[PATCH 4/4] vgaarb: Add user selectability of the number of GPUS in a system

[Mike Travis]

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@xxxxxxx>

Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Alex Chiang <achiang@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Robin Holt <holt@xxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Adam Jackson <ajax@xxxxxxxx>
Cc: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Gaetan Nadon <memsize@xxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Aaron Plattner <aplattner@xxxxxxxxxx>
Cc: Jack Steiner <steiner@xxxxxxx>
Cc: Tiago Vignatti <tiago.vignatti@xxxxxxxxx>
Cc: Cliff Wickman <cpw@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Christian Zander <chzander@xxxxxxxxxx>
Cc: Yu Zhao <yu.zhao@xxxxxxxxx>

Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-pci@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
---
 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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