1#include "gpu.h"
 2#include "common/debug.h"
 3#include "common/io.h"
 4#include "common/strutil.h"
 5
 6#include <fcntl.h>
 7
 8static double parseTZDir(int dfd, FFstrbuf* buffer) {
 9    if (!ffReadFileBufferRelative(dfd, "type", buffer) || !ffStrbufStartsWithS(buffer, "gpu")) {
10        return FF_GPU_TEMP_UNSET;
11    }
12
13    if (!ffReadFileBufferRelative(dfd, "temp", buffer)) {
14        return FF_GPU_TEMP_UNSET;
15    }
16
17    double value = ffStrbufToDouble(buffer, FF_GPU_TEMP_UNSET); // millidegree Celsius
18    if (value == FF_GPU_TEMP_UNSET) {
19        return FF_GPU_TEMP_UNSET;
20    }
21
22    return value / 1000.;
23}
24
25double ffGPUDetectTempFromTZ(void) {
26    FF_AUTO_CLOSE_DIR DIR* dirp = opendir("/sys/class/thermal/");
27    if (dirp) {
28        FF_STRBUF_AUTO_DESTROY buffer = ffStrbufCreate();
29        int dfd = dirfd(dirp);
30        struct dirent* entry;
31        while ((entry = readdir(dirp)) != nullptr) {
32            if (entry->d_name[0] == '.') {
33                continue;
34            }
35            if (!ffStrStartsWith(entry->d_name, "thermal_zone")) {
36                continue;
37            }
38
39            FF_AUTO_CLOSE_FD int subfd = openat(dfd, entry->d_name, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
40            if (subfd < 0) {
41                continue;
42            }
43
44            double result = parseTZDir(subfd, &buffer);
45            if (result != FF_GPU_TEMP_UNSET) {
46                return result;
47            }
48        }
49    }
50    return FF_GPU_TEMP_UNSET;
51}
52
53const char* ffDetectGPUImpl(const FFGPUOptions* options, FFlist* gpus) {
54    FF_UNUSED(options, gpus);
55    FF_DEBUG("No permission. Fallbacks to Vulkan, OpenCL or OpenGL instead");
56    return "No permission. Fallbacks to Vulkan, OpenCL or OpenGL instead";
57}