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->slib);
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->slib = (struct slib *) __get_free_page(GFP_KERNEL);
113		if (!q->slib) {
114			kmem_cache_free(qdio_q_cache, q);
115			__qdio_free_queues(irq_ptr_qs, i);
116			return -ENOMEM;
117		}
118		irq_ptr_qs[i] = q;
119	}
120	return 0;
121}
122
123int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
124{
125	int rc;
126
127	rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
128	if (rc)
129		return rc;
130
131	rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
132	if (rc) {
133		__qdio_free_queues(irq_ptr->input_qs, nr_input_qs);
134		return rc;
135	}
136
137	irq_ptr->max_input_qs = nr_input_qs;
138	irq_ptr->max_output_qs = nr_output_qs;
139	return 0;
140}
141
142static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
143			      qdio_handler_t *handler, int i)
144{
145	struct slib *slib = q->slib;
146
147	/* queue must be cleared for qdio_establish */
148	memset(q, 0, sizeof(*q));
149	memset(slib, 0, PAGE_SIZE);
150	q->slib = slib;
151	q->irq_ptr = irq_ptr;
152	q->mask = 1 << (31 - i);
153	q->nr = i;
154	q->handler = handler;
155}
156
157static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
158				struct qdio_buffer **sbals_array, int i)
159{
160	struct qdio_q *prev;
161	int j;
162
163	DBF_HEX(&q, sizeof(void *));
164	q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
165
166	/* fill in sbal */
167	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
168		q->sbal[j] = *sbals_array++;
169
170	/* fill in slib */
171	if (i > 0) {
172		prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
173			: irq_ptr->output_qs[i - 1];
174		prev->slib->nsliba = (unsigned long)q->slib;
175	}
176
177	q->slib->sla = (unsigned long)q->sl;
178	q->slib->slsba = (unsigned long)&q->slsb.val[0];
179
180	/* fill in sl */
181	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
182		q->sl->element[j].sbal = virt_to_phys(q->sbal[j]);
183}
184
185static void setup_queues(struct qdio_irq *irq_ptr,
186			 struct qdio_initialize *qdio_init)
187{
188	struct qdio_q *q;
189	int i;
190
191	for_each_input_queue(irq_ptr, q, i) {
192		DBF_EVENT("inq:%1d", i);
193		setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
194
195		q->is_input_q = 1;
196
197		setup_storage_lists(q, irq_ptr,
198				    qdio_init->input_sbal_addr_array[i], i);
199	}
200
201	for_each_output_queue(irq_ptr, q, i) {
202		DBF_EVENT("outq:%1d", i);
203		setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
204
205		q->is_input_q = 0;
206		setup_storage_lists(q, irq_ptr,
207				    qdio_init->output_sbal_addr_array[i], i);
208	}
209}
210
211static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
212				  unsigned char qdioac, unsigned long token)
213{
214	if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
215		goto no_qebsm;
216	if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
217	    (!(qdioac & AC1_SC_QEBSM_ENABLED)))
218		goto no_qebsm;
219
220	irq_ptr->sch_token = token;
221
222	DBF_EVENT("V=V:1");
223	DBF_EVENT("%8lx", irq_ptr->sch_token);
224	return;
225
226no_qebsm:
227	irq_ptr->sch_token = 0;
228	irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
229	DBF_EVENT("noV=V");
230}
231
232/*
233 * If there is a qdio_irq we use the chsc_page and store the information
234 * in the qdio_irq, otherwise we copy it to the specified structure.
235 */
236int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
237			struct subchannel_id *schid,
238			struct qdio_ssqd_desc *data)
239{
240	struct chsc_ssqd_area *ssqd;
241	int rc;
242
243	DBF_EVENT("getssqd:%4x", schid->sch_no);
244	if (!irq_ptr) {
245		ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
246		if (!ssqd)
247			return -ENOMEM;
248	} else {
249		ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
250	}
251
252	rc = chsc_ssqd(*schid, ssqd);
253	if (rc)
254		goto out;
255
256	if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
257	    !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
258	    (ssqd->qdio_ssqd.sch != schid->sch_no))
259		rc = -EINVAL;
260
261	if (!rc)
262		memcpy(data, &ssqd->qdio_ssqd, sizeof(*data));
263
264out:
265	if (!irq_ptr)
266		free_page((unsigned long)ssqd);
267
268	return rc;
269}
270
271void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
272{
273	unsigned char qdioac;
274	int rc;
275
276	rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, &irq_ptr->ssqd_desc);
277	if (rc) {
278		DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
279		DBF_ERROR("rc:%x", rc);
280		/* all flags set, worst case */
281		qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
282			 AC1_SIGA_SYNC_NEEDED;
283	} else
284		qdioac = irq_ptr->ssqd_desc.qdioac1;
285
286	check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
287	irq_ptr->qdioac1 = qdioac;
288	DBF_EVENT("ac 1:%2x 2:%4x", qdioac, irq_ptr->ssqd_desc.qdioac2);
