qdio_setup.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * qdio queue initialization
  4 *
  5 * Copyright IBM Corp. 2008
  6 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
  7 */
  8#include <linux/kernel.h>
  9#include <linux/slab.h>
 10#include <linux/export.h>
 11#include <linux/io.h>
 12
 13#include <asm/ebcdic.h>
 14#include <asm/qdio.h>
 15
 16#include "cio.h"
 17#include "css.h"
 18#include "device.h"
 19#include "ioasm.h"
 20#include "chsc.h"
 21#include "qdio.h"
 22#include "qdio_debug.h"
 23
 24#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
 25
 26static struct kmem_cache *qdio_q_cache;
 27
 28/**
 29 * qdio_free_buffers() - free qdio buffers
 30 * @buf: array of pointers to qdio buffers
 31 * @count: number of qdio buffers to free
 32 */
 33void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
 34{
 35	int pos;
 36
 37	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
 38		free_page((unsigned long) buf[pos]);
 39}
 40EXPORT_SYMBOL_GPL(qdio_free_buffers);
 41
 42/**
 43 * qdio_alloc_buffers() - allocate qdio buffers
 44 * @buf: array of pointers to qdio buffers
 45 * @count: number of qdio buffers to allocate
 46 */
 47int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
 48{
 49	int pos;
 50
 51	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
 52		buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
 53		if (!buf[pos]) {
 54			qdio_free_buffers(buf, count);
 55			return -ENOMEM;
 56		}
 57	}
 58	for (pos = 0; pos < count; pos++)
 59		if (pos % QBUFF_PER_PAGE)
 60			buf[pos] = buf[pos - 1] + 1;
 61	return 0;
 62}
 63EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
 64
 65/**
 66 * qdio_reset_buffers() - reset qdio buffers
 67 * @buf: array of pointers to qdio buffers
 68 * @count: number of qdio buffers that will be zeroed
 69 */
 70void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
 71{
 72	int pos;
 73
 74	for (pos = 0; pos < count; pos++)
 75		memset(buf[pos], 0, sizeof(struct qdio_buffer));
 76}
 77EXPORT_SYMBOL_GPL(qdio_reset_buffers);
 78
 79static void __qdio_free_queues(struct qdio_q **queues, unsigned int count)
 80{
 81	struct qdio_q *q;
 82	unsigned int i;
 83
 84	for (i = 0; i < count; i++) {
 85		q = queues[i];
 86		free_page((unsigned long)q->sl_page);
 87		kmem_cache_free(qdio_q_cache, q);
 88	}
 89}
 90
 91void qdio_free_queues(struct qdio_irq *irq_ptr)
 92{
 93	__qdio_free_queues(irq_ptr->input_qs, irq_ptr->max_input_qs);
 94	irq_ptr->max_input_qs = 0;
 95
 96	__qdio_free_queues(irq_ptr->output_qs, irq_ptr->max_output_qs);
 97	irq_ptr->max_output_qs = 0;
 98}
 99
100static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
101{
102	struct qdio_q *q;
103	int i;
104
105	for (i = 0; i < nr_queues; i++) {
106		q = kmem_cache_zalloc(qdio_q_cache, GFP_KERNEL);
107		if (!q) {
108			__qdio_free_queues(irq_ptr_qs, i);
109			return -ENOMEM;
110		}
111
112		q->sl_page = (void *)__get_free_page(GFP_KERNEL);
113		if (!q->sl_page) {
114			kmem_cache_free(qdio_q_cache, q);
115			__qdio_free_queues(irq_ptr_qs, i);
116			return -ENOMEM;
117		}
118		q->slib = q->sl_page;
119		/* As per architecture: SLIB is 2K bytes long, and SL 1K. */
120		q->sl = (struct sl *)(q->slib + 1);
121
122		irq_ptr_qs[i] = q;
123	}
124	return 0;
125}
126
127int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
128{
129	int rc;
130
131	rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
132	if (rc)
133		return rc;
134
135	rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
136	if (rc) {
137		__qdio_free_queues(irq_ptr->input_qs, nr_input_qs);
138		return rc;
139	}
140
141	irq_ptr->max_input_qs = nr_input_qs;
142	irq_ptr->max_output_qs = nr_output_qs;
143	return 0;
144}
145
146static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
147			      qdio_handler_t *handler, int i)
148{
149	struct slib *const slib = q->slib;
150	void *const sl_page = q->sl_page;
151	struct sl *const sl = q->sl;
152
153	/* queue must be cleared for qdio_establish */
154	memset(q, 0, sizeof(*q));
155	memset(sl_page, 0, PAGE_SIZE);
156	q->sl_page = sl_page;
157	q->sl = sl;
158	q->slib = slib;
159	q->irq_ptr = irq_ptr;
160	q->mask = 1 << (31 - i);
161	q->nr = i;
162	q->handler = handler;
163}
164
165static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
