sparc64: Add global PMU register dumping via sysrq.
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
08280e6c4c
commit
916ca14aaf
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@ -116,6 +116,7 @@ On all - write a character to /proc/sysrq-trigger. e.g.:
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'w' - Dumps tasks that are in uninterruptable (blocked) state.
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'x' - Used by xmon interface on ppc/powerpc platforms.
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Show global PMU Registers on sparc64.
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'y' - Show global CPU Registers [SPARC-64 specific]
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@ -42,7 +42,18 @@ struct global_reg_snapshot {
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struct thread_info *thread;
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unsigned long pad1;
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};
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extern struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
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struct global_pmu_snapshot {
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unsigned long pcr[4];
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unsigned long pic[4];
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};
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union global_cpu_snapshot {
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struct global_reg_snapshot reg;
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struct global_pmu_snapshot pmu;
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};
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extern union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
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#define force_successful_syscall_return() \
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do { current_thread_info()->syscall_noerror = 1; \
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@ -48,6 +48,7 @@ extern void smp_fill_in_sib_core_maps(void);
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extern void cpu_play_dead(void);
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extern void smp_fetch_global_regs(void);
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extern void smp_fetch_global_pmu(void);
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struct seq_file;
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void smp_bogo(struct seq_file *);
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@ -65,6 +66,7 @@ extern void __cpu_die(unsigned int cpu);
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#define hard_smp_processor_id() 0
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#define smp_fill_in_sib_core_maps() do { } while (0)
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#define smp_fetch_global_regs() do { } while (0)
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#define smp_fetch_global_pmu() do { } while (0)
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#endif /* !(CONFIG_SMP) */
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@ -27,6 +27,7 @@
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#include <linux/tick.h>
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#include <linux/init.h>
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#include <linux/cpu.h>
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#include <linux/perf_event.h>
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#include <linux/elfcore.h>
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#include <linux/sysrq.h>
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#include <linux/nmi.h>
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@ -47,6 +48,7 @@
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#include <asm/syscalls.h>
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#include <asm/irq_regs.h>
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#include <asm/smp.h>
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#include <asm/pcr.h>
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#include "kstack.h"
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@ -204,18 +206,22 @@ void show_regs(struct pt_regs *regs)
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show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
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}
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struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
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static DEFINE_SPINLOCK(global_reg_snapshot_lock);
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union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
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static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
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static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
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int this_cpu)
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{
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struct global_reg_snapshot *rp;
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flushw_all();
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global_reg_snapshot[this_cpu].tstate = regs->tstate;
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global_reg_snapshot[this_cpu].tpc = regs->tpc;
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global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
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global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
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rp = &global_cpu_snapshot[this_cpu].reg;
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rp->tstate = regs->tstate;
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rp->tpc = regs->tpc;
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rp->tnpc = regs->tnpc;
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rp->o7 = regs->u_regs[UREG_I7];
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if (regs->tstate & TSTATE_PRIV) {
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struct reg_window *rw;
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@ -223,17 +229,17 @@ static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
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rw = (struct reg_window *)
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(regs->u_regs[UREG_FP] + STACK_BIAS);
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if (kstack_valid(tp, (unsigned long) rw)) {
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global_reg_snapshot[this_cpu].i7 = rw->ins[7];
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rp->i7 = rw->ins[7];
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rw = (struct reg_window *)
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(rw->ins[6] + STACK_BIAS);
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if (kstack_valid(tp, (unsigned long) rw))
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global_reg_snapshot[this_cpu].rpc = rw->ins[7];
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rp->rpc = rw->ins[7];
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}
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} else {
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global_reg_snapshot[this_cpu].i7 = 0;
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global_reg_snapshot[this_cpu].rpc = 0;
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rp->i7 = 0;
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rp->rpc = 0;
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}
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global_reg_snapshot[this_cpu].thread = tp;
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rp->thread = tp;
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}
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/* In order to avoid hangs we do not try to synchronize with the
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@ -261,9 +267,9 @@ void arch_trigger_all_cpu_backtrace(void)
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if (!regs)
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regs = tp->kregs;
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spin_lock_irqsave(&global_reg_snapshot_lock, flags);
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spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
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memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
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this_cpu = raw_smp_processor_id();
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@ -272,7 +278,7 @@ void arch_trigger_all_cpu_backtrace(void)
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smp_fetch_global_regs();
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for_each_online_cpu(cpu) {
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struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
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struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
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__global_reg_poll(gp);
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@ -295,9 +301,9 @@ void arch_trigger_all_cpu_backtrace(void)
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}
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}
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memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
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spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
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spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
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}
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#ifdef CONFIG_MAGIC_SYSRQ
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@ -309,16 +315,90 @@ static void sysrq_handle_globreg(int key)
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static struct sysrq_key_op sparc_globalreg_op = {
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.handler = sysrq_handle_globreg,
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.help_msg = "Globalregs",
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.help_msg = "global-regs(Y)",
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.action_msg = "Show Global CPU Regs",
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};
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static int __init sparc_globreg_init(void)
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static void __global_pmu_self(int this_cpu)
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{
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return register_sysrq_key('y', &sparc_globalreg_op);
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struct global_pmu_snapshot *pp;
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int i, num;
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pp = &global_cpu_snapshot[this_cpu].pmu;
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num = 1;
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if (tlb_type == hypervisor &&
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sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
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num = 4;
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for (i = 0; i < num; i++) {
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pp->pcr[i] = pcr_ops->read_pcr(i);
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pp->pic[i] = pcr_ops->read_pic(i);
