xref: /linux/drivers/s390/cio/qdio_setup.c (revision b233b28eac0cc37d07c2d007ea08c86c778c5af4) 
1 /*
2  * driver/s390/cio/qdio_setup.c
3  *
4  * qdio queue initialization
5  *
6  * Copyright (C) IBM Corp. 2008
7  * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
8  */
9 #include <linux/kernel.h>
10 #include <linux/slab.h>
11 #include <asm/qdio.h>
12 
13 #include "cio.h"
14 #include "css.h"
15 #include "device.h"
16 #include "ioasm.h"
17 #include "chsc.h"
18 #include "qdio.h"
19 #include "qdio_debug.h"
20 
21 static struct kmem_cache *qdio_q_cache;
22 
23 /*
24  * qebsm is only available under 64bit but the adapter sets the feature
25  * flag anyway, so we manually override it.
26  */
27 static inline int qebsm_possible(void)
28 {
29 #ifdef CONFIG_64BIT
30 	return css_general_characteristics.qebsm;
31 #endif
32 	return 0;
33 }
34 
35 /*
36  * qib_param_field: pointer to 128 bytes or NULL, if no param field
37  * nr_input_qs: pointer to nr_queues*128 words of data or NULL
38  */
39 static void set_impl_params(struct qdio_irq *irq_ptr,
40 			    unsigned int qib_param_field_format,
41 			    unsigned char *qib_param_field,
42 			    unsigned long *input_slib_elements,
43 			    unsigned long *output_slib_elements)
44 {
45 	struct qdio_q *q;
46 	int i, j;
47 
48 	if (!irq_ptr)
49 		return;
50 
51 	WARN_ON((unsigned long)&irq_ptr->qib & 0xff);
52 	irq_ptr->qib.pfmt = qib_param_field_format;
53 	if (qib_param_field)
54 		memcpy(irq_ptr->qib.parm, qib_param_field,
55 		       QDIO_MAX_BUFFERS_PER_Q);
56 
57 	if (!input_slib_elements)
58 		goto output;
59 
60 	for_each_input_queue(irq_ptr, q, i) {
61 		for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
62 			q->slib->slibe[j].parms =
63 				input_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
64 	}
65 output:
66 	if (!output_slib_elements)
67 		return;
68 
69 	for_each_output_queue(irq_ptr, q, i) {
70 		for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
71 			q->slib->slibe[j].parms =
72 				output_slib_elements[i * QDIO_MAX_BUFFERS_PER_Q + j];
73 	}
74 }
75 
76 static int __qdio_allocate_qs(struct qdio_q **irq_ptr_qs, int nr_queues)
77 {
78 	struct qdio_q *q;
79 	int i;
80 
81 	for (i = 0; i < nr_queues; i++) {
82 		q = kmem_cache_alloc(qdio_q_cache, GFP_KERNEL);
83 		if (!q)
84 			return -ENOMEM;
85 		WARN_ON((unsigned long)q & 0xff);
86 
87 		q->slib = (struct slib *) __get_free_page(GFP_KERNEL);
88 		if (!q->slib) {
89 			kmem_cache_free(qdio_q_cache, q);
90 			return -ENOMEM;
91 		}
92 		WARN_ON((unsigned long)q->slib & 0x7ff);
93 		irq_ptr_qs[i] = q;
94 	}
95 	return 0;
96 }
97 
98 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, int nr_output_qs)
99 {
100 	int rc;
101 
102 	rc = __qdio_allocate_qs(irq_ptr->input_qs, nr_input_qs);
103 	if (rc)
104 		return rc;
105 	rc = __qdio_allocate_qs(irq_ptr->output_qs, nr_output_qs);
106 	return rc;
107 }
108 
109 static void setup_queues_misc(struct qdio_q *q, struct qdio_irq *irq_ptr,
110 			      qdio_handler_t *handler, int i)
111 {
112 	/* must be cleared by every qdio_establish */
113 	memset(q, 0, ((char *)&q->slib) - ((char *)q));
114 	memset(q->slib, 0, PAGE_SIZE);
115 
116 	q->irq_ptr = irq_ptr;
117 	q->mask = 1 << (31 - i);
118 	q->nr = i;
119 	q->handler = handler;
120 	spin_lock_init(&q->lock);
121 }
122 
123 static void setup_storage_lists(struct qdio_q *q, struct qdio_irq *irq_ptr,
124 				void **sbals_array, int i)
125 {
126 	struct qdio_q *prev;
127 	int j;
128 
129 	DBF_HEX(&q, sizeof(void *));
130 	q->sl = (struct sl *)((char *)q->slib + PAGE_SIZE / 2);
