7 files changed, 189 insertions, 23 deletions

diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt
index 642f84495b29..2a4cdda4828e 100644
--- a/Documentation/sysrq.txt
+++ b/Documentation/sysrq.txt
@@ -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]
 
diff --git a/arch/sparc/include/asm/ptrace.h b/arch/sparc/include/asm/ptrace.h
index 0c6f6b068289..da43bdc62294 100644
--- a/arch/sparc/include/asm/ptrace.h
+++ b/arch/sparc/include/asm/ptrace.h
@@ -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; \
diff --git a/arch/sparc/include/asm/smp_64.h b/arch/sparc/include/asm/smp_64.h
index 29862a9e9065..dd3bef4b9896 100644
--- a/arch/sparc/include/asm/smp_64.h
+++ b/arch/sparc/include/asm/smp_64.h
@@ -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) */
 
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index fcaa59421126..d778248ef3f8 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -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
 
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index 781bcb10b8bd..d94b878577b7 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -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_*()
diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index 874162a11ceb..f8e13d421fcb 100644
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -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
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 05728894a88c..16ee6cee07da 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -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 */