On 09/03/17 09:52, sricharan wrote:
> Hi Robin,
>
>> On 08/03/17 18:58, Jean-Philippe Brucker wrote:
>> [...]
>>>> static const struct iommu_ops
>>>> -*of_pci_iommu_configure(struct pci_dev *pdev, struct device_node
>>>> *bridge_np)
>>>> +*of_pci_iommu_init(struct pci_dev *pdev, struct device_node
>>>> +*bridge_np)
>>>> {
>>>> const struct iommu_ops *ops;
>>>> struct of_phandle_args iommu_spec;
>>>> + int err;
>>>>
>>>> /*
>>>> * Start by tracing the RID alias down the PCI topology as @@
>>>> -123,56 +146,56 @@ static int __get_pci_rid(struct pci_dev *pdev, u16
>> alias, void *data)
>>>> * bus into the system beyond, and which IOMMU it ends up at.
>>>> */
>>>> iommu_spec.np = NULL;
>>>> - if (of_pci_map_rid(bridge_np, iommu_spec.args[0], "iommu-map",
>>>> - "iommu-map-mask", &iommu_spec.np,
>> iommu_spec.args))
>>>> - return NULL;
>>>> + err = of_pci_map_rid(bridge_np, iommu_spec.args[0], "iommu-map",
>>>> + "iommu-map-mask", &iommu_spec.np,
>>>> + iommu_spec.args);
>>>> + if (err)
>>>> + return ERR_PTR(err);
>>>
>>> This change doesn't work with of_pci_map_rid when the PCI RC isn't
>>> behind an IOMMU:
>>>
>>> map = of_get_property(np, map_name, &map_len);
>>> if (!map) {
>>> if (target)
>>> return -ENODEV;
>>> /* Otherwise, no map implies no translation */
>>> *id_out = rid;
>>> return 0;
>>> }
>>>
>>> Previously with no iommu-map, we returned -ENODEV but it was discarded
>>> by of_pci_iommu_configure. Now it is propagated and the whole device
>>> probing fails. Instead, maybe of_pci_map_rid should always return 0 if
>>> no iommu-map, and the caller should check if *target is still NULL?
>>
>> Ah yes, Tomasz had found breakages with the "mmu-masters" binding
>> before, and I'd already pushed out a fixup for this one[1], but I forgot
> that
>> that discussion was all off-list (out of diplomatic concern that the
> breakage
>> might have been intentional - it wasn't, honest!)
>>
>> Now that rc1 is out I should re-do that branch with v8 of this series plus
> the
>> fixups folded in, unless Sricharan beats me to it.
>>
>
> Right, I had this one [1] as V9 which had all your fixes that we discussed
> offline as
> well. I was about to post a V9 today on top of -rc1 today as well.
>
> [1] https://github.com/sricharanaz/iommu/tree/pd_v9
Awesome, I'll try to get on with testing that ASAP. Thanks!
Robin.
>
> Regards,
> Sricharan
>
>
>> Thanks for the reminder,
>> Robin.
>>
>> [1]:http://www.linux-arm.org/git?p=linux-
>> rm.git;a=commitdiff;h=0049a34e523506813995c05766f5e2c16d616354
>>
>>>
>>> Thanks,
>>> Jean-Philippe
>>
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