[PATCH v3 0/7] PCI: try "pci=use_crs" again

[PATCH v3 0/7] PCI: try "pci=use_crs" again

[Bjorn Helgaas]

Historically, Linux has assumed a single PCI host bridge, with that bridge
claiming all the address space left after RAM and legacy devices are taken out.

If the system contains multiple host bridges, we can no longer operate under
that assumption.  We have to know what parts of the address space are claimed
by each bridge so that when we assign resources to a PCI device, we take them
from a range claimed by the upstream host bridge.

On x86 and ia64, we use ACPI to enumerate all the PCI host bridges in the
system, and part of the host bridge description is the "_CRS" (current resource
settings" property, which lists the address space used by the bridge.  On x86,
we currently ignore most of the _CRS information.  This patch series changes
this, so we will use _CRS to learn about the host bridge windows.

Since most x86 machines with multiple host bridges are relatively new, this
series only turns this on for machines with BIOS dates of 2008 or newer.

Changes from v2 to v3:
    - Fix alpha, powerpc, and mn10300 references to pci_bus resource table
    - Turn on "pci=use_crs" for 2008 and newer, not 2010 and newer
    - Remove Toshiba A355 quirk (BIOS date is 2009, so automatically included)
    - Remove IBM x3850 and x3950 quirks (BIOS dates in 2008, so automatically
      included)
    - Leave IBM x3800 quirk (pre-2008 BIOS)
    - Use "bool" for pci_use_crs (new to me, but I see akpm suggesting it)
    - Reorder so the important patches are first

Changes from v1 to v2:
    - Rebase to be6e9f7853e
    - Add patch to clean up "disabled window" printk
    - Add bugzilla reference comment in use_crs DMI quirk

---

Bjorn Helgaas (7):
      PCI: split up pci_read_bridge_bases()
      PCI: read bridge windows before filling in subtractive decode resources
      PCI: replace bus resource table with a list
      x86/PCI: use host bridge _CRS info by default on 2008 and newer machines
      PCI: make disabled window printk style match the enabled ones
      PCI: break out primary/secondary/subordinate for readability
      PCI: reference bridge window resources explicitly


 Documentation/kernel-parameters.txt  |    8 +-
 arch/alpha/kernel/pci.c              |    5 +
 arch/ia64/include/asm/acpi.h         |    1 
 arch/ia64/pci/pci.c                  |   20 ++--
 arch/mn10300/unit-asb2305/pci.c      |    7 +
 arch/powerpc/kernel/pci-common.c     |   26 +++--
 arch/powerpc/kernel/pci_64.c         |   18 ++--
 arch/powerpc/kernel/pci_of_scan.c    |   12 ++
 arch/powerpc/platforms/fsl_uli1575.c |   15 ++-
 arch/x86/include/asm/pci_x86.h       |    1 
 arch/x86/pci/acpi.c                  |   82 ++++++++++-------
 arch/x86/pci/bus_numa.c              |    9 +-
 arch/x86/pci/bus_numa.h              |    3 -
 arch/x86/pci/common.c                |    3 +
 drivers/acpi/pci_root.c              |    1 
 drivers/eisa/pci_eisa.c              |    4 -
 drivers/pci/bus.c                    |   50 ++++++++++
 drivers/pci/hotplug/shpchp_sysfs.c   |   15 ++-
 drivers/pci/pci.c                    |    6 +
 drivers/pci/probe.c                  |  108 +++++++++++++++-------
 drivers/pci/quirks.c                 |    4 -
 drivers/pci/setup-bus.c              |  168 +++++++++++++++++-----------------
 drivers/pcmcia/rsrc_nonstatic.c      |    7 +
 drivers/pcmcia/yenta_socket.c        |   46 +++++----
 include/acpi/acpi_drivers.h          |    1 
 include/linux/pci.h                  |   27 ++++-
 26 files changed, 401 insertions(+), 246 deletions(-)

[PATCH v3 1/7] PCI: split up pci_read_bridge_bases()

[Bjorn Helgaas]

No functional change; this breaks up pci_read_bridge_bases() into separate
pieces for the I/O, memory, and prefetchable memory windows, similar to how
Yinghai recently split up pci_setup_bridge() in 68e84ff3bdc.

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

 drivers/pci/probe.c |   54 +++++++++++++++++++++++++++++++++++++--------------
 1 files changed, 39 insertions(+), 15 deletions(-)


diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index d300943..3d305c1 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -281,26 +281,12 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
 	}
 }
 
-void __devinit pci_read_bridge_bases(struct pci_bus *child)
+static void __devinit pci_read_bridge_io(struct pci_bus *child)
 {
 	struct pci_dev *dev = child->self;
 	u8 io_base_lo, io_limit_lo;
-	u16 mem_base_lo, mem_limit_lo;
 	unsigned long base, limit;
 	struct resource *res;
-	int i;
-
-	if (pci_is_root_bus(child))	/* It's a host bus, nothing to read */
-		return;
-
-	dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n",
-		 child->secondary, child->subordinate,
-		 dev->transparent ? " (subtractive decode)": "");
-
-	if (dev->transparent) {
-		for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
-			child->resource[i] = child->parent->resource[i - 3];
-	}
 
 	res = child->resource[0];
 	pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
@@ -328,6 +314,14 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
 			 "  bridge window [io  %04lx - %04lx] reg reading\n",
 				 base, limit);
 	}
+}
+
+static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
+{
+	struct pci_dev *dev = child->self;
+	u16 mem_base_lo, mem_limit_lo;
+	unsigned long base, limit;
+	struct resource *res;
 
 	res = child->resource[1];
 	pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
@@ -344,6 +338,14 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
 			"  bridge window [mem 0x%08lx - 0x%08lx] reg reading\n",
 					 base, limit + 0xfffff);
 	}
+}
+
+static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
+{
+	struct pci_dev *dev = child->self;
+	u16 mem_base_lo, mem_limit_lo;
+	unsigned long base, limit;
+	struct resource *res;
 
 	res = child->resource[2];
 	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
@@ -389,6 +391,28 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
 	}
 }
 
