hi Greg, Jason, DRM-folk,
This patchset fixes the CONFIG_DRM_USE_DYNAMIC_DEBUG=y regression,
Fixes: bb2ff6c27bc9 ("drm: Disable dynamic debug as broken")
this is v8.
Its also here:
https://github.com/jimc/linux/tree/dd-classmap-fix-8a
v7 had at least 2 problems:
https://lore.kernel.org/lkml/[email protected]/
https://patchwork.freedesktop.org/series/125066/
1. missing __align(8) in METATDATA macro, giving too much placement
freedom to linker, caused weird segvs following non-ptr vals, but for
builtin modules only. found by lkp-test.
2. the main patch changed both the dyndbg API, and the drm/drivers.
This was a flag-day annoyance, and not practical. Fix by preserving
old API macro until "later", and splitting the patch and set into 2
sequential subsets. removal can wait.
What was broken ?
Booting a modular kernel with drm.debug=0x1ff, this enabled pr_debugs
only in drm itself, not the yet-to-be loaded driver + helpers. I had
tested with scripts doing lots of modprobes with dyndbg=<> options
permuting. I didn't notice that I didn't really test without them.
The deeper cause was my design error, a violation of the K&R rule:
"define once, refer many times".
DECLARE_DYNDBG_CLASSMAP defined the classmap, and was used everywhere,
re-declaring the same static classmap repeatedly. Jani Nikula actually
picked up on this at the time, but didn't scream loudly enough for
anyone to notice, I know I didn't get it then. One patchset across 2
trees didn't help either.
The revised classmap API "splits" it to def & ref.
DYNDBG_CLASSMAP_DEFINE fixes & updates the busted macro, EXPORTing the
classmap instead. It gets invoked once per subsystem, by the
parent/builtin, drm.ko for DRM.
DYNDBG_CLASSMAP_USE in drivers and helpers refer to the classmap by
name, which links the 2 modules (like __drm_debug already does).
These 2 tell dyndbg to map "class FOO" to the defined FOO_ID, which
allows it to make those changes via >control.
DYNDBG_CLASSMAP_PARAM*, defines the controlling kparam, and binds it
to both the _var, and the _DEFINEd classmap. So drm uses this to bind
the classmap to __drm_debug.
It provides the common control-point for the sub-system; it is applied
to the classmaps during modprobe of both _DEFINEr and USErs. It also
enforces the relative nature of LEVEL classmaps, ie V3>V2.
DECLARE_DYNDBG_CLASSMAP is preserved to decouple the DRM patches.
A new struct and elf section contain the _USEs; on modprobe, these are
scanned similarly to the _DEFINEs, but follow the references to their
defining modules, find the kparam wired to the classmap, and apply its
classmap settings to the USEr. This action is what V1 missed, which
is why drivers failed to enable debug during modprobe.
In order to recapitulate the regression scenario without involving
DRM, the patchset (v6 I think) adds test_dynamic_debug_submod, which
is a duplicate of its parent; _submod.c #defines _SUBMOD, and then
includes parent.
This puts _DEFINE and _USE close together in the same file, for
obviousness. It also guarantees that the submod always has the same
complement of debug()s, giving consistent output from both when
classmaps are working properly, as tested when changing callsites via
both param and >control.
To provide a turn-key selftest, the patchset also adds
/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh, pilfered
from a debug-to-trace patchset I and Lukasz Bartozik have been working
out. It starts with basic_tests, then to test 2 new parsing
delimiters, which simplify testing of the classmap functionality.
It works nicely from virtme-ng:
[jimc@frodo vx]$ vrun_ -- ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
doing: vng --verbose --name v6.9-rc5-34-g2f1ace6e1c68 \
--user root --cwd ../.. \
-a dynamic_debug.verbose=2 -p 4 \
-- ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
virtme: waiting for virtiofsd to start
..
[ 3.546739] ip (260) used greatest stack depth: 12368 bytes left
[ 3.609288] virtme-init: starting script
test_dynamic_debug_submod not there
test_dynamic_debug not there
# BASIC_TESTS
..
# Done on: Fri Apr 26 20:45:08 MDT 2024
[ 4.765751] virtme-init: script returned {0}
Powering off.
[ 4.805790] ACPI: PM: Preparing to enter system sleep state S5
[ 4.806223] kvm: exiting hardware virtualization
[ 4.806564] reboot: Power down
[jimc@frodo vx]$
I've been running the kernel on my x86 desktop & laptop, booting with
drm.debug=0x1f, then turning it all-off after sleep 15.
a few highlights from a bare-metal boot:
here modprobe amdgpu; dyndbg applies last bit/class/category, and finishes init,
then drm and amdgpu start logging as they execute
..
[ 9.019696] gandalf kernel: dyndbg: query 0: "class DRM_UT_ATOMIC +p" mod:amdgpu
[ 9.019704] gandalf kernel: dyndbg: class-ref: amdgpu.DRM_UT_ATOMIC module:amdgpu nd:4754 nc:0 nu:1
[ 9.020012] gandalf kernel: dyndbg: processed 1 queries, with 21 matches, 0 errs
[ 9.020017] gandalf kernel: dyndbg: bit_4: 21 matches on class: DRM_UT_ATOMIC -> 0x1f
[ 9.020021] gandalf kernel: dyndbg: applied bitmap: 0x1f to: 0x0 for amdgpu
[ 9.020026] gandalf kernel: dyndbg: attach-client-module: module:amdgpu nd:4754 nc:0 nu:1
[ 9.020031] gandalf kernel: dyndbg: 4754 debug prints in module amdgpu
[ 9.055065] gandalf kernel: [drm] amdgpu kernel modesetting enabled.
[ 9.055138] gandalf kernel: [drm:amdgpu_acpi_detect [amdgpu]] No matching acpi device found for AMD3000
[ 9.055564] gandalf kernel: amdgpu: Virtual CRAT table created for CPU
[ 9.055585] gandalf kernel: amdgpu: Topology: Add CPU node
[ 9.055752] gandalf kernel: amdgpu 0000:0c:00.0: enabling device (0006 -> 0007)
[ 9.055821] gandalf kernel: [drm] initializing kernel modesetting (NAVI10 0x1002:0x731F 0x148C:0x2398 0xC1).
[ 9.055835] gandalf kernel: [drm] register mmio base: 0xFCB00000
[ 9.055839] gandalf kernel: [drm] register mmio size: 524288
[ 9.059148] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] number of dies: 1
[ 9.059387] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] number of hardware IPs on die0: 39
[ 9.059623] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] ATHUB(35) #0 v2.0.0:
[ 9.059856] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] 0x00000c00
[ 9.060096] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] 0x02408c00
[ 9.060328] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] set register base offset for ATHUB
a startup script, after sleep 15, turns off the logging:
echo 0 > /sys/module/drm/parameters/debug
heres 1st 2 bits/classes/categories being turned off:
[ 29.105991] gandalf kernel: [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 90752, wptr 90784
[ 29.118086] gandalf kernel: dyndbg: bits:0x0 > *.debug
[ 29.118096] gandalf kernel: dyndbg: apply bitmap: 0x0 to: 0x1f for '*'
[ 29.118102] gandalf kernel: dyndbg: query 0: "class DRM_UT_CORE -p" mod:*
[ 29.118122] gandalf kernel: dyndbg: good-class: drm.DRM_UT_CORE module:drm nd:338 nc:1 nu:0
[ 29.119548] gandalf kernel: dyndbg: class-ref: drm_kms_helper.DRM_UT_CORE module:drm_kms_helper nd:93
nc:0 nu:1
[ 29.119552] gandalf kernel: dyndbg: class-ref: drm_display_helper.DRM_UT_CORE module:drm_display_helper nd:151 nc:0 nu:1
[ 29.119737] gandalf kernel: dyndbg: class-ref: amdgpu.DRM_UT_CORE module:amdgpu nd:4754 nc:0 nu:1
[ 29.122181] gandalf kernel: [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 90784, wptr 90816
[ 29.127687] gandalf kernel: dyndbg: processed 1 queries, with 466 matches, 0 errs
[ 29.127690] gandalf kernel: dyndbg: bit_0: 466 matches on class: DRM_UT_CORE -> 0x0
[ 29.127692] gandalf kernel: dyndbg: query 0: "class DRM_UT_DRIVER -p" mod:*
[ 29.127696] gandalf kernel: dyndbg: good-class: drm.DRM_UT_DRIVER module:drm nd:338 nc:1 nu:0
[ 29.127699] gandalf kernel: dyndbg: class-ref: drm_kms_helper.DRM_UT_DRIVER module:drm_kms_helper nd:93 nc:0 nu:1
[ 29.127701] gandalf kernel: dyndbg: class-ref: drm_display_helper.DRM_UT_DRIVER module:drm_display_helper nd:151 nc:0 nu:1
[ 29.127885] gandalf kernel: dyndbg: class-ref: amdgpu.DRM_UT_DRIVER module:amdgpu nd:4754 nc:0 nu:1
[ 29.152925] gandalf kernel: dyndbg: processed 1 queries, with 1384 matches, 0 errs
The resulting journal is ~14.6k lines, written in the 1st 15 (29)
seconds of startup. I'm unsure what the 15/29 discrepancy might
indicate/betray, besides a lot of logging work. sleep 15 is not the
best stopwatch.
recent spins thru lkp-test have also been SUCCESS-ful.
Jim Cromie (35):
old-bugs & cleanups:
dyndbg: fix old BUG_ON in >control parser
docs/dyndbg: update examples \012 to \n
test-dyndbg: fixup CLASSMAP usage error
dyndbg: reword "class unknown," to "class:_UNKNOWN_"
dyndbg: make ddebug_class_param union members same size
dyndbg: replace classmap list with a vector
dyndbg: ddebug_apply_class_bitmap - add module arg, select on it
dyndbg: split param_set_dyndbg_classes to _module & wrapper fns
dyndbg: drop NUM_TYPE_ARRAY
dyndbg: reduce verbose/debug clutter
dyndbg: silence debugs with no-change updates
dyndbg: tighten ddebug_class_name() 1st arg type
dyndbg: tighten fn-sig of ddebug_apply_class_bitmap
dyndbg: reduce verbose=3 messages in ddebug_add_module
dyndbg-API: remove DD_CLASS_TYPE_(DISJOINT|LEVEL)_NAMES and code
core fix & selftests:
dyndbg-API: fix DECLARE_DYNDBG_CLASSMAP
selftests-dyndbg: add tools/testing/selftests/dynamic_debug/*
selftests-dyndbg: exit 127 if no facility
dyndbg-API: promote DYNDBG_CLASSMAP_PARAM to API
dyndbg-doc: add classmap info to howto
dyndbg: treat comma as a token separator
selftests-dyndbg: add comma_terminator_tests
dyndbg: split multi-query strings with %
selftests-dyndbg: test_percent_splitting multi-cmds on module classes
docs/dyndbg: explain new delimiters: comma, percent
selftests-dyndbg: add test_mod_submod
selftests-dyndbg: test dyndbg-to-tracefs
dyndbg-doc: explain flags parse 1st
dyndbg: add __counted_by annotations
DRM parts
drm+drivers: adapt to use DYNDBG_CLASSMAP_{DEFINE,USE}
drm-dyndbg: adapt to use DYNDBG_CLASSMAP_PARAM
drm: use correct ccflags-y spelling
drm-drivers: DRM_CLASSMAP_USE in 2nd batch of drivers, helpers
drm: restore CONFIG_DRM_USE_DYNAMIC_DEBUG un-BROKEN
drm-print: workaround compiler meh
.../admin-guide/dynamic-debug-howto.rst | 99 ++-
MAINTAINERS | 3 +-
drivers/gpu/drm/Kconfig | 3 +-
drivers/gpu/drm/Makefile | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 12 +-
drivers/gpu/drm/display/drm_dp_helper.c | 12 +-
drivers/gpu/drm/drm_crtc_helper.c | 12 +-
drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +
drivers/gpu/drm/drm_print.c | 38 +-
drivers/gpu/drm/gud/gud_drv.c | 2 +
drivers/gpu/drm/i915/i915_params.c | 12 +-
drivers/gpu/drm/mgag200/mgag200_drv.c | 2 +
drivers/gpu/drm/nouveau/nouveau_drm.c | 12 +-
drivers/gpu/drm/qxl/qxl_drv.c | 2 +
drivers/gpu/drm/radeon/radeon_drv.c | 2 +
drivers/gpu/drm/udl/udl_main.c | 2 +
drivers/gpu/drm/vkms/vkms_drv.c | 2 +
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 2 +
include/asm-generic/vmlinux.lds.h | 1 +
include/drm/drm_print.h | 10 +
include/linux/dynamic_debug.h | 130 ++-
kernel/module/main.c | 3 +
lib/Kconfig.debug | 24 +-
lib/Makefile | 3 +
lib/dynamic_debug.c | 443 ++++++----
lib/test_dynamic_debug.c | 131 +--
lib/test_dynamic_debug_submod.c | 17 +
tools/testing/selftests/Makefile | 1 +
.../testing/selftests/dynamic_debug/Makefile | 9 +
tools/testing/selftests/dynamic_debug/config | 2 +
.../dynamic_debug/dyndbg_selftest.sh | 765 ++++++++++++++++++
31 files changed, 1398 insertions(+), 363 deletions(-)
create mode 100644 lib/test_dynamic_debug_submod.c
create mode 100644 tools/testing/selftests/dynamic_debug/Makefile
create mode 100644 tools/testing/selftests/dynamic_debug/config
create mode 100755 tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
--
2.44.0
commit 47ea6f99d06e ("dyndbg: use ESCAPE_SPACE for cat control")
changed the control-file to display format strings with "\n" rather
than "\012". Update the docs to match the new reality.
Signed-off-by: Jim Cromie <[email protected]>
---
Documentation/admin-guide/dynamic-debug-howto.rst | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index 0e9b48daf690..6a8ce5a34382 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -52,12 +52,12 @@ query/commands to the control file. Example::
# grease the interface
:#> alias ddcmd='echo $* > /proc/dynamic_debug/control'
- :#> ddcmd '-p; module main func run* +p'
+ :#> ddcmd '-p; module main func run* +p' # disable all, then enable main
:#> grep =p /proc/dynamic_debug/control
- init/main.c:1424 [main]run_init_process =p " with arguments:\012"
- init/main.c:1426 [main]run_init_process =p " %s\012"
- init/main.c:1427 [main]run_init_process =p " with environment:\012"
- init/main.c:1429 [main]run_init_process =p " %s\012"
+ init/main.c:1424 [main]run_init_process =p " with arguments:\n"
+ init/main.c:1426 [main]run_init_process =p " %s\n"
+ init/main.c:1427 [main]run_init_process =p " with environment:\n"
+ init/main.c:1429 [main]run_init_process =p " %s\n"
Error messages go to console/syslog::
--
2.44.0
Fix a BUG_ON from 2009. Even if it looks "unreachable" (I didn't
really look), lets make sure by removing it, doing pr_err and return
-EINVAL instead.
cc: [email protected]
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index c78f335fa981..f2c5e7910bb1 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -302,7 +302,11 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
} else {
for (end = buf; *end && !isspace(*end); end++)
;
- BUG_ON(end == buf);
+ if (end == buf) {
+ pr_err("parse err after word:%d=%s\n", nwords,
+ nwords ? words[nwords - 1] : "<none>");
+ return -EINVAL;
+ }
}
/* `buf' is start of word, `end' is one past its end */
--
2.44.0
A more careful reading of logging output from test_dynamic_debug.ko
reveals:
lib/test_dynamic_debug.c:103 [test_dynamic_debug]do_cats =pmf "doing categories\n"
lib/test_dynamic_debug.c:105 [test_dynamic_debug]do_cats =p "LOW msg\n" class:MID
lib/test_dynamic_debug.c:106 [test_dynamic_debug]do_cats =p "MID msg\n" class:HI
lib/test_dynamic_debug.c:107 [test_dynamic_debug]do_cats =_ "HI msg\n" class unknown, _id:13
107 says: HI is unknown, 105,106 have LOW/MID and MID/HI skew.
The enum's 1st val (explicitly initialized) was wrong; it must be
_base, not _base+1 (a DECLARE_DYNDBG_CLASSMAP param). So the last
enumeration exceeded the range of mapped class-id's, which triggered
the "class unknown" report. I coded in an error, intending to verify
err detection, then forgot, and missed that it was there.
So this patch fixes a bad usage of DECLARE_DYNDBG_CLASSMAP(), showing
that it is too error-prone. As noted in test-mod comments:
* Using the CLASSMAP api:
* - classmaps must have corresponding enum
* - enum symbols must match/correlate with class-name strings in the map.
* - base must equal enum's 1st value
* - multiple maps must set their base to share the 0-62 class_id space !!
Signed-off-by: Jim Cromie <[email protected]>
---
lib/test_dynamic_debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c
index 8dd250ad022b..a01f0193a419 100644
--- a/lib/test_dynamic_debug.c
+++ b/lib/test_dynamic_debug.c
@@ -75,7 +75,7 @@ DD_SYS_WRAP(disjoint_bits, p);
DD_SYS_WRAP(disjoint_bits, T);
/* symbolic input, independent bits */
-enum cat_disjoint_names { LOW = 11, MID, HI };
+enum cat_disjoint_names { LOW = 10, MID, HI };
DECLARE_DYNDBG_CLASSMAP(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10,
"LOW", "MID", "HI");
DD_SYS_WRAP(disjoint_names, p);
--
2.44.0
When a dyndbg classname is unknown to a kernel module (as before
previous patch), the callsite is un-addressable via >control queries.
