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Subject[PATCH 2/2] pciehp: add support for bridge resource reallocation -v2

From: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>

With this patch, pciehp driver try to clear PCI bridge resources to
parent bridge (root port or switch downstream port) of the slot

so we can shrink pci bridge resource for those port

This feature is enabled when 'pciehp_realloc' option is specified.

-v2: make it could be appiled after Yinghai patchset that touch pci bridge resource
also remove poweron check, because pci_bridge_release_res will check child at first
need to apply this one after 9/9 patchset

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
drivers/pci/hotplug/pciehp.h | 1 +
drivers/pci/hotplug/pciehp_core.c | 7 +++++++
drivers/pci/hotplug/pciehp_pci.c | 4 ++++
3 files changed, 12 insertions(+)
Index: linux-2.6/drivers/pci/hotplug/pciehp.h
===================================================================
--- linux-2.6.orig/drivers/pci/hotplug/pciehp.h
+++ linux-2.6/drivers/pci/hotplug/pciehp.h
@@ -43,6 +43,7 @@ extern int pciehp_poll_mode;
extern int pciehp_poll_time;
extern int pciehp_debug;
extern int pciehp_force;
+extern int pciehp_realloc;
extern struct workqueue_struct *pciehp_wq;

#define dbg(format, arg...) \
Index: linux-2.6/drivers/pci/hotplug/pciehp_core.c
===================================================================
--- linux-2.6.orig/drivers/pci/hotplug/pciehp_core.c
+++ linux-2.6/drivers/pci/hotplug/pciehp_core.c
@@ -41,6 +41,7 @@ int pciehp_debug;
int pciehp_poll_mode;
int pciehp_poll_time;
int pciehp_force;
+int pciehp_realloc;
struct workqueue_struct *pciehp_wq;

#define DRIVER_VERSION "0.4"
@@ -55,10 +56,12 @@ module_param(pciehp_debug, bool, 0644);
module_param(pciehp_poll_mode, bool, 0644);
module_param(pciehp_poll_time, int, 0644);
module_param(pciehp_force, bool, 0644);
+module_param(pciehp_realloc, bool, 0644);
MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
+MODULE_PARM_DESC(pciehp_realloc, "Realloc resources for slot's parent bridge");

#define PCIE_MODULE_NAME "pciehp"

@@ -297,6 +300,10 @@ static int pciehp_probe(struct pcie_devi
if (!occupied && poweron && POWER_CTRL(ctrl))
pciehp_power_off_slot(slot);

+ /* Release I/O window of the slots's parent bridge */
+ if (pciehp_realloc)
+ pci_bridge_release_res(dev->port->subordinate);
+
return 0;

err_out_free_ctrl_slot:
Index: linux-2.6/drivers/pci/hotplug/pciehp_pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/hotplug/pciehp_pci.c
+++ linux-2.6/drivers/pci/hotplug/pciehp_pci.c
@@ -166,5 +166,9 @@ int pciehp_unconfigure_device(struct slo
pci_dev_put(temp);
}

+ /* Release I/O window of the slots's parent bridge */
+ if (pciehp_realloc)
+ pci_bridge_release_res(parent);
+
return rc;
}

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