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Subject[PATCH 15/16] add support for dumping spu info from xmon
From: Michael Ellerman <michael@ellerman.id.au>

This patch adds a command to xmon for dumping information about
spu structs. The command is 'sf' for "spu fields" perhaps, and
takes the spu number as an argument. This is the same value as the
spu->number field, or the "phys-id" value of a context when it is
bound to a physical spu.

We try to catch memory errors as we dump each field, hopefully this
will make the command reasonably robust, but YMMV. If people see a
need we can easily add more fields to the dump in future.

Output looks something like this:

0:mon> sf 0
Dumping spu fields at address c00000001ffd9e80:
number = 0x0
name = spe
devnode->full_name = /cpus/PowerPC,BE@0/spes/spe@0
nid = 0x0
local_store_phys = 0x20000000000
local_store = 0xd0000800801e0000
ls_size = 0x0
isrc = 0x4
node = 0x0
flags = 0x0
dar = 0x0
dsisr = 0x0
class_0_pending = 0
irqs[0] = 0x16
irqs[1] = 0x17
irqs[2] = 0x24
slb_replace = 0x0
pid = 0
prio = 0
mm = 0x0000000000000000
ctx = 0x0000000000000000
rq = 0x0000000000000000
timestamp = 0x0000000000000000
problem_phys = 0x20000040000
problem = 0xd000080080220000
problem->spu_runcntl_RW = 0x0
problem->spu_status_R = 0x0
problem->spu_npc_RW = 0x0
priv1 = 0xd000080080240000
priv1->mfc_sr1_RW = 0x33
priv2 = 0xd000080080250000

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

---
arch/powerpc/xmon/xmon.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 67 insertions(+), 1 deletion(-)
Index: linux-2.6/arch/powerpc/xmon/xmon.c
===================================================================
--- linux-2.6.orig/arch/powerpc/xmon/xmon.c
+++ linux-2.6/arch/powerpc/xmon/xmon.c
@@ -216,7 +216,8 @@ Commands:\n\
s single step\n"
#ifdef CONFIG_PPC_CELL
" ss stop execution on all spus\n\
- sr restore execution on stopped spus\n"
+ sr restore execution on stopped spus\n\
+ sf # dump spu fields for spu # (in hex)\n"
#endif
" S print special registers\n\
t print backtrace\n\
@@ -2744,8 +2745,66 @@ static void restart_spus(void)
}
}

+#define DUMP_WIDTH 23
+#define DUMP_FIELD(obj, format, field) \
+do { \
+ if (setjmp(bus_error_jmp) == 0) { \
+ catch_memory_errors = 1; \
+ sync(); \
+ printf(" %-*s = "format"\n", DUMP_WIDTH, \
+ #field, obj->field); \
+ sync(); \
+ __delay(200); \
+ } else { \
+ catch_memory_errors = 0; \
+ printf(" %-*s = *** Error reading field.\n", \
+ DUMP_WIDTH, #field); \
+ } \
+ catch_memory_errors = 0; \
+} while (0)
+
+static void dump_spu_fields(struct spu *spu)
+{
+ printf("Dumping spu fields at address %p:\n", spu);
+
+ DUMP_FIELD(spu, "0x%x", number);
+ DUMP_FIELD(spu, "%s", name);
+ DUMP_FIELD(spu, "%s", devnode->full_name);
+ DUMP_FIELD(spu, "0x%x", nid);
+ DUMP_FIELD(spu, "0x%lx", local_store_phys);
+ DUMP_FIELD(spu, "0x%p", local_store);
+ DUMP_FIELD(spu, "0x%lx", ls_size);
+ DUMP_FIELD(spu, "0x%x", node);
+ DUMP_FIELD(spu, "0x%lx", flags);
+ DUMP_FIELD(spu, "0x%lx", dar);
+ DUMP_FIELD(spu, "0x%lx", dsisr);
+ DUMP_FIELD(spu, "%d", class_0_pending);
+ DUMP_FIELD(spu, "0x%lx", irqs[0]);
+ DUMP_FIELD(spu, "0x%lx", irqs[1]);
+ DUMP_FIELD(spu, "0x%lx", irqs[2]);
+ DUMP_FIELD(spu, "0x%x", slb_replace);
+ DUMP_FIELD(spu, "%d", pid);
+ DUMP_FIELD(spu, "%d", prio);
+ DUMP_FIELD(spu, "0x%p", mm);
+ DUMP_FIELD(spu, "0x%p", ctx);
+ DUMP_FIELD(spu, "0x%p", rq);
+ DUMP_FIELD(spu, "0x%p", timestamp);
+ DUMP_FIELD(spu, "0x%lx", problem_phys);
+ DUMP_FIELD(spu, "0x%p", problem);
+ DUMP_FIELD(spu, "0x%x", problem->spu_runcntl_RW);
+ DUMP_FIELD(spu, "0x%x", problem->spu_status_R);
+ DUMP_FIELD(spu, "0x%x", problem->spu_npc_RW);
+ DUMP_FIELD(spu, "0x%p", priv1);
+
+ if (spu->priv1)
+ DUMP_FIELD(spu, "0x%lx", priv1->mfc_sr1_RW);
+
+ DUMP_FIELD(spu, "0x%p", priv2);
+}
+
static int do_spu_cmd(void)
{
+ unsigned long num = 0;
int cmd;

cmd = inchar();
@@ -2756,6 +2815,12 @@ static int do_spu_cmd(void)
case 'r':
restart_spus();
break;
+ case 'f':
+ if (scanhex(&num) && num < XMON_NUM_SPUS && spu_info[num].spu)
+ dump_spu_fields(spu_info[num].spu);
+ else
+ printf("*** Error: invalid spu number\n");
+ break;
default:
return -1;
}
--

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