kernel/arch/powerpc/include/asm/dbell.h, branch linux-5.2.y

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

2019-05-30T18:26:32Z

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: clean inclusions of asm/feature-fixups.h

2018-07-30T12:48:17Z

files not using feature fixup don't need asm/feature-fixups.h files using feature fixup need asm/feature-fixups.h Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc: remove unneeded inclusions of cpu_has_feature.h

2018-07-30T12:47:54Z

Files not using cpu_has_feature() don't need cpu_has_feature.h Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman

powerpc/64s: msgclr when handling doorbell exceptions from system reset

2017-06-19T09:46:27Z

msgsnd doorbell exceptions are cleared when the doorbell interrupt is taken. However if a doorbell exception causes a system reset interrupt wake from power saving state, the message is not cleared. Processing the doorbell from the system reset interrupt requires msgclr to avoid taking the exception again. Testing this plus the previous wakup direct patch gives: original wakeup direct msgclr Different threads, same core: 315k/s 264k/s 345k/s Different cores: 235k/s 242k/s 242k/s Net speedup is +10% for same core, and +3% for different core. Reviewed-by: Gautham R. Shenoy Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman

powerpc/powernv: POWER9 support for msgsnd/doorbell IPI

2017-04-13T13:34:34Z

POWER9 requires msgsync for receiver-side synchronization, and a DD1 workaround restricts IPIs to core-local. Signed-off-by: Nicholas Piggin [mpe: Drop no longer needed asm feature macro changes] Signed-off-by: Michael Ellerman

powerpc/64s: Avoid a branch for ppc_msgsnd

2017-04-13T13:34:34Z

IPIs are a pretty hot path and we already have the ability to do asm feature patching, so use it. Signed-off-by: Nicholas Piggin [mpe: Change log detail] Signed-off-by: Michael Ellerman

powerpc: Introduce msgsnd/doorbell barrier primitives

2017-04-13T13:34:33Z

POWER9 changes requirements and adds new instructions for synchronization. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman

powerpc: Change the doorbell IPI calling convention

2017-04-13T13:34:33Z

Change the doorbell callers to know about their msgsnd addressing, rather than have them set a per-cpu target data tag at boot that gets sent to the cause_ipi functions. The data is only used for doorbell IPI functions, no other IPI types, so it makes sense to keep that detail local to doorbell. Have the platform code understand doorbell IPIs, rather than the interrupt controller code understand them. Platform code can look at capabilities it has available and decide which to use. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman

powerpc: Move cpu_has_feature() to a separate file

2016-08-01T01:15:03Z

We plan to use jump label for cpu_has_feature(). In order to implement this we need to include the linux/jump_label.h in asm/cputable.h. Unfortunately if we do that it leads to an include loop. The root of the problem seems to be that reg.h needs cputable.h (for CPU_FTRs), and then cputable.h via jump_label.h eventually pulls in hw_irq.h which needs reg.h (for MSR_EE). So move cpu_has_feature() to a separate file on its own. Signed-off-by: Kevin Hao Signed-off-by: Aneesh Kumar K.V [mpe: Rename to cpu_has_feature.h and flesh out change log] Signed-off-by: Michael Ellerman

powerpc: Select either privileged or hypervisor doorbell when sending

2013-01-10T04:09:06Z

On book3s we have two msgsnd instructions with differing privilege levels. This patch selects the appropriate instruction to use whenever we send a doorbell interrupt. Signed-off-by: Ian Munsie Tested-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt