mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 21:40:52 +07:00
Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 UV debug changes from Ingo Molnar: "Various SGI UV debuggability improvements, amongst them KDB support, with related core KDB enabling patches changing kernel/debug/kdb/" * 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: Revert "x86/UV: Add uvtrace support" x86/UV: Add call to KGDB/KDB from NMI handler kdb: Add support for external NMI handler to call KGDB/KDB x86/UV: Check for alloc_cpumask_var() failures properly in uv_nmi_setup() x86/UV: Add uvtrace support x86/UV: Add kdump to UV NMI handler x86/UV: Add summary of cpu activity to UV NMI handler x86/UV: Update UV support for external NMI signals x86/UV: Move NMI support
This commit is contained in:
Linus Torvalds
commit
9b66bfb280
@ -12,6 +12,7 @@ extern enum uv_system_type get_uv_system_type(void);
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extern int is_uv_system(void);
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extern void uv_cpu_init(void);
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extern void uv_nmi_init(void);
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extern void uv_register_nmi_notifier(void);
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extern void uv_system_init(void);
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extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
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struct mm_struct *mm,
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@ -25,6 +26,7 @@ static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; }
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static inline int is_uv_system(void) { return 0; }
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static inline void uv_cpu_init(void) { }
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static inline void uv_system_init(void) { }
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static inline void uv_register_nmi_notifier(void) { }
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static inline const struct cpumask *
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uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm,
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unsigned long start, unsigned long end, unsigned int cpu)
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@ -502,8 +502,8 @@ struct uv_blade_info {
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unsigned short nr_online_cpus;
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unsigned short pnode;
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short memory_nid;
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spinlock_t nmi_lock;
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unsigned long nmi_count;
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spinlock_t nmi_lock; /* obsolete, see uv_hub_nmi */
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unsigned long nmi_count; /* obsolete, see uv_hub_nmi */
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};
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extern struct uv_blade_info *uv_blade_info;
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extern short *uv_node_to_blade;
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@ -576,6 +576,59 @@ static inline int uv_num_possible_blades(void)
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return uv_possible_blades;
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}
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/* Per Hub NMI support */
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extern void uv_nmi_setup(void);
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/* BMC sets a bit this MMR non-zero before sending an NMI */
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#define UVH_NMI_MMR UVH_SCRATCH5
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#define UVH_NMI_MMR_CLEAR UVH_SCRATCH5_ALIAS
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#define UVH_NMI_MMR_SHIFT 63
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#define UVH_NMI_MMR_TYPE "SCRATCH5"
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/* Newer SMM NMI handler, not present in all systems */
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#define UVH_NMI_MMRX UVH_EVENT_OCCURRED0
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#define UVH_NMI_MMRX_CLEAR UVH_EVENT_OCCURRED0_ALIAS
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#define UVH_NMI_MMRX_SHIFT (is_uv1_hub() ? \
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UV1H_EVENT_OCCURRED0_EXTIO_INT0_SHFT :\
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UVXH_EVENT_OCCURRED0_EXTIO_INT0_SHFT)
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#define UVH_NMI_MMRX_TYPE "EXTIO_INT0"
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/* Non-zero indicates newer SMM NMI handler present */
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#define UVH_NMI_MMRX_SUPPORTED UVH_EXTIO_INT0_BROADCAST
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/* Indicates to BIOS that we want to use the newer SMM NMI handler */
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#define UVH_NMI_MMRX_REQ UVH_SCRATCH5_ALIAS_2
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#define UVH_NMI_MMRX_REQ_SHIFT 62
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struct uv_hub_nmi_s {
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raw_spinlock_t nmi_lock;
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atomic_t in_nmi; /* flag this node in UV NMI IRQ */
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atomic_t cpu_owner; /* last locker of this struct */
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atomic_t read_mmr_count; /* count of MMR reads */
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atomic_t nmi_count; /* count of true UV NMIs */
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unsigned long nmi_value; /* last value read from NMI MMR */
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};
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struct uv_cpu_nmi_s {
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struct uv_hub_nmi_s *hub;
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atomic_t state;
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atomic_t pinging;
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int queries;
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int pings;
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};
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DECLARE_PER_CPU(struct uv_cpu_nmi_s, __uv_cpu_nmi);
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#define uv_cpu_nmi (__get_cpu_var(__uv_cpu_nmi))
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#define uv_hub_nmi (uv_cpu_nmi.hub)
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#define uv_cpu_nmi_per(cpu) (per_cpu(__uv_cpu_nmi, cpu))
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#define uv_hub_nmi_per(cpu) (uv_cpu_nmi_per(cpu).hub)
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/* uv_cpu_nmi_states */
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#define UV_NMI_STATE_OUT 0
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#define UV_NMI_STATE_IN 1
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#define UV_NMI_STATE_DUMP 2
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#define UV_NMI_STATE_DUMP_DONE 3
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/* Update SCIR state */
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static inline void uv_set_scir_bits(unsigned char value)
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{
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@ -460,6 +460,23 @@ union uvh_event_occurred0_u {
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#define UVH_EVENT_OCCURRED0_ALIAS_32 0x5f0
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/* ========================================================================= */
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/* UVH_EXTIO_INT0_BROADCAST */
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/* ========================================================================= */
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#define UVH_EXTIO_INT0_BROADCAST 0x61448UL
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#define UVH_EXTIO_INT0_BROADCAST_32 0x3f0
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#define UVH_EXTIO_INT0_BROADCAST_ENABLE_SHFT 0
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#define UVH_EXTIO_INT0_BROADCAST_ENABLE_MASK 0x0000000000000001UL
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union uvh_extio_int0_broadcast_u {
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unsigned long v;
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struct uvh_extio_int0_broadcast_s {
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unsigned long enable:1; /* RW */
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unsigned long rsvd_1_63:63;
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} s;
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};
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/* ========================================================================= */
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/* UVH_GR0_TLB_INT0_CONFIG */
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/* ========================================================================= */
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@ -2605,6 +2622,20 @@ union uvh_scratch5_u {
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} s;
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};
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/* ========================================================================= */
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/* UVH_SCRATCH5_ALIAS */
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/* ========================================================================= */
