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Diffstat (limited to 'arch/powerpc/xmon/xmon.c')
-rw-r--r--arch/powerpc/xmon/xmon.c241
1 files changed, 195 insertions, 46 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 16321ad9e70c..f11f65634aab 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -29,7 +29,9 @@
#include <linux/nmi.h>
#include <linux/ctype.h>
+#include <asm/debugfs.h>
#include <asm/ptrace.h>
+#include <asm/smp.h>
#include <asm/string.h>
#include <asm/prom.h>
#include <asm/machdep.h>
@@ -48,7 +50,7 @@
#include <asm/reg.h>
#include <asm/debug.h>
#include <asm/hw_breakpoint.h>
-
+#include <asm/xive.h>
#include <asm/opal.h>
#include <asm/firmware.h>
@@ -76,6 +78,7 @@ static int xmon_gate;
#endif /* CONFIG_SMP */
static unsigned long in_xmon __read_mostly = 0;
+static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT);
static unsigned long adrs;
static int size = 1;
@@ -184,8 +187,6 @@ static void dump_tlb_44x(void);
static void dump_tlb_book3e(void);
#endif
-static int xmon_no_auto_backtrace;
-
#ifdef CONFIG_PPC64
#define REG "%.16lx"
#else
@@ -232,7 +233,13 @@ Commands:\n\
"\
dr dump stream of raw bytes\n\
dt dump the tracing buffers (uses printk)\n\
- e print exception information\n\
+"
+#ifdef CONFIG_PPC_POWERNV
+" dx# dump xive on CPU #\n\
+ dxi# dump xive irq state #\n\
+ dxa dump xive on all CPUs\n"
+#endif
+" e print exception information\n\
f flush cache\n\
la lookup symbol+offset of specified address\n\
ls lookup address of specified symbol\n\
@@ -411,7 +418,22 @@ int cpus_are_in_xmon(void)
{
return !cpumask_empty(&cpus_in_xmon);
}
-#endif
+
+static bool wait_for_other_cpus(int ncpus)
+{
+ unsigned long timeout;
+
+ /* We wait for 2s, which is a metric "little while" */
+ for (timeout = 20000; timeout != 0; --timeout) {
+ if (cpumask_weight(&cpus_in_xmon) >= ncpus)
+ return true;
+ udelay(100);
+ barrier();
+ }
+
+ return false;
+}
+#endif /* CONFIG_SMP */
static inline int unrecoverable_excp(struct pt_regs *regs)
{
@@ -433,7 +455,6 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
#ifdef CONFIG_SMP
int cpu;
int secondary;
- unsigned long timeout;
#endif
local_irq_save(flags);
@@ -520,13 +541,17 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
xmon_owner = cpu;
mb();
if (ncpus > 1) {
- smp_send_debugger_break();
- /* wait for other cpus to come in */
- for (timeout = 100000000; timeout != 0; --timeout) {
- if (cpumask_weight(&cpus_in_xmon) >= ncpus)
- break;
- barrier();
- }
+ /*
+ * A system reset (trap == 0x100) can be triggered on
+ * all CPUs, so when we come in via 0x100 try waiting
+ * for the other CPUs to come in before we send the
+ * debugger break (IPI). This is similar to
+ * crash_kexec_secondary().
+ */
+ if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus))
+ smp_send_debugger_break();
+
+ wait_for_other_cpus(ncpus);
}
remove_bpts();
disable_surveillance();
@@ -884,10 +909,7 @@ cmds(struct pt_regs *excp)
last_cmd = NULL;
xmon_regs = excp;
- if (!xmon_no_auto_backtrace) {
- xmon_no_auto_backtrace = 1;
- xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
- }
+ xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
for(;;) {
#ifdef CONFIG_SMP
@@ -1347,9 +1369,19 @@ const char *getvecname(unsigned long vec)
case 0x100: ret = "(System Reset)"; break;
case 0x200: ret = "(Machine Check)"; break;
case 0x300: ret = "(Data Access)"; break;
- case 0x380: ret = "(Data SLB Access)"; break;
+ case 0x380:
+ if (radix_enabled())
+ ret = "(Data Access Out of Range)";
+ else
+ ret = "(Data SLB Access)";
+ break;
case 0x400: ret = "(Instruction Access)"; break;
- case 0x480: ret = "(Instruction SLB Access)"; break;
+ case 0x480:
+ if (radix_enabled())
+ ret = "(Instruction Access Out of Range)";
+ else
+ ret = "(Instruction SLB Access)";
+ break;
case 0x500: ret = "(Hardware Interrupt)"; break;
case 0x600: ret = "(Alignment)"; break;
case 0x700: ret = "(Program Check)"; break;
@@ -2231,7 +2263,9 @@ static void dump_one_paca(int cpu)
DUMP(p, kernel_msr, "lx");
DUMP(p, emergency_sp, "p");
#ifdef CONFIG_PPC_BOOK3S_64
+ DUMP(p, nmi_emergency_sp, "p");
DUMP(p, mc_emergency_sp, "p");
+ DUMP(p, in_nmi, "x");
DUMP(p, in_mce, "x");
DUMP(p, hmi_event_available, "x");
#endif
@@ -2338,6 +2372,81 @@ static void dump_pacas(void)
}
#endif
+#ifdef CONFIG_PPC_POWERNV
+static void dump_one_xive(int cpu)
+{
+ unsigned int hwid = get_hard_smp_processor_id(cpu);
+
+ opal_xive_dump(XIVE_DUMP_TM_HYP, hwid);
+ opal_xive_dump(XIVE_DUMP_TM_POOL, hwid);
+ opal_xive_dump(XIVE_DUMP_TM_OS, hwid);
+ opal_xive_dump(XIVE_DUMP_TM_USER, hwid);
+ opal_xive_dump(XIVE_DUMP_VP, hwid);
+ opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid);
+
+ if (setjmp(bus_error_jmp) != 0) {
+ catch_memory_errors = 0;
+ printf("*** Error dumping xive on cpu %d\n", cpu);
+ return;
+ }
+
+ catch_memory_errors = 1;
+ sync();
+ xmon_xive_do_dump(cpu);
+ sync();
+ __delay(200);
+ catch_memory_errors = 0;
+}
+
+static void dump_all_xives(void)
+{
+ int cpu;
+
+ if (num_possible_cpus() == 0) {
+ printf("No possible cpus, use 'dx #' to dump individual cpus\n");
+ return;
+ }
+
+ for_each_possible_cpu(cpu)
+ dump_one_xive(cpu);
+}
+
+static void dump_one_xive_irq(u32 num)
+{
+ s64 rc;
+ __be64 vp;
+ u8 prio;
+ __be32 lirq;
+
+ rc = opal_xive_get_irq_config(num, &vp, &prio, &lirq);
+ xmon_printf("IRQ 0x%x config: vp=0x%llx prio=%d lirq=0x%x (rc=%lld)\n",
+ num, be64_to_cpu(vp), prio, be32_to_cpu(lirq), rc);
+}
+
+static void dump_xives(void)
+{
+ unsigned long num;
+ int c;
+
+ c = inchar();
+ if (c == 'a') {
+ dump_all_xives();
+ return;
+ } else if (c == 'i') {
+ if (scanhex(&num))
+ dump_one_xive_irq(num);
+ return;
+ }
+
+ termch = c; /* Put c back, it wasn't 'a' */
+
+ if (scanhex(&num))
+ dump_one_xive(num);
+ else
+ dump_one_xive(xmon_owner);
+}
+#endif /* CONFIG_PPC_POWERNV */
+
static void dump_by_size(unsigned long addr, long count, int size)
{
unsigned char temp[16];
@@ -2386,6 +2495,14 @@ dump(void)
return;
}
#endif
+#ifdef CONFIG_PPC_POWERNV
+ if (c == 'x') {
+ xmon_start_pagination();
+ dump_xives();
+ xmon_end_pagination();
+ return;
+ }
+#endif
if (c == '\n')
termch = c;
@@ -3070,23 +3187,28 @@ void dump_segments(void)
for (i = 0; i < mmu_slb_size; i++) {
asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i));
asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i));
- if (esid || vsid) {
- printf("%02d %016lx %016lx", i, esid, vsid);
- if (esid & SLB_ESID_V) {
- llp = vsid & SLB_VSID_LLP;
- if (vsid & SLB_VSID_B_1T) {
- printf(" 1T ESID=%9lx VSID=%13lx LLP:%3lx \n",
- GET_ESID_1T(esid),
- (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T,
- llp);
- } else {
- printf(" 256M ESID=%9lx VSID=%13lx LLP:%3lx \n",
- GET_ESID(esid),
- (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT,
- llp);
- }
- } else
- printf("\n");
+
+ if (!esid && !vsid)
+ continue;
+
+ printf("%02d %016lx %016lx", i, esid, vsid);
+
+ if (!(esid & SLB_ESID_V)) {
+ printf("\n");
+ continue;
+ }
+
+ llp = vsid & SLB_VSID_LLP;
+ if (vsid & SLB_VSID_B_1T) {
+ printf(" 1T ESID=%9lx VSID=%13lx LLP:%3lx \n",
+ GET_ESID_1T(esid),
+ (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T,
+ llp);
+ } else {
+ printf(" 256M ESID=%9lx VSID=%13lx LLP:%3lx \n",
+ GET_ESID(esid),
+ (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT,
+ llp);
}
}
}
@@ -3302,6 +3424,8 @@ static void sysrq_handle_xmon(int key)
/* ensure xmon is enabled */
xmon_init(1);
debugger(get_irq_regs());
+ if (!xmon_on)
+ xmon_init(0);
}
static struct sysrq_key_op sysrq_xmon_op = {
@@ -3315,10 +3439,37 @@ static int __init setup_xmon_sysrq(void)
register_sysrq_key('x', &sysrq_xmon_op);
return 0;
}
-__initcall(setup_xmon_sysrq);
+device_initcall(setup_xmon_sysrq);
#endif /* CONFIG_MAGIC_SYSRQ */
-static int __initdata xmon_early, xmon_off;
+#ifdef CONFIG_DEBUG_FS
+static int xmon_dbgfs_set(void *data, u64 val)
+{
+ xmon_on = !!val;
+ xmon_init(xmon_on);
+
+ return 0;
+}
+
+static int xmon_dbgfs_get(void *data, u64 *val)
+{
+ *val = xmon_on;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get,
+ xmon_dbgfs_set, "%llu\n");
+
+static int __init setup_xmon_dbgfs(void)
+{
+ debugfs_create_file("xmon", 0600, powerpc_debugfs_root, NULL,
+ &xmon_dbgfs_ops);
+ return 0;
+}
+device_initcall(setup_xmon_dbgfs);
+#endif /* CONFIG_DEBUG_FS */
+
+static int xmon_early __initdata;
static int __init early_parse_xmon(char *p)
{
@@ -3326,12 +3477,12 @@ static int __init early_parse_xmon(char *p)
/* just "xmon" is equivalent to "xmon=early" */
xmon_init(1);
xmon_early = 1;
- } else if (strncmp(p, "on", 2) == 0)
+ xmon_on = 1;
+ } else if (strncmp(p, "on", 2) == 0) {
xmon_init(1);
- else if (strncmp(p, "off", 3) == 0)
- xmon_off = 1;
- else if (strncmp(p, "nobt", 4) == 0)
- xmon_no_auto_backtrace = 1;
+ xmon_on = 1;
+ } else if (strncmp(p, "off", 3) == 0)
+ xmon_on = 0;
else
return 1;
@@ -3341,10 +3492,8 @@ early_param("xmon", early_parse_xmon);
void __init xmon_setup(void)
{
-#ifdef CONFIG_XMON_DEFAULT
- if (!xmon_off)
+ if (xmon_on)
xmon_init(1);
-#endif
if (xmon_early)
debugger(NULL);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.