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virtio: add_buf_gfp

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Add an add_buf variant that gets gfp parameter. Use that
to allocate indirect buffers.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin 2010-04-29 17:26:37 +03:00 • committed by Rusty Russell
parent dc3f5e68f8
commit bbd603efb4
2 changed files with 28 additions and 14 deletions
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22
include/linux/virtio.h
View file

@ -7,6 +7,7 @@
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/gfp.h>
/**
* virtqueue - a queue to register buffers for sending or receiving.
@ -32,6 +33,7 @@ struct virtqueue {
* out_num: the number of sg readable by other side
* in_num: the number of sg which are writable (after readable ones)
* data: the token identifying the buffer.
* gfp: how to do memory allocations (if necessary).
* Returns remaining capacity of queue (sg segments) or a negative error.
* virtqueue_kick: update after add_buf
* vq: the struct virtqueue
@ -60,11 +62,21 @@ struct virtqueue {
* All operations can be called in any context.
*/
int virtqueue_add_buf(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data);
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);
}
void virtqueue_kick(struct virtqueue *vq);