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@@ -0,0 +1,1240 @@
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+/*
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+ * (c) 2017 Stefano Stabellini <stefano@aporeto.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/inet.h>
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+#include <linux/kthread.h>
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+#include <linux/list.h>
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+#include <linux/radix-tree.h>
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+#include <linux/module.h>
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+#include <linux/semaphore.h>
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+#include <linux/wait.h>
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+#include <net/sock.h>
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+#include <net/inet_common.h>
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+#include <net/inet_connection_sock.h>
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+#include <net/request_sock.h>
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+
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+#include <xen/events.h>
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+#include <xen/grant_table.h>
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+#include <xen/xen.h>
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+#include <xen/xenbus.h>
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+#include <xen/interface/io/pvcalls.h>
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+
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+#define PVCALLS_VERSIONS "1"
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+#define MAX_RING_ORDER XENBUS_MAX_RING_GRANT_ORDER
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+
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+struct pvcalls_back_global {
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+ struct list_head frontends;
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+ struct semaphore frontends_lock;
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+} pvcalls_back_global;
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+
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+/*
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+ * Per-frontend data structure. It contains pointers to the command
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+ * ring, its event channel, a list of active sockets and a tree of
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+ * passive sockets.
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+ */
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+struct pvcalls_fedata {
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+ struct list_head list;
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+ struct xenbus_device *dev;
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+ struct xen_pvcalls_sring *sring;
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+ struct xen_pvcalls_back_ring ring;
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+ int irq;
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+ struct list_head socket_mappings;
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+ struct radix_tree_root socketpass_mappings;
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+ struct semaphore socket_lock;
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+};
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+
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+struct pvcalls_ioworker {
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+ struct work_struct register_work;
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+ struct workqueue_struct *wq;
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+};
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+
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+struct sock_mapping {
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+ struct list_head list;
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+ struct pvcalls_fedata *fedata;
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+ struct sockpass_mapping *sockpass;
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+ struct socket *sock;
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+ uint64_t id;
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+ grant_ref_t ref;
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+ struct pvcalls_data_intf *ring;
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+ void *bytes;
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+ struct pvcalls_data data;
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+ uint32_t ring_order;
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+ int irq;
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+ atomic_t read;
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+ atomic_t write;
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+ atomic_t io;
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+ atomic_t release;
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+ void (*saved_data_ready)(struct sock *sk);
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+ struct pvcalls_ioworker ioworker;
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+};
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+
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+struct sockpass_mapping {
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+ struct list_head list;
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+ struct pvcalls_fedata *fedata;
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+ struct socket *sock;
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+ uint64_t id;
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+ struct xen_pvcalls_request reqcopy;
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+ spinlock_t copy_lock;
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+ struct workqueue_struct *wq;
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+ struct work_struct register_work;
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+ void (*saved_data_ready)(struct sock *sk);
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+};
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+
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+static irqreturn_t pvcalls_back_conn_event(int irq, void *sock_map);
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+static int pvcalls_back_release_active(struct xenbus_device *dev,
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+ struct pvcalls_fedata *fedata,
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+ struct sock_mapping *map);
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+
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+static void pvcalls_conn_back_read(void *opaque)
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+{
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+ struct sock_mapping *map = (struct sock_mapping *)opaque;
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+ struct msghdr msg;
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+ struct kvec vec[2];
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+ RING_IDX cons, prod, size, wanted, array_size, masked_prod, masked_cons;
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+ int32_t error;
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+ struct pvcalls_data_intf *intf = map->ring;
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+ struct pvcalls_data *data = &map->data;
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+ unsigned long flags;
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+ int ret;
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+
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+ array_size = XEN_FLEX_RING_SIZE(map->ring_order);
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+ cons = intf->in_cons;
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+ prod = intf->in_prod;
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+ error = intf->in_error;
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+ /* read the indexes first, then deal with the data */
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+ virt_mb();
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+
