mirror of
https://github.com/tiagovignatti/intel-gpu-tools.git
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162 lines
3.4 KiB
C
162 lines
3.4 KiB
C
/*
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* Copyright © 2013 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include "gem-interrupts.h"
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#include "debugfs.h"
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#include "perf.h"
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static int perf_open(void)
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{
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struct perf_event_attr attr;
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memset(&attr, 0, sizeof (attr));
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attr.type = i915_type_id();
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if (attr.type == 0)
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return -ENOENT;
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attr.config = I915_PERF_INTERRUPTS;
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return perf_event_open(&attr, -1, 0, -1, 0);
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}
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static long long debugfs_read(void)
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{
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char buf[8192], *b;
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int fd, len;
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sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
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fd = open(buf, 0);
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if (fd < 0)
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return -1;
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len = read(fd, buf, sizeof(buf)-1);
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close(fd);
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if (len < 0)
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return -1;
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buf[len] = '\0';
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b = strstr(buf, "Interrupts received:");
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if (b == NULL)
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return -1;
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return strtoull(b + sizeof("Interrupts received:"), 0, 0);
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}
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static long long procfs_read(void)
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{
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char buf[8192], *b;
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int fd, len;
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unsigned long long val;
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/* 44: 51 42446 0 0 PCI-MSI-edge i915*/
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fd = open("/proc/interrupts", 0);
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if (fd < 0)
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return -1;
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len = read(fd, buf, sizeof(buf)-1);
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close(fd);
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if (len < 0)
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return -1;
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buf[len] = '\0';
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b = strstr(buf, "i915");
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if (b == NULL)
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return -1;
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while (*--b != ':')
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;
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val = 0;
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do {
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while (isspace(*++b))
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;
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if (!isdigit(*b))
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break;
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val += strtoull(b, &b, 0);
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} while(1);
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return val;
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}
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static long long interrupts_read(void)
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{
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long long val;
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val = debugfs_read();
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if (val < 0)
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val = procfs_read();
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return val;
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}
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int gem_interrupts_init(struct gem_interrupts *irqs)
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{
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memset(irqs, 0, sizeof(*irqs));
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irqs->fd = perf_open();
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if (irqs->fd < 0 && interrupts_read() < 0)
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irqs->error = ENODEV;
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return irqs->error;
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}
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int gem_interrupts_update(struct gem_interrupts *irqs)
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{
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uint64_t val;
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int update;
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if (irqs->error)
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return irqs->error;
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if (irqs->fd < 0) {
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long long ret;
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ret = interrupts_read();
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if (ret < 0)
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return irqs->error = ENODEV;
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else
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val = ret;
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} else {
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if (read(irqs->fd, &val, sizeof(val)) < 0)
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return irqs->error = errno;
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}
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update = irqs->last_count == 0;
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irqs->last_count = irqs->count;
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irqs->count = val;
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irqs->delta = irqs->count - irqs->last_count;
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return update ? EAGAIN : 0;
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}
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