Lines Matching +full:port +full:-
1 // SPDX-License-Identifier: GPL-2.0-or-later
28 #include <linux/dma-mapping.h>
43 /* Used for exporting per-port information to debugfs */
56 .name = "virtio-ports",
67 /* The hvc device associated with this console port */
113 * This is a per-device struct that stores data common to all the
114 * ports for that device (vdev->priv).
144 * guest->host transfers, one for host->guest transfers
149 * A control packet buffer for guest->host requests, protected
154 /* Array of per-port IO virtqueues */
165 /* This struct holds the per-port data */
166 struct port { struct
167 /* Next port in the list, head is in the ports_device */
178 * port. Has to be a spinlock because it can be called from argument
186 /* The IO vqs for this port */ argument
189 /* File in the debugfs directory that exposes this port's information */ argument
194 * this port for accounting and debugging purposes. These argument
195 * counts are not reset across port open / close events.
200 * The entries in this struct will be valid if this port is
205 /* Each port associates with a separate char device */ argument
209 /* Reference-counting to handle port hot-unplugs and file operations */ argument
215 /* The 'name' of the port that we expose via sysfs properties */ argument
221 /* The 'id' to identify the port with the Host */ argument
229 /* We should allow only one process to open a port */ argument
233 static struct port *find_port_by_vtermno(u32 vtermno) in find_port_by_vtermno() argument
235 struct port *port; in find_port_by_vtermno() local
241 if (cons->vtermno == vtermno) { in find_port_by_vtermno()
242 port = container_of(cons, struct port, cons); in find_port_by_vtermno()
246 port = NULL; in find_port_by_vtermno()
249 return port; in find_port_by_vtermno()
252 static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, in find_port_by_devt_in_portdev()
255 struct port *port; in find_port_by_devt_in_portdev() local
258 spin_lock_irqsave(&portdev->ports_lock, flags); in find_port_by_devt_in_portdev()
259 list_for_each_entry(port, &portdev->ports, list) { in find_port_by_devt_in_portdev()
260 if (port->cdev->dev == dev) { in find_port_by_devt_in_portdev()
261 kref_get(&port->kref); in find_port_by_devt_in_portdev()
265 port = NULL; in find_port_by_devt_in_portdev()
267 spin_unlock_irqrestore(&portdev->ports_lock, flags); in find_port_by_devt_in_portdev()
269 return port; in find_port_by_devt_in_portdev()
272 static struct port *find_port_by_devt(dev_t dev) in find_port_by_devt()
275 struct port *port; in find_port_by_devt() local
280 port = find_port_by_devt_in_portdev(portdev, dev); in find_port_by_devt()
281 if (port) in find_port_by_devt()
284 port = NULL; in find_port_by_devt()
287 return port; in find_port_by_devt()
290 static struct port *find_port_by_id(struct ports_device *portdev, u32 id) in find_port_by_id()
292 struct port *port; in find_port_by_id() local
295 spin_lock_irqsave(&portdev->ports_lock, flags); in find_port_by_id()
296 list_for_each_entry(port, &portdev->ports, list) in find_port_by_id()
297 if (port->id == id) in find_port_by_id()
299 port = NULL; in find_port_by_id()
301 spin_unlock_irqrestore(&portdev->ports_lock, flags); in find_port_by_id()
303 return port; in find_port_by_id()
306 static struct port *find_port_by_vq(struct ports_device *portdev, in find_port_by_vq()
309 struct port *port; in find_port_by_vq() local
312 spin_lock_irqsave(&portdev->ports_lock, flags); in find_port_by_vq()
313 list_for_each_entry(port, &portdev->ports, list) in find_port_by_vq()
314 if (port->in_vq == vq || port->out_vq == vq) in find_port_by_vq()
316 port = NULL; in find_port_by_vq()
318 spin_unlock_irqrestore(&portdev->ports_lock, flags); in find_port_by_vq()
319 return port; in find_port_by_vq()
322 static bool is_console_port(struct port *port) in is_console_port() argument
324 if (port->cons.hvc) in is_console_port()
331 return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL; in is_rproc_serial()
340 if (!portdev->vdev) in use_multiport()
342 return __virtio_test_bit(portdev->vdev, VIRTIO_CONSOLE_F_MULTIPORT); in use_multiport()
352 for (i = 0; i < buf->sgpages; i++) { in free_buf()
353 struct page *page = sg_page(&buf->sg[i]); in free_buf()
359 if (!buf->dev) { in free_buf()
360 kfree(buf->buf); in free_buf()
366 /* queue up dma-buffers to be freed later */ in free_buf()
368 list_add_tail(&buf->list, &pending_free_dma_bufs); in free_buf()
372 dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma); in free_buf()
375 put_device(buf->dev); in free_buf()
398 list_del(&buf->list); in reclaim_dma_bufs()
418 buf->sgpages = pages; in alloc_buf()
420 buf->dev = NULL; in alloc_buf()
421 buf->buf = NULL; in alloc_buf()
432 buf->dev = vdev->dev.parent; in alloc_buf()
433 if (!buf->dev) in alloc_buf()
437 get_device(buf->dev); in alloc_buf()
438 buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma, in alloc_buf()
441 buf->dev = NULL; in alloc_buf()
442 buf->buf = kmalloc(buf_size, GFP_KERNEL); in alloc_buf()
445 if (!buf->buf) in alloc_buf()
447 buf->len = 0; in alloc_buf()
