571 lines
13 KiB
C
571 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/9p/trans_xen
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*
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* Xen transport layer.
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*
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* Copyright (C) 2017 by Stefano Stabellini <stefano@aporeto.com>
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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/9pfs.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#define XEN_9PFS_NUM_RINGS 2
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#define XEN_9PFS_RING_ORDER 9
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#define XEN_9PFS_RING_SIZE(ring) XEN_FLEX_RING_SIZE(ring->intf->ring_order)
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struct xen_9pfs_header {
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uint32_t size;
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uint8_t id;
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uint16_t tag;
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/* uint8_t sdata[]; */
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} __attribute__((packed));
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/* One per ring, more than one per 9pfs share */
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struct xen_9pfs_dataring {
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struct xen_9pfs_front_priv *priv;
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struct xen_9pfs_data_intf *intf;
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grant_ref_t ref;
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int evtchn;
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int irq;
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/* protect a ring from concurrent accesses */
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spinlock_t lock;
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struct xen_9pfs_data data;
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wait_queue_head_t wq;
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struct work_struct work;
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};
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/* One per 9pfs share */
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struct xen_9pfs_front_priv {
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struct list_head list;
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struct xenbus_device *dev;
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char *tag;
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struct p9_client *client;
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int num_rings;
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struct xen_9pfs_dataring *rings;
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};
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static LIST_HEAD(xen_9pfs_devs);
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static DEFINE_RWLOCK(xen_9pfs_lock);
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/* We don't currently allow canceling of requests */
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static int p9_xen_cancel(struct p9_client *client, struct p9_req_t *req)
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{
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return 1;
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}
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static int p9_xen_create(struct p9_client *client, const char *addr, char *args)
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{
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struct xen_9pfs_front_priv *priv;
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if (addr == NULL)
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return -EINVAL;
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read_lock(&xen_9pfs_lock);
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list_for_each_entry(priv, &xen_9pfs_devs, list) {
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if (!strcmp(priv->tag, addr)) {
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priv->client = client;
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read_unlock(&xen_9pfs_lock);
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return 0;
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}
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}
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read_unlock(&xen_9pfs_lock);
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return -EINVAL;
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}
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static void p9_xen_close(struct p9_client *client)
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{
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struct xen_9pfs_front_priv *priv;
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read_lock(&xen_9pfs_lock);
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list_for_each_entry(priv, &xen_9pfs_devs, list) {
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if (priv->client == client) {
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priv->client = NULL;
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read_unlock(&xen_9pfs_lock);
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return;
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}
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}
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read_unlock(&xen_9pfs_lock);
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}
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static bool p9_xen_write_todo(struct xen_9pfs_dataring *ring, RING_IDX size)
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{
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RING_IDX cons, prod;
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cons = ring->intf->out_cons;
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prod = ring->intf->out_prod;
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virt_mb();
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return XEN_9PFS_RING_SIZE(ring) -
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xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE(ring)) >= size;
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}
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static int p9_xen_request(struct p9_client *client, struct p9_req_t *p9_req)
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{
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struct xen_9pfs_front_priv *priv;
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RING_IDX cons, prod, masked_cons, masked_prod;
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unsigned long flags;
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u32 size = p9_req->tc.size;
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struct xen_9pfs_dataring *ring;
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int num;
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read_lock(&xen_9pfs_lock);
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list_for_each_entry(priv, &xen_9pfs_devs, list) {
