[PATCH v2 5/7] PCI: replace bus resource table with a list

From: Bjorn Helgaas
Date: Mon Feb 08 2010 - 17:44:57 EST


Previously we used a table of size PCI_BUS_NUM_RESOURCES for resources
forwarded to a bus by its upstream bridge. We've increased this size
several times when the table overflowed.

But there's no good limit on the number of resources for a bus because
host bridges can forward any number of ranges to their secondary buses
(i.e., PCI root buses).

This patch replaces the fixed-size table with a list.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
---

arch/ia64/pci/pci.c | 20 +++---
arch/x86/pci/acpi.c | 33 +----------
arch/x86/pci/bus_numa.c | 9 ++-
drivers/pci/bus.c | 50 +++++++++++++++-
drivers/pci/hotplug/shpchp_sysfs.c | 15 +++--
drivers/pci/pci.c | 6 +-
drivers/pci/probe.c | 35 +++++++----
drivers/pci/setup-bus.c | 111 +++++++++++++++++-------------------
drivers/pcmcia/rsrc_nonstatic.c | 7 +-
drivers/pcmcia/yenta_socket.c | 7 +-
include/linux/pci.h | 16 ++++-
11 files changed, 169 insertions(+), 140 deletions(-)


diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 783c83b..ad64554 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -320,9 +320,9 @@ static __devinit acpi_status add_window(struct acpi_resource *res, void *data)
static void __devinit
pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl)
{
- int i, j;
+ int i;

- j = 0;
+ pci_bus_remove_resources(bus);
for (i = 0; i < ctrl->windows; i++) {
struct resource *res = &ctrl->window[i].resource;
/* HP's firmware has a hack to work around a Windows bug.
@@ -330,13 +330,7 @@ pcibios_setup_root_windows(struct pci_bus *bus, struct pci_controller *ctrl)
if ((res->flags & IORESOURCE_MEM) &&
(res->end - res->start < 16))
continue;
- if (j >= PCI_BUS_NUM_RESOURCES) {
- dev_warn(&bus->dev,
- "ignoring host bridge window %pR (no space)\n",
- res);
- continue;
- }
- bus->resource[j++] = res;
+ pci_bus_add_resource(bus, res, 0);
}
}

@@ -451,13 +445,15 @@ EXPORT_SYMBOL(pcibios_bus_to_resource);

static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
{
- unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+ unsigned int type_mask = IORESOURCE_IO | IORESOURCE_MEM;
struct resource *devr = &dev->resource[idx];
+ struct pci_bus_resource *bus_res;

if (!dev->bus)
return 0;
- for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
- struct resource *busr = dev->bus->resource[i];
+
+ list_for_each_entry(bus_res, &dev->bus->resources, list) {
+ struct resource *busr = bus_res->res;

if (!busr || ((busr->flags ^ devr->flags) & type_mask))
continue;
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 959e548..a2f8cdb 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -45,20 +45,6 @@ count_resource(struct acpi_resource *acpi_res, void *data)
return AE_OK;
}

-static int
-bus_has_transparent_bridge(struct pci_bus *bus)
-{
- struct pci_dev *dev;
-
- list_for_each_entry(dev, &bus->devices, bus_list) {
- u16 class = dev->class >> 8;
-
- if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent)
- return true;
- }
- return false;
-}
-
static void
align_resource(struct acpi_device *bridge, struct resource *res)
{
@@ -92,12 +78,8 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
acpi_status status;
unsigned long flags;
struct resource *root;
- int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
u64 start, end;

- if (bus_has_transparent_bridge(info->bus))
- max_root_bus_resources -= 3;
-
status = resource_to_addr(acpi_res, &addr);
if (!ACPI_SUCCESS(status))
return AE_OK;
@@ -115,15 +97,6 @@ setup_resource(struct acpi_resource *acpi_res, void *data)

start = addr.minimum + addr.translation_offset;
end = start + addr.address_length - 1;
- if (info->res_num >= max_root_bus_resources) {
- if (pci_probe & PCI_USE__CRS)
- printk(KERN_WARNING "PCI: Failed to allocate "
- "0x%lx-0x%lx from %s for %s due to _CRS "
- "returning more than %d resource descriptors\n",
- (unsigned long) start, (unsigned long) end,
- root->name, info->name, max_root_bus_resources);
- return AE_OK;
- }

res = &info->res[info->res_num];
res->name = info->name;
@@ -143,7 +116,7 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
dev_err(&info->bridge->dev,
"can't allocate host bridge window %pR\n", res);
} else {
- info->bus->resource[info->res_num] = res;
+ pci_bus_add_resource(info->bus, res, 0);
info->res_num++;
if (addr.translation_offset)
dev_info(&info->bridge->dev, "host bridge window %pR "
@@ -164,7 +137,9 @@ get_current_resources(struct acpi_device *device, int busnum,
struct pci_root_info info;
size_t size;

- if (!(pci_probe & PCI_USE__CRS))
+ if (pci_probe & PCI_USE__CRS)
+ pci_bus_remove_resources(bus);
+ else
dev_info(&device->dev,
"ignoring host bridge windows from ACPI; "
"boot with \"pci=use_crs\" to use them\n");
diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c
index f939d60..6999970 100644
--- a/arch/x86/pci/bus_numa.c
+++ b/arch/x86/pci/bus_numa.c
@@ -12,10 +12,12 @@ void x86_pci_root_bus_res_quirks(struct pci_bus *b)
int i;
int j;
struct pci_root_info *info;
+ struct pci_bus_resource *bus_res;

/* don't go for it if _CRS is used already */
- if (b->resource[0] != &ioport_resource ||
- b->resource[1] != &iomem_resource)
+ bus_res = list_first_entry(&b->resources, struct pci_bus_resource,
+ list);
+ if (bus_res->res != &ioport_resource)
return;

if (!pci_root_num)
@@ -36,13 +38,14 @@ void x86_pci_root_bus_res_quirks(struct pci_bus *b)
printk(KERN_DEBUG "PCI: peer root bus %02x res updated from pci conf\n",
b->number);

+ pci_bus_remove_resources(b);
info = &pci_root_info[i];
for (j = 0; j < info->res_num; j++) {
struct resource *res;
struct resource *root;

res = &info->res[j];
- b->resource[j] = res;
+ pci_bus_add_resource(b, res, 0);
if (res->flags & IORESOURCE_IO)
root = &ioport_resource;
else
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index a26135b..9725846 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -17,6 +17,49 @@

#include "pci.h"

+void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
+ unsigned int flags)
+{
+ struct pci_bus_resource *bus_res;
+
+ bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
+ if (!bus_res) {
+ dev_err(&bus->dev, "can't add %pR resource\n", res);
+ return;
+ }
+
+ bus_res->res = res;
+ bus_res->flags = flags;
+ list_add_tail(&bus_res->list, &bus->resources);
+}
+
+struct resource *pci_bus_get_resource(struct pci_bus *bus, unsigned long flags,
+ int num)
+{
+ struct pci_bus_resource *bus_res;
+ struct resource *res;
+
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ if (!(bus_res->flags & PCI_POSITIVE_DECODE))
+ continue;
+
+ res = bus_res->res;
+ if (((res->flags & flags) == flags) && num-- == 0)
+ return res;
+ }
+ return NULL;
+}
+
+void pci_bus_remove_resources(struct pci_bus *bus)
+{
+ struct pci_bus_resource *bus_res, *tmp;
+
+ list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
+ list_del(&bus_res->list);
+ kfree(bus_res);
+ }
+}
+
/**
* pci_bus_alloc_resource - allocate a resource from a parent bus
* @bus: PCI bus
@@ -42,7 +85,8 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
resource_size_t),
void *alignf_data)
{
- int i, ret = -ENOMEM;
+ int ret = -ENOMEM;
+ struct pci_bus_resource *bus_res;
resource_size_t max = -1;

type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
@@ -51,8 +95,8 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
if (!(res->flags & IORESOURCE_MEM_64))
max = PCIBIOS_MAX_MEM_32;

