Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 540 insertions, 0 deletions

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
new file mode 100644
index 000000000..2692b2e40
--- /dev/null
+++ b/tools/perf/builtin-help.c
@@ -0,0 +1,540 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * builtin-help.c
+ *
+ * Builtin help command
+ */
+#include "util/cache.h"
+#include "util/config.h"
+#include "util/strbuf.h"
+#include "builtin.h"
+#include <subcmd/exec-cmd.h>
+#include <subcmd/parse-options.h>
+#include <subcmd/run-command.h>
+#include <subcmd/help.h>
+#include "util/debug.h"
+#include "util/util.h"
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/zalloc.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+static struct man_viewer_list {
+	struct man_viewer_list *next;
+	char name[0];
+} *man_viewer_list;
+
+static struct man_viewer_info_list {
+	struct man_viewer_info_list *next;
+	const char *info;
+	char name[0];
+} *man_viewer_info_list;
+
+enum help_format {
+	HELP_FORMAT_NONE,
+	HELP_FORMAT_MAN,
+	HELP_FORMAT_INFO,
+	HELP_FORMAT_WEB,
+};
+
+static enum help_format parse_help_format(const char *format)
+{
+	if (!strcmp(format, "man"))
+		return HELP_FORMAT_MAN;
+	if (!strcmp(format, "info"))
+		return HELP_FORMAT_INFO;
+	if (!strcmp(format, "web") || !strcmp(format, "html"))
+		return HELP_FORMAT_WEB;
+
+	pr_err("unrecognized help format '%s'", format);
+	return HELP_FORMAT_NONE;
+}
+
+static const char *get_man_viewer_info(const char *name)
+{
+	struct man_viewer_info_list *viewer;
+
+	for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) {
+		if (!strcasecmp(name, viewer->name))
+			return viewer->info;
+	}
+	return NULL;
+}
+
+static int check_emacsclient_version(void)
+{
+	struct strbuf buffer = STRBUF_INIT;
+	struct child_process ec_process;
+	const char *argv_ec[] = { "emacsclient", "--version", NULL };
+	int version;
+	int ret = -1;
+
+	/* emacsclient prints its version number on stderr */
+	memset(&ec_process, 0, sizeof(ec_process));
+	ec_process.argv = argv_ec;
+	ec_process.err = -1;
+	ec_process.stdout_to_stderr = 1;
+	if (start_command(&ec_process)) {
+		fprintf(stderr, "Failed to start emacsclient.\n");
+		return -1;
+	}
+	if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
+		fprintf(stderr, "Failed to read emacsclient version\n");
+		goto out;
+	}
+	close(ec_process.err);
+
+	/*
+	 * Don't bother checking return value, because "emacsclient --version"
+	 * seems to always exits with code 1.
+	 */
+	finish_command(&ec_process);
+
+	if (!strstarts(buffer.buf, "emacsclient")) {
+		fprintf(stderr, "Failed to parse emacsclient version.\n");
+		goto out;
+	}
+
+	version = atoi(buffer.buf + strlen("emacsclient"));
+
+	if (version < 22) {
+		fprintf(stderr,
+			"emacsclient version '%d' too old (< 22).\n",
+			version);
+	} else
+		ret = 0;
+out:
+	strbuf_release(&buffer);
+	return ret;
+}
+
+static void exec_failed(const char *cmd)
+{
+	char sbuf[STRERR_BUFSIZE];
+	pr_warning("failed to exec '%s': %s", cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
+}
+
+static void exec_woman_emacs(const char *path, const char *page)
+{
+	if (!check_emacsclient_version()) {
+		/* This works only with emacsclient version >= 22. */
+		char *man_page;
+
+		if (!path)
+			path = "emacsclient";
+		if (asprintf(&man_page, "(woman \"%s\")", page) > 0) {
+			execlp(path, "emacsclient", "-e", man_page, NULL);
+			free(man_page);
+		}
+		exec_failed(path);
+	}
+}
+
+static void exec_man_konqueror(const char *path, const char *page)
+{
+	const char *display = getenv("DISPLAY");
+
+	if (display && *display) {
+		char *man_page;
+		const char *filename = "kfmclient";
+
+		/* It's simpler to launch konqueror using kfmclient. */
+		if (path) {
+			const char *file = strrchr(path, '/');
+			if (file && !strcmp(file + 1, "konqueror")) {
+				char *new = strdup(path);
+				char *dest = strrchr(new, '/');
+
+				/* strlen("konqueror") == strlen("kfmclient") */
+				strcpy(dest + 1, "kfmclient");
+				path = new;
+			}
+			if (file)
+				filename = file;
+		} else
+			path = "kfmclient";
+		if (asprintf(&man_page, "man:%s(1)", page) > 0) {
+			execlp(path, filename, "newTab", man_page, NULL);
+			free(man_page);
+		}
+		exec_failed(path);
+	}
+}
+
+static void exec_man_man(const char *path, const char *page)
+{
+	if (!path)
+		path = "man";
+	execlp(path, "man", page, NULL);
+	exec_failed(path);
+}
+
+static void exec_man_cmd(const char *cmd, const char *page)
+{
+	char *shell_cmd;
+
+	if (asprintf(&shell_cmd, "%s %s", cmd, page) > 0) {
+		execl("/bin/sh", "sh", "-c", shell_cmd, NULL);
+		free(shell_cmd);
+	}
+	exec_failed(cmd);
+}
+
+static void add_man_viewer(const char *name)
+{
+	struct man_viewer_list **p = &man_viewer_list;
+	size_t len = strlen(name);
+
+	while (*p)
+		p = &((*p)->next);
+	*p = zalloc(sizeof(**p) + len + 1);
+	strcpy((*p)->name, name);
+}
+
+static int supported_man_viewer(const char *name, size_t len)
+{
+	return (!strncasecmp("man", name, len) ||
+		!strncasecmp("woman", name, len) ||
+		!strncasecmp("konqueror", name, len));
+}
+
+static void do_add_man_viewer_info(const char *name,
+				   size_t len,
+				   const char *value)
+{
+	struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1);
+
+	strncpy(new->name, name, len);
+	new->info = strdup(value);
+	new->next = man_viewer_info_list;
+	man_viewer_info_list = new;
+}
+
+static void unsupported_man_viewer(const char *name, const char *var)
+{
+	pr_warning("'%s': path for unsupported man viewer.\n"
+		   "Please consider using 'man.<tool>.%s' instead.", name, var);
+}
+
+static int add_man_viewer_path(const char *name,
+			       size_t len,
+			       const char *value)
+{
+	if (supported_man_viewer(name, len))
+		do_add_man_viewer_info(name, len, value);
+	else
+		unsupported_man_viewer(name, "cmd");
+
+	return 0;
+}
+
+static int add_man_viewer_cmd(const char *name,
+			      size_t len,
+			      const char *value)
+{
+	if (supported_man_viewer(name, len))
+		unsupported_man_viewer(name, "path");
+	else
+		do_add_man_viewer_info(name, len, value);
+
+	return 0;
+}
+
+static int add_man_viewer_info(const char *var, const char *value)
+{
+	const char *name = var + 4;
+	const char *subkey = strrchr(name, '.');
+
+	if (!subkey) {
+		pr_err("Config with no key for man viewer: %s", name);
+		return -1;
+	}
+
+	if (!strcmp(subkey, ".path")) {
+		if (!value)
+			return config_error_nonbool(var);
+		return add_man_viewer_path(name, subkey - name, value);
+	}
+	if (!strcmp(subkey, ".cmd")) {
+		if (!value)
+			return config_error_nonbool(var);
+		return add_man_viewer_cmd(name, subkey - name, value);
+	}
+
+	pr_warning("'%s': unsupported man viewer sub key.", subkey);
+	return 0;
+}
+
+static int perf_help_config(const char *var, const char *value, void *cb)
+{
+	enum help_format *help_formatp = cb;
+
+	if (!strcmp(var, "help.format")) {
+		if (!value)
+			return config_error_nonbool(var);
+		*help_formatp = parse_help_format(value);
+		if (*help_formatp == HELP_FORMAT_NONE)
+			return -1;
+		return 0;
+	}
+	if (!strcmp(var, "man.viewer")) {
+		if (!value)
+			return config_error_nonbool(var);
+		add_man_viewer(value);
+		return 0;
+	}
+	if (strstarts(var, "man."))
