[PATCH 0/7] PCI: hotplug bridge replated clean up

[PATCH 0/7] PCI: hotplug bridge replated clean up

[Yinghai Lu]

Reduce the open code with create bus/scan bus.
Make them more like updated pciehp driver.

Need to apply it before for-pci-busn_res

could be found at:
        git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-pci-hotplug

Yinghai Lu (7):
  PCI, pciehp: Separate pci_hp_add_bridge()
  PCI, cpci_hotplug: Simplify configure_slot
  PCI, shpchp: Simplify configure_device
  PCI, cpqhp: Using pci_hp_add_bridge
  PCI, ibmhp: Using pci_hp_add_bridge
  PCI, sgihp: Using pci_hp_add_bridge
  PCI, hotplug: remove pci_do_scan_bus()

 drivers/pci/hotplug-pci.c              |   30 +++++++++++++--------
 drivers/pci/hotplug/cpci_hotplug_pci.c |   35 ++++--------------------
 drivers/pci/hotplug/cpqphp_pci.c       |    8 +++---
 drivers/pci/hotplug/ibmphp_core.c      |    8 +++---
 drivers/pci/hotplug/pciehp_pci.c       |   28 +------------------
 drivers/pci/hotplug/sgi_hotplug.c      |   12 +++-----
 drivers/pci/hotplug/shpchp_pci.c       |   45 ++++++++++---------------------
 drivers/pci/pci.h                      |    2 +-
 8 files changed, 56 insertions(+), 112 deletions(-)

-- 
1.7.7

[PATCH 1/7] PCI, pciehp: Separate pci_hp_add_bridge()

[Yinghai Lu]

Will use it for other pci hp hotplug support

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/hotplug-pci.c        |   23 +++++++++++++++++++++++
 drivers/pci/hotplug/pciehp_pci.c |   28 ++--------------------------
 drivers/pci/pci.h                |    1 +
 3 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/drivers/pci/hotplug-pci.c b/drivers/pci/hotplug-pci.c
index d3509cd..1da0cae 100644
--- a/drivers/pci/hotplug-pci.c
+++ b/drivers/pci/hotplug-pci.c
@@ -4,6 +4,29 @@
 #include <linux/export.h>
 #include "pci.h"
 
+int __ref pci_hp_add_bridge(struct pci_dev *dev)
+{
+	struct pci_bus *parent = dev->bus;
+	int pass, busnr, start = parent->secondary;
+	int end = parent->subordinate;
+
+	for (busnr = start; busnr <= end; busnr++) {
+		if (!pci_find_bus(pci_domain_nr(parent), busnr))
+			break;
+	}
+	if (busnr-- > end) {
+		printk(KERN_ERR "No bus number available for hot-added bridge %s\n",
+				pci_name(dev));
+		return -1;
+	}
+	for (pass = 0; pass < 2; pass++)
+		busnr = pci_scan_bridge(parent, dev, busnr, pass);
+	if (!dev->subordinate)
+		return -1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_hp_add_bridge);
 
 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
 {
diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
index 47d9dc0..09cecaf 100644
--- a/drivers/pci/hotplug/pciehp_pci.c
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -34,29 +34,6 @@
 #include "../pci.h"
 #include "pciehp.h"
 
-static int __ref pciehp_add_bridge(struct pci_dev *dev)
-{
-	struct pci_bus *parent = dev->bus;
-	int pass, busnr, start = parent->secondary;
-	int end = parent->subordinate;
-
-	for (busnr = start; busnr <= end; busnr++) {
-		if (!pci_find_bus(pci_domain_nr(parent), busnr))
-			break;
-	}
-	if (busnr-- > end) {
-		err("No bus number available for hot-added bridge %s\n",
-				pci_name(dev));
-		return -1;
-	}
-	for (pass = 0; pass < 2; pass++)
-		busnr = pci_scan_bridge(parent, dev, busnr, pass);
-	if (!dev->subordinate)
-		return -1;
-
-	return 0;
-}
-
 int pciehp_configure_device(struct slot *p_slot)
 {
 	struct pci_dev *dev;
@@ -85,9 +62,8 @@ int pciehp_configure_device(struct slot *p_slot)
 		if (!dev)
 			continue;
 		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
-				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
-			pciehp_add_bridge(dev);
-		}
+				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
+			pci_hp_add_bridge(dev);
 		pci_dev_put(dev);
 	}
 
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index e494347..f3e14ce 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -124,6 +124,7 @@ static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
 #endif
 
 /* Functions for PCI Hotplug drivers to use */
+int pci_hp_add_bridge(struct pci_dev *dev);
 extern unsigned int pci_do_scan_bus(struct pci_bus *bus);
 
 #ifdef HAVE_PCI_LEGACY
-- 
1.7.7

[PATCH 2/7] PCI, cpci_hotplug: Simplify configure_slot

[Yinghai Lu]

For child p2p bridge hotplug support should use pci_scan_bridge instead.