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if (priv->client == client)
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break;
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}
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read_unlock(&xen_9pfs_lock);
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if (list_entry_is_head(priv, &xen_9pfs_devs, list))
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return -EINVAL;
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num = p9_req->tc.tag % priv->num_rings;
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ring = &priv->rings[num];
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again:
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while (wait_event_killable(ring->wq,
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p9_xen_write_todo(ring, size)) != 0)
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;
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spin_lock_irqsave(&ring->lock, flags);
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cons = ring->intf->out_cons;
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prod = ring->intf->out_prod;
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virt_mb();
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if (XEN_9PFS_RING_SIZE(ring) -
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xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE(ring)) < size) {
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spin_unlock_irqrestore(&ring->lock, flags);
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goto again;
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}
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masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE(ring));
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masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring));
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xen_9pfs_write_packet(ring->data.out, p9_req->tc.sdata, size,
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&masked_prod, masked_cons,
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XEN_9PFS_RING_SIZE(ring));
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WRITE_ONCE(p9_req->status, REQ_STATUS_SENT);
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virt_wmb(); /* write ring before updating pointer */
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prod += size;
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ring->intf->out_prod = prod;
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spin_unlock_irqrestore(&ring->lock, flags);
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notify_remote_via_irq(ring->irq);
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p9_req_put(client, p9_req);
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return 0;
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}
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static void p9_xen_response(struct work_struct *work)
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{
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struct xen_9pfs_front_priv *priv;
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struct xen_9pfs_dataring *ring;
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RING_IDX cons, prod, masked_cons, masked_prod;
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struct xen_9pfs_header h;
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struct p9_req_t *req;
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int status;
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ring = container_of(work, struct xen_9pfs_dataring, work);
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priv = ring->priv;
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while (1) {
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cons = ring->intf->in_cons;
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prod = ring->intf->in_prod;
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virt_rmb();
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if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE(ring)) <
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sizeof(h)) {
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notify_remote_via_irq(ring->irq);
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return;
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}
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masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE(ring));
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masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring));
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/* First, read just the header */
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xen_9pfs_read_packet(&h, ring->data.in, sizeof(h),
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masked_prod, &masked_cons,
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XEN_9PFS_RING_SIZE(ring));
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req = p9_tag_lookup(priv->client, h.tag);
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if (!req || req->status != REQ_STATUS_SENT) {
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dev_warn(&priv->dev->dev, "Wrong req tag=%x\n", h.tag);
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cons += h.size;
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virt_mb();
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ring->intf->in_cons = cons;
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continue;
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}
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if (h.size > req->rc.capacity) {
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dev_warn(&priv->dev->dev,
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"requested packet size too big: %d for tag %d with capacity %zd\n",
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h.size, h.tag, req->rc.capacity);
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WRITE_ONCE(req->status, REQ_STATUS_ERROR);
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goto recv_error;
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}
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memcpy(&req->rc, &h, sizeof(h));
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req->rc.offset = 0;
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masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE(ring));
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/* Then, read the whole packet (including the header) */
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xen_9pfs_read_packet(req->rc.sdata, ring->data.in, h.size,
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masked_prod, &masked_cons,
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XEN_9PFS_RING_SIZE(ring));
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recv_error:
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virt_mb();
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cons += h.size;
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ring->intf->in_cons = cons;
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status = (req->status != REQ_STATUS_ERROR) ?
