9p: block-based virtio client
This replaces the console-based virto client with a block-based client using a single request queue. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Eric Van Hensbergen
Eric Van Hensbergen
parent
043aba403e
commit
e2735b7720
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@ -40,7 +40,7 @@ struct p9_trans {
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void (*close) (struct p9_trans *);
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unsigned int (*poll)(struct p9_trans *, struct poll_table_struct *);
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int (*rpc) (struct p9_trans *t, struct p9_fcall *tc,
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struct p9_fcall **rc);
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struct p9_fcall **rc, int msize, int dotu);
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};
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struct p9_trans_module {
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@ -51,7 +51,7 @@ p9_client_rpc(struct p9_client *c, struct p9_fcall *tc,
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struct p9_fcall **rc)
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{
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if (c->trans->rpc)
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return c->trans->rpc(c->trans, tc, rc);
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return c->trans->rpc(c->trans, tc, rc, c->msize, c->dotu);
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else
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return p9_conn_rpc(c->conn, tc, rc);
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}
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@ -99,7 +99,7 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize,
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -191,7 +191,7 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -236,7 +236,7 @@ struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname,
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -287,7 +287,7 @@ struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err) {
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if (rc && rc->id == P9_RWALK)
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goto clunk_fid;
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@ -322,7 +322,7 @@ clunk_fid:
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goto error;
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}
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p9_client_rpc(clnt->conn, tc, &rc);
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p9_client_rpc(clnt, tc, &rc);
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error:
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kfree(tc);
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@ -356,7 +356,7 @@ int p9_client_open(struct p9_fid *fid, int mode)
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goto done;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto done;
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@ -395,7 +395,7 @@ int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
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goto done;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto done;
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@ -428,7 +428,7 @@ int p9_client_clunk(struct p9_fid *fid)
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goto done;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto done;
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@ -460,7 +460,7 @@ int p9_client_remove(struct p9_fid *fid)
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goto done;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto done;
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@ -502,7 +502,7 @@ int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count)
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -559,7 +559,7 @@ int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count)
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -613,7 +613,7 @@ p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count)
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -677,7 +677,7 @@ p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset,
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -748,7 +748,7 @@ struct p9_stat *p9_client_stat(struct p9_fid *fid)
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -790,7 +790,7 @@ int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
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goto done;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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done:
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kfree(tc);
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@ -847,7 +847,7 @@ struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset)
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goto error;
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}
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err = p9_client_rpc(clnt->conn, tc, &rc);
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err = p9_client_rpc(clnt, tc, &rc);
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if (err)
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goto error;
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@ -1,17 +1,8 @@
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/*
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* The Guest 9p transport driver
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*
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* This is a trivial pipe-based transport driver based on the lguest console
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* code: we use lguest's DMA mechanism to send bytes out, and register a
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* DMA buffer to receive bytes in. It is assumed to be present and available
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* from the very beginning of boot.
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*
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* This may be have been done by just instaniating another HVC console,
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* but HVC's blocksize of 16 bytes is annoying and painful to performance.
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*
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* A more efficient transport could be built based on the virtio block driver
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* but it requires some changes in the 9p transport model (which are in
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* progress)
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* This is a block based transport driver based on the lguest block driver
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* code.
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*
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*/
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/*
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@ -55,11 +46,25 @@
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#include <linux/virtio.h>
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#include <linux/virtio_9p.h>
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#define VIRTQUEUE_NUM 128
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/* a single mutex to manage channel initialization and attachment */
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static DECLARE_MUTEX(virtio_9p_lock);
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/* global which tracks highest initialized channel */
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static int chan_index;
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#define P9_INIT_MAXTAG 16
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#define REQ_STATUS_IDLE 0
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#define REQ_STATUS_SENT 1
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#define REQ_STATUS_RCVD 2
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#define REQ_STATUS_FLSH 3
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struct p9_req_t {
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int status;
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wait_queue_head_t *wq;
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};
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/* We keep all per-channel information in a structure.
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* This structure is allocated within the devices dev->mem space.
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* A pointer to the structure will get put in the transport private.
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@ -68,16 +73,57 @@ static struct virtio_chan {
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bool initialized; /* channel is initialized */
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bool inuse; /* channel is in use */
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struct virtqueue *in_vq, *out_vq;
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spinlock_t lock;
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struct virtio_device *vdev;
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struct virtqueue *vq;
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/* This is our input buffer, and how much data is left in it. */
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unsigned int in_len;
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char *in, *inbuf;
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struct p9_idpool *tagpool;
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struct p9_req_t *reqs;
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int max_tag;
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wait_queue_head_t wq; /* waitq for buffer */
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/* Scatterlist: can be too big for stack. */
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struct scatterlist sg[VIRTQUEUE_NUM];
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} channels[MAX_9P_CHAN];
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/* Lookup requests by tag */
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static struct p9_req_t *p9_lookup_tag(struct virtio_chan *c, u16 tag)
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{
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/* This looks up the original request by tag so we know which
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* buffer to read the data into */
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tag++;
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while (tag >= c->max_tag) {
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int old_max = c->max_tag;
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int count;
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if (c->max_tag)
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c->max_tag *= 2;
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else
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c->max_tag = P9_INIT_MAXTAG;
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c->reqs = krealloc(c->reqs, sizeof(struct p9_req_t)*c->max_tag,
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GFP_ATOMIC);
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if (!c->reqs) {
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printk(KERN_ERR "Couldn't grow tag array\n");
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BUG();
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}
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for (count = old_max; count < c->max_tag; count++) {
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c->reqs[count].status = REQ_STATUS_IDLE;
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c->reqs[count].wq = kmalloc(sizeof(wait_queue_t),
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GFP_ATOMIC);
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if (!c->reqs[count].wq) {
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printk(KERN_ERR "Couldn't grow tag array\n");
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BUG();
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}
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init_waitqueue_head(c->reqs[count].wq);
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}
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}
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return &c->reqs[tag];
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}
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/* How many bytes left in this page. */
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static unsigned int rest_of_page(void *data)
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{
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@ -86,85 +132,16 @@ static unsigned int rest_of_page(void *data)
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static int p9_virtio_write(struct p9_trans *trans, void *buf, int count)
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{
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struct virtio_chan *chan = (struct virtio_chan *) trans->priv;
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struct virtqueue *out_vq = chan->out_vq;
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struct scatterlist sg[1];
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unsigned int len;
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P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio write (%d)\n", count);
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/* keep it simple - make sure we don't overflow a page */
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if (rest_of_page(buf) < count)
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count = rest_of_page(buf);
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sg_init_one(sg, buf, count);
