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// SPDX-License-Identifier: GPL-2.0
#ifdef HAVE_BPF_SKEL
#include "timerlat.h"
#include "timerlat_bpf.h"
#include "timerlat.skel.h"
static struct timerlat_bpf *bpf;
/*
* timerlat_bpf_init - load and initialize BPF program to collect timerlat data
*/
int timerlat_bpf_init(struct timerlat_params *params)
{
int err;
debug_msg("Loading BPF program\n");
bpf = timerlat_bpf__open();
if (!bpf)
return 1;
/* Pass common options */
bpf->rodata->output_divisor = params->output_divisor;
bpf->rodata->entries = params->entries;
bpf->rodata->irq_threshold = params->stop_us;
bpf->rodata->thread_threshold = params->stop_total_us;
bpf->rodata->aa_only = params->aa_only;
if (params->entries != 0) {
/* Pass histogram options */
bpf->rodata->bucket_size = params->bucket_size;
/* Set histogram array sizes */
bpf_map__set_max_entries(bpf->maps.hist_irq, params->entries);
bpf_map__set_max_entries(bpf->maps.hist_thread, params->entries);
bpf_map__set_max_entries(bpf->maps.hist_user, params->entries);
} else {
/* No entries, disable histogram */
bpf_map__set_autocreate(bpf->maps.hist_irq, false);
bpf_map__set_autocreate(bpf->maps.hist_thread, false);
bpf_map__set_autocreate(bpf->maps.hist_user, false);
}
if (params->aa_only) {
/* Auto-analysis only, disable summary */
bpf_map__set_autocreate(bpf->maps.summary_irq, false);
bpf_map__set_autocreate(bpf->maps.summary_thread, false);
bpf_map__set_autocreate(bpf->maps.summary_user, false);
}
/* Load and verify BPF program */
err = timerlat_bpf__load(bpf);
if (err) {
timerlat_bpf__destroy(bpf);
return err;
}
return 0;
}
/*
* timerlat_bpf_attach - attach BPF program to collect timerlat data
*/
int timerlat_bpf_attach(void)
{
debug_msg("Attaching BPF program\n");
return timerlat_bpf__attach(bpf);
}
/*
* timerlat_bpf_detach - detach BPF program to collect timerlat data
*/
void timerlat_bpf_detach(void)
{
timerlat_bpf__detach(bpf);
}
/*
* timerlat_bpf_detach - destroy BPF program to collect timerlat data
*/
void timerlat_bpf_destroy(void)
{
timerlat_bpf__destroy(bpf);
}
static int handle_rb_event(void *ctx, void *data, size_t data_sz)
{
return 0;
}
/*
* timerlat_bpf_wait - wait until tracing is stopped or signal
*/
int timerlat_bpf_wait(int timeout)
{
struct ring_buffer *rb;
int retval;
rb = ring_buffer__new(bpf_map__fd(bpf->maps.signal_stop_tracing),
handle_rb_event, NULL, NULL);
retval = ring_buffer__poll(rb, timeout * 1000);
ring_buffer__free(rb);
return retval;
}
static int get_value(struct bpf_map *map_irq,
struct bpf_map *map_thread,
struct bpf_map *map_user,
int key,
long long *value_irq,
long long *value_thread,
long long *value_user,
int cpus)
{
int err;
err = bpf_map__lookup_elem(map_irq, &key,
sizeof(unsigned int), value_irq,
sizeof(long long) * cpus, 0);
if (err)
return err;
err = bpf_map__lookup_elem(map_thread, &key,
sizeof(unsigned int), value_thread,
sizeof(long long) * cpus, 0);
if (err)
return err;
err = bpf_map__lookup_elem(map_user, &key,
sizeof(unsigned int), value_user,
sizeof(long long) * cpus, 0);
if (err)
return err;
return 0;
}
/*
* timerlat_bpf_get_hist_value - get value from BPF hist map
*/
int timerlat_bpf_get_hist_value(int key,
long long *value_irq,
long long *value_thread,
long long *value_user,
int cpus)
{
return get_value(bpf->maps.hist_irq,
bpf->maps.hist_thread,
bpf->maps.hist_user,
key, value_irq, value_thread, value_user, cpus);
}
/*
* timerlat_bpf_get_summary_value - get value from BPF summary map
*/
int timerlat_bpf_get_summary_value(enum summary_field key,
long long *value_irq,
long long *value_thread,
long long *value_user,
int cpus)
{
return get_value(bpf->maps.summary_irq,
bpf->maps.summary_thread,
bpf->maps.summary_user,
key, value_irq, value_thread, value_user, cpus);
}
#endif /* HAVE_BPF_SKEL */
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