On Sun, Sep 04, 2022 at 03:07:46PM +0300, Govindapillai, Vinod wrote:
> On Thu, 2022-09-01 at 13:11 +0300, Stanislav Lisovskiy wrote:
> > Whenever we are not able to get enough timeslots
> > for required PBN, let's try to allocate those
> > using DSC, just same way as we do for SST.
> >
> > v2: Re
== Series Details ==
Series: DYNDBG: opt-in class'd debug for modules, use in drm. (rev4)
URL : https://patchwork.freedesktop.org/series/106427/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_12068_full -> Patchwork_106427v4_full
On 9/4/2022 12:29 AM, Usyskin, Alexander wrote:
+static void pxp_is_ready(struct mei_cl_device *cldev)
+{
+ struct mei_device *bus = cldev->bus;
+
+ switch (bus->pxp_mode) {
+ case MEI_DEV_PXP_READY:
+ case MEI_DEV_PXP_DEFAULT:
+ cldev->do_match = 1;
Can
== Series Details ==
Series: DYNDBG: opt-in class'd debug for modules, use in drm. (rev4)
URL : https://patchwork.freedesktop.org/series/106427/
State : success
== Summary ==
CI Bug Log - changes from CI_DRM_12068 -> Patchwork_106427v4
Summ
== Series Details ==
Series: DYNDBG: opt-in class'd debug for modules, use in drm. (rev4)
URL : https://patchwork.freedesktop.org/series/106427/
State : warning
== Summary ==
Error: dim sparse failed
Sparse version: v0.6.2
Fast mode used, each commit won't be checked separately.
== Series Details ==
Series: DYNDBG: opt-in class'd debug for modules, use in drm. (rev4)
URL : https://patchwork.freedesktop.org/series/106427/
State : warning
== Summary ==
Error: dim checkpatch failed
d762077fcfcf dyndbg: fix static_branch manipulation
b01666fdf992 dyndbg: fix module.dyndbg
Add static int is_dyndbg_header(d), which verifies that the arg is
initialized as expected; that it points to the _ddebug_hdr &
_ddebug_site_hdr records initialized by DYNAMIC_DEBUG_TABLE().
That init macro sets the _uplink fields in the 2 records to point at
each other. This is an impossible sit
---
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 059212df68f9..65b0a1025ddf 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1547,7 +1547,7 @@ static int __init dynamic_debug_init(void)
Count de-duplicated callsites. Since the _ddebug_site excludes
lineno, all callsites in a function are identical, and this
effectively counts functions in the module with callsites.
Signed-off-by: Jim Cromie
---
lib/dynamic_debug.c | 11 +--
1 file changed, 5 insertions(+), 6 deletions(
attempt container-of, broken, missing use of uplink... took that out.
ptr computations are naive, and wrong.
Deeper prob is lack of _ddebug_vec, with header and descs in same struct.
maybe.
builtin_state looks right in debugger
---
lib/dynamic_debug.c | 21 +++--
1 file changed,
For a long time now, loadable modules have tacitly linked the __dyndbg
section into the .ko, as is observable in dmesg by enabling module.c's
pr_debugs and loading a module. Recently, __dyndbg_sites was added,
following the original model.
But now, we need to explicitly name those (__dyndbg, __dy
We now have 2 vectors of data: (__dyndbg, __dyndbg_sites), known to be
equal-length, with _ddebug.site connecting them, like rungs on a
ladder. In order to drop _ddebug.site, we need to replace the
absolute ptr with a cheap relative-address computation:
struct _ddebug_site *site = _ddebug_map_
STATUS:
broken with some over-free, punt and comment out late_initcall
Implement dymamic_debug_sites_reclaim(as a late_initcall) to free the
tail~47% of the builtin __dyndbg_sites[] vector back to the buddy
allocator. Code is copied from mm/init.c:free_initmem(), wo the
poisoning. Comments carg
In __ddebug_add_module(), detect repeated site records (by function
name changes), and push changes onto the stack/vector passed in
from dynamic_debug_init().
For ddebug_add_module(), this transparently de-duplicates the local
sites vector (passed in recently added stack-base, and offset 0).
