From: Yong Zhao <yong.zhao@amd.com>
Date: Tue, 1 May 2018 17:56:07 -0400
Subject: drm/amdkfd: Fix CP soft hang on APUs
Git-commit: f8ea72d097965617bba0d6773fd29d44070c5e1a
Patch-mainline: v4.20 or v4.20-rc7 (next release)
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
The problem happens on Raven and Carrizo. The context save handler
should not clear the high bits of PC_HI before extracting the bits
of IB_STS.
The bug is not relevant to VEGA10 until we enable demand paging.
Signed-off-by: Jay Cornwall <Jay.Cornwall@amd.com>
Signed-off-by: Yong Zhao <yong.zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h | 4 ++--
drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx8.asm | 3 +--
drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx9.asm | 3 +--
3 files changed, 4 insertions(+), 6 deletions(-)
--- a/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h
+++ b/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h
@@ -253,7 +253,6 @@ static const uint32_t cwsr_trap_gfx8_hex
0x00000072, 0x80728472,
0xc0211b7c, 0x00000072,
0x80728472, 0xbf8c007f,
- 0x8671ff71, 0x0000ffff,
0xbefc0073, 0xbefe006e,
0xbeff006f, 0x867375ff,
0x000003ff, 0xb9734803,
@@ -267,6 +266,7 @@ static const uint32_t cwsr_trap_gfx8_hex
0x8e738f73, 0x87767376,
0x8673ff74, 0x00800000,
0x8f739773, 0xb976f807,
+ 0x8671ff71, 0x0000ffff,
0x86fe7e7e, 0x86ea6a6a,
0xb974f802, 0xbf8a0000,
0x95807370, 0xbf810000,
@@ -530,7 +530,6 @@ static const uint32_t cwsr_trap_gfx9_hex
0x00000078, 0x80788478,
0xc0211cfa, 0x00000078,
0x80788478, 0xbf8cc07f,
- 0x866dff6d, 0x0000ffff,
0xbefc006f, 0xbefe007a,
0xbeff007b, 0x866f71ff,
0x000003ff, 0xb96f4803,
@@ -554,6 +553,7 @@ static const uint32_t cwsr_trap_gfx9_hex
0x8e6f8f6f, 0x876e6f6e,
0x866fff70, 0x00800000,
0x8f6f976f, 0xb96ef807,
+ 0x866dff6d, 0x0000ffff,
0x86fe7e7e, 0x86ea6a6a,
0xb970f802, 0xbf8a0000,
0x95806f6c, 0xbf810000,
--- a/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx8.asm
+++ b/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx8.asm
@@ -1015,8 +1015,6 @@ end
s_waitcnt lgkmcnt(0) //from now on, it is safe to restore STATUS and IB_STS
- s_and_b32 s_restore_pc_hi, s_restore_pc_hi, 0x0000ffff //pc[47:32] //Do it here in order not to affect STATUS
-
//for normal save & restore, the saved PC points to the next inst to execute, no adjustment needs to be made, otherwise:
if ((EMU_RUN_HACK) && (!EMU_RUN_HACK_RESTORE_NORMAL))
s_add_u32 s_restore_pc_lo, s_restore_pc_lo, 8 //pc[31:0]+8 //two back-to-back s_trap are used (first for save and second for restore)
@@ -1052,6 +1050,7 @@ end
s_lshr_b32 s_restore_m0, s_restore_m0, SQ_WAVE_STATUS_INST_ATC_SHIFT
s_setreg_b32 hwreg(HW_REG_IB_STS), s_restore_tmp
+ s_and_b32 s_restore_pc_hi, s_restore_pc_hi, 0x0000ffff //pc[47:32] //Do it here in order not to affect STATUS
s_and_b64 exec, exec, exec // Restore STATUS.EXECZ, not writable by s_setreg_b32
s_and_b64 vcc, vcc, vcc // Restore STATUS.VCCZ, not writable by s_setreg_b32
s_setreg_b32 hwreg(HW_REG_STATUS), s_restore_status // SCC is included, which is changed by previous salu
--- a/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx9.asm
+++ b/drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx9.asm
@@ -1067,8 +1067,6 @@ end
s_waitcnt lgkmcnt(0) //from now on, it is safe to restore STATUS and IB_STS
- s_and_b32 s_restore_pc_hi, s_restore_pc_hi, 0x0000ffff //pc[47:32] //Do it here in order not to affect STATUS
-
//for normal save & restore, the saved PC points to the next inst to execute, no adjustment needs to be made, otherwise:
if ((EMU_RUN_HACK) && (!EMU_RUN_HACK_RESTORE_NORMAL))
s_add_u32 s_restore_pc_lo, s_restore_pc_lo, 8 //pc[31:0]+8 //two back-to-back s_trap are used (first for save and second for restore)
@@ -1119,6 +1117,7 @@ end
s_lshr_b32 s_restore_m0, s_restore_m0, SQ_WAVE_STATUS_INST_ATC_SHIFT
s_setreg_b32 hwreg(HW_REG_IB_STS), s_restore_tmp
+ s_and_b32 s_restore_pc_hi, s_restore_pc_hi, 0x0000ffff //pc[47:32] //Do it here in order not to affect STATUS
s_and_b64 exec, exec, exec // Restore STATUS.EXECZ, not writable by s_setreg_b32
s_and_b64 vcc, vcc, vcc // Restore STATUS.VCCZ, not writable by s_setreg_b32
s_setreg_b32 hwreg(HW_REG_STATUS), s_restore_status // SCC is included, which is changed by previous salu