131 
132 	/* fill in sbal */
133 	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++) {
134 		q->sbal[j] = *sbals_array++;
135 		WARN_ON((unsigned long)q->sbal[j] & 0xff);
136 	}
137 
138 	/* fill in slib */
139 	if (i > 0) {
140 		prev = (q->is_input_q) ? irq_ptr->input_qs[i - 1]
141 			: irq_ptr->output_qs[i - 1];
142 		prev->slib->nsliba = (unsigned long)q->slib;
143 	}
144 
145 	q->slib->sla = (unsigned long)q->sl;
146 	q->slib->slsba = (unsigned long)&q->slsb.val[0];
147 
148 	/* fill in sl */
149 	for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; j++)
150 		q->sl->element[j].sbal = (unsigned long)q->sbal[j];
151 
152 	DBF_EVENT("sl-slsb-sbal");
153 	DBF_HEX(q->sl, sizeof(void *));
154 	DBF_HEX(&q->slsb, sizeof(void *));
155 	DBF_HEX(q->sbal, sizeof(void *));
156 }
157 
158 static void setup_queues(struct qdio_irq *irq_ptr,
159 			 struct qdio_initialize *qdio_init)
160 {
161 	struct qdio_q *q;
162 	void **input_sbal_array = qdio_init->input_sbal_addr_array;
163 	void **output_sbal_array = qdio_init->output_sbal_addr_array;
164 	int i;
165 
166 	for_each_input_queue(irq_ptr, q, i) {
167 		DBF_EVENT("in-q:%1d", i);
168 		setup_queues_misc(q, irq_ptr, qdio_init->input_handler, i);
169 
170 		q->is_input_q = 1;
171 		setup_storage_lists(q, irq_ptr, input_sbal_array, i);
172 		input_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
173 
174 		if (is_thinint_irq(irq_ptr))
175 			tasklet_init(&q->tasklet, tiqdio_inbound_processing,
176 				     (unsigned long) q);
177 		else
178 			tasklet_init(&q->tasklet, qdio_inbound_processing,
179 				     (unsigned long) q);
180 	}
181 
182 	for_each_output_queue(irq_ptr, q, i) {
183 		DBF_EVENT("outq:%1d", i);
184 		setup_queues_misc(q, irq_ptr, qdio_init->output_handler, i);
185 
186 		q->is_input_q = 0;
187 		setup_storage_lists(q, irq_ptr, output_sbal_array, i);
188 		output_sbal_array += QDIO_MAX_BUFFERS_PER_Q;
189 
190 		tasklet_init(&q->tasklet, qdio_outbound_processing,
191 			     (unsigned long) q);
192 		setup_timer(&q->u.out.timer, (void(*)(unsigned long))
193 			    &qdio_outbound_timer, (unsigned long)q);
194 	}
195 }
196 
197 static void process_ac_flags(struct qdio_irq *irq_ptr, unsigned char qdioac)
198 {
199 	if (qdioac & AC1_SIGA_INPUT_NEEDED)
200 		irq_ptr->siga_flag.input = 1;
201 	if (qdioac & AC1_SIGA_OUTPUT_NEEDED)
202 		irq_ptr->siga_flag.output = 1;
203 	if (qdioac & AC1_SIGA_SYNC_NEEDED)
204 		irq_ptr->siga_flag.sync = 1;
205 	if (qdioac & AC1_AUTOMATIC_SYNC_ON_THININT)
206 		irq_ptr->siga_flag.no_sync_ti = 1;
207 	if (qdioac & AC1_AUTOMATIC_SYNC_ON_OUT_PCI)
208 		irq_ptr->siga_flag.no_sync_out_pci = 1;
209 
210 	if (irq_ptr->siga_flag.no_sync_out_pci &&
211 	    irq_ptr->siga_flag.no_sync_ti)
212 		irq_ptr->siga_flag.no_sync_out_ti = 1;
213 }
214 
215 static void check_and_setup_qebsm(struct qdio_irq *irq_ptr,
216 				  unsigned char qdioac, unsigned long token)
217 {
218 	if (!(irq_ptr->qib.rflags & QIB_RFLAGS_ENABLE_QEBSM))
219 		goto no_qebsm;
220 	if (!(qdioac & AC1_SC_QEBSM_AVAILABLE) ||
221 	    (!(qdioac & AC1_SC_QEBSM_ENABLED)))
222 		goto no_qebsm;
223 
224 	irq_ptr->sch_token = token;
225 
226 	DBF_EVENT("V=V:1");
227 	DBF_EVENT("%8lx", irq_ptr->sch_token);
228 	return;
229 
230 no_qebsm:
231 	irq_ptr->sch_token = 0;
232 	irq_ptr->qib.rflags &= ~QIB_RFLAGS_ENABLE_QEBSM;
233 	DBF_EVENT("noV=V");
234 }
235 
236 /*
237  * If there is a qdio_irq we use the chsc_page and store the information
238  * in the qdio_irq, otherwise we copy it to the specified structure.
