Hi Greg
Can we define MACRO to replace 1 or 2? That is very confusing.
For example,
#define VIRT_IO_DEVICE_VERSION_0_95 1
#define VIRT_IO_DEVICE_VERSION_1_00 2
Thank you
Yao Jiewen
> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Gerd
> Hoffmann
> Sent: Monday, August 16, 2021 3:11 PM
> To: devel@edk2.groups.io
> Cc: Gerd Hoffmann <kra...@redhat.com>; Philippe Mathieu-Daude
> <phi...@redhat.com>
> Subject: [edk2-devel] [PATCH v2 2/4] OvmfPkg/VirtioMmioDeviceLib: Add virtio
> 1.0 support.
>
> Add support for virtio 1.0 to the mmio transport. virtio 0.9.5 uses
> page size, page frame number and a fixed layout for the ring. virtio
> 1.0 uses the physical addresses for base address, used bits and
> available bits instead.
>
> The ring layout is not changed, so a 0.9.5 compatible layout is used in
> both 0.9.5 and 1.0 mode to to keep the code differences as small as
> possible.
>
> Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
> Reviewed-by: Philippe Mathieu-Daude <phi...@redhat.com>
> ---
> .../VirtioMmioDeviceLib/VirtioMmioDevice.h | 1 +
> .../VirtioMmioDeviceLib/VirtioMmioDevice.c | 17 +++++++---
> .../VirtioMmioDeviceFunctions.c | 31 +++++++++++++++++--
> 3 files changed, 42 insertions(+), 7 deletions(-)
>
> diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
> b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
> index ab53b90d51c9..8b19996b716f 100644
> --- a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
> +++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
> @@ -26,6 +26,7 @@
>
> typedef struct {
> UINT32 Signature;
> + UINT32 Version;
> VIRTIO_DEVICE_PROTOCOL VirtioDevice;
> PHYSICAL_ADDRESS BaseAddress;
> } VIRTIO_MMIO_DEVICE;
> diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
> b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
> index 6dbbba008c75..a8f78a50861b 100644
> --- a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
> +++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
> @@ -58,7 +58,6 @@ VirtioMmioInit (
> )
> {
> UINT32 MagicValue;
> - UINT32 Version;
>
> //
> // Initialize VirtIo Mmio Device
> @@ -66,7 +65,6 @@ VirtioMmioInit (
> CopyMem (&Device->VirtioDevice, &mMmioDeviceProtocolTemplate,
> sizeof (VIRTIO_DEVICE_PROTOCOL));
> Device->BaseAddress = BaseAddress;
> - Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);
> Device->VirtioDevice.SubSystemDeviceId =
> MmioRead32 (BaseAddress + VIRTIO_MMIO_OFFSET_DEVICE_ID);
>
> @@ -78,8 +76,19 @@ VirtioMmioInit (
> return EFI_UNSUPPORTED;
> }
>
> - Version = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_VERSION);
> - if (Version != 1) {
> + Device->Version = VIRTIO_CFG_READ (Device,
> VIRTIO_MMIO_OFFSET_VERSION);
> + switch (Device->Version) {
> + case 1:
> + DEBUG ((DEBUG_INFO, "%a virtio 0.9.5, id %d\n", __FUNCTION__,
> + Device->VirtioDevice.SubSystemDeviceId));
> + Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);
> + break;
> + case 2:
> + DEBUG ((DEBUG_INFO, "%a virtio 1.0, id %d\n", __FUNCTION__,
> + Device->VirtioDevice.SubSystemDeviceId));
> + Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (1, 0, 0);
> + break;
> + default:
> return EFI_UNSUPPORTED;
> }
>
> diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
> b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
> index b0d75fb1dd24..bf8523a6fb3b 100644
> --- a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
> +++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
> @@ -151,7 +151,9 @@ VirtioMmioSetPageSize (
>
> Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
>
> - VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_PAGE_SIZE,
> PageSize);
> + if (Device->Version == 1) {
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_PAGE_SIZE,
> PageSize);
> + }
>
> return EFI_SUCCESS;
> }
> @@ -181,13 +183,36 @@ VirtioMmioSetQueueAddress (
> )
> {
> VIRTIO_MMIO_DEVICE *Device;
> + UINT64 Address;
>
> ASSERT (RingBaseShift == 0);
>
> Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
>
> - VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_PFN,
> - (UINT32)((UINTN)Ring->Base >> EFI_PAGE_SHIFT));
> + if (Device->Version == 1) {
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_PFN,
> + (UINT32)((UINTN)Ring->Base >> EFI_PAGE_SHIFT));
> + } else {
> + Address = (UINT64)Ring->Base;
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_DESC_LO,
> + (UINT32)Address);
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_DESC_HI,
> + (UINT32)RShiftU64(Address, 32));
> +
> + Address = (UINT64)Ring->Avail.Flags;
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_AVAIL_LO,
> + (UINT32)Address);
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_AVAIL_HI,
> + (UINT32)RShiftU64(Address, 32));
> +
> + Address = (UINT64)Ring->Used.Flags;
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_USED_LO,
> + (UINT32)Address);
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_USED_HI,
> + (UINT32)RShiftU64(Address, 32));
> +
> + VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_READY, 1);
> + }
>
> return EFI_SUCCESS;
> }
> --
> 2.31.1
>
>
>
>
>
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