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
  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)
 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
 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) { 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_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
 196 struct 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
 213 struct 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
 269 struct 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 */
 314 static 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
 320 static 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 */
 353 void qdio_sync_after_thinint(struct qdio_q *q);
 354 int get_buf_state(struct qdio_q *q, unsigned int bufnr, unsigned char *state);
 355 void qdio_check_outbound_after_thinint(struct qdio_q *q);
 356 int qdio_inbound_q_moved(struct qdio_q *q);
 357 void qdio_kick_inbound_handler(struct qdio_q *q);
 358 void qdio_stop_polling(struct qdio_q *q);
 359 int qdio_siga_sync_q(struct qdio_q *q);
 360
 361 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
 362 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
 363 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
 364 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
 365 void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
 366 void tiqdio_inbound_processing(unsigned long q);
 367 int tiqdio_allocate_memory(void);
 368 void tiqdio_free_memory(void);
 369 int tiqdio_register_thinints(void);
 370 void tiqdio_unregister_thinints(void);
 371
 372 /* prototypes for setup */
 373 void qdio_inbound_processing(unsigned long data);
 374 void qdio_outbound_processing(unsigned long data);
 375 void qdio_outbound_timer(unsigned long data);
 376 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 377                       struct irb *irb);
 378 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
 379                      int nr_output_qs);
 380 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
 381 int qdio_setup_irq(struct qdio_initialize *init_data);
 382 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
 383                                 struct ccw_device *cdev);
 384 void qdio_release_memory(struct qdio_irq *irq_ptr);
 385 int qdio_setup_init(void);
 386 void qdio_setup_exit(void);
 387
 388 #endif /* _CIO_QDIO_H */