Re: [PATCH v6 05/14] ACPI: platform-msi: retrieve dev id from IORT

[Hanjun Guo]

On 01/10/2017 10:57 PM, Lorenzo Pieralisi wrote:
> On Tue, Jan 10, 2017 at 09:39:39PM +0800, Hanjun Guo wrote:
>
> [...]
>
> > > What you can do is create a wrapper, say iort_node_map_platform_id()
> > > (whose signature is equivalent to iort_node_map_rid() minus rid_in)
> > > that carries out the two steps outlined above.
> > >
> > > To do that I suggest the following:
> > >
> > > (1) I send a patch to "fix" iort_node_get_id() (ie index issue you
> > >     reported)
> >
> > I prepared two simple patches, one is for fix the indentation and
> > the other is adding the missing kernel-doc comment, how about
> > sending the out for 4.10-rcx?
>
> For me it is fine depending on how Rafael wants to handle them,
> ie if he can batch those with the eg iort_node_get_id() fix I have
> just sent:
>
> https://patchwork.kernel.org/patch/9507041/
>
> > > (2) We remove type_mask handling from iort_node_get_id()
> >
> > iort_node_get_id() for now only supports id single mappings,
> > Do we need to extend it for multi id mappings? seems Sinan's
> > platform have such cases.
>
> I am not really sure I understand what you mean here.

Sorry for not clear, I was thinking if we want to support
ID mapping entries with multi IDs like BDFs for RC,

> > > (3) We create iort_node_map_platform_id() that (pseudo-code, I can
> > >     write the patch if it is clearer):
> > >
> > > struct acpi_iort_node *iort_node_map_platform_id(u8 type_mask, int index,
> > > 						 ...)
> > > {
> > > 	u32 id, id_out;
> > > 	struct acpi_iort_node *parent = iort_node_get_id(&id, index);
> > >
> > > 	if (!parent)
> > > 		return NULL;
> > >
> > > 	/* we should probably rename iort_node_map_rid() too */
> > > 	if (!(IORT_TYPE_MASK(parent->type) & type_mask)
> > > 		parent = iort_node_map_rid(parent, id, &id_out, type_mask);
> > >
> > > 	return parent;
> > > }
> > >
> > > (4) we update current iort_node_get_id() users and move them over
> > >     to iort_node_map_platform_id()
> >
> > I think we need to prepare one patch for the above steps, or it
> > have functional changes for iort_node_get_id(), for example we
> > removed the type_mask handling from iort_node_get_id() and it
> > will break the case for SMMU if we only have requester id entries.
>
> If the question is "should we apply this change as a single logical
> patch" the answer is yes, it looks a simple one to me (basically
> it implies writing the function above and update the iort_node_get_id()
> existing callers with it). Does this answer your question ?

Yes, thank you for your patience :)

When I was preparing patches, I split them into three patches, hope it
makes the review easier, will send out the patch set soon.

Thanks
Hanjun