linux-kernel - Re: [PATCH RESEND] (revised) Calgary: increase max PHB number

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Date:	Thu, 24 Jun 2010 14:26:47 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Corinna Schultz <cschultz@...ux.vnet.ibm.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, coschult@...ibm.com
Subject: Re: [PATCH RESEND] (revised) Calgary: increase max PHB 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>
Acked-by: Muli Ben-Yehuda <muli@...ibm.com>

diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index fb99f7e..967c646 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -103,11 +103,14 @@ 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)
-#define PHBS_PER_CALGARY	4
+/*
+ * 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
 
 /* register offsets in Calgary's internal register space */
 static const unsigned long tar_offsets[] = {
--
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