Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/s390/cio/qdio_main.c |
| 3 | * |
| 4 | * Linux for s390 qdio support, buffer handling, qdio API and module support. |
| 5 | * |
| 6 | * Copyright 2000,2008 IBM Corp. |
| 7 | * Author(s): Utz Bacher <utz.bacher@de.ibm.com> |
| 8 | * Jan Glauber <jang@linux.vnet.ibm.com> |
| 9 | * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com> |
| 10 | */ |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/timer.h> |
| 15 | #include <linux/delay.h> |
| 16 | #include <asm/atomic.h> |
| 17 | #include <asm/debug.h> |
| 18 | #include <asm/qdio.h> |
| 19 | |
| 20 | #include "cio.h" |
| 21 | #include "css.h" |
| 22 | #include "device.h" |
| 23 | #include "qdio.h" |
| 24 | #include "qdio_debug.h" |
| 25 | #include "qdio_perf.h" |
| 26 | |
| 27 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ |
| 28 | "Jan Glauber <jang@linux.vnet.ibm.com>"); |
| 29 | MODULE_DESCRIPTION("QDIO base support"); |
| 30 | MODULE_LICENSE("GPL"); |
| 31 | |
| 32 | static inline int do_siga_sync(struct subchannel_id schid, |
| 33 | unsigned int out_mask, unsigned int in_mask) |
| 34 | { |
| 35 | register unsigned long __fc asm ("0") = 2; |
| 36 | register struct subchannel_id __schid asm ("1") = schid; |
| 37 | register unsigned long out asm ("2") = out_mask; |
| 38 | register unsigned long in asm ("3") = in_mask; |
| 39 | int cc; |
| 40 | |
| 41 | asm volatile( |
| 42 | " siga 0\n" |
| 43 | " ipm %0\n" |
| 44 | " srl %0,28\n" |
| 45 | : "=d" (cc) |
| 46 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); |
| 47 | return cc; |
| 48 | } |
| 49 | |
| 50 | static inline int do_siga_input(struct subchannel_id schid, unsigned int mask) |
| 51 | { |
| 52 | register unsigned long __fc asm ("0") = 1; |
| 53 | register struct subchannel_id __schid asm ("1") = schid; |
| 54 | register unsigned long __mask asm ("2") = mask; |
| 55 | int cc; |
| 56 | |
| 57 | asm volatile( |
| 58 | " siga 0\n" |
| 59 | " ipm %0\n" |
| 60 | " srl %0,28\n" |
| 61 | : "=d" (cc) |
| 62 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); |
| 63 | return cc; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * do_siga_output - perform SIGA-w/wt function |
| 68 | * @schid: subchannel id or in case of QEBSM the subchannel token |
| 69 | * @mask: which output queues to process |
| 70 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer |
| 71 | * @fc: function code to perform |
| 72 | * |
| 73 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. |
| 74 | * Note: For IQDC unicast queues only the highest priority queue is processed. |
| 75 | */ |
| 76 | static inline int do_siga_output(unsigned long schid, unsigned long mask, |
| 77 | u32 *bb, unsigned int fc) |
| 78 | { |
| 79 | register unsigned long __fc asm("0") = fc; |
| 80 | register unsigned long __schid asm("1") = schid; |
| 81 | register unsigned long __mask asm("2") = mask; |
| 82 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; |
| 83 | |
| 84 | asm volatile( |
| 85 | " siga 0\n" |
| 86 | "0: ipm %0\n" |
| 87 | " srl %0,28\n" |
| 88 | "1:\n" |
| 89 | EX_TABLE(0b, 1b) |
| 90 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) |
| 91 | : : "cc", "memory"); |
| 92 | *bb = ((unsigned int) __fc) >> 31; |
| 93 | return cc; |
| 94 | } |
| 95 | |
| 96 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) |
| 97 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 98 | /* all done or next buffer state different */ |
| 99 | if (ccq == 0 || ccq == 32) |
| 100 | return 0; |
| 101 | /* not all buffers processed */ |
| 102 | if (ccq == 96 || ccq == 97) |
| 103 | return 1; |
| 104 | /* notify devices immediately */ |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 105 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 106 | return -EIO; |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * qdio_do_eqbs - extract buffer states for QEBSM |
| 111 | * @q: queue to manipulate |
| 112 | * @state: state of the extracted buffers |
| 113 | * @start: buffer number to start at |
| 114 | * @count: count of buffers to examine |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 115 | * @auto_ack: automatically acknowledge buffers |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 116 | * |
| 117 | * Returns the number of successfull extracted equal buffer states. |
| 118 | * Stops processing if a state is different from the last buffers state. |
| 119 | */ |
| 120 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 121 | int start, int count, int auto_ack) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 122 | { |
| 123 | unsigned int ccq = 0; |
| 124 | int tmp_count = count, tmp_start = start; |
| 125 | int nr = q->nr; |
| 126 | int rc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 127 | |
| 128 | BUG_ON(!q->irq_ptr->sch_token); |
Jan Glauber | 23589d0 | 2008-12-25 13:38:44 +0100 | [diff] [blame] | 129 | qdio_perf_stat_inc(&perf_stats.debug_eqbs_all); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 130 | |
| 131 | if (!q->is_input_q) |
| 132 | nr += q->irq_ptr->nr_input_qs; |
| 133 | again: |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 134 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
| 135 | auto_ack); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 136 | rc = qdio_check_ccq(q, ccq); |
| 137 | |
| 138 | /* At least one buffer was processed, return and extract the remaining |
| 139 | * buffers later. |
| 140 | */ |
Jan Glauber | 23589d0 | 2008-12-25 13:38:44 +0100 | [diff] [blame] | 141 | if ((ccq == 96) && (count != tmp_count)) { |
| 142 | qdio_perf_stat_inc(&perf_stats.debug_eqbs_incomplete); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 143 | return (count - tmp_count); |
Jan Glauber | 23589d0 | 2008-12-25 13:38:44 +0100 | [diff] [blame] | 144 | } |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 145 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 146 | if (rc == 1) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 147 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 148 | goto again; |
| 149 | } |
| 150 | |
| 151 | if (rc < 0) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 152 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); |
| 153 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 154 | q->handler(q->irq_ptr->cdev, |
| 155 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, |
| 156 | 0, -1, -1, q->irq_ptr->int_parm); |
| 157 | return 0; |
| 158 | } |
| 159 | return count - tmp_count; |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * qdio_do_sqbs - set buffer states for QEBSM |
| 164 | * @q: queue to manipulate |
| 165 | * @state: new state of the buffers |
| 166 | * @start: first buffer number to change |
| 167 | * @count: how many buffers to change |
| 168 | * |
| 169 | * Returns the number of successfully changed buffers. |
| 170 | * Does retrying until the specified count of buffer states is set or an |
| 171 | * error occurs. |
| 172 | */ |
| 173 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, |
| 174 | int count) |
| 175 | { |
| 176 | unsigned int ccq = 0; |
| 177 | int tmp_count = count, tmp_start = start; |
| 178 | int nr = q->nr; |
| 179 | int rc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 180 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 181 | if (!count) |
| 182 | return 0; |
| 183 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 184 | BUG_ON(!q->irq_ptr->sch_token); |
Jan Glauber | 23589d0 | 2008-12-25 13:38:44 +0100 | [diff] [blame] | 185 | qdio_perf_stat_inc(&perf_stats.debug_sqbs_all); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 186 | |
| 187 | if (!q->is_input_q) |
| 188 | nr += q->irq_ptr->nr_input_qs; |
| 189 | again: |
| 190 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); |
| 191 | rc = qdio_check_ccq(q, ccq); |
| 192 | if (rc == 1) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 193 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
Jan Glauber | 23589d0 | 2008-12-25 13:38:44 +0100 | [diff] [blame] | 194 | qdio_perf_stat_inc(&perf_stats.debug_sqbs_incomplete); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 195 | goto again; |
| 196 | } |
| 197 | if (rc < 0) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 198 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); |
| 199 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 200 | q->handler(q->irq_ptr->cdev, |
