On Mon, Jul 21, 2025 at 10:59:42AM +0800, huaqian.li@siemens.com wrote:

From: Jan Kiszka <jan.kiszka@siemens.com>

The AM654 lacks an IOMMU, thus does not support isolating DMA requests
from untrusted PCI devices to selected memory regions this way. Use
static PVU-based protection instead. The PVU, when enabled, will only
accept DMA requests that address previously configured regions.

Use the availability of a restricted-dma-pool memory region as trigger
and register it as valid DMA target with the PVU. In addition, enable
the mapping of requester IDs to VirtIDs in the PCI RC. Use only a single
VirtID so far, catching all devices.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Li Hua Qian <redacted>

Reviewed-by: Siddharth Vadapalli <s-vadapalli@ti.com>

Regards,
Siddharth.