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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/gfp.h> |
Jan Glauber | 30d77c3 | 2011-01-05 12:47:29 +0100 | [diff] [blame] | 17 | #include <linux/kernel_stat.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 18 | #include <linux/atomic.h> |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 19 | #include <asm/debug.h> |
| 20 | #include <asm/qdio.h> |
| 21 | |
| 22 | #include "cio.h" |
| 23 | #include "css.h" |
| 24 | #include "device.h" |
| 25 | #include "qdio.h" |
| 26 | #include "qdio_debug.h" |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 27 | |
| 28 | MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ |
| 29 | "Jan Glauber <jang@linux.vnet.ibm.com>"); |
| 30 | MODULE_DESCRIPTION("QDIO base support"); |
| 31 | MODULE_LICENSE("GPL"); |
| 32 | |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 33 | static inline int do_siga_sync(unsigned long schid, |
| 34 | unsigned int out_mask, unsigned int in_mask, |
| 35 | unsigned int fc) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 36 | { |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 37 | register unsigned long __fc asm ("0") = fc; |
| 38 | register unsigned long __schid asm ("1") = schid; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 39 | register unsigned long out asm ("2") = out_mask; |
| 40 | register unsigned long in asm ("3") = in_mask; |
| 41 | int cc; |
| 42 | |
| 43 | asm volatile( |
| 44 | " siga 0\n" |
| 45 | " ipm %0\n" |
| 46 | " srl %0,28\n" |
| 47 | : "=d" (cc) |
| 48 | : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc"); |
| 49 | return cc; |
| 50 | } |
| 51 | |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 52 | static inline int do_siga_input(unsigned long schid, unsigned int mask, |
| 53 | unsigned int fc) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 54 | { |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 55 | register unsigned long __fc asm ("0") = fc; |
| 56 | register unsigned long __schid asm ("1") = schid; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 57 | register unsigned long __mask asm ("2") = mask; |
| 58 | int cc; |
| 59 | |
| 60 | asm volatile( |
| 61 | " siga 0\n" |
| 62 | " ipm %0\n" |
| 63 | " srl %0,28\n" |
| 64 | : "=d" (cc) |
| 65 | : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory"); |
| 66 | return cc; |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * do_siga_output - perform SIGA-w/wt function |
| 71 | * @schid: subchannel id or in case of QEBSM the subchannel token |
| 72 | * @mask: which output queues to process |
| 73 | * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer |
| 74 | * @fc: function code to perform |
| 75 | * |
| 76 | * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION. |
| 77 | * Note: For IQDC unicast queues only the highest priority queue is processed. |
| 78 | */ |
| 79 | static inline int do_siga_output(unsigned long schid, unsigned long mask, |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 80 | unsigned int *bb, unsigned int fc) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 81 | { |
| 82 | register unsigned long __fc asm("0") = fc; |
| 83 | register unsigned long __schid asm("1") = schid; |
| 84 | register unsigned long __mask asm("2") = mask; |
| 85 | int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION; |
| 86 | |
| 87 | asm volatile( |
| 88 | " siga 0\n" |
| 89 | "0: ipm %0\n" |
| 90 | " srl %0,28\n" |
| 91 | "1:\n" |
| 92 | EX_TABLE(0b, 1b) |
| 93 | : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask) |
| 94 | : : "cc", "memory"); |
| 95 | *bb = ((unsigned int) __fc) >> 31; |
| 96 | return cc; |
| 97 | } |
| 98 | |
| 99 | static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq) |
| 100 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 101 | /* all done or next buffer state different */ |
| 102 | if (ccq == 0 || ccq == 32) |
| 103 | return 0; |
| 104 | /* not all buffers processed */ |
| 105 | if (ccq == 96 || ccq == 97) |
| 106 | return 1; |
| 107 | /* notify devices immediately */ |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 108 | DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 109 | return -EIO; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * qdio_do_eqbs - extract buffer states for QEBSM |
| 114 | * @q: queue to manipulate |
| 115 | * @state: state of the extracted buffers |
| 116 | * @start: buffer number to start at |
| 117 | * @count: count of buffers to examine |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 118 | * @auto_ack: automatically acknowledge buffers |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 119 | * |
Coly Li | 73ac36e | 2009-01-07 18:09:16 -0800 | [diff] [blame] | 120 | * Returns the number of successfully extracted equal buffer states. |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 121 | * Stops processing if a state is different from the last buffers state. |
| 122 | */ |
| 123 | static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state, |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 124 | int start, int count, int auto_ack) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 125 | { |
| 126 | unsigned int ccq = 0; |
| 127 | int tmp_count = count, tmp_start = start; |
| 128 | int nr = q->nr; |
| 129 | int rc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 130 | |
| 131 | BUG_ON(!q->irq_ptr->sch_token); |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 132 | qperf_inc(q, eqbs); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 133 | |
| 134 | if (!q->is_input_q) |
| 135 | nr += q->irq_ptr->nr_input_qs; |
| 136 | again: |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 137 | ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count, |
| 138 | auto_ack); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 139 | rc = qdio_check_ccq(q, ccq); |
| 140 | |
| 141 | /* At least one buffer was processed, return and extract the remaining |
| 142 | * buffers later. |
| 143 | */ |
Jan Glauber | 23589d0 | 2008-12-25 13:38:44 +0100 | [diff] [blame] | 144 | if ((ccq == 96) && (count != tmp_count)) { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 145 | qperf_inc(q, eqbs_partial); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 146 | return (count - tmp_count); |
Jan Glauber | 23589d0 | 2008-12-25 13:38:44 +0100 | [diff] [blame] | 147 | } |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 148 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 149 | if (rc == 1) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 150 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 151 | goto again; |
| 152 | } |
| 153 | |
| 154 | if (rc < 0) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 155 | DBF_ERROR("%4x EQBS ERROR", SCH_NO(q)); |
| 156 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 157 | q->handler(q->irq_ptr->cdev, |
| 158 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, |
| 159 | 0, -1, -1, q->irq_ptr->int_parm); |
| 160 | return 0; |
| 161 | } |
| 162 | return count - tmp_count; |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * qdio_do_sqbs - set buffer states for QEBSM |
| 167 | * @q: queue to manipulate |
| 168 | * @state: new state of the buffers |
| 169 | * @start: first buffer number to change |
| 170 | * @count: how many buffers to change |
| 171 | * |
| 172 | * Returns the number of successfully changed buffers. |
| 173 | * Does retrying until the specified count of buffer states is set or an |
| 174 | * error occurs. |
| 175 | */ |
| 176 | static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start, |
| 177 | int count) |
| 178 | { |
| 179 | unsigned int ccq = 0; |
| 180 | int tmp_count = count, tmp_start = start; |
| 181 | int nr = q->nr; |
| 182 | int rc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 183 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 184 | if (!count) |
| 185 | return 0; |
| 186 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 187 | BUG_ON(!q->irq_ptr->sch_token); |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 188 | qperf_inc(q, sqbs); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 189 | |
| 190 | if (!q->is_input_q) |
| 191 | nr += q->irq_ptr->nr_input_qs; |
| 192 | again: |
| 193 | ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count); |
| 194 | rc = qdio_check_ccq(q, ccq); |
| 195 | if (rc == 1) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 196 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq); |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 197 | qperf_inc(q, sqbs_partial); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 198 | goto again; |
| 199 | } |
| 200 | if (rc < 0) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 201 | DBF_ERROR("%4x SQBS ERROR", SCH_NO(q)); |
| 202 | DBF_ERROR("%3d%3d%2d", count, tmp_count, nr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 203 | q->handler(q->irq_ptr->cdev, |
| 204 | QDIO_ERROR_ACTIVATE_CHECK_CONDITION, |
| 205 | 0, -1, -1, q->irq_ptr->int_parm); |
| 206 | return 0; |
| 207 | } |
| 208 | WARN_ON(tmp_count); |
| 209 | return count - tmp_count; |
| 210 | } |
| 211 | |
| 212 | /* returns number of examined buffers and their common state in *state */ |
| 213 | 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] | 214 | unsigned char *state, unsigned int count, |
| 215 | int auto_ack) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 216 | { |
| 217 | unsigned char __state = 0; |
| 218 | int i; |
| 219 | |
| 220 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); |
| 221 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); |
| 222 | |
| 223 | if (is_qebsm(q)) |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 224 | return qdio_do_eqbs(q, state, bufnr, count, auto_ack); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 225 | |
| 226 | for (i = 0; i < count; i++) { |
| 227 | if (!__state) |
| 228 | __state = q->slsb.val[bufnr]; |
| 229 | else if (q->slsb.val[bufnr] != __state) |
| 230 | break; |
| 231 | bufnr = next_buf(bufnr); |
| 232 | } |
| 233 | *state = __state; |
| 234 | return i; |
| 235 | } |
| 236 | |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 237 | static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr, |
