[PATCH v3 15/19] iommu/riscv: report iommu capabilities
Andrew Jones <[email protected]>
| Newsgroups | org.infradead.lists.linux-riscv,dev.linux.lists.iommu,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
From: Tomasz Jeznach <[email protected]> Report RISC-V IOMMU capability required by the VFIO subsystem to enable PCIe device assignment. Signed-off-by: Tomasz Jeznach <[email protected]> Signed-off-by: Andrew Jones <[email protected]> Reviewed-by: Nutty Liu <[email protected]> --- drivers/iommu/riscv/iommu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index f40db2cda417..a286f5a24c16 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -1424,6 +1424,17 @@ static struct iommu_group *riscv_iommu_device_group(struct device *dev) return generic_device_group(dev); } +static bool riscv_iommu_capable(struct device *dev, enum iommu_cap cap) +{ + switch (cap) { + case IOMMU_CAP_CACHE_COHERENCY: + /* The RISC-V IOMMU is always DMA cache coherent. */ + return true; + default: + return false; + } +} + static int riscv_iommu_of_xlate(struct device *dev, const struct of_phandle_args *args) { return iommu_fwspec_add_ids(dev, args->args, 1); @@ -1516,6 +1527,7 @@ static void riscv_iommu_get_resv_regions(struct device *dev, struct list_head *h static const struct iommu_ops riscv_iommu_ops = { .of_xlate = riscv_iommu_of_xlate, + .capable = riscv_iommu_capable, .identity_domain = &riscv_iommu_identity_domain, .blocked_domain = &riscv_iommu_blocking_domain, .release_domain = &riscv_iommu_blocking_domain, -- 2.43.0 _______________________________________________ linux-riscv mailing list [email protected] http://lists.infradead.org/mailman/listinfo/linux-riscv