+void __devinit pci_read_bridge_bases(struct pci_bus *child)
+{
+	struct pci_dev *dev = child->self;
+	int i;
+
+	if (pci_is_root_bus(child))	/* It's a host bus, nothing to read */
+		return;
+
+	dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n",
+		 child->secondary, child->subordinate,
+		 dev->transparent ? " (subtractive decode)": "");
+
+	if (dev->transparent) {
+		for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
+			child->resource[i] = child->parent->resource[i - 3];
+	}
+
+	pci_read_bridge_io(child);
+	pci_read_bridge_mmio(child);
+	pci_read_bridge_mmio_pref(child);
+}
+
 static struct pci_bus * pci_alloc_bus(void)
 {
 	struct pci_bus *b;

[PATCH v3 2/7] PCI: read bridge windows before filling in subtractive decode resources

[Bjorn Helgaas]

No functional change; this fills in the bus subtractive decode resources
after reading the bridge window information rather than before.  Also,
print out the subtractive decode resources as we already do for the
positive decode windows.

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

 drivers/pci/probe.c |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)


diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3d305c1..06ff76d 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -403,14 +403,19 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
 		 child->secondary, child->subordinate,
 		 dev->transparent ? " (subtractive decode)": "");
 
-	if (dev->transparent) {
-		for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
-			child->resource[i] = child->parent->resource[i - 3];
-	}
-
 	pci_read_bridge_io(child);
 	pci_read_bridge_mmio(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]);
+		}
+	}
 }
 
 static struct pci_bus * pci_alloc_bus(void)

[PATCH v3 3/7] PCI: replace bus resource table with a list

[Bjorn Helgaas]

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@hp.com>
---

 arch/alpha/kernel/pci.c              |    5 +-
 arch/ia64/pci/pci.c                  |   20 ++----
 arch/mn10300/unit-asb2305/pci.c      |    7 +-
 arch/powerpc/kernel/pci-common.c     |   26 +++++---
 arch/powerpc/kernel/pci_64.c         |   18 +++---
 arch/powerpc/kernel/pci_of_scan.c    |    7 +-
 arch/powerpc/platforms/fsl_uli1575.c |   15 +++--
 arch/x86/pci/acpi.c                  |   33 +---------
 arch/x86/pci/bus_numa.c              |    9 ++-
 arch/x86/pci/bus_numa.h              |    3 -
 drivers/eisa/pci_eisa.c              |    4 +
 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 +++--
 19 files changed, 219 insertions(+), 175 deletions(-)


diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
index c9ab94e..e4bb1f3 100644
--- a/arch/alpha/kernel/pci.c
+++ b/arch/alpha/kernel/pci.c
@@ -292,8 +292,9 @@ pcibios_fixup_bus(struct pci_bus *bus)
 		u32 sg_base = hose->sg_pci ? hose->sg_pci->dma_base : ~0;
 		unsigned long end;
 
-		bus->resource[0] = hose->io_space;
-		bus->resource[1] = hose->mem_space;
+		pci_bus_remove_resources(bus);
+		pci_bus_add_resource(bus, hose->io_space, 0);
+		pci_bus_add_resource(bus, hose->mem_space, 0);
 
 		/* Adjust hose mem_space limit to prevent PCI allocations
 		   in the iommu windows. */
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/mn10300/unit-asb2305/pci.c b/arch/mn10300/unit-asb2305/pci.c
index 2cb7e75..187adcc 100644
--- a/arch/mn10300/unit-asb2305/pci.c
+++ b/arch/mn10300/unit-asb2305/pci.c
@@ -332,12 +332,13 @@ static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
 {
 	unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
 	struct resource *devr = &dev->resource[idx];
+	struct pci_bus_resource *bus_res;
 
 	if (dev->bus) {
-		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)
+			if ((busr->flags ^ devr->flags) & type_mask)
 				continue;
 
 			if (devr->start &&
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index e640810..d75546e 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -1042,14 +1042,15 @@ static int __devinit pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
 /* Fixup resources of a PCI<->PCI bridge */
 static void __devinit pcibios_fixup_bridge(struct pci_bus *bus)
 {
+	struct pci_bus_resource *bus_res;
 	struct resource *res;
-	int i;
+	int i = -1;
 
 	struct pci_dev *dev = bus->self;
 
-	for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
-		if ((res = bus->resource[i]) == NULL)
-			continue;
+	list_for_each_entry(bus_res, &bus->resources, list) {
+		i++;
+		res = bus_res->res;
 		if (!res->flags)
 			continue;
 		if (i >= 3 && bus->self->transparent)
@@ -1271,15 +1272,17 @@ static int reparent_resources(struct resource *parent,
 void pcibios_allocate_bus_resources(struct pci_bus *bus)
 {
 	struct pci_bus *b;
-	int i;
+	int i = -1;
+	struct pci_bus_resource *bus_res;
 	struct resource *res, *pr;
 
 	pr_debug("PCI: Allocating bus resources for %04x:%02x...\n",
 		 pci_domain_nr(bus), bus->number);
 
-	for (i = 0; i < PCI_BUS_NUM_RESOURCES; ++i) {
-		if ((res = bus->resource[i]) == NULL || !res->flags
-		    || res->start > res->end || res->parent)
+	list_for_each_entry(bus_res, &bus->resources, list) {
+		i++;
+		res = bus_res->res;
+		if (!res->flags || res->start > res->end || res->parent)
 			continue;
 		if (bus->parent == NULL)
 			pr = (res->flags & IORESOURCE_IO) ?
@@ -1579,8 +1582,11 @@ void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
 	struct resource *res;
 	int i;
 
+	pci_bus_remove_resources(bus);
+
 	/* Hookup PHB IO resource */
-	bus->resource[0] = res = &hose->io_resource;
+	res = &hose->io_resource;
+	pci_bus_add_resource(bus, res, 0);
 
 	if (!res->flags) {
 		printk(KERN_WARNING "PCI: I/O resource not set for host"
@@ -1615,7 +1621,7 @@ void __devinit pcibios_setup_phb_resources(struct pci_controller *hose)
 			res->flags = IORESOURCE_MEM;
 #endif /* CONFIG_PPC32 */
 		}
-		bus->resource[i+1] = res;
+		pci_bus_add_resource(bus, res, 0);
 
 		pr_debug("PCI: PHB MEM resource %d = %016llx-%016llx [%lx]\n", i,
 			 (unsigned long long)res->start,
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index ccf56ac..155a2bf 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -82,6 +82,7 @@ subsys_initcall(pcibios_init);
 
 int pcibios_unmap_io_space(struct pci_bus *bus)
 {
+	struct pci_dev *bridge = bus->self;
 	struct pci_controller *hose;
 
 	WARN_ON(bus == NULL);
@@ -96,13 +97,13 @@ int pcibios_unmap_io_space(struct pci_bus *bus)
 	 * Note: If we ever support P2P hotplug on Book3E, we'll have
 	 * to do an appropriate TLB flush here too
 	 */
-	if (bus->self) {
+	if (bridge) {
 #ifdef CONFIG_PPC_STD_MMU_64
-		struct resource *res = bus->resource[0];
+		struct resource *res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0];
 #endif
 
 		pr_debug("IO unmapping for PCI-PCI bridge %s\n",
-			 pci_name(bus->self));
+			 pci_name(bridge));
 
 #ifdef CONFIG_PPC_STD_MMU_64
 		__flush_hash_table_range(&init_mm, res->start + _IO_BASE,
@@ -132,6 +133,7 @@ EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
 
 int __devinit pcibios_map_io_space(struct pci_bus *bus)
 {
+	struct pci_dev *bridge = bus->self;
 	struct vm_struct *area;
 	unsigned long phys_page;
 	unsigned long size_page;
@@ -143,12 +145,14 @@ int __devinit pcibios_map_io_space(struct pci_bus *bus)
 	/* If this not a PHB, nothing to do, page tables still exist and
 	 * thus HPTEs will be faulted in when needed
 	 */
-	if (bus->self) {
+	if (bridge) {
+		struct resource *res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0];
+
 		pr_debug("IO mapping for PCI-PCI bridge %s\n",
-			 pci_name(bus->self));
+			 pci_name(bridge));
 		pr_debug("  virt=0x%016llx...0x%016llx\n",
-			 bus->resource[0]->start + _IO_BASE,
-			 bus->resource[0]->end + _IO_BASE);
+			 res->start + _IO_BASE,
+			 res->end + _IO_BASE);
 		return 0;
 	}
 
diff --git a/arch/powerpc/kernel/pci_of_scan.c b/arch/powerpc/kernel/pci_of_scan.c
index 4aa1740..521ad52 100644
--- a/arch/powerpc/kernel/pci_of_scan.c
+++ b/arch/powerpc/kernel/pci_of_scan.c
@@ -242,10 +242,11 @@ void __devinit of_scan_pci_bridge(struct device_node *node,
 
 	/* parse ranges property */
 	/* PCI #address-cells == 3 and #size-cells == 2 always */
+	pci_bus_remove_resources(bus);
 	res = &dev->resource[PCI_BRIDGE_RESOURCES];
 	for (i = 0; i < PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES; ++i) {
 		res->flags = 0;
-		bus->resource[i] = res;
+		pci_bus_add_resource(bus, res, PCI_POSITIVE_DECODE);
 		++res;
 	}
 	i = 1;
@@ -255,7 +256,7 @@ void __devinit of_scan_pci_bridge(struct device_node *node,
 		if (flags == 0 || size == 0)
 			continue;
 		if (flags & IORESOURCE_IO) {
-			res = bus->resource[0];
+			res = &dev->resource[PCI_BRIDGE_RESOURCES + 0];
 			if (res->flags) {
 				printk(KERN_ERR "PCI: ignoring extra I/O range"
 				       " for bridge %s\n", node->full_name);
@@ -267,7 +268,7 @@ void __devinit of_scan_pci_bridge(struct device_node *node,
 				       " for bridge %s\n", node->full_name);
 				continue;
 			}
-			res = bus->resource[i];
+			res = &dev->resource[PCI_BRIDGE_RESOURCES + i];
 			++i;
 		}
 		res->start = of_read_number(&ranges[1], 2);
diff --git a/arch/powerpc/platforms/fsl_uli1575.c b/arch/powerpc/platforms/fsl_uli1575.c
index fd23a1d..04c546f 100644
--- a/arch/powerpc/platforms/fsl_uli1575.c
+++ b/arch/powerpc/platforms/fsl_uli1575.c
@@ -222,6 +222,8 @@ static void __devinit quirk_final_uli5249(struct pci_dev *dev)
 	int i;
 	u8 *dummy;
 	struct pci_bus *bus = dev->bus;
+	struct pci_bus_resource *bus_res;
+	struct resource *res;
 	resource_size_t end = 0;
 
 	for (i = PCI_BRIDGE_RESOURCES; i < PCI_BRIDGE_RESOURCES+3; i++) {
@@ -230,13 +232,14 @@ static void __devinit quirk_final_uli5249(struct pci_dev *dev)
 			end = pci_resource_end(dev, i);
 	}
 
-	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
-		if ((bus->resource[i]) &&
-			(bus->resource[i]->flags & IORESOURCE_MEM)) {
-			if (bus->resource[i]->end == end)
-				dummy = ioremap(bus->resource[i]->start, 0x4);
+	list_for_each_entry(bus_res, &bus->resources, list) {
+		res = bus_res->res;
+
+		if (res->flags & IORESOURCE_MEM) {
+			if (res->end == end)
+				dummy = ioremap(res->start, 0x4);
 			else
-				dummy = ioremap(bus->resource[i]->end - 3, 0x4);
+				dummy = ioremap(res->end - 3, 0x4);
 			if (dummy) {
 				in_8(dummy);
 				iounmap(dummy);
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/arch/x86/pci/bus_numa.h b/arch/x86/pci/bus_numa.h
index adbc23f..731b64e 100644
--- a/arch/x86/pci/bus_numa.h
+++ b/arch/x86/pci/bus_numa.h
@@ -2,8 +2,7 @@
 
 /*
  * sub bus (transparent) will use entres from 3 to store extra from
- * root, so need to make sure we have enough slot there, Should we
- * increase PCI_BUS_NUM_RESOURCES?
+ * root, so need to make sure we have enough slot there.
  */
 #define RES_NUM 16
 struct pci_root_info {
diff --git a/drivers/eisa/pci_eisa.c b/drivers/eisa/pci_eisa.c
index 0dd0f63..562eaa4 100644
--- a/drivers/eisa/pci_eisa.c
+++ b/drivers/eisa/pci_eisa.c
@@ -31,8 +31,8 @@ static int __init pci_eisa_init(struct pci_dev *pdev,
 	}
 
 	pci_eisa_root.dev              = &pdev->dev;
-	pci_eisa_root.res	       = pdev->bus->resource[0];
-	pci_eisa_root.bus_base_addr    = pdev->bus->resource[0]->start;
+	pci_eisa_root.res	       = &pdev->resource[PCI_BRIDGE_RESOURCES + 0];
+	pci_eisa_root.bus_base_addr    = pdev->resource[PCI_BRIDGE_RESOURCES + 0].start;
 	pci_eisa_root.slots	       = EISA_MAX_SLOTS;
 	pci_eisa_root.dma_mask         = pdev->dma_mask;
 	dev_set_drvdata(pci_eisa_root.dev, &pci_eisa_root);
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 06ff76d..c5ecd3c 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;
@@ -1445,8 +1452,8 @@ 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,

[PATCH v3 4/7] x86/PCI: use host bridge _CRS info by default on 2008 and newer machines

[Bjorn Helgaas]

The main benefit of using ACPI host bridge window information is that
we can do better resource allocation in systems with multiple host bridges,
e.g., http://bugzilla.kernel.org/show_bug.cgi?id=14183

Sometimes we need _CRS information even if we only have one host bridge,
e.g., https://bugs.launchpad.net/ubuntu/+source/linux/+bug/341681

Most of these systems are relatively new, so this patch turns on
"pci=use_crs" only on machines with a BIOS date of 2008 or newer.

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

 Documentation/kernel-parameters.txt |    8 ++++-
 arch/ia64/include/asm/acpi.h        |    1 +
 arch/x86/include/asm/pci_x86.h      |    1 +
 arch/x86/pci/acpi.c                 |   53 +++++++++++++++++++++++++++++++----
 arch/x86/pci/common.c               |    3 ++
 drivers/acpi/pci_root.c             |    1 +
 include/acpi/acpi_drivers.h         |    1 +
 7 files changed, 60 insertions(+), 8 deletions(-)


diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 01e2a98..6913e9a 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1939,8 +1939,12 @@ and is between 256 and 4096 characters. It is defined in the file
 				IRQ routing is enabled.
 		noacpi		[X86] Do not use ACPI for IRQ routing
 				or for PCI scanning.
-		use_crs		[X86] Use _CRS for PCI resource
-				allocation.
+		use_crs		[X86] Use PCI host bridge window information
+				from ACPI.  On BIOSes from 2008 or later, this
+				is enabled by default.  If you need to use this,
+				please report a bug.
+		nocrs		[X86] Ignore PCI host bridge windows from ACPI.
+			        If you need to use this, please report a bug.
 		routeirq	Do IRQ routing for all PCI devices.
 				This is normally done in pci_enable_device(),
 				so this option is a temporary workaround
diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
index 7ae5889..7f2d7f2 100644
--- a/arch/ia64/include/asm/acpi.h
+++ b/arch/ia64/include/asm/acpi.h
@@ -97,6 +97,7 @@ ia64_acpi_release_global_lock (unsigned int *lock)
 #endif
 #define acpi_processor_cstate_check(x) (x) /* no idle limits on IA64 :) */
 static inline void disable_acpi(void) { }
+static inline void pci_acpi_crs_quirks(void) { }
 
 const char *acpi_get_sysname (void);
 int acpi_request_vector (u32 int_type);
diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index b4bf9a9..05b58cc 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -29,6 +29,7 @@
 #define PCI_CHECK_ENABLE_AMD_MMCONF	0x20000
 #define PCI_HAS_IO_ECS		0x40000
 #define PCI_NOASSIGN_ROMS	0x80000
+#define PCI_ROOT_NO_CRS		0x100000
 
 extern unsigned int pci_probe;
 extern unsigned long pirq_table_addr;
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index a2f8cdb..5f11ff6 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -15,6 +15,51 @@ struct pci_root_info {
 	int busnum;
 };
 