448 buf->offset = 0; in alloc_buf()
449 buf->size = buf_size; in alloc_buf()
459 static struct port_buffer *get_inbuf(struct port *port) in get_inbuf() argument
464 if (port->inbuf) in get_inbuf()
465 return port->inbuf; in get_inbuf()
467 buf = virtqueue_get_buf(port->in_vq, &len); in get_inbuf()
469 buf->len = min_t(size_t, len, buf->size); in get_inbuf()
470 buf->offset = 0; in get_inbuf()
471 port->stats.bytes_received += len; in get_inbuf()
477 * Create a scatter-gather list representing our input buffer and put
487 sg_init_one(sg, buf->buf, buf->size); in add_inbuf()
492 ret = vq->num_free; in add_inbuf()
496 /* Discard any unread data this port has. Callers lockers. */
497 static void discard_port_data(struct port *port) in discard_port_data() argument
502 if (!port->portdev) { in discard_port_data()
506 buf = get_inbuf(port); in discard_port_data()
510 port->stats.bytes_discarded += buf->len - buf->offset; in discard_port_data()
511 if (add_inbuf(port->in_vq, buf) < 0) { in discard_port_data()
515 port->inbuf = NULL; in discard_port_data()
516 buf = get_inbuf(port); in discard_port_data()
519 dev_warn(port->dev, "Errors adding %d buffers back to vq\n", in discard_port_data()
523 static bool port_has_data(struct port *port) in port_has_data() argument
529 spin_lock_irqsave(&port->inbuf_lock, flags); in port_has_data()
530 port->inbuf = get_inbuf(port); in port_has_data()
531 if (port->inbuf) in port_has_data()
534 spin_unlock_irqrestore(&port->inbuf_lock, flags); in port_has_data()
548 vq = portdev->c_ovq; in __send_control_msg()
550 spin_lock(&portdev->c_ovq_lock); in __send_control_msg()
552 portdev->cpkt.id = cpu_to_virtio32(portdev->vdev, port_id); in __send_control_msg()
553 portdev->cpkt.event = cpu_to_virtio16(portdev->vdev, event); in __send_control_msg()
554 portdev->cpkt.value = cpu_to_virtio16(portdev->vdev, value); in __send_control_msg()
556 sg_init_one(sg, &portdev->cpkt, sizeof(struct virtio_console_control)); in __send_control_msg()
558 if (virtqueue_add_outbuf(vq, sg, 1, &portdev->cpkt, GFP_ATOMIC) == 0) { in __send_control_msg()
565 spin_unlock(&portdev->c_ovq_lock); in __send_control_msg()
569 static ssize_t send_control_msg(struct port *port, unsigned int event, in send_control_msg() argument
572 /* Did the port get unplugged before userspace closed it? */ in send_control_msg()
573 if (port->portdev) in send_control_msg()
574 return __send_control_msg(port->portdev, port->id, event, value); in send_control_msg()
579 /* Callers must take the port->outvq_lock */
580 static void reclaim_consumed_buffers(struct port *port) in reclaim_consumed_buffers() argument
585 if (!port->portdev) { in reclaim_consumed_buffers()
589 while ((buf = virtqueue_get_buf(port->out_vq, &len))) { in reclaim_consumed_buffers()
591 port->outvq_full = false; in reclaim_consumed_buffers()
595 static ssize_t __send_to_port(struct port *port, struct scatterlist *sg, in __send_to_port() argument
604 out_vq = port->out_vq; in __send_to_port()
606 spin_lock_irqsave(&port->outvq_lock, flags); in __send_to_port()
608 reclaim_consumed_buffers(port); in __send_to_port()
620 if (out_vq->num_free == 0) in __send_to_port()
621 port->outvq_full = true; in __send_to_port()
639 spin_unlock_irqrestore(&port->outvq_lock, flags); in __send_to_port()
641 port->stats.bytes_sent += in_count; in __send_to_port()
643 * We're expected to return the amount of data we wrote -- all in __send_to_port()
653 static ssize_t fill_readbuf(struct port *port, u8 __user *out_buf, in fill_readbuf() argument
659 if (!out_count || !port_has_data(port)) in fill_readbuf()
662 buf = port->inbuf; in fill_readbuf()
663 out_count = min(out_count, buf->len - buf->offset); in fill_readbuf()
668 ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); in fill_readbuf()
670 return -EFAULT; in fill_readbuf()
672 memcpy((__force u8 *)out_buf, buf->buf + buf->offset, in fill_readbuf()
676 buf->offset += out_count; in fill_readbuf()
678 if (buf->offset == buf->len) { in fill_readbuf()
681 * Re-queue so that the Host can send us more data. in fill_readbuf()
683 spin_lock_irqsave(&port->inbuf_lock, flags); in fill_readbuf()
684 port->inbuf = NULL; in fill_readbuf()
686 if (add_inbuf(port->in_vq, buf) < 0) in fill_readbuf()
687 dev_warn(port->dev, "failed add_buf\n"); in fill_readbuf()
689 spin_unlock_irqrestore(&port->inbuf_lock, flags); in fill_readbuf()
696 static bool will_read_block(struct port *port) in will_read_block() argument
698 if (!port->guest_connected) { in will_read_block()
699 /* Port got hot-unplugged. Let's exit. */ in will_read_block()
702 return !port_has_data(port) && port->host_connected; in will_read_block()
705 static bool will_write_block(struct port *port) in will_write_block() argument
709 if (!port->guest_connected) { in will_write_block()
710 /* Port got hot-unplugged. Let's exit. */ in will_write_block()
713 if (!port->host_connected) in will_write_block()
716 spin_lock_irq(&port->outvq_lock); in will_write_block()
721 reclaim_consumed_buffers(port); in will_write_block()
722 ret = port->outvq_full; in will_write_block()
723 spin_unlock_irq(&port->outvq_lock); in will_write_block()
731 struct port *port; in port_fops_read() local
734 port = filp->private_data; in port_fops_read()
736 /* Port is hot-unplugged. */ in port_fops_read()
737 if (!port->guest_connected) in port_fops_read()
738 return -ENODEV; in port_fops_read()
740 if (!port_has_data(port)) { in port_fops_read()
746 if (!port->host_connected) in port_fops_read()
748 if (filp->f_flags & O_NONBLOCK) in port_fops_read()
749 return -EAGAIN; in port_fops_read()
751 ret = wait_event_freezable(port->waitqueue, in port_fops_read()
752 !will_read_block(port)); in port_fops_read()
756 /* Port got hot-unplugged while we were waiting above. */ in port_fops_read()
757 if (!port->guest_connected) in port_fops_read()
758 return -ENODEV; in port_fops_read()
769 if (!port_has_data(port) && !port->host_connected) in port_fops_read()
772 return fill_readbuf(port, ubuf, count, true); in port_fops_read()
775 static int wait_port_writable(struct port *port, bool nonblock) in wait_port_writable() argument
779 if (will_write_block(port)) { in wait_port_writable()
781 return -EAGAIN; in wait_port_writable()
783 ret = wait_event_freezable(port->waitqueue, in wait_port_writable()
784 !will_write_block(port)); in wait_port_writable()
788 /* Port got hot-unplugged. */ in wait_port_writable()
789 if (!port->guest_connected) in wait_port_writable()
790 return -ENODEV; in wait_port_writable()
798 struct port *port; in port_fops_write() local
808 port = filp->private_data; in port_fops_write()
810 nonblock = filp->f_flags & O_NONBLOCK; in port_fops_write()
812 ret = wait_port_writable(port, nonblock); in port_fops_write()
818 buf = alloc_buf(port->portdev->vdev, count, 0); in port_fops_write()
820 return -ENOMEM; in port_fops_write()
822 ret = copy_from_user(buf->buf, ubuf, count); in port_fops_write()
824 ret = -EFAULT; in port_fops_write()
829 * We now ask send_buf() to not spin for generic ports -- we in port_fops_write()
830 * can re-use the same code path that non-blocking file in port_fops_write()
836 sg_init_one(sg, buf->buf, count); in port_fops_write()
837 ret = __send_to_port(port, sg, 1, count, buf, nonblock); in port_fops_write()
858 struct sg_list *sgl = sd->u.data; in pipe_to_sg()
861 if (sgl->n == sgl->size) in pipe_to_sg()
867 get_page(buf->page); in pipe_to_sg()
868 unlock_page(buf->page); in pipe_to_sg()
870 len = min(buf->len, sd->len); in pipe_to_sg()
871 sg_set_page(&(sgl->sg[sgl->n]), buf->page, len, buf->offset); in pipe_to_sg()
878 return -ENOMEM; in pipe_to_sg()
880 offset = sd->pos & ~PAGE_MASK; in pipe_to_sg()
882 len = sd->len; in pipe_to_sg()
884 len = PAGE_SIZE - offset; in pipe_to_sg()
886 src = kmap_atomic(buf->page); in pipe_to_sg()
887 memcpy(page_address(page) + offset, src + buf->offset, len); in pipe_to_sg()
890 sg_set_page(&(sgl->sg[sgl->n]), page, len, offset); in pipe_to_sg()
892 sgl->n++; in pipe_to_sg()
893 sgl->len += len; in pipe_to_sg()
898 /* Faster zero-copy write by splicing */
903 struct port *port = filp->private_data; in port_fops_splice_write() local
917 * pipe_to_sg() must allocate dma-buffers and copy content from in port_fops_splice_write()
919 * support allocating and freeing such a list of dma-buffers. in port_fops_splice_write()
921 if (is_rproc_serial(port->out_vq->vdev)) in port_fops_splice_write()
922 return -EINVAL; in port_fops_splice_write()
926 if (pipe_empty(pipe->head, pipe->tail)) in port_fops_splice_write()
929 ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK); in port_fops_splice_write()
933 occupancy = pipe_occupancy(pipe->head, pipe->tail); in port_fops_splice_write()
934 buf = alloc_buf(port->portdev->vdev, 0, occupancy); in port_fops_splice_write()
937 ret = -ENOMEM; in port_fops_splice_write()
944 sgl.sg = buf->sg; in port_fops_splice_write()
949 ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true); in port_fops_splice_write()
962 struct port *port; in port_fops_poll() local
965 port = filp->private_data; in port_fops_poll()
966 poll_wait(filp, &port->waitqueue, wait); in port_fops_poll()
968 if (!port->guest_connected) { in port_fops_poll()
969 /* Port got unplugged */ in port_fops_poll()
973 if (!will_read_block(port)) in port_fops_poll()
975 if (!will_write_block(port)) in port_fops_poll()
977 if (!port->host_connected) in port_fops_poll()
987 struct port *port; in port_fops_release() local
989 port = filp->private_data; in port_fops_release()
991 /* Notify host of port being closed */ in port_fops_release()
992 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); in port_fops_release()
994 spin_lock_irq(&port->inbuf_lock); in port_fops_release()
995 port->guest_connected = false; in port_fops_release()
997 discard_port_data(port); in port_fops_release()
999 spin_unlock_irq(&port->inbuf_lock); in port_fops_release()
1001 spin_lock_irq(&port->outvq_lock); in port_fops_release()
1002 reclaim_consumed_buffers(port); in port_fops_release()
1003 spin_unlock_irq(&port->outvq_lock); in port_fops_release()
1007 * Locks aren't necessary here as a port can't be opened after in port_fops_release()
1008 * unplug, and if a port isn't unplugged, a kref would already in port_fops_release()