Make it more simillar to pciehp, just use pci_hp_add_bridge()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/hotplug/cpci_hotplug_pci.c |   35 +++++--------------------------
 1 files changed, 6 insertions(+), 29 deletions(-)

diff --git a/drivers/pci/hotplug/cpci_hotplug_pci.c b/drivers/pci/hotplug/cpci_hotplug_pci.c
index ae853cc..dcc75c7 100644
--- a/drivers/pci/hotplug/cpci_hotplug_pci.c
+++ b/drivers/pci/hotplug/cpci_hotplug_pci.c
@@ -285,42 +285,19 @@ int __ref cpci_configure_slot(struct slot *slot)
 	for (fn = 0; fn < 8; fn++) {
 		struct pci_dev *dev;
 
-		dev = pci_get_slot(parent, PCI_DEVFN(PCI_SLOT(slot->devfn), fn));
+		dev = pci_get_slot(parent,
+				   PCI_DEVFN(PCI_SLOT(slot->devfn), fn));
 		if (!dev)
 			continue;
 		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
-		    (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
-			/* Find an unused bus number for the new bridge */
-			struct pci_bus *child;
-			unsigned char busnr, start = parent->secondary;
-			unsigned char end = parent->subordinate;
-
-			for (busnr = start; busnr <= end; busnr++) {
-				if (!pci_find_bus(pci_domain_nr(parent),
-						  busnr))
-					break;
-			}
-			if (busnr >= end) {
-				err("No free bus for hot-added bridge\n");
-				pci_dev_put(dev);
-				continue;
-			}
-			child = pci_add_new_bus(parent, dev, busnr);
-			if (!child) {
-				err("Cannot add new bus for %s\n",
-				    pci_name(dev));
-				pci_dev_put(dev);
-				continue;
-			}
-			child->subordinate = pci_do_scan_bus(child);
-			pci_bus_size_bridges(child);
-		}
+		    (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
+			pci_hp_add_bridge(dev);
 		pci_dev_put(dev);
 	}
 
-	pci_bus_assign_resources(parent);
+	pci_assign_unassigned_bridge_resources(parent->self);
+
 	pci_bus_add_devices(parent);
-	pci_enable_bridges(parent);
 
 	dbg("%s - exit", __func__);
 	return 0;
-- 
1.7.7

[PATCH 3/7] PCI, shpchp: Simplify configure_device

[Yinghai Lu]

For child p2p bridge hotplug support should use pci_scan_bridge instead.

Make it more simillar to pciehp, just use pci_hp_add_bridge()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/hotplug/shpchp_pci.c |   45 ++++++++++++-------------------------
 1 files changed, 15 insertions(+), 30 deletions(-)

diff --git a/drivers/pci/hotplug/shpchp_pci.c b/drivers/pci/hotplug/shpchp_pci.c
index df7e4bf..c627ed9 100644
--- a/drivers/pci/hotplug/shpchp_pci.c
+++ b/drivers/pci/hotplug/shpchp_pci.c
@@ -37,9 +37,10 @@
 int __ref shpchp_configure_device(struct slot *p_slot)
 {
 	struct pci_dev *dev;
-	struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
-	int num, fn;
 	struct controller *ctrl = p_slot->ctrl;
+	struct pci_dev *bridge = ctrl->pci_dev;
+	struct pci_bus *parent = bridge->subordinate;
+	int num, fn;
 
 	dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
 	if (dev) {
@@ -61,39 +62,23 @@ int __ref shpchp_configure_device(struct slot *p_slot)
 		if (!dev)
 			continue;
 		if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
-				(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
-			/* Find an unused bus number for the new bridge */
-			struct pci_bus *child;
-			unsigned char busnr, start = parent->secondary;
-			unsigned char end = parent->subordinate;
-			for (busnr = start; busnr <= end; busnr++) {
-				if (!pci_find_bus(pci_domain_nr(parent),
-							busnr))
-					break;
-			}
-			if (busnr > end) {
-				ctrl_err(ctrl,
-					 "No free bus for hot-added bridge\n");
-				pci_dev_put(dev);
-				continue;
-			}
-			child = pci_add_new_bus(parent, dev, busnr);
-			if (!child) {
-				ctrl_err(ctrl, "Cannot add new bus for %s\n",
-					 pci_name(dev));
-				pci_dev_put(dev);
-				continue;
-			}
-			child->subordinate = pci_do_scan_bus(child);
-			pci_bus_size_bridges(child);
-		}
+		    (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
+			pci_hp_add_bridge(dev);
+		pci_dev_put(dev);
+	}
+
+	pci_assign_unassigned_bridge_resources(bridge);
+
+	for (fn = 0; fn < 8; fn++) {
+		dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
+		if (!dev)
+			continue;
 		pci_configure_slot(dev);
 		pci_dev_put(dev);
 	}
 
-	pci_bus_assign_resources(parent);
 	pci_bus_add_devices(parent);
-	pci_enable_bridges(parent);
+
 	return 0;
 }
 
-- 
1.7.7

[PATCH 4/7] PCI, cpqhp: Using pci_hp_add_bridge

[Yinghai Lu]

instead of open code with pci_add_new_bus()/do_scan_bus...

