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overlay: Read interrupts from perf

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2013-08-27 12:24:18 +01:00
parent 14614060b8
commit d58aed18ee
2 changed files with 56 additions and 23 deletions
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78
overlay/gem-interrupts.c
View File

@ -32,50 +32,82 @@
#include "gem-interrupts.h"
#include "debugfs.h"
#include "perf.h"
int gem_interrupts_init(struct gem_interrupts *irqs)
static int perf_open(void)
{
struct perf_event_attr attr;
memset(&attr, 0, sizeof (attr));
attr.type = i915_type_id();
if (attr.type == 0)
return -ENOENT;
attr.config = I915_PERF_INTERRUPTS;
return perf_event_open(&attr, -1, 0, -1, 0);
}
static int debugfs_open(void)
{
char buf[1024];
struct stat st;
memset(irqs, 0, sizeof(*irqs));
sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
if (stat(buf, &st))
return irqs->error = errno;
return errno;
return 0;
}
int gem_interrupts_init(struct gem_interrupts *irqs)
{
memset(irqs, 0, sizeof(*irqs));
irqs->fd = perf_open();
if (irqs->fd < 0)
irqs->error = debugfs_open();
return irqs->error;
}
int gem_interrupts_update(struct gem_interrupts *irqs)
{
char buf[8192], *b;
int fd, len;
uint64_t val;
int update;
if (irqs->error)
return irqs->error;
sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0)
return irqs->error = errno;
len = read(fd, buf, sizeof(buf)-1);
close(fd);
if (irqs->fd < 0) {
char buf[8192], *b;
int fd, len;
if (len < 0)
return irqs->error = errno;
sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
fd = open(buf, 0);
if (fd < 0)
return irqs->error = errno;
len = read(fd, buf, sizeof(buf)-1);
close(fd);
buf[len] = '\0';
if (len < 0)
return irqs->error = errno;
b = strstr(buf, "Interrupts received:");
if (b == NULL)
return irqs->error = ENOENT;
buf[len] = '\0';
fd = irqs->last_count == 0;
b = strstr(buf, "Interrupts received:");
if (b == NULL)
return irqs->error = ENOENT;
val = strtoull(b + sizeof("Interrupts received:"), 0, 0);
} else {
if (read(irqs->fd, &val, sizeof(val)) < 0)
return irqs->error = errno;
}
update = irqs->last_count == 0;
irqs->last_count = irqs->count;
irqs->count = strtoull(b + sizeof("Interrupts received:"), 0, 0);
irqs->count = val;
irqs->delta = irqs->count - irqs->last_count;
return fd ? EAGAIN : 0;
return update ? EAGAIN : 0;
}

1
overlay/gem-interrupts.h
View File

@ -30,6 +30,7 @@
struct gem_interrupts {
long unsigned last_count, count, delta;
int error;
int fd;
};
int gem_interrupts_init(struct gem_interrupts *irqs);