virtio: rename virtqueue_add_buf_gfp to virtqueue_add_buf

Remove wrapper functions. This makes the allocation type explicit in
all callers; I used GPF_KERNEL where it seemed obvious, left it at
GFP_ATOMIC otherwise.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reviewed-by: Christoph Hellwig <hch@lst.de>

10 files changed, 44 insertions, 58 deletions

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 4d0b70adf5f7..a345e40e1bca 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -172,7 +172,7 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
                 }
         }
 
-        if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr) < 0) {
+        if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr, GFP_ATOMIC)<0) {
                 mempool_free(vbr, vblk->pool);
                 return false;
         }
diff --git a/drivers/char/hw_random/virtio-rng.c b/drivers/char/hw_random/virtio-rng.c
index fd699ccecf5b..723725bbb96b 100644
--- a/drivers/char/hw_random/virtio-rng.c
+++ b/drivers/char/hw_random/virtio-rng.c
@@ -47,7 +47,7 @@ static void register_buffer(u8 *buf, size_t size)
         sg_init_one(&sg, buf, size);
 
         /* There should always be room for one buffer. */
-        if (virtqueue_add_buf(vq, &sg, 0, 1, buf) < 0)
+        if (virtqueue_add_buf(vq, &sg, 0, 1, buf, GFP_KERNEL) < 0)
                 BUG();
 
         virtqueue_kick(vq);
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 8e3c46d67cb3..d1ae1492ee78 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -392,7 +392,7 @@ static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
 
         sg_init_one(sg, buf->buf, buf->size);
 
-        ret = virtqueue_add_buf(vq, sg, 0, 1, buf);
+        ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC);
         virtqueue_kick(vq);
         return ret;
 }
@@ -457,7 +457,7 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
         vq = portdev->c_ovq;
 
         sg_init_one(sg, &cpkt, sizeof(cpkt));
-        if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) {
+        if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) >= 0) {
                 virtqueue_kick(vq);
                 while (!virtqueue_get_buf(vq, &len))
                         cpu_relax();
@@ -506,7 +506,7 @@ static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count,
         reclaim_consumed_buffers(port);
 
         sg_init_one(sg, in_buf, in_count);
-        ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf);
+        ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf, GFP_ATOMIC);
 
         /* Tell Host to go! */
         virtqueue_kick(out_vq);
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 76fe14efb2b5..6345a52194f9 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -370,7 +370,7 @@ static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
 
         skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
 
-        err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
+        err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
         if (err < 0)
                 dev_kfree_skb(skb);
 
@@ -415,8 +415,8 @@ static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
 
         /* chain first in list head */
         first->private = (unsigned long)list;
-        err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
-                                    first, gfp);
+        err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
+                                first, gfp);
         if (err < 0)
                 give_pages(vi, first);
 
@@ -434,7 +434,7 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
 
         sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
 
-        err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
+        err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
         if (err < 0)
                 give_pages(vi, page);
 
@@ -609,7 +609,7 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
 
         hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
         return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
-                                        0, skb);
+                                 0, skb, GFP_ATOMIC);
 }
 
 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
@@ -767,7 +767,7 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
                 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
         sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
 
-        BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi) < 0);
+        BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
 
         virtqueue_kick(vi->cvq);
 
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index f64ff185b8b5..0a6425aadf95 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -88,7 +88,7 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
         init_completion(&vb->acked);
 
         /* We should always be able to add one buffer to an empty queue. */
-        if (virtqueue_add_buf(vq, &sg, 1, 0, vb) < 0)
+        if (virtqueue_add_buf(vq, &sg, 1, 0, vb, GFP_KERNEL) < 0)
                 BUG();
         virtqueue_kick(vq);
 
@@ -220,7 +220,7 @@ static void stats_handle_request(struct virtio_balloon *vb)
 
         vq = vb->stats_vq;
         sg_init_one(&sg, vb->stats, sizeof(vb->stats));
-        if (virtqueue_add_buf(vq, &sg, 1, 0, vb) < 0)
+        if (virtqueue_add_buf(vq, &sg, 1, 0, vb, GFP_KERNEL) < 0)
                 BUG();
         virtqueue_kick(vq);
 }
@@ -313,7 +313,8 @@ static int virtballoon_probe(struct virtio_device *vdev)
                  * use it to signal us later.
                  */
                 sg_init_one(&sg, vb->stats, sizeof vb->stats);
-                if (virtqueue_add_buf(vb->stats_vq, &sg, 1, 0, vb) < 0)
+                if (virtqueue_add_buf(vb->stats_vq, &sg, 1, 0, vb, GFP_KERNEL)
+                    < 0)
                         BUG();
                 virtqueue_kick(vb->stats_vq);
         }
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index fe50486341a4..6ea92a6d1134 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -167,7 +167,7 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
 }
 
