From: Yinghai Lu <yinghai.lu@oracle.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org,
Jesse Barnes <jbarnes@virtuousgeek.org>
Subject: Re: [PATCH v2 06/29] x86/PCI: convert to pci_create_root_bus() and pci_scan_root_bus()
Date: Fri, 14 Oct 2011 14:15:35 -0700 [thread overview]
Message-ID: <4E98A677.6050507@oracle.com> (raw)
In-Reply-To: <CAErSpo4629XKU=TNp0cb6Cxc+Jm_dQcD4244eTna2TC49_EtTw@mail.gmail.com>
On 10/14/2011 01:54 PM, Bjorn Helgaas wrote:
> On Fri, Oct 14, 2011 at 2:39 PM, Yinghai Lu <yinghai.lu@oracle.com> wrote:
>> On 10/14/2011 01:32 PM, Bjorn Helgaas wrote:
>>
>>
>>>>> int node;
>>>>> @@ -353,11 +349,18 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
>>>>> memcpy(bus->sysdata, sd, sizeof(*sd));
>>>>> kfree(sd);
>>>>> } else {
>>>>> - bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
>>>>> - if (bus) {
>>>>> - get_current_resources(device, busnum, domain, bus);
>>>>> - bus->subordinate = pci_scan_child_bus(bus);
>>>>> + INIT_LIST_HEAD(&resources);
>>>>> + get_current_resources(device, busnum, domain, &resources);
>>>>> + if (!pci_use_crs) {
>>>>> + pci_free_resource_list(&resources);
>>>>> + x86_pci_root_bus_resources(busnum, &resources);
>>>>> }
>>>>
>>>>
>>>> You may need to update get_current_resources() to return status about handling _CRS...
>>>> and check that status insteaf of !pci_use_crs.
>>>
>>> Is the current patch broken here? I don't think it will be simpler to
>>> have get_current_resources() return a status and check that. But if
>>> something's actually broken, I want to fix it, of course.
>>>
>>
>>
>> yes. if for some reason, _CRS is not handled right, that root bus resources will not get set to default res.
>>
>> + status = get_current_resources(device, busnum, domain, &resources);
>> + if (status) {
>> + pci_free_resource_list(&resources);
>> + x86_pci_root_bus_resources(busnum, &resources);
>> }
>>
>> get_current_resources() will not return 0 if _CRS is not really used.
>
> OK. I think it was that way before, too. We created the bus with
> default resources, but the first thing get_current_resources() did was
> clear them all out. If there was a problem parsing _CRS, we never
> went back and put the defaults back in.
that means you broke it when you clean up it last time.
>
> But I think this will do what you suggest and is nicer than what I had before:
>
> INIT_LIST_HEAD(&resources);
> get_current_resources(device, busnum, domain, &resources);
> if (list_empty(&resources))
> x86_pci_root_bus_resources(busnum, &resources);
yes, that should work.
Yinghai
next prev parent reply other threads:[~2011-10-14 21:15 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-14 4:27 [PATCH v2 00/29] Create PCI root buses with correct resources Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 01/29] PCI: add helpers for building PCI bus resource lists Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 02/29] PCI: add pci_create_root_bus(), deprecate pci_create_bus() Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 03/29] PCI: add pci_scan_root_bus(), deprecate pci_scan_bus() and pci_scan_bus_parented() Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 04/29] MIPS: PCI: convert to pci_scan_root_bus() for correct root bus resources Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 05/29] x86/PCI: use pci_scan_bus() instead of pci_scan_bus_parented() Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 06/29] x86/PCI: convert to pci_create_root_bus() and pci_scan_root_bus() Bjorn Helgaas
2011-10-14 5:30 ` Yinghai Lu
2011-10-14 20:32 ` Bjorn Helgaas
2011-10-14 20:39 ` Yinghai Lu
2011-10-14 20:54 ` Bjorn Helgaas
2011-10-14 20:54 ` Bjorn Helgaas
2011-10-14 21:15 ` Yinghai Lu [this message]
2011-10-14 21:15 ` Yinghai Lu
2011-10-14 4:27 ` [PATCH v2 07/29] powerpc/PCI: make pcibios_setup_phb_resources() static Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 08/29] powerpc/PCI: split PHB part out of pcibios_map_io_space() Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:27 ` [PATCH v2 09/29] powerpc/PCI: convert to pci_create_root_bus() for correct root bus resources Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 7:34 ` Benjamin Herrenschmidt
2011-10-14 4:27 ` [PATCH v2 10/29] microblaze/PCI: fix pci_bus_for_each_resource() usage Bjorn Helgaas
2011-10-14 4:27 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 11/29] microblaze/PCI: make pcibios_setup_phb_resources() static Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 12/29] microblaze/PCI: convert to pci_create_root_bus() for correct root bus resources Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 13/29] microblaze/PCI: use pci_scan_root_bus() Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 14/29] sparc/PCI: convert to pci_create_root_bus() for correct root bus resources Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:46 ` David Miller
2011-10-14 4:46 ` David Miller
2011-10-14 4:49 ` David Miller
2011-10-14 4:28 ` [PATCH v2 15/29] sparc32, leon/PCI: convert to pci_scan_root_bus() " Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:43 ` David Miller
2011-10-14 4:28 ` [PATCH v2 16/29] ia64/PCI: use pci_create_bus() instead of pci_scan_bus_parented() Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 17/29] ia64/PCI: convert to pci_create_root_bus() for correct root bus resources Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 18/29] parisc/PCI: use pci_create_root_bus() instead of pci_scan_bus_parented() Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 19/29] parisc/PCI: supply root bus resources to pci_create_root_bus() Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 20/29] parisc/PCI: deal with LMMIO/PAT overlaps before creating PCI root bus Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 21/29] parisc/PCI: use pci_create_root_bus() instead of pci_scan_bus_parented() Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:28 ` [PATCH v2 22/29] parisc/PCI: supply root bus resources to pci_create_root_bus() Bjorn Helgaas
2011-10-14 4:28 ` Bjorn Helgaas
2011-10-14 4:29 ` [PATCH v2 23/29] xen/PCI: use pci_create_root_bus() instead of pci_scan_bus_parented() Bjorn Helgaas
2011-10-14 4:29 ` Bjorn Helgaas
2011-10-14 4:29 ` [PATCH v2 24/29] alpha/PCI: convert to pci_scan_root_bus() for correct root bus resources Bjorn Helgaas
2011-10-14 4:29 ` Bjorn Helgaas
2011-10-14 4:29 ` [PATCH v2 25/29] arm/PCI: " Bjorn Helgaas
2011-10-14 4:29 ` [PATCH v2 26/29] frv/PCI: " Bjorn Helgaas
2011-10-14 4:29 ` Bjorn Helgaas
2011-10-14 4:29 ` [PATCH v2 27/29] mn10300/PCI: " Bjorn Helgaas
2011-10-14 4:29 ` Bjorn Helgaas
2011-10-14 4:29 ` [PATCH v2 28/29] sh/PCI: " Bjorn Helgaas
2011-10-14 4:29 ` Bjorn Helgaas
2011-10-14 4:29 ` [PATCH v2 29/29] xtensa/PCI: " Bjorn Helgaas
2011-10-14 4:29 ` Bjorn Helgaas
2011-10-14 15:14 ` [PATCH v2 00/29] Create PCI root buses with correct resources James Bottomley
2011-10-14 15:14 ` James Bottomley
2011-10-14 15:33 ` Bjorn Helgaas
2011-10-14 15:45 ` James Bottomley
2011-10-14 15:45 ` James Bottomley
2011-10-14 17:21 ` Bjorn Helgaas
2011-10-14 17:21 ` Bjorn Helgaas
2011-12-20 15:55 ` Bjorn Helgaas
2011-12-20 15:55 ` Bjorn Helgaas
2011-12-22 18:59 ` David Miller
2011-12-22 19:15 ` David Miller
2011-12-22 19:15 ` David Miller
2011-12-22 19:56 ` David Miller
2011-12-22 22:02 ` David Miller
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