1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/cdev.h>
21#include <linux/debugfs.h>
22#include <linux/completion.h>
23#include <linux/device.h>
24#include <linux/err.h>
25#include <linux/freezer.h>
26#include <linux/fs.h>
27#include <linux/splice.h>
28#include <linux/pagemap.h>
29#include <linux/init.h>
30#include <linux/list.h>
31#include <linux/poll.h>
32#include <linux/sched.h>
33#include <linux/slab.h>
34#include <linux/spinlock.h>
35#include <linux/virtio.h>
36#include <linux/virtio_console.h>
37#include <linux/wait.h>
38#include <linux/workqueue.h>
39#include <linux/module.h>
40#include <linux/dma-mapping.h>
41#include <linux/kconfig.h>
42#include "../tty/hvc/hvc_console.h"
43
44#define is_rproc_enabled IS_ENABLED(CONFIG_REMOTEPROC)
45
46
47
48
49
50
51
52
53
54struct ports_driver_data {
55
56 struct class *class;
57
58
59 struct dentry *debugfs_dir;
60
61
62 struct list_head portdevs;
63
64
65
66
67
68
69
70
71
72
73
74 unsigned int next_vtermno;
75
76
77 struct list_head consoles;
78};
79static struct ports_driver_data pdrvdata;
80
81static DEFINE_SPINLOCK(pdrvdata_lock);
82static DECLARE_COMPLETION(early_console_added);
83
84
85struct console {
86
87 struct list_head list;
88
89
90 struct hvc_struct *hvc;
91
92
93 struct winsize ws;
94
95
96
97
98
99
100
101
102 u32 vtermno;
103};
104
105struct port_buffer {
106 char *buf;
107
108
109 size_t size;
110
111
112 size_t len;
113
114 size_t offset;
115
116
117 dma_addr_t dma;
118
119
120 struct device *dev;
121
122
123 struct list_head list;
124
125
126 unsigned int sgpages;
127
128
129 struct scatterlist sg[0];
130};
131
132
133
134
135
136struct ports_device {
137
138 struct list_head list;
139
140
141
142
143
144 struct work_struct control_work;
145 struct work_struct config_work;
146
147 struct list_head ports;
148
149
150 spinlock_t ports_lock;
151
152
153 spinlock_t c_ivq_lock;
154 spinlock_t c_ovq_lock;
155
156
157 struct virtio_console_config config;
158
159
160 struct virtio_device *vdev;
161
162
163
164
165
166 struct virtqueue *c_ivq, *c_ovq;
167
168
169 struct virtqueue **in_vqs, **out_vqs;
170
171
172 int chr_major;
173};
174
175struct port_stats {
176 unsigned long bytes_sent, bytes_received, bytes_discarded;
177};
178
179
180struct port {
181
182 struct list_head list;
183
184
185 struct ports_device *portdev;
186
187
188 struct port_buffer *inbuf;
189
190
191
192
193
194
195 spinlock_t inbuf_lock;
196
197
198 spinlock_t outvq_lock;
199
200
201 struct virtqueue *in_vq, *out_vq;
202
203
204 struct dentry *debugfs_file;
205
206
207
208
209
210
211 struct port_stats stats;
212
213
214
215
216
217 struct console cons;
218
219
220 struct cdev *cdev;
221 struct device *dev;
222
223
224 struct kref kref;
225
226
227 wait_queue_head_t waitqueue;
228
229
230 char *name;
231
232
233 struct fasync_struct *async_queue;
234
235
236 u32 id;
237
238 bool outvq_full;
239
240
241 bool host_connected;
242
243
244 bool guest_connected;
245};
246
247
248static int (*early_put_chars)(u32, const char *, int);
249
250static struct port *find_port_by_vtermno(u32 vtermno)
251{
252 struct port *port;
253 struct console *cons;
254 unsigned long flags;
255
256 spin_lock_irqsave(&pdrvdata_lock, flags);
257 list_for_each_entry(cons, &pdrvdata.consoles, list) {
258 if (cons->vtermno == vtermno) {
259 port = container_of(cons, struct port, cons);
260 goto out;
261 }
262 }
263 port = NULL;
264out:
265 spin_unlock_irqrestore(&pdrvdata_lock, flags);
266 return port;
267}
268
269static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev,
270 dev_t dev)
271{
272 struct port *port;
273 unsigned long flags;
274
275 spin_lock_irqsave(&portdev->ports_lock, flags);
276 list_for_each_entry(port, &portdev->ports, list) {
277 if (port->cdev->dev == dev) {
278 kref_get(&port->kref);
279 goto out;
280 }
281 }
282 port = NULL;
283out:
284 spin_unlock_irqrestore(&portdev->ports_lock, flags);
285
286 return port;
287}
288
289static struct port *find_port_by_devt(dev_t dev)
290{
291 struct ports_device *portdev;
292 struct port *port;
293 unsigned long flags;
294
295 spin_lock_irqsave(&pdrvdata_lock, flags);
296 list_for_each_entry(portdev, &pdrvdata.portdevs, list) {
297 port = find_port_by_devt_in_portdev(portdev, dev);
298 if (port)
299 goto out;
300 }
301 port = NULL;
302out:
303 spin_unlock_irqrestore(&pdrvdata_lock, flags);
304 return port;
305}
306
307static struct port *find_port_by_id(struct ports_device *portdev, u32 id)
308{
309 struct port *port;
310 unsigned long flags;
311
312 spin_lock_irqsave(&portdev->ports_lock, flags);
313 list_for_each_entry(port, &portdev->ports, list)
314 if (port->id == id)
315 goto out;
316 port = NULL;
317out:
318 spin_unlock_irqrestore(&portdev->ports_lock, flags);
319
320 return port;
321}
322
323static struct port *find_port_by_vq(struct ports_device *portdev,
324 struct virtqueue *vq)
325{
326 struct port *port;
327 unsigned long flags;
328
329 spin_lock_irqsave(&portdev->ports_lock, flags);
330 list_for_each_entry(port, &portdev->ports, list)
331 if (port->in_vq == vq || port->out_vq == vq)
332 goto out;
333 port = NULL;
334out:
335 spin_unlock_irqrestore(&portdev->ports_lock, flags);
336 return port;
337}
338
339static bool is_console_port(struct port *port)
340{
341 if (port->cons.hvc)
342 return true;
343 return false;
344}
345
346static bool is_rproc_serial(const struct virtio_device *vdev)
347{
348 return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL;
349}
350
351static inline bool use_multiport(struct ports_device *portdev)
352{
353
354
355
356
357 if (!portdev->vdev)
358 return false;
359 return __virtio_test_bit(portdev->vdev, VIRTIO_CONSOLE_F_MULTIPORT);
360}
361
362static DEFINE_SPINLOCK(dma_bufs_lock);
363static LIST_HEAD(pending_free_dma_bufs);
364
365static void free_buf(struct port_buffer *buf, bool can_sleep)
366{
367 unsigned int i;
368
369 for (i = 0; i < buf->sgpages; i++) {
370 struct page *page = sg_page(&buf->sg[i]);
371 if (!page)
372 break;
373 put_page(page);
374 }
375
376 if (!buf->dev) {
377 kfree(buf->buf);
378 } else if (is_rproc_enabled) {
379 unsigned long flags;
380
381
382 if (!can_sleep) {
383
384 spin_lock_irqsave(&dma_bufs_lock, flags);
385 list_add_tail(&buf->list, &pending_free_dma_bufs);
386 spin_unlock_irqrestore(&dma_bufs_lock, flags);
387 return;
388 }
389 dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma);
390
391
392 put_device(buf->dev);
393 }
394
395 kfree(buf);
396}
397
398static void reclaim_dma_bufs(void)
399{
400 unsigned long flags;
401 struct port_buffer *buf, *tmp;
402 LIST_HEAD(tmp_list);
403
404 if (list_empty(&pending_free_dma_bufs))
405 return;
406
407
408 spin_lock_irqsave(&dma_bufs_lock, flags);
409 list_cut_position(&tmp_list, &pending_free_dma_bufs,
410 pending_free_dma_bufs.prev);
411 spin_unlock_irqrestore(&dma_bufs_lock, flags);
412
413
414 list_for_each_entry_safe(buf, tmp, &tmp_list, list) {
415 list_del(&buf->list);
416 free_buf(buf, true);
417 }
418}
419
420static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size,
421 int pages)
422{
423 struct port_buffer *buf;
424
425 reclaim_dma_bufs();
426
427
428
429
430
431 buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages,
432 GFP_KERNEL);
433 if (!buf)
434 goto fail;
435
436 buf->sgpages = pages;
437 if (pages > 0) {
438 buf->dev = NULL;
439 buf->buf = NULL;
440 return buf;
441 }
442
443 if (is_rproc_serial(vq->vdev)) {
444
445
446
447
448
449
450
451
452
453 if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent)
454 goto free_buf;
455 buf->dev = vq->vdev->dev.parent->parent;
456
457
458 get_device(buf->dev);
459 buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma,
460 GFP_KERNEL);
461 } else {
462 buf->dev = NULL;
463 buf->buf = kmalloc(buf_size, GFP_KERNEL);
464 }
465
466 if (!buf->buf)
467 goto free_buf;
468 buf->len = 0;
469 buf->offset = 0;
470 buf->size = buf_size;
471 return buf;
472
473free_buf:
474 kfree(buf);
475fail:
476 return NULL;
477}
478
479
480static struct port_buffer *get_inbuf(struct port *port)
481{
482 struct port_buffer *buf;
483 unsigned int len;
484
485 if (port->inbuf)
486 return port->inbuf;
487
488 buf = virtqueue_get_buf(port->in_vq, &len);
489 if (buf) {
490 buf->len = len;
491 buf->offset = 0;
492 port->stats.bytes_received += len;
493 }
494 return buf;
495}
496
497
498
499
500
501
502
503static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
504{
505 struct scatterlist sg[1];
506 int ret;
507
508 sg_init_one(sg, buf->buf, buf->size);
509
510 ret = virtqueue_add_inbuf(vq, sg, 1, buf, GFP_ATOMIC);
511 virtqueue_kick(vq);
512 if (!ret)
513 ret = vq->num_free;
514 return ret;
515}
516
517
518static void discard_port_data(struct port *port)
519{
520 struct port_buffer *buf;
521 unsigned int err;
522
523 if (!port->portdev) {
524
525 return;
526 }
527 buf = get_inbuf(port);
528
529 err = 0;
530 while (buf) {
531 port->stats.bytes_discarded += buf->len - buf->offset;
532 if (add_inbuf(port->in_vq, buf) < 0) {
533 err++;
534 free_buf(buf, false);
535 }
536 port->inbuf = NULL;
537 buf = get_inbuf(port);
538 }
539 if (err)
540 dev_warn(port->dev, "Errors adding %d buffers back to vq\n",
541 err);
542}
543
544static bool port_has_data(struct port *port)
545{
546 unsigned long flags;
547 bool ret;
548
549 ret = false;
550 spin_lock_irqsave(&port->inbuf_lock, flags);
551 port->inbuf = get_inbuf(port);
552 if (port->inbuf)
553 ret = true;
554
555 spin_unlock_irqrestore(&port->inbuf_lock, flags);
556 return ret;
557}
558
559static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
560 unsigned int event, unsigned int value)
561{
562 struct scatterlist sg[1];
563 struct virtio_console_control cpkt;
564 struct virtqueue *vq;
565 unsigned int len;
566
567 if (!use_multiport(portdev))
568 return 0;
569
570 cpkt.id = cpu_to_virtio32(portdev->vdev, port_id);
571 cpkt.event = cpu_to_virtio16(portdev->vdev, event);
572 cpkt.value = cpu_to_virtio16(portdev->vdev, value);
573
574 vq = portdev->c_ovq;
575
576 sg_init_one(sg, &cpkt, sizeof(cpkt));
577
578 spin_lock(&portdev->c_ovq_lock);
579 if (virtqueue_add_outbuf(vq, sg, 1, &cpkt, GFP_ATOMIC) == 0) {
580 virtqueue_kick(vq);
581 while (!virtqueue_get_buf(vq, &len)
582 && !virtqueue_is_broken(vq))
583 cpu_relax();
584 }
585 spin_unlock(&portdev->c_ovq_lock);
586 return 0;
587}
588
589static ssize_t send_control_msg(struct port *port, unsigned int event,
590 unsigned int value)
591{
592
593 if (port->portdev)
594 return __send_control_msg(port->portdev, port->id, event, value);
595 return 0;
596}
597
598
599
600static void reclaim_consumed_buffers(struct port *port)
601{
602 struct port_buffer *buf;
603 unsigned int len;
604
605 if (!port->portdev) {
606
607 return;
608 }
609 while ((buf = virtqueue_get_buf(port->out_vq, &len))) {
610 free_buf(buf, false);
611 port->outvq_full = false;
612 }
613}
614
615static ssize_t __send_to_port(struct port *port, struct scatterlist *sg,
616 int nents, size_t in_count,
617 void *data, bool nonblock)
618{
619 struct virtqueue *out_vq;
620 int err;
621 unsigned long flags;
622 unsigned int len;
623
624 out_vq = port->out_vq;
625
626 spin_lock_irqsave(&port->outvq_lock, flags);
627
628 reclaim_consumed_buffers(port);
629
630 err = virtqueue_add_outbuf(out_vq, sg, nents, data, GFP_ATOMIC);
631
632
633 virtqueue_kick(out_vq);
634
635 if (err) {
636 in_count = 0;
637 goto done;
638 }
639
640 if (out_vq->num_free == 0)
641 port->outvq_full = true;
642
643 if (nonblock)
644 goto done;
645
646
647
648
649
650
651
652
653
654
655 while (!virtqueue_get_buf(out_vq, &len)
656 && !virtqueue_is_broken(out_vq))
657 cpu_relax();
658done:
659 spin_unlock_irqrestore(&port->outvq_lock, flags);
660
661 port->stats.bytes_sent += in_count;
662
663
664
665
666 return in_count;
667}
668
669
670
671
672
673static ssize_t fill_readbuf(struct port *port, char __user *out_buf,
674 size_t out_count, bool to_user)
675{
676 struct port_buffer *buf;
677 unsigned long flags;
678
679 if (!out_count || !port_has_data(port))
