From: Yinghai Lu <yinghai@kernel.org>
To: Bjorn Helgaas <bhelgaas@google.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Tony Luck <tony.luck@intel.com>,
David Miller <davem@davemloft.net>, x86 <x86@kernel.org>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: [PATCH -v12 04/15] PCI: Add pci_bus_extend/shrink_top()
Date: Tue, 26 Jun 2012 11:53:58 -0700 [thread overview]
Message-ID: <1340736849-14875-5-git-send-email-yinghai@kernel.org> (raw)
In-Reply-To: <1340736849-14875-1-git-send-email-yinghai@kernel.org>
Extend or shrink bus and parent buses top (subordinate)
Extended range is verified safe range, and stop at recorded parent_res.
-v2: Remove busn_res change, it is updated in other function.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/probe.c | 28 ++++++++++++++++++++++++++++
1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index cd06c84..44c42ae 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -689,6 +689,34 @@ static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
}
}
+static void __devinit pci_bus_extend_top(struct pci_bus *parent,
+ long size, struct resource *parent_res)
+{
+ struct resource *res;
+
+ if (!size)
+ return;
+
+ while (parent) {
+ res = &parent->busn_res;
+ if (res == parent_res)
+ break;
+ pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS,
+ parent->busn_res.end);
+ dev_printk(KERN_DEBUG, &parent->dev,
+ "busn_res: %s %02lx to %pR\n",
+ (size > 0) ? "extended" : "shrunk",
+ abs(size), res);
+ parent = parent->parent;
+ }
+}
+
+static void __devinit pci_bus_shrink_top(struct pci_bus *parent,
+ long size, struct resource *parent_res)
+{
+ pci_bus_extend_top(parent, -size, parent_res);
+}
+
/*
* If it's a bridge, configure it and scan the bus behind it.
* For CardBus bridges, we don't scan behind as the devices will
--
1.7.7
next prev parent reply other threads:[~2012-06-26 18:53 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-26 18:53 [PATCH -v12 00/15] PCI: allocate pci bus num range for unassigned bridge busn Yinghai Lu
2012-06-26 18:53 ` [PATCH -v12 01/15] resources: Split out __allocate_resource() Yinghai Lu
2012-06-26 19:01 ` Linus Torvalds
2012-06-26 20:33 ` Yinghai Lu
2012-06-26 20:43 ` Linus Torvalds
2012-06-26 18:53 ` [PATCH -v12 02/15] resources: Add probe_resource() Yinghai Lu
2012-06-26 22:07 ` Yinghai Lu
2012-08-28 16:09 ` Yinghai Lu
2012-08-28 17:05 ` Linus Torvalds
2012-08-29 0:10 ` Linus Torvalds
2012-08-29 10:14 ` Ram Pai
2012-08-29 16:02 ` Yinghai Lu
2012-08-29 15:57 ` Yinghai Lu
2012-08-29 17:36 ` Yinghai Lu
2012-08-31 0:40 ` Bjorn Helgaas
2012-06-26 18:53 ` [PATCH -v12 03/15] resources: Replace registered resource in tree Yinghai Lu
2012-06-26 18:53 ` Yinghai Lu [this message]
2012-06-26 18:53 ` [PATCH -v12 05/15] PCI: Probe safe range that we can use for unassigned bridge Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 06/15] PCI: Add pci_bus_replace_busn_res() Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 07/15] PCI: Allocate bus range instead of use max blindly Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 08/15] PCI: Strict checking of valid range for bridge Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 09/15] PCI: Kill pci_fixup_parent_subordinate_busnr() Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 10/15] PCI: Seperate child bus scanning to two passes overall Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 11/15] pcmcia: Remove workaround for fixing pci parent bus subordinate Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 12/15] PCI: Double checking setting for bus register and bus struct Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 13/15] PCI, pciehp: Remove not needed bus number range checking Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 14/15] PCI: More strict checking of valid range for bridge Yinghai Lu
2012-06-26 18:54 ` [PATCH -v12 15/15] PCI: Don't shrink too much for hotplug bridge Yinghai Lu
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