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Subject[PATCH 05/24] PCI: add /proc/iobusn
Date
May help debug purpose.

need to fill root buses name.

Signed-off-by: Yinghai Lu <yinghai@kernel.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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