linux-kernel - [PATCH] x86: Allow MMCONFIG above 4GB on x86

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Message-Id: <20080709204127.1458.5727.77728@attica.americas.sgi.com>
Date:	Wed,  9 Jul 2008 15:41:27 -0500 (CDT)
From:	John Keller <jpk@....com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-acpi@...r.kernel.org, John Keller <jpk@....com>,
	takayoshi.kochi@...il.com
Subject: [PATCH] x86: Allow MMCONFIG above 4GB on x86_64

SGI UV will have MMCFG base addresses that are greater than 4GB (32 bits).

Signed-off-by: John Keller <jpk@....com>
---

A similar patch was submitted over a year ago, but apparently was not
merged in.

   http://marc.info/?l=linux-acpi&m=117283388212912&w=2


Index: linux-2.6/arch/x86/kernel/acpi/boot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/acpi/boot.c	2008-07-09 13:02:54.000000000 -0500
+++ linux-2.6/arch/x86/kernel/acpi/boot.c	2008-07-09 15:25:32.000000000 -0500
@@ -200,6 +200,7 @@ int __init acpi_parse_mcfg(struct acpi_t
 	}
 
 	memcpy(pci_mmcfg_config, &mcfg[1], config_size);
+#ifndef CONFIG_X86_64
 	for (i = 0; i < pci_mmcfg_config_num; ++i) {
 		if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
 			printk(KERN_ERR PREFIX
@@ -209,6 +210,7 @@ int __init acpi_parse_mcfg(struct acpi_t
 			return -ENODEV;
 		}
 	}
+#endif
 
 	return 0;
 }
--
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