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rpmsg: virtio_rpmsg: set rpmsg_buf_size customizable 

Rpmsg buffer size is currently fixed to 512 bytes.
This patch introduces a new capability in struct virtproc_info
to tune shared buffer size between host and coprocessor
according to the needs.

Acked-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
hifive-unleashed-5.1
Loic Pallardy 2017-03-28 13:49:43 +02:00 committed by Bjorn Andersson
parent e156aba050
commit f93848f9ee
1 changed files with 13 additions and 9 deletions
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22
drivers/rpmsg/virtio_rpmsg_bus.c
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@ -45,6 +45,7 @@
* @rbufs: kernel address of rx buffers
* @sbufs: kernel address of tx buffers
* @num_bufs: total number of buffers for rx and tx
* @buf_size: size of one rx or tx buffer
* @last_sbuf: index of last tx buffer used
* @bufs_dma: dma base addr of the buffers
* @tx_lock: protects svq, sbufs and sleepers, to allow concurrent senders.
@ -65,6 +66,7 @@ struct virtproc_info {
struct virtqueue *rvq, *svq;
void *rbufs, *sbufs;
unsigned int num_bufs;
unsigned int buf_size;
int last_sbuf;
dma_addr_t bufs_dma;
struct mutex tx_lock;
@ -158,7 +160,7 @@ struct virtio_rpmsg_channel {
* processor.
*/
#define MAX_RPMSG_NUM_BUFS (512)
#define RPMSG_BUF_SIZE (512)
#define MAX_RPMSG_BUF_SIZE (512)
/*
* Local addresses are dynamically allocated on-demand.
@ -435,7 +437,7 @@ static void *get_a_tx_buf(struct virtproc_info *vrp)
* (half of our buffers are used for sending messages)
*/
if (vrp->last_sbuf < vrp->num_bufs / 2)
ret = vrp->sbufs + RPMSG_BUF_SIZE * vrp->last_sbuf++;
ret = vrp->sbufs + vrp->buf_size * vrp->last_sbuf++;
/* or recycle a used one */
else
ret = virtqueue_get_buf(vrp->svq, &len);
@ -561,7 +563,7 @@ static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
* messaging), or to improve the buffer allocator, to support
* variable-length buffer sizes.
*/
if (len > RPMSG_BUF_SIZE - sizeof(struct rpmsg_hdr)) {
if (len > vrp->buf_size - sizeof(struct rpmsg_hdr)) {
dev_err(dev, "message is too big (%d)\n", len);
return -EMSGSIZE;
}
@ -701,7 +703,7 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
* We currently use fixed-sized buffers, so trivially sanitize
* the reported payload length.
*/
if (len > RPMSG_BUF_SIZE ||
if (len > vrp->buf_size ||
msg->len > (len - sizeof(struct rpmsg_hdr))) {
dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg->len);
return -EINVAL;
@ -734,7 +736,7 @@ 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, RPMSG_BUF_SIZE);
sg_init_one(&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);
@ -891,7 +893,9 @@ static int rpmsg_probe(struct virtio_device *vdev)
else
vrp->num_bufs = MAX_RPMSG_NUM_BUFS;
total_buf_space = vrp->num_bufs * RPMSG_BUF_SIZE;
vrp->buf_size = MAX_RPMSG_BUF_SIZE;
total_buf_space = vrp->num_bufs * vrp->buf_size;
/* allocate coherent memory for the buffers */
bufs_va = dma_alloc_coherent(vdev->dev.parent->parent,
@ -914,9 +918,9 @@ static int rpmsg_probe(struct virtio_device *vdev)
/* set up the receive buffers */
for (i = 0; i < vrp->num_bufs / 2; i++) {
struct scatterlist sg;
void *cpu_addr = vrp->rbufs + i * RPMSG_BUF_SIZE;
void *cpu_addr = vrp->rbufs + i * vrp->buf_size;
sg_init_one(&sg, cpu_addr, RPMSG_BUF_SIZE);
sg_init_one(&sg, cpu_addr, vrp->buf_size);
err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, cpu_addr,
GFP_KERNEL);
@ -981,7 +985,7 @@ static int rpmsg_remove_device(struct device *dev, void *data)
static void rpmsg_remove(struct virtio_device *vdev)
{
struct virtproc_info *vrp = vdev->priv;
size_t total_buf_space = vrp->num_bufs * RPMSG_BUF_SIZE;
size_t total_buf_space = vrp->num_bufs * vrp->buf_size;
int ret;
vdev->config->reset(vdev);