Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Thu, 28 Jan 2021 09:11:58 -0800
From:   Moritz Fischer <mdf@kernel.org>
To:     Catalin Marinas <catalin.marinas@arm.com>
Cc:     lorenzo.pieralisi@arm.com, Moritz Fischer <mdf@kernel.org>,
        Will Deacon <will@kernel.org>, guohanjun@huawei.com,
        sudeep.holla@arm.com, linux-acpi@vger.kernel.org,
        moritzf@google.com, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, rjw@rjwysocki.net
Subject: Re: [PATCH v2] ACPI/IORT: Do not blindly trust DMA masks from
 firmware
Message-ID: <YBLwXgUJR4L6IiSl@epycbox.lan>
References: <20210122012419.95010-1-mdf@kernel.org>
 <161175296410.16506.7622624950228429208.b4-ty@arm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <161175296410.16506.7622624950228429208.b4-ty@arm.com>
Precedence: bulk

Hi Catalin,

On Wed, Jan 27, 2021 at 01:09:36PM +0000, Catalin Marinas wrote:
> On Thu, 21 Jan 2021 17:24:19 -0800, Moritz Fischer wrote:
> > Address issue observed on real world system with suboptimal IORT table
> > where DMA masks of PCI devices would get set to 0 as result.
> > 
> > iort_dma_setup() would query the root complex'/named component IORT
> > entry for a DMA mask, and use that over the one the device has been
> > configured with earlier.
> > 
> > [...]
> 
> Applied to arm64 (for-next/fixes), thanks!
> 
> [1/1] ACPI/IORT: Do not blindly trust DMA masks from firmware
>       https://git.kernel.org/arm64/c/a1df829ead58
> 
> -- 
> Catalin
> 

Should we consider this for stable, too? If so I can send an email to
stable@ once it's in Linus' tree, since I'm the one forgetting to CC
stable in the first place :)

It would be nice if at least 5.10 would get this.

Cheers,
Moritz