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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Yicong Yang <yangyicong@hisilicon.com>,
	Will Deacon <will@kernel.org>, John Garry <john.garry@huawei.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Sasha Levin <sashal@kernel.org>,
	joro@8bytes.org, robin.murphy@arm.com, baolu.lu@linux.intel.com,
	jgg@ziepe.ca, tglx@linutronix.de,
	shameerali.kolothum.thodi@huawei.com,
	christophe.jaillet@wanadoo.fr,
	linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev
Subject: [PATCH AUTOSEL 5.15 10/47] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity
Date: Wed, 12 Oct 2022 20:20:45 -0400	[thread overview]
Message-ID: <20221013002124.1894077-10-sashal@kernel.org> (raw)
In-Reply-To: <20221013002124.1894077-1-sashal@kernel.org>

From: Yicong Yang <yangyicong@hisilicon.com>

[ Upstream commit 24b6c7798a0122012ca848ea0d25e973334266b0 ]

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.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20220816114414.4092-2-yangyicong@huawei.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

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 79edfdca6607..e7da4a47ce52 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2832,6 +2832,26 @@ static int arm_smmu_dev_disable_feature(struct device *dev,
 	}
 }
 
+/*
+ * HiSilicon PCIe tune and trace device can be used to trace TLP headers on the
+ * PCIe link and save the data to memory by DMA. The hardware is restricted to
+ * use identity mapping only.
+ */
+#define IS_HISI_PTT_DEVICE(pdev)	((pdev)->vendor == PCI_VENDOR_ID_HUAWEI && \
+					 (pdev)->device == 0xa12e)
+
+static int arm_smmu_def_domain_type(struct device *dev)
+{
+	if (dev_is_pci(dev)) {
+		struct pci_dev *pdev = to_pci_dev(dev);
+
+		if (IS_HISI_PTT_DEVICE(pdev))
+			return IOMMU_DOMAIN_IDENTITY;
+	}
+
+	return 0;
+}
+
 static struct iommu_ops arm_smmu_ops = {
 	.capable		= arm_smmu_capable,
 	.domain_alloc		= arm_smmu_domain_alloc,
@@ -2857,6 +2877,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.sva_unbind		= arm_smmu_sva_unbind,
 	.sva_get_pasid		= arm_smmu_sva_get_pasid,
 	.page_response		= arm_smmu_page_response,
+	.def_domain_type	= arm_smmu_def_domain_type,
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
 	.owner			= THIS_MODULE,
 };
-- 
2.35.1


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  parent reply	other threads:[~2022-10-13  0:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-13  0:20 [PATCH AUTOSEL 5.15 01/47] clk: zynqmp: Fix stack-out-of-bounds in strncpy` Sasha Levin
2022-10-13  0:20 ` [PATCH AUTOSEL 5.15 03/47] media: platform: fix some double free in meson-ge2d and mtk-jpeg and s5p-mfc Sasha Levin
2022-10-13  0:20 ` [PATCH AUTOSEL 5.15 04/47] clk: zynqmp: pll: rectify rate rounding in zynqmp_pll_round_rate Sasha Levin
2022-10-13  0:20 ` Sasha Levin [this message]
2022-10-13  7:07   ` [PATCH AUTOSEL 5.15 10/47] iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity John Garry
2022-10-16 13:30     ` Sasha Levin
2022-10-13  0:21 ` [PATCH AUTOSEL 5.15 31/47] arm64: dts: imx8mp: Add snps,gfladj-refclk-lpm-sel quirk to USB nodes Sasha Levin
2022-10-13  5:57   ` [PATCH AUTOSEL 5.15 31/47] arm64: dts: imx8mp: Add snps, gfladj-refclk-lpm-sel " Alexander Stein
2022-10-13  0:21 ` [PATCH AUTOSEL 5.15 46/47] clk: bcm2835: Make peripheral PLLC critical Sasha Levin
2022-10-13  0:21 ` [PATCH AUTOSEL 5.15 47/47] clk: bcm2835: Round UART input clock up Sasha Levin

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