| 238 | unsigned char *state, int auto_ack) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 239 | { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 240 | return get_buf_states(q, bufnr, state, 1, auto_ack); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | /* wrap-around safe setting of slsb states, returns number of changed buffers */ |
| 244 | static inline int set_buf_states(struct qdio_q *q, int bufnr, |
| 245 | unsigned char state, int count) |
| 246 | { |
| 247 | int i; |
| 248 | |
| 249 | BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK); |
| 250 | BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q); |
| 251 | |
| 252 | if (is_qebsm(q)) |
| 253 | return qdio_do_sqbs(q, state, bufnr, count); |
| 254 | |
| 255 | for (i = 0; i < count; i++) { |
| 256 | xchg(&q->slsb.val[bufnr], state); |
| 257 | bufnr = next_buf(bufnr); |
| 258 | } |
| 259 | return count; |
| 260 | } |
| 261 | |
| 262 | static inline int set_buf_state(struct qdio_q *q, int bufnr, |
| 263 | unsigned char state) |
| 264 | { |
| 265 | return set_buf_states(q, bufnr, state, 1); |
| 266 | } |
| 267 | |
| 268 | /* set slsb states to initial state */ |
| 269 | void qdio_init_buf_states(struct qdio_irq *irq_ptr) |
| 270 | { |
| 271 | struct qdio_q *q; |
| 272 | int i; |
| 273 | |
| 274 | for_each_input_queue(irq_ptr, q, i) |
| 275 | set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT, |
| 276 | QDIO_MAX_BUFFERS_PER_Q); |
| 277 | for_each_output_queue(irq_ptr, q, i) |
| 278 | set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT, |
| 279 | QDIO_MAX_BUFFERS_PER_Q); |
| 280 | } |
| 281 | |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 282 | static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 283 | unsigned int input) |
| 284 | { |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 285 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
| 286 | unsigned int fc = QDIO_SIGA_SYNC; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 287 | int cc; |
| 288 | |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 289 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 290 | qperf_inc(q, siga_sync); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 291 | |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 292 | if (is_qebsm(q)) { |
| 293 | schid = q->irq_ptr->sch_token; |
| 294 | fc |= QDIO_SIGA_QEBSM_FLAG; |
| 295 | } |
| 296 | |
| 297 | cc = do_siga_sync(schid, output, input, fc); |
Jan Glauber | 110da31 | 2011-01-05 12:47:53 +0100 | [diff] [blame] | 298 | if (unlikely(cc)) |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 299 | DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 300 | return cc; |
| 301 | } |
| 302 | |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 303 | static inline int qdio_siga_sync_q(struct qdio_q *q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 304 | { |
| 305 | if (q->is_input_q) |
| 306 | return qdio_siga_sync(q, 0, q->mask); |
| 307 | else |
| 308 | return qdio_siga_sync(q, q->mask, 0); |
| 309 | } |
| 310 | |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 311 | static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 312 | { |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 313 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
| 314 | unsigned int fc = QDIO_SIGA_WRITE; |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 315 | u64 start_time = 0; |
Jan Glauber | be8d97a | 2011-08-03 16:44:17 +0200 | [diff] [blame] | 316 | int retries = 0, cc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 317 | |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 318 | if (is_qebsm(q)) { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 319 | schid = q->irq_ptr->sch_token; |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 320 | fc |= QDIO_SIGA_QEBSM_FLAG; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 321 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 322 | again: |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 323 | cc = do_siga_output(schid, q->mask, busy_bit, fc); |
Jan Glauber | 58eb27c | 2008-08-21 19:46:34 +0200 | [diff] [blame] | 324 | |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 325 | /* hipersocket busy condition */ |
Jan Glauber | 110da31 | 2011-01-05 12:47:53 +0100 | [diff] [blame] | 326 | if (unlikely(*busy_bit)) { |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 327 | WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2); |
Jan Glauber | be8d97a | 2011-08-03 16:44:17 +0200 | [diff] [blame] | 328 | retries++; |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 329 | |
| 330 | if (!start_time) { |
Jan Glauber | 3a601bf | 2010-05-17 10:00:17 +0200 | [diff] [blame] | 331 | start_time = get_clock(); |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 332 | goto again; |
| 333 | } |
Jan Glauber | 3a601bf | 2010-05-17 10:00:17 +0200 | [diff] [blame] | 334 | if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 335 | goto again; |
| 336 | } |
Jan Glauber | be8d97a | 2011-08-03 16:44:17 +0200 | [diff] [blame] | 337 | if (retries) { |
| 338 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, |
| 339 | "%4x cc2 BB1:%1d", SCH_NO(q), q->nr); |
| 340 | DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries); |
| 341 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 342 | return cc; |
| 343 | } |
| 344 | |
| 345 | static inline int qdio_siga_input(struct qdio_q *q) |
| 346 | { |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 347 | unsigned long schid = *((u32 *) &q->irq_ptr->schid); |
| 348 | unsigned int fc = QDIO_SIGA_READ; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 349 | int cc; |
| 350 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 351 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 352 | qperf_inc(q, siga_read); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 353 | |
Jan Glauber | 958c0ba | 2011-01-05 12:47:52 +0100 | [diff] [blame] | 354 | if (is_qebsm(q)) { |
| 355 | schid = q->irq_ptr->sch_token; |
| 356 | fc |= QDIO_SIGA_QEBSM_FLAG; |
| 357 | } |
| 358 | |
| 359 | cc = do_siga_input(schid, q->mask, fc); |
Jan Glauber | 110da31 | 2011-01-05 12:47:53 +0100 | [diff] [blame] | 360 | if (unlikely(cc)) |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 361 | DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 362 | return cc; |
| 363 | } |
| 364 | |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 365 | #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0) |
| 366 | #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U) |
| 367 | |
| 368 | static inline void qdio_sync_queues(struct qdio_q *q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 369 | { |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 370 | /* PCI capable outbound queues will also be scanned so sync them too */ |
| 371 | if (pci_out_supported(q)) |
| 372 | qdio_siga_sync_all(q); |
| 373 | else |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 374 | qdio_siga_sync_q(q); |
| 375 | } |
| 376 | |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 377 | int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, |
| 378 | unsigned char *state) |
| 379 | { |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 380 | if (need_siga_sync(q)) |
| 381 | qdio_siga_sync_q(q); |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 382 | return get_buf_states(q, bufnr, state, 1, 0); |
| 383 | } |
| 384 | |
| 385 | static inline void qdio_stop_polling(struct qdio_q *q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 386 | { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 387 | if (!q->u.in.polling) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 388 | return; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 389 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 390 | q->u.in.polling = 0; |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 391 | qperf_inc(q, stop_polling); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 392 | |
| 393 | /* show the card that we are not polling anymore */ |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 394 | if (is_qebsm(q)) { |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 395 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 396 | q->u.in.ack_count); |
| 397 | q->u.in.ack_count = 0; |
| 398 | } else |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 399 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 400 | } |
| 401 | |
Jan Glauber | d307297 | 2010-02-26 22:37:36 +0100 | [diff] [blame] | 402 | static inline void account_sbals(struct qdio_q *q, int count) |
| 403 | { |
| 404 | int pos = 0; |
| 405 | |
| 406 | q->q_stats.nr_sbal_total += count; |
| 407 | if (count == QDIO_MAX_BUFFERS_MASK) { |
| 408 | q->q_stats.nr_sbals[7]++; |
| 409 | return; |
| 410 | } |
| 411 | while (count >>= 1) |
| 412 | pos++; |
| 413 | q->q_stats.nr_sbals[pos]++; |
| 414 | } |
| 415 | |
Jan Glauber | bffbbd2 | 2011-04-20 10:15:33 +0200 | [diff] [blame] | 416 | static void process_buffer_error(struct qdio_q *q, int count) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 417 | { |
Jan Glauber | bffbbd2 | 2011-04-20 10:15:33 +0200 | [diff] [blame] | 418 | unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT : |
| 419 | SLSB_P_OUTPUT_NOT_INIT; |
| 420 | |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 421 | q->qdio_error |= QDIO_ERROR_SLSB_STATE; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 422 | |
| 423 | /* special handling for no target buffer empty */ |
| 424 | if ((!q->is_input_q && |
Jan Glauber | 3ec90878 | 2011-06-06 14:14:40 +0200 | [diff] [blame] | 425 | (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 426 | qperf_inc(q, target_full); |
Jan Glauber | 1d7e150 | 2009-09-22 22:58:39 +0200 | [diff] [blame] | 427 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 428 | q->first_to_check); |
| 429 | return; |
| 430 | } |
| 431 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 432 | DBF_ERROR("%4x BUF ERROR", SCH_NO(q)); |
| 433 | DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 434 | DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 435 | DBF_ERROR("F14:%2x F15:%2x", |
