From: "Limonciello, Mario" <Mario.Limonciello@amd.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>,
"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Will Deacon <will@kernel.org>,
Andreas Noever <andreas.noever@gmail.com>,
Michael Jamet <michael.jamet@intel.com>,
Yehezkel Bernat <YehezkelShB@gmail.com>,
"open list:AMD IOMMU (AMD-VI)" <iommu@lists.linux-foundation.org>,
open list <linux-kernel@vger.kernel.org>,
"open list:THUNDERBOLT DRIVER" <linux-usb@vger.kernel.org>
Subject: RE: [PATCH 2/2] thunderbolt: Use pre-boot DMA protection on AMD systems
Date: Tue, 15 Mar 2022 16:54:08 +0000 [thread overview]
Message-ID: <BL1PR12MB5157D7B7734122684D47923AE2109@BL1PR12MB5157.namprd12.prod.outlook.com> (raw)
In-Reply-To: <YjDDUUeZ/dvUZoDN@infradead.org>
[Public]
> On Tue, Mar 15, 2022 at 11:24:55AM -0500, Mario Limonciello wrote:
> > - * handled natively using IOMMU. It is enabled when IOMMU is
> > - * enabled and ACPI DMAR table has DMAR_PLATFORM_OPT_IN set.
> > + * handled natively using IOMMU. It is enabled when the IOMMU is
> > + * enabled and either:
> > + * ACPI DMAR table has DMAR_PLATFORM_OPT_IN set
> > + * or
> > + * ACPI IVRS table has DMA_REMAP bitset
> > */
> > return sprintf(buf, "%d\n",
> > - iommu_present(&pci_bus_type) &&
> dmar_platform_optin());
> > + iommu_present(&pci_bus_type) &&
> > + (dmar_platform_optin() || amd_ivrs_remap_support()));
>
> Yikes. No, the thunderbot code does not have any business poking into
> either dmar_platform_optin or amd_ivrs_remap_support. This needs
> a proper abstration from the IOMMU code.
To make sure I follow your ask - it's to make a new generic iommu function
That would check dmar/ivrs, and switch out thunderbolt domain.c to use the
symbol?
I'm happy to rework that if that is what you want.
Do you have a preferred proposed function name for that?
next prev parent reply other threads:[~2022-03-15 16:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-15 16:24 [PATCH 1/2] iommu/amd: Add support to indicate whether DMA remap support is enabled Mario Limonciello
2022-03-15 16:24 ` [PATCH 2/2] thunderbolt: Use pre-boot DMA protection on AMD systems Mario Limonciello
2022-03-15 16:48 ` Christoph Hellwig
2022-03-15 16:54 ` Limonciello, Mario [this message]
2022-03-15 18:07 ` Robin Murphy
2022-03-15 18:36 ` Limonciello, Mario
2022-03-15 21:34 ` Limonciello, Mario
2022-03-15 22:04 ` Robin Murphy
2022-03-16 9:50 ` Mika Westerberg
2022-03-16 1:32 ` kernel test robot
2022-03-16 0:51 ` [PATCH 1/2] iommu/amd: Add support to indicate whether DMA remap support is enabled kernel test robot
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