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#define UVH_SCRATCH5_ALIAS 0x2d0208UL
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#define UVH_SCRATCH5_ALIAS_32 0x780
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/* ========================================================================= */
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/* UVH_SCRATCH5_ALIAS_2 */
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/* ========================================================================= */
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#define UVH_SCRATCH5_ALIAS_2 0x2d0210UL
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#define UVH_SCRATCH5_ALIAS_2_32 0x788
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/* ========================================================================= */
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/* UVXH_EVENT_OCCURRED2 */
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/* ========================================================================= */
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@ -39,12 +39,6 @@
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#include <asm/x86_init.h>
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#include <asm/nmi.h>
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/* BMC sets a bit this MMR non-zero before sending an NMI */
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#define UVH_NMI_MMR UVH_SCRATCH5
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#define UVH_NMI_MMR_CLEAR (UVH_NMI_MMR + 8)
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#define UV_NMI_PENDING_MASK (1UL << 63)
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DEFINE_PER_CPU(unsigned long, cpu_last_nmi_count);
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DEFINE_PER_CPU(int, x2apic_extra_bits);
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#define PR_DEVEL(fmt, args...) pr_devel("%s: " fmt, __func__, args)
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@ -58,7 +52,6 @@ int uv_min_hub_revision_id;
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EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);
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unsigned int uv_apicid_hibits;
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EXPORT_SYMBOL_GPL(uv_apicid_hibits);
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static DEFINE_SPINLOCK(uv_nmi_lock);
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static struct apic apic_x2apic_uv_x;
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@ -847,68 +840,6 @@ void uv_cpu_init(void)
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set_x2apic_extra_bits(uv_hub_info->pnode);
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}
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/*
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* When NMI is received, print a stack trace.
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*/
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int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
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{
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unsigned long real_uv_nmi;
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int bid;
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/*
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* Each blade has an MMR that indicates when an NMI has been sent
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* to cpus on the blade. If an NMI is detected, atomically
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* clear the MMR and update a per-blade NMI count used to
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* cause each cpu on the blade to notice a new NMI.
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*/
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bid = uv_numa_blade_id();
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real_uv_nmi = (uv_read_local_mmr(UVH_NMI_MMR) & UV_NMI_PENDING_MASK);
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if (unlikely(real_uv_nmi)) {
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spin_lock(&uv_blade_info[bid].nmi_lock);
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real_uv_nmi = (uv_read_local_mmr(UVH_NMI_MMR) & UV_NMI_PENDING_MASK);
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if (real_uv_nmi) {
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uv_blade_info[bid].nmi_count++;
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uv_write_local_mmr(UVH_NMI_MMR_CLEAR, UV_NMI_PENDING_MASK);
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}
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spin_unlock(&uv_blade_info[bid].nmi_lock);
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}
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if (likely(__get_cpu_var(cpu_last_nmi_count) == uv_blade_info[bid].nmi_count))
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return NMI_DONE;
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__get_cpu_var(cpu_last_nmi_count) = uv_blade_info[bid].nmi_count;
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/*
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* Use a lock so only one cpu prints at a time.
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* This prevents intermixed output.
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*/
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spin_lock(&uv_nmi_lock);
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pr_info("UV NMI stack dump cpu %u:\n", smp_processor_id());
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dump_stack();
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spin_unlock(&uv_nmi_lock);
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return NMI_HANDLED;
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}
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void uv_register_nmi_notifier(void)
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{
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if (register_nmi_handler(NMI_UNKNOWN, uv_handle_nmi, 0, "uv"))
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printk(KERN_WARNING "UV NMI handler failed to register\n");
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}
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void uv_nmi_init(void)
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{
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unsigned int value;
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/*
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* Unmask NMI on all cpus
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*/
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value = apic_read(APIC_LVT1) | APIC_DM_NMI;
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value &= ~APIC_LVT_MASKED;
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apic_write(APIC_LVT1, value);
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}
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void __init uv_system_init(void)
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{
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union uvh_rh_gam_config_mmr_u m_n_config;
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@ -1046,6 +977,7 @@ void __init uv_system_init(void)
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map_mmr_high(max_pnode);
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map_mmioh_high(min_pnode, max_pnode);
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uv_nmi_setup();
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uv_cpu_init();
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uv_scir_register_cpu_notifier();
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uv_register_nmi_notifier();
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@ -1 +1 @@
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obj-$(CONFIG_X86_UV) += tlb_uv.o bios_uv.o uv_irq.o uv_sysfs.o uv_time.o
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obj-$(CONFIG_X86_UV) += tlb_uv.o bios_uv.o uv_irq.o uv_sysfs.o uv_time.o uv_nmi.o
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700
arch/x86/platform/uv/uv_nmi.c
Normal file
700
arch/x86/platform/uv/uv_nmi.c
Normal file
@ -0,0 +1,700 @@
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/*
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* SGI NMI support routines
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright (c) 2009-2013 Silicon Graphics, Inc. All Rights Reserved.
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* Copyright (c) Mike Travis
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*/
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <linux/kdb.h>
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#include <linux/kexec.h>
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#include <linux/kgdb.h>
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#include <linux/module.h>
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#include <linux/nmi.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <asm/apic.h>
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#include <asm/current.h>
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#include <asm/kdebug.h>
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#include <asm/local64.h>
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#include <asm/nmi.h>
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#include <asm/traps.h>
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#include <asm/uv/uv.h>
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#include <asm/uv/uv_hub.h>
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#include <asm/uv/uv_mmrs.h>
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/*
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* UV handler for NMI
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*
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* Handle system-wide NMI events generated by the global 'power nmi' command.