Jan Glauber | 3ec90878 | 2011-06-06 14:14:40 +0200 | [diff] [blame] | 436 | q->sbal[q->first_to_check]->element[14].sflags, |
| 437 | q->sbal[q->first_to_check]->element[15].sflags); |
Jan Glauber | bffbbd2 | 2011-04-20 10:15:33 +0200 | [diff] [blame] | 438 | |
| 439 | /* |
| 440 | * Interrupts may be avoided as long as the error is present |
| 441 | * so change the buffer state immediately to avoid starvation. |
| 442 | */ |
| 443 | set_buf_states(q, q->first_to_check, state, count); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 444 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 445 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 446 | static inline void inbound_primed(struct qdio_q *q, int count) |
| 447 | { |
| 448 | int new; |
| 449 | |
Jan Glauber | 1d7e150 | 2009-09-22 22:58:39 +0200 | [diff] [blame] | 450 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 451 | |
| 452 | /* for QEBSM the ACK was already set by EQBS */ |
| 453 | if (is_qebsm(q)) { |
| 454 | if (!q->u.in.polling) { |
| 455 | q->u.in.polling = 1; |
| 456 | q->u.in.ack_count = count; |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 457 | q->u.in.ack_start = q->first_to_check; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 458 | return; |
| 459 | } |
| 460 | |
| 461 | /* delete the previous ACK's */ |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 462 | set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT, |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 463 | q->u.in.ack_count); |
| 464 | q->u.in.ack_count = count; |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 465 | q->u.in.ack_start = q->first_to_check; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 466 | return; |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * ACK the newest buffer. The ACK will be removed in qdio_stop_polling |
| 471 | * or by the next inbound run. |
| 472 | */ |
| 473 | new = add_buf(q->first_to_check, count - 1); |
| 474 | if (q->u.in.polling) { |
| 475 | /* reset the previous ACK but first set the new one */ |
| 476 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 477 | set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT); |
Jan Glauber | 3fdf1e1 | 2009-03-26 15:24:28 +0100 | [diff] [blame] | 478 | } else { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 479 | q->u.in.polling = 1; |
Jan Glauber | 3fdf1e1 | 2009-03-26 15:24:28 +0100 | [diff] [blame] | 480 | set_buf_state(q, new, SLSB_P_INPUT_ACK); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 481 | } |
| 482 | |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 483 | q->u.in.ack_start = new; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 484 | count--; |
| 485 | if (!count) |
| 486 | return; |
Jan Glauber | 6541f7b | 2009-09-22 22:58:40 +0200 | [diff] [blame] | 487 | /* need to change ALL buffers to get more interrupts */ |
| 488 | set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 489 | } |
| 490 | |
| 491 | static int get_inbound_buffer_frontier(struct qdio_q *q) |
| 492 | { |
| 493 | int count, stop; |
Jan Glauber | 6fa1098 | 2011-01-31 11:30:08 +0100 | [diff] [blame] | 494 | unsigned char state = 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 495 | |
| 496 | /* |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 497 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved |
| 498 | * would return 0. |
| 499 | */ |
| 500 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); |
| 501 | stop = add_buf(q->first_to_check, count); |
| 502 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 503 | if (q->first_to_check == stop) |
| 504 | goto out; |
| 505 | |
Jan Glauber | 36e3e72 | 2009-06-22 12:08:12 +0200 | [diff] [blame] | 506 | /* |
| 507 | * No siga sync here, as a PCI or we after a thin interrupt |
| 508 | * already sync'ed the queues. |
| 509 | */ |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 510 | count = get_buf_states(q, q->first_to_check, &state, count, 1); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 511 | if (!count) |
| 512 | goto out; |
| 513 | |
| 514 | switch (state) { |
| 515 | case SLSB_P_INPUT_PRIMED: |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 516 | inbound_primed(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 517 | q->first_to_check = add_buf(q->first_to_check, count); |
Jan Glauber | 8bcd9b0 | 2009-12-18 17:43:26 +0100 | [diff] [blame] | 518 | if (atomic_sub(count, &q->nr_buf_used) == 0) |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 519 | qperf_inc(q, inbound_queue_full); |
Jan Glauber | d307297 | 2010-02-26 22:37:36 +0100 | [diff] [blame] | 520 | if (q->irq_ptr->perf_stat_enabled) |
| 521 | account_sbals(q, count); |
Jan Glauber | 36e3e72 | 2009-06-22 12:08:12 +0200 | [diff] [blame] | 522 | break; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 523 | case SLSB_P_INPUT_ERROR: |
Jan Glauber | bffbbd2 | 2011-04-20 10:15:33 +0200 | [diff] [blame] | 524 | process_buffer_error(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 525 | q->first_to_check = add_buf(q->first_to_check, count); |
| 526 | atomic_sub(count, &q->nr_buf_used); |
Jan Glauber | d307297 | 2010-02-26 22:37:36 +0100 | [diff] [blame] | 527 | if (q->irq_ptr->perf_stat_enabled) |
| 528 | account_sbals_error(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 529 | break; |
| 530 | case SLSB_CU_INPUT_EMPTY: |
| 531 | case SLSB_P_INPUT_NOT_INIT: |
| 532 | case SLSB_P_INPUT_ACK: |
Jan Glauber | d307297 | 2010-02-26 22:37:36 +0100 | [diff] [blame] | 533 | if (q->irq_ptr->perf_stat_enabled) |
| 534 | q->q_stats.nr_sbal_nop++; |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 535 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop"); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 536 | break; |
| 537 | default: |
| 538 | BUG(); |
| 539 | } |
| 540 | out: |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 541 | return q->first_to_check; |
| 542 | } |
| 543 | |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 544 | static int qdio_inbound_q_moved(struct qdio_q *q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 545 | { |
| 546 | int bufnr; |
| 547 | |
| 548 | bufnr = get_inbound_buffer_frontier(q); |
| 549 | |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 550 | if ((bufnr != q->last_move) || q->qdio_error) { |
| 551 | q->last_move = bufnr; |
Martin Schwidefsky | 27d7160 | 2010-02-26 22:37:38 +0100 | [diff] [blame] | 552 | if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR) |
Jan Glauber | 3a601bf | 2010-05-17 10:00:17 +0200 | [diff] [blame] | 553 | q->u.in.timestamp = get_clock(); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 554 | return 1; |
| 555 | } else |
| 556 | return 0; |
| 557 | } |
| 558 | |
Jan Glauber | 9a2c160 | 2009-06-22 12:08:11 +0200 | [diff] [blame] | 559 | static inline int qdio_inbound_q_done(struct qdio_q *q) |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 560 | { |
| 561 | unsigned char state = 0; |
| 562 | |
| 563 | if (!atomic_read(&q->nr_buf_used)) |
| 564 | return 1; |
| 565 | |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 566 | if (need_siga_sync(q)) |
| 567 | qdio_siga_sync_q(q); |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 568 | get_buf_state(q, q->first_to_check, &state, 0); |
| 569 | |
Ursula Braun | 4c52228 | 2010-02-09 09:46:07 +0100 | [diff] [blame] | 570 | if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR) |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 571 | /* more work coming */ |
| 572 | return 0; |
Jan Glauber | 9a2c160 | 2009-06-22 12:08:11 +0200 | [diff] [blame] | 573 | |
| 574 | if (is_thinint_irq(q->irq_ptr)) |
| 575 | return 1; |
| 576 | |
| 577 | /* don't poll under z/VM */ |
| 578 | if (MACHINE_IS_VM) |
| 579 | return 1; |
| 580 | |
| 581 | /* |
| 582 | * At this point we know, that inbound first_to_check |
| 583 | * has (probably) not moved (see qdio_inbound_processing). |
| 584 | */ |
Jan Glauber | 3a601bf | 2010-05-17 10:00:17 +0200 | [diff] [blame] | 585 | if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { |
Jan Glauber | 1d7e150 | 2009-09-22 22:58:39 +0200 | [diff] [blame] | 586 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", |
Jan Glauber | 9a2c160 | 2009-06-22 12:08:11 +0200 | [diff] [blame] | 587 | q->first_to_check); |
| 588 | return 1; |
| 589 | } else |
| 590 | return 0; |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | static void qdio_kick_handler(struct qdio_q *q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 594 | { |
Jan Glauber | 9c8a08d | 2009-03-26 15:24:32 +0100 | [diff] [blame] | 595 | int start = q->first_to_kick; |
| 596 | int end = q->first_to_check; |
| 597 | int count; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 598 | |
| 599 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) |
| 600 | return; |
| 601 | |
Jan Glauber | 9c8a08d | 2009-03-26 15:24:32 +0100 | [diff] [blame] | 602 | count = sub_buf(end, start); |
| 603 | |
| 604 | if (q->is_input_q) { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 605 | qperf_inc(q, inbound_handler); |
Jan Glauber | 1d7e150 | 2009-09-22 22:58:39 +0200 | [diff] [blame] | 606 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count); |
Ursula Braun | bd6e8a1 | 2010-03-08 12:25:18 +0100 | [diff] [blame] | 607 | } else { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 608 | qperf_inc(q, outbound_handler); |
Jan Glauber | 1d7e150 | 2009-09-22 22:58:39 +0200 | [diff] [blame] | 609 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x", |
| 610 | start, count); |
Ursula Braun | bd6e8a1 | 2010-03-08 12:25:18 +0100 | [diff] [blame] | 611 | } |
Jan Glauber | 9c8a08d | 2009-03-26 15:24:32 +0100 | [diff] [blame] | 612 | |
| 613 | q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count, |
| 614 | q->irq_ptr->int_parm); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 615 | |
| 616 | /* for the next time */ |
Jan Glauber | 9c8a08d | 2009-03-26 15:24:32 +0100 | [diff] [blame] | 617 | q->first_to_kick = end; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 618 | q->qdio_error = 0; |
| 619 | } |
| 620 | |
| 621 | static void __qdio_inbound_processing(struct qdio_q *q) |
| 622 | { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 623 | qperf_inc(q, tasklet_inbound); |