680 return 0;
681
682 buf = port->inbuf;
683 out_count = min(out_count, buf->len - buf->offset);
684
685 if (to_user) {
686 ssize_t ret;
687
688 ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count);
689 if (ret)
690 return -EFAULT;
691 } else {
692 memcpy((__force char *)out_buf, buf->buf + buf->offset,
693 out_count);
694 }
695
696 buf->offset += out_count;
697
698 if (buf->offset == buf->len) {
699
700
701
702
703 spin_lock_irqsave(&port->inbuf_lock, flags);
704 port->inbuf = NULL;
705
706 if (add_inbuf(port->in_vq, buf) < 0)
707 dev_warn(port->dev, "failed add_buf\n");
708
709 spin_unlock_irqrestore(&port->inbuf_lock, flags);
710 }
711
712 return out_count;
713}
714
715
716static bool will_read_block(struct port *port)
717{
718 if (!port->guest_connected) {
719
720 return false;
721 }
722 return !port_has_data(port) && port->host_connected;
723}
724
725static bool will_write_block(struct port *port)
726{
727 bool ret;
728
729 if (!port->guest_connected) {
730
731 return false;
732 }
733 if (!port->host_connected)
734 return true;
735
736 spin_lock_irq(&port->outvq_lock);
737
738
739
740
741 reclaim_consumed_buffers(port);
742 ret = port->outvq_full;
743 spin_unlock_irq(&port->outvq_lock);
744
745 return ret;
746}
747
748static ssize_t port_fops_read(struct file *filp, char __user *ubuf,
749 size_t count, loff_t *offp)
750{
751 struct port *port;
752 ssize_t ret;
753
754 port = filp->private_data;
755
756
757 if (!port->guest_connected)
758 return -ENODEV;
759
760 if (!port_has_data(port)) {
761
762
763
764
765
766 if (!port->host_connected)
767 return 0;
768 if (filp->f_flags & O_NONBLOCK)
769 return -EAGAIN;
770
771 ret = wait_event_freezable(port->waitqueue,
772 !will_read_block(port));
773 if (ret < 0)
774 return ret;
775 }
776
777 if (!port->guest_connected)
778 return -ENODEV;
779
780
781
782
783
784
785
786
787
788
789 if (!port_has_data(port) && !port->host_connected)
790 return 0;
791
792 return fill_readbuf(port, ubuf, count, true);
793}
794
795static int wait_port_writable(struct port *port, bool nonblock)
796{
797 int ret;
798
799 if (will_write_block(port)) {
800 if (nonblock)
801 return -EAGAIN;
802
803 ret = wait_event_freezable(port->waitqueue,
804 !will_write_block(port));
805 if (ret < 0)
806 return ret;
807 }
808
809 if (!port->guest_connected)
810 return -ENODEV;
811
812 return 0;
813}
814
815static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
816 size_t count, loff_t *offp)
817{
818 struct port *port;
819 struct port_buffer *buf;
820 ssize_t ret;
821 bool nonblock;
822 struct scatterlist sg[1];
823
824
825 if (!count)
826 return 0;
827
828 port = filp->private_data;
829
830 nonblock = filp->f_flags & O_NONBLOCK;
831
832 ret = wait_port_writable(port, nonblock);
833 if (ret < 0)
834 return ret;
835
836 count = min((size_t)(32 * 1024), count);
837
838 buf = alloc_buf(port->out_vq, count, 0);
839 if (!buf)
840 return -ENOMEM;
841
842 ret = copy_from_user(buf->buf, ubuf, count);
843 if (ret) {
844 ret = -EFAULT;
845 goto free_buf;
846 }
847
848
849
850
851
852
853
854
855 nonblock = true;
856 sg_init_one(sg, buf->buf, count);
857 ret = __send_to_port(port, sg, 1, count, buf, nonblock);
858
859 if (nonblock && ret > 0)
860 goto out;
861
862free_buf:
863 free_buf(buf, true);
864out:
865 return ret;
866}
867
868struct sg_list {
869 unsigned int n;
870 unsigned int size;
871 size_t len;
872 struct scatterlist *sg;
873};
874
875static int pipe_to_sg(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
876 struct splice_desc *sd)
877{
878 struct sg_list *sgl = sd->u.data;
879 unsigned int offset, len;
880
881 if (sgl->n == sgl->size)
882 return 0;
883
884
885 if (buf->ops->steal(pipe, buf) == 0) {
886
887 get_page(buf->page);
888 unlock_page(buf->page);
889
890 len = min(buf->len, sd->len);
891 sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset);
892 } else {
893
894 struct page *page = alloc_page(GFP_KERNEL);
895 char *src;
896
897 if (!page)
898 return -ENOMEM;
899
900 offset = sd->pos & ~PAGE_MASK;
901
902 len = sd->len;
903 if (len + offset > PAGE_SIZE)
904 len = PAGE_SIZE - offset;
905
906 src = kmap_atomic(buf->page);
907 memcpy(page_address(page) + offset, src + buf->offset, len);
908 kunmap_atomic(src);
909
910 sg_set_page(&(sgl->sg[sgl->n]), page, len, offset);
911 }
912 sgl->n++;
913 sgl->len += len;
914
915 return len;
916}
917
918
919static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe,
920 struct file *filp, loff_t *ppos,
921 size_t len, unsigned int flags)
922{
923 struct port *port = filp->private_data;
924 struct sg_list sgl;
925 ssize_t ret;
926 struct port_buffer *buf;
927 struct splice_desc sd = {
928 .total_len = len,
929 .flags = flags,
930 .pos = *ppos,
931 .u.data = &sgl,
932 };
933
934
935
936
937
938
939
940 if (is_rproc_serial(port->out_vq->vdev))
941 return -EINVAL;
942
943
944
945
946
947 pipe_lock(pipe);
948 if (!pipe->nrbufs) {
949 ret = 0;
950 goto error_out;
951 }
952
953 ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK);
954 if (ret < 0)
955 goto error_out;
956
957 buf = alloc_buf(port->out_vq, 0, pipe->nrbufs);
958 if (!buf) {
959 ret = -ENOMEM;
960 goto error_out;
961 }
962
963 sgl.n = 0;
964 sgl.len = 0;
965 sgl.size = pipe->nrbufs;
966 sgl.sg = buf->sg;
967 sg_init_table(sgl.sg, sgl.size);
968 ret = __splice_from_pipe(pipe, &sd, pipe_to_sg);
969 pipe_unlock(pipe);
970 if (likely(ret > 0))
971 ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true);
972
973 if (unlikely(ret <= 0))
974 free_buf(buf, true);
975 return ret;
976
977error_out:
978 pipe_unlock(pipe);
979 return ret;
980}
981
982static unsigned int port_fops_poll(struct file *filp, poll_table *wait)
983{
984 struct port *port;
985 unsigned int ret;
986
987 port = filp->private_data;
988 poll_wait(filp, &port->waitqueue, wait);
989
990 if (!port->guest_connected) {
991
992 return POLLHUP;
993 }
994 ret = 0;
995 if (!will_read_block(port))
996 ret |= POLLIN | POLLRDNORM;
