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gpu: host1x: Return error when context device not attached to IOMMU

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If a context device was not attached to IOMMU, we kept the old
success err value causing context devices to be unregistered but
success to be returned. This would mean that things would go on
but with context isolation disabled.

To decide on an explicit behavior, let's return an error code
here instead. If someone wants to go without IOMMU on a platform
modern enough to support context isolation, they can remove the
context devices from device tree.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230413082202.114721-2-cyndis@kapsi.fi
(cherry picked from commit b02e6e040af7fa7fd59b0eb71d927dbc149bc20d)

Bug 4876974

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Change-Id: I09ce70f416e56a1a39ce31fb2485e6d28b568230
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3270635
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Mikko Perttunen
2023-04-13 11:22:02 +03:00
committed by Jon Hunter
parent 545c57385f
commit c0d1bdc684
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/host1x/context.c
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@@ -84,6 +84,14 @@ int host1x_memory_context_list_init(struct host1x *host1x)
if (!fwspec || !device_iommu_mapped(&ctx->dev)) {
dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i);
device_unregister(&ctx->dev);
/*
* This means that if IOMMU is disabled but context devices
* are defined in the device tree, Host1x will fail to probe.
* That's probably OK in this time and age.
*/
err = -EINVAL;
goto unreg_devices;
}