xref: /openbmc/linux/drivers/s390/cio/qdio_setup.c (revision a2cce7a9)
1 /*
2  * qdio queue initialization
3  *
4  * Copyright IBM Corp. 2008
5  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
6  */
7 #include <linux/kernel.h>
8 #include <linux/slab.h>
9 #include <linux/export.h>
10 #include <asm/qdio.h>
11 
12 #include "cio.h"
13 #include "css.h"
14 #include "device.h"
15 #include "ioasm.h"
16 #include "chsc.h"
17 #include "qdio.h"
18 #include "qdio_debug.h"
19 
20 #define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
21 
22 static struct kmem_cache *qdio_q_cache;
23 static struct kmem_cache *qdio_aob_cache;
24 
25 struct qaob *qdio_allocate_aob(void)
26 {
27 	return kmem_cache_zalloc(qdio_aob_cache, GFP_ATOMIC);
28 }
29 EXPORT_SYMBOL_GPL(qdio_allocate_aob);
30 
31 void qdio_release_aob(struct qaob *aob)
32 {
33 	kmem_cache_free(qdio_aob_cache, aob);
34 }
35 EXPORT_SYMBOL_GPL(qdio_release_aob);
36 
37 /**
38  * qdio_free_buffers() - free qdio buffers
39  * @buf: array of pointers to qdio buffers
40  * @count: number of qdio buffers to free
41  */
42 void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
43 {
44 	int pos;
45 
46 	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
47 		free_page((unsigned long) buf[pos]);
48 }
49 EXPORT_SYMBOL_GPL(qdio_free_buffers);
50 
51 /**
52  * qdio_alloc_buffers() - allocate qdio buffers
53  * @buf: array of pointers to qdio buffers
54  * @count: number of qdio buffers to allocate
55  */
56 int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
57 {
58 	int pos;
59 
60 	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
61 		buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
62 		if (!buf[pos]) {
63 			qdio_free_buffers(buf, count);
64 			return -ENOMEM;
65 		}
66 	}
67 	for (pos = 0; pos < count; pos++)
68 		if (pos % QBUFF_PER_PAGE)
69 			buf[pos] = buf[pos - 1] + 1;
70 	return 0;
71 }
72 EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
73 
74 /**
75  * qdio_reset_buffers() - reset qdio buffers
76  * @buf: array of pointers to qdio buffers
77  * @count: number of qdio buffers that will be zeroed
78  */
79 void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
80 {
81 	int pos;
82 
83 	for (pos = 0; pos < count; pos++)
84 		memset(buf[pos], 0, sizeof(struct qdio_buffer));
85 }
86 EXPORT_SYMBOL_GPL(qdio_reset_buffers);
87 
88 /*
89  * qebsm is only available under 64bit but the adapter sets the feature
90  * flag anyway, so we manually override it.
91  */
92 static inline int qebsm_possible(void)
93 {
94 	return css_general_characteristics.qebsm;
95 }
96 
97 /*
98  * qib_param_field: pointer to 128 bytes or NULL, if no param field
99  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
100  */
101 static void set_impl_params(struct qdio_irq *irq_ptr,
102 			    unsigned int qib_param_field_format,
103 			    unsigned char *qib_param_field,
104 			    unsigned long *input_slib_elements,
105 			    unsigned long *output_slib_elements)
106 {
107 	struct qdio_q *q;
108 	int i, j;
109 
110 	if (!irq_ptr)
111 		return;
112 
113 	irq_ptr->qib.pfmt = qib_param_field_format;
114 	if (qib_param_field)
115 		memcpy(irq_ptr->qib.parm, qib_param_field,
116 		       QDIO_MAX_BUFFERS_PER_Q);
117 
118 	if (!input_slib_elements)
119 		goto output;
120 
121 	for_each_input_queue(irq_ptr, q, i) {
122 		for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
123 			q->slib->slibe[j].parms =
124 				input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
125 	}
126 output:
127 	if (!output_slib_elements)
128 		return;
129 
130 	for_each_output_queue(irq_ptr, q, i) {
131 		for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
132 			q->slib->slibe[j].parms =
133 				output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
134 	}
135 }
136 
137 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
138 {
139 	struct qdio_q *q;
140 	int i;
141 
142 	for (i = 0; i < nr_queues; i++) {
143 		q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
144 		if (!q)
145 			return -ENOMEM;
146 
147 		q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
148 		if (!q->slib) {
149 			kmem_cache_free(qdio_q_cache, q);
150 			return -ENOMEM;
151 		}
152 		irq_ptr_qs[i] = q;
153 	}
154 	return 0;
155 }
156 
157 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
158 {
159 	int rc;
160 
161 	rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
162 	if (rc)
163 		return rc;
164 	rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
165 	return rc;
166 }
167 
168 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
169 			      qdio_handler_t *handler, int i)
170 {
171 	struct slib *slib = q->slib;
172 
173 	/* queue must be cleared for qdio_establish */
174 	memset(q, 0, sizeof(*q));
175 	memset(slib, 0, PAGE_SIZE);
176 	q->slib = slib;
177 	q->irq_ptr = irq_ptr;
178 	q->mask = 1 << (31 - i);
179 	q->nr = i;
180 	q->handler = handler;
181 }
182 
183 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
184 				void **sbals_array, int i)
185 {
186 	struct qdio_q *prev;
187 	int j;
188 
189 	DBF_HEX(&q, sizeof(void *));
190 	q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
191 
192 	/* fill in sbal */
193 	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
194 		q->sbal[j] = *sbals_array++;
195 
196 	/* fill in slib */
197 	if (i > 0) {
198 		prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
199 			: irq_ptr->output_qs[i - 1];
200 		prev->slib->nsliba = (unsigned long)q->slib;
201 	}
202 
203 	q->slib->sla = (unsigned long)q->sl;
204 	q->slib->slsba = (unsigned long)&q->slsb.val[0];
205 
206 	/* fill in sl */
207 	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
208 		q->sl->element[j].sbal = (unsigned long)q->sbal[j];
209 }
210 
211 static void setup_queues(struct qdio_irq *irq_ptr,
212 			 struct qdio_initialize *qdio_init)
213 {
214 	struct qdio_q *q;
215 	void **input_sbal_array = qdio_init->input_sbal_addr_array;
216 	void **output_sbal_array = qdio_init->output_sbal_addr_array;
217 	struct qdio_outbuf_state *output_sbal_state_array =
218 				  qdio_init->output_sbal_state_array;
219 	int i;
220 
221 	for_each_input_queue(irq_ptr, q, i) {
222 		DBF_EVENT("inq:%1d", i);
223 		setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
224 
225 		q->is_input_q = 1;
226 		q->u.in.queue_start_poll = qdio_init->queue_start_poll_array ?
227 				qdio_init->queue_start_poll_array[i] : NULL;
228 
229 		setup_storage_lists(q, irq_ptr, input_sbal_array, i);
230 		input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
231 
232 		if (is_thinint_irq(irq_ptr)) {
233 			tasklet_init(&q->tasklet, tiqdio_inbound_processing,
234 				     (unsigned long) q);
235 		} else {
236 			tasklet_init(&q->tasklet, qdio_inbound_processing,
237 				     (unsigned long) q);
238 		}
239 	}
240 
241 	for_each_output_queue(irq_ptr, q, i) {
242 		DBF_EVENT("outq:%1d", i);
243 		setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
244 
245 		q->u.out.sbal_state = output_sbal_state_array;
246 		output_sbal_state_array += QDIO_MAX_BUFFERS_PER_Q;
247 
248 		q->is_input_q = 0;
249 		q->u.out.scan_threshold = qdio_init->scan_threshold;
250 		setup_storage_lists(q, irq_ptr, output_sbal_array, i);
251 		output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
252 
253 		tasklet_init(&q->tasklet, qdio_outbound_processing,
254 			     (unsigned long) q);
255 		setup_timer(&q->u.out.timer, (void(*)(unsigned long))
256 			    &qdio_outbound_timer, (unsigned long)q);
257 	}
258 }
259 
260 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
261 {
262 	if (qdioac & AC1_SIGA_INPUT_NEEDED)
263 		irq_ptr->siga_flag.input = 1;
264 	if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
265 		irq_ptr->siga_flag.output = 1;
266 	if (qdioac & AC1_SIGA_SYNC_NEEDED)
267 		irq_ptr->siga_flag.sync = 1;
268 	if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_THININT))
269 		irq_ptr->siga_flag.sync_after_ai = 1;
270 	if (!(qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI))
271 		irq_ptr->siga_flag.sync_out_after_pci = 1;
272 }
273 
274 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
275 				  unsigned char qdioac, unsigned long token)
276 {
277 	if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
278 		goto no_qebsm;
279 	if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
280 	    (!(qdioac & AC1_SC_QEBSM_ENABLED)))
281 		goto no_qebsm;
282 
283 	irq_ptr->sch_token = token;
284 
285 	DBF_EVENT("V=V:1");
286 	DBF_EVENT("%8lx", irq_ptr->sch_token);
287 	return;
288 
289 no_qebsm:
290 	irq_ptr->sch_token = 0;
291 	irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
292 	DBF_EVENT("noV=V");
293 }
294 
295 /*
296  * If there is a qdio_irq we use the chsc_page and store the information
297  * in the qdio_irq, otherwise we copy it to the specified structure.
298  */
299 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
300 			struct subchannel_id *schid,
301 			struct qdio_ssqd_desc *data)
302 {
303 	struct chsc_ssqd_area *ssqd;
304 	int rc;
305 
306 	DBF_EVENT("getssqd:%4x", schid->sch_no);
307 	if (!irq_ptr) {
308 		ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
309 		if (!ssqd)
310 			return -ENOMEM;
311 	} else {
312 		ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
313 	}
314 
315 	rc = chsc_ssqd(*schid, ssqd);
316 	if (rc)
317 		goto out;
318 
319 	if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
320 	    !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
321 	    (ssqd->qdio_ssqd.sch != schid->sch_no))
322 		rc = -EINVAL;
323 
324 	if (!rc)
325 		memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
326 
327 out:
328 	if (!irq_ptr)
329 		free_page((unsigned long)ssqd);
330 
331 	return rc;
332 }
333 
334 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
335 {
336 	unsigned char qdioac;
337 	int rc;
338 
339 	rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
340 	if (rc) {
341 		DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
342 		DBF_ERROR("rc:%x", rc);
343 		/* all flags set, worst case */
344 		qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
345 			 AC1_SIGA_SYNC_NEEDED;
346 	} else
347 		qdioac = irq_ptr->ssqd_desc.qdioac1;
348 
349 	check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
350 	process_ac_flags(irq_ptr, qdioac);
351 	DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
352 	DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
353 }
354 
355 void qdio_release_memory(struct qdio_irq *irq_ptr)
356 {
357 	struct qdio_q *q;
358 	int i;
359 
360 	/*
361 	 * Must check queue array manually since irq_ptr->nr_input_queues /
362 	 * irq_ptr->nr_input_queues may not yet be set.
363 	 */
364 	for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
365 		q = irq_ptr->input_qs[i];
366 		if (q) {
367 			free_page((unsigned long) q->slib);
368 			kmem_cache_free(qdio_q_cache, q);
369 		}
370 	}
371 	for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
372 		q = irq_ptr->output_qs[i];
373 		if (q) {
374 			if (q->u.out.use_cq) {
375 				int n;
376 
377 				for (n = 0; n < QDIO_MAX_BUFFERS_PER_Q; ++n) {
378 					struct qaob *aob = q->u.out.aobs[n];
379 					if (aob) {
380 						qdio_release_aob(aob);
381 						q->u.out.aobs[n] = NULL;
382 					}
383 				}
384 
385 				qdio_disable_async_operation(&q->u.out);
386 			}
387 			free_page((unsigned long) q->slib);
388 			kmem_cache_free(qdio_q_cache, q);
389 		}
390 	}
391 	free_page((unsigned long) irq_ptr->qdr);
392 	free_page(irq_ptr->chsc_page);
393 	free_page((unsigned long) irq_ptr);
394 }
395 
396 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
397 				     struct qdio_q **irq_ptr_qs,
398 				     int i, int nr)
399 {
400 	irq_ptr->qdr->qdf0[i + nr].sliba =
401 		(unsigned long)irq_ptr_qs[i]->slib;
402 
403 	irq_ptr->qdr->qdf0[i + nr].sla =
404 		(unsigned long)irq_ptr_qs[i]->sl;
405 
406 	irq_ptr->qdr->qdf0[i + nr].slsba =
407 		(unsigned long)&irq_ptr_qs[i]->slsb.val[0];
408 
409 	irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY >> 4;
410 	irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY >> 4;
411 	irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY >> 4;
412 	irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY >> 4;
413 }
414 
415 static void setup_qdr(struct qdio_irq *irq_ptr,
416 		      struct qdio_initialize *qdio_init)
417 {
418 	int i;
419 
420 	irq_ptr->qdr->qfmt = qdio_init->q_format;
421 	irq_ptr->qdr->ac = qdio_init->qdr_ac;
422 	irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
423 	irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
424 	irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
425 	irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
426 	irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
427 	irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
428 
429 	for (i = 0; i < qdio_init->no_input_qs; i++)
430 		__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
431 
432 	for (i = 0; i < qdio_init->no_output_qs; i++)
433 		__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
434 					 qdio_init->no_input_qs);
435 }
436 
437 static void setup_qib(struct qdio_irq *irq_ptr,
438 		      struct qdio_initialize *init_data)
439 {
440 	if (qebsm_possible())
441 		irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
442 
443 	irq_ptr->qib.rflags |= init_data->qib_rflags;
444 
445 	irq_ptr->qib.qfmt = init_data->q_format;
446 	if (init_data->no_input_qs)
447 		irq_ptr->qib.isliba =
448 			(unsigned long)(irq_ptr->input_qs[0]->slib);
449 	if (init_data->no_output_qs)
450 		irq_ptr->qib.osliba =
451 			(unsigned long)(irq_ptr->output_qs[0]->slib);
452 	memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
453 }
454 
455 int qdio_setup_irq(struct qdio_initialize *init_data)
456 {
457 	struct ciw *ciw;
458 	struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
459 	int rc;
460 
461 	memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
462 	memset(&irq_ptr->siga_flag, 0, sizeof(irq_ptr->siga_flag));
463 	memset(&irq_ptr->ccw, 0, sizeof(irq_ptr->ccw));
464 	memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
465 	memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
466 
467 	irq_ptr->debugfs_dev = irq_ptr->debugfs_perf = NULL;
468 	irq_ptr->sch_token = irq_ptr->state = irq_ptr->perf_stat_enabled = 0;
469 
470 	/* wipes qib.ac, required by ar7063 */
471 	memset(irq_ptr->qdr, 0, sizeof(struct qdr));
472 
473 	irq_ptr->int_parm = init_data->int_parm;
474 	irq_ptr->nr_input_qs = init_data->no_input_qs;
475 	irq_ptr->nr_output_qs = init_data->no_output_qs;
476 	irq_ptr->cdev = init_data->cdev;
477 	ccw_device_get_schid(irq_ptr->cdev, &irq_ptr->schid);
478 	setup_queues(irq_ptr, init_data);
479 
480 	setup_qib(irq_ptr, init_data);
481 	qdio_setup_thinint(irq_ptr);
482 	set_impl_params(irq_ptr, init_data->qib_param_field_format,
483 			init_data->qib_param_field,
484 			init_data->input_slib_elements,
485 			init_data->output_slib_elements);
486 
487 	/* fill input and output descriptors */
488 	setup_qdr(irq_ptr, init_data);
489 
490 	/* qdr, qib, sls, slsbs, slibs, sbales are filled now */
491 
492 	/* get qdio commands */
493 	ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
494 	if (!ciw) {
495 		DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
496 		rc = -EINVAL;
497 		goto out_err;
498 	}
499 	irq_ptr->equeue = *ciw;
500 
501 	ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
502 	if (!ciw) {
503 		DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
504 		rc = -EINVAL;
505 		goto out_err;
506 	}
507 	irq_ptr->aqueue = *ciw;
508 
509 	/* set new interrupt handler */
510 	irq_ptr->orig_handler = init_data->cdev->handler;
511 	init_data->cdev->handler = qdio_int_handler;
512 	return 0;
513 out_err:
514 	qdio_release_memory(irq_ptr);
515 	return rc;
516 }
517 
518 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
519 				struct ccw_device *cdev)
520 {
521 	char s[80];
522 
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(&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 		 (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 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);
539 }
540 
541 int qdio_enable_async_operation(struct qdio_output_q *outq)
542 {
543 	outq->aobs = kzalloc(sizeof(struct qaob *) * QDIO_MAX_BUFFERS_PER_Q,
544 			     GFP_ATOMIC);
545 	if (!outq->aobs) {
546 		outq->use_cq = 0;
547 		return -ENOMEM;
548 	}
549 	outq->use_cq = 1;
550 	return 0;
551 }
552 
553 void qdio_disable_async_operation(struct qdio_output_q *q)
554 {
555 	kfree(q->aobs);
556 	q->aobs = NULL;
557 	q->use_cq = 0;
558 }
559 
560 int __init qdio_setup_init(void)
561 {
562 	int rc;
563 
564 	qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
565 					 256, 0, NULL);
566 	if (!qdio_q_cache)
567 		return -ENOMEM;
568 
569 	qdio_aob_cache = kmem_cache_create("qdio_aob",
570 					sizeof(struct qaob),
571 					sizeof(struct qaob),
572 					0,
573 					NULL);
574 	if (!qdio_aob_cache) {
575 		rc = -ENOMEM;
576 		goto free_qdio_q_cache;
577 	}
578 
579 	/* Check for OSA/FCP thin interrupts (bit 67). */
580 	DBF_EVENT("thinint:%1d",
581 		  (css_general_characteristics.aif_osa) ? 1 : 0);
582 
583 	/* Check for QEBSM support in general (bit 58). */
584 	DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
585 	rc = 0;
586 out:
587 	return rc;
588 free_qdio_q_cache:
589 	kmem_cache_destroy(qdio_q_cache);
590 	goto out;
591 }
592 
593 void qdio_setup_exit(void)
594 {
595 	kmem_cache_destroy(qdio_aob_cache);
596 	kmem_cache_destroy(qdio_q_cache);
597 }
598