997 if (!will_write_block(port))
998 ret |= POLLOUT;
999 if (!port->host_connected)
1000 ret |= POLLHUP;
1001
1002 return ret;
1003}
1004
1005static void remove_port(struct kref *kref);
1006
1007static int port_fops_release(struct inode *inode, struct file *filp)
1008{
1009 struct port *port;
1010
1011 port = filp->private_data;
1012
1013
1014 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
1015
1016 spin_lock_irq(&port->inbuf_lock);
1017 port->guest_connected = false;
1018
1019 discard_port_data(port);
1020
1021 spin_unlock_irq(&port->inbuf_lock);
1022
1023 spin_lock_irq(&port->outvq_lock);
1024 reclaim_consumed_buffers(port);
1025 spin_unlock_irq(&port->outvq_lock);
1026
1027 reclaim_dma_bufs();
1028
1029
1030
1031
1032
1033
1034
1035
1036 kref_put(&port->kref, remove_port);
1037
1038 return 0;
1039}
1040
1041static int port_fops_open(struct inode *inode, struct file *filp)
1042{
1043 struct cdev *cdev = inode->i_cdev;
1044 struct port *port;
1045 int ret;
1046
1047
1048 port = find_port_by_devt(cdev->dev);
1049 if (!port) {
1050
1051 return -ENXIO;
1052 }
1053 filp->private_data = port;
1054
1055
1056
1057
1058
1059 if (is_console_port(port)) {
1060 ret = -ENXIO;
1061 goto out;
1062 }
1063
1064
1065 spin_lock_irq(&port->inbuf_lock);
1066 if (port->guest_connected) {
1067 spin_unlock_irq(&port->inbuf_lock);
1068 ret = -EBUSY;
1069 goto out;
1070 }
1071
1072 port->guest_connected = true;
1073 spin_unlock_irq(&port->inbuf_lock);
1074
1075 spin_lock_irq(&port->outvq_lock);
1076
1077
1078
1079
1080
1081 reclaim_consumed_buffers(port);
1082 spin_unlock_irq(&port->outvq_lock);
1083
1084 nonseekable_open(inode, filp);
1085
1086
1087 send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1);
1088
1089 return 0;
1090out:
1091 kref_put(&port->kref, remove_port);
1092 return ret;
1093}
1094
1095static int port_fops_fasync(int fd, struct file *filp, int mode)
1096{
1097 struct port *port;
1098
1099 port = filp->private_data;
1100 return fasync_helper(fd, filp, mode, &port->async_queue);
1101}
1102
1103
1104
1105
1106
1107
1108
1109static const struct file_operations port_fops = {
1110 .owner = THIS_MODULE,
1111 .open = port_fops_open,
1112 .read = port_fops_read,
1113 .write = port_fops_write,
1114 .splice_write = port_fops_splice_write,
1115 .poll = port_fops_poll,
1116 .release = port_fops_release,
1117 .fasync = port_fops_fasync,
1118 .llseek = no_llseek,
1119};
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129static int put_chars(u32 vtermno, const char *buf, int count)
1130{
1131 struct port *port;
1132 struct scatterlist sg[1];
1133
1134 if (unlikely(early_put_chars))
1135 return early_put_chars(vtermno, buf, count);
1136
1137 port = find_port_by_vtermno(vtermno);
1138 if (!port)
1139 return -EPIPE;
1140
1141 sg_init_one(sg, buf, count);
1142 return __send_to_port(port, sg, 1, count, (void *)buf, false);
1143}
1144
1145
1146
1147
1148
1149
1150
1151
1152static int get_chars(u32 vtermno, char *buf, int count)
1153{
1154 struct port *port;
1155
1156
1157 if (unlikely(early_put_chars))
1158 return 0;
1159
1160 port = find_port_by_vtermno(vtermno);
1161 if (!port)
1162 return -EPIPE;
1163
1164
1165 BUG_ON(!port->in_vq);
1166
1167 return fill_readbuf(port, (__force char __user *)buf, count, false);
1168}
1169
1170static void resize_console(struct port *port)
1171{
1172 struct virtio_device *vdev;
1173
1174
1175 if (!port || !is_console_port(port))
1176 return;
1177
1178 vdev = port->portdev->vdev;
1179
1180
1181 if (!is_rproc_serial(vdev) &&
1182 virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE))
1183 hvc_resize(port->cons.hvc, port->cons.ws);
1184}
1185
1186
1187static int notifier_add_vio(struct hvc_struct *hp, int data)
1188{
1189 struct port *port;
1190
1191 port = find_port_by_vtermno(hp->vtermno);
1192 if (!port)
1193 return -EINVAL;
1194
1195 hp->irq_requested = 1;
1196 resize_console(port);
1197
1198 return 0;
1199}
1200
1201static void notifier_del_vio(struct hvc_struct *hp, int data)
1202{
1203 hp->irq_requested = 0;
1204}
1205
1206
1207static const struct hv_ops hv_ops = {
1208 .get_chars = get_chars,
1209 .put_chars = put_chars,
1210 .notifier_add = notifier_add_vio,
1211 .notifier_del = notifier_del_vio,
1212 .notifier_hangup = notifier_del_vio,
1213};
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int))
1225{
1226 early_put_chars = put_chars;
1227 return hvc_instantiate(0, 0, &hv_ops);
1228}
1229
1230static int init_port_console(struct port *port)
1231{
1232 int ret;
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251 port->cons.vtermno = pdrvdata.next_vtermno;
1252
1253 port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE);
1254 if (IS_ERR(port->cons.hvc)) {
1255 ret = PTR_ERR(port->cons.hvc);
1256 dev_err(port->dev,
1257 "error %d allocating hvc for port\n", ret);
1258 port->cons.hvc = NULL;
1259 return ret;
1260 }
1261 spin_lock_irq(&pdrvdata_lock);
1262 pdrvdata.next_vtermno++;
1263 list_add_tail(&port->cons.list, &pdrvdata.consoles);
1264 spin_unlock_irq(&pdrvdata_lock);
1265 port->guest_connected = true;
1266
1267
1268
1269
1270
1271 if (early_put_chars)
1272 early_put_chars = NULL;
1273
1274
1275 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
1276
1277 return 0;
1278}
1279
1280static ssize_t show_port_name(struct device *dev,
1281 struct device_attribute *attr, char *buffer)
1282{
1283 struct port *port;
1284
1285 port = dev_get_drvdata(dev);
1286
1287 return sprintf(buffer, "%s\n", port->name);
1288}
1289
1290static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL);
1291
1292static struct attribute *port_sysfs_entries[] = {
1293 &dev_attr_name.attr,
1294 NULL
1295};
1296
1297static struct attribute_group port_attribute_group = {
1298 .name = NULL,
1299 .attrs = port_sysfs_entries,
1300};
1301
1302static ssize_t debugfs_read(struct file *filp, char __user *ubuf,
1303 size_t count, loff_t *offp)
1304{
1305 struct port *port;
1306 char *buf;
1307 ssize_t ret, out_offset, out_count;
1308
1309 out_count = 1024;