| 201 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, |
| 202 | 0, -1, -1, q->irq_ptr->int_parm); |
| 203 | return 0; |
| 204 | } |
| 205 | WARN_ON(tmp_count); |
| 206 | return count - tmp_count; |
| 207 | } |
| 208 | |
| 209 | /* returns number of examined buffers and their common state in *state */ |
| 210 | static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr, |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 211 | unsigned char *state, unsigned int count, |
| 212 | int auto_ack) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 213 | { |
| 214 | unsigned char __state = 0; |
| 215 | int i; |
| 216 | |
| 217 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); |
| 218 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); |
| 219 | |
| 220 | if (is_qebsm(q)) |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 221 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 222 | |
| 223 | for (i = 0; i < count; i++) { |
| 224 | if (!__state) |
| 225 | __state = q->slsb.val[bufnr]; |
| 226 | else if (q->slsb.val[bufnr] != __state) |
| 227 | break; |
| 228 | bufnr = next_buf(bufnr); |
| 229 | } |
| 230 | *state = __state; |
| 231 | return i; |
| 232 | } |
| 233 | |
| 234 | inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 235 | unsigned char *state, int auto_ack) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 236 | { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 237 | return get_buf_states(q, bufnr, state, 1, auto_ack); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ |
| 241 | static inline int set_buf_states(struct qdio_q *q, int bufnr, |
| 242 | unsigned char state, int count) |
| 243 | { |
| 244 | int i; |
| 245 | |
| 246 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); |
| 247 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); |
| 248 | |
| 249 | if (is_qebsm(q)) |
| 250 | return qdio_do_sqbs(q, state, bufnr, count); |
| 251 | |
| 252 | for (i = 0; i < count; i++) { |
| 253 | xchg(&q->slsb.val[bufnr], state); |
| 254 | bufnr = next_buf(bufnr); |
| 255 | } |
| 256 | return count; |
| 257 | } |
| 258 | |
| 259 | static inline int set_buf_state(struct qdio_q *q, int bufnr, |
| 260 | unsigned char state) |
| 261 | { |
| 262 | return set_buf_states(q, bufnr, state, 1); |
| 263 | } |
| 264 | |
| 265 | /* set slsb states to initial state */ |
| 266 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) |
| 267 | { |
| 268 | struct qdio_q *q; |
| 269 | int i; |
| 270 | |
| 271 | for_each_input_queue(irq_ptr, q, i) |
| 272 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, |
| 273 | QDIO_MAX_BUFFERS_PER_Q); |
| 274 | for_each_output_queue(irq_ptr, q, i) |
| 275 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, |
| 276 | QDIO_MAX_BUFFERS_PER_Q); |
| 277 | } |
| 278 | |
| 279 | static int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
| 280 | unsigned int input) |
| 281 | { |
| 282 | int cc; |
| 283 | |
| 284 | if (!need_siga_sync(q)) |
| 285 | return 0; |
| 286 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 287 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:"); |
| 288 | DBF_DEV_HEX(DBF_INFO, q->irq_ptr, q, sizeof(void *)); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 289 | qdio_perf_stat_inc(&perf_stats.siga_sync); |
| 290 | |
| 291 | cc = do_siga_sync(q->irq_ptr->schid, output, input); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 292 | if (cc) |
| 293 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 294 | return cc; |
| 295 | } |
| 296 | |
| 297 | inline int qdio_siga_sync_q(struct qdio_q *q) |
| 298 | { |
| 299 | if (q->is_input_q) |
| 300 | return qdio_siga_sync(q, 0, q->mask); |
| 301 | else |
| 302 | return qdio_siga_sync(q, q->mask, 0); |
| 303 | } |
| 304 | |
| 305 | static inline int qdio_siga_sync_out(struct qdio_q *q) |
| 306 | { |
| 307 | return qdio_siga_sync(q, ~0U, 0); |
| 308 | } |
| 309 | |
| 310 | static inline int qdio_siga_sync_all(struct qdio_q *q) |
| 311 | { |
| 312 | return qdio_siga_sync(q, ~0U, ~0U); |
| 313 | } |
| 314 | |
| 315 | static inline int qdio_do_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
| 316 | { |
| 317 | unsigned int fc = 0; |
| 318 | unsigned long schid; |
| 319 | |
Klaus-Dieter Wacker | 7a0f475 | 2008-10-10 21:33:18 +0200 | [diff] [blame] | 320 | if (q->u.out.use_enh_siga) { |
| 321 | fc = 3; |
| 322 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 323 | if (!is_qebsm(q)) |
| 324 | schid = *((u32 *)&q->irq_ptr->schid); |
| 325 | else { |
| 326 | schid = q->irq_ptr->sch_token; |
| 327 | fc |= 0x80; |
| 328 | } |
| 329 | return do_siga_output(schid, q->mask, busy_bit, fc); |
| 330 | } |
| 331 | |
| 332 | static int qdio_siga_output(struct qdio_q *q) |
| 333 | { |
| 334 | int cc; |
| 335 | u32 busy_bit; |
| 336 | u64 start_time = 0; |
| 337 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 338 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 339 | qdio_perf_stat_inc(&perf_stats.siga_out); |
| 340 | again: |
| 341 | cc = qdio_do_siga_output(q, &busy_bit); |
| 342 | if (queue_type(q) == QDIO_IQDIO_QFMT && cc == 2 && busy_bit) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 343 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w bb:%2d", q->nr); |
Jan Glauber | 58eb27c | 2008-08-21 19:46:34 +0200 | [diff] [blame] | 344 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 345 | if (!start_time) |
| 346 | start_time = get_usecs(); |
| 347 | else if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE) |
| 348 | goto again; |
| 349 | } |
| 350 | |
| 351 | if (cc == 2 && busy_bit) |
| 352 | cc |= QDIO_ERROR_SIGA_BUSY; |
| 353 | if (cc) |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 354 | DBF_ERROR("%4x SIGA-W:%2d", SCH_NO(q), cc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 355 | return cc; |
| 356 | } |
| 357 | |
| 358 | static inline int qdio_siga_input(struct qdio_q *q) |
| 359 | { |
| 360 | int cc; |
| 361 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 362 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 363 | qdio_perf_stat_inc(&perf_stats.siga_in); |
| 364 | |
| 365 | cc = do_siga_input(q->irq_ptr->schid, q->mask); |
| 366 | if (cc) |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 367 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 368 | return cc; |
| 369 | } |
| 370 | |
| 371 | /* called from thinint inbound handler */ |
| 372 | void qdio_sync_after_thinint(struct qdio_q *q) |
| 373 | { |
| 374 | if (pci_out_supported(q)) { |
| 375 | if (need_siga_sync_thinint(q)) |
| 376 | qdio_siga_sync_all(q); |
| 377 | else if (need_siga_sync_out_thinint(q)) |
| 378 | qdio_siga_sync_out(q); |
| 379 | } else |
| 380 | qdio_siga_sync_q(q); |
| 381 | } |
| 382 | |
| 383 | inline void qdio_stop_polling(struct qdio_q *q) |
| 384 | { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 385 | if (!q->u.in.polling) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 386 | return; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 387 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 388 | q->u.in.polling = 0; |
| 389 | qdio_perf_stat_inc(&perf_stats.debug_stop_polling); |
| 390 | |
| 391 | /* show the card that we are not polling anymore */ |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 392 | if (is_qebsm(q)) { |
| 393 | set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT, |
| 394 | q->u.in.ack_count); |
| 395 | q->u.in.ack_count = 0; |
| 396 | } else |
| 397 | set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 398 | } |
| 399 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 400 | static void announce_buffer_error(struct qdio_q *q, int count) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 401 | { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 402 | q->qdio_error = QDIO_ERROR_SLSB_STATE; |
| 403 | |
| 404 | /* special handling for no target buffer empty */ |
| 405 | if ((!q->is_input_q && |
| 406 | (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) { |
| 407 | qdio_perf_stat_inc(&perf_stats.outbound_target_full); |
| 408 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d", |
| 409 | q->first_to_check); |
| 410 | return; |
| 411 | } |
| 412 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 413 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
| 414 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 415 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 416 | DBF_ERROR("F14:%2x F15:%2x", |
| 417 | q->sbal[q->first_to_check]->element[14].flags & 0xff, |
| 418 | q->sbal[q->first_to_check]->element[15].flags & 0xff); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 419 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 420 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 421 | static inline void inbound_primed(struct qdio_q *q, int count) |
| 422 | { |
| 423 | int new; |
| 424 | |
| 425 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count); |
| 426 | |
| 427 | /* for QEBSM the ACK was already set by EQBS */ |
| 428 | if (is_qebsm(q)) { |
| 429 | if (!q->u.in.polling) { |
| 430 | q->u.in.polling = 1; |
| 431 | q->u.in.ack_count = count; |
| 432 | q->last_move_ftc = q->first_to_check; |
| 433 | return; |
| 434 | } |
| 435 | |
| 436 | /* delete the previous ACK's */ |
| 437 | set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT, |
| 438 | q->u.in.ack_count); |
| 439 | q->u.in.ack_count = count; |
| 440 | q->last_move_ftc = q->first_to_check; |
| 441 | return; |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling |
| 446 | * or by the next inbound run. |
| 447 | */ |
| 448 | new = add_buf(q->first_to_check, count - 1); |
| 449 | if (q->u.in.polling) { |
| 450 | /* reset the previous ACK but first set the new one */ |
| 451 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
| 452 | set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT); |
| 453 | } |
| 454 | else { |
| 455 | q->u.in.polling = 1; |
| 456 | set_buf_state(q, q->first_to_check, SLSB_P_INPUT_ACK); |
| 457 | } |
| 458 | |
| 459 | q->last_move_ftc = new; |
| 460 | count--; |
| 461 | if (!count) |
| 462 | return; |
| 463 | |
| 464 | /* |
| 465 | * Need to change all PRIMED buffers to NOT_INIT, otherwise |
| 466 | * we're loosing initiative in the thinint code. |
| 467 | */ |
| 468 | set_buf_states(q, next_buf(q->first_to_check), SLSB_P_INPUT_NOT_INIT, |
| 469 | count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | static int get_inbound_buffer_frontier(struct qdio_q *q) |
| 473 | { |
| 474 | int count, stop; |
| 475 | unsigned char state; |
| 476 | |
| 477 | /* |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 478 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved |
| 479 | * would return 0. |
| 480 | */ |
| 481 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); |
| 482 | stop = add_buf(q->first_to_check, count); |
| 483 | |
| 484 | /* |
| 485 | * No siga sync here, as a PCI or we after a thin interrupt |
| 486 | * will sync the queues. |
| 487 | */ |
| 488 | |
| 489 | /* need to set count to 1 for non-qebsm */ |
| 490 | if (!is_qebsm(q)) |
| 491 | count = 1; |
| 492 | |
| 493 | check_next: |
| 494 | if (q->first_to_check == stop) |
| 495 | goto out; |
| 496 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 497 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 498 | if (!count) |
| 499 | goto out; |
| 500 | |
| 501 | switch (state) { |
| 502 | case SLSB_P_INPUT_PRIMED: |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 503 | inbound_primed(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 504 | /* |
| 505 | * No siga-sync needed for non-qebsm here, as the inbound queue |
| 506 | * will be synced on the next siga-r, resp. |
| 507 | * tiqdio_is_inbound_q_done will do the siga-sync. |
| 508 | */ |
| 509 | q->first_to_check = add_buf(q->first_to_check, count); |
| 510 | atomic_sub(count, &q->nr_buf_used); |
| 511 | goto check_next; |
| 512 | case SLSB_P_INPUT_ERROR: |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 513 | announce_buffer_error(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 514 | /* process the buffer, the upper layer will take care of it */ |
| 515 | q->first_to_check = add_buf(q->first_to_check, count); |
| 516 | atomic_sub(count, &q->nr_buf_used); |
| 517 | break; |
| 518 | case SLSB_CU_INPUT_EMPTY: |
| 519 | case SLSB_P_INPUT_NOT_INIT: |
| 520 | case SLSB_P_INPUT_ACK: |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 521 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 522 | break; |
| 523 | default: |
| 524 | BUG(); |
| 525 | } |
| 526 | out: |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 527 | return q->first_to_check; |
| 528 | } |
| 529 | |
| 530 | int qdio_inbound_q_moved(struct qdio_q *q) |
| 531 | { |
| 532 | int bufnr; |
| 533 | |
| 534 | bufnr = get_inbound_buffer_frontier(q); |
| 535 | |
| 536 | if ((bufnr != q->last_move_ftc) || q->qdio_error) { |
| 537 | if (!need_siga_sync(q) && !pci_out_supported(q)) |
| 538 | q->u.in.timestamp = get_usecs(); |
| 539 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 540 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in moved"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 541 | return 1; |
| 542 | } else |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | static int qdio_inbound_q_done(struct qdio_q *q) |
| 547 | { |
Jan Glauber | 9a1ce28 | 2008-12-25 13:38:45 +0100 | [diff] [blame] | 548 | unsigned char state = 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 549 | |
| 550 | if (!atomic_read(&q->nr_buf_used)) |
| 551 | return 1; |
| 552 | |
| 553 | /* |
| 554 | * We need that one for synchronization with the adapter, as it |
| 555 | * does a kind of PCI avoidance. |
| 556 | */ |
| 557 | qdio_siga_sync_q(q); |
| 558 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 559 | get_buf_state(q, q->first_to_check, &state, 0); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 560 | if (state == SLSB_P_INPUT_PRIMED) |
| 561 | /* we got something to do */ |
| 562 | return 0; |
| 563 | |
| 564 | /* on VM, we don't poll, so the q is always done here */ |
| 565 | if (need_siga_sync(q) || pci_out_supported(q)) |
| 566 | return 1; |
| 567 | |
| 568 | /* |
| 569 | * At this point we know, that inbound first_to_check |
| 570 | * has (probably) not moved (see qdio_inbound_processing). |
| 571 | */ |
| 572 | if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 573 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d", |
| 574 | q->first_to_check); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 575 | return 1; |
| 576 | } else { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 577 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in notd:%3d", |
| 578 | q->first_to_check); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 579 | return 0; |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | void qdio_kick_inbound_handler(struct qdio_q *q) |
| 584 | { |
| 585 | int count, start, end; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 586 | |
| 587 | qdio_perf_stat_inc(&perf_stats.inbound_handler); |
| 588 | |
| 589 | start = q->first_to_kick; |
| 590 | end = q->first_to_check; |
| 591 | if (end >= start) |
| 592 | count = end - start; |
| 593 | else |
| 594 | count = end + QDIO_MAX_BUFFERS_PER_Q - start; |
| 595 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 596 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 597 | |
| 598 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) |
| 599 | return; |
| 600 | |
| 601 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, |
| 602 | start, count, q->irq_ptr->int_parm); |
| 603 | |
| 604 | /* for the next time */ |
| 605 | q->first_to_kick = q->first_to_check; |
| 606 | q->qdio_error = 0; |
| 607 | } |
| 608 | |
| 609 | static void __qdio_inbound_processing(struct qdio_q *q) |
| 610 | { |
| 611 | qdio_perf_stat_inc(&perf_stats.tasklet_inbound); |
| 612 | again: |
| 613 | if (!qdio_inbound_q_moved(q)) |
| 614 | return; |
| 615 | |
| 616 | qdio_kick_inbound_handler(q); |
| 617 | |
| 618 | if (!qdio_inbound_q_done(q)) |
| 619 | /* means poll time is not yet over */ |
| 620 | goto again; |
| 621 | |
| 622 | qdio_stop_polling(q); |
| 623 | /* |
| 624 | * We need to check again to not lose initiative after |
| 625 | * resetting the ACK state. |
| 626 | */ |
| 627 | if (!qdio_inbound_q_done(q)) |
| 628 | goto again; |
| 629 | } |
| 630 | |
| 631 | /* inbound tasklet */ |
| 632 | void qdio_inbound_processing(unsigned long data) |
| 633 | { |
| 634 | struct qdio_q *q = (struct qdio_q *)data; |
| 635 | __qdio_inbound_processing(q); |
| 636 | } |
| 637 | |
| 638 | static int get_outbound_buffer_frontier(struct qdio_q *q) |
| 639 | { |
| 640 | int count, stop; |
| 641 | unsigned char state; |
| 642 | |
| 643 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) || |
| 644 | (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q))) |
| 645 | qdio_siga_sync_q(q); |
| 646 | |
| 647 | /* |
| 648 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved |
| 649 | * would return 0. |
| 650 | */ |
| 651 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); |
| 652 | stop = add_buf(q->first_to_check, count); |
| 653 | |
| 654 | /* need to set count to 1 for non-qebsm */ |
| 655 | if (!is_qebsm(q)) |
| 656 | count = 1; |
| 657 | |
| 658 | check_next: |
| 659 | if (q->first_to_check == stop) |
| 660 | return q->first_to_check; |
| 661 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 662 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 663 | if (!count) |
| 664 | return q->first_to_check; |
| 665 | |
| 666 | switch (state) { |
| 667 | case SLSB_P_OUTPUT_EMPTY: |
| 668 | /* the adapter got it */ |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 669 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 670 | |
| 671 | atomic_sub(count, &q->nr_buf_used); |
| 672 | q->first_to_check = add_buf(q->first_to_check, count); |
| 673 | /* |
| 674 | * We fetch all buffer states at once. get_buf_states may |
| 675 | * return count < stop. For QEBSM we do not loop. |
| 676 | */ |
| 677 | if (is_qebsm(q)) |
| 678 | break; |
| 679 | goto check_next; |
| 680 | case SLSB_P_OUTPUT_ERROR: |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 681 | announce_buffer_error(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 682 | /* process the buffer, the upper layer will take care of it */ |
| 683 | q->first_to_check = add_buf(q->first_to_check, count); |
| 684 | atomic_sub(count, &q->nr_buf_used); |
| 685 | break; |
| 686 | case SLSB_CU_OUTPUT_PRIMED: |
| 687 | /* the adapter has not fetched the output yet */ |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 688 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 689 | break; |
| 690 | case SLSB_P_OUTPUT_NOT_INIT: |
| 691 | case SLSB_P_OUTPUT_HALTED: |
| 692 | break; |
| 693 | default: |
| 694 | BUG(); |
| 695 | } |
| 696 | return q->first_to_check; |
| 697 | } |
| 698 | |
| 699 | /* all buffers processed? */ |
| 700 | static inline int qdio_outbound_q_done(struct qdio_q *q) |
| 701 | { |
| 702 | return atomic_read(&q->nr_buf_used) == 0; |
| 703 | } |
| 704 | |
| 705 | static inline int qdio_outbound_q_moved(struct qdio_q *q) |
| 706 | { |
| 707 | int bufnr; |
| 708 | |
| 709 | bufnr = get_outbound_buffer_frontier(q); |
| 710 | |
| 711 | if ((bufnr != q->last_move_ftc) || q->qdio_error) { |
| 712 | q->last_move_ftc = bufnr; |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 713 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 714 | return 1; |
| 715 | } else |
| 716 | return 0; |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * VM could present us cc=2 and busy bit set on SIGA-write |
| 721 | * during reconfiguration of their Guest LAN (only in iqdio mode, |
| 722 | * otherwise qdio is asynchronous and cc=2 and busy bit there will take |
| 723 | * the queues down immediately). |
| 724 | * |
| 725 | * Therefore qdio_siga_output will try for a short time constantly, |
| 726 | * if such a condition occurs. If it doesn't change, it will |
| 727 | * increase the busy_siga_counter and save the timestamp, and |
| 728 | * schedule the queue for later processing. qdio_outbound_processing |
| 729 | * will check out the counter. If non-zero, it will call qdio_kick_outbound_q |
| 730 | * as often as the value of the counter. This will attempt further SIGA |
| 731 | * instructions. For each successful SIGA, the counter is |
| 732 | * decreased, for failing SIGAs the counter remains the same, after |
| 733 | * all. After some time of no movement, qdio_kick_outbound_q will |
| 734 | * finally fail and reflect corresponding error codes to call |
| 735 | * the upper layer module and have it take the queues down. |
| 736 | * |
| 737 | * Note that this is a change from the original HiperSockets design |
| 738 | * (saying cc=2 and busy bit means take the queues down), but in |
| 739 | * these days Guest LAN didn't exist... excessive cc=2 with busy bit |
| 740 | * conditions will still take the queues down, but the threshold is |
| 741 | * higher due to the Guest LAN environment. |
| 742 | * |
| 743 | * Called from outbound tasklet and do_QDIO handler. |
| 744 | */ |
| 745 | static void qdio_kick_outbound_q(struct qdio_q *q) |
| 746 | { |
| 747 | int rc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 748 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 749 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kickoutq:%1d", q->nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 750 | |
| 751 | if (!need_siga_out(q)) |
| 752 | return; |
| 753 | |
| 754 | rc = qdio_siga_output(q); |
| 755 | switch (rc) { |
| 756 | case 0: |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 757 | /* TODO: improve error handling for CC=0 case */ |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 758 | if (q->u.out.timestamp) |
| 759 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "cc2 rslv:%4x", |
| 760 | atomic_read(&q->u.out.busy_siga_counter)); |
Jan Glauber | 58eb27c | 2008-08-21 19:46:34 +0200 | [diff] [blame] | 761 | /* went smooth this time, reset timestamp */ |
| 762 | q->u.out.timestamp = 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 763 | break; |
| 764 | /* cc=2 and busy bit */ |
| 765 | case (2 | QDIO_ERROR_SIGA_BUSY): |
| 766 | atomic_inc(&q->u.out.busy_siga_counter); |
| 767 | |
| 768 | /* if the last siga was successful, save timestamp here */ |
| 769 | if (!q->u.out.timestamp) |
| 770 | q->u.out.timestamp = get_usecs(); |
| 771 | |
| 772 | /* if we're in time, don't touch qdio_error */ |
| 773 | if (get_usecs() - q->u.out.timestamp < QDIO_BUSY_BIT_GIVE_UP) { |
| 774 | tasklet_schedule(&q->tasklet); |
| 775 | break; |
| 776 | } |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 777 | DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 778 | default: |
| 779 | /* for plain cc=1, 2 or 3 */ |
| 780 | q->qdio_error = rc; |
| 781 | } |
| 782 | } |
| 783 | |
| 784 | static void qdio_kick_outbound_handler(struct qdio_q *q) |
| 785 | { |
| 786 | int start, end, count; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 787 | |
| 788 | start = q->first_to_kick; |
| 789 | end = q->last_move_ftc; |
| 790 | if (end >= start) |
| 791 | count = end - start; |
| 792 | else |
| 793 | count = end + QDIO_MAX_BUFFERS_PER_Q - start; |
| 794 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 795 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kickouth: %1d", q->nr); |
| 796 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 797 | |
| 798 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) |
| 799 | return; |
| 800 | |
| 801 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, |
| 802 | q->irq_ptr->int_parm); |
| 803 | |
| 804 | /* for the next time: */ |
| 805 | q->first_to_kick = q->last_move_ftc; |
| 806 | q->qdio_error = 0; |
| 807 | } |
| 808 | |
| 809 | static void __qdio_outbound_processing(struct qdio_q *q) |
| 810 | { |
| 811 | int siga_attempts; |
| 812 | |
| 813 | qdio_perf_stat_inc(&perf_stats.tasklet_outbound); |
| 814 | |
| 815 | /* see comment in qdio_kick_outbound_q */ |
| 816 | siga_attempts = atomic_read(&q->u.out.busy_siga_counter); |
| 817 | while (siga_attempts--) { |
| 818 | atomic_dec(&q->u.out.busy_siga_counter); |
| 819 | qdio_kick_outbound_q(q); |
| 820 | } |
| 821 | |
| 822 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
| 823 | |
| 824 | if (qdio_outbound_q_moved(q)) |
| 825 | qdio_kick_outbound_handler(q); |
| 826 | |
| 827 | if (queue_type(q) == QDIO_ZFCP_QFMT) { |
| 828 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
| 829 | tasklet_schedule(&q->tasklet); |
| 830 | return; |
| 831 | } |
| 832 | |
| 833 | /* bail out for HiperSockets unicast queues */ |
| 834 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) |
| 835 | return; |
| 836 | |
Ursula Braun | 4bcb3a3 | 2008-10-10 21:33:04 +0200 | [diff] [blame] | 837 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
| 838 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) { |
| 839 | tasklet_schedule(&q->tasklet); |
| 840 | return; |
| 841 | } |
| 842 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 843 | if (q->u.out.pci_out_enabled) |