239  */
240 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
241 			struct subchannel_id *schid,
242 			struct qdio_ssqd_desc *data)
243 {
244 	struct chsc_ssqd_area *ssqd;
245 	int rc;
246 
247 	DBF_EVENT("getssqd:%4x", schid->sch_no);
248 	if (irq_ptr != NULL)
249 		ssqd = (struct chsc_ssqd_area *)irq_ptr->chsc_page;
250 	else
251 		ssqd = (struct chsc_ssqd_area *)__get_free_page(GFP_KERNEL);
252 	memset(ssqd, 0, PAGE_SIZE);
253 
254 	ssqd->request = (struct chsc_header) {
255 		.length = 0x0010,
256 		.code	= 0x0024,
257 	};
258 	ssqd->first_sch = schid->sch_no;
259 	ssqd->last_sch = schid->sch_no;
260 	ssqd->ssid = schid->ssid;
261 
262 	if (chsc(ssqd))
263 		return -EIO;
264 	rc = chsc_error_from_response(ssqd->response.code);
265 	if (rc)
266 		return rc;
267 
268 	if (!(ssqd->qdio_ssqd.flags & CHSC_FLAG_QDIO_CAPABILITY) ||
269 	    !(ssqd->qdio_ssqd.flags & CHSC_FLAG_VALIDITY) ||
270 	    (ssqd->qdio_ssqd.sch != schid->sch_no))
271 		return -EINVAL;
272 
273 	if (irq_ptr != NULL)
274 		memcpy(&irq_ptr->ssqd_desc, &ssqd->qdio_ssqd,
275 		       sizeof(struct qdio_ssqd_desc));
276 	else {
277 		memcpy(data, &ssqd->qdio_ssqd,
278 		       sizeof(struct qdio_ssqd_desc));
279 		free_page((unsigned long)ssqd);
280 	}
281 	return 0;
282 }
283 
284 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr)
285 {
286 	unsigned char qdioac;
287 	int rc;
288 
289 	rc = qdio_setup_get_ssqd(irq_ptr, &irq_ptr->schid, NULL);
290 	if (rc) {
291 		DBF_ERROR("%4x ssqd ERR", irq_ptr->schid.sch_no);
292 		DBF_ERROR("rc:%x", rc);
293 		/* all flags set, worst case */
294 		qdioac = AC1_SIGA_INPUT_NEEDED | AC1_SIGA_OUTPUT_NEEDED |
295 			 AC1_SIGA_SYNC_NEEDED;
296 	} else
297 		qdioac = irq_ptr->ssqd_desc.qdioac1;
298 
299 	check_and_setup_qebsm(irq_ptr, qdioac, irq_ptr->ssqd_desc.sch_token);
300 	process_ac_flags(irq_ptr, qdioac);
301 	DBF_EVENT("qdioac:%4x", qdioac);
302 }
303 
304 void qdio_release_memory(struct qdio_irq *irq_ptr)
305 {
306 	struct qdio_q *q;
307 	int i;
308 
309 	/*
310 	 * Must check queue array manually since irq_ptr->nr_input_queues /
311 	 * irq_ptr->nr_input_queues may not yet be set.
