From: Suzuki.Poulose@arm.com (Suzuki K Poulose)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v22 3/8] arm64: kdump: implement machine_crash_shutdown()
Date: Wed, 13 Jul 2016 10:32:39 +0100 [thread overview]
Message-ID: <f8a6a1c7-27ed-9d2f-7d4b-7a81676c2f9c@arm.com> (raw)
In-Reply-To: <20160712050514.22307-4-takahiro.akashi@linaro.org>
On 12/07/16 06:05, AKASHI Takahiro wrote:
> Primary kernel calls machine_crash_shutdown() to shut down non-boot cpus
> and save registers' status in per-cpu ELF notes before starting crash
> dump kernel. See kernel_kexec().
> Even if not all secondary cpus have shut down, we do kdump anyway.
>
> As we don't have to make non-boot(crashed) cpus offline (to preserve
> correct status of cpus at crash dump) before shutting down, this patch
> also adds a variant of smp_send_stop().
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> ---
> arch/arm64/include/asm/hardirq.h | 2 +-
> arch/arm64/include/asm/kexec.h | 41 ++++++++++++++++++++++++-
> arch/arm64/include/asm/smp.h | 2 ++
> arch/arm64/kernel/machine_kexec.c | 56 ++++++++++++++++++++++++++++++++--
> arch/arm64/kernel/smp.c | 64 +++++++++++++++++++++++++++++++++++++++
> 5 files changed, 160 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h
> index 8740297..1473fc2 100644
> --- a/arch/arm64/include/asm/hardirq.h
> +++ b/arch/arm64/include/asm/hardirq.h
> @@ -20,7 +20,7 @@
> #include <linux/threads.h>
> #include <asm/irq.h>
>
> -#define NR_IPI 6
> +#define NR_IPI 7
>
> typedef struct {
> unsigned int __softirq_pending;
> diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h
> index 04744dc..a908958 100644
> --- a/arch/arm64/include/asm/kexec.h
> +++ b/arch/arm64/include/asm/kexec.h
> @@ -40,7 +40,46 @@
> static inline void crash_setup_regs(struct pt_regs *newregs,
> struct pt_regs *oldregs)
> {
> - /* Empty routine needed to avoid build errors. */
> + if (oldregs) {
> + memcpy(newregs, oldregs, sizeof(*newregs));
> + } else {
> + u64 tmp1, tmp2;
> +
> + __asm__ __volatile__ (
> + "stp x0, x1, [%2, #16 * 0]\n"
> + "stp x2, x3, [%2, #16 * 1]\n"
> + "stp x4, x5, [%2, #16 * 2]\n"
> + "stp x6, x7, [%2, #16 * 3]\n"
> + "stp x8, x9, [%2, #16 * 4]\n"
> + "stp x10, x11, [%2, #16 * 5]\n"
> + "stp x12, x13, [%2, #16 * 6]\n"
> + "stp x14, x15, [%2, #16 * 7]\n"
> + "stp x16, x17, [%2, #16 * 8]\n"
> + "stp x18, x19, [%2, #16 * 9]\n"
> + "stp x20, x21, [%2, #16 * 10]\n"
> + "stp x22, x23, [%2, #16 * 11]\n"
> + "stp x24, x25, [%2, #16 * 12]\n"
> + "stp x26, x27, [%2, #16 * 13]\n"
> + "stp x28, x29, [%2, #16 * 14]\n"
> + "mov %0, sp\n"
> + "stp x30, %0, [%2, #16 * 15]\n"
> +
> + "/* faked current PSTATE */\n"
> + "mrs %0, CurrentEL\n"
> + "mrs %1, DAIF\n"
> + "orr %0, %0, %1\n"
> + "mrs %1, NZCV\n"
> + "orr %0, %0, %1\n"
> +
> + /* pc */
> + "adr %1, 1f\n"
> + "1:\n"
> + "stp %1, %0, [%2, #16 * 16]\n"
> + : "=r" (tmp1), "=r" (tmp2), "+r" (newregs)
> + :
> + : "memory"
> + );
> + }
> }
>
> #endif /* __ASSEMBLY__ */
> diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
> index 0226447..6b0f2c7 100644
> --- a/arch/arm64/include/asm/smp.h
> +++ b/arch/arm64/include/asm/smp.h
> @@ -136,6 +136,8 @@ static inline void cpu_panic_kernel(void)
> */
> bool cpus_are_stuck_in_kernel(void);
>
> +extern void smp_send_crash_stop(void);
> +
> #endif /* ifndef __ASSEMBLY__ */
>
> #endif /* ifndef __ASM_SMP_H */
> diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
> index bc96c8a..8ac9dba8 100644
> --- a/arch/arm64/kernel/machine_kexec.c
> +++ b/arch/arm64/kernel/machine_kexec.c
> @@ -9,6 +9,9 @@
> * published by the Free Software Foundation.
