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From: Joerg Roedel <joro@8bytes.org>
To: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org
Subject: Re: [PATCH] iommu/amd: Assign default IOMMU when there is only one IOMMU
Date: Mon, 14 Dec 2015 16:08:05 +0100	[thread overview]
Message-ID: <20151214150805.GE11292@8bytes.org> (raw)
In-Reply-To: <1449874478-31770-1-git-send-email-Suravee.Suthikulpanit@amd.com>

On Fri, Dec 11, 2015 at 04:54:38PM -0600, Suravee Suthikulpanit wrote:
> Current driver makes assumption that device with devid zero is always
> included in the range of devices to be managed by IOMMU. However,
> certain FW does not include devid zero in IVRS table.
> This has caused IOMMU perf driver to fail to initialize.

Hmm, this is a firmware bug. Is this bug seen in any systems that are
for sale?

> This patch implements a workaround for this case by always assign
> devid zero to be handled by the first IOMMU.

Otherwise its better to fix the firmware than to add workarounds.


	Joerg

  reply	other threads:[~2015-12-14 15:08 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-11 22:54 [PATCH] iommu/amd: Assign default IOMMU when there is only one IOMMU Suravee Suthikulpanit
2015-12-11 22:54 ` Suravee Suthikulpanit
2015-12-14 15:08 ` Joerg Roedel [this message]
2015-12-16  6:20   ` Suravee Suthikulpanit
2015-12-16  6:20     ` Suravee Suthikulpanit
2015-12-17  3:17   ` Suravee Suthikulanit
2015-12-17  3:17     ` Suravee Suthikulanit

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