+static bool pci_use_crs = true;
+
+static int __init set_use_crs(const struct dmi_system_id *id)
+{
+	pci_use_crs = true;
+	return 0;
+}
+
+static const struct dmi_system_id pci_use_crs_table[] __initconst = {
+	/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
+	{
+		.callback = set_use_crs,
+		.ident = "IBM System x3800",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
+		},
+	},
+	{}
+};
+
+void __init pci_acpi_crs_quirks(void)
+{
+	int year;
+
+	if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
+		pci_use_crs = false;
+
+	dmi_check_system(pci_use_crs_table);
+
+	/*
+	 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
+	 * takes precedence over anything we figured out above.
+	 */
+	if (pci_probe & PCI_ROOT_NO_CRS)
+		pci_use_crs = false;
+	else if (pci_probe & PCI_USE__CRS)
+		pci_use_crs = true;
+
+	printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
+	       "if necessary, use \"pci=%s\" and report a bug\n",
+	       pci_use_crs ? "Using" : "Ignoring",
+	       pci_use_crs ? "nocrs" : "use_crs");
+}
+
 static acpi_status
 resource_to_addr(struct acpi_resource *resource,
 			struct acpi_resource_address64 *addr)
@@ -106,7 +151,7 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
 	res->child = NULL;
 	align_resource(info->bridge, res);
 
-	if (!(pci_probe & PCI_USE__CRS)) {
+	if (!pci_use_crs) {
 		dev_printk(KERN_DEBUG, &info->bridge->dev,
 			   "host bridge window %pR (ignored)\n", res);
 		return AE_OK;
@@ -137,12 +182,8 @@ 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_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");
 
 	info.bridge = device;
 	info.bus = bus;
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index d2552c6..3736176 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -520,6 +520,9 @@ char * __devinit  pcibios_setup(char *str)
 	} else if (!strcmp(str, "use_crs")) {
 		pci_probe |= PCI_USE__CRS;
 		return NULL;
+	} else if (!strcmp(str, "nocrs")) {
+		pci_probe |= PCI_ROOT_NO_CRS;
+		return NULL;
 	} else if (!strcmp(str, "earlydump")) {
 		pci_early_dump_regs = 1;
 		return NULL;
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 64ae2f2..4a46051 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -566,6 +566,7 @@ static int __init acpi_pci_root_init(void)
 	if (acpi_pci_disabled)
 		return 0;
 
+	pci_acpi_crs_quirks();
 	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
 		return -ENODEV;
 
diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h
index f4906f6..3a4767c 100644
--- a/include/acpi/acpi_drivers.h
+++ b/include/acpi/acpi_drivers.h
@@ -104,6 +104,7 @@ int acpi_pci_bind_root(struct acpi_device *device);
 
 struct pci_bus *pci_acpi_scan_root(struct acpi_device *device, int domain,
 				   int bus);
+void pci_acpi_crs_quirks(void);
 
 /* --------------------------------------------------------------------------
                                     Processor

[PATCH v3 5/7] PCI: make disabled window printk style match the enabled ones

[Bjorn Helgaas]

No functional change; this just tweaks the changes from 349e1823a405
so the new printks for disabled PCI-to-PCI bridge windows match the
ones for the enabled windows.

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

 drivers/pci/probe.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)


diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index c5ecd3c..dacdeae 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -313,7 +313,7 @@ static void __devinit pci_read_bridge_io(struct pci_bus *child)
 		dev_printk(KERN_DEBUG, &dev->dev, "  bridge window %pR\n", res);
 	} else {
 		dev_printk(KERN_DEBUG, &dev->dev,
-			 "  bridge window [io  %04lx - %04lx] reg reading\n",
+			 "  bridge window [io  %#06lx-%#06lx] (disabled)\n",
 				 base, limit);
 	}
 }
@@ -338,7 +338,7 @@ static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
 		dev_printk(KERN_DEBUG, &dev->dev, "  bridge window %pR\n", res);
 	} else {
 		dev_printk(KERN_DEBUG, &dev->dev,
-			"  bridge window [mem 0x%08lx - 0x%08lx] reg reading\n",
+			"  bridge window [mem %#010lx-%#010lx] (disabled)\n",
 					 base, limit + 0xfffff);
 	}
 }
@@ -390,7 +390,7 @@ static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
 		dev_printk(KERN_DEBUG, &dev->dev, "  bridge window %pR\n", res);
 	} else {
 		dev_printk(KERN_DEBUG, &dev->dev,
-		     "  bridge window [mem 0x%08lx - %08lx pref] reg reading\n",
+		     "  bridge window [mem %#010lx-%#010lx pref] (disabled)\n",
 					 base, limit + 0xfffff);
 	}
 }

[PATCH v3 6/7] PCI: break out primary/secondary/subordinate for readability

[Bjorn Helgaas]

No functional change; just add names for the primary/secondary/subordinate
bus numbers read from config space rather than repeatedly masking/shifting.

