linux-kernel - [PATCH] x86/pci: fix mmconfig detection with 32bit near 4g

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Message-ID: <4A262289.3020307@kernel.org>
Date:	Wed, 03 Jun 2009 00:13:13 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	linux-kernel@...r.kernel.org, stable <stable@...nel.org>,
	linux-pci@...r.kernel.org, Pascal Terjan <pterjan@...driva.com>
Subject: [PATCH] x86/pci: fix mmconfig detection with 32bit near 4g


Pascal reported and bisected to commit:
|	x86/PCI: don't call e820_all_mapped with -1 in the mmconfig case

broke one system system.

ACPI: Using IOAPIC for interrupt routing
PCI: MCFG configuration 0: base f0000000 segment 0 buses 0 - 255
PCI: MCFG area at f0000000 reserved in ACPI motherboard resources
PCI: Using MMCONFIG for extended config space

it didn't have
PCI: updated MCFG configuration 0: base f0000000 segment 0 buses 0 - 63
anymore, and try to use 0xf000000 - 0xffffffff for mmconfig

for 32bit, mcfg_res->end could be 32bit only (if 64 res is not used)
use end - 1 to pass the value in mcfg->end to avoid overflow

don't need to worry about e820 path. they are 64 bit always

- for 2.6.30

Reported-by: Pascal Terjan <pterjan@...driva.com>
Bisected-by: Pascal Terjan <pterjan@...driva.com>
Tested-by: Pascal Terjan <pterjan@...driva.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: stable@...nel.org

---
 arch/x86/pci/mmconfig-shared.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux-2.6/arch/x86/pci/mmconfig-shared.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/mmconfig-shared.c
+++ linux-2.6/arch/x86/pci/mmconfig-shared.c
@@ -375,7 +375,7 @@ static acpi_status __init check_mcfg_res
 		if (!fixmem32)
 			return AE_OK;
 		if ((mcfg_res->start >= fixmem32->address) &&
-		    (mcfg_res->end <= (fixmem32->address +
+		    (mcfg_res->end < (fixmem32->address +
 				      fixmem32->address_length))) {
 			mcfg_res->flags = 1;
 			return AE_CTRL_TERMINATE;
@@ -392,7 +392,7 @@ static acpi_status __init check_mcfg_res
 		return AE_OK;
 
 	if ((mcfg_res->start >= address.minimum) &&
-	    (mcfg_res->end <= (address.minimum + address.address_length))) {
+	    (mcfg_res->end < (address.minimum + address.address_length))) {
 		mcfg_res->flags = 1;
 		return AE_CTRL_TERMINATE;
 	}
@@ -418,7 +418,7 @@ static int __init is_acpi_reserved(u64 s
 	struct resource mcfg_res;
 
 	mcfg_res.start = start;
-	mcfg_res.end = end;
+	mcfg_res.end = end - 1;
 	mcfg_res.flags = 0;
 
 	acpi_get_devices("PNP0C01", find_mboard_resource, &mcfg_res, NULL);
--
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