u-boot.git/drivers/virtio, branch v2023.07

virtio: Ensure PCI is set up first

2023-04-26T12:43:04+00:00

Sometimes virtio may rely on PCI, or at least that is what the
distro_bootcmd script suggests. Add this in.

Signed-off-by: Simon Glass

virtio: Use bounce buffers when VIRTIO_F_IOMMU_PLATFORM is set

2023-04-25T15:53:15+00:00

Devices advertising the VIRTIO_F_IOMMU_PLATFORM feature require
platform-specific handling to configure their DMA transactions.

When handling virtio descriptors for such a device, use bounce
buffers to ensure that the underlying buffers are always aligned
to and padded to PAGE_SIZE in preparation for platform specific
handling at page granularity.

Signed-off-by: Will Deacon 
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Cc: Bin Meng 
Link: https://android.googlesource.com/platform/external/u-boot/+/1eff171e613ee67dca71dbe97be7282e2db17011
Reviewed-by: Simon Glass

virtio: Allocate bounce buffers for devices with VIRTIO_F_IOMMU_PLATFORM

2023-04-25T15:53:15+00:00

In preparation for bouncing virtio data for devices advertising the
VIRTIO_F_IOMMU_PLATFORM feature, allocate an array of bounce buffer
structures in the vring, one per descriptor.

Signed-off-by: Will Deacon 
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Cc: Bin Meng 
Link: https://android.googlesource.com/platform/external/u-boot/+/3e052749e7c50c4c1a6014e645ae3b9be3710c07
Reviewed-by: Simon Glass

virtio: Add helper functions to attach/detach vring descriptors

2023-04-25T15:53:15+00:00

Move the attach and detach logic for manipulating vring descriptors
out into their own functions so that we can later extend these to
bounce the data for devices with VIRTIO_F_IOMMU_PLATFORM set.

Signed-off-by: Will Deacon 
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Cc: Bin Meng 
Link: https://android.googlesource.com/platform/external/u-boot/+/f73258a4bfe968c5f935db45f2ec5cc0104ee796
Reviewed-by: Simon Glass

virtio: Allocate virtqueue in page-size units

2023-04-25T15:53:15+00:00

In preparation for explicit bouncing of virtqueue pages for devices
advertising the VIRTIO_F_IOMMU_PLATFORM feature, introduce a couple
of wrappers around virtqueue allocation and freeing operations,
ensuring that buffers are handled in terms of page-size units.

Signed-off-by: Will Deacon 
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Cc: Bin Meng 
Link: https://android.googlesource.com/platform/external/u-boot/+/b4bb5227d4cf4fdfcd8b4e1ff2692d3a54d1482a
Reviewed-by: Simon Glass

virtio: pci: Tear down VQs in virtio_pci_reset()

2023-04-25T15:53:15+00:00

The pages backing the virtqueues for virtio PCI devices are not freed
on reset, despite the virtqueue structure being freed as part of the
driver '->priv_auto' destruction at ->remove() time.

Call virtio_pci_del_vqs() from virtio_pci_reset() to free the virtqueue
pages before freeing the virtqueue structure itself.

Signed-off-by: Will Deacon 
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Cc: Bin Meng 
Link: https://android.googlesource.com/platform/external/u-boot/+/5ed54ccd83cbffd0d8719ce650604b4e44b5b0d8
Reviewed-by: Simon Glass

virtio: Expose VIRTIO_F_IOMMU_PLATFORM in device features

2023-04-25T15:53:15+00:00

If we detect the VIRTIO_F_IOMMU_PLATFORM transport feature for a device,
then expose it in the device features.

Signed-off-by: Will Deacon 
[ Paul: pick from the Android tree. Rebase to the upstream ]
Signed-off-by: Ying-Chun Liu (PaulLiu) 
Cc: Bin Meng 
Link: https://android.googlesource.com/platform/external/u-boot/+/9693bd26bfcfe77d6a1295a561420e08c5daf019
Reviewed-by: Simon Glass

bootstd: Correct virtio block-device handling

2023-02-06T18:04:53+00:00

At present virtio tries to attach QEMU services to a bootdev device, which
cannot work. Add a check for this.

Also use bootdev_setup_sibling_blk() to create the bootdev device, since
it allows the correct name to be used and bootdev_get_sibling_blk() to
work as expected.

The bootdev is not created on sandbox since it does have a real virtio
device and it is not possible to read blocks.

Signed-off-by: Simon Glass 
Fixes: a60f7a3e35b ("bootstd: Add a virtio bootdev")
Reported-by: Ilias Apalodimas

virtio: Add some debugging

2023-02-06T18:04:53+00:00

When QEMU does not respond for some reason, it is helpful to have
debugging info to show. Add some.

Signed-off-by: Simon Glass

bootstd: Add a new pre-scan priority for bootdevs

2023-01-23T23:11:41+00:00

We need extensions to be set up before we start trying to boot any of the
bootdevs. Add a new priority before all the others for tht sort of thing.
Also add a 'none' option, so that the first one is not 0.

While we are here, comment enum bootdev_prio_t fully and expand the test
for the 'bootdev hunt' command.

Signed-off-by: Simon Glass