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rpmsg buf size config via vdev config space. #106

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d43f672
legacy_apps: zynqmp_r5: introduce rpmsg vdev config space
tnmysh Apr 28, 2026
10e2dd8
legacy_apps: zynqmp_r5: init rpmsg vdev with config
tnmysh Apr 29, 2026
85ce487
legacy_apps: echo: print tx and rx buffer size
tnmysh Apr 29, 2026
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4 changes: 2 additions & 2 deletions examples/legacy_apps/examples/echo/rpmsg-echo.c
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Original file line number Diff line number Diff line change
Expand Up @@ -79,8 +79,8 @@ int rpmsg_echo_app(struct rpmsg_device *rdev, void *priv)
"created rpmsg channel %s, src=0x%x, dst=0x%x\r\n",
RPMSG_SERVICE_NAME, lept.addr, lept.dest_addr);

metal_dbg("RPMsg device TX buffer size: %#x\r\n", rpmsg_get_tx_buffer_size(&lept));
metal_dbg("RPMsg device RX buffer size: %#x\r\n", rpmsg_get_rx_buffer_size(&lept));
metal_info("RPMsg device TX buffer size: %d\r\n", rpmsg_get_tx_buffer_size(&lept));
metal_info("RPMsg device RX buffer size: %d\r\n", rpmsg_get_rx_buffer_size(&lept));

while(1) {
platform_poll(priv);
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9 changes: 6 additions & 3 deletions examples/legacy_apps/machine/xlnx/zynqmp_r5/platform_info.c
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Expand Up @@ -408,6 +408,7 @@ platform_create_rpmsg_vdev(void *platform, unsigned int vdev_index,
void (*rst_cb)(struct virtio_device *vdev),
rpmsg_ns_bind_cb ns_bind_cb)
{
struct remote_resource_table *rsc_tbl;
struct remoteproc *rproc = platform;
struct rpmsg_virtio_device *rpmsg_vdev;
struct virtio_device *vdev;
Expand All @@ -417,6 +418,8 @@ platform_create_rpmsg_vdev(void *platform, unsigned int vdev_index,

restore_initial_rsc_table();

rsc_tbl = rproc->rsc_table;

rpmsg_vdev = metal_allocate_memory(sizeof(*rpmsg_vdev));
if (!rpmsg_vdev)
return NULL;
Expand All @@ -440,9 +443,9 @@ platform_create_rpmsg_vdev(void *platform, unsigned int vdev_index,

metal_dbg("initializing rpmsg vdev\r\n");
/* RPMsg virtio device can set shared buffers pool argument to NULL */
ret = rpmsg_init_vdev(rpmsg_vdev, vdev, ns_bind_cb,
shbuf_io,
&shpool);
ret = rpmsg_init_vdev_with_config(rpmsg_vdev, vdev, ns_bind_cb,
shbuf_io, &shpool,
&rsc_tbl->vdev_config);
if (ret) {
metal_err("failed rpmsg_init_vdev\r\n");
goto err2;
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18 changes: 14 additions & 4 deletions examples/legacy_apps/machine/xlnx/zynqmp_r5/rsc_table.c
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Expand Up @@ -21,8 +21,9 @@

#define RSC_TBL_XLNX_MAGIC ((uint32_t)'x' << 24 | (uint32_t)'a' << 16 | \
(uint32_t)'m' << 8 | (uint32_t)'p')

#define RPMSG_VDEV_DFEATURES (1 << VIRTIO_RPMSG_F_NS)

#define RPMSG_VDEV_DFEATURES (1 << VIRTIO_RPMSG_F_NS | \
1 << VIRTIO_RPMSG_F_BUFSZ)

/* VirtIO rpmsg device id */
#define VIRTIO_ID_RPMSG_ 7
Expand Down Expand Up @@ -58,14 +59,23 @@ struct remote_resource_table __resource resources = {

/* Virtio device entry */
.rpmsg_vdev = {
RSC_VDEV, VIRTIO_ID_RPMSG_, 31, RPMSG_VDEV_DFEATURES, 0, 0, 0,
RSC_VDEV, VIRTIO_ID_RPMSG_, 31, RPMSG_VDEV_DFEATURES, 0,
/* vdev config space len */
sizeof(struct rpmsg_virtio_config), 0,
NUM_VRINGS, {0, 0},
},

/* Vring rsc entry - part of vdev rsc entry */
{RING_TX, VRING_ALIGN, VRING_SIZE, 1, 0},
{RING_RX, VRING_ALIGN, VRING_SIZE, 2, 0},

/* vdev config space */
.vdev_config = {
.version = 1,
.size = (uint16_t)sizeof(struct rpmsg_virtio_config),
.h2r_buf_size = 512, /* host to remote, i.e. tx for host */
.r2h_buf_size = 512, /* remote to host, i.e. rx for host */
.split_shpool = false
},
/* trace buffer for logs, accessible via debugfs */
.rsc_trace = {
.type = RSC_TRACE,
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1 change: 1 addition & 0 deletions examples/legacy_apps/machine/xlnx/zynqmp_r5/rsc_table.h
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Expand Up @@ -34,6 +34,7 @@ struct remote_resource_table {
struct fw_rsc_vdev rpmsg_vdev;
struct fw_rsc_vdev_vring rpmsg_vring0;
struct fw_rsc_vdev_vring rpmsg_vring1;
struct rpmsg_virtio_config vdev_config;
struct fw_rsc_trace rsc_trace;
}__attribute__((packed, aligned(0x100)));

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