diff options
Diffstat (limited to 'kernel/debug/kdb/kdb_bt.c')
| -rw-r--r-- | kernel/debug/kdb/kdb_bt.c | 129 |
1 files changed, 70 insertions, 59 deletions
diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c index b03e0e814e43..137ba73f56fc 100644 --- a/kernel/debug/kdb/kdb_bt.c +++ b/kernel/debug/kdb/kdb_bt.c @@ -12,7 +12,8 @@ #include <linux/ctype.h> #include <linux/string.h> #include <linux/kernel.h> -#include <linux/sched.h> +#include <linux/sched/signal.h> +#include <linux/sched/debug.h> #include <linux/kdb.h> #include <linux/nmi.h> #include "kdb_private.h" @@ -20,22 +21,18 @@ static void kdb_show_stack(struct task_struct *p, void *addr) { - int old_lvl = console_loglevel; - console_loglevel = 15; kdb_trap_printk++; - kdb_set_current_task(p); - if (addr) { - show_stack((struct task_struct *)p, addr); - } else if (kdb_current_regs) { -#ifdef CONFIG_X86 - show_stack(p, &kdb_current_regs->sp); -#else - show_stack(p, NULL); -#endif + + if (!addr && kdb_task_has_cpu(p)) { + int old_lvl = console_loglevel; + + console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH; + kdb_dump_stack_on_cpu(kdb_process_cpu(p)); + console_loglevel = old_lvl; } else { - show_stack(p, NULL); + show_stack(p, addr, KERN_EMERG); } - console_loglevel = old_lvl; + kdb_trap_printk--; } @@ -49,7 +46,7 @@ static void kdb_show_stack(struct task_struct *p, void *addr) * btp <pid> Kernel stack for <pid> * btt <address-expression> Kernel stack for task structure at * <address-expression> - * bta [DRSTCZEUIMA] All useful processes, optionally + * bta [state_chars>|A] All useful processes, optionally * filtered by state * btc [<cpu>] The current process on one cpu, * default is all cpus @@ -77,12 +74,12 @@ static void kdb_show_stack(struct task_struct *p, void *addr) */ static int -kdb_bt1(struct task_struct *p, unsigned long mask, - int argcount, int btaprompt) +kdb_bt1(struct task_struct *p, const char *mask, bool btaprompt) { - char buffer[2]; - if (kdb_getarea(buffer[0], (unsigned long)p) || - kdb_getarea(buffer[0], (unsigned long)(p+1)-1)) + char ch; + + if (kdb_getarea(ch, (unsigned long)p) || + kdb_getarea(ch, (unsigned long)(p+1)-1)) return KDB_BADADDR; if (!kdb_task_state(p, mask)) return 0; @@ -90,22 +87,46 @@ kdb_bt1(struct task_struct *p, unsigned long mask, kdb_ps1(p); kdb_show_stack(p, NULL); if (btaprompt) { - kdb_getstr(buffer, sizeof(buffer), - "Enter <q> to end, <cr> to continue:"); - if (buffer[0] == 'q') { - kdb_printf("\n"); + kdb_printf("Enter <q> to end, <cr> or <space> to continue:"); + do { + ch = kdb_getchar(); + } while (!strchr("\r\n q", ch)); + kdb_printf("\n"); + + /* reset the pager */ + kdb_nextline = 1; + + if (ch == 'q') return 1; - } } touch_nmi_watchdog(); return 0; } +static void +kdb_bt_cpu(unsigned long cpu) +{ + struct task_struct *kdb_tsk; + + if (cpu >= num_possible_cpus() || !cpu_online(cpu)) { + kdb_printf("WARNING: no process for cpu %ld\n", cpu); + return; + } + + /* If a CPU failed to round up we could be here */ + kdb_tsk = KDB_TSK(cpu); + if (!kdb_tsk) { + kdb_printf("WARNING: no task for