From: Yinghai Lu <yinghai@kernel.org>
To: Jesse Barnes <jbarnes@virtuousgeek.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Tony Luck <tony.luck@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Dominik Brodowski <linux@dominikbrodowski.net>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: [PATCH 09/15] PCI: Add pci_bus_extend/shrink_top()
Date: Wed, 1 Feb 2012 14:43:56 -0800 [thread overview]
Message-ID: <1328136242-17725-10-git-send-email-yinghai@kernel.org> (raw)
In-Reply-To: <1328136242-17725-1-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.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/probe.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 79de0dd..91fdaec 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -624,6 +624,52 @@ static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
}
}
+static void __devinit pci_bus_extend_top(struct pci_bus *parent,
+ resource_size_t size, struct resource *parent_res)
+{
+ struct resource *res;
+
+ if (!size)
+ return;
+
+ while (parent) {
+ res = &parent->busn_res;
+ if (res == parent_res)
+ break;
+ res->end += size;
+ parent->subordinate += size;
+ pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS,
+ parent->subordinate);
+ dev_printk(KERN_DEBUG, &parent->dev,
+ "busn_res: extended %02llx to %pR\n",
+ (unsigned long long)size, res);
+ parent = parent->parent;
+ }
+}
+
+static void __devinit pci_bus_shrink_top(struct pci_bus *parent,
+ resource_size_t size, struct resource *parent_res)
+{
+ struct resource *res;
+
+ if (!size)
+ return;
+
+ while (parent) {
+ res = &parent->busn_res;
+ if (res == parent_res)
+ break;
+ res->end -= size;
+ parent->subordinate -= size;
+ pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS,
+ parent->subordinate);
+ dev_printk(KERN_DEBUG, &parent->dev,
+ "busn_res: shrunk %02llx to %pR\n",
+ (unsigned long long)size, res);
+ parent = parent->parent;
+ }
+}
+
/*
* 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:[~2012-02-01 22:46 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 22:43 [PATCH -v4 0/15] PCI: allocate pci bus num range for unassigned bridge busn Yinghai Lu
2012-02-01 22:43 ` [PATCH 01/15] Make %pR could handle bus resource with domain Yinghai Lu
2012-02-03 16:26 ` Bjorn Helgaas
2012-02-03 17:23 ` Yinghai Lu
2012-02-01 22:43 ` [PATCH 02/15] PCI: Add iobusn_resource Yinghai Lu
2012-02-03 16:36 ` Bjorn Helgaas
2012-02-03 17:19 ` Yinghai Lu
2012-02-03 23:38 ` Benjamin Herrenschmidt
2012-02-04 2:30 ` Yinghai Lu
2012-02-06 17:14 ` Bjorn Helgaas
2012-02-06 18:48 ` Yinghai Lu
2012-02-01 22:43 ` [PATCH 03/15] PCI: Add busn_res operation functions Yinghai Lu
2012-02-01 22:43 ` [PATCH 04/15] PCI: Add busn_res tracking in core Yinghai Lu
2012-02-01 22:43 ` [PATCH 05/15] PCI, x86: Register busn_res for root buses Yinghai Lu
2012-02-01 22:43 ` [PATCH 06/15] PCI, ia64: " Yinghai Lu
2012-02-01 22:43 ` [PATCH 07/15] PCI, powerpc: " Yinghai Lu
2012-02-01 22:43 ` [PATCH 08/15] PCI, parisc: " Yinghai Lu
2012-02-01 22:43 ` Yinghai Lu [this message]
2012-02-01 22:43 ` [PATCH 10/15] PCI: Probe safe range that we can use for unassigned bridge Yinghai Lu
2012-02-01 22:43 ` [PATCH 11/15] PCI: Strict checking of valid range for bridge Yinghai Lu
2012-02-01 22:43 ` [PATCH 12/15] PCI: Allocate bus range instead of use max blindly Yinghai Lu
2012-02-01 22:44 ` [PATCH 13/15] PCI: kill pci_fixup_parent_subordinate_busnr() Yinghai Lu
2012-02-01 22:44 ` [PATCH 14/15] PCI: Seperate child bus scanning to two passes overall Yinghai Lu
2012-02-01 22:44 ` [PATCH 15/15] pcmcia: remove workaround for fixing pci parent bus subordinate Yinghai Lu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1328136242-17725-10-git-send-email-yinghai@kernel.org \
--to=yinghai@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=benh@kernel.crashing.org \
--cc=bhelgaas@google.com \
--cc=jbarnes@virtuousgeek.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux@dominikbrodowski.net \
--cc=tony.luck@intel.com \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).