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/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gem-interrupts.h"
#include "debugfs.h"
#include "perf.h"
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;
sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
if (stat(buf, &st))
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)
{
uint64_t val;
int update;
if (irqs->error)
return irqs->error;
if (irqs->fd < 0) {
char buf[8192], *b;
int fd, len;
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 (len < 0)
return irqs->error = errno;
buf[len] = '\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 = val;
irqs->delta = irqs->count - irqs->last_count;
return update ? EAGAIN : 0;
}
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