blob: 2dc2831840ca1852efb1cec280ced8b2e0afb0ae [file] [log] [blame]
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -07001/*
2 * xen console driver interface to hvc_console.c
3 *
4 * (c) 2007 Gerd Hoffmann <kraxel@suse.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/console.h>
22#include <linux/delay.h>
23#include <linux/err.h>
Stefano Stabellini4d9310e2012-08-06 15:27:09 +010024#include <linux/irq.h>
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070025#include <linux/init.h>
26#include <linux/types.h>
Stefano Stabellini02e19f92012-01-30 16:02:31 +000027#include <linux/list.h>
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070028
Stefano Stabellinieb5ef072012-01-27 18:31:36 +000029#include <asm/io.h>
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070030#include <asm/xen/hypervisor.h>
Jeremy Fitzhardinge1ccbf532009-10-06 15:11:14 -070031
32#include <xen/xen.h>
Stefano Stabellinieb5ef072012-01-27 18:31:36 +000033#include <xen/interface/xen.h>
34#include <xen/hvm.h>
Stefano Stabellini02e19f92012-01-30 16:02:31 +000035#include <xen/grant_table.h>
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070036#include <xen/page.h>
37#include <xen/events.h>
38#include <xen/interface/io/console.h>
Stefano Stabellini4d9310e2012-08-06 15:27:09 +010039#include <xen/interface/sched.h>
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070040#include <xen/hvc-console.h>
Stefano Stabellini02e19f92012-01-30 16:02:31 +000041#include <xen/xenbus.h>
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070042
43#include "hvc_console.h"
44
45#define HVC_COOKIE 0x58656e /* "Xen" in hex */
46
Stefano Stabellini02e19f92012-01-30 16:02:31 +000047struct xencons_info {
48 struct list_head list;
49 struct xenbus_device *xbdev;
50 struct xencons_interface *intf;
51 unsigned int evtchn;
52 struct hvc_struct *hvc;
53 int irq;
54 int vtermno;
55 grant_ref_t gntref;
56};
57
58static LIST_HEAD(xenconsoles);
59static DEFINE_SPINLOCK(xencons_lock);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070060
61/* ------------------------------------------------------------------ */
62
Stefano Stabellini02e19f92012-01-30 16:02:31 +000063static struct xencons_info *vtermno_to_xencons(int vtermno)
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070064{
Stefano Stabellini02e19f92012-01-30 16:02:31 +000065 struct xencons_info *entry, *n, *ret = NULL;
66
67 if (list_empty(&xenconsoles))
68 return NULL;
69
70 list_for_each_entry_safe(entry, n, &xenconsoles, list) {
71 if (entry->vtermno == vtermno) {
72 ret = entry;
73 break;
74 }
75 }
76
77 return ret;
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070078}
79
Stefano Stabellini02e19f92012-01-30 16:02:31 +000080static inline int xenbus_devid_to_vtermno(int devid)
81{
82 return devid + HVC_COOKIE;
83}
84
85static inline void notify_daemon(struct xencons_info *cons)
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070086{
87 /* Use evtchn: this is called early, before irq is set up. */
Stefano Stabellini02e19f92012-01-30 16:02:31 +000088 notify_remote_via_evtchn(cons->evtchn);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070089}
90
Stefano Stabellini02e19f92012-01-30 16:02:31 +000091static int __write_console(struct xencons_info *xencons,
92 const char *data, int len)
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070093{
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070094 XENCONS_RING_IDX cons, prod;
Stefano Stabellini02e19f92012-01-30 16:02:31 +000095 struct xencons_interface *intf = xencons->intf;
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -070096 int sent = 0;
97
98 cons = intf->out_cons;
99 prod = intf->out_prod;
100 mb(); /* update queue values before going on */
101 BUG_ON((prod - cons) > sizeof(intf->out));
102
103 while ((sent < len) && ((prod - cons) < sizeof(intf->out)))
104 intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++];
105
106 wmb(); /* write ring before updating pointer */
107 intf->out_prod = prod;
108
Jeremy Fitzhardinge403a85f2010-10-14 11:38:47 -0700109 if (sent)
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000110 notify_daemon(xencons);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700111 return sent;
112}
113
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100114static int domU_write_console(uint32_t vtermno, const char *data, int len)
Jeremy Fitzhardinge7825cf12009-10-20 15:28:21 +0900115{
116 int ret = len;
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000117 struct xencons_info *cons = vtermno_to_xencons(vtermno);
118 if (cons == NULL)
119 return -EINVAL;
Jeremy Fitzhardinge7825cf12009-10-20 15:28:21 +0900120
121 /*
122 * Make sure the whole buffer is emitted, polling if
123 * necessary. We don't ever want to rely on the hvc daemon
124 * because the most interesting console output is when the
125 * kernel is crippled.
126 */
127 while (len) {
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000128 int sent = __write_console(cons, data, len);
Jeremy Fitzhardinge7825cf12009-10-20 15:28:21 +0900129
130 data += sent;
131 len -= sent;
132
133 if (unlikely(len))
134 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
135 }
136
137 return ret;
138}
139
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100140static int domU_read_console(uint32_t vtermno, char *buf, int len)
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700141{
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000142 struct xencons_interface *intf;
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700143 XENCONS_RING_IDX cons, prod;
144 int recv = 0;
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000145 struct xencons_info *xencons = vtermno_to_xencons(vtermno);
146 if (xencons == NULL)
147 return -EINVAL;
148 intf = xencons->intf;
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700149
150 cons = intf->in_cons;
151 prod = intf->in_prod;
152 mb(); /* get pointers before reading ring */
153 BUG_ON((prod - cons) > sizeof(intf->in));
154
155 while (cons != prod && recv < len)
156 buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)];
157
158 mb(); /* read ring before consuming */
159 intf->in_cons = cons;
160
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000161 notify_daemon(xencons);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700162 return recv;
163}
164
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100165static struct hv_ops domU_hvc_ops = {
166 .get_chars = domU_read_console,
167 .put_chars = domU_write_console,
Christian Borntraeger611e0972008-06-20 15:24:08 +0200168 .notifier_add = notifier_add_irq,
169 .notifier_del = notifier_del_irq,
Hendrik Bruecknerfc362e22008-10-13 23:12:48 +0000170 .notifier_hangup = notifier_hangup_irq,
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700171};
172
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100173static int dom0_read_console(uint32_t vtermno, char *buf, int len)
174{
175 return HYPERVISOR_console_io(CONSOLEIO_read, len, buf);
176}
177
178/*
179 * Either for a dom0 to write to the system console, or a domU with a
180 * debug version of Xen
181 */
182static int dom0_write_console(uint32_t vtermno, const char *str, int len)
183{
184 int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
185 if (rc < 0)
Konrad Rzeszutek Wilk04b772d2013-09-27 17:18:13 -0400186 return rc;
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100187
188 return len;
189}
190
191static struct hv_ops dom0_hvc_ops = {
192 .get_chars = dom0_read_console,
193 .put_chars = dom0_write_console,
194 .notifier_add = notifier_add_irq,
195 .notifier_del = notifier_del_irq,
196 .notifier_hangup = notifier_hangup_irq,
197};
198
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000199static int xen_hvm_console_init(void)
200{
201 int r;
202 uint64_t v = 0;
203 unsigned long mfn;
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000204 struct xencons_info *info;
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000205
206 if (!xen_hvm_domain())
207 return -ENODEV;
208
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000209 info = vtermno_to_xencons(HVC_COOKIE);
210 if (!info) {
Joe Perches2d1d3f32013-08-29 14:08:18 -0700211 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000212 if (!info)
213 return -ENOMEM;
Konrad Rzeszutek Wilk37a80bf2012-06-26 09:30:51 -0400214 } else if (info->intf != NULL) {
215 /* already configured */
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000216 return 0;
Konrad Rzeszutek Wilk37a80bf2012-06-26 09:30:51 -0400217 }
Konrad Rzeszutek Wilk5842f5762012-05-23 12:56:59 -0400218 /*
219 * If the toolstack (or the hypervisor) hasn't set these values, the
220 * default value is 0. Even though mfn = 0 and evtchn = 0 are
221 * theoretically correct values, in practice they never are and they
222 * mean that a legacy toolstack hasn't initialized the pv console correctly.
223 */
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000224 r = hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN, &v);
Konrad Rzeszutek Wilk5842f5762012-05-23 12:56:59 -0400225 if (r < 0 || v == 0)
Konrad Rzeszutek Wilk2e5ad6b2012-05-23 12:53:11 -0400226 goto err;
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000227 info->evtchn = v;
Konrad Rzeszutek Wilka32c88b2012-05-23 12:55:38 -0400228 v = 0;
229 r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
Konrad Rzeszutek Wilk5842f5762012-05-23 12:56:59 -0400230 if (r < 0 || v == 0)
Konrad Rzeszutek Wilk2e5ad6b2012-05-23 12:53:11 -0400231 goto err;
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000232 mfn = v;
Stefano Stabellini3216dce2013-02-19 13:59:19 +0000233 info->intf = xen_remap(mfn << PAGE_SHIFT, PAGE_SIZE);
Konrad Rzeszutek Wilk2e5ad6b2012-05-23 12:53:11 -0400234 if (info->intf == NULL)
235 goto err;
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000236 info->vtermno = HVC_COOKIE;
237
238 spin_lock(&xencons_lock);
239 list_add_tail(&info->list, &xenconsoles);
240 spin_unlock(&xencons_lock);
241
242 return 0;
Konrad Rzeszutek Wilk2e5ad6b2012-05-23 12:53:11 -0400243err:
244 kfree(info);
245 return -ENODEV;
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000246}
247
248static int xen_pv_console_init(void)
249{
250 struct xencons_info *info;
251
252 if (!xen_pv_domain())
253 return -ENODEV;
254
255 if (!xen_start_info->console.domU.evtchn)
256 return -ENODEV;
257
258 info = vtermno_to_xencons(HVC_COOKIE);
259 if (!info) {
Joe Perches2d1d3f32013-08-29 14:08:18 -0700260 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000261 if (!info)
262 return -ENOMEM;
Konrad Rzeszutek Wilk37a80bf2012-06-26 09:30:51 -0400263 } else if (info->intf != NULL) {
264 /* already configured */
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000265 return 0;
Konrad Rzeszutek Wilk37a80bf2012-06-26 09:30:51 -0400266 }
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000267 info->evtchn = xen_start_info->console.domU.evtchn;
268 info->intf = mfn_to_virt(xen_start_info->console.domU.mfn);
269 info->vtermno = HVC_COOKIE;
270
271 spin_lock(&xencons_lock);
272 list_add_tail(&info->list, &xenconsoles);
273 spin_unlock(&xencons_lock);
274
275 return 0;
276}
277
278static int xen_initial_domain_console_init(void)
279{
280 struct xencons_info *info;
281
282 if (!xen_initial_domain())
283 return -ENODEV;
284
285 info = vtermno_to_xencons(HVC_COOKIE);
286 if (!info) {
Joe Perches2d1d3f32013-08-29 14:08:18 -0700287 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000288 if (!info)
289 return -ENOMEM;
290 }
291
292 info->irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
293 info->vtermno = HVC_COOKIE;
294
295 spin_lock(&xencons_lock);
296 list_add_tail(&info->list, &xenconsoles);
297 spin_unlock(&xencons_lock);
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000298
299 return 0;
300}
301
Jeremy Fitzhardinge6b9b7322008-05-26 23:31:25 +0100302void xen_console_resume(void)
303{
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000304 struct xencons_info *info = vtermno_to_xencons(HVC_COOKIE);
305 if (info != NULL && info->irq)
306 rebind_evtchn_irq(info->evtchn, info->irq);
Jeremy Fitzhardinge6b9b7322008-05-26 23:31:25 +0100307}
308
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000309static void xencons_disconnect_backend(struct xencons_info *info)
310{
311 if (info->irq > 0)
312 unbind_from_irqhandler(info->irq, NULL);
313 info->irq = 0;
314 if (info->evtchn > 0)
315 xenbus_free_evtchn(info->xbdev, info->evtchn);
316 info->evtchn = 0;
317 if (info->gntref > 0)
318 gnttab_free_grant_references(info->gntref);
319 info->gntref = 0;
320 if (info->hvc != NULL)
321 hvc_remove(info->hvc);
322 info->hvc = NULL;
323}
324
325static void xencons_free(struct xencons_info *info)
326{
327 free_page((unsigned long)info->intf);
328 info->intf = NULL;
329 info->vtermno = 0;
330 kfree(info);
331}
332
333static int xen_console_remove(struct xencons_info *info)
334{
335 xencons_disconnect_backend(info);
336 spin_lock(&xencons_lock);
337 list_del(&info->list);
338 spin_unlock(&xencons_lock);
339 if (info->xbdev != NULL)
340 xencons_free(info);
341 else {
342 if (xen_hvm_domain())
343 iounmap(info->intf);
344 kfree(info);
345 }
346 return 0;
347}
348
Stefano Stabellinicf8e0192012-02-21 11:30:42 +0000349#ifdef CONFIG_HVC_XEN_FRONTEND
350static struct xenbus_driver xencons_driver;
351
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000352static int xencons_remove(struct xenbus_device *dev)
353{
354 return xen_console_remove(dev_get_drvdata(&dev->dev));
355}
356
357static int xencons_connect_backend(struct xenbus_device *dev,
358 struct xencons_info *info)
359{
360 int ret, evtchn, devid, ref, irq;
361 struct xenbus_transaction xbt;
362 grant_ref_t gref_head;
363 unsigned long mfn;
364
365 ret = xenbus_alloc_evtchn(dev, &evtchn);
366 if (ret)
367 return ret;
368 info->evtchn = evtchn;
369 irq = bind_evtchn_to_irq(evtchn);
370 if (irq < 0)
371 return irq;
372 info->irq = irq;
373 devid = dev->nodename[strlen(dev->nodename) - 1] - '0';
374 info->hvc = hvc_alloc(xenbus_devid_to_vtermno(devid),
375 irq, &domU_hvc_ops, 256);
376 if (IS_ERR(info->hvc))
377 return PTR_ERR(info->hvc);
378 if (xen_pv_domain())
379 mfn = virt_to_mfn(info->intf);
380 else
381 mfn = __pa(info->intf) >> PAGE_SHIFT;
382 ret = gnttab_alloc_grant_references(1, &gref_head);
383 if (ret < 0)
384 return ret;
385 info->gntref = gref_head;
386 ref = gnttab_claim_grant_reference(&gref_head);
387 if (ref < 0)
388 return ref;
389 gnttab_grant_foreign_access_ref(ref, info->xbdev->otherend_id,
390 mfn, 0);
391
392 again:
393 ret = xenbus_transaction_start(&xbt);
394 if (ret) {
395 xenbus_dev_fatal(dev, ret, "starting transaction");
396 return ret;
397 }
398 ret = xenbus_printf(xbt, dev->nodename, "ring-ref", "%d", ref);
399 if (ret)
400 goto error_xenbus;
401 ret = xenbus_printf(xbt, dev->nodename, "port", "%u",
402 evtchn);
403 if (ret)
404 goto error_xenbus;
405 ret = xenbus_printf(xbt, dev->nodename, "type", "ioemu");
406 if (ret)
407 goto error_xenbus;
408 ret = xenbus_transaction_end(xbt, 0);
409 if (ret) {
410 if (ret == -EAGAIN)
411 goto again;
412 xenbus_dev_fatal(dev, ret, "completing transaction");
413 return ret;
414 }
415
416 xenbus_switch_state(dev, XenbusStateInitialised);
417 return 0;
418
419 error_xenbus:
420 xenbus_transaction_end(xbt, 1);
421 xenbus_dev_fatal(dev, ret, "writing xenstore");
422 return ret;
423}
424
Bill Pemberton9671f092012-11-19 13:21:50 -0500425static int xencons_probe(struct xenbus_device *dev,
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000426 const struct xenbus_device_id *id)
427{
428 int ret, devid;
429 struct xencons_info *info;
430
431 devid = dev->nodename[strlen(dev->nodename) - 1] - '0';
432 if (devid == 0)
433 return -ENODEV;
434
Dan Carpenter201a52b2012-05-15 11:47:47 +0300435 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000436 if (!info)
Dan Carpenter201a52b2012-05-15 11:47:47 +0300437 return -ENOMEM;
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000438 dev_set_drvdata(&dev->dev, info);