The control-file displays this condition as "class unknown,"
currently. That spelling is sub-optimal, so change it to
"class:_UNKNOWN_" to loudly announce the erroneous situation, and to
make it exceedingly greppable.
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index f2c5e7910bb1..73ccf947d4aa 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1154,7 +1154,7 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
if (class)
seq_printf(m, " class:%s", class);
else
- seq_printf(m, " class unknown, _id:%d", dp->class_id);
+ seq_printf(m, " class:_UNKNOWN_ _id:%d", dp->class_id);
}
seq_puts(m, "\n");
--
2.44.0
Add param: query_module to ddebug_apply_class_bitmap(), and pass it
thru to _ddebug_queries(), replacing NULL with query_module. This
allows its caller to update just one module, or all (as currently).
We'll use this later to propagate drm.debug to each USEr as they're
modprobed.
No functional change.
Signed-off-by: Jim Cromie <[email protected]>
---
after `modprobe i915`, heres the module dependencies,
though not all on drm.debug.
bash-5.2# lsmod
Module Size Used by
i915 3133440 0
drm_buddy 20480 1 i915
ttm 90112 1 i915
i2c_algo_bit 16384 1 i915
video 61440 1 i915
wmi 32768 1 video
drm_display_helper 200704 1 i915
drm_kms_helper 208896 2 drm_display_helper,i915
drm 606208 5 drm_kms_helper,drm_display_helper,drm_buddy,i915,ttm
cec 57344 2 drm_display_helper,i915
---
lib/dynamic_debug.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 46e4cdd8e6be..a1fd2e9dbafb 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -605,7 +605,8 @@ static int ddebug_exec_queries(char *query, const char *modname)
/* apply a new bitmap to the sys-knob's current bit-state */
static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
- unsigned long *new_bits, unsigned long *old_bits)
+ unsigned long *new_bits, unsigned long *old_bits,
+ const char *query_modname)
{
#define QUERY_SIZE 128
char query[QUERY_SIZE];
@@ -613,7 +614,8 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
int matches = 0;
int bi, ct;
- v2pr_info("apply: 0x%lx to: 0x%lx\n", *new_bits, *old_bits);
+ v2pr_info("apply bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits, *old_bits,
+ query_modname ?: "");
for (bi = 0; bi < map->length; bi++) {
if (test_bit(bi, new_bits) == test_bit(bi, old_bits))
@@ -622,12 +624,15 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
snprintf(query, QUERY_SIZE, "class %s %c%s", map->class_names[bi],
test_bit(bi, new_bits) ? '+' : '-', dcp->flags);
- ct = ddebug_exec_queries(query, NULL);
+ ct = ddebug_exec_queries(query, query_modname);
matches += ct;
v2pr_info("bit_%d: %d matches on class: %s -> 0x%lx\n", bi,
ct, map->class_names[bi], *new_bits);
}
+ v2pr_info("applied bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits, *old_bits,
+ query_modname ?: "");
+
return matches;
}
@@ -682,7 +687,7 @@ static int param_set_dyndbg_classnames(const char *instr, const struct kernel_pa
continue;
}
curr_bits ^= BIT(cls_id);
- totct += ddebug_apply_class_bitmap(dcp, &curr_bits, dcp->bits);
+ totct += ddebug_apply_class_bitmap(dcp, &curr_bits, dcp->bits, NULL);
*dcp->bits = curr_bits;
v2pr_info("%s: changed bit %d:%s\n", KP_NAME(kp), cls_id,
map->class_names[cls_id]);
@@ -692,7 +697,7 @@ static int param_set_dyndbg_classnames(const char *instr, const struct kernel_pa
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
curr_bits = CLASSMAP_BITMASK(cls_id + (wanted ? 1 : 0 ));
- totct += ddebug_apply_class_bitmap(dcp, &curr_bits, &old_bits);
+ totct += ddebug_apply_class_bitmap(dcp, &curr_bits, &old_bits, NULL);
*dcp->lvl = (cls_id + (wanted ? 1 : 0));
v2pr_info("%s: changed bit-%d: \"%s\" %lx->%lx\n", KP_NAME(kp), cls_id,
map->class_names[cls_id], old_bits, curr_bits);
@@ -755,7 +760,7 @@ int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
inrep &= CLASSMAP_BITMASK(map->length);
}
v2pr_info("bits:%lx > %s\n", inrep, KP_NAME(kp));
- totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits);
+ totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits, NULL);
*dcp->bits = inrep;
break;
case DD_CLASS_TYPE_LEVEL_NUM:
@@ -768,7 +773,7 @@ int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
new_bits = CLASSMAP_BITMASK(inrep);
v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp));
- totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits);
+ totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits, NULL);
*dcp->lvl = inrep;
break;
default:
--
2.44.0
struct ddebug_class_param keeps a ref to the state-storage of the
param; make both class-types use the same unsigned long storage type.
ISTM this is simpler and safer.
Signed-off-by: Jim Cromie <[email protected]>
---
include/linux/dynamic_debug.h | 2 +-
lib/dynamic_debug.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 4fcbf4d4fd0a..5231aaf361c4 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -124,7 +124,7 @@ struct _ddebug_info {
struct ddebug_class_param {
union {
unsigned long *bits;
- unsigned int *lvl;
+ unsigned long *lvl;
};
char flags[8];
const struct ddebug_class_map *map;
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 73ccf947d4aa..152b04c05981 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -799,7 +799,7 @@ int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp)
case DD_CLASS_TYPE_LEVEL_NAMES:
case DD_CLASS_TYPE_LEVEL_NUM:
- return scnprintf(buffer, PAGE_SIZE, "%d\n", *dcp->lvl);
+ return scnprintf(buffer, PAGE_SIZE, "%ld\n", *dcp->lvl);
default:
return -1;
}
--
2.44.0
Split api-fn: param_set_dyndbg_classes(), adding modname param and
passing NULL in from api-fn.
The new arg allows caller to specify that only one module is affected
by a prdbgs update. This selectivity will be used later to narrow the
scope of changes made.
no functional change.
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 37 ++++++++++++++++++++++---------------
1 file changed, 22 insertions(+), 15 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index a1fd2e9dbafb..4a48f830507f 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -711,18 +711,9 @@ static int param_set_dyndbg_classnames(const char *instr, const struct kernel_pa
return 0;
}
-/**
- * param_set_dyndbg_classes - class FOO >control
- * @instr: string echo>d to sysfs, input depends on map_type
- * @kp: kp->arg has state: bits/lvl, map, map_type
- *
- * Enable/disable prdbgs by their class, as given in the arguments to
- * DECLARE_DYNDBG_CLASSMAP. For LEVEL map-types, enforce relative
- * levels by bitpos.
- *
- * Returns: 0 or <0 if error.
- */
-int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
+static int param_set_dyndbg_module_classes(const char *instr,
+ const struct kernel_param *kp,
+ const char *modnm)
{
const struct ddebug_class_param *dcp = kp->arg;
const struct ddebug_class_map *map = dcp->map;
@@ -759,8 +750,8 @@ int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
KP_NAME(kp), inrep, CLASSMAP_BITMASK(map->length));
inrep &= CLASSMAP_BITMASK(map->length);
}
- v2pr_info("bits:%lx > %s\n", inrep, KP_NAME(kp));
- totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits, NULL);
+ v2pr_info("bits:0x%lx > %s.%s\n", inrep, modnm ?: "*", KP_NAME(kp));
+ totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits, modnm);
*dcp->bits = inrep;
break;
case DD_CLASS_TYPE_LEVEL_NUM:
@@ -773,7 +764,7 @@ int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
new_bits = CLASSMAP_BITMASK(inrep);
v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp));
- totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits, NULL);
+ totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits, modnm);
*dcp->lvl = inrep;
break;
default:
@@ -782,6 +773,22 @@ int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
vpr_info("%s: total matches: %d\n", KP_NAME(kp), totct);
return 0;
}
+
+/**
+ * param_set_dyndbg_classes - class FOO >control
+ * @instr: string echo>d to sysfs, input depends on map_type
+ * @kp: kp->arg has state: bits/lvl, map, map_type
+ *
+ * Enable/disable prdbgs by their class, as given in the arguments to
+ * DECLARE_DYNDBG_CLASSMAP. For LEVEL map-types, enforce relative
+ * levels by bitpos.
+ *
+ * Returns: 0 or <0 if error.
+ */
+int param_set_dyndbg_classes(const char *instr, const struct kernel_param *kp)
+{
+ return param_set_dyndbg_module_classes(instr, kp, NULL);
+}
EXPORT_SYMBOL(param_set_dyndbg_classes);
/**
--
2.44.0
currently, for verbose=3, these are logged (blank lines for clarity):
dyndbg: query 0: "class DRM_UT_CORE +p" mod:*
dyndbg: split into words: "class" "DRM_UT_CORE" "+p"
dyndbg: op='+'
dyndbg: flags=0x1
dyndbg: *flagsp=0x1 *maskp=0xffffffff
dyndbg: parsed: func="" file="" module="" format="" lineno=0-0 class=...
dyndbg: no matches for query
dyndbg: no-match: func="" file="" module="" format="" lineno=0-0 class=...
dyndbg: processed 1 queries, with 0 matches, 0 errs
That is excessive, so this patch:
- shrinks 3 lines of 2nd stanza to single line
- drops 1st 2 lines of 3rd stanza
3rd line is like 1st, with result, not procedure.
2nd line is just status, retold in 4th, with more info.
New output:
dyndbg: query 0: "class DRM_UT_CORE +p" mod:*
dyndbg: split into words: "class" "DRM_UT_CORE" "+p"
dyndbg: op='+' flags=0x1 *flagsp=0x1 *maskp=0xffffffff
dyndbg: no-match: func="" file="" module="" format="" lineno=0-0 class=...
dyndbg: processed 1 queries, with 0 matches, 0 errs
no functional change.
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 4a48f830507f..368381dbd266 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -266,9 +266,6 @@ static int ddebug_change(const struct ddebug_query *query,
}
mutex_unlock(&ddebug_lock);
- if (!nfound && verbose)
- pr_info("no matches for query\n");
-
return nfound;
}
@@ -501,7 +498,6 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
pr_err("bad flag-op %c, at start of %s\n", *str, str);
return -EINVAL;
}
- v3pr_info("op='%c'\n", op);
for (; *str ; ++str) {
for (i = ARRAY_SIZE(opt_array) - 1; i >= 0; i--) {
@@ -515,7 +511,6 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
return -EINVAL;
}
}
- v3pr_info("flags=0x%x\n", modifiers->flags);
/* calculate final flags, mask based upon op */
switch (op) {
@@ -531,7 +526,7 @@ static int ddebug_parse_flags(const char *str, struct flag_settings *modifiers)
modifiers->flags = 0;
break;
}
- v3pr_info("*flagsp=0x%x *maskp=0x%x\n", modifiers->flags, modifiers->mask);
+ v3pr_info("op='%c' flags=0x%x maskp=0x%x\n", op, modifiers->flags, modifiers->mask);
return 0;
}
@@ -541,7 +536,7 @@ static int ddebug_exec_query(char *query_string, const char *modname)
struct flag_settings modifiers = {};
struct ddebug_query query = {};
#define MAXWORDS 9
- int nwords, nfound;
+ int nwords;
char *words[MAXWORDS];
nwords = ddebug_tokenize(query_string, words, MAXWORDS);
@@ -559,10 +554,7 @@ static int ddebug_exec_query(char *query_string, const char *modname)
return -EINVAL;
}
/* actually go and implement the change */
- nfound = ddebug_change(&query, &modifiers);
- vpr_info_dq(&query, nfound ? "applied" : "no-match");
-
- return nfound;
+ return ddebug_change(&query, &modifiers);
}
/* handle multiple queries in query string, continue on error, return
--
2.44.0
ARRAY_SIZE works here, since array decl is complete.
no functional change
Signed-off-by: Jim Cromie <[email protected]>
---
include/linux/dynamic_debug.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index b53217e4b711..8116d0a0d33a 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -106,11 +106,9 @@ struct ddebug_class_map {
.mod_name = KBUILD_MODNAME, \
.base = _base, \
.map_type = _maptype, \
- .length = NUM_TYPE_ARGS(char*, __VA_ARGS__), \
+ .length = ARRAY_SIZE(_var##_classnames), \
.class_names = _var##_classnames, \
}
-#define NUM_TYPE_ARGS(eltype, ...) \
- (sizeof((eltype[]){__VA_ARGS__}) / sizeof(eltype))
/* encapsulate linker provided built-in (or module) dyndbg data */
struct _ddebug_info {
--
2.44.0
In ddebug_apply_class_bitmap(), check for actual changes to the bits
before announcing them, to declutter logs.
no functional change.
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 368381dbd266..8320cadeb251 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -595,7 +595,7 @@ static int ddebug_exec_queries(char *query, const char *modname)
return nfound;
}
-/* apply a new bitmap to the sys-knob's current bit-state */
+/* apply a new class-param setting */
static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
unsigned long *new_bits, unsigned long *old_bits,
const char *query_modname)
@@ -606,8 +606,9 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
int matches = 0;
int bi, ct;
- v2pr_info("apply bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits, *old_bits,
- query_modname ?: "");
+ if (*new_bits != *old_bits)
+ v2pr_info("apply bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits,
+ *old_bits, query_modname ?: "'*'");
for (bi = 0; bi < map->length; bi++) {
if (test_bit(bi, new_bits) == test_bit(bi, old_bits))
@@ -622,8 +623,9 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
v2pr_info("bit_%d: %d matches on class: %s -> 0x%lx\n", bi,
ct, map->class_names[bi], *new_bits);
}
- v2pr_info("applied bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits, *old_bits,
- query_modname ?: "");
+ if (*new_bits != *old_bits)
+ v2pr_info("applied bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits,
+ *old_bits, query_modname ?: "'*'");
return matches;
}
--
2.44.0
Classmaps are stored in an elf section/array, but are individually
list-linked onto dyndbg's per-module ddebug_table for operation.
This is unnecessary; even when ddebug_attach_classmap() is handling
the builtin section (with classmaps for multiple builtin modules), its
contents are ordered, so a module's possibly multiple classmaps will
be consecutive in the section, and could be treated as a vector/block,
since both start-addy and subrange length are in the ddebug_info arg.
IOW, this treats classmaps similarly to _ddebugs, which are already
kept as vector-refs (address+len).
So this changes:
struct ddebug_class_map drops list-head link.
struct ddebug_table drops the list-head maps, and gets: classes &
num_classes for the start-addy and num_classes, placed to improve
struct packing.
The loading: in ddebug_attach_module_classes(), replace the
for-the-modname list-add loop, with a forloop that finds the module's
subrange (start,length) of matching classmaps within the possibly
builtin classmaps vector, and saves those to the ddebug_table.
The reading/using: change list-foreach loops in ddebug_class_name() &
ddebug_find_valid_class() to walk the array from start to length.
Also:
Move #define __outvar up, above an added use in a fn-prototype.
Simplify ddebug_attach_module_classes args, ref has both addy,len.
no functional changes
Signed-off-by: Jim Cromie <[email protected]>
---
include/linux/dynamic_debug.h | 1 -
lib/dynamic_debug.c | 61 ++++++++++++++++++-----------------
2 files changed, 32 insertions(+), 30 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 5231aaf361c4..b53217e4b711 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -83,7 +83,6 @@ enum class_map_type {
};
struct ddebug_class_map {
- struct list_head link;
struct module *mod;
const char *mod_name; /* needed for builtins */
const char **class_names;
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 152b04c05981..46e4cdd8e6be 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -45,10 +45,11 @@ extern struct ddebug_class_map __start___dyndbg_classes[];
extern struct ddebug_class_map __stop___dyndbg_classes[];
struct ddebug_table {
- struct list_head link, maps;
+ struct list_head link;
const char *mod_name;
- unsigned int num_ddebugs;
struct _ddebug *ddebugs;
+ struct ddebug_class_map *classes;
+ unsigned int num_ddebugs, num_classes;
};
struct ddebug_query {
@@ -147,13 +148,15 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
query->first_lineno, query->last_lineno, query->class_string);
}
+#define __outvar /* filled by callee */
static struct ddebug_class_map *ddebug_find_valid_class(struct ddebug_table const *dt,
- const char *class_string, int *class_id)
+ const char *class_string,
+ __outvar int *class_id)
{
struct ddebug_class_map *map;
- int idx;
+ int i, idx;
- list_for_each_entry(map, &dt->maps, link) {
+ for (map = dt->classes, i = 0; i < dt->num_classes; i++, map++) {
idx = match_string(map->class_names, map->length, class_string);
if (idx >= 0) {
*class_id = idx + map->base;
@@ -164,7 +167,6 @@ static struct ddebug_class_map *ddebug_find_valid_class(struct ddebug_table cons
return NULL;
}
-#define __outvar /* filled by callee */
/*
* Search the tables for _ddebug's which match the given `query' and
* apply the `flags' and `mask' to them. Returns number of matching
@@ -1114,9 +1116,10 @@ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
static const char *ddebug_class_name(struct ddebug_iter *iter, struct _ddebug *dp)
{
- struct ddebug_class_map *map;
+ struct ddebug_class_map *map = iter->table->classes;
+ int i, nc = iter->table->num_classes;
- list_for_each_entry(map, &iter->table->maps, link)
+ for (i = 0; i < nc; i++, map++)
if (class_in_range(dp->class_id, map))
return map->class_names[dp->class_id - map->base];
@@ -1200,30 +1203,31 @@ static const struct proc_ops proc_fops = {
.proc_write = ddebug_proc_write
};
-static void ddebug_attach_module_classes(struct ddebug_table *dt,
- struct ddebug_class_map *classes,
- int num_classes)
+static void ddebug_attach_module_classes(struct ddebug_table *dt, struct _ddebug_info *di)
{
struct ddebug_class_map *cm;
- int i, j, ct = 0;
+ int i, nc = 0;
- for (cm = classes, i = 0; i < num_classes; i++, cm++) {
+ /*
+ * Find this module's classmaps in a subrange/wholerange of
+ * the builtin/modular classmap vector/section. Save the start
+ * and length of the subrange at its edges.
