qemu-e2k/include/qemu/module.h

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/*
* QEMU Module Infrastructure
*
* Copyright IBM, Corp. 2009
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#ifndef QEMU_MODULE_H
#define QEMU_MODULE_H
#define DSO_STAMP_FUN glue(qemu_stamp, CONFIG_STAMP)
#define DSO_STAMP_FUN_STR stringify(DSO_STAMP_FUN)
#ifdef BUILD_DSO
void DSO_STAMP_FUN(void);
/* This is a dummy symbol to identify a loaded DSO as a QEMU module, so we can
* distinguish "version mismatch" from "not a QEMU module", when the stamp
* check fails during module loading */
void qemu_module_dummy(void);
#define module_init(function, type) \
static void __attribute__((constructor)) do_qemu_init_ ## function(void) \
{ \
register_dso_module_init(function, type); \
}
#else
/* This should not be used directly. Use block_init etc. instead. */
#define module_init(function, type) \
static void __attribute__((constructor)) do_qemu_init_ ## function(void) \
{ \
register_module_init(function, type); \
}
#endif
typedef enum {
MODULE_INIT_MIGRATION,
MODULE_INIT_BLOCK,
MODULE_INIT_OPTS,
MODULE_INIT_QOM,
MODULE_INIT_TRACE,
MODULE_INIT_XEN_BACKEND,
MODULE_INIT_LIBQOS,
MODULE_INIT_FUZZ_TARGET,
MODULE_INIT_MAX
} module_init_type;
#define block_init(function) module_init(function, MODULE_INIT_BLOCK)
#define opts_init(function) module_init(function, MODULE_INIT_OPTS)
#define type_init(function) module_init(function, MODULE_INIT_QOM)
#define trace_init(function) module_init(function, MODULE_INIT_TRACE)
#define xen_backend_init(function) module_init(function, \
MODULE_INIT_XEN_BACKEND)
#define libqos_init(function) module_init(function, MODULE_INIT_LIBQOS)
#define fuzz_target_init(function) module_init(function, \
MODULE_INIT_FUZZ_TARGET)
#define migration_init(function) module_init(function, MODULE_INIT_MIGRATION)
module: add Error arguments to module_load and module_load_qom improve error handling during module load, by changing: bool module_load(const char *prefix, const char *lib_name); void module_load_qom(const char *type); to: int module_load(const char *prefix, const char *name, Error **errp); int module_load_qom(const char *type, Error **errp); where the return value is: -1 on module load error, and errp is set with the error 0 on module or one of its dependencies are not installed 1 on module load success 2 on module load success (module already loaded or built-in) module_load_qom_one has been introduced in: commit 28457744c345 ("module: qom module support"), which built on top of module_load_one, but discarded the bool return value. Restore it. Adapt all callers to emit errors, or ignore them, or fail hard, as appropriate in each context. Replace the previous emission of errors via fprintf in _some_ error conditions with Error and error_report, so as to emit to the appropriate target. A memory leak is also fixed as part of the module_load changes. audio: when attempting to load an audio module, report module load errors. Note that still for some callers, a single issue may generate multiple error reports, and this could be improved further. Regarding the audio code itself, audio_add() seems to ignore errors, and this should probably be improved. block: when attempting to load a block module, report module load errors. For the code paths that already use the Error API, take advantage of those to report module load errors into the Error parameter. For the other code paths, we currently emit the error, but this could be improved further by adding Error parameters to all possible code paths. console: when attempting to load a display module, report module load errors. qdev: when creating a new qdev Device object (DeviceState), report load errors. If a module cannot be loaded to create that device, now abort execution (if no CONFIG_MODULE) or exit (if CONFIG_MODULE). qom/object.c: when initializing a QOM object, or looking up class_by_name, report module load errors. qtest: when processing the "module_load" qtest command, report errors in the load of the module. Signed-off-by: Claudio Fontana <cfontana@suse.de> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220929093035.4231-4-cfontana@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-09-29 11:30:33 +02:00
#define block_module_load(lib, errp) module_load("block-", lib, errp)
#define ui_module_load(lib, errp) module_load("ui-", lib, errp)
#define audio_module_load(lib, errp) module_load("audio-", lib, errp)
2016-08-12 15:27:03 +02:00
void register_module_init(void (*fn)(void), module_init_type type);
void register_dso_module_init(void (*fn)(void), module_init_type type);
void module_call_init(module_init_type type);