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REQ_STATUS_RCVD : REQ_STATUS_ERROR;
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p9_client_cb(priv->client, req, status);
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}
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}
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static irqreturn_t xen_9pfs_front_event_handler(int irq, void *r)
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{
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struct xen_9pfs_dataring *ring = r;
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if (!ring || !ring->priv->client) {
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/* ignore spurious interrupt */
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return IRQ_HANDLED;
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}
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wake_up_interruptible(&ring->wq);
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schedule_work(&ring->work);
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return IRQ_HANDLED;
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}
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static struct p9_trans_module p9_xen_trans = {
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.name = "xen",
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.maxsize = 1 << (XEN_9PFS_RING_ORDER + XEN_PAGE_SHIFT - 2),
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.pooled_rbuffers = false,
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.def = 1,
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.create = p9_xen_create,
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.close = p9_xen_close,
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.request = p9_xen_request,
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.cancel = p9_xen_cancel,
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.owner = THIS_MODULE,
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};
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static const struct xenbus_device_id xen_9pfs_front_ids[] = {
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{ "9pfs" },
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{ "" }
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};
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static void xen_9pfs_front_free(struct xen_9pfs_front_priv *priv)
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{
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int i, j;
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write_lock(&xen_9pfs_lock);
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list_del(&priv->list);
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write_unlock(&xen_9pfs_lock);
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for (i = 0; i < priv->num_rings; i++) {
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struct xen_9pfs_dataring *ring = &priv->rings[i];
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cancel_work_sync(&ring->work);
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if (!priv->rings[i].intf)
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break;
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if (priv->rings[i].irq > 0)
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unbind_from_irqhandler(priv->rings[i].irq, priv->dev);
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if (priv->rings[i].data.in) {
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for (j = 0;
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j < (1 << priv->rings[i].intf->ring_order);
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j++) {
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grant_ref_t ref;
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ref = priv->rings[i].intf->ref[j];
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gnttab_end_foreign_access(ref, NULL);
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}
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free_pages_exact(priv->rings[i].data.in,
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1UL << (priv->rings[i].intf->ring_order +
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XEN_PAGE_SHIFT));
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}
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gnttab_end_foreign_access(priv->rings[i].ref, NULL);
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free_page((unsigned long)priv->rings[i].intf);
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}
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kfree(priv->rings);
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kfree(priv->tag);
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kfree(priv);
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}
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static int xen_9pfs_front_remove(struct xenbus_device *dev)
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{
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struct xen_9pfs_front_priv *priv = dev_get_drvdata(&dev->dev);
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dev_set_drvdata(&dev->dev, NULL);
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xen_9pfs_front_free(priv);
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return 0;
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}
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static int xen_9pfs_front_alloc_dataring(struct xenbus_device *dev,
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struct xen_9pfs_dataring *ring,
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unsigned int order)
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{
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int i = 0;
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int ret = -ENOMEM;
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void *bytes = NULL;
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init_waitqueue_head(&ring->wq);
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spin_lock_init(&ring->lock);
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INIT_WORK(&ring->work, p9_xen_response);
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ring->intf = (struct xen_9pfs_data_intf *)get_zeroed_page(GFP_KERNEL);
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if (!ring->intf)
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return ret;
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ret = gnttab_grant_foreign_access(dev->otherend_id,
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virt_to_gfn(ring->intf), 0);
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if (ret < 0)
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goto out;
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ring->ref = ret;
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bytes = alloc_pages_exact(1UL << (order + XEN_PAGE_SHIFT),
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GFP_KERNEL | __GFP_ZERO);
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if (!bytes) {
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ret = -ENOMEM;
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goto out;
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}
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for (; i < (1 << order); i++) {
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ret = gnttab_grant_foreign_access(
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dev->otherend_id, virt_to_gfn(bytes) + i, 0);
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if (ret < 0)
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goto out;
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ring->intf->ref[i] = ret;
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}
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ring->intf->ring_order = order;
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ring->data.in = bytes;
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ring->data.out = bytes + XEN_FLEX_RING_SIZE(order);
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ret = xenbus_alloc_evtchn(dev, &ring->evtchn);
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if (ret)
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goto out;
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ring->irq = bind_evtchn_to_irqhandler(ring->evtchn,
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xen_9pfs_front_event_handler,
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0, "xen_9pfs-frontend", ring);
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if (ring->irq >= 0)
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return 0;
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xenbus_free_evtchn(dev, ring->evtchn);
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ret = ring->irq;
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out:
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if (bytes) {
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for (i--; i >= 0; i--)
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gnttab_end_foreign_access(ring->intf->ref[i], NULL);
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free_pages_exact(bytes, 1UL << (order + XEN_PAGE_SHIFT));
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}
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gnttab_end_foreign_access(ring->ref, NULL);
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free_page((unsigned long)ring->intf);
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return ret;
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}
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static int xen_9pfs_front_init(struct xenbus_device *dev)
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{
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int ret, i;
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struct xenbus_transaction xbt;
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struct xen_9pfs_front_priv *priv = dev_get_drvdata(&dev->dev);
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char *versions, *v;
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unsigned int max_rings, max_ring_order, len = 0;
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versions = xenbus_read(XBT_NIL, dev->otherend, "versions", &len);
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if (IS_ERR(versions))
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return PTR_ERR(versions);
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for (v = versions; *v; v++) {
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if (simple_strtoul(v, &v, 10) == 1) {
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v = NULL;
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break;
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}
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}
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if (v) {
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kfree(versions);
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return -EINVAL;
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}
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kfree(versions);
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max_rings = xenbus_read_unsigned(dev->otherend, "max-rings", 0);
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if (max_rings < XEN_9PFS_NUM_RINGS)
