Merge branch 'for-6.15/amd_sfh' into for-linus

From: Mario Limonciello <mario.limonciello@amd.com>

Some platforms include a human presence detection (HPD) sensor. When
enabled and a user is detected a wake event will be emitted from the
sensor fusion hub that software can react to.

Example use cases are "wake from suspend on approach" or to "lock
when leaving".

This is currently enabled by default on supported systems, but users
can't control it. This essentially means that wake on approach is
enabled which is a really surprising behavior to users that don't
expect it.

Instead of defaulting to enabled add a sysfs knob that users can
use to enable the feature if desirable and set it to disabled by
default.

1 files changed, 91 insertions, 1 deletions

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 27c82cfb7e7de..b1abb34d7818d 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <errno.h>
+#include <linux/kconfig.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <inttypes.h>
@@ -8,6 +9,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/param.h>
+#include <sys/utsname.h>
 #include <perf/cpumap.h>
 #include <perf/evlist.h>
 #include <perf/mmap.h>
@@ -176,16 +178,104 @@ static int read_objdump_output(FILE *f, void *buf, size_t *len, u64 start_addr)
 	return err;
 }
 
+/*
+ * Only gets GNU objdump version. Returns 0 for llvm-objdump.
+ */
+static int objdump_version(void)
+{
+	size_t line_len;
+	char cmd[PATH_MAX * 2];
+	char *line = NULL;
+	const char *fmt;
+	FILE *f;
+	int ret;
+
+	int version_tmp, version_num = 0;
+	char *version = 0, *token;
+
+	fmt = "%s --version";
+	ret = snprintf(cmd, sizeof(cmd), fmt, test_objdump_path);
+	if (ret <= 0 || (size_t)ret >= sizeof(cmd))
+		return -1;
+	/* Ignore objdump errors */
+	strcat(cmd, " 2>/dev/null");
+	f = popen(cmd, "r");
+	if (!f) {
+		pr_debug("popen failed\n");
+		return -1;
+	}
+	/* Get first line of objdump --version output */
+	ret = getline(&line, &line_len, f);
+	pclose(f);
+	if (ret < 0) {
+		pr_debug("getline failed\n");
+		return -1;
+	}
+
+	token = strsep(&line, " ");
+	if (token != NULL && !strcmp(token, "GNU")) {
+		// version is last part of first line of objdump --version output.
+		while ((token = strsep(&line, " ")))
+			version = token;
+
+		// Convert version into a format we can compare with
+		token = strsep(&version, ".");
+		version_num = atoi(token);
+		if (version_num)
+			version_num *= 10000;
+
+		token = strsep(&version, ".");
+		version_tmp = atoi(token);
+		if (token)
+			version_num += version_tmp * 100;
+
+		token = strsep(&version, ".");
+		version_tmp = atoi(token);
+		if (token)
+			version_num += version_tmp;
+	}
+
+	return version_num;
+}
+
 static int read_via_objdump(const char *filename, u64 addr, void *buf,
 			    size_t len)
 {
+	u64 stop_address = addr + len;
+	struct utsname uname_buf;
 	char cmd[PATH_MAX * 2];
 	const char *fmt;
 	FILE *f;
 	int ret;
 
+	ret = uname(&uname_buf);
+	if (ret) {
+		pr_debug("uname failed\n");
+		return -1;
+	}
+
+	if (!strncmp(uname_buf.machine, "riscv", 5)) {
+		int version = objdump_version();
+
+		/* Default to this workaround if version parsing fails */
+		if (version < 0 || version > 24100) {
+			/*
+			 * Starting at riscv objdump version 2.41, dumping in
+			 * the middle of an instruction is not supported. riscv
+			 * instructions are aligned along 2-byte intervals and
+			 * can be either 2-bytes or 4-bytes. This makes it
+			 * possible that the stop-address lands in the middle of
+			 * a 4-byte instruction. Increase the stop_address by
+			 * two to ensure an instruction is not cut in half, but
+			 * leave the len as-is so only the expected number of
+			 * bytes are collected.
+			 */
+			stop_address += 2;
+		}
+	}
+
 	fmt = "%s -z -d --start-address=0x%"PRIx64" --stop-address=0x%"PRIx64" %s";
-	ret = snprintf(cmd, sizeof(cmd), fmt, test_objdump_path, addr, addr + len,
+	ret = snprintf(cmd, sizeof(cmd), fmt, test_objdump_path, addr, stop_address,
 		       filename);
 	if (ret <= 0 || (size_t)ret >= sizeof(cmd))
 		return -1;