[PATCH] arm64: mm: Treat all devices as dma-coherent when CLIDR_EL1.LoC == 0

[Will Deacon]

On Thu, 23 Jul 2026 14:03:21 +0100, Will Deacon wrote:
> On systems where CLIDR_EL1.LoC == 0, no cache maintenance is required
> when cleaning or invalidating to the Point of Coherency and therefore
> all DMA agents can be treated as coherent.
> 
> Extend arch_setup_dma_ops() to take CLIDR_EL1.LoC into account when
> setting the DMA ops for a device, emitting a warning message if the
> firmware advertises a non-coherent device on a fully coherent system.
> 
> [...]

Applied to arm64 (for-next/mm), thanks!

[1/1] arm64: mm: Treat all devices as dma-coherent when CLIDR_EL1.LoC == 0
      https://git.kernel.org/arm64/c/233b5554e07b

Cheers,
-- 
Will

https://fixes.arm64.dev
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