On 12/4/2012 2:57 PM, Bjorn Helgaas wrote:
> On Mon, Dec 3, 2012 at 6:28 AM, Wei Yongjun <weiyj.lk@xxxxxxxxx> wrote:
>> From: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>
>>
>> Use for_each_pci_dev to simplify the code.
>>
>> Signed-off-by: Wei Yongjun <yongjun_wei@xxxxxxxxxxxxxxxxx>
>> ---
>> arch/tile/kernel/pci.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c
>> index 7598226..aac1cd5 100644
>> --- a/arch/tile/kernel/pci.c
>> +++ b/arch/tile/kernel/pci.c
>> @@ -245,7 +245,7 @@ static void __devinit fixup_read_and_payload_sizes(void)
>> u16 new_values;
>>
>> /* Scan for the smallest maximum payload size. */
>> - while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
>> + for_each_pci_dev(dev) {
>> u32 devcap;
>> int max_payload;
>>
>> @@ -260,7 +260,7 @@ static void __devinit fixup_read_and_payload_sizes(void)
>>
>> /* Now, set the max_payload_size for all devices to that value. */
>> new_values = (max_read_size << 12) | (smallest_max_payload << 5);
>> - while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL)
>> + for_each_pci_dev(dev)
>> pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
>> PCI_EXP_DEVCTL_PAYLOAD | PCI_EXP_DEVCTL_READRQ,
>> new_values);
>>
>>
> This patch looks correct to me, as far as it goes.
>
> Of course, any time we use for_each_pci_dev(), it's a good clue that
> this code won't work for hotplug, so presumably you don't care about
> hotplug on this system.
Hotplug development is under way at the moment.
> tile/kernel/pci_gx.c has a function of the same name, implemented
> completely differently, which suggests that some unification or
> refactoring might be possible.
Sorry, which function are you referring to? You mention MPS/MRS so perhaps you're talking about fixup_read_and_payload_sizes()?
> In general, I think the PCI_EXP_DEVCAP and PCI_EXP_DEVCTL code for MPS
> and MRRS management belongs in the PCI core, not in drivers or
> architectures (it's fine if they provide device- or platform-specific
> constraints), so anything you can do to move in that direction would
> be good.
>
> Bjorn
Thanks!
--
Chris Metcalf, Tilera Corp.
http://www.tilera.com
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