Take rx and tx buffer size from virtio device config space in the resource table. This allows each firmware to configure RPMsg buffer size as needed in each direction.
Original seris: https://lore.kernel.org/all/[email protected]/ Following modificaitons are done to the original series: - Separate dma allocation is not done for tx and rx buffers. Instead allocated chunk of memory is split between tx and rx buffers. - If vdev doesn't support VIRTIO_RPMSG_F_BUFSZ feature then use the default size of 512 bytes for buffers - Change MAX_RPMSG_BUF_SIZE to DEFAULT_RPMSG_BUF_SIZE - move virtio_rpmsg.h from uapi to linux dir - RPMsg buffer size must be set to hold rpmsg header at minimum in the vdev config space of the firmware. - align total buf size to page size when allocating and deallocating memory Xiang Xiao (2): rpmsg: virtio_rpmsg_bus: allow the different vring size for send/recv rpmsg: virtio_rpmsg_bus: get buffer size from config space drivers/rpmsg/virtio_rpmsg_bus.c | 105 ++++++++++++++++++++----------- include/linux/virtio_rpmsg.h | 24 +++++++ 2 files changed, 93 insertions(+), 36 deletions(-) create mode 100644 include/linux/virtio_rpmsg.h base-commit: f982fbb1a6ca3553c15763ad9eb2beeae78d3684 -- 2.34.1
