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>
13 #include <asm/ebcdic.h>
22 #include "qdio_debug.h"
24 #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
26 static struct kmem_cache *qdio_q_cache;
27 static struct kmem_cache *qdio_aob_cache;
29 struct qaob *qdio_allocate_aob(void)
31 return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
33 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
35 void qdio_release_aob(struct qaob *aob)
37 kmem_cache_free(qdio_aob_cache, aob);
39 EXPORT_SYMBOL_GPL(qdio_release_aob);
42 * qdio_free_buffers() - free qdio buffers
43 * @buf: array of pointers to qdio buffers
44 * @count: number of qdio buffers to free
46 void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
50 for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
51 free_page((unsigned long) buf[pos]);
53 EXPORT_SYMBOL_GPL(qdio_free_buffers);
56 * qdio_alloc_buffers() - allocate qdio buffers
57 * @buf: array of pointers to qdio buffers
58 * @count: number of qdio buffers to allocate
60 int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
64 for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
65 buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
67 qdio_free_buffers(buf, count);
71 for (pos = 0; pos < count; pos++)
72 if (pos % QBUFF_PER_PAGE)
73 buf[pos] = buf[pos - 1] + 1;
76 EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
79 * qdio_reset_buffers() - reset qdio buffers
80 * @buf: array of pointers to qdio buffers
81 * @count: number of qdio buffers that will be zeroed
83 void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
87 for (pos = 0; pos < count; pos++)
88 memset(buf[pos], 0, sizeof(struct qdio_buffer));
90 EXPORT_SYMBOL_GPL(qdio_reset_buffers);
93 * qebsm is only available under 64bit but the adapter sets the feature
94 * flag anyway, so we manually override it.
96 static inline int qebsm_possible(void)
98 return css_general_characteristics.qebsm;
102 * qib_param_field: pointer to 128 bytes or NULL, if no param field
103 * nr_input_qs: pointer to nr_queues*128 words of data or NULL
105 static void set_impl_params(struct qdio_irq *irq_ptr,
106 unsigned int qib_param_field_format,
107 unsigned char *qib_param_field,
108 unsigned long *input_slib_elements,
109 unsigned long *output_slib_elements)
117 irq_ptr->qib.pfmt = qib_param_field_format;
119 memcpy(irq_ptr->qib.parm, qib_param_field,
120 sizeof(irq_ptr->qib.parm));
122 if (!input_slib_elements)
125 for_each_input_queue(irq_ptr, q, i) {
126 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
127 q->slib->slibe[j].parms =
128 input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
131 if (!output_slib_elements)
134 for_each_output_queue(irq_ptr, q, i) {
135 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
136 q->slib->slibe[j].parms =
137 output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
141 static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)
146 for (i = 0; i < count; i++) {
148 free_page((unsigned long) q->slib);
149 kmem_cache_free(qdio_q_cache, q);
153 void qdio_free_queues(struct qdio_irq *irq_ptr)
155 __qdio_free_queues(irq_ptr->input_qs, irq_ptr->max_input_qs);
156 irq_ptr->max_input_qs = 0;
158 __qdio_free_queues(irq_ptr->output_qs, irq_ptr->max_output_qs);
159 irq_ptr->max_output_qs = 0;
162 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
167 for (i = 0; i < nr_queues; i++) {
168 q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL);
170 __qdio_free_queues(irq_ptr_qs, i);
174 q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
176 kmem_cache_free(qdio_q_cache, q);
177 __qdio_free_queues(irq_ptr_qs, i);
185 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
189 rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
193 rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
195 __qdio_free_queues(irq_ptr->input_qs, nr_input_qs);
199 irq_ptr->max_input_qs = nr_input_qs;
200 irq_ptr->max_output_qs = nr_output_qs;
204 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
205 qdio_handler_t *handler, int i)
207 struct slib *slib = q->slib;
209 /* queue must be cleared for qdio_establish */
210 memset(q, 0, sizeof(*q));
211 memset(slib, 0, PAGE_SIZE);
213 q->irq_ptr = irq_ptr;
214 q->mask = 1 << (31 - i);
216 q->handler = handler;
219 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
220 struct qdio_buffer **sbals_array, int i)
225 DBF_HEX(&q, sizeof(void *));
