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, 465 insertions, 0 deletions

diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
new file mode 100644
index 000000000..63a5c2253
--- /dev/null
+++ b/tools/perf/util/unwind-libdw.c
@@ -0,0 +1,465 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <assert.h>
+#include <linux/compiler.h>
+#include <elfutils/libdw.h>
+#include <elfutils/libdwfl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include "debug.h"
+#include "dso.h"
+#include <dwarf-regs.h>
+#include "unwind.h"
+#include "unwind-libdw.h"
+#include "machine.h"
+#include "map.h"
+#include "symbol.h"
+#include "thread.h"
+#include <linux/types.h>
+#include <linux/zalloc.h>
+#include "event.h"
+#include "perf_regs.h"
+#include "callchain.h"
+#include "util/env.h"
+
+/*
+ * The dwfl thread argument passed to functions like memory_read. Memory has to
+ * be allocated to persist of multiple uses of the dwfl.
+ */
+struct dwfl_ui_thread_info {
+	/* Back link to the dwfl. */
+	Dwfl *dwfl;
+	/* The current unwind info, only 1 is supported. */
+	struct unwind_info *ui;
+};
+
+static char *debuginfo_path;
+
+static int __find_debuginfo(Dwfl_Module *mod __maybe_unused, void **userdata,
+			    const char *modname __maybe_unused, Dwarf_Addr base __maybe_unused,
+			    const char *file_name, const char *debuglink_file __maybe_unused,
+			    GElf_Word debuglink_crc __maybe_unused, char **debuginfo_file_name)
+{
+	const struct dso *dso = *userdata;
+
+	assert(dso);
+	if (dso__symsrc_filename(dso) && strcmp(file_name, dso__symsrc_filename(dso)))
+		*debuginfo_file_name = strdup(dso__symsrc_filename(dso));
+	return -1;
+}
+
+void libdw__invalidate_dwfl(struct maps *maps, void *arg)
+{
+	struct dwfl_ui_thread_info *dwfl_ui_ti = arg;
+
+	if (!dwfl_ui_ti)
+		return;
+
+	assert(dwfl_ui_ti->ui == NULL);
+	maps__set_libdw_addr_space_dwfl(maps, NULL);
+	dwfl_end(dwfl_ui_ti->dwfl);
+	free(dwfl_ui_ti);
+}
+
+static const Dwfl_Callbacks offline_callbacks = {
+	.find_debuginfo		= __find_debuginfo,
+	.debuginfo_path		= &debuginfo_path,
+	.section_address	= dwfl_offline_section_address,
+	// .find_elf is not set as we use dwfl_report_elf() instead.
+};
+
+static int __report_module(struct addr_location *al, u64 ip,
+			    struct unwind_info *ui)
+{
+	Dwfl_Module *mod;
+	struct dso *dso = NULL;
+	Dwarf_Addr base;
+	/*
+	 * Some callers will use al->sym, so we can't just use the
+	 * cheaper thread__find_map() here.
+	 */
+	thread__find_symbol(ui->thread, PERF_RECORD_MISC_USER, ip, al);
+
+	if (al->map)
+		dso = map__dso(al->map);
+
+	if (!dso)
+		return 0;
+
+	/*
+	 * The generated JIT DSO files only map the code segment without
+	 * ELF headers.  Since JIT codes used to be packed in a memory
+	 * segment, calculating the base address using pgoff falls into
+	 * a different code in another DSO.  So just use the map->start
+	 * directly to pick the correct one.
+	 */
+	if (!strncmp(dso__long_name(dso), "/tmp/jitted-", 12))
+		base = map__start(al->map);
+	else
+		base = map__start(al->map) - map__pgoff(al->map);
+
+	mod = dwfl_addrmodule(ui->dwfl, ip);
+	if (mod) {
+		Dwarf_Addr s;
+
+		dwfl_module_info(mod, NULL, &s, NULL, NULL, NULL, NULL, NULL);
+		if (s != base)
+			mod = NULL;
+	}
+
+	if (!mod) {
+		char filename[PATH_MAX];
+
+		__symbol__join_symfs(filename, sizeof(filename), dso__long_name(dso));
+		/* Don't hang up on device files like /dev/dri/renderD128. */
+		if (is_regular_file(filename)) {
+			mod = dwfl_report_elf(ui->dwfl, dso__short_name(dso), filename, -1,
+					      base, false);
+		}
+	}
+	if (!mod) {
+		char filename[PATH_MAX];
+
+		if (dso__build_id_filename(dso, filename, sizeof(filename), false))
+			mod = dwfl_report_elf(ui->dwfl, dso__short_name(dso), filename, -1,
+					      base, false);
+	}
+
+	if (mod) {
+		void **userdatap;
+
+		dwfl_module_info(mod, &userdatap, NULL, NULL, NULL, NULL, NULL, NULL);
+		*userdatap = dso;
+	}
+
+	return mod && dwfl_addrmodule(ui->dwfl, ip) == mod ? 0 : -1;
+}
+
+static int report_module(u64 ip, struct unwind_info *ui)
+{
+	struct addr_location al;
+	int res;
+
+	addr_location__init(&al);
+	res = __report_module(&al, ip, ui);
+	addr_location__exit(&al);
+	return res;
+}
+
+/*
+ * Store all entries within entries array,
+ * we will process it after we finish unwind.
+ */
+static int entry(u64 ip, struct unwind_info *ui)
+
+{
+	struct unwind_entry *e = &ui->entries[ui->idx++];
+	struct addr_location al;
+
+	addr_location__init(&al);
+	if (__report_module(&al, ip, ui)) {
+		addr_location__exit(&al);
+		return -1;
+	}
+
+	e->ip	  = ip;
+	e->ms.thread = thread__get(al.thread);
+	e->ms.map = map__get(al.map);
+	e->ms.sym = al.sym;
+
+	pr_debug("unwind: %s:ip = 0x%" PRIx64 " (0x%" PRIx64 ")\n",
+		 al.sym ? al.sym->name : "''",
+		 ip,
+		 al.map ? map__map_ip(al.map, ip) : (u64) 0);
+	addr_location__exit(&al);
+	return 0;
+}
+
+static pid_t next_thread(Dwfl *dwfl __maybe_unused, void *arg, void **thread_argp)
+{
+	struct dwfl_ui_thread_info *dwfl_ui_ti = arg;
+
+	/* We want only single thread to be processed. */
+	if (*thread_argp != NULL)
+		return 0;
+
+	assert(dwfl_ui_ti->ui != NULL);
+	*thread_argp = arg;
+	return thread__tid(dwfl_ui_ti->ui->thread);
+}
+
+static bool get_thread(Dwfl *dwfl __maybe_unused, pid_t tid, void *arg,
+		       void **thread_argp)
+{
+	struct dwfl_ui_thread_info *dwfl_ui_ti = arg;
+
+	assert(dwfl_ui_ti->ui != NULL);
+	if (tid != thread__tid(dwfl_ui_ti->ui->thread))
+		return false;
+
+	*thread_argp = arg;
+	return true;
+}
+
+static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
+			  Dwarf_Word *data)
+{
+	struct addr_location al;
+	ssize_t size;
+	struct dso *dso;
+
+	addr_location__init(&al);
+	if (!thread__find_map(ui->thread, PERF_RECORD_MISC_USER, addr, &al)) {
+		pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
+		goto out_fail;
+	}
+	dso = map__dso(al.map);
+	if (!dso)
+		goto out_fail;
+
+	size = dso__data_read_addr(dso, al.map, ui->machine, addr, (u8 *) data, sizeof(*data));
+
+	addr_location__exit(&al);
+	return !(size == sizeof(*data));
+out_fail:
+	addr_location__exit(&al);
+	return -1;
+}
+
+static bool memory_read(Dwfl *dwfl __maybe_unused, Dwarf_Addr addr, Dwarf_Word *result,
+			void *arg)
+{
+	struct dwfl_ui_thread_info *dwfl_ui_ti = arg;
