[PATCH v6 02/11] dyndbg: add DEFINE_DYNAMIC_DEBUG_CATEGORIES and callbacks
Jim Cromie
jim.cromie at gmail.com
Sun Aug 22 22:20:00 UTC 2021
DEFINE_DYNAMIC_DEBUG_CATEGORIES(name, var, bitmap_desc, @bit_descs)
allows users to define a drm.debug style (bitmap) sysfs interface, and
to specify the desired mapping from bits[0-N] to the format-prefix'd
pr_debug()s to be controlled.
DEFINE_DYNAMIC_DEBUG_CATEGORIES(debug_gvt, __gvt_debug,
"i915/gvt bitmap desc",
/**
* search-prefixes, passed to dd-exec_queries
* defines bits 0-N in order.
* leading ^ is tacitly inserted (by callback currently)
* trailing space used here excludes subcats.
* helper macro needs more work
* macro to autogen ++$i, 0x%x$i ?
*/
_DD_cat_("gvt:cmd: "),
_DD_cat_("gvt:core: "),
_DD_cat_("gvt:dpy: "),
_DD_cat_("gvt:el: "),
_DD_cat_("gvt:irq: "),
_DD_cat_("gvt:mm: "),
_DD_cat_("gvt:mmio: "),
_DD_cat_("gvt:render: "),
_DD_cat_("gvt:sched: "));
dynamic_debug.c: add 3 new elements:
- int param_set_dyndbg()
- int param_get_dyndbg()
- struct kernel_param_ops param_ops_dyndbg
Following the model of kernel/params.c STANDARD_PARAM_DEFS, All 3 are
non-static and exported.
dynamic_debug.h:
Add DEFINE_DYNAMIC_DEBUG_CATEGORIES() described above, and a do-nothing stub.
Note that it also calls MODULE_PARM_DESC for the user, but expects the
user to catenate all the bit-descriptions together (as is done in
drm.debug), and in the following uses in amdgpu, i915.
This in the hope that someone can offer an auto-incrementing
label-generating macro, producing "\tbit-4 0x10\t" etc, and can show
how to apply it to __VA_ARGS__.
Also extern the struct kernel_param param_ops_dyndbg symbol, as is
done in moduleparams.h for all the STANDARD params.
USAGE NOTES:
Using dyndbg to query on "format ^$prefix" requires that the prefix be
present in the compiled-in format string; where run-time prefixing is
used, that format would be "%s...", which is not usefully selectable.
Adding structural query terms (func,file,lineno) could help (module is
already done), but DEFINE_DYNAMIC_DEBUG_CATEGORIES can't do that now,
adding it needs a better reason imo.
Dyndbg is completely agnostic wrt the categorization scheme used, to
play well with any prefix convention already in use. Ad-hoc
categories and sub-categories are implicitly allowed, author
discipline and review is expected.
Here are some examples:
"1","2","3" 2 doesn't imply 1.
otherwize, sorta like printk levels
"1:","2:","3:" are better, avoiding [1-9]\d+ ambiguity
"hi:","mid:","low:" are reasonable, and imply independence
"todo:","rfc:","fixme:" might be handy
"A:".."Z:" uhm, yeah
Hierarchical classes/categories are natural:
"drm:<CAT>:" is used in later commit
"drm:<CAT>:<SUB>:" is a natural extension.
"drm:atomic:fail:" has been proposed, sounds directly useful
Some properties of a hierarchical category deserve explication:
Trailing spaces matter !
With 1..3-space ("drm: ", "drm:atomic: ", "drm:atomic:fail: "), the
":" doesn't terminate the search-space, the trailing space does. So a
"drm:" search spec will match all DRM categories & subcategories, and
will not be useful in an interface where all categories are already
controlled together. That said, "drm:atomic:" & "drm:atomic: " are
different, and both are useful in cases.
Ad-Hoc sub-categories:
These have a caveat wrt wrapper macros adding prefixes like
"drm:atomic: "; the trailing space in the prefix means that
drm_dbg_atomic("fail: ...") pastes as "drm:atomic: fail: ", which
obviously isn't ideal wrt clear and simple bitmaps.
A possible solution is to have a FOO_() version of every FOO() macro
which (anti-mnemonically) elides the trailing space, which is normally
inserted by a modified FOO(). Doing this would enforce a policy
decision that "debug categories will be space terminated", with an
pressure-relief valve.
