From 75a9d7504180f01abb3f63ee894476f457c6dbb5 Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Tue, 8 Mar 2022 20:36:45 +0900 Subject: [PATCH] virtio: call device_probe() in scanning virtio_init() enumerates all the peripherals that are to be materialised with udevices(UCLASS_VIRIO) and creates particular device instances (UCLASS_BlK or whatever else) as children. On the other hand, device_probe() won't be invoked against those resultant udevices unlike other ordinary device drivers do in the driver model. This is particularly inconvenient when we want to add "event notification" callback so that we will be able to automatically create all efi_disk objects in a later patch. With this patch applied, "virtio scan" will work in a similar way to "scsi rescan", "usb start" or others in term of 'probe' semantics. I didn't add this change to virtio_init() itself because this function may be called in board_init_r() (indirectly in board_late_init()) before UEFI subsustem is initialized. Signed-off-by: AKASHI Takahiro Reviewed-by: Simon Glass --- cmd/virtio.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/cmd/virtio.c b/cmd/virtio.c index 3dace53..ea3ed2e 100644 --- a/cmd/virtio.c +++ b/cmd/virtio.c @@ -17,8 +17,25 @@ static int do_virtio(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) { if (argc == 2 && !strcmp(argv[1], "scan")) { - /* make sure all virtio devices are enumerated */ - virtio_init(); + /* + * make sure all virtio devices are enumerated. + * Do the same as virtio_init(), but also call + * device_probe() for children (i.e. virtio devices) + */ + struct udevice *bus, *child; + int ret; + + ret = uclass_first_device(UCLASS_VIRTIO, &bus); + if (ret) + return CMD_RET_FAILURE; + + while (bus) { + device_foreach_child_probe(child, bus) + ; + ret = uclass_next_device(&bus); + if (ret) + break; + } return CMD_RET_SUCCESS; } -- 2.7.4