- for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
- struct resource *r = bus->resource[i];
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ struct resource *r = bus_res->res;
if (!r)
continue;

diff --git a/drivers/pci/hotplug/shpchp_sysfs.c b/drivers/pci/hotplug/shpchp_sysfs.c
index 29fa9d2..e1a9d6a 100644
--- a/drivers/pci/hotplug/shpchp_sysfs.c
+++ b/drivers/pci/hotplug/shpchp_sysfs.c
@@ -39,16 +39,17 @@ static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, cha
{
struct pci_dev *pdev;
char * out = buf;
- int index, busnr;
+ int busnr;
struct resource *res;
struct pci_bus *bus;
+ struct pci_bus_resource *bus_res;

pdev = container_of (dev, struct pci_dev, dev);
bus = pdev->subordinate;

out += sprintf(buf, "Free resources: memory\n");
- for (index = 0; index < PCI_BUS_NUM_RESOURCES; index++) {
- res = bus->resource[index];
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ res = bus_res->res;
if (res && (res->flags & IORESOURCE_MEM) &&
!(res->flags & IORESOURCE_PREFETCH)) {
out += sprintf(out, "start = %8.8llx, "
@@ -58,8 +59,8 @@ static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, cha
}
}
out += sprintf(out, "Free resources: prefetchable memory\n");
- for (index = 0; index < PCI_BUS_NUM_RESOURCES; index++) {
- res = bus->resource[index];
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ res = bus_res->res;
if (res && (res->flags & IORESOURCE_MEM) &&
(res->flags & IORESOURCE_PREFETCH)) {
out += sprintf(out, "start = %8.8llx, "
@@ -69,8 +70,8 @@ static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, cha
}
}
out += sprintf(out, "Free resources: IO\n");
- for (index = 0; index < PCI_BUS_NUM_RESOURCES; index++) {
- res = bus->resource[index];
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ res = bus_res->res;
if (res && (res->flags & IORESOURCE_IO)) {
out += sprintf(out, "start = %8.8llx, "
"length = %8.8llx\n",
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d62a5de..60a6a88 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -385,11 +385,11 @@ struct resource *
pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
{
const struct pci_bus *bus = dev->bus;
- int i;
+ struct pci_bus_resource *bus_res;
struct resource *best = NULL;

- for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
- struct resource *r = bus->resource[i];
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ struct resource *r = bus_res->res;
if (!r)
continue;
if (res->start && !(res->start >= r->start && res->end <= r->end))
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 838a2c4..04e7e97 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -89,6 +89,7 @@ static void release_pcibus_dev(struct device *dev)

if (pci_bus->bridge)
put_device(pci_bus->bridge);
+ pci_bus_remove_resources(pci_bus);
kfree(pci_bus);
}

@@ -288,7 +289,8 @@ static void __devinit pci_read_bridge_io(struct pci_bus *child)
unsigned long base, limit;
struct resource *res;

- res = child->resource[0];
+ res = &dev->resource[PCI_BRIDGE_RESOURCES + 0];
+
pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
@@ -323,7 +325,8 @@ static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
unsigned long base, limit;
struct resource *res;

- res = child->resource[1];
+ res = &dev->resource[PCI_BRIDGE_RESOURCES + 1];
+
pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
@@ -347,7 +350,8 @@ static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
unsigned long base, limit;
struct resource *res;

- res = child->resource[2];
+ res = &dev->resource[PCI_BRIDGE_RESOURCES + 2];
+
pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
@@ -394,7 +398,7 @@ static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
void __devinit pci_read_bridge_bases(struct pci_bus *child)
{
struct pci_dev *dev = child->self;
- int i;
+ struct pci_bus_resource *bus_res;

if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
return;
@@ -408,12 +412,11 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
pci_read_bridge_mmio_pref(child);

if (dev->transparent) {
- for (i = 3; i < PCI_BUS_NUM_RESOURCES; i++) {
- child->resource[i] = child->parent->resource[i - 3];
- if (child->resource[i])
- dev_printk(KERN_DEBUG, &dev->dev,
- " bridge window %pR (subtractive decode)\n",
- child->resource[i]);
+ list_for_each_entry(bus_res, &child->parent->resources, list) {
+ pci_bus_add_resource(child, bus_res->res, 0);
+ dev_printk(KERN_DEBUG, &dev->dev,
+ " bridge window %pR (subtractive decode)\n",
+ bus_res->res);
}
}
}
@@ -428,6 +431,7 @@ static struct pci_bus * pci_alloc_bus(void)
INIT_LIST_HEAD(&b->children);
INIT_LIST_HEAD(&b->devices);
INIT_LIST_HEAD(&b->slots);
+ INIT_LIST_HEAD(&b->resources);
b->max_bus_speed = PCI_SPEED_UNKNOWN;
b->cur_bus_speed = PCI_SPEED_UNKNOWN;
}
@@ -573,6 +577,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
{
struct pci_bus *child;
int i;
+ struct resource *res;

/*
* Allocate a new bus, and inherit stuff from the parent..
@@ -611,9 +616,11 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,

/* Set up default resource pointers and names.. */
for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
- child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
- child->resource[i]->name = child->name;
+ res = &bridge->resource[PCI_BRIDGE_RESOURCES + i];
+ res->name = child->name;
+ pci_bus_add_resource(child, res, PCI_POSITIVE_DECODE);
}
+
bridge->subordinate = child;

return child;
@@ -1449,8 +1456,8 @@ struct pci_bus * pci_create_bus(struct device *parent,
pci_create_legacy_files(b);

b->number = b->secondary = bus;
- b->resource[0] = &ioport_resource;
- b->resource[1] = &iomem_resource;
+ pci_bus_add_resource(b, &ioport_resource, 0);
+ pci_bus_add_resource(b, &iomem_resource, 0);

return b;

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 743ed8c..8a3b512 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -138,58 +138,53 @@ static void pbus_assign_resources_sorted(const struct pci_bus *bus,
__assign_resources_sorted(&head, fail_head);
}

-void pci_setup_cardbus(struct pci_bus *bus)
+static void pci_setup_cardbus_window(struct pci_dev *bridge, char *type, int n,
+ struct resource *res, int base_reg, int limit_reg)
{
- struct pci_dev *bridge = bus->self;
- struct resource *res;
struct pci_bus_region region;
+ u32 base, limit;

- dev_info(&bridge->dev, "CardBus bridge to [bus %02x-%02x]\n",
- bus->secondary, bus->subordinate);
-
- res = bus->resource[0];
- pcibios_resource_to_bus(bridge, &region, res);
- if (res->flags & IORESOURCE_IO) {
+ if (!res) {
/*
- * The IO resource is allocated a range twice as large as it
- * would normally need. This allows us to set both IO regs.
+ * Maybe we should disable the window, but the previous
+ * code left it alone.
*/
- dev_info(&bridge->dev, " bridge window %pR\n", res);
- pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
- region.end);
+ pci_read_config_dword(bridge, base_reg, &base);
+ pci_read_config_dword(bridge, limit_reg, &limit);
+ dev_info(&bridge->dev, " no %s%d resource, leaving bridge programmed with base %#08x limit %#08x\n",
+ type, n, base, limit);
+ return;
}

- res = bus->resource[1];
pcibios_resource_to_bus(bridge, &region, res);
- if (res->flags & IORESOURCE_IO) {
- dev_info(&bridge->dev, " bridge window %pR\n", res);
- pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
- region.end);
- }
+ pci_write_config_dword(bridge, base_reg, region.start);
+ pci_write_config_dword(bridge, limit_reg, region.end);
+ dev_info(&bridge->dev, " bridge window %pR\n", res);
+}

- res = bus->resource[2];
- pcibios_resource_to_bus(bridge, &region, res);
- if (res->flags & IORESOURCE_MEM) {
- dev_info(&bridge->dev, " bridge window %pR\n", res);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
- region.end);
- }
+void pci_setup_cardbus(struct pci_bus *bus)
+{
+ struct pci_dev *bridge = bus->self;

- res = bus->resource[3];
- pcibios_resource_to_bus(bridge, &region, res);
- if (res->flags & IORESOURCE_MEM) {
- dev_info(&bridge->dev, " bridge window %pR\n", res);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
- region.start);
- pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
- region.end);
- }
+ dev_info(&bridge->dev, "CardBus bridge to [bus %02x-%02x]\n",
+ bus->secondary, bus->subordinate);
+
+ /*
+ * The IO resource is allocated a range twice as large as it
+ * would normally need. This allows us to set both IO regs.
+ */
+ pci_setup_cardbus_window(bridge, "io", 0,
+ pci_bus_get_resource(bus, IORESOURCE_IO, 0),
+ PCI_CB_IO_BASE_0, PCI_CB_IO_LIMIT_0);
+ pci_setup_cardbus_window(bridge, "io", 1,
+ pci_bus_get_resource(bus, IORESOURCE_IO, 1),
+ PCI_CB_IO_BASE_1, PCI_CB_IO_LIMIT_1);
+ pci_setup_cardbus_window(bridge, "mem", 0,
+ pci_bus_get_resource(bus, IORESOURCE_MEM, 0),
+ PCI_CB_MEMORY_BASE_0, PCI_CB_MEMORY_LIMIT_0);
+ pci_setup_cardbus_window(bridge, "mem", 1,
+ pci_bus_get_resource(bus, IORESOURCE_MEM, 1),
+ PCI_CB_MEMORY_BASE_1, PCI_CB_MEMORY_LIMIT_1);
}
EXPORT_SYMBOL(pci_setup_cardbus);

@@ -212,9 +207,9 @@ static void pci_setup_bridge_io(struct pci_bus *bus)
u32 l, io_upper16;

/* Set up the top and bottom of the PCI I/O segment for this bus. */
- res = bus->resource[0];
- pcibios_resource_to_bus(bridge, &region, res);
- if (res->flags & IORESOURCE_IO) {
+ res = pci_bus_get_resource(bus, IORESOURCE_IO, 0);
+ if (res) {
+ pcibios_resource_to_bus(bridge, &region, res);
pci_read_config_dword(bridge, PCI_IO_BASE, &l);
l &= 0xffff0000;
l |= (region.start >> 8) & 0x00f0;
@@ -244,9 +239,9 @@ static void pci_setup_bridge_mmio(struct pci_bus *bus)
u32 l;

/* Set up the top and bottom of the PCI Memory segment for this bus. */
- res = bus->resource[1];
- pcibios_resource_to_bus(bridge, &region, res);
- if (res->flags & IORESOURCE_MEM) {
+ res = pci_bus_get_resource(bus, IORESOURCE_MEM, 0);
+ if (res) {
+ pcibios_resource_to_bus(bridge, &region, res);
l = (region.start >> 16) & 0xfff0;
l |= region.end & 0xfff00000;
dev_info(&bridge->dev, " bridge window %pR\n", res);
@@ -271,9 +266,9 @@ static void pci_setup_bridge_mmio_pref(struct pci_bus *bus)

/* Set up PREF base/limit. */
bu = lu = 0;
- res = bus->resource[2];
- pcibios_resource_to_bus(bridge, &region, res);
- if (res->flags & IORESOURCE_PREFETCH) {
+ res = pci_bus_get_resource(bus, IORESOURCE_MEM | IORESOURCE_PREFETCH, 0);
+ if (res) {
+ pcibios_resource_to_bus(bridge, &region, res);
l = (region.start >> 16) & 0xfff0;
l |= region.end & 0xfff00000;
if (res->flags & IORESOURCE_MEM_64) {
@@ -382,13 +377,13 @@ static void pci_bridge_check_ranges(struct pci_bus *bus)
have non-NULL parent resource). */
static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
{
- int i;
+ struct pci_bus_resource *bus_res;
struct resource *r;
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;

- for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
- r = bus->resource[i];
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ r = bus_res->res;
if (r == &ioport_resource || r == &iomem_resource)
continue;
if (r && (r->flags & type_mask) == type && !r->parent)
@@ -803,15 +798,15 @@ static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,

static void pci_bus_dump_res(struct pci_bus *bus)
{
- int i;
+ struct pci_bus_resource *bus_res;

- for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
- struct resource *res = bus->resource[i];
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ struct resource *res = bus_res->res;

if (!res || !res->end || !res->flags)
continue;

- dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
+ dev_printk(KERN_DEBUG, &bus->dev, "resource %pR\n", res);
}
}

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 45d75dc..cd15c51 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -786,8 +786,9 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
#ifdef CONFIG_PCI
static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
{
+ struct pci_bus_resource *bus_res;
struct resource *res;
- int i, done = 0;
+ int done = 0;

if (!s->cb_dev || !s->cb_dev->bus)
return -ENODEV;
@@ -803,8 +804,8 @@ static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
return -EINVAL;
#endif

- for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
- res = s->cb_dev->bus->resource[i];
+ list_for_each_entry(bus_res, &s->cb_dev->bus->resources, list) {
+ res = bus_res->res;
if (!res)
continue;

diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index e4d12ac..9c5a80e 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -649,9 +649,10 @@ static int yenta_search_one_res(struct resource *root, struct resource *res,
static int yenta_search_res(struct yenta_socket *socket, struct resource *res,
u32 min)
{
- int i;
- for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
- struct resource *root = socket->dev->bus->resource[i];
+ struct pci_bus_resource *bus_res;
+
+ list_for_each_entry(bus_res, &socket->dev->bus->resources, list) {
+ struct resource *root = bus_res->res;
if (!root)
continue;

diff --git a/include/linux/pci.h b/include/linux/pci.h
index df2a12f..44e2f0e 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -363,9 +363,13 @@ static inline void pci_add_saved_cap(struct pci_dev *pci_dev,
hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space);
}

-#ifndef PCI_BUS_NUM_RESOURCES
-#define PCI_BUS_NUM_RESOURCES 16
-#endif
+#define PCI_POSITIVE_DECODE 1
+
+struct pci_bus_resource {
+ struct list_head list;
+ struct resource *res;
+ unsigned int flags;
+};

#define PCI_REGION_FLAG_MASK 0x0fU /* These bits of resource flags tell us the PCI region flags */

@@ -376,8 +380,7 @@ struct pci_bus {
struct list_head devices; /* list of devices on this bus */
struct pci_dev *self; /* bridge device as seen by parent */
struct list_head slots; /* list of slots on this bus */
- struct resource *resource[PCI_BUS_NUM_RESOURCES];
- /* address space routed to this bus */
+ struct list_head resources; /* address space routed to this bus */

struct pci_ops *ops; /* configuration access functions */
void *sysdata; /* hook for sys-specific extension */
@@ -828,6 +831,9 @@ int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
void pci_release_selected_regions(struct pci_dev *, int);

/* drivers/pci/bus.c */
+void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned int flags);
+struct resource *pci_bus_get_resource(struct pci_bus *bus, unsigned long flags, int num);
+void pci_bus_remove_resources(struct pci_bus *bus);
int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
struct resource *res, resource_size_t size,
resource_size_t align, resource_size_t min,

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