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Subject[PATCH 3/3] rpmsg: virtio_rpmsg_bus: get buffer size from config space
Date
512 bytes isn't always suitable for all case, let firmware
maker decide the best value from resource table.
enable by VIRTIO_RPMSG_F_BUFSZ feature bit.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
---
drivers/rpmsg/virtio_rpmsg_bus.c | 50 +++++++++++++++++++++++++--------------
include/uapi/linux/virtio_rpmsg.h | 24 +++++++++++++++++++
2 files changed, 56 insertions(+), 18 deletions(-)
create mode 100644 include/uapi/linux/virtio_rpmsg.h

diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
index 59c4554..049dd97 100644
--- a/drivers/rpmsg/virtio_rpmsg_bus.c
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -16,6 +16,7 @@
#include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
+#include <linux/virtio_rpmsg.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
@@ -38,7 +39,8 @@
* @sbufs: kernel address of tx buffers
* @num_rbufs: total number of buffers for rx
* @num_sbufs: total number of buffers for tx
- * @buf_size: size of one rx or tx buffer
+ * @rbuf_size: size of one rx buffer
+ * @sbuf_size: size of one tx buffer
* @last_sbuf: index of last tx buffer used
* @rbufs_dma: dma base addr of rx buffers
* @sbufs_dma: dma base addr of tx buffers
@@ -61,7 +63,8 @@ struct virtproc_info {
void *rbufs, *sbufs;
unsigned int num_rbufs;
unsigned int num_sbufs;
- unsigned int buf_size;
+ unsigned int rbuf_size;
+ unsigned int sbuf_size;
int last_sbuf;
dma_addr_t rbufs_dma;
dma_addr_t sbufs_dma;
@@ -73,9 +76,6 @@ struct virtproc_info {
struct rpmsg_endpoint *ns_ept;
};

-/* The feature bitmap for virtio rpmsg */
-#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
-
/**
* struct rpmsg_hdr - common header for all rpmsg messages
* @src: source address
@@ -452,7 +452,7 @@ static void *get_a_tx_buf(struct virtproc_info *vrp)

/* either pick the next unused tx buffer */
if (vrp->last_sbuf < vrp->num_sbufs)
- ret = vrp->sbufs + vrp->buf_size * vrp->last_sbuf++;
+ ret = vrp->sbufs + vrp->sbuf_size * vrp->last_sbuf++;
/* or recycle a used one */
else
ret = virtqueue_get_buf(vrp->svq, &len);
@@ -578,7 +578,7 @@ 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 > vrp->buf_size - sizeof(struct rpmsg_hdr)) {
+ if (len > vrp->sbuf_size - sizeof(struct rpmsg_hdr)) {
dev_err(dev, "message is too big (%d)\n", len);
return -EMSGSIZE;
}
@@ -718,7 +718,7 @@ 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 > vrp->buf_size ||
+ if (len > vrp->rbuf_size ||
msg->len > (len - sizeof(struct rpmsg_hdr))) {
dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg->len);
return -EINVAL;
@@ -751,7 +751,7 @@ 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 */
- rpmsg_sg_init(&sg, msg, vrp->buf_size);
+ rpmsg_sg_init(&sg, msg, vrp->rbuf_size);

/* add the buffer back to the remote processor's virtqueue */
err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, msg, GFP_KERNEL);
@@ -907,11 +907,24 @@ static int rpmsg_probe(struct virtio_device *vdev)
else
vrp->num_sbufs = MAX_RPMSG_NUM_BUFS;

- vrp->buf_size = MAX_RPMSG_BUF_SIZE;
+ /* try to get buffer size from config space */
+ if (virtio_has_feature(vdev, VIRTIO_RPMSG_F_BUFSZ)) {
+ /* note: virtio_rpmsg_config is defined from remote view */
+ virtio_cread(vdev, struct virtio_rpmsg_config,
+ txbuf_size, &vrp->rbuf_size);
+ virtio_cread(vdev, struct virtio_rpmsg_config,
+ rxbuf_size, &vrp->sbuf_size);
+ }
+
+ /* use the default if resource table doesn't provide one */
+ if (!vrp->rbuf_size)
+ vrp->rbuf_size = MAX_RPMSG_BUF_SIZE;
+ if (!vrp->sbuf_size)
+ vrp->sbuf_size = MAX_RPMSG_BUF_SIZE;

