linux-kernel - [PATCH 05/24] PCI: add /proc/iobusn

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Date:	Sat,  4 Feb 2012 22:57:49 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tony Luck <tony.luck@...el.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 05/24] PCI: add /proc/iobusn

May help debug purpose.

need to fill root buses name.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/probe.c |    3 +++
 kernel/resource.c   |   42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8d4de5e..fabf9d0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1594,6 +1594,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 
 	b->number = b->secondary = bus;
 
+	sprintf(b->name, "PCI Bus %04x:%02x", pci_domain_nr(b), b->number);
+
 	/* Add initial resources to the bus */
 	list_for_each_entry_safe(bus_res, n, resources, list)
 		list_move_tail(&bus_res->list, &b->resources);
@@ -1631,6 +1633,7 @@ void pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
 	res->start = busn(pci_domain_nr(b), bus);
 	res->end = busn(pci_domain_nr(b), bus_max);
 	res->flags = IORESOURCE_BUS;
+	res->name = b->name;
 
 	if (!pci_is_root_bus(b))
 		parent_res = &b->parent->busn_res;
diff --git a/kernel/resource.c b/kernel/resource.c
index 53b42f0..1a73a81 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -113,6 +113,30 @@ static const struct seq_operations resource_op = {
 	.show	= r_show,
 };
 
+static int busn_r_show(struct seq_file *m, void *v)
+{
+	struct resource *root = m->private;
+	struct resource *r = v, *p;
+	int depth;
+
+	for (depth = 0, p = r; depth < MAX_IORES_LEVEL; depth++, p = p->parent)
+		if (p->parent == root)
+			break;
+	seq_printf(m, "%*s%04x:%02x-%04x:%02x : %s\n",
+			depth * 2, "",
+			busn_domain_nr(r->start), busn_bus_nr(r->start),
+			busn_domain_nr(r->end), busn_bus_nr(r->end),
+			r->name ? r->name : "<BAD>");
+	return 0;
+}
+
+static const struct seq_operations busn_resource_op = {
+	.start	= r_start,
+	.next	= r_next,
+	.stop	= r_stop,
+	.show	= busn_r_show,
+};
+
 static int ioports_open(struct inode *inode, struct file *file)
 {
 	int res = seq_open(file, &resource_op);
@@ -133,6 +157,16 @@ static int iomem_open(struct inode *inode, struct file *file)
 	return res;
 }
 
+static int iobusn_open(struct inode *inode, struct file *file)
+{
+	int res = seq_open(file, &busn_resource_op);
+	if (!res) {
+		struct seq_file *m = file->private_data;
+		m->private = &iobusn_resource;
+	}
+	return res;
+}
+
 static const struct file_operations proc_ioports_operations = {
 	.open		= ioports_open,
 	.read		= seq_read,
@@ -147,10 +181,18 @@ static const struct file_operations proc_iomem_operations = {
 	.release	= seq_release,
 };
 
+static const struct file_operations proc_iobusn_operations = {
+	.open		= iobusn_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
 static int __init ioresources_init(void)
 {
 	proc_create("ioports", 0, NULL, &proc_ioports_operations);
 	proc_create("iomem", 0, NULL, &proc_iomem_operations);
+	proc_create("iobusn", 0, NULL, &proc_iobusn_operations);
 	return 0;
 }
 __initcall(ioresources_init);
-- 
1.7.7

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