linux-kernel - Re: [PATCH part2 6/6] PCI: Claim hw/fw allocated resources in hot add path.

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Message-ID: <CAE9FiQUB6wshovj=TBmCEL140nZB5K40BfKPYGNmmpZx536F+Q@mail.gmail.com>
Date:	Mon, 17 Sep 2012 21:44:08 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, x86 <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH part2 6/6] PCI: Claim hw/fw allocated resources in hot add path.

On Mon, Sep 17, 2012 at 5:12 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Sun, Sep 2, 2012 at 3:50 PM, Yinghai Lu <yinghai@...nel.org> wrote:

>> -static void __init pcibios_allocate_bridge_resources(struct pci_dev *dev)
>> +static void pcibios_allocate_bridge_resources(struct pci_dev *dev)
>
> This patch has a little too much going on at the same time.  Can you
> split the __init removal into its own patch so we can focus on what's
> left by itself?

ok.

>
>>  {
>>         int idx;
>>         struct resource *r;
>>
>>         for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
>>                 r = &dev->resource[idx];
>> +               if (r->parent)  /* Already allocated */
>> +                       continue;
>
> This is also a potentially interesting change that maybe should be in
> its own patch.

oh, we don't need that extra checking anymore. because support
removing non-root bus is dropped.

>> +void pcibios_resource_survey_bus(struct pci_bus *bus)
>> +{
>> +       dev_printk(KERN_DEBUG, &bus->dev, "Allocating resources\n");
>> +
>> +       pcibios_allocate_bus_resources(bus);
>> +
>> +       pcibios_allocate_resources(bus, 0);
>> +       pcibios_allocate_resources(bus, 1);
>> +
>> +       pcibios_allocate_rom_resources(bus);
>> +}
>> +
>>  void __init pcibios_resource_survey(void)
>
> I wish pcibios_resource_survey() could look like this:
>
>     void __init pcibios_resource_survey(void)
>     {
>         list_for_each_entry(bus, &pci_root_buses, node)
>             pcibios_resource_survey_bus(bus)
>
>         e820_reserve_resources_late();
>         ...
>
> but maybe there's a reason why pcibios_allocate_rom_resources() really
> has to be in the pcibios_assign_resources() fs_initcall rather than in
> pcibios_resource_survey().

that should be another patch later.

Thanks

Yinghai
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