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*
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* Basic operation is to field the NMI interrupt on each cpu and wait
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* until all cpus have arrived into the nmi handler. If some cpus do not
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* make it into the handler, try and force them in with the IPI(NMI) signal.
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*
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* We also have to lessen UV Hub MMR accesses as much as possible as this
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* disrupts the UV Hub's primary mission of directing NumaLink traffic and
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* can cause system problems to occur.
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*
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* To do this we register our primary NMI notifier on the NMI_UNKNOWN
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* chain. This reduces the number of false NMI calls when the perf
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* tools are running which generate an enormous number of NMIs per
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* second (~4M/s for 1024 cpu threads). Our secondary NMI handler is
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* very short as it only checks that if it has been "pinged" with the
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* IPI(NMI) signal as mentioned above, and does not read the UV Hub's MMR.
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*
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*/
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static struct uv_hub_nmi_s **uv_hub_nmi_list;
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DEFINE_PER_CPU(struct uv_cpu_nmi_s, __uv_cpu_nmi);
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EXPORT_PER_CPU_SYMBOL_GPL(__uv_cpu_nmi);
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static unsigned long nmi_mmr;
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static unsigned long nmi_mmr_clear;
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static unsigned long nmi_mmr_pending;
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static atomic_t uv_in_nmi;
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static atomic_t uv_nmi_cpu = ATOMIC_INIT(-1);
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static atomic_t uv_nmi_cpus_in_nmi = ATOMIC_INIT(-1);
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static atomic_t uv_nmi_slave_continue;
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static atomic_t uv_nmi_kexec_failed;
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static cpumask_var_t uv_nmi_cpu_mask;
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/* Values for uv_nmi_slave_continue */
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#define SLAVE_CLEAR 0
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#define SLAVE_CONTINUE 1
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#define SLAVE_EXIT 2
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/*
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* Default is all stack dumps go to the console and buffer.
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* Lower level to send to log buffer only.
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*/
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static int uv_nmi_loglevel = 7;
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module_param_named(dump_loglevel, uv_nmi_loglevel, int, 0644);
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/*
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* The following values show statistics on how perf events are affecting
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* this system.
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*/
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static int param_get_local64(char *buffer, const struct kernel_param *kp)
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{
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return sprintf(buffer, "%lu\n", local64_read((local64_t *)kp->arg));
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}
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static int param_set_local64(const char *val, const struct kernel_param *kp)
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{
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/* clear on any write */
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local64_set((local64_t *)kp->arg, 0);
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return 0;
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}
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static struct kernel_param_ops param_ops_local64 = {
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.get = param_get_local64,
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.set = param_set_local64,
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};
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#define param_check_local64(name, p) __param_check(name, p, local64_t)
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static local64_t uv_nmi_count;
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module_param_named(nmi_count, uv_nmi_count, local64, 0644);
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static local64_t uv_nmi_misses;
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module_param_named(nmi_misses, uv_nmi_misses, local64, 0644);
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static local64_t uv_nmi_ping_count;
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module_param_named(ping_count, uv_nmi_ping_count, local64, 0644);
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static local64_t uv_nmi_ping_misses;
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module_param_named(ping_misses, uv_nmi_ping_misses, local64, 0644);
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/*
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* Following values allow tuning for large systems under heavy loading
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*/
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static int uv_nmi_initial_delay = 100;
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module_param_named(initial_delay, uv_nmi_initial_delay, int, 0644);
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static int uv_nmi_slave_delay = 100;
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module_param_named(slave_delay, uv_nmi_slave_delay, int, 0644);
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static int uv_nmi_loop_delay = 100;
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module_param_named(loop_delay, uv_nmi_loop_delay, int, 0644);
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static int uv_nmi_trigger_delay = 10000;
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module_param_named(trigger_delay, uv_nmi_trigger_delay, int, 0644);
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static int uv_nmi_wait_count = 100;
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module_param_named(wait_count, uv_nmi_wait_count, int, 0644);
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static int uv_nmi_retry_count = 500;
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module_param_named(retry_count, uv_nmi_retry_count, int, 0644);
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/*
|
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* Valid NMI Actions:
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* "dump" - dump process stack for each cpu
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* "ips" - dump IP info for each cpu
|
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* "kdump" - do crash dump
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* "kdb" - enter KDB/KGDB (default)
|
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*/
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static char uv_nmi_action[8] = "kdb";
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module_param_string(action, uv_nmi_action, sizeof(uv_nmi_action), 0644);
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static inline bool uv_nmi_action_is(const char *action)
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{
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return (strncmp(uv_nmi_action, action, strlen(action)) == 0);
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}
|
||||
|
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/* Setup which NMI support is present in system */
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static void uv_nmi_setup_mmrs(void)
|
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{
|
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if (uv_read_local_mmr(UVH_NMI_MMRX_SUPPORTED)) {
|
||||
uv_write_local_mmr(UVH_NMI_MMRX_REQ,
|
||||
1UL << UVH_NMI_MMRX_REQ_SHIFT);
|
||||
nmi_mmr = UVH_NMI_MMRX;
|
||||
nmi_mmr_clear = UVH_NMI_MMRX_CLEAR;
|
||||
nmi_mmr_pending = 1UL << UVH_NMI_MMRX_SHIFT;
|
||||
pr_info("UV: SMI NMI support: %s\n", UVH_NMI_MMRX_TYPE);
|
||||
} else {
|
||||
nmi_mmr = UVH_NMI_MMR;
|
||||
nmi_mmr_clear = UVH_NMI_MMR_CLEAR;
|
||||
nmi_mmr_pending = 1UL << UVH_NMI_MMR_SHIFT;
|
||||
pr_info("UV: SMI NMI support: %s\n", UVH_NMI_MMR_TYPE);
|
||||
}
|
||||
}
|
||||
|
||||
/* Read NMI MMR and check if NMI flag was set by BMC. */
|
||||
static inline int uv_nmi_test_mmr(struct uv_hub_nmi_s *hub_nmi)
|
||||
{
|
||||
hub_nmi->nmi_value = uv_read_local_mmr(nmi_mmr);
|
||||
atomic_inc(&hub_nmi->read_mmr_count);
|
||||
return !!(hub_nmi->nmi_value & nmi_mmr_pending);
|
||||
}
|
||||
|
||||
static inline void uv_local_mmr_clear_nmi(void)
|
||||
{
|
||||
uv_write_local_mmr(nmi_mmr_clear, nmi_mmr_pending);
|
||||
}
|
||||
|
||||
/*
|
||||
* If first cpu in on this hub, set hub_nmi "in_nmi" and "owner" values and
|
||||
* return true. If first cpu in on the system, set global "in_nmi" flag.