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+ if (error)
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+ return;
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+
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+ size = pvcalls_queued(prod, cons, array_size);
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+ if (size >= array_size)
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+ return;
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+ spin_lock_irqsave(&map->sock->sk->sk_receive_queue.lock, flags);
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+ if (skb_queue_empty(&map->sock->sk->sk_receive_queue)) {
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+ atomic_set(&map->read, 0);
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+ spin_unlock_irqrestore(&map->sock->sk->sk_receive_queue.lock,
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+ flags);
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+ return;
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+ }
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+ spin_unlock_irqrestore(&map->sock->sk->sk_receive_queue.lock, flags);
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+ wanted = array_size - size;
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+ masked_prod = pvcalls_mask(prod, array_size);
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+ masked_cons = pvcalls_mask(cons, array_size);
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+
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+ memset(&msg, 0, sizeof(msg));
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+ msg.msg_iter.type = ITER_KVEC|WRITE;
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+ msg.msg_iter.count = wanted;
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+ if (masked_prod < masked_cons) {
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+ vec[0].iov_base = data->in + masked_prod;
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+ vec[0].iov_len = wanted;
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+ msg.msg_iter.kvec = vec;
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+ msg.msg_iter.nr_segs = 1;
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+ } else {
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+ vec[0].iov_base = data->in + masked_prod;
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+ vec[0].iov_len = array_size - masked_prod;
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+ vec[1].iov_base = data->in;
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+ vec[1].iov_len = wanted - vec[0].iov_len;
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+ msg.msg_iter.kvec = vec;
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+ msg.msg_iter.nr_segs = 2;
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+ }
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+
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+ atomic_set(&map->read, 0);
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+ ret = inet_recvmsg(map->sock, &msg, wanted, MSG_DONTWAIT);
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+ WARN_ON(ret > wanted);
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+ if (ret == -EAGAIN) /* shouldn't happen */
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+ return;
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+ if (!ret)
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+ ret = -ENOTCONN;
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+ spin_lock_irqsave(&map->sock->sk->sk_receive_queue.lock, flags);
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+ if (ret > 0 && !skb_queue_empty(&map->sock->sk->sk_receive_queue))
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+ atomic_inc(&map->read);
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+ spin_unlock_irqrestore(&map->sock->sk->sk_receive_queue.lock, flags);
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+
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+ /* write the data, then modify the indexes */
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+ virt_wmb();
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+ if (ret < 0)
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+ intf->in_error = ret;
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+ else
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+ intf->in_prod = prod + ret;
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+ /* update the indexes, then notify the other end */
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+ virt_wmb();
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+ notify_remote_via_irq(map->irq);
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+
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+ return;
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+}
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+
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+static void pvcalls_conn_back_write(struct sock_mapping *map)
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+{
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+ struct pvcalls_data_intf *intf = map->ring;
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+ struct pvcalls_data *data = &map->data;
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+ struct msghdr msg;
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+ struct kvec vec[2];
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+ RING_IDX cons, prod, size, array_size;
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+ int ret;
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+
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+ cons = intf->out_cons;
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+ prod = intf->out_prod;
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+ /* read the indexes before dealing with the data */
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+ virt_mb();
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+
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+ array_size = XEN_FLEX_RING_SIZE(map->ring_order);
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+ size = pvcalls_queued(prod, cons, array_size);
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+ if (size == 0)
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+ return;
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+
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+ memset(&msg, 0, sizeof(msg));
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+ msg.msg_flags |= MSG_DONTWAIT;
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+ msg.msg_iter.type = ITER_KVEC|READ;
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+ msg.msg_iter.count = size;
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+ if (pvcalls_mask(prod, array_size) > pvcalls_mask(cons, array_size)) {
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+ vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
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+ vec[0].iov_len = size;
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+ msg.msg_iter.kvec = vec;
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+ msg.msg_iter.nr_segs = 1;
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+ } else {
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+ vec[0].iov_base = data->out + pvcalls_mask(cons, array_size);
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+ vec[0].iov_len = array_size - pvcalls_mask(cons, array_size);
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+ vec[1].iov_base = data->out;
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+ vec[1].iov_len = size - vec[0].iov_len;
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+ msg.msg_iter.kvec = vec;
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+ msg.msg_iter.nr_segs = 2;
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+ }
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+
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+ atomic_set(&map->write, 0);
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+ ret = inet_sendmsg(map->sock, &msg, size);
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+ if (ret == -EAGAIN || (ret >= 0 && ret < size)) {
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+ atomic_inc(&map->write);
