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 19 enum 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 88 static 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] "a" ((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 } 105 106 static 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 } 126 127 struct qdio_irq; 128 129 struct qdio_dev_perf_stat { 130 unsigned int adapter_int; 131 unsigned int qdio_int; 132 133 unsigned int siga_read; 134 unsigned int siga_write; 135 unsigned int siga_sync; 136 137 unsigned int inbound_call; 138 unsigned int stop_polling; 139 unsigned int inbound_queue_full; 140 unsigned int outbound_call; 141 unsigned int outbound_queue_full; 142 unsigned int fast_requeue; 143 unsigned int target_full; 144 unsigned int eqbs; 145 unsigned int eqbs_partial; 146 unsigned int sqbs; 147 unsigned int sqbs_partial; 148 unsigned int int_discarded; 149 } ____cacheline_aligned; 150 151 struct qdio_queue_perf_stat { 152 /* Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128. */ 153 unsigned int nr_sbals[8]; 154 unsigned int nr_sbal_error; 155 unsigned int nr_sbal_nop; 156 unsigned int nr_sbal_total; 157 }; 158 159 enum qdio_irq_poll_states { 160 QDIO_IRQ_DISABLED, 161 }; 162 163 struct qdio_input_q { 164 /* Batch of SBALs that we processed while polling the queue: */ 165 unsigned int batch_start; 166 unsigned int batch_count; 167 }; 168 169 struct qdio_output_q { 170 }; 171 172 /* 173 * Note on cache alignment: grouped slsb and write mostly data at the beginning 174 * sbal[] is read-only and starts on a new cacheline followed by read mostly. 175 */ 176 struct qdio_q { 177 struct slsb slsb; 178 179 union { 180 struct qdio_input_q in; 181 struct qdio_output_q out; 182 } u; 183 184 /* 185 * inbound: next buffer the program should check for 186 * outbound: next buffer to check if adapter processed it 187 */ 188 int first_to_check; 189 190 /* number of buffers in use by the adapter */ 191 atomic_t nr_buf_used; 192 193 /* last scan of the queue */ 194 u64 timestamp; 195 196 struct qdio_queue_perf_stat q_stats; 197 198 struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned; 199 200 /* queue number */ 201 int nr; 202 203 /* bitmask of queue number */ 204 int mask; 205 206 /* input or output queue */ 207 int is_input_q; 208 209 /* upper-layer program handler */ 210 qdio_handler_t (*handler); 211 212 struct qdio_irq *irq_ptr; 213 214 /* memory page (PAGE_SIZE) used to place slib and sl on */ 215 void *sl_page; 216 struct sl *sl; 217 struct slib *slib; 218 } __attribute__ ((aligned(256))); 219 220 struct qdio_irq { 221 struct qib qib; 222 u32 *dsci; /* address of device state change indicator */ 223 struct ccw_device *cdev; 224 struct list_head entry; /* list of thinint devices */ 225 struct dentry *debugfs_dev; 226 u64 last_data_irq_time; 227 228 unsigned long int_parm; 229 struct subchannel_id schid; 230 unsigned long sch_token; /* QEBSM facility */ 231 232 enum qdio_irq_states state; 233 u8 qdioac1; 234 235 int nr_input_qs; 236 int nr_output_qs; 237 238 struct ccw1 *ccw; 239 240 struct qdio_ssqd_desc ssqd_desc; 241 void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *); 242 qdio_handler_t (*error_handler); 243 244 int perf_stat_enabled; 245 246 struct qdr *qdr; 247 unsigned long chsc_page; 248 249 struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ]; 250 struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ]; 251 unsigned int max_input_qs; 252 unsigned