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/* add_buf wants a token to identify this buffer: we hand it any
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* non-NULL pointer, since there's only ever one buffer. */
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if (out_vq->vq_ops->add_buf(out_vq, sg, 1, 0, (void *)1) == 0) {
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/* Tell Host to go! */
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out_vq->vq_ops->kick(out_vq);
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/* Chill out until it's done with the buffer. */
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while (!out_vq->vq_ops->get_buf(out_vq, &len))
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cpu_relax();
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}
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P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio wrote (%d)\n", count);
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/* We're expected to return the amount of data we wrote: all of it. */
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/* Only use the rpc mechanism for now */
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return count;
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}
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/* Create a scatter-gather list representing our input buffer and put it in the
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* queue. */
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static void add_inbuf(struct virtio_chan *chan)
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{
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struct scatterlist sg[1];
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sg_init_one(sg, chan->inbuf, PAGE_SIZE);
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/* We should always be able to add one buffer to an empty queue. */
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if (chan->in_vq->vq_ops->add_buf(chan->in_vq, sg, 0, 1, chan->inbuf))
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BUG();
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chan->in_vq->vq_ops->kick(chan->in_vq);
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}
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static int p9_virtio_read(struct p9_trans *trans, void *buf, int count)
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{
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struct virtio_chan *chan = (struct virtio_chan *) trans->priv;
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struct virtqueue *in_vq = chan->in_vq;
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P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio read (%d)\n", count);
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/* If we don't have an input queue yet, we can't get input. */
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BUG_ON(!in_vq);
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/* No buffer? Try to get one. */
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if (!chan->in_len) {
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chan->in = in_vq->vq_ops->get_buf(in_vq, &chan->in_len);
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if (!chan->in)
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/* Only use the rpc mechanism for now */
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return 0;
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}
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/* You want more than we have to give? Well, try wanting less! */
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if (chan->in_len < count)
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count = chan->in_len;
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/* Copy across to their buffer and increment offset. */
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memcpy(buf, chan->in, count);
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chan->in += count;
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chan->in_len -= count;
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/* Finished? Re-register buffer so Host will use it again. */
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if (chan->in_len == 0)
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add_inbuf(chan);
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P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio finished read (%d)\n",
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count);
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return count;
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}
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/* The poll function is used by 9p transports to determine if there
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* is there is activity available on a particular channel. In our case
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* we use it to wait for a callback from the input routines.
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@ -172,25 +149,23 @@ static int p9_virtio_read(struct p9_trans *trans, void *buf, int count)
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static unsigned int
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p9_virtio_poll(struct p9_trans *trans, struct poll_table_struct *pt)
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{
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struct virtio_chan *chan = (struct virtio_chan *)trans->priv;
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struct virtqueue *in_vq = chan->in_vq;
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int ret = POLLOUT; /* we can always handle more output */
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poll_wait(NULL, &chan->wq, pt);
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/* No buffer? Try to get one. */
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if (!chan->in_len)
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chan->in = in_vq->vq_ops->get_buf(in_vq, &chan->in_len);
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if (chan->in_len)
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ret |= POLLIN;
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return ret;
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/* Only use the rpc mechanism for now */
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return 0;
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}
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static void p9_virtio_close(struct p9_trans *trans)
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{
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struct virtio_chan *chan = trans->priv;
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int count;
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unsigned int flags;
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spin_lock_irqsave(&chan->lock, flags);
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p9_idpool_destroy(chan->tagpool);
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for (count = 0; count < chan->max_tag; count++)
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kfree(chan->reqs[count].wq);
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kfree(chan->reqs);
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chan->max_tag = 0;
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spin_unlock_irqrestore(&chan->lock, flags);
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down(&virtio_9p_lock);
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chan->inuse = false;
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@ -199,15 +174,121 @@ static void p9_virtio_close(struct p9_trans *trans)
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kfree(trans);
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}
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static void p9_virtio_intr(struct virtqueue *q)
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static void req_done(struct virtqueue *vq)
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{
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struct virtio_chan *chan = q->vdev->priv;
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struct virtio_chan *chan = vq->vdev->priv;
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struct p9_fcall *rc;
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unsigned int len;
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unsigned long flags;
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struct p9_req_t *req;
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P9_DPRINTK(P9_DEBUG_TRANS, "9p poll_wakeup: %p\n", &chan->wq);
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wake_up_interruptible(&chan->wq);
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spin_lock_irqsave(&chan->lock, flags);
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while ((rc = chan->vq->vq_ops->get_buf(chan->vq, &len)) != NULL) {
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req = p9_lookup_tag(chan, rc->tag);
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req->status = REQ_STATUS_RCVD;
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wake_up(req->wq);
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}
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/* In case queue is stopped waiting for more buffers. */
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spin_unlock_irqrestore(&chan->lock, flags);
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}
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static int p9_virtio_probe(struct virtio_device *dev)
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static int
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pack_sg_list(struct scatterlist *sg, int start, int limit, char *data,
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int count)
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{
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int s;
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int index = start;
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while (count) {
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s = rest_of_page(data);
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if (s > count)
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s = count;
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sg_set_buf(&sg[index++], data, s);
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count -= s;
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data += s;
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if (index > limit)
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BUG();
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}
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return index-start;
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}
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|
||||
static int
|
||||
p9_virtio_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc,
|
||||
int msize, int dotu)
|
||||
{
|
||||
int in, out;
|
||||
int n, err, size;
|
||||
struct virtio_chan *chan = t->priv;
|
||||
char *rdata;
|
||||
struct p9_req_t *req;
|
||||
unsigned long flags;
|
||||
|
||||
if (*rc == NULL) {
|
||||
*rc = kmalloc(sizeof(struct p9_fcall) + msize, GFP_KERNEL);
|
||||
if (!*rc)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
rdata = (char *)*rc+sizeof(struct p9_fcall);
|
||||
|
||||
spin_lock_irqsave(&chan->lock, flags);
|
||||
n = P9_NOTAG;
|
||||
if (tc->id != P9_TVERSION) {
|
||||
n = p9_idpool_get(chan->tagpool);
|
||||
if (n < 0)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
req = p9_lookup_tag(chan, n);
|
||||
spin_unlock_irqrestore(&chan->lock, flags);
|
||||
|
||||
p9_set_tag(tc, n);
|
||||
|
||||
P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio rpc tag %d\n", n);
|
||||
|
||||
out = pack_sg_list(chan->sg, 0, VIRTQUEUE_NUM, tc->sdata, tc->size);
|
||||
in = pack_sg_list(chan->sg, out, VIRTQUEUE_NUM-out, rdata, msize);
|
||||
|
||||
req->status = REQ_STATUS_SENT;
|
||||
|
||||
if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, tc)) {
|
||||
P9_DPRINTK(P9_DEBUG_TRANS,
|
||||
"9p debug: virtio rpc add_buf returned failure");
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
chan->vq->vq_ops->kick(chan->vq);
|
||||
|
||||
wait_event(*req->wq, req->status == REQ_STATUS_RCVD);
|
||||
|
||||
size = le32_to_cpu(*(__le32 *) rdata);
|
||||
|
||||
err = p9_deserialize_fcall(rdata, size, *rc, dotu);
|
||||
if (err < 0) {
|
||||
P9_DPRINTK(P9_DEBUG_TRANS,
|
||||
"9p debug: virtio rpc deserialize returned %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NET_9P_DEBUG
|
||||
if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
|
||||
char buf[150];
|
||||
|
||||
p9_printfcall(buf, sizeof(buf), *rc, dotu);
|
||||
printk(KERN_NOTICE ">>> %p %s\n", t, buf);
|
||||
}
|
||||
#endif
|
||||
|
||||
if (n != P9_NOTAG && p9_idpool_check(n, chan->tagpool))
|
||||
p9_idpool_put(n, chan->tagpool);
|
||||
|
||||
req->status = REQ_STATUS_IDLE;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int p9_virtio_probe(struct virtio_device *vdev)
|
||||
{
|
||||
int err;
|
||||
struct virtio_chan *chan;
|
||||
|
|
@ -221,44 +302,29 @@ static int p9_virtio_probe(struct virtio_device *dev)
|
|||
if (chan_index > MAX_9P_CHAN) {
|
||||
printk(KERN_ERR "9p: virtio: Maximum channels exceeded\n");
|
||||
BUG();
|
||||
}
|
||||
|
||||
chan->vdev = dev;
|
||||
|
||||
/* This is the scratch page we use to receive console input */
|
||||
chan->inbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
||||
if (!chan->inbuf) {
|
||||
err = -ENOMEM;
|
||||
goto fail;
|
||||
}
|
||||
|
||||
/* Find the input queue. */
|
||||
dev->priv = chan;
|
||||
chan->in_vq = dev->config->find_vq(dev, 0, p9_virtio_intr);
|
||||
if (IS_ERR(chan->in_vq)) {
|
||||
err = PTR_ERR(chan->in_vq);
|
||||
goto free;
|
||||
chan->vdev = vdev;
|
||||
|
||||
/* We expect one virtqueue, for requests. */
|
||||
chan->vq = vdev->config->find_vq(vdev, 0, req_done);
|
||||
if (IS_ERR(chan->vq)) {
|
||||
err = PTR_ERR(chan->vq);
|
||||
goto out_free_vq;
|
||||
}
|
||||
chan->vq->vdev->priv = chan;
|
||||
spin_lock_init(&chan->lock);
|
||||
|
||||
chan->out_vq = dev->config->find_vq(dev, 1, NULL);
|
||||
if (IS_ERR(chan->out_vq)) {
|
||||
err = PTR_ERR(chan->out_vq);
|
||||
goto free_in_vq;
|
||||
}
|
||||
sg_init_table(chan->sg, VIRTQUEUE_NUM);
|
||||
|
||||
init_waitqueue_head(&chan->wq);
|
||||
|
||||
/* Register the input buffer the first time. */
|
||||
add_inbuf(chan);
|
||||
chan->inuse = false;
|
||||
chan->initialized = true;
|
||||
|
||||
return 0;
|
||||
|
||||
free_in_vq:
|
||||
dev->config->del_vq(chan->in_vq);
|
||||
free:
|
||||
kfree(chan->inbuf);
|
||||
out_free_vq:
|
||||
vdev->config->del_vq(chan->vq);
|
||||
fail:
|
||||
down(&virtio_9p_lock);
|
||||
chan_index--;
|
||||
|
|
@ -274,8 +340,8 @@ fail:
|
|||
static struct p9_trans *p9_virtio_create(const char *devname, char *args)
|
||||
{
|
||||
struct p9_trans *trans;
|
||||
int index = 0;
|
||||
struct virtio_chan *chan = channels;
|
||||
int index = 0;
|
||||
|
||||
down(&virtio_9p_lock);
|
||||
while (index < MAX_9P_CHAN) {
|
||||
|
|
@ -290,10 +356,19 @@ static struct p9_trans *p9_virtio_create(const char *devname, char *args)
|
|||
up(&virtio_9p_lock);
|
||||
|
||||
if (index >= MAX_9P_CHAN) {
|
||||
printk(KERN_ERR "9p: virtio: couldn't find a free channel\n");
|
||||
return NULL;
|
||||
printk(KERN_ERR "9p: no channels available\n");
|
||||
return ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
chan->tagpool = p9_idpool_create();
|
||||
if (IS_ERR(chan->tagpool)) {
|
||||
printk(KERN_ERR "9p: couldn't allocate tagpool\n");
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
p9_idpool_get(chan->tagpool); /* reserve tag 0 */
|
||||
chan->max_tag = 0;
|
||||
chan->reqs = NULL;
|
||||
|
||||
trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
|
||||
if (!trans) {
|
||||
printk(KERN_ERR "9p: couldn't allocate transport\n");
|
||||
|
|
@ -304,6 +379,7 @@ static struct p9_trans *p9_virtio_create(const char *devname, char *args)
|
|||
trans->read = p9_virtio_read;
|
||||
trans->close = p9_virtio_close;
|
||||
trans->poll = p9_virtio_poll;
|
||||
trans->rpc = p9_virtio_rpc;
|
||||
trans->priv = chan;
|
||||
|
||||
return trans;
|
||||
|
|
@ -327,7 +403,7 @@ static struct virtio_driver p9_virtio_drv = {
|
|||
static struct p9_trans_module p9_virtio_trans = {
|
||||
.name = "virtio",
|
||||
.create = p9_virtio_create,
|
||||
.maxsize = PAGE_SIZE,
|
||||
.maxsize = PAGE_SIZE*16,
|
||||
.def = 0,
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue