Hi Janusz, On 2024-07-18 at 10:55:13 +0200, Janusz Krzysztofik wrote: > On an attempt to resolve the issue of mysteriously failing updates of > sysfs entries representing engine preempt timeout values, add debug > messages to error paths of involved library functions. > > v2: No changes. > v3: Add still more debug messages. > v4: Fix missing line termination. > > Link: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/6268 > Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik@xxxxxxxxxxxxxxx> Reviewed-by: Kamil Konieczny <kamil.konieczny@xxxxxxxxxxxxxxx> > --- > lib/i915/gem_engine_topology.c | 19 +++++++++++-------- > lib/igt_sysfs.c | 4 ++-- > 2 files changed, 13 insertions(+), 10 deletions(-) > > diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c > index afb576afb2..c878e95f08 100644 > --- a/lib/i915/gem_engine_topology.c > +++ b/lib/i915/gem_engine_topology.c > @@ -454,12 +454,12 @@ static int __open_primary(int dir) > int len; > > fd = openat(dir, "dev", O_RDONLY); > - if (fd < 0) > + if (igt_debug_on(fd < 0)) > return dir; > > len = read(fd, buf, sizeof(buf) - 1); > close(fd); > - if (len <= 0) > + if (igt_debug_on(len <= 0)) > return dir; > buf[len] = '\0'; > > @@ -467,7 +467,7 @@ static int __open_primary(int dir) > if (minor < 64) > return dir; > > - if (readlinkat(dir, "device", target, sizeof(target)) < 0) > + if (igt_debug_on(readlinkat(dir, "device", target, sizeof(target)) < 0)) > return dir; > > fd = openat(dir, "..", O_RDONLY); > @@ -500,24 +500,27 @@ static FILE *__open_attr(int dir, const char *mode, ...) > va_list ap; > > /* The attributes are not to be found on render nodes */ > - dir = __open_primary(dir); > + igt_debug_on((dir = __open_primary(dir)) < 0); > > va_start(ap, mode); > while (dir >= 0 && (path = va_arg(ap, const char *))) { > int fd; > > - fd = openat(dir, path, O_RDONLY); > + igt_debug_on_f((fd = openat(dir, path, O_RDONLY)) < 0, > + "failed component: %s\n", path); > close(dir); > > dir = fd; > } > va_end(ap); > + if (dir < 0) > + return NULL; > > if (*mode != 'r') /* clumsy, but fun */ > - dir = reopen(dir, O_RDWR); > + igt_debug_on((dir = reopen(dir, O_RDWR)) < 0); > > file = fdopen(dir, mode); > - if (!file) { > + if (igt_debug_on(!file)) { > close(dir); > return NULL; > } > @@ -554,7 +557,7 @@ int gem_engine_property_printf(int i915, const char *engine, const char *attr, > > file = __open_attr(igt_sysfs_open(i915), "w", > "engine", engine, attr, NULL); > - if (!file) > + if (igt_debug_on(!file)) > return -1; > > va_start(ap, fmt); > diff --git a/lib/igt_sysfs.c b/lib/igt_sysfs.c > index 42b2af41ab..550472d819 100644 > --- a/lib/igt_sysfs.c > +++ b/lib/igt_sysfs.c > @@ -186,7 +186,7 @@ char *igt_sysfs_path(int device, char *path, int pathlen) > snprintf(path, pathlen, "/sys/dev/char/%d:%d", > major(st.st_rdev), minor(st.st_rdev)); > > - if (access(path, F_OK)) > + if (igt_debug_on(access(path, F_OK))) > return NULL; > > return path; > @@ -206,7 +206,7 @@ int igt_sysfs_open(int device) > { > char path[80]; > > - if (!igt_sysfs_path(device, path, sizeof(path))) > + if (igt_debug_on(!igt_sysfs_path(device, path, sizeof(path)))) > return -1; > > return open(path, O_RDONLY); > -- > 2.45.2 >
