CV-Bowen opened a new pull request, #20976:
URL: https://github.com/apache/nuttx/pull/20976
## Summary
Add the device side of virtio-rpmb:
- move the RPMB request/response types, results, config space and frame
layout to `include/nuttx/virtio/virtio-rpmb.h`, declared packed like
the specification, so both sides can share them
- add the backend. It reads the path of a local block device holding the
RPMB partition from the device config space, opens it, publishes the
capacity and reliable-write count from the eMMC EXT_CSD back into the
virtio config space, and forwards each request chain as
`MMC_IOC_MULTI_CMD` on a dedicated kernel thread: request frames are
written with CMD25 and the response frame is read with CMD18
This lets a core without access to the eMMC controller relay RPMB frames
to the core that owns it.
## Impact
New, off by default: `CONFIG_DRIVERS_VHOST_RPMB` (selects
`DRIVERS_VHOST`), with `_PRIORITY` and `_STACKSIZE`. The protocol
definitions move from `drivers/virtio/virtio-rpmb.h` (private) to
`include/nuttx/virtio/virtio-rpmb.h`; the two structs are now packed,
which does not change their layout.
## Testing
Host: Ubuntu 22.04.5 LTS x86_64, QEMU version 10.2.1, sim: cc (Ubuntu
13.1.0-8ubuntu1~22.04) 13.1.0, qemu-armv8a: aarch64-none-elf-gcc (Arm GNU
Toolchain 12.2.Rel1 (Build arm-12.24)) 12.2.1 20221205
Build only: `qemu-armv8a:rpserver` with `CONFIG_DRIVERS_VHOST_RPMB=y`
builds without warnings. No in-tree transport creates a device-role
`VIRTIO_ID_RPMB` vdev yet, so the backend is not exercised at run time
here; the rpmsg baseline below only shows nothing else regressed.
Baseline (`test.sh`, cases: baseline.yaml):
- host: Ubuntu 22.04.5 LTS x86_64, QEMU version 10.2.1, sim: cc (Ubuntu
13.1.0-8ubuntu1~22.04) 13.1.0, qemu-armv8a: aarch64-none-elf-gcc (Arm GNU
Toolchain 12.2.Rel1 (Build arm-12.24)) 12.2.1 20221205
- tested: nuttx 2b237b982a5 apps ea8addeaf
- qemu-armv8a built with test-only overlay: disabled LIBC_ENVPATH
BINFMT_CHECKEXEC
- sim:rpserver + sim:rpproxy: PASS
- [x] `uname -a` (server)
- [x] `rpmsg dump all` (server)
- [x] `rpmsg ping all 10 1024 3 0` (server)
- [x] `uname -a` (proxy)
- [x] `rpmsg ping all 10 1024 3 0` (proxy)
- [x] `mount -t rpmsgfs -o cpu=server,fs=/proc /sp` (proxy)
- [x] `cat /sp/version` (proxy)
- [x] `rpmsg dump all` (proxy)
- qemu-armv8a:rpserver + qemu-armv8a:rpproxy: PASS
- [x] `uname -a` (server)
- [x] `uname -a` (proxy)
- [x] `rpmsg dump all` (server)
- [x] `rpmsg ping all 10 1024 3 0` (server)
- [x] `rpmsg ping all 10 1024 3 0` (proxy)
- [x] `mount -t rpmsgfs -o cpu=server,fs=/proc /sp` (proxy)
- [x] `cat /sp/version` (proxy)
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