[PATCH v5 4/8] iommu/arm-smmu-v3: Introduce strtab init helper
From: Shameer Kolothum <hidden>
Date: 2021-05-24 17:42:11
Also in:
linux-acpi, linux-iommu
Subsystem:
arm smmu drivers, iommu subsystem, the rest · Maintainers:
Will Deacon, Joerg Roedel, Linus Torvalds
Introduce a helper to check the sid range and to init the l2 strtab entries(bypass). This will be useful when we have to initialize the l2 strtab with bypass for RMR SIDs. Signed-off-by: Shameer Kolothum <redacted> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 28 +++++++++++---------- 1 file changed, 15 insertions(+), 13 deletions(-)
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 54b2f27b81d4..754bad6092c1 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c@@ -2369,6 +2369,19 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid) return sid < limit; } +static int arm_smmu_init_sid_strtab(struct arm_smmu_device *smmu, u32 sid) +{ + /* Check the SIDs are in range of the SMMU and our stream table */ + if (!arm_smmu_sid_in_range(smmu, sid)) + return -ERANGE; + + /* Ensure l2 strtab is initialised */ + if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) + return arm_smmu_init_l2_strtab(smmu, sid); + + return 0; +} + static int arm_smmu_insert_master(struct arm_smmu_device *smmu, struct arm_smmu_master *master) {
@@ -2392,20 +2405,9 @@ static int arm_smmu_insert_master(struct arm_smmu_device *smmu, new_stream->id = sid; new_stream->master = master; - /* - * Check the SIDs are in range of the SMMU and our stream table - */ - if (!arm_smmu_sid_in_range(smmu, sid)) { - ret = -ERANGE; + ret = arm_smmu_init_sid_strtab(smmu, sid); + if (ret) break; - } - - /* Ensure l2 strtab is initialised */ - if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) { - ret = arm_smmu_init_l2_strtab(smmu, sid); - if (ret) - break; - } /* Insert into SID tree */ new_node = &(smmu->streams.rb_node);
--
2.17.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel