linux-kernel - [RFC V2 0/8] Generic IRQ entry/exit support for powerpc

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Message-ID: <20250908210235.137300-2-mchauras@linux.ibm.com>
Date: Tue,  9 Sep 2025 02:32:28 +0530
From: Mukesh Kumar Chaurasiya <mchauras@...ux.ibm.com>
To: maddy@...ux.ibm.com, mpe@...erman.id.au, npiggin@...il.com,
        christophe.leroy@...roup.eu, oleg@...hat.com, kees@...nel.org,
        luto@...capital.net, wad@...omium.org, mchauras@...ux.ibm.com,
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        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [RFC V2 0/8] Generic IRQ entry/exit support for powerpc

Adding support for the generic irq entry/exit handling for PowerPC. The
goal is to bring PowerPC in line with other architectures that already
use the common irq entry infrastructure, reducing duplicated code and
making it easier to share future changes in entry/exit paths.

This is slightly tested on ppc64le.

The performance benchmarks from perf bench basic syscall are below:

| Metric     | W/O Generic Framework | With Generic Framework | Improvement |
| ---------- | --------------------- | ---------------------- | ----------- |
| Total time | 0.885 [sec]           | 0.880 [sec]            | ~0.56%      |
| usecs/op   | 0.088518              | 0.088005               | ~0.58%      |
| ops/sec    | 1,12,97,086           | 1,13,62,977            | ~0.58%      |

Thats close to 0.6% improvement with this.

Changelog:
V1 -> V2: Support added for irq with generic framework.

Mukesh Kumar Chaurasiya (8):
  powerpc: rename arch_irq_disabled_regs
  powerpc: Prepare to build with generic entry/exit framework
  powerpc: introduce arch_enter_from_user_mode
  powerpc: Introduce syscall exit arch functions
  powerpc: add exit_flags field in pt_regs
  powerpc: Prepare for IRQ entry exit
  powerpc: Enable IRQ generic entry/exit path.
  powerpc: Enable Generic Entry/Exit for syscalls.

 arch/powerpc/Kconfig                    |   2 +
 arch/powerpc/include/asm/entry-common.h | 550 ++++++++++++++++++++++++
 arch/powerpc/include/asm/hw_irq.h       |   4 +-
 arch/powerpc/include/asm/interrupt.h    | 393 +++--------------
 arch/powerpc/include/asm/ptrace.h       |   2 +
 arch/powerpc/include/asm/stacktrace.h   |   8 +
 arch/powerpc/include/asm/syscall.h      |   5 +
 arch/powerpc/include/asm/thread_info.h  |   1 +
 arch/powerpc/include/uapi/asm/ptrace.h  |  14 +-
 arch/powerpc/kernel/asm-offsets.c       |   1 +
 arch/powerpc/kernel/interrupt.c         | 251 ++---------
 arch/powerpc/kernel/interrupt_64.S      |   2 -
 arch/powerpc/kernel/ptrace/ptrace.c     | 142 +-----
 arch/powerpc/kernel/signal.c            |   8 +
 arch/powerpc/kernel/syscall.c           | 119 +----
 arch/powerpc/kernel/traps.c             |   2 +-
 arch/powerpc/kernel/watchdog.c          |   2 +-
 arch/powerpc/perf/core-book3s.c         |   2 +-
 18 files changed, 698 insertions(+), 810 deletions(-)
 create mode 100644 arch/powerpc/include/asm/entry-common.h

-- 
2.51.0