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Date: Wed, 8 Feb 2012 08:08:19 -0800
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Yinghai Lu <yinghai@...nel.org>
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 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.
Bjorn
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