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

 drivers/pci/probe.c |   24 ++++++++++++++----------
 1 files changed, 14 insertions(+), 10 deletions(-)


diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index dacdeae..04e7e97 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -671,16 +671,20 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
 	int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
 	u32 buses, i, j = 0;
 	u16 bctl;
+	u8 primary, secondary, subordinate;
 	int broken = 0;
 
 	pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
+	primary = buses & 0xFF;
+	secondary = (buses >> 8) & 0xFF;
+	subordinate = (buses >> 16) & 0xFF;
 
-	dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
-		buses & 0xffffff, pass);
+	dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
+		secondary, subordinate, pass);
 
 	/* Check if setup is sensible at all */
 	if (!pass &&
-	    ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
+	    (primary != bus->number || secondary <= bus->number)) {
 		dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
 		broken = 1;
 	}
@@ -691,15 +695,15 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
 	pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
 			      bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
 
-	if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
-		unsigned int cmax, busnr;
+	if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
+	    !is_cardbus && !broken) {
+		unsigned int cmax;
 		/*
 		 * Bus already configured by firmware, process it in the first
 		 * pass and just note the configuration.
 		 */
 		if (pass)
 			goto out;
-		busnr = (buses >> 8) & 0xFF;
 
 		/*
 		 * If we already got to this bus through a different bridge,
@@ -708,13 +712,13 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
 		 * However, we continue to descend down the hierarchy and
 		 * scan remaining child buses.
 		 */
-		child = pci_find_bus(pci_domain_nr(bus), busnr);
+		child = pci_find_bus(pci_domain_nr(bus), secondary);
 		if (!child) {
-			child = pci_add_new_bus(bus, dev, busnr);
+			child = pci_add_new_bus(bus, dev, secondary);
 			if (!child)
 				goto out;
-			child->primary = buses & 0xFF;
-			child->subordinate = (buses >> 16) & 0xFF;
+			child->primary = primary;
+			child->subordinate = subordinate;
 			child->bridge_ctl = bctl;
 		}
 

[PATCH v3 7/7] PCI: reference bridge window resources explicitly

[Bjorn Helgaas]

No functional change; just be more explicit about this mapping for
bridge resources:

  bridge->res[PCI_BRIDGE_RESOURCES+0]: I/O window (or CB I/O 0 window)
  bridge->res[PCI_BRIDGE_RESOURCES+1]: mem window (or CB I/O 1 window)
  bridge->res[PCI_BRIDGE_RESOURCES+2]: pref mem window (or CB mem 0 window)
  bridge->res[PCI_BRIDGE_RESOURCES+3]: CB mem 1 window

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

 arch/powerpc/kernel/pci_64.c      |    4 +--
 arch/powerpc/kernel/pci_of_scan.c |    9 ++++--
 drivers/pci/probe.c               |    6 ++--
 drivers/pci/quirks.c              |    4 +--
 drivers/pci/setup-bus.c           |   57 +++++++++++++++++++++----------------
 drivers/pcmcia/yenta_socket.c     |   39 +++++++++++++++----------
 include/linux/pci.h               |   11 ++++++-
 7 files changed, 78 insertions(+), 52 deletions(-)


diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index 155a2bf..044a4bd 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -99,7 +99,7 @@ int pcibios_unmap_io_space(struct pci_bus *bus)
 	 */
 	if (bridge) {
 #ifdef CONFIG_PPC_STD_MMU_64
-		struct resource *res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0];
+		struct resource *res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
 #endif
 
 		pr_debug("IO unmapping for PCI-PCI bridge %s\n",
@@ -146,7 +146,7 @@ int __devinit pcibios_map_io_space(struct pci_bus *bus)
 	 * thus HPTEs will be faulted in when needed
 	 */
 	if (bridge) {
-		struct resource *res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0];
+		struct resource *res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
 
 		pr_debug("IO mapping for PCI-PCI bridge %s\n",
 			 pci_name(bridge));
diff --git a/arch/powerpc/kernel/pci_of_scan.c b/arch/powerpc/kernel/pci_of_scan.c
index 521ad52..39487c3 100644
--- a/arch/powerpc/kernel/pci_of_scan.c
+++ b/arch/powerpc/kernel/pci_of_scan.c
@@ -256,19 +256,22 @@ void __devinit of_scan_pci_bridge(struct device_node *node,
 		if (flags == 0 || size == 0)
 			continue;
 		if (flags & IORESOURCE_IO) {
-			res = &dev->resource[PCI_BRIDGE_RESOURCES + 0];
+			res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
 			if (res->flags) {
 				printk(KERN_ERR "PCI: ignoring extra I/O range"
 				       " for bridge %s\n", node->full_name);
 				continue;
 			}
 		} else {
-			if (i >= PCI_NUM_RESOURCES - PCI_BRIDGE_RESOURCES) {
+			if (i == 1)
+				res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
+			else if (i == 2)
+				res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
+			else {
 				printk(KERN_ERR "PCI: too many memory ranges"
 				       " for bridge %s\n", node->full_name);
 				continue;
 			}
-			res = &dev->resource[PCI_BRIDGE_RESOURCES + i];
 			++i;
 		}
 		res->start = of_read_number(&ranges[1], 2);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 04e7e97..6d693fb 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -289,7 +289,7 @@ static void __devinit pci_read_bridge_io(struct pci_bus *child)
 	unsigned long base, limit;
 	struct resource *res;
 
-	res = &dev->resource[PCI_BRIDGE_RESOURCES + 0];
+	res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
 
 	pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
 	pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
@@ -325,7 +325,7 @@ static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
 	unsigned long base, limit;
 	struct resource *res;
 
-	res = &dev->resource[PCI_BRIDGE_RESOURCES + 1];
+	res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
 
 	pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
 	pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
@@ -350,7 +350,7 @@ static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
 	unsigned long base, limit;
 	struct resource *res;
 
-	res = &dev->resource[PCI_BRIDGE_RESOURCES + 2];
+	res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
 