1009 * exist for the port. Plus, taking ports_lock here would in port_fops_release()
1011 * inside remove_port if we're the last holder of the port, in port_fops_release()
1014 kref_put(&port->kref, remove_port); in port_fops_release()
1021 struct cdev *cdev = inode->i_cdev; in port_fops_open()
1022 struct port *port; in port_fops_open() local
1025 /* We get the port with a kref here */ in port_fops_open()
1026 port = find_port_by_devt(cdev->dev); in port_fops_open()
1027 if (!port) { in port_fops_open()
1028 /* Port was unplugged before we could proceed */ in port_fops_open()
1029 return -ENXIO; in port_fops_open()
1031 filp->private_data = port; in port_fops_open()
1034 * Don't allow opening of console port devices -- that's done in port_fops_open()
1037 if (is_console_port(port)) { in port_fops_open()
1038 ret = -ENXIO; in port_fops_open()
1042 /* Allow only one process to open a particular port at a time */ in port_fops_open()
1043 spin_lock_irq(&port->inbuf_lock); in port_fops_open()
1044 if (port->guest_connected) { in port_fops_open()
1045 spin_unlock_irq(&port->inbuf_lock); in port_fops_open()
1046 ret = -EBUSY; in port_fops_open()
1050 port->guest_connected = true; in port_fops_open()
1051 spin_unlock_irq(&port->inbuf_lock); in port_fops_open()
1053 spin_lock_irq(&port->outvq_lock); in port_fops_open()
1056 * buffers in the window of the port getting previously closed in port_fops_open()
1059 reclaim_consumed_buffers(port); in port_fops_open()
1060 spin_unlock_irq(&port->outvq_lock); in port_fops_open()
1064 /* Notify host of port being opened */ in port_fops_open()
1065 send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); in port_fops_open()
1069 kref_put(&port->kref, remove_port); in port_fops_open()
1075 struct port *port; in port_fops_fasync() local
1077 port = filp->private_data; in port_fops_fasync()
1078 return fasync_helper(fd, filp, mode, &port->async_queue); in port_fops_fasync()
1085 * /dev/vport<device number>p<port number>
1101 * We turn the characters into a scatter-gather list, add it to the
1108 struct port *port; in put_chars() local
1113 port = find_port_by_vtermno(vtermno); in put_chars()
1114 if (!port) in put_chars()
1115 return -EPIPE; in put_chars()
1119 return -ENOMEM; in put_chars()
1122 ret = __send_to_port(port, sg, 1, count, data, false); in put_chars()
1136 struct port *port; in get_chars() local
1138 port = find_port_by_vtermno(vtermno); in get_chars()
1139 if (!port) in get_chars()
1140 return -EPIPE; in get_chars()
1143 BUG_ON(!port->in_vq); in get_chars()
1145 return fill_readbuf(port, (__force u8 __user *)buf, count, false); in get_chars()
1148 static void resize_console(struct port *port) in resize_console() argument
1152 /* The port could have been hot-unplugged */ in resize_console()
1153 if (!port || !is_console_port(port)) in resize_console()
1156 vdev = port->portdev->vdev; in resize_console()
1161 hvc_resize(port->cons.hvc, port->cons.ws); in resize_console()
1167 struct port *port; in notifier_add_vio() local
1169 port = find_port_by_vtermno(hp->vtermno); in notifier_add_vio()
1170 if (!port) in notifier_add_vio()
1171 return -EINVAL; in notifier_add_vio()
1173 hp->irq_requested = 1; in notifier_add_vio()
1174 resize_console(port); in notifier_add_vio()
1181 hp->irq_requested = 0; in notifier_del_vio()
1193 static int init_port_console(struct port *port) in init_port_console() argument
1198 * The Host's telling us this port is a console port. Hook it in init_port_console()
1218 port->cons.vtermno = ret; in init_port_console()
1219 port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); in init_port_console()
1220 if (IS_ERR(port->cons.hvc)) { in init_port_console()
1221 ret = PTR_ERR(port->cons.hvc); in init_port_console()
1222 dev_err(port->dev, in init_port_console()
1223 "error %d allocating hvc for port\n", ret); in init_port_console()
1224 port->cons.hvc = NULL; in init_port_console()
1225 ida_free(&vtermno_ida, port->cons.vtermno); in init_port_console()
1229 list_add_tail(&port->cons.list, &pdrvdata.consoles); in init_port_console()
1231 port->guest_connected = true; in init_port_console()
1233 /* Notify host of port being opened */ in init_port_console()
1234 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); in init_port_console()
1242 struct port *port; in show_port_name() local
1244 port = dev_get_drvdata(dev); in show_port_name()
1246 return sprintf(buffer, "%s\n", port->name); in show_port_name()
1263 struct port *port = s->private; in port_debugfs_show() local
1265 seq_printf(s, "name: %s\n", port->name ? port->name : ""); in port_debugfs_show()
1266 seq_printf(s, "guest_connected: %d\n", port->guest_connected); in port_debugfs_show()
1267 seq_printf(s, "host_connected: %d\n", port->host_connected); in port_debugfs_show()
1268 seq_printf(s, "outvq_full: %d\n", port->outvq_full); in port_debugfs_show()
1269 seq_printf(s, "bytes_sent: %lu\n", port->stats.bytes_sent); in port_debugfs_show()
1270 seq_printf(s, "bytes_received: %lu\n", port->stats.bytes_received); in port_debugfs_show()