|
||||
*/
|
||||
static int uv_set_in_nmi(int cpu, struct uv_hub_nmi_s *hub_nmi)
|
||||
{
|
||||
int first = atomic_add_unless(&hub_nmi->in_nmi, 1, 1);
|
||||
|
||||
if (first) {
|
||||
atomic_set(&hub_nmi->cpu_owner, cpu);
|
||||
if (atomic_add_unless(&uv_in_nmi, 1, 1))
|
||||
atomic_set(&uv_nmi_cpu, cpu);
|
||||
|
||||
atomic_inc(&hub_nmi->nmi_count);
|
||||
}
|
||||
return first;
|
||||
}
|
||||
|
||||
/* Check if this is a system NMI event */
|
||||
static int uv_check_nmi(struct uv_hub_nmi_s *hub_nmi)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
int nmi = 0;
|
||||
|
||||
local64_inc(&uv_nmi_count);
|
||||
uv_cpu_nmi.queries++;
|
||||
|
||||
do {
|
||||
nmi = atomic_read(&hub_nmi->in_nmi);
|
||||
if (nmi)
|
||||
break;
|
||||
|
||||
if (raw_spin_trylock(&hub_nmi->nmi_lock)) {
|
||||
|
||||
/* check hub MMR NMI flag */
|
||||
if (uv_nmi_test_mmr(hub_nmi)) {
|
||||
uv_set_in_nmi(cpu, hub_nmi);
|
||||
nmi = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
/* MMR NMI flag is clear */
|
||||
raw_spin_unlock(&hub_nmi->nmi_lock);
|
||||
|
||||
} else {
|
||||
/* wait a moment for the hub nmi locker to set flag */
|
||||
cpu_relax();
|
||||
udelay(uv_nmi_slave_delay);
|
||||
|
||||
/* re-check hub in_nmi flag */
|
||||
nmi = atomic_read(&hub_nmi->in_nmi);
|
||||
if (nmi)
|
||||
break;
|
||||
}
|
||||
|
||||
/* check if this BMC missed setting the MMR NMI flag */
|
||||
if (!nmi) {
|
||||
nmi = atomic_read(&uv_in_nmi);
|
||||
if (nmi)
|
||||
uv_set_in_nmi(cpu, hub_nmi);
|
||||
}
|
||||
|
||||
} while (0);
|
||||
|
||||
if (!nmi)
|
||||
local64_inc(&uv_nmi_misses);
|
||||
|
||||
return nmi;
|
||||
}
|
||||
|
||||
/* Need to reset the NMI MMR register, but only once per hub. */
|
||||
static inline void uv_clear_nmi(int cpu)
|
||||
{
|
||||
struct uv_hub_nmi_s *hub_nmi = uv_hub_nmi;
|
||||
|
||||
if (cpu == atomic_read(&hub_nmi->cpu_owner)) {
|
||||
atomic_set(&hub_nmi->cpu_owner, -1);
|
||||
atomic_set(&hub_nmi->in_nmi, 0);
|
||||
uv_local_mmr_clear_nmi();
|
||||
raw_spin_unlock(&hub_nmi->nmi_lock);
|
||||
}
|
||||
}
|
||||
|
||||
/* Print non-responding cpus */
|
||||
static void uv_nmi_nr_cpus_pr(char *fmt)
|
||||
{
|
||||
static char cpu_list[1024];
|
||||
int len = sizeof(cpu_list);
|
||||
int c = cpumask_weight(uv_nmi_cpu_mask);
|
||||
int n = cpulist_scnprintf(cpu_list, len, uv_nmi_cpu_mask);
|
||||
|
||||
if (n >= len-1)
|
||||
strcpy(&cpu_list[len - 6], "...\n");
|
||||
|
||||
printk(fmt, c, cpu_list);
|
||||
}
|
||||
|
||||
/* Ping non-responding cpus attemping to force them into the NMI handler */
|
||||
static void uv_nmi_nr_cpus_ping(void)
|
||||
{
|
||||
int cpu;
|
||||
|
||||
for_each_cpu(cpu, uv_nmi_cpu_mask)
|
||||
atomic_set(&uv_cpu_nmi_per(cpu).pinging, 1);
|
||||
|
||||
apic->send_IPI_mask(uv_nmi_cpu_mask, APIC_DM_NMI);
|
||||
}
|
||||
|
||||
/* Clean up flags for cpus that ignored both NMI and ping */
|
||||
static void uv_nmi_cleanup_mask(void)
|
||||
{
|
||||
int cpu;
|
||||
|
||||
for_each_cpu(cpu, uv_nmi_cpu_mask) {
|
||||
atomic_set(&uv_cpu_nmi_per(cpu).pinging, 0);
|
||||
atomic_set(&uv_cpu_nmi_per(cpu).state, UV_NMI_STATE_OUT);
|
||||
cpumask_clear_cpu(cpu, uv_nmi_cpu_mask);
|
||||
}
|
||||
}
|
||||
|
||||
/* Loop waiting as cpus enter nmi handler */
|
||||
static int uv_nmi_wait_cpus(int first)
|
||||
{
|
||||
int i, j, k, n = num_online_cpus();
|
||||
int last_k = 0, waiting = 0;
|
||||
|
||||
if (first) {
|
||||
cpumask_copy(uv_nmi_cpu_mask, cpu_online_mask);
|
||||
k = 0;
|
||||
} else {
|
||||
k = n - cpumask_weight(uv_nmi_cpu_mask);
|
||||
}
|
||||
|
||||
udelay(uv_nmi_initial_delay);
|
||||
for (i = 0; i < uv_nmi_retry_count; i++) {
|
||||
int loop_delay = uv_nmi_loop_delay;
|
||||
|
||||
for_each_cpu(j, uv_nmi_cpu_mask) {
|
||||
if (atomic_read(&uv_cpu_nmi_per(j).state)) {
|
||||
cpumask_clear_cpu(j, uv_nmi_cpu_mask);