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/hotplug/cpqphp_pci.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/hotplug/cpqphp_pci.c b/drivers/pci/hotplug/cpqphp_pci.c
index 1c84940..09801c6 100644
--- a/drivers/pci/hotplug/cpqphp_pci.c
+++ b/drivers/pci/hotplug/cpqphp_pci.c
@@ -83,7 +83,6 @@ static void __iomem *detect_HRT_floating_pointer(void __iomem *begin, void __iom
 
 int cpqhp_configure_device (struct controller* ctrl, struct pci_func* func)
 {
-	unsigned char bus;
 	struct pci_bus *child;
 	int num;
 
@@ -106,9 +105,10 @@ int cpqhp_configure_device (struct controller* ctrl, struct pci_func* func)
 	}
 
 	if (func->pci_dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
-		pci_read_config_byte(func->pci_dev, PCI_SECONDARY_BUS, &bus);
-		child = (struct pci_bus*) pci_add_new_bus(func->pci_dev->bus, (func->pci_dev), bus);
-		pci_do_scan_bus(child);
+		pci_hp_add_bridge(func->pci_dev);
+		child = func->pci_dev->subordinate;
+		if (child)
+			pci_bus_add_devices(child);
 	}
 
 	pci_dev_put(func->pci_dev);
-- 
1.7.7

[PATCH 5/7] PCI, ibmhp: Using pci_hp_add_bridge

[Yinghai Lu]

instead of open code with pci_add_new_bus()/do_scan_bus...

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/hotplug/ibmphp_core.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp_core.c
index 4fda7e6..7dccad5 100644
--- a/drivers/pci/hotplug/ibmphp_core.c
+++ b/drivers/pci/hotplug/ibmphp_core.c
@@ -775,7 +775,6 @@ static u8 bus_structure_fixup(u8 busno)
 
 static int ibm_configure_device(struct pci_func *func)
 {
-	unsigned char bus;
 	struct pci_bus *child;
 	int num;
 	int flag = 0;	/* this is to make sure we don't double scan the bus,
@@ -805,9 +804,10 @@ static int ibm_configure_device(struct pci_func *func)
 		}
 	}
 	if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
-		pci_read_config_byte(func->dev, PCI_SECONDARY_BUS, &bus);
-		child = pci_add_new_bus(func->dev->bus, func->dev, bus);
-		pci_do_scan_bus(child);
+		pci_hp_add_bridge(func->dev);
+		child = func->dev->subordinate;
+		if (child)
+			pci_bus_add_devices(child);
 	}
 
 	return 0;
-- 
1.7.7

[PATCH 6/7] PCI, sgihp: Using pci_hp_add_bridge

[Yinghai Lu]

instead of open code with pci_add_new_bus()/do_scan_bus...

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/hotplug/sgi_hotplug.c |   12 +++++-------
 1 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index de57311..f64ca92 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -397,13 +397,11 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
 			else
 				sn_io_slot_fixup(dev);
 			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
-				unsigned char sec_bus;
-				pci_read_config_byte(dev, PCI_SECONDARY_BUS,
-						     &sec_bus);
-				new_bus = pci_add_new_bus(dev->bus, dev,
-							  sec_bus);
-				pci_scan_child_bus(new_bus);
-				new_ppb = 1;
+				pci_hp_add_bridge(dev);
+				if (dev->subordinate) {
+					new_bus = dev->subordinate;
+					new_ppb = 1;
+				}
 			}
 			pci_dev_put(dev);
 		}
-- 
1.7.7

[PATCH 7/7] PCI, hotplug: remove pci_do_scan_bus()

[Yinghai Lu]

Now alll open code calling with that are gone.

So could get rid of pci_do_scan_bus()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/hotplug-pci.c |   15 ---------------
 drivers/pci/pci.h         |    1 -
 2 files changed, 0 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/hotplug-pci.c b/drivers/pci/hotplug-pci.c
index 1da0cae..01eae34 100644
--- a/drivers/pci/hotplug-pci.c
+++ b/drivers/pci/hotplug-pci.c
@@ -27,18 +27,3 @@ int __ref pci_hp_add_bridge(struct pci_dev *dev)
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pci_hp_add_bridge);
-
-unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
-{
-	unsigned int max;
-
-	max = pci_scan_child_bus(bus);
-
-	/*
-	 * Make the discovered devices available.
-	 */
-	pci_bus_add_devices(bus);
-
-	return max;
-}
-EXPORT_SYMBOL(pci_do_scan_bus);
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index f3e14ce..1c56ea8 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -125,7 +125,6 @@ static inline int pci_proc_detach_bus(struct pci_bus *bus) { return 0; }
 
 /* Functions for PCI Hotplug drivers to use */
 int pci_hp_add_bridge(struct pci_dev *dev);
-extern unsigned int pci_do_scan_bus(struct pci_bus *bus);
 
 #ifdef HAVE_PCI_LEGACY
 extern void pci_create_legacy_files(struct pci_bus *bus);
-- 
1.7.7