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