From deb2d2ecd43dfc51efe71eed7128fda514da96c6 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Tue, 11 Aug 2009 15:52:06 +1000 Subject: PCI/GPU: implement VGA arbitration on Linux Background: Graphic devices are accessed through ranges in I/O or memory space. While most modern devices allow relocation of such ranges, some "Legacy" VGA devices implemented on PCI will typically have the same "hard-decoded" addresses as they did on ISA. For more details see "PCI Bus Binding to IEEE Std 1275-1994 Standard for Boot (Initialization Configuration) Firmware Revision 2.1" Section 7, Legacy Devices. The Resource Access Control (RAC) module inside the X server currently does the task of arbitration when more than one legacy device co-exists on the same machine. But the problem happens when these devices are trying to be accessed by different userspace clients (e.g. two server in parallel). Their address assignments conflict. Therefore an arbitration scheme _outside_ of the X server is needed to control the sharing of these resources. This document introduces the operation of the VGA arbiter implemented for Linux kernel. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Tiago Vignatti Signed-off-by: Dave Airlie Signed-off-by: Jesse Barnes --- drivers/video/Kconfig | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/video') diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 3b54b394017..a0d9ee1df34 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -7,6 +7,8 @@ menu "Graphics support" source "drivers/char/agp/Kconfig" +source "drivers/gpu/vga/Kconfig" + source "drivers/gpu/drm/Kconfig" config VGASTATE -- cgit v1.2.3-18-g5258