| 844 | return; |
| 845 | |
| 846 | /* |
| 847 | * Now we know that queue type is either qeth without pci enabled |
| 848 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to |
| 849 | * EMPTY is noticed and outbound_handler is called after some time. |
| 850 | */ |
| 851 | if (qdio_outbound_q_done(q)) |
| 852 | del_timer(&q->u.out.timer); |
| 853 | else { |
| 854 | if (!timer_pending(&q->u.out.timer)) { |
| 855 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
| 856 | qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer); |
| 857 | } |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | /* outbound tasklet */ |
| 862 | void qdio_outbound_processing(unsigned long data) |
| 863 | { |
| 864 | struct qdio_q *q = (struct qdio_q *)data; |
| 865 | __qdio_outbound_processing(q); |
| 866 | } |
| 867 | |
| 868 | void qdio_outbound_timer(unsigned long data) |
| 869 | { |
| 870 | struct qdio_q *q = (struct qdio_q *)data; |
| 871 | tasklet_schedule(&q->tasklet); |
| 872 | } |
| 873 | |
| 874 | /* called from thinint inbound tasklet */ |
| 875 | void qdio_check_outbound_after_thinint(struct qdio_q *q) |
| 876 | { |
| 877 | struct qdio_q *out; |
| 878 | int i; |
| 879 | |
| 880 | if (!pci_out_supported(q)) |
| 881 | return; |
| 882 | |
| 883 | for_each_output_queue(q->irq_ptr, out, i) |
| 884 | if (!qdio_outbound_q_done(out)) |
| 885 | tasklet_schedule(&out->tasklet); |
| 886 | } |
| 887 | |
| 888 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
| 889 | enum qdio_irq_states state) |
| 890 | { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 891 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 892 | |
| 893 | irq_ptr->state = state; |
| 894 | mb(); |
| 895 | } |
| 896 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 897 | static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 898 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 899 | if (irb->esw.esw0.erw.cons) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 900 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
| 901 | DBF_ERROR_HEX(irb, 64); |
| 902 | DBF_ERROR_HEX(irb->ecw, 64); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 903 | } |
| 904 | } |
| 905 | |
| 906 | /* PCI interrupt handler */ |
| 907 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) |
| 908 | { |
| 909 | int i; |
| 910 | struct qdio_q *q; |
| 911 | |
| 912 | qdio_perf_stat_inc(&perf_stats.pci_int); |
| 913 | |
| 914 | for_each_input_queue(irq_ptr, q, i) |
| 915 | tasklet_schedule(&q->tasklet); |
| 916 | |
| 917 | if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)) |
| 918 | return; |
| 919 | |
| 920 | for_each_output_queue(irq_ptr, q, i) { |
| 921 | if (qdio_outbound_q_done(q)) |
| 922 | continue; |
| 923 | |
| 924 | if (!siga_syncs_out_pci(q)) |
| 925 | qdio_siga_sync_q(q); |
| 926 | |
| 927 | tasklet_schedule(&q->tasklet); |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | static void qdio_handle_activate_check(struct ccw_device *cdev, |
| 932 | unsigned long intparm, int cstat, int dstat) |
| 933 | { |
| 934 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 935 | struct qdio_q *q; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 936 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 937 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
| 938 | DBF_ERROR("intp :%lx", intparm); |
| 939 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 940 | |
| 941 | if (irq_ptr->nr_input_qs) { |
| 942 | q = irq_ptr->input_qs[0]; |
| 943 | } else if (irq_ptr->nr_output_qs) { |
| 944 | q = irq_ptr->output_qs[0]; |
| 945 | } else { |
| 946 | dump_stack(); |
| 947 | goto no_handler; |
| 948 | } |
| 949 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, |
| 950 | 0, -1, -1, irq_ptr->int_parm); |
| 951 | no_handler: |
| 952 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); |
| 953 | } |
| 954 | |
| 955 | static void qdio_call_shutdown(struct work_struct *work) |
| 956 | { |
| 957 | struct ccw_device_private *priv; |
| 958 | struct ccw_device *cdev; |
| 959 | |
| 960 | priv = container_of(work, struct ccw_device_private, kick_work); |
| 961 | cdev = priv->cdev; |
| 962 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 963 | put_device(&cdev->dev); |
| 964 | } |
| 965 | |
| 966 | static void qdio_int_error(struct ccw_device *cdev) |
| 967 | { |
| 968 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 969 | |
| 970 | switch (irq_ptr->state) { |
| 971 | case QDIO_IRQ_STATE_INACTIVE: |
| 972 | case QDIO_IRQ_STATE_CLEANUP: |
| 973 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
| 974 | break; |
| 975 | case QDIO_IRQ_STATE_ESTABLISHED: |
| 976 | case QDIO_IRQ_STATE_ACTIVE: |
| 977 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); |
| 978 | if (get_device(&cdev->dev)) { |
| 979 | /* Can't call shutdown from interrupt context. */ |
| 980 | PREPARE_WORK(&cdev->private->kick_work, |
| 981 | qdio_call_shutdown); |
| 982 | queue_work(ccw_device_work, &cdev->private->kick_work); |
| 983 | } |
| 984 | break; |
| 985 | default: |
| 986 | WARN_ON(1); |
| 987 | } |
| 988 | wake_up(&cdev->private->wait_q); |
| 989 | } |
| 990 | |
| 991 | static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat, |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 992 | int dstat) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 993 | { |
| 994 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 995 | |
| 996 | if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 997 | DBF_ERROR("EQ:ck con"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 998 | goto error; |
| 999 | } |
| 1000 | |
| 1001 | if (!(dstat & DEV_STAT_DEV_END)) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1002 | DBF_ERROR("EQ:no dev"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1003 | goto error; |
| 1004 | } |
| 1005 | |
| 1006 | if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1007 | DBF_ERROR("EQ: bad io"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1008 | goto error; |
| 1009 | } |
| 1010 | return 0; |
| 1011 | error: |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1012 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
| 1013 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); |
| 1014 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1015 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
| 1016 | return 1; |
| 1017 | } |
| 1018 | |
| 1019 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
| 1020 | int dstat) |
| 1021 | { |
| 1022 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1023 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1024 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1025 | if (!qdio_establish_check_errors(cdev, cstat, dstat)) |
| 1026 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); |
| 1027 | } |
| 1028 | |
| 1029 | /* qdio interrupt handler */ |
| 1030 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, |
| 1031 | struct irb *irb) |
| 1032 | { |
| 1033 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 1034 | int cstat, dstat; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1035 | |
| 1036 | qdio_perf_stat_inc(&perf_stats.qdio_int); |
| 1037 | |
| 1038 | if (!intparm || !irq_ptr) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1039 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1040 | return; |
| 1041 | } |
| 1042 | |
| 1043 | if (IS_ERR(irb)) { |
| 1044 | switch (PTR_ERR(irb)) { |
| 1045 | case -EIO: |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1046 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1047 | return; |
| 1048 | case -ETIMEDOUT: |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1049 | DBF_ERROR("%4x IO timeout", irq_ptr->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1050 | qdio_int_error(cdev); |
| 1051 | return; |
| 1052 | default: |
| 1053 | WARN_ON(1); |
| 1054 | return; |
| 1055 | } |
| 1056 | } |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1057 | qdio_irq_check_sense(irq_ptr, irb); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1058 | |
| 1059 | cstat = irb->scsw.cmd.cstat; |
| 1060 | dstat = irb->scsw.cmd.dstat; |
| 1061 | |
| 1062 | switch (irq_ptr->state) { |
| 1063 | case QDIO_IRQ_STATE_INACTIVE: |
| 1064 | qdio_establish_handle_irq(cdev, cstat, dstat); |
| 1065 | break; |
| 1066 | |
| 1067 | case QDIO_IRQ_STATE_CLEANUP: |