+ */
+ for (cm = di->classes, i = 0; i < di->num_classes; i++, cm++) {
if (!strcmp(cm->mod_name, dt->mod_name)) {
-
- v2pr_info("class[%d]: module:%s base:%d len:%d ty:%d\n", i,
- cm->mod_name, cm->base, cm->length, cm->map_type);
-
- for (j = 0; j < cm->length; j++)
- v3pr_info(" %d: %d %s\n", j + cm->base, j,
- cm->class_names[j]);
-
- list_add(&cm->link, &dt->maps);
- ct++;
+ if (!nc) {
+ v2pr_info("start subrange, class[%d]: module:%s base:%d len:%d ty:%d\n",
+ i, cm->mod_name, cm->base, cm->length, cm->map_type);
+ dt->classes = cm;
+ }
+ nc++;
}
}
- if (ct)
- vpr_info("module:%s attached %d classes\n", dt->mod_name, ct);
+ if (nc) {
+ dt->num_classes = nc;
+ vpr_info("module:%s attached %d classes\n", dt->mod_name, nc);
+ }
}
/*
@@ -1256,10 +1260,9 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
dt->num_ddebugs = di->num_descs;
INIT_LIST_HEAD(&dt->link);
- INIT_LIST_HEAD(&dt->maps);
if (di->classes && di->num_classes)
- ddebug_attach_module_classes(dt, di->classes, di->num_classes);
+ ddebug_attach_module_classes(dt, di);
mutex_lock(&ddebug_lock);
list_add_tail(&dt->link, &ddebug_tables);
@@ -1372,8 +1375,8 @@ static void ddebug_remove_all_tables(void)
mutex_lock(&ddebug_lock);
while (!list_empty(&ddebug_tables)) {
struct ddebug_table *dt = list_entry(ddebug_tables.next,
- struct ddebug_table,
- link);
+ struct ddebug_table,
+ link);
ddebug_table_free(dt);
}
mutex_unlock(&ddebug_lock);
--
2.44.0
old_bits arg is currently a pointer to the input bits, but this could
allow inadvertent changes to the input by the fn. Disallow this.
And constify new_bits while here.
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 882354e1e78f..d4a0ae31d059 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -597,7 +597,8 @@ static int ddebug_exec_queries(char *query, const char *modname)
/* apply a new class-param setting */
static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
- unsigned long *new_bits, unsigned long *old_bits,
+ const unsigned long *new_bits,
+ const unsigned long old_bits,
const char *query_modname)
{
#define QUERY_SIZE 128
@@ -606,12 +607,12 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
int matches = 0;
int bi, ct;
- if (*new_bits != *old_bits)
+ if (*new_bits != old_bits)
v2pr_info("apply bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits,
- *old_bits, query_modname ?: "'*'");
+ old_bits, query_modname ?: "'*'");
for (bi = 0; bi < map->length; bi++) {
- if (test_bit(bi, new_bits) == test_bit(bi, old_bits))
+ if (test_bit(bi, new_bits) == test_bit(bi, &old_bits))
continue;
snprintf(query, QUERY_SIZE, "class %s %c%s", map->class_names[bi],
@@ -623,9 +624,9 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
v2pr_info("bit_%d: %d matches on class: %s -> 0x%lx\n", bi,
ct, map->class_names[bi], *new_bits);
}
- if (*new_bits != *old_bits)
+ if (*new_bits != old_bits)
v2pr_info("applied bitmap: 0x%lx to: 0x%lx for %s\n", *new_bits,
- *old_bits, query_modname ?: "'*'");
+ old_bits, query_modname ?: "'*'");
return matches;
}
@@ -681,7 +682,7 @@ static int param_set_dyndbg_classnames(const char *instr, const struct kernel_pa
continue;
}
curr_bits ^= BIT(cls_id);
- totct += ddebug_apply_class_bitmap(dcp, &curr_bits, dcp->bits, NULL);
+ totct += ddebug_apply_class_bitmap(dcp, &curr_bits, *dcp->bits, NULL);
*dcp->bits = curr_bits;
v2pr_info("%s: changed bit %d:%s\n", KP_NAME(kp), cls_id,
map->class_names[cls_id]);
@@ -691,7 +692,7 @@ static int param_set_dyndbg_classnames(const char *instr, const struct kernel_pa
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
curr_bits = CLASSMAP_BITMASK(cls_id + (wanted ? 1 : 0 ));
- totct += ddebug_apply_class_bitmap(dcp, &curr_bits, &old_bits, NULL);
+ totct += ddebug_apply_class_bitmap(dcp, &curr_bits, old_bits, NULL);
*dcp->lvl = (cls_id + (wanted ? 1 : 0));
v2pr_info("%s: changed bit-%d: \"%s\" %lx->%lx\n", KP_NAME(kp), cls_id,
map->class_names[cls_id], old_bits, curr_bits);
@@ -745,7 +746,7 @@ static int param_set_dyndbg_module_classes(const char *instr,
inrep &= CLASSMAP_BITMASK(map->length);
}
v2pr_info("bits:0x%lx > %s.%s\n", inrep, modnm ?: "*", KP_NAME(kp));
- totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits, modnm);
+ totct += ddebug_apply_class_bitmap(dcp, &inrep, *dcp->bits, modnm);
*dcp->bits = inrep;
break;
case DD_CLASS_TYPE_LEVEL_NUM:
@@ -758,7 +759,7 @@ static int param_set_dyndbg_module_classes(const char *instr,
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
new_bits = CLASSMAP_BITMASK(inrep);
v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp));
- totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits, modnm);
+ totct += ddebug_apply_class_bitmap(dcp, &new_bits, old_bits, modnm);
*dcp->lvl = inrep;
break;
default:
--
2.44.0
When modprobing a module, dyndbg currently logs/says "add-module", and
then "skipping" if the module has no prdbgs. Instead just check 1st
and return quietly.
no functional change
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index d4a0ae31d059..43a8e04b8599 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1245,11 +1245,10 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
{
struct ddebug_table *dt;
- v3pr_info("add-module: %s.%d sites\n", modname, di->num_descs);
- if (!di->num_descs) {
- v3pr_info(" skip %s\n", modname);
+ if (!di->num_descs)
return 0;
- }
+
+ v3pr_info("add-module: %s %d sites\n", modname, di->num_descs);
dt = kzalloc(sizeof(*dt), GFP_KERNEL);
if (dt == NULL) {
--
2.44.0
Test if /proc/dynamic_debug/control exists, exit 127 otherwise.
This distinguishes an untestable config from both pass & fail.
The 127 choice is pretty arbitrary, but imitating bisect.
That control file's presense guarantees that dynamic-debugging is
configured (unless /proc is off, unusually), without dealing with the
<debugfs> mount.
Signed-off-by: Jim Cromie <[email protected]>
---
tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
index 1be70af26a38..cb77ae142520 100755
--- a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -11,6 +11,11 @@ CYAN="\033[0;36m"
NC="\033[0;0m"
error_msg=""
+[ -e /proc/dynamic_debug/control ] || {
+ echo -e "${RED}: kernel not configured for this test ${NC}"
+ exit 127
+}
+
function vx () {
echo $1 > /sys/module/dynamic_debug/parameters/verbose
}
--
2.44.0
Change function's 1st arg-type, and deref in the caller.
The fn doesn't need any other fields in the struct.
no functional change.
Signed-off-by: Jim Cromie <[email protected]>
---
lib/dynamic_debug.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 8320cadeb251..882354e1e78f 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1120,12 +1120,12 @@ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
#define class_in_range(class_id, map) \
(class_id >= map->base && class_id < map->base + map->length)
-static const char *ddebug_class_name(struct ddebug_iter *iter, struct _ddebug *dp)
+static const char *ddebug_class_name(struct ddebug_table *dt, struct _ddebug *dp)
{
- struct ddebug_class_map *map = iter->table->classes;
- int i, nc = iter->table->num_classes;
+ struct ddebug_class_map *map = dt->classes;
+ int i;
- for (i = 0; i < nc; i++, map++)
+ for (i = 0; i < dt->num_classes; i++, map++)
if (class_in_range(dp->class_id, map))
return map->class_names[dp->class_id - map->base];
@@ -1159,7 +1159,7 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
seq_puts(m, "\"");
if (dp->class_id != _DPRINTK_CLASS_DFLT) {
- class = ddebug_class_name(iter, dp);
+ class = ddebug_class_name(iter->table, dp);
if (class)
seq_printf(m, " class:%s", class);
else
--
2.44.0
move the DYNDBG_CLASSMAP_PARAM macro from test-dynamic-debug.c into
the header, and refine it, by distinguishing the 2 use cases:
1.DYNDBG_CLASSMAP_PARAM_REF
for DRM, to pass in extern __drm_debug by name.
dyndbg keeps bits in it, so drm can still use it as before
2.DYNDBG_CLASSMAP_PARAM
new user (test_dynamic_debug) doesn't need to share state,
decls a static long unsigned int to store the bitvec.
__DYNDBG_CLASSMAP_PARAM
bottom layer - allocate,init a ddebug-class-param, module-param-cb.
Also clean up and improve comments in test-code, and add
MODULE_DESCRIPTIONs.
Signed-off-by: Jim Cromie <[email protected]>
---
fixup drm-print.h add PARAM_REF forwarding macros
with DYNDBG_CLASSMAP_PARAM_REF in the API, add DRM_ variant
---
include/linux/dynamic_debug.h | 37 ++++++++++++++++-
lib/dynamic_debug.c | 70 ++++++++++++++++++++++-----------
lib/test_dynamic_debug.c | 50 +++++++++--------------
lib/test_dynamic_debug_submod.c | 9 ++++-
4 files changed, 110 insertions(+), 56 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index d1fc3035e19c..090fe9554db7 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -91,7 +91,7 @@ struct ddebug_class_map {
* used to validate a "class FOO .." >control command on the module
*/
#define __DYNDBG_CLASSMAP_DEFINE(_var, _maptype, _base, ...) \
- const char *_var##_classnames[] = { __VA_ARGS__ }; \
+ static const char *_var##_classnames[] = { __VA_ARGS__ }; \
struct ddebug_class_map __aligned(8) __used \
__section("__dyndbg_classes") _var = { \
.mod = THIS_MODULE, \
@@ -163,6 +163,41 @@ struct ddebug_class_param {
const struct ddebug_class_map *map;
};
+/**
+ * DYNDBG_CLASSMAP_PARAM - wrap a dyndbg-classmap with a controlling sys-param
+ * @_name sysfs node name
+ * @_var name of the struct classmap var defining the controlled classes
+ * @_flags flags to be toggled, typically just 'p'
+ *
+ * Creates a sysfs-param to control the classes defined by the
+ * classmap. Keeps bits in a private/static
+ */
+#define DYNDBG_CLASSMAP_PARAM(_name, _var, _flags) \
+ static unsigned long _name##_bvec; \
+ __DYNDBG_CLASSMAP_PARAM(_name, _name##_bvec, _var, _flags)
+
+/**
+ * DYNDBG_CLASSMAP_PARAM_REF - wrap a dyndbg-classmap with a controlling sys-param
+ * @_name sysfs node name
+ * @_bits name of the module's unsigned long bit-vector, ex: __drm_debug
+ * @_var name of the struct classmap var defining the controlled classes
+ * @_flags flags to be toggled, typically just 'p'
+ *
+ * Creates a sysfs-param to control the classmap, keeping bitvec in user @_bits.
+ * This lets drm use __drm_debug elsewhere too.
+ */
+#define DYNDBG_CLASSMAP_PARAM_REF(_name, _bits, _var, _flags) \
+ __DYNDBG_CLASSMAP_PARAM(_name, _bits, _var, _flags)
+
+#define __DYNDBG_CLASSMAP_PARAM(_name, _bits, _var, _flags) \
+ static struct ddebug_class_param _name##_##_flags = { \
+ .bits = &(_bits), \
+ .flags = #_flags, \
+ .map = &(_var), \
+ }; \
+ module_param_cb(_name, ¶m_ops_dyndbg_classes, \
+ &_name##_##_flags, 0600)
+
/*
* pr_debug() and friends are globally enabled or modules have selectively
* enabled them.
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index f0a274a3cc9e..31fd67597928 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -657,6 +657,30 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
#define CLASSMAP_BITMASK(width) ((1UL << (width)) - 1)
+static void ddebug_class_param_clamp_input(unsigned long *inrep, const struct kernel_param *kp)
+{
+ const struct ddebug_class_param *dcp = kp->arg;
+ const struct ddebug_class_map *map = dcp->map;
+
+ switch (map->map_type) {
+ case DD_CLASS_TYPE_DISJOINT_BITS:
+ /* expect bits. mask and warn if too many */
+ if (*inrep & ~CLASSMAP_BITMASK(map->length)) {
+ pr_warn("%s: input: 0x%lx exceeds mask: 0x%lx, masking\n",
+ KP_NAME(kp), *inrep, CLASSMAP_BITMASK(map->length));
+ *inrep &= CLASSMAP_BITMASK(map->length);
+ }
+ break;
+ case DD_CLASS_TYPE_LEVEL_NUM:
+ /* input is bitpos, of highest verbosity to be enabled */
+ if (*inrep > map->length) {
+ pr_warn("%s: level:%ld exceeds max:%d, clamping\n",
+ KP_NAME(kp), *inrep, map->length);
+ *inrep = map->length;
+ }
+ break;
+ }
+}
static int param_set_dyndbg_module_classes(const char *instr,
const struct kernel_param *kp,
const char *modnm)
@@ -675,26 +699,15 @@ static int param_set_dyndbg_module_classes(const char *instr,
pr_err("expecting numeric input, not: %s > %s\n", instr, KP_NAME(kp));
return -EINVAL;
}
+ ddebug_class_param_clamp_input(&inrep, kp);
switch (map->map_type) {
case DD_CLASS_TYPE_DISJOINT_BITS:
- /* expect bits. mask and warn if too many */
- if (inrep & ~CLASSMAP_BITMASK(map->length)) {
- pr_warn("%s: input: 0x%lx exceeds mask: 0x%lx, masking\n",
- KP_NAME(kp), inrep, CLASSMAP_BITMASK(map->length));
- inrep &= CLASSMAP_BITMASK(map->length);
- }
v2pr_info("bits:0x%lx > %s.%s\n", inrep, modnm ?: "*", KP_NAME(kp));
totct += ddebug_apply_class_bitmap(dcp, &inrep, *dcp->bits, modnm);
*dcp->bits = inrep;
break;
case DD_CLASS_TYPE_LEVEL_NUM:
- /* input is bitpos, of highest verbosity to be enabled */
- if (inrep > map->length) {
- pr_warn("%s: level:%ld exceeds max:%d, clamping\n",
- KP_NAME(kp), inrep, map->length);
- inrep = map->length;
- }
old_bits = CLASSMAP_BITMASK(*dcp->lvl);
new_bits = CLASSMAP_BITMASK(inrep);
v2pr_info("lvl:%ld bits:0x%lx > %s\n", inrep, new_bits, KP_NAME(kp));
@@ -1161,16 +1174,27 @@ static const char * const ddebug_classmap_typenames[] = {
ddebug_classmap_typenames[_cm->map_type]); \
})
-static void ddebug_sync_classbits(const struct ddebug_class_param *dcp, const char *modname)
+static void ddebug_sync_classbits(const struct kernel_param *kp, const char *modname)
{
- /* clamp initial bitvec, mask off hi-bits */
- if (*dcp->bits & ~CLASSMAP_BITMASK(dcp->map->length)) {
- *dcp->bits &= CLASSMAP_BITMASK(dcp->map->length);
- v2pr_info("preset classbits: %lx\n", *dcp->bits);
+ struct ddebug_class_param *dcp = kp->arg;
+ unsigned long new_bits;
+
+ ddebug_class_param_clamp_input(dcp->bits, kp);
+
+ switch (dcp->map->map_type) {
+ case DD_CLASS_TYPE_DISJOINT_BITS:
+ v2pr_info(" %s: classbits: 0x%lx\n", KP_NAME(kp), *dcp->bits);
+ ddebug_apply_class_bitmap(dcp, dcp->bits, 0UL, modname);
+ break;
+ case DD_CLASS_TYPE_LEVEL_NUM:
+ new_bits = CLASSMAP_BITMASK(*dcp->lvl);
+ v2pr_info(" %s: lvl:%ld bits:0x%lx\n", KP_NAME(kp), *dcp->lvl, new_bits);
+ ddebug_apply_class_bitmap(dcp, &new_bits, 0UL, modname);
+ break;
+ default:
+ pr_err("bad map type %d\n", dcp->map->map_type);
+ return;
}
- /* force class'd prdbgs (in USEr module) to match (DEFINEr module) class-param */
- ddebug_apply_class_bitmap(dcp, dcp->bits, ~0, modname);
- ddebug_apply_class_bitmap(dcp, dcp->bits, 0, modname);
}
static void ddebug_match_apply_kparam(const struct kernel_param *kp,
@@ -1185,9 +1209,9 @@ static void ddebug_match_apply_kparam(const struct kernel_param *kp,
dcp = (struct ddebug_class_param *)kp->arg;
if (map == dcp->map) {
- v2pr_info("found kp:%s =0x%lx", kp->name, *dcp->bits);
- vpr_cm_info(map, "mapped to:");
- ddebug_sync_classbits(dcp, modnm);
+ v2pr_info(" found kp:%s =0x%lx", kp->name, *dcp->bits);
+ vpr_cm_info(map, " mapped to:");
+ ddebug_sync_classbits(kp, modnm);
}
}
diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c
index ff9b879286d5..b3c6f90b9fe8 100644
--- a/lib/test_dynamic_debug.c
+++ b/lib/test_dynamic_debug.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Kernel module for testing dynamic_debug
+ * Kernel module to test/demonstrate dynamic_debug features,
+ * particularly classmaps and their support for subsystems like DRM.
*
* Authors:
* Jim Cromie <[email protected]>
@@ -35,24 +36,8 @@ module_param_cb(do_prints, ¶m_ops_do_prints, NULL, 0600);
#define CLASSMAP_BITMASK(width, base) (((1UL << (width)) - 1) << base)
-/* sysfs param wrapper, proto-API */
-#define DYNDBG_CLASSMAP_PARAM_(_model, _flags, _init) \
- static unsigned long bits_##_model = _init; \
- static struct ddebug_class_param _flags##_##_model = { \
- .bits = &bits_##_model, \
- .flags = #_flags, \
- .map = &map_##_model, \
- }; \
- module_param_cb(_flags##_##_model, ¶m_ops_dyndbg_classes, \
- &_flags##_##_model, 0600)
-#ifdef DEBUG
-#define DYNDBG_CLASSMAP_PARAM(_model, _flags) DYNDBG_CLASSMAP_PARAM_(_model, _flags, ~0)
-#else
-#define DYNDBG_CLASSMAP_PARAM(_model, _flags) DYNDBG_CLASSMAP_PARAM_(_model, _flags, 0)
-#endif
-
/*
- * Demonstrate/test all 4 class-typed classmaps with a sys-param.
+ * Demonstrate/test both types of classmaps, each with a sys-param.
*
* Each is 3 part: client-enum decl, _DEFINE, _PARAM.
* Declare them in blocks to show patterns of use (repetitions and
@@ -64,7 +49,7 @@ module_param_cb(do_prints, ¶m_ops_do_prints, NULL, 0600);
* Modules with multiple CLASSMAPS must have enums with distinct
* value-ranges, arranged below with explicit enum_sym = X inits.
*
- * Declare all 4 enums now, for different types
+ * Declare all enums now, for different types
*/
/* numeric input, independent bits */
@@ -83,12 +68,15 @@ enum cat_disjoint_bits {
/* numeric verbosity, V2 > V1 related */
enum cat_level_num { V0 = 14, V1, V2, V3, V4, V5, V6, V7 };
-/* recapitulate DRM's parent(drm.ko) <-- _submod(drivers,helpers) */
+/*
+ * use/demonstrate multi-module-group classmaps, as for DRM
+ */
#if !defined(TEST_DYNAMIC_DEBUG_SUBMOD)
/*
- * In single user, or parent / coordinator (drm.ko) modules, define
- * classmaps on the client enums above, and then declares the PARAMS
- * ref'g the classmaps. Each is exported.
+ * For module-groups of 1+, define classmaps with names (stringified
+ * enum-symbols) copied from above. 1-to-1 mapping is recommended.
+ * The classmap is exported, so that other modules in the group can
+ * link to it and control their prdbgs.
*/
DYNDBG_CLASSMAP_DEFINE(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS,
D2_CORE,
@@ -107,19 +95,18 @@ DYNDBG_CLASSMAP_DEFINE(map_level_num, DD_CLASS_TYPE_LEVEL_NUM,
V0, "V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7");
/*
- * now add the sysfs-params
+ * for use-cases that want it, provide a sysfs-param to set the
+ * classes in the classmap. It is at this interface where the
+ * "v3>v2" property is applied to DD_CLASS_TYPE_LEVEL_NUM inputs.
*/
-
-DYNDBG_CLASSMAP_PARAM(disjoint_bits, p);
-DYNDBG_CLASSMAP_PARAM(level_num, p);
+DYNDBG_CLASSMAP_PARAM(p_disjoint_bits, map_disjoint_bits, p);
+DYNDBG_CLASSMAP_PARAM(p_level_num, map_level_num, p);
#else /* TEST_DYNAMIC_DEBUG_SUBMOD */
-
/*
- * in submod/drm-drivers, use the classmaps defined in top/parent
- * module above.
+ * the +1 members of a multi-module group refer to the classmap
+ * DEFINEd (and exported) above.
*/
-
DYNDBG_CLASSMAP_USE(map_disjoint_bits);
DYNDBG_CLASSMAP_USE(map_level_num);
@@ -180,5 +167,6 @@ static void __exit test_dynamic_debug_exit(void)
module_init(test_dynamic_debug_init);
module_exit(test_dynamic_debug_exit);
+MODULE_DESCRIPTION("test/demonstrate dynamic-debug features");
MODULE_AUTHOR("Jim Cromie <[email protected]>");
MODULE_LICENSE("GPL");
diff --git a/lib/test_dynamic_debug_submod.c b/lib/test_dynamic_debug_submod.c
index 9a893402ce1a..0d15f3ffe466 100644
--- a/lib/test_dynamic_debug_submod.c
+++ b/lib/test_dynamic_debug_submod.c
@@ -1,6 +1,9 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * Kernel module for testing dynamic_debug
+ * Kernel module to test/demonstrate dynamic_debug features,
+ * particularly classmaps and their support for subsystems, like DRM,
+ * which defines its drm_debug classmap in drm module, and uses it in
+ * helpers & drivers.
*
* Authors:
* Jim Cromie <[email protected]>
@@ -8,3 +11,7 @@
#define TEST_DYNAMIC_DEBUG_SUBMOD
#include "test_dynamic_debug.c"
+
+MODULE_DESCRIPTION("test/demonstrate dynamic-debug subsystem support");
+MODULE_AUTHOR("Jim Cromie <[email protected]>");
+MODULE_LICENSE("GPL");
--
2.44.0
Describe the 3 API macros providing dynamic_debug's classmaps
DYNDBG_CLASSMAP_DEFINE - create, exports a module's classmap
DYNDBG_CLASSMAP_USE - refer to exported map
DYNDBG_CLASSMAP_PARAM - bind control param to the classmap
DYNDBG_CLASSMAP_PARAM_REF + use module's storage - __drm_debug
cc: [email protected]
Signed-off-by: Jim Cromie <[email protected]>
---
v5 adjustments per Randy Dunlap
v7 checkpatch fixes
v8 more
---
.../admin-guide/dynamic-debug-howto.rst | 63 ++++++++++++++++++-
1 file changed, 62 insertions(+), 1 deletion(-)
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
index 6a8ce5a34382..742eb4230c6e 100644
--- a/Documentation/admin-guide/dynamic-debug-howto.rst
+++ b/Documentation/admin-guide/dynamic-debug-howto.rst
@@ -225,7 +225,6 @@ the ``p`` flag has meaning, other flags are ignored.
Note the regexp ``^[-+=][fslmpt_]+$`` matches a flags specification.
To clear all flags at once, use ``=_`` or ``-fslmpt``.
-
Debug messages during Boot Process
==================================
@@ -375,3 +374,65 @@ just a shortcut for ``print_hex_dump(KERN_DEBUG)``.
For ``print_hex_dump_debug()``/``print_hex_dump_bytes()``, format string is
its ``prefix_str`` argument, if it is constant string; or ``hexdump``
in case ``prefix_str`` is built dynamically.
+
+Dynamic Debug classmaps
+=======================
+
+Dyndbg allows selection/grouping of *prdbg* callsites using structural
+info: module, file, function, line. Classmaps allow authors to add
+their own domain-oriented groupings using class-names. Classmaps are
+exported, so they referencable from other modules.
+
+ # enable classes individually
+ :#> ddcmd class DRM_UT_CORE +p
+ :#> ddcmd class DRM_UT_KMS +p
+ # or more selectively
+ :#> ddcmd class DRM_UT_CORE module drm +p
+
+The "class FOO" syntax protects class'd prdbgs from generic overwrite::
+
+ # IOW this doesn't wipe any DRM.debug settings
+ :#> ddcmd -p
+
+To support the DRM.debug parameter, DYNDBG_CLASSMAP_PARAM* updates all
+classes in a classmap, mapping param-bits 0..N onto the classes:
+DRM_UT_<*> for the DRM use-case.
+
+Dynamic Debug Classmap API
+==========================
+
+DYNDBG_CLASSMAP_DEFINE - modules use this to create classmaps, naming
+each of the classes (stringified enum-symbols: "DRM_UT_<*>"), and
+type, and mapping the class-names to consecutive _class_ids.
+
+By doing so, modules tell dyndbg that they have prdbgs with those
+class_ids, and they authorize dyndbg to accept "class FOO" for the
+module defining the classmap, and its contained classnames.
+
+DYNDBG_CLASSMAP_USE - drm drivers invoke this to ref the CLASSMAP that
+drm DEFINEs. This shares the classmap definition, and authorizes
+dyndbg to apply changes to the user module's class'd pr_debugs. It
+also tells dyndbg how to initialize the user's prdbgs at modprobe,
+based upon the current setting of the parent's controlling param.
+
+There are 2 types of classmaps:
+
+ DD_CLASS_TYPE_DISJOINT_BITS: classes are independent, like DRM.debug
+ DD_CLASS_TYPE_LEVEL_NUM: classes are relative, ordered (V3 > V2)
+
+DYNDBG_CLASSMAP_PARAM - modelled after module_param_cb, it refers to a
+DEFINEd classmap, and associates it to the param's data-store. This
+state is then applied to DEFINEr and USEr modules when they're modprobed.
+
+This interface also enforces the DD_CLASS_TYPE_LEVEL_NUM relation
+amongst the contained classnames; all classes are independent in the
+control parser itself.
+
+Modules or module-groups (drm & drivers) can define multiple
+classmaps, as long as they share the limited 0..62 per-module-group
+_class_id range, without overlap.
+
+``#define DEBUG`` will enable all pr_debugs in scope, including any
+class'd ones. This won't be reflected in the PARAM readback value,
+but the class'd pr_debug callsites can be forced off by toggling the
+classmap-kparam all-on then all-off.
--
2.44.0
New fn validates parsing and effect of queries using combinations of
commas and spaces to delimit the tokens.
It manipulates pr-debugs in builtin module/params, so might have deps
I havent foreseen on odd configurations.
Signed-off-by: Jim Cromie <[email protected]>
---
.../selftests/dynamic_debug/dyndbg_selftest.sh | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
index cb77ae142520..7a7d437e948b 100755
--- a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -217,9 +217,23 @@ EOF
ddcmd =_
}
+function comma_terminator_tests {
+ echo -e "${GREEN}# COMMA_TERMINATOR_TESTS ${NC}"
+ # try combos of spaces & commas
+ check_match_ct '\[params\]' 4 -r
+ ddcmd module,params,=_ # commas as spaces
+ ddcmd module,params,+mpf # turn on module's pr-debugs
+ check_match_ct =pmf 4
+ ddcmd ,module ,, , params, -p
+ check_match_ct =mf 4
+ ddcmd " , module ,,, , params, -m" #
+ check_match_ct =f 4
+ ddcmd =_
+}
tests_list=(
basic_tests
+ comma_terminator_tests
)
# Run tests
--
2.44.0
Remove the NAMED class types; these 2 classmap types accept class
names at the PARAM interface, for example:
echo +DRM_UT_CORE,-DRM_UT_KMS > /sys/module/drm/parameters/debug_names
The code works, but its only used by test-dynamic-debug, and wasn't
asked for by anyone else, so reduce test-surface, simplify things.
also rename enum class_map_type to enum ddebug_class_map_type.
Signed-off-by: Jim Cromie <[email protected]>
---
include/linux/dynamic_debug.h | 23 ++------
lib/dynamic_debug.c | 102 +++-------------------------------
lib/test_dynamic_debug.c | 26 ---------
3 files changed, 14 insertions(+), 137 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 8116d0a0d33a..dd304e231f08 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -58,27 +58,16 @@ struct _ddebug {
#endif
} __attribute__((aligned(8)));
-enum class_map_type {
+enum ddebug_class_map_type {
DD_CLASS_TYPE_DISJOINT_BITS,
/**
- * DD_CLASS_TYPE_DISJOINT_BITS: classes are independent, one per bit.
- * expecting hex input. Built for drm.debug, basis for other types.
+ * DD_CLASS_TYPE_DISJOINT_BITS: classes are independent, mapped to bits[0..N].
+ * Expects hex input. Built for drm.debug, basis for other types.
*/
DD_CLASS_TYPE_LEVEL_NUM,
/**
- * DD_CLASS_TYPE_LEVEL_NUM: input is numeric level, 0-N.
- * N turns on just bits N-1 .. 0, so N=0 turns all bits off.
- */
- DD_CLASS_TYPE_DISJOINT_NAMES,
- /**
- * DD_CLASS_TYPE_DISJOINT_NAMES: input is a CSV of [+-]CLASS_NAMES,
- * classes are independent, like _DISJOINT_BITS.
- */
- DD_CLASS_TYPE_LEVEL_NAMES,
- /**
- * DD_CLASS_TYPE_LEVEL_NAMES: input is a CSV of [+-]CLASS_NAMES,
- * intended for names like: INFO,DEBUG,TRACE, with a module prefix
- * avoid EMERG,ALERT,CRIT,ERR,WARNING: they're not debug
+ * DD_CLASS_TYPE_LEVEL_NUM: input is numeric level, 0..N.