|
||||
if (++k >= n)
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (k >= n) { /* all in? */
|
||||
k = n;
|
||||
break;
|
||||
}
|
||||
if (last_k != k) { /* abort if no new cpus coming in */
|
||||
last_k = k;
|
||||
waiting = 0;
|
||||
} else if (++waiting > uv_nmi_wait_count)
|
||||
break;
|
||||
|
||||
/* extend delay if waiting only for cpu 0 */
|
||||
if (waiting && (n - k) == 1 &&
|
||||
cpumask_test_cpu(0, uv_nmi_cpu_mask))
|
||||
loop_delay *= 100;
|
||||
|
||||
udelay(loop_delay);
|
||||
}
|
||||
atomic_set(&uv_nmi_cpus_in_nmi, k);
|
||||
return n - k;
|
||||
}
|
||||
|
||||
/* Wait until all slave cpus have entered UV NMI handler */
|
||||
static void uv_nmi_wait(int master)
|
||||
{
|
||||
/* indicate this cpu is in */
|
||||
atomic_set(&uv_cpu_nmi.state, UV_NMI_STATE_IN);
|
||||
|
||||
/* if not the first cpu in (the master), then we are a slave cpu */
|
||||
if (!master)
|
||||
return;
|
||||
|
||||
do {
|
||||
/* wait for all other cpus to gather here */
|
||||
if (!uv_nmi_wait_cpus(1))
|
||||
break;
|
||||
|
||||
/* if not all made it in, send IPI NMI to them */
|
||||
uv_nmi_nr_cpus_pr(KERN_ALERT
|
||||
"UV: Sending NMI IPI to %d non-responding CPUs: %s\n");
|
||||
uv_nmi_nr_cpus_ping();
|
||||
|
||||
/* if all cpus are in, then done */
|
||||
if (!uv_nmi_wait_cpus(0))
|
||||
break;
|
||||
|
||||
uv_nmi_nr_cpus_pr(KERN_ALERT
|
||||
"UV: %d CPUs not in NMI loop: %s\n");
|
||||
} while (0);
|
||||
|
||||
pr_alert("UV: %d of %d CPUs in NMI\n",
|
||||
atomic_read(&uv_nmi_cpus_in_nmi), num_online_cpus());
|
||||
}
|
||||
|
||||
static void uv_nmi_dump_cpu_ip_hdr(void)
|
||||
{
|
||||
printk(KERN_DEFAULT
|
||||
"\nUV: %4s %6s %-32s %s (Note: PID 0 not listed)\n",
|
||||
"CPU", "PID", "COMMAND", "IP");
|
||||
}
|
||||
|
||||
static void uv_nmi_dump_cpu_ip(int cpu, struct pt_regs *regs)
|
||||
{
|
||||
printk(KERN_DEFAULT "UV: %4d %6d %-32.32s ",
|
||||
cpu, current->pid, current->comm);
|
||||
|
||||
printk_address(regs->ip, 1);
|
||||
}
|
||||
|
||||
/* Dump this cpu's state */
|
||||
static void uv_nmi_dump_state_cpu(int cpu, struct pt_regs *regs)
|
||||
{
|
||||
const char *dots = " ................................. ";
|
||||
|
||||
if (uv_nmi_action_is("ips")) {
|
||||
if (cpu == 0)
|
||||
uv_nmi_dump_cpu_ip_hdr();
|
||||
|
||||
if (current->pid != 0)
|
||||
uv_nmi_dump_cpu_ip(cpu, regs);
|
||||
|
||||
} else if (uv_nmi_action_is("dump")) {
|
||||
printk(KERN_DEFAULT
|
||||
"UV:%sNMI process trace for CPU %d\n", dots, cpu);
|
||||
show_regs(regs);
|
||||
}
|
||||
atomic_set(&uv_cpu_nmi.state, UV_NMI_STATE_DUMP_DONE);
|
||||
}
|
||||
|
||||
/* Trigger a slave cpu to dump it's state */
|
||||
static void uv_nmi_trigger_dump(int cpu)
|
||||
{
|
||||
int retry = uv_nmi_trigger_delay;
|
||||
|
||||
if (atomic_read(&uv_cpu_nmi_per(cpu).state) != UV_NMI_STATE_IN)
|
||||
return;
|
||||
|
||||
atomic_set(&uv_cpu_nmi_per(cpu).state, UV_NMI_STATE_DUMP);
|
||||
do {
|
||||
cpu_relax();
|
||||
udelay(10);
|
||||
if (atomic_read(&uv_cpu_nmi_per(cpu).state)
|
||||
!= UV_NMI_STATE_DUMP)
|
||||
return;
|
||||
} while (--retry > 0);
|
||||
|
||||
pr_crit("UV: CPU %d stuck in process dump function\n", cpu);
|
||||
atomic_set(&uv_cpu_nmi_per(cpu).state, UV_NMI_STATE_DUMP_DONE);
|
||||
}
|
||||
|
||||
/* Wait until all cpus ready to exit */
|
||||
static void uv_nmi_sync_exit(int master)
|
||||
{
|
||||
atomic_dec(&uv_nmi_cpus_in_nmi);
|
||||
if (master) {
|
||||
while (atomic_read(&uv_nmi_cpus_in_nmi) > 0)
|
||||
cpu_relax();
|
||||
atomic_set(&uv_nmi_slave_continue, SLAVE_CLEAR);
|
||||
} else {
|
||||
while (atomic_read(&uv_nmi_slave_continue))
|
||||
cpu_relax();
|
||||
}
|
||||
}
|
||||
|
||||
/* Walk through cpu list and dump state of each */
|
||||
static void uv_nmi_dump_state(int cpu, struct pt_regs *regs, int master)
|
||||
{
|
||||