cpu %ld\n", cpu); + return; + } + + kdb_bt1(kdb_tsk, "A", false); +} + int kdb_bt(int argc, const char **argv) { int diag; - int argcount = 5; int btaprompt = 1; int nextarg; unsigned long addr; @@ -117,25 +138,25 @@ kdb_bt(int argc, const char **argv) if (strcmp(argv[0], "bta") == 0) { struct task_struct *g, *p; unsigned long cpu; - unsigned long mask = kdb_task_state_string(argc ? argv[1] : - NULL); + const char *mask = argc ? argv[1] : kdbgetenv("PS"); + if (argc == 0) kdb_ps_suppressed(); /* Run the active tasks first */ for_each_online_cpu(cpu) { - p = kdb_curr_task(cpu); - if (kdb_bt1(p, mask, argcount, btaprompt)) + p = curr_task(cpu); + if (kdb_bt1(p, mask, btaprompt)) return 0; } /* Now the inactive tasks */ - kdb_do_each_thread(g, p) { + for_each_process_thread(g, p) { if (KDB_FLAG(CMD_INTERRUPT)) return 0; if (task_curr(p)) continue; - if (kdb_bt1(p, mask, argcount, btaprompt)) + if (kdb_bt1(p, mask, btaprompt)) return 0; - } kdb_while_each_thread(g, p); + } } else if (strcmp(argv[0], "btp") == 0) { struct task_struct *p; unsigned long pid; @@ -145,10 +166,8 @@ kdb_bt(int argc, const char **argv) if (diag) return diag; p = find_task_by_pid_ns(pid, &init_pid_ns); - if (p) { - kdb_set_current_task(p); - return kdb_bt1(p, ~0UL, argcount, 0); - } + if (p) + return kdb_bt1(p, "A", false); kdb_printf("No process with pid == %ld found\n", pid); return 0; } else if (strcmp(argv[0], "btt") == 0) { @@ -157,12 +176,9 @@ kdb_bt(int argc, const char **argv) diag = kdbgetularg((char *)argv[1], &addr); if (diag) return diag; - kdb_set_current_task((struct task_struct *)addr); - return kdb_bt1((struct task_struct *)addr, ~0UL, argcount, 0); + return kdb_bt1((struct task_struct *)addr, "A", false); } else if (strcmp(argv[0], "btc") == 0) { unsigned long cpu = ~0; - struct task_struct *save_current_task = kdb_current_task; - char buf[80]; if (argc > 1) return KDB_ARGCOUNT; if (argc == 1) { @@ -170,26 +186,21 @@ kdb_bt(int argc, const char **argv) if (diag) return diag; } - /* Recursive use of kdb_parse, do not use argv after - * this point */ - argv = NULL; if (cpu != ~0) { - if (cpu >= num_possible_cpus() || !cpu_online(cpu)) { - kdb_printf("no process for cpu %ld\n", cpu); - return 0; + kdb_bt_cpu(cpu); + } else { + /* + * Recursive use of kdb_parse, do not use argv after + * this point. + */ + argv = NULL; + kdb_printf("btc: cpu status: "); + kdb_parse("cpu\n"); + for_each_online_cpu(cpu) { + kdb_bt_cpu(cpu); + touch_nmi_watchdog(); } - sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu)); - kdb_parse(buf); - return 0; - } - kdb_printf("btc: cpu status: "); - kdb_parse("cpu\n"); - for_each_online_cpu(cpu) { - sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu)); - kdb_parse(buf); - touch_nmi_watchdog(); } - kdb_set_current_task(save_current_task); return 0; } else { if (argc) { @@ -201,7 +212,7 @@ kdb_bt(int argc, const char **argv) kdb_show_stack(kdb_current_task, (void *)addr); return 0; } else { - return kdb_bt1(kdb_current_task, ~0UL, argcount, 0); + return kdb_bt1(kdb_current_task, "A", false); } } |