From: Will Deacon <will@kernel.org>
To: Yicong Yang <yangyicong@hisilicon.com>
Cc: gregkh@linuxfoundation.org, helgaas@kernel.org,
alexander.shishkin@linux.intel.com, lorenzo.pieralisi@arm.com,
mark.rutland@arm.com, mathieu.poirier@linaro.org,
suzuki.poulose@arm.com, mike.leach@linaro.org,
leo.yan@linaro.org, jonathan.cameron@huawei.com,
daniel.thompson@linaro.org, joro@8bytes.org,
john.garry@huawei.com, shameerali.kolothum.thodi@huawei.com,
robin.murphy@arm.com, peterz@infradead.org, mingo@redhat.com,
acme@kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
linux-pci@vger.kernel.org, linux-perf-users@vger.kernel.org,
iommu@lists.linux-foundation.org, prime.zeng@huawei.com,
liuqi115@huawei.com, zhangshaokun@hisilicon.com,
linuxarm@huawei.com
Subject: Re: [PATCH v7 1/7] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity
Date: Tue, 10 May 2022 12:23:27 +0100 [thread overview]
Message-ID: <20220510112326.GA27790@willie-the-truck> (raw)
In-Reply-To: <20220407125841.3678-2-yangyicong@hisilicon.com>
On Thu, Apr 07, 2022 at 08:58:35PM +0800, Yicong Yang wrote:
> The DMA operations of HiSilicon PTT device can only work properly with
> identical mappings. So add a quirk for the device to force the domain
> as passthrough.
>
> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
I still don't like this being part of the SMMU driver, but given that
(a) Robin doesn't seem to agree with the objection and (b) you've been
refreshing the patch series:
Acked-by: Will Deacon <will@kernel.org>
If you do respin, then:
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 627a3ed5ee8f..5ec15ae2a9b1 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2839,6 +2839,21 @@ static int arm_smmu_dev_disable_feature(struct device *dev,
> }
> }
It might be worth adding a brief comment here to explain what this device is
and why it needs an identity mapping.
> +#define IS_HISI_PTT_DEVICE(pdev) ((pdev)->vendor == PCI_VENDOR_ID_HUAWEI && \
> + (pdev)->device == 0xa12e)
Will
next prev parent reply other threads:[~2022-05-10 11:23 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-07 12:58 [PATCH v7 0/7] Add support for HiSilicon PCIe Tune and Trace device Yicong Yang
2022-04-07 12:58 ` [PATCH v7 1/7] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity Yicong Yang
2022-05-10 11:23 ` Will Deacon [this message]
2022-05-10 12:43 ` Yicong Yang
2022-05-11 11:42 ` John Garry
2022-04-07 12:58 ` [PATCH v7 2/7] hwtracing: Add trace function support for HiSilicon PCIe Tune and Trace device Yicong Yang
2022-04-11 17:02 ` John Garry
2022-04-12 7:36 ` Yicong Yang
2022-04-12 8:39 ` John Garry
2022-04-12 12:52 ` Yicong Yang
2022-04-29 16:00 ` Leo Yan
2022-05-05 12:13 ` Yicong Yang
2022-05-10 9:46 ` James Clark
2022-05-10 11:18 ` Yicong Yang
2022-05-10 12:54 ` James Clark
2022-05-10 13:17 ` Yicong Yang
2022-04-07 12:58 ` [PATCH v7 3/7] hisi_ptt: Add support for dynamically updating the filter list Yicong Yang
2022-04-07 12:58 ` [PATCH v7 4/7] hisi_ptt: Add tune function support for HiSilicon PCIe Tune and Trace device Yicong Yang
2022-04-07 12:58 ` [PATCH v7 5/7] perf tool: Add support for HiSilicon PCIe Tune and Trace device driver Yicong Yang
2022-04-11 17:19 ` John Garry
2022-04-12 7:41 ` Yicong Yang
2022-04-14 13:00 ` John Garry
2022-04-30 7:35 ` Leo Yan
2022-05-05 11:30 ` liuqi (BA)
2022-05-10 10:14 ` James Clark
2022-05-11 2:02 ` liuqi (BA)
2022-05-11 9:18 ` James Clark
2022-04-07 12:58 ` [PATCH v7 6/7] docs: Add HiSilicon PTT device driver documentation Yicong Yang
2022-04-07 12:58 ` [PATCH v7 7/7] MAINTAINERS: Add maintainer for HiSilicon PTT driver Yicong Yang
2022-04-14 13:20 ` [PATCH v7 0/7] Add support for HiSilicon PCIe Tune and Trace device Yicong Yang
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