Summarizing:
- "drm:kms: " & "drm:kms:" are different
- "drm:kms" also different - includes drm:kms2:
- "drm:kms:\t" also different
- "drm:kms:*" doesn't work, no wildcard on format atm.
Order matters in DEFINE_DYNAMIC_DEBUG_CATEGORIES(... @bit_descs)
@bit_descs (array) position determines the bit mapping to the prefix,
so to keep a stable map, new categories or 3rd level categories must
be added to the end.
Since bits are/will-stay applied 0-N, the later bits can countermand
the earlier ones, but its tricky - consider;
DD_CATs(... "drm:atomic:", "drm:atomic:fail:" ) // misleading
The 1st search-term is misleading, because it includes (modifies)
subcategories, but then 2nd overrides it. So don't do that.
For "drm:atomic:fail:" in particular, its best not to add it into an
existing bitmap, because the current setting would be lost at every
(unrelated) write, and a separate bitmap is much more stable.
There is still plenty of bikeshedding to do.
Signed-off-by: Jim Cromie <jim.cromie at gmail.com>
---
v5:
. rename to DEFINE_DYNAMIC_DEBUG_CATEGORIES from DEFINE_DYNDBG_BITMAP
. in set_dyndbg, replace hardcoded "i915" w kp->mod->name
. static inline the stubs
. const *str in structs, const array. - Emil
. dyndbg: add do-nothing DEFINE_DYNAMIC_DEBUG_CATEGORIES if !DD_CORE
. call MOD_PARM_DESC(name, "$desc") for users
. simplify callback, remove bit-change detection
. config errs reported by <lkp at intel.com>
v6:
. return rc, bitmap->, snprintf, ws - Andy Shevchenko
. s/chgct/matches/ - old varname is misleading
. move code off file bottom to a "better" place
. change ##fsname to ##var for safer varname construct
. workaround for !CONFIG_MODULES
. move forward decl down to where its needed
---
include/linux/dynamic_debug.h | 52 +++++++++++++++++++++++-
lib/dynamic_debug.c | 76 ++++++++++++++++++++++++++++++++---
2 files changed, 121 insertions(+), 7 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index dce631e678dd..51b7254daee0 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -51,8 +51,6 @@ struct _ddebug {
#endif
} __attribute__((aligned(8)));
-
-
#if defined(CONFIG_DYNAMIC_DEBUG_CORE)
/* exported for module authors to exercise >control */
@@ -181,6 +179,10 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
KERN_DEBUG, prefix_str, prefix_type, \
rowsize, groupsize, buf, len, ascii)
+struct kernel_param;
+int param_set_dyndbg(const char *instr, const struct kernel_param *kp);
+int param_get_dyndbg(char *buffer, const struct kernel_param *kp);
+
#else /* !CONFIG_DYNAMIC_DEBUG_CORE */
#include <linux/string.h>
@@ -227,6 +229,52 @@ static inline int dynamic_debug_exec_queries(const char *query, const char *modn
return 0;
}
+static inline int param_set_dyndbg(const char *instr, const struct kernel_param *kp)
+ { return 0; }
+static inline int param_get_dyndbg(char *buffer, const struct kernel_param *kp)
+ { return 0; }
+
#endif /* !CONFIG_DYNAMIC_DEBUG_CORE */
+struct dyndbg_bitdesc {
+ /* bitpos is inferred from index in containing array */
+ const char *prefix;
+ const char *help;
+};
+
+#if defined(CONFIG_DYNAMIC_DEBUG) || \
+ (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
+/**
+ * DEFINE_DYNAMIC_DEBUG_CATEGORIES() - define debug categories, bitmap, sysfs-knob
+ * @fsname: parameter basename under /sys
+ * @var: C-identifier holding state
+ * @_desc: string summarizing the controls provided
+ * @...: list of struct dyndbg_bitdesc initializations
+ *
+ * Defines /sys/modules/$modname/parameters/@fsname, and @bit_descs,
+ * which maps bits 0-N to categories of pr_debugs to be controlled.
+ * This is effectively write only, because controlled callsites can be
+ * further modified via >control.