Sign
Add linker symbols and KEEPs for .gnu.linkonce.dyndbg and
.gnu.linkonce.dyndbg_sites sections, placing them in front of their
respective dyndbg and dyndbg_sites sections.
This placement gives us a known relative offset (ie -1) from the start
of the vector to the header, letting us use container_of
drm_print.c calls pr_debug() just once, from __drm_printfn_debug(),
which is a generic/service fn. The callsite is compile-time enabled
by DEBUG in both DYNAMIC_DEBUG=y/n builds.
For dyndbg builds, reverting this callsite back to bare printk is
correcting a few anti-features:
1- callsite is gene
struct _ddebug.lineno int:18 is bigger than we need:
git ls-files | grep -P '\.c$' | xargs wc -l | sort -n | tail -n20
...
22553 drivers/scsi/lpfc/lpfc_sli.c
28593 drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c
46300 drivers/net/wireless/realtek/rtw88/rtw8822c_table.c
my test scripts were writing one val, reading back val+1
echo L3 > p_level_names
cat p_level_names
L4
fix this w a -1 offset.
Signed-off-by: Jim Cromie
---
lib/dynamic_debug.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 11fea1f818
change drm_dev_dbg & drm_dbg to macros, which forward to the renamed
functions (with __ prefix added).
Those functions sit below the categorized layer of macros implementing
the DRM debug.category API, and implement most of it. These are good
places to insert dynamic-debug jump-label mechanics, w
Struct _ddebug has 3 RO-data fields: _module, _file, _function, which
have significant repetition in the builtins: 4222 unique records /
8920 callsites on a recent laptop build. Thats just 47% unique, on
24/56 of the unitary record.
The quick path to excising this redundancy is:
1- split the tab
Add new structs _ddebug_hdr and _ddebug_site_hdr, latter for symmetry.
The job of the struct _ddebug_hdr is to:
Contain an _uplink member, which points up to the _ddebug_info
record that keeps builtin and module's dyndbg state. That record is
init'd (by dynamic_debug_init for builtins, or find_m
In order to actually reclaim useful blocks of memory, we need to
repack the vector of redundant site recs, not just detect the
duplicates. To allow this, extend __ddebug_add_module()s prototype by
adding:
struct _ddebug_site *packed_sites - address of empty "stack"
unsigned int *packed_base
The next patch adds DEFINE_DYNAMIC_DEBUG_TABLE(), which broke several
subtrees, including efi, vdso, and some of arch/*/boot/compressed,
with various relocation errors, iirc.
Avoid those problems by adding a define to suppress the "transparent"
DEFINE_DYNAMIC_DEBUG_TABLE() invocation. I found the
Add kernel_param_ops and callbacks to use a class-map to validate and
apply input to a sysfs-node, which allows users to control classes
defined in that class-map. This supports uses like:
echo 0x3 > /sys/module/drm/parameters/debug
IE add these:
- int param_set_dyndbg_classes()
- int param
These 2 macros formerly used dev_info, and they still check
subdev->debug to gate the printing. So dyndbg control is redundant
ATM (and possibly confusing, since its off by default).
prdbg count is up from 3, or from 65 (with VMM_DEBUG here)
[7.765379] dyndbg: 516 debug prints in module nouv
---
lib/dynamic_debug.c | 15 ---
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 41c23ec979f4..059212df68f9 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1347,7 +1347,7 @@ static int __ddebug_add_module(str
The .data table built of struct _ddebug[]s has about 40% repetition in
the "decorator" fields: modname, function, filename. The real fix is
to "normalize the db", but 1st we need a layer of accessor macros,
giving us just one field deref to alter later.
So:
define 3 field-abstraction macros: des
drm_print defines all of these:
drm_dbg_{core,kms,prime,atomic,vbl,lease,_dp,_drmres}
but not drm_dbg_driver itself, since it was the original drm_dbg.
To improve namespace symmetry, change the drm_dbg defn to
drm_dbg_driver, and redef grandfathered name to symmetric one.