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+ atomic_inc(&map->io);
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+ }
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+ if (ret == -EAGAIN)
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+ return;
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+
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+ /* write the data, then update the indexes */
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+ virt_wmb();
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+ if (ret < 0) {
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+ intf->out_error = ret;
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+ } else {
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+ intf->out_error = 0;
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+ intf->out_cons = cons + ret;
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+ prod = intf->out_prod;
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+ }
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+ /* update the indexes, then notify the other end */
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+ virt_wmb();
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+ if (prod != cons + ret)
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+ atomic_inc(&map->write);
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+ notify_remote_via_irq(map->irq);
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+}
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+
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+static void pvcalls_back_ioworker(struct work_struct *work)
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+{
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+ struct pvcalls_ioworker *ioworker = container_of(work,
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+ struct pvcalls_ioworker, register_work);
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+ struct sock_mapping *map = container_of(ioworker, struct sock_mapping,
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+ ioworker);
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+
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+ while (atomic_read(&map->io) > 0) {
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+ if (atomic_read(&map->release) > 0) {
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+ atomic_set(&map->release, 0);
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+ return;
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+ }
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+
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+ if (atomic_read(&map->read) > 0)
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+ pvcalls_conn_back_read(map);
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+ if (atomic_read(&map->write) > 0)
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+ pvcalls_conn_back_write(map);
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+
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+ atomic_dec(&map->io);
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+ }
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+}
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+
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+static int pvcalls_back_socket(struct xenbus_device *dev,
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+ struct xen_pvcalls_request *req)
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+{
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+ struct pvcalls_fedata *fedata;
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+ int ret;
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+ struct xen_pvcalls_response *rsp;
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+
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+ fedata = dev_get_drvdata(&dev->dev);
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+
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+ if (req->u.socket.domain != AF_INET ||
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+ req->u.socket.type != SOCK_STREAM ||
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+ (req->u.socket.protocol != IPPROTO_IP &&
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+ req->u.socket.protocol != AF_INET))
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+ ret = -EAFNOSUPPORT;
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+ else
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+ ret = 0;
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+
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+ /* leave the actual socket allocation for later */
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+
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+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
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+ rsp->req_id = req->req_id;
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+ rsp->cmd = req->cmd;
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+ rsp->u.socket.id = req->u.socket.id;
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+ rsp->ret = ret;
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+
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+ return 0;
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+}
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+
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+static void pvcalls_sk_state_change(struct sock *sock)
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+{
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+ struct sock_mapping *map = sock->sk_user_data;
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+ struct pvcalls_data_intf *intf;
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+
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+ if (map == NULL)
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+ return;
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+
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+ intf = map->ring;
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+ intf->in_error = -ENOTCONN;
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+ notify_remote_via_irq(map->irq);
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+}
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+
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+static void pvcalls_sk_data_ready(struct sock *sock)
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+{
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+ struct sock_mapping *map = sock->sk_user_data;
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+ struct pvcalls_ioworker *iow;
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+
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+ if (map == NULL)
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+ return;
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+
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+ iow = &map->ioworker;
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+ atomic_inc(&map->read);
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+ atomic_inc(&map->io);
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+ queue_work(iow->wq, &iow->register_work);
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+}
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+
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+static struct sock_mapping *pvcalls_new_active_socket(
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+ struct pvcalls_fedata *fedata,
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+ uint64_t id,
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+ grant_ref_t ref,
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+ uint32_t evtchn,
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+ struct socket *sock)
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+{
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+ int ret;
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+ struct sock_mapping *map;
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+ void *page;
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+
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+ map = kzalloc(sizeof(*map), GFP_KERNEL);
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+ if (map == NULL)
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+ return NULL;
