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linux/tools/perf/util/machine.h
Adrian Hunter 096fc36180 perf tools: Add guest_code support 
A common case for KVM test programs is that the test program acts as the
hypervisor, creating, running and destroying the virtual machine, and
providing the guest object code from its own object code. In this case,
the VM is not running an OS, but only the functions loaded into it by the
hypervisor test program, and conveniently, loaded at the same virtual
addresses.

Normally to resolve addresses, MMAP events are needed to map addresses
back to the object code and debug symbols for that object code.

Currently, there is no way to get such mapping information from guests
but, in the scenario described above, the guest has the same mappings
as the hypervisor, so support for that scenario can be achieved.

To support that, copy the host thread's maps to the guest thread's maps.
Note, we do not discover the guest until we encounter a guest event,
which works well because it is not until then that we know that the host
thread's maps have been set up.

Typically the main function for the guest object code is called
"guest_code", hence the name chosen for this feature. Note, that is just a
convention, the function could be named anything, and the tools do not
care.

This is primarily aimed at supporting Intel PT, or similar, where trace
data can be recorded for a guest. Refer to the final patch in this series
"perf intel-pt: Add guest_code support" for an example.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220517131011.6117-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2022-05-23 10:18:38 -03:00

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PERF_MACHINE_H
#define __PERF_MACHINE_H
#include <sys/types.h>
#include <linux/rbtree.h>
#include "maps.h"
#include "dsos.h"
#include "rwsem.h"
struct addr_location;
struct branch_stack;
struct dso;
struct dso_id;
struct evsel;
struct perf_sample;
struct symbol;
struct target;
struct thread;
union perf_event;
struct machines;
/* Native host kernel uses -1 as pid index in machine */
#define HOST_KERNEL_ID (-1)
#define DEFAULT_GUEST_KERNEL_ID (0)
extern const char *ref_reloc_sym_names[];
struct vdso_info;
#define THREADS__TABLE_BITS 8
#define THREADS__TABLE_SIZE (1 << THREADS__TABLE_BITS)
struct threads {
struct rb_root_cached entries;
struct rw_semaphore lock;
unsigned int nr;
struct list_head dead;
struct thread *last_match;
};
struct machine {
struct rb_node rb_node;
pid_t pid;
u16 id_hdr_size;
bool comm_exec;
bool kptr_restrict_warned;
bool single_address_space;
char *root_dir;
char *mmap_name;
struct threads threads[THREADS__TABLE_SIZE];
struct vdso_info *vdso_info;
struct perf_env *env;
struct dsos dsos;
struct maps *kmaps;
struct map *vmlinux_map;
u64 kernel_start;
pid_t *current_tid;
union { /* Tool specific area */
void *priv;
u64 db_id;
};
struct machines *machines;
bool trampolines_mapped;
};
static inline struct threads *machine__threads(struct machine *machine, pid_t tid)
{
/* Cast it to handle tid == -1 */
return &machine->threads[(unsigned int)tid % THREADS__TABLE_SIZE];
}
/*
* The main kernel (vmlinux) map
*/
static inline
struct map *machine__kernel_map(struct machine *machine)
{
return machine->vmlinux_map;
}
/*
* kernel (the one returned by machine__kernel_map()) plus kernel modules maps
*/
static inline
struct maps *machine__kernel_maps(struct machine *machine)
{
return machine->kmaps;
}
int machine__get_kernel_start(struct machine *machine);
static inline u64 machine__kernel_start(struct machine *machine)
{
if (!machine->kernel_start)
machine__get_kernel_start(machine);
return machine->kernel_start;
}
static inline bool machine__kernel_ip(struct machine *machine, u64 ip)
{
u64 kernel_start = machine__kernel_start(machine);
return ip >= kernel_start;
}
u8 machine__addr_cpumode(struct machine *machine, u8 cpumode, u64 addr);
struct thread *machine__find_thread(struct machine *machine, pid_t pid,
pid_t tid);
struct thread *machine__idle_thread(struct machine *machine);
struct comm *machine__thread_exec_comm(struct machine *machine,
struct thread *thread);
int machine__process_comm_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_exit_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_fork_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_lost_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_lost_samples_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_aux_event(struct machine *machine,
union perf_event *event);
int machine__process_itrace_start_event(struct machine *machine,
union perf_event *event);
int machine__process_aux_output_hw_id_event(struct machine *machine,
union perf_event *event);
int machine__process_switch_event(struct machine *machine,
union perf_event *event);
int machine__process_namespaces_event(struct machine *machine,
union perf_event *event,
struct perf_sample *sample);
int machine__process_cgroup_event(struct machine *machine,
union perf_event *event,
struct perf_sample *sample);
int machine__process_mmap_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_mmap2_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
int machine__process_ksymbol(struct machine *machine,
union perf_event *event,
struct perf_sample *sample);
int machine__process_text_poke(struct machine *machine,
union perf_event *event,
struct perf_sample *sample);
int machine__process_event(struct machine *machine, union perf_event *event,
struct perf_sample *sample);
typedef void (*machine__process_t)(struct machine *machine, void *data);
struct machines {
struct machine host;
struct rb_root_cached guests;
};
void machines__init(struct machines *machines);
void machines__exit(struct machines *machines);
void machines__process_guests(struct machines *machines,
machine__process_t process, void *data);
struct machine *machines__add(struct machines *machines, pid_t pid,
const char *root_dir);
struct machine *machines__find(struct machines *machines, pid_t pid);
struct machine *machines__findnew(struct machines *machines, pid_t pid);
struct machine *machines__find_guest(struct machines *machines, pid_t pid);
struct thread *machines__findnew_guest_code(struct machines *machines, pid_t pid);
struct thread *machine__findnew_guest_code(struct machine *machine, pid_t pid);
void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size);
void machines__set_comm_exec(struct machines *machines, bool comm_exec);
struct machine *machine__new_host(void);
struct machine *machine__new_kallsyms(void);
int machine__init(struct machine *machine, const char *root_dir, pid_t pid);
void machine__exit(struct machine *machine);
void machine__delete_threads(struct machine *machine);
void machine__delete(struct machine *machine);
void machine__remove_thread(struct machine *machine, struct thread *th);
struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
struct addr_location *al);
struct mem_info *sample__resolve_mem(struct perf_sample *sample,
struct addr_location *al);
struct callchain_cursor;
int thread__resolve_callchain(struct thread *thread,
struct callchain_cursor *cursor,
struct evsel *evsel,
struct perf_sample *sample,
struct symbol **parent,
struct addr_location *root_al,
int max_stack);
/*
* Default guest kernel is defined by parameter --guestkallsyms
* and --guestmodules
*/
static inline bool machine__is_default_guest(struct machine *machine)
{
return machine ? machine->pid == DEFAULT_GUEST_KERNEL_ID : false;
}
static inline bool machine__is_host(struct machine *machine)
{
return machine ? machine->pid == HOST_KERNEL_ID : false;
}
bool machine__is(struct machine *machine, const char *arch);
bool machine__normalized_is(struct machine *machine, const char *arch);
int machine__nr_cpus_avail(struct machine *machine);
struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid);
struct thread *machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid);
struct dso *machine__findnew_dso_id(struct machine *machine, const char *filename, struct dso_id *id);
struct dso *machine__findnew_dso(struct machine *machine, const char *filename);
size_t machine__fprintf(struct machine *machine, FILE *fp);
static inline
struct symbol *machine__find_kernel_symbol(struct machine *machine, u64 addr,
struct map **mapp)
{
return maps__find_symbol(machine->kmaps, addr, mapp);
}
static inline
struct symbol *machine__find_kernel_symbol_by_name(struct machine *machine,
const char *name,
struct map **mapp)
{
return maps__find_symbol_by_name(machine->kmaps, name, mapp);
}
int arch__fix_module_text_start(u64 *start, u64 *size, const char *name);
int machine__load_kallsyms(struct machine *machine, const char *filename);
int machine__load_vmlinux_path(struct machine *machine);
size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
bool (skip)(struct dso *dso, int parm), int parm);
size_t machines__fprintf_dsos(struct machines *machines, FILE *fp);
size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
bool (skip)(struct dso *dso, int parm), int parm);
void machine__destroy_kernel_maps(struct machine *machine);
int machine__create_kernel_maps(struct machine *machine);
int machines__create_kernel_maps(struct machines *machines, pid_t pid);
int machines__create_guest_kernel_maps(struct machines *machines);
void machines__destroy_kernel_maps(struct machines *machines);
size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp);
typedef int (*machine__dso_t)(struct dso *dso, struct machine *machine, void *priv);
int machine__for_each_dso(struct machine *machine, machine__dso_t fn,
void *priv);
int machine__for_each_thread(struct machine *machine,
int (*fn)(struct thread *thread, void *p),
void *priv);
int machines__for_each_thread(struct machines *machines,
int (*fn)(struct thread *thread, void *p),
void *priv);
pid_t machine__get_current_tid(struct machine *machine, int cpu);
int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
pid_t tid);
/*
* For use with libtraceevent's tep_set_function_resolver()
*/
char *machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp);
void machine__get_kallsyms_filename(struct machine *machine, char *buf,
size_t bufsz);
int machine__create_extra_kernel_maps(struct machine *machine,
struct dso *kernel);
/* Kernel-space maps for symbols that are outside the main kernel map and module maps */
struct extra_kernel_map {
u64 start;
u64 end;
u64 pgoff;
char name[KMAP_NAME_LEN];
};
int machine__create_extra_kernel_map(struct machine *machine,
struct dso *kernel,
struct extra_kernel_map *xm);
int machine__map_x86_64_entry_trampolines(struct machine *machine,
struct dso *kernel);
#endif /* __PERF_MACHINE_H */
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