[PATCH i-g-t v10 5/5] tools/gputop.src/gputop: Add command line option for device filter

[Soham Purkait <soham.purkait@intel.com>]

With a new command-line option for device filtering, the engine
busyness for the specific device could be selected.

Signed-off-by: Soham Purkait <soham.purkait@intel.com>
---
 tools/gputop.src/gputop.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/gputop.src/gputop.c b/tools/gputop.src/gputop.c
index 479897f40..a2e3578cc 100644
--- a/tools/gputop.src/gputop.c
+++ b/tools/gputop.src/gputop.c
@@ -610,6 +610,7 @@ struct gputop_args {
 	long n_iter;
 	unsigned long delay_usec;
 	bool verbose;
+	char *device;
 };
 
 static void countdown(const char *msg, const int start_sec)
@@ -651,7 +652,8 @@ static void help(char *full_path)
 	       " non-root mode if neither CAP_PERFMON is set nor perf_event_paranoid is"
 	       " permissive.\n"
 	       "\t-d, --delay =SEC[.TENTHS] iterative delay as SECS [.TENTHS]\n"
-	       "\t-n, --iterations =NUMBER  number of executions\n\n"
+	       "\t-n, --iterations =NUMBER  number of executions\n"
+	       "\t-D, --device              Device filter\n\n"
 	       "Running without root:\n"
 	       "\tAs a non-root user, CAP_PERFMON or perf_event_paranoid is required to\n"
 	       "\taccess engine busyness\n"
@@ -682,12 +684,13 @@ static void help(char *full_path)
 
 static int parse_args(int argc, char * const argv[], struct gputop_args *args)
 {
-	static const char cmdopts_s[] = "hvn:d:";
+	static const char cmdopts_s[] = "hvn:d:D:";
 	static const struct option cmdopts[] = {
 	       {"help", no_argument, 0, 'h'},
 	       {"delay", required_argument, 0, 'd'},
 	       {"iterations", required_argument, 0, 'n'},
 	       {"verbose", no_argument, 0, 'v'},
+	       {"device", required_argument, 0, 'D'},
 	       { }
 	};
 
@@ -696,6 +699,7 @@ static int parse_args(int argc, char * const argv[], struct gputop_args *args)
 	args->n_iter = -1;
 	args->delay_usec = 2 * USEC_PER_SEC;
 	args->verbose = false;
+	args->device = NULL;
 
 	for (;;) {
 		int c, idx = 0;
@@ -722,6 +726,9 @@ static int parse_args(int argc, char * const argv[], struct gputop_args *args)
 				return -1;
 			}
 			break;
+		case 'D':
+			args->device = optarg;
+			break;
 		case 'h':
 			help(argv[0]);
 			return 0;
@@ -763,7 +770,8 @@ int main(int argc, char **argv)
 
 	n = args.n_iter;
 	period_us = args.delay_usec;
-	populate_device_instances("device:subsystem=pci,card=all");
+	populate_device_instances(args.device ? args.device
+				  : "device:subsystem=pci,card=all");
 
 	for (int i = 0; drivers[i]; i++) {
 		if (!per_driver_contexts[i].device_present)
-- 
2.34.1