[PATCH v7 3/4] gicv2m: Refactor to prepare for ACPI support
suravee.suthikulpanit at amd.com
Tue Dec 22 15:04:15 PST 2015
On 12/17/2015 10:57 AM, Bjorn Helgaas wrote:
> On Wed, Dec 16, 2015 at 06:23:49PM -0600, Suravee Suthikulanit wrote:
>> Hi Bjorn,
>> Thanks for your review. Please see my comments below.
>> On 12/16/2015 4:12 PM, Bjorn Helgaas wrote:
>>> On Thu, Dec 10, 2015 at 08:55:29AM -0800, Suravee Suthikulpanit wrote:
>>>> This patch replaces the struct device_node with struct fwnode_handle
>>>> since this structure is common between DT and ACPI.
>>>> It also refactors gicv2m_init_one() to prepare for ACPI support.
>>>> The only functional change is removing the node name from pr_info.
>>>> Reviewed-by: Marc Zyngier <marc.zyngier at arm.com>
>>>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit at amd.com>
>>>> @@ -359,10 +355,10 @@ static int __init gicv2m_init_one(struct device_node *node,
>>>> list_add_tail(&v2m->entry, &v2m_nodes);
>>>> - pr_info("Node %s: range[%#lx:%#lx], SPI[%d:%d]\n", node->name,
>>>> - (unsigned long)v2m->res.start, (unsigned long)v2m->res.end,
>>>> - v2m->spi_start, (v2m->spi_start + v2m->nr_spis));
>>>> + pr_info("range[%#lx:%#lx], SPI[%d:%d]\n",
>>>> + (unsigned long)res->start, (unsigned long)res->end,
>>>> + v2m->spi_start, (v2m->spi_start + v2m->nr_spis));
>>> You didn't change this, but I don't think this message has enough
>>> context. It's pretty cryptic all by itself. It'd be nice if it could
>>> at least include a device name, e.g., if you could use dev_info().
>> Here is the example of the information printed:
>> [ 0.000000] GICv2m: range[0xe1180000:0xe1181000], SPI[64:320]
>> Basically, the v2m is just an extension of the GIC. Here, we are
>> printing the memory range that it is covering, which can be used to
>> identify different V2m frame and the associate interrupt range
>> (SPI). The node name is not really providing any values. So, we are
>> removing it.
> I noticed the pr_fmt definition later; that adds some useful context I
> didn't know about. I guess there's no struct device for the GIC? I
> don't see one in struct device_node. Seems like this piece of
> hardware that apparently responds to a memory range *could* have a
> struct device,but I'm a little fuzzy on how we handle ACPI and OF
> device descriptions in that regard.
For DT, v2m is advertised as a sub-node inside GIC. So, both of them has
the struct device_node references. IIUC, GIC node is match as irqchip,
and not as a traditional platform bus device.
Similarly, for ACPI, v2m is advertised as a sub-table inside MADT, and
we are using the fwnode_handle to reference to.
> I hadn't noticed the memory range part; maybe you could use %pR there?
I guess we could have :) I can send a separate patch to clean this up.
> Just to double-check, there's no off-by-one error in the SPI range, is
> there? The pattern I usually expect is "start, start + nr_items - 1".
In that case, this should have been [64:319]. I'll send a small patch to
clean this up.
> I'm just kibbitzing here; this isn't PCI code, and you don't need my
> ack, so just consider these as random observations.
Thanks for sharing your observation. It's always been good ones :)
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