Re: [PATCH v5 5/9] iommu/arm-smmu: Attach to host1x context device bus

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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.



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