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1/*
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>
24#include <linux/init.h>
25#include <linux/types.h>
26
27#include <asm/xen/hypervisor.h>
28
29#include <xen/xen.h>
30#include <xen/page.h>
31#include <xen/events.h>
32#include <xen/interface/io/console.h>
33#include <xen/hvc-console.h>
34
35#include "hvc_console.h"
36
37#define HVC_COOKIE 0x58656e /* "Xen" in hex */
38
39static struct hvc_struct *hvc;
40static int xencons_irq;
41
42/* ------------------------------------------------------------------ */
43
44static unsigned long console_pfn = ~0ul;
45
46static inline struct xencons_interface *xencons_interface(void)
47{
48 if (console_pfn == ~0ul)
49 return mfn_to_virt(xen_start_info->console.domU.mfn);
50 else
51 return __va(console_pfn << PAGE_SHIFT);
52}
53
54static inline void notify_daemon(void)
55{
56 /* Use evtchn: this is called early, before irq is set up. */
57 notify_remote_via_evtchn(xen_start_info->console.domU.evtchn);
58}
59
60static int __write_console(const char *data, int len)
61{
62 struct xencons_interface *intf = xencons_interface();
63 XENCONS_RING_IDX cons, prod;
64 int sent = 0;
65
66 cons = intf->out_cons;
67 prod = intf->out_prod;
68 mb(); /* update queue values before going on */
69 BUG_ON((prod - cons) > sizeof(intf->out));
70
71 while ((sent < len) && ((prod - cons) < sizeof(intf->out)))
72 intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++];
73
74 wmb(); /* write ring before updating pointer */
75 intf->out_prod = prod;
76
77 if (sent)
78 notify_daemon();
79 return sent;
80}
81
82static int domU_write_console(uint32_t vtermno, const char *data, int len)
83{
84 int ret = len;
85
86 /*
87 * Make sure the whole buffer is emitted, polling if
88 * necessary. We don't ever want to rely on the hvc daemon
89 * because the most interesting console output is when the
90 * kernel is crippled.
91 */
92 while (len) {
93 int sent = __write_console(data, len);
94
95 data += sent;
96 len -= sent;
97
98 if (unlikely(len))
99 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
100 }
101
102 return ret;
103}
104
105static int domU_read_console(uint32_t vtermno, char *buf, int len)
106{
107 struct xencons_interface *intf = xencons_interface();
108 XENCONS_RING_IDX cons, prod;
109 int recv = 0;
110
111 cons = intf->in_cons;
112 prod = intf->in_prod;
113 mb(); /* get pointers before reading ring */
114 BUG_ON((prod - cons) > sizeof(intf->in));
115
116 while (cons != prod && recv < len)
117 buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)];
118
119 mb(); /* read ring before consuming */
120 intf->in_cons = cons;
121
122 notify_daemon();
123 return recv;
124}
125
126static struct hv_ops domU_hvc_ops = {
127 .get_chars = domU_read_console,
128 .put_chars = domU_write_console,
129 .notifier_add = notifier_add_irq,
130 .notifier_del = notifier_del_irq,
131 .notifier_hangup = notifier_hangup_irq,
132};
133
134static int dom0_read_console(uint32_t vtermno, char *buf, int len)
135{
136 return HYPERVISOR_console_io(CONSOLEIO_read, len, buf);
137}
138
139/*
140 * Either for a dom0 to write to the system console, or a domU with a
141 * debug version of Xen
142 */
143static int dom0_write_console(uint32_t vtermno, const char *str, int len)
144{
145 int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
146 if (rc < 0)
147 return 0;
148
149 return len;
150}
151
152static struct hv_ops dom0_hvc_ops = {
153 .get_chars = dom0_read_console,
154 .put_chars = dom0_write_console,
155 .notifier_add = notifier_add_irq,
156 .notifier_del = notifier_del_irq,
157 .notifier_hangup = notifier_hangup_irq,
158};
159
160static int __init xen_hvc_init(void)
161{
162 struct hvc_struct *hp;
163 struct hv_ops *ops;
164
165 if (!xen_pv_domain())
166 return -ENODEV;
167
168 if (xen_initial_domain()) {
169 ops = &dom0_hvc_ops;
170 xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
171 } else {
172 if (!xen_start_info->console.domU.evtchn)
173 return -ENODEV;
174
175 ops = &domU_hvc_ops;
176 xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
177 }
178 if (xencons_irq < 0)
179 xencons_irq = 0; /* NO_IRQ */
180 else
181 irq_set_noprobe(xencons_irq);
182
183 hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256);
