Am 20.07.21 um 02:49 schrieb Rodrigo Siqueira:
We don't have any mechanism for tracing FPU operations inside the display core, making the debug work a little bit tricky. This commit introduces a trace mechanism inside our DC_FP_START/END macros for trying to alleviate this problem.
Changes since V2:
- Make sure that we compile FPU operation only in the context that DCN is enabled.
Cc: Harry Wentland harry.wentland@amd.com Cc: Anson Jacob Anson.Jacob@amd.com Cc: Christian König christian.koenig@amd.com Cc: Hersen Wu hersenxs.wu@amd.com Cc: Aric Cyr aric.cyr@amd.com Signed-off-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com
.../gpu/drm/amd/display/amdgpu_dm/Makefile | 4 ++ .../amd/display/amdgpu_dm/amdgpu_dm_trace.h | 21 ++++++ .../gpu/drm/amd/display/amdgpu_dm/dc_fpu.c | 64 +++++++++++++++++++ .../gpu/drm/amd/display/amdgpu_dm/dc_fpu.h | 33 ++++++++++ drivers/gpu/drm/amd/display/dc/dc_trace.h | 3 + drivers/gpu/drm/amd/display/dc/os_types.h | 6 +- 6 files changed, 128 insertions(+), 3 deletions(-) create mode 100644 drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c create mode 100644 drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.h
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile b/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile index 91fb72c96545..718e123a3230 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile @@ -27,6 +27,10 @@
AMDGPUDM = amdgpu_dm.o amdgpu_dm_irq.o amdgpu_dm_mst_types.o amdgpu_dm_color.o
+ifdef CONFIG_DRM_AMD_DC_DCN +AMDGPUDM += dc_fpu.o +endif
- ifneq ($(CONFIG_DRM_AMD_DC),) AMDGPUDM += amdgpu_dm_services.o amdgpu_dm_helpers.o amdgpu_dm_pp_smu.o amdgpu_dm_psr.o endif
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h index 46a33f64cf8e..230bb12c405e 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h @@ -637,6 +637,27 @@ TRACE_EVENT(amdgpu_refresh_rate_track, __entry->refresh_rate_ns) );
+TRACE_EVENT(dcn_fpu,
TP_PROTO(bool begin, const char *function, const int line),TP_ARGS(begin, function, line),TP_STRUCT__entry(__field(bool, begin)__field(const char *, function)__field(int, line)),TP_fast_assign(__entry->begin = begin;__entry->function = function;__entry->line = line;),TP_printk("%s()+%d: %s",__entry->function,__entry->line,__entry->begin ? "begin" : "end")+);
#endif /* _AMDGPU_DM_TRACE_H_ */
#undef TRACE_INCLUDE_PATH
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c new file mode 100644 index 000000000000..d5d156a4517e --- /dev/null +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: MIT +/*
- Copyright 2021 Advanced Micro Devices, Inc.
- Permission is hereby granted, free of charge, to any person obtaining a
- copy of this software and associated documentation files (the "Software"),
- to deal in the Software without restriction, including without limitation
- the rights to use, copy, modify, merge, publish, distribute, sublicense,
- and/or sell copies of the Software, and to permit persons to whom the
- Software is furnished to do so, subject to the following conditions:
- The above copyright notice and this permission notice shall be included in
- all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
- OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- OTHER DEALINGS IN THE SOFTWARE.
- Authors: AMD
- */
+#include "dc_trace.h"
+#include <asm/fpu/api.h>
+/**
- dc_fpu_begin - Enables FPU protection
- @function_name: A string containing the function name for debug purposes
- (usually __func__)
- @line: A line number where DC_FP_START was invoked for debug purpose
- (usually __LINE__)
- This function is responsible for managing the use of kernel_fpu_begin() with
- the advantage of providing an event trace for debugging.
- Note: Do not call this function directly; always use DC_FP_START().
- */
+void dc_fpu_begin(const char *function_name, const int line) +{
- TRACE_DCN_FPU(true, function_name, line);
- kernel_fpu_begin();
+}
+/**
- dc_fpu_end - Disable FPU protection
- @function_name: A string containing the function name for debug purposes
- @line: A-line number where DC_FP_END was invoked for debug purpose
- This function is responsible for managing the use of kernel_fpu_end() with
- the advantage of providing an event trace for debugging.
- Note: Do not call this function directly; always use DC_FP_END().
- */
+void dc_fpu_end(const char *function_name, const int line) +{
- TRACE_DCN_FPU(false, function_name, line);
- kernel_fpu_end();
+} diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.h b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.h new file mode 100644 index 000000000000..fb54983c5c60 --- /dev/null +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: MIT */ +/*
- Copyright 2021 Advanced Micro Devices, Inc.
- Permission is hereby granted, free of charge, to any person obtaining a
- copy of this software and associated documentation files (the "Software"),
- to deal in the Software without restriction, including without limitation
- the rights to use, copy, modify, merge, publish, distribute, sublicense,
- and/or sell copies of the Software, and to permit persons to whom the
- Software is furnished to do so, subject to the following conditions:
- The above copyright notice and this permission notice shall be included in
- all copies or substantial portions of the Software.
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
- OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- OTHER DEALINGS IN THE SOFTWARE.
- Authors: AMD
- */
+#ifndef __DC_FPU_H__ +#define __DC_FPU_H__
+void dc_fpu_begin(const char *function_name, const int line); +void dc_fpu_end(const char *function_name, const int line);
+#endif /* __DC_FPU_H__ */ diff --git a/drivers/gpu/drm/amd/display/dc/dc_trace.h b/drivers/gpu/drm/amd/display/dc/dc_trace.h index d2615357269b..d598ba697e45 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_trace.h +++ b/drivers/gpu/drm/amd/display/dc/dc_trace.h @@ -37,3 +37,6 @@
#define TRACE_DCN_CLOCK_STATE(dcn_clocks) \ trace_amdgpu_dm_dc_clocks_state(dcn_clocks)
+#define TRACE_DCN_FPU(begin, function, line) \
- trace_dcn_fpu(begin, function, line)
diff --git a/drivers/gpu/drm/amd/display/dc/os_types.h b/drivers/gpu/drm/amd/display/dc/os_types.h index 126c2f3a4dd3..2ba49aef370d 100644 --- a/drivers/gpu/drm/amd/display/dc/os_types.h +++ b/drivers/gpu/drm/amd/display/dc/os_types.h @@ -52,9 +52,9 @@
#if defined(CONFIG_DRM_AMD_DC_DCN) #if defined(CONFIG_X86) -#include <asm/fpu/api.h> -#define DC_FP_START() kernel_fpu_begin() -#define DC_FP_END() kernel_fpu_end() +#include "amdgpu_dm/dc_fpu.h" +#define DC_FP_START() dc_fpu_begin(__func__, __LINE__) +#define DC_FP_END() dc_fpu_end(__func__, __LINE__)
This still has the issue that you don't correctly handle other architectures than x86.
I'm pretty sure the kernel bots will complain about that.
Regards, Christian.
#elif defined(CONFIG_PPC64) #include <asm/switch_to.h> #include <asm/cputable.h>