linux-kernel - [PATCH] calgary: Increase the maximum PHB bus number

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Date:	Tue, 8 Dec 2009 16:59:01 -0800
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Jon D. Mason" <jdmason@...zu.us>, discuss@...-64.org,
	Corinna Schultz <coschult@...ibm.com>,
	Muli Ben-Yehuda <muli@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] calgary: Increase the maximum PHB bus number

Newer systems (x3950M2) can have 48 PHBs per chassis and 8 chassis, so bump the
limits up and provide an explanation of the requirements for each class.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---

 arch/x86/kernel/pci-calgary_64.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)


diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index e6ec8a2..a693037 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -102,10 +102,15 @@ int use_calgary __read_mostly = 0;
 #define PMR_SOFTSTOPFAULT	0x40000000
 #define PMR_HARDSTOP		0x20000000
 
-#define MAX_NUM_OF_PHBS		8 /* how many PHBs in total? */
-#define MAX_NUM_CHASSIS		8 /* max number of chassis */
-/* MAX_PHB_BUS_NUM is the maximal possible dev->bus->number */
-#define MAX_PHB_BUS_NUM		(MAX_NUM_OF_PHBS * MAX_NUM_CHASSIS * 2)
+/*
+   The maximum PHB bus number.
+   x3950M2 (rare): 8 chassis, 48 PHBs per chassis = 384
+   x3950M2: 4 chassis, 48 PHBs per chassis        = 192
+   x3950 (PCIE): 8 chassis, 32 PHBs per chassis   = 256
+   x3950 (PCIX): 8 chassis, 16 PHBs per chassis   = 128
+*/
+#define MAX_PHB_BUS_NUM		384
+
 #define PHBS_PER_CALGARY	4
 
 /* register offsets in Calgary's internal register space */
--
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