[PATCH umr] Don't read SGPR if wave isn't halted.

[Xie, AlexBin]

Reviewed-by: Alex Xie <AlexBin.Xie at amd.com><mailto:AlexBin.Xie at amd.com>


________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Tom St Denis <tom.stdenis at amd.com>
Sent: Thursday, June 15, 2017 8:14:51 AM
To: amd-gfx at lists.freedesktop.org
Cc: StDenis, Tom
Subject: [PATCH umr] Don't read SGPR if wave isn't halted.

On previous generations this was allowed but on Vega10 it will result
in the occasional system hang.

Also like others wave status reading is only reliable if

1) the waves are halted/hung (core is active)
2) or, you disable CG/PG with cg_mask=pg_mask=0

Even with this patch hangs are possible if PG/CG are still enabled on
Vega10.

Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
 src/app/print_waves.c | 40 ++++++++++++++++++++++------------------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/src/app/print_waves.c b/src/app/print_waves.c
index e3662983d8d1..e157db9f9386 100644
--- a/src/app/print_waves.c
+++ b/src/app/print_waves.c
@@ -55,7 +55,8 @@ void umr_print_waves(struct umr_asic *asic)
                                 umr_get_wave_status(asic, se, sh, cu, simd, wave, &ws);
                                 if (ws.wave_status.halt || ws.wave_status.valid) {
                                         // grab sgprs..
-                                       umr_read_sgprs(asic, &ws, &sgprs[0]);
+                                       if (ws.wave_status.halt)
+                                               umr_read_sgprs(asic, &ws, &sgprs[0]);

                                         if (!options.bitfields && first) {
                                                 first = 0;
@@ -75,14 +76,15 @@ void umr_print_waves(struct umr_asic *asic)
 (unsigned long)ws.hw_id.value, (unsigned long)ws.gpr_alloc.value, (unsigned long)ws.lds_alloc.value, (unsigned long)ws.trapsts.value, (unsigned long)ws.ib_sts.value,
 (unsigned long)ws.tba_hi, (unsigned long)ws.tba_lo, (unsigned long)ws.tma_hi, (unsigned long)ws.tma_lo, (unsigned long)ws.ib_dbg0, (unsigned long)ws.m0
 );
-                                               for (x = 0; x < ((ws.gpr_alloc.sgpr_size + 1) << shift); x += 4)
-                                                       printf(">SGPRS[%u..%u] = { %08lx, %08lx, %08lx, %08lx }\n",
-                                                               (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x),
-                                                               (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x + 3),
-                                                               (unsigned long)sgprs[x],
-                                                               (unsigned long)sgprs[x+1],
-                                                               (unsigned long)sgprs[x+2],
-                                                               (unsigned long)sgprs[x+3]);
+                                               if (ws.wave_status.halt)
+                                                       for (x = 0; x < ((ws.gpr_alloc.sgpr_size + 1) << shift); x += 4)
+                                                               printf(">SGPRS[%u..%u] = { %08lx, %08lx, %08lx, %08lx }\n",
+                                                                       (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x),
+                                                                       (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x + 3),
+                                                                       (unsigned long)sgprs[x],
+                                                                       (unsigned long)sgprs[x+1],
+                                                                       (unsigned long)sgprs[x+2],
+                                                                       (unsigned long)sgprs[x+3]);

                                                 pgm_addr = (((uint64_t)ws.pc_hi << 32) | ws.pc_lo) - (sizeof(opcodes)/2);
                                                 umr_read_vram(asic, ws.hw_id.vm_id, pgm_addr, sizeof(opcodes), opcodes);
@@ -154,15 +156,17 @@ void umr_print_waves(struct umr_asic *asic)
                                                 PP(gpr_alloc, sgpr_base);
                                                 PP(gpr_alloc, sgpr_size);

-                                               printf("\n\nSGPRS:\n");
-                                               for (x = 0; x < ((ws.gpr_alloc.sgpr_size + 1) << shift); x += 4)
-                                                       printf("\t[%4u..%4u] = { %08lx, %08lx, %08lx, %08lx }\n",
-                                                               (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x),
-                                                               (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x + 3),
-                                                               (unsigned long)sgprs[x],
-                                                               (unsigned long)sgprs[x+1],
-                                                               (unsigned long)sgprs[x+2],
-                                                               (unsigned long)sgprs[x+3]);
+                                               if (ws.wave_status.halt) {
+                                                       printf("\n\nSGPRS:\n");
+                                                       for (x = 0; x < ((ws.gpr_alloc.sgpr_size + 1) << shift); x += 4)
+                                                               printf("\t[%4u..%4u] = { %08lx, %08lx, %08lx, %08lx }\n",
+                                                                       (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x),
+                                                                       (unsigned)((ws.gpr_alloc.sgpr_base << shift) + x + 3),
+                                                                       (unsigned long)sgprs[x],
+                                                                       (unsigned long)sgprs[x+1],
+                                                                       (unsigned long)sgprs[x+2],
+                                                                       (unsigned long)sgprs[x+3]);
+                                               }

                                                 printf("\n\nPGM_MEM:\n");
                                                 pgm_addr = (((uint64_t)ws.pc_hi << 32) | ws.pc_lo) - (sizeof(opcodes)/2);
--
2.12.0

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