lib: move prefault helpers to igt_debugfs.c

This way all debugfs library code is in one place, ready for some api
documentation care.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/drmtest.c

@@ -425,44 +425,6 @@ void igt_cleanup_aperture_trashers(void)
 	free(trash_bos);
 }
 
-#define PREFAULT_DEBUGFS "/sys/module/i915/parameters/prefault_disable"
-static void igt_prefault_control(bool enable)
-{
-	const char *name = PREFAULT_DEBUGFS;
-	int fd;
-	char buf[2] = {'Y', 'N'};
-	int index;
-
-	fd = open(name, O_RDWR);
-	igt_require(fd >= 0);
-
-	if (enable)
-		index = 1;
-	else
-		index = 0;
-
-	igt_require(write(fd, &buf[index], 1) == 1);
-
-	close(fd);
-}
-
-static void enable_prefault_at_exit(int sig)
-{
-	igt_enable_prefault();
-}
-
-void igt_disable_prefault(void)
-{
-	igt_prefault_control(false);
-
-	igt_install_exit_handler(enable_prefault_at_exit);
-}
-
-void igt_enable_prefault(void)
-{
-	igt_prefault_control(true);
-}
-
 void igt_system_suspend_autoresume(void)
 {
 	int ret;

lib/drmtest.h

@@ -77,10 +77,6 @@ void igt_cleanup_aperture_trashers(void);
 /* set vt into graphics mode, required to prevent fbcon from interfering */
 void igt_set_vt_graphics_mode(void);
 
-/* prefault disabling, needs the corresponding debugfs interface */
-void igt_disable_prefault(void);
-void igt_enable_prefault(void);
-
 /* suspend and auto-resume system */
 void igt_system_suspend_autoresume(void);
 

lib/igt_debugfs.c

@@ -34,6 +34,9 @@
 #include "igt_display.h"
 #include "igt_debugfs.h"
 
+/*
+ * General debugfs helpers
+ */
 int igt_debugfs_init(igt_debugfs_t *debugfs)
 {
 	const char *path = "/sys/kernel/debug";
@@ -376,3 +379,45 @@ void igt_drop_caches_set(uint64_t val)
 	igt_assert(nbytes == strlen(data) + 1);
 	close(fd);
 }
+
+/*
+ * Prefault control
+ */
+
+#define PREFAULT_DEBUGFS "/sys/module/i915/parameters/prefault_disable"
+static void igt_prefault_control(bool enable)
+{
+	const char *name = PREFAULT_DEBUGFS;
+	int fd;
+	char buf[2] = {'Y', 'N'};
+	int index;
+
+	fd = open(name, O_RDWR);
+	igt_require(fd >= 0);
+
+	if (enable)
+		index = 1;
+	else
+		index = 0;
+
+	igt_require(write(fd, &buf[index], 1) == 1);
+
+	close(fd);
+}
+
+static void enable_prefault_at_exit(int sig)
+{
+	igt_enable_prefault();
+}
+
+void igt_disable_prefault(void)
+{
+	igt_prefault_control(false);
+
+	igt_install_exit_handler(enable_prefault_at_exit);
+}
+
+void igt_enable_prefault(void)
+{
+	igt_prefault_control(true);
+}

lib/igt_debugfs.h

@@ -96,4 +96,12 @@ void igt_pipe_crc_collect_crc(igt_pipe_crc_t *pipe_crc, igt_crc_t *out_crc);
 
 void igt_drop_caches_set(uint64_t val);
 
+/*
+ * Prefault control
+ */
+
+void igt_disable_prefault(void);
+void igt_enable_prefault(void);
+
+
 #endif /* __IGT_DEBUGFS_H__ */

tests/gem_exec_faulting_reloc.c

@@ -41,6 +41,7 @@
 #include "drmtest.h"
 #include "intel_chipset.h"
 #include "intel_gpu_tools.h"
+#include "igt_debugfs.h"
 
 /* Testcase: Submit patches with relocations in memory that will fault
  *

tests/gem_mmap_gtt.c

@@ -38,6 +38,7 @@
 #include "drm.h"
 #include "i915_drm.h"
 #include "drmtest.h"
+#include "igt_debugfs.h"
 
 static int OBJECT_SIZE = 16*1024*1024;