From: Robin Murphy <robin.murphy@arm.com>
To: Baolu Lu <baolu.lu@linux.intel.com>, Jason Gunthorpe <jgg@nvidia.com>
Cc: Joerg Roedel <joro@8bytes.org>,
Christoph Hellwig <hch@infradead.org>,
Kevin Tian <kevin.tian@intel.com>, Will Deacon <will@kernel.org>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>,
Rob Clark <robdclark@gmail.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Yong Wu <yong.wu@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Heiko Stuebner <heiko@sntech.de>,
Matthew Rosato <mjrosato@linux.ibm.com>,
Orson Zhai <orsonzhai@gmail.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Chunyan Zhang <zhang.lyra@gmail.com>,
Chen-Yu Tsai <wens@csie.org>,
Thierry Reding <thierry.reding@gmail.com>,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 06/20] iommu/mtk: Remove detach_dev callback
Date: Tue, 29 Nov 2022 11:45:45 +0000 [thread overview]
Message-ID: <f9d005e2-9fc6-bbf4-53fb-95f18201ce2d@arm.com> (raw)
In-Reply-To: <4a979bdc-d7b4-77b4-490a-5f3e691e3df3@linux.intel.com>
On 2022-11-29 02:07, Baolu Lu wrote:
> On 11/28/22 9:59 PM, Robin Murphy wrote:
>> On 2022-11-28 13:49, Jason Gunthorpe wrote:
>>> On Mon, Nov 28, 2022 at 02:46:34PM +0800, Lu Baolu wrote:
>>>> The IOMMU driver supports default domain, so the detach_dev op will
>>>> never
>>>> be called. Remove it to avoid dead code.
>>>>
>>>> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
>>>> ---
>>>> drivers/iommu/mtk_iommu.c | 9 ---------
>>>> 1 file changed, 9 deletions(-)
>>>
>>> I listed this driver as not supporting default domains:
>>>
>>> https://lore.kernel.org/linux-iommu/20220516135741.GV1343366@nvidia.com/
>>>
>>> ?
>>>
>>> Has something changed? Did I get it wrong?
>>
>> static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
>> {
>> struct mtk_iommu_domain *dom;
>>
>> if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED)
>> return NULL;
>> ...
>>
>>
>> This one runs on arm64, so has always supported default domains for
>> iommu-dma to work.
>
> This, together with several other ones, only support IOMMU_DOMAIN_DMA
> type of default domain. The iommu core handle this by falling back to
> IOMMU_DOMAIN_DMA if other types fail.
>
> dom = __iommu_domain_alloc(bus, type);
> if (!dom && type != IOMMU_DOMAIN_DMA) {
> dom = __iommu_domain_alloc(bus, IOMMU_DOMAIN_DMA);
> if (dom)
> pr_warn("Failed to allocate default IOMMU
> domain of type %u for group %s - Falling back to IOMMU_DOMAIN_DMA",
> type, group->name);
> }
>
> I have another cleanup series:
>
> https://github.com/LuBaolu/intel-iommu/commits/iommu-use-def_default_type-wip
>
> which adds IOMMU_DOMAIN_DMA default domain type requirement in the
> def_domain_type callback. I planed to bring that to discussion after
> this one.
Per the discussion over on the s390 thread, I think that would be a step
in the wrong direction. I'd prefer to keep .def_domain_type for
device-specific requirements and express general driver domain support a
different way. If the IOMMU_DOMAIN_DMA fallback is worth removing then
the one for IOMMU_DOMAIN_BLOCKED is as well - no point doing half the job ;)
Thanks,
Robin.
next prev parent reply other threads:[~2022-11-29 11:45 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-28 6:46 [PATCH v3 00/20] iommu: Retire detach_dev callback Lu Baolu
2022-11-28 6:46 ` [PATCH v3 01/20] iommu/amd: Remove " Lu Baolu
2022-11-28 13:42 ` Jason Gunthorpe
2022-11-28 6:46 ` [PATCH v3 02/20] iommu/apple-dart: " Lu Baolu
2022-11-28 13:43 ` Jason Gunthorpe
2022-11-30 17:00 ` Sven Peter
2022-12-01 4:50 ` Baolu Lu
2022-11-28 6:46 ` [PATCH v3 03/20] iommu/qcom: " Lu Baolu
2022-11-28 13:43 ` Jason Gunthorpe
2022-11-28 6:46 ` [PATCH v3 04/20] iommu/exynos: " Lu Baolu
2022-11-28 13:44 ` Jason Gunthorpe
2022-11-28 6:46 ` [PATCH v3 05/20] iommu/ipmmu: " Lu Baolu
2022-11-28 13:44 ` Jason Gunthorpe
2022-11-28 6:46 ` [PATCH v3 06/20] iommu/mtk: " Lu Baolu
2022-11-28 13:49 ` Jason Gunthorpe
2022-11-28 13:59 ` Robin Murphy
2022-11-29 2:07 ` Baolu Lu
2022-11-29 11:45 ` Robin Murphy [this message]
2022-11-29 11:58 ` Baolu Lu
2022-11-28 6:46 ` [PATCH v3 07/20] iommu/rockchip: " Lu Baolu
2022-11-28 13:53 ` Jason Gunthorpe
2022-11-28 6:46 ` [PATCH v3 08/20] iommu/sprd: " Lu Baolu
2022-11-28 13:53 ` Jason Gunthorpe
2022-11-29 3:34 ` Tian, Kevin
2022-11-30 9:02 ` Chunyan Zhang
2022-11-30 9:03 ` Chunyan Zhang
2022-11-28 6:46 ` [PATCH v3 09/20] iommu/sun50i: " Lu Baolu
2022-11-28 14:09 ` Jason Gunthorpe
2022-11-28 6:46 ` [PATCH v3 10/20] iommu: Add set_platform_dma iommu ops Lu Baolu
2022-11-28 14:11 ` Jason Gunthorpe
2022-11-29 2:15 ` Baolu Lu
2022-11-28 6:46 ` [PATCH v3 11/20] iommu/fsl_pamu: Add set_platform_dma callback Lu Baolu
2022-11-28 14:14 ` Jason Gunthorpe
2022-11-29 3:46 ` Baolu Lu
2022-11-28 6:46 ` [PATCH v3 12/20] iommu/msm: " Lu Baolu
2022-11-28 6:46 ` [PATCH v3 13/20] iommu/mtk_v1: " Lu Baolu
2022-11-28 6:46 ` [PATCH v3 14/20] iommu/omap: " Lu Baolu
2022-11-28 6:46 ` [PATCH v3 15/20] iommu/s390: " Lu Baolu
2022-11-28 6:46 ` [PATCH v3 16/20] iommu/gart: " Lu Baolu
2022-11-28 6:46 ` [PATCH v3 17/20] iommu/tegra: " Lu Baolu
2022-11-28 6:46 ` [PATCH v3 18/20] iommu: Call set_platform_dma if default domain is unavailable Lu Baolu
2022-11-28 14:57 ` Jason Gunthorpe
2023-01-03 2:45 ` Baolu Lu
2023-01-03 14:25 ` Jason Gunthorpe
2022-11-28 6:46 ` [PATCH v3 19/20] iommu: Retire detach_dev callback Lu Baolu
2022-11-28 6:46 ` [PATCH v3 20/20] iommu: Rename attach_dev to set_dev Lu Baolu
2022-11-28 13:41 ` Robin Murphy
2022-11-28 15:00 ` Jason Gunthorpe
2022-11-28 15:53 ` Robin Murphy
2022-11-29 3:59 ` Tian, Kevin
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