linux-kernel - [PATCH 9/9] pci: pciehp second try to get big range for pcie devices

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Message-ID: <4B0D8CB8.1070404@kernel.org>
Date:	Wed, 25 Nov 2009 11:59:52 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alex Chiang <achiang@...com>,
	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: [PATCH 9/9] pci: pciehp second try to get big range for pcie devices


handle the case the slot bridge that doesn't get pre-allocated big enough res
from FW.
for example pcie devices need 256M, but the bridge only get preallocated 2M...

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 drivers/pci/setup-bus.c |   41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -970,13 +970,52 @@ void pci_assign_unassigned_bridge_resour
 {
 	struct pci_bus *bus;
 	struct pci_bus *parent = bridge->subordinate;
+	bool second_tried = false;
+	struct resource_list head, *list, *tmp;
 	int retval;
+	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+				  IORESOURCE_PREFETCH;
+
+again:
+	head.next = NULL;
 
 	pci_bus_size_bridges(parent);
 	pci_clear_master(bridge);
-	__pci_bridge_assign_resources(bridge, NULL);
+	__pci_bridge_assign_resources(bridge, &head);
 	retval = pci_reenable_device(bridge);
 	pci_set_master(bridge);
 	pci_enable_bridges(parent);
+
+	/* any device complain? */
+	if (!head.next)
+		return;
+
+	if (second_tried) {
+		/* still fail, don't want to try more */
+		free_failed_list(&head);
+		return;
+	}
+
+	second_tried = true;
+	printk(KERN_DEBUG "PCI: second try to assign unassigned res\n");
+
+	/*
+	 * Try to release leaf bridge's resources that doesn't fit resource of
+	 * child device under that bridge
+	 */
+	for (list = head.next; list;) {
+		unsigned long flags = list->res->flags;
+
+		bus = list->dev->bus;
+		if (list->dev->subordinate)
+			list->res->flags = 0;
+		pci_bus_release_unused_bridge_res(bus, flags & type_mask, 0);
+
+		tmp = list;
+		list = list->next;
+		kfree(tmp);
+	}
+
+	goto again;
 }
 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);

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