1271 seq_printf(s, "bytes_discarded: %lu\n", port->stats.bytes_discarded); in port_debugfs_show()
1273 is_console_port(port) ? "yes" : "no"); in port_debugfs_show()
1274 seq_printf(s, "console_vtermno: %u\n", port->cons.vtermno); in port_debugfs_show()
1281 static void set_console_size(struct port *port, u16 rows, u16 cols) in set_console_size() argument
1283 if (!port || !is_console_port(port)) in set_console_size()
1286 port->cons.ws.ws_row = rows; in set_console_size()
1287 port->cons.ws.ws_col = cols; in set_console_size()
1298 buf = alloc_buf(vq->vdev, PAGE_SIZE, 0); in fill_queue()
1300 return -ENOMEM; in fill_queue()
1316 static void send_sigio_to_port(struct port *port) in send_sigio_to_port() argument
1318 if (port->async_queue && port->guest_connected) in send_sigio_to_port()
1319 kill_fasync(&port->async_queue, SIGIO, POLL_OUT); in send_sigio_to_port()
1325 struct port *port; in add_port() local
1329 port = kmalloc(sizeof(*port), GFP_KERNEL); in add_port()
1330 if (!port) { in add_port()
1331 err = -ENOMEM; in add_port()
1334 kref_init(&port->kref); in add_port()
1336 port->portdev = portdev; in add_port()
1337 port->id = id; in add_port()
1339 port->name = NULL; in add_port()
1340 port->inbuf = NULL; in add_port()
1341 port->cons.hvc = NULL; in add_port()
1342 port->async_queue = NULL; in add_port()
1344 port->cons.ws.ws_row = port->cons.ws.ws_col = 0; in add_port()
1345 port->cons.vtermno = 0; in add_port()
1347 port->host_connected = port->guest_connected = false; in add_port()
1348 port->stats = (struct port_stats) { 0 }; in add_port()
1350 port->outvq_full = false; in add_port()
1352 port->in_vq = portdev->in_vqs[port->id]; in add_port()
1353 port->out_vq = portdev->out_vqs[port->id]; in add_port()
1355 port->cdev = cdev_alloc(); in add_port()
1356 if (!port->cdev) { in add_port()
1357 dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); in add_port()
1358 err = -ENOMEM; in add_port()
1361 port->cdev->ops = &port_fops; in add_port()
1363 devt = MKDEV(portdev->chr_major, id); in add_port()
1364 err = cdev_add(port->cdev, devt, 1); in add_port()
1366 dev_err(&port->portdev->vdev->dev, in add_port()
1367 "Error %d adding cdev for port %u\n", err, id); in add_port()
1370 port->dev = device_create(&port_class, &port->portdev->vdev->dev, in add_port()
1371 devt, port, "vport%up%u", in add_port()
1372 port->portdev->vdev->index, id); in add_port()
1373 if (IS_ERR(port->dev)) { in add_port()
1374 err = PTR_ERR(port->dev); in add_port()
1375 dev_err(&port->portdev->vdev->dev, in add_port()
1376 "Error %d creating device for port %u\n", in add_port()
1381 spin_lock_init(&port->inbuf_lock); in add_port()
1382 spin_lock_init(&port->outvq_lock); in add_port()
1383 init_waitqueue_head(&port->waitqueue); in add_port()
1389 err = fill_queue(port->in_vq, &port->inbuf_lock); in add_port()
1390 if (err < 0 && err != -ENOSPC) { in add_port()
1391 dev_err(port->dev, "Error allocating inbufs\n"); in add_port()
1395 if (is_rproc_serial(port->portdev->vdev)) in add_port()
1398 * rproc_serial does not want the console port, only in add_port()
1399 * the generic port implementation. in add_port()
1401 port->host_connected = true; in add_port()
1402 else if (!use_multiport(port->portdev)) { in add_port()
1405 * this has to be a console port. in add_port()
1407 err = init_port_console(port); in add_port()
1412 spin_lock_irq(&portdev->ports_lock); in add_port()
1413 list_add_tail(&port->list, &port->portdev->ports); in add_port()
1414 spin_unlock_irq(&portdev->ports_lock); in add_port()
1418 * configuration parameters for this port (eg, port name, in add_port()
1419 * caching, whether this is a console port, etc.) in add_port()
1421 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); in add_port()
1425 * inspect a port's state at any time in add_port()
1428 port->portdev->vdev->index, id); in add_port()
1429 port->debugfs_file = debugfs_create_file(debugfs_name, 0444, in add_port()
1431 port, &port_debugfs_fops); in add_port()
1436 device_destroy(&port_class, port->dev->devt); in add_port()
1438 cdev_del(port->cdev); in add_port()
1440 kfree(port); in add_port()
1442 /* The host might want to notify management sw about port add failure */ in add_port()
1447 /* No users remain, remove all port-specific data. */
1450 struct port *port; in remove_port() local
1452 port = container_of(kref, struct port, kref); in remove_port()
1454 kfree(port); in remove_port()
1457 static void remove_port_data(struct port *port) in remove_port_data() argument
1459 spin_lock_irq(&port->inbuf_lock); in remove_port_data()
1460 /* Remove unused data this port might have received. */ in remove_port_data()
1461 discard_port_data(port); in remove_port_data()
1462 spin_unlock_irq(&port->inbuf_lock); in remove_port_data()
1464 spin_lock_irq(&port->outvq_lock); in remove_port_data()
1465 reclaim_consumed_buffers(port); in remove_port_data()
1466 spin_unlock_irq(&port->outvq_lock); in remove_port_data()
1470 * Port got unplugged. Remove port from portdev's list and drop the
1471 * kref reference. If no userspace has this port opened, it will
1472 * result in immediate removal the port.