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+
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+ map->fedata = fedata;
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+ map->sock = sock;
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+ map->id = id;
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+ map->ref = ref;
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+
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+ ret = xenbus_map_ring_valloc(fedata->dev, &ref, 1, &page);
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+ if (ret < 0)
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+ goto out;
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+ map->ring = page;
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+ map->ring_order = map->ring->ring_order;
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+ /* first read the order, then map the data ring */
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+ virt_rmb();
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+ if (map->ring_order > MAX_RING_ORDER) {
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+ pr_warn("%s frontend requested ring_order %u, which is > MAX (%u)\n",
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+ __func__, map->ring_order, MAX_RING_ORDER);
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+ goto out;
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+ }
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+ ret = xenbus_map_ring_valloc(fedata->dev, map->ring->ref,
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+ (1 << map->ring_order), &page);
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+ if (ret < 0)
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+ goto out;
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+ map->bytes = page;
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+
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+ ret = bind_interdomain_evtchn_to_irqhandler(fedata->dev->otherend_id,
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+ evtchn,
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+ pvcalls_back_conn_event,
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+ 0,
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+ "pvcalls-backend",
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+ map);
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+ if (ret < 0)
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+ goto out;
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+ map->irq = ret;
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+
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+ map->data.in = map->bytes;
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+ map->data.out = map->bytes + XEN_FLEX_RING_SIZE(map->ring_order);
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+
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+ map->ioworker.wq = alloc_workqueue("pvcalls_io", WQ_UNBOUND, 1);
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+ if (!map->ioworker.wq)
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+ goto out;
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+ atomic_set(&map->io, 1);
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+ INIT_WORK(&map->ioworker.register_work, pvcalls_back_ioworker);
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+
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+ down(&fedata->socket_lock);
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+ list_add_tail(&map->list, &fedata->socket_mappings);
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+ up(&fedata->socket_lock);
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+
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+ write_lock_bh(&map->sock->sk->sk_callback_lock);
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+ map->saved_data_ready = map->sock->sk->sk_data_ready;
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+ map->sock->sk->sk_user_data = map;
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+ map->sock->sk->sk_data_ready = pvcalls_sk_data_ready;
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+ map->sock->sk->sk_state_change = pvcalls_sk_state_change;
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+ write_unlock_bh(&map->sock->sk->sk_callback_lock);
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+
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+ return map;
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+out:
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+ down(&fedata->socket_lock);
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+ list_del(&map->list);
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+ pvcalls_back_release_active(fedata->dev, fedata, map);
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+ up(&fedata->socket_lock);
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+ return NULL;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_connect(struct xenbus_device *dev,
|
|
|
+ struct xen_pvcalls_request *req)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ int ret = -EINVAL;
|
|
|
+ struct socket *sock;
|
|
|
+ struct sock_mapping *map;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+ struct sockaddr *sa = (struct sockaddr *)&req->u.connect.addr;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+
|
|
|
+ if (req->u.connect.len < sizeof(sa->sa_family) ||
|
|
|
+ req->u.connect.len > sizeof(req->u.connect.addr) ||
|
|
|
+ sa->sa_family != AF_INET)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ ret = sock_create(AF_INET, SOCK_STREAM, 0, &sock);
|
|
|
+ if (ret < 0)
|
|
|
+ goto out;
|
|
|
+ ret = inet_stream_connect(sock, sa, req->u.connect.len, 0);
|
|
|
+ if (ret < 0) {
|
|
|
+ sock_release(sock);
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ map = pvcalls_new_active_socket(fedata,
|
|
|
+ req->u.connect.id,
|
|
|
+ req->u.connect.ref,
|
|
|
+ req->u.connect.evtchn,
|
|
|
+ sock);
|
|
|
+ if (!map) {
|
|
|
+ ret = -EFAULT;
|
|
|
+ sock_release(map->sock);
|
|
|
+ }
|
|
|
+
|
|
|
+out:
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->u.connect.id = req->u.connect.id;
|
|
|
+ rsp->ret = ret;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_release_active(struct xenbus_device *dev,
|
|
|
+ struct pvcalls_fedata *fedata,
|
|
|
+ struct sock_mapping *map)
|
|
|
+{
|
|
|
+ disable_irq(map->irq);
|
|
|
+ if (map->sock->sk != NULL) {
|
|
|
+ write_lock_bh(&map->sock->sk->sk_callback_lock);
|
|
|
+ map->sock->sk->sk_user_data = NULL;
|
|
|
+ map->sock->sk->sk_data_ready = map->saved_data_ready;
|
|
|
+ write_unlock_bh(&map->sock->sk->sk_callback_lock);
|
|
|
+ }
|
|
|
+
|
|
|
+ atomic_set(&map->release, 1);
|
|
|
+ flush_work(&map->ioworker.register_work);
|
|
|
+
|
|
|
+ xenbus_unmap_ring_vfree(dev, map->bytes);
|
|
|
+ xenbus_unmap_ring_vfree(dev, (void *)map->ring);
|
|
|
+ unbind_from_irqhandler(map->irq, map);
|
|
|
+
|
|
|
+ sock_release(map->sock);
|
|
|
+ kfree(map);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_release_passive(struct xenbus_device *dev,
|
|
|
+ struct pvcalls_fedata *fedata,
|
|
|
+ struct sockpass_mapping *mappass)
|
|
|
+{
|
|
|
+ if (mappass->sock->sk != NULL) {
|
|
|
+ write_lock_bh(&mappass->sock->sk->sk_callback_lock);
|
|
|
+ mappass->sock->sk->sk_user_data = NULL;
|
|
|
+ mappass->sock->sk->sk_data_ready = mappass->saved_data_ready;
|
|
|
+ write_unlock_bh(&mappass->sock->sk->sk_callback_lock);
|
|
|
+ }
|
|
|
+ sock_release(mappass->sock);
|
|
|
+ flush_workqueue(mappass->wq);
|
|
|
+ destroy_workqueue(mappass->wq);
|
|
|
+ kfree(mappass);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_release(struct xenbus_device *dev,
|
|
|
+ struct xen_pvcalls_request *req)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ struct sock_mapping *map, *n;
|
|
|
+ struct sockpass_mapping *mappass;
|
|
|
+ int ret = 0;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+
|
|
|
+ down(&fedata->socket_lock);
|
|
|
+ list_for_each_entry_safe(map, n, &fedata->socket_mappings, list) {
|
|
|
+ if (map->id == req->u.release.id) {
|
|
|
+ list_del(&map->list);
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+ ret = pvcalls_back_release_active(dev, fedata, map);
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ mappass = radix_tree_lookup(&fedata->socketpass_mappings,
|
|
|
+ req->u.release.id);
|
|
