linux-kernel - [PATCH] PCI probe: fix "can't handle 64-bit address space for bridge" on x86-32 PAE

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Message-Id: <201108100002.p7A02OcR001266@pogo.cesa.opbu.xerox.com>
Date:	Tue, 09 Aug 2011 17:02:24 -0700
From:	Andrew Klossner <andrew@...a.opbu.xerox.com>
To:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] PCI probe: fix "can't handle 64-bit address space for bridge" on x86-32 PAE

If sizeof(long) is 4 bytes but sizeof(phys_addr_t) is 8 bytes, don't
fail to configure a bridge for PCI prefetchable memory space that
extends beyond 4GB.  The problem was encountered on an embedded system
using a Freescale MPC8536 PowerPC processor.  The problem is possible
on x86-32 systems with PAE, although it has not been observed in the
wild.

This patch preserves the current behavior for any oddball systems on
which sizeof(long) is 8 bytes and sizeof(phys_addr_t) is 4 bytes.

Signed-off-by: Andrew Klossner <andrew@...a.opbu.xerox.com>

---
 drivers/pci/probe.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 795c902..1385bd3 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -316,7 +316,11 @@ static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
 {
 	struct pci_dev *dev = child->self;
 	u16 mem_base_lo, mem_limit_lo;
+#if defined CONFIG_PHYS_ADDR_T_64BIT & BITS_PER_LONG != 64
+	phys_addr_t base, limit;
+#else
 	unsigned long base, limit;
+#endif
 	struct resource *res;
 
 	res = child->resource[2];
@@ -339,6 +343,9 @@ static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
 #if BITS_PER_LONG == 64
 			base |= ((long) mem_base_hi) << 32;
 			limit |= ((long) mem_limit_hi) << 32;
+#elif defined CONFIG_PHYS_ADDR_T_64BIT
+			base |= ((phys_addr_t) mem_base_hi) << 32;
+			limit |= ((phys_addr_t) mem_limit_hi) << 32;
 #else
 			if (mem_base_hi || mem_limit_hi) {
 				dev_err(&dev->dev, "can't handle 64-bit "
--
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