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drm/amdkfd: Support debugger in Navi1x trap handler

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- Preserve scalar GPRs ttmp[4:11] and ttmp13
- Add single step exception during context save workaround
- Remove incorrect PC adjustment during context save

Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Reviewed-by: Yong Zhao <Yong.Zhao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jay Cornwall 2019-11-21 12:41:11 -06:00 • committed by Alex Deucher
parent d0f1a85366
commit 3cefc7189c
2 changed files with 802 additions and 733 deletions
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1394
drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h
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File diff suppressed because it is too large Load diff

141
drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx10.asm
View file

@ -33,6 +33,8 @@
#define NO_SQC_STORE !ASIC_TARGET_NAVI1X
var SINGLE_STEP_MISSED_WORKAROUND = 1 //workaround for lost MODE.DEBUG_EN exception when SAVECTX raised
var SQ_WAVE_STATUS_INST_ATC_SHIFT = 23
var SQ_WAVE_STATUS_INST_ATC_MASK = 0x00800000
var SQ_WAVE_STATUS_SPI_PRIO_MASK = 0x00000006
@ -72,6 +74,8 @@ var SQ_WAVE_IB_STS_RCNT_SIZE = 6
var SQ_WAVE_IB_STS_RCNT_FIRST_REPLAY_MASK = 0x003F8000
var SQ_WAVE_IB_STS_RCNT_FIRST_REPLAY_MASK_NEG = 0x00007FFF
var SQ_WAVE_MODE_DEBUG_EN_MASK = 0x800
var SQ_BUF_RSRC_WORD1_ATC_SHIFT = 24
var SQ_BUF_RSRC_WORD3_MTYPE_SHIFT = 27
@ -109,17 +113,19 @@ var s_save_pc_hi = ttmp1
var s_save_exec_lo = ttmp2
var s_save_exec_hi = ttmp3
var s_save_status = ttmp12
var s_save_trapsts = ttmp5
var s_save_xnack_mask = ttmp6
var s_save_trapsts = ttmp15
var s_save_xnack_mask = s_save_trapsts
var s_wave_size = ttmp7
var s_save_buf_rsrc0 = ttmp8
var s_save_buf_rsrc1 = ttmp9
var s_save_buf_rsrc2 = ttmp10
var s_save_buf_rsrc3 = ttmp11
var s_save_mem_offset = ttmp14
var s_save_mem_offset = ttmp4
var s_save_alloc_size = s_save_trapsts
var s_save_tmp = s_save_buf_rsrc2
var s_save_m0 = ttmp15
var s_save_tmp = ttmp14
var s_save_m0 = ttmp5
var s_save_ttmps_lo = s_save_tmp
var s_save_ttmps_hi = s_save_trapsts
var S_RESTORE_BUF_RSRC_WORD1_STRIDE = S_SAVE_BUF_RSRC_WORD1_STRIDE
var S_RESTORE_BUF_RSRC_WORD3_MISC = S_SAVE_BUF_RSRC_WORD3_MISC
@ -141,23 +147,25 @@ var s_restore_spi_init_lo = exec_lo
var s_restore_spi_init_hi = exec_hi
var s_restore_mem_offset = ttmp12
var s_restore_alloc_size = ttmp3
var s_restore_tmp = ttmp6
var s_restore_tmp = ttmp2
var s_restore_mem_offset_save = s_restore_tmp
var s_restore_m0 = s_restore_alloc_size
var s_restore_mode = ttmp7
var s_restore_flat_scratch = ttmp2
var s_restore_flat_scratch = s_restore_tmp
var s_restore_pc_lo = ttmp0
var s_restore_pc_hi = ttmp1
var s_restore_exec_lo = ttmp14
var s_restore_exec_hi = ttmp15
var s_restore_status = ttmp4
var s_restore_trapsts = ttmp5
var s_restore_exec_lo = ttmp4
var s_restore_exec_hi = ttmp5
var s_restore_status = ttmp14
var s_restore_trapsts = ttmp15
var s_restore_xnack_mask = ttmp13
var s_restore_buf_rsrc0 = ttmp8
var s_restore_buf_rsrc1 = ttmp9
var s_restore_buf_rsrc2 = ttmp10
var s_restore_buf_rsrc3 = ttmp11
var s_restore_size = ttmp7
var s_restore_size = ttmp6
var s_restore_ttmps_lo = s_restore_tmp
var s_restore_ttmps_hi = s_restore_alloc_size
shader main
asic(DEFAULT)
@ -172,6 +180,24 @@ L_JUMP_TO_RESTORE:
L_SKIP_RESTORE:
s_getreg_b32 s_save_status, hwreg(HW_REG_STATUS) //save STATUS since we will change SCC
s_andn2_b32 s_save_status, s_save_status, SQ_WAVE_STATUS_SPI_PRIO_MASK
if SINGLE_STEP_MISSED_WORKAROUND
// No single step exceptions if MODE.DEBUG_EN=0.
s_getreg_b32 ttmp2, hwreg(HW_REG_MODE)
s_and_b32 ttmp2, ttmp2, SQ_WAVE_MODE_DEBUG_EN_MASK
s_cbranch_scc0 L_NO_SINGLE_STEP_WORKAROUND
// Second-level trap already handled exception if STATUS.HALT=1.
s_and_b32 ttmp2, s_save_status, SQ_WAVE_STATUS_HALT_MASK
// Prioritize single step exception over context save.
// Second-level trap will halt wave and RFE, re-entering for SAVECTX.
s_cbranch_scc0 L_FETCH_2ND_TRAP
L_NO_SINGLE_STEP_WORKAROUND:
end
s_getreg_b32 s_save_trapsts, hwreg(HW_REG_TRAPSTS)
s_and_b32 ttmp2, s_save_trapsts, SQ_WAVE_TRAPSTS_SAVECTX_MASK //check whether this is for save
s_cbranch_scc1 L_SAVE
@ -241,25 +267,11 @@ L_EXCP_CASE:
s_rfe_b64 [ttmp0, ttmp1]
L_SAVE:
//check whether there is mem_viol
s_getreg_b32 s_save_trapsts, hwreg(HW_REG_TRAPSTS)
s_and_b32 s_save_trapsts, s_save_trapsts, SQ_WAVE_TRAPSTS_MEM_VIOL_MASK
s_cbranch_scc0 L_NO_PC_REWIND
//if so, need rewind PC assuming GDS operation gets NACKed
s_mov_b32 s_save_tmp, 0
s_setreg_b32 hwreg(HW_REG_TRAPSTS, SQ_WAVE_TRAPSTS_MEM_VIOL_SHIFT, 1), s_save_tmp //clear mem_viol bit
s_and_b32 s_save_pc_hi, s_save_pc_hi, 0x0000ffff //pc[47:32]
s_sub_u32 s_save_pc_lo, s_save_pc_lo, 8 //pc[31:0]-8
s_subb_u32 s_save_pc_hi, s_save_pc_hi, 0x0
L_NO_PC_REWIND:
s_mov_b32 s_save_tmp, 0
s_setreg_b32 hwreg(HW_REG_TRAPSTS, SQ_WAVE_TRAPSTS_SAVECTX_SHIFT, 1), s_save_tmp //clear saveCtx bit
#if ASIC_TARGET_NAVI1X
s_getreg_b32 s_save_xnack_mask, hwreg(HW_REG_SHADER_XNACK_MASK)
s_getreg_b32 s_save_tmp, hwreg(HW_REG_IB_STS, SQ_WAVE_IB_STS_RCNT_SHIFT, SQ_WAVE_IB_STS_RCNT_SIZE)
s_lshl_b32 s_save_tmp, s_save_tmp, S_SAVE_PC_HI_RCNT_SHIFT
s_or_b32 s_save_pc_hi, s_save_pc_hi, s_save_tmp
@ -293,6 +305,21 @@ L_SLEEP:
s_waitcnt lgkmcnt(0)
#endif
// Save trap temporaries 4-11, 13 initialized by SPI debug dispatch logic
// ttmp SR memory offset : size(VGPR)+size(SGPR)+0x40
get_wave_size(s_save_ttmps_hi)
get_vgpr_size_bytes(s_save_ttmps_lo, s_save_ttmps_hi)
s_and_b32 s_save_ttmps_hi, s_save_spi_init_hi, 0xFFFF
s_add_u32 s_save_ttmps_lo, s_save_ttmps_lo, get_sgpr_size_bytes()
s_add_u32 s_save_ttmps_lo, s_save_ttmps_lo, s_save_spi_init_lo
s_addc_u32 s_save_ttmps_hi, s_save_ttmps_hi, 0x0
#if ASIC_TARGET_NAVI1X
s_store_dwordx4 [ttmp4, ttmp5, ttmp6, ttmp7], [s_save_ttmps_lo, s_save_ttmps_hi], 0x50 glc:1
s_store_dwordx4 [ttmp8, ttmp9, ttmp10, ttmp11], [s_save_ttmps_lo, s_save_ttmps_hi], 0x60 glc:1
s_store_dword ttmp13, [s_save_ttmps_lo, s_save_ttmps_hi], 0x74 glc:1
#endif
/* setup Resource Contants */
s_mov_b32 s_save_buf_rsrc0, s_save_spi_init_lo //base_addr_lo
s_and_b32 s_save_buf_rsrc1, s_save_spi_init_hi, 0x0000FFFF //base_addr_hi
@ -310,9 +337,13 @@ L_SLEEP:
/* global mem offset */
s_mov_b32 s_save_mem_offset, 0x0
s_getreg_b32 s_wave_size, hwreg(HW_REG_IB_STS2,SQ_WAVE_IB_STS2_WAVE64_SHIFT,SQ_WAVE_IB_STS2_WAVE64_SIZE)
s_lshl_b32 s_wave_size, s_wave_size, S_WAVE_SIZE
s_or_b32 s_wave_size, s_save_spi_init_hi, s_wave_size //share s_wave_size with exec_hi, it's at bit25
get_wave_size(s_wave_size)
#if ASIC_TARGET_NAVI1X
// Save and clear vector XNACK state late to free up SGPRs.
s_getreg_b32 s_save_xnack_mask, hwreg(HW_REG_SHADER_XNACK_MASK)
s_setreg_imm32_b32 hwreg(HW_REG_SHADER_XNACK_MASK), 0x0
#endif
/* save first 4 VGPRs, needed for SGPR save */
s_mov_b32 exec_lo, 0xFFFFFFFF //need every thread from now on
@ -371,8 +402,8 @@ L_SAVE_HWREG:
write_hwreg_to_mem(s_save_exec_hi, s_save_buf_rsrc0, s_save_mem_offset)
write_hwreg_to_mem(s_save_status, s_save_buf_rsrc0, s_save_mem_offset)
s_getreg_b32 s_save_trapsts, hwreg(HW_REG_TRAPSTS)
write_hwreg_to_mem(s_save_trapsts, s_save_buf_rsrc0, s_save_mem_offset)
s_getreg_b32 s_save_tmp, hwreg(HW_REG_TRAPSTS)
write_hwreg_to_mem(s_save_tmp, s_save_buf_rsrc0, s_save_mem_offset)
// Not used on Sienna_Cichlid but keep layout same for debugger.