439 info->xbdev = dev;
440 info->vtermno = xenbus_devid_to_vtermno(devid);
441 info->intf = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
442 if (!info->intf)
443 goto error_nomem;
444
445 ret = xencons_connect_backend(dev, info);
446 if (ret < 0)
447 goto error;
448 spin_lock(&xencons_lock);
449 list_add_tail(&info->list, &xenconsoles);
450 spin_unlock(&xencons_lock);
451
452 return 0;
453
454 error_nomem:
455 ret = -ENOMEM;
456 xenbus_dev_fatal(dev, ret, "allocating device memory");
457 error:
458 xencons_disconnect_backend(info);
459 xencons_free(info);
460 return ret;
461}
462
463static int xencons_resume(struct xenbus_device *dev)
464{
465 struct xencons_info *info = dev_get_drvdata(&dev->dev);
466
467 xencons_disconnect_backend(info);
468 memset(info->intf, 0, PAGE_SIZE);
469 return xencons_connect_backend(dev, info);
470}
471
472static void xencons_backend_changed(struct xenbus_device *dev,
473 enum xenbus_state backend_state)
474{
475 switch (backend_state) {
476 case XenbusStateReconfiguring:
477 case XenbusStateReconfigured:
478 case XenbusStateInitialising:
479 case XenbusStateInitialised:
480 case XenbusStateUnknown:
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000481 break;
482
483 case XenbusStateInitWait:
484 break;
485
486 case XenbusStateConnected:
487 xenbus_switch_state(dev, XenbusStateConnected);
488 break;
489
David Vrabel9b6934a2012-09-21 17:04:24 +0100490 case XenbusStateClosed:
491 if (dev->state == XenbusStateClosed)
492 break;
493 /* Missed the backend's CLOSING state -- fallthrough */
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000494 case XenbusStateClosing:
495 xenbus_frontend_closed(dev);
496 break;
497 }
498}
499
500static const struct xenbus_device_id xencons_ids[] = {
501 { "console" },
502 { "" }
503};
504
505
Stefano Stabellinicf8e0192012-02-21 11:30:42 +0000506static DEFINE_XENBUS_DRIVER(xencons, "xenconsole",
507 .probe = xencons_probe,
508 .remove = xencons_remove,
509 .resume = xencons_resume,
510 .otherend_changed = xencons_backend_changed,
511);
512#endif /* CONFIG_HVC_XEN_FRONTEND */
513
514static int __init xen_hvc_init(void)
515{
516 int r;
517 struct xencons_info *info;
518 const struct hv_ops *ops;
519
520 if (!xen_domain())
521 return -ENODEV;
522
523 if (xen_initial_domain()) {
524 ops = &dom0_hvc_ops;
525 r = xen_initial_domain_console_init();
526 if (r < 0)
527 return r;
528 info = vtermno_to_xencons(HVC_COOKIE);
529 } else {
530 ops = &domU_hvc_ops;
531 if (xen_hvm_domain())
532 r = xen_hvm_console_init();
533 else
534 r = xen_pv_console_init();
535 if (r < 0)
536 return r;
537
538 info = vtermno_to_xencons(HVC_COOKIE);
539 info->irq = bind_evtchn_to_irq(info->evtchn);
540 }
541 if (info->irq < 0)
542 info->irq = 0; /* NO_IRQ */
543 else
544 irq_set_noprobe(info->irq);
545
546 info->hvc = hvc_alloc(HVC_COOKIE, info->irq, ops, 256);
547 if (IS_ERR(info->hvc)) {
548 r = PTR_ERR(info->hvc);
549 spin_lock(&xencons_lock);
550 list_del(&info->list);
551 spin_unlock(&xencons_lock);
552 if (info->irq)
553 unbind_from_irqhandler(info->irq, NULL);
554 kfree(info);
555 return r;
556 }
557
558 r = 0;
559#ifdef CONFIG_HVC_XEN_FRONTEND
560 r = xenbus_register_frontend(&xencons_driver);
561#endif
562 return r;
563}
Paul Gortmaker4fedd0b2014-01-15 16:35:43 -0500564device_initcall(xen_hvc_init);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700565
566static int xen_cons_init(void)
567{
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000568 const struct hv_ops *ops;
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100569
