linux-kernel - [PATCH 11/14] pci: pciehp second try to get big range for pcie devices

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Message-id: <1261522954-12591-12-git-send-email-yinghai@kernel.org>
Date:	Tue, 22 Dec 2009 15:02:31 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Alex Chiang <achiang@...com>,
	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 11/14] 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...

-v2: use resource_list_x

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/setup-bus.c |   49 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 48 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 056b98d..cc3474e 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1007,13 +1007,60 @@ void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
 {
 	struct pci_bus *bus;
 	struct pci_bus *parent = bridge->subordinate;
+	bool second_tried = false;
+	struct resource_list_x head, *list;
 	int retval;
+	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+				  IORESOURCE_PREFETCH;
+
+	head.next = NULL;
 
+again:
 	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 need 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->flags;
+
+		bus = list->dev->bus;
+		pci_bus_release_unused_bridge_res(bus, flags & type_mask, 0);
+		list = list->next;
+	}
+	/* retore size and flags */
+	for (list = head.next; list;) {
+		struct resource *res = list->res;
+
+		res->start = list->start;
+		res->end = list->end;
+		res->flags = list->flags;
+		if (list->dev->subordinate)
+			res->flags = 0;
+
+		list = list->next;
+	}
+	free_failed_list(&head);
+
+	goto again;
 }
 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
-- 
1.6.0.2

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