diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c index fb02ea7d2b2de73f210a0e4a8acd7d45e7c7fa13..4efcde1b9d5463612603dfe2a6a7a1476f13ec84 100644 --- a/arch/x86/platform/uv/uv_nmi.c +++ b/arch/x86/platform/uv/uv_nmi.c @@ -139,6 +139,19 @@ module_param_named(wait_count, uv_nmi_wait_count, int, 0644); static int uv_nmi_retry_count = 500; module_param_named(retry_count, uv_nmi_retry_count, int, 0644); +/* + * Valid NMI Actions: + * "dump" - dump process stack for each cpu + * "ips" - dump IP info for each cpu + */ +static char uv_nmi_action[8] = "dump"; +module_param_string(action, uv_nmi_action, sizeof(uv_nmi_action), 0644); + +static inline bool uv_nmi_action_is(const char *action) +{ + return (strncmp(uv_nmi_action, action, strlen(action)) == 0); +} + /* Setup which NMI support is present in system */ static void uv_nmi_setup_mmrs(void) { @@ -367,13 +380,38 @@ static void uv_nmi_wait(int master) 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 = " ................................. "; - printk(KERN_DEFAULT "UV:%sNMI process trace for CPU %d\n", dots, cpu); - show_regs(regs); + 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); } @@ -420,7 +458,8 @@ static void uv_nmi_dump_state(int cpu, struct pt_regs *regs, int master) int ignored = 0; int saved_console_loglevel = console_loglevel; - pr_alert("UV: tracing processes for %d CPUs from CPU %d\n", + 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; @@ -482,7 +521,8 @@ int uv_handle_nmi(unsigned int reason, struct pt_regs *regs) uv_nmi_wait(master); /* Dump state of each cpu */ - uv_nmi_dump_state(cpu, regs, master); + if (uv_nmi_action_is("ips") || uv_nmi_action_is("dump")) + uv_nmi_dump_state(cpu, regs, master); /* Clear per_cpu "in nmi" flag */ atomic_set(&uv_cpu_nmi.state, UV_NMI_STATE_OUT);