184 if (IS_ERR(hp))
185 return PTR_ERR(hp);
186
187 hvc = hp;
188
189 console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
190
191 return 0;
192}
193
194void xen_console_resume(void)
195{
196 if (xencons_irq)
197 rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq);
198}
199
200static void __exit xen_hvc_fini(void)
201{
202 if (hvc)
203 hvc_remove(hvc);
204}
205
206static int xen_cons_init(void)
207{
208 struct hv_ops *ops;
209
210 if (!xen_pv_domain())
211 return 0;
212
213 if (xen_initial_domain())
214 ops = &dom0_hvc_ops;
215 else
216 ops = &domU_hvc_ops;
217
218 hvc_instantiate(HVC_COOKIE, 0, ops);
219 return 0;
220}
221
222module_init(xen_hvc_init);
223module_exit(xen_hvc_fini);
224console_initcall(xen_cons_init);
225
226#ifdef CONFIG_EARLY_PRINTK
227static void xenboot_write_console(struct console *console, const char *string,
228 unsigned len)
229{
230 unsigned int linelen, off = 0;
231 const char *pos;
232
233 dom0_write_console(0, string, len);
234
235 if (xen_initial_domain())
236 return;
237
238 domU_write_console(0, "(early) ", 8);
239 while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
240 linelen = pos-string+off;
241 if (off + linelen > len)
242 break;
243 domU_write_console(0, string+off, linelen);
244 domU_write_console(0, "\r\n", 2);
245 off += linelen + 1;
246 }
247 if (off < len)
248 domU_write_console(0, string+off, len-off);
249}
250
251struct console xenboot_console = {
252 .name = "xenboot",
253 .write = xenboot_write_console,
254 .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
255};
256#endif /* CONFIG_EARLY_PRINTK */
257
258void xen_raw_console_write(const char *str)
259{
260 dom0_write_console(0, str, strlen(str));
261}
262
263void xen_raw_printk(const char *fmt, ...)
264{
265 static char buf[512];
266 va_list ap;
267
268 va_start(ap, fmt);
269 vsnprintf(buf, sizeof(buf), fmt, ap);
270 va_end(ap);
271
272 xen_raw_console_write(buf);
273}
1/*
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>
24#include <linux/irq.h>
25#include <linux/init.h>
26#include <linux/types.h>
27#include <linux/list.h>
28
29#include <asm/io.h>
30#include <asm/xen/hypervisor.h>
31
32#include <xen/xen.h>
33#include <xen/interface/xen.h>
34#include <xen/hvm.h>
35#include <xen/grant_table.h>
36#include <xen/page.h>
37#include <xen/events.h>
38#include <xen/interface/io/console.h>
39#include <xen/interface/sched.h>
40#include <xen/hvc-console.h>
41#include <xen/xenbus.h>
42
43#include "hvc_console.h"
44
45#define HVC_COOKIE 0x58656e /* "Xen" in hex */
46
47struct 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);
60
61/* ------------------------------------------------------------------ */
62
63static struct xencons_info *vtermno_to_xencons(int vtermno)
64{
65 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;
78}
79
80static 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)
86{
87 /* Use evtchn: this is called early, before irq is set up. */
88 notify_remote_via_evtchn(cons->evtchn);
89}
90
91static int __write_console(struct xencons_info *xencons,
92 const char *data, int len)
93{
94 XENCONS_RING_IDX cons, prod;
95 struct xencons_interface *intf = xencons->intf;
96 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
109 if (sent)
110 notify_daemon(xencons);
111 return sent;
112}
113
114static int domU_write_console(uint32_t vtermno, const char *data, int len)
115{
116 int ret = len;
117 struct xencons_info *cons = vtermno_to_xencons(vtermno);
118 if (cons == NULL)
119 return -EINVAL;
120
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) {
128 int sent = __write_console(cons, data, len);
129
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
140static int domU_read_console(uint32_t vtermno, char *buf, int len)
141{
142 struct xencons_interface *intf;
143 XENCONS_RING_IDX cons, prod;
144 int recv = 0;
145 struct xencons_info *xencons = vtermno_to_xencons(vtermno);
146 if (xencons == NULL)
147 return -EINVAL;
148 intf = xencons->intf;
149
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
161 notify_daemon(xencons);
162 return recv;
163}
164
165static struct hv_ops domU_hvc_ops = {
166 .get_chars = domU_read_console,
167 .put_chars = domU_write_console,