+	struct unwind_info *ui = dwfl_ui_ti->ui;
+	struct stack_dump *stack = &ui->sample->user_stack;
+	u64 start, end;
+	int offset;
+	int ret;
+
+	if (!ui->sample->user_regs)
+		return false;
+
+	ret = perf_reg_value(&start, ui->sample->user_regs,
+			     perf_arch_reg_sp(ui->e_machine));
+	if (ret)
+		return false;
+
+	end = start + stack->size;
+
+	/* Check overflow. */
+	if (addr + sizeof(Dwarf_Word) < addr)
+		return false;
+
+	if (addr < start || addr + sizeof(Dwarf_Word) > end) {
+		ret = access_dso_mem(ui, addr, result);
+		if (ret) {
+			pr_debug("unwind: access_mem 0x%" PRIx64 " not inside range"
+				 " 0x%" PRIx64 "-0x%" PRIx64 "\n",
+				addr, start, end);
+			return false;
+		}
+		return true;
+	}
+
+	offset  = addr - start;
+	*result = *(Dwarf_Word *)&stack->data[offset];
+	pr_debug("unwind: access_mem addr 0x%" PRIx64 ", val %lx, offset %d\n",
+		 addr, (unsigned long)*result, offset);
+	return true;
+}
+
+static bool libdw_set_initial_registers(Dwfl_Thread *thread, void *arg)
+{
+	struct dwfl_ui_thread_info *dwfl_ui_ti = arg;
+	struct unwind_info *ui = dwfl_ui_ti->ui;
+	struct regs_dump *user_regs = perf_sample__user_regs(ui->sample);
+	Dwarf_Word *dwarf_regs;
+	int max_dwarf_reg = 0;
+	bool ret;
+	uint16_t e_machine = ui->e_machine;
+	int e_flags = ui->e_flags;
+	uint64_t ip_perf_reg = perf_arch_reg_ip(e_machine);
+	Dwarf_Word val = 0;
+
+
+	/*
+	 * For every possible perf register in the bitmap determine the dwarf
+	 * register and use to compute the max.
+	 */
+	for (int perf_reg = 0; perf_reg < 64; perf_reg++) {
+		if (user_regs->mask & (1ULL << perf_reg)) {
+			int dwarf_reg =
+				get_dwarf_regnum_for_perf_regnum(perf_reg, e_machine,
+								 e_flags,
+								 /*only_libdw_supported=*/true);
+			if (dwarf_reg > max_dwarf_reg)
+				max_dwarf_reg = dwarf_reg;
+		}
+	}
+
+	dwarf_regs = calloc(max_dwarf_reg + 1, sizeof(*dwarf_regs));
+	if (!dwarf_regs)
+		return false;
+
+	for (int perf_reg = 0; perf_reg < 64; perf_reg++) {
+		if (user_regs->mask & (1ULL << perf_reg)) {
+			int dwarf_reg =
+				get_dwarf_regnum_for_perf_regnum(perf_reg, e_machine,
+								 e_flags,
+								 /*only_libdw_supported=*/true);
+			if (dwarf_reg >= 0) {
+				val = 0;
+				if (perf_reg_value(&val, user_regs, perf_reg) == 0)
+					dwarf_regs[dwarf_reg] = val;
+			}
+		}
+	}
+	if (perf_reg_value(&val, user_regs, ip_perf_reg) == 0)
+		dwfl_thread_state_register_pc(thread, val);
+
+	ret = dwfl_thread_state_registers(thread, 0, max_dwarf_reg + 1, dwarf_regs);
+	free(dwarf_regs);
+	return ret;
+}
+
+static const Dwfl_Thread_Callbacks callbacks = {
+	.next_thread           = next_thread,
+	.get_thread            = get_thread,
+	.memory_read           = memory_read,
+	.set_initial_registers = libdw_set_initial_registers,
+};
+
+static int
+frame_callback(Dwfl_Frame *state, void *arg)
+{
+	struct unwind_info *ui = arg;
+	Dwarf_Addr pc;
+	bool isactivation;
+
+	if (!dwfl_frame_pc(state, &pc, NULL)) {
+		if (!ui->best_effort)
+			pr_err("%s", dwfl_errmsg(-1));
+		return DWARF_CB_ABORT;
+	}
+
+	// report the module before we query for isactivation
+	report_module(pc, ui);
+
+	if (!dwfl_frame_pc(state, &pc, &isactivation)) {
+		if (!ui->best_effort)
+			pr_err("%s", dwfl_errmsg(-1));
+		return DWARF_CB_ABORT;
+	}
+
+	if (!isactivation)
+		--pc;
+
+	return entry(pc, ui) || !(--ui->max_stack) ?
