1 // SPDX-License-Identifier: GPL-2.0
3 * qdio queue initialization
5 * Copyright IBM Corp. 2008
6 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
8 #include <linux/kernel.h>
9 #include <linux/slab.h>
10 #include <linux/export.h>
20 #include "qdio_debug.h"
22 #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
24 static struct kmem_cache *qdio_q_cache;
25 static struct kmem_cache *qdio_aob_cache;
27 struct qaob *qdio_allocate_aob(void)
29 return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
32 void qdio_release_aob(struct qaob *aob)
34 kmem_cache_free(qdio_aob_cache, aob);
36 EXPORT_SYMBOL_GPL(qdio_release_aob);
39 * qdio_free_buffers() - free qdio buffers
40 * @buf: array of pointers to qdio buffers
41 * @count: number of qdio buffers to free
43 void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
47 for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
48 free_page((unsigned long) buf[pos]);
50 EXPORT_SYMBOL_GPL(qdio_free_buffers);
53 * qdio_alloc_buffers() - allocate qdio buffers
54 * @buf: array of pointers to qdio buffers
55 * @count: number of qdio buffers to allocate
57 int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
61 for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
62 buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
64 qdio_free_buffers(buf, count);
68 for (pos = 0; pos < count; pos++)
69 if (pos % QBUFF_PER_PAGE)
70 buf[pos] = buf[pos - 1] + 1;
73 EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
76 * qdio_reset_buffers() - reset qdio buffers
77 * @buf: array of pointers to qdio buffers
78 * @count: number of qdio buffers that will be zeroed
80 void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
84 for (pos = 0; pos < count; pos++)
85 memset(buf[pos], 0, sizeof(struct qdio_buffer));
87 EXPORT_SYMBOL_GPL(qdio_reset_buffers);
90 * qebsm is only available under 64bit but the adapter sets the feature
91 * flag anyway, so we manually override it.
93 static inline int qebsm_possible(void)
95 return css_general_characteristics.qebsm;
99 * qib_param_field: pointer to 128 bytes or NULL, if no param field
100 * nr_input_qs: pointer to nr_queues*128 words of data or NULL
102 static void set_impl_params(struct qdio_irq *irq_ptr,
103 unsigned int qib_param_field_format,
104 unsigned char *qib_param_field,
105 unsigned long *input_slib_elements,
106 unsigned long *output_slib_elements)
114 irq_ptr->qib.pfmt = qib_param_field_format;
116 memcpy(irq_ptr->qib.parm, qib_param_field,
117 sizeof(irq_ptr->qib.parm));
119 if (!input_slib_elements)
122 for_each_input_queue(irq_ptr, q, i) {
123 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
124 q->slib->slibe[j].parms =
125 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
128 if (!output_slib_elements)
131 for_each_output_queue(irq_ptr, q, i) {
132 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
133 q->slib->slibe[j].parms =
134 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
138 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
143 for (i = 0; i < nr_queues; i++) {
144 q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL);
148 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
150 kmem_cache_free(qdio_q_cache, q);
158 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
162 rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
165 rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
169 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
170 qdio_handler_t *handler, int i)
172 struct slib *slib = q->slib;
174 /* queue must be cleared for qdio_establish */
175 memset(q, 0, sizeof(*q));
176 memset(slib, 0, PAGE_SIZE);
178 q->irq_ptr = irq_ptr;
179 q->mask = 1 << (31 - i);
181 q->handler = handler;
184 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
185 struct qdio_buffer **sbals_array, int i)
190 DBF_HEX(&q, sizeof(void *));
191 q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
194 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
195 q->sbal[j] = *sbals_array++;
199 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
200 : irq_ptr->output_qs[i - 1];
201 prev->slib->nsliba = (unsigned long)q->slib;
204 q->slib->sla = (unsigned long)q->sl;
205 q->slib->slsba = (unsigned long)&q->slsb.val[0];
208 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
209 q->sl->element[j].sbal = virt_to_phys(q->sbal[j]);
212 static void setup_queues(struct qdio_irq *irq_ptr,
213 struct qdio_initialize *qdio_init)
216 struct qdio_buffer **input_sbal_array = qdio_init->input_sbal_addr_array;
217 struct qdio_buffer **output_sbal_array = qdio_init->output_sbal_addr_array;
218 struct qdio_outbuf_state *output_sbal_state_array =
219 qdio_init->output_sbal_state_array;
222 for_each_input_queue(irq_ptr, q, i) {
223 DBF_EVENT("inq:%1d", i);