+ * Input N turns on bits 0..N-1
*/
};
@@ -88,7 +77,7 @@ struct ddebug_class_map {
const char **class_names;
const int length;
const int base; /* index of 1st .class_id, allows split/shared space */
- enum class_map_type map_type;
+ enum ddebug_class_map_type map_type;
};
/**
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 43a8e04b8599..d5701207febc 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -636,76 +636,6 @@ static int ddebug_apply_class_bitmap(const struct ddebug_class_param *dcp,
#define CLASSMAP_BITMASK(width) ((1UL << (width)) - 1)
-/* accept comma-separated-list of [+-] classnames */
-static int param_set_dyndbg_classnames(const char *instr, const struct kernel_param *kp)
-{
- const struct ddebug_class_param *dcp = kp->arg;
- const struct ddebug_class_map *map = dcp->map;
- unsigned long curr_bits, old_bits;
- char *cl_str, *p, *tmp;
- int cls_id, totct = 0;
- bool wanted;
-
- cl_str = tmp = kstrdup_and_replace(instr, '\n', '\0', GFP_KERNEL);
- if (!tmp)
- return -ENOMEM;
-
- /* start with previously set state-bits, then modify */
- curr_bits = old_bits = *dcp->bits;
- vpr_info("\"%s\" > %s:0x%lx\n", cl_str, KP_NAME(kp), curr_bits);
-
- for (; cl_str; cl_str = p) {
- p = strchr(cl_str, ',');
- if (p)
- *p++ = '\0';
-
- if (*cl_str == '-') {
- wanted = false;
- cl_str++;
- } else {
- wanted = true;
- if (*cl_str == '+')
- cl_str++;
- }
- cls_id = match_string(map->class_names, map->length, cl_str);
- if (cls_id < 0) {
- pr_err("%s unknown to %s\n", cl_str, KP_NAME(kp));
- continue;
- }
-
- /* have one or more valid class_ids of one *_NAMES type */
- switch (map->map_type) {
- case DD_CLASS_TYPE_DISJOINT_NAMES:
- /* the +/- pertains to a single bit */
- if (test_bit(cls_id, &curr_bits) == wanted) {
- v3pr_info("no change on %s\n", cl_str);
- continue;
- }
- curr_bits ^= BIT(cls_id);
- totct += ddebug_apply_class_bitmap(dcp, &curr_bits, *dcp->bits, NULL);
- *dcp->bits = curr_bits;
- v2pr_info("%s: changed bit %d:%s\n", KP_NAME(kp), cls_id,
- map->class_names[cls_id]);
- break;
- case DD_CLASS_TYPE_LEVEL_NAMES:
- /* cls_id = N in 0..max. wanted +/- determines N or N-1 */
- old_bits = CLASSMAP_BITMASK(*dcp->lvl);
- curr_bits = CLASSMAP_BITMASK(cls_id + (wanted ? 1 : 0 ));
-
- totct += ddebug_apply_class_bitmap(dcp, &curr_bits, old_bits, NULL);
- *dcp->lvl = (cls_id + (wanted ? 1 : 0));
- v2pr_info("%s: changed bit-%d: \"%s\" %lx->%lx\n", KP_NAME(kp), cls_id,
- map->class_names[cls_id], old_bits, curr_bits);
- break;
- default:
- pr_err("illegal map-type value %d\n", map->map_type);
- }
- }
- kfree(tmp);
- vpr_info("total matches: %d\n", totct);
- return 0;
-}
-
static int param_set_dyndbg_module_classes(const char *instr,
const struct kernel_param *kp,
const char *modnm)
@@ -714,29 +644,17 @@ static int param_set_dyndbg_module_classes(const char *instr,
const struct ddebug_class_map *map = dcp->map;
unsigned long inrep, new_bits, old_bits;
int rc, totct = 0;
-
- switch (map->map_type) {
-
- case DD_CLASS_TYPE_DISJOINT_NAMES:
- case DD_CLASS_TYPE_LEVEL_NAMES:
- /* handle [+-]classnames list separately, we are done here */
- return param_set_dyndbg_classnames(instr, kp);
-
- case DD_CLASS_TYPE_DISJOINT_BITS:
- case DD_CLASS_TYPE_LEVEL_NUM:
- /* numeric input, accept and fall-thru */
- rc = kstrtoul(instr, 0, &inrep);
- if (rc) {
- pr_err("expecting numeric input: %s > %s\n", instr, KP_NAME(kp));
- return -EINVAL;
- }
- break;
- default:
- pr_err("%s: bad map type: %d\n", KP_NAME(kp), map->map_type);
+ char *nl;
+
+ rc = kstrtoul(instr, 0, &inrep);
+ if (rc) {
+ nl = strchr(instr, '\n');
+ if (nl)
+ *nl = '\0';
+ pr_err("expecting numeric input, not: %s > %s\n", instr, KP_NAME(kp));
return -EINVAL;
}
- /* only _BITS,_NUM (numeric) map-types get here */
switch (map->map_type) {
case DD_CLASS_TYPE_DISJOINT_BITS:
/* expect bits. mask and warn if too many */
@@ -801,12 +719,8 @@ int param_get_dyndbg_classes(char *buffer, const struct kernel_param *kp)
const struct ddebug_class_map *map = dcp->map;
switch (map->map_type) {
-
- case DD_CLASS_TYPE_DISJOINT_NAMES:
case DD_CLASS_TYPE_DISJOINT_BITS:
return scnprintf(buffer, PAGE_SIZE, "0x%lx\n", *dcp->bits);
-
- case DD_CLASS_TYPE_LEVEL_NAMES:
case DD_CLASS_TYPE_LEVEL_NUM:
return scnprintf(buffer, PAGE_SIZE, "%ld\n", *dcp->lvl);
default:
diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c
index a01f0193a419..9e950a911b6c 100644
--- a/lib/test_dynamic_debug.c
+++ b/lib/test_dynamic_debug.c
@@ -74,13 +74,6 @@ DECLARE_DYNDBG_CLASSMAP(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, 0,
DD_SYS_WRAP(disjoint_bits, p);
DD_SYS_WRAP(disjoint_bits, T);
-/* symbolic input, independent bits */
-enum cat_disjoint_names { LOW = 10, MID, HI };
-DECLARE_DYNDBG_CLASSMAP(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10,
- "LOW", "MID", "HI");
-DD_SYS_WRAP(disjoint_names, p);
-DD_SYS_WRAP(disjoint_names, T);
-
/* numeric verbosity, V2 > V1 related */
enum cat_level_num { V0 = 14, V1, V2, V3, V4, V5, V6, V7 };
DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,
@@ -88,13 +81,6 @@ DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,
DD_SYS_WRAP(level_num, p);
DD_SYS_WRAP(level_num, T);
-/* symbolic verbosity */
-enum cat_level_names { L0 = 22, L1, L2, L3, L4, L5, L6, L7 };
-DECLARE_DYNDBG_CLASSMAP(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22,
- "L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7");
-DD_SYS_WRAP(level_names, p);
-DD_SYS_WRAP(level_names, T);
-
/* stand-in for all pr_debug etc */
#define prdbg(SYM) __pr_debug_cls(SYM, #SYM " msg\n")
@@ -102,10 +88,6 @@ static void do_cats(void)
{
pr_debug("doing categories\n");
- prdbg(LOW);
- prdbg(MID);
- prdbg(HI);
-
prdbg(D2_CORE);
prdbg(D2_DRIVER);
prdbg(D2_KMS);
@@ -129,14 +111,6 @@ static void do_levels(void)
prdbg(V5);
prdbg(V6);
prdbg(V7);
-
- prdbg(L1);
- prdbg(L2);
- prdbg(L3);
- prdbg(L4);
- prdbg(L5);
- prdbg(L6);
- prdbg(L7);
}
static void do_prints(void)
--
2.44.0
Add a selftest script for dynamic-debug. The config requires
CONFIG_TEST_DYNAMIC_DEBUG=m (and CONFIG_TEST_DYNAMIC_DEBUG_SUBMOD=m),
which tacitly requires either CONFIG_DYNAMIC_DEBUG=y or
CONFIG_DYNAMIC_DEBUG_CORE=y
ATM this has just basic_tests(), it modifies pr_debug flags in a few
builtins (init/main, params), counts the callsite flags changed, and
verifies against expected values.
This is backported from another feature branch; the support-fns (thx
Lukas) have unused features at the moment, they'll get used shortly.
The script enables simple virtme-ng testing:
$> vng --verbose --name v6.8-32-g30d431000676 --user root \
--cwd ../.. -a dynamic_debug.verbose=2 -p 4 \
./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
virtme: waiting for virtiofsd to start
virtme: use 'microvm' QEMU architecture
..
[ 4.136168] virtme-init: Setting hostname to v6.8-32-g30d431000676...
[ 4.240874] virtme-init: starting script
test_dynamic_debug_submod not there
test_dynamic_debug not there
..
[ 4.474435] virtme-init: script returned {0}
Powering off.
[ 4.529318] ACPI: PM: Preparing to enter system sleep state S5
[ 4.529991] kvm: exiting hardware virtualization
[ 4.530428] reboot: Power down
And add dynamic_debug to TARGETS, so `make run_tests` sees it properly
for the impatient, set TARGETS explicitly:
bash-5.2# make TARGETS=dynamic_debug run_tests
make[1]: ...
TAP version 13
1..1
[ 35.552922] dyndbg: read 3 bytes from userspace
[ 35.553099] dyndbg: query 0: "=_" mod:*
[ 35.553544] dyndbg: processed 1 queries, with 1778 matches, 0 errs
..
TLDR:
This selftest is slightly naive wrt the init state of call-site flags.
In particular, it fails if class'd pr_debugs have been set
$ cat /etc/modprobe.d/drm-test.conf
options drm dyndbg=class,DRM_UT_CORE,+mfslt%class,DRM_UT_KMS,+mf
By Contract, class'd pr_debugs are protected from alteration by
default (only by direct "class FOO" queries), so the "=_" logged above
(TAP version 13) cannot affect the DRM_UT_CORE,KMS pr_debugs.
These class'd flag-settings, added by modprobe, alter the counts of
flag-matching patterns, breaking the tests' expectations.
Signed-off-by: Jim Cromie <[email protected]>
Co-developed-by: Łukasz Bartosik <[email protected]>
Signed-off-by: Łukasz Bartosik <[email protected]>
---
MAINTAINERS | 1 +
tools/testing/selftests/Makefile | 1 +
.../testing/selftests/dynamic_debug/Makefile | 9 +
tools/testing/selftests/dynamic_debug/config | 2 +
.../dynamic_debug/dyndbg_selftest.sh | 231 ++++++++++++++++++
5 files changed, 244 insertions(+)
create mode 100644 tools/testing/selftests/dynamic_debug/Makefile
create mode 100644 tools/testing/selftests/dynamic_debug/config
create mode 100755 tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
diff --git a/MAINTAINERS b/MAINTAINERS
index cf9fccbc6bde..bdffd192d3df 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7526,6 +7526,7 @@ S: Maintained
F: include/linux/dynamic_debug.h
F: lib/dynamic_debug.c
F: lib/test_dynamic_debug*.c
+F: tools/testing/selftest/dynamic_debug/*
DYNAMIC INTERRUPT MODERATION
M: Tal Gilboa <[email protected]>
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index e1504833654d..84edf0bd8e80 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -20,6 +20,7 @@ TARGETS += drivers/s390x/uvdevice
TARGETS += drivers/net/bonding
TARGETS += drivers/net/team
TARGETS += dt
+TARGETS += dynamic_debug
TARGETS += efivarfs
TARGETS += exec
TARGETS += fchmodat2
diff --git a/tools/testing/selftests/dynamic_debug/Makefile b/tools/testing/selftests/dynamic_debug/Makefile
new file mode 100644
index 000000000000..6d06fa7f1040
--- /dev/null
+++ b/tools/testing/selftests/dynamic_debug/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# borrowed from Makefile for user memory selftests
+
+# No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
+all:
+
+TEST_PROGS := dyndbg_selftest.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/dynamic_debug/config b/tools/testing/selftests/dynamic_debug/config
new file mode 100644
index 000000000000..d080da571ac0
--- /dev/null
+++ b/tools/testing/selftests/dynamic_debug/config
@@ -0,0 +1,2 @@
+CONFIG_TEST_DYNAMIC_DEBUG=m
+CONFIG_TEST_DYNAMIC_DEBUG_SUBMOD=m
diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
new file mode 100755
index 000000000000..1be70af26a38
--- /dev/null
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -0,0 +1,231 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+
+V=${V:=0} # invoke as V=1 $0 for global verbose
+RED="\033[0;31m"
+GREEN="\033[0;32m"
+YELLOW="\033[0;33m"
+BLUE="\033[0;34m"
+MAGENTA="\033[0;35m"
+CYAN="\033[0;36m"
+NC="\033[0;0m"
+error_msg=""
+
+function vx () {
+ echo $1 > /sys/module/dynamic_debug/parameters/verbose
+}
+
+function ddgrep () {
+ grep $1 /proc/dynamic_debug/control
+}
+
+function doprints () {
+ cat /sys/module/test_dynamic_debug/parameters/do_prints
+}
+
+function ddcmd () {
+ exp_exit_code=0
+ num_args=$#
+ if [ "${@:$#}" = "pass" ]; then
+ num_args=$#-1
+ elif [ "${@:$#}" = "fail" ]; then
+ num_args=$#-1
+ exp_exit_code=1
+ fi
+ args=${@:1:$num_args}
+ output=$((echo "$args" > /proc/dynamic_debug/control) 2>&1)
+ exit_code=$?
+ error_msg=$(echo $output | cut -d ":" -f 5 | sed -e 's/^[[:space:]]*//')
+ handle_exit_code $BASH_LINENO $FUNCNAME $exit_code $exp_exit_code
+}
+
+function handle_exit_code() {
+ local exp_exit_code=0
+ [ $# == 4 ] && exp_exit_code=$4
+ if [ $3 -ne $exp_exit_code ]; then
+ echo -e "${RED}: $BASH_SOURCE:$1 $2() expected to exit with code $exp_exit_code"
+ [ $3 == 1 ] && echo "Error: '$error_msg'"
+ exit
+ fi
+}
+
+# $1 - pattern to match, pattern in $1 is enclosed by spaces for a match ""\s$1\s"
+# $2 - number of times the pattern passed in $1 is expected to match
+# $3 - optional can be set either to "-r" or "-v"
+# "-r" means relaxed matching in this case pattern provided in $1 is passed
+# as is without enclosing it with spaces
+# "-v" prints matching lines
+# $4 - optional when $3 is set to "-r" then $4 can be used to pass "-v"
+function check_match_ct {
+ pattern="\s$1\s"
+ exp_cnt=0
+
+ [ "$3" == "-r" ] && pattern="$1"
+ let cnt=$(ddgrep "$pattern" | wc -l)
+ if [ $V -eq 1 ] || [ "$3" == "-v" ] || [ "$4" == "-v" ]; then
+ echo -ne "${BLUE}" && ddgrep $pattern && echo -ne "${NC}"
+ fi
+ [ $# -gt 1 ] && exp_cnt=$2
+ if [ $cnt -ne $exp_cnt ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO check failed expected $exp_cnt on $1, got $cnt"
+ exit
+ else
+ echo ": $cnt matches on $1"
+ fi
+}
+
+# $1 - trace instance name
+# #2 - if > 0 then directory is expected to exist, if <= 0 then otherwise
+# $3 - "-v" for verbose
+function check_trace_instance_dir {
+ if [ -e /sys/kernel/tracing/instances/$1 ]; then
+ if [ "$3" == "-v" ] ; then
+ echo "ls -l /sys/kernel/tracing/instances/$1: "
+ ls -l /sys/kernel/tracing/instances/$1
+ fi
+ if [ $2 -le 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO error trace instance \
+ '/sys/kernel/tracing/instances/$1' does exist"
+ exit
+ fi
+ else
+ if [ $2 -gt 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO error trace instance \
+ '/sys/kernel/tracing/instances/$1' does not exist"
+ exit
+ fi
+ fi
+}
+
+function tmark {
+ echo $* > /sys/kernel/tracing/trace_marker
+}
+
+# $1 - trace instance name
+# $2 - line number
+# $3 - if > 0 then the instance is expected to be opened, otherwise
+# the instance is expected to be closed
+function check_trace_instance {
+ output=$(tail -n9 /proc/dynamic_debug/control | grep ": Opened trace instances" \
+ | xargs -n1 | grep $1)
+ if [ "$output" != $1 ] && [ $3 -gt 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$2 trace instance $1 is not opened"
+ exit
+ fi
+ if [ "$output" == $1 ] && [ $3 -le 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$2 trace instance $1 is not closed"
+ exit
+ fi
+}
+
+function is_trace_instance_opened {
+ check_trace_instance $1 $BASH_LINENO 1
+}
+
+function is_trace_instance_closed {
+ check_trace_instance $1 $BASH_LINENO 0
+}
+
+# $1 - trace instance directory to delete
+# $2 - if > 0 then directory is expected to be deleted successfully, if <= 0 then otherwise
+function del_trace_instance_dir() {
+ exp_exit_code=1
+ [ $2 -gt 0 ] && exp_exit_code=0
+ output=$((rmdir /sys/kernel/debug/tracing/instances/$1) 2>&1)
+ exit_code=$?
+ error_msg=$(echo $output | cut -d ":" -f 3 | sed -e 's/^[[:space:]]*//')
+ handle_exit_code $BASH_LINENO $FUNCNAME $exit_code $exp_exit_code
+}
+
+function error_log_ref {
+ # to show what I got
+ : echo "# error-log-ref: $1"
+ : echo cat \$2
+}
+
+function ifrmmod {
+ lsmod | grep $1 2>&1>/dev/null || echo $1 not there
+ lsmod | grep $1 2>&1>/dev/null && rmmod $1
+}
+
+# $1 - text to search for
+function search_trace() {
+ search_trace_name 0 1 $1
+}
+
+# $1 - trace instance name, 0 for global event trace
+# $2 - line number counting from the bottom
+# $3 - text to search for
+function search_trace_name() {
+ if [ "$1" = "0" ]; then
+ buf=$(cat /sys/kernel/debug/tracing/trace)
+ line=$(tail -$2 /sys/kernel/debug/tracing/trace | head -1 | sed -e 's/^[[:space:]]*//')
+ else
+ buf=$(cat /sys/kernel/debug/tracing/instances/$1/trace)
+ line=$(tail -$2 /sys/kernel/debug/tracing/instances/$1/trace | head -1 | \
+ sed -e 's/^[[:space:]]*//')
+ fi
+ if [ $2 = 0 ]; then
+ # whole-buf check
+ output=$(echo $buf | grep "$3")
+ else
+ output=$(echo $line | grep "$3")
+ fi
+ if [ "$output" = "" ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO search for '$3' failed \
+ in line '$line' or '$buf'"
+ exit
+ fi
+ if [ $V = 1 ]; then
+ echo -e "${MAGENTA}: search_trace_name in $1 found: \n$output \nin:${BLUE} $buf ${NC}"
+ fi
+}
+
+# $1 - error message to check
+function check_err_msg() {
+ if [ "$error_msg" != "$1" ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO error message '$error_msg' \
+ does not match with '$1'"
+ exit
+ fi
+}
+
+function basic_tests {
+ echo -e "${GREEN}# BASIC_TESTS ${NC}"
+ ddcmd =_ # zero everything (except class'd sites)
+ check_match_ct =p 0
+ # there are several main's :-/
+ ddcmd module main file */module/main.c +p
+ check_match_ct =p 14
+ ddcmd =_
+ check_match_ct =p 0
+ # multi-cmd input, newline separated, with embedded comments
+ cat <<"EOF" > /proc/dynamic_debug/control
+ module main +mf # multi-query
+ module main file init/main.c +ml # newline separated
+EOF
+ # the intersection of all those main's is hard to track/count
+ # esp when mixed with overlapping greps
+ check_match_ct =mf 21
+ check_match_ct =ml 0
+ check_match_ct =mfl 6
+ ddcmd =_
+}
+
+
+tests_list=(
+ basic_tests
+)
+
+# Run tests
+
+ifrmmod test_dynamic_debug_submod
+ifrmmod test_dynamic_debug
+
+for test in "${tests_list[@]}"
+do
+ $test
+ echo ""
+done
+echo -en "${GREEN}# Done on: "
+date
--
2.44.0
DECLARE_DYNDBG_CLASSMAP() has a design error; its usage fails a basic
K&R rule: "define once, refer many times".
It is used across DRM core & drivers, each use re-defines the classmap
understood by that module; and all must match for the modules to
respond together when DRM.debug categories are enabled. This is
brittle, rubbish.
Worse, it causes the CONFIG_DRM_USE_DYNAMIC_DEBUG=Y regression; 1st
drm.ko loads, and dyndbg initializes its DRM.debug callsites, then a
drm-driver loads, but too late - it missed the DRM.debug enablement.
So replace it with 2 macros:
DYNDBG_CLASSMAP_DEFINE - invoked once from core - drm.ko
DYNDBG_CLASSMAP_USE - from all drm drivers and helpers.
DYNDBG_CLASSMAP_DEFINE: it reuses a renamed DECLARE_DYNDBG_CLASSMAP to
construct the struct classmap variable, but it drops the static
qualifier, and exports it instead.
DYNDBG_CLASSMAP_USE: then refers to the exported var by name:
* used from drivers, helper-mods
* lets us drop the repetitive "classname" args
* fixes 2nd-defn problem
* creates a ddebug_class_user record in new __dyndbg_class_users section
this allows ddebug_add_module(etal) to handle them per-module.
DECLARE_DYNDBG_CLASSMAP is preserved temporarily, to decouple DRM
adaptation work and avoid compile-errs before its done. IOW, DRM
gets fixed when they commit the adopt-new-api patches.
The DEFINE,USE distinction, and the separate usage record, allows
dyndbg to initialize the drivers & helpers DRM.debug callsites
separately after each is modprobed.
Basically, the classmap init-scan repeated for classmap-users.
To review, dyndbg's existing __dyndbg_classes[] section does:
catalogs the classmaps defined by a module (or builtin modules)
authorizes dyndbg to >control those class'd prdbgs for the module.
DYNDBG_CLASSMAP_DEFINE creates classmaps in this section.
This patch adds __dyndbg_class_users[] section:
catalogs uses/references to the classmap definitions.
authorizes dyndbg to >control those class'd prdbgs in ref'g module.
DYNDBG_CLASSMAP_USE() creates classmap-user records in this new section.
Now ddebug_add_module(etal) can handle classmap-uses similar to (and
after) classmaps; when a dependent module is loaded, its parent's
kernel params are scanned to find if a param is wired to dyndbg's
param-ops, whose classmap ref is the one being looked for.
To support this, theres a few data/header changes:
new struct ddebug_class_user
contains: user-module-name, &classmap-defn
it records drm-driver's use of a classmap in the section, allowing lookup
struct ddebug_info gets 2 more fields to keep the new section with the others:
class_users, num_class_users.
set by dynamic_debug_init() for builtins.
or by kernel/module/main:load_info() for loadable modules.
vmlinux.lds.h: new BOUNDED_SECTION for __dyndbg_class_users
dynamic_debug.c has 2 changes in ddebug_add_module(), ddebug_change():
ddebug_add_module() already calls ddebug_attach_module_classes()
to handle classmaps DEFINEd by a module, now it also calls
ddebug_attach_user_module_classes() to handle USEd classmaps. To
avoid this work when possible, 1st scan the module's descriptors and
count the number of class'd pr_debugs.
ddebug_attach_user_module_classes() scans the module's class_users
section, follows the refs to the parent's classmap, and calls
ddebug_apply_params() on each. It also avoids work by checking the
module's class-ct.
ddebug_apply_params(new fn):
It scans module's/builtin kernel-params, calls ddebug_match_apply_kparam
for each to find the params/sysfs-nodes which may be wired to a classmap.
ddebug_match_apply_kparam(new fn):
1st, it tests the kernel-param.ops is dyndbg's; this guarantees that
the attached arg is a struct ddebug_class_param, which has a ref to
the param's state, and to the classmap defining the param's handling.
2nd, it requires that the classmap ref'd by the kparam is the one
we're called for; modules can use many separate classmaps (as
test_dynamic_debug does).
Then apply the "parent" kparam's setting to the dependent module,
using ddebug_apply_class_bitmap().
ddebug_change(and callees) also gets adjustments:
ddebug_find_valid_class(): This does a search over the module's
classmaps, looking for the class FOO echo'd to >control. So now it
searches over __dyndbg_class_users[] after __dyndbg_classes[].
ddebug_class_name(): return class-names for defined AND used classes.
test_dynamic_debug.c, test_dynamic_debug_submod.c:
This demonstrates the 2 types of classmaps & sysfs-params, following
the 4-part recipe:
1. define an enum for the classmap: DRM.debug has DRM_UT_{CORE,KMS,...}
multiple classes must share 0-62 classid space.
2. DYNDBG_CLASSMAP_DEFINE(.. DRM_UT_{CORE,KMS,...})
3. DYNDBG_CLASSMAP_PARAM* (classmap)
4. DYNDBG_CLASSMAP_USE()
by _submod only, skipping 2,3
Move all the enum declarations together, to better explain how they
share the 0..62 class-id space available to a module (non-overlapping
subranges).
reorg macros 2,3 by name. This gives a tabular format, making it easy
to see the pattern of repetition, and the points of change.
And extend the test to replicate the 2-module (parent & dependent)
scenario which caused the CONFIG_DRM_USE_DYNAMIC_DEBUG=y regression
seen in drm & drivers.
The _submod.c is a 2-line file: #define _SUBMOD, #include parent.
This gives identical complements of prdbgs in parent & _submod, and
thus identical print behavior when all of: >control, >params, and
parent->_submod propagation are working correctly.
It also puts all the parent/_submod declarations together in the same
source, with the new ifdef _SUBMOD block invoking DYNDBG_CLASSMAP_USE
for the 2 test-interfaces. I think this is clearer.
These 2 modules are both tristate, allowing 3 super/sub combos: Y/Y,
Y/M, M/M (not N/N). Y/Y testing exposed a missing __align(8) in the
_METADATA macro, which M/M didn't see because the module-loader memory
placement constrains it instead.
DEBUG details:
``#define DEBUG`` in src enables all pr_debugs after it, including any
class'd pr_debugs; its not necessarily all-or-nothing, unless you do
the define in a header. Also, the only way to disable them is with
the classmap-kparam or using "class foo -p" >control queries.
Fixes: aad0214f3026 ("dyndbg: add DECLARE_DYNDBG_CLASSMAP macro")
Ref: bb2ff6c27bc9 ("drm: Disable dynamic debug as broken")
Signed-off-by: Jim Cromie <[email protected]>
---
v8 - split drm parts to separate commits.
preserve DECLARE_DYNDBG_CLASSMAP to decouple DRM, no flag day.
v7 - previous submission-blocking bug:
missing __align(8) in DYNAMIC_DEBUG_DECLARE_METADATA on
ddebug_class_user caused corrupt records, but only for builtin
modules; module loader code probably pinned allocations to the right
alignment naturally, hiding the bug for typical builds.
v6- get rid of WARN_ON_ONCE
v?- fix _var expanded 2x in macro
---
MAINTAINERS | 2 +-
include/asm-generic/vmlinux.lds.h | 1 +
include/linux/dynamic_debug.h | 61 ++++++++--
kernel/module/main.c | 3 +
lib/Kconfig.debug | 24 +++-
lib/Makefile | 3 +
lib/dynamic_debug.c | 183 ++++++++++++++++++++++++++----
lib/test_dynamic_debug.c | 111 ++++++++++++------
lib/test_dynamic_debug_submod.c | 10 ++
9 files changed, 330 insertions(+), 68 deletions(-)
create mode 100644 lib/test_dynamic_debug_submod.c
diff --git a/MAINTAINERS b/MAINTAINERS
index ebf03f5f0619..cf9fccbc6bde 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7525,7 +7525,7 @@ M: Jim Cromie <[email protected]>
S: Maintained
F: include/linux/dynamic_debug.h
F: lib/dynamic_debug.c
-F: lib/test_dynamic_debug.c
+F: lib/test_dynamic_debug*.c
DYNAMIC INTERRUPT MODERATION
M: Tal Gilboa <[email protected]>
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index f7749d0f2562..f1d8e64b244c 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -365,6 +365,7 @@
/* implement dynamic printk debug */ \
. = ALIGN(8); \
BOUNDED_SECTION_BY(__dyndbg_classes, ___dyndbg_classes) \
+ BOUNDED_SECTION_BY(__dyndbg_class_users, ___dyndbg_class_users) \
BOUNDED_SECTION_BY(__dyndbg, ___dyndbg) \
LIKELY_PROFILE() \
BRANCH_PROFILE() \
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index dd304e231f08..d1fc3035e19c 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -72,8 +72,8 @@ enum ddebug_class_map_type {
};
struct ddebug_class_map {
- struct module *mod;
- const char *mod_name; /* needed for builtins */
+ const struct module *mod; /* NULL for builtins */
+ const char *mod_name;
const char **class_names;
const int length;
const int base; /* index of 1st .class_id, allows split/shared space */
@@ -81,11 +81,33 @@ struct ddebug_class_map {
};
/**
- * DECLARE_DYNDBG_CLASSMAP - declare classnames known by a module
- * @_var: a struct ddebug_class_map, passed to module_param_cb
- * @_type: enum class_map_type, chooses bits/verbose, numeric/symbolic
- * @_base: offset of 1st class-name. splits .class_id space
- * @classes: class-names used to control class'd prdbgs
+ * DYNDBG_CLASSMAP_DEFINE - define a set of debug-classes used by a module.
+ * @_var: name of the classmap, exported for other modules coordinated use.
+ * @_type: enum ddebug_class_map_type, chooses bits/verbose, numeric/names.
+ * @_base: offset of 1st class-name, used to share 0..62 classid space
+ * @classes: vals are stringified enum-vals, like DRM_UT_*
+ *
+ * Defines and exports a struct ddebug_class_map whose @classes are
+ * used to validate a "class FOO .." >control command on the module
+ */
+#define __DYNDBG_CLASSMAP_DEFINE(_var, _maptype, _base, ...) \
+ const char *_var##_classnames[] = { __VA_ARGS__ }; \
+ struct ddebug_class_map __aligned(8) __used \
+ __section("__dyndbg_classes") _var = { \
+ .mod = THIS_MODULE, \
+ .mod_name = KBUILD_MODNAME, \
+ .base = _base, \
+ .map_type = _maptype, \
+ .length = ARRAY_SIZE(_var##_classnames), \
+ .class_names = _var##_classnames, \
+ }
+#define DYNDBG_CLASSMAP_DEFINE(_var, ...) \
+ __DYNDBG_CLASSMAP_DEFINE(_var, __VA_ARGS__); \
+ EXPORT_SYMBOL(_var)
+
+/*
+ XXX: keep this until DRM applies adaptations, it differs from
+ __DYNDBG_CLASSMAP_DEFINE only in the static on the struct decl.
*/
#define DECLARE_DYNDBG_CLASSMAP(_var, _maptype, _base, ...) \
static const char *_var##_classnames[] = { __VA_ARGS__ }; \
@@ -99,12 +121,37 @@ struct ddebug_class_map {
.class_names = _var##_classnames, \
}
+struct ddebug_class_user {
+ char *user_mod_name;
+ struct ddebug_class_map *map;
+};
+
+/**
+ * DYNDBG_CLASSMAP_USE - refer to a classmap, DEFINEd elsewhere.
+ * @_var: name of the exported classmap var
+ *
+ * This registers a module's use of another module's classmap defn, so
+ * dyndbg can authorize "class DRM_CORE ..." >control commands upon
+ * this module.
+ */
+#define DYNDBG_CLASSMAP_USE(_var) \
+ DYNDBG_CLASSMAP_USE_(_var, __UNIQUE_ID(ddebug_class_user))
+#define DYNDBG_CLASSMAP_USE_(_var, _uname) \
+ extern struct ddebug_class_map _var; \
+ static struct ddebug_class_user __aligned(8) __used \
+ __section("__dyndbg_class_users") _uname = { \
+ .user_mod_name = KBUILD_MODNAME, \
+ .map = &(_var), \
+ }
+
/* encapsulate linker provided built-in (or module) dyndbg data */
struct _ddebug_info {
struct _ddebug *descs;
struct ddebug_class_map *classes;
+ struct ddebug_class_user *class_users;
unsigned int num_descs;
unsigned int num_classes;
+ unsigned int num_class_users;
};
struct ddebug_class_param {
diff --git a/kernel/module/main.c b/kernel/module/main.c
index e1e8a7a9d6c1..9f7ce0f0e6e5 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -2217,6 +2217,9 @@ static int find_module_sections(struct module *mod, struct load_info *info)
mod->dyndbg_info.classes = section_objs(info, "__dyndbg_classes",
sizeof(*mod->dyndbg_info.classes),
&mod->dyndbg_info.num_classes);
+ mod->dyndbg_info.class_users = section_objs(info, "__dyndbg_class_users",
+ sizeof(*mod->dyndbg_info.class_users),
+ &mod->dyndbg_info.num_class_users);
#endif
return 0;
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c63a5fbf1f1c..bcc2549c01e9 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2796,12 +2796,26 @@ config TEST_STATIC_KEYS
If unsure, say N.
config TEST_DYNAMIC_DEBUG
- tristate "Test DYNAMIC_DEBUG"
- depends on DYNAMIC_DEBUG
+ tristate "Build test-dynamic-debug module"
+ depends on DYNAMIC_DEBUG || DYNAMIC_DEBUG_CORE
help
- This module registers a tracer callback to count enabled
- pr_debugs in a 'do_debugging' function, then alters their
- enablements, calls the function, and compares counts.
+ This module exersizes/demonstrates dyndbg's classmap API, by
+ creating 2 classes: a DISJOINT classmap (supporting DRM.debug)
+ and a LEVELS/VERBOSE classmap (like verbose2 > verbose1).
+
+ If unsure, say N.
+
+config TEST_DYNAMIC_DEBUG_SUBMOD
+ tristate "Build test-dynamic-debug submodule"
+ default m
+ depends on DYNAMIC_DEBUG || DYNAMIC_DEBUG_CORE
+ depends on TEST_DYNAMIC_DEBUG
+ help
+ This sub-module uses a classmap defined and exported by the
+ parent module, recapitulating drm & driver's shared use of
+ drm.debug to control enabled debug-categories.
+ It is tristate, independent of parent, to allow testing all
+ proper combinations of parent=y/m submod=y/m.
If unsure, say N.
diff --git a/lib/Makefile b/lib/Makefile
index ffc6b2341b45..d3e6a48f202b 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -82,6 +82,7 @@ obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
obj-$(CONFIG_TEST_DYNAMIC_DEBUG) += test_dynamic_debug.o
+obj-$(CONFIG_TEST_DYNAMIC_DEBUG_SUBMOD) += test_dynamic_debug_submod.o
obj-$(CONFIG_TEST_PRINTF) += test_printf.o
obj-$(CONFIG_TEST_SCANF) += test_scanf.o
@@ -240,6 +241,8 @@ obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o
obj-$(CONFIG_DYNAMIC_DEBUG_CORE) += dynamic_debug.o
#ensure exported functions have prototypes
CFLAGS_dynamic_debug.o := -DDYNAMIC_DEBUG_MODULE
+CFLAGS_test_dynamic_debug.o := -DDYNAMIC_DEBUG_MODULE
+CFLAGS_test_dynamic_debug_submod.o := -DDYNAMIC_DEBUG_MODULE
obj-$(CONFIG_SYMBOLIC_ERRNAME) += errname.o
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index d5701207febc..f0a274a3cc9e 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -43,13 +43,16 @@ extern struct _ddebug __start___dyndbg[];
extern struct _ddebug __stop___dyndbg[];
extern struct ddebug_class_map __start___dyndbg_classes[];
extern struct ddebug_class_map __stop___dyndbg_classes[];
+extern struct ddebug_class_user __start___dyndbg_class_users[];
+extern struct ddebug_class_user __stop___dyndbg_class_users[];
struct ddebug_table {
struct list_head link;
const char *mod_name;
struct _ddebug *ddebugs;
struct ddebug_class_map *classes;
- unsigned int num_ddebugs, num_classes;
+ struct ddebug_class_user *class_users;
+ unsigned int num_ddebugs, num_classes, num_class_users;
};
struct ddebug_query {
@@ -148,21 +151,39 @@ static void vpr_info_dq(const struct ddebug_query *query, const char *msg)
query->first_lineno, query->last_lineno, query->class_string);
}
+#define vpr_dt_info(dt_p, msg_p, ...) ({ \
+ struct ddebug_table const *_dt = dt_p; \
+ v2pr_info(msg_p " module:%s nd:%d nc:%d nu:%d\n", ##__VA_ARGS__, \
+ _dt->mod_name, _dt->num_ddebugs, _dt->num_classes, \
+ _dt->num_class_users); \
+ })
+
#define __outvar /* filled by callee */
static struct ddebug_class_map *ddebug_find_valid_class(struct ddebug_table const *dt,
const char *class_string,
__outvar int *class_id)
{
struct ddebug_class_map *map;
+ struct ddebug_class_user *cli;
int i, idx;
- for (map = dt->classes, i = 0; i < dt->num_classes; i++, map++) {
+ for (i = 0, map = dt->classes; i < dt->num_classes; i++, map++) {
idx = match_string(map->class_names, map->length, class_string);
if (idx >= 0) {
*class_id = idx + map->base;
+ vpr_dt_info(dt, "good-class: %s.%s ", map->mod_name, class_string);
return map;
}
}
+ for (i = 0, cli = dt->class_users; i < dt->num_class_users; i++, cli++) {
+ idx = match_string(cli->map->class_names, cli->map->length, class_string);
+ if (idx >= 0) {
+ *class_id = idx + cli->map->base;
+ vpr_dt_info(dt, "class-ref: %s.%s ",
+ cli->user_mod_name, class_string);
+ return cli->map;
+ }
+ }
*class_id = -ENOENT;
return NULL;
}
@@ -559,7 +580,7 @@ static int ddebug_exec_query(char *query_string, const char *modname)
/* handle multiple queries in query string, continue on error, return
last error or number of matching callsites. Module name is either
- in param (for boot arg) or perhaps in query string.