write_hwreg_to_mem(s_save_xnack_mask, s_save_buf_rsrc0, s_save_mem_offset)
@ -650,9 +681,7 @@ L_RESTORE:
s_lshr_b32 s_restore_tmp, s_restore_tmp, (S_RESTORE_SPI_INIT_MTYPE_SHIFT-SQ_BUF_RSRC_WORD3_MTYPE_SHIFT)
s_or_b32 s_restore_buf_rsrc3, s_restore_buf_rsrc3, s_restore_tmp //or MTYPE
//determine it is wave32 or wave64
s_getreg_b32 s_restore_size, hwreg(HW_REG_IB_STS2,SQ_WAVE_IB_STS2_WAVE64_SHIFT,SQ_WAVE_IB_STS2_WAVE64_SIZE)
s_lshl_b32 s_restore_size, s_restore_size, S_WAVE_SIZE
s_or_b32 s_restore_size, s_restore_spi_init_hi, s_restore_size
get_wave_size(s_restore_size)
s_and_b32 s_restore_tmp, s_restore_spi_init_hi, S_RESTORE_SPI_INIT_FIRST_WAVE_MASK
s_cbranch_scc0 L_RESTORE_VGPR
@ -686,7 +715,7 @@ L_RESTORE_LDS_NORMAL:
s_mov_b32 s_restore_buf_rsrc2, 0x1000000 //NUM_RECORDS in bytes
s_lshr_b32 m0, s_wave_size, S_WAVE_SIZE
s_lshr_b32 m0, s_restore_size, S_WAVE_SIZE
s_and_b32 m0, m0, 1
s_cmp_eq_u32 m0, 1
s_mov_b32 m0, 0x0
@ -894,9 +923,6 @@ L_RESTORE_HWREG:
s_setreg_b32 hwreg(HW_REG_SHADER_FLAT_SCRATCH_HI), s_restore_flat_scratch
s_mov_b32 s_restore_tmp, s_restore_pc_hi
s_and_b32 s_restore_pc_hi, s_restore_tmp, 0x0000ffff //pc[47:32] //Do it here in order not to affect STATUS
s_mov_b32 m0, s_restore_m0
s_mov_b32 exec_lo, s_restore_exec_lo
s_mov_b32 exec_hi, s_restore_exec_hi
@ -913,26 +939,39 @@ L_RESTORE_HWREG:
s_setreg_b32 hwreg(HW_REG_TRAPSTS, SQ_WAVE_TRAPSTS_POST_SAVECTX_SHIFT, SQ_WAVE_TRAPSTS_POST_SAVECTX_SIZE), s_restore_m0
s_setreg_b32 hwreg(HW_REG_MODE), s_restore_mode
// Restore trap temporaries 4-11, 13 initialized by SPI debug dispatch logic
// ttmp SR memory offset : size(VGPR)+size(SGPR)+0x40
get_vgpr_size_bytes(s_restore_ttmps_lo, s_restore_size)
s_add_u32 s_restore_ttmps_lo, s_restore_ttmps_lo, get_sgpr_size_bytes()
s_add_u32 s_restore_ttmps_lo, s_restore_ttmps_lo, s_restore_buf_rsrc0
s_addc_u32 s_restore_ttmps_hi, s_restore_buf_rsrc1, 0x0
s_and_b32 s_restore_ttmps_hi, s_restore_ttmps_hi, 0xFFFF
s_load_dwordx4 [ttmp4, ttmp5, ttmp6, ttmp7], [s_restore_ttmps_lo, s_restore_ttmps_hi], 0x50 glc:1
s_load_dwordx4 [ttmp8, ttmp9, ttmp10, ttmp11], [s_restore_ttmps_lo, s_restore_ttmps_hi], 0x60 glc:1
s_load_dword ttmp13, [s_restore_ttmps_lo, s_restore_ttmps_hi], 0x74 glc:1
s_waitcnt lgkmcnt(0)
#if ASIC_TARGET_NAVI1X