224 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
228 setup_storage_lists(q, irq_ptr, input_sbal_array, i);
229 input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
231 if (is_thinint_irq(irq_ptr)) {
232 tasklet_init(&q->tasklet, tiqdio_inbound_processing,
235 tasklet_init(&q->tasklet, qdio_inbound_processing,
240 for_each_output_queue(irq_ptr, q, i) {
241 DBF_EVENT("outq:%1d", i);
242 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
244 q->u.out.sbal_state = output_sbal_state_array;
245 output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
248 setup_storage_lists(q, irq_ptr, output_sbal_array, i);
249 output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
251 tasklet_init(&q->tasklet, qdio_outbound_processing,
253 timer_setup(&q->u.out.timer, qdio_outbound_timer, 0);
257 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
259 if (qdioac & AC1_SIGA_INPUT_NEEDED)
260 irq_ptr->siga_flag.input = 1;
261 if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
262 irq_ptr->siga_flag.output = 1;
263 if (qdioac & AC1_SIGA_SYNC_NEEDED)
264 irq_ptr->siga_flag.sync = 1;
265 if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
266 irq_ptr->siga_flag.sync_after_ai = 1;
267 if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
268 irq_ptr->siga_flag.sync_out_after_pci = 1;
271 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
272 unsigned char qdioac, unsigned long token)
274 if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
276 if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
277 (!(qdioac & AC1_SC_QEBSM_ENABLED)))
280 irq_ptr->sch_token = token;
283 DBF_EVENT("%8lx", irq_ptr->sch_token);
287 irq_ptr->sch_token = 0;
288 irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
293 * If there is a qdio_irq we use the chsc_page and store the information
294 * in the qdio_irq, otherwise we copy it to the specified structure.
296 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
297 struct subchannel_id *schid,
298 struct qdio_ssqd_desc *data)
300 struct chsc_ssqd_area *ssqd;
303 DBF_EVENT("getssqd:%4x", schid->sch_no);
305 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
309 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
312 rc = chsc_ssqd(*schid, ssqd);
316 if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
317 !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
318 (ssqd->qdio_ssqd.sch != schid->sch_no))
322 memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
326 free_page((unsigned long)ssqd);
331 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
333 unsigned char qdioac;
336 rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
338 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
339 DBF_ERROR("rc:%x", rc);
340 /* all flags set, worst case */
341 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
342 AC1_SIGA_SYNC_NEEDED;
344 qdioac = irq_ptr->ssqd_desc.qdioac1;
346 check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
347 process_ac_flags(irq_ptr, qdioac);
348 DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
349 DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
352 void qdio_release_memory(struct qdio_irq *irq_ptr)
358 * Must check queue array manually since irq_ptr->nr_input_queues /
359 * irq_ptr->nr_input_queues may not yet be set.
361 for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
362 q = irq_ptr->input_qs[i];
364 free_page((unsigned long) q->slib);
365 kmem_cache_free(qdio_q_cache, q);
368 for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
369 q = irq_ptr->output_qs[i];
371 if (q->u.out.use_cq) {
374 for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
375 struct qaob *aob = q->u.out.aobs[n];
377 qdio_release_aob(aob);
378 q->u.out.aobs[n] = NULL;
382 qdio_disable_async_operation(&q->u.out);
384 free_page((unsigned long) q->slib);
385 kmem_cache_free(qdio_q_cache, q);
388 free_page((unsigned long) irq_ptr->qdr);
389 free_page(irq_ptr->chsc_page);
390 free_page((unsigned long) irq_ptr);
393 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
394 struct qdio_q **irq_ptr_qs,
397 irq_ptr->qdr->qdf0[i + nr].sliba =
398 (unsigned long)irq_ptr_qs[i]->slib;
400 irq_ptr->qdr->qdf0[i + nr].sla =
401 (unsigned long)irq_ptr_qs[i]->sl;
403 irq_ptr->qdr->qdf0[i + nr].slsba =
404 (unsigned long)&irq_ptr_qs[i]->slsb.val[0];
406 irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
407 irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
408 irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
409 irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
412 static void setup_qdr(struct qdio_irq *irq_ptr,
413 struct qdio_initialize *qdio_init)
417 irq_ptr->qdr->qfmt = qdio_init->q_format;
418 irq_ptr->qdr->ac = qdio_init->qdr_ac;
419 irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
420 irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
421 irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
422 irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
423 irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
424 irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
426 for (i = 0; i < qdio_init->no_input_qs; i++)
427 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
429 for (i = 0; i < qdio_init->no_output_qs; i++)
430 __qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
431 qdio_init->no_input_qs);
434 static void setup_qib(struct qdio_irq *irq_ptr,
435 struct qdio_initialize *init_data)
437 if (qebsm_possible())
438 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
440 irq_ptr->qib.rflags |= init_data->qib_rflags;
442 irq_ptr->qib.qfmt = init_data->q_format;
443 if (init_data->no_input_qs)
444 irq_ptr->qib.isliba =
445 (unsigned long)(irq_ptr->input_qs[0]->slib);
446 if (init_data->no_output_qs)
447 irq_ptr->qib.osliba =
448 (unsigned long)(irq_ptr->output_qs[0]->slib);
449 memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
452 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
454 struct ccw_device *cdev = irq_ptr->cdev;
457 memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
458 memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
459 memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
460 memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
461 memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
463 irq_ptr->debugfs_dev = NULL;
464 irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
465 irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
467 /* wipes qib.ac, required by ar7063 */
468 memset(irq_ptr->qdr, 0, sizeof(struct qdr));
470 irq_ptr->int_parm = init_data->int_parm;
471 irq_ptr->nr_input_qs = init_data->no_input_qs;
472 irq_ptr->nr_output_qs = init_data->no_output_qs;
473 irq_ptr->scan_threshold = init_data->scan_threshold;
474 ccw_device_get_schid(cdev, &irq_ptr->schid);
475 setup_queues(irq_ptr, init_data);
477 if (init_data->irq_poll) {
478 irq_ptr->irq_poll = init_data->irq_poll;
479 set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
481 irq_ptr->irq_poll = NULL;
484 setup_qib(irq_ptr, init_data);
485 qdio_setup_thinint(irq_ptr);
486 set_impl_params(irq_ptr, init_data->qib_param_field_format,
487 init_data->qib_param_field,
488 init_data->input_slib_elements,
489 init_data->output_slib_elements);
491 /* fill input and output descriptors */
492 setup_qdr(irq_ptr, init_data);
494 /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
496 /* get qdio commands */
497 ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
499 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
502 irq_ptr->equeue = *ciw;
504 ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
506 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
509 irq_ptr->aqueue = *ciw;
511 /* set new interrupt handler */
512 spin_lock_irq(get_ccwdev_lock(cdev));
513 irq_ptr->orig_handler = cdev->handler;
514 cdev->handler = qdio_int_handler;
515 spin_unlock_irq(get_ccwdev_lock(cdev));
519 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
523 snprintf(s, 80, "qdio: %s %s on SC %x using "
524 "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n",
525 dev_name(&irq_ptr->cdev->dev),
526 (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
527 ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
528 irq_ptr->schid.sch_no,
529 is_thinint_irq(irq_ptr),
530 (irq_ptr->sch_token) ? 1 : 0,
531 pci_out_supported(irq_ptr) ? 1 : 0,
532 css_general_characteristics.aif_tdd,
533 (irq_ptr->siga_flag.input) ? "R" : " ",
534 (irq_ptr->siga_flag.output) ? "W" : " ",
535 (irq_ptr->siga_flag.sync) ? "S" : " ",
536 (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
537 (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
538 printk(KERN_INFO "%s", s);
541 int qdio_enable_async_operation(struct qdio_output_q *outq)
543 outq->aobs = kcalloc(QDIO_MAX_BUFFERS_PER_Q, sizeof(struct qaob *),
553 void qdio_disable_async_operation(struct qdio_output_q *q)
560 int __init qdio_setup_init(void)
564 qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
569 qdio_aob_cache = kmem_cache_create("qdio_aob",
574 if (!qdio_aob_cache) {
576 goto free_qdio_q_cache;
579 /* Check for OSA/FCP thin interrupts (bit 67). */
580 DBF_EVENT("thinint:%1d",
581 (css_general_characteristics.aif_osa) ? 1 : 0);
583 /* Check for QEBSM support in general (bit 58). */
584 DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
589 kmem_cache_destroy(qdio_q_cache);
593 void qdio_setup_exit(void)
595 kmem_cache_destroy(qdio_aob_cache);
596 kmem_cache_destroy(qdio_q_cache);