diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2017-03-31 11:03:33 (GMT) |
|---|---|---|
| committer | Xie Xiaobo <xiaobo.xie@nxp.com> | 2017-09-25 07:25:43 (GMT) |
| commit | 0cf421c828c93e8088ed02d6b3dd3d869d34dd8a (patch) | |
| tree | acb542cc5ad2b5e9b0d78e275749565a3ccf9e77 /drivers/iommu | |
| parent | 190874f8d2ccfd4b8ae9d9387abc8180f0072556 (diff) | |
| download | linux-0cf421c828c93e8088ed02d6b3dd3d869d34dd8a.tar.xz | |
iommu/arm-smmu: Add global SMR masking property
The current SMR masking support using a 2-cell iommu-specifier is
primarily intended to handle individual masters with large and/or
complex Stream ID assignments; it quickly gets a bit clunky in other SMR
use-cases where we just want to consistently mask out the same part of
every Stream ID (e.g. for MMU-500 configurations where the appended TBU
number gets in the way unnecessarily). Let's add a new property to allow
a single global mask value to better fit the latter situation.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Nipun Gupta <nipun.gupta@nxp.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 35335f8..db6126b 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -1541,13 +1541,15 @@ out_unlock: static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args) { - u32 fwid = 0; + u32 mask, fwid = 0; if (args->args_count > 0) fwid |= (u16)args->args[0]; if (args->args_count > 1) fwid |= (u16)args->args[1] << SMR_MASK_SHIFT; + else if (!of_property_read_u32(args->np, "stream-match-mask", &mask)) + fwid |= (u16)mask << SMR_MASK_SHIFT; return iommu_fwspec_add_ids(dev, &fwid, 1); } |