diff mbox series

[2/4] drm/amd/display: Add FPU event trace

Message ID 20210331122502.1031073-3-Rodrigo.Siqueira@amd.com (mailing list archive)
State New, archived
Headers show
Series drm/amd/display: Base changes for isolating FPU operation in a single place | expand

Commit Message

Rodrigo Siqueira Jordao March 31, 2021, 12:25 p.m. UTC 
We don't have any mechanism for tracing FPU operations inside the
display core, making the debug work a little bit tricky. For trying to
alleviate this problem, this commit introduces a trace mechanism inside
our DC_FP_START/END macros.

Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/Makefile    |  3 +-
 .../amd/display/amdgpu_dm/amdgpu_dm_trace.h   | 21 +++++++
 .../gpu/drm/amd/display/amdgpu_dm/dc_fpu.c    | 61 +++++++++++++++++++
 .../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, 123 insertions(+), 4 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

Comments

kernel test robot March 31, 2021, 7:28 p.m. UTC | #1 
Hi Rodrigo,

I love your patch! Perhaps something to improve:

[auto build test WARNING on next-20210331]
[cannot apply to linus/master v5.12-rc5 v5.12-rc4 v5.12-rc3 v5.12-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Rodrigo-Siqueira/drm-amd-display-Base-changes-for-isolating-FPU-operation-in-a-single-place/20210331-202750
base:    7a43c78d0573e0bbbb0456b033e2b9a895b89464
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/5859110d0579f7ee57ca1b1840c3960492a9c0c0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Rodrigo-Siqueira/drm-amd-display-Base-changes-for-isolating-FPU-operation-in-a-single-place/20210331-202750
        git checkout 5859110d0579f7ee57ca1b1840c3960492a9c0c0
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/dc_fpu.c:41:6: warning: no previous prototype for 'dc_fpu_begin' [-Wmissing-prototypes]
      41 | void dc_fpu_begin(const char *function_name, const int line)
         |      ^~~~~~~~~~~~
>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/dc_fpu.c:57:6: warning: no previous prototype for 'dc_fpu_end' [-Wmissing-prototypes]
      57 | void dc_fpu_end(const char *function_name, const int line)
         |      ^~~~~~~~~~


vim +/dc_fpu_begin +41 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/dc_fpu.c

    30	
    31	/**
    32	 * dc_fpu_begin - Enables FPU protection
    33	 * @function_name: A string containing the function name for debug purposes
    34	 * @line: A-line number where DC_FP_START was invoked for debug purpose
    35	 *
    36	 * This function is responsible for managing the use of kernel_fpu_begin() with
    37	 * the advantage of providing an event trace for debugging.
    38	 *
    39	 * Note: Do not call this function directly; always use DC_FP_START().
    40	 */
  > 41	void dc_fpu_begin(const char *function_name, const int line)
    42	{
    43		TRACE_DCN_FPU(true, function_name, line);
    44		kernel_fpu_begin();
    45	}
    46	
    47	/**
    48	 * dc_fpu_end - Disable FPU protection
    49	 * @function_name: A string containing the function name for debug purposes
    50	 * @line: A-line number where DC_FP_END was invoked for debug purpose
    51	 *
    52	 * This function is responsible for managing the use of kernel_fpu_end() with
    53	 * the advantage of providing an event trace for debugging.
    54	 *
    55	 * Note: Do not call this function directly; always use DC_FP_END().
    56	 */
  > 57	void dc_fpu_end(const char *function_name, const int line)

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
kernel test robot March 31, 2021, 8:26 p.m. UTC | #2 
Hi Rodrigo,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20210331]
[cannot apply to linus/master v5.12-rc5 v5.12-rc4 v5.12-rc3 v5.12-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Rodrigo-Siqueira/drm-amd-display-Base-changes-for-isolating-FPU-operation-in-a-single-place/20210331-202750
base:    7a43c78d0573e0bbbb0456b033e2b9a895b89464
config: arc-allyesconfig (attached as .config)
compiler: arceb-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/5859110d0579f7ee57ca1b1840c3960492a9c0c0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Rodrigo-Siqueira/drm-amd-display-Base-changes-for-isolating-FPU-operation-in-a-single-place/20210331-202750
        git checkout 5859110d0579f7ee57ca1b1840c3960492a9c0c0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/dc_fpu.c:29:10: fatal error: asm/fpu/api.h: No such file or directory
      29 | #include <asm/fpu/api.h>
         |          ^~~~~~~~~~~~~~~
   compilation terminated.


vim +29 drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/dc_fpu.c

    28	
  > 29	#include <asm/fpu/api.h>
    30	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile b/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile
index 9a3b7bf8ab0b..7d3a7c6dbba3 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/Makefile
@@ -25,7 +25,8 @@ 
 
 
 
-AMDGPUDM = amdgpu_dm.o amdgpu_dm_irq.o amdgpu_dm_mst_types.o amdgpu_dm_color.o
+AMDGPUDM = amdgpu_dm.o amdgpu_dm_irq.o amdgpu_dm_mst_types.o amdgpu_dm_color.o \
+	dc_fpu.o
 
 ifneq ($(CONFIG_DRM_AMD_DC),)
 AMDGPUDM += amdgpu_dm_services.o amdgpu_dm_helpers.o amdgpu_dm_pp_smu.o
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..ff34007509de
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
@@ -0,0 +1,61 @@ 
+// 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
+ * @line: A-line number where DC_FP_START was invoked for debug purpose
+ *
+ * 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__)
 #elif defined(CONFIG_PPC64)
 #include <asm/switch_to.h>
 #include <asm/cputable.h>