iommu/exynos: decode the v7 fault transaction info

The v7+ fault registers carry a transaction-info word alongside the
faulting address, but it is only used to derive the read/write
direction and then thrown away.  Keep it and print it: AxID identifies
which port inside the master issued the faulting transaction, which is
the only way to tell apart the several DMA engines a single block can
contain, and the remaining bits of the raw word are implementation
defined and worth having in a fault report.

Define the known fields of the word instead of open-coding the masks;
this also names the direction bit the driver was already testing as a
bare BIT(20).

Gate the print on the variant having a fault_info register, so older
SysMMUs are unaffected.

Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

0 files changed, 0 insertions, 0 deletions