+	       DWARF_CB_ABORT : DWARF_CB_OK;
+}
+
+int libdw__get_entries(unwind_entry_cb_t cb, void *arg,
+			struct thread *thread,
+			struct perf_sample *data,
+			int max_stack,
+			bool best_effort)
+{
+	struct maps *maps = thread__maps(thread);
+	struct machine *machine = maps__machine(maps);
+	uint32_t e_flags = 0;
+	uint16_t e_machine = thread__e_machine(thread, machine, &e_flags);
+	struct dwfl_ui_thread_info *dwfl_ui_ti;
+	static struct unwind_info *ui;
+	Dwfl *dwfl;
+	Dwarf_Word ip;
+	int err = -EINVAL, i, entries;
+
+	if (!data->user_regs || !data->user_regs->regs)
+		return 0;
+
+	ui = zalloc(sizeof(*ui) + sizeof(ui->entries[0]) * max_stack);
+	if (!ui)
+		return -ENOMEM;
+
+	*ui = (struct unwind_info){
+		.sample		= data,
+		.thread		= thread,
+		.machine	= machine,
+		.cb		= cb,
+		.arg		= arg,
+		.max_stack	= max_stack,
+		.e_machine	= e_machine,
+		.e_flags	= e_flags,
+		.best_effort    = best_effort
+	};
+
+	dwfl_ui_ti = maps__libdw_addr_space_dwfl(maps);
+	if (dwfl_ui_ti) {
+		dwfl = dwfl_ui_ti->dwfl;
+	} else {
+		dwfl_ui_ti = zalloc(sizeof(*dwfl_ui_ti));
+		dwfl = dwfl_begin(&offline_callbacks);
+		if (!dwfl)
+			goto out;
+
+		dwfl_ui_ti->dwfl = dwfl;
+		maps__set_libdw_addr_space_dwfl(maps, dwfl_ui_ti);
+	}
+	assert(dwfl_ui_ti->ui == NULL);
+	assert(dwfl_ui_ti->dwfl == dwfl);
+	assert(dwfl_ui_ti == maps__libdw_addr_space_dwfl(maps));
+	dwfl_ui_ti->ui = ui;
+	ui->dwfl = dwfl;
+
+	err = perf_reg_value(&ip, data->user_regs, perf_arch_reg_ip(e_machine));
+	if (err)
+		goto out;
+
+	err = report_module(ip, ui);
+	if (err)
+		goto out;
+
+	dwfl_attach_state(dwfl, /*elf=*/NULL, thread__pid(thread), &callbacks,
+			  /* Dwfl thread function argument*/dwfl_ui_ti);
+	// Ignore thread already attached error.
+
+	err = dwfl_getthread_frames(dwfl, thread__tid(thread), frame_callback,
+				    /* Dwfl frame function argument*/ui);
+
+	if (err && ui->max_stack != max_stack)
+		err = 0;
+
+	/*
+	 * Display what we got based on the order setup.
+	 */
+	for (i = 0; i < ui->idx && !err; i++) {
+		int j = i;
+
+		if (callchain_param.order == ORDER_CALLER)
+			j = ui->idx - i - 1;
+
+		err = ui->entries[j].ip ? ui->cb(&ui->entries[j], ui->arg) : 0;
+	}
+
+ out:
+	if (err)
+		pr_debug("unwind: failed with '%s'\n", dwfl_errmsg(-1));
+
+	for (i = 0; i < ui->idx; i++)
+		map_symbol__exit(&ui->entries[i].ms);
+
+	dwfl_ui_ti->ui = NULL;
+	entries = (int)ui->idx;
+	free(ui);
+	/*
+	 * Unwinder return contract:
+	 *  > 0 : unwinding succeeded (stops fallback). If we found frames but hit an error
+	 *        (e.g. truncated stack), report success to preserve existing frames.
+	 *    0 : unwinding failed without yielding frames. Ignore non-fatal errors
+	 *        (e.g. missing debug info, DWARF corruption) to allow fallback unwinder or
+	 *        kernel callchain resolution to proceed.
+	 *  < 0 : fatal error (e.g. -ENOMEM). Aborts unwinding entirely.
+	 */
+	if (err)
+		return (err == -ENOMEM) ? -ENOMEM : (entries > 0 ? 1 : 0);
+	return entries;
+}