[PATCH v3 16/20] iommu/gart: Add set_platform_dma callback

Lu Baolu
2022-11-28T06:56:56Z

This IOMMU driver doesn't support default domain. Add the implementation
of set_platform_dma callback so that the IOMMU core could return the
DMA control.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
drivers/iommu/tegra-gart.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index ed53279d1106..f56e40b5c47a 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -141,6 +141,14 @@ static void gart_iommu_detach_dev(struct iommu_domain *domain,
spin_unlock(&gart->dom_lock);
}

+static void gart_iommu_set_platform_dma(struct device *dev)
+{
+ struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+
+ if (domain)
+ gart_iommu_detach_dev(domain, dev);
+}
+
static struct iommu_domain *gart_iommu_domain_alloc(unsigned type)
{
struct iommu_domain *domain;
@@ -270,6 +278,7 @@ static const struct iommu_ops gart_iommu_ops = {
.domain_alloc = gart_iommu_domain_alloc,
.probe_device = gart_iommu_probe_device,
.device_group = generic_device_group,
+ .set_platform_dma = gart_iommu_set_platform_dma,
.pgsize_bitmap = GART_IOMMU_PGSIZES,
.of_xlate = gart_iommu_of_xlate,
.default_domain_ops = &(const struct iommu_domain_ops) {
--
2.34.1