Jan Glauber | f3eb20f | 2010-05-17 10:00:15 +0200 | [diff] [blame] | 624 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 625 | if (!qdio_inbound_q_moved(q)) |
| 626 | return; |
| 627 | |
Jan Glauber | 9c8a08d | 2009-03-26 15:24:32 +0100 | [diff] [blame] | 628 | qdio_kick_handler(q); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 629 | |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 630 | if (!qdio_inbound_q_done(q)) { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 631 | /* means poll time is not yet over */ |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 632 | qperf_inc(q, tasklet_inbound_resched); |
Jan Glauber | f3eb20f | 2010-05-17 10:00:15 +0200 | [diff] [blame] | 633 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
| 634 | tasklet_schedule(&q->tasklet); |
| 635 | return; |
| 636 | } |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 637 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 638 | |
| 639 | qdio_stop_polling(q); |
| 640 | /* |
| 641 | * We need to check again to not lose initiative after |
| 642 | * resetting the ACK state. |
| 643 | */ |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 644 | if (!qdio_inbound_q_done(q)) { |
| 645 | qperf_inc(q, tasklet_inbound_resched2); |
Jan Glauber | f3eb20f | 2010-05-17 10:00:15 +0200 | [diff] [blame] | 646 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
| 647 | tasklet_schedule(&q->tasklet); |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 648 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 649 | } |
| 650 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 651 | void qdio_inbound_processing(unsigned long data) |
| 652 | { |
| 653 | struct qdio_q *q = (struct qdio_q *)data; |
| 654 | __qdio_inbound_processing(q); |
| 655 | } |
| 656 | |
| 657 | static int get_outbound_buffer_frontier(struct qdio_q *q) |
| 658 | { |
| 659 | int count, stop; |
Jan Glauber | 6fa1098 | 2011-01-31 11:30:08 +0100 | [diff] [blame] | 660 | unsigned char state = 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 661 | |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 662 | if (need_siga_sync(q)) |
| 663 | if (((queue_type(q) != QDIO_IQDIO_QFMT) && |
| 664 | !pci_out_supported(q)) || |
| 665 | (queue_type(q) == QDIO_IQDIO_QFMT && |
| 666 | multicast_outbound(q))) |
| 667 | qdio_siga_sync_q(q); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 668 | |
| 669 | /* |
| 670 | * Don't check 128 buffers, as otherwise qdio_inbound_q_moved |
| 671 | * would return 0. |
| 672 | */ |
| 673 | count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK); |
| 674 | stop = add_buf(q->first_to_check, count); |
| 675 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 676 | if (q->first_to_check == stop) |
| 677 | return q->first_to_check; |
| 678 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 679 | count = get_buf_states(q, q->first_to_check, &state, count, 0); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 680 | if (!count) |
| 681 | return q->first_to_check; |
| 682 | |
| 683 | switch (state) { |
| 684 | case SLSB_P_OUTPUT_EMPTY: |
| 685 | /* the adapter got it */ |
Jan Glauber | 1d7e150 | 2009-09-22 22:58:39 +0200 | [diff] [blame] | 686 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 687 | |
| 688 | atomic_sub(count, &q->nr_buf_used); |
| 689 | q->first_to_check = add_buf(q->first_to_check, count); |
Jan Glauber | d307297 | 2010-02-26 22:37:36 +0100 | [diff] [blame] | 690 | if (q->irq_ptr->perf_stat_enabled) |
| 691 | account_sbals(q, count); |
Jan Glauber | 36e3e72 | 2009-06-22 12:08:12 +0200 | [diff] [blame] | 692 | break; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 693 | case SLSB_P_OUTPUT_ERROR: |
Jan Glauber | bffbbd2 | 2011-04-20 10:15:33 +0200 | [diff] [blame] | 694 | process_buffer_error(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 695 | q->first_to_check = add_buf(q->first_to_check, count); |
| 696 | atomic_sub(count, &q->nr_buf_used); |
Jan Glauber | d307297 | 2010-02-26 22:37:36 +0100 | [diff] [blame] | 697 | if (q->irq_ptr->perf_stat_enabled) |
| 698 | account_sbals_error(q, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 699 | break; |
| 700 | case SLSB_CU_OUTPUT_PRIMED: |
| 701 | /* the adapter has not fetched the output yet */ |
Jan Glauber | d307297 | 2010-02-26 22:37:36 +0100 | [diff] [blame] | 702 | if (q->irq_ptr->perf_stat_enabled) |
| 703 | q->q_stats.nr_sbal_nop++; |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 704 | 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] | 705 | break; |
| 706 | case SLSB_P_OUTPUT_NOT_INIT: |
| 707 | case SLSB_P_OUTPUT_HALTED: |
| 708 | break; |
| 709 | default: |
| 710 | BUG(); |
| 711 | } |
| 712 | return q->first_to_check; |
| 713 | } |
| 714 | |
| 715 | /* all buffers processed? */ |
| 716 | static inline int qdio_outbound_q_done(struct qdio_q *q) |
| 717 | { |
| 718 | return atomic_read(&q->nr_buf_used) == 0; |
| 719 | } |
| 720 | |
| 721 | static inline int qdio_outbound_q_moved(struct qdio_q *q) |
| 722 | { |
| 723 | int bufnr; |
| 724 | |
| 725 | bufnr = get_outbound_buffer_frontier(q); |
| 726 | |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 727 | if ((bufnr != q->last_move) || q->qdio_error) { |
| 728 | q->last_move = bufnr; |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 729 | 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] | 730 | return 1; |
| 731 | } else |
| 732 | return 0; |
| 733 | } |
| 734 | |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 735 | static int qdio_kick_outbound_q(struct qdio_q *q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 736 | { |
Jan Glauber | be8d97a | 2011-08-03 16:44:17 +0200 | [diff] [blame] | 737 | int retries = 0, cc; |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 738 | unsigned int busy_bit; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 739 | |
| 740 | if (!need_siga_out(q)) |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 741 | return 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 742 | |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 743 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr); |
Jan Glauber | be8d97a | 2011-08-03 16:44:17 +0200 | [diff] [blame] | 744 | retry: |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 745 | qperf_inc(q, siga_write); |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 746 | |
| 747 | cc = qdio_siga_output(q, &busy_bit); |
| 748 | switch (cc) { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 749 | case 0: |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 750 | break; |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 751 | case 2: |
| 752 | if (busy_bit) { |
Jan Glauber | be8d97a | 2011-08-03 16:44:17 +0200 | [diff] [blame] | 753 | while (++retries < QDIO_BUSY_BIT_RETRIES) { |
| 754 | mdelay(QDIO_BUSY_BIT_RETRY_DELAY); |
| 755 | goto retry; |
| 756 | } |
| 757 | DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr); |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 758 | cc |= QDIO_ERROR_SIGA_BUSY; |
| 759 | } else |
| 760 | DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr); |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 761 | break; |
| 762 | case 1: |
| 763 | case 3: |
| 764 | DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc); |
Jan Glauber | 7a0b4cb | 2008-12-25 13:38:48 +0100 | [diff] [blame] | 765 | break; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 766 | } |
Jan Glauber | be8d97a | 2011-08-03 16:44:17 +0200 | [diff] [blame] | 767 | if (retries) { |
| 768 | DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr); |
| 769 | DBF_ERROR("count:%u", retries); |
| 770 | } |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 771 | return cc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 772 | } |
| 773 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 774 | static void __qdio_outbound_processing(struct qdio_q *q) |
| 775 | { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 776 | qperf_inc(q, tasklet_outbound); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 777 | BUG_ON(atomic_read(&q->nr_buf_used) < 0); |
| 778 | |
| 779 | if (qdio_outbound_q_moved(q)) |
Jan Glauber | 9c8a08d | 2009-03-26 15:24:32 +0100 | [diff] [blame] | 780 | qdio_kick_handler(q); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 781 | |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 782 | if (queue_type(q) == QDIO_ZFCP_QFMT) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 783 | if (!pci_out_supported(q) && !qdio_outbound_q_done(q)) |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 784 | goto sched; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 785 | |
| 786 | /* bail out for HiperSockets unicast queues */ |
| 787 | if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) |
| 788 | return; |
| 789 | |
Ursula Braun | 4bcb3a3 | 2008-10-10 21:33:04 +0200 | [diff] [blame] | 790 | if ((queue_type(q) == QDIO_IQDIO_QFMT) && |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 791 | (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) |
| 792 | goto sched; |
Ursula Braun | 4bcb3a3 | 2008-10-10 21:33:04 +0200 | [diff] [blame] | 793 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 794 | if (q->u.out.pci_out_enabled) |
| 795 | return; |
| 796 | |
| 797 | /* |
| 798 | * Now we know that queue type is either qeth without pci enabled |
| 799 | * or HiperSockets multicast. Make sure buffer switch from PRIMED to |
| 800 | * EMPTY is noticed and outbound_handler is called after some time. |
| 801 | */ |
| 802 | if (qdio_outbound_q_done(q)) |
| 803 | del_timer(&q->u.out.timer); |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 804 | else |
| 805 | if (!timer_pending(&q->u.out.timer)) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 806 | mod_timer(&q->u.out.timer, jiffies + 10 * HZ); |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 807 | return; |
| 808 | |
| 809 | sched: |
| 810 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
| 811 | return; |
| 812 | tasklet_schedule(&q->tasklet); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 813 | } |
| 814 | |
| 815 | /* outbound tasklet */ |
| 816 | void qdio_outbound_processing(unsigned long data) |
| 817 | { |
| 818 | struct qdio_q *q = (struct qdio_q *)data; |
| 819 | __qdio_outbound_processing(q); |
| 820 | } |
| 821 | |
| 822 | void qdio_outbound_timer(unsigned long data) |
| 823 | { |
| 824 | struct qdio_q *q = (struct qdio_q *)data; |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 825 | |
| 826 | if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
| 827 | return; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 828 | tasklet_schedule(&q->tasklet); |
| 829 | } |
| 830 | |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 831 | static inline void qdio_check_outbound_after_thinint(struct qdio_q *q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 832 | { |
| 833 | struct qdio_q *out; |
| 834 | int i; |
| 835 | |
| 836 | if (!pci_out_supported(q)) |
| 837 | return; |
| 838 | |
| 839 | for_each_output_queue(q->irq_ptr, out, i) |
| 840 | if (!qdio_outbound_q_done(out)) |
| 841 | tasklet_schedule(&out->tasklet); |
| 842 | } |
| 843 | |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 844 | static void __tiqdio_inbound_processing(struct qdio_q *q) |
| 845 | { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 846 | qperf_inc(q, tasklet_inbound); |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 847 | if (need_siga_sync(q) && need_siga_sync_after_ai(q)) |
| 848 | qdio_sync_queues(q); |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 849 | |
| 850 | /* |
| 851 | * The interrupt could be caused by a PCI request. Check the |
| 852 | * PCI capable outbound queues. |
| 853 | */ |
| 854 | qdio_check_outbound_after_thinint(q); |
| 855 | |
| 856 | if (!qdio_inbound_q_moved(q)) |
| 857 | return; |
| 858 | |
| 859 | qdio_kick_handler(q); |
| 860 | |
Jan Glauber | 9a2c160 | 2009-06-22 12:08:11 +0200 | [diff] [blame] | 861 | if (!qdio_inbound_q_done(q)) { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 862 | qperf_inc(q, tasklet_inbound_resched); |
Jan Glauber | e2910bc | 2009-09-11 10:28:19 +0200 | [diff] [blame] | 863 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) { |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 864 | tasklet_schedule(&q->tasklet); |
Jan Glauber | e2910bc | 2009-09-11 10:28:19 +0200 | [diff] [blame] | 865 | return; |
| 866 | } |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 867 | } |
| 868 | |
| 869 | qdio_stop_polling(q); |
| 870 | /* |
| 871 | * We need to check again to not lose initiative after |
| 872 | * resetting the ACK state. |
| 873 | */ |
Jan Glauber | 9a2c160 | 2009-06-22 12:08:11 +0200 | [diff] [blame] | 874 | if (!qdio_inbound_q_done(q)) { |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 875 | qperf_inc(q, tasklet_inbound_resched2); |
Jan Glauber | 60b5df2 | 2009-06-22 12:08:10 +0200 | [diff] [blame] | 876 | if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) |
| 877 | tasklet_schedule(&q->tasklet); |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | void tiqdio_inbound_processing(unsigned long data) |
| 882 | { |
| 883 | struct qdio_q *q = (struct qdio_q *)data; |
| 884 | __tiqdio_inbound_processing(q); |
| 885 | } |
| 886 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 887 | static inline void qdio_set_state(struct qdio_irq *irq_ptr, |
| 888 | enum qdio_irq_states state) |
| 889 | { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 890 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 891 | |
| 892 | irq_ptr->state = state; |
| 893 | mb(); |
| 894 | } |
| 895 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 896 | 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] | 897 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 898 | if (irb->esw.esw0.erw.cons) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 899 | DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no); |
| 900 | DBF_ERROR_HEX(irb, 64); |
| 901 | DBF_ERROR_HEX(irb->ecw, 64); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 902 | } |
| 903 | } |
| 904 | |
| 905 | /* PCI interrupt handler */ |
| 906 | static void qdio_int_handler_pci(struct qdio_irq *irq_ptr) |
| 907 | { |
| 908 | int i; |
| 909 | struct qdio_q *q; |
| 910 | |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 911 | if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED)) |
| 912 | return; |
| 913 | |
Jan Glauber | d36deae | 2010-09-07 21:14:39 +0000 | [diff] [blame] | 914 | for_each_input_queue(irq_ptr, q, i) { |
| 915 | if (q->u.in.queue_start_poll) { |
| 916 | /* skip if polling is enabled or already in work */ |
| 917 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, |
| 918 | &q->u.in.queue_irq_state)) { |
| 919 | qperf_inc(q, int_discarded); |
| 920 | continue; |
| 921 | } |
| 922 | q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr, |
| 923 | q->irq_ptr->int_parm); |
| 924 | } else |
| 925 | tasklet_schedule(&q->tasklet); |
| 926 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 927 | |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 928 | if (!pci_out_supported(q)) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 929 | return; |
| 930 | |
| 931 | for_each_output_queue(irq_ptr, q, i) { |
| 932 | if (qdio_outbound_q_done(q)) |
| 933 | continue; |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 934 | if (need_siga_sync(q) && need_siga_sync_out_after_pci(q)) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 935 | qdio_siga_sync_q(q); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 936 | tasklet_schedule(&q->tasklet); |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | static void qdio_handle_activate_check(struct ccw_device *cdev, |
| 941 | unsigned long intparm, int cstat, int dstat) |
| 942 | { |
| 943 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 944 | struct qdio_q *q; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 945 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 946 | DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no); |
| 947 | DBF_ERROR("intp :%lx", intparm); |
| 948 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 949 | |
| 950 | if (irq_ptr->nr_input_qs) { |
| 951 | q = irq_ptr->input_qs[0]; |
| 952 | } else if (irq_ptr->nr_output_qs) { |
| 953 | q = irq_ptr->output_qs[0]; |
| 954 | } else { |
| 955 | dump_stack(); |
| 956 | goto no_handler; |
| 957 | } |
| 958 | q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION, |
| 959 | 0, -1, -1, irq_ptr->int_parm); |
| 960 | no_handler: |
| 961 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); |
| 962 | } |
| 963 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 964 | static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, |
| 965 | int dstat) |
| 966 | { |
| 967 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 968 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 969 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq"); |
Jan Glauber | 4c57542 | 2009-06-12 10:26:28 +0200 | [diff] [blame] | 970 | |
| 971 | if (cstat) |
| 972 | goto error; |
| 973 | if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END)) |
| 974 | goto error; |
| 975 | if (!(dstat & DEV_STAT_DEV_END)) |
| 976 | goto error; |
| 977 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED); |
| 978 | return; |
| 979 | |
| 980 | error: |
| 981 | DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no); |
| 982 | DBF_ERROR("ds: %2x cs:%2x", dstat, cstat); |
| 983 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 984 | } |
| 985 | |
| 986 | /* qdio interrupt handler */ |
| 987 | void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, |
| 988 | struct irb *irb) |
| 989 | { |
| 990 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 991 | int cstat, dstat; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 992 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 993 | if (!intparm || !irq_ptr) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 994 | DBF_ERROR("qint:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 995 | return; |
| 996 | } |
| 997 | |
Jan Glauber | 30d77c3 | 2011-01-05 12:47:29 +0100 | [diff] [blame] | 998 | kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++; |
Jan Glauber | 09a308f | 2010-05-17 10:00:14 +0200 | [diff] [blame] | 999 | if (irq_ptr->perf_stat_enabled) |
| 1000 | irq_ptr->perf_stat.qdio_int++; |
| 1001 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1002 | if (IS_ERR(irb)) { |
| 1003 | switch (PTR_ERR(irb)) { |
| 1004 | case -EIO: |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1005 | DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no); |
Jan Glauber | 75cb71f | 2009-04-14 15:36:22 +0200 | [diff] [blame] | 1006 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR); |
| 1007 | wake_up(&cdev->private->wait_q); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1008 | return; |
| 1009 | default: |
| 1010 | WARN_ON(1); |
| 1011 | return; |
| 1012 | } |
| 1013 | } |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1014 | qdio_irq_check_sense(irq_ptr, irb); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1015 | cstat = irb->scsw.cmd.cstat; |
| 1016 | dstat = irb->scsw.cmd.dstat; |
| 1017 | |
| 1018 | switch (irq_ptr->state) { |
| 1019 | case QDIO_IRQ_STATE_INACTIVE: |
| 1020 | qdio_establish_handle_irq(cdev, cstat, dstat); |
| 1021 | break; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1022 | case QDIO_IRQ_STATE_CLEANUP: |
| 1023 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); |
| 1024 | break; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1025 | case QDIO_IRQ_STATE_ESTABLISHED: |
| 1026 | case QDIO_IRQ_STATE_ACTIVE: |
| 1027 | if (cstat & SCHN_STAT_PCI) { |
| 1028 | qdio_int_handler_pci(irq_ptr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1029 | return; |
| 1030 | } |
Jan Glauber | 4c57542 | 2009-06-12 10:26:28 +0200 | [diff] [blame] | 1031 | if (cstat || dstat) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1032 | qdio_handle_activate_check(cdev, intparm, cstat, |
| 1033 | dstat); |
Jan Glauber | 4c57542 | 2009-06-12 10:26:28 +0200 | [diff] [blame] | 1034 | break; |
Jan Glauber | 959153d | 2010-02-09 09:46:08 +0100 | [diff] [blame] | 1035 | case QDIO_IRQ_STATE_STOPPED: |
| 1036 | break; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1037 | default: |
| 1038 | WARN_ON(1); |
| 1039 | } |
| 1040 | wake_up(&cdev->private->wait_q); |
| 1041 | } |
| 1042 | |
| 1043 | /** |
| 1044 | * qdio_get_ssqd_desc - get qdio subchannel description |
| 1045 | * @cdev: ccw device to get description for |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1046 | * @data: where to store the ssqd |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1047 | * |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1048 | * Returns 0 or an error code. The results of the chsc are stored in the |
| 1049 | * specified structure. |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1050 | */ |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1051 | int qdio_get_ssqd_desc(struct ccw_device *cdev, |
| 1052 | struct qdio_ssqd_desc *data) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1053 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1054 | |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1055 | if (!cdev || !cdev->private) |
| 1056 | return -EINVAL; |
| 1057 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1058 | DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no); |
Jan Glauber | bbd50e1 | 2008-12-25 13:38:43 +0100 | [diff] [blame] | 1059 | return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1060 | } |
| 1061 | EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc); |
| 1062 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1063 | static void qdio_shutdown_queues(struct ccw_device *cdev) |
| 1064 | { |
| 1065 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 1066 | struct qdio_q *q; |
| 1067 | int i; |
| 1068 | |
| 1069 | for_each_input_queue(irq_ptr, q, i) |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 1070 | tasklet_kill(&q->tasklet); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1071 | |
| 1072 | for_each_output_queue(irq_ptr, q, i) { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1073 | del_timer(&q->u.out.timer); |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 1074 | tasklet_kill(&q->tasklet); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | /** |
| 1079 | * qdio_shutdown - shut down a qdio subchannel |
| 1080 | * @cdev: associated ccw device |
| 1081 | * @how: use halt or clear to shutdown |
| 1082 | */ |
| 1083 | int qdio_shutdown(struct ccw_device *cdev, int how) |
| 1084 | { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1085 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1086 | int rc; |
| 1087 | unsigned long flags; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1088 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1089 | if (!irq_ptr) |
| 1090 | return -ENODEV; |
| 1091 | |
Jan Glauber | b454740 | 2009-03-26 15:24:24 +0100 | [diff] [blame] | 1092 | BUG_ON(irqs_disabled()); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1093 | DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no); |
| 1094 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1095 | mutex_lock(&irq_ptr->setup_mutex); |
| 1096 | /* |
| 1097 | * Subchannel was already shot down. We cannot prevent being called |
| 1098 | * twice since cio may trigger a shutdown asynchronously. |
| 1099 | */ |
| 1100 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { |
| 1101 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1102 | return 0; |
| 1103 | } |
| 1104 | |
Jan Glauber | c38f960 | 2009-03-26 15:24:26 +0100 | [diff] [blame] | 1105 | /* |
| 1106 | * Indicate that the device is going down. Scheduling the queue |
| 1107 | * tasklets is forbidden from here on. |
| 1108 | */ |
| 1109 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); |
| 1110 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1111 | tiqdio_remove_input_queues(irq_ptr); |
| 1112 | qdio_shutdown_queues(cdev); |
| 1113 | qdio_shutdown_debug_entries(irq_ptr, cdev); |
| 1114 | |
| 1115 | /* cleanup subchannel */ |
| 1116 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 1117 | |
| 1118 | if (how & QDIO_FLAG_CLEANUP_USING_CLEAR) |
| 1119 | rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP); |
| 1120 | else |
| 1121 | /* default behaviour is halt */ |
| 1122 | rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP); |
| 1123 | if (rc) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1124 | DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no); |
| 1125 | DBF_ERROR("rc:%4d", rc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1126 | goto no_cleanup; |
| 1127 | } |
| 1128 | |
| 1129 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP); |
| 1130 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1131 | wait_event_interruptible_timeout(cdev->private->wait_q, |
| 1132 | irq_ptr->state == QDIO_IRQ_STATE_INACTIVE || |
| 1133 | irq_ptr->state == QDIO_IRQ_STATE_ERR, |
| 1134 | 10 * HZ); |
| 1135 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); |
| 1136 | |
| 1137 | no_cleanup: |
| 1138 | qdio_shutdown_thinint(irq_ptr); |
| 1139 | |
| 1140 | /* restore interrupt handler */ |
| 1141 | if ((void *)cdev->handler == (void *)qdio_int_handler) |
| 1142 | cdev->handler = irq_ptr->orig_handler; |
| 1143 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); |
| 1144 | |
| 1145 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); |
| 1146 | mutex_unlock(&irq_ptr->setup_mutex); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1147 | if (rc) |
| 1148 | return rc; |
| 1149 | return 0; |
| 1150 | } |
| 1151 | EXPORT_SYMBOL_GPL(qdio_shutdown); |
| 1152 | |
| 1153 | /** |
| 1154 | * qdio_free - free data structures for a qdio subchannel |
| 1155 | * @cdev: associated ccw device |
| 1156 | */ |
| 1157 | int qdio_free(struct ccw_device *cdev) |
| 1158 | { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1159 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1160 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1161 | if (!irq_ptr) |
| 1162 | return -ENODEV; |
| 1163 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1164 | DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1165 | mutex_lock(&irq_ptr->setup_mutex); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1166 | |
| 1167 | if (irq_ptr->debug_area != NULL) { |
| 1168 | debug_unregister(irq_ptr->debug_area); |
| 1169 | irq_ptr->debug_area = NULL; |
| 1170 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1171 | cdev->private->qdio_data = NULL; |
| 1172 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1173 | |
| 1174 | qdio_release_memory(irq_ptr); |
| 1175 | return 0; |
| 1176 | } |
| 1177 | EXPORT_SYMBOL_GPL(qdio_free); |
| 1178 | |
| 1179 | /** |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1180 | * qdio_allocate - allocate qdio queues and associated data |
| 1181 | * @init_data: initialization data |
| 1182 | */ |
| 1183 | int qdio_allocate(struct qdio_initialize *init_data) |
| 1184 | { |
| 1185 | struct qdio_irq *irq_ptr; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1186 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1187 | DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1188 | |
| 1189 | if ((init_data->no_input_qs && !init_data->input_handler) || |
| 1190 | (init_data->no_output_qs && !init_data->output_handler)) |
| 1191 | return -EINVAL; |
| 1192 | |
| 1193 | if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) || |
| 1194 | (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)) |
| 1195 | return -EINVAL; |
| 1196 | |
| 1197 | if ((!init_data->input_sbal_addr_array) || |
| 1198 | (!init_data->output_sbal_addr_array)) |
| 1199 | return -EINVAL; |
| 1200 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1201 | /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */ |
| 1202 | irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| 1203 | if (!irq_ptr) |
| 1204 | goto out_err; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1205 | |
| 1206 | mutex_init(&irq_ptr->setup_mutex); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1207 | qdio_allocate_dbf(init_data, irq_ptr); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1208 | |
| 1209 | /* |
| 1210 | * Allocate a page for the chsc calls in qdio_establish. |
| 1211 | * Must be pre-allocated since a zfcp recovery will call |
| 1212 | * qdio_establish. In case of low memory and swap on a zfcp disk |
| 1213 | * we may not be able to allocate memory otherwise. |
| 1214 | */ |
| 1215 | irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL); |
| 1216 | if (!irq_ptr->chsc_page) |
| 1217 | goto out_rel; |
| 1218 | |
| 1219 | /* qdr is used in ccw1.cda which is u32 */ |
Jan Glauber | 3b8e300 | 2008-08-01 16:39:17 +0200 | [diff] [blame] | 1220 | irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1221 | if (!irq_ptr->qdr) |
| 1222 | goto out_rel; |
| 1223 | WARN_ON((unsigned long)irq_ptr->qdr & 0xfff); |
| 1224 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1225 | if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs, |
| 1226 | init_data->no_output_qs)) |
| 1227 | goto out_rel; |
| 1228 | |
| 1229 | init_data->cdev->private->qdio_data = irq_ptr; |
| 1230 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE); |
| 1231 | return 0; |
| 1232 | out_rel: |
| 1233 | qdio_release_memory(irq_ptr); |
| 1234 | out_err: |
| 1235 | return -ENOMEM; |
| 1236 | } |
| 1237 | EXPORT_SYMBOL_GPL(qdio_allocate); |
| 1238 | |
| 1239 | /** |
| 1240 | * qdio_establish - establish queues on a qdio subchannel |
| 1241 | * @init_data: initialization data |
| 1242 | */ |
| 1243 | int qdio_establish(struct qdio_initialize *init_data) |
| 1244 | { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1245 | struct qdio_irq *irq_ptr; |
| 1246 | struct ccw_device *cdev = init_data->cdev; |
| 1247 | unsigned long saveflags; |
| 1248 | int rc; |
| 1249 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1250 | DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 58eb27c | 2008-08-21 19:46:34 +0200 | [diff] [blame] | 1251 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1252 | irq_ptr = cdev->private->qdio_data; |
| 1253 | if (!irq_ptr) |
| 1254 | return -ENODEV; |
| 1255 | |
| 1256 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 1257 | return -EINVAL; |
| 1258 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1259 | mutex_lock(&irq_ptr->setup_mutex); |
| 1260 | qdio_setup_irq(init_data); |
| 1261 | |
| 1262 | rc = qdio_establish_thinint(irq_ptr); |
| 1263 | if (rc) { |
| 1264 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1265 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 1266 | return rc; |
| 1267 | } |
| 1268 | |
| 1269 | /* establish q */ |
| 1270 | irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd; |
| 1271 | irq_ptr->ccw.flags = CCW_FLAG_SLI; |
| 1272 | irq_ptr->ccw.count = irq_ptr->equeue.count; |
| 1273 | irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr); |
| 1274 | |
| 1275 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); |
| 1276 | ccw_device_set_options_mask(cdev, 0); |
| 1277 | |
| 1278 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0); |
| 1279 | if (rc) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1280 | DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no); |
| 1281 | DBF_ERROR("rc:%4x", rc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1282 | } |
| 1283 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); |
| 1284 | |
| 1285 | if (rc) { |
| 1286 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1287 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 1288 | return rc; |
| 1289 | } |
| 1290 | |
| 1291 | wait_event_interruptible_timeout(cdev->private->wait_q, |
| 1292 | irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED || |
| 1293 | irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ); |
| 1294 | |
| 1295 | if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) { |
| 1296 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1297 | qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR); |
| 1298 | return -EIO; |
| 1299 | } |
| 1300 | |
| 1301 | qdio_setup_ssqd_info(irq_ptr); |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1302 | DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1303 | |
| 1304 | /* qebsm is now setup if available, initialize buffer states */ |
| 1305 | qdio_init_buf_states(irq_ptr); |
| 1306 | |
| 1307 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1308 | qdio_print_subchannel_info(irq_ptr, cdev); |
| 1309 | qdio_setup_debug_entries(irq_ptr, cdev); |
| 1310 | return 0; |
| 1311 | } |
| 1312 | EXPORT_SYMBOL_GPL(qdio_establish); |
| 1313 | |
| 1314 | /** |
| 1315 | * qdio_activate - activate queues on a qdio subchannel |
| 1316 | * @cdev: associated cdev |
| 1317 | */ |
| 1318 | int qdio_activate(struct ccw_device *cdev) |
| 1319 | { |
| 1320 | struct qdio_irq *irq_ptr; |
| 1321 | int rc; |
| 1322 | unsigned long saveflags; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1323 | |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1324 | DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no); |
Jan Glauber | 58eb27c | 2008-08-21 19:46:34 +0200 | [diff] [blame] | 1325 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1326 | irq_ptr = cdev->private->qdio_data; |
| 1327 | if (!irq_ptr) |
| 1328 | return -ENODEV; |
| 1329 | |
| 1330 | if (cdev->private->state != DEV_STATE_ONLINE) |
| 1331 | return -EINVAL; |
| 1332 | |
| 1333 | mutex_lock(&irq_ptr->setup_mutex); |
| 1334 | if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) { |
| 1335 | rc = -EBUSY; |
| 1336 | goto out; |
| 1337 | } |
| 1338 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1339 | irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd; |
| 1340 | irq_ptr->ccw.flags = CCW_FLAG_SLI; |
| 1341 | irq_ptr->ccw.count = irq_ptr->aqueue.count; |
| 1342 | irq_ptr->ccw.cda = 0; |
| 1343 | |
| 1344 | spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags); |
| 1345 | ccw_device_set_options(cdev, CCWDEV_REPORT_ALL); |
| 1346 | |
| 1347 | rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE, |
| 1348 | 0, DOIO_DENY_PREFETCH); |
| 1349 | if (rc) { |
Jan Glauber | 22f9934 | 2008-12-25 13:38:46 +0100 | [diff] [blame] | 1350 | DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no); |
| 1351 | DBF_ERROR("rc:%4x", rc); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1352 | } |
| 1353 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags); |
| 1354 | |
| 1355 | if (rc) |
| 1356 | goto out; |
| 1357 | |
| 1358 | if (is_thinint_irq(irq_ptr)) |
| 1359 | tiqdio_add_input_queues(irq_ptr); |
| 1360 | |
| 1361 | /* wait for subchannel to become active */ |
| 1362 | msleep(5); |
| 1363 | |
| 1364 | switch (irq_ptr->state) { |
| 1365 | case QDIO_IRQ_STATE_STOPPED: |
| 1366 | case QDIO_IRQ_STATE_ERR: |
Jan Glauber | e4c14e2 | 2009-03-26 15:24:25 +0100 | [diff] [blame] | 1367 | rc = -EIO; |
| 1368 | break; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1369 | default: |
| 1370 | qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE); |
| 1371 | rc = 0; |
| 1372 | } |
| 1373 | out: |
| 1374 | mutex_unlock(&irq_ptr->setup_mutex); |
| 1375 | return rc; |
| 1376 | } |
| 1377 | EXPORT_SYMBOL_GPL(qdio_activate); |
| 1378 | |
| 1379 | static inline int buf_in_between(int bufnr, int start, int count) |
| 1380 | { |
| 1381 | int end = add_buf(start, count); |
| 1382 | |
| 1383 | if (end > start) { |
| 1384 | if (bufnr >= start && bufnr < end) |
| 1385 | return 1; |
| 1386 | else |
| 1387 | return 0; |
| 1388 | } |
| 1389 | |
| 1390 | /* wrap-around case */ |
| 1391 | if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) || |
| 1392 | (bufnr < end)) |
| 1393 | return 1; |
| 1394 | else |
| 1395 | return 0; |
| 1396 | } |
| 1397 | |
| 1398 | /** |
| 1399 | * handle_inbound - reset processed input buffers |
| 1400 | * @q: queue containing the buffers |
| 1401 | * @callflags: flags |
| 1402 | * @bufnr: first buffer to process |
| 1403 | * @count: how many buffers are emptied |
| 1404 | */ |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1405 | static int handle_inbound(struct qdio_q *q, unsigned int callflags, |
| 1406 | int bufnr, int count) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1407 | { |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1408 | int used, diff; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1409 | |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 1410 | qperf_inc(q, inbound_call); |
| 1411 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1412 | if (!q->u.in.polling) |
| 1413 | goto set; |
| 1414 | |
| 1415 | /* protect against stop polling setting an ACK for an emptied slsb */ |
| 1416 | if (count == QDIO_MAX_BUFFERS_PER_Q) { |
| 1417 | /* overwriting everything, just delete polling status */ |
| 1418 | q->u.in.polling = 0; |
| 1419 | q->u.in.ack_count = 0; |
| 1420 | goto set; |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 1421 | } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) { |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1422 | if (is_qebsm(q)) { |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 1423 | /* partial overwrite, just update ack_start */ |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1424 | diff = add_buf(bufnr, count); |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 1425 | diff = sub_buf(diff, q->u.in.ack_start); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1426 | q->u.in.ack_count -= diff; |
| 1427 | if (q->u.in.ack_count <= 0) { |
| 1428 | q->u.in.polling = 0; |
| 1429 | q->u.in.ack_count = 0; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1430 | goto set; |
| 1431 | } |
Jan Glauber | e85dea0 | 2009-03-26 15:24:29 +0100 | [diff] [blame] | 1432 | q->u.in.ack_start = add_buf(q->u.in.ack_start, diff); |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1433 | } |
| 1434 | else |
| 1435 | /* the only ACK will be deleted, so stop polling */ |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1436 | q->u.in.polling = 0; |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1437 | } |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1438 | |
Jan Glauber | 50f769d | 2008-12-25 13:38:47 +0100 | [diff] [blame] | 1439 | set: |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1440 | count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1441 | |
| 1442 | used = atomic_add_return(count, &q->nr_buf_used) - count; |
| 1443 | BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q); |
| 1444 | |
| 1445 | /* no need to signal as long as the adapter had free buffers */ |
| 1446 | if (used) |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1447 | return 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1448 | |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1449 | if (need_siga_in(q)) |
| 1450 | return qdio_siga_input(q); |
| 1451 | return 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1452 | } |
| 1453 | |
| 1454 | /** |
| 1455 | * handle_outbound - process filled outbound buffers |
| 1456 | * @q: queue containing the buffers |
| 1457 | * @callflags: flags |
| 1458 | * @bufnr: first buffer to process |
| 1459 | * @count: how many buffers are filled |
| 1460 | */ |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1461 | static int handle_outbound(struct qdio_q *q, unsigned int callflags, |
| 1462 | int bufnr, int count) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1463 | { |
Jan Glauber | c26001d | 2011-05-23 10:24:38 +0200 | [diff] [blame] | 1464 | unsigned char state = 0; |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1465 | int used, rc = 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1466 | |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 1467 | qperf_inc(q, outbound_call); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1468 | |
| 1469 | count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count); |
| 1470 | used = atomic_add_return(count, &q->nr_buf_used); |
| 1471 | BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q); |
| 1472 | |
Jan Glauber | 0195843 | 2011-01-05 12:47:51 +0100 | [diff] [blame] | 1473 | if (used == QDIO_MAX_BUFFERS_PER_Q) |
| 1474 | qperf_inc(q, outbound_queue_full); |
| 1475 | |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 1476 | if (callflags & QDIO_FLAG_PCI_OUT) { |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1477 | q->u.out.pci_out_enabled = 1; |
Jan Glauber | 6486cda | 2010-01-04 09:05:42 +0100 | [diff] [blame] | 1478 | qperf_inc(q, pci_request_int); |
Jan Glauber | 110da31 | 2011-01-05 12:47:53 +0100 | [diff] [blame] | 1479 | } else |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1480 | q->u.out.pci_out_enabled = 0; |
