linux-kernel - Re: [PATCH] iommu/amd: Increase interrupt remapping table limit to 512 entries

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Message-ID: <20201103132133.GF22888@8bytes.org>
Date:   Tue, 3 Nov 2020 14:21:34 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] iommu/amd: Increase interrupt remapping table limit to
 512 entries

On Thu, Oct 15, 2020 at 02:50:02AM +0000, Suravee Suthikulpanit wrote:
> Certain device drivers allocate IO queues on a per-cpu basis.
> On AMD EPYC platform, which can support up-to 256 cpu threads,
> this can exceed the current MAX_IRQ_PER_TABLE limit of 256,
> and result in the error message:
> 
>     AMD-Vi: Failed to allocate IRTE
> 
> This has been observed with certain NVME devices.
> 
> AMD IOMMU hardware can actually support upto 512 interrupt
> remapping table entries. Therefore, update the driver to
> match the hardware limit.
> 
> Please note that this also increases the size of interrupt remapping
> table to 8KB per device when using the 128-bit IRTE format.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  drivers/iommu/amd/amd_iommu_types.h | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)

Applied for 5.10, thanks.