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[73.78.62.130]) by smtp.googlemail.com with ESMTPSA id t1-20020a92c901000000b00357cc8df1d5sm141701ilp.68.2023.10.31.17.26.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Oct 2023 17:26:39 -0700 (PDT) From: Jim Cromie To: linux-kernel@vger.kernel.org, jbaron@akamai.com, gregkh@linuxfoundation.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: lb@semihalf.com, linux@rasmusvillemoes.dk, joe@perches.com, mcgrof@kernel.org, daniel.vetter@ffwll.ch, jani.nikula@intel.com, ville.syrjala@linux.intel.com, seanpaul@chromium.org, robdclark@gmail.com, groeck@google.com, yanivt@google.com, bleung@google.com, linux-doc@vger.kernel.org, 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, jim.cromie@gmail.com Subject: [PATCH v7d 16/23] dyndbg-API: promote DYNDBG_CLASSMAP_PARAM to API Date: Tue, 31 Oct 2023 18:26:02 -0600 Message-ID: <20231101002609.3533731-17-jim.cromie@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231101002609.3533731-1-jim.cromie@gmail.com> References: <20231101002609.3533731-1-jim.cromie@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org 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 --- --- drivers/gpu/drm/drm_print.c | 8 ++---- include/drm/drm_print.h | 6 ++-- include/linux/dynamic_debug.h | 37 +++++++++++++++++++++++- lib/test_dynamic_debug.c | 50 +++++++++++++-------------------- lib/test_dynamic_debug_submod.c | 9 +++++- 5 files changed, 69 insertions(+), 41 deletions(-) diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c index dabcfa0dd279..8f4b609353a5 100644 --- a/drivers/gpu/drm/drm_print.c +++ b/drivers/gpu/drm/drm_print.c @@ -69,12 +69,8 @@ DRM_CLASSMAP_DEFINE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, "DRM_UT_DP", "DRM_UT_DRMRES"); -static struct ddebug_class_param drm_debug_bitmap = { - .bits = &__drm_debug, - .flags = "p", - .map = &drm_debug_classes, -}; -module_param_cb(debug, ¶m_ops_dyndbg_classes, &drm_debug_bitmap, 0600); +DRM_CLASSMAP_PARAM_REF(debug, __drm_debug, drm_debug_classes, p); + #endif void __drm_puts_coredump(struct drm_printer *p, const char *str) diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h index 706afc97c79c..94d4f5500030 100644 --- a/include/drm/drm_print.h +++ b/include/drm/drm_print.h @@ -322,11 +322,13 @@ enum drm_debug_category { }; #ifdef CONFIG_DRM_USE_DYNAMIC_DEBUG -#define DRM_CLASSMAP_DEFINE(...) DYNDBG_CLASSMAP_DEFINE(__VA_ARGS__) -#define DRM_CLASSMAP_USE(name) DYNDBG_CLASSMAP_USE(name) +#define DRM_CLASSMAP_DEFINE(...) DYNDBG_CLASSMAP_DEFINE(__VA_ARGS__) +#define DRM_CLASSMAP_USE(name) DYNDBG_CLASSMAP_USE(name) +#define DRM_CLASSMAP_PARAM_REF(...) DYNDBG_CLASSMAP_PARAM_REF(__VA_ARGS__) #else #define DRM_CLASSMAP_DEFINE(...) #define DRM_CLASSMAP_USE(name) +#define DRM_CLASSMAP_PARAM_REF(...) #endif static inline bool drm_debug_enabled_raw(enum drm_debug_category category) diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h index 373d152f4285..2a7832b1ba5b 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, \ @@ -145,6 +145,41 @@ 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/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 @@ -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 "); 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 @@ -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 "); +MODULE_LICENSE("GPL");