| 1068 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); |
| 1069 | break; |
| 1070 | |
| 1071 | case QDIO_IRQ_STATE_ESTABLISHED: |
| 1072 | case QDIO_IRQ_STATE_ACTIVE: |
| 1073 | if (cstat & SCHN_STAT_PCI) { |
| 1074 | qdio_int_handler_pci(irq_ptr); |
| 1075 | /* no state change so no need to wake up wait_q */ |
| 1076 | return; |
| 1077 | } |
| 1078 | if ((cstat & ~SCHN_STAT_PCI) || dstat) { |
| 1079 | qdio_handle_activate_check(cdev, intparm, cstat, |
| 1080 | dstat); |
| 1081 | break; |
| 1082 | } |
| 1083 | default: |
| 1084 | WARN_ON(1); |
| 1085 | } |
| 1086 | wake_up(&cdev->private->wait_q); |
| 1087 | } |
| 1088 | |
| 1089 | /** |
| 1090 | * qdio_get_ssqd_desc - get qdio subchannel description |
| 1091 | * @cdev: ccw device to get description for |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1092 | * @data: where to store the ssqd |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1093 | * |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1094 | * Returns 0 or an error code. The results of the chsc are stored in the |
| 1095 | * specified structure. |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1096 | */ |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1097 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
| 1098 | struct qdio_ssqd_desc *data) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1099 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1100 | |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1101 | if (!cdev || !cdev->private) |
| 1102 | return -EINVAL; |
| 1103 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1104 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1105 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1106 | } |
| 1107 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); |
| 1108 | |
| 1109 | /** |
| 1110 | * qdio_cleanup - shutdown queues and free data structures |
| 1111 | * @cdev: associated ccw device |
| 1112 | * @how: use halt or clear to shutdown |
| 1113 | * |
| 1114 | * This function calls qdio_shutdown() for @cdev with method @how |
| 1115 | * and on success qdio_free() for @cdev. |
| 1116 | */ |
| 1117 | int qdio_cleanup(struct ccw_device *cdev, int how) |
| 1118 | { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1119 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1120 | int rc; |
| 1121 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1122 | if (!irq_ptr) |
| 1123 | return -ENODEV; |
| 1124 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1125 | rc = qdio_shutdown(cdev, how); |
| 1126 | if (rc == 0) |
| 1127 | rc = qdio_free(cdev); |
| 1128 | return rc; |
| 1129 | } |
| 1130 | EXPORT_SYMBOL_GPL(qdio_cleanup); |
| 1131 | |
| 1132 | static void qdio_shutdown_queues(struct ccw_device *cdev) |
| 1133 | { |
| 1134 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 1135 | struct qdio_q *q; |
| 1136 | int i; |
| 1137 | |
| 1138 | for_each_input_queue(irq_ptr, q, i) |
| 1139 | tasklet_disable(&q->tasklet); |
| 1140 | |
| 1141 | for_each_output_queue(irq_ptr, q, i) { |
| 1142 | tasklet_disable(&q->tasklet); |
| 1143 | del_timer(&q->u.out.timer); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | /** |
| 1148 | * qdio_shutdown - shut down a qdio subchannel |
| 1149 | * @cdev: associated ccw device |
| 1150 | * @how: use halt or clear to shutdown |
| 1151 | */ |
| 1152 | int qdio_shutdown(struct ccw_device *cdev, int how) |
| 1153 | { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1154 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1155 | int rc; |
| 1156 | unsigned long flags; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1157 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1158 | if (!irq_ptr) |
| 1159 | return -ENODEV; |
| 1160 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1161 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
| 1162 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1163 | mutex_lock(&irq_ptr->setup_mutex); |
| 1164 | /* |
| 1165 | * Subchannel was already shot down. We cannot prevent being called |
| 1166 | * twice since cio may trigger a shutdown asynchronously. |
| 1167 | */ |
| 1168 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { |
| 1169 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1170 | return 0; |
| 1171 | } |
| 1172 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1173 | tiqdio_remove_input_queues(irq_ptr); |
| 1174 | qdio_shutdown_queues(cdev); |
| 1175 | qdio_shutdown_debug_entries(irq_ptr, cdev); |
| 1176 | |
| 1177 | /* cleanup subchannel */ |
| 1178 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 1179 | |
| 1180 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) |
| 1181 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); |
| 1182 | else |
| 1183 | /* default behaviour is halt */ |
| 1184 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); |
| 1185 | if (rc) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1186 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
| 1187 | DBF_ERROR("rc:%4d", rc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1188 | goto no_cleanup; |
| 1189 | } |
| 1190 | |
| 1191 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); |
| 1192 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1193 | wait_event_interruptible_timeout(cdev->private->wait_q, |
| 1194 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || |
| 1195 | irq_ptr->state == QDIO_IRQ_STATE_ERR, |
| 1196 | 10 * HZ); |
| 1197 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 1198 | |
| 1199 | no_cleanup: |
| 1200 | qdio_shutdown_thinint(irq_ptr); |
| 1201 | |
| 1202 | /* restore interrupt handler */ |
| 1203 | if ((void *)cdev->handler == (void *)qdio_int_handler) |
| 1204 | cdev->handler = irq_ptr->orig_handler; |
| 1205 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1206 | |
| 1207 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); |
| 1208 | mutex_unlock(&irq_ptr->setup_mutex); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1209 | if (rc) |
| 1210 | return rc; |
| 1211 | return 0; |
| 1212 | } |
| 1213 | EXPORT_SYMBOL_GPL(qdio_shutdown); |
| 1214 | |
| 1215 | /** |
| 1216 | * qdio_free - free data structures for a qdio subchannel |
| 1217 | * @cdev: associated ccw device |
| 1218 | */ |
| 1219 | int qdio_free(struct ccw_device *cdev) |
| 1220 | { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1221 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1222 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1223 | if (!irq_ptr) |
| 1224 | return -ENODEV; |
| 1225 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1226 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1227 | mutex_lock(&irq_ptr->setup_mutex); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1228 | |
| 1229 | if (irq_ptr->debug_area != NULL) { |
| 1230 | debug_unregister(irq_ptr->debug_area); |
| 1231 | irq_ptr->debug_area = NULL; |
| 1232 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1233 | cdev->private->qdio_data = NULL; |
| 1234 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1235 | |
| 1236 | qdio_release_memory(irq_ptr); |
| 1237 | return 0; |
| 1238 | } |
| 1239 | EXPORT_SYMBOL_GPL(qdio_free); |
| 1240 | |
| 1241 | /** |
| 1242 | * qdio_initialize - allocate and establish queues for a qdio subchannel |
| 1243 | * @init_data: initialization data |
| 1244 | * |
| 1245 | * This function first allocates queues via qdio_allocate() and on success |
| 1246 | * establishes them via qdio_establish(). |
| 1247 | */ |
| 1248 | int qdio_initialize(struct qdio_initialize *init_data) |
| 1249 | { |
| 1250 | int rc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1251 | |
| 1252 | rc = qdio_allocate(init_data); |
| 1253 | if (rc) |
| 1254 | return rc; |
| 1255 | |
| 1256 | rc = qdio_establish(init_data); |
| 1257 | if (rc) |
| 1258 | qdio_free(init_data->cdev); |
| 1259 | return rc; |
| 1260 | } |
| 1261 | EXPORT_SYMBOL_GPL(qdio_initialize); |
| 1262 | |
| 1263 | /** |
| 1264 | * qdio_allocate - allocate qdio queues and associated data |
| 1265 | * @init_data: initialization data |
| 1266 | */ |
| 1267 | int qdio_allocate(struct qdio_initialize *init_data) |
| 1268 | { |
| 1269 | struct qdio_irq *irq_ptr; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1270 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1271 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1272 | |
