[PATCH 16/50] drm/i915/debugfs: Create generic string tokenize function and update CRC control parsing

[Sagar Arun Kamble]

Input string parsing used in CRC control parameter parsing is generic
and can be reused for other debugfs interfaces. Hence name it as
buffer_tokenize instead of tieing to display_crc. Also fix the function
desciption for CRC control parsing that was misplaced at tokenize function.

Cc: Tomeu Vizoso <tomeu.vizoso at collabora.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
Acked-by: Radoslaw Szwichtenberg <radoslaw.szwichtenberg at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |  1 +
 drivers/gpu/drm/i915/intel_pipe_crc.c | 88 +++++++++++++++++------------------
 2 files changed, 45 insertions(+), 44 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 341f2ba..e45f7a7 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3847,6 +3847,7 @@ u32 i915_gem_fence_alignment(struct drm_i915_private *dev_priv, u32 size,
 int i915_debugfs_register(struct drm_i915_private *dev_priv);
 int i915_debugfs_connector_add(struct drm_connector *connector);
 void intel_display_crc_init(struct drm_i915_private *dev_priv);
+int buffer_tokenize(char *buf, char *words[], int max_words);
 #else
 static inline int i915_debugfs_register(struct drm_i915_private *dev_priv) {return 0;}
 static inline int i915_debugfs_connector_add(struct drm_connector *connector)
diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c b/drivers/gpu/drm/i915/intel_pipe_crc.c
index 96043a5..2e312b8 100644
--- a/drivers/gpu/drm/i915/intel_pipe_crc.c
+++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
@@ -710,49 +710,6 @@ static int pipe_crc_set_source(struct drm_i915_private *dev_priv,
 	return ret;
 }
 
-/*
- * Parse pipe CRC command strings:
- *   command: wsp* object wsp+ name wsp+ source wsp*
- *   object: 'pipe'
- *   name: (A | B | C)
- *   source: (none | plane1 | plane2 | pf)
- *   wsp: (#0x20 | #0x9 | #0xA)+
- *
- * eg.:
- *  "pipe A plane1"  ->  Start CRC computations on plane1 of pipe A
- *  "pipe A none"    ->  Stop CRC
- */
-static int display_crc_ctl_tokenize(char *buf, char *words[], int max_words)
-{
-	int n_words = 0;
-
-	while (*buf) {
-		char *end;
-
-		/* skip leading white space */
-		buf = skip_spaces(buf);
-		if (!*buf)
-			break;	/* end of buffer */
-
-		/* find end of word */
-		for (end = buf; *end && !isspace(*end); end++)
-			;
-
-		if (n_words == max_words) {
-			DRM_DEBUG_DRIVER("too many words, allowed <= %d\n",
-					 max_words);
-			return -EINVAL;	/* ran out of words[] before bytes */
-		}
-
-		if (*end)
-			*end++ = '\0';
-		words[n_words++] = buf;
-		buf = end;
-	}
-
-	return n_words;
-}
-
 enum intel_pipe_crc_object {
 	PIPE_CRC_OBJECT_PIPE,
 };
@@ -806,6 +763,49 @@ static int display_crc_ctl_parse_pipe(const char *buf, enum pipe *pipe)
 	return -EINVAL;
 }
 
+int buffer_tokenize(char *buf, char *words[], int max_words)
+{
+	int n_words = 0;
+
+	while (*buf) {
+		char *end;
+
+		/* skip leading white space */
+		buf = skip_spaces(buf);
+		if (!*buf)
+			break;	/* end of buffer */
+
+		/* find end of word */
+		for (end = buf; *end && !isspace(*end); end++)
+			;
+
+		if (n_words == max_words) {
+			DRM_DEBUG_DRIVER("too many words, allowed <= %d\n",
+					 max_words);
+			return -EINVAL;	/* ran out of words[] before bytes */
+		}
+
+		if (*end)
+			*end++ = '\0';
+		words[n_words++] = buf;
+		buf = end;
+	}
+
+	return n_words;
+}
+
+/*
+ * Parse pipe CRC command strings:
+ *   command: wsp* object wsp+ name wsp+ source wsp*
+ *   object: 'pipe'
+ *   name: (A | B | C)
+ *   source: (none | plane1 | plane2 | pf)
+ *   wsp: (#0x20 | #0x9 | #0xA)+
+ *
+ * eg.:
+ *  "pipe A plane1"  ->  Start CRC computations on plane1 of pipe A
+ *  "pipe A none"    ->  Stop CRC
+ */
 static int display_crc_ctl_parse(struct drm_i915_private *dev_priv,
 				 char *buf, size_t len)
 {
@@ -816,7 +816,7 @@ static int display_crc_ctl_parse(struct drm_i915_private *dev_priv,
 	enum intel_pipe_crc_object object;
 	enum intel_pipe_crc_source source;
 
-	n_words = display_crc_ctl_tokenize(buf, words, N_WORDS);
+	n_words = buffer_tokenize(buf, words, N_WORDS);
 	if (n_words != N_WORDS) {
 		DRM_DEBUG_DRIVER("tokenize failed, a command is %d words\n",
 				 N_WORDS);
-- 
1.9.1