On 2017/5/15 17:17, Lorenzo Pieralisi wrote:
> On Mon, May 15, 2017 at 02:13:47PM +0800, Zhou Wang wrote:
>> On 2017/4/26 18:06, Lorenzo Pieralisi wrote:
>>> The introduction of pci_bus_find_numa_node(pci_bus) allows at PCI
>>> host bridge registration to detect the NUMA node for a given
>>> struct pci_bus.dev. Implement an ACPI method that, through
>>> the struct pci_bus.bridge ACPI companion, retrieve and return
>>> the NUMA node corresponding to a given struct pci_bus.dev.
>>>
>>> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
>>> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
>>> ---
>>> drivers/pci/pci-acpi.c | 20 ++++++++++++++++++++
>>> include/linux/pci.h | 6 ++++++
>>> 2 files changed, 26 insertions(+)
>>>
>>> diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
>>> index 0018603..915da79 100644
>>> --- a/drivers/pci/pci-acpi.c
>>> +++ b/drivers/pci/pci-acpi.c
>>> @@ -10,6 +10,7 @@
>>> #include <linux/delay.h>
>>> #include <linux/init.h>
>>> #include <linux/irqdomain.h>
>>> +#include <linux/numa.h>
>>> #include <linux/pci.h>
>>> #include <linux/msi.h>
>>> #include <linux/pci_hotplug.h>
>>> @@ -853,6 +854,25 @@ struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
>>> return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
>>> }
>>>
>>> +int acpi_pci_bus_find_numa_node(struct pci_bus *bus)
>>> +{
>>> + int node = NUMA_NO_NODE;
>>> + struct device *bridge = get_device(bus->bridge);
>>> +
>>> + if (!bridge)
>>> + return node;
>>> +
>>> + if (has_acpi_companion(bridge)) {
>>> + struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
>>> +
>>> + node = acpi_get_node(adev->handle);
>>> + }
>>> +
>>> + put_device(bridge);
>>> +
>>> + return node;
>>> +}
>>> +
>>
>> It seems there is no function to call this, am I right?
>
> Sorry, I missed updating pci_bus_find_numa_node() while reshuffling
> the code, apologies.
>
> I will repost shortly.
>
>> Another question is that: in the latest IORT revision C, "Proximity
>> domain" has been added to the IORT spec. So when we enable NUMA for a
>> PCIe device, should we also consider this?
>
> That's for the SMMU device.
Sorry, this is another problem. Now I get it that this Proximity domain
is for SMMU itself.
Thanks,
Zhou
>
> Lorenzo
>
>> Thanks,
>> Zhou
>>
>>> static int __init acpi_pci_init(void)
>>> {
>>> int ret;
>>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>>> index 9e62462..b40d095 100644
>>> --- a/include/linux/pci.h
>>> +++ b/include/linux/pci.h
>>> @@ -1481,6 +1481,12 @@ static inline int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
>>> #endif
>>> int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent);
>>> #endif
>>> +#ifdef CONFIG_ACPI
>>> +int acpi_pci_bus_find_numa_node(struct pci_bus *bus);
>>> +#else
>>> +static inline int acpi_pci_bus_find_numa_node(struct pci_bus *bus)
>>> +{ return NUMA_NO_NODE; }
>>> +#endif
>>> int pci_bus_find_numa_node(struct pci_bus *bus);
>>>
>>> /* some architectures require additional setup to direct VGA traffic */
>>>
>>
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>
> .
>
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