|
+ if (mappass != NULL) {
|
|
|
+ radix_tree_delete(&fedata->socketpass_mappings, mappass->id);
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+ ret = pvcalls_back_release_passive(dev, fedata, mappass);
|
|
|
+ } else
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+
|
|
|
+out:
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->u.release.id = req->u.release.id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->ret = ret;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void __pvcalls_back_accept(struct work_struct *work)
|
|
|
+{
|
|
|
+ struct sockpass_mapping *mappass = container_of(
|
|
|
+ work, struct sockpass_mapping, register_work);
|
|
|
+ struct sock_mapping *map;
|
|
|
+ struct pvcalls_ioworker *iow;
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ struct socket *sock;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+ struct xen_pvcalls_request *req;
|
|
|
+ int notify;
|
|
|
+ int ret = -EINVAL;
|
|
|
+ unsigned long flags;
|
|
|
+
|
|
|
+ fedata = mappass->fedata;
|
|
|
+ /*
|
|
|
+ * __pvcalls_back_accept can race against pvcalls_back_accept.
|
|
|
+ * We only need to check the value of "cmd" on read. It could be
|
|
|
+ * done atomically, but to simplify the code on the write side, we
|
|
|
+ * use a spinlock.
|
|
|
+ */
|
|
|
+ spin_lock_irqsave(&mappass->copy_lock, flags);
|
|
|
+ req = &mappass->reqcopy;
|
|
|
+ if (req->cmd != PVCALLS_ACCEPT) {
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+
|
|
|
+ sock = sock_alloc();
|
|
|
+ if (sock == NULL)
|
|
|
+ goto out_error;
|
|
|
+ sock->type = mappass->sock->type;
|
|
|
+ sock->ops = mappass->sock->ops;
|
|
|
+
|
|
|
+ ret = inet_accept(mappass->sock, sock, O_NONBLOCK, true);
|
|
|
+ if (ret == -EAGAIN) {
|
|
|
+ sock_release(sock);
|
|
|
+ goto out_error;
|
|
|
+ }
|
|
|
+
|
|
|
+ map = pvcalls_new_active_socket(fedata,
|
|
|
+ req->u.accept.id_new,
|
|
|
+ req->u.accept.ref,
|
|
|
+ req->u.accept.evtchn,
|
|
|
+ sock);
|
|
|
+ if (!map) {
|
|
|
+ ret = -EFAULT;
|
|
|
+ sock_release(sock);
|
|
|
+ goto out_error;
|
|
|
+ }
|
|
|
+
|
|
|
+ map->sockpass = mappass;
|
|
|
+ iow = &map->ioworker;
|
|
|
+ atomic_inc(&map->read);
|
|
|
+ atomic_inc(&map->io);
|
|
|
+ queue_work(iow->wq, &iow->register_work);
|
|
|
+
|
|
|
+out_error:
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->u.accept.id = req->u.accept.id;
|
|
|
+ rsp->ret = ret;
|
|
|
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&fedata->ring, notify);
|
|
|
+ if (notify)
|
|
|
+ notify_remote_via_irq(fedata->irq);
|
|
|
+
|
|
|
+ mappass->reqcopy.cmd = 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void pvcalls_pass_sk_data_ready(struct sock *sock)
|
|
|
+{
|
|
|
+ struct sockpass_mapping *mappass = sock->sk_user_data;
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+ unsigned long flags;
|
|
|
+ int notify;
|
|
|
+
|
|
|
+ if (mappass == NULL)
|
|
|
+ return;
|
|
|
+
|
|
|
+ fedata = mappass->fedata;
|
|
|
+ spin_lock_irqsave(&mappass->copy_lock, flags);
|
|
|
+ if (mappass->reqcopy.cmd == PVCALLS_POLL) {
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring,
|
|
|
+ fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = mappass->reqcopy.req_id;
|
|
|
+ rsp->u.poll.id = mappass->reqcopy.u.poll.id;
|
|
|
+ rsp->cmd = mappass->reqcopy.cmd;
|
|
|
+ rsp->ret = 0;
|
|
|
+
|
|
|
+ mappass->reqcopy.cmd = 0;
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+
|
|
|
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&fedata->ring, notify);
|
|
|
+ if (notify)
|
|
|
+ notify_remote_via_irq(mappass->fedata->irq);
|
|
|
+ } else {
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+ queue_work(mappass->wq, &mappass->register_work);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_bind(struct xenbus_device *dev,
|
|
|
+ struct xen_pvcalls_request *req)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ int ret;
|
|
|
+ struct sockpass_mapping *map;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+
|
|
|
+ map = kzalloc(sizeof(*map), GFP_KERNEL);
|
|
|
+ if (map == NULL) {
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ INIT_WORK(&map->register_work, __pvcalls_back_accept);
|
|
|
+ spin_lock_init(&map->copy_lock);
|
|
|
+ map->wq = alloc_workqueue("pvcalls_wq", WQ_UNBOUND, 1);
|
|
|
+ if (!map->wq) {
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = sock_create(AF_INET, SOCK_STREAM, 0, &map->sock);
|
|
|
+ if (ret < 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ ret = inet_bind(map->sock, (struct sockaddr *)&req->u.bind.addr,
|
|
|
+ req->u.bind.len);
|
|
|
+ if (ret < 0)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ map->fedata = fedata;
|
|
|
+ map->id = req->u.bind.id;
|
|
|
+
|
|
|
+ down(&fedata->socket_lock);
|
|
|
+ ret = radix_tree_insert(&fedata->socketpass_mappings, map->id,
|
|
|
+ map);
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+ if (ret)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ write_lock_bh(&map->sock->sk->sk_callback_lock);
|
|
|
+ map->saved_data_ready = map->sock->sk->sk_data_ready;
|
|
|
+ map->sock->sk->sk_user_data = map;
|
|
|
+ map->sock->sk->sk_data_ready = pvcalls_pass_sk_data_ready;
|
|
|
+ write_unlock_bh(&map->sock->sk->sk_callback_lock);
|
|
|
+
|
|
|
+out:
|
|
|
+ if (ret) {
|
|
|
+ if (map && map->sock)
|
|
|
+ sock_release(map->sock);
|
|
|
+ if (map && map->wq)
|
|
|
+ destroy_workqueue(map->wq);
|
|
|
+ kfree(map);
|
|
|
+ }
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->u.bind.id = req->u.bind.id;
|
|
|
+ rsp->ret = ret;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_listen(struct xenbus_device *dev,
|
|
|
+ struct xen_pvcalls_request *req)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ int ret = -EINVAL;
|
|
|
+ struct sockpass_mapping *map;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+
|
|
|
+ down(&fedata->socket_lock);
|
|
|
+ map = radix_tree_lookup(&fedata->socketpass_mappings, req->u.listen.id);
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+ if (map == NULL)
|
|
|
+ goto out;
|
|
|
+
|
|
|
+ ret = inet_listen(map->sock, req->u.listen.backlog);
|
|
|
+
|
|
|
+out:
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->u.listen.id = req->u.listen.id;
|
|
|
+ rsp->ret = ret;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_accept(struct xenbus_device *dev,
|
|
|
+ struct xen_pvcalls_request *req)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ struct sockpass_mapping *mappass;
|
|
|
+ int ret = -EINVAL;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+ unsigned long flags;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+
|
|
|
+ down(&fedata->socket_lock);
|
|
|
+ mappass = radix_tree_lookup(&fedata->socketpass_mappings,
|
|
|
+ req->u.accept.id);
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+ if (mappass == NULL)
|
|
|
+ goto out_error;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Limitation of the current implementation: only support one
|
|
|
+ * concurrent accept or poll call on one socket.
|
|
|
+ */
|
|
|
+ spin_lock_irqsave(&mappass->copy_lock, flags);
|
|
|
+ if (mappass->reqcopy.cmd != 0) {
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+ ret = -EINTR;
|
|
|
+ goto out_error;
|
|
|
+ }
|
|
|
+
|
|
|
+ mappass->reqcopy = *req;
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+ queue_work(mappass->wq, &mappass->register_work);
|
|
|
+
|
|
|
+ /* Tell the caller we don't need to send back a notification yet */
|
|
|
+ return -1;
|
|
|
+
|
|
|
+out_error:
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->u.accept.id = req->u.accept.id;
|
|
|
+ rsp->ret = ret;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_poll(struct xenbus_device *dev,
|
|
|
+ struct xen_pvcalls_request *req)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ struct sockpass_mapping *mappass;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+ struct inet_connection_sock *icsk;
|
|
|
+ struct request_sock_queue *queue;
|
|
|
+ unsigned long flags;
|
|
|
+ int ret;
|
|
|
+ bool data;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+
|
|
|
+ down(&fedata->socket_lock);
|
|
|
+ mappass = radix_tree_lookup(&fedata->socketpass_mappings,
|
|
|
+ req->u.poll.id);
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+ if (mappass == NULL)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Limitation of the current implementation: only support one
|
|
|
+ * concurrent accept or poll call on one socket.
|
|
|
+ */
|
|
|
+ spin_lock_irqsave(&mappass->copy_lock, flags);
|
|
|
+ if (mappass->reqcopy.cmd != 0) {
|
|
|
+ ret = -EINTR;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+
|
|
|
+ mappass->reqcopy = *req;
|
|
|
+ icsk = inet_csk(mappass->sock->sk);
|
|
|
+ queue = &icsk->icsk_accept_queue;
|
|
|
+ data = queue->rskq_accept_head != NULL;
|
|
|
+ if (data) {
|
|
|
+ mappass->reqcopy.cmd = 0;
|
|
|
+ ret = 0;
|
|
|
+ goto out;
|
|
|
+ }
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+
|
|
|
+ /* Tell the caller we don't need to send back a notification yet */
|
|
|
+ return -1;
|
|
|
+
|
|
|
+out:
|
|
|
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
|
|
|
+
|
|
|
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->u.poll.id = req->u.poll.id;
|
|
|
+ rsp->ret = ret;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_handle_cmd(struct xenbus_device *dev,
|
|
|
+ struct xen_pvcalls_request *req)
|
|
|
+{
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ switch (req->cmd) {
|
|
|
+ case PVCALLS_SOCKET:
|
|
|
+ ret = pvcalls_back_socket(dev, req);
|
|
|
+ break;
|
|
|
+ case PVCALLS_CONNECT:
|
|
|
+ ret = pvcalls_back_connect(dev, req);
|
|
|
+ break;
|
|
|
+ case PVCALLS_RELEASE:
|
|
|
+ ret = pvcalls_back_release(dev, req);
|
|
|
+ break;
|
|
|
+ case PVCALLS_BIND:
|
|
|
+ ret = pvcalls_back_bind(dev, req);
|
|
|
+ break;
|
|
|
+ case PVCALLS_LISTEN:
|
|
|
+ ret = pvcalls_back_listen(dev, req);
|
|
|
+ break;
|
|
|
+ case PVCALLS_ACCEPT:
|
|
|
+ ret = pvcalls_back_accept(dev, req);
|
|
|
+ break;
|
|
|
+ case PVCALLS_POLL:
|
|
|
+ ret = pvcalls_back_poll(dev, req);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ {
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ struct xen_pvcalls_response *rsp;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+ rsp = RING_GET_RESPONSE(
|
|
|
+ &fedata->ring, fedata->ring.rsp_prod_pvt++);
|
|
|
+ rsp->req_id = req->req_id;
|
|
|
+ rsp->cmd = req->cmd;
|
|
|
+ rsp->ret = -ENOTSUPP;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void pvcalls_back_work(struct pvcalls_fedata *fedata)
|
|
|
+{
|
|
|
+ int notify, notify_all = 0, more = 1;
|
|
|
+ struct xen_pvcalls_request req;
|
|
|
+ struct xenbus_device *dev = fedata->dev;
|
|
|
+
|
|
|
+ while (more) {
|
|
|
+ while (RING_HAS_UNCONSUMED_REQUESTS(&fedata->ring)) {
|
|
|
+ RING_COPY_REQUEST(&fedata->ring,
|
|
|
+ fedata->ring.req_cons++,
|
|
|
+ &req);
|
|
|
+
|
|
|
+ if (!pvcalls_back_handle_cmd(dev, &req)) {
|
|
|
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(
|
|
|
+ &fedata->ring, notify);
|
|
|
+ notify_all += notify;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (notify_all) {
|
|
|
+ notify_remote_via_irq(fedata->irq);
|
|
|
+ notify_all = 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ RING_FINAL_CHECK_FOR_REQUESTS(&fedata->ring, more);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static irqreturn_t pvcalls_back_event(int irq, void *dev_id)
|
|
|
+{
|
|
|
+ struct xenbus_device *dev = dev_id;
|
|
|
+ struct pvcalls_fedata *fedata = NULL;
|
|
|
+
|
|
|
+ if (dev == NULL)
|
|
|
+ return IRQ_HANDLED;
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+ if (fedata == NULL)
|
|
|
+ return IRQ_HANDLED;
|
|
|
+
|
|
|
+ pvcalls_back_work(fedata);
|
|
|
+ return IRQ_HANDLED;
|
|
|
+}
|
|
|
+
|
|
|
+static irqreturn_t pvcalls_back_conn_event(int irq, void *sock_map)
|
|
|
+{
|
|
|
+ struct sock_mapping *map = sock_map;
|
|
|
+ struct pvcalls_ioworker *iow;
|
|
|
+
|
|
|
+ if (map == NULL || map->sock == NULL || map->sock->sk == NULL ||
|
|
|
+ map->sock->sk->sk_user_data != map)
|
|
|
+ return IRQ_HANDLED;
|
|
|
+
|
|
|
+ iow = &map->ioworker;
|
|
|
+
|
|
|
+ atomic_inc(&map->write);
|
|
|
+ atomic_inc(&map->io);
|
|
|
+ queue_work(iow->wq, &iow->register_work);
|
|
|
+
|
|
|
+ return IRQ_HANDLED;
|
|
|
+}
|
|
|
+
|
|
|
+static int backend_connect(struct xenbus_device *dev)
|
|
|
+{
|
|
|
+ int err, evtchn;
|
|
|
+ grant_ref_t ring_ref;
|
|
|
+ struct pvcalls_fedata *fedata = NULL;
|
|
|
+
|
|
|
+ fedata = kzalloc(sizeof(struct pvcalls_fedata), GFP_KERNEL);
|
|
|
+ if (!fedata)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ fedata->irq = -1;
|
|
|
+ err = xenbus_scanf(XBT_NIL, dev->otherend, "port", "%u",
|
|
|
+ &evtchn);
|
|
|
+ if (err != 1) {
|
|
|
+ err = -EINVAL;
|
|
|
+ xenbus_dev_fatal(dev, err, "reading %s/event-channel",
|
|
|
