13213 Want development driver for accessing AMD DF

Reviewed by: Patrick Mooney <pmooney@pfmooney.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

1 files changed, 118 insertions, 0 deletions

diff --git a/usr/src/cmd/amdzen/udf.c b/usr/src/cmd/amdzen/udf.c
new file mode 100644
index 0000000000..604e0b4802
--- /dev/null
+++ b/usr/src/cmd/amdzen/udf.c
@@ -0,0 +1,118 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2020 Oxide Computer Company
+ */
+
+/*
+ * Facilitate access to the AMD Zen data fabric
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <err.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <strings.h>
+#include <zen_udf.h>
+
+static void
+udf_readone(int fd, uint8_t inst, uint8_t func, uint16_t reg, boolean_t do64)
+{
+	int ret;
+	zen_udf_io_t zui;
+
+	bzero(&zui, sizeof (zui));
+	zui.zui_inst = inst;
+	zui.zui_func = func;
+	zui.zui_reg = reg;
+
+	ret = ioctl(fd, do64 ? ZEN_UDF_READ64 : ZEN_UDF_READ32, &zui);
+	if (ret != 0) {
+		err(EXIT_FAILURE, "failed to issue read ioctl");
+	}
+
+	(void) printf("ifr %x/%x/%x: 0x%" PRIx64 "\n",
+	    inst, func, reg, zui.zui_data);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int c, fd;
+	const char *device = NULL;
+	const char *funcstr = NULL;
+	const char *inststr = NULL;
+	const char *regstr = NULL;
+	uint8_t func, inst;
+	uint16_t reg;
+	unsigned long lval;
+	char *eptr;
+	boolean_t do64 = B_FALSE;
+
+	while ((c = getopt(argc, argv, "d:f:i:r:l")) != -1) {
+		switch (c) {
+		case 'd':
+			device = optarg;
+			break;
+		case 'f':
+			funcstr = optarg;
+			break;
+		case 'i':
+			inststr = optarg;
+			break;
+		case 'l':
+			do64 = B_TRUE;
+			break;
+		case 'r':
+			regstr = optarg;
+			break;
+		}
+	}
+
+	if (device == NULL || funcstr == NULL || inststr == NULL ||
+	    regstr == NULL) {
+		warnx("missing required arguments");
+		(void) fprintf(stderr, "Usage: udf [-l] -d device -f func -i "
+		    "inst -r reg\n");
+	}
+
+	errno = 0;
+	lval = strtoul(funcstr, &eptr, 0);
+	if (errno != 0 || lval > UINT8_MAX || *eptr != '\0') {
+		errx(EXIT_FAILURE, "failed to parse -f: %s", funcstr);
+	}
+	func = (uint8_t)lval;
+
+	lval = strtoul(inststr, &eptr, 0);
+	if (errno != 0 || lval > UINT8_MAX || *eptr != '\0') {
+		errx(EXIT_FAILURE, "failed to parse -i: %s", inststr);
+	}
+	inst = (uint8_t)lval;
+
+	lval = strtoul(regstr, &eptr, 0);
+	if (errno != 0 || lval > UINT16_MAX || *eptr != '\0') {
+		errx(EXIT_FAILURE, "failed to parse -r: %s", regstr);
+	}
+	reg = (uint16_t)lval;
+
+	if ((fd = open(device, O_RDONLY)) < 0) {
+		err(EXIT_FAILURE, "failed to open %s", device);
+	}
+
+	udf_readone(fd, inst, func, reg, do64);
+	(void) close(fd);
+	return (0);
+}