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From: Mike Travis on 18 Jan 2010 13:40
Update the VGA Arbiter to allow the user to select the number
of GPU's supported in a system.

Signed-off-by: Mike Travis <travis(a)sgi.com>

Cc: Dave Airlie <airlied(a)redhat.com>
Cc: Alex Chiang <achiang(a)hp.com>
Cc: Thomas Gleixner <tglx(a)linutronix.de>
Cc: Cyrill Gorcunov <gorcunov(a)openvz.org>
Cc: Benjamin Herrenschmidt <benh(a)kernel.crashing.org>
Cc: Robin Holt <holt(a)sgi.com>
Cc: Rafael J. Wysocki <rjw(a)sisk.pl>
Cc: Adam Jackson <ajax(a)nwnk.net>
Cc: Kenji Kaneshige <kaneshige.kenji(a)jp.fujitsu.com>
Cc: Andrew Morton <akpm(a)linux-foundation.org>
Cc: Gaetan Nadon <memsize(a)videotron.ca>
Cc: H. Peter Anvin <hpa(a)zytor.com>
Cc: Aaron Plattner <aplattner(a)nvidia.com>
Cc: Jack Steiner <steiner(a)sgi.com>
Cc: Tiago Vignatti <tiago.vignatti(a)nokia.com>
Cc: Cliff Wickman <cpw(a)sgi.com>
Cc: Matthew Wilcox <willy(a)linux.intel.com>
Cc: Christian Zander <chzander(a)nvidia.com>
Cc: Yu Zhao <yu.zhao(a)intel.com>

Cc: linux-kernel(a)vger.kernel.org
Cc: linux-pci(a)vger.kernel.org
Cc: x86(a)kernel.org
---
drivers/gpu/vga/Kconfig | 8 ++++++++
drivers/gpu/vga/vgaarb.c | 4 ++++
2 files changed, 12 insertions(+)

--- linux.orig/drivers/gpu/vga/Kconfig
+++ linux/drivers/gpu/vga/Kconfig
@@ -8,3 +8,11 @@
are accessed at same time they need some kind of coordination. Please
see Documentation/vgaarbiter.txt for more details. Select this to
enable VGA arbiter.
+
+config VGA_ARB_MAX_GPUS
+ int "Maximum number of GPUs"
+ default 64
+ depends on VGA_ARB
+ help
+ Reserves space in the kernel to maintain resource locking for
+ multiple GPUS. The overhead for each GPU is very small.
--- linux.orig/drivers/gpu/vga/vgaarb.c
+++ linux/drivers/gpu/vga/vgaarb.c
@@ -688,7 +688,11 @@
* the arbiter.
*/

+#ifdef CONFIG_VGA_ARB_MAX_GPUS
+#define MAX_USER_CARDS CONFIG_VGA_ARB_MAX_GPUS
+#else
#define MAX_USER_CARDS 16
+#endif
#define PCI_INVALID_CARD ((struct pci_dev *)-1UL)

/*

--
--
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