226 q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
229 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
230 q->sbal[j] = *sbals_array++;
234 prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
235 : irq_ptr->output_qs[i - 1];
236 prev->slib->nsliba = (unsigned long)q->slib;
239 q->slib->sla = (unsigned long)q->sl;
240 q->slib->slsba = (unsigned long)&q->slsb.val[0];
243 for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
244 q->sl->element[j].sbal = virt_to_phys(q->sbal[j]);
247 static void setup_queues(struct qdio_irq *irq_ptr,
248 struct qdio_initialize *qdio_init)
253 for_each_input_queue(irq_ptr, q, i) {
254 DBF_EVENT("inq:%1d", i);
255 setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
259 setup_storage_lists(q, irq_ptr,
260 qdio_init->input_sbal_addr_array[i], i);
263 for_each_output_queue(irq_ptr, q, i) {
264 DBF_EVENT("outq:%1d", i);
265 setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
268 setup_storage_lists(q, irq_ptr,
269 qdio_init->output_sbal_addr_array[i], i);
271 tasklet_setup(&q->u.out.tasklet, qdio_outbound_tasklet);
272 timer_setup(&q->u.out.timer, qdio_outbound_timer, 0);
276 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
278 if (qdioac & AC1_SIGA_INPUT_NEEDED)
279 irq_ptr->siga_flag.input = 1;
280 if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
281 irq_ptr->siga_flag.output = 1;
282 if (qdioac & AC1_SIGA_SYNC_NEEDED)
283 irq_ptr->siga_flag.sync = 1;
284 if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
285 irq_ptr->siga_flag.sync_after_ai = 1;
286 if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
287 irq_ptr->siga_flag.sync_out_after_pci = 1;
290 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
291 unsigned char qdioac, unsigned long token)
293 if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
295 if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
296 (!(qdioac & AC1_SC_QEBSM_ENABLED)))
299 irq_ptr->sch_token = token;
302 DBF_EVENT("%8lx", irq_ptr->sch_token);
306 irq_ptr->sch_token = 0;
307 irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
312 * If there is a qdio_irq we use the chsc_page and store the information
313 * in the qdio_irq, otherwise we copy it to the specified structure.
315 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
316 struct subchannel_id *schid,
317 struct qdio_ssqd_desc *data)
319 struct chsc_ssqd_area *ssqd;
322 DBF_EVENT("getssqd:%4x", schid->sch_no);
324 ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
328 ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
331 rc = chsc_ssqd(*schid, ssqd);
335 if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
336 !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
337 (ssqd->qdio_ssqd.sch != schid->sch_no))
341 memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
345 free_page((unsigned long)ssqd);
350 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
352 unsigned char qdioac;
355 rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
357 DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
358 DBF_ERROR("rc:%x", rc);
359 /* all flags set, worst case */
360 qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
361 AC1_SIGA_SYNC_NEEDED;
363 qdioac = irq_ptr->ssqd_desc.qdioac1;
365 check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
366 process_ac_flags(irq_ptr, qdioac);
367 DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
368 DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
371 static void qdio_fill_qdr_desc(struct qdesfmt0 *desc, struct qdio_q *queue)
373 desc->sliba = virt_to_phys(queue->slib);
374 desc->sla = virt_to_phys(queue->sl);
375 desc->slsba = virt_to_phys(&queue->slsb);
377 desc->akey = PAGE_DEFAULT_KEY >> 4;
378 desc->bkey = PAGE_DEFAULT_KEY >> 4;
379 desc->ckey = PAGE_DEFAULT_KEY >> 4;
380 desc->dkey = PAGE_DEFAULT_KEY >> 4;
383 static void setup_qdr(struct qdio_irq *irq_ptr,
384 struct qdio_initialize *qdio_init)
386 struct qdesfmt0 *desc = &irq_ptr->qdr->qdf0[0];
389 irq_ptr->qdr->qfmt = qdio_init->q_format;
390 irq_ptr->qdr->ac = qdio_init->qdr_ac;
391 irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
392 irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
393 irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
394 irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
395 irq_ptr->qdr->qiba = virt_to_phys(&irq_ptr->qib);
396 irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