int max_output_qs; 253 254 void (*irq_poll)(struct ccw_device *cdev, unsigned long data); 255 unsigned long poll_state; 256 257 debug_info_t *debug_area; 258 struct mutex setup_mutex; 259 struct qdio_dev_perf_stat perf_stat; 260 }; 261 262 /* helper functions */ 263 #define queue_type(q) q->irq_ptr->qib.qfmt 264 #define SCH_NO(q) (q->irq_ptr->schid.sch_no) 265 266 #define is_thinint_irq(irq) \ 267 (irq->qib.qfmt == QDIO_IQDIO_QFMT || \ 268 css_general_characteristics.aif_qdio) 269 270 #define qperf(__qdev, __attr) ((__qdev)->perf_stat.(__attr)) 271 272 #define QDIO_PERF_STAT_INC(__irq, __attr) \ 273 ({ \ 274 struct qdio_irq *qdev = __irq; \ 275 if (qdev->perf_stat_enabled) \ 276 (qdev->perf_stat.__attr)++; \ 277 }) 278 279 #define qperf_inc(__q, __attr) QDIO_PERF_STAT_INC((__q)->irq_ptr, __attr) 280 281 static inline void account_sbals_error(struct qdio_q *q, int count) 282 { 283 q->q_stats.nr_sbal_error += count; 284 q->q_stats.nr_sbal_total += count; 285 } 286 287 /* the highest iqdio queue is used for multicast */ 288 static inline int multicast_outbound(struct qdio_q *q) 289 { 290 return (q->irq_ptr->nr_output_qs > 1) && 291 (q->nr == q->irq_ptr->nr_output_qs - 1); 292 } 293 294 static inline void qdio_deliver_irq(struct qdio_irq *irq) 295 { 296 if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq->poll_state)) 297 irq->irq_poll(irq->cdev, irq->int_parm); 298 else 299 QDIO_PERF_STAT_INC(irq, int_discarded); 300 } 301 302 #define pci_out_supported(irq) ((irq)->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) 303 #define is_qebsm(q) (q->irq_ptr->sch_token != 0) 304 305 #define qdio_need_siga_in(irq) ((irq)->qdioac1 & AC1_SIGA_INPUT_NEEDED) 306 #define qdio_need_siga_out(irq) ((irq)->qdioac1 & AC1_SIGA_OUTPUT_NEEDED) 307 #define qdio_need_siga_sync(irq) (unlikely((irq)->qdioac1 & AC1_SIGA_SYNC_NEEDED)) 308 309 #define for_each_input_queue(irq_ptr, q, i) \ 310 for (i = 0; i < irq_ptr->nr_input_qs && \ 311 ({ q = irq_ptr->input_qs[i]; 1; }); i++) 312 #define for_each_output_queue(irq_ptr, q, i) \ 313 for (i = 0; i < irq_ptr->nr_output_qs && \ 314 ({ q = irq_ptr->output_qs[i]; 1; }); i++) 315 316 #define add_buf(bufnr, inc) QDIO_BUFNR((bufnr) + (inc)) 317 #define next_buf(bufnr) add_buf(bufnr, 1) 318 #define sub_buf(bufnr, dec) QDIO_BUFNR((bufnr) - (dec)) 319 #define prev_buf(bufnr) sub_buf(bufnr, 1) 320 321 extern u64 last_ai_time; 322 323 /* prototypes for thin interrupt */ 324 int qdio_establish_thinint(struct qdio_irq *irq_ptr); 325 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr); 326 int qdio_thinint_init(void); 327 void qdio_thinint_exit(void); 328 int test_nonshared_ind(struct qdio_irq *); 329 330 /* prototypes for setup */ 331 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, 332 struct irb *irb); 333 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, 334 int nr_output_qs); 335 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr); 336 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr, 337 struct subchannel_id *schid, 338 struct qdio_ssqd_desc *data); 339 void qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data); 340 void qdio_shutdown_irq(struct qdio_irq *irq); 341 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr); 342 void qdio_free_queues(struct qdio_irq *irq_ptr); 343 int qdio_setup_init(void); 344 void qdio_setup_exit(void); 345 346 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, 347 unsigned char *state); 348 #endif /* _CIO_QDIO_H */ 349