168 .notifier_add = notifier_add_irq,
169 .notifier_del = notifier_del_irq,
170 .notifier_hangup = notifier_hangup_irq,
171};
172
173static 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)
186 return rc;
187
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
199static int xen_hvm_console_init(void)
200{
201 int r;
202 uint64_t v = 0;
203 unsigned long mfn;
204 struct xencons_info *info;
205
206 if (!xen_hvm_domain())
207 return -ENODEV;
208
209 info = vtermno_to_xencons(HVC_COOKIE);
210 if (!info) {
211 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
212 if (!info)
213 return -ENOMEM;
214 } else if (info->intf != NULL) {
215 /* already configured */
216 return 0;
217 }
218 /*
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 */
224 r = hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN, &v);
225 if (r < 0 || v == 0)
226 goto err;
227 info->evtchn = v;
228 v = 0;
229 r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
230 if (r < 0 || v == 0)
231 goto err;
232 mfn = v;
233 info->intf = xen_remap(mfn << PAGE_SHIFT, PAGE_SIZE);
234 if (info->intf == NULL)
235 goto err;
236 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;
243err:
244 kfree(info);
245 return -ENODEV;
246}
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) {
260 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
261 if (!info)
262 return -ENOMEM;
263 } else if (info->intf != NULL) {
264 /* already configured */
265 return 0;
266 }
267 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) {
287 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
288 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);
298
299 return 0;
300}
301
302void xen_console_resume(void)
303{
304 struct xencons_info *info = vtermno_to_xencons(HVC_COOKIE);
305 if (info != NULL && info->irq)
306 rebind_evtchn_irq(info->evtchn, info->irq);
307}
308
309static 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
349#ifdef CONFIG_HVC_XEN_FRONTEND
350static struct xenbus_driver xencons_driver;
351
352static 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
425static int xencons_probe(struct xenbus_device *dev,
426 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
435 info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
436 if (!info)
437 return -ENOMEM;
438 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:
481 break;
482
483 case XenbusStateInitWait:
484 break;
485
486 case XenbusStateConnected:
487 xenbus_switch_state(dev, XenbusStateConnected);
488 break;
489
490 case XenbusStateClosed:
491 if (dev->state == XenbusStateClosed)
492 break;
493 /* Missed the backend's CLOSING state -- fallthrough */
494 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
506static 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}
564device_initcall(xen_hvc_init);
565
566static int xen_cons_init(void)
567{
568 const struct hv_ops *ops;
569
570 if (!xen_domain())
571 return 0;
572
573 if (xen_initial_domain())
574 ops = &dom0_hvc_ops;
575 else {
576 int r;
577 ops = &domU_hvc_ops;
578
579 if (xen_hvm_domain())
580 r = xen_hvm_console_init();
581 else
582 r = xen_pv_console_init();
583 if (r < 0)
584 return r;
585 }
586
587 hvc_instantiate(HVC_COOKIE, 0, ops);
588 return 0;
589}
590console_initcall(xen_cons_init);
591
592#ifdef CONFIG_EARLY_PRINTK
593static 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
599 if (!xen_pv_domain())
600 return;
601
602 dom0_write_console(0, string, len);
603
604 if (xen_initial_domain())
605 return;
606
607 domU_write_console(0, "(early) ", 8);
608 while (off < len && NULL != (pos = strchr(string+off, '\n'))) {
609 linelen = pos-string+off;
610 if (off + linelen > len)
611 break;
612 domU_write_console(0, string+off, linelen);
613 domU_write_console(0, "\r\n", 2);
614 off += linelen + 1;
615 }
616 if (off < len)
617 domU_write_console(0, string+off, len-off);
618}
619
620struct console xenboot_console = {
621 .name = "xenboot",
622 .write = xenboot_write_console,
623 .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
624 .index = -1,
625};
626#endif /* CONFIG_EARLY_PRINTK */
627
628void xen_raw_console_write(const char *str)
629{
630 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 }
646}
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}