if (master) {
|
||||
int tcpu;
|
||||
int ignored = 0;
|
||||
int saved_console_loglevel = console_loglevel;
|
||||
|
||||
pr_alert("UV: tracing %s for %d CPUs from CPU %d\n",
|
||||
uv_nmi_action_is("ips") ? "IPs" : "processes",
|
||||
atomic_read(&uv_nmi_cpus_in_nmi), cpu);
|
||||
|
||||
console_loglevel = uv_nmi_loglevel;
|
||||
atomic_set(&uv_nmi_slave_continue, SLAVE_EXIT);
|
||||
for_each_online_cpu(tcpu) {
|
||||
if (cpumask_test_cpu(tcpu, uv_nmi_cpu_mask))
|
||||
ignored++;
|
||||
else if (tcpu == cpu)
|
||||
uv_nmi_dump_state_cpu(tcpu, regs);
|
||||
else
|
||||
uv_nmi_trigger_dump(tcpu);
|
||||
}
|
||||
if (ignored)
|
||||
printk(KERN_DEFAULT "UV: %d CPUs ignored NMI\n",
|
||||
ignored);
|
||||
|
||||
console_loglevel = saved_console_loglevel;
|
||||
pr_alert("UV: process trace complete\n");
|
||||
} else {
|
||||
while (!atomic_read(&uv_nmi_slave_continue))
|
||||
cpu_relax();
|
||||
while (atomic_read(&uv_cpu_nmi.state) != UV_NMI_STATE_DUMP)
|
||||
cpu_relax();
|
||||
uv_nmi_dump_state_cpu(cpu, regs);
|
||||
}
|
||||
uv_nmi_sync_exit(master);
|
||||
}
|
||||
|
||||
static void uv_nmi_touch_watchdogs(void)
|
||||
{
|
||||
touch_softlockup_watchdog_sync();
|
||||
clocksource_touch_watchdog();
|
||||
rcu_cpu_stall_reset();
|
||||
touch_nmi_watchdog();
|
||||
}
|
||||
|
||||
#if defined(CONFIG_KEXEC)
|
||||
static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
|
||||
{
|
||||
/* Call crash to dump system state */
|
||||
if (master) {
|
||||
pr_emerg("UV: NMI executing crash_kexec on CPU%d\n", cpu);
|
||||
crash_kexec(regs);
|
||||
|
||||
pr_emerg("UV: crash_kexec unexpectedly returned, ");
|
||||
if (!kexec_crash_image) {
|
||||
pr_cont("crash kernel not loaded\n");
|
||||
atomic_set(&uv_nmi_kexec_failed, 1);
|
||||
uv_nmi_sync_exit(1);
|
||||
return;
|
||||
}
|
||||
pr_cont("kexec busy, stalling cpus while waiting\n");
|
||||
}
|
||||
|
||||
/* If crash exec fails the slaves should return, otherwise stall */
|
||||
while (atomic_read(&uv_nmi_kexec_failed) == 0)
|
||||
mdelay(10);
|
||||
|
||||
/* Crash kernel most likely not loaded, return in an orderly fashion */
|
||||
uv_nmi_sync_exit(0);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_KEXEC */
|
||||
static inline void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
|
||||
{
|
||||
if (master)
|
||||
pr_err("UV: NMI kdump: KEXEC not supported in this kernel\n");
|
||||
}
|
||||
#endif /* !CONFIG_KEXEC */
|
||||
|
||||
#ifdef CONFIG_KGDB_KDB
|
||||
/* Call KDB from NMI handler */
|
||||
static void uv_call_kdb(int cpu, struct pt_regs *regs, int master)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (master) {
|
||||
/* call KGDB NMI handler as MASTER */
|
||||
ret = kgdb_nmicallin(cpu, X86_TRAP_NMI, regs,
|
||||
&uv_nmi_slave_continue);
|
||||
if (ret) {
|
||||
pr_alert("KDB returned error, is kgdboc set?\n");
|
||||
atomic_set(&uv_nmi_slave_continue, SLAVE_EXIT);
|
||||
}
|
||||
} else {
|
||||
/* wait for KGDB signal that it's ready for slaves to enter */
|
||||
int sig;
|
||||
|
||||
do {
|
||||
cpu_relax();
|
||||
sig = atomic_read(&uv_nmi_slave_continue);
|
||||
} while (!sig);
|
||||
|
||||
/* call KGDB as slave */
|
||||
if (sig == SLAVE_CONTINUE)
|
||||
kgdb_nmicallback(cpu, regs);
|
||||
}
|
||||
uv_nmi_sync_exit(master);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_KGDB_KDB */
|
||||
static inline void uv_call_kdb(int cpu, struct pt_regs *regs, int master)
|
||||
{
|
||||
pr_err("UV: NMI error: KGDB/KDB is not enabled in this kernel\n");
|
||||
}
|
||||
#endif /* !CONFIG_KGDB_KDB */
|
||||
|
||||
/*
|
||||
* UV NMI handler
|
||||
*/
|
||||
int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
|
||||
{
|
||||
struct uv_hub_nmi_s *hub_nmi = uv_hub_nmi;
|
||||
int cpu = smp_processor_id();
|
||||
int master = 0;
|
||||
unsigned long flags;
