1 files changed, 181 insertions, 24 deletions

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 33351c6704b1..82e1a3ee6e0f 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -28,6 +28,7 @@
 #include <linux/bug.h>
 #include <linux/nmi.h>
 #include <linux/ctype.h>
+#include <linux/highmem.h>
 
 #include <asm/debugfs.h>
 #include <asm/ptrace.h>
@@ -127,6 +128,7 @@ static void byterev(unsigned char *, int);
 static void memex(void);
 static int bsesc(void);
 static void dump(void);
+static void show_pte(unsigned long);
 static void prdump(unsigned long, long);
 static int ppc_inst_dump(unsigned long, long, int);
 static void dump_log_buf(void);
@@ -234,6 +236,7 @@ Commands:\n\
 #endif
   "\
   dr	dump stream of raw bytes\n\
+  dv	dump virtual address translation \n\
   dt	dump the tracing buffers (uses printk)\n\
   dtc	dump the tracing buffers for current CPU (uses printk)\n\
 "
@@ -278,6 +281,7 @@ Commands:\n\
 #elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E)
 "  u	dump TLB\n"
 #endif
+"  U	show uptime information\n"
 "  ?	help\n"
 "  # n	limit output to n lines per page (for dp, dpa, dl)\n"
 "  zr	reboot\n\
@@ -530,14 +534,19 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
 
  waiting:
 	secondary = 1;
+	spin_begin();
 	while (secondary && !xmon_gate) {
 		if (in_xmon == 0) {
-			if (fromipi)
+			if (fromipi) {
+				spin_end();
 				goto leave;
+			}
 			secondary = test_and_set_bit(0, &in_xmon);
 		}
-		barrier();
+		spin_cpu_relax();
+		touch_nmi_watchdog();
 	}
+	spin_end();
 
 	if (!secondary && !xmon_gate) {
 		/* we are the first cpu to come in */
@@ -568,21 +577,25 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
 		mb();
 		xmon_gate = 1;
 		barrier();
+		touch_nmi_watchdog();
 	}
 
  cmdloop:
 	while (in_xmon) {
 		if (secondary) {
+			spin_begin();
 			if (cpu == xmon_owner) {
 				if (!test_and_set_bit(0, &xmon_taken)) {
 					secondary = 0;
+					spin_end();
 					continue;
 				}
 				/* missed it */
 				while (cpu == xmon_owner)
-					barrier();
+					spin_cpu_relax();
 			}
-			barrier();
+			spin_cpu_relax();
+			touch_nmi_watchdog();
 		} else {
 			cmd = cmds(regs);
 			if (cmd != 0) {
@@ -896,6 +909,26 @@ static void remove_cpu_bpts(void)
 	write_ciabr(0);
 }
 
+/* Based on uptime_proc_show(). */
+static void
+show_uptime(void)
+{
+	struct timespec uptime;
+
+	if (setjmp(bus_error_jmp) == 0) {
+		catch_memory_errors = 1;
+		sync();
+
+		get_monotonic_boottime(&uptime);
+		printf("Uptime: %lu.%.2lu seconds\n", (unsigned long)uptime.tv_sec,
+			((unsigned long)uptime.tv_nsec / (NSEC_PER_SEC/100)));
+
+		sync();
+		__delay(200);						\
+	}
+	catch_memory_errors = 0;
+}
+
 static void set_lpp_cmd(void)
 {
 	unsigned long lpp;
@@ -1031,6 +1064,9 @@ cmds(struct pt_regs *excp)
 			dump_tlb_book3e();
 			break;
 #endif
+		case 'U':
+			show_uptime();
+			break;
 		default:
 			printf("Unrecognized command: ");
 			do {
@@ -1554,7 +1590,7 @@ static void print_bug_trap(struct pt_regs *regs)
 	printf("kernel BUG at %s:%u!\n",
 	       bug->file, bug->line);
 #else
-	printf("kernel BUG at %p!\n", (void *)bug->bug_addr);
+	printf("kernel BUG at %px!\n", (void *)bug->bug_addr);
 #endif
 #endif /* CONFIG_BUG */
 }
@@ -1587,7 +1623,7 @@ static void excprint(struct pt_regs *fp)
 	printf("  current = 0x%lx\n", current);
 #ifdef CONFIG_PPC64
 	printf("  paca    = 0x%lx\t softe: %d\t irq_happened: 0x%02x\n",
-	       local_paca, local_paca->soft_enabled, local_paca->irq_happened);
+	       local_paca, local_paca->irq_soft_mask, local_paca->irq_happened);
 #endif
 	if (current) {
 		printf("    pid   = %ld, comm = %s\n",
@@ -2279,7 +2315,7 @@ static void dump_tracing(void)
 static void dump_one_paca(int cpu)
 {
 	struct paca_struct *p;
-#ifdef CONFIG_PPC_STD_MMU_64
+#ifdef CONFIG_PPC_BOOK3S_64
 	int i = 0;
 #endif
 