398 for (i = 0; i < qdio_init->no_input_qs; i++)
399 qdio_fill_qdr_desc(desc++, irq_ptr->input_qs[i]);
401 for (i = 0; i < qdio_init->no_output_qs; i++)
402 qdio_fill_qdr_desc(desc++, irq_ptr->output_qs[i]);
405 static void setup_qib(struct qdio_irq *irq_ptr,
406 struct qdio_initialize *init_data)
408 if (qebsm_possible())
409 irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
411 irq_ptr->qib.rflags |= init_data->qib_rflags;
413 irq_ptr->qib.qfmt = init_data->q_format;
414 if (init_data->no_input_qs)
415 irq_ptr->qib.isliba =
416 (unsigned long)(irq_ptr->input_qs[0]->slib);
417 if (init_data->no_output_qs)
418 irq_ptr->qib.osliba =
419 (unsigned long)(irq_ptr->output_qs[0]->slib);
420 memcpy(irq_ptr->qib.ebcnam, dev_name(&irq_ptr->cdev->dev), 8);
421 ASCEBC(irq_ptr->qib.ebcnam, 8);
424 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
426 struct ccw_device *cdev = irq_ptr->cdev;
429 memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
430 memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
431 memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
432 memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
433 memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
435 irq_ptr->debugfs_dev = NULL;
436 irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
437 irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
439 /* wipes qib.ac, required by ar7063 */
440 memset(irq_ptr->qdr, 0, sizeof(struct qdr));
442 irq_ptr->int_parm = init_data->int_parm;
443 irq_ptr->nr_input_qs = init_data->no_input_qs;
444 irq_ptr->nr_output_qs = init_data->no_output_qs;
445 irq_ptr->scan_threshold = init_data->scan_threshold;
446 ccw_device_get_schid(cdev, &irq_ptr->schid);
447 setup_queues(irq_ptr, init_data);
449 irq_ptr->irq_poll = init_data->irq_poll;
450 set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
452 setup_qib(irq_ptr, init_data);
453 set_impl_params(irq_ptr, init_data->qib_param_field_format,
454 init_data->qib_param_field,
455 init_data->input_slib_elements,
456 init_data->output_slib_elements);
458 /* fill input and output descriptors */
459 setup_qdr(irq_ptr, init_data);
461 /* qdr, qib, sls, slsbs, slibs, sbales are filled now */
463 /* set our IRQ handler */
464 spin_lock_irq(get_ccwdev_lock(cdev));
465 irq_ptr->orig_handler = cdev->handler;
466 cdev->handler = qdio_int_handler;
467 spin_unlock_irq(get_ccwdev_lock(cdev));
469 /* get qdio commands */
470 ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
472 DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
475 irq_ptr->equeue = *ciw;
477 ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
479 DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
482 irq_ptr->aqueue = *ciw;
487 void qdio_shutdown_irq(struct qdio_irq *irq)
489 struct ccw_device *cdev = irq->cdev;
491 /* restore IRQ handler */
492 spin_lock_irq(get_ccwdev_lock(cdev));
493 cdev->handler = irq->orig_handler;
494 cdev->private->intparm = 0;
495 spin_unlock_irq(get_ccwdev_lock(cdev));
498 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
502 snprintf(s, 80, "qdio: %s %s on SC %x using "
503 "AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s%s%s\n",
504 dev_name(&irq_ptr->cdev->dev),
505 (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
506 ((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
507 irq_ptr->schid.sch_no,
508 is_thinint_irq(irq_ptr),
509 (irq_ptr->sch_token) ? 1 : 0,
510 pci_out_supported(irq_ptr) ? 1 : 0,
511 css_general_characteristics.aif_tdd,
512 (irq_ptr->siga_flag.input) ? "R" : " ",
513 (irq_ptr->siga_flag.output) ? "W" : " ",
514 (irq_ptr->siga_flag.sync) ? "S" : " ",
515 (irq_ptr->siga_flag.sync_after_ai) ? "A" : " ",
516 (irq_ptr->siga_flag.sync_out_after_pci) ? "P" : " ");
517 printk(KERN_INFO "%s", s);
520 int __init qdio_setup_init(void)
524 qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
529 qdio_aob_cache = kmem_cache_create("qdio_aob",
534 if (!qdio_aob_cache) {
536 goto free_qdio_q_cache;
539 /* Check for OSA/FCP thin interrupts (bit 67). */
540 DBF_EVENT("thinint:%1d",
541 (css_general_characteristics.aif_osa) ? 1 : 0);
543 /* Check for QEBSM support in general (bit 58). */
544 DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
549 kmem_cache_destroy(qdio_q_cache);
553 void qdio_setup_exit(void)
555 kmem_cache_destroy(qdio_aob_cache);
556 kmem_cache_destroy(qdio_q_cache);