+ dev->otherend);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-ref", "%u", &ring_ref);
|
|
|
+ if (err != 1) {
|
|
|
+ err = -EINVAL;
|
|
|
+ xenbus_dev_fatal(dev, err, "reading %s/ring-ref",
|
|
|
+ dev->otherend);
|
|
|
+ goto error;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = bind_interdomain_evtchn_to_irq(dev->otherend_id, evtchn);
|
|
|
+ if (err < 0)
|
|
|
+ goto error;
|
|
|
+ fedata->irq = err;
|
|
|
+
|
|
|
+ err = request_threaded_irq(fedata->irq, NULL, pvcalls_back_event,
|
|
|
+ IRQF_ONESHOT, "pvcalls-back", dev);
|
|
|
+ if (err < 0)
|
|
|
+ goto error;
|
|
|
+
|
|
|
+ err = xenbus_map_ring_valloc(dev, &ring_ref, 1,
|
|
|
+ (void **)&fedata->sring);
|
|
|
+ if (err < 0)
|
|
|
+ goto error;
|
|
|
+
|
|
|
+ BACK_RING_INIT(&fedata->ring, fedata->sring, XEN_PAGE_SIZE * 1);
|
|
|
+ fedata->dev = dev;
|
|
|
+
|
|
|
+ INIT_LIST_HEAD(&fedata->socket_mappings);
|
|
|
+ INIT_RADIX_TREE(&fedata->socketpass_mappings, GFP_KERNEL);
|
|
|
+ sema_init(&fedata->socket_lock, 1);
|
|
|
+ dev_set_drvdata(&dev->dev, fedata);
|
|
|
+
|
|
|
+ down(&pvcalls_back_global.frontends_lock);
|
|
|
+ list_add_tail(&fedata->list, &pvcalls_back_global.frontends);
|
|
|
+ up(&pvcalls_back_global.frontends_lock);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ error:
|
|
|
+ if (fedata->irq >= 0)
|
|
|
+ unbind_from_irqhandler(fedata->irq, dev);
|
|
|
+ if (fedata->sring != NULL)
|
|
|
+ xenbus_unmap_ring_vfree(dev, fedata->sring);
|
|
|
+ kfree(fedata);
|
|
|
+ return err;
|
|
|
+}
|
|
|
+
|
|
|
+static int backend_disconnect(struct xenbus_device *dev)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata;
|
|
|
+ struct sock_mapping *map, *n;
|
|
|
+ struct sockpass_mapping *mappass;
|
|
|
+ struct radix_tree_iter iter;
|
|
|
+ void **slot;
|
|
|
+
|
|
|
+
|
|
|
+ fedata = dev_get_drvdata(&dev->dev);
|
|
|
+
|
|
|
+ down(&fedata->socket_lock);
|
|
|
+ list_for_each_entry_safe(map, n, &fedata->socket_mappings, list) {
|
|
|
+ list_del(&map->list);
|
|
|
+ pvcalls_back_release_active(dev, fedata, map);
|
|
|
+ }
|
|
|
+
|
|
|
+ radix_tree_for_each_slot(slot, &fedata->socketpass_mappings, &iter, 0) {
|
|
|
+ mappass = radix_tree_deref_slot(slot);
|
|
|
+ if (!mappass)
|
|
|
+ continue;
|
|
|
+ if (radix_tree_exception(mappass)) {
|
|
|
+ if (radix_tree_deref_retry(mappass))
|
|
|
+ slot = radix_tree_iter_retry(&iter);
|
|
|
+ } else {
|
|
|
+ radix_tree_delete(&fedata->socketpass_mappings,
|
|
|
+ mappass->id);
|
|
|
+ pvcalls_back_release_passive(dev, fedata, mappass);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ up(&fedata->socket_lock);
|
|
|
+
|
|
|
+ unbind_from_irqhandler(fedata->irq, dev);
|
|
|
+ xenbus_unmap_ring_vfree(dev, fedata->sring);
|
|
|
+
|
|
|
+ list_del(&fedata->list);
|
|
|
+ kfree(fedata);
|
|
|
+ dev_set_drvdata(&dev->dev, NULL);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_probe(struct xenbus_device *dev,
|
|
|
+ const struct xenbus_device_id *id)
|
|
|
+{
|
|
|
+ int err, abort;
|
|
|
+ struct xenbus_transaction xbt;
|
|
|
+
|
|
|
+again:
|
|
|
+ abort = 1;
|
|
|
+
|
|
|
+ err = xenbus_transaction_start(&xbt);
|
|
|
+ if (err) {
|
|
|
+ pr_warn("%s cannot create xenstore transaction\n", __func__);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = xenbus_printf(xbt, dev->nodename, "versions", "%s",
|
|
|
+ PVCALLS_VERSIONS);
|
|
|
+ if (err) {
|
|
|
+ pr_warn("%s write out 'versions' failed\n", __func__);
|
|
|
+ goto abort;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = xenbus_printf(xbt, dev->nodename, "max-page-order", "%u",
|
|
|
+ MAX_RING_ORDER);
|
|
|
+ if (err) {
|
|
|
+ pr_warn("%s write out 'max-page-order' failed\n", __func__);
|
|
|
+ goto abort;
|
|
|
+ }
|
|
|
+
|
|
|
+ err = xenbus_printf(xbt, dev->nodename, "function-calls",
|
|
|
+ XENBUS_FUNCTIONS_CALLS);
|
|
|
+ if (err) {
|
|
|
+ pr_warn("%s write out 'function-calls' failed\n", __func__);
|
|
|
+ goto abort;
|
|
|
+ }
|
|
|
+
|
|
|
+ abort = 0;
|
|
|
+abort:
|
|
|
+ err = xenbus_transaction_end(xbt, abort);
|
|
|
+ if (err) {
|
|
|
+ if (err == -EAGAIN && !abort)
|
|
|
+ goto again;
|
|
|
+ pr_warn("%s cannot complete xenstore transaction\n", __func__);
|
|
|
+ return err;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (abort)
|
|
|
+ return -EFAULT;
|
|
|
+
|
|
|
+ xenbus_switch_state(dev, XenbusStateInitWait);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void set_backend_state(struct xenbus_device *dev,
|
