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Subject[PATCH 08/27] tools/power/x86/intel-speed-select: Helpful warning for missing kernel interface
Date
When the device file "/dev/isst_interface" is not present, instead of
failing on access, check at the start and print a helpful warning.

Here CLX platform is an exception, which doesn't depend on the device
file. So continue for CLX platform.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
.../x86/intel-speed-select/isst-config.c | 34 +++++++++++++------
1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/tools/power/x86/intel-speed-select/isst-config.c b/tools/power/x86/intel-speed-select/isst-config.c
index 4773970cda9b..9bf461e57a34 100644
--- a/tools/power/x86/intel-speed-select/isst-config.c
+++ b/tools/power/x86/intel-speed-select/isst-config.c
@@ -2408,6 +2408,8 @@ static void print_version(void)

static void cmdline(int argc, char **argv)
{
+ const char *pathname = "/dev/isst_interface";
+ FILE *fp;
int opt;
int option_index = 0;
int ret;
@@ -2423,6 +2425,28 @@ static void cmdline(int argc, char **argv)
{ 0, 0, 0, 0 }
};

+ if (geteuid() != 0) {
+ fprintf(stderr, "Must run as root\n");
+ exit(0);
+ }
+
+ ret = update_cpu_model();
+ if (ret)
+ err(-1, "Invalid CPU model (%d)\n", cpu_model);
+ printf("Intel(R) Speed Select Technology\n");
+ printf("Executing on CPU model:%d[0x%x]\n", cpu_model, cpu_model);
+
+ if (!is_clx_n_platform()) {
+ fp = fopen(pathname, "rb");
+ if (!fp) {
+ fprintf(stderr, "Intel speed select drivers are not loaded on this system.\n");
+ fprintf(stderr, "Verify that kernel config includes CONFIG_INTEL_SPEED_SELECT_INTERFACE.\n");
+ fprintf(stderr, "If the config is included then this is not a supported platform.\n");
+ exit(0);
+ }
+ fclose(fp);
+ }
+
progname = argv[0];
while ((opt = getopt_long_only(argc, argv, "+c:df:hio:v", long_options,
&option_index)) != -1) {
@@ -2457,20 +2481,10 @@ static void cmdline(int argc, char **argv)
}
}

- if (geteuid() != 0) {
- fprintf(stderr, "Must run as root\n");
- exit(0);
- }
-
if (optind > (argc - 2)) {
fprintf(stderr, "Feature name and|or command not specified\n");
exit(0);
}
- ret = update_cpu_model();
- if (ret)
- err(-1, "Invalid CPU model (%d)\n", cpu_model);
- printf("Intel(R) Speed Select Technology\n");
- printf("Executing on CPU model:%d[0x%x]\n", cpu_model, cpu_model);
set_max_cpu_num();
store_cpu_topology();
set_cpu_present_cpu_mask();
--
2.24.1
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