+		return add_man_viewer_info(var, value);
+
+	return 0;
+}
+
+static struct cmdnames main_cmds, other_cmds;
+
+void list_common_cmds_help(void)
+{
+	const struct cmdname_help {
+		const char *name;
+		const char *help;
+	} common_cmds[] = {
+		{"annotate", "Read perf.data (created by perf record) and display annotated code"},
+		{"archive",
+		 "Create archive with object files with build-ids found in perf.data file"},
+		{"bench", "General framework for benchmark suites"},
+		{"buildid-cache", "Manage build-id cache."},
+		{"buildid-list", "List the buildids in a perf.data file"},
+		{"c2c", "Shared Data C2C/HITM Analyzer."},
+		{"config", "Get and set variables in a configuration file."},
+		{"daemon", "Run record sessions on background"},
+		{"data", "Data file related processing"},
+		{"diff", "Read perf.data files and display the differential profile"},
+		{"evlist", "List the event names in a perf.data file"},
+		{"ftrace", "simple wrapper for kernel's ftrace functionality"},
+		{"inject", "Filter to augment the events stream with additional information"},
+		{"iostat", "Show I/O performance metrics"},
+		{"kallsyms", "Searches running kernel for symbols"},
+		{"kvm", "Tool to trace/measure kvm guest os"},
+		{"list", "List all symbolic event types"},
+		{"mem", "Profile memory accesses"},
+		{"record", "Run a command and record its profile into perf.data"},
+		{"report", "Read perf.data (created by perf record) and display the profile"},
+		{"script", "Read perf.data (created by perf record) and display trace output"},
+		{"stat", "Run a command and gather performance counter statistics"},
+		{"test", "Runs sanity tests."},
+		{"top", "System profiling tool."},
+		{"version", "display the version of perf binary"},
+	#ifdef HAVE_LIBELF_SUPPORT
+		{"probe", "Define new dynamic tracepoints"},
+	#endif /* HAVE_LIBELF_SUPPORT */
+	#ifdef HAVE_LIBTRACEEVENT
+		{"trace", "strace inspired tool"},
+		{"kmem", "Tool to trace/measure kernel memory properties"},
+		{"kwork", "Tool to trace/measure kernel work properties (latencies)"},
+		{"lock", "Analyze lock events"},
+		{"sched", "Tool to trace/measure scheduler properties (latencies)"},
+		{"timechart", "Tool to visualize total system behavior during a workload"},
+	#endif /* HAVE_LIBTRACEEVENT */
+	};
+	size_t longest = 0;
+
+	for (size_t i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+		if (longest < strlen(common_cmds[i].name))
+			longest = strlen(common_cmds[i].name);
+	}
+
+	puts(" The most commonly used perf commands are:");
+	for (size_t i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+		printf("   %-*s   ", (int)longest, common_cmds[i].name);
+		puts(common_cmds[i].help);
+	}
+}
+
+static const char *cmd_to_page(const char *perf_cmd)
+{
+	char *s;
+
+	if (!perf_cmd)
+		return "perf";
+	else if (strstarts(perf_cmd, "perf"))
+		return perf_cmd;
+
+	return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;
+}
+
+static void setup_man_path(void)
+{
+	char *new_path;
+	const char *old_path = getenv("MANPATH");
+
+	/* We should always put ':' after our path. If there is no
+	 * old_path, the ':' at the end will let 'man' to try
+	 * system-wide paths after ours to find the manual page. If
+	 * there is old_path, we need ':' as delimiter. */
+	if (asprintf(&new_path, "%s:%s", system_path(PERF_MAN_PATH), old_path ?: "") > 0) {
+		setenv("MANPATH", new_path, 1);
+		free(new_path);
+	} else {
+		pr_err("Unable to setup man path");
+	}
+}
+
+static void exec_viewer(const char *name, const char *page)
+{
+	const char *info = get_man_viewer_info(name);
+
+	if (!strcasecmp(name, "man"))
+		exec_man_man(info, page);
+	else if (!strcasecmp(name, "woman"))
+		exec_woman_emacs(info, page);
+	else if (!strcasecmp(name, "konqueror"))
+		exec_man_konqueror(info, page);
+	else if (info)
+		exec_man_cmd(info, page);
+	else
+		pr_warning("'%s': unknown man viewer.", name);
+}
+
+static int show_man_page(const char *perf_cmd)
+{
+	struct man_viewer_list *viewer;
+	const char *page = cmd_to_page(perf_cmd);
+	const char *fallback = getenv("PERF_MAN_VIEWER");
+
+	setup_man_path();
+	for (viewer = man_viewer_list; viewer; viewer = viewer->next)
+		exec_viewer(viewer->name, page); /* will return when unable */
+
+	if (fallback)
+		exec_viewer(fallback, page);
+	exec_viewer("man", page);
+
+	pr_err("no man viewer handled the request");
+	return -1;
+}
+
+static int show_info_page(const char *perf_cmd)
+{
+	const char *page = cmd_to_page(perf_cmd);
+	setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
+	execlp("info", "info", "perfman", page, NULL);
+	return -1;
+}
+
+static int get_html_page_path(char **page_path, const char *page)
+{
+	struct stat st;
+	const char *html_path = system_path(PERF_HTML_PATH);
+	char path[PATH_MAX];
+
+	/* Check that we have a perf documentation directory. */
+	if (stat(mkpath(path, sizeof(path), "%s/perf.html", html_path), &st)
+	    || !S_ISREG(st.st_mode)) {
+		pr_err("'%s': not a documentation directory.", html_path);
+		return -1;
+	}
+
+	return asprintf(page_path, "%s/%s.html", html_path, page);
+}
+
+/*
+ * If open_html is not defined in a platform-specific way (see for
+ * example compat/mingw.h), we use the script web--browse to display
+ * HTML.
+ */
+#ifndef open_html
+static void open_html(const char *path)
+{
+	execl_cmd("web--browse", "-c", "help.browser", path, NULL);
+}
+#endif
+
+static int show_html_page(const char *perf_cmd)
+{
+	const char *page = cmd_to_page(perf_cmd);
+	char *page_path; /* it leaks but we exec below */
+
+	if (get_html_page_path(&page_path, page) < 0)
+		return -1;
+
+	open_html(page_path);
+
+	return 0;
+}
+
+int cmd_help(int argc, const char **argv)
+{
+	bool show_all = false;
+	enum help_format help_format = HELP_FORMAT_MAN;
+	struct option builtin_help_options[] = {
+	OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
+	OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
+	OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
+			HELP_FORMAT_WEB),
+	OPT_SET_UINT('i', "info", &help_format, "show info page",
+			HELP_FORMAT_INFO),
+	OPT_END(),
+	};
+	const char * const builtin_help_subcommands[] = {
+		"buildid-cache", "buildid-list", "diff", "evlist", "help", "list",
+		"record", "report", "bench", "stat", "timechart", "top", "annotate",
+		"script", "sched", "kallsyms", "kmem", "lock", "kvm", "test", "inject", "mem", "data",
+#ifdef HAVE_LIBELF_SUPPORT
+		"probe",
+#endif
+		"trace",
+	NULL };
+	const char *builtin_help_usage[] = {
+		"perf help [--all] [--man|--web|--info] [command]",
+		NULL
+	};
+	int rc;
+
+	load_command_list("perf-", &main_cmds, &other_cmds);
+
+	rc = perf_config(perf_help_config, &help_format);
+	if (rc)
+		return rc;
+
+	argc = parse_options_subcommand(argc, argv, builtin_help_options,
+			builtin_help_subcommands, builtin_help_usage, 0);
+
+	if (show_all) {
+		printf("\n Usage: %s\n\n", perf_usage_string);
+		list_commands("perf commands", &main_cmds, &other_cmds);
+		printf(" %s\n\n", perf_more_info_string);
+		return 0;
+	}
+
+	if (!argv[0]) {
+		printf("\n usage: %s\n\n", perf_usage_string);
+		list_common_cmds_help();
+		printf("\n %s\n\n", perf_more_info_string);
+		return 0;
+	}
+
+	switch (help_format) {
+	case HELP_FORMAT_MAN:
+		rc = show_man_page(argv[0]);
+		break;
+	case HELP_FORMAT_INFO:
+		rc = show_info_page(argv[0]);
+		break;
+	case HELP_FORMAT_WEB:
+		rc = show_html_page(argv[0]);
+		break;
+	case HELP_FORMAT_NONE:
+		/* fall-through */
+	default:
+		rc = -1;
+		break;
+	}
+
+	return rc;
+}