On Tue, Sep 13, 2016 at 04:15:31PM +0800, Hanjun Guo wrote:
[...]
> >>+static acpi_status __init iort_match_iommu_callback(struct
> >>acpi_iort_node *node,
> >>+ void *context)
> >>+{
> >>+ int ret;
> >>+ struct fwnode_handle *fwnode;
> >>+
> >>+ fwnode = iort_get_fwnode(node);
> >>+
> >>+ if (!fwnode)
> >>+ return AE_NOT_FOUND;
> >>+
> >>+ ret = iort_add_smmu_platform_device(fwnode, node);
> >>+ if (ret) {
> >>+ pr_err("Error in platform device creation\n");
> >>+ return AE_ERROR;
> >>+ }
> >>+
> >>+ return AE_OK;
> >>+}
> >>+
> >>+static void __init iort_smmu_init(void)
> >>+{
> >>+ iort_scan_node(ACPI_IORT_NODE_SMMU, iort_match_iommu_callback,
> >>NULL);
> >>+ iort_scan_node(ACPI_IORT_NODE_SMMU_V3, iort_match_iommu_callback,
> >>NULL);
> >
> >Since iort_scan_node() returns after the first successful match it finds,
> >only the first SMMU_V3 in my IORT is being enumerated. I think you need
> >to go back to the "iterator" like approach you had been using or make
> >iort_match_iommu_callback() always return a non-AE_OK value so the scan
> >continues and has a chance to visit all of the SMMU_V3 nodes.
>
> Please use the updated version of IORT patch (aka Tomasz's v11)
> then things will work fine.
Nate is right, I was too keen on using iort_scan_node(), it does
not really work here (unless as he said I return a value !AE_OK in
the callback, which is horrible), I reverted back to the iterator
approach and I can push out a fixed up branch if useful before next
posting.
Thanks,
Lorenzo
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