 	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
 	pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 790eb69..197c6c6 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1907,7 +1907,7 @@ static void __devinit quirk_p64h2_1k_io(struct pci_dev *dev)
 	u16 en1k;
 	u8 io_base_lo, io_limit_lo;
 	unsigned long base, limit;
-	struct resource *res = dev->resource + PCI_BRIDGE_RESOURCES;
+	struct resource *res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
 
 	pci_read_config_word(dev, 0x40, &en1k);
 
@@ -1934,7 +1934,7 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	0x1460,		quirk_p64h2_1k_io);
 static void __devinit quirk_p64h2_1k_io_fix_iobl(struct pci_dev *dev)
 {
 	u16 en1k, iobl_adr, iobl_adr_1k;
-	struct resource *res = dev->resource + PCI_BRIDGE_RESOURCES;
+	struct resource *res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
 
 	pci_read_config_word(dev, 0x40, &en1k);
 
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 8a3b512..182fe54 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -324,8 +324,7 @@ static void pci_bridge_check_ranges(struct pci_bus *bus)
 	struct pci_dev *bridge = bus->self;
 	struct resource *b_res;
 
-	b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
-	b_res[1].flags |= IORESOURCE_MEM;
+	bridge->resource[PCI_BRIDGE_MEM_WINDOW].flags |= IORESOURCE_MEM;
 
 	pci_read_config_word(bridge, PCI_IO_BASE, &io);
 	if (!io) {
@@ -334,12 +333,15 @@ static void pci_bridge_check_ranges(struct pci_bus *bus)
  		pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
  	}
  	if (io)
-		b_res[0].flags |= IORESOURCE_IO;
+		bridge->resource[PCI_BRIDGE_IO_WINDOW].flags |= IORESOURCE_IO;
+
 	/*  DECchip 21050 pass 2 errata: the bridge may miss an address
 	    disconnect boundary by one PCI data phase.
 	    Workaround: do not use prefetching on this device. */
 	if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
 		return;
+
+	b_res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
 	pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
 	if (!pmem) {
 		pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
@@ -348,16 +350,16 @@ static void pci_bridge_check_ranges(struct pci_bus *bus)
 		pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
 	}
 	if (pmem) {
-		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
+		b_res->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
 		if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
 		    PCI_PREF_RANGE_TYPE_64) {
-			b_res[2].flags |= IORESOURCE_MEM_64;
-			b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
+			b_res->flags |= IORESOURCE_MEM_64;
+			b_res->flags |= PCI_PREF_RANGE_TYPE_64;
 		}
 	}
 
 	/* double check if bridge does support 64 bit pref */
-	if (b_res[2].flags & IORESOURCE_MEM_64) {
+	if (b_res->flags & IORESOURCE_MEM_64) {
 		u32 mem_base_hi, tmp;
 		pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 					 &mem_base_hi);
@@ -365,7 +367,7 @@ static void pci_bridge_check_ranges(struct pci_bus *bus)
 					       0xffffffff);
 		pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
 		if (!tmp)
-			b_res[2].flags &= ~IORESOURCE_MEM_64;
+			b_res->flags &= ~IORESOURCE_MEM_64;
 		pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
 				       mem_base_hi);
 	}
@@ -544,20 +546,22 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 static void pci_bus_size_cardbus(struct pci_bus *bus)
 {
 	struct pci_dev *bridge = bus->self;
-	struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
+	struct resource *b_res;
 	u16 ctrl;
 
 	/*
 	 * Reserve some resources for CardBus.  We reserve
 	 * a fixed amount of bus space for CardBus bridges.
 	 */
-	b_res[0].start = 0;
-	b_res[0].end = pci_cardbus_io_size - 1;
-	b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
+	b_res = &bridge->resource[PCI_CB_BRIDGE_IO_0_WINDOW];
+	b_res->start = 0;
+	b_res->end = pci_cardbus_io_size - 1;
+	b_res->flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 
-	b_res[1].start = 0;
-	b_res[1].end = pci_cardbus_io_size - 1;
-	b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
+	b_res = &bridge->resource[PCI_CB_BRIDGE_IO_1_WINDOW];
+	b_res->start = 0;
+	b_res->end = pci_cardbus_io_size - 1;
+	b_res->flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 
 	/*
 	 * Check whether prefetchable memory is supported
@@ -576,17 +580,20 @@ static void pci_bus_size_cardbus(struct pci_bus *bus)
 	 * twice the size.
 	 */
 	if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
-		b_res[2].start = 0;
-		b_res[2].end = pci_cardbus_mem_size - 1;
-		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
-
-		b_res[3].start = 0;
-		b_res[3].end = pci_cardbus_mem_size - 1;
-		b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
+		b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_0_WINDOW];
+		b_res->start = 0;
+		b_res->end = pci_cardbus_mem_size - 1;
+		b_res->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
+
+		b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_1_WINDOW];
+		b_res->start = 0;
+		b_res->end = pci_cardbus_mem_size - 1;
+		b_res->flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 	} else {
-		b_res[3].start = 0;
-		b_res[3].end = pci_cardbus_mem_size * 2 - 1;
-		b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
+		b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_1_WINDOW];
+		b_res->start = 0;
+		b_res->end = pci_cardbus_mem_size * 2 - 1;
+		b_res->flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 	}
 }
 
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 9c5a80e..dc55592 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -673,7 +673,7 @@ static int yenta_allocate_res(struct yenta_socket *socket, int nr, unsigned type
 	struct pci_bus_region region;
 	unsigned mask;
 
