| /* |
| * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation |
| * Copyright (C) 2009, 2010 Red Hat, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include <linux/cdev.h> |
| #include <linux/debugfs.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/fs.h> |
| #include <linux/init.h> |
| #include <linux/list.h> |
| #include <linux/poll.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/virtio.h> |
| #include <linux/virtio_console.h> |
| #include <linux/wait.h> |
| #include <linux/workqueue.h> |
| #include "hvc_console.h" |
| |
| /* |
| * This is a global struct for storing common data for all the devices |
| * this driver handles. |
| * |
| * Mainly, it has a linked list for all the consoles in one place so |
| * that callbacks from hvc for get_chars(), put_chars() work properly |
| * across multiple devices and multiple ports per device. |
| */ |
| struct ports_driver_data { |
| /* Used for registering chardevs */ |
| struct class *class; |
| |
| /* Used for exporting per-port information to debugfs */ |
| struct dentry *debugfs_dir; |
| |
| /* List of all the devices we're handling */ |
| struct list_head portdevs; |
| |
| /* Number of devices this driver is handling */ |
| unsigned int index; |
| |
| /* |
| * This is used to keep track of the number of hvc consoles |
| * spawned by this driver. This number is given as the first |
| * argument to hvc_alloc(). To correctly map an initial |
| * console spawned via hvc_instantiate to the console being |
| * hooked up via hvc_alloc, we need to pass the same vtermno. |
| * |
| * We also just assume the first console being initialised was |
| * the first one that got used as the initial console. |
| */ |
| unsigned int next_vtermno; |
| |
| /* All the console devices handled by this driver */ |
| struct list_head consoles; |
| }; |
| static struct ports_driver_data pdrvdata; |
| |
| DEFINE_SPINLOCK(pdrvdata_lock); |
| |
| /* This struct holds information that's relevant only for console ports */ |
| struct console { |
| /* We'll place all consoles in a list in the pdrvdata struct */ |
| struct list_head list; |
| |
| /* The hvc device associated with this console port */ |
| struct hvc_struct *hvc; |
| |
| /* The size of the console */ |
| struct winsize ws; |
| |
| /* |
| * This number identifies the number that we used to register |
| * with hvc in hvc_instantiate() and hvc_alloc(); this is the |
| * number passed on by the hvc callbacks to us to |
| * differentiate between the other console ports handled by |
| * this driver |
| */ |
| u32 vtermno; |
| }; |
| |
| struct port_buffer { |
| char *buf; |
| |
| /* size of the buffer in *buf above */ |
| size_t size; |
| |
| /* used length of the buffer */ |
| size_t len; |
| /* offset in the buf from which to consume data */ |
| size_t offset; |
| }; |
| |
| /* |
| * This is a per-device struct that stores data common to all the |
| * ports for that device (vdev->priv). |
| */ |
| struct ports_device { |
| /* Next portdev in the list, head is in the pdrvdata struct */ |
| struct list_head list; |
| |
| /* |
| * Workqueue handlers where we process deferred work after |
| * notification |
| */ |
| struct work_struct control_work; |
| |
| struct list_head ports; |
| |
| /* To protect the list of ports */ |
| spinlock_t ports_lock; |
| |
| /* To protect the vq operations for the control channel */ |
| spinlock_t cvq_lock; |
| |
| /* The current config space is stored here */ |
| struct virtio_console_config config; |
| |
| /* The virtio device we're associated with */ |
| struct virtio_device *vdev; |
| |
| /* |
| * A couple of virtqueues for the control channel: one for |
| * guest->host transfers, one for host->guest transfers |
| */ |
| struct virtqueue *c_ivq, *c_ovq; |
| |
| /* Array of per-port IO virtqueues */ |
| struct virtqueue **in_vqs, **out_vqs; |
| |
| /* Used for numbering devices for sysfs and debugfs */ |
| unsigned int drv_index; |
| |
| /* Major number for this device. Ports will be created as minors. */ |
| int chr_major; |
| }; |
| |
| /* This struct holds the per-port data */ |
| struct port { |
| /* Next port in the list, head is in the ports_device */ |
| struct list_head list; |
| |
| /* Pointer to the parent virtio_console device */ |
| struct ports_device *portdev; |
| |
| /* The current buffer from which data has to be fed to readers */ |
| struct port_buffer *inbuf; |
| |
| /* |
| * To protect the operations on the in_vq associated with this |
| * port. Has to be a spinlock because it can be called from |
| * interrupt context (get_char()). |
| */ |
| spinlock_t inbuf_lock; |
| |
| /* Protect the operations on the out_vq. */ |
| spinlock_t outvq_lock; |
| |
| /* The IO vqs for this port */ |
| struct virtqueue *in_vq, *out_vq; |
| |
| /* File in the debugfs directory that exposes this port's information */ |
| struct dentry *debugfs_file; |
| |
| /* |
| * The entries in this struct will be valid if this port is |
| * hooked up to an hvc console |
| */ |
| struct console cons; |
| |
| /* Each port associates with a separate char device */ |
| struct cdev *cdev; |
| struct device *dev; |
| |
| /* A waitqueue for poll() or blocking read operations */ |
| wait_queue_head_t waitqueue; |
| |
| /* The 'name' of the port that we expose via sysfs properties */ |
| char *name; |
| |
| /* The 'id' to identify the port with the Host */ |
| u32 id; |
| |
| bool outvq_full; |
| |
| /* Is the host device open */ |
| bool host_connected; |
| |
| /* We should allow only one process to open a port */ |
| bool guest_connected; |
| }; |
| |
| /* This is the very early arch-specified put chars function. */ |
| static int (*early_put_chars)(u32, const char *, int); |
| |
| static struct port *find_port_by_vtermno(u32 vtermno) |
