tools/dpf: Tool to read and write l3 remap registers.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

tests/dpf_test

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+SOURCE_DIR="$( dirname "${BASH_SOURCE[0]}" )"
+. $SOURCE_DIR/drm_lib.sh
+
+$SOURCE_DIR/../tools/intel_l3_parity -c 2>&1
+$SOURCE_DIR/../tools/intel_l3_parity 0,0,0 2>&1
+$SOURCE_DIR/../tools/intel_l3_parity 2>&1

tools/Makefile.am

@@ -14,7 +14,8 @@ bin_PROGRAMS = 				\
 	intel_reg_snapshot 		\
 	intel_reg_write 		\
 	intel_reg_read 			\
-	intel_forcewaked
+	intel_forcewaked		\
+	intel_l3_parity
 
 noinst_PROGRAMS = 			\
 	intel_dump_decode 		\

tools/intel_l3_parity.c

@@ -0,0 +1,159 @@
+/*
+ * Copyright © 2012 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:
+ *    Ben Widawsky <ben@bwidawsk.net>
+ *
+ */
+
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "intel_chipset.h"
+#include "intel_gpu_tools.h"
+#include "drmtest.h"
+
+#define NUM_BANKS 4
+#define NUM_SUBBANKS 8
+#define NUM_REGS (NUM_BANKS * NUM_SUBBANKS)
+
+struct __attribute__ ((__packed__)) l3_log_register {
+	uint32_t row0_enable	: 1;
+	uint32_t rsvd2		: 4;
+	uint32_t row0		: 11;
+	uint32_t row1_enable	: 1;
+	uint32_t rsvd1		: 4;
+	uint32_t row1		: 11;
+} l3log[NUM_BANKS][NUM_SUBBANKS];
+
+static void dumpit(void)
+{
+	int i, j;
+
+	for (i = 0; i < NUM_BANKS; i++) {
+		for (j = 0; j < NUM_SUBBANKS; j++) {
+			struct l3_log_register *reg = &l3log[i][j];
+
+		if (reg->row0_enable)
+			printf("Row %d, Bank %d, Subbank %d is disabled\n",
+			       reg->row0, i, j);
+		if (reg->row1_enable)
+			printf("Row %d, Bank %d, Subbank %d is disabled\n",
+			       reg->row1, i, j);
+		}
+	}
+}
+
+static int disable_rbs(int row, int bank, int sbank)
+{
+	struct l3_log_register *reg = &l3log[bank][sbank];
+
+	// can't map more than 2 rows
+	if (reg->row0_enable && reg->row1_enable)
+		return -1;
+
+	// can't remap the same row twice
+	if ((reg->row0_enable && reg->row0 == row) ||
+	    (reg->row1_enable && reg->row1 == row)) {
+		return -1;
+	}
+
+	if (reg->row0_enable) {
+		reg->row1 = row;
+		reg->row1_enable = 1;
+	} else {
+		reg->row0 = row;
+		reg->row0_enable = 1;
+	}
+
+	return 0;
+}
+
+static int do_parse(int argc, char *argv[])
+{
+	int row, bank, sbank, i, ret;
+
+	for (i = 1; i < argc; i++) {
+		ret = sscanf(argv[i], "%d,%d,%d", &row, &bank, &sbank);
+		if (ret != 3)
+			return i;
+		assert(disable_rbs(row, bank, sbank) == 0);
+	}
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	const int device = drm_get_card(0);
+	char *path;
+	unsigned int devid;
+	int drm_fd, fd, ret;
+
+	drm_fd = drm_open_any();
+	devid = intel_get_drm_devid(drm_fd);
+
+	ret = asprintf(&path, "/sys/class/drm/card%d/l3_parity", device);
+	assert(ret != -1);
+
+	fd = open(path, O_RDWR);
+	if (fd == -1 && IS_IVYBRIDGE(devid)) {
+		perror("Opening sysfs");
+		exit(EXIT_FAILURE);
+	} else if (fd == -1)
+		exit(EXIT_SUCCESS);
+
+	ret = read(fd, l3log, NUM_REGS * sizeof(uint32_t));
+	if (ret == -1) {
+		perror("Reading sysfs");
+		exit(EXIT_FAILURE);
+	}
+
+	assert(lseek(fd, 0, SEEK_SET) == 0);
+
+	if (argc == 1) {
+		dumpit();
+		exit(EXIT_SUCCESS);
+	} else if (!strncmp("-c", argv[1], 2)) {
+		memset(l3log, 0, sizeof(l3log));
+	} else {
+		ret = do_parse(argc, argv);
+		if (ret != 0) {
+			fprintf(stderr, "Malformed command line at %s\n", argv[ret]);
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	ret = write(fd, l3log, NUM_REGS * sizeof(uint32_t));
+	if (ret == -1) {
+		perror("Writing sysfs");
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+
+	exit(EXIT_SUCCESS);
+}