| 1273 | if ((init_data->no_input_qs && !init_data->input_handler) || |
| 1274 | (init_data->no_output_qs && !init_data->output_handler)) |
| 1275 | return -EINVAL; |
| 1276 | |
| 1277 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || |
| 1278 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) |
| 1279 | return -EINVAL; |
| 1280 | |
| 1281 | if ((!init_data->input_sbal_addr_array) || |
| 1282 | (!init_data->output_sbal_addr_array)) |
| 1283 | return -EINVAL; |
| 1284 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1285 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
| 1286 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1287 | if (!irq_ptr) |
| 1288 | goto out_err; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1289 | |
| 1290 | mutex_init(&irq_ptr->setup_mutex); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1291 | qdio_allocate_dbf(init_data, irq_ptr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1292 | |
| 1293 | /* |
| 1294 | * Allocate a page for the chsc calls in qdio_establish. |
| 1295 | * Must be pre-allocated since a zfcp recovery will call |
| 1296 | * qdio_establish. In case of low memory and swap on a zfcp disk |
| 1297 | * we may not be able to allocate memory otherwise. |
| 1298 | */ |
| 1299 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); |
| 1300 | if (!irq_ptr->chsc_page) |
| 1301 | goto out_rel; |
| 1302 | |
| 1303 | /* qdr is used in ccw1.cda which is u32 */ |
Jan Glauber | 3b8e300 | 2008-08-01 16:39:17 +0200 | [diff] [blame] | 1304 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1305 | if (!irq_ptr->qdr) |
| 1306 | goto out_rel; |
| 1307 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); |
| 1308 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1309 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
| 1310 | init_data->no_output_qs)) |
| 1311 | goto out_rel; |
| 1312 | |
| 1313 | init_data->cdev->private->qdio_data = irq_ptr; |
| 1314 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); |
| 1315 | return 0; |
| 1316 | out_rel: |
| 1317 | qdio_release_memory(irq_ptr); |
| 1318 | out_err: |
| 1319 | return -ENOMEM; |
| 1320 | } |
| 1321 | EXPORT_SYMBOL_GPL(qdio_allocate); |
| 1322 | |
| 1323 | /** |
| 1324 | * qdio_establish - establish queues on a qdio subchannel |
| 1325 | * @init_data: initialization data |
| 1326 | */ |
| 1327 | int qdio_establish(struct qdio_initialize *init_data) |
| 1328 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1329 | struct qdio_irq *irq_ptr; |
| 1330 | struct ccw_device *cdev = init_data->cdev; |
| 1331 | unsigned long saveflags; |
| 1332 | int rc; |
| 1333 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1334 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 58eb27c | 2008-08-21 19:46:34 +0200 | [diff] [blame] | 1335 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1336 | irq_ptr = cdev->private->qdio_data; |
| 1337 | if (!irq_ptr) |
| 1338 | return -ENODEV; |
| 1339 | |
| 1340 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 1341 | return -EINVAL; |
| 1342 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1343 | mutex_lock(&irq_ptr->setup_mutex); |
| 1344 | qdio_setup_irq(init_data); |
| 1345 | |
| 1346 | rc = qdio_establish_thinint(irq_ptr); |
| 1347 | if (rc) { |
| 1348 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1349 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 1350 | return rc; |
| 1351 | } |
| 1352 | |
| 1353 | /* establish q */ |
| 1354 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; |
| 1355 | irq_ptr->ccw.flags = CCW_FLAG_SLI; |
| 1356 | irq_ptr->ccw.count = irq_ptr->equeue.count; |
| 1357 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); |
| 1358 | |
| 1359 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); |
| 1360 | ccw_device_set_options_mask(cdev, 0); |
| 1361 | |
| 1362 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); |
| 1363 | if (rc) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1364 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
| 1365 | DBF_ERROR("rc:%4x", rc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1366 | } |
| 1367 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); |
| 1368 | |
| 1369 | if (rc) { |
| 1370 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1371 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 1372 | return rc; |
| 1373 | } |
| 1374 | |
| 1375 | wait_event_interruptible_timeout(cdev->private->wait_q, |
| 1376 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || |
| 1377 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); |
| 1378 | |
| 1379 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { |
| 1380 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1381 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 1382 | return -EIO; |
| 1383 | } |
| 1384 | |
| 1385 | qdio_setup_ssqd_info(irq_ptr); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1386 | DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc); |
| 1387 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1388 | |
| 1389 | /* qebsm is now setup if available, initialize buffer states */ |
| 1390 | qdio_init_buf_states(irq_ptr); |
| 1391 | |
| 1392 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1393 | qdio_print_subchannel_info(irq_ptr, cdev); |
| 1394 | qdio_setup_debug_entries(irq_ptr, cdev); |
| 1395 | return 0; |
| 1396 | } |
| 1397 | EXPORT_SYMBOL_GPL(qdio_establish); |
| 1398 | |
| 1399 | /** |
| 1400 | * qdio_activate - activate queues on a qdio subchannel |
| 1401 | * @cdev: associated cdev |
| 1402 | */ |
| 1403 | int qdio_activate(struct ccw_device *cdev) |
| 1404 | { |
| 1405 | struct qdio_irq *irq_ptr; |
| 1406 | int rc; |
| 1407 | unsigned long saveflags; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1408 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1409 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 58eb27c | 2008-08-21 19:46:34 +0200 | [diff] [blame] | 1410 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1411 | irq_ptr = cdev->private->qdio_data; |
| 1412 | if (!irq_ptr) |
| 1413 | return -ENODEV; |
| 1414 | |
| 1415 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 1416 | return -EINVAL; |
| 1417 | |
| 1418 | mutex_lock(&irq_ptr->setup_mutex); |
| 1419 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { |
| 1420 | rc = -EBUSY; |
| 1421 | goto out; |
| 1422 | } |
| 1423 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1424 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
| 1425 | irq_ptr->ccw.flags = CCW_FLAG_SLI; |
| 1426 | irq_ptr->ccw.count = irq_ptr->aqueue.count; |
| 1427 | irq_ptr->ccw.cda = 0; |
| 1428 | |
| 1429 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); |
| 1430 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); |
| 1431 | |
| 1432 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, |
| 1433 | 0, DOIO_DENY_PREFETCH); |
| 1434 | if (rc) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1435 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
| 1436 | DBF_ERROR("rc:%4x", rc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1437 | } |
| 1438 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); |
| 1439 | |
| 1440 | if (rc) |
| 1441 | goto out; |
| 1442 | |
| 1443 | if (is_thinint_irq(irq_ptr)) |
| 1444 | tiqdio_add_input_queues(irq_ptr); |
| 1445 | |
| 1446 | /* wait for subchannel to become active */ |
| 1447 | msleep(5); |
| 1448 | |
| 1449 | switch (irq_ptr->state) { |
| 1450 | case QDIO_IRQ_STATE_STOPPED: |
| 1451 | case QDIO_IRQ_STATE_ERR: |
| 1452 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1453 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 1454 | return -EIO; |
| 1455 | default: |
| 1456 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); |
| 1457 | rc = 0; |
| 1458 | } |
| 1459 | out: |
| 1460 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1461 | return rc; |
| 1462 | } |
| 1463 | EXPORT_SYMBOL_GPL(qdio_activate); |
| 1464 | |
| 1465 | static inline int buf_in_between(int bufnr, int start, int count) |
| 1466 | { |
| 1467 | int end = add_buf(start, count); |
| 1468 | |
| 1469 | if (end > start) { |
| 1470 | if (bufnr >= start && bufnr < end) |
| 1471 | return 1; |
| 1472 | else |
| 1473 | return 0; |
| 1474 | } |
| 1475 | |
| 1476 | /* wrap-around case */ |
