From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Linux Kernel Mailing List <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>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Linux ARM <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: Thu, 5 Aug 2021 21:02:19 +0200 [thread overview]
Message-ID: <CAJZ5v0jikZd_SMZxL0SAwVGH_-h8C9aUPH9LoG-PUFUZG3eLjA@mail.gmail.com> (raw)
In-Reply-To: <20210803091605.GA9637@lpieralisi>
On Tue, Aug 3, 2021 at 11:16 AM Lorenzo Pieralisi
<lorenzo.pieralisi@arm.com> 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@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).
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.
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prev parent reply other threads:[~2021-08-05 19:04 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
2021-08-05 19:02 ` Rafael J. Wysocki [this message]
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