+ *
+ * Also calls MODULE_PARM_DESC(fsname, _desc), with the intent to
+ * generate the bit_legend and apply it to the given bit_descs
+ */
+#define DEFINE_DYNAMIC_DEBUG_CATEGORIES(fsname, var, _desc, ...) \
+ MODULE_PARM_DESC(fsname, _desc); \
+ static const struct dyndbg_bitdesc dyndbg_cats_##var[] = \
+ { __VA_ARGS__, { NULL, NULL } }; \
+ module_param_cb_data(fsname, ¶m_ops_dyndbg, &var, 0644, \
+ &dyndbg_cats_##var)
+
+#define _DD_cat_(pfx) { .prefix = pfx, .help = "help for " pfx }
+#define _DD_cat_help_(pfx) "\t " pfx "\t- help for " pfx "\n"
+
+extern const struct kernel_param_ops param_ops_dyndbg;
+#else
+#define DEFINE_DYNAMIC_DEBUG_CATEGORIES(fsname, var, bitmap_desc, ...) \
+ MODULE_PARM_DESC(fsname, "auto: " bitmap_desc)
+#define _DD_cat_(pfx)
+#define _DD_cat_help_(pfx)
+#endif
+
#endif
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index cb5abb42c16a..a43427c67c3f 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -511,10 +511,11 @@ static int ddebug_exec_query(char *query_string, const char *modname)
return nfound;
}
-/* 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.
-*/
+/*
+ * 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.
+ */
static int ddebug_exec_queries(char *query, const char *modname)
{
char *split;
@@ -529,7 +530,7 @@ static int ddebug_exec_queries(char *query, const char *modname)
if (!query || !*query || *query == '#')
continue;
- vpr_info("query %d: \"%s\"\n", i, query);
+ vpr_info("query %d: \"%s\" %s\n", i, query, (modname) ? modname : "");
rc = ddebug_exec_query(query, modname);
if (rc < 0) {
@@ -577,6 +578,71 @@ int dynamic_debug_exec_queries(const char *query, const char *modname)
}
EXPORT_SYMBOL_GPL(dynamic_debug_exec_queries);
+#ifdef MODULES
+#define KP_MOD_NAME kp->mod->name
+#else
+#define KP_MOD_NAME NULL /* wildcard */
+#endif
+#define FMT_QUERY_SIZE 128 /* typically need <40 */
+/**
+ * param_set_dyndbg() - drm.debug style bits=>categories setter
+ * @instr: string echo>d to sysfs
+ * @kp: struct kernel_param* ->data has bitmap
+ * Exported to support DEFINE_DYNAMIC_DEBUG_CATEGORIES
+ */
+int param_set_dyndbg(const char *instr, const struct kernel_param *kp)
+{
+ unsigned long inbits;
+ int rc, i, matches = 0, totct = 0;
+ char query[FMT_QUERY_SIZE];
+ const struct dyndbg_bitdesc *bitmap = kp->data;
+
+ if (!bitmap) {
+ pr_err("set_dyndbg: no bits=>queries map\n");
+ return -EINVAL;
+ }
+ rc = kstrtoul(instr, 0, &inbits);
+ if (rc) {
+ pr_err("set_dyndbg: failed\n");
+ return rc;
+ }
+ vpr_info("set_dyndbg: input 0x%lx\n", inbits);
+
+ for (i = 0; bitmap->prefix; i++, bitmap++) {
+ snprintf(query, FMT_QUERY_SIZE, "format '^%s' %cp", bitmap->prefix,
+ test_bit(i, &inbits) ? '+' : '-');
+
+ matches = ddebug_exec_queries(query, KP_MOD_NAME);
+
+ v2pr_info("bit-%d: %d matches on '%s'\n", i, matches, query);
+ totct += matches;
+ }
+ vpr_info("total matches: %d\n", totct);
+ return 0;
+}
+EXPORT_SYMBOL(param_set_dyndbg);
+
+/**
+ * param_get_dyndbg() - drm.debug style bitmap to format-prefix categories
+ * @buffer: string returned to user via sysfs
+ * @kp: struct kernel_param*
+ * Exported to provide required .get interface, not useful.
+ * pr_debugs may be altered after .set via `echo $foo >control`
+ */
+int param_get_dyndbg(char *buffer, const struct kernel_param *kp)
+{
+ return scnprintf(buffer, PAGE_SIZE, "%u\n",
+ *((unsigned int *)kp->arg));
+}
+EXPORT_SYMBOL(param_get_dyndbg);
+
+const struct kernel_param_ops param_ops_dyndbg = {
+ .set = param_set_dyndbg,
+ .get = param_get_dyndbg,
+};
+/* support DEFINE_DYNAMIC_DEBUG_CATEGORIES users */
+EXPORT_SYMBOL(param_ops_dyndbg);
+
#define PREFIX_SIZE 64
static int remaining(int wrote)
--
2.31.1
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