[PATCH 2/3] [v2] intel_error_decode: HEAD stuff

[ben at bwidawsk.net (Ben Widawsky)]

Show the decoded HEAD value, as well as print the calculated head offset
per ringbuffer.

This will be superceded in the next commit, but that patch is way more
complicated than this one (read: error prone), so I want this here.

Example:
ringbuffer (blitter ring) at 0x00044000; HEAD points to: 0x00044950

v2: Actually make it work for all rings.

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 tools/intel_error_decode.c | 50 ++++++++++++++++++++++++++++++----------------
 1 file changed, 33 insertions(+), 17 deletions(-)

diff --git a/tools/intel_error_decode.c b/tools/intel_error_decode.c
index f554d57..434c13a 100644
--- a/tools/intel_error_decode.c
+++ b/tools/intel_error_decode.c
@@ -55,6 +55,13 @@
 #include "intel_gpu_tools.h"
 #include "instdone.h"
 
+static uint32_t
+print_head(unsigned int reg)
+{
+	printf("    head = 0x%08x, wraps = %d\n", reg & (0x7ffff<<2), reg >> 21);
+	return reg & (0x7ffff<<2);
+}
+
 static void
 print_instdone(uint32_t devid, unsigned int instdone, unsigned int instdone1)
 {
@@ -273,6 +280,20 @@ print_fence(unsigned int devid, uint64_t fence)
 	}
 }
 
+#define MAX_RINGS 10 /* I really hope this never... */
+uint32_t head[MAX_RINGS];
+int head_ndx = 0;
+int num_rings = -1;
+static void print_batch(int is_batch, const char *ring_name, uint32_t gtt_offset)
+{
+	const char *buffer_type[2] = {  "ringbuffer", "batchbuffer" };
+	if (is_batch) {
+		printf("%s (%s) at 0x%08x\n", buffer_type[is_batch], ring_name, gtt_offset);
+	} else {
+		printf("%s (%s) at 0x%08x; HEAD points to: 0x%08x\n", buffer_type[is_batch], ring_name, gtt_offset, head[head_ndx++ % num_rings] + gtt_offset);
+	}
+}
+
 static void
 read_data_file(FILE *file)
 {
@@ -285,7 +306,6 @@ read_data_file(FILE *file)
 	size_t line_size;
 	uint32_t offset, value;
 	uint32_t gtt_offset = 0, new_gtt_offset;
-	const char *buffer_type[2] = {  "ringbuffer", "batchbuffer" };
 	char *ring_name = NULL;
 	int is_batch = 1;
 
@@ -299,14 +319,14 @@ read_data_file(FILE *file)
 			strncpy(new_ring_name, line, dashes - line);
 			new_ring_name[dashes - line - 1] = '\0';
 
+			if (num_rings == -1)
+				num_rings = head_ndx;
+
 			matched = sscanf(dashes, "--- gtt_offset = 0x%08x\n",
 					&new_gtt_offset);
 			if (matched == 1) {
 				if (count) {
-					printf("%s (%s) at 0x%08x:\n",
-							buffer_type[is_batch],
-							ring_name,
-							gtt_offset);
+					print_batch(is_batch, ring_name, gtt_offset);
 					drm_intel_decode_set_batch_pointer(decode_ctx,
 							data, gtt_offset,
 							count);
@@ -324,10 +344,7 @@ read_data_file(FILE *file)
 					&new_gtt_offset);
 			if (matched == 1) {
 				if (count) {
-					printf("%s (%s) at 0x%08x:\n",
-							buffer_type[is_batch],
-							ring_name,
-							gtt_offset);
+					print_batch(is_batch, ring_name, gtt_offset);
 					drm_intel_decode_set_batch_pointer(decode_ctx,
 							data, gtt_offset,
 							count);
@@ -348,10 +365,7 @@ read_data_file(FILE *file)
 
 			/* display reg section is after the ringbuffers, don't mix them */
 			if (count) {
-				printf("%s (%s) at 0x%08x:\n",
-						buffer_type[is_batch],
-						ring_name,
-						gtt_offset);
+				print_batch(is_batch, ring_name, gtt_offset);
 				drm_intel_decode_set_batch_pointer(decode_ctx,
 						data, gtt_offset,
 						count);
@@ -377,6 +391,11 @@ read_data_file(FILE *file)
 				decode_ctx = drm_intel_decode_context_alloc(devid);
 			}
 
+			matched = sscanf(line, "  HEAD: 0x%08x\n", &reg);
+			if (matched == 1) {
+				head[head_ndx++] = print_head(reg);
+			}
+
 			matched = sscanf(line, "  ACTHD: 0x%08x\n", &reg);
 			if (matched == 1)
 				drm_intel_decode_set_head_tail(decode_ctx, reg, 0xffffffff);
@@ -415,10 +434,7 @@ read_data_file(FILE *file)
 	}
 
 	if (count) {
-		printf("%s (%s) at 0x%08x:\n",
-				buffer_type[is_batch],
-				ring_name,
-				gtt_offset);
+		print_batch(is_batch, ring_name, gtt_offset);
 		drm_intel_decode_set_batch_pointer(decode_ctx,
 				data, gtt_offset,
 				count);
-- 
1.8.2.1