From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>, rjw@rjwysocki.net
Cc: linux-kernel@vger.kernel.org, Hanjun Guo <guohanjun@huawei.com>,
Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
Veronika kabatova <vkabatov@redhat.com>,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH v2 3/3] ACPI: Add memory semantics to acpi_os_map_memory()
Date: Tue, 3 Aug 2021 10:16:05 +0100 [thread overview]
Message-ID: <20210803091605.GA9637@lpieralisi> (raw)
In-Reply-To: <20210802164622.GJ18685@arm.com>
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@arm.com
> > Tested-by: Hanjun Guo <guohanjun@huawei.com>
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > Acked-by: Ard Biesheuvel <ardb@kernel.org>
> > Cc: Ard Biesheuvel <ardb@kernel.org>
> > Cc: Will Deacon <will@kernel.org>
> > Cc: Hanjun Guo <guohanjun@huawei.com>
> > Cc: Sudeep Holla <sudeep.holla@arm.com>
> > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
>
> For the arm64 bits:
>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
>
> 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).
Lorenzo
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next prev parent reply other threads:[~2021-08-03 9:25 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 10:00 [PATCH] ACPI: Add memory semantics to acpi_os_map_memory() Lorenzo Pieralisi
2021-07-26 15:55 ` Ard Biesheuvel
2021-07-27 10:06 ` Lorenzo Pieralisi
2021-07-27 10:09 ` Ard Biesheuvel
2021-07-27 16:38 ` Lorenzo Pieralisi
2021-07-27 4:21 ` Hanjun Guo
2021-08-02 15:23 ` [PATCH v2 0/3] ACPI: Fix acpi_os_map_memory() memory semantics Lorenzo Pieralisi
2021-08-02 15:37 ` Ard Biesheuvel
2021-08-23 10:46 ` [PATCH RESEND v3] ACPI: Add memory semantics to acpi_os_map_memory() Lorenzo Pieralisi
2021-08-23 12:30 ` Catalin Marinas
2021-08-25 17:46 ` Rafael J. Wysocki
2021-08-02 15:23 ` [PATCH v2 1/3] ACPI: osl: Add __force attribute in acpi_os_map_iomem() cast Lorenzo Pieralisi
2021-08-10 16:45 ` Christoph Hellwig
2021-08-11 10:40 ` Ard Biesheuvel
2021-08-11 14:01 ` Lorenzo Pieralisi
2021-08-11 14:08 ` Christoph Hellwig
2021-08-11 14:55 ` Lorenzo Pieralisi
2021-08-16 9:58 ` Lorenzo Pieralisi
2021-08-16 10:21 ` Ard Biesheuvel
2021-08-16 10:59 ` Robin Murphy
2021-08-16 13:57 ` Rafael J. Wysocki
2021-08-02 15:23 ` [PATCH v2 2/3] ACPI: osl: Reorder acpi_os_map_iomem() __ref annotation Lorenzo Pieralisi
2021-08-02 15:23 ` [PATCH v2 3/3] ACPI: Add memory semantics to acpi_os_map_memory() Lorenzo Pieralisi
2021-08-02 16:46 ` Catalin Marinas
2021-08-03 9:16 ` Lorenzo Pieralisi [this message]
2021-08-05 19:02 ` Rafael J. Wysocki
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