| 1481 | |
| 1482 | if (queue_type(q) == QDIO_IQDIO_QFMT) { |
Jan Glauber | 110da31 | 2011-01-05 12:47:53 +0100 | [diff] [blame] | 1483 | /* One SIGA-W per buffer required for unicast HiperSockets. */ |
| 1484 | WARN_ON_ONCE(count > 1 && !multicast_outbound(q)); |
| 1485 | |
| 1486 | rc = qdio_kick_outbound_q(q); |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 1487 | } else if (need_siga_sync(q)) { |
Jan Glauber | 110da31 | 2011-01-05 12:47:53 +0100 | [diff] [blame] | 1488 | rc = qdio_siga_sync_q(q); |
| 1489 | } else { |
| 1490 | /* try to fast requeue buffers */ |
| 1491 | get_buf_state(q, prev_buf(bufnr), &state, 0); |
| 1492 | if (state != SLSB_CU_OUTPUT_PRIMED) |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1493 | rc = qdio_kick_outbound_q(q); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1494 | else |
Jan Glauber | 110da31 | 2011-01-05 12:47:53 +0100 | [diff] [blame] | 1495 | qperf_inc(q, fast_requeue); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1496 | } |
| 1497 | |
Jan Glauber | 3d6c76f | 2011-01-05 12:47:50 +0100 | [diff] [blame] | 1498 | /* in case of SIGA errors we must process the error immediately */ |
| 1499 | if (used >= q->u.out.scan_threshold || rc) |
| 1500 | tasklet_schedule(&q->tasklet); |
| 1501 | else |
| 1502 | /* free the SBALs in case of no further traffic */ |
| 1503 | if (!timer_pending(&q->u.out.timer)) |
| 1504 | mod_timer(&q->u.out.timer, jiffies + HZ); |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1505 | return rc; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1506 | } |
| 1507 | |
| 1508 | /** |
| 1509 | * do_QDIO - process input or output buffers |
| 1510 | * @cdev: associated ccw_device for the qdio subchannel |
| 1511 | * @callflags: input or output and special flags from the program |
| 1512 | * @q_nr: queue number |
| 1513 | * @bufnr: buffer number |
| 1514 | * @count: how many buffers to process |
| 1515 | */ |
| 1516 | int do_QDIO(struct ccw_device *cdev, unsigned int callflags, |
Jan Glauber | 6618241 | 2009-06-22 12:08:15 +0200 | [diff] [blame] | 1517 | int q_nr, unsigned int bufnr, unsigned int count) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1518 | { |
| 1519 | struct qdio_irq *irq_ptr; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1520 | |
Jan Glauber | 6618241 | 2009-06-22 12:08:15 +0200 | [diff] [blame] | 1521 | if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q) |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1522 | return -EINVAL; |
| 1523 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1524 | irq_ptr = cdev->private->qdio_data; |
| 1525 | if (!irq_ptr) |
| 1526 | return -ENODEV; |
| 1527 | |
Jan Glauber | 1d7e150 | 2009-09-22 22:58:39 +0200 | [diff] [blame] | 1528 | DBF_DEV_EVENT(DBF_INFO, irq_ptr, |
| 1529 | "do%02x b:%02x c:%02x", callflags, bufnr, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1530 | |
| 1531 | if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE) |
| 1532 | return -EBUSY; |
Jan Glauber | 9a26513 | 2011-03-23 10:16:01 +0100 | [diff] [blame] | 1533 | if (!count) |
| 1534 | return 0; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1535 | if (callflags & QDIO_FLAG_SYNC_INPUT) |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1536 | return handle_inbound(irq_ptr->input_qs[q_nr], |
| 1537 | callflags, bufnr, count); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1538 | else if (callflags & QDIO_FLAG_SYNC_OUTPUT) |
Jan Glauber | d303b6f | 2009-03-26 15:24:31 +0100 | [diff] [blame] | 1539 | return handle_outbound(irq_ptr->output_qs[q_nr], |
| 1540 | callflags, bufnr, count); |
| 1541 | return -EINVAL; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1542 | } |
| 1543 | EXPORT_SYMBOL_GPL(do_QDIO); |
| 1544 | |
Jan Glauber | d36deae | 2010-09-07 21:14:39 +0000 | [diff] [blame] | 1545 | /** |
| 1546 | * qdio_start_irq - process input buffers |
| 1547 | * @cdev: associated ccw_device for the qdio subchannel |
| 1548 | * @nr: input queue number |
| 1549 | * |
| 1550 | * Return codes |
| 1551 | * 0 - success |
| 1552 | * 1 - irqs not started since new data is available |
| 1553 | */ |
| 1554 | int qdio_start_irq(struct ccw_device *cdev, int nr) |
| 1555 | { |
| 1556 | struct qdio_q *q; |
| 1557 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 1558 | |
| 1559 | if (!irq_ptr) |
| 1560 | return -ENODEV; |
| 1561 | q = irq_ptr->input_qs[nr]; |
| 1562 | |
| 1563 | WARN_ON(queue_irqs_enabled(q)); |
| 1564 | |
Jan Glauber | 4f32518 | 2011-01-05 12:47:49 +0100 | [diff] [blame] | 1565 | if (!shared_ind(q->irq_ptr->dsci)) |
Jan Glauber | d36deae | 2010-09-07 21:14:39 +0000 | [diff] [blame] | 1566 | xchg(q->irq_ptr->dsci, 0); |
| 1567 | |
| 1568 | qdio_stop_polling(q); |
| 1569 | clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state); |
| 1570 | |
| 1571 | /* |
| 1572 | * We need to check again to not lose initiative after |
| 1573 | * resetting the ACK state. |
| 1574 | */ |
Jan Glauber | 4f32518 | 2011-01-05 12:47:49 +0100 | [diff] [blame] | 1575 | if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci) |
Jan Glauber | d36deae | 2010-09-07 21:14:39 +0000 | [diff] [blame] | 1576 | goto rescan; |
| 1577 | if (!qdio_inbound_q_done(q)) |
| 1578 | goto rescan; |
| 1579 | return 0; |
| 1580 | |
| 1581 | rescan: |
| 1582 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, |
| 1583 | &q->u.in.queue_irq_state)) |
| 1584 | return 0; |
| 1585 | else |
| 1586 | return 1; |
| 1587 | |
| 1588 | } |
| 1589 | EXPORT_SYMBOL(qdio_start_irq); |
| 1590 | |
| 1591 | /** |
| 1592 | * qdio_get_next_buffers - process input buffers |
| 1593 | * @cdev: associated ccw_device for the qdio subchannel |
| 1594 | * @nr: input queue number |
| 1595 | * @bufnr: first filled buffer number |
| 1596 | * @error: buffers are in error state |
| 1597 | * |
| 1598 | * Return codes |
| 1599 | * < 0 - error |
| 1600 | * = 0 - no new buffers found |
| 1601 | * > 0 - number of processed buffers |
| 1602 | */ |
| 1603 | int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, |
| 1604 | int *error) |
| 1605 | { |
| 1606 | struct qdio_q *q; |
| 1607 | int start, end; |
| 1608 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 1609 | |
| 1610 | if (!irq_ptr) |
| 1611 | return -ENODEV; |
| 1612 | q = irq_ptr->input_qs[nr]; |
| 1613 | WARN_ON(queue_irqs_enabled(q)); |
| 1614 | |
Jan Glauber | d36deae | 2010-09-07 21:14:39 +0000 | [diff] [blame] | 1615 | /* |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 1616 | * Cannot rely on automatic sync after interrupt since queues may |
| 1617 | * also be examined without interrupt. |
Jan Glauber | d36deae | 2010-09-07 21:14:39 +0000 | [diff] [blame] | 1618 | */ |
Jan Glauber | 90adac5 | 2011-01-05 12:47:54 +0100 | [diff] [blame] | 1619 | if (need_siga_sync(q)) |
| 1620 | qdio_sync_queues(q); |
| 1621 | |
| 1622 | /* check the PCI capable outbound queues. */ |
Jan Glauber | d36deae | 2010-09-07 21:14:39 +0000 | [diff] [blame] | 1623 | qdio_check_outbound_after_thinint(q); |
| 1624 | |
| 1625 | if (!qdio_inbound_q_moved(q)) |
| 1626 | return 0; |
| 1627 | |
| 1628 | /* Note: upper-layer MUST stop processing immediately here ... */ |
| 1629 | if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)) |
| 1630 | return -EIO; |
| 1631 | |
| 1632 | start = q->first_to_kick; |
| 1633 | end = q->first_to_check; |
| 1634 | *bufnr = start; |
| 1635 | *error = q->qdio_error; |
| 1636 | |
| 1637 | /* for the next time */ |
| 1638 | q->first_to_kick = end; |
| 1639 | q->qdio_error = 0; |
| 1640 | return sub_buf(end, start); |
| 1641 | } |
| 1642 | EXPORT_SYMBOL(qdio_get_next_buffers); |
| 1643 | |
| 1644 | /** |
| 1645 | * qdio_stop_irq - disable interrupt processing for the device |
| 1646 | * @cdev: associated ccw_device for the qdio subchannel |
| 1647 | * @nr: input queue number |
| 1648 | * |
| 1649 | * Return codes |
| 1650 | * 0 - interrupts were already disabled |
| 1651 | * 1 - interrupts successfully disabled |
| 1652 | */ |
| 1653 | int qdio_stop_irq(struct ccw_device *cdev, int nr) |
| 1654 | { |
| 1655 | struct qdio_q *q; |
| 1656 | struct qdio_irq *irq_ptr = cdev->private->qdio_data; |
| 1657 | |
| 1658 | if (!irq_ptr) |
| 1659 | return -ENODEV; |
| 1660 | q = irq_ptr->input_qs[nr]; |
| 1661 | |
| 1662 | if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED, |
| 1663 | &q->u.in.queue_irq_state)) |
| 1664 | return 0; |
| 1665 | else |
| 1666 | return 1; |
| 1667 | } |
| 1668 | EXPORT_SYMBOL(qdio_stop_irq); |
| 1669 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1670 | static int __init init_QDIO(void) |
| 1671 | { |
| 1672 | int rc; |
| 1673 | |
Sebastian Ott | aa5c8df | 2011-04-04 09:43:31 +0200 | [diff] [blame] | 1674 | rc = qdio_debug_init(); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1675 | if (rc) |
| 1676 | return rc; |
Sebastian Ott | aa5c8df | 2011-04-04 09:43:31 +0200 | [diff] [blame] | 1677 | rc = qdio_setup_init(); |
| 1678 | if (rc) |
| 1679 | goto out_debug; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1680 | rc = tiqdio_allocate_memory(); |
| 1681 | if (rc) |
| 1682 | goto out_cache; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1683 | rc = tiqdio_register_thinints(); |
| 1684 | if (rc) |
Sebastian Ott | aa5c8df | 2011-04-04 09:43:31 +0200 | [diff] [blame] | 1685 | goto out_ti; |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1686 | return 0; |
| 1687 | |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1688 | out_ti: |
| 1689 | tiqdio_free_memory(); |
| 1690 | out_cache: |
| 1691 | qdio_setup_exit(); |
Sebastian Ott | aa5c8df | 2011-04-04 09:43:31 +0200 | [diff] [blame] | 1692 | out_debug: |
| 1693 | qdio_debug_exit(); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1694 | return rc; |
| 1695 | } |
| 1696 | |
| 1697 | static void __exit exit_QDIO(void) |
| 1698 | { |
| 1699 | tiqdio_unregister_thinints(); |
| 1700 | tiqdio_free_memory(); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1701 | qdio_setup_exit(); |
Sebastian Ott | aa5c8df | 2011-04-04 09:43:31 +0200 | [diff] [blame] | 1702 | qdio_debug_exit(); |
Jan Glauber | 779e6e1 | 2008-07-17 17:16:48 +0200 | [diff] [blame] | 1703 | } |
| 1704 | |
| 1705 | module_init(init_QDIO); |
| 1706 | module_exit(exit_QDIO); |