, inc) \
 350        ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
 351
 352/* prototypes for thin interrupt */
 353void qdio_sync_after_thinint(struct qdio_q *q);
 354int get_buf_state(struct qdio_q *q, unsigned int bufnr, unsigned char *state);
 355void qdio_check_outbound_after_thinint(struct qdio_q *q);
 356int qdio_inbound_q_moved(struct qdio_q *q);
 357void qdio_kick_inbound_handler(struct qdio_q *q);
 358void qdio_stop_polling(struct qdio_q *q);
 359int qdio_siga_sync_q(struct qdio_q *q);
 360
 361void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 362int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 363void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 364void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
 365void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
 366void tiqdio_inbound_processing(unsigned long q);
 367int tiqdio_allocate_memory(void);
 368void tiqdio_free_memory(void);
 369int tiqdio_register_thinints(void);
 370void tiqdio_unregister_thinints(void);
 371
 372/* prototypes for setup */
 373void qdio_inbound_processing(unsigned long data);
 374void qdio_outbound_processing(unsigned long data);
 375void qdio_outbound_timer(unsigned long data);
 376void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 377                      struct irb *irb);
 378int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 379                     int nr_output_qs);
 380void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 381int qdio_setup_irq(struct qdio_initialize *init_data);
 382void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 383                                struct ccw_device *cdev);
 384void qdio_release_memory(struct qdio_irq *irq_ptr);
 385int qdio_setup_init(void);
 386void qdio_setup_exit(void);
 387
 388#endif /* _CIO_QDIO_H */
 389