|
|
+ enum xenbus_state state)
|
|
|
+{
|
|
|
+ while (dev->state != state) {
|
|
|
+ switch (dev->state) {
|
|
|
+ case XenbusStateClosed:
|
|
|
+ switch (state) {
|
|
|
+ case XenbusStateInitWait:
|
|
|
+ case XenbusStateConnected:
|
|
|
+ xenbus_switch_state(dev, XenbusStateInitWait);
|
|
|
+ break;
|
|
|
+ case XenbusStateClosing:
|
|
|
+ xenbus_switch_state(dev, XenbusStateClosing);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ WARN_ON(1);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case XenbusStateInitWait:
|
|
|
+ case XenbusStateInitialised:
|
|
|
+ switch (state) {
|
|
|
+ case XenbusStateConnected:
|
|
|
+ backend_connect(dev);
|
|
|
+ xenbus_switch_state(dev, XenbusStateConnected);
|
|
|
+ break;
|
|
|
+ case XenbusStateClosing:
|
|
|
+ case XenbusStateClosed:
|
|
|
+ xenbus_switch_state(dev, XenbusStateClosing);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ WARN_ON(1);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case XenbusStateConnected:
|
|
|
+ switch (state) {
|
|
|
+ case XenbusStateInitWait:
|
|
|
+ case XenbusStateClosing:
|
|
|
+ case XenbusStateClosed:
|
|
|
+ down(&pvcalls_back_global.frontends_lock);
|
|
|
+ backend_disconnect(dev);
|
|
|
+ up(&pvcalls_back_global.frontends_lock);
|
|
|
+ xenbus_switch_state(dev, XenbusStateClosing);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ WARN_ON(1);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case XenbusStateClosing:
|
|
|
+ switch (state) {
|
|
|
+ case XenbusStateInitWait:
|
|
|
+ case XenbusStateConnected:
|
|
|
+ case XenbusStateClosed:
|
|
|
+ xenbus_switch_state(dev, XenbusStateClosed);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ WARN_ON(1);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ WARN_ON(1);
|
|
|
+ }
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void pvcalls_back_changed(struct xenbus_device *dev,
|
|
|
+ enum xenbus_state frontend_state)
|
|
|
+{
|
|
|
+ switch (frontend_state) {
|
|
|
+ case XenbusStateInitialising:
|
|
|
+ set_backend_state(dev, XenbusStateInitWait);
|
|
|
+ break;
|
|
|
+
|
|
|
+ case XenbusStateInitialised:
|
|
|
+ case XenbusStateConnected:
|
|
|
+ set_backend_state(dev, XenbusStateConnected);
|
|
|
+ break;
|
|
|
+
|
|
|
+ case XenbusStateClosing:
|
|
|
+ set_backend_state(dev, XenbusStateClosing);
|
|
|
+ break;
|
|
|
+
|
|
|
+ case XenbusStateClosed:
|
|
|
+ set_backend_state(dev, XenbusStateClosed);
|
|
|
+ if (xenbus_dev_is_online(dev))
|
|
|
+ break;
|
|
|
+ device_unregister(&dev->dev);
|
|
|
+ break;
|
|
|
+ case XenbusStateUnknown:
|
|
|
+ set_backend_state(dev, XenbusStateClosed);
|
|
|
+ device_unregister(&dev->dev);
|
|
|
+ break;
|
|
|
+
|
|
|
+ default:
|
|
|
+ xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
|
|
|
+ frontend_state);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_remove(struct xenbus_device *dev)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int pvcalls_back_uevent(struct xenbus_device *xdev,
|
|
|
+ struct kobj_uevent_env *env)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct xenbus_device_id pvcalls_back_ids[] = {
|
|
|
+ { "pvcalls" },
|
|
|
+ { "" }
|
|
|
+};
|
|
|
+
|
|
|
+static struct xenbus_driver pvcalls_back_driver = {
|
|
|
+ .ids = pvcalls_back_ids,
|
|
|
+ .probe = pvcalls_back_probe,
|
|
|
+ .remove = pvcalls_back_remove,
|
|
|
+ .uevent = pvcalls_back_uevent,
|
|
|
+ .otherend_changed = pvcalls_back_changed,
|
|
|
+};
|
|
|
+
|
|
|
+static int __init pvcalls_back_init(void)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (!xen_domain())
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ ret = xenbus_register_backend(&pvcalls_back_driver);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ sema_init(&pvcalls_back_global.frontends_lock, 1);
|
|
|
+ INIT_LIST_HEAD(&pvcalls_back_global.frontends);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+module_init(pvcalls_back_init);
|
|
|
+
|
|
|
+static void __exit pvcalls_back_fin(void)
|
|
|
+{
|
|
|
+ struct pvcalls_fedata *fedata, *nfedata;
|
|
|
+
|
|
|
+ down(&pvcalls_back_global.frontends_lock);
|
|
|
+ list_for_each_entry_safe(fedata, nfedata,
|
|
|
+ &pvcalls_back_global.frontends, list) {
|
|
|
+ backend_disconnect(fedata->dev);
|
|
|
+ }
|
|
|
+ up(&pvcalls_back_global.frontends_lock);
|
|
|
+
|
|
|
+ xenbus_unregister_driver(&pvcalls_back_driver);
|
|
|
+}
|
|
|
+
|
|
|
+module_exit(pvcalls_back_fin);
|
Linus Torvalds