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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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drm/amdkfd: disable shader message vgpr deallocation on gc 12.1

Shader messages to deallocate VGPRs prior to shader end can prevent
the trap handler from saving context, making debugging and core dumps
unreliable.

VGPR deallocations for performance gain is negligible.
GC 12.1 will NOP shader VGPR deallocation messages via HW
settings on driver boot.

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Acked-by: Harish Kasiviswanathan <harish.kasiviswanathan@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

authored by

Jonathan Kim and committed by
Alex Deucher cf356fe1 8e0187ae

+5
+5
drivers/gpu/drm/amd/amdgpu/gfx_v12_1.c
··· 1362 1362 data = RREG32_SOC15(GC, GET_INST(GC, xcc_id), regSPI_GDBG_PER_VMID_CNTL); 1363 1363 data = REG_SET_FIELD(data, SPI_GDBG_PER_VMID_CNTL, TRAP_EN, 1); 1364 1364 WREG32_SOC15(GC, GET_INST(GC, xcc_id), regSPI_GDBG_PER_VMID_CNTL, data); 1365 + 1366 + /* Disable VGPR deallocation instruction for each KFD vmid. */ 1367 + data = RREG32_SOC15(GC, GET_INST(GC, xcc_id), regSQ_DEBUG); 1368 + data = REG_SET_FIELD(data, SQ_DEBUG, DISABLE_VGPR_DEALLOC, 1); 1369 + WREG32_SOC15(GC, GET_INST(GC, xcc_id), regSQ_DEBUG, data); 1365 1370 } 1366 1371 soc_v1_0_grbm_select(adev, 0, 0, 0, 0, GET_INST(GC, xcc_id)); 1367 1372 mutex_unlock(&adev->srbm_mutex);