V2: add exit handler to enable prefault (Daniel)
Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
---
lib/drmtest.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
lib/drmtest.h | 3 +++
2 files changed, 53 insertions(+)
diff --git a/lib/drmtest.c b/lib/drmtest.c
index 011d8c1..980fa49 100644
--- a/lib/drmtest.c
+++ b/lib/drmtest.c
@@ -1593,3 +1593,53 @@ void kmstest_free_connector_config(struct kmstest_connector_config *config)
drmModeFreeEncoder(config->encoder);
drmModeFreeConnector(config->connector);
}
+
+#define PREFAULT_DEBUGFS "/sys/module/i915/parameters/prefault_disable"
+static int drmtest_prefault_control(bool enable)
+{
+ char *name = PREFAULT_DEBUGFS;
+ int fd;
+ char buf[2] = {'Y', 'N'};
+ int index;
+ int result = 0;
+
+ fd = open(name, O_RDWR);
+ if (fd == -1) {
+ fprintf(stderr, "Couldn't open prefault_debugfs.%s\n",
+ strerror(errno));
+ return -1;
+ }
+
+ if (enable)
+ index = 1;
+ else
+ index = 0;
+
+ if (write(fd, &buf[index], 1) != 1) {
+ fprintf(stderr, "write prefault_debugfs error.%s\n",
+ strerror(errno));
+ result = -1;
+ }
+
+ close(fd);
+
+ return result;
+}
+
+static void enable_prefault_at_exit(int sig)
+{
+ drmtest_enable_prefault();
+}
+
+int drmtest_disable_prefault(void)
+{
+ drmtest_install_exit_handler(enable_prefault_at_exit);
+
+ return drmtest_prefault_control(false);
+}
+
+int drmtest_enable_prefault(void)
+{
+ return drmtest_prefault_control(true);
+}
+
diff --git a/lib/drmtest.h b/lib/drmtest.h
index e3a9275..80b344c 100644
--- a/lib/drmtest.h
+++ b/lib/drmtest.h
@@ -179,3 +179,6 @@ void drmtest_enable_exit_handler(void);
void drmtest_disable_exit_handler(void);
int drmtest_set_vt_graphics_mode(void);
+
+int drmtest_disable_prefault(void);
+int drmtest_enable_prefault(void);
--
1.8.3.2
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