1310 buf = kmalloc(out_count, GFP_KERNEL);
1311 if (!buf)
1312 return -ENOMEM;
1313
1314 port = filp->private_data;
1315 out_offset = 0;
1316 out_offset += snprintf(buf + out_offset, out_count,
1317 "name: %s\n", port->name ? port->name : "");
1318 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1319 "guest_connected: %d\n", port->guest_connected);
1320 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1321 "host_connected: %d\n", port->host_connected);
1322 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1323 "outvq_full: %d\n", port->outvq_full);
1324 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1325 "bytes_sent: %lu\n", port->stats.bytes_sent);
1326 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1327 "bytes_received: %lu\n",
1328 port->stats.bytes_received);
1329 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1330 "bytes_discarded: %lu\n",
1331 port->stats.bytes_discarded);
1332 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1333 "is_console: %s\n",
1334 is_console_port(port) ? "yes" : "no");
1335 out_offset += snprintf(buf + out_offset, out_count - out_offset,
1336 "console_vtermno: %u\n", port->cons.vtermno);
1337
1338 ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
1339 kfree(buf);
1340 return ret;
1341}
1342
1343static const struct file_operations port_debugfs_ops = {
1344 .owner = THIS_MODULE,
1345 .open = simple_open,
1346 .read = debugfs_read,
1347};
1348
1349static void set_console_size(struct port *port, u16 rows, u16 cols)
1350{
1351 if (!port || !is_console_port(port))
1352 return;
1353
1354 port->cons.ws.ws_row = rows;
1355 port->cons.ws.ws_col = cols;
1356}
1357
1358static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock)
1359{
1360 struct port_buffer *buf;
1361 unsigned int nr_added_bufs;
1362 int ret;
1363
1364 nr_added_bufs = 0;
1365 do {
1366 buf = alloc_buf(vq, PAGE_SIZE, 0);
1367 if (!buf)
1368 break;
1369
1370 spin_lock_irq(lock);
1371 ret = add_inbuf(vq, buf);
1372 if (ret < 0) {
1373 spin_unlock_irq(lock);
1374 free_buf(buf, true);
1375 break;
1376 }
1377 nr_added_bufs++;
1378 spin_unlock_irq(lock);
1379 } while (ret > 0);
1380
1381 return nr_added_bufs;
1382}
1383
1384static void send_sigio_to_port(struct port *port)
1385{
1386 if (port->async_queue && port->guest_connected)
1387 kill_fasync(&port->async_queue, SIGIO, POLL_OUT);
1388}
1389
1390static int add_port(struct ports_device *portdev, u32 id)
1391{
1392 char debugfs_name[16];
1393 struct port *port;
1394 struct port_buffer *buf;
1395 dev_t devt;
1396 unsigned int nr_added_bufs;
1397 int err;
1398
1399 port = kmalloc(sizeof(*port), GFP_KERNEL);
1400 if (!port) {
1401 err = -ENOMEM;
1402 goto fail;
1403 }
1404 kref_init(&port->kref);
1405
1406 port->portdev = portdev;
1407 port->id = id;
1408
1409 port->name = NULL;
1410 port->inbuf = NULL;
1411 port->cons.hvc = NULL;
1412 port->async_queue = NULL;
1413
1414 port->cons.ws.ws_row = port->cons.ws.ws_col = 0;
1415
1416 port->host_connected = port->guest_connected = false;
1417 port->stats = (struct port_stats) { 0 };
1418
1419 port->outvq_full = false;
1420
1421 port->in_vq = portdev->in_vqs[port->id];
1422 port->out_vq = portdev->out_vqs[port->id];
1423
1424 port->cdev = cdev_alloc();
1425 if (!port->cdev) {
1426 dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n");
1427 err = -ENOMEM;
1428 goto free_port;
1429 }
1430 port->cdev->ops = &port_fops;
1431
1432 devt = MKDEV(portdev->chr_major, id);
1433 err = cdev_add(port->cdev, devt, 1);
1434 if (err < 0) {
1435 dev_err(&port->portdev->vdev->dev,
1436 "Error %d adding cdev for port %u\n", err, id);
1437 goto free_cdev;
1438 }
1439 port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev,
1440 devt, port, "vport%up%u",
1441 port->portdev->vdev->index, id);
1442 if (IS_ERR(port->dev)) {
1443 err = PTR_ERR(port->dev);
1444 dev_err(&port->portdev->vdev->dev,
1445 "Error %d creating device for port %u\n",
1446 err, id);
1447 goto free_cdev;
1448 }
1449
1450 spin_lock_init(&port->inbuf_lock);
1451 spin_lock_init(&port->outvq_lock);
1452 init_waitqueue_head(&port->waitqueue);
1453
1454
1455 nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock);
1456 if (!nr_added_bufs) {
1457 dev_err(port->dev, "Error allocating inbufs\n");
1458 err = -ENOMEM;
1459 goto free_device;
1460 }
1461
1462 if (is_rproc_serial(port->portdev->vdev))
1463
1464
1465
1466
1467
1468 port->host_connected = true;
1469 else if (!use_multiport(port->portdev)) {
1470
1471
1472
1473
1474 err = init_port_console(port);
1475 if (err)
1476 goto free_inbufs;
1477 }
1478
1479 spin_lock_irq(&portdev->ports_lock);
1480 list_add_tail(&port->list, &port->portdev->ports);
1481 spin_unlock_irq(&portdev->ports_lock);
1482
1483
1484
1485
1486
1487
1488 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
1489
1490 if (pdrvdata.debugfs_dir) {
1491
1492
1493
1494
1495 sprintf(debugfs_name, "vport%up%u",
1496 port->portdev->vdev->index, id);
1497 port->debugfs_file = debugfs_create_file(debugfs_name, 0444,
1498 pdrvdata.debugfs_dir,
1499 port,
1500 &port_debugfs_ops);
1501 }
1502 return 0;
1503
1504free_inbufs:
1505 while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
1506 free_buf(buf, true);
1507free_device:
1508 device_destroy(pdrvdata.class, port->dev->devt);
1509free_cdev:
1510 cdev_del(port->cdev);
1511free_port:
1512 kfree(port);
1513fail:
1514
1515 __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0);
1516 return err;
1517}
1518
1519
1520static void remove_port(struct kref *kref)
1521{
1522 struct port *port;
1523
1524 port = container_of(kref, struct port, kref);
1525
1526 kfree(port);
1527}
1528
1529static void remove_port_data(struct port *port)
1530{
1531 struct port_buffer *buf;
1532
1533 spin_lock_irq(&port->inbuf_lock);
1534
1535 discard_port_data(port);
1536
1537
1538 while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
1539 free_buf(buf, true);
1540 spin_unlock_irq(&port->inbuf_lock);
1541
1542 spin_lock_irq(&port->outvq_lock);
1543 reclaim_consumed_buffers(port);
1544
1545
1546 while ((buf = virtqueue_detach_unused_buf(port->out_vq)))
1547 free_buf(buf, true);
1548 spin_unlock_irq(&port->outvq_lock);
1549}
1550
1551
1552
1553
1554
1555
1556static void unplug_port(struct port *port)
1557{
1558 spin_lock_irq(&port->portdev->ports_lock);
1559 list_del(&port->list);
1560 spin_unlock_irq(&port->portdev->ports_lock);
1561
1562 spin_lock_irq(&port->inbuf_lock);
1563 if (port->guest_connected) {
1564
1565 send_sigio_to_port(port);
1566
1567
1568 port->guest_connected = false;
1569 port->host_connected = false;
1570
1571 wake_up_interruptible(&port->waitqueue);
1572 }
1573 spin_unlock_irq(&port->inbuf_lock);
1574
1575 if (is_console_port(port)) {
1576 spin_lock_irq(&pdrvdata_lock);
1577 list_del(&port->cons.list);
1578 spin_unlock_irq(&pdrvdata_lock);
1579 hvc_remove(port->cons.hvc);
1580 }
1581
1582 remove_port_data(port);
1583
1584
1585
1586
1587
1588
1589 port->portdev = NULL;
1590
1591 sysfs_remove_group(&port->dev->kobj, &port_attribute_group);
1592 device_destroy(pdrvdata.class, port->dev->devt);
1593 cdev_del(port->cdev);
1594
1595 debugfs_remove(port->debugfs_file);
1596 kfree(port->name);
1597
1598
1599
1600
1601
1602
1603 kref_put(&port->kref, remove_port);
1604}
1605
1606
1607static void handle_control_message(struct virtio_device *vdev,
1608 struct ports_device *portdev,
1609 struct port_buffer *buf)
1610{
1611 struct virtio_console_control *cpkt;
1612 struct port *port;
1613 size_t name_size;
1614 int err;
1615
1616 cpkt = (struct virtio_console_control *)(buf->buf + buf->offset);
1617
1618 port = find_port_by_id(portdev, virtio32_to_cpu(vdev, cpkt->id));
1619 if (!port &&
1620 cpkt->event != cpu_to_virtio16(vdev, VIRTIO_CONSOLE_PORT_ADD)) {
1621
1622 dev_dbg(&portdev->vdev->dev,
1623 "Invalid index %u in control packet\n", cpkt->id);
1624 return;
1625 }
1626
1627 switch (virtio16_to_cpu(vdev, cpkt->event)) {
1628 case VIRTIO_CONSOLE_PORT_ADD:
1629 if (port) {
1630 dev_dbg(&portdev->vdev->dev,
1631 "Port %u already added\n", port->id);
1632 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
1633 break;
1634 }
1635 if (virtio32_to_cpu(vdev, cpkt->id) >=
1636 portdev->config.max_nr_ports) {
1637 dev_warn(&portdev->vdev->dev,
1638 "Request for adding port with "
1639 "out-of-bound id %u, max. supported id: %u\n",
1640 cpkt->id, portdev->config.max_nr_ports - 1);
1641 break;
1642 }
1643 add_port(portdev, virtio32_to_cpu(vdev, cpkt->id));
1644 break;
1645 case VIRTIO_CONSOLE_PORT_REMOVE:
1646 unplug_port(port);
1647 break;
1648 case VIRTIO_CONSOLE_CONSOLE_PORT:
1649 if (!cpkt->value)
1650 break;
1651 if (is_console_port(port))
1652 break;
1653
1654 init_port_console(port);
1655 complete(&early_console_added);
1656
1657
1658
1659
1660 break;
1661 case VIRTIO_CONSOLE_RESIZE: {
1662 struct {
1663 __u16 rows;
1664 __u16 cols;
1665 } size;
1666
1667 if (!is_console_port(port))
1668 break;
1669
1670 memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt),
1671 sizeof(size));
1672 set_console_size(port, size.rows, size.cols);
1673
1674 port->cons.hvc->irq_requested = 1;
1675 resize_console(port);
1676 break;
1677 }
1678 case VIRTIO_CONSOLE_PORT_OPEN:
1679 port->host_connected = virtio16_to_cpu(vdev, cpkt->value);
1680 wake_up_interruptible(&port->waitqueue);
1681
1682
1683
1684
1685
1686 spin_lock_irq(&port->outvq_lock);
1687 reclaim_consumed_buffers(port);
1688 spin_unlock_irq(&port->outvq_lock);
1689
1690
1691
1692
1693
1694 spin_lock_irq(&port->inbuf_lock);
1695 send_sigio_to_port(port);
1696 spin_unlock_irq(&port->inbuf_lock);
1697 break;
1698 case VIRTIO_CONSOLE_PORT_NAME:
1699
1700
1701
1702
1703 if (port->name)
1704 break;
1705
1706
1707
1708
1709
1710 name_size = buf->len - buf->offset - sizeof(*cpkt) + 1;
1711
1712 port->name = kmalloc(name_size, GFP_KERNEL);
1713 if (!port->name) {
1714 dev_err(port->dev,
1715 "Not enough space to store port name\n");
1716 break;
1717 }
1718 strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt),
1719 name_size - 1);
1720 port->name[name_size - 1] = 0;
1721
1722
1723
1724
1725
1726 err = sysfs_create_group(&port->dev->kobj,
1727 &port_attribute_group);
1728 if (err) {
1729 dev_err(port->dev,
1730 "Error %d creating sysfs device attributes\n",
1731 err);
1732 } else {
1733
1734
1735
1736
1737
1738 kobject_uevent(&port->dev->kobj, KOBJ_CHANGE);
1739 }
1740 break;
1741 }
1742}
1743
1744static void control_work_handler(struct work_struct *work)
1745{
1746 struct ports_device *portdev;
1747 struct virtqueue *vq;
1748 struct port_buffer *buf;
1749 unsigned int len;
1750
1751 portdev = container_of(work, struct ports_device, control_work);
1752 vq = portdev->c_ivq;
1753
1754 spin_lock(&portdev->c_ivq_lock);
1755 while ((buf = virtqueue_get_buf(vq, &len))) {
1756 spin_unlock(&portdev->c_ivq_lock);
1757
1758 buf->len = len;
1759 buf->offset = 0;
1760
1761 handle_control_message(vq->vdev, portdev, buf);
1762
1763 spin_lock(&portdev->c_ivq_lock);
1764 if (add_inbuf(portdev->c_ivq, buf) < 0) {
1765 dev_warn(&portdev->vdev->dev,
1766 "Error adding buffer to queue\n");
1767 free_buf(buf, false);
1768 }
1769 }
1770 spin_unlock(&portdev->c_ivq_lock);
1771}
1772
1773static void out_intr(struct virtqueue *vq)
1774{
1775 struct port *port;
1776
1777 port = find_port_by_vq(vq->vdev->priv, vq);
1778 if (!port)
1779 return;
1780
1781 wake_up_interruptible(&port->waitqueue);
1782}
1783
1784static void in_intr(struct virtqueue *vq)
1785{
1786 struct port *port;
1787 unsigned long flags;
1788
1789 port = find_port_by_vq(vq->vdev->priv, vq);
1790 if (!port)
1791 return;
1792
1793 spin_lock_irqsave(&port->inbuf_lock, flags);
1794 port->inbuf = get_inbuf(port);
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813 if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev))
1814 discard_port_data(port);
1815
1816
1817 send_sigio_to_port(port);
1818
1819 spin_unlock_irqrestore(&port->inbuf_lock, flags);
1820
1821 wake_up_interruptible(&port->waitqueue);
1822
1823 if (is_console_port(port) && hvc_poll(port->cons.hvc))
1824 hvc_kick();
1825}
1826
1827static void control_intr(struct virtqueue *vq)
1828{
1829 struct ports_device *portdev;
1830
1831 portdev = vq->vdev->priv;
1832 schedule_work(&portdev->control_work);
1833}
1834
1835static void config_intr(struct virtio_device *vdev)
1836{
1837 struct ports_device *portdev;
1838
1839 portdev = vdev->priv;
1840
1841 if (!use_multiport(portdev))
1842 schedule_work(&portdev->config_work);
1843}
1844
1845static void config_work_handler(struct work_struct *work)
1846{
1847 struct ports_device *portdev;
1848
1849 portdev = container_of(work, struct ports_device, control_work);
1850 if (!use_multiport(portdev)) {
1851 struct virtio_device *vdev;
1852 struct port *port;
1853 u16 rows, cols;
1854
1855 vdev = portdev->vdev;
1856 virtio_cread(vdev, struct virtio_console_config, cols, &cols);
1857 virtio_cread(vdev, struct virtio_console_config, rows, &rows);
1858
1859 port = find_port_by_id(portdev, 0);
1860 set_console_size(port, rows, cols);
1861
1862
1863
1864
1865
1866
1867
1868
1869 resize_console(port);
1870 }
1871}
1872
1873static int init_vqs(struct ports_device *portdev)
1874{
1875 vq_callback_t **io_callbacks;
1876 char **io_names;
1877 struct virtqueue **vqs;
1878 u32 i, j, nr_ports, nr_queues;
1879 int err;
1880
1881 nr_ports = portdev->config.max_nr_ports;
1882 nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2;
1883
1884 vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL);
1885 io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL);
1886 io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL);
1887 portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
1888 GFP_KERNEL);
1889 portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *),
1890 GFP_KERNEL);
1891 if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs ||
1892 !portdev->out_vqs) {
1893 err = -ENOMEM;
1894 goto free;
1895 }
1896
1897
1898
1899
1900
1901
1902 j = 0;
1903 io_callbacks[j] = in_intr;
1904 io_callbacks[j + 1] = out_intr;
1905 io_names[j] = "input";
1906 io_names[j + 1] = "output";
1907 j += 2;
1908
1909 if (use_multiport(portdev)) {
1910 io_callbacks[j] = control_intr;
1911 io_callbacks[j + 1] = NULL;
1912 io_names[j] = "control-i";
1913 io_names[j + 1] = "control-o";
1914
1915 for (i = 1; i < nr_ports; i++) {
1916 j += 2;
1917 io_callbacks[j] = in_intr;
1918 io_callbacks[j + 1] = out_intr;
1919 io_names[j] = "input";
1920 io_names[j + 1] = "output";
1921 }
1922 }
1923
1924 err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs,
1925 io_callbacks,
1926 (const char **)io_names);
1927 if (err)
1928 goto free;
1929
1930 j = 0;
1931 portdev->in_vqs[0] = vqs[0];
1932 portdev->out_vqs[0] = vqs[1];
1933 j += 2;
1934 if (use_multiport(portdev)) {
1935 portdev->c_ivq = vqs[j];
1936 portdev->c_ovq = vqs[j + 1];
1937
1938 for (i = 1; i < nr_ports; i++) {
1939 j += 2;
1940 portdev->in_vqs[i] = vqs[j];
1941 portdev->out_vqs[i] = vqs[j + 1];
1942 }
1943 }
1944 kfree(io_names);
1945 kfree(io_callbacks);
1946 kfree(vqs);
1947
1948 return 0;
1949
1950free:
1951 kfree(portdev->out_vqs);
1952 kfree(portdev->in_vqs);
1953 kfree(io_names);
1954 kfree(io_callbacks);
1955 kfree(vqs);
1956
1957 return err;
1958}
1959
1960static const struct file_operations portdev_fops = {
1961 .owner = THIS_MODULE,
1962};
1963
1964static void remove_vqs(struct ports_device *portdev)
1965{
1966 portdev->vdev->config->del_vqs(portdev->vdev);
1967 kfree(portdev->in_vqs);
1968 kfree(portdev->out_vqs);
1969}
1970
1971static void remove_controlq_data(struct ports_device *portdev)
1972{
1973 struct port_buffer *buf;
1974 unsigned int len;
1975
1976 if (!use_multiport(portdev))
1977 return;
1978
1979 while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
1980 free_buf(buf, true);
1981
1982 while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
1983 free_buf(buf, true);
1984}
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994static int virtcons_probe(struct virtio_device *vdev)
1995{
1996 struct ports_device *portdev;
1997 int err;
1998 bool multiport;
1999 bool early = early_put_chars != NULL;
2000
2001
2002 if (!vdev->config->get &&
2003 (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)
2004 || virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT))) {
2005 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2006 __func__);
2007 return -EINVAL;
2008 }
2009
2010
2011 barrier();
2012
2013 portdev = kmalloc(sizeof(*portdev), GFP_KERNEL);
2014 if (!portdev) {
2015 err = -ENOMEM;
2016 goto fail;
2017 }
2018
2019
2020 portdev->vdev = vdev;
2021 vdev->priv = portdev;
2022
2023 portdev->chr_major = register_chrdev(0, "virtio-portsdev",
2024 &portdev_fops);
2025 if (portdev->chr_major < 0) {
2026 dev_err(&vdev->dev,
2027 "Error %d registering chrdev for device %u\n",
2028 portdev->chr_major, vdev->index);
2029 err = portdev->chr_major;
2030 goto free;
2031 }
2032
2033 multiport = false;
2034 portdev->config.max_nr_ports = 1;
2035
2036
2037 if (!is_rproc_serial(vdev) &&
2038 virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT,
2039 struct virtio_console_config, max_nr_ports,
2040 &portdev->config.max_nr_ports) == 0) {
2041 multiport = true;
2042 }
2043
2044 err = init_vqs(portdev);
2045 if (err < 0) {
2046 dev_err(&vdev->dev, "Error %d initializing vqs\n", err);
2047 goto free_chrdev;
2048 }
2049
2050 spin_lock_init(&portdev->ports_lock);
2051 INIT_LIST_HEAD(&portdev->ports);
2052
2053 virtio_device_ready(portdev->vdev);
2054
2055 INIT_WORK(&portdev->config_work, &config_work_handler);
2056 INIT_WORK(&portdev->control_work, &control_work_handler);
2057
2058 if (multiport) {
2059 unsigned int nr_added_bufs;
2060
2061 spin_lock_init(&portdev->c_ivq_lock);
2062 spin_lock_init(&portdev->c_ovq_lock);
2063
2064 nr_added_bufs = fill_queue(portdev->c_ivq,
2065 &portdev->c_ivq_lock);
2066 if (!nr_added_bufs) {
2067 dev_err(&vdev->dev,
2068 "Error allocating buffers for control queue\n");
2069 err = -ENOMEM;
2070 goto free_vqs;
2071 }
2072 } else {
2073
2074
2075
2076
2077 add_port(portdev, 0);
2078 }
2079
2080 spin_lock_irq(&pdrvdata_lock);
2081 list_add_tail(&portdev->list, &pdrvdata.portdevs);
2082 spin_unlock_irq(&pdrvdata_lock);
2083
2084 __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
2085 VIRTIO_CONSOLE_DEVICE_READY, 1);
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096 if (multiport && early)
2097 wait_for_completion(&early_console_added);
2098
2099 return 0;
2100
2101free_vqs:
2102
2103 __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
2104 VIRTIO_CONSOLE_DEVICE_READY, 0);
2105 remove_vqs(portdev);
2106free_chrdev:
2107 unregister_chrdev(portdev->chr_major, "virtio-portsdev");
2108free:
2109 kfree(portdev);
2110fail:
2111 return err;
2112}
2113
2114static void virtcons_remove(struct virtio_device *vdev)
2115{
2116 struct ports_device *portdev;
2117 struct port *port, *port2;
2118
2119 portdev = vdev->priv;
2120
2121 spin_lock_irq(&pdrvdata_lock);
2122 list_del(&portdev->list);
2123 spin_unlock_irq(&pdrvdata_lock);
2124
2125
2126 vdev->config->reset(vdev);
2127
2128 if (use_multiport(portdev))
2129 cancel_work_sync(&portdev->control_work);
2130 else
2131 cancel_work_sync(&portdev->config_work);
2132
2133 list_for_each_entry_safe(port, port2, &portdev->ports, list)
2134 unplug_port(port);
2135
2136 unregister_chrdev(portdev->chr_major, "virtio-portsdev");
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146 remove_controlq_data(portdev);
2147 remove_vqs(portdev);
2148 kfree(portdev);
2149}
2150
2151static struct virtio_device_id id_table[] = {
2152 { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID },
2153 { 0 },
2154};
2155
2156static unsigned int features[] = {
2157 VIRTIO_CONSOLE_F_SIZE,
2158 VIRTIO_CONSOLE_F_MULTIPORT,
2159};
2160
2161static struct virtio_device_id rproc_serial_id_table[] = {
2162#if IS_ENABLED(CONFIG_REMOTEPROC)
2163 { VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID },
2164#endif
2165 { 0 },
2166};
2167
2168static unsigned int rproc_serial_features[] = {
2169};
2170
2171#ifdef CONFIG_PM_SLEEP
2172static int virtcons_freeze(struct virtio_device *vdev)
2173{
2174 struct ports_device *portdev;
2175 struct port *port;
2176
2177 portdev = vdev->priv;
2178
2179 vdev->config->reset(vdev);
2180
2181 virtqueue_disable_cb(portdev->c_ivq);
2182 cancel_work_sync(&portdev->control_work);
2183 cancel_work_sync(&portdev->config_work);
2184
2185
2186
2187
2188 virtqueue_disable_cb(portdev->c_ivq);
2189 remove_controlq_data(portdev);
2190
2191 list_for_each_entry(port, &portdev->ports, list) {
2192 virtqueue_disable_cb(port->in_vq);
2193 virtqueue_disable_cb(port->out_vq);
2194
2195
2196
2197
2198 port->host_connected = false;
2199 remove_port_data(port);
2200 }
2201 remove_vqs(portdev);
2202
2203 return 0;
2204}
2205
2206static int virtcons_restore(struct virtio_device *vdev)
2207{
2208 struct ports_device *portdev;
2209 struct port *port;
2210 int ret;
2211
2212 portdev = vdev->priv;
2213
2214 ret = init_vqs(portdev);
2215 if (ret)
2216 return ret;
2217
2218 virtio_device_ready(portdev->vdev);
2219
2220 if (use_multiport(portdev))
2221 fill_queue(portdev->c_ivq, &portdev->c_ivq_lock);
2222
2223 list_for_each_entry(port, &portdev->ports, list) {
2224 port->in_vq = portdev->in_vqs[port->id];
2225 port->out_vq = portdev->out_vqs[port->id];
2226
2227 fill_queue(port->in_vq, &port->inbuf_lock);
2228
2229
2230 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
2231
2232
2233
2234
2235
2236 if (port->guest_connected)
2237 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
2238 }
2239 return 0;
2240}
2241#endif
2242
2243static struct virtio_driver virtio_console = {
2244 .feature_table = features,
2245 .feature_table_size = ARRAY_SIZE(features),
2246 .driver.name = KBUILD_MODNAME,
2247 .driver.owner = THIS_MODULE,
2248 .id_table = id_table,
2249 .probe = virtcons_probe,
2250 .remove = virtcons_remove,
2251 .config_changed = config_intr,
2252#ifdef CONFIG_PM_SLEEP
2253 .freeze = virtcons_freeze,
2254 .restore = virtcons_restore,
2255#endif
2256};
2257
2258static struct virtio_driver virtio_rproc_serial = {
2259 .feature_table = rproc_serial_features,
2260 .feature_table_size = ARRAY_SIZE(rproc_serial_features),
2261 .driver.name = "virtio_rproc_serial",
2262 .driver.owner = THIS_MODULE,
2263 .id_table = rproc_serial_id_table,
2264 .probe = virtcons_probe,
2265 .remove = virtcons_remove,
2266};
2267
2268static int __init init(void)
2269{
2270 int err;
2271
2272 pdrvdata.class = class_create(THIS_MODULE, "virtio-ports");
2273 if (IS_ERR(pdrvdata.class)) {
2274 err = PTR_ERR(pdrvdata.class);
2275 pr_err("Error %d creating virtio-ports class\n", err);
2276 return err;
2277 }
2278
2279 pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL);
2280 if (!pdrvdata.debugfs_dir)
2281 pr_warning("Error creating debugfs dir for virtio-ports\n");
2282 INIT_LIST_HEAD(&pdrvdata.consoles);
2283 INIT_LIST_HEAD(&pdrvdata.portdevs);
2284
2285 err = register_virtio_driver(&virtio_console);
2286 if (err < 0) {
2287 pr_err("Error %d registering virtio driver\n", err);
2288 goto free;
2289 }
2290 err = register_virtio_driver(&virtio_rproc_serial);
2291 if (err < 0) {
2292 pr_err("Error %d registering virtio rproc serial driver\n",
2293 err);
2294 goto unregister;
2295 }
2296 return 0;
2297unregister:
2298 unregister_virtio_driver(&virtio_console);
2299free:
2300 debugfs_remove_recursive(pdrvdata.debugfs_dir);
2301 class_destroy(pdrvdata.class);
2302 return err;
2303}
2304
2305static void __exit fini(void)
2306{
2307 reclaim_dma_bufs();
2308
2309 unregister_virtio_driver(&virtio_console);
2310 unregister_virtio_driver(&virtio_rproc_serial);
2311
2312 class_destroy(pdrvdata.class);
2313 debugfs_remove_recursive(pdrvdata.debugfs_dir);
2314}
2315module_init(init);
2316module_exit(fini);
2317
2318MODULE_DEVICE_TABLE(virtio, id_table);
2319MODULE_DESCRIPTION("Virtio console driver");
2320MODULE_LICENSE("GPL");
2321