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return -EINVAL;
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max_ring_order = xenbus_read_unsigned(dev->otherend,
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"max-ring-page-order", 0);
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if (max_ring_order > XEN_9PFS_RING_ORDER)
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max_ring_order = XEN_9PFS_RING_ORDER;
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if (p9_xen_trans.maxsize > XEN_FLEX_RING_SIZE(max_ring_order))
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p9_xen_trans.maxsize = XEN_FLEX_RING_SIZE(max_ring_order) / 2;
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priv->num_rings = XEN_9PFS_NUM_RINGS;
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priv->rings = kcalloc(priv->num_rings, sizeof(*priv->rings),
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GFP_KERNEL);
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if (!priv->rings) {
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kfree(priv);
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return -ENOMEM;
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}
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||
|
for (i = 0; i < priv->num_rings; i++) {
|
||
|
priv->rings[i].priv = priv;
|
||
|
ret = xen_9pfs_front_alloc_dataring(dev, &priv->rings[i],
|
||
|
max_ring_order);
|
||
|
if (ret < 0)
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
again:
|
||
|
ret = xenbus_transaction_start(&xbt);
|
||
|
if (ret) {
|
||
|
xenbus_dev_fatal(dev, ret, "starting transaction");
|
||
|
goto error;
|
||
|
}
|
||
|
ret = xenbus_printf(xbt, dev->nodename, "version", "%u", 1);
|
||
|
if (ret)
|
||
|
goto error_xenbus;
|
||
|
ret = xenbus_printf(xbt, dev->nodename, "num-rings", "%u",
|
||
|
priv->num_rings);
|
||
|
if (ret)
|
||
|
goto error_xenbus;
|
||
|
for (i = 0; i < priv->num_rings; i++) {
|
||
|
char str[16];
|
||
|
|
||
|
BUILD_BUG_ON(XEN_9PFS_NUM_RINGS > 9);
|
||
|
sprintf(str, "ring-ref%d", i);
|
||
|
ret = xenbus_printf(xbt, dev->nodename, str, "%d",
|
||
|
priv->rings[i].ref);
|
||
|
if (ret)
|
||
|
goto error_xenbus;
|
||
|
|
||
|
sprintf(str, "event-channel-%d", i);
|
||
|
ret = xenbus_printf(xbt, dev->nodename, str, "%u",
|
||
|
priv->rings[i].evtchn);
|
||
|
if (ret)
|
||
|
goto error_xenbus;
|
||
|
}
|
||
|
priv->tag = xenbus_read(xbt, dev->nodename, "tag", NULL);
|
||
|
if (IS_ERR(priv->tag)) {
|
||
|
ret = PTR_ERR(priv->tag);
|
||
|
goto error_xenbus;
|
||
|
}
|
||
|
ret = xenbus_transaction_end(xbt, 0);
|
||
|
if (ret) {
|
||
|
if (ret == -EAGAIN)
|
||
|
goto again;
|
||
|
xenbus_dev_fatal(dev, ret, "completing transaction");
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
error_xenbus:
|
||
|
xenbus_transaction_end(xbt, 1);
|
||
|
xenbus_dev_fatal(dev, ret, "writing xenstore");
|
||
|
error:
|
||
|
xen_9pfs_front_free(priv);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int xen_9pfs_front_probe(struct xenbus_device *dev,
|
||
|
const struct xenbus_device_id *id)
|
||
|
{
|
||
|
struct xen_9pfs_front_priv *priv = NULL;
|
||
|
|
||
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
||
|
if (!priv)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
priv->dev = dev;
|
||
|
dev_set_drvdata(&dev->dev, priv);
|
||
|
|
||
|
write_lock(&xen_9pfs_lock);
|
||
|
list_add_tail(&priv->list, &xen_9pfs_devs);
|
||
|
write_unlock(&xen_9pfs_lock);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int xen_9pfs_front_resume(struct xenbus_device *dev)
|
||
|
{
|
||
|
dev_warn(&dev->dev, "suspend/resume unsupported\n");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void xen_9pfs_front_changed(struct xenbus_device *dev,
|
||
|
enum xenbus_state backend_state)
|
||
|
{
|
||
|
switch (backend_state) {
|
||
|
case XenbusStateReconfiguring:
|
||
|
case XenbusStateReconfigured:
|
||
|
case XenbusStateInitialising:
|
||
|
case XenbusStateInitialised:
|
||
|
case XenbusStateUnknown:
|
||
|
break;
|
||
|
|
||
|
case XenbusStateInitWait:
|
||
|
if (!xen_9pfs_front_init(dev))
|
||
|
xenbus_switch_state(dev, XenbusStateInitialised);
|
||
|
break;
|
||
|
|
||
|
case XenbusStateConnected:
|
||
|
xenbus_switch_state(dev, XenbusStateConnected);
|
||
|
break;
|
||
|
|
||
|
case XenbusStateClosed:
|
||
|
if (dev->state == XenbusStateClosed)
|
||
|
break;
|
||
|
fallthrough; /* Missed the backend's CLOSING state */
|
||
|
case XenbusStateClosing:
|
||
|
xenbus_frontend_closed(dev);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static struct xenbus_driver xen_9pfs_front_driver = {
|
||
|
.ids = xen_9pfs_front_ids,
|
||
|
.probe = xen_9pfs_front_probe,
|
||
|
.remove = xen_9pfs_front_remove,
|
||
|
.resume = xen_9pfs_front_resume,
|
||
|
.otherend_changed = xen_9pfs_front_changed,
|
||
|
};
|
||
|
|
||
|
static int __init p9_trans_xen_init(void)
|
||
|
{
|
||
|
int rc;
|
||
|
|
||
|
if (!xen_domain())
|
||
|
return -ENODEV;
|
||
|
|
||
|
pr_info("Initialising Xen transport for 9pfs\n");
|
||
|
|
||
|
v9fs_register_trans(&p9_xen_trans);
|
||
|
rc = xenbus_register_frontend(&xen_9pfs_front_driver);
|
||
|
if (rc)
|
||
|
v9fs_unregister_trans(&p9_xen_trans);
|
||
|
|
||
|
return rc;
|
||
|
}
|
||
|
module_init(p9_trans_xen_init);
|
||
|
MODULE_ALIAS_9P("xen");
|
||
|
|
||
|
static void __exit p9_trans_xen_exit(void)
|
||
|
{
|
||
|
v9fs_unregister_trans(&p9_xen_trans);
|
||
|
return xenbus_unregister_driver(&xen_9pfs_front_driver);
|
||
|
}
|
||
|
module_exit(p9_trans_xen_exit);
|
||
|
|
||
|
MODULE_ALIAS("xen:9pfs");
|
||
|
MODULE_AUTHOR("Stefano Stabellini <stefano@aporeto.com>");
|
||
|
MODULE_DESCRIPTION("Xen Transport for 9P");
|
||
|
MODULE_LICENSE("GPL");
|