kernel/linux.git/arch/powerpc/include/asm/dbell.h, branch linux-7.0.y

powerpc: Remove duplicate definition for ppc_msgsnd_sync()

2025-09-06T11:32:55+00:00

Remove duplicate definition of ppc_msgsnd_sync() introduced in commit b87ac0218355 ("powerpc: Introduce msgsnd/doorbell barrier primitives"). No functional change intended. Signed-off-by: Gautam Menghani Reviewed-by: Ritesh Harjani (IBM) [maddy: Updated commit message to fixed checkpatch.pl warning] Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/20250813122319.62278-1-gautam@linux.ibm.com

powerpc: Inline doorbell sending functions

2020-07-29T11:02:09+00:00

These are only called in one place for a given platform, so inline them for performance. Signed-off-by: Nicholas Piggin Tested-by: Cédric Le Goater [mpe: Fix build errors related to KVM] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200726035155.1424103-2-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: clean inclusions of asm/feature-fixups.h

2018-07-30T12:48:17+00:00

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

2018-07-30T12:47:54+00:00

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

2017-06-19T09:46:27+00:00

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

2017-04-13T13:34:34+00:00

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

2017-04-13T13:34:34+00:00

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

2017-04-13T13:34:33+00:00

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

2017-04-13T13:34:33+00:00

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