[PATCH 2/2] powerpc/xmon: Fix output of XIVE IPI

[Cédric Le Goater]

When dumping the XIVE state of an CPU IPI, xmon does not check if the
CPU is started or not which can cause an error. Add a check for that
and change the output to be on one line just as the XIVE interrupts of
the machine.

Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
 arch/powerpc/sysdev/xive/common.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/sysdev/xive/common.c 
b/arch/powerpc/sysdev/xive/common.c
index 85a27ec49d34..20f45b8a52ab 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -237,25 +237,30 @@ static notrace void xive_dump_eq(const char *name, struct 
xive_q *q)
        i0 = be32_to_cpup(q->qpage + idx);
        idx = (idx + 1) & q->msk;
        i1 = be32_to_cpup(q->qpage + idx);
-       xmon_printf("  %s Q T=%d %08x %08x ...\n", name,
-                   q->toggle, i0, i1);
+       xmon_printf("%s idx=%d T=%d %08x %08x ...", name,
+                    q->idx, q->toggle, i0, i1);
 }
 
 notrace void xmon_xive_do_dump(int cpu)
 {
        struct xive_cpu *xc = per_cpu(xive_cpu, cpu);
 
-       xmon_printf("XIVE state for CPU %d:\n", cpu);
-       xmon_printf("  pp=%02x cppr=%02x\n", xc->pending_prio, xc->cppr);
-       xive_dump_eq("IRQ", &xc->queue[xive_irq_priority]);
+       xmon_printf("CPU %d:", cpu);
+       if (xc) {
+               xmon_printf("pp=%02x CPPR=%02x ", xc->pending_prio, xc->cppr);
+
 #ifdef CONFIG_SMP
-       {
-               u64 val = xive_esb_read(&xc->ipi_data, XIVE_ESB_GET);
-               xmon_printf("  IPI state: %x:%c%c\n", xc->hw_ipi,
-                       val & XIVE_ESB_VAL_P ? 'P' : 'p',
-                       val & XIVE_ESB_VAL_Q ? 'Q' : 'q');
-       }
+               {
+                       u64 val = xive_esb_read(&xc->ipi_data, XIVE_ESB_GET);
+
+                       xmon_printf("IPI=0x%08x PQ=%c%c ", xc->hw_ipi,
+                                   val & XIVE_ESB_VAL_P ? 'P' : '-',
+                                   val & XIVE_ESB_VAL_Q ? 'Q' : '-');
+               }
 #endif
+               xive_dump_eq("EQ", &xc->queue[xive_irq_priority]);
+       }
+       xmon_printf("\n");
 }
 
 int xmon_xive_get_irq_config(u32 hw_irq, struct irq_data *d)
-- 
2.21.0