patch 1 in this series fixed a CLASSMAP usage error, this improves the api so that misuse is less likely. changes here: 0- Add William Swanson's public domain map macro: https://github.com/swansontec/map-macro/blob/master/map.h this makes 1 possible. 1- classnames were formerly specified as strings: "DRM_UT_CORE" now they are the actual enum const symbols: DRM_UT_CORE direct use of symbols is tighter, more comprehensible by tools, grep 2- drop _base arg. _base was the value of the 1st classname that is now available due to 1, no need to require it 2x So take _base out of the API/kdoc. Note that the macro impl keeps the _base arg so that it can be used to set classmap.base, but reuses it in the MAP-stringify _base, __VA_ARGS__ expression. Also cleanup the API usage comment in test_dynamic_debug.c, and since comments in test-code might not be noticed, restate that here. Using the CLASSMAP api: - class-specifications are enum consts/symbols, like DRM_UT_CORE, DRM_UT_KMS, etc. their values define bits in the sysfs-node (like drm.debug) - they are stringified and accepted at >control echo class DRM_UT_CORE +p >control - multiple class-maps must share the per-module: 0-62 class_id space (by setting initial enum values to non-overlapping subranges) todo: fixup the 'i' prefix, a quick/dirty avoidance of MAP. NOTE: test_dynamic_debug.c also has this helper macro to wire a classmap to a drm.debug style parameter; its easier to just use it as a model/template as needed, rather than try to make it general enough to be an official API helper. define DD_SYS_WRAP(_model, _flags) \ static unsigned long bits_##_model; \ 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) Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx> --- drivers/gpu/drm/drm_print.c | 22 +++++++------- include/drm/drm_print.h | 1 + include/linux/dynamic_debug.h | 17 ++++++----- include/linux/map.h | 54 +++++++++++++++++++++++++++++++++++ lib/test_dynamic_debug.c | 43 ++++++++++++++-------------- 5 files changed, 95 insertions(+), 42 deletions(-) create mode 100644 include/linux/map.h diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c index 4b697e18238d..07c25241e8cc 100644 --- a/drivers/gpu/drm/drm_print.c +++ b/drivers/gpu/drm/drm_print.c @@ -56,17 +56,17 @@ MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug cat module_param_named(debug, __drm_debug, ulong, 0600); #else /* classnames must match vals of enum drm_debug_category */ -DYNDBG_CLASSMAP_DEFINE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0, - "DRM_UT_CORE", - "DRM_UT_DRIVER", - "DRM_UT_KMS", - "DRM_UT_PRIME", - "DRM_UT_ATOMIC", - "DRM_UT_VBL", - "DRM_UT_STATE", - "DRM_UT_LEASE", - "DRM_UT_DP", - "DRM_UT_DRMRES"); +DYNDBG_CLASSMAP_DEFINE(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, + DRM_UT_CORE, + DRM_UT_DRIVER, + DRM_UT_KMS, + DRM_UT_PRIME, + DRM_UT_ATOMIC, + DRM_UT_VBL, + DRM_UT_STATE, + DRM_UT_LEASE, + DRM_UT_DP, + DRM_UT_DRMRES); static struct ddebug_class_param drm_debug_bitmap = { .bits = &__drm_debug, diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h index a44fb7ef257f..6a27e8f26770 100644 --- a/include/drm/drm_print.h +++ b/include/drm/drm_print.h @@ -333,6 +333,7 @@ static inline bool drm_debug_enabled_raw(enum drm_debug_category category) }) #if defined(CONFIG_DRM_USE_DYNAMIC_DEBUG) +//extern struct ddebug_class_map drm_debug_classes[]; /* * the drm.debug API uses dyndbg, so each drm_*dbg macro/callsite gets * a descriptor, and only enabled callsites are reachable. They use diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h index 91015d1a04e0..7cdfc4b533ae 100644 --- a/include/linux/dynamic_debug.h +++ b/include/linux/dynamic_debug.h @@ -7,6 +7,7 @@ #endif #include <linux/build_bug.h> +#include <linux/map.h> /* * An instance of this structure is created in a special @@ -90,18 +91,16 @@ struct ddebug_class_map { }; /** - * DYNDBG_CLASSMAP_DEFINE - define debug-classes used by a module. - * @_var: name of the classmap, exported for other modules coordinated use. - * @_type: enum class_map_type, chooses bits/verbose, numeric/symbolic - * @_base: offset of 1st class-name. splits .class_id space - * @classes: enum-map - symbol names are "classnames", vals are .class_ids + * DYNDBG_CLASSMAP_DEFINE - define the debug classes used in this module. + * This tells dyndbg what debug classes it should control for the client. * - * @classes vals are _ddebug.class_ids used in the module, the symbol - * names are stringified; they authorize "class FOO" to >control. - * Connection to a kernel-param is done separately. + * @_var: struct ddebug_class_map, as passed to module_param_cb + * @_type: enum ddebug_class_map_type, chooses bits/verbose, numeric/symbolic + * @classes: enum class values used in module, such as: DRM_UT_* */ #define DYNDBG_CLASSMAP_DEFINE(_var, _maptype, _base, ...) \ - const char *_var##_classnames[] = { __VA_ARGS__ }; \ + const char *_var##_classnames[] = { \ + iMAP_LIST(__stringify, _base, __VA_ARGS__) }; \ struct ddebug_class_map __aligned(8) __used \ __section("__dyndbg_classes") _var = { \ .mod = THIS_MODULE, \ diff --git a/include/linux/map.h b/include/linux/map.h new file mode 100644 index 000000000000..4348313a596f --- /dev/null +++ b/include/linux/map.h @@ -0,0 +1,54 @@ +/* + * Created by William Swanson in 2012. + * + * I, William Swanson, dedicate this work to the public domain. + * I waive all rights to the work worldwide under copyright law, + * including all related and neighboring rights, + * to the extent allowed by law. + * + * You can copy, modify, distribute and perform the work, + * even for commercial purposes, all without asking permission. + */ + +#ifndef MAP_H_INCLUDED +#define MAP_H_INCLUDED + +#define iEVAL0(...) __VA_ARGS__ +#define iEVAL1(...) iEVAL0(iEVAL0(iEVAL0(__VA_ARGS__))) +#define iEVAL2(...) iEVAL1(iEVAL1(iEVAL1(__VA_ARGS__))) +#define iEVAL3(...) iEVAL2(iEVAL2(iEVAL2(__VA_ARGS__))) +#define iEVAL4(...) iEVAL3(iEVAL3(iEVAL3(__VA_ARGS__))) +#define iEVAL(...) iEVAL4(iEVAL4(iEVAL4(__VA_ARGS__))) + +#define iMAP_END(...) +#define iMAP_OUT +#define iMAP_COMMA , + +#define iMAP_GET_END2() 0, iMAP_END +#define iMAP_GET_END1(...) iMAP_GET_END2 +#define iMAP_GET_END(...) iMAP_GET_END1 +#define iMAP_NEXT0(test, next, ...) next iMAP_OUT +#define iMAP_NEXT1(test, next) iMAP_NEXT0(test, next, 0) +#define iMAP_NEXT(test, next) iMAP_NEXT1(iMAP_GET_END test, next) + +#define iMAP0(f, x, peek, ...) f(x) iMAP_NEXT(peek, iMAP1)(f, peek, __VA_ARGS__) +#define iMAP1(f, x, peek, ...) f(x) iMAP_NEXT(peek, iMAP0)(f, peek, __VA_ARGS__) + +#define iMAP_LIST_NEXT1(test, next) iMAP_NEXT0(test, iMAP_COMMA next, 0) +#define iMAP_LIST_NEXT(test, next) iMAP_LIST_NEXT1(iMAP_GET_END test, next) + +#define iMAP_LIST0(f, x, peek, ...) f(x) iMAP_LIST_NEXT(peek, iMAP_LIST1)(f, peek, __VA_ARGS__) +#define iMAP_LIST1(f, x, peek, ...) f(x) iMAP_LIST_NEXT(peek, iMAP_LIST0)(f, peek, __VA_ARGS__) + +/** + * Applies the function macro `f` to each of the remaining parameters. + */ +#define iMAP(f, ...) iEVAL(iMAP1(f, __VA_ARGS__, ()()(), ()()(), ()()(), 0)) + +/** + * Applies the function macro `f` to each of the remaining parameters and + * inserts commas between the results. + */ +#define iMAP_LIST(f, ...) iEVAL(iMAP_LIST1(f, __VA_ARGS__, ()()(), ()()(), ()()(), 0)) + +#endif diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c index 8d384b979e74..e678884066bf 100644 --- a/lib/test_dynamic_debug.c +++ b/lib/test_dynamic_debug.c @@ -33,11 +33,10 @@ 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) + * - class-names are enum consts/symbols, like DRM_UT_CORE, DRM_UT_KMS, etc + * - those names are accepted at >control interface + * - multiple class-maps must share the per-module: 0-62 class_id space + * (by setting initial enum values to non-overlapping subranges) * Additionally, here: * - tie together sysname, mapname, bitsname, flagsname */ @@ -62,38 +61,38 @@ enum cat_disjoint_bits { D2_LEASE, D2_DP, D2_DRMRES }; -DYNDBG_CLASSMAP_DEFINE(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"); +DYNDBG_CLASSMAP_DEFINE(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, + 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); /* symbolic input, independent bits */ enum cat_disjoint_names { LOW = 10, MID, HI }; -DYNDBG_CLASSMAP_DEFINE(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10, - "LOW", "MID", "HI"); +DYNDBG_CLASSMAP_DEFINE(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, + 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 }; -DYNDBG_CLASSMAP_DEFINE(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14, - "V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7"); +DYNDBG_CLASSMAP_DEFINE(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, + V0, V1, V2, V3, V4, V5, V6, V7); 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 }; -DYNDBG_CLASSMAP_DEFINE(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22, - "L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7"); +DYNDBG_CLASSMAP_DEFINE(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, + L0, L1, L2, L3, L4, L5, L6, L7); DD_SYS_WRAP(level_names, p); DD_SYS_WRAP(level_names, T); -- 2.39.0