312 	 */
313 	for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
314 		q = irq_ptr->input_qs[i];
315 		if (q) {
316 			free_page((unsigned long) q->slib);
317 			kmem_cache_free(qdio_q_cache, q);
318 		}
319 	}
320 	for (i = 0; i < QDIO_MAX_QUEUES_PER_IRQ; i++) {
321 		q = irq_ptr->output_qs[i];
322 		if (q) {
323 			free_page((unsigned long) q->slib);
324 			kmem_cache_free(qdio_q_cache, q);
325 		}
326 	}
327 	free_page((unsigned long) irq_ptr->qdr);
328 	free_page(irq_ptr->chsc_page);
329 	free_page((unsigned long) irq_ptr);
330 }
331 
332 static void __qdio_allocate_fill_qdr(struct qdio_irq *irq_ptr,
333 				     struct qdio_q **irq_ptr_qs,
334 				     int i, int nr)
335 {
336 	irq_ptr->qdr->qdf0[i + nr].sliba =
337 		(unsigned long)irq_ptr_qs[i]->slib;
338 
339 	irq_ptr->qdr->qdf0[i + nr].sla =
340 		(unsigned long)irq_ptr_qs[i]->sl;
341 
342 	irq_ptr->qdr->qdf0[i + nr].slsba =
343 		(unsigned long)&irq_ptr_qs[i]->slsb.val[0];
344 
345 	irq_ptr->qdr->qdf0[i + nr].akey = PAGE_DEFAULT_KEY;
346 	irq_ptr->qdr->qdf0[i + nr].bkey = PAGE_DEFAULT_KEY;
347 	irq_ptr->qdr->qdf0[i + nr].ckey = PAGE_DEFAULT_KEY;
348 	irq_ptr->qdr->qdf0[i + nr].dkey = PAGE_DEFAULT_KEY;
349 }
350 
351 static void setup_qdr(struct qdio_irq *irq_ptr,
352 		      struct qdio_initialize *qdio_init)
353 {
354 	int i;
355 
356 	irq_ptr->qdr->qfmt = qdio_init->q_format;
357 	irq_ptr->qdr->iqdcnt = qdio_init->no_input_qs;
358 	irq_ptr->qdr->oqdcnt = qdio_init->no_output_qs;
359 	irq_ptr->qdr->iqdsz = sizeof(struct qdesfmt0) / 4; /* size in words */
360 	irq_ptr->qdr->oqdsz = sizeof(struct qdesfmt0) / 4;
361 	irq_ptr->qdr->qiba = (unsigned long)&irq_ptr->qib;
362 	irq_ptr->qdr->qkey = PAGE_DEFAULT_KEY;
363 
364 	for (i = 0; i < qdio_init->no_input_qs; i++)
365 		__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->input_qs, i, 0);
366 
367 	for (i = 0; i < qdio_init->no_output_qs; i++)
368 		__qdio_allocate_fill_qdr(irq_ptr, irq_ptr->output_qs, i,
369 					 qdio_init->no_input_qs);
370 }
371 
372 static void setup_qib(struct qdio_irq *irq_ptr,
373 		      struct qdio_initialize *init_data)
374 {
375 	if (qebsm_possible())
376 		irq_ptr->qib.rflags |= QIB_RFLAGS_ENABLE_QEBSM;
377 
378 	irq_ptr->qib.qfmt = init_data->q_format;
379 	if (init_data->no_input_qs)
380 		irq_ptr->qib.isliba =
381 			(unsigned long)(irq_ptr->input_qs[0]->slib);
382 	if (init_data->no_output_qs)
383 		irq_ptr->qib.osliba =
384 			(unsigned long)(irq_ptr->output_qs[0]->slib);
385 	memcpy(irq_ptr->qib.ebcnam, init_data->adapter_name, 8);
386 }
387 
388 int qdio_setup_irq(struct qdio_initialize *init_data)
389 {
390 	struct ciw *ciw;
391 	struct qdio_irq *irq_ptr = init_data->cdev->private->qdio_data;
392 	int rc;
393 
394 	memset(irq_ptr, 0, ((char *)&irq_ptr->qdr) - ((char *)irq_ptr));
395 	/* wipes qib.ac, required by ar7063 */
396 	memset(irq_ptr->qdr, 0, sizeof(struct qdr));
397 