| { |
| struct port *port; |
| struct console *cons; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&pdrvdata_lock, flags); |
| list_for_each_entry(cons, &pdrvdata.consoles, list) { |
| if (cons->vtermno == vtermno) { |
| port = container_of(cons, struct port, cons); |
| goto out; |
| } |
| } |
| port = NULL; |
| out: |
| spin_unlock_irqrestore(&pdrvdata_lock, flags); |
| return port; |
| } |
| |
| static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, |
| dev_t dev) |
| { |
| struct port *port; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&portdev->ports_lock, flags); |
| list_for_each_entry(port, &portdev->ports, list) |
| if (port->cdev->dev == dev) |
| goto out; |
| port = NULL; |
| out: |
| spin_unlock_irqrestore(&portdev->ports_lock, flags); |
| |
| return port; |
| } |
| |
| static struct port *find_port_by_devt(dev_t dev) |
| { |
| struct ports_device *portdev; |
| struct port *port; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&pdrvdata_lock, flags); |
| list_for_each_entry(portdev, &pdrvdata.portdevs, list) { |
| port = find_port_by_devt_in_portdev(portdev, dev); |
| if (port) |
| goto out; |
| } |
| port = NULL; |
| out: |
| spin_unlock_irqrestore(&pdrvdata_lock, flags); |
| return port; |
| } |
| |
| static struct port *find_port_by_id(struct ports_device *portdev, u32 id) |
| { |
| struct port *port; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&portdev->ports_lock, flags); |
| list_for_each_entry(port, &portdev->ports, list) |
| if (port->id == id) |
| goto out; |
| port = NULL; |
| out: |
| spin_unlock_irqrestore(&portdev->ports_lock, flags); |
| |
| return port; |
| } |
| |
| static struct port *find_port_by_vq(struct ports_device *portdev, |
| struct virtqueue *vq) |
| { |
| struct port *port; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&portdev->ports_lock, flags); |
| list_for_each_entry(port, &portdev->ports, list) |
| if (port->in_vq == vq || port->out_vq == vq) |
| goto out; |
| port = NULL; |
| out: |
| spin_unlock_irqrestore(&portdev->ports_lock, flags); |
| return port; |
| } |
| |
| static bool is_console_port(struct port *port) |
| { |
| if (port->cons.hvc) |
| return true; |
| return false; |
| } |
| |
| static inline bool use_multiport(struct ports_device *portdev) |
| { |
| /* |
| * This condition can be true when put_chars is called from |
| * early_init |
| */ |
| if (!portdev->vdev) |
| return 0; |
| return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); |
| } |
| |
| static void free_buf(struct port_buffer *buf) |
| { |
| kfree(buf->buf); |
| kfree(buf); |
| } |
| |
| static struct port_buffer *alloc_buf(size_t buf_size) |
| { |
| struct port_buffer *buf; |
| |
| buf = kmalloc(sizeof(*buf), GFP_KERNEL); |
| if (!buf) |
| goto fail; |
| buf->buf = kzalloc(buf_size, GFP_KERNEL); |
| if (!buf->buf) |
| goto free_buf; |
| buf->len = 0; |
| buf->offset = 0; |
| buf->size = buf_size; |
| return buf; |
| |
| free_buf: |
| kfree(buf); |
| fail: |
| return NULL; |
| } |
| |
| /* Callers should take appropriate locks */ |
| static void *get_inbuf(struct port *port) |
| { |
| struct port_buffer *buf; |
| struct virtqueue *vq; |
| unsigned int len; |
| |
| vq = port->in_vq; |
| buf = virtqueue_get_buf(vq, &len); |
| if (buf) { |
| buf->len = len; |
| buf->offset = 0; |
| } |
| return buf; |
| } |
| |
| /* |
| * Create a scatter-gather list representing our input buffer and put |
| * it in the queue. |
| * |
| * Callers should take appropriate locks. |
| */ |
| static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) |
| { |
| struct scatterlist sg[1]; |
| int ret; |
| |
| sg_init_one(sg, buf->buf, buf->size); |
| |
| ret = virtqueue_add_buf(vq, sg, 0, 1, buf); |
| virtqueue_kick(vq); |
| return ret; |
| } |
| |
| /* Discard any unread data this port has. Callers lockers. */ |
| static void discard_port_data(struct port *port) |
| { |
| struct port_buffer *buf; |
| struct virtqueue *vq; |
| unsigned int len; |
| int ret; |
| |
| vq = port->in_vq; |
| if (port->inbuf) |
| buf = port->inbuf; |
| else |
| buf = virtqueue_get_buf(vq, &len); |
| |
| ret = 0; |
| while (buf) { |
| if (add_inbuf(vq, buf) < 0) { |
| ret++; |
| free_buf(buf); |
| } |
| buf = virtqueue_get_buf(vq, &len); |
| } |
| port->inbuf = NULL; |
| if (ret) |
| dev_warn(port->dev, "Errors adding %d buffers back to vq\n", |
| ret); |
| } |
| |
| static bool port_has_data(struct port *port) |
| { |
| unsigned long flags; |
| bool ret; |
| |
| spin_lock_irqsave(&port->inbuf_lock, flags); |
| if (port->inbuf) { |
| ret = true; |
| goto out; |
| } |
| port->inbuf = get_inbuf(port); |
| if (port->inbuf) { |
| ret = true; |
| goto out; |
| } |
| ret = false; |
| out: |
| spin_unlock_irqrestore(&port->inbuf_lock, flags); |
| return ret; |
| } |
| |
| static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, |
| unsigned int event, unsigned int value) |
| { |
| struct scatterlist sg[1]; |
| struct virtio_console_control cpkt; |
| struct virtqueue *vq; |
| unsigned int len; |
| |
| if (!use_multiport(portdev)) |
| return 0; |
| |
| cpkt.id = port_id; |
| cpkt.event = event; |
| cpkt.value = value; |
| |
| vq = portdev->c_ovq; |
| |
| sg_init_one(sg, &cpkt, sizeof(cpkt)); |
| if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) { |
| virtqueue_kick(vq); |
| while (!virtqueue_get_buf(vq, &len)) |
| cpu_relax(); |
| } |
| return 0; |
| } |
| |
| static ssize_t send_control_msg(struct port *port, unsigned int event, |
| unsigned int value) |
| { |
| /* Did the port get unplugged before userspace closed it? */ |
| if (port->portdev) |
| return __send_control_msg(port->portdev, port->id, event, value); |
| return 0; |
| } |
| |
| /* Callers must take the port->outvq_lock */ |
| static void reclaim_consumed_buffers(struct port *port) |
| { |
| void *buf; |
| unsigned int len; |
| |
| while ((buf = virtqueue_get_buf(port->out_vq, &len))) { |
| kfree(buf); |
| port->outvq_full = false; |
| } |
| } |
| |
| static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, |
| bool nonblock) |
| { |
| struct scatterlist sg[1]; |
| struct virtqueue *out_vq; |
| ssize_t ret; |
| unsigned long flags; |
| unsigned int len; |
| |
| out_vq = port->out_vq; |
| |
| spin_lock_irqsave(&port->outvq_lock, flags); |
| |
| reclaim_consumed_buffers(port); |
| |
| sg_init_one(sg, in_buf, in_count); |
| ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf); |
| |
| /* Tell Host to go! */ |
| virtqueue_kick(out_vq); |
| |
| if (ret < 0) { |
| in_count = 0; |
| goto done; |
| } |
| |
| if (ret == 0) |
| port->outvq_full = true; |
| |
| if (nonblock) |
| goto done; |
| |
| /* |
| * Wait till the host acknowledges it pushed out the data we |
| * sent. This is done for data from the hvc_console; the tty |
| * operations are performed with spinlocks held so we can't |
| * sleep here. An alternative would be to copy the data to a |
| * buffer and relax the spinning requirement. The downside is |
| * we need to kmalloc a GFP_ATOMIC buffer each time the |
| * console driver writes something out. |
| */ |
| while (!virtqueue_get_buf(out_vq, &len)) |
| cpu_relax(); |
| done: |
| spin_unlock_irqrestore(&port->outvq_lock, flags); |
| /* |
| * We're expected to return the amount of data we wrote -- all |
| * of it |
| */ |
| return in_count; |
| } |
| |
| /* |
| * Give out the data that's requested from the buffer that we have |
| * queued up. |
| */ |
| static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, |
| bool to_user) |
| { |
| struct port_buffer *buf; |
| unsigned long flags; |
| |
| if (!out_count || !port_has_data(port)) |
| return 0; |
| |
| buf = port->inbuf; |
| out_count = min(out_count, buf->len - buf->offset); |
| |
| if (to_user) { |
| ssize_t ret; |
| |
| ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); |
| if (ret) |
| return -EFAULT; |
| } else { |
| memcpy(out_buf, buf->buf + buf->offset, out_count); |
| } |
| |
| buf->offset += out_count; |
| |
| if (buf->offset == buf->len) { |
| /* |
| * We're done using all the data in this buffer. |
| * Re-queue so that the Host can send us more data. |
| */ |
| spin_lock_irqsave(&port->inbuf_lock, flags); |
| port->inbuf = NULL; |
| |
| if (add_inbuf(port->in_vq, buf) < 0) |
| dev_warn(port->dev, "failed add_buf\n"); |
| |
| spin_unlock_irqrestore(&port->inbuf_lock, flags); |
| } |
| /* Return the number of bytes actually copied */ |
| return out_count; |
| } |
| |
| /* The condition that must be true for polling to end */ |
| static bool will_read_block(struct port *port) |
| { |
| if (!port->guest_connected) { |
| /* Port got hot-unplugged. Let's exit. */ |
| return false; |
| } |
| return !port_has_data(port) && port->host_connected; |
| } |
| |
| static bool will_write_block(struct port *port) |
| { |
| bool ret; |
| |
| if (!port->guest_connected) { |
| /* Port got hot-unplugged. Let's exit. */ |
| return false; |
| } |
| if (!port->host_connected) |
| return true; |
| |
| spin_lock_irq(&port->outvq_lock); |
| /* |
| * Check if the Host has consumed any buffers since we last |
| * sent data (this is only applicable for nonblocking ports). |
| */ |
| reclaim_consumed_buffers(port); |
| ret = port->outvq_full; |
| spin_unlock_irq(&port->outvq_lock); |
| |
| return ret; |
| } |
| |
| static ssize_t port_fops_read(struct file *filp, char __user *ubuf, |
| size_t count, loff_t *offp) |
| { |
| struct port *port; |
| ssize_t ret; |
| |
| port = filp->private_data; |
| |
| if (!port_has_data(port)) { |
| /* |
| * If nothing's connected on the host just return 0 in |
| * case of list_empty; this tells the userspace app |
| * that there's no connection |
| */ |
| if (!port->host_connected) |
| return 0; |
| if (filp->f_flags & O_NONBLOCK) |
| return -EAGAIN; |
| |
| ret = wait_event_interruptible(port->waitqueue, |
| !will_read_block(port)); |
| if (ret < 0) |
| return ret; |
| } |
| /* Port got hot-unplugged. */ |
| if (!port->guest_connected) |
| return -ENODEV; |
| /* |
| * We could've received a disconnection message while we were |
| * waiting for more data. |
| * |
| * This check is not clubbed in the if() statement above as we |
| * might receive some data as well as the host could get |
| * disconnected after we got woken up from our wait. So we |
| * really want to give off whatever data we have and only then |
| * check for host_connected. |
| */ |
| if (!port_has_data(port) && !port->host_connected) |
| return 0; |
| |
| return fill_readbuf(port, ubuf, count, true); |
| } |
| |
| static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, |
| size_t count, loff_t *offp) |
| { |
| struct port *port; |
| char *buf; |
| ssize_t ret; |
| bool nonblock; |
| |
| /* Userspace could be out to fool us */ |
| if (!count) |
| return 0; |
| |
| port = filp->private_data; |
| |
| nonblock = filp->f_flags & O_NONBLOCK; |
| |
| if (will_write_block(port)) { |
| if (nonblock) |
| return -EAGAIN; |
| |
| ret = wait_event_interruptible(port->waitqueue, |
| !will_write_block(port)); |
| if (ret < 0) |
| return ret; |
| } |
| /* Port got hot-unplugged. */ |
| if (!port->guest_connected) |
| return -ENODEV; |
| |
| count = min((size_t)(32 * 1024), count); |
| |
| buf = kmalloc(count, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| ret = copy_from_user(buf, ubuf, count); |
| if (ret) { |
| ret = -EFAULT; |
| goto free_buf; |
| } |
| |
| /* |
| * We now ask send_buf() to not spin for generic ports -- we |
| * can re-use the same code path that non-blocking file |
| * descriptors take for blocking file descriptors since the |
| * wait is already done and we're certain the write will go |
| * through to the host. |
| */ |
| nonblock = true; |
| ret = send_buf(port, buf, count, nonblock); |
| |
| if (nonblock && ret > 0) |
| goto out; |
| |
| free_buf: |
| kfree(buf); |
| out: |
| return ret; |
| } |
| |
| static unsigned int port_fops_poll(struct file *filp, poll_table *wait) |
| { |
| struct port *port; |
| unsigned int ret; |
| |
| port = filp->private_data; |
| poll_wait(filp, &port->waitqueue, wait); |
| |
| if (!port->guest_connected) { |
| /* Port got unplugged */ |
| return POLLHUP; |
| } |
| ret = 0; |
| if (!will_read_block(port)) |
| ret |= POLLIN | POLLRDNORM; |
| if (!will_write_block(port)) |
| ret |= POLLOUT; |
| if (!port->host_connected) |
| ret |= POLLHUP; |
| |
| return ret; |
| } |
| |
| static int port_fops_release(struct inode *inode, struct file *filp) |
| { |
| struct port *port; |
| |
| port = filp->private_data; |
| |
| /* Notify host of port being closed */ |
| send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); |
| |
| spin_lock_irq(&port->inbuf_lock); |
| port->guest_connected = false; |
| |
| discard_port_data(port); |
| |
| spin_unlock_irq(&port->inbuf_lock); |
| |
| spin_lock_irq(&port->outvq_lock); |
| reclaim_consumed_buffers(port); |
| spin_unlock_irq(&port->outvq_lock); |
| |
| return 0; |
| } |
| |
| static int port_fops_open(struct inode *inode, struct file *filp) |
| { |
| struct cdev *cdev = inode->i_cdev; |
| struct port *port; |
| int ret; |
| |
| port = find_port_by_devt(cdev->dev); |
| filp->private_data = port; |
| |
| /* |
| * Don't allow opening of console port devices -- that's done |
| * via /dev/hvc |
| */ |
| if (is_console_port(port)) { |
| ret = -ENXIO; |
| goto out; |
| } |
| |
| /* Allow only one process to open a particular port at a time */ |
| spin_lock_irq(&port->inbuf_lock); |
| if (port->guest_connected) { |
| spin_unlock_irq(&port->inbuf_lock); |
| ret = -EMFILE; |
| goto out; |
| } |
| |
| port->guest_connected = true; |
| spin_unlock_irq(&port->inbuf_lock); |
| |
| spin_lock_irq(&port->outvq_lock); |
| /* |
| * There might be a chance that we missed reclaiming a few |
| * buffers in the window of the port getting previously closed |
| * and opening now. |
| */ |
| reclaim_consumed_buffers(port); |
| spin_unlock_irq(&port->outvq_lock); |
| |
| /* Notify host of port being opened */ |
| send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); |
| |
| return 0; |
| out: |
| return ret; |
| } |
| |
| /* |
| * The file operations that we support: programs in the guest can open |
| * a console device, read from it, write to it, poll for data and |
| * close it. The devices are at |
| * /dev/vport<device number>p<port number> |
| */ |
| static const struct file_operations port_fops = { |
| .owner = THIS_MODULE, |
| .open = port_fops_open, |
| .read = port_fops_read, |
| .write = port_fops_write, |
| .poll = port_fops_poll, |
| .release = port_fops_release, |
| }; |
| |
| /* |
| * The put_chars() callback is pretty straightforward. |
| * |
| * We turn the characters into a scatter-gather list, add it to the |
| * output queue and then kick the Host. Then we sit here waiting for |
| * it to finish: inefficient in theory, but in practice |
| * implementations will do it immediately (lguest's Launcher does). |
| */ |
| static int put_chars(u32 vtermno, const char *buf, int count) |
| { |
| struct port *port; |
| |
| if (unlikely(early_put_chars)) |
| return early_put_chars(vtermno, buf, count); |
| |
| port = find_port_by_vtermno(vtermno); |
| if (!port) |
| return -EPIPE; |
| |
| return send_buf(port, (void *)buf, count, false); |
| } |
| |
| /* |
| * get_chars() is the callback from the hvc_console infrastructure |
| * when an interrupt is received. |
| * |
| * We call out to fill_readbuf that gets us the required data from the |
| * buffers that are queued up. |
| */ |
| static int get_chars(u32 vtermno, char *buf, int count) |
| { |
| struct port *port; |
| |
| /* If we've not set up the port yet, we have no input to give. */ |
| if (unlikely(early_put_chars)) |
| return 0; |
| |
| port = find_port_by_vtermno(vtermno); |
| if (!port) |
| return -EPIPE; |
| |
| /* If we don't have an input queue yet, we can't get input. */ |
| BUG_ON(!port->in_vq); |
| |
| return fill_readbuf(port, buf, count, false); |
| } |
| |
| static void resize_console(struct port *port) |
| { |
| struct virtio_device *vdev; |
| |
| /* The port could have been hot-unplugged */ |
| if (!port || !is_console_port(port)) |
| return; |
| |
| vdev = port->portdev->vdev; |
| if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) |
| hvc_resize(port->cons.hvc, port->cons.ws); |
| } |
| |
| /* We set the configuration at this point, since we now have a tty */ |
| static int notifier_add_vio(struct hvc_struct *hp, int data) |
| { |
| struct port *port; |
| |
| port = find_port_by_vtermno(hp->vtermno); |
| if (!port) |
| return -EINVAL; |
| |
| hp->irq_requested = 1; |
| resize_console(port); |
| |
| return 0; |
| } |
| |
| static void notifier_del_vio(struct hvc_struct *hp, int data) |
| { |
| hp->irq_requested = 0; |
| } |
| |
| /* The operations for console ports. */ |
| static const struct hv_ops hv_ops = { |
| .get_chars = get_chars, |
| .put_chars = put_chars, |
| .notifier_add = notifier_add_vio, |
| .notifier_del = notifier_del_vio, |
| .notifier_hangup = notifier_del_vio, |
| }; |
| |
| /* |
| * Console drivers are initialized very early so boot messages can go |
| * out, so we do things slightly differently from the generic virtio |
| * initialization of the net and block drivers. |
| * |
| * At this stage, the console is output-only. It's too early to set |
| * up a virtqueue, so we let the drivers do some boutique early-output |
| * thing. |
| */ |
| int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) |
| { |
| early_put_chars = put_chars; |
| return hvc_instantiate(0, 0, &hv_ops); |
| } |
| |
| int init_port_console(struct port *port) |
| { |
| int ret; |
| |
| /* |
| * The Host's telling us this port is a console port. Hook it |
| * up with an hvc console. |
| * |
| * To set up and manage our virtual console, we call |
| * hvc_alloc(). |
| * |
| * The first argument of hvc_alloc() is the virtual console |
| * number. The second argument is the parameter for the |
| * notification mechanism (like irq number). We currently |
| * leave this as zero, virtqueues have implicit notifications. |
| * |
| * The third argument is a "struct hv_ops" containing the |
| * put_chars() get_chars(), notifier_add() and notifier_del() |
| * pointers. The final argument is the output buffer size: we |
| * can do any size, so we put PAGE_SIZE here. |
| */ |
| port->cons.vtermno = pdrvdata.next_vtermno; |
| |
| port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); |
| if (IS_ERR(port->cons.hvc)) { |
| ret = PTR_ERR(port->cons.hvc); |
| dev_err(port->dev, |
| "error %d allocating hvc for port\n", ret); |
| port->cons.hvc = NULL; |
| return ret; |
| } |
| spin_lock_irq(&pdrvdata_lock); |
| pdrvdata.next_vtermno++; |
| list_add_tail(&port->cons.list, &pdrvdata.consoles); |
| spin_unlock_irq(&pdrvdata_lock); |
| port->guest_connected = true; |
| |
| /* |
| * Start using the new console output if this is the first |
| * console to come up. |
| */ |
| if (early_put_chars) |
| early_put_chars = NULL; |
| |
| /* Notify host of port being opened */ |
| send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); |
| |
| return 0; |
| } |
| |
| static ssize_t show_port_name(struct device *dev, |
| struct device_attribute *attr, char *buffer) |
| { |
| struct port *port; |
| |
| port = dev_get_drvdata(dev); |
| |
| return sprintf(buffer, "%s\n", port->name); |
| } |
| |
| static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); |
| |
| static struct attribute *port_sysfs_entries[] = { |
| &dev_attr_name.attr, |
| NULL |
| }; |
| |
| static struct attribute_group port_attribute_group = { |
| .name = NULL, /* put in device directory */ |
| .attrs = port_sysfs_entries, |
| }; |
| |
| static int debugfs_open(struct inode *inode, struct file *filp) |
| { |
| filp->private_data = inode->i_private; |
| return 0; |
| } |
| |
| static ssize_t debugfs_read(struct file *filp, char __user *ubuf, |
| size_t count, loff_t *offp) |
| { |
| struct port *port; |
| char *buf; |
| ssize_t ret, out_offset, out_count; |
| |
| out_count = 1024; |
| buf = kmalloc(out_count, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| port = filp->private_data; |
| out_offset = 0; |
| out_offset += snprintf(buf + out_offset, out_count, |
| "name: %s\n", port->name ? port->name : ""); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "guest_connected: %d\n", port->guest_connected); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "host_connected: %d\n", port->host_connected); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "outvq_full: %d\n", port->outvq_full); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "is_console: %s\n", |
| is_console_port(port) ? "yes" : "no"); |
| out_offset += snprintf(buf + out_offset, out_count - out_offset, |
| "console_vtermno: %u\n", port->cons.vtermno); |
| |
| ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); |
| kfree(buf); |
| return ret; |
| } |
| |
| static const struct file_operations port_debugfs_ops = { |
| .owner = THIS_MODULE, |
| .open = debugfs_open, |
| .read = debugfs_read, |
| }; |
| |
| static void set_console_size(struct port *port, u16 rows, u16 cols) |
| { |
| if (!port || !is_console_port(port)) |
| return; |
| |
| port->cons.ws.ws_row = rows; |
| port->cons.ws.ws_col = cols; |
| } |
| |
| static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) |
| { |
| struct port_buffer *buf; |
| unsigned int nr_added_bufs; |
| int ret; |
| |
| nr_added_bufs = 0; |
| do { |
| buf = alloc_buf(PAGE_SIZE); |
| if (!buf) |
| break; |
| |
| spin_lock_irq(lock); |
| ret = add_inbuf(vq, buf); |
| if (ret < 0) { |
| spin_unlock_irq(lock); |
| free_buf(buf); |
| break; |
| } |
| nr_added_bufs++; |
| spin_unlock_irq(lock); |
| } while (ret > 0); |
| |
| return nr_added_bufs; |
| } |
| |
| static int add_port(struct ports_device *portdev, u32 id) |
| { |
| char debugfs_name[16]; |
| struct port *port; |
| struct port_buffer *buf; |
| dev_t devt; |
| unsigned int nr_added_bufs; |
| int err; |
| |
| port = kmalloc(sizeof(*port), GFP_KERNEL); |
| if (!port) { |
| err = -ENOMEM; |
| goto fail; |
| } |
| |
| port->portdev = portdev; |
| port->id = id; |
| |
| port->name = NULL; |
| port->inbuf = NULL; |
| port->cons.hvc = NULL; |
| |
| port->cons.ws.ws_row = port->cons.ws.ws_col = 0; |
| |
| port->host_connected = port->guest_connected = false; |
| |
| port->outvq_full = false; |
| |
| port->in_vq = portdev->in_vqs[port->id]; |
| port->out_vq = portdev->out_vqs[port->id]; |
| |
| port->cdev = cdev_alloc(); |
| if (!port->cdev) { |
| dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); |
| err = -ENOMEM; |
| goto free_port; |
| } |
| port->cdev->ops = &port_fops; |
| |
| devt = MKDEV(portdev->chr_major, id); |
| err = cdev_add(port->cdev, devt, 1); |
| if (err < 0) { |
| dev_err(&port->portdev->vdev->dev, |
| "Error %d adding cdev for port %u\n", err, id); |
| goto free_cdev; |
| } |
| port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, |
| devt, port, "vport%up%u", |
| port->portdev->drv_index, id); |
| if (IS_ERR(port->dev)) { |
| err = PTR_ERR(port->dev); |
| dev_err(&port->portdev->vdev->dev, |
| "Error %d creating device for port %u\n", |
| err, id); |
| goto free_cdev; |
| } |
| |
| spin_lock_init(&port->inbuf_lock); |
| spin_lock_init(&port->outvq_lock); |
| init_waitqueue_head(&port->waitqueue); |
| |
| /* Fill the in_vq with buffers so the host can send us data. */ |
| nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); |
| if (!nr_added_bufs) { |
| dev_err(port->dev, "Error allocating inbufs\n"); |
| err = -ENOMEM; |
| goto free_device; |
| } |
| |
| /* |
| * If we're not using multiport support, this has to be a console port |
| */ |
| if (!use_multiport(port->portdev)) { |
| err = init_port_console(port); |
| if (err) |
| goto free_inbufs; |
| } |
| |
| spin_lock_irq(&portdev->ports_lock); |
| list_add_tail(&port->list, &port->portdev->ports); |
| spin_unlock_irq(&portdev->ports_lock); |
| |
| /* |
| * Tell the Host we're set so that it can send us various |
| * configuration parameters for this port (eg, port name, |
| * caching, whether this is a console port, etc.) |
| */ |
| send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
| |
| if (pdrvdata.debugfs_dir) { |
| /* |
| * Finally, create the debugfs file that we can use to |
| * inspect a port's state at any time |
| */ |
| sprintf(debugfs_name, "vport%up%u", |
| port->portdev->drv_index, id); |
| port->debugfs_file = debugfs_create_file(debugfs_name, 0444, |
| pdrvdata.debugfs_dir, |
| port, |
| &port_debugfs_ops); |
| } |
| return 0; |
| |
| free_inbufs: |
| while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
| free_buf(buf); |
| free_device: |
| device_destroy(pdrvdata.class, port->dev->devt); |
| free_cdev: |
| cdev_del(port->cdev); |
| free_port: |
| kfree(port); |
| fail: |
| /* The host might want to notify management sw about port add failure */ |
| __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); |
| return err; |
| } |
| |
| /* Remove all port-specific data. */ |
| static void remove_port(struct port *port) |
| { |
| struct port_buffer *buf; |
| |
| if (port->guest_connected) { |
| port->guest_connected = false; |
| port->host_connected = false; |
| wake_up_interruptible(&port->waitqueue); |
| send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); |
| } |
| |
| spin_lock_irq(&port->portdev->ports_lock); |
| list_del(&port->list); |
| spin_unlock_irq(&port->portdev->ports_lock); |
| |
| if (is_console_port(port)) { |
| spin_lock_irq(&pdrvdata_lock); |
| list_del(&port->cons.list); |
| spin_unlock_irq(&pdrvdata_lock); |
| #if 0 |
| /* |
| * hvc_remove() not called as removing one hvc port |
| * results in other hvc ports getting frozen. |
| * |
| * Once this is resolved in hvc, this functionality |
| * will be enabled. Till that is done, the -EPIPE |
| * return from get_chars() above will help |
| * hvc_console.c to clean up on ports we remove here. |
| */ |
| hvc_remove(port->cons.hvc); |
| #endif |
| } |
| sysfs_remove_group(&port->dev->kobj, &port_attribute_group); |
| device_destroy(pdrvdata.class, port->dev->devt); |
| cdev_del(port->cdev); |
| |
| /* Remove unused data this port might have received. */ |
| discard_port_data(port); |
| |
| reclaim_consumed_buffers(port); |
| |
| /* Remove buffers we queued up for the Host to send us data in. */ |
| while ((buf = virtqueue_detach_unused_buf(port->in_vq))) |
| free_buf(buf); |
| |
| kfree(port->name); |
| |
| debugfs_remove(port->debugfs_file); |
| |
| kfree(port); |
| } |
| |
| /* Any private messages that the Host and Guest want to share */ |
| static void handle_control_message(struct ports_device *portdev, |
| struct port_buffer *buf) |
| { |
| struct virtio_console_control *cpkt; |
| struct port *port; |
| size_t name_size; |
| int err; |
| |
| cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); |
| |
| port = find_port_by_id(portdev, cpkt->id); |
| if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { |
| /* No valid header at start of buffer. Drop it. */ |
| dev_dbg(&portdev->vdev->dev, |
| "Invalid index %u in control packet\n", cpkt->id); |
| return; |
| } |
| |
| switch (cpkt->event) { |
| case VIRTIO_CONSOLE_PORT_ADD: |
| if (port) { |
| dev_dbg(&portdev->vdev->dev, |
| "Port %u already added\n", port->id); |
| send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); |
| break; |
| } |
| if (cpkt->id >= portdev->config.max_nr_ports) { |
| dev_warn(&portdev->vdev->dev, |
| "Request for adding port with out-of-bound id %u, max. supported id: %u\n", |
| cpkt->id, portdev->config.max_nr_ports - 1); |
| break; |
| } |
| add_port(portdev, cpkt->id); |
| break; |
| case VIRTIO_CONSOLE_PORT_REMOVE: |
| remove_port(port); |
| break; |
| case VIRTIO_CONSOLE_CONSOLE_PORT: |
| if (!cpkt->value) |
| break; |
| if (is_console_port(port)) |
| break; |
| |
| init_port_console(port); |
| /* |
| * Could remove the port here in case init fails - but |
| * have to notify the host first. |
| */ |
| break; |
| case VIRTIO_CONSOLE_RESIZE: { |
| struct { |
| __u16 rows; |
| __u16 cols; |
| } size; |
| |
| if (!is_console_port(port)) |
| break; |
| |
| memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), |
| sizeof(size)); |
| set_console_size(port, size.rows, size.cols); |
| |
| port->cons.hvc->irq_requested = 1; |
| resize_console(port); |
| break; |
| } |
| case VIRTIO_CONSOLE_PORT_OPEN: |
| port->host_connected = cpkt->value; |
| wake_up_interruptible(&port->waitqueue); |
| /* |
| * If the host port got closed and the host had any |
| * unconsumed buffers, we'll be able to reclaim them |
| * now. |
| */ |
| spin_lock_irq(&port->outvq_lock); |
| reclaim_consumed_buffers(port); |
| spin_unlock_irq(&port->outvq_lock); |
| break; |
| case VIRTIO_CONSOLE_PORT_NAME: |
| /* |
| * Skip the size of the header and the cpkt to get the size |
| * of the name that was sent |
| */ |
| name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; |
