diff options
| -rw-r--r-- | drivers/iommu/arm-smmu-v3.c | 13 | ||||
| -rw-r--r-- | drivers/iommu/of_iommu.c | 6 | ||||
| -rw-r--r-- | include/linux/iommu.h | 2 |
3 files changed, 20 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 4a9442f004ca..2717c2b211d2 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -289,6 +289,12 @@ #define CTXDESC_CD_1_TTB0_MASK GENMASK_ULL(51, 4) +/* + * When the SMMU only supports linear context descriptor tables, pick a + * reasonable size limit (64kB). + */ +#define CTXDESC_LINEAR_CDMAX ilog2(SZ_64K / (CTXDESC_CD_DWORDS << 3)) + /* Command queue */ #define CMDQ_ENT_SZ_SHIFT 4 #define CMDQ_ENT_DWORDS ((1 << CMDQ_ENT_SZ_SHIFT) >> 3) @@ -627,6 +633,7 @@ struct arm_smmu_master { u32 *sids; unsigned int num_sids; bool ats_enabled; + unsigned int ssid_bits; }; /* SMMU private data for an IOMMU domain */ @@ -2559,6 +2566,12 @@ static int arm_smmu_add_device(struct device *dev) } } + master->ssid_bits = min(smmu->ssid_bits, fwspec->num_pasid_bits); + + if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB)) + master->ssid_bits = min_t(u8, master->ssid_bits, + CTXDESC_LINEAR_CDMAX); + group = iommu_group_get_for_dev(dev); if (!IS_ERR(group)) { iommu_group_put(group); diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index e7bc8b721947..20738aacac89 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -203,8 +203,12 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, if (err) break; } - } + fwspec = dev_iommu_fwspec_get(dev); + if (!err && fwspec) + of_property_read_u32(master_np, "pasid-num-bits", + &fwspec->num_pasid_bits); + } /* * Two success conditions can be represented by non-negative err here: diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 90007c92ad2d..c1ad15228447 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -579,6 +579,7 @@ 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 * @iommu_priv: IOMMU driver private data for this device + * @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 */ @@ -587,6 +588,7 @@ struct iommu_fwspec { struct fwnode_handle *iommu_fwnode; void *iommu_priv; u32 flags; + u32 num_pasid_bits; unsigned int num_ids; u32 ids[1]; }; |