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Date: Wed, 8 Feb 2012 09:26:52 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Tony Luck <tony.luck@...el.com>,
Dominik Brodowski <linux@...inikbrodowski.net>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arch@...r.kernel.org
Subject: Re: [PATCH 06/24] PCI: Add busn_res tracking in core
On Wed, Feb 8, 2012 at 8:08 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Sat, Feb 4, 2012 at 10:57 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>> update pci_scan_root_bus, and pci_scan_bus to insert root bus busn into
>> iobusn_resource tree.
>>
>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>> ---
>> drivers/pci/probe.c | 30 ++++++++++++++++++++++++++----
>> drivers/pci/remove.c | 1 +
>> include/linux/pci.h | 4 ++++
>> 3 files changed, 31 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index fabf9d0..cdd6e83 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -1667,8 +1667,9 @@ void pci_bus_release_busn_res(struct pci_bus *b)
>> res, ret ? "can not be" : "is");
>> }
>>
>> -struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
>> - struct pci_ops *ops, void *sysdata, struct list_head *resources)
>> +struct pci_bus * __devinit pci_scan_root_bus_max(struct device *parent, int bus,
>> + int bus_max, struct pci_ops *ops, void *sysdata,
>> + struct list_head *resources)
>> {
>> struct pci_bus *b;
>>
>> @@ -1676,10 +1677,26 @@ struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
>> if (!b)
>> return NULL;
>>
>> + pci_bus_insert_busn_res(b, bus, bus_max);
>> b->subordinate = pci_scan_child_bus(b);
>> pci_bus_add_devices(b);
>> return b;
>> }
>> +EXPORT_SYMBOL(pci_scan_root_bus_max);
>> +
>> +struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
>> + struct pci_ops *ops, void *sysdata,
>> + struct list_head *resources)
>> +{
>> + struct pci_bus *b;
>> +
>> + b = pci_scan_root_bus_max(parent, bus, 255, ops, sysdata, resources);
>> +
>> + if (b)
>> + pci_bus_update_busn_res_end(b, b->subordinate);
>> +
>> + return b;
>> +}
>> EXPORT_SYMBOL(pci_scan_root_bus);
>>
>> /* Deprecated; use pci_scan_root_bus() instead */
>> @@ -1692,9 +1709,11 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
>> pci_add_resource(&resources, &ioport_resource);
>> pci_add_resource(&resources, &iomem_resource);
>> b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
>> - if (b)
>> + if (b) {
>> + pci_bus_insert_busn_res(b, bus, 255);
>> b->subordinate = pci_scan_child_bus(b);
>> - else
>> + pci_bus_update_busn_res_end(b, b->subordinate);
>> + } else
>> pci_free_resource_list(&resources);
>> return b;
>> }
>> @@ -1710,7 +1729,10 @@ struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *ops,
>> pci_add_resource(&resources, &iomem_resource);
>> b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
>> if (b) {
>> + pci_bus_insert_busn_res(b, bus, 255);
>> b->subordinate = pci_scan_child_bus(b);
>> + pci_bus_update_busn_res_end(b, b->subordinate);
>> +
>> pci_bus_add_devices(b);
>> } else {
>> pci_free_resource_list(&resources);
>> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
>> index 82f8ae5..5b679d2 100644
>> --- a/drivers/pci/remove.c
>> +++ b/drivers/pci/remove.c
>> @@ -68,6 +68,7 @@ void pci_remove_bus(struct pci_bus *pci_bus)
>>
>> down_write(&pci_bus_sem);
>> list_del(&pci_bus->node);
>> + pci_bus_release_busn_res(pci_bus);
>> up_write(&pci_bus_sem);
>> if (!pci_bus->is_added)
>> return;
>> diff --git a/include/linux/pci.h b/include/linux/pci.h
>> index 3da935c..d5b6786 100644
>> --- a/include/linux/pci.h
>> +++ b/include/linux/pci.h
>> @@ -668,6 +668,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
>> void pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
>> void pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
>> void pci_bus_release_busn_res(struct pci_bus *b);
>> +struct pci_bus * __devinit pci_scan_root_bus_max(struct device *parent, int bus,
>> + int busmax, struct pci_ops *ops,
>> + void *sysdata,
>> + struct list_head *resources);
>> struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
>> struct pci_ops *ops, void *sysdata,
>> struct list_head *resources);
>
> Now we have both pci_bus_insert_busn_res() and
> pci_scan_root_bus_max(). Why do we need both? I think it's too much
> of a burden on architectures to expect them to understand both.
>
> Maybe some sample pseudo-code using both interfaces would help me
> understand what you expect a typical architecture to do.
We need to call pci_bus_insert_busn_res for root bus:
1. after that bus is allocated (...) : that busn_res is in the bus struct.
2. before pci_scan_child_bus
Yinghai
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