On 2022-05-16 11:13, Mikko Perttunen wrote:
On 5/16/22 13:07, Will Deacon wrote:
On Mon, May 16, 2022 at 11:52:54AM +0300, cyndis@xxxxxxxx wrote:
From: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Set itself as the IOMMU for the host1x context device bus, containing
"dummy" devices used for Host1x context isolation.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
drivers/iommu/arm/arm-smmu/arm-smmu.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c
b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 568cce590ccc..9ff54eaecf81 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -39,6 +39,7 @@
#include <linux/amba/bus.h>
#include <linux/fsl/mc.h>
+#include <linux/host1x_context_bus.h>
#include "arm-smmu.h"
@@ -2053,8 +2054,20 @@ static int arm_smmu_bus_init(struct iommu_ops
*ops)
goto err_reset_pci_ops;
}
#endif
+#ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
+ if (!iommu_present(&host1x_context_device_bus_type)) {
+ err = bus_set_iommu(&host1x_context_device_bus_type, ops);
+ if (err)
+ goto err_reset_fsl_mc_ops;
+ }
+#endif
+
return 0;
+err_reset_fsl_mc_ops: __maybe_unused;
+#ifdef CONFIG_FSL_MC_BUS
+ bus_set_iommu(&fsl_mc_bus_type, NULL);
+#endif
bus_set_iommu() is going away:
https://lore.kernel.org/r/cover.1650890638.git.robin.murphy@xxxxxxx
Will
Thanks for the heads-up. Robin had pointed out that this work was
ongoing but I hadn't seen the patches yet. I'll look into it.
Although that *is* currently blocked on the mystery intel-iommu problem
that I can't reproduce... If this series is ready to land right now for
5.19 then in principle that might be the easiest option overall.
Hopefully at least patch #2 could sneak in so that the compile-time
dependencies are ready for me to roll up host1x into the next rebase of
"iommu: Always register bus notifiers".
Cheers,
Robin.