166				struct qdio_buffer **sbals_array, int i)
167{
168	struct qdio_q *prev;
169	int j;
170
171	DBF_HEX(&q, sizeof(void *));
172
173	/* fill in sbal */
174	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
175		q->sbal[j] = *sbals_array++;
176
177	/* fill in slib */
178	if (i > 0) {
179		prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
180			: irq_ptr->output_qs[i - 1];
181		prev->slib->nsliba = (unsigned long)q->slib;
182	}
183
184	q->slib->sla = (unsigned long)q->sl;
185	q->slib->slsba = (unsigned long)&q->slsb.val[0];
186
187	/* fill in sl */
188	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
189		q->sl->element[j].sbal = virt_to_dma64(q->sbal[j]);
190}
191
192static void setup_queues(struct qdio_irq *irq_ptr,
193			 struct qdio_initialize *qdio_init)
194{
195	struct qdio_q *q;
196	int i;
197
198	for_each_input_queue(irq_ptr, q, i) {
199		DBF_EVENT("inq:%1d", i);
200		setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
201
202		q->is_input_q = 1;
203
204		setup_storage_lists(q, irq_ptr,
205				    qdio_init->input_sbal_addr_array[i], i);
206	}
207
208	for_each_output_queue(irq_ptr, q, i) {
209		DBF_EVENT("outq:%1d", i);
210		setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
211
212		q->is_input_q = 0;
213		setup_storage_lists(q, irq_ptr,
214				    qdio_init->output_sbal_addr_array[i], i);
215	}
216}
217
218static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
219				  unsigned char qdioac, unsigned long token)
220{
221	if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
222		goto no_qebsm;
223	if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
224	    (!(qdioac & AC1_SC_QEBSM_ENABLED)))
225		goto no_qebsm;
226
227	irq_ptr->sch_token = token;
228
229	DBF_EVENT("V=V:1");
230	DBF_EVENT("%8lx", irq_ptr->sch_token);
231	return;
232
233no_qebsm:
234	irq_ptr->sch_token = 0;
235	irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
236	DBF_EVENT("noV=V");
237}
238
239/*
240 * If there is a qdio_irq we use the chsc_page and store the information
241 * in the qdio_irq, otherwise we copy it to the specified structure.
242 */
243int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
244			struct subchannel_id *schid,
245			struct qdio_ssqd_desc *data)
246{
247	struct chsc_ssqd_area *ssqd;
248	int rc;
249
250	DBF_EVENT("getssqd:%4x", schid->sch_no);
251	if (!irq_ptr) {
252		ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
253		if (!ssqd)
254			return -ENOMEM;
255	} else {
256		ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
257	}
258
259	rc = chsc_ssqd(*schid, ssqd);
260	if (rc)
261		goto out;
262
263	if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
264	    !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
265	    (ssqd->qdio_ssqd.sch != schid->sch_no))
266		rc = -EINVAL;
267
268	if (!rc)
269		memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
270
271out:
272	if (!irq_ptr)
273		free_page((unsigned long)ssqd);
274
275	return rc;
276}
277
278void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
279{
280	unsigned char qdioac;
281	int rc;
282
283	rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
284	if (rc) {
285		DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
286		DBF_ERROR("rc:%x", rc);
287		/* all flags set, worst case */
288		qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
289			 AC1_SIGA_SYNC_NEEDED;
290	} else
291		qdioac = irq_ptr->ssqd_desc.qdioac1;
292
293	check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
294	irq_ptr->qdioac1 = qdioac;
295	DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
296	DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
297}
298
299static void qdio_fill_qdr_desc(struct qdesfmt0 *desc, struct qdio_q *queue)
300{
301	desc->sliba = virt_to_dma64(queue->slib);
302	desc->sla = virt_to_dma64(queue->sl);
303	desc->slsba = virt_to_dma64(&queue->slsb);
304
305	desc->akey = PAGE_DEFAULT_KEY >> 4;
306	desc->bkey = PAGE_DEFAULT_KEY >> 4;
307	desc->ckey = PAGE_DEFAULT_KEY >> 4;
308	desc->dkey = PAGE_DEFAULT_KEY >> 4;
309}
310
311static void setup_qdr(struct qdio_irq *irq_ptr,
312		      struct qdio_initialize *qdio_init)
313{
314	struct qdesfmt0 *desc = &irq_ptr->qdr->qdf0[0];
315	int i;
316
317	memset(irq_ptr->qdr, 0, sizeof(struct qdr));
318