289	DBF_EVENT("3:%4x qib:%4x", irq_ptr->ssqd_desc.qdioac3, irq_ptr->qib.ac);
290}
291
292static void qdio_fill_qdr_desc(struct qdesfmt0 *desc, struct qdio_q *queue)
293{
294	desc->sliba = virt_to_phys(queue->slib);
295	desc->sla = virt_to_phys(queue->sl);
296	desc->slsba = virt_to_phys(&queue->slsb);
297
298	desc->akey = PAGE_DEFAULT_KEY >> 4;
299	desc->bkey = PAGE_DEFAULT_KEY >> 4;
300	desc->ckey = PAGE_DEFAULT_KEY >> 4;
301	desc->dkey = PAGE_DEFAULT_KEY >> 4;
302}
303
304static void setup_qdr(struct qdio_irq *irq_ptr,
305		      struct qdio_initialize *qdio_init)
306{
307	struct qdesfmt0 *desc = &irq_ptr->qdr->qdf0[0];
308	int i;
309
310	memset(irq_ptr->qdr, 0, sizeof(struct qdr));
311
312	irq_ptr->qdr->qfmt = qdio_init->q_format;
313	irq_ptr->qdr->ac = qdio_init->qdr_ac;
314	irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
315	irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
316	irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
317	irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
318	irq_ptr->qdr->qiba = virt_to_phys(&irq_ptr->qib);
319	irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY >> 4;
320
321	for (i = 0; i < qdio_init->no_input_qs; i++)
322		qdio_fill_qdr_desc(desc++, irq_ptr->input_qs[i]);
323
324	for (i = 0; i < qdio_init->no_output_qs; i++)
325		qdio_fill_qdr_desc(desc++, irq_ptr->output_qs[i]);
326}
327
328static void setup_qib(struct qdio_irq *irq_ptr,
329		      struct qdio_initialize *init_data)
330{
331	memset(&irq_ptr->qib, 0, sizeof(irq_ptr->qib));
332
333	irq_ptr->qib.qfmt = init_data->q_format;
334	irq_ptr->qib.pfmt = init_data->qib_param_field_format;
335
336	irq_ptr->qib.rflags = init_data->qib_rflags;
337	if (css_general_characteristics.qebsm)
338		irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
339
340	if (init_data->no_input_qs)
341		irq_ptr->qib.isliba =
342			(unsigned long)(irq_ptr->input_qs[0]->slib);
343	if (init_data->no_output_qs)
344		irq_ptr->qib.osliba =
345			(unsigned long)(irq_ptr->output_qs[0]->slib);
346	memcpy(irq_ptr->qib.ebcnam, dev_name(&irq_ptr->cdev->dev), 8);
347	ASCEBC(irq_ptr->qib.ebcnam, 8);
348
349	if (init_data->qib_param_field)
350		memcpy(irq_ptr->qib.parm, init_data->qib_param_field,
351		       sizeof(irq_ptr->qib.parm));
352}
353
354void qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data)
355{
356	struct ccw_device *cdev = irq_ptr->cdev;
357
358	irq_ptr->qdioac1 = 0;
359	memset(&irq_ptr->ssqd_desc, 0, sizeof(irq_ptr->ssqd_desc));
360	memset(&irq_ptr->perf_stat, 0, sizeof(irq_ptr->perf_stat));
361
362	irq_ptr->debugfs_dev = NULL;
363	irq_ptr->sch_token = irq_ptr->perf_stat_enabled = 0;
364	irq_ptr->state = QDIO_IRQ_STATE_INACTIVE;
365	irq_ptr->error_handler = init_data->input_handler;
366
367	irq_ptr->int_parm = init_data->int_parm;
368	irq_ptr->nr_input_qs = init_data->no_input_qs;
369	irq_ptr->nr_output_qs = init_data->no_output_qs;
370	ccw_device_get_schid(cdev, &irq_ptr->schid);
371	setup_queues(irq_ptr, init_data);
372
373	irq_ptr->irq_poll = init_data->irq_poll;
374	set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
375
376	setup_qib(irq_ptr, init_data);
377
378	/* fill input and output descriptors */
379	setup_qdr(irq_ptr, init_data);
380
381	/* qdr, qib, sls, slsbs, slibs, sbales are filled now */
382
383	/* set our IRQ handler */
384	spin_lock_irq(get_ccwdev_lock(cdev));
385	irq_ptr->orig_handler = cdev->handler;
386	cdev->handler = qdio_int_handler;
387	spin_unlock_irq(get_ccwdev_lock(cdev));
388}
389
390void qdio_shutdown_irq(struct qdio_irq *irq)
391{
392	struct ccw_device *cdev = irq->cdev;
393
394	/* restore IRQ handler */
395	spin_lock_irq(get_ccwdev_lock(cdev));
396	cdev->handler = irq->orig_handler;
397	cdev->private->intparm = 0;
398	spin_unlock_irq(get_ccwdev_lock(cdev));
399}
400
401void qdio_print_subchannel_info(struct qdio_irq *irq_ptr)
402{
403	dev_info(&irq_ptr->cdev->dev,
404		 "qdio: %s on SC %x using AI:%d QEBSM:%d PRI:%d TDD:%d SIGA:%s%s%s\n",
405		 (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
406			((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
407		 irq_ptr->schid.sch_no,
408		 is_thinint_irq(irq_ptr),
409		 (irq_ptr->sch_token) ? 1 : 0,
410		 pci_out_supported(irq_ptr) ? 1 : 0,
411		 css_general_characteristics.aif_tdd,
412		 qdio_need_siga_in(irq_ptr) ? "R" : " ",
413		 qdio_need_siga_out(irq_ptr) ? "W" : " ",
414		 qdio_need_siga_sync(irq_ptr) ? "S" : " ");
415}
416
417int __init qdio_setup_init(void)
418{
419	qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
420					 256, 0, NULL);
421	if (!qdio_q_cache)
422		return -ENOMEM;
423
424	/* Check for OSA/FCP thin interrupts (bit 67). */
425	DBF_EVENT("thinint:%1d",
426		  (css_general_characteristics.aif_osa) ? 1 : 0);
427
428	/* Check for QEBSM support in general (bit 58). */
429	DBF_EVENT("cssQEBSM:%1d", css_general_characteristics.qebsm);
430
431	return 0;
432}
433
434void qdio_setup_exit(void)
435{
436	kmem_cache_destroy(qdio_q_cache);
437}
438