On Tue, Mar 6, 2012 at 8:31 PM, Bjorn Helgaas <bjorn.helgaas@xxxxxxxxx> wrote:
> On Tue, Mar 6, 2012 at 12:13 AM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
>>
>> It will be used to rediscover removed pci root buses.
>>
>> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
>> Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
>> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>> Cc: linux-doc@xxxxxxxxxxxxxxx
>> ---
>> Documentation/ABI/testing/sysfs-bus-pci | 9 +++++++++
>> drivers/pci/pci-sysfs.c | 21 +++++++++++++++++++++
>> 2 files changed, 30 insertions(+), 0 deletions(-)
>>
>> diff --git a/Documentation/ABI/testing/sysfs-bus-pci
>> b/Documentation/ABI/testing/sysfs-bus-pci
>> index 22392de..eb826bd 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-pci
>> +++ b/Documentation/ABI/testing/sysfs-bus-pci
>> @@ -66,6 +66,15 @@ Description:
>> re-discover previously removed devices.
>> Depends on CONFIG_HOTPLUG.
>>
>> +What: /sys/bus/pci/rescan_root
>> +Date: March 2012
>> +Contact: Linux PCI developers <linux-pci@xxxxxxxxxxxxxxx>
>> +Description:
>> + Writing a non-zero value to this attribute will
>> + cause a rescan of all PCI root buses in the system, and
>> + re-discover previously removed PCI root buses.
>
> This seems sort of backwards to me. Architecture-specific code
> enumerated the host bridges/root buses in the first place, not the PCI
> core. Now we're asking the PCI core (/sys/bus/pci) to re-enumerate
> them.
>
> But maybe it's still the right answer, I dunno.
>
>> + Depends on CONFIG_HOTPLUG.
>> +
>> What: /sys/bus/pci/devices/.../msi_irqs/
>> Date: September, 2011
>> Contact: Neil Horman <nhorman@xxxxxxxxxxxxx>
>> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
>> index f855b4b..d6221e5 100644
>> --- a/drivers/pci/pci-sysfs.c
>> +++ b/drivers/pci/pci-sysfs.c
>> @@ -302,8 +302,29 @@ static ssize_t bus_rescan_store(struct bus_type *bus,
>> const char *buf,
>> return count;
>> }
>>
>> +void __weak acpi_pci_root_rescan(void) { }
>> +void __weak pcibios_root_rescan(void) { }
>> +
>> +static ssize_t bus_rescan_root_store(struct bus_type *bus, const char
>> *buf,
>> + size_t count)
>> +{
>> + unsigned long val;
>> +
>> + if (strict_strtoul(buf, 0, &val) < 0)
>> + return -EINVAL;
>> +
>> + if (val) {
>> + mutex_lock(&pci_remove_rescan_mutex);
>> + acpi_pci_root_rescan();
>
> This architecture-dependent function name should not be here. How
> will we make this work for powerpc, sparc, etc.?
>
>> + pcibios_root_rescan();
>> + mutex_unlock(&pci_remove_rescan_mutex);
how about arch_pci_root_rescan(), and for x86 will let include
arch_pci_root_rescan()
pcibios_root_rescan().
need to check arch like powerpc, sparc to see if could
add pcibios_root_rescan()
Yinghai
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