| /* |
| * 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 <unistd.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <stdio.h> |
| |
| #include "gpu-freq.h" |
| #include "debugfs.h" |
| |
| int gpu_freq_init(struct gpu_freq *gf) |
| { |
| char buf[4096], *s; |
| int fd, len = -1; |
| |
| memset(gf, 0, sizeof(*gf)); |
| |
| sprintf(buf, "%s/i915_cur_delayinfo", debugfs_path); |
| fd = open(buf, 0); |
| if (fd < 0) |
| return gf->error = errno; |
| |
| len = read(fd, buf, sizeof(buf)-1); |
| close(fd); |
| if (len < 0) |
| goto err; |
| |
| buf[len] = '\0'; |
| |
| s = strstr(buf, "(RPN)"); |
| if (s == NULL) |
| goto err; |
| sscanf(s, "(RPN) frequency: %dMHz", &gf->rpn); |
| |
| s = strstr(s, "(RP1)"); |
| if (s == NULL) |
| goto err; |
| sscanf(s, "(RP1) frequency: %dMHz", &gf->rp1); |
| |
| s = strstr(s, "(RP0)"); |
| if (s == NULL) |
| goto err; |
| sscanf(s, "(RP0) frequency: %dMHz", &gf->rp0); |
| |
| s = strstr(s, "Max"); |
| if (s == NULL) |
| goto err; |
| sscanf(s, "Max overclocked frequency: %dMHz", &gf->max); |
| gf->min = gf->rpn; |
| |
| return 0; |
| |
| err: |
| return gf->error = EIO; |
| } |
| |
| int gpu_freq_update(struct gpu_freq *gf) |
| { |
| char buf[4096], *s; |
| int fd, len = -1; |
| |
| if (gf->error) |
| return gf->error; |
| |
| sprintf(buf, "%s/i915_cur_delayinfo", debugfs_path); |
| fd = open(buf, 0); |
| if (fd < 0) |
| return gf->error = errno; |
| |
| len = read(fd, buf, sizeof(buf)-1); |
| close(fd); |
| if (len < 0) |
| return gf->error = EIO; |
| |
| buf[len] = '\0'; |
| |
| s = strstr(buf, "RPNSWREQ:"); |
| if (s) |
| sscanf(s, "RPNSWREQ: %dMHz", &gf->request); |
| |
| s = strstr(buf, "CAGF:"); |
| if (s) |
| sscanf(s, "CAGF: %dMHz", &gf->current); |
| |
| return 0; |
| } |