On Tue, Aug 3, 2021 at 11:16 AM Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> wrote: > > On Mon, Aug 02, 2021 at 05:46:22PM +0100, Catalin Marinas wrote: > > 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: https://lore.kernel.org/linux-arm-kernel/31ffe8fc-f5ee-2858-26c5-0fd8bdd68702@xxxxxxx > > > Tested-by: Hanjun Guo <guohanjun@xxxxxxxxxx> > > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> > > > Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx> > > > Cc: Ard Biesheuvel <ardb@xxxxxxxxxx> > > > Cc: Will Deacon <will@xxxxxxxxxx> > > > Cc: Hanjun Guo <guohanjun@xxxxxxxxxx> > > > Cc: Sudeep Holla <sudeep.holla@xxxxxxx> > > > Cc: Catalin Marinas <catalin.marinas@xxxxxxx> > > > Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx> > > > > For the arm64 bits: > > > > Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> > > > > I presume this will get merged via the ACPI tree? > > Thank you, I don't know what's the best option in Rafael's opinion > (of course if he is OK with the patches which are mostly touching > ACPI code). Well, I can apply them. I'll queue them up tomorrow, but next week I'm on vacation, so they will show up in linux-next after -rc6. Hopefully, that's not too late.