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000570 if (!xen_domain())
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700571 return 0;
572
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100573 if (xen_initial_domain())
574 ops = &dom0_hvc_ops;
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000575 else {
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000576 int r;
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100577 ops = &domU_hvc_ops;
578
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000579 if (xen_hvm_domain())
580 r = xen_hvm_console_init();
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000581 else
Stefano Stabellini02e19f92012-01-30 16:02:31 +0000582 r = xen_pv_console_init();
583 if (r < 0)
584 return r;
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000585 }
586
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100587 hvc_instantiate(HVC_COOKIE, 0, ops);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700588 return 0;
589}
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700590console_initcall(xen_cons_init);
591
Jeremy Fitzhardinge0922abd2008-05-26 23:31:00 +0100592#ifdef CONFIG_EARLY_PRINTK
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700593static void xenboot_write_console(struct console *console, const char *string,
594 unsigned len)
595{
596 unsigned int linelen, off = 0;
597 const char *pos;
598
Stefano Stabellinieb5ef072012-01-27 18:31:36 +0000599 if (!xen_pv_domain())
600 return;
601
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100602 dom0_write_console(0, string, len);
Jeremy Fitzhardinge0922abd2008-05-26 23:31:00 +0100603
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100604 if (xen_initial_domain())
605 return;
606
607 domU_write_console(0, "(early) ", 8);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700608 while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
609 linelen = pos-string+off;
610 if (off + linelen > len)
611 break;
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100612 domU_write_console(0, string+off, linelen);
613 domU_write_console(0, "\r\n", 2);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700614 off += linelen + 1;
615 }
616 if (off < len)
Jeremy Fitzhardinge4fe7d5a2010-09-02 16:17:06 +0100617 domU_write_console(0, string+off, len-off);
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700618}
619
620struct console xenboot_console = {
621 .name = "xenboot",
622 .write = xenboot_write_console,
Jeremy Fitzhardinge0922abd2008-05-26 23:31:00 +0100623 .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
David Vrabela9fbf4d2013-10-01 19:00:49 +0100624 .index = -1,
Jeremy Fitzhardingeb536b4b2007-07-17 18:37:06 -0700625};
Jeremy Fitzhardinge0922abd2008-05-26 23:31:00 +0100626#endif /* CONFIG_EARLY_PRINTK */
Jeremy Fitzhardinge0acf10d2008-05-26 23:30:59 +0100627
628void xen_raw_console_write(const char *str)
629{
Konrad Rzeszutek Wilk04b772d2013-09-27 17:18:13 -0400630 ssize_t len = strlen(str);
631 int rc = 0;
632
633 if (xen_domain()) {
634 rc = dom0_write_console(0, str, len);
635#ifdef CONFIG_X86
636 if (rc == -ENOSYS && xen_hvm_domain())
637 goto outb_print;
638
639 } else if (xen_cpuid_base()) {
640 int i;
641outb_print:
642 for (i = 0; i < len; i++)
643 outb(str[i], 0xe9);
644#endif
645 }
Jeremy Fitzhardinge0acf10d2008-05-26 23:30:59 +0100646}
647
648void xen_raw_printk(const char *fmt, ...)
649{
650 static char buf[512];
651 va_list ap;
652
653 va_start(ap, fmt);
654 vsnprintf(buf, sizeof(buf), fmt, ap);
655 va_end(ap);
656
657 xen_raw_console_write(buf);
658}