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}
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}
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core_initcall(sparc_globreg_init);
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static void __global_pmu_poll(struct global_pmu_snapshot *pp)
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{
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int limit = 0;
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while (!pp->pcr[0] && ++limit < 100) {
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barrier();
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udelay(1);
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}
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}
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static void pmu_snapshot_all_cpus(void)
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{
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unsigned long flags;
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int this_cpu, cpu;
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spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
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this_cpu = raw_smp_processor_id();
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__global_pmu_self(this_cpu);
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smp_fetch_global_pmu();
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for_each_online_cpu(cpu) {
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struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
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__global_pmu_poll(pp);
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printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
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(cpu == this_cpu ? '*' : ' '), cpu,
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pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
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pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
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}
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
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spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
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}
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static void sysrq_handle_globpmu(int key)
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{
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pmu_snapshot_all_cpus();
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}
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static struct sysrq_key_op sparc_globalpmu_op = {
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.handler = sysrq_handle_globpmu,
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.help_msg = "global-pmu(X)",
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.action_msg = "Show Global PMU Regs",
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};
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static int __init sparc_sysrq_init(void)
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{
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int ret = register_sysrq_key('y', &sparc_globalreg_op);
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if (!ret)
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ret = register_sysrq_key('x', &sparc_globalpmu_op);
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return ret;
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}
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core_initcall(sparc_sysrq_init);
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#endif
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@ -852,6 +852,8 @@ extern unsigned long xcall_flush_tlb_mm;
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extern unsigned long xcall_flush_tlb_pending;
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extern unsigned long xcall_flush_tlb_kernel_range;
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extern unsigned long xcall_fetch_glob_regs;
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extern unsigned long xcall_fetch_glob_pmu;
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extern unsigned long xcall_fetch_glob_pmu_n4;
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extern unsigned long xcall_receive_signal;
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extern unsigned long xcall_new_mmu_context_version;
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#ifdef CONFIG_KGDB
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@ -1000,6 +1002,15 @@ void smp_fetch_global_regs(void)
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smp_cross_call(&xcall_fetch_glob_regs, 0, 0, 0);
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}
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void smp_fetch_global_pmu(void)
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{
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if (tlb_type == hypervisor &&
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sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
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smp_cross_call(&xcall_fetch_glob_pmu_n4, 0, 0, 0);
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else
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smp_cross_call(&xcall_fetch_glob_pmu, 0, 0, 0);
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}
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/* We know that the window frames of the user have been flushed
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* to the stack before we get here because all callers of us
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* are flush_tlb_*() routines, and these run after flush_cache_*()
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@ -481,8 +481,8 @@ xcall_sync_tick:
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.globl xcall_fetch_glob_regs
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xcall_fetch_glob_regs:
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sethi %hi(global_reg_snapshot), %g1
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or %g1, %lo(global_reg_snapshot), %g1
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sethi %hi(global_cpu_snapshot), %g1
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or %g1, %lo(global_cpu_snapshot), %g1
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__GET_CPUID(%g2)
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sllx %g2, 6, %g3
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add %g1, %g3, %g1
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@ -509,6 +509,66 @@ xcall_fetch_glob_regs:
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stx %g3, [%g1 + GR_SNAP_THREAD]
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retry
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.globl xcall_fetch_glob_pmu
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xcall_fetch_glob_pmu:
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sethi %hi(global_cpu_snapshot), %g1
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or %g1, %lo(global_cpu_snapshot), %g1
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__GET_CPUID(%g2)
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sllx %g2, 6, %g3
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add %g1, %g3, %g1
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rd %pic, %g7
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stx %g7, [%g1 + (4 * 8)]
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rd %pcr, %g7
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stx %g7, [%g1 + (0 * 8)]
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retry
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.globl xcall_fetch_glob_pmu_n4
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xcall_fetch_glob_pmu_n4:
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sethi %hi(global_cpu_snapshot), %g1
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or %g1, %lo(global_cpu_snapshot), %g1
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__GET_CPUID(%g2)
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sllx %g2, 6, %g3
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add %g1, %g3, %g1
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ldxa [%g0] ASI_PIC, %g7
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stx %g7, [%g1 + (4 * 8)]
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mov 0x08, %g3
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ldxa [%g3] ASI_PIC, %g7
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stx %g7, [%g1 + (5 * 8)]
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mov 0x10, %g3
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ldxa [%g3] ASI_PIC, %g7
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stx %g7, [%g1 + (6 * 8)]
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mov 0x18, %g3
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ldxa [%g3] ASI_PIC, %g7
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stx %g7, [%g1 + (7 * 8)]
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mov %o0, %g2
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mov %o1, %g3
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mov %o5, %g7
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mov HV_FAST_VT_GET_PERFREG, %o5
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mov 3, %o0
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ta HV_FAST_TRAP
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stx %o1, [%g1 + (3 * 8)]
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mov HV_FAST_VT_GET_PERFREG, %o5
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mov 2, %o0
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ta HV_FAST_TRAP
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stx %o1, [%g1 + (2 * 8)]
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mov HV_FAST_VT_GET_PERFREG, %o5
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mov 1, %o0
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ta HV_FAST_TRAP
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stx %o1, [%g1 + (1 * 8)]
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mov HV_FAST_VT_GET_PERFREG, %o5
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mov 0, %o0
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ta HV_FAST_TRAP
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stx %o1, [%g1 + (0 * 8)]
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mov %g2, %o0
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mov %g3, %o1
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mov %g7, %o5
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retry
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#ifdef DCACHE_ALIASING_POSSIBLE
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.align 32
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.globl xcall_flush_dcache_page_cheetah
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@ -452,6 +452,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
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NULL, /* v */
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&sysrq_showstate_blocked_op, /* w */
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/* x: May be registered on ppc/powerpc for xmon */
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/* x: May be registered on sparc64 for global PMU dump */
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NULL, /* x */
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/* y: May be registered on sparc64 for global register dump */
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NULL, /* y */
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