[Intel-gfx] [PATCH 3/4] i915: add -DDYNAMIC_DEBUG_MODULE to i915/gvt/Makefile

[Intel-gfx] [PATCH 3/4] i915: add -DDYNAMIC_DEBUG_MODULE to i915/gvt/Makefile

[Jim Cromie]

This addition to cflags enables dyndbg in the gvt component of the
i915 module, on a CONFIG_DYNAMIC_DEBUG_CORE build.

So here are the message classifications that the gvt driver uses.

   cut -d= -f2 | cut -d\  -f2,3 | \
   perl -ne 'chomp $_ && $h{$_}++; END{print "$_\" \tseen $h{$_}\n" for sort keys %h}'

"gvt: cmd:" 	seen 11
"gvt: core:" 	seen 48
"gvt: dpy:" 	seen 4
"gvt: el:" 	seen 21
"gvt: irq:" 	seen 1
"gvt: mm:" 	seen 6
"gvt: mmio:" 	seen 9
"gvt: render:" 	seen 1
"gvt: sched:" 	seen 15

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 drivers/gpu/drm/i915/gvt/Makefile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/Makefile b/drivers/gpu/drm/i915/gvt/Makefile
index ea8324abc784..2c581e910688 100644
--- a/drivers/gpu/drm/i915/gvt/Makefile
+++ b/drivers/gpu/drm/i915/gvt/Makefile
@@ -5,5 +5,6 @@ GVT_SOURCE := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o firmware.o \
 	execlist.o scheduler.o sched_policy.o mmio_context.o cmd_parser.o debugfs.o \
 	fb_decoder.o dmabuf.o page_track.o
 
-ccflags-y				+= -I $(srctree)/$(src) -I $(srctree)/$(src)/$(GVT_DIR)/
-i915-y					+= $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))
+ccflags-y	+= -I $(srctree)/$(src) -I $(srctree)/$(src)/$(GVT_DIR)/
+ccflags-y	+= -DDYNAMIC_DEBUG_MODULE
+i915-y		+= $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))
-- 
2.26.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] [PATCH 4/4] i915: POC use dynamic_debug_exec_queries to control pr_debugs in gvt

[Jim Cromie]

The gvt component of this driver has ~120 pr_debugs, in 9 "classes".
Add a "knob", like drm.debug, to map bits to these classes.

bash-5.0# echo 0x01 > /sys/module/i915/parameters/debug_dyn
 set_dyndbg: result:0x1 from 0x01
 dyndbg: query 0: "format='^gvt: cmd: ' +p"
 dyndbg: entry, buf:'format='^gvt: cmd: ' +p'
 dyndbg: start-of-word:0 'format='^gvt: cmd: ' +p'
 dyndbg: start-of-word:1 ''^gvt: cmd: ' +p'
 dyndbg: start-of-word:2 '+p'
 dyndbg: split into words: "format" "^gvt: cmd: " "+p"
 dyndbg: op='+'
 dyndbg: flags=0x1
 dyndbg: *flagsp=0x1 *maskp=0xffffffff
 dyndbg: key:'format' arg:'^gvt: cmd: '
 dyndbg: parsed: func="" file="" module="i915" format="^gvt: cmd: " lineno=0-0
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:3081 [i915]init_cmd_table =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:1376 [i915]gen8_check_mi_display_flip =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:1373 [i915]gen8_check_mi_display_flip =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:745 [i915]parser_exec_state_dump =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:744 [i915]parser_exec_state_dump =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:742 [i915]parser_exec_state_dump =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:733 [i915]parser_exec_state_dump =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:729 [i915]parser_exec_state_dump =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:722 [i915]parser_exec_state_dump =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:716 [i915]parser_exec_state_dump =p
 dyndbg: changed drivers/gpu/drm/i915/gvt/cmd_parser.c:691 [i915]print_opcode =p
 dyndbg: applied: func="" file="" module="i915" format="^gvt: cmd: " lineno=0-0
 dyndbg: processed 1 queries, with 11 matches, 0 errs
 change ct:11 on format='gvt: cmd: '
 change ct:11

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 drivers/gpu/drm/i915/i915_params.c | 76 ++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 8d8db9ff0a48..4e1f01ab4865 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -255,3 +255,79 @@ void i915_params_free(struct i915_params *params)
 	I915_PARAMS_FOR_EACH(FREE);
 #undef FREE
 }
+
+/* POC for callback -> dynamic_debug_exec_queries */
+unsigned long __new_knob;
+EXPORT_SYMBOL(__new_knob);
+
+static char *pr_debug_classes[] = {
+	"gvt: cmd: ",
+	"gvt: core: ",
+	"gvt: dpy: ",
+	"gvt: el: ",
+	"gvt: irq: ",
+	"gvt: mm: ",
+	"gvt: mmio: ",
+	"gvt: render: ",
+	"gvt: sched: "
+};
+#define NUM_CLASSES	ARRAY_SIZE(pr_debug_classes)
+#define OUR_QUERY_SIZE	128 /* we need about 20 */
+
+#include <linux/module.h>
+
+static int param_set_dyndbg(const char *instr, const struct kernel_param *kp)
+{
+	static unsigned long int old_val;
+        unsigned int val;
+	unsigned long int changes, result;
+	int rc, chgct = 0, totct = 0, bitpos;
+	char query[OUR_QUERY_SIZE];
+
+	rc = kstrtouint(instr, 0, &val);
+	if (rc) {
+		pr_err("set_dyndbg: failed\n");
+		return -EINVAL;
+	}
+	result = val;
+	pr_info("set_dyndbg: result:0x%lx from %s\n", result, instr);
+
+	changes = result ^ old_val;
+
+	for_each_set_bit(bitpos, &changes, NUM_CLASSES) {
+
+		sprintf(query, "format='^%s' %cp", pr_debug_classes[bitpos],
+			test_bit(bitpos, &result) ? '+' : '-');
+
+		chgct = dynamic_debug_exec_queries(query, "i915");
+		totct += chgct;
+		pr_info("change ct:%d on format='%s'\n", chgct,
+			pr_debug_classes[bitpos]);
+	}
+	old_val = result;
+	pr_info("change ct:%d\n", totct);
+	return 0;
+}
+static int param_get_dyndbg(char *buffer, const struct kernel_param *kp)
+{
+	return scnprintf(buffer, PAGE_SIZE, "%u\n",
+			 *((unsigned int *)kp->arg));
+}
+static const struct kernel_param_ops param_ops_dyndbg = {
+	.set = param_set_dyndbg,
+	.get = param_get_dyndbg,
+};
+
+MODULE_PARM_DESC(debug_dyn, " enable dynamic-debug by format-string classifications.\n"
+		 "\t\twhich are:"
+		 "\n\t\t gvt: cmd:"
+		 "\n\t\t gvt: core:"
+		 "\n\t\t gvt: dpy:"
+		 "\n\t\t gvt: el:"
+		 "\n\t\t gvt: irq:"
+		 "\n\t\t gvt: mm:"
+		 "\n\t\t gvt: mmio:"
+		 "\n\t\t gvt: render:"
+		 "\n\t\t gvt: sched:" "\n");
+
+module_param_cb(debug_dyn, &param_ops_dyndbg, &__new_knob, 0644);
-- 
2.26.2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 4/4] i915: POC use dynamic_debug_exec_queries to control pr_debugs in gvt

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 3279 bytes --]

Hi Jim,

I love your patch! Yet something to improve:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on linux/master tegra-drm/drm/tegra/for-next drm-tip/drm-tip linus/master v5.9-rc2 next-20200826]
[cannot apply to drm/drm-next]
[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/Jim-Cromie/dyndbg-POC-use-dynamic_debug_exec_queries-in-DRM/20200827-010409
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # 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 errors (new ones prefixed by >>):

   drivers/gpu/drm/i915/i915_params.c: In function 'param_set_dyndbg':
>> drivers/gpu/drm/i915/i915_params.c:307:11: error: implicit declaration of function 'dynamic_debug_exec_queries' [-Werror=implicit-function-declaration]
     307 |   chgct = dynamic_debug_exec_queries(query, "i915");
         |           ^~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

# https://github.com/0day-ci/linux/commit/1b9bcd2cceed427d96bc9bf4eae6619201d645d6
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Jim-Cromie/dyndbg-POC-use-dynamic_debug_exec_queries-in-DRM/20200827-010409
git checkout 1b9bcd2cceed427d96bc9bf4eae6619201d645d6
vim +/dynamic_debug_exec_queries +307 drivers/gpu/drm/i915/i915_params.c

   283	
   284	static int param_set_dyndbg(const char *instr, const struct kernel_param *kp)
   285	{
   286		static unsigned long int old_val;
   287	        unsigned int val;
   288		unsigned long int changes, result;
   289		int rc, chgct = 0, totct = 0, bitpos;
   290		char query[OUR_QUERY_SIZE];
   291	
   292		rc = kstrtouint(instr, 0, &val);
   293		if (rc) {
   294			pr_err("set_dyndbg: failed\n");
   295			return -EINVAL;
   296		}
   297		result = val;
   298		pr_info("set_dyndbg: result:0x%lx from %s\n", result, instr);
   299	
   300		changes = result ^ old_val;
   301	
   302		for_each_set_bit(bitpos, &changes, NUM_CLASSES) {
   303	
   304			sprintf(query, "format='^%s' %cp", pr_debug_classes[bitpos],
   305				test_bit(bitpos, &result) ? '+' : '-');
   306	
 > 307			chgct = dynamic_debug_exec_queries(query, "i915");
   308			totct += chgct;
   309			pr_info("change ct:%d on format='%s'\n", chgct,
   310				pr_debug_classes[bitpos]);
   311		}
   312		old_val = result;
   313		pr_info("change ct:%d\n", totct);
   314		return 0;
   315	}
   316	static int param_get_dyndbg(char *buffer, const struct kernel_param *kp)
   317	{
   318		return scnprintf(buffer, PAGE_SIZE, "%u\n",
   319				 *((unsigned int *)kp->arg));
   320	}
   321	static const struct kernel_param_ops param_ops_dyndbg = {
   322		.set = param_set_dyndbg,
   323		.get = param_get_dyndbg,
   324	};
   325	

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

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 75315 bytes --]

[-- Attachment #3: Type: text/plain, Size: 160 bytes --]

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx