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SubjectRe: [PATCH v2 3/3] ACPI: Add memory semantics to acpi_os_map_memory()
On Mon, Aug 02, 2021 at 04:23:59PM +0100, Lorenzo Pieralisi wrote:
> The memory attributes attached to memory regions depend on architecture
> specific mappings.
> For some memory regions, the attributes specified by firmware (eg
> uncached) are not sufficient to determine how a memory region should be
> mapped by an OS (for instance a region that is define as uncached in
> firmware can be mapped as Normal or Device memory on arm64) and
> therefore the OS must be given control on how to map the region to match
> the expected mapping behaviour (eg if a mapping is requested with memory
> semantics, it must allow unaligned accesses).
> Rework acpi_os_map_memory() and acpi_os_ioremap() back-end to split
> them into two separate code paths:
> acpi_os_memmap() -> memory semantics
> acpi_os_ioremap() -> MMIO semantics
> The split allows the architectural implementation back-ends to detect
> the default memory attributes required by the mapping in question
> (ie the mapping API defines the semantics memory vs MMIO) and map the
> memory accordingly.
> Link:
> Tested-by: Hanjun Guo <>
> Signed-off-by: Lorenzo Pieralisi <>
> Acked-by: Ard Biesheuvel <>
> Cc: Ard Biesheuvel <>
> Cc: Will Deacon <>
> Cc: Hanjun Guo <>
> Cc: Sudeep Holla <>
> Cc: Catalin Marinas <>
> Cc: "Rafael J. Wysocki" <>

For the arm64 bits:

Acked-by: Catalin Marinas <>

I presume this will get merged via the ACPI tree?


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