linux-kernel - [PATCH] x86/sfi: fix ioapic gsi range

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Message-Id: <1275952044-27996-1-git-send-email-jacob.jun.pan@linux.intel.com>
Date:	Mon,  7 Jun 2010 16:07:24 -0700
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	Alan Cox <alan@...ux.intel.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Feng Tang <feng.tang@...el.com>,
	Len Brown <len.brown@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH] x86/sfi: fix ioapic gsi range

SFI based platforms should have zero based gsi_base for IOAPICs found in SFI
tables. The current code sets gsi_base starting from 1 when registering ioapic.
The result is that Moorestown platform would have wrong mp_gsi_routing for each
ioapic.

Background:
In Moorestown/Medfield platforms, there is no legacy IRQs, all gsis and irqs
are one to one mapped, including those < 16. Specifically, IRQ0 and IRQ1 are
used for per-cpu timers. So without this patch, IOAPIC pin to IRQ mapping is
off by one.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 arch/x86/kernel/sfi.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/sfi.c b/arch/x86/kernel/sfi.c
index 7ded578..8d31950 100644
--- a/arch/x86/kernel/sfi.c
+++ b/arch/x86/kernel/sfi.c
@@ -87,14 +87,17 @@ static int __init sfi_parse_ioapic(struct sfi_table_header *table)
 	struct sfi_table_simple *sb;
 	struct sfi_apic_table_entry *pentry;
 	int i, num;
+	u32 gsi_base;
 
 	sb = (struct sfi_table_simple *)table;
 	num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry);
 	pentry = (struct sfi_apic_table_entry *)sb->pentry;
 
+	gsi_base = gsi_end;
 	for (i = 0; i < num; i++) {
-		mp_register_ioapic(i, pentry->phys_addr, gsi_end + 1);
+		mp_register_ioapic(i, pentry->phys_addr, gsi_base);
 		pentry++;
+		gsi_base = gsi_end + 1;
 	}
 
 	WARN(pic_mode, KERN_WARNING
-- 
1.6.3.3

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