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
/* If not a UV System NMI, ignore */
|
||||
if (!atomic_read(&uv_cpu_nmi.pinging) && !uv_check_nmi(hub_nmi)) {
|
||||
local_irq_restore(flags);
|
||||
return NMI_DONE;
|
||||
}
|
||||
|
||||
/* Indicate we are the first CPU into the NMI handler */
|
||||
master = (atomic_read(&uv_nmi_cpu) == cpu);
|
||||
|
||||
/* If NMI action is "kdump", then attempt to do it */
|
||||
if (uv_nmi_action_is("kdump"))
|
||||
uv_nmi_kdump(cpu, master, regs);
|
||||
|
||||
/* Pause as all cpus enter the NMI handler */
|
||||
uv_nmi_wait(master);
|
||||
|
||||
/* Dump state of each cpu */
|
||||
if (uv_nmi_action_is("ips") || uv_nmi_action_is("dump"))
|
||||
uv_nmi_dump_state(cpu, regs, master);
|
||||
|
||||
/* Call KDB if enabled */
|
||||
else if (uv_nmi_action_is("kdb"))
|
||||
uv_call_kdb(cpu, regs, master);
|
||||
|
||||
/* Clear per_cpu "in nmi" flag */
|
||||
atomic_set(&uv_cpu_nmi.state, UV_NMI_STATE_OUT);
|
||||
|
||||
/* Clear MMR NMI flag on each hub */
|
||||
uv_clear_nmi(cpu);
|
||||
|
||||
/* Clear global flags */
|
||||
if (master) {
|
||||
if (cpumask_weight(uv_nmi_cpu_mask))
|
||||
uv_nmi_cleanup_mask();
|
||||
atomic_set(&uv_nmi_cpus_in_nmi, -1);
|
||||
atomic_set(&uv_nmi_cpu, -1);
|
||||
atomic_set(&uv_in_nmi, 0);
|
||||
}
|
||||
|
||||
uv_nmi_touch_watchdogs();
|
||||
local_irq_restore(flags);
|
||||
|
||||
return NMI_HANDLED;
|
||||
}
|
||||
|
||||
/*
|
||||
* NMI handler for pulling in CPUs when perf events are grabbing our NMI
|
||||
*/
|
||||
int uv_handle_nmi_ping(unsigned int reason, struct pt_regs *regs)
|
||||
{
|
||||
int ret;
|
||||
|
||||
uv_cpu_nmi.queries++;
|
||||
if (!atomic_read(&uv_cpu_nmi.pinging)) {
|
||||
local64_inc(&uv_nmi_ping_misses);
|
||||
return NMI_DONE;
|
||||
}
|
||||
|
||||
uv_cpu_nmi.pings++;
|
||||
local64_inc(&uv_nmi_ping_count);
|
||||
ret = uv_handle_nmi(reason, regs);
|
||||
atomic_set(&uv_cpu_nmi.pinging, 0);
|
||||
return ret;
|
||||
}
|
||||
|
||||
void uv_register_nmi_notifier(void)
|
||||
{
|
||||
if (register_nmi_handler(NMI_UNKNOWN, uv_handle_nmi, 0, "uv"))
|
||||
pr_warn("UV: NMI handler failed to register\n");
|
||||
|
||||
if (register_nmi_handler(NMI_LOCAL, uv_handle_nmi_ping, 0, "uvping"))
|
||||
pr_warn("UV: PING NMI handler failed to register\n");
|
||||
}
|
||||
|
||||
void uv_nmi_init(void)
|
||||
{
|
||||
unsigned int value;
|
||||
|
||||
/*
|
||||
* Unmask NMI on all cpus
|
||||
*/
|
||||
value = apic_read(APIC_LVT1) | APIC_DM_NMI;
|
||||
value &= ~APIC_LVT_MASKED;
|
||||
apic_write(APIC_LVT1, value);
|
||||
}
|
||||
|
||||
void uv_nmi_setup(void)
|
||||
{
|
||||
int size = sizeof(void *) * (1 << NODES_SHIFT);
|
||||
int cpu, nid;
|
||||
|
||||
/* Setup hub nmi info */
|
||||
uv_nmi_setup_mmrs();
|
||||
uv_hub_nmi_list = kzalloc(size, GFP_KERNEL);
|
||||
pr_info("UV: NMI hub list @ 0x%p (%d)\n", uv_hub_nmi_list, size);
|
||||
BUG_ON(!uv_hub_nmi_list);
|
||||
size = sizeof(struct uv_hub_nmi_s);
|
||||
for_each_present_cpu(cpu) {
|
||||
nid = cpu_to_node(cpu);
|
||||
if (uv_hub_nmi_list[nid] == NULL) {
|
||||
uv_hub_nmi_list[nid] = kzalloc_node(size,
|
||||
GFP_KERNEL, nid);
|
||||
BUG_ON(!uv_hub_nmi_list[nid]);
|
||||
raw_spin_lock_init(&(uv_hub_nmi_list[nid]->nmi_lock));
|
||||
atomic_set(&uv_hub_nmi_list[nid]->cpu_owner, -1);
|
||||
}
|
||||
uv_hub_nmi_per(cpu) = uv_hub_nmi_list[nid];
|
||||
}
|
||||
BUG_ON(!alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL));
|
||||
}
|
||||
|
||||
|
||||
@ -109,6 +109,7 @@ typedef enum {
|
||||
KDB_REASON_RECURSE, /* Recursive entry to kdb;
|
||||
* regs probably valid */
|
||||
KDB_REASON_SSTEP, /* Single Step trap. - regs valid */
|
||||
KDB_REASON_SYSTEM_NMI, /* In NMI due to SYSTEM cmd; regs valid */
|
||||
} kdb_reason_t;
|
||||
|
||||
extern int kdb_trap_printk;
|
||||
|
||||
@ -310,6 +310,7 @@ extern int
|
||||
kgdb_handle_exception(int ex_vector, int signo, int err_code,
|
||||
struct pt_regs *regs);
|
||||
extern int kgdb_nmicallback(int cpu, void *regs);
|
||||
extern int kgdb_nmicallin(int cpu, int trapnr, void *regs, atomic_t *snd_rdy);
|
||||
extern void gdbstub_exit(int status);
|
||||
|
||||
extern int kgdb_single_step;
|
||||
|
||||
@ -575,8 +575,12 @@ static int kgdb_cpu_enter(struct kgdb_state *ks, struct pt_regs *regs,
|
||||
raw_spin_lock(&dbg_slave_lock);
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
/* If send_ready set, slaves are already waiting */
|
||||
if (ks->send_ready)
|
||||
atomic_set(ks->send_ready, 1);
|
||||
|
||||
/* Signal the other CPUs to enter kgdb_wait() */
|
||||
if ((!kgdb_single_step) && kgdb_do_roundup)
|
||||
else if ((!kgdb_single_step) && kgdb_do_roundup)
|
||||
kgdb_roundup_cpus(flags);
|
||||
#endif
|
||||
|
||||
@ -678,11 +682,11 @@ kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
|
||||
if (arch_kgdb_ops.enable_nmi)
|
||||
arch_kgdb_ops.enable_nmi(0);
|
||||
|
||||
memset(ks, 0, sizeof(struct kgdb_state));
|
||||
ks->cpu = raw_smp_processor_id();
|
||||
ks->ex_vector = evector;
|
||||
ks->signo = signo;
|
||||
ks->err_code = ecode;
|
||||
ks->kgdb_usethreadid = 0;
|
||||
ks->linux_regs = regs;
|
||||
|
||||
if (kgdb_reenter_check(ks))
|
||||
@ -732,6 +736,30 @@ int kgdb_nmicallback(int cpu, void *regs)
|
||||
return 1;
|
||||
}
|
||||
|
||||
int kgdb_nmicallin(int cpu, int trapnr, void *regs, atomic_t *send_ready)
|
||||
{
|
||||
#ifdef CONFIG_SMP
|
||||
if (!kgdb_io_ready(0) || !send_ready)
|
||||
return 1;
|
||||
|
||||
if (kgdb_info[cpu].enter_kgdb == 0) {
|
||||
struct kgdb_state kgdb_var;
|
||||
struct kgdb_state *ks = &kgdb_var;
|
||||
|
||||
memset(ks, 0, sizeof(struct kgdb_state));
|
||||
ks->cpu = cpu;
|
||||
ks->ex_vector = trapnr;
|
||||
ks->signo = SIGTRAP;
|
||||
ks->err_code = KGDB_KDB_REASON_SYSTEM_NMI;
|
||||
ks->linux_regs = regs;
|
||||
ks->send_ready = send_ready;
|
||||
kgdb_cpu_enter(ks, regs, DCPU_WANT_MASTER);
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void kgdb_console_write(struct console *co, const char *s,
|
||||
unsigned count)
|
||||
{
|
||||
|
||||
@ -26,6 +26,7 @@ struct kgdb_state {
|
||||
unsigned long threadid;
|
||||
long kgdb_usethreadid;
|
||||
struct pt_regs *linux_regs;
|
||||
atomic_t *send_ready;
|
||||
};
|
||||
|
||||
/* Exception state values */
|
||||
@ -74,11 +75,13 @@ extern int kdb_stub(struct kgdb_state *ks);
|
||||
extern int kdb_parse(const char *cmdstr);
|
||||
extern int kdb_common_init_state(struct kgdb_state *ks);
|
||||
extern int kdb_common_deinit_state(void);
|
||||
#define KGDB_KDB_REASON_SYSTEM_NMI KDB_REASON_SYSTEM_NMI
|
||||
#else /* ! CONFIG_KGDB_KDB */
|
||||
static inline int kdb_stub(struct kgdb_state *ks)
|
||||
{
|
||||
return DBG_PASS_EVENT;
|
||||
}
|
||||
#define KGDB_KDB_REASON_SYSTEM_NMI 0
|
||||
#endif /* CONFIG_KGDB_KDB */
|
||||
|
||||
#endif /* _DEBUG_CORE_H_ */
|
||||
|
||||
@ -69,7 +69,10 @@ int kdb_stub(struct kgdb_state *ks)
|
||||
if (atomic_read(&kgdb_setting_breakpoint))
|
||||
reason = KDB_REASON_KEYBOARD;
|
||||
|
||||
if (in_nmi())
|
||||
if (ks->err_code == KDB_REASON_SYSTEM_NMI && ks->signo == SIGTRAP)
|
||||
reason = KDB_REASON_SYSTEM_NMI;
|
||||
|
||||
else if (in_nmi())
|
||||
reason = KDB_REASON_NMI;
|
||||
|
||||
for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
|
||||
|
||||
@ -1200,6 +1200,9 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
|
||||
instruction_pointer(regs));
|
||||
kdb_dumpregs(regs);
|
||||
break;
|
||||
case KDB_REASON_SYSTEM_NMI:
|
||||
kdb_printf("due to System NonMaskable Interrupt\n");
|
||||
break;
|
||||
case KDB_REASON_NMI:
|
||||
kdb_printf("due to NonMaskable Interrupt @ "
|
||||
kdb_machreg_fmt "\n",
|
||||
|
||||
Loading…
Reference in New Issue
Block a user