/* allocate coherent memory for the buffers */
vrp->rbufs = dma_alloc_coherent(vdev->dev.parent->parent,
- vrp->num_rbufs * vrp->buf_size,
+ vrp->num_rbufs * vrp->rbuf_size,
&vrp->rbufs_dma, GFP_KERNEL);
if (!vrp->rbufs) {
err = -ENOMEM;
@@ -922,7 +935,7 @@ static int rpmsg_probe(struct virtio_device *vdev)
vrp->rbufs, &vrp->rbufs_dma);

vrp->sbufs = dma_alloc_coherent(vdev->dev.parent->parent,
- vrp->num_sbufs * vrp->buf_size,
+ vrp->num_sbufs * vrp->sbuf_size,
&vrp->sbufs_dma, GFP_KERNEL);
if (!vrp->sbufs) {
err = -ENOMEM;
@@ -935,9 +948,9 @@ static int rpmsg_probe(struct virtio_device *vdev)
/* set up the receive buffers */
for (i = 0; i < vrp->num_rbufs; i++) {
struct scatterlist sg;
- void *cpu_addr = vrp->rbufs + i * vrp->buf_size;
+ void *cpu_addr = vrp->rbufs + i * vrp->rbuf_size;

- rpmsg_sg_init(&sg, cpu_addr, vrp->buf_size);
+ rpmsg_sg_init(&sg, cpu_addr, vrp->rbuf_size);

err = virtqueue_add_inbuf(vrp->rvq, &sg, 1, cpu_addr,
GFP_KERNEL);
@@ -984,11 +997,11 @@ static int rpmsg_probe(struct virtio_device *vdev)

free_sbufs:
dma_free_coherent(vdev->dev.parent->parent,
- vrp->num_sbufs * vrp->buf_size,
+ vrp->num_sbufs * vrp->sbuf_size,
vrp->sbufs, vrp->sbufs_dma);
free_rbufs:
dma_free_coherent(vdev->dev.parent->parent,
- vrp->num_rbufs * vrp->buf_size,
+ vrp->num_rbufs * vrp->rbuf_size,
vrp->rbufs, vrp->rbufs_dma);
vqs_del:
vdev->config->del_vqs(vrp->vdev);
@@ -1023,10 +1036,10 @@ static void rpmsg_remove(struct virtio_device *vdev)
vdev->config->del_vqs(vrp->vdev);

dma_free_coherent(vdev->dev.parent->parent,
- vrp->num_sbufs * vrp->buf_size,
+ vrp->num_sbufs * vrp->sbuf_size,
vrp->sbufs, vrp->sbufs_dma);
dma_free_coherent(vdev->dev.parent->parent,
- vrp->num_rbufs * vrp->buf_size,
+ vrp->num_rbufs * vrp->rbuf_size,
vrp->rbufs, vrp->rbufs_dma);

kfree(vrp);
@@ -1039,6 +1052,7 @@ static struct virtio_device_id id_table[] = {

static unsigned int features[] = {
VIRTIO_RPMSG_F_NS,
+ VIRTIO_RPMSG_F_BUFSZ,
};

static struct virtio_driver virtio_ipc_driver = {
diff --git a/include/uapi/linux/virtio_rpmsg.h b/include/uapi/linux/virtio_rpmsg.h
new file mode 100644
index 0000000..24fa0dd
--- /dev/null
+++ b/include/uapi/linux/virtio_rpmsg.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) Pinecone Inc. 2019
+ * Copyright (C) Xiang Xiao <xiaoxiang@pinecone.net>
+ */
+
+#ifndef _UAPI_LINUX_VIRTIO_RPMSG_H
+#define _UAPI_LINUX_VIRTIO_RPMSG_H
+
+#include <linux/types.h>
+
+/* The feature bitmap for virtio rpmsg */
+#define VIRTIO_RPMSG_F_NS 0 /* RP supports name service notifications */
+#define VIRTIO_RPMSG_F_BUFSZ 2 /* RP get buffer size from config space */
+
+struct virtio_rpmsg_config {
+ /* The tx/rx individual buffer size(if VIRTIO_RPMSG_F_BUFSZ) */
+ __u32 txbuf_size;
+ __u32 rxbuf_size;
+ __u32 reserved[14]; /* Reserve for the future use */
+ /* Put the customize config here */
+} __attribute__((packed));
+
+#endif /* _UAPI_LINUX_VIRTIO_RPMSG_H */
--
2.7.4
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