1474 static void unplug_port(struct port *port) in unplug_port() argument
1476 spin_lock_irq(&port->portdev->ports_lock); in unplug_port()
1477 list_del(&port->list); in unplug_port()
1478 spin_unlock_irq(&port->portdev->ports_lock); in unplug_port()
1480 spin_lock_irq(&port->inbuf_lock); in unplug_port()
1481 if (port->guest_connected) { in unplug_port()
1482 /* Let the app know the port is going down. */ in unplug_port()
1483 send_sigio_to_port(port); in unplug_port()
1486 port->guest_connected = false; in unplug_port()
1487 port->host_connected = false; in unplug_port()
1489 wake_up_interruptible(&port->waitqueue); in unplug_port()
1491 spin_unlock_irq(&port->inbuf_lock); in unplug_port()
1493 if (is_console_port(port)) { in unplug_port()
1495 list_del(&port->cons.list); in unplug_port()
1497 hvc_remove(port->cons.hvc); in unplug_port()
1498 ida_free(&vtermno_ida, port->cons.vtermno); in unplug_port()
1501 remove_port_data(port); in unplug_port()
1504 * We should just assume the device itself has gone off -- in unplug_port()
1505 * else a close on an open port later will try to send out a in unplug_port()
1508 port->portdev = NULL; in unplug_port()
1510 sysfs_remove_group(&port->dev->kobj, &port_attribute_group); in unplug_port()
1511 device_destroy(&port_class, port->dev->devt); in unplug_port()
1512 cdev_del(port->cdev); in unplug_port()
1514 debugfs_remove(port->debugfs_file); in unplug_port()
1515 kfree(port->name); in unplug_port()
1518 * Locks around here are not necessary - a port can't be in unplug_port()
1519 * opened after we removed the port struct from ports_list in unplug_port()
1522 kref_put(&port->kref, remove_port); in unplug_port()
1531 struct port *port; in handle_control_message() local
1535 cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); in handle_control_message()
1537 port = find_port_by_id(portdev, virtio32_to_cpu(vdev, cpkt->id)); in handle_control_message()
1538 if (!port && in handle_control_message()
1539 cpkt->event != cpu_to_virtio16(vdev, VIRTIO_CONSOLE_PORT_ADD)) { in handle_control_message()
1541 dev_dbg(&portdev->vdev->dev, in handle_control_message()
1542 "Invalid index %u in control packet\n", cpkt->id); in handle_control_message()
1546 switch (virtio16_to_cpu(vdev, cpkt->event)) { in handle_control_message()
1548 if (port) { in handle_control_message()
1549 dev_dbg(&portdev->vdev->dev, in handle_control_message()
1550 "Port %u already added\n", port->id); in handle_control_message()
1551 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); in handle_control_message()
1554 if (virtio32_to_cpu(vdev, cpkt->id) >= in handle_control_message()
1555 portdev->max_nr_ports) { in handle_control_message()
1556 dev_warn(&portdev->vdev->dev, in handle_control_message()
1557 "Request for adding port with " in handle_control_message()
1558 "out-of-bound id %u, max. supported id: %u\n", in handle_control_message()
1559 cpkt->id, portdev->max_nr_ports - 1); in handle_control_message()
1562 add_port(portdev, virtio32_to_cpu(vdev, cpkt->id)); in handle_control_message()
1565 unplug_port(port); in handle_control_message()
1568 if (!cpkt->value) in handle_control_message()
1570 if (is_console_port(port)) in handle_control_message()
1573 init_port_console(port); in handle_control_message()
1576 * Could remove the port here in case init fails - but in handle_control_message()
1586 if (!is_console_port(port)) in handle_control_message()
1589 memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), in handle_control_message()
1591 set_console_size(port, size.rows, size.cols); in handle_control_message()
1593 port->cons.hvc->irq_requested = 1; in handle_control_message()
1594 resize_console(port); in handle_control_message()
1598 port->host_connected = virtio16_to_cpu(vdev, cpkt->value); in handle_control_message()
1599 wake_up_interruptible(&port->waitqueue); in handle_control_message()
1601 * If the host port got closed and the host had any in handle_control_message()
1605 spin_lock_irq(&port->outvq_lock); in handle_control_message()
1606 reclaim_consumed_buffers(port); in handle_control_message()
1607 spin_unlock_irq(&port->outvq_lock); in handle_control_message()
1613 spin_lock_irq(&port->inbuf_lock); in handle_control_message()
1614 send_sigio_to_port(port); in handle_control_message()
1615 spin_unlock_irq(&port->inbuf_lock); in handle_control_message()
1622 if (port->name) in handle_control_message()
1629 name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; in handle_control_message()
1631 port->name = kmalloc(name_size, GFP_KERNEL); in handle_control_message()
1632 if (!port->name) { in handle_control_message()
1633 dev_err(port->dev, in handle_control_message()
1634 "Not enough space to store port name\n"); in handle_control_message()
1637 strscpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), in handle_control_message()
