Commit graph

9 commits

Author SHA1 Message Date
Chris Wilson
04cbe1de6f vgaarb: Wrap vga_(get|put) in CONFIG_VGA_ARB
Fix link failure without the vga arbitrator.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-08-27 09:10:44 +10:00
Dave Airlie
71beefe8c0 vgaarb: drop vga.h include
We don't actually need this include on any platform.

built on powerpc + x86, reported on m68k.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-08-12 11:47:26 +10:00
Doug Goldstein
a6a1a095ec include/linux/vgaarb.h: add missing part of include guard
vgaarb.h was missing the #define of the #ifndef at the top for the guard
to prevent multiple #include's from causing re-define errors

Signed-off-by: Doug Goldstein <cardoe@gentoo.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-07-21 09:51:15 +10:00
Tiago Vignatti
c0db9cbc73 vgaarb: use MIT license
Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>
Cc: Henry Zhao <Henry.Zhao@Sun.COM>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-06-03 13:13:34 +10:00
Linus Torvalds
b7f21bb2e2 Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
* 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (21 commits)
  x86/PCI: make 32 bit NUMA node array int, not unsigned char
  x86/PCI: default pcibus cpumask to all cpus if it lacks affinity
  MAINTAINTERS: remove hotplug driver entries
  PCI: pciehp: remove slot capabilities definitions
  PCI: pciehp: remove error message definitions
  PCI: pciehp: remove number field
  PCI: pciehp: remove hpc_ops
  PCI: pciehp: remove pci_dev field
  PCI: pciehp: remove crit_sect mutex
  PCI: pciehp: remove slot_bus field
  PCI: pciehp: remove first_slot field
  PCI: pciehp: remove slot_device_offset field
  PCI: pciehp: remove hp_slot field
  PCI: pciehp: remove device field
  PCI: pciehp: remove bus field
  PCI: pciehp: remove slot_num_inc field
  PCI: pciehp: remove num_slots field
  PCI: pciehp: remove slot_list field
  PCI: fix VGA arbiter header file
  PCI: Disable AER with pci=nomsi
  ...

Fixed up trivial conflicts in MAINTAINERS
2009-09-24 09:57:08 -07:00
Ingo Molnar
7c329288d7 vgaarb: make client interface config invariant.
Fixes build when VGA_ARB is off.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2009-09-23 09:52:18 +10:00
Jesse Barnes
e2d4304b7d PCI: fix VGA arbiter header file
Remove reference to vgaarb.c and replace it with a comment about the
arbiter itself.

Reported-by: Tiago Vignatti <tiago.vignatti@nokia.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-09-17 10:05:28 -07:00
Dave Airlie
6ac3bd5270 PCI/vgaarb: cleanup some warnings + cleanup some comments.
Fix some warnings reported in linux-next + also cleanup some
comment errors noticed by Pekka Paalanen.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-09-09 13:29:41 -07:00
Benjamin Herrenschmidt
deb2d2ecd4 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 <benh@kernel.crashing.org>
Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-09-09 13:29:36 -07:00