diff options
| author | Jean-Philippe Brucker <jean-philippe@linaro.org> | 2024-06-07 11:54:15 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-07-04 14:54:01 +0100 |
| commit | 86e02a88bedc1072beb5445d408e379674b0b7f3 (patch) | |
| tree | ee33d1bca3de7565608cade753bf2b1add4e9106 | |
| parent | 40929e8e5449a18bc98baf7a907dd6674bd60049 (diff) | |
iommu/of: Support ats-supported device-tree property
Device-tree declares whether a PCI root-complex supports ATS by setting
the "ats-supported" property. Copy this flag into device fwspec to let
IOMMU drivers quickly check if they can enable ATS for a device.
Tested-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Link: https://lore.kernel.org/r/20240607105415.2501934-4-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | drivers/iommu/of_iommu.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index 3afe0b48a48d..082b94c2b329 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -105,6 +105,14 @@ static int of_iommu_configure_device(struct device_node *master_np, of_iommu_configure_dev(master_np, dev); } +static void of_pci_check_device_ats(struct device *dev, struct device_node *np) +{ + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); + + if (fwspec && of_property_read_bool(np, "ats-supported")) + fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS; +} + /* * Returns: * 0 on success, an iommu was configured @@ -147,6 +155,7 @@ int of_iommu_configure(struct device *dev, struct device_node *master_np, pci_request_acs(); err = pci_for_each_dma_alias(to_pci_dev(dev), of_pci_iommu_init, &info); + of_pci_check_device_ats(dev, master_np); } else { err = of_iommu_configure_device(master_np, dev, id); } |