Commit 916ca14a authored by David S. Miller's avatar David S. Miller

sparc64: Add global PMU register dumping via sysrq.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 08280e6c
......@@ -116,6 +116,7 @@ On all - write a character to /proc/sysrq-trigger. e.g.:
'w' - Dumps tasks that are in uninterruptable (blocked) state.
'x' - Used by xmon interface on ppc/powerpc platforms.
Show global PMU Registers on sparc64.
'y' - Show global CPU Registers [SPARC-64 specific]
......
......@@ -42,7 +42,18 @@ struct global_reg_snapshot {
struct thread_info *thread;
unsigned long pad1;
};
extern struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
struct global_pmu_snapshot {
unsigned long pcr[4];
unsigned long pic[4];
};
union global_cpu_snapshot {
struct global_reg_snapshot reg;
struct global_pmu_snapshot pmu;
};
extern union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
#define force_successful_syscall_return() \
do { current_thread_info()->syscall_noerror = 1; \
......
......@@ -48,6 +48,7 @@ extern void smp_fill_in_sib_core_maps(void);
extern void cpu_play_dead(void);
extern void smp_fetch_global_regs(void);
extern void smp_fetch_global_pmu(void);
struct seq_file;
void smp_bogo(struct seq_file *);
......@@ -65,6 +66,7 @@ extern void __cpu_die(unsigned int cpu);
#define hard_smp_processor_id() 0
#define smp_fill_in_sib_core_maps() do { } while (0)
#define smp_fetch_global_regs() do { } while (0)
#define smp_fetch_global_pmu() do { } while (0)
#endif /* !(CONFIG_SMP) */
......
......@@ -27,6 +27,7 @@
#include <linux/tick.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <linux/perf_event.h>
#include <linux/elfcore.h>
#include <linux/sysrq.h>
#include <linux/nmi.h>
......@@ -47,6 +48,7 @@
#include <asm/syscalls.h>
#include <asm/irq_regs.h>
#include <asm/smp.h>
#include <asm/pcr.h>
#include "kstack.h"
......@@ -204,18 +206,22 @@ void show_regs(struct pt_regs *regs)
show_stack(current, (unsigned long *) regs->u_regs[UREG_FP]);
}
struct global_reg_snapshot global_reg_snapshot[NR_CPUS];
static DEFINE_SPINLOCK(global_reg_snapshot_lock);
union global_cpu_snapshot global_cpu_snapshot[NR_CPUS];
static DEFINE_SPINLOCK(global_cpu_snapshot_lock);
static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
int this_cpu)
{
struct global_reg_snapshot *rp;
flushw_all();
global_reg_snapshot[this_cpu].tstate = regs->tstate;
global_reg_snapshot[this_cpu].tpc = regs->tpc;
global_reg_snapshot[this_cpu].tnpc = regs->tnpc;
global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7];
rp = &global_cpu_snapshot[this_cpu].reg;
rp->tstate = regs->tstate;
rp->tpc = regs->tpc;
rp->tnpc = regs->tnpc;
rp->o7 = regs->u_regs[UREG_I7];
if (regs->tstate & TSTATE_PRIV) {
struct reg_window *rw;
......@@ -223,17 +229,17 @@ static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs,
rw = (struct reg_window *)
(regs->u_regs[UREG_FP] + STACK_BIAS);
if (kstack_valid(tp, (unsigned long) rw)) {
global_reg_snapshot[this_cpu].i7 = rw->ins[7];
rp->i7 = rw->ins[7];
rw = (struct reg_window *)
(rw->ins[6] + STACK_BIAS);
if (kstack_valid(tp, (unsigned long) rw))
global_reg_snapshot[this_cpu].rpc = rw->ins[7];
rp->rpc = rw->ins[7];
}
} else {
global_reg_snapshot[this_cpu].i7 = 0;
global_reg_snapshot[this_cpu].rpc = 0;
rp->i7 = 0;
rp->rpc = 0;
}
global_reg_snapshot[this_cpu].thread = tp;
rp->thread = tp;
}
/* In order to avoid hangs we do not try to synchronize with the
......@@ -261,9 +267,9 @@ void arch_trigger_all_cpu_backtrace(void)
if (!regs)
regs = tp->kregs;
spin_lock_irqsave(&global_reg_snapshot_lock, flags);
spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
this_cpu = raw_smp_processor_id();
......@@ -272,7 +278,7 @@ void arch_trigger_all_cpu_backtrace(void)
smp_fetch_global_regs();
for_each_online_cpu(cpu) {
struct global_reg_snapshot *gp = &global_reg_snapshot[cpu];
struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
__global_reg_poll(gp);
......@@ -295,9 +301,9 @@ void arch_trigger_all_cpu_backtrace(void)
}
}
memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot));
memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
spin_unlock_irqrestore(&global_reg_snapshot_lock, flags);
spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
}
#ifdef CONFIG_MAGIC_SYSRQ
......@@ -309,16 +315,90 @@ static void sysrq_handle_globreg(int key)
static struct sysrq_key_op sparc_globalreg_op = {
.handler = sysrq_handle_globreg,
.help_msg = "Globalregs",
.help_msg = "global-regs(Y)",
.action_msg = "Show Global CPU Regs",
};
static int __init sparc_globreg_init(void)
static void __global_pmu_self(int this_cpu)
{
struct global_pmu_snapshot *pp;
int i, num;
pp = &global_cpu_snapshot[this_cpu].pmu;
num = 1;
if (tlb_type == hypervisor &&
sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
num = 4;
for (i = 0; i < num; i++) {
pp->pcr[i] = pcr_ops->read_pcr(i);
pp->pic[i] = pcr_ops->read_pic(i);
}
}
static void __global_pmu_poll(struct global_pmu_snapshot *pp)
{
int limit = 0;
while (!pp->pcr[0] && ++limit < 100) {
barrier();
udelay(1);
}
}
static void pmu_snapshot_all_cpus(void)
{
return register_sysrq_key('y', &sparc_globalreg_op);
unsigned long flags;
int this_cpu, cpu;
spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
this_cpu = raw_smp_processor_id();
__global_pmu_self(this_cpu);
smp_fetch_global_pmu();
for_each_online_cpu(cpu) {
struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu;
__global_pmu_poll(pp);
printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n",
(cpu == this_cpu ? '*' : ' '), cpu,
pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3],
pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]);
}
memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags);
}
static void sysrq_handle_globpmu(int key)
{
pmu_snapshot_all_cpus();
}
static struct sysrq_key_op sparc_globalpmu_op = {
.handler = sysrq_handle_globpmu,
.help_msg = "global-pmu(X)",
.action_msg = "Show Global PMU Regs",
};
static int __init sparc_sysrq_init(void)
{
int ret = register_sysrq_key('y', &sparc_globalreg_op);
if (!ret)
ret = register_sysrq_key('x', &sparc_globalpmu_op);
return ret;
}
core_initcall(sparc_globreg_init);
core_initcall(sparc_sysrq_init);
#endif
......
......@@ -852,6 +852,8 @@ extern unsigned long xcall_flush_tlb_mm;
extern unsigned long xcall_flush_tlb_pending;
extern unsigned long xcall_flush_tlb_kernel_range;
extern unsigned long xcall_fetch_glob_regs;
extern unsigned long xcall_fetch_glob_pmu;
extern unsigned long xcall_fetch_glob_pmu_n4;
extern unsigned long xcall_receive_signal;
extern unsigned long xcall_new_mmu_context_version;
#ifdef CONFIG_KGDB
......@@ -1000,6 +1002,15 @@ void smp_fetch_global_regs(void)
smp_cross_call(&xcall_fetch_glob_regs, 0, 0, 0);
}
void smp_fetch_global_pmu(void)
{
if (tlb_type == hypervisor &&
sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
smp_cross_call(&xcall_fetch_glob_pmu_n4, 0, 0, 0);
else
smp_cross_call(&xcall_fetch_glob_pmu, 0, 0, 0);
}
/* We know that the window frames of the user have been flushed
* to the stack before we get here because all callers of us
* are flush_tlb_*() routines, and these run after flush_cache_*()
......
......@@ -481,8 +481,8 @@ xcall_sync_tick:
.globl xcall_fetch_glob_regs
xcall_fetch_glob_regs:
sethi %hi(global_reg_snapshot), %g1
or %g1, %lo(global_reg_snapshot), %g1
sethi %hi(global_cpu_snapshot), %g1
or %g1, %lo(global_cpu_snapshot), %g1
__GET_CPUID(%g2)
sllx %g2, 6, %g3
add %g1, %g3, %g1
......@@ -509,6 +509,66 @@ xcall_fetch_glob_regs:
stx %g3, [%g1 + GR_SNAP_THREAD]
retry
.globl xcall_fetch_glob_pmu
xcall_fetch_glob_pmu:
sethi %hi(global_cpu_snapshot), %g1
or %g1, %lo(global_cpu_snapshot), %g1
__GET_CPUID(%g2)
sllx %g2, 6, %g3
add %g1, %g3, %g1
rd %pic, %g7
stx %g7, [%g1 + (4 * 8)]
rd %pcr, %g7
stx %g7, [%g1 + (0 * 8)]
retry
.globl xcall_fetch_glob_pmu_n4
xcall_fetch_glob_pmu_n4:
sethi %hi(global_cpu_snapshot), %g1
or %g1, %lo(global_cpu_snapshot), %g1
__GET_CPUID(%g2)
sllx %g2, 6, %g3
add %g1, %g3, %g1
ldxa [%g0] ASI_PIC, %g7
stx %g7, [%g1 + (4 * 8)]
mov 0x08, %g3
ldxa [%g3] ASI_PIC, %g7
stx %g7, [%g1 + (5 * 8)]
mov 0x10, %g3
ldxa [%g3] ASI_PIC, %g7
stx %g7, [%g1 + (6 * 8)]
mov 0x18, %g3
ldxa [%g3] ASI_PIC, %g7
stx %g7, [%g1 + (7 * 8)]
mov %o0, %g2
mov %o1, %g3
mov %o5, %g7
mov HV_FAST_VT_GET_PERFREG, %o5
mov 3, %o0
ta HV_FAST_TRAP
stx %o1, [%g1 + (3 * 8)]
mov HV_FAST_VT_GET_PERFREG, %o5
mov 2, %o0
ta HV_FAST_TRAP
stx %o1, [%g1 + (2 * 8)]
mov HV_FAST_VT_GET_PERFREG, %o5
mov 1, %o0
ta HV_FAST_TRAP
stx %o1, [%g1 + (1 * 8)]
mov HV_FAST_VT_GET_PERFREG, %o5
mov 0, %o0
ta HV_FAST_TRAP
stx %o1, [%g1 + (0 * 8)]
mov %g2, %o0
mov %g3, %o1
mov %g7, %o5
retry
#ifdef DCACHE_ALIASING_POSSIBLE
.align 32
.globl xcall_flush_dcache_page_cheetah
......
......@@ -452,6 +452,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
NULL, /* v */
&sysrq_showstate_blocked_op, /* w */
/* x: May be registered on ppc/powerpc for xmon */
/* x: May be registered on sparc64 for global PMU dump */
NULL, /* x */
/* y: May be registered on sparc64 for global register dump */
NULL, /* y */
......
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