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Update the VGA Arbiter to allow the user to select the number
of GPU's supported in a system.
v2: simplify setting of MAX_USER_CARDS, revert back to original default of 16
Signed-off-by: Mike Travis <[email protected]>
LKML-Reference: <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Robin Holt <[email protected]>
Cc: Jack Steiner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jesse Barnes <[email protected]>
Cc: David Airlie <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
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Update the VGA Arbiter to accept PCI Domains other than 0.
Signed-off-by: Mike Travis <[email protected]>
LKML-Reference: <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Robin Holt <[email protected]>
Cc: Jack Steiner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jesse Barnes <[email protected]>
Cc: David Airlie <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
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Fix some warnings reported in linux-next + also cleanup some
comment errors noticed by Pekka Paalanen.
Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>
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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 <[email protected]>
Signed-off-by: Tiago Vignatti <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>
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