-	res = dev->resource + PCI_BRIDGE_RESOURCES + nr;
+	res = &dev->resource[nr];
 	/* Already allocated? */
 	if (res->parent)
 		return 0;
@@ -690,7 +690,7 @@ static int yenta_allocate_res(struct yenta_socket *socket, int nr, unsigned type
 	region.end = config_readl(socket, addr_end) | ~mask;
 	if (region.start && region.end > region.start && !override_bios) {
 		pcibios_bus_to_resource(dev, res, &region);
-		if (pci_claim_resource(dev, PCI_BRIDGE_RESOURCES + nr) == 0)
+		if (pci_claim_resource(dev, nr) == 0)
 			return 0;
 		dev_printk(KERN_INFO, &dev->dev,
 			   "Preassigned resource %d busy or not available, "
@@ -731,32 +731,39 @@ static int yenta_allocate_res(struct yenta_socket *socket, int nr, unsigned type
 static void yenta_allocate_resources(struct yenta_socket *socket)
 {
 	int program = 0;
-	program += yenta_allocate_res(socket, 0, IORESOURCE_IO,
-			   PCI_CB_IO_BASE_0, PCI_CB_IO_LIMIT_0);
-	program += yenta_allocate_res(socket, 1, IORESOURCE_IO,
-			   PCI_CB_IO_BASE_1, PCI_CB_IO_LIMIT_1);
-	program += yenta_allocate_res(socket, 2, IORESOURCE_MEM|IORESOURCE_PREFETCH,
+	program += yenta_allocate_res(socket, PCI_CB_BRIDGE_IO_0_WINDOW,
+			   IORESOURCE_IO, PCI_CB_IO_BASE_0, PCI_CB_IO_LIMIT_0);
+	program += yenta_allocate_res(socket, PCI_CB_BRIDGE_IO_1_WINDOW,
+			   IORESOURCE_IO, PCI_CB_IO_BASE_1, PCI_CB_IO_LIMIT_1);
+	program += yenta_allocate_res(socket, PCI_CB_BRIDGE_MEM_0_WINDOW,
+			   IORESOURCE_MEM|IORESOURCE_PREFETCH,
 			   PCI_CB_MEMORY_BASE_0, PCI_CB_MEMORY_LIMIT_0);
-	program += yenta_allocate_res(socket, 3, IORESOURCE_MEM,
+	program += yenta_allocate_res(socket, PCI_CB_BRIDGE_MEM_1_WINDOW,
+			   IORESOURCE_MEM,
 			   PCI_CB_MEMORY_BASE_1, PCI_CB_MEMORY_LIMIT_1);
 	if (program)
 		pci_setup_cardbus(socket->dev->subordinate);
 }
 
+static void yenta_free_resource(struct yenta_socket *socket, int nr)
+{
+	struct resource *res;
+
+	res = &socket->dev->resource[nr];
+	if (res->start != 0 && res->end != 0)
+		release_resource(res);
+	res->start = res->end = res->flags = 0;
+}
 
 /*
  * Free the bridge mappings for the device..
  */
 static void yenta_free_resources(struct yenta_socket *socket)
 {
-	int i;
-	for (i = 0; i < 4; i++) {
-		struct resource *res;
-		res = socket->dev->resource + PCI_BRIDGE_RESOURCES + i;
-		if (res->start != 0 && res->end != 0)
-			release_resource(res);
-		res->start = res->end = res->flags = 0;
-	}
+	yenta_free_resource(socket, PCI_CB_BRIDGE_IO_0_WINDOW);
+	yenta_free_resource(socket, PCI_CB_BRIDGE_IO_1_WINDOW);
+	yenta_free_resource(socket, PCI_CB_BRIDGE_MEM_0_WINDOW);
+	yenta_free_resource(socket, PCI_CB_BRIDGE_MEM_1_WINDOW);
 }
 
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 44e2f0e..edcabd6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -101,7 +101,16 @@ enum {
 #endif
 
 	/* resources assigned to buses behind the bridge */
-#define PCI_BRIDGE_RESOURCE_NUM 4
+#define PCI_BRIDGE_IO_WINDOW		(PCI_BRIDGE_RESOURCES + 0)
+#define PCI_BRIDGE_MEM_WINDOW		(PCI_BRIDGE_RESOURCES + 1)
+#define PCI_BRIDGE_PREF_MEM_WINDOW	(PCI_BRIDGE_RESOURCES + 2)
+
+#define PCI_CB_BRIDGE_IO_0_WINDOW	(PCI_BRIDGE_RESOURCES + 0)
+#define PCI_CB_BRIDGE_IO_1_WINDOW	(PCI_BRIDGE_RESOURCES + 1)
+#define PCI_CB_BRIDGE_MEM_0_WINDOW	(PCI_BRIDGE_RESOURCES + 2)
+#define PCI_CB_BRIDGE_MEM_1_WINDOW	(PCI_BRIDGE_RESOURCES + 3)
+
+#define PCI_BRIDGE_RESOURCE_NUM 4	/* max of P2P, cardbus */
 
 	PCI_BRIDGE_RESOURCES,
 	PCI_BRIDGE_RESOURCE_END = PCI_BRIDGE_RESOURCES +

Re: [PATCH v3 1/7] PCI: split up pci_read_bridge_bases()

[Jesse Barnes]

On Fri, 12 Feb 2010 09:59:52 -0700
Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:

> 
> No functional change; this breaks up pci_read_bridge_bases() into
> separate pieces for the I/O, memory, and prefetchable memory windows,
> similar to how Yinghai recently split up pci_setup_bridge() in
> 68e84ff3bdc.
> 
> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
> ---

Applied to my linux-next branch replacing the old ones, thanks Bjorn.

-- 
Jesse Barnes, Intel Open Source Technology Center