u-boot.git/drivers/virtio/virtio_ring.c, branch master

virtio: fix freeing of virtio ring buffer

2025-08-07T17:15:54+00:00

If the allocation if the bounce buffer fails, virtio_free_pages is called
with a random value from the stack.

Ensure that vring.size is initialized.

Fixes: 37e53db38bdb ("virtio: Allocate bounce buffers for devices with VIRTIO_F_IOMMU_PLATFORM")
Addresses-Coverity-ID: 453314 Uninitialized scalar variable
Signed-off-by: Heinrich Schuchardt

Restore patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"

2024-05-20T19:35:03+00:00

As part of bringing the master branch back in to next, we need to allow
for all of these changes to exist here.

Reported-by: Jonas Karlman 
Signed-off-by: Tom Rini

Revert "Merge patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet""

2024-05-19T14:16:36+00:00

When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay
Ethernet"' I failed to notice that b4 noticed it was based on next and
so took that as the base commit and merged that part of next to master.

This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing
changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35.

Reported-by: Jonas Karlman 
Signed-off-by: Tom Rini

virtio: Remove and add needed includes

2024-05-07T14:00:57+00:00

Remove  from this driver directory and when needed
add missing include files directly.

Signed-off-by: Tom Rini

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_ring: Check used descriptors are chain heads

2022-06-08T13:24:03+00:00

When the device returns used buffers, it should refer to the descriptor
that is the head of the descriptor chain for that buffer. Confirm this
to be the case by tracking the head of descriptor chains that have been
made available to the device.

Signed-off-by: Andrew Scull 
Reviewed-by: Simon Glass

virtio_ring: Maintain a shadow copy of descriptors

2022-06-08T13:24:03+00:00

The shared descriptors should only be written by the guest driver,
however, the device is still able to overwrite and corrupt them.
Maintain a private shadow copy of the descriptors for the driver to
use for state tracking, removing the need to read from the shared
descriptors.

Signed-off-by: Andrew Scull 
Reviewed-by: Simon Glass