This will help with
This defines a new macro (tbd: tweak name) which is a special version
of DEFINE_DYNAMIC_DEBUG_METADATA_CLS(). Unlike that macro, which
declares callsites in pairs of desc/site recs.
This macro declares a pair of header records, which the linker script
then places once (.gnu.linkonce.) into the fr
ddebug_trace() currently issues a single printk:console event.
Replace that, adding include/trace/events/dyndbg.h, which defines 2
new events:
- dyndbg:prdbg - from trace_prdbg() - if !dev
- dyndbg:devdbg - from trace_devdbg() - if !!dev
This links the legacy pr_debug API to tracefs, via dyndbg
clone DRM.debug interface to DRM.tracebits: ie map bits to
drm-debug-categories, except this interface enables messages to
tracefs, not to syslog.
1- we reuse the class-map added previously.
this reflects the single source of both syslog/trace events
2- add a 2nd struct ddebug_classes_bitmap_p
add new flag, and OR it into _DPRINTK_FLAGS_ENABLED definition
CC: vincent.whitchu...@axis.com
Signed-off-by: Jim Cromie
---
include/linux/dynamic_debug.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index ec
adds: ddebug_trace()
uses trace_console() temporarily to issue printk:console event
uses internal-ish __ftrace_trace_stack code:
4-context buffer stack, barriers per Steve Rostedt
call it from new funcs:
ddebug_printk() - print to both syslog/tracefs
ddebug_dev_printk() - dev-print to
DRM issues ~10 exclusive categories of debug messages; to represent
this directly in dyndbg, add a new 6-bit field: struct _ddebug.class_id.
This gives us 64 classes, which should be more than enough.
#> echo 0x012345678 > /sys/module/drm/parameters/debug
All existing callsites are initialized
clone the nvkm_printk,_,__ macro ladder into nvkm_drmdbg,_,__.
And alter the debug, trace, spam macros to use the renamed ladder.
This *sets-up* (not done yet) to remove the _subdev->debug >= (l)
condition, once the bitmap-param is wired up correctly, and figured
into dyndbg's jump-label enablemen
Distinguish the condition: _DPRINTK_FLAGS_ENABLED from the bit:
_DPRINTK_FLAGS_PRINT, and re-define former in terms of latter, in
preparation to add a 2nd bit: _DPRINTK_FLAGS_TRACE
Update JUMP_LABEL code block to check _DPRINTK_FLAGS_ENABLED symbol.
Also add a 'K' to get new symbol _DPRINTK_FLAGS_
lkp robot told me:
>> drivers/gpu/drm/drm_ioc32.c:989:2:
error: call to undeclared function '_dynamic_func_call_cls';
ISO C99 and later do not support implicit function declarations
[-Wimplicit-function-declaration]
DRM_DEBUG("comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, %s\n",
Si
upgrade the callchain to drm_dbg() and drm_dev_dbg(); add a struct
_ddebug ptr parameter to them, and supply that additional param by
replacing the '_no_desc' flavor of dyndbg Factory macro currently used
with the flavor that supplies the descriptor.
NOTES:
The descriptor gives these fns access t
These 2 macros used drm_debug_enabled() on DRM_UT_{DRIVER,ATOMIC}
respectively, replace those with drm_dbg_##cat invocations.
this results in new class'd prdbg callsites:
:#> grep nouveau /proc/dynamic_debug/control | grep class | wc
1161130 15584
:#> grep nouveau /proc/dynamic_debug/co
Add __dyndbg_classes section, using __dyndbg as a model. Use it:
vmlinux.lds.h:
KEEP the new section, which also silences orphan section warning on
loadable modules. Add (__start_/__stop_)__dyndbg_classes linker
symbols for the c externs (below).
kernel/module/main.c:
- fill new fields in find_
For CONFIG_DRM_USE_DYNAMIC_DEBUG=y, wrap __drm_dbg() & __drm_dev_dbg()
in one of dyndbg's Factory macros: _dynamic_func_call_no_desc().
This adds the callsite descriptor into the code, and an entry for each
into /proc/dynamic_debug/control.
#> echo class DRM_UT_ATOMIC +p > /proc/dynamic_debug/c
Recently added ddebug_trace() issues a single printk:console event.
Replace that event with 2 new ones, defined in a new header:
include/trace/events/dyndbg.h
- dyndbg:prdbg - from trace_prdbg() - if !dev
- dyndbg:devdbg - from trace_devdbg() - if !!dev
This links the legacy pr_debug API to tra
Add module-to-class validation:
#> echo class DRM_UT_KMS +p > /proc/dynamic_debug/control
If a query has "class FOO", then ddebug_find_valid_class(), called
from ddebug_change(), requires that FOO is known to module X,
otherwize the query is skipped entirely for X. This protects each
module's
This exported fn is unused, and will not be needed. Lets dump it.
The export was added to let drm control pr_debugs, as part of using
them to avoid drm_debug_enabled overheads. But its better to just
implement the drm.debug bitmap interface, then its available for
everyone.
Fixes: a2d375eda771 (
enum drm_debug_category has 10 categories, but is initialized with
bitmasks which require 10 bits of underlying storage. By using
natural enumeration, and moving the BIT(cat) into drm_debug_enabled(),
the enum fits in 4 bits, allowing the category to be represented
directly in pr_debug callsites,
Add an explanation of the new "class CLASS_NAME" syntax and meaning,
noting that the module determines if CLASS_NAME applies to it.
Signed-off-by: Jim Cromie
---
Documentation/admin-guide/dynamic-debug-howto.rst | 11 +++
1 file changed, 11 insertions(+)
diff --git a/Documentation/admin
dyndbg's control-parser: ddebug_parse_query(), requires that search
terms: module, func, file, lineno, are used only once in a query; a
thing cannot be named both foo and bar.
The cited commit added an overriding module modname, taken from the
module loader, which is authoritative. So it set quer
Using DECLARE_DYNDBG_CLASSMAP, modules can declare up to 31 classnames.
By doing so, they authorize dyndbg to manipulate class'd prdbgs (ie:
__pr_debug_cls, and soon drm_*dbg), ala::
:#> echo class DRM_UT_KMS +p > /proc/dynamic_debug/control
The macro declares and initializes a static struct d
Use DECLARE_DYNDBG_CLASSMAP across DRM:
- in .c files, since macro defines/initializes a record
- in drivers, $mod_{drv,drm,param}.c
ie where param setup is done, since a classmap is param related
- in drm/drm_print.c
since existing __drm_debug param is defined there,
and we ifdef it
Walk the module's vector of callsites backwards; ie N..0. This
"corrects" the backwards appearance of a module's prdbg vector when
walked 0..N. I think this is due to linker mechanics, which I'm
inclined to treat as immutable, and the order is fixable in display.
No functional changes.
Combined
In order to use dynamic-debug's jump-label optimization in drm-debug,
its clarifying to refine drm_debug_enabled into 3 uses:
1. drm_debug_enabled - legacy, public
2. __drm_debug_enabled - optimized for dyndbg jump-label enablement.
3. _drm_debug_enabled - pr_debug instrumented, observable
1.
Rework/modernize docs:
- use /proc/dynamic_debug/control in examples
its *always* there (when dyndbg is config'd), even when is not.
drop talk, its a distraction here.
- alias ddcmd='echo $* > /proc/dynamic_debug/control
focus on args: declutter, hide boilerplate, make pwd independen
Demonstrate use of DECLARE_DYNDBG_CLASSMAP macro, and expose them as
sysfs-nodes for testing.
For each of the 4 class-map-types:
- declare a class-map of that type,
- declare the enum corresponding to those class-names
- share _base across 0..30 range
- add a __pr_debug_cls() call for eac
Add ddebug_attach_module_classes(), call it from ddebug_add_module().
It scans the classes/section its given, finds records where the
module-name matches the module being added, and adds them to the
module's maps list. No locking here, since the record
isn't yet linked into the ddebug_tables list.
For selftest purposes, add __pr_debug_cls(class, fmt, ...)
I didn't think we'd need to define this, since DRM effectively has it
already in drm_dbg, drm_devdbg. But test_dynamic_debug needs it in
order to demonstrate all the moving parts.
Note the __ prefix; its not intended for general use, at
`cat control` currently does octal escape, so '\n' becomes "\012".
Change this to display as "\n" instead, which reads much cleaner.
:#> head -n7 /proc/dynamic_debug/control
# filename:lineno [module]function flags format
init/main.c:1179 [main]initcall_blacklist =_ "blacklisting initcall
This new struct composes the linker provided (vector,len) section,
and provides a place to add other __dyndbg[] state-data later:
descs - the vector of descriptors in __dyndbg section.
num_descs - length of the data/section.
Use it, in several different ways, as follows:
In lib/dynamic_debug
print "old => new" flag values to the info("change") message.
no functional change.
Acked-by: Jason Baron
Signed-off-by: Jim Cromie
---
lib/dynamic_debug.c | 11 ++-
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index a56c1286ff
Provide a simple module to allow testing DYNAMIC_DEBUG behavior. It
calls do_prints() from module-init, and with a sysfs-node.
dmesg -C
dmesg -w &
modprobe test_dynamic_debug dyndbg=+p
echo 1 > /sys/module/dynamic_debug/parameters/verbose
cat /sys/module/test_dynamic_debug/parameters/d
rework var-names for clarity, regularity
rename variables
- n to mod_sites - it counts sites-per-module
- entries to i - display only
- iter_start to iter_mod_start - marks start of each module's subrange
- modct to mod_ct - stylistic
new iterator var:
- site - cursor parallel to iter
For CONFIG_DYNAMIC_DEBUG=N, the ddebug_dyndbg_module_param_cb()
stub-fn is too permissive:
bash-5.1# modprobe drm JUNKdyndbg
bash-5.1# modprobe drm dyndbgJUNK
[ 42.933220] dyndbg param is supported only in CONFIG_DYNAMIC_DEBUG builds
[ 42.937484] ACPI: bus type drm_connector registered
This c
/proc/dynamic_debug/control walks the prdbg catalog in "reverse",
fix this by adding new ddebug_tables to tail of list.
This puts init/main.c entries 1st, which looks more than coincidental.
no functional changes.
Acked-by: Jason Baron
Signed-off-by: Jim Cromie
---
lib/dynamic_debug.c | 2 +-
In https://lore.kernel.org/lkml/20211209150910.ga23...@axis.com/
Vincent's patch commented on, and worked around, a bug toggling
static_branch's, when a 2nd PRINTK-ish flag was added. The bug
results in a premature static_branch_disable when the 1st of 2 flags
was disabled.
The cited commit comp
hi Greg, Jason, DRM-folk, Steven,
If Im not too late for linux-next in this cycle, heres V6. Diffs are minor:
- rebased onto e47eb90a0a9a (tag: next-20220901, linux-next/master)
gets past Kconfig conflict, same for drm-tip.
- uint debug_level, not ulong. to fit nouveau.
- -1 on param-read
On Thu, 2022-09-01 at 13:11 +0300, Stanislav Lisovskiy wrote:
> Whenever we are not able to get enough timeslots
> for required PBN, let's try to allocate those
> using DSC, just same way as we do for SST.
>
> v2: Removed intel_dp_mst_dsc_compute_config and refactored
> intel_dp_dsc_compute_co
Reviewed-by: Vinod Govindapillai
Vinod
On Thu, 2022-09-01 at 13:11 +0300, Stanislav Lisovskiy wrote:
> We would be using almost same code to loop through bpps while calling
> drm_dp_atomic_find_vcpi_slots - lets remove this duplication by
> introducing a new function intel_dp_mst_find_vcpi_slots
> > +static void pxp_is_ready(struct mei_cl_device *cldev)
> > +{
> > + struct mei_device *bus = cldev->bus;
> > +
> > + switch (bus->pxp_mode) {
> > + case MEI_DEV_PXP_READY:
> > + case MEI_DEV_PXP_DEFAULT:
> > + cldev->do_match = 1;
>
> Can you explain why you set do_match = 1
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