[SPARC64]: Give more accurate errors in dr_cpu_configure().

When cpu_up() fails, we can discern the most likely cause.

If cpu_present() is false, this means the cpu did not appear
in the MD.  If -ENODEV is the error return value, then
the processor did not boot properly into the kernel.

Pass this information back in the dr-cpu response packet.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 3 deletions

diff --git a/arch/sparc64/kernel/ds.c b/arch/sparc64/kernel/ds.c
index d412cf876ab4..b6331718ee0c 100644
--- a/arch/sparc64/kernel/ds.c
+++ b/arch/sparc64/kernel/ds.c
@@ -535,11 +535,21 @@ static int dr_cpu_configure(struct ds_cap_state *cp, u64 req_num,
                 printk(KERN_INFO PFX "Starting cpu %d...\n", cpu);
                 err = cpu_up(cpu);
                 if (err) {
+                        __u32 res = DR_CPU_RES_FAILURE;
+                        __u32 stat = DR_CPU_STAT_UNCONFIGURED;
+
+                        if (!cpu_present(cpu)) {
+                                /* CPU not present in MD */
+                                res = DR_CPU_RES_NOT_IN_MD;
+                                stat = DR_CPU_STAT_NOT_PRESENT;
+                        } else if (err == -ENODEV) {
+                                /* CPU did not call in successfully */
+                                res = DR_CPU_RES_CPU_NOT_RESPONDING;
+                        }
+
                         printk(KERN_INFO PFX "CPU startup failed err=%d\n",
                                err);
-                        dr_cpu_mark(resp, cpu, ncpus,
-                                    DR_CPU_RES_FAILURE,
-                                    DR_CPU_STAT_UNCONFIGURED);
+                        dr_cpu_mark(resp, cpu, ncpus, res, stat);
                 }
         }