+ in the modname arg (for boot args) or perhaps in query string.
*/
static int ddebug_exec_queries(char *query, const char *modname)
{
@@ -688,12 +709,12 @@ static int param_set_dyndbg_module_classes(const char *instr,
}
/**
- * param_set_dyndbg_classes - class FOO >control
+ * param_set_dyndbg_classes - set all classes in a classmap
* @instr: string echo>d to sysfs, input depends on map_type
- * @kp: kp->arg has state: bits/lvl, map, map_type
+ * @kp: kp->arg has state: bits/lvl, classmap, map_type
*
- * Enable/disable prdbgs by their class, as given in the arguments to
- * DECLARE_DYNDBG_CLASSMAP. For LEVEL map-types, enforce relative
+ * For all classes in the classmap, enable/disable them per the input
+ * (depending on map_type). For LEVEL map-types, enforce relative
* levels by bitpos.
*
* Returns: 0 or <0 if error.
@@ -1038,12 +1059,17 @@ static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
static const char *ddebug_class_name(struct ddebug_table *dt, struct _ddebug *dp)
{
struct ddebug_class_map *map = dt->classes;
+ struct ddebug_class_user *cli = dt->class_users;
int i;
for (i = 0; i < dt->num_classes; i++, map++)
if (class_in_range(dp->class_id, map))
return map->class_names[dp->class_id - map->base];
+ for (i = 0; i < dt->num_class_users; i++, cli++)
+ if (class_in_range(dp->class_id, cli->map))
+ return cli->map->class_names[dp->class_id - cli->map->base];
+
return NULL;
}
@@ -1124,31 +1150,133 @@ static const struct proc_ops proc_fops = {
.proc_write = ddebug_proc_write
};
+static const char * const ddebug_classmap_typenames[] = {
+ "DISJOINT_BITS", "LEVEL_NUM"
+};
+
+#define vpr_cm_info(cm_p, msg_p, ...) ({ \
+ struct ddebug_class_map const *_cm = cm_p; \
+ v2pr_info(msg_p " module:%s base:%d len:%d type:%s\n", ##__VA_ARGS__, \
+ _cm->mod_name, _cm->base, _cm->length, \
+ ddebug_classmap_typenames[_cm->map_type]); \
+ })
+
+static void ddebug_sync_classbits(const struct ddebug_class_param *dcp, const char *modname)
+{
+ /* clamp initial bitvec, mask off hi-bits */
+ if (*dcp->bits & ~CLASSMAP_BITMASK(dcp->map->length)) {
+ *dcp->bits &= CLASSMAP_BITMASK(dcp->map->length);
+ v2pr_info("preset classbits: %lx\n", *dcp->bits);
+ }
+ /* force class'd prdbgs (in USEr module) to match (DEFINEr module) class-param */
+ ddebug_apply_class_bitmap(dcp, dcp->bits, ~0, modname);
+ ddebug_apply_class_bitmap(dcp, dcp->bits, 0, modname);
+}
+
+static void ddebug_match_apply_kparam(const struct kernel_param *kp,
+ const struct ddebug_class_map *map,
+ const char *modnm)
+{
+ struct ddebug_class_param *dcp;
+
+ if (kp->ops != ¶m_ops_dyndbg_classes)
+ return;
+
+ dcp = (struct ddebug_class_param *)kp->arg;
+
+ if (map == dcp->map) {
+ v2pr_info("found kp:%s =0x%lx", kp->name, *dcp->bits);
+ vpr_cm_info(map, "mapped to:");
+ ddebug_sync_classbits(dcp, modnm);
+ }
+}
+
+static void ddebug_apply_params(const struct ddebug_class_map *cm, const char *modnm)
+{
+ const struct kernel_param *kp;
+#if IS_ENABLED(CONFIG_MODULES)
+ int i;
+
+ if (cm->mod) {
+ vpr_cm_info(cm, "loaded class:");
+ for (i = 0, kp = cm->mod->kp; i < cm->mod->num_kp; i++, kp++)
+ ddebug_match_apply_kparam(kp, cm, modnm);
+ }
+#endif
+ if (!cm->mod) {
+ vpr_cm_info(cm, "builtin class:");
+ for (kp = __start___param; kp < __stop___param; kp++)
+ ddebug_match_apply_kparam(kp, cm, modnm);
+ }
+}
+
+/*
+ * Find this module's classmaps in a sub/whole-range of the builtin/
+ * modular classmap vector/section. Save the start and length of the
+ * subrange at its edges.
+ */
static void ddebug_attach_module_classes(struct ddebug_table *dt, struct _ddebug_info *di)
{
struct ddebug_class_map *cm;
int i, nc = 0;
- /*
- * Find this module's classmaps in a subrange/wholerange of
- * the builtin/modular classmap vector/section. Save the start
- * and length of the subrange at its edges.
- */
- for (cm = di->classes, i = 0; i < di->num_classes; i++, cm++) {
+ for (i = 0, cm = di->classes; i < di->num_classes; i++, cm++) {
if (!strcmp(cm->mod_name, dt->mod_name)) {
- if (!nc) {
- v2pr_info("start subrange, class[%d]: module:%s base:%d len:%d ty:%d\n",
- i, cm->mod_name, cm->base, cm->length, cm->map_type);
+ vpr_cm_info(cm, "classes[%d]:", i);
+ if (!nc++)
dt->classes = cm;
- }
- nc++;
}
}
- if (nc) {
- dt->num_classes = nc;
- vpr_info("module:%s attached %d classes\n", dt->mod_name, nc);
+ if (!nc)
+ return;
+
+ vpr_info("module:%s attached %d classes\n", dt->mod_name, nc);
+ dt->num_classes = nc;
+
+ for (i = 0, cm = dt->classes; i < dt->num_classes; i++, cm++)
+ ddebug_apply_params(cm, cm->mod_name);
+}
+
+/*
+ * propagates class-params thru their classmaps to class-users. this
+ * means a query against the dt/module, which means it must be on the
+ * list to be seen by ddebug_change.
+ */
+static void ddebug_attach_user_module_classes(struct ddebug_table *dt,
+ const struct _ddebug_info *di)
+{
+ struct ddebug_class_user *cli;
+ int i, nc = 0;
+
+ /*
+ * For builtins: scan the array, find start/length of this
+ * module's refs, save to dt. For loadables, this is the
+ * whole array.
+ */
+ for (i = 0, cli = di->class_users; i < di->num_class_users; i++, cli++) {
+
+ if (WARN_ON_ONCE(!cli || !cli->map || !cli->user_mod_name))
+ continue;
+
+ if (!strcmp(cli->user_mod_name, dt->mod_name)) {
+
+ vpr_cm_info(cli->map, "class_ref[%d] %s -> %s", i,
+ cli->user_mod_name, cli->map->mod_name);
+ if (!nc++)
+ dt->class_users = cli;
+ }
}
+ if (!nc)
+ return;
+
+ dt->num_class_users = nc;
+
+ /* now iterate dt */
+ for (i = 0, cli = dt->class_users; i < dt->num_class_users; i++, cli++)
+ ddebug_apply_params(cli->map, cli->user_mod_name);
+
+ vpr_dt_info(dt, "attach-client-module: ");
}
/*
@@ -1158,6 +1286,8 @@ static void ddebug_attach_module_classes(struct ddebug_table *dt, struct _ddebug
static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
{
struct ddebug_table *dt;
+ struct _ddebug *iter;
+ int i, class_ct = 0;
if (!di->num_descs)
return 0;
@@ -1181,13 +1311,20 @@ static int ddebug_add_module(struct _ddebug_info *di, const char *modname)
INIT_LIST_HEAD(&dt->link);
- if (di->classes && di->num_classes)
+ for (i = 0, iter = di->descs; i < di->num_descs; i++, iter++)
+ if (iter->class_id != _DPRINTK_CLASS_DFLT)
+ class_ct++;
+
+ if (class_ct && di->num_classes)
ddebug_attach_module_classes(dt, di);
mutex_lock(&ddebug_lock);
list_add_tail(&dt->link, &ddebug_tables);
mutex_unlock(&ddebug_lock);
+ if (class_ct && di->num_class_users)
+ ddebug_attach_user_module_classes(dt, di);
+
vpr_info("%3u debug prints in module %s\n", di->num_descs, modname);
return 0;
}
@@ -1337,8 +1474,10 @@ static int __init dynamic_debug_init(void)
struct _ddebug_info di = {
.descs = __start___dyndbg,
.classes = __start___dyndbg_classes,
+ .class_users = __start___dyndbg_class_users,
.num_descs = __stop___dyndbg - __start___dyndbg,
.num_classes = __stop___dyndbg_classes - __start___dyndbg_classes,
+ .num_class_users = __stop___dyndbg_class_users - __start___dyndbg_class_users,
};
#ifdef CONFIG_MODULES
diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c
index 9e950a911b6c..ff9b879286d5 100644
--- a/lib/test_dynamic_debug.c
+++ b/lib/test_dynamic_debug.c
@@ -6,11 +6,15 @@
* Jim Cromie <[email protected]>
*/
-#define pr_fmt(fmt) "test_dd: " fmt
+#if defined(TEST_DYNAMIC_DEBUG_SUBMOD)
+ #define pr_fmt(fmt) "test_dd_submod: " fmt
+#else
+ #define pr_fmt(fmt) "test_dd: " fmt
+#endif
#include <linux/module.h>
-/* run tests by reading or writing sysfs node: do_prints */
+/* re-gen output by reading or writing sysfs node: do_prints */
static void do_prints(void); /* device under test */
static int param_set_do_prints(const char *instr, const struct kernel_param *kp)
@@ -29,24 +33,39 @@ static const struct kernel_param_ops param_ops_do_prints = {
};
module_param_cb(do_prints, ¶m_ops_do_prints, NULL, 0600);
-/*
- * Using the CLASSMAP api:
- * - classmaps must have corresponding enum
- * - enum symbols must match/correlate with class-name strings in the map.
- * - base must equal enum's 1st value
- * - multiple maps must set their base to share the 0-30 class_id space !!
- * (build-bug-on tips welcome)
- * Additionally, here:
- * - tie together sysname, mapname, bitsname, flagsname
- */
-#define DD_SYS_WRAP(_model, _flags) \
- static unsigned long bits_##_model; \
- static struct ddebug_class_param _flags##_model = { \
+#define CLASSMAP_BITMASK(width, base) (((1UL << (width)) - 1) << base)
+
+/* sysfs param wrapper, proto-API */
+#define DYNDBG_CLASSMAP_PARAM_(_model, _flags, _init) \
+ static unsigned long bits_##_model = _init; \
+ static struct ddebug_class_param _flags##_##_model = { \
.bits = &bits_##_model, \
.flags = #_flags, \
.map = &map_##_model, \
}; \
- module_param_cb(_flags##_##_model, ¶m_ops_dyndbg_classes, &_flags##_model, 0600)
+ module_param_cb(_flags##_##_model, ¶m_ops_dyndbg_classes, \
+ &_flags##_##_model, 0600)
+#ifdef DEBUG
+#define DYNDBG_CLASSMAP_PARAM(_model, _flags) DYNDBG_CLASSMAP_PARAM_(_model, _flags, ~0)
+#else
+#define DYNDBG_CLASSMAP_PARAM(_model, _flags) DYNDBG_CLASSMAP_PARAM_(_model, _flags, 0)
+#endif
+
+/*
+ * Demonstrate/test all 4 class-typed classmaps with a sys-param.
+ *
+ * Each is 3 part: client-enum decl, _DEFINE, _PARAM.
+ * Declare them in blocks to show patterns of use (repetitions and
+ * changes) within each.
+ *
+ * 1st, dyndbg expects a client-provided enum-type as source of
+ * category/classid truth. DRM has DRM_UT_<CORE,DRIVER,KMS,etc>.
+ *
+ * Modules with multiple CLASSMAPS must have enums with distinct
+ * value-ranges, arranged below with explicit enum_sym = X inits.
+ *
+ * Declare all 4 enums now, for different types
+ */
/* numeric input, independent bits */
enum cat_disjoint_bits {
@@ -60,26 +79,51 @@ enum cat_disjoint_bits {
D2_LEASE,
D2_DP,
D2_DRMRES };
-DECLARE_DYNDBG_CLASSMAP(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, 0,
- "D2_CORE",
- "D2_DRIVER",
- "D2_KMS",
- "D2_PRIME",
- "D2_ATOMIC",
- "D2_VBL",
- "D2_STATE",
- "D2_LEASE",
- "D2_DP",
- "D2_DRMRES");
-DD_SYS_WRAP(disjoint_bits, p);
-DD_SYS_WRAP(disjoint_bits, T);
/* numeric verbosity, V2 > V1 related */
enum cat_level_num { V0 = 14, V1, V2, V3, V4, V5, V6, V7 };
-DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,
- "V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7");
-DD_SYS_WRAP(level_num, p);
-DD_SYS_WRAP(level_num, T);
+
+/* recapitulate DRM's parent(drm.ko) <-- _submod(drivers,helpers) */
+#if !defined(TEST_DYNAMIC_DEBUG_SUBMOD)
+/*
+ * In single user, or parent / coordinator (drm.ko) modules, define
+ * classmaps on the client enums above, and then declares the PARAMS
+ * ref'g the classmaps. Each is exported.
+ */
+DYNDBG_CLASSMAP_DEFINE(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS,
+ D2_CORE,
+ "D2_CORE",
+ "D2_DRIVER",
+ "D2_KMS",
+ "D2_PRIME",
+ "D2_ATOMIC",
+ "D2_VBL",
+ "D2_STATE",
+ "D2_LEASE",
+ "D2_DP",
+ "D2_DRMRES");
+
+DYNDBG_CLASSMAP_DEFINE(map_level_num, DD_CLASS_TYPE_LEVEL_NUM,
+ V0, "V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7");
+
+/*
+ * now add the sysfs-params
+ */
+
+DYNDBG_CLASSMAP_PARAM(disjoint_bits, p);
+DYNDBG_CLASSMAP_PARAM(level_num, p);
+
+#else /* TEST_DYNAMIC_DEBUG_SUBMOD */
+
+/*
+ * in submod/drm-drivers, use the classmaps defined in top/parent
+ * module above.
+ */
+
+DYNDBG_CLASSMAP_USE(map_disjoint_bits);
+DYNDBG_CLASSMAP_USE(map_level_num);
+
+#endif
/* stand-in for all pr_debug etc */
#define prdbg(SYM) __pr_debug_cls(SYM, #SYM " msg\n")
@@ -115,6 +159,7 @@ static void do_levels(void)
static void do_prints(void)
{
+ pr_debug("do_prints:\n");
do_cats();
do_levels();
}
diff --git a/lib/test_dynamic_debug_submod.c b/lib/test_dynamic_debug_submod.c
new file mode 100644
index 000000000000..9a893402ce1a
--- /dev/null
+++ b/lib/test_dynamic_debug_submod.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kernel module for testing dynamic_debug
+ *
+ * Authors:
+ * Jim Cromie <[email protected]>
+ */
+
+#define TEST_DYNAMIC_DEBUG_SUBMOD
+#include "test_dynamic_debug.c"
--
2.44.0
Treat comma as a token terminator, just like a space. This allows a
user to avoid quoting hassles when spaces are otherwise needed:
:#> modprobe drm dyndbg=class,DRM_UT_CORE,+p\;class,DRM_UT_KMS,+p
or as a boot arg:
drm.dyndbg=class,DRM_UT_CORE,+p # todo: support multi-query here
Given the many ways a boot-line +args can be assembled and then passed
in/down/around shell based tools, this may allow side-stepping all
sorts of quoting hassles thru those layers.
existing query format:
modprobe test_dynamic_debug dyndbg="class D2_CORE +p"
new format:
modprobe test_dynamic_debug dyndbg=class,D2_CORE,+p
Signed-off-by: Jim Cromie <[email protected]>
Co-developed-by: Łukasz Bartosik <[email protected]>
Signed-off-by: Łukasz Bartosik <[email protected]>
---
lib/dynamic_debug.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 31fd67597928..c1bc728cb050 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -290,6 +290,14 @@ static int ddebug_change(const struct ddebug_query *query,
return nfound;
}
+static char *skip_spaces_and_commas(const char *str)
+{
+ str = skip_spaces(str);
+ while (*str == ',')
+ str = skip_spaces(++str);
+ return (char *)str;
+}
+
/*
* Split the buffer `buf' into space-separated words.
* Handles simple " and ' quoting, i.e. without nested,
@@ -303,8 +311,8 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
while (*buf) {
char *end;
- /* Skip leading whitespace */
- buf = skip_spaces(buf);
+ /* Skip leading whitespace and comma */
+ buf = skip_spaces_and_commas(buf);
if (!*buf)
break; /* oh, it was trailing whitespace */
if (*buf == '#')
@@ -320,7 +328,7 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
return -EINVAL; /* unclosed quote */
}
} else {
- for (end = buf; *end && !isspace(*end); end++)
+ for (end = buf; *end && !isspace(*end) && *end != ','; end++)
;
if (end == buf) {
pr_err("parse err after word:%d=%s\n", nwords,
@@ -592,7 +600,8 @@ static int ddebug_exec_queries(char *query, const char *modname)
if (split)
*split++ = '\0';
- query = skip_spaces(query);
+ query = skip_spaces_and_commas(query);
+
if (!query || !*query || *query == '#')
continue;
--
2.44.0
On Mon, Apr 29, 2024 at 1:32 PM Jim Cromie <[email protected]> wrote:
>
> hi Greg, Jason, DRM-folk,
>
> This patchset fixes the CONFIG_DRM_USE_DYNAMIC_DEBUG=y regression,
> Fixes: bb2ff6c27bc9 ("drm: Disable dynamic debug as broken")
>
> this is v8.
> Its also here:
> https://github.com/jimc/linux/tree/dd-classmap-fix-8a
>
This patchset didnt get picked up by drm patchwork
maybe its tired my stochastic renaming, sorry about that
https://patchwork.freedesktop.org/project/intel-gfx/series/?ordering=-last_updated
125063fix DRM_USE_DYNAMIC_DEBUG=y
[email protected]
123572fix DRM_USE_DYNAMIC_DEBUG
[email protected]
113363fix DRM_USE_DYNAMIC_DEBUG regressionwarningIn progress
[email protected]
111651DRM_USE_DYNAMIC_DEBUG
[email protected]
111631DRM - avoid regression in -rc, fix comment
is there something missing for a DRM patchwork run ?
does it kick out because theres non-drm subsystem stuff in there ?
thanks
> v7 had at least 2 problems:
>
> https://lore.kernel.org/lkml/[email protected]/
> https://patchwork.freedesktop.org/series/125066/
>
> 1. missing __align(8) in METATDATA macro, giving too much placement
> freedom to linker, caused weird segvs following non-ptr vals, but for
> builtin modules only. found by lkp-test.
>
> 2. the main patch changed both the dyndbg API, and the drm/drivers.
> This was a flag-day annoyance, and not practical. Fix by preserving
> old API macro until "later", and splitting the patch and set into 2
> sequential subsets. removal can wait.
>
> What was broken ?
>
> Booting a modular kernel with drm.debug=0x1ff, this enabled pr_debugs
> only in drm itself, not the yet-to-be loaded driver + helpers. I had
> tested with scripts doing lots of modprobes with dyndbg=<> options
> permuting. I didn't notice that I didn't really test without them.
>
> The deeper cause was my design error, a violation of the K&R rule:
> "define once, refer many times".
>
> DECLARE_DYNDBG_CLASSMAP defined the classmap, and was used everywhere,
> re-declaring the same static classmap repeatedly. Jani Nikula actually
> picked up on this at the time, but didn't scream loudly enough for
> anyone to notice, I know I didn't get it then. One patchset across 2
> trees didn't help either.
>
> The revised classmap API "splits" it to def & ref.
>
> DYNDBG_CLASSMAP_DEFINE fixes & updates the busted macro, EXPORTing the
> classmap instead. It gets invoked once per subsystem, by the
> parent/builtin, drm.ko for DRM.
>
> DYNDBG_CLASSMAP_USE in drivers and helpers refer to the classmap by
> name, which links the 2 modules (like __drm_debug already does).
>
> These 2 tell dyndbg to map "class FOO" to the defined FOO_ID, which
> allows it to make those changes via >control.
>
> DYNDBG_CLASSMAP_PARAM*, defines the controlling kparam, and binds it
> to both the _var, and the _DEFINEd classmap. So drm uses this to bind
> the classmap to __drm_debug.
>
> It provides the common control-point for the sub-system; it is applied
> to the classmaps during modprobe of both _DEFINEr and USErs. It also
> enforces the relative nature of LEVEL classmaps, ie V3>V2.
>
> DECLARE_DYNDBG_CLASSMAP is preserved to decouple the DRM patches.
>
> A new struct and elf section contain the _USEs; on modprobe, these are
> scanned similarly to the _DEFINEs, but follow the references to their
> defining modules, find the kparam wired to the classmap, and apply its
> classmap settings to the USEr. This action is what V1 missed, which
> is why drivers failed to enable debug during modprobe.
>
> In order to recapitulate the regression scenario without involving
> DRM, the patchset (v6 I think) adds test_dynamic_debug_submod, which
> is a duplicate of its parent; _submod.c #defines _SUBMOD, and then
> includes parent.
>
> This puts _DEFINE and _USE close together in the same file, for
> obviousness. It also guarantees that the submod always has the same
> complement of debug()s, giving consistent output from both when
> classmaps are working properly, as tested when changing callsites via
> both param and >control.
>
> To provide a turn-key selftest, the patchset also adds
> ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh, pilfered
> from a debug-to-trace patchset I and Lukasz Bartozik have been working
> out. It starts with basic_tests, then to test 2 new parsing
> delimiters, which simplify testing of the classmap functionality.
>
> It works nicely from virtme-ng:
>
> [jimc@frodo vx]$ vrun_ -- ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
> doing: vng --verbose --name v6.9-rc5-34-g2f1ace6e1c68 \
> --user root --cwd ../.. \
> -a dynamic_debug.verbose=2 -p 4 \
> -- ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
> virtme: waiting for virtiofsd to start
> ...
> [ 3.546739] ip (260) used greatest stack depth: 12368 bytes left
> [ 3.609288] virtme-init: starting script
> test_dynamic_debug_submod not there
> test_dynamic_debug not there
> # BASIC_TESTS
> ...
> # Done on: Fri Apr 26 20:45:08 MDT 2024
> [ 4.765751] virtme-init: script returned {0}
> Powering off.
> [ 4.805790] ACPI: PM: Preparing to enter system sleep state S5
> [ 4.806223] kvm: exiting hardware virtualization
> [ 4.806564] reboot: Power down
> [jimc@frodo vx]$
>
>
> I've been running the kernel on my x86 desktop & laptop, booting with
> drm.debug=0x1f, then turning it all-off after sleep 15.
>
> a few highlights from a bare-metal boot:
>
> here modprobe amdgpu; dyndbg applies last bit/class/category, and finishes init,
> then drm and amdgpu start logging as they execute
> ...
> [ 9.019696] gandalf kernel: dyndbg: query 0: "class DRM_UT_ATOMIC +p" mod:amdgpu
> [ 9.019704] gandalf kernel: dyndbg: class-ref: amdgpu.DRM_UT_ATOMIC module:amdgpu nd:4754 nc:0 nu:1
> [ 9.020012] gandalf kernel: dyndbg: processed 1 queries, with 21 matches, 0 errs
> [ 9.020017] gandalf kernel: dyndbg: bit_4: 21 matches on class: DRM_UT_ATOMIC -> 0x1f
> [ 9.020021] gandalf kernel: dyndbg: applied bitmap: 0x1f to: 0x0 for amdgpu
> [ 9.020026] gandalf kernel: dyndbg: attach-client-module: module:amdgpu nd:4754 nc:0 nu:1
> [ 9.020031] gandalf kernel: dyndbg: 4754 debug prints in module amdgpu
> [ 9.055065] gandalf kernel: [drm] amdgpu kernel modesetting enabled.
> [ 9.055138] gandalf kernel: [drm:amdgpu_acpi_detect [amdgpu]] No matching acpi device found for AMD3000
> [ 9.055564] gandalf kernel: amdgpu: Virtual CRAT table created for CPU
> [ 9.055585] gandalf kernel: amdgpu: Topology: Add CPU node
> [ 9.055752] gandalf kernel: amdgpu 0000:0c:00.0: enabling device (0006 -> 0007)
> [ 9.055821] gandalf kernel: [drm] initializing kernel modesetting (NAVI10 0x1002:0x731F 0x148C:0x2398 0xC1).
> [ 9.055835] gandalf kernel: [drm] register mmio base: 0xFCB00000
> [ 9.055839] gandalf kernel: [drm] register mmio size: 524288
> [ 9.059148] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] number of dies: 1
> [ 9.059387] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] number of hardware IPs on die0: 39
> [ 9.059623] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] ATHUB(35) #0 v2.0.0:
> [ 9.059856] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] 0x00000c00
> [ 9.060096] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] 0x02408c00
> [ 9.060328] gandalf kernel: [drm:amdgpu_discovery_set_ip_blocks [amdgpu]] set register base offset for ATHUB
>
> a startup script, after sleep 15, turns off the logging:
>
> echo 0 > /sys/module/drm/parameters/debug
>
> heres 1st 2 bits/classes/categories being turned off:
>
> [ 29.105991] gandalf kernel: [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 90752, wptr 90784
> [ 29.118086] gandalf kernel: dyndbg: bits:0x0 > *.debug
> [ 29.118096] gandalf kernel: dyndbg: apply bitmap: 0x0 to: 0x1f for '*'
> [ 29.118102] gandalf kernel: dyndbg: query 0: "class DRM_UT_CORE -p" mod:*
> [ 29.118122] gandalf kernel: dyndbg: good-class: drm.DRM_UT_CORE module:drm nd:338 nc:1 nu:0
> [ 29.119548] gandalf kernel: dyndbg: class-ref: drm_kms_helper.DRM_UT_CORE module:drm_kms_helper nd:93
> nc:0 nu:1
> [ 29.119552] gandalf kernel: dyndbg: class-ref: drm_display_helper.DRM_UT_CORE module:drm_display_helper nd:151 nc:0 nu:1
> [ 29.119737] gandalf kernel: dyndbg: class-ref: amdgpu.DRM_UT_CORE module:amdgpu nd:4754 nc:0 nu:1
> [ 29.122181] gandalf kernel: [drm:amdgpu_ih_process [amdgpu]] amdgpu_ih_process: rptr 90784, wptr 90816
> [ 29.127687] gandalf kernel: dyndbg: processed 1 queries, with 466 matches, 0 errs
> [ 29.127690] gandalf kernel: dyndbg: bit_0: 466 matches on class: DRM_UT_CORE -> 0x0
> [ 29.127692] gandalf kernel: dyndbg: query 0: "class DRM_UT_DRIVER -p" mod:*
> [ 29.127696] gandalf kernel: dyndbg: good-class: drm.DRM_UT_DRIVER module:drm nd:338 nc:1 nu:0
> [ 29.127699] gandalf kernel: dyndbg: class-ref: drm_kms_helper.DRM_UT_DRIVER module:drm_kms_helper nd:93 nc:0 nu:1
> [ 29.127701] gandalf kernel: dyndbg: class-ref: drm_display_helper.DRM_UT_DRIVER module:drm_display_helper nd:151 nc:0 nu:1
> [ 29.127885] gandalf kernel: dyndbg: class-ref: amdgpu.DRM_UT_DRIVER module:amdgpu nd:4754 nc:0 nu:1
> [ 29.152925] gandalf kernel: dyndbg: processed 1 queries, with 1384 matches, 0 errs
>
>
> The resulting journal is ~14.6k lines, written in the 1st 15 (29)
> seconds of startup. I'm unsure what the 15/29 discrepancy might
> indicate/betray, besides a lot of logging work. sleep 15 is not the
> best stopwatch.
>
> recent spins thru lkp-test have also been SUCCESS-ful.
>
> Jim Cromie (35):
>
> old-bugs & cleanups:
> dyndbg: fix old BUG_ON in >control parser
> docs/dyndbg: update examples \012 to \n
> test-dyndbg: fixup CLASSMAP usage error
> dyndbg: reword "class unknown," to "class:_UNKNOWN_"
> dyndbg: make ddebug_class_param union members same size
> dyndbg: replace classmap list with a vector
> dyndbg: ddebug_apply_class_bitmap - add module arg, select on it
> dyndbg: split param_set_dyndbg_classes to _module & wrapper fns
> dyndbg: drop NUM_TYPE_ARRAY
> dyndbg: reduce verbose/debug clutter
> dyndbg: silence debugs with no-change updates
> dyndbg: tighten ddebug_class_name() 1st arg type
> dyndbg: tighten fn-sig of ddebug_apply_class_bitmap
> dyndbg: reduce verbose=3 messages in ddebug_add_module
> dyndbg-API: remove DD_CLASS_TYPE_(DISJOINT|LEVEL)_NAMES and code
>
> core fix & selftests:
> dyndbg-API: fix DECLARE_DYNDBG_CLASSMAP
> selftests-dyndbg: add tools/testing/selftests/dynamic_debug/*
> selftests-dyndbg: exit 127 if no facility
> dyndbg-API: promote DYNDBG_CLASSMAP_PARAM to API
> dyndbg-doc: add classmap info to howto
> dyndbg: treat comma as a token separator
> selftests-dyndbg: add comma_terminator_tests
> dyndbg: split multi-query strings with %
> selftests-dyndbg: test_percent_splitting multi-cmds on module classes
> docs/dyndbg: explain new delimiters: comma, percent
> selftests-dyndbg: add test_mod_submod
> selftests-dyndbg: test dyndbg-to-tracefs
> dyndbg-doc: explain flags parse 1st
> dyndbg: add __counted_by annotations
>
> DRM parts
> drm+drivers: adapt to use DYNDBG_CLASSMAP_{DEFINE,USE}
> drm-dyndbg: adapt to use DYNDBG_CLASSMAP_PARAM
> drm: use correct ccflags-y spelling
> drm-drivers: DRM_CLASSMAP_USE in 2nd batch of drivers, helpers
> drm: restore CONFIG_DRM_USE_DYNAMIC_DEBUG un-BROKEN
> drm-print: workaround compiler meh
>
> .../admin-guide/dynamic-debug-howto.rst | 99 ++-
> MAINTAINERS | 3 +-
> drivers/gpu/drm/Kconfig | 3 +-
> drivers/gpu/drm/Makefile | 3 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 12 +-
> drivers/gpu/drm/display/drm_dp_helper.c | 12 +-
> drivers/gpu/drm/drm_crtc_helper.c | 12 +-
> drivers/gpu/drm/drm_gem_shmem_helper.c | 2 +
> drivers/gpu/drm/drm_print.c | 38 +-
> drivers/gpu/drm/gud/gud_drv.c | 2 +
> drivers/gpu/drm/i915/i915_params.c | 12 +-
> drivers/gpu/drm/mgag200/mgag200_drv.c | 2 +
> drivers/gpu/drm/nouveau/nouveau_drm.c | 12 +-
> drivers/gpu/drm/qxl/qxl_drv.c | 2 +
> drivers/gpu/drm/radeon/radeon_drv.c | 2 +
> drivers/gpu/drm/udl/udl_main.c | 2 +
> drivers/gpu/drm/vkms/vkms_drv.c | 2 +
> drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 2 +
> include/asm-generic/vmlinux.lds.h | 1 +
> include/drm/drm_print.h | 10 +
> include/linux/dynamic_debug.h | 130 ++-
> kernel/module/main.c | 3 +
> lib/Kconfig.debug | 24 +-
> lib/Makefile | 3 +
> lib/dynamic_debug.c | 443 ++++++----
> lib/test_dynamic_debug.c | 131 +--
> lib/test_dynamic_debug_submod.c | 17 +
> tools/testing/selftests/Makefile | 1 +
> .../testing/selftests/dynamic_debug/Makefile | 9 +
> tools/testing/selftests/dynamic_debug/config | 2 +
> .../dynamic_debug/dyndbg_selftest.sh | 765 ++++++++++++++++++
> 31 files changed, 1398 insertions(+), 363 deletions(-)
> create mode 100644 lib/test_dynamic_debug_submod.c
> create mode 100644 tools/testing/selftests/dynamic_debug/Makefile
> create mode 100644 tools/testing/selftests/dynamic_debug/config
> create mode 100755 tools/testing/selftests/dynamic_debug/dyndbg_selftestsh
>
> --
> 2.44.0
>