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Thu, 27 Nov 2025 04:54:07 -0800 (PST) From: Yunhui Cui To: conor@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, cuiyunhui@bytedance.com, luxu.kernel@bytedance.com, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, jassisinghbrar@gmail.com, conor.dooley@microchip.com, valentina.fernandezalanis@microchip.com, catalin.marinas@arm.com, will@kernel.org, maz@kernel.org, timothy.hayes@arm.com, lpieralisi@kernel.org, arnd@arndb.de, kees@kernel.org, tglx@linutronix.de, viresh.kumar@linaro.org, boqun.feng@gmail.com, linux-arm-kernel@lists.infradead.org, cleger@rivosinc.com, atishp@rivosinc.com, ajones@ventanamicro.com Subject: [PATCH v3 6/8] riscv: smp: use NMI for backtrace Date: Thu, 27 Nov 2025 20:53:03 +0800 Message-Id: <20251127125305.89961-7-cuiyunhui@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) In-Reply-To: <20251127125305.89961-1-cuiyunhui@bytedance.com> References: <20251127125305.89961-1-cuiyunhui@bytedance.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use NMI instead of IPI for backtrace if RISC-V SSE NMI is supported. Signed-off-by: Yunhui Cui --- arch/riscv/kernel/smp.c | 12 +++++++++++- drivers/firmware/riscv/riscv_sse_nmi.c | 2 ++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c index bca95ec0b0f74..6d9a67c2c2a6e 100644 --- a/arch/riscv/kernel/smp.c +++ b/arch/riscv/kernel/smp.c @@ -342,9 +342,19 @@ static void riscv_backtrace_ipi(cpumask_t *mask) send_ipi_mask(mask, IPI_CPU_BACKTRACE); } =20 +static void riscv_backtrace_nmi(cpumask_t *mask) +{ + send_nmi_mask(mask, LOCAL_NMI_BACKTRACE); +} + void arch_trigger_cpumask_backtrace(const cpumask_t *mask, int exclude_cpu) { - nmi_trigger_cpumask_backtrace(mask, exclude_cpu, riscv_backtrace_ipi); + if (!nmi_support()) + nmi_trigger_cpumask_backtrace(mask, exclude_cpu, + riscv_backtrace_ipi); + else + nmi_trigger_cpumask_backtrace(mask, exclude_cpu, + riscv_backtrace_nmi); } =20 #ifdef CONFIG_KGDB diff --git a/drivers/firmware/riscv/riscv_sse_nmi.c b/drivers/firmware/risc= v/riscv_sse_nmi.c index 02e2de2bb70f7..a138d6bdbc0d1 100644 --- a/drivers/firmware/riscv/riscv_sse_nmi.c +++ b/drivers/firmware/riscv/riscv_sse_nmi.c @@ -3,6 +3,7 @@ #define pr_fmt(fmt) "SSE NMI: " fmt =20 #include +#include #include #include =20 @@ -59,6 +60,7 @@ static int local_nmi_handler(u32 evt, void *arg, struct p= t_regs *regs) =20 NMI_HANDLE(LOCAL_NMI_CRASH, cpu_crash_stop, cpu, regs); NMI_HANDLE(LOCAL_NMI_STOP, cpu_stop); + NMI_HANDLE(LOCAL_NMI_BACKTRACE, nmi_cpu_backtrace, regs); =20 atomic_andnot(type, this_cpu_ptr(&local_nmi)); =20 --=20 2.39.5