 /**
- * virtqueue_add_buf_gfp - expose buffer to other end
+ * virtqueue_add_buf - expose buffer to other end
  * @vq: the struct virtqueue we're talking about.
  * @sg: the description of the buffer(s).
  * @out_num: the number of sg readable by other side
@@ -183,12 +183,12 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
  * positive return values as "available": indirect buffers mean that
  * we can put an entire sg[] array inside a single queue entry.
  */
-int virtqueue_add_buf_gfp(struct virtqueue *_vq,
-                          struct scatterlist sg[],
-                          unsigned int out,
-                          unsigned int in,
-                          void *data,
-                          gfp_t gfp)
+int virtqueue_add_buf(struct virtqueue *_vq,
+                      struct scatterlist sg[],
+                      unsigned int out,
+                      unsigned int in,
+                      void *data,
+                      gfp_t gfp)
 {
         struct vring_virtqueue *vq = to_vvq(_vq);
         unsigned int i, avail, uninitialized_var(prev);
@@ -259,13 +259,13 @@ add_head:
 
         return vq->num_free;
 }
-EXPORT_SYMBOL_GPL(virtqueue_add_buf_gfp);
+EXPORT_SYMBOL_GPL(virtqueue_add_buf);
 
 /**
  * virtqueue_kick - update after add_buf
  * @vq: the struct virtqueue
  *
- * After one or more virtqueue_add_buf_gfp calls, invoke this to kick
+ * After one or more virtqueue_add_buf calls, invoke this to kick
  * the other side.
  *
  * Caller must ensure we don't call this with other virtqueue
@@ -341,7 +341,7 @@ static inline bool more_used(const struct vring_virtqueue *vq)
  * operations at the same time (except where noted).
  *
  * Returns NULL if there are no used buffers, or the "data" token
- * handed to virtqueue_add_buf_gfp().
+ * handed to virtqueue_add_buf().
  */
 void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len)
 {
@@ -490,7 +490,7 @@ EXPORT_SYMBOL_GPL(virtqueue_enable_cb_delayed);
  * virtqueue_detach_unused_buf - detach first unused buffer
  * @vq: the struct virtqueue we're talking about.
  *
- * Returns NULL or the "data" token handed to virtqueue_add_buf_gfp().
+ * Returns NULL or the "data" token handed to virtqueue_add_buf().
  * This is not valid on an active queue; it is useful only for device
  * shutdown.
  */
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 73ad7243128f..ec1706e7df50 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -25,21 +25,12 @@ struct virtqueue {
         void *priv;
 };
 
-int virtqueue_add_buf_gfp(struct virtqueue *vq,
-                          struct scatterlist sg[],
-                          unsigned int out_num,
-                          unsigned int in_num,
-                          void *data,
-                          gfp_t gfp);
-
-static inline int virtqueue_add_buf(struct virtqueue *vq,
-                                    struct scatterlist sg[],
-                                    unsigned int out_num,
-                                    unsigned int in_num,
-                                    void *data)
-{
-        return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
-}
+int virtqueue_add_buf(struct virtqueue *vq,
+                      struct scatterlist sg[],
+                      unsigned int out_num,
+                      unsigned int in_num,
+                      void *data,
+                      gfp_t gfp);
 
 void virtqueue_kick(struct virtqueue *vq);
 
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 330421e54713..3d432068f627 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -272,7 +272,8 @@ req_retry:
         in = pack_sg_list(chan->sg, out,
                           VIRTQUEUE_NUM, req->rc->sdata, req->rc->capacity);
 
-        err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc);
+        err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc,
+                                GFP_ATOMIC);
         if (err < 0) {
                 if (err == -ENOSPC) {
                         chan->ring_bufs_avail = 0;
@@ -414,7 +415,8 @@ req_retry_pinned:
                 in += pack_sg_list_p(chan->sg, out + in, VIRTQUEUE_NUM,
                                      in_pages, in_nr_pages, uidata, inlen);
 
-        err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc);
+        err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc,
+                                GFP_ATOMIC);
         if (err < 0) {
                 if (err == -ENOSPC) {
                         chan->ring_bufs_avail = 0;
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
index 953db2abf6b9..b4fbc91c41b4 100644
--- a/tools/virtio/linux/virtio.h
+++ b/tools/virtio/linux/virtio.h
@@ -186,21 +186,12 @@ struct virtqueue {
 #endif
 
 /* Interfaces exported by virtio_ring. */
-int virtqueue_add_buf_gfp(struct virtqueue *vq,
-                          struct scatterlist sg[],
-                          unsigned int out_num,
-                          unsigned int in_num,
-                          void *data,
-                          gfp_t gfp);
-
-static inline int virtqueue_add_buf(struct virtqueue *vq,
-                                    struct scatterlist sg[],
-                                    unsigned int out_num,
-                                    unsigned int in_num,
-                                    void *data)
-{
-        return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
-}
+int virtqueue_add_buf(struct virtqueue *vq,
+                      struct scatterlist sg[],
+                      unsigned int out_num,
+                      unsigned int in_num,
+                      void *data,
+                      gfp_t gfp);
 
 void virtqueue_kick(struct virtqueue *vq);
 
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 0740284396c1..6bf95f995364 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -161,7 +161,8 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
                         if (started < bufs) {
                                 sg_init_one(&sl, dev->buf, dev->buf_size);
                                 r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
-                                                      dev->buf + started);
+                                                      dev->buf + started,
+                                                      GFP_ATOMIC);
                                 if (likely(r >= 0)) {
                                         ++started;
                                         virtqueue_kick(vq->vq);