319	irq_ptr->qdr->qfmt = qdio_init->q_format;
320	irq_ptr->qdr->ac = qdio_init->qdr_ac;
321	irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
322	irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
323	irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
324	irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
325	irq_ptr->qdr->qiba = virt_to_dma64(&irq_ptr->qib);
326	irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
327
328	for (i = 0; i < qdio_init->no_input_qs; i++)
329		qdio_fill_qdr_desc(desc++, irq_ptr->input_qs[i]);
330
331	for (i = 0; i < qdio_init->no_output_qs; i++)
332		qdio_fill_qdr_desc(desc++, irq_ptr->output_qs[i]);
333}
334
335static void setup_qib(struct qdio_irq *irq_ptr,
336		      struct qdio_initialize *init_data)
337{
338	memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
339
340	irq_ptr->qib.qfmt = init_data->q_format;
341	irq_ptr->qib.pfmt = init_data->qib_param_field_format;
342
343	irq_ptr->qib.rflags = init_data->qib_rflags;
344	if (css_general_characteristics.qebsm)
345		irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
346
347	if (init_data->no_input_qs)
348		irq_ptr->qib.isliba =
349			(unsigned long)(irq_ptr->input_qs[0]->slib);
350	if (init_data->no_output_qs)
351		irq_ptr->qib.osliba =
352			(unsigned long)(irq_ptr->output_qs[0]->slib);
353	memcpy(irq_ptr->qib.ebcnam, dev_name(&irq_ptr->cdev->dev), 8);
354	ASCEBC(irq_ptr->qib.ebcnam, 8);
355
356	if (init_data->qib_param_field)
357		memcpy(irq_ptr->qib.parm, init_data->qib_param_field,
358		       sizeof(irq_ptr->qib.parm));
359}
360
361void qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
362{
363	struct ccw_device *cdev = irq_ptr->cdev;
364
365	irq_ptr->qdioac1 = 0;
366	memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
367	memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
368
369	irq_ptr->debugfs_dev = NULL;
370	irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
371	irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
372	irq_ptr->error_handler = init_data->input_handler;
373
374	irq_ptr->int_parm = init_data->int_parm;
375	irq_ptr->nr_input_qs = init_data->no_input_qs;
376	irq_ptr->nr_output_qs = init_data->no_output_qs;
377	ccw_device_get_schid(cdev, &irq_ptr->schid);
378	setup_queues(irq_ptr, init_data);
379
380	irq_ptr->irq_poll = init_data->irq_poll;
381	set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
382
383	setup_qib(irq_ptr, init_data);
384
385	/* fill input and output descriptors */
386	setup_qdr(irq_ptr, init_data);
387
388	/* qdr, qib, sls, slsbs, slibs, sbales are filled now */
389
390	/* set our IRQ handler */
391	spin_lock_irq(get_ccwdev_lock(cdev));
392	irq_ptr->orig_handler = cdev->handler;
393	cdev->handler = qdio_int_handler;
394	spin_unlock_irq(get_ccwdev_lock(cdev));
395}
396
397void qdio_shutdown_irq(struct qdio_irq *irq)
398{
399	struct ccw_device *cdev = irq->cdev;
400
401	/* restore IRQ handler */
402	spin_lock_irq(get_ccwdev_lock(cdev));
403	cdev->handler = irq->orig_handler;
404	cdev->private->intparm = 0;
405	spin_unlock_irq(get_ccwdev_lock(cdev));
406}
407
408void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
409{
410	dev_info(&irq_ptr->cdev->dev,
411		 "qdio: %s on SC %x using AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s\n",
412		 (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
413			((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
414		 irq_ptr->schid.sch_no,
415		 is_thinint_irq(irq_ptr),
416		 (irq_ptr->sch_token) ? 1 : 0,
417		 pci_out_supported(irq_ptr) ? 1 : 0,
418		 css_general_characteristics.aif_tdd,
419		 qdio_need_siga_in(irq_ptr) ? "R" : " ",
420		 qdio_need_siga_out(irq_ptr) ? "W" : " ",
421		 qdio_need_siga_sync(irq_ptr) ? "S" : " ");
422}
423
424int __init qdio_setup_init(void)
425{
426	qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
427					 256, 0, NULL);
428	if (!qdio_q_cache)
429		return -ENOMEM;
430
431	/* Check for OSA/FCP thin interrupts (bit 67). */
432	DBF_EVENT("thinint:%1d",
433		  (css_general_characteristics.aif_qdio) ? 1 : 0);
434
435	/* Check for QEBSM support in general (bit 58). */
436	DBF_EVENT("cssQEBSM:%1d", css_general_characteristics.qebsm);
437
438	return 0;
439}
440
441void qdio_setup_exit(void)
442{
443	kmem_cache_destroy(qdio_q_cache);
444}