Hi Dmitry,
On 08/05/18 19:16, Dmitry Osipenko wrote:
GART can't handle all devices, ignore devices that aren't related to GART.
Device tree must explicitly assign GART IOMMU to the devices.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/iommu/tegra-gart.c | 33 ++++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 39305224c48d..5b2d27620350 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -366,6 +366,26 @@ static void gart_iommu_remove_device(struct device *dev)
iommu_device_unlink(&gart_handle->iommu, dev);
}
+static int gart_iommu_check_device(struct gart_device *gart,
+ struct device *dev);
+
+struct iommu_group *gart_iommu_device_group(struct device *dev)
+{
+ int err;
+
+ err = gart_iommu_check_device(gart_handle, dev);
+ if (err)
+ return ERR_PTR(err);
+
+ return generic_device_group(dev);
+}
+
+static int gart_iommu_of_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ return 0;
+}
+
static const struct iommu_ops gart_iommu_ops = {
.capable = gart_iommu_capable,
.domain_alloc = gart_iommu_domain_alloc,
@@ -374,14 +394,24 @@ static const struct iommu_ops gart_iommu_ops = {
.detach_dev = gart_iommu_detach_dev,
.add_device = gart_iommu_add_device,
.remove_device = gart_iommu_remove_device,
- .device_group = generic_device_group,
+ .device_group = gart_iommu_device_group,
.map = gart_iommu_map,
.map_sg = default_iommu_map_sg,
.unmap = gart_iommu_unmap,
.iova_to_phys = gart_iommu_iova_to_phys,
.pgsize_bitmap = GART_IOMMU_PGSIZES,
+ .of_xlate = gart_iommu_of_xlate,
};
+static int gart_iommu_check_device(struct gart_device *gart,
+ struct device *dev)
+{
+ if (!dev->iommu_fwspec || dev->iommu_fwspec->ops != &gart_iommu_ops)
+ return -ENODEV;
Conceptually, it would be better to verify this in .add_device *before*
calling iommu_group_get_for_dev(). That would also align with what other
drivers do, and let you save introducing the .device_group callback
until the real implementation in the later patch.
Robin.
+
+ return 0;
+}
+
static int tegra_gart_suspend(struct device *dev)
{
struct gart_device *gart = dev_get_drvdata(dev);
@@ -462,6 +492,7 @@ static int tegra_gart_probe(struct platform_device *pdev)
}
iommu_device_set_ops(&gart->iommu, &gart_iommu_ops);
+ iommu_device_set_fwnode(&gart->iommu, dev->fwnode);
ret = iommu_device_register(&gart->iommu);
if (ret) {
--
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