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iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to identity

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[ Upstream commit 24b6c7798a ]

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>
This commit is contained in:
Yicong Yang 2022-08-16 19:44:10 +08:00 committed by Greg Kroah-Hartman
parent 62006a72b0
commit 78e83cfc64
1 changed files with 21 additions and 0 deletions
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21
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@ -2839,6 +2839,26 @@ 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,
@ -2856,6 +2876,7 @@ 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,
.default_domain_ops = &(const struct iommu_domain_ops) {