Re: [PATCH v12 02/10] iommu/arm-smmu-v3: Use device properties for pasid-num-bits
From: Auger Eric <eric.auger@redhat.com>
Date: 2021-02-01 07:32:21
Also in:
linux-acpi, linux-devicetree, linux-iommu
Hi, On 1/27/21 4:43 PM, Jean-Philippe Brucker wrote:
The pasid-num-bits property shouldn't need a dedicated fwspec field, it's a job for device properties. Add properties for IORT, and access the number of PASID bits using device_property_read_u32(). Suggested-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Jean-Philippe Brucker <redacted>
Reviewed-by: Eric Auger <eric.auger@redhat.com> Eric
quoted hunk ↗ jump to hunk
--- include/linux/iommu.h | 2 -- drivers/acpi/arm64/iort.c | 13 +++++++------ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 ++- drivers/iommu/of_iommu.c | 5 ----- 4 files changed, 9 insertions(+), 14 deletions(-)diff --git a/include/linux/iommu.h b/include/linux/iommu.h index bdf3f34a4457..b7ea11fc1a93 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h@@ -571,7 +571,6 @@ struct iommu_group *fsl_mc_device_group(struct device *dev); * @ops: ops for this device's IOMMU * @iommu_fwnode: firmware handle for this device's IOMMU * @flags: IOMMU_FWSPEC_* flags - * @num_pasid_bits: number of PASID bits supported by this device * @num_ids: number of associated device IDs * @ids: IDs which this device may present to the IOMMU */@@ -579,7 +578,6 @@ struct iommu_fwspec { const struct iommu_ops *ops; struct fwnode_handle *iommu_fwnode; u32 flags; - u32 num_pasid_bits; unsigned int num_ids; u32 ids[]; };diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index d4eac6d7e9fb..c9a8bbb74b09 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c@@ -968,15 +968,16 @@ static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) static void iort_named_component_init(struct device *dev, struct acpi_iort_node *node) { + struct property_entry props[2] = {}; struct acpi_iort_named_component *nc; - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - - if (!fwspec) - return; nc = (struct acpi_iort_named_component *)node->node_data; - fwspec->num_pasid_bits = FIELD_GET(ACPI_IORT_NC_PASID_BITS, - nc->node_flags); + props[0] = PROPERTY_ENTRY_U32("pasid-num-bits", + FIELD_GET(ACPI_IORT_NC_PASID_BITS, + nc->node_flags)); + + if (device_add_properties(dev, props)) + dev_warn(dev, "Could not add device properties\n"); } static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node)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 baebaac34a83..88dd9feb32f4 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c@@ -2392,7 +2392,8 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) } } - master->ssid_bits = min(smmu->ssid_bits, fwspec->num_pasid_bits); + device_property_read_u32(dev, "pasid-num-bits", &master->ssid_bits); + master->ssid_bits = min(smmu->ssid_bits, master->ssid_bits); /* * Note that PASID must be enabled before, and disabled after ATS:diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index e505b9130a1c..a9d2df001149 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c@@ -210,11 +210,6 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, of_pci_iommu_init, &info); } else { err = of_iommu_configure_device(master_np, dev, id); - - fwspec = dev_iommu_fwspec_get(dev); - if (!err && fwspec) - of_property_read_u32(master_np, "pasid-num-bits", - &fwspec->num_pasid_bits); } /*
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