linux-kernel - [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first

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Date:	Tue, 22 May 2012 23:34:28 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first

and will fall back to below 4g if it can not find any above 4g.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/pci/bus.c |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 4ce5ef2..2429f1f 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -122,13 +122,17 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
 	int i, ret = -ENOMEM;
 	struct resource *r;
 	resource_size_t max = -1;
+	resource_size_t bottom = PCIBIOS_MAX_MEM_32 + 1ULL;
 
 	type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
 
 	/* don't allocate too high if the pref mem doesn't support 64bit*/
-	if (!(res->flags & IORESOURCE_MEM_64))
+	if (!(res->flags & IORESOURCE_MEM_64)) {
 		max = PCIBIOS_MAX_MEM_32;
+		bottom = 0;
+	}
 
+again:
 	pci_bus_for_each_resource(bus, r, i) {
 		if (!r)
 			continue;
@@ -145,12 +149,18 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
 
 		/* Ok, try it out.. */
 		ret = allocate_resource(r, res, size,
-					r->start ? : min,
+					max(bottom, r->start ? : min),
 					max, align,
 					alignf, alignf_data);
 		if (ret == 0)
-			break;
+			return 0;
 	}
+
+	if (bottom != 0) {
+		bottom = 0;
+		goto again;
+	}
+
 	return ret;
 }
 
-- 
1.7.7

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