From: Will Deacon <will@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alex Williamson <alex.williamson@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
iommu <iommu@lists.linux-foundation.org>,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [GIT PULL] IOMMU fix for 5.10 (-final)
Date: Wed, 9 Dec 2020 18:50:20 +0000 [thread overview]
Message-ID: <20201209185020.GC8778@willie-the-truck> (raw)
In-Reply-To: <CAHk-=wht4inbTVVMt2TNDxR_cVjSNaBU3JYyKtRMVovWePb65g@mail.gmail.com>
On Wed, Dec 09, 2020 at 10:07:46AM -0800, Linus Torvalds wrote:
> On Wed, Dec 9, 2020 at 6:12 AM Will Deacon <will@kernel.org> wrote:
> >
> > Please pull this one-liner AMD IOMMU fix for 5.10. It's actually a fix
> > for a fix, where the size of the interrupt remapping table was increased
> > but a related constant for the size of the interrupt table was forgotten.
>
> Pulled.
Thanks.
> However, why didn't this then add some sanity checking for the two
> different #defines to be in sync?
>
> IOW, something like
>
> #define AMD_IOMMU_IRQ_TABLE_SHIFT 9
>
> #define MAX_IRQS_PER_TABLE (1 << AMD_IOMMU_IRQ_TABLE_SHIFT)
> #define DTE_IRQ_TABLE_LEN ((u64)AMD_IOMMU_IRQ_TABLE_SHIFT << 1)
>
> or whatever. Hmm?
This looks like a worthwhile change to me, but I don't have any hardware
so I've been very reluctant to make even "obvious" driver changes here.
Suravee -- please can you post a patch implementing the above?
> That way this won't happen again, but perhaps equally importantly the
> linkage will be more clear, and there won't be those random constants.
>
> Naming above is probably garbage - I assume there's some actual
> architectural name for that irq table length field in the DTE?
The one in the spec is even better: "IntTabLen".
Will
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next prev parent reply other threads:[~2020-12-09 18:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 14:12 [GIT PULL] IOMMU fix for 5.10 (-final) Will Deacon
2020-12-09 18:07 ` Linus Torvalds
2020-12-09 18:50 ` Will Deacon [this message]
2020-12-09 19:12 ` Jerry Snitselaar
2020-12-09 19:15 ` Jerry Snitselaar
2020-12-09 19:17 ` Linus Torvalds
2020-12-09 19:23 ` Jerry Snitselaar
2020-12-10 11:55 ` Suravee Suthikulpanit
2020-12-09 18:09 ` pr-tracker-bot
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