linux-kernel - [PATCH 06/21] PCI: Add busn

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Date:	Mon,  7 May 2012 13:29:51 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>,
	David Miller <davem@...emloft.net>, x86 <x86@...nel.org>
Cc:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 06/21] PCI: Add busn_res operation functions

Will use them insert/update busn res in pci_bus struct.

-v2: use update_resource() requested by Bjorn.
-v3: use domain_busn_res as root bus busn_res parent.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/probe.c |   63 +++++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/pci.h |    3 ++
 2 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 674a477..bfbf064 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1714,6 +1714,69 @@ err_out:
 	return NULL;
 }
 
+int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
+{
+	struct resource *res = &b->busn_res;
+	struct resource *parent_res;
+	int ret;
+
+	res->start = bus;
+	res->end = bus_max;
+	res->flags = IORESOURCE_BUS;
+
+	if (!pci_is_root_bus(b))
+		parent_res = &b->parent->busn_res;
+	else {
+		parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
+		res->flags |= IORESOURCE_PCI_FIXED;
+	}
+
+	ret = insert_resource(parent_res, res);
+
+	dev_printk(KERN_DEBUG, &b->dev,
+			"busn_res: %pR %s inserted under %s %pR\n",
+			res, ret ? "can not be" : "is",
+			pci_is_root_bus(b) ? "domain":"", parent_res);
+
+	return ret;
+}
+
+int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
+{
+	struct resource *res = &b->busn_res;
+	struct resource old_res = *res;
+	resource_size_t size;
+	int ret;
+
+	if (res->start > bus_max)
+		return -EINVAL;
+
+	size = bus_max - res->start + 1;
+	ret = adjust_resource(res, res->start, size);
+	dev_printk(KERN_DEBUG, &b->dev,
+			"busn_res: %pR end %s updated to %02x\n",
+			&old_res, ret ? "can not be" : "is", bus_max);
+
+	if (!ret && !res->parent)
+		pci_bus_insert_busn_res(b, res->start, res->end);
+
+	return ret;
+}
+
+void pci_bus_release_busn_res(struct pci_bus *b)
+{
+	struct resource *res = &b->busn_res;
+	int ret;
+
+	if (!res->flags || !res->parent)
+		return;
+
+	ret = release_resource(res);
+	dev_printk(KERN_DEBUG, &b->dev,
+			"busn_res: %pR %s released\n",
+			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)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index d588ef4..b5f2cc7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -667,6 +667,9 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 				    struct pci_ops *ops, void *sysdata,
 				    struct list_head *resources);
+int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
+int 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(struct device *parent, int bus,
 					     struct pci_ops *ops, void *sysdata,
 					     struct list_head *resources);
-- 
1.7.7

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