@@ -2293,7 +2329,7 @@ static void dump_one_paca(int cpu)
 
 	p = &paca[cpu];
 
-	printf("paca for cpu 0x%x @ %p:\n", cpu, p);
+	printf("paca for cpu 0x%x @ %px:\n", cpu, p);
 
 	printf(" %-*s = %s\n", 20, "possible", cpu_possible(cpu) ? "yes" : "no");
 	printf(" %-*s = %s\n", 20, "present", cpu_present(cpu) ? "yes" : "no");
@@ -2308,10 +2344,10 @@ static void dump_one_paca(int cpu)
 	DUMP(p, kernel_toc, "lx");
 	DUMP(p, kernelbase, "lx");
 	DUMP(p, kernel_msr, "lx");
-	DUMP(p, emergency_sp, "p");
+	DUMP(p, emergency_sp, "px");
 #ifdef CONFIG_PPC_BOOK3S_64
-	DUMP(p, nmi_emergency_sp, "p");
-	DUMP(p, mc_emergency_sp, "p");
+	DUMP(p, nmi_emergency_sp, "px");
+	DUMP(p, mc_emergency_sp, "px");
 	DUMP(p, in_nmi, "x");
 	DUMP(p, in_mce, "x");
 	DUMP(p, hmi_event_available, "x");
@@ -2320,7 +2356,7 @@ static void dump_one_paca(int cpu)
 	DUMP(p, hw_cpu_id, "x");
 	DUMP(p, cpu_start, "x");
 	DUMP(p, kexec_state, "x");
-#ifdef CONFIG_PPC_STD_MMU_64
+#ifdef CONFIG_PPC_BOOK3S_64
 	for (i = 0; i < SLB_NUM_BOLTED; i++) {
 		u64 esid, vsid;
 
@@ -2339,22 +2375,25 @@ static void dump_one_paca(int cpu)
 	DUMP(p, slb_cache_ptr, "x");
 	for (i = 0; i < SLB_CACHE_ENTRIES; i++)
 		printf(" slb_cache[%d]:        = 0x%016lx\n", i, p->slb_cache[i]);
+
+	DUMP(p, rfi_flush_fallback_area, "px");
 #endif
 	DUMP(p, dscr_default, "llx");
 #ifdef CONFIG_PPC_BOOK3E
-	DUMP(p, pgd, "p");
-	DUMP(p, kernel_pgd, "p");
-	DUMP(p, tcd_ptr, "p");
-	DUMP(p, mc_kstack, "p");
-	DUMP(p, crit_kstack, "p");
-	DUMP(p, dbg_kstack, "p");
+	DUMP(p, pgd, "px");
+	DUMP(p, kernel_pgd, "px");
+	DUMP(p, tcd_ptr, "px");
+	DUMP(p, mc_kstack, "px");
+	DUMP(p, crit_kstack, "px");
+	DUMP(p, dbg_kstack, "px");
 #endif
-	DUMP(p, __current, "p");
+	DUMP(p, __current, "px");
 	DUMP(p, kstack, "lx");
+	printf(" kstack_base          = 0x%016lx\n", p->kstack & ~(THREAD_SIZE - 1));
 	DUMP(p, stab_rr, "lx");
 	DUMP(p, saved_r1, "lx");
 	DUMP(p, trap_save, "x");
-	DUMP(p, soft_enabled, "x");
+	DUMP(p, irq_soft_mask, "x");
 	DUMP(p, irq_happened, "x");
 	DUMP(p, io_sync, "x");
 	DUMP(p, irq_work_pending, "x");
@@ -2366,7 +2405,7 @@ static void dump_one_paca(int cpu)
 #endif
 
 #ifdef CONFIG_PPC_POWERNV
-	DUMP(p, core_idle_state_ptr, "p");
+	DUMP(p, core_idle_state_ptr, "px");
 	DUMP(p, thread_idle_state, "x");
 	DUMP(p, thread_mask, "x");
 	DUMP(p, subcore_sibling_mask, "x");
@@ -2475,6 +2514,11 @@ static void dump_xives(void)
 	unsigned long num;
 	int c;
 
+	if (!xive_enabled()) {
+		printf("Xive disabled on this system\n");
+		return;
+	}
+
 	c = inchar();
 	if (c == 'a') {
 		dump_all_xives();
@@ -2574,6 +2618,9 @@ dump(void)
 		dump_log_buf();
 	} else if (c == 'o') {
 		dump_opal_msglog();
+	} else if (c == 'v') {
+		/* dump virtual to physical translation */
+		show_pte(adrs);
 	} else if (c == 'r') {
 		scanhex(&ndump);
 		if (ndump == 0)
@@ -2900,13 +2947,123 @@ static void show_task(struct task_struct *tsk)
 		(tsk->exit_state & EXIT_DEAD) ? 'E' :
 		(tsk->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
 
-	printf("%p %016lx %6d %6d %c %2d %s\n", tsk,
+	printf("%px %016lx %6d %6d %c %2d %s\n", tsk,
 		tsk->thread.ksp,
 		tsk->pid, tsk->parent->pid,
 		state, task_thread_info(tsk)->cpu,
 		tsk->comm);
 }
 
+#ifdef CONFIG_PPC_BOOK3S_64
+void format_pte(void *ptep, unsigned long pte)
+{
+	printf("ptep @ 0x%016lx = 0x%016lx\n", (unsigned long)ptep, pte);
+	printf("Maps physical address = 0x%016lx\n", pte & PTE_RPN_MASK);
+
+	printf("Flags = %s%s%s%s%s\n",
+	       (pte & _PAGE_ACCESSED) ? "Accessed " : "",
+	       (pte & _PAGE_DIRTY)    ? "Dirty " : "",
+	       (pte & _PAGE_READ)     ? "Read " : "",
+	       (pte & _PAGE_WRITE)    ? "Write " : "",
+	       (pte & _PAGE_EXEC)     ? "Exec " : "");
+}
+
+static void show_pte(unsigned long addr)
+{
+	unsigned long tskv = 0;
+	struct task_struct *tsk = NULL;
+	struct mm_struct *mm;
+	pgd_t *pgdp, *pgdir;
+	pud_t *pudp;
+	pmd_t *pmdp;
+	pte_t *ptep;
+
+	if (!scanhex(&tskv))
+		mm = &init_mm;
+	else
+		tsk = (struct task_struct *)tskv;
+
+	if (tsk == NULL)
+		mm = &init_mm;
+	else
+		mm = tsk->active_mm;
+
+	if (setjmp(bus_error_jmp) != 0) {
+		catch_memory_errors = 0;
+		printf("*** Error dumping pte for task %px\n", tsk);
+		return;
+	}
+
+	catch_memory_errors = 1;
+	sync();
+
+	if (mm == &init_mm) {
+		pgdp = pgd_offset_k(addr);
+		pgdir = pgd_offset_k(0);
+	} else {
+		pgdp = pgd_offset(mm, addr);
+		pgdir = pgd_offset(mm, 0);
+	}
+
+	if (pgd_none(*pgdp)) {
+		printf("no linux page table for address\n");
+		return;
+	}
+
+	printf("pgd  @ 0x%016lx\n", pgdir);
+
+	if (pgd_huge(*pgdp)) {
+		format_pte(pgdp, pgd_val(*pgdp));
+		return;
+	}
+	printf("pgdp @ 0x%016lx = 0x%016lx\n", pgdp, pgd_val(*pgdp));
+
+	pudp = pud_offset(pgdp, addr);
+
+	if (pud_none(*pudp)) {
+		printf("No valid PUD\n");
+		return;
+	}
+
+	if (pud_huge(*pudp)) {
+		format_pte(pudp, pud_val(*pudp));
+		return;
+	}
+
+	printf("pudp @ 0x%016lx = 0x%016lx\n", pudp, pud_val(*pudp));
+
+	pmdp = pmd_offset(pudp, addr);
+
+	if (pmd_none(*pmdp)) {
+		printf("No valid PMD\n");
+		return;
+	}
+
+	if (pmd_huge(*pmdp)) {
+		format_pte(pmdp, pmd_val(*pmdp));
+		return;
+	}
+	printf("pmdp @ 0x%016lx = 0x%016lx\n", pmdp, pmd_val(*pmdp));
+
+	ptep = pte_offset_map(pmdp, addr);
+	if (pte_none(*ptep)) {
+		printf("no valid PTE\n");
+		return;
+	}
+
+	format_pte(ptep, pte_val(*ptep));
+
+	sync();
+	__delay(200);
+	catch_memory_errors = 0;
+}
+#else
+static void show_pte(unsigned long addr)
+{
+	printf("show_pte not yet implemented\n");
+}
+#endif /* CONFIG_PPC_BOOK3S_64 */
+
 static void show_tasks(void)
 {
 	unsigned long tskv;
@@ -2919,7 +3076,7 @@ static void show_tasks(void)
 
 	if (setjmp(bus_error_jmp) != 0) {
 		catch_memory_errors = 0;
-		printf("*** Error dumping task %p\n", tsk);
+		printf("*** Error dumping task %px\n", tsk);
 		return;
 	}
 
@@ -3224,7 +3381,7 @@ static void xmon_print_symbol(unsigned long address, const char *mid,
 	printf("%s", after);
 }
 
-#ifdef CONFIG_PPC_STD_MMU_64
+#ifdef CONFIG_PPC_BOOK3S_64
 void dump_segments(void)
 {
 	int i;