linux.git/arch/powerpc/kernel/firmware.c, branch v5.11

powerpc: Reintroduce is_kvm_guest() as a fast-path check

2020-12-03T14:01:22+00:00

Introduce a static branch that would be set during boot if the OS
happens to be a KVM guest. Subsequent checks to see if we are on KVM
will rely on this static branch. This static branch would be used in
vcpu_is_preempted() in a subsequent patch.

Signed-off-by: Srikar Dronamraju 
Acked-by: Waiman Long 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20201202050456.164005-4-srikar@linux.vnet.ibm.com

powerpc: Rename is_kvm_guest() to check_kvm_guest()

2020-12-03T14:01:21+00:00

We want to reuse the is_kvm_guest() name in a subsequent patch but
with a new body. Hence rename is_kvm_guest() to check_kvm_guest(). No
additional changes.

Signed-off-by: Srikar Dronamraju 
Acked-by: Waiman Long 
Signed-off-by: kernel test robot  # int -> bool fix
[mpe: Fold in fix from lkp to use true/false not 0/1]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20201202050456.164005-3-srikar@linux.vnet.ibm.com

powerpc: Refactor is_kvm_guest() declaration to new header

2020-12-03T14:01:21+00:00

Only code/declaration movement, in anticipation of doing a KVM-aware
vcpu_is_preempted(). No additional changes.

Signed-off-by: Srikar Dronamraju 
Acked-by: Waiman Long 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20201202050456.164005-2-srikar@linux.vnet.ibm.com

powerpc/pseries: Add KVM guest doorbell restrictions

2020-07-29T11:02:10+00:00

KVM guests have certain restrictions and performance quirks when using
doorbells. This patch moves the EPAPR KVM guest test so it can be shared
with PSERIES, and uses that in doorbell setup code to apply the KVM
guest quirks and  improves IPI performance for two cases:

 - PowerVM guests may now use doorbells even if they are secure.

 - KVM guests no longer use doorbells if XIVE is available.

There is a valid complaint that "KVM guest" is not a very reasonable
thing to test for, it's preferable for the hypervisor to advertise
particular behaviours to the guest so they could change if the
hypervisor implementation or configuration changes. However in this case
we were already assuming a KVM guest worst case, so this patch is about
containing those quirks. If KVM later advertises fast doorbells, we
should test for that and override the quirks.

Signed-off-by: Nicholas Piggin 
Tested-by: Cédric Le Goater 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20200726035155.1424103-4-npiggin@gmail.com

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman

powerpc: fix implicit use of cache.h in kernel/firmware.c

2011-10-31T23:30:41+00:00

This file only needs export.h to get EXPORT_SYMBOL, but in doing
so, it uncovers an implicit use of linux/cache.h as follows:

 CC      arch/powerpc/kernel/firmware.o
arch/powerpc/kernel/firmware.c:20: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__read_mostly'
arch/powerpc/kernel/firmware.c:21: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__used'
make[2]: *** [arch/powerpc/kernel/firmware.o] Error 1

Signed-off-by: Paul Gortmaker

powerpc: Make powerpc_firmware_features __read_mostly

2010-02-09T02:56:07+00:00

We use firmware_has_feature quite a lot these days, so it's worth putting
powerpc_firmware_features into __read_mostly.

Signed-off-by: Anton Blanchard 
Signed-off-by: Benjamin Herrenschmidt

Remove obsolete #include

2006-06-30T17:25:36+00:00

Signed-off-by: Jörn Engel 
Signed-off-by: Adrian Bunk

[PATCH] powerpc: Rename and export ppc64_firmware_features

2006-03-28T05:45:20+00:00

We need to export ppc64_firmware_features for modules. Before we do that
I think we should probably rename it to powerpc_firmware_features.

Signed-off-by: Michael Ellerman 
Signed-off-by: Paul Mackerras

[PATCH] powerpc: Move pSeries firmware feature setup into platforms/pseries

2006-02-10T05:52:03+00:00

Currently we have some stuff in firmware.h and kernel/firmware.c that is
#ifdef CONFIG_PPC_PSERIES. Move it all into platforms/pseries.

Signed-off-by: Michael Ellerman 
Signed-off-by: Paul Mackerras