s_and_b32 s_restore_m0, s_restore_tmp, S_SAVE_PC_HI_RCNT_MASK
s_and_b32 s_restore_m0, s_restore_pc_hi, S_SAVE_PC_HI_RCNT_MASK
s_lshr_b32 s_restore_m0, s_restore_m0, S_SAVE_PC_HI_RCNT_SHIFT
s_lshl_b32 s_restore_m0, s_restore_m0, SQ_WAVE_IB_STS_RCNT_SHIFT
s_mov_b32 s_restore_mode, 0x0
s_or_b32 s_restore_mode, s_restore_mode, s_restore_m0
s_and_b32 s_restore_m0, s_restore_tmp, S_SAVE_PC_HI_FIRST_REPLAY_MASK
s_mov_b32 s_restore_tmp, 0x0
s_or_b32 s_restore_tmp, s_restore_tmp, s_restore_m0
s_and_b32 s_restore_m0, s_restore_pc_hi, S_SAVE_PC_HI_FIRST_REPLAY_MASK
s_lshr_b32 s_restore_m0, s_restore_m0, S_SAVE_PC_HI_FIRST_REPLAY_SHIFT
s_lshl_b32 s_restore_m0, s_restore_m0, SQ_WAVE_IB_STS_FIRST_REPLAY_SHIFT
s_or_b32 s_restore_mode, s_restore_mode, s_restore_m0
s_and_b32 s_restore_m0, s_restore_tmp, S_SAVE_PC_HI_REPLAY_W64H_MASK
s_or_b32 s_restore_tmp, s_restore_tmp, s_restore_m0
s_and_b32 s_restore_m0, s_restore_pc_hi, S_SAVE_PC_HI_REPLAY_W64H_MASK
s_lshr_b32 s_restore_m0, s_restore_m0, S_SAVE_PC_HI_REPLAY_W64H_SHIFT
s_lshl_b32 s_restore_m0, s_restore_m0, SQ_WAVE_IB_STS_REPLAY_W64H_SHIFT
s_or_b32 s_restore_mode, s_restore_mode, s_restore_m0
s_or_b32 s_restore_tmp, s_restore_tmp, s_restore_m0
s_and_b32 s_restore_m0, s_restore_status, SQ_WAVE_STATUS_INST_ATC_MASK
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_mode
s_setreg_b32 hwreg(HW_REG_IB_STS), s_restore_tmp
#endif
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
@ -1022,9 +1061,7 @@ end
function get_vgpr_size_bytes(s_vgpr_size_byte, s_size)
s_getreg_b32 s_vgpr_size_byte, hwreg(HW_REG_GPR_ALLOC,SQ_WAVE_GPR_ALLOC_VGPR_SIZE_SHIFT,SQ_WAVE_GPR_ALLOC_VGPR_SIZE_SIZE)
s_add_u32 s_vgpr_size_byte, s_vgpr_size_byte, 1
s_lshr_b32 m0, s_size, S_WAVE_SIZE
s_and_b32 m0, m0, 1
s_cmp_eq_u32 m0, 1
s_bitcmp1_b32 s_size, S_WAVE_SIZE
s_cbranch_scc1 L_ENABLE_SHIFT_W64
s_lshl_b32 s_vgpr_size_byte, s_vgpr_size_byte, (2+7) //Number of VGPRs = (vgpr_size + 1) * 4 * 32 * 4 (non-zero value)
s_branch L_SHIFT_DONE
@ -1045,3 +1082,9 @@ end
function get_hwreg_size_bytes
return 128
end
function get_wave_size(s_reg)
s_getreg_b32 s_reg, hwreg(HW_REG_IB_STS2,SQ_WAVE_IB_STS2_WAVE64_SHIFT,SQ_WAVE_IB_STS2_WAVE64_SIZE)
s_lshl_b32 s_reg, s_reg, S_WAVE_SIZE
s_or_b32 s_reg, s_save_spi_init_hi, s_reg //share with exec_hi, it's at bit25
end