| 1477 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || |
| 1478 | (bufnr < end)) |
| 1479 | return 1; |
| 1480 | else |
| 1481 | return 0; |
| 1482 | } |
| 1483 | |
| 1484 | /** |
| 1485 | * handle_inbound - reset processed input buffers |
| 1486 | * @q: queue containing the buffers |
| 1487 | * @callflags: flags |
| 1488 | * @bufnr: first buffer to process |
| 1489 | * @count: how many buffers are emptied |
| 1490 | */ |
| 1491 | static void handle_inbound(struct qdio_q *q, unsigned int callflags, |
| 1492 | int bufnr, int count) |
| 1493 | { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 1494 | int used, rc, diff; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1495 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 1496 | if (!q->u.in.polling) |
| 1497 | goto set; |
| 1498 | |
| 1499 | /* protect against stop polling setting an ACK for an emptied slsb */ |
| 1500 | if (count == QDIO_MAX_BUFFERS_PER_Q) { |
| 1501 | /* overwriting everything, just delete polling status */ |
| 1502 | q->u.in.polling = 0; |
| 1503 | q->u.in.ack_count = 0; |
| 1504 | goto set; |
| 1505 | } else if (buf_in_between(q->last_move_ftc, bufnr, count)) { |
| 1506 | if (is_qebsm(q)) { |
| 1507 | /* partial overwrite, just update last_move_ftc */ |
| 1508 | diff = add_buf(bufnr, count); |
| 1509 | diff = sub_buf(diff, q->last_move_ftc); |
| 1510 | q->u.in.ack_count -= diff; |
| 1511 | if (q->u.in.ack_count <= 0) { |
| 1512 | q->u.in.polling = 0; |
| 1513 | q->u.in.ack_count = 0; |
| 1514 | /* TODO: must we set last_move_ftc to something meaningful? */ |
| 1515 | goto set; |
| 1516 | } |
| 1517 | q->last_move_ftc = add_buf(q->last_move_ftc, diff); |
| 1518 | } |
| 1519 | else |
| 1520 | /* the only ACK will be deleted, so stop polling */ |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1521 | q->u.in.polling = 0; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 1522 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1523 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 1524 | set: |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1525 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1526 | |
| 1527 | used = atomic_add_return(count, &q->nr_buf_used) - count; |
| 1528 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); |
| 1529 | |
| 1530 | /* no need to signal as long as the adapter had free buffers */ |
| 1531 | if (used) |
| 1532 | return; |
| 1533 | |
| 1534 | if (need_siga_in(q)) { |
| 1535 | rc = qdio_siga_input(q); |
| 1536 | if (rc) |
| 1537 | q->qdio_error = rc; |
| 1538 | } |
| 1539 | } |
| 1540 | |
| 1541 | /** |
| 1542 | * handle_outbound - process filled outbound buffers |
| 1543 | * @q: queue containing the buffers |
| 1544 | * @callflags: flags |
| 1545 | * @bufnr: first buffer to process |
| 1546 | * @count: how many buffers are filled |
| 1547 | */ |
| 1548 | static void handle_outbound(struct qdio_q *q, unsigned int callflags, |
| 1549 | int bufnr, int count) |
| 1550 | { |
| 1551 | unsigned char state; |
| 1552 | int used; |
| 1553 | |
| 1554 | qdio_perf_stat_inc(&perf_stats.outbound_handler); |
| 1555 | |
| 1556 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); |
| 1557 | used = atomic_add_return(count, &q->nr_buf_used); |
| 1558 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); |
| 1559 | |
| 1560 | if (callflags & QDIO_FLAG_PCI_OUT) |
| 1561 | q->u.out.pci_out_enabled = 1; |
| 1562 | else |
| 1563 | q->u.out.pci_out_enabled = 0; |
| 1564 | |
| 1565 | if (queue_type(q) == QDIO_IQDIO_QFMT) { |
| 1566 | if (multicast_outbound(q)) |
| 1567 | qdio_kick_outbound_q(q); |
| 1568 | else |
Klaus-Dieter Wacker | 7a0f475 | 2008-10-10 21:33:18 +0200 | [diff] [blame] | 1569 | if ((q->irq_ptr->ssqd_desc.mmwc > 1) && |
| 1570 | (count > 1) && |
| 1571 | (count <= q->irq_ptr->ssqd_desc.mmwc)) { |
| 1572 | /* exploit enhanced SIGA */ |
| 1573 | q->u.out.use_enh_siga = 1; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1574 | qdio_kick_outbound_q(q); |
Klaus-Dieter Wacker | 7a0f475 | 2008-10-10 21:33:18 +0200 | [diff] [blame] | 1575 | } else { |
| 1576 | /* |
| 1577 | * One siga-w per buffer required for unicast |
| 1578 | * HiperSockets. |
| 1579 | */ |
| 1580 | q->u.out.use_enh_siga = 0; |
| 1581 | while (count--) |
| 1582 | qdio_kick_outbound_q(q); |
| 1583 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1584 | goto out; |
| 1585 | } |
| 1586 | |
| 1587 | if (need_siga_sync(q)) { |
| 1588 | qdio_siga_sync_q(q); |
| 1589 | goto out; |
| 1590 | } |
| 1591 | |
| 1592 | /* try to fast requeue buffers */ |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame^] | 1593 | get_buf_state(q, prev_buf(bufnr), &state, 0); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1594 | if (state != SLSB_CU_OUTPUT_PRIMED) |
| 1595 | qdio_kick_outbound_q(q); |
| 1596 | else { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1597 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1598 | qdio_perf_stat_inc(&perf_stats.fast_requeue); |
| 1599 | } |
| 1600 | out: |
| 1601 | /* Fixme: could wait forever if called from process context */ |
| 1602 | tasklet_schedule(&q->tasklet); |
| 1603 | } |
| 1604 | |
| 1605 | /** |
| 1606 | * do_QDIO - process input or output buffers |
| 1607 | * @cdev: associated ccw_device for the qdio subchannel |
| 1608 | * @callflags: input or output and special flags from the program |
| 1609 | * @q_nr: queue number |
| 1610 | * @bufnr: buffer number |
| 1611 | * @count: how many buffers to process |
| 1612 | */ |
| 1613 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, |
| 1614 | int q_nr, int bufnr, int count) |
| 1615 | { |
| 1616 | struct qdio_irq *irq_ptr; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1617 | |
| 1618 | if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) || |
| 1619 | (count > QDIO_MAX_BUFFERS_PER_Q) || |
| 1620 | (q_nr > QDIO_MAX_QUEUES_PER_IRQ)) |
| 1621 | return -EINVAL; |
| 1622 | |
| 1623 | if (!count) |
| 1624 | return 0; |
| 1625 | |
| 1626 | irq_ptr = cdev->private->qdio_data; |
| 1627 | if (!irq_ptr) |
| 1628 | return -ENODEV; |
| 1629 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1630 | if (callflags & QDIO_FLAG_SYNC_INPUT) |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1631 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1632 | else |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1633 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output"); |
| 1634 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags); |
| 1635 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1636 | |
| 1637 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) |
| 1638 | return -EBUSY; |
| 1639 | |
| 1640 | if (callflags & QDIO_FLAG_SYNC_INPUT) |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1641 | handle_inbound(irq_ptr->input_qs[q_nr], callflags, bufnr, |
| 1642 | count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1643 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1644 | handle_outbound(irq_ptr->output_qs[q_nr], callflags, bufnr, |
| 1645 | count); |
| 1646 | else |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1647 | return -EINVAL; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1648 | return 0; |
| 1649 | } |
| 1650 | EXPORT_SYMBOL_GPL(do_QDIO); |
| 1651 | |
| 1652 | static int __init init_QDIO(void) |
| 1653 | { |
| 1654 | int rc; |
| 1655 | |
| 1656 | rc = qdio_setup_init(); |
| 1657 | if (rc) |
| 1658 | return rc; |
| 1659 | rc = tiqdio_allocate_memory(); |
| 1660 | if (rc) |
| 1661 | goto out_cache; |
| 1662 | rc = qdio_debug_init(); |
| 1663 | if (rc) |
| 1664 | goto out_ti; |
| 1665 | rc = qdio_setup_perf_stats(); |
| 1666 | if (rc) |
| 1667 | goto out_debug; |
| 1668 | rc = tiqdio_register_thinints(); |
| 1669 | if (rc) |
| 1670 | goto out_perf; |
| 1671 | return 0; |
| 1672 | |
| 1673 | out_perf: |
| 1674 | qdio_remove_perf_stats(); |
| 1675 | out_debug: |
| 1676 | qdio_debug_exit(); |
| 1677 | out_ti: |
| 1678 | tiqdio_free_memory(); |
| 1679 | out_cache: |
| 1680 | qdio_setup_exit(); |
| 1681 | return rc; |
| 1682 | } |
| 1683 | |
| 1684 | static void __exit exit_QDIO(void) |
| 1685 | { |
| 1686 | tiqdio_unregister_thinints(); |
| 1687 | tiqdio_free_memory(); |
| 1688 | qdio_remove_perf_stats(); |
| 1689 | qdio_debug_exit(); |
| 1690 | qdio_setup_exit(); |
| 1691 | } |
| 1692 | |
| 1693 | module_init(init_QDIO); |
| 1694 | module_exit(exit_QDIO); |