| |
| port->name = kmalloc(name_size, GFP_KERNEL); |
| if (!port->name) { |
| dev_err(port->dev, |
| "Not enough space to store port name\n"); |
| break; |
| } |
| strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), |
| name_size - 1); |
| port->name[name_size - 1] = 0; |
| |
| /* |
| * Since we only have one sysfs attribute, 'name', |
| * create it only if we have a name for the port. |
| */ |
| err = sysfs_create_group(&port->dev->kobj, |
| &port_attribute_group); |
| if (err) { |
| dev_err(port->dev, |
| "Error %d creating sysfs device attributes\n", |
| err); |
| } else { |
| /* |
| * Generate a udev event so that appropriate |
| * symlinks can be created based on udev |
| * rules. |
| */ |
| kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); |
| } |
| break; |
| } |
| } |
| |
| static void control_work_handler(struct work_struct *work) |
| { |
| struct ports_device *portdev; |
| struct virtqueue *vq; |
| struct port_buffer *buf; |
| unsigned int len; |
| |
| portdev = container_of(work, struct ports_device, control_work); |
| vq = portdev->c_ivq; |
| |
| spin_lock(&portdev->cvq_lock); |
| while ((buf = virtqueue_get_buf(vq, &len))) { |
| spin_unlock(&portdev->cvq_lock); |
| |
| buf->len = len; |
| buf->offset = 0; |
| |
| handle_control_message(portdev, buf); |
| |
| spin_lock(&portdev->cvq_lock); |
| if (add_inbuf(portdev->c_ivq, buf) < 0) { |
| dev_warn(&portdev->vdev->dev, |
| "Error adding buffer to queue\n"); |
| free_buf(buf); |
| } |
| } |
| spin_unlock(&portdev->cvq_lock); |
| } |
| |
| static void in_intr(struct virtqueue *vq) |
| { |
| struct port *port; |
| unsigned long flags; |
| |
| port = find_port_by_vq(vq->vdev->priv, vq); |
| if (!port) |
| return; |
| |
| spin_lock_irqsave(&port->inbuf_lock, flags); |
| if (!port->inbuf) |
| port->inbuf = get_inbuf(port); |
| |
| /* |
| * Don't queue up data when port is closed. This condition |
| * can be reached when a console port is not yet connected (no |
| * tty is spawned) and the host sends out data to console |
| * ports. For generic serial ports, the host won't |
| * (shouldn't) send data till the guest is connected. |
| */ |
| if (!port->guest_connected) |
| discard_port_data(port); |
| |
| spin_unlock_irqrestore(&port->inbuf_lock, flags); |
| |
| wake_up_interruptible(&port->waitqueue); |
| |
| if (is_console_port(port) && hvc_poll(port->cons.hvc)) |
| hvc_kick(); |
| } |
| |
| static void control_intr(struct virtqueue *vq) |
| { |
| struct ports_device *portdev; |
| |
| portdev = vq->vdev->priv; |
| schedule_work(&portdev->control_work); |
| } |
| |
| static void config_intr(struct virtio_device *vdev) |
| { |
| struct ports_device *portdev; |
| |
| portdev = vdev->priv; |
| |
| if (!use_multiport(portdev)) { |
| struct port *port; |
| u16 rows, cols; |
| |
| vdev->config->get(vdev, |
| offsetof(struct virtio_console_config, cols), |
| &cols, sizeof(u16)); |
| vdev->config->get(vdev, |
| offsetof(struct virtio_console_config, rows), |
| &rows, sizeof(u16)); |
| |
| port = find_port_by_id(portdev, 0); |
| set_console_size(port, rows, cols); |
| |
| /* |
| * We'll use this way of resizing only for legacy |
| * support. For newer userspace |
| * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages |
| * to indicate console size changes so that it can be |
| * done per-port. |
| */ |
| resize_console(port); |
| } |
| } |
| |
| static int init_vqs(struct ports_device *portdev) |
| { |
| vq_callback_t **io_callbacks; |
| char **io_names; |
| struct virtqueue **vqs; |
| u32 i, j, nr_ports, nr_queues; |
| int err; |
| |
| nr_ports = portdev->config.max_nr_ports; |
| nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; |
| |
| vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); |
| if (!vqs) { |
| err = -ENOMEM; |
| goto fail; |
| } |
| io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); |
| if (!io_callbacks) { |
| err = -ENOMEM; |
| goto free_vqs; |
| } |
| io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); |
| if (!io_names) { |
| err = -ENOMEM; |
| goto free_callbacks; |
| } |
| portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
| GFP_KERNEL); |
| if (!portdev->in_vqs) { |
| err = -ENOMEM; |
| goto free_names; |
| } |
| portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), |
| GFP_KERNEL); |
| if (!portdev->out_vqs) { |
| err = -ENOMEM; |
| goto free_invqs; |
| } |
| |
| /* |
| * For backward compat (newer host but older guest), the host |
| * spawns a console port first and also inits the vqs for port |
| * 0 before others. |
| */ |
| j = 0; |
| io_callbacks[j] = in_intr; |
| io_callbacks[j + 1] = NULL; |
| io_names[j] = "input"; |
| io_names[j + 1] = "output"; |
| j += 2; |
| |
| if (use_multiport(portdev)) { |
| io_callbacks[j] = control_intr; |
| io_callbacks[j + 1] = NULL; |
| io_names[j] = "control-i"; |
| io_names[j + 1] = "control-o"; |
| |
| for (i = 1; i < nr_ports; i++) { |
| j += 2; |
| io_callbacks[j] = in_intr; |
| io_callbacks[j + 1] = NULL; |
| io_names[j] = "input"; |
| io_names[j + 1] = "output"; |
| } |
| } |
| /* Find the queues. */ |
| err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, |
| io_callbacks, |
| (const char **)io_names); |
| if (err) |
| goto free_outvqs; |
| |
| j = 0; |
| portdev->in_vqs[0] = vqs[0]; |
| portdev->out_vqs[0] = vqs[1]; |
| j += 2; |
| if (use_multiport(portdev)) { |
| portdev->c_ivq = vqs[j]; |
| portdev->c_ovq = vqs[j + 1]; |
| |
| for (i = 1; i < nr_ports; i++) { |
| j += 2; |
| portdev->in_vqs[i] = vqs[j]; |
| portdev->out_vqs[i] = vqs[j + 1]; |
| } |
| } |
| kfree(io_callbacks); |
| kfree(io_names); |
| kfree(vqs); |
| |
| return 0; |
| |
| free_names: |
| kfree(io_names); |
| free_callbacks: |
| kfree(io_callbacks); |
| free_outvqs: |
| kfree(portdev->out_vqs); |
