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Wed, 20 May 2020 04:13:21 -0700 (PDT) From: Sumit Garg To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 4/4] arm64: kgdb: Round up cpus using IPI_CALL_NMI_FUNC Date: Wed, 20 May 2020 16:41:55 +0530 Message-Id: <1589973115-14757-5-git-send-email-sumit.garg@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1589973115-14757-1-git-send-email-sumit.garg@linaro.org> References: <1589973115-14757-1-git-send-email-sumit.garg@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200520_041323_942547_53883807 X-CRM114-Status: GOOD ( 13.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sumit Garg , daniel.thompson@linaro.org, jason@lakedaemon.net, catalin.marinas@arm.com, jason.wessel@windriver.com, dianders@chromium.org, linux-kernel@vger.kernel.org, maz@kernel.org, kgdb-bugreport@lists.sourceforge.net, tglx@linutronix.de, will@kernel.org, julien.thierry.kdev@gmail.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org arm64 platforms with GICv3 or later supports pseudo NMIs which can be leveraged to round up CPUs which are stuck in hard lockup state with interrupts disabled that wouldn't be possible with a normal IPI. So instead switch to round up CPUs using IPI_CALL_NMI_FUNC. And in case a particular arm64 platform doesn't supports pseudo NMIs, IPI_CALL_NMI_FUNC will act as a normal IPI which maintains existing kgdb functionality. Signed-off-by: Sumit Garg --- arch/arm64/include/asm/kgdb.h | 8 ++++++++ arch/arm64/kernel/kgdb.c | 21 +++++++++++++++++++++ arch/arm64/kernel/smp.c | 3 ++- 3 files changed, 31 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kgdb.h b/arch/arm64/include/asm/kgdb.h index 21fc85e..6f3d3af 100644 --- a/arch/arm64/include/asm/kgdb.h +++ b/arch/arm64/include/asm/kgdb.h @@ -24,6 +24,14 @@ static inline void arch_kgdb_breakpoint(void) extern void kgdb_handle_bus_error(void); extern int kgdb_fault_expected; +#ifdef CONFIG_KGDB +extern void ipi_kgdb_nmicallback(int cpu, void *regs); +#else +static inline void ipi_kgdb_nmicallback(int cpu, void *regs) +{ +} +#endif + #endif /* !__ASSEMBLY__ */ /* diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c index 4311992..ee932ba 100644 --- a/arch/arm64/kernel/kgdb.c +++ b/arch/arm64/kernel/kgdb.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -353,3 +354,23 @@ int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) return aarch64_insn_write((void *)bpt->bpt_addr, *(u32 *)bpt->saved_instr); } + +void ipi_kgdb_nmicallback(int cpu, void *regs) +{ + if (atomic_read(&kgdb_active) != -1) + kgdb_nmicallback(cpu, regs); +} + +#ifdef CONFIG_SMP +void kgdb_roundup_cpus(void) +{ + struct cpumask mask; + + cpumask_copy(&mask, cpu_online_mask); + cpumask_clear_cpu(raw_smp_processor_id(), &mask); + if (cpumask_empty(&mask)) + return; + + arch_send_call_nmi_func_ipi_mask(&mask); +} +#endif diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index c5e42a1..3baace7 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -958,7 +959,7 @@ static void do_handle_IPI(int ipinr) #endif case IPI_CALL_NMI_FUNC: - /* nop, IPI handlers for special features can be added here. */ + ipi_kgdb_nmicallback(cpu, get_irq_regs()); break; default: -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel