diff options
Diffstat (limited to 'drivers/rpmsg/virtio_rpmsg_bus.c')
| -rw-r--r-- | drivers/rpmsg/virtio_rpmsg_bus.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c index fd7a033485cf..82b83002fcba 100644 --- a/drivers/rpmsg/virtio_rpmsg_bus.c +++ b/drivers/rpmsg/virtio_rpmsg_bus.c @@ -195,6 +195,28 @@ static const struct rpmsg_endpoint_ops virtio_endpoint_ops = { }; /** + * rpmsg_sg_init - initialize scatterlist according to cpu address location + * @sg: scatterlist to fill + * @cpu_addr: virtual address of the buffer + * @len: buffer length + * + * An internal function filling scatterlist according to virtual address + * location (in vmalloc or in kernel). + */ +static void +rpmsg_sg_init(struct scatterlist *sg, void *cpu_addr, unsigned int len) +{ + if (is_vmalloc_addr(cpu_addr)) { + sg_init_table(sg, 1); + sg_set_page(sg, vmalloc_to_page(cpu_addr), len, + offset_in_page(cpu_addr)); + } else { + WARN_ON(!virt_addr_valid(cpu_addr)); + sg_init_one(sg, cpu_addr, len); + } +} + +/** * __ept_release() - deallocate an rpmsg endpoint * @kref: the ept's reference count * @@ -612,7 +634,7 @@ static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev, msg, sizeof(*msg) + msg->len, true); #endif - sg_init_one(&sg, msg, sizeof(*msg) + len); + rpmsg_sg_init(&sg, msg, sizeof(*msg) + len); mutex_lock(&vrp->tx_lock); @@ -736,7 +758,7 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev, dev_warn(dev, "msg received with no recipient\n"); /* publish the real size of the buffer */ - sg_init_one(&sg, msg, vrp->buf_size); + rpmsg_sg_init(&sg, msg, vrp->buf_size); /* add the buffer back to the remote processor's virtqueue */ err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, msg, GFP_KERNEL); @@ -920,7 +942,7 @@ static int rpmsg_probe(struct virtio_device *vdev) struct scatterlist sg; void *cpu_addr = vrp->rbufs + i * vrp->buf_size; - sg_init_one(&sg, cpu_addr, vrp->buf_size); + rpmsg_sg_init(&sg, cpu_addr, vrp->buf_size); err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, cpu_addr, GFP_KERNEL); |