> */
>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> #include <linux/kexec.h>
> #include <linux/smp.h>
>
> @@ -22,6 +25,7 @@
> extern const unsigned char arm64_relocate_new_kernel[];
> extern const unsigned long arm64_relocate_new_kernel_size;
>
> +bool in_crash_kexec;
> static unsigned long kimage_start;
>
> /**
> @@ -148,7 +152,8 @@ void machine_kexec(struct kimage *kimage)
> /*
> * New cpus may have become stuck_in_kernel after we loaded the image.
> */
> - BUG_ON(cpus_are_stuck_in_kernel() || (num_online_cpus() > 1));
> + BUG_ON((cpus_are_stuck_in_kernel() || (num_online_cpus() > 1)) &&
> + !WARN_ON(in_crash_kexec));
>
> reboot_code_buffer_phys = page_to_phys(kimage->control_code_page);
> reboot_code_buffer = phys_to_virt(reboot_code_buffer_phys);
> @@ -200,13 +205,58 @@ void machine_kexec(struct kimage *kimage)
> * relocation is complete.
> */
>
> - cpu_soft_restart(1, reboot_code_buffer_phys, kimage->head,
> + cpu_soft_restart(!in_crash_kexec, reboot_code_buffer_phys, kimage->head,
> kimage_start, 0);
>
> BUG(); /* Should never get here. */
> }
>
> +static void machine_kexec_mask_interrupts(void)
> +{
> + unsigned int i;
> + struct irq_desc *desc;
> +
> + for_each_irq_desc(i, desc) {
> + struct irq_chip *chip;
> + int ret;
> +
> + chip = irq_desc_get_chip(desc);
> + if (!chip)
> + continue;
> +
> + /*
> + * First try to remove the active state. If this
> + * fails, try to EOI the interrupt.
> + */
> + ret = irq_set_irqchip_state(i, IRQCHIP_STATE_ACTIVE, false);
> +
> + if (ret && irqd_irq_inprogress(&desc->irq_data) &&
> + chip->irq_eoi)
> + chip->irq_eoi(&desc->irq_data);
> +
> + if (chip->irq_mask)
> + chip->irq_mask(&desc->irq_data);
> +
> + if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
> + chip->irq_disable(&desc->irq_data);
> + }
> +}
> +
> +/**
> + * machine_crash_shutdown - shutdown non-crashing cpus and save registers
> + */
> void machine_crash_shutdown(struct pt_regs *regs)
> {
> - /* Empty routine needed to avoid build errors. */
> + local_irq_disable();
> +
> + in_crash_kexec = true;
> +
> + /* shutdown non-crashing cpus */
> + smp_send_crash_stop();
> +
> + /* for crashing cpu */
> + crash_save_cpu(regs, smp_processor_id());
> + machine_kexec_mask_interrupts();
> +
> + pr_info("Starting crashdump kernel...\n");
> }
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 62ff3c0..66923db 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -37,6 +37,7 @@
> #include <linux/completion.h>
> #include <linux/of.h>
> #include <linux/irq_work.h>
> +#include <linux/kexec.h>
>
> #include <asm/alternative.h>
> #include <asm/atomic.h>
> @@ -71,6 +72,7 @@ enum ipi_msg_type {
> IPI_RESCHEDULE,
> IPI_CALL_FUNC,
> IPI_CPU_STOP,
> + IPI_CPU_CRASH_STOP,
> IPI_TIMER,
> IPI_IRQ_WORK,
> IPI_WAKEUP
> @@ -726,6 +728,7 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = {
> S(IPI_RESCHEDULE, "Rescheduling interrupts"),
> S(IPI_CALL_FUNC, "Function call interrupts"),
> S(IPI_CPU_STOP, "CPU stop interrupts"),
> + S(IPI_CPU_CRASH_STOP, "CPU stop (for crash dump) interrupts"),
> S(IPI_TIMER, "Timer broadcast interrupts"),
> S(IPI_IRQ_WORK, "IRQ work interrupts"),
> S(IPI_WAKEUP, "CPU wake-up interrupts"),
> @@ -800,6 +803,30 @@ static void ipi_cpu_stop(unsigned int cpu)
> cpu_relax();
> }
>
> +#ifdef CONFIG_KEXEC_CORE
> +static atomic_t waiting_for_crash_ipi;
> +#endif
> +
> +static void ipi_cpu_crash_stop(unsigned int cpu, struct pt_regs *regs)
> +{
> +#ifdef CONFIG_KEXEC_CORE
> + crash_save_cpu(regs, cpu);
> +
> + atomic_dec(&waiting_for_crash_ipi);
> +
> + local_irq_disable();
> +
> +#ifdef CONFIG_HOTPLUG_CPU
> + if (cpu_ops[cpu]->cpu_die)
> + cpu_ops[cpu]->cpu_die(cpu);
> +#endif
> +
> + /* just in case */
> + while (1)
> + wfi();
You could use cpu_park_loop() (defined in asm/smp.h) here instead,
which also includes wfe();
Suzuki
next prev parent reply other threads:[~2016-07-13 9:32 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-12 5:05 [PATCH v22 0/8] arm64: add kdump support AKASHI Takahiro
2016-07-12 5:05 ` [PATCH v22 1/8] arm64: kdump: reserve memory for crash dump kernel AKASHI Takahiro
2016-07-13 9:12 ` Suzuki K Poulose
2016-07-13 15:42 ` AKASHI Takahiro
2016-07-19 9:39 ` Dennis Chen
2016-07-19 10:28 ` AKASHI Takahiro
2016-07-19 10:41 ` Dennis Chen
2016-07-19 12:48 ` Mark Salter
2016-07-19 13:27 ` Mark Rutland
2016-07-20 2:17 ` AKASHI Takahiro
2016-07-20 3:48 ` Dennis Chen
2016-07-19 23:34 ` AKASHI Takahiro
2016-07-12 5:05 ` [PATCH v22 2/8] arm64: limit memory regions based on DT property, usable-memory-range AKASHI Takahiro
2016-07-18 18:04 ` James Morse
2016-07-19 8:35 ` AKASHI Takahiro
2016-07-19 10:06 ` Dennis Chen
2016-07-19 11:01 ` AKASHI Takahiro
2016-07-20 3:39 ` Dennis Chen
2016-07-20 4:22 ` AKASHI Takahiro
2016-07-20 4:36 ` Dennis Chen
2016-07-21 0:57 ` AKASHI Takahiro
2016-07-22 13:55 ` James Morse
2016-07-25 5:27 ` AKASHI Takahiro
2016-08-04 6:21 ` AKASHI Takahiro
2016-08-09 16:22 ` James Morse
2016-07-12 5:05 ` [PATCH v22 3/8] arm64: kdump: implement machine_crash_shutdown() AKASHI Takahiro
2016-07-13 9:32 ` Suzuki K Poulose [this message]
2016-07-13 16:00 ` AKASHI Takahiro
2016-07-12 5:05 ` [PATCH v22 4/8] arm64: kdump: add kdump support AKASHI Takahiro
2016-07-12 5:05 ` [PATCH v22 5/8] arm64: kdump: add VMCOREINFO's for user-space coredump tools AKASHI Takahiro
2016-07-12 5:05 ` [PATCH v22 6/8] arm64: kdump: enable kdump in the arm64 defconfig AKASHI Takahiro
2016-07-12 5:05 ` [PATCH v22 7/8] arm64: kdump: update a kernel doc AKASHI Takahiro
2016-07-12 5:05 ` [PATCH v22 8/8] Documentation: dt: chosen properties for arm64 kdump AKASHI Takahiro
2016-07-12 10:07 ` Mark Rutland
2016-07-13 15:14 ` AKASHI Takahiro
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