module: add Error arguments to module_load and module_load_qom improve error handling during module load, by changing: bool module_load(const char *prefix, const char *lib_name); void module_load_qom(const char *type); to: int module_load(const char *prefix, const char *name, Error **errp); int module_load_qom(const char *type, Error **errp); where the return value is: -1 on module load error, and errp is set with the error 0 on module or one of its dependencies are not installed 1 on module load success 2 on module load success (module already loaded or built-in) module_load_qom_one has been introduced in: commit 28457744c345 ("module: qom module support"), which built on top of module_load_one, but discarded the bool return value. Restore it. Adapt all callers to emit errors, or ignore them, or fail hard, as appropriate in each context. Replace the previous emission of errors via fprintf in _some_ error conditions with Error and error_report, so as to emit to the appropriate target. A memory leak is also fixed as part of the module_load changes. audio: when attempting to load an audio module, report module load errors. Note that still for some callers, a single issue may generate multiple error reports, and this could be improved further. Regarding the audio code itself, audio_add() seems to ignore errors, and this should probably be improved. block: when attempting to load a block module, report module load errors. For the code paths that already use the Error API, take advantage of those to report module load errors into the Error parameter. For the other code paths, we currently emit the error, but this could be improved further by adding Error parameters to all possible code paths. console: when attempting to load a display module, report module load errors. qdev: when creating a new qdev Device object (DeviceState), report load errors. If a module cannot be loaded to create that device, now abort execution (if no CONFIG_MODULE) or exit (if CONFIG_MODULE). qom/object.c: when initializing a QOM object, or looking up class_by_name, report module load errors. qtest: when processing the "module_load" qtest command, report errors in the load of the module. Signed-off-by: Claudio Fontana <cfontana@suse.de> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220929093035.4231-4-cfontana@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-09-29 11:30:33 +02:00
/*
* module_load: attempt to load a module from a set of directories
*
* directories searched are:
* - getenv("QEMU_MODULE_DIR")
* - get_relocated_path(CONFIG_QEMU_MODDIR);
* - /var/run/qemu/${version_dir}
*
* prefix: a subsystem prefix, or the empty string ("audio-", ..., "")
* name: name of the module
* errp: error to set in case the module is found, but load failed.
*
* Return value: -1 on error (errp set if not NULL).
* 0 if module or one of its dependencies are not installed,
* 1 if the module is found and loaded,
* 2 if the module is already loaded, or module is built-in.
*/
int module_load(const char *prefix, const char *name, Error **errp);
/*
* module_load_qom: attempt to load a module to provide a QOM type
*
* type: the type to be provided
* errp: error to set.
*
* Return value: as per module_load.
*/
int module_load_qom(const char *type, Error **errp);
void module_load_qom_all(void);
void module_allow_arch(const char *arch);
/**
* DOC: module info annotation macros
*
* ``scripts/modinfo-collect.py`` will collect module info,
* using the preprocessor and -DQEMU_MODINFO.
*
* ``scripts/modinfo-generate.py`` will create a module meta-data database
* from the collected information so qemu knows about module
* dependencies and QOM objects implemented by modules.
*
* See ``*.modinfo`` and ``modinfo.c`` in the build directory to check the
* script results.
*/
#ifdef QEMU_MODINFO
# define modinfo(kind, value) \
MODINFO_START kind value MODINFO_END
#else
# define modinfo(kind, value)
#endif
/**
* module_obj
*
* @name: QOM type.
*
* This module implements QOM type @name.
*/
#define module_obj(name) modinfo(obj, name)
/**
* module_dep
*
* @name: module name
*
* This module depends on module @name.
*/
#define module_dep(name) modinfo(dep, name)
/**
* module_arch
*
* @name: target architecture
*
* This module is for target architecture @arch.
*
* Note that target-dependent modules are tagged automatically, so
* this is only needed in case target-independent modules should be
* restricted. Use case example: the ccw bus is implemented by s390x
* only.
*/
#define module_arch(name) modinfo(arch, name)
/**
* module_opts
*
* @name: QemuOpts name
*
* This module registers QemuOpts @name.
*/
#define module_opts(name) modinfo(opts, name)
/**
* module_kconfig
*
* @name: Kconfig requirement necessary to load the module
*
* This module requires a core module that should be implemented and
* enabled in Kconfig.
*/
#define module_kconfig(name) modinfo(kconfig, name)
/*
* module info database
*
* scripts/modinfo-generate.c will build this using the data collected
* by scripts/modinfo-collect.py
*/
typedef struct QemuModinfo QemuModinfo;
struct QemuModinfo {
const char *name;
const char *arch;
const char **objs;
const char **deps;
const char **opts;
};
extern const QemuModinfo qemu_modinfo[];
void module_init_info(const QemuModinfo *info);
#endif