| free_invqs: |
| kfree(portdev->in_vqs); |
| free_vqs: |
| kfree(vqs); |
| fail: |
| return err; |
| } |
| |
| static const struct file_operations portdev_fops = { |
| .owner = THIS_MODULE, |
| }; |
| |
| /* |
| * Once we're further in boot, we get probed like any other virtio |
| * device. |
| * |
| * If the host also supports multiple console ports, we check the |
| * config space to see how many ports the host has spawned. We |
| * initialize each port found. |
| */ |
| static int __devinit virtcons_probe(struct virtio_device *vdev) |
| { |
| struct ports_device *portdev; |
| int err; |
| bool multiport; |
| |
| portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); |
| if (!portdev) { |
| err = -ENOMEM; |
| goto fail; |
| } |
| |
| /* Attach this portdev to this virtio_device, and vice-versa. */ |
| portdev->vdev = vdev; |
| vdev->priv = portdev; |
| |
| spin_lock_irq(&pdrvdata_lock); |
| portdev->drv_index = pdrvdata.index++; |
| spin_unlock_irq(&pdrvdata_lock); |
| |
| portdev->chr_major = register_chrdev(0, "virtio-portsdev", |
| &portdev_fops); |
| if (portdev->chr_major < 0) { |
| dev_err(&vdev->dev, |
| "Error %d registering chrdev for device %u\n", |
| portdev->chr_major, portdev->drv_index); |
| err = portdev->chr_major; |
| goto free; |
| } |
| |
| multiport = false; |
| portdev->config.max_nr_ports = 1; |
| if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { |
| multiport = true; |
| vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; |
| |
| vdev->config->get(vdev, offsetof(struct virtio_console_config, |
| max_nr_ports), |
| &portdev->config.max_nr_ports, |
| sizeof(portdev->config.max_nr_ports)); |
| } |
| |
| /* Let the Host know we support multiple ports.*/ |
| vdev->config->finalize_features(vdev); |
| |
| err = init_vqs(portdev); |
| if (err < 0) { |
| dev_err(&vdev->dev, "Error %d initializing vqs\n", err); |
| goto free_chrdev; |
| } |
| |
| spin_lock_init(&portdev->ports_lock); |
| INIT_LIST_HEAD(&portdev->ports); |
| |
| if (multiport) { |
| unsigned int nr_added_bufs; |
| |
| spin_lock_init(&portdev->cvq_lock); |
| INIT_WORK(&portdev->control_work, &control_work_handler); |
| |
| nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); |
| if (!nr_added_bufs) { |
| dev_err(&vdev->dev, |
| "Error allocating buffers for control queue\n"); |
| err = -ENOMEM; |
| goto free_vqs; |
| } |
| } else { |
| /* |
| * For backward compatibility: Create a console port |
| * if we're running on older host. |
| */ |
| add_port(portdev, 0); |
| } |
| |
| spin_lock_irq(&pdrvdata_lock); |
| list_add_tail(&portdev->list, &pdrvdata.portdevs); |
| spin_unlock_irq(&pdrvdata_lock); |
| |
| __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
| VIRTIO_CONSOLE_DEVICE_READY, 1); |
| return 0; |
| |
| free_vqs: |
| /* The host might want to notify mgmt sw about device add failure */ |
| __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, |
| VIRTIO_CONSOLE_DEVICE_READY, 0); |
| vdev->config->del_vqs(vdev); |
| kfree(portdev->in_vqs); |
| kfree(portdev->out_vqs); |
| free_chrdev: |
| unregister_chrdev(portdev->chr_major, "virtio-portsdev"); |
| free: |
| kfree(portdev); |
| fail: |
| return err; |
| } |
| |
| static void virtcons_remove(struct virtio_device *vdev) |
| { |
| struct ports_device *portdev; |
| struct port *port, *port2; |
| |
| portdev = vdev->priv; |
| |
| spin_lock_irq(&pdrvdata_lock); |
| list_del(&portdev->list); |
| spin_unlock_irq(&pdrvdata_lock); |
| |
| /* Disable interrupts for vqs */ |
| vdev->config->reset(vdev); |
| /* Finish up work that's lined up */ |
| cancel_work_sync(&portdev->control_work); |
| |
| list_for_each_entry_safe(port, port2, &portdev->ports, list) |
| remove_port(port); |
| |
| unregister_chrdev(portdev->chr_major, "virtio-portsdev"); |
| |
| if (use_multiport(portdev)) { |
| struct port_buffer *buf; |
| unsigned int len; |
| |
| while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) |
| free_buf(buf); |
| |
| while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) |
| free_buf(buf); |
| } |
| |
| vdev->config->del_vqs(vdev); |
| kfree(portdev->in_vqs); |
| kfree(portdev->out_vqs); |
| |
| kfree(portdev); |
| } |
| |
| static struct virtio_device_id id_table[] = { |
| { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, |
| { 0 }, |
| }; |
| |
| static unsigned int features[] = { |
| VIRTIO_CONSOLE_F_SIZE, |
| VIRTIO_CONSOLE_F_MULTIPORT, |
| }; |
| |
| static struct virtio_driver virtio_console = { |
| .feature_table = features, |
| .feature_table_size = ARRAY_SIZE(features), |
| .driver.name = KBUILD_MODNAME, |
| .driver.owner = THIS_MODULE, |
| .id_table = id_table, |
| .probe = virtcons_probe, |
| .remove = virtcons_remove, |
| .config_changed = config_intr, |
| }; |
| |
| static int __init init(void) |
| { |
| int err; |
| |
| pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); |
| if (IS_ERR(pdrvdata.class)) { |
| err = PTR_ERR(pdrvdata.class); |
| pr_err("Error %d creating virtio-ports class\n", err); |
| return err; |
| } |
| |
| pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); |
| if (!pdrvdata.debugfs_dir) { |
| pr_warning("Error %ld creating debugfs dir for virtio-ports\n", |
| PTR_ERR(pdrvdata.debugfs_dir)); |
| } |
| INIT_LIST_HEAD(&pdrvdata.consoles); |
| INIT_LIST_HEAD(&pdrvdata.portdevs); |
| |
| return register_virtio_driver(&virtio_console); |
| } |
| |
| static void __exit fini(void) |
| { |
| unregister_virtio_driver(&virtio_console); |
| |
| class_destroy(pdrvdata.class); |
| if (pdrvdata.debugfs_dir) |
| debugfs_remove_recursive(pdrvdata.debugfs_dir); |
| } |
| module_init(init); |
| module_exit(fini); |
| |
| MODULE_DEVICE_TABLE(virtio, id_table); |
| MODULE_DESCRIPTION("Virtio console driver"); |
| MODULE_LICENSE("GPL"); |