Add a GTT dumper for G4x debugging.

src/reg_dumper/Makefile.am

@@ -1,4 +1,9 @@
-noinst_PROGRAMS = intel_reg_dumper intel_idle intel_stepping intel_statuspage intel_hotplug
+noinst_PROGRAMS = intel_reg_dumper \
+	intel_gtt \
+	intel_idle \
+	intel_stepping \
+	intel_statuspage \
+	intel_hotplug
 
 intel_reg_dumper_SOURCES = \
 	main.c \
@@ -6,6 +11,11 @@ intel_reg_dumper_SOURCES = \
 	xprintf.c \
 	../i830_debug.c
 
+intel_gtt_SOURCES = \
+	gtt.c \
+	reg_dumper.h \
+	util.c
+
 intel_idle_SOURCES = \
 	idle.c \
 	reg_dumper.h \
@@ -28,6 +38,7 @@ intel_statuspage_SOURCES = \
 
 intel_hotplug_LDADD = $(PCIACCESS_LIBS)
 intel_reg_dumper_LDADD = $(PCIACCESS_LIBS)
+intel_gtt_LDADD = $(PCIACCESS_LIBS)
 intel_idle_LDADD = $(PCIACCESS_LIBS)
 intel_stepping_LDADD = $(PCIACCESS_LIBS)
 intel_statuspage_LDADD = $(PCIACCESS_LIBS)

src/reg_dumper/gtt.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <pciaccess.h>
+#include <err.h>
+#include <unistd.h>
+
+#include "reg_dumper.h"
+#include "../i810_reg.h"
+
+#define INGTT(offset) INREG(gtt_base + (offset) / (KB(4) / 4))
+
+int main(int argc, char **argv)
+{
+	I830Rec i830;
+	I830Ptr pI830 = &i830;
+	int gtt_base, start, aper_size;
+	intel_i830rec_init(pI830);
+
+	if (IS_G4X(pI830) || IS_GM45(pI830))
+		gtt_base = MB(2);
+	else {
+		printf("Unsupported chipset for gtt dumper\n");
+	}
+
+	aper_size = MB(256);
+	for (start = 0; start < aper_size; start += KB(4)) {
+		uint32_t start_pte = INGTT(start);
+		uint32_t end;
+		int constant_length = 0;
+		int linear_length = 0;
+
+		/* Check if it's a linear sequence */
+		for (end = start + KB(4); end < aper_size; end += KB(4)) {
+			uint32_t end_pte = INGTT(end);
+			if (end_pte == start_pte + (end - start))
+				linear_length++;
+			else
+				break;
+		}
+		if (linear_length > 0) {
+			printf("0x%08x - 0x%08x: linear from "
+			       "0x%08x to 0x%08x\n",
+			       start, end - KB(4),
+			       start_pte, start_pte + (end - start) - KB(4));
+			start = end - KB(4);
+			continue;
+		}
+
+		/* Check if it's a constant sequence */
+		for (end = start + KB(4); end < aper_size; end += KB(4)) {
+			uint32_t end_pte = INGTT(end);
+			if (end_pte == start_pte)
+				constant_length++;
+			else
+				break;
+		}
+		if (constant_length > 0) {
+			printf("0x%08x - 0x%08x: constant 0x%08x\n",
+			       start, end - KB(4),
+			       start_pte);
+			start = end - KB(4);
+			continue;
+		}
+
+		printf("0x%08x: 0x%08x\n", start, start_pte);
+	}
+
+	return 0;
+}