398 	irq_ptr->int_parm = init_data->int_parm;
399 	irq_ptr->nr_input_qs = init_data->no_input_qs;
400 	irq_ptr->nr_output_qs = init_data->no_output_qs;
401 
402 	irq_ptr->schid = ccw_device_get_subchannel_id(init_data->cdev);
403 	irq_ptr->cdev = init_data->cdev;
404 	setup_queues(irq_ptr, init_data);
405 
406 	setup_qib(irq_ptr, init_data);
407 	qdio_setup_thinint(irq_ptr);
408 	set_impl_params(irq_ptr, init_data->qib_param_field_format,
409 			init_data->qib_param_field,
410 			init_data->input_slib_elements,
411 			init_data->output_slib_elements);
412 
413 	/* fill input and output descriptors */
414 	setup_qdr(irq_ptr, init_data);
415 
416 	/* qdr, qib, sls, slsbs, slibs, sbales are filled now */
417 
418 	/* get qdio commands */
419 	ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_EQUEUE);
420 	if (!ciw) {
421 		DBF_ERROR("%4x NO EQ", irq_ptr->schid.sch_no);
422 		rc = -EINVAL;
423 		goto out_err;
424 	}
425 	irq_ptr->equeue = *ciw;
426 
427 	ciw = ccw_device_get_ciw(init_data->cdev, CIW_TYPE_AQUEUE);
428 	if (!ciw) {
429 		DBF_ERROR("%4x NO AQ", irq_ptr->schid.sch_no);
430 		rc = -EINVAL;
431 		goto out_err;
432 	}
433 	irq_ptr->aqueue = *ciw;
434 
435 	/* set new interrupt handler */
436 	irq_ptr->orig_handler = init_data->cdev->handler;
437 	init_data->cdev->handler = qdio_int_handler;
438 	return 0;
439 out_err:
440 	qdio_release_memory(irq_ptr);
441 	return rc;
442 }
443 
444 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
445 				struct ccw_device *cdev)
446 {
447 	char s[80];
448 
449 	snprintf(s, 80, "qdio: %s %s on SC %x using "
450 		 "AI:%d QEBSM:%d PCI:%d TDD:%d SIGA:%s%s%s%s%s%s\n",
451 		 dev_name(&cdev->dev),
452 		 (irq_ptr->qib.qfmt == QDIO_QETH_QFMT) ? "OSA" :
453 			((irq_ptr->qib.qfmt == QDIO_ZFCP_QFMT) ? "ZFCP" : "HS"),
454 		 irq_ptr->schid.sch_no,
455 		 is_thinint_irq(irq_ptr),
456 		 (irq_ptr->sch_token) ? 1 : 0,
457 		 (irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) ? 1 : 0,
458 		 css_general_characteristics.aif_tdd,
459 		 (irq_ptr->siga_flag.input) ? "R" : " ",
460 		 (irq_ptr->siga_flag.output) ? "W" : " ",
461 		 (irq_ptr->siga_flag.sync) ? "S" : " ",
462 		 (!irq_ptr->siga_flag.no_sync_ti) ? "A" : " ",
463 		 (!irq_ptr->siga_flag.no_sync_out_ti) ? "O" : " ",
464 		 (!irq_ptr->siga_flag.no_sync_out_pci) ? "P" : " ");
465 	printk(KERN_INFO "%s", s);
466 }
467 
468 int __init qdio_setup_init(void)
469 {
470 	qdio_q_cache = kmem_cache_create("qdio_q", sizeof(struct qdio_q),
471 					 256, 0, NULL);
472 	if (!qdio_q_cache)
473 		return -ENOMEM;
474 
475 	/* Check for OSA/FCP thin interrupts (bit 67). */
476 	DBF_EVENT("thinint:%1d",
477 		  (css_general_characteristics.aif_osa) ? 1 : 0);
478 
479 	/* Check for QEBSM support in general (bit 58). */
480 	DBF_EVENT("cssQEBSM:%1d", (qebsm_possible()) ? 1 : 0);
481 	return 0;
482 }
483 
484 void qdio_setup_exit(void)
485 {
486 	kmem_cache_destroy(qdio_q_cache);
487 }
488