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Fri, 5 Sep 2025 21:16:02 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id D6ED76060B; Fri, 5 Sep 2025 21:16:17 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id B4E33102F1C32; Fri, 5 Sep 2025 23:16:11 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1757106976; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:content-language:in-reply-to:references:autocrypt; bh=sjXsVs41POn3zl7mwth27KGLe7I+5IAV0bpWcFgzeL4=; b=QXK26/QP3qKkfw4bP0mFfzVTFiOFmWATrTck6pTLkX4Wh7cihUVKpdpIANAOZ55uY04NA9 yuhyAzakVqT2Sf1XNc9FoTuSIMpmGd/R03MucpPf/bhYaUdWemy118zoDLFkxJO+eJMG7u vQ+6MX4z7MDQiBHgPVslO7g1+3QMyoAYqHht03zZmB+LufOO5HYHOovkd873HEgcY2pYjs B7EIA0m9ecu7EF4ZPH5neIqCrjW6rQn8+A+M/MD1R86UfU0MdtTubGhjomymjvQSDnTp1Y 5bcytPUG6Y+cAzMlMDUPlXlfDuxe5BxgusSI0YZ0wPiAt47MdR8Lm0eCMpckkA== Message-ID: Date: Fri, 5 Sep 2025 23:16:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 16/58] dyndbg-API: remove DD_CLASS_TYPE_(DISJOINT|LEVEL)_NAMES and code To: Jim Cromie , linux-kernel@vger.kernel.org, jbaron@akamai.com, gregkh@linuxfoundation.org, ukaszb@chromium.org Cc: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, daniel.vetter@ffwll.ch, tvrtko.ursulin@linux.intel.com, jani.nikula@intel.com, ville.syrjala@linux.intel.com, seanpaul@chromium.org, robdclark@gmail.com, groeck@google.com, yanivt@google.com, bleung@google.com, quic_saipraka@quicinc.com, will@kernel.org, catalin.marinas@arm.com, quic_psodagud@quicinc.com, maz@kernel.org, arnd@arndb.de, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, mingo@redhat.com References: <20250803035816.603405-1-jim.cromie@gmail.com> <20250803035816.603405-17-jim.cromie@gmail.com> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Le 03/08/2025 à 05:57, Jim Cromie a écrit : > Remove the DD_CLASS_TYPE_*_NAMES classmap types and code. > > 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 LOC & test-surface; simplify things. > > Also rename enum class_map_type to enum ddebug_class_map_type. > > Signed-off-by: Jim Cromie Reviewed-by: Louis Chauvet > --- > 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 f4d1d08cd5a7c..769f02456c8e0 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 09f19155d7f02..2cd28a64578dd 100644 > --- a/lib/dynamic_debug.c > +++ b/lib/dynamic_debug.c > @@ -646,76 +646,6 @@ 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 *mod_name) > @@ -724,29 +654,17 @@ 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 */ > @@ -812,12 +730,8 @@ 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 8434f70b51bb3..9c3e53cd26bd8 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) -- Louis Chauvet, Bootlin Embedded Linux and Kernel engineering https://bootlin.com