PCI/VGA: Move vgaarb to drivers/pci

The VGA arbiter is really PCI-specific and doesn't depend on any GPU
things. Move it to the PCI subsystem.

Note that misc_init() must be called before vga_arb_d

PCI/VGA: Move vgaarb to drivers/pci

The VGA arbiter is really PCI-specific and doesn't depend on any GPU
things. Move it to the PCI subsystem.

Note that misc_init() must be called before vga_arb_device_init(). These
are both subsys_initcalls, so this ordering depends on the link order,
which is determined by drivers/Makefile:

obj-y += pci/
obj-y += char/ <-- misc_init()
obj-y += gpu/ <-- vga_arb_device_init() (before this commit)

The drivers/pci/ subsys_initcalls are called *before* misc_init(), so
convert vga_arb_device_init() to subsys_initcall_sync(), which is called
after *all* subsys_initcalls.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Helgaas <[email protected]>

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vga: Fix Kconfig indentation

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
$ sed -e 's/^ /\t/' -i */Kconfig

Signed-off-by: Krzysztof Koz

vga: Fix Kconfig indentation

Adjust indentation from spaces to tab (+optional two spaces) as in
coding style with command like:
$ sed -e 's/^ /\t/' -i */Kconfig

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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vga_switcheroo: Depend upon fbcon being built-in, if enabled

Fixes linking fail when fbcon/fbdev is modular and vgaswitcheroo is
enabled:

x86_64-linux-gnu-ld: drivers/gpu/vga/vga_switcheroo.o: in f

vga_switcheroo: Depend upon fbcon being built-in, if enabled

Fixes linking fail when fbcon/fbdev is modular and vgaswitcheroo is
enabled:

x86_64-linux-gnu-ld: drivers/gpu/vga/vga_switcheroo.o: in function `vga_switchto_stage2':
vga_switcheroo.c:(.text+0x997): undefined reference to `fbcon_remap_all'

Unfortunately this means that in a default allmodconfig we will disable vgaswitcheroo.

v2: I first tried to fix this with an EXPORT_SYMBOL, but vga_switcheroo is
never a module, so this doesn't work.

Reported-by: Stephen Rothwell <[email protected]>
Reported-by: kbuild test robot <[email protected]>
Fixes: 1cd51b5d200d ("vgaswitcheroo: call fbcon_remap_all directly")
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Lukas Wunner <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Bartlomiej Zolnierkiewicz <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Yisheng Xie <[email protected]>
Cc: [email protected]
Cc: Daniel Thompson <[email protected]>
Cc: Lee Jones <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Maarten Lankhorst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project

treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0-only

Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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vga-switcheroo: make PCI dependency explicit

This driver depends on the PCI infrastructure, but the dependency has
not been explicitly called out.

Fixes: 5d32a66541c46 ("PCI/ACPI: Allow ACPI to be

vga-switcheroo: make PCI dependency explicit

This driver depends on the PCI infrastructure, but the dependency has
not been explicitly called out.

Fixes: 5d32a66541c46 ("PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set")
Signed-off-by: Sinan Kaya <[email protected]>
Reviewed-by: Lukas Wunner <[email protected]>
Acked-by: Daniel Vetter <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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docs: Fix some broken references

As we move stuff around, some doc references are broken. Fix some of
them via this script:
./scripts/documentation-file-ref-check --fix

Manually checked if the pro

docs: Fix some broken references

As we move stuff around, some doc references are broken. Fix some of
them via this script:
./scripts/documentation-file-ref-check --fix

Manually checked if the produced result is valid, removing a few
false-positives.

Acked-by: Takashi Iwai <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Acked-by: Stephen Boyd <[email protected]>
Acked-by: Charles Keepax <[email protected]>
Acked-by: Mathieu Poirier <[email protected]>
Reviewed-by: Coly Li <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Acked-by: Jonathan Corbet <[email protected]>

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vga: compile fix, disable vga for s390

Signed-off-by: Jan Glauber <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>

vga-switcheroo: select VGA arbitration.

Since Matthew's changes we have to select arbitration.

Reported-by: devh on #radeon
Signed-off-by: Dave Airlie <[email protected]>

kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT

The meaning of CONFIG_EMBEDDED has long since been obsoleted; the option
is used to configure any non-standard kernel with a much larger scope than
o

kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT

The meaning of CONFIG_EMBEDDED has long since been obsoleted; the option
is used to configure any non-standard kernel with a much larger scope than
only small devices.

This patch renames the option to CONFIG_EXPERT in init/Kconfig and fixes
references to the option throughout the kernel. A new CONFIG_EMBEDDED
option is added that automatically selects CONFIG_EXPERT when enabled and
can be used in the future to isolate options that should only be
considered for embedded systems (RISC architectures, SLOB, etc).

Calling the option "EXPERT" more accurately represents its intention: only
expert users who understand the impact of the configuration changes they
are making should enable it.

Reviewed-by: Ingo Molnar <[email protected]>
Acked-by: David Woodhouse <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
Cc: Greg KH <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Robin Holt <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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vga: fix kconfig text typos

Fix typos in vga/Kconfig file
and use GPU (upper case) consistently.

Signed-off-by: Randy Dunlap <[email protected]>
Cc: [email protected]
Signed-off

vga: fix kconfig text typos

Fix typos in vga/Kconfig file
and use GPU (upper case) consistently.

Signed-off-by: Randy Dunlap <[email protected]>
Cc: [email protected]
Signed-off-by: Dave Airlie <[email protected]>

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vga_switcheroo: disable default y by new rules.

Another undocumented rule of kernel folklore, no default y
config options anymore, apparantly hinting to distros they might
want something isn't prefe

vga_switcheroo: disable default y by new rules.

Another undocumented rule of kernel folklore, no default y
config options anymore, apparantly hinting to distros they might
want something isn't preferred anymore.

Signed-off-by: Dave Airlie <[email protected]>

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vga_switcheroo: initial implementation (v15)

Many new laptops now come with 2 gpus, one to be used for low power
modes and one for gaming/on-ac applications. These GPUs are typically
wired to the la

vga_switcheroo: initial implementation (v15)

Many new laptops now come with 2 gpus, one to be used for low power
modes and one for gaming/on-ac applications. These GPUs are typically
wired to the laptop panel and VGA ports via a multiplexer unit which
is controlled via ACPI methods.

4 combinations of systems typically exist - with 2 ACPI methods.
Intel/ATI - Lenovo W500/T500 - use ATPX ACPI method
ATI/ATI - some ASUS - use ATPX ACPI Method
Intel/Nvidia - - use _DSM ACPI method
Nvidia/Nvidia - - use _DSM ACPI method.

TODO:
This patch adds support for the ATPX method and initial bits
for the _DSM methods that need to written by someone with
access to the hardware.
Add a proper non-debugfs interface - need to get some proper
testing first.

v2: add power up/down support for both devices
on W500 puts i915/radeon into D3 and cuts power to radeon.

v3: redo probing methods, no DMI list, drm devices call to
register with switcheroo, it tries to find an ATPX method on
any device and once there is two devices + ATPX it inits the
switcher.

v4: ATPX msg handling using buffers - should work on more machines

v5: rearchitect after more mjg59 discussion - move ATPX handling to
radeon driver.

v6: add file headers + initial nouveau bits (to be filled out).

v7: merge delayed switcher code.

v8: avoid suspend/resume of gpu that is off

v9: rearchitect - mjg59 is always right. - move all ATPX code to
radeon, should allow simpler DSM also proper ATRM handling

v10: add ATRM support for radeon BIOS, add mutex to lock vgasr_priv

v11: fix bug in resuming Intel for 2nd time.

v12: start fixing up nvidia code blindly.

v13: blindly guess at finishing nvidia code

v14: remove radeon audio hacks - fix up intel resume more like upstream

v15: clean up printks + remove unnecessary igd/dis pointers

mount debugfs

/sys/kernel/debug/vgaswitcheroo/switch - should exist if ATPX detected
+ 2 cards.

DIS - immediate change to discrete
IGD - immediate change to IGD
DDIS - delayed change to discrete
DIGD - delayed change to IGD
ON - turn on not in use
OFF - turn off not in use

Tested on W500 (Intel/ATI) and T500 (Intel/ATI)

Signed-off-by: Dave Airlie <[email protected]>

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vgaarb: Add user selectability of the number of GPUS in a system

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

vgaarb: Add user selectability of the number of GPUS in a system

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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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" V

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 <[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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