linux-kernel - Re: [PATCH v5 0/7] PCI: Change assign unassigned resources per root bus bassis

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Message-ID: <CAE9FiQUknj7bw_G5et=QDuUe-oGbEGAPeZVU=SZK2VeCgM_cAw@mail.gmail.com>
Date:	Fri, 21 Jun 2013 20:00:48 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>
Cc:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v5 0/7] PCI: Change assign unassigned resources per root
 bus bassis

On Fri, May 31, 2013 at 11:03 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> BenH reported that there is some assign unassigned resource problem
> in powerpc.
>
> It turns out after
> | commit 0c5be0cb0edfe3b5c4b62eac68aa2aa15ec681af
> | Date:   Thu Feb 23 19:23:29 2012 -0800
> |
> |    PCI: Retry on IORESOURCE_IO type allocations
>
> even the root bus does not have io port range, it will keep retrying
> to realloc with mmio.
>
> After checking the code, found that we bound io port and mmio fail
> path together.
> First patch fix the problem, that will not make mmio fall back to must-only
> when only have io port fail with must+optional.
>
> During we found the fix for that problem, found that we can separate assign
> unassigned resources to per root bus.
> that will make the code simple, also could reuse it for hotadd path.
>
> These patches are targeted to 3.11
>
> -v4: split first patch into 4 patches per Bjorn.
> -v5: drop two patches that will pass root bus resource mask after we found
>      simple and less intrusive way to fix the problem.
>
>  PCI: Don't let mmio fallback to must-only, if ioport fails with must+optional
>  PCI: Don't use temp bus for pci_bus_release_bridge_resources
>  PCI: Use pci_walk_bus to detect unassigned resources
>  PCI: Introduce enable_local to prepare per root bus handling
>  PCI: Split pci_assign_unassigned_resources to per root bus
>  PCI: Enable pci bridge when it is needed
>  PCI: Retry assign unassigned resources for hotadd root bus

Hi, Bjorn,

Can you put this patchset in pci/next for 3.11?

Found another pciehp will need this one two. the pcie bridge does not
have io port range and it cause mmio get clear and retry.

Thanks

Yinghai
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