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Mon, 29 Dec 2025 04:54:51 +0000 (GMT) From: Mukesh Kumar Chaurasiya To: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, oleg@redhat.com, kees@kernel.org, luto@amacapital.net, wad@chromium.org, mchauras@linux.ibm.com, thuth@redhat.com, sshegde@linux.ibm.com, akpm@linux-foundation.org, macro@orcam.me.uk, deller@gmx.de, ldv@strace.io, charlie@rivosinc.com, segher@kernel.crashing.org, bigeasy@linutronix.de, peterz@infradead.org, namcao@linutronix.de, tglx@linutronix.de, kan.liang@linux.intel.com, mark.barnett@arm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: Mukesh Kumar Chaurasiya Subject: [PATCH v3 0/8] Generic IRQ entry/exit support for powerpc Date: Mon, 29 Dec 2025 10:24:08 +0530 Message-ID: <20251229045416.3193779-1-mkchauras@linux.ibm.com> X-Mailer: git-send-email 2.52.0 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; 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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 of ppc64le and ppc32. The performance benchmarks are below: perf bench syscall usec/op | Syscall | Base | New | change % | | ------- | ---------- | ---------- | -------- | | basic | 0.173212 | 0.133294 | -23.05 | | execve | 363.176190 | 357.148150 | -1.66 | | fork | 853.657880 | 840.268800 | -1.57 | | getpgid | 0.174832 | 0.135372 | -22.57 | perf bench syscall ops/sec | Syscall | Base | New | change % | | ------- | ------- | ------- | -------- | | basic | 6006021 | 7502236 | +24.91 | | execve | 2753 | 2800 | +1.71 | | fork | 1171 | 1190 | +1.62 | | getpgid | 5942117 | 7387040 | +24.32 | IPI latency benchmark | Metric | Base (ns) | Test (ns) | change % | | -------------- | ------------- | ------------- | -------- | | Dry-run | 206652.45 | 209317.37 | +1.29 | | Self-IPI | 3567895.23 | 3590444.77 | +0.63 | | Normal IPI | 148570416.17 | 148564173.40 | -0.00 | | Broadcast IPI | 4033489673.38 | 4007319512.62 | -0.65 | | Broadcast lock | 4011023005.48 | 4010267885.93 | -0.02 | Thats very close to performance earlier with arch specific handling. Tests done: - Build and boot on ppc64le pseries. - Build and boot on ppc64le powernv8 powernv9 powernv10. - Build and boot on ppc32. - Performance benchmark done with perf syscall basic on pseries. Changelog: V2 -> V3 - #ifdef CONFIG_GENERIC_IRQ_ENTRY removed from unnecessary places - Some functions made __always_inline - pt_regs padding changed to match 16byte interrupt stack alignment - And some cosmetic changes from reviews from earlier patch V2: https://lore.kernel.org/all/20251214130245.43664-1-mkchauras@linux.ibm.com/ V1 -> V2 - Fix an issue where context tracking was showing warnings for incorrect context V1: https://lore.kernel.org/all/20251102115358.1744304-1-mkchauras@linux.ibm.com/ RFC -> PATCH V1 - Fix for ppc32 spitting out kuap lock warnings. - ppc64le powernv8 crash fix. - Review comments incorporated from previous RFC. RFC https://lore.kernel.org/all/20250908210235.137300-2-mchauras@linux.ibm.com/ 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 | 533 ++++++++++++++++++++++++ arch/powerpc/include/asm/hw_irq.h | 4 +- arch/powerpc/include/asm/interrupt.h | 386 +++-------------- arch/powerpc/include/asm/ptrace.h | 6 +- arch/powerpc/include/asm/signal.h | 1 - arch/powerpc/include/asm/stacktrace.h | 6 + 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/interrupt.c | 255 ++---------- arch/powerpc/kernel/ptrace/ptrace.c | 142 +------ arch/powerpc/kernel/signal.c | 25 +- 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 +- 17 files changed, 681 insertions(+), 824 deletions(-) create mode 100644 arch/powerpc/include/asm/entry-common.h -- 2.52.0