1642 * create it only if we have a name for the port. in handle_control_message()
1644 err = sysfs_create_group(&port->dev->kobj, in handle_control_message()
1647 dev_err(port->dev, in handle_control_message()
1656 kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); in handle_control_message()
1670 vq = portdev->c_ivq; in control_work_handler()
1672 spin_lock(&portdev->c_ivq_lock); in control_work_handler()
1674 spin_unlock(&portdev->c_ivq_lock); in control_work_handler()
1676 buf->len = min_t(size_t, len, buf->size); in control_work_handler()
1677 buf->offset = 0; in control_work_handler()
1679 handle_control_message(vq->vdev, portdev, buf); in control_work_handler()
1681 spin_lock(&portdev->c_ivq_lock); in control_work_handler()
1682 if (add_inbuf(portdev->c_ivq, buf) < 0) { in control_work_handler()
1683 dev_warn(&portdev->vdev->dev, in control_work_handler()
1688 spin_unlock(&portdev->c_ivq_lock); in control_work_handler()
1702 struct port *port; in out_intr() local
1704 port = find_port_by_vq(vq->vdev->priv, vq); in out_intr()
1705 if (!port) { in out_intr()
1710 wake_up_interruptible(&port->waitqueue); in out_intr()
1715 struct port *port; in in_intr() local
1718 port = find_port_by_vq(vq->vdev->priv, vq); in in_intr()
1719 if (!port) { in in_intr()
1724 spin_lock_irqsave(&port->inbuf_lock, flags); in in_intr()
1725 port->inbuf = get_inbuf(port); in in_intr()
1728 * Normally the port should not accept data when the port is in in_intr()
1731 * can be reached when a console port is not yet connected (no in in_intr()
1736 * A generic serial port will discard data if not connected, in in_intr()
1737 * while console ports and rproc-serial ports accepts data at in in_intr()
1738 * any time. rproc-serial is initiated with guest_connected to in in_intr()
1744 if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) in in_intr()
1745 discard_port_data(port); in in_intr()
1748 send_sigio_to_port(port); in in_intr()
1750 spin_unlock_irqrestore(&port->inbuf_lock, flags); in in_intr()
1752 wake_up_interruptible(&port->waitqueue); in in_intr()
1754 if (is_console_port(port) && hvc_poll(port->cons.hvc)) in in_intr()
1762 portdev = vq->vdev->priv; in control_intr()
1763 schedule_work(&portdev->control_work); in control_intr()
1770 portdev = vdev->priv; in config_intr()
1773 schedule_work(&portdev->config_work); in config_intr()
1783 struct port *port; in config_work_handler() local
1786 vdev = portdev->vdev; in config_work_handler()
1790 port = find_port_by_id(portdev, 0); in config_work_handler()
1791 set_console_size(port, rows, cols); in config_work_handler()
1798 * done per-port. in config_work_handler()
1800 resize_console(port); in config_work_handler()
1811 nr_ports = portdev->max_nr_ports; in init_vqs()
1816 portdev->in_vqs = kmalloc_array(nr_ports, sizeof(struct virtqueue *), in init_vqs()
1818 portdev->out_vqs = kmalloc_array(nr_ports, sizeof(struct virtqueue *), in init_vqs()
1820 if (!vqs || !vqs_info || !portdev->in_vqs || !portdev->out_vqs) { in init_vqs()
1821 err = -ENOMEM; in init_vqs()
1827 * spawns a console port first and also inits the vqs for port in init_vqs()
1839 vqs_info[j].name = "control-i"; in init_vqs()
1840 vqs_info[j + 1].name = "control-o"; in init_vqs()
1851 err = virtio_find_vqs(portdev->vdev, nr_queues, vqs, vqs_info, NULL); in init_vqs()
1856 portdev->in_vqs[0] = vqs[0]; in init_vqs()
1857 portdev->out_vqs[0] = vqs[1]; in init_vqs()
1860 portdev->c_ivq = vqs[j]; in init_vqs()
1861 portdev->c_ovq = vqs[j + 1]; in init_vqs()
1865 portdev->in_vqs[i] = vqs[j]; in init_vqs()
1866 portdev->out_vqs[i] = vqs[j + 1]; in init_vqs()
1875 kfree(portdev->out_vqs); in init_vqs()
1876 kfree(portdev->in_vqs); in init_vqs()
1891 virtio_device_for_each_vq(portdev->vdev, vq) { in remove_vqs()
1899 portdev->vdev->config->del_vqs(portdev->vdev); in remove_vqs()
1900 kfree(portdev->in_vqs); in remove_vqs()
1901 kfree(portdev->out_vqs); in remove_vqs()
1907 struct port *port, *port2; in virtcons_remove() local
1909 portdev = vdev->priv; in virtcons_remove()
1912 list_del(&portdev->list); in virtcons_remove()
1918 flush_work(&portdev->control_work); in virtcons_remove()
1920 flush_work(&portdev->config_work); in virtcons_remove()
1926 cancel_work_sync(&portdev->control_work); in virtcons_remove()
1928 cancel_work_sync(&portdev->config_work); in virtcons_remove()
1930 list_for_each_entry_safe(port, port2, &portdev->ports, list) in virtcons_remove()
1931 unplug_port(port); in virtcons_remove()
1933 unregister_chrdev(portdev->chr_major, "virtio-portsdev"); in virtcons_remove()
1937 * (device-side) queues. So there's no point in keeping the in virtcons_remove()
1940 * have to just stop using the port, as the vqs are going in virtcons_remove()
1953 * initialize each port found.
1962 if (!vdev->config->get && in virtcons_probe()
1965 dev_err(&vdev->dev, "%s failure: config access disabled\n", in virtcons_probe()
1967 return -EINVAL; in virtcons_probe()
1972 err = -ENOMEM; in virtcons_probe()
1976 /* Attach this portdev to this virtio_device, and vice-versa. */ in virtcons_probe()
1977 portdev->vdev = vdev; in virtcons_probe()
1978 vdev->priv = portdev; in virtcons_probe()
1980 portdev->chr_major = register_chrdev(0, "virtio-portsdev", in virtcons_probe()
1982 if (portdev->chr_major < 0) { in virtcons_probe()
1983 dev_err(&vdev->dev, in virtcons_probe()
1985 portdev->chr_major, vdev->index); in virtcons_probe()
1986 err = portdev->chr_major; in virtcons_probe()
1991 portdev->max_nr_ports = 1; in virtcons_probe()
1997 &portdev->max_nr_ports) == 0) { in virtcons_probe()
1998 if (portdev->max_nr_ports == 0 || in virtcons_probe()
1999 portdev->max_nr_ports > VIRTCONS_MAX_PORTS) { in virtcons_probe()
2000 dev_err(&vdev->dev, in virtcons_probe()
2002 portdev->max_nr_ports); in virtcons_probe()
2003 err = -EINVAL; in virtcons_probe()
2009 spin_lock_init(&portdev->ports_lock); in virtcons_probe()
2010 INIT_LIST_HEAD(&portdev->ports); in virtcons_probe()
2011 INIT_LIST_HEAD(&portdev->list); in virtcons_probe()
2013 INIT_WORK(&portdev->config_work, &config_work_handler); in virtcons_probe()
2014 INIT_WORK(&portdev->control_work, &control_work_handler); in virtcons_probe()
2017 spin_lock_init(&portdev->c_ivq_lock); in virtcons_probe()
2018 spin_lock_init(&portdev->c_ovq_lock); in virtcons_probe()
2023 dev_err(&vdev->dev, "Error %d initializing vqs\n", err); in virtcons_probe()
2027 virtio_device_ready(portdev->vdev); in virtcons_probe()
2030 err = fill_queue(portdev->c_ivq, &portdev->c_ivq_lock); in virtcons_probe()
2032 dev_err(&vdev->dev, in virtcons_probe()
2046 * For backward compatibility: Create a console port in virtcons_probe()
2053 list_add_tail(&portdev->list, &pdrvdata.portdevs); in virtcons_probe()
2062 unregister_chrdev(portdev->chr_major, "virtio-portsdev"); in virtcons_probe()
2095 struct port *port; in virtcons_freeze() local
2097 portdev = vdev->priv; in virtcons_freeze()
2102 virtqueue_disable_cb(portdev->c_ivq); in virtcons_freeze()
2103 cancel_work_sync(&portdev->control_work); in virtcons_freeze()
2104 cancel_work_sync(&portdev->config_work); in virtcons_freeze()
2110 virtqueue_disable_cb(portdev->c_ivq); in virtcons_freeze()
2112 list_for_each_entry(port, &portdev->ports, list) { in virtcons_freeze()
2113 virtqueue_disable_cb(port->in_vq); in virtcons_freeze()
2114 virtqueue_disable_cb(port->out_vq); in virtcons_freeze()
2117 * the port opened or closed. in virtcons_freeze()
2119 port->host_connected = false; in virtcons_freeze()
2120 remove_port_data(port); in virtcons_freeze()
2130 struct port *port; in virtcons_restore() local
2133 portdev = vdev->priv; in virtcons_restore()
2139 virtio_device_ready(portdev->vdev); in virtcons_restore()
2142 fill_queue(portdev->c_ivq, &portdev->c_ivq_lock); in virtcons_restore()
2144 list_for_each_entry(port, &portdev->ports, list) { in virtcons_restore()
2145 port->in_vq = portdev->in_vqs[port->id]; in virtcons_restore()
2146 port->out_vq = portdev->out_vqs[port->id]; in virtcons_restore()
2148 fill_queue(port->in_vq, &port->inbuf_lock); in virtcons_restore()
2150 /* Get port open/close status on the host */ in virtcons_restore()
2151 send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); in virtcons_restore()
2154 * If a port was open at the time of suspending, we in virtcons_restore()
2157 if (port->guest_connected) in virtcons_restore()
2158 send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); in virtcons_restore()
2195 pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); in virtio_console_init()