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, 681 insertions, 0 deletions

diff --git a/tools/usb/ffs-test.c b/tools/usb/ffs-test.c
new file mode 100644
index 000000000..22b938fbd
--- /dev/null
+++ b/tools/usb/ffs-test.c
@@ -0,0 +1,681 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ffs-test.c -- user mode filesystem api for usb composite function
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *                    Author: Michal Nazarewicz <mina86@mina86.com>
+ */
+
+/* $(CROSS_COMPILE)cc -Wall -Wextra -g -o ffs-test ffs-test.c -lpthread */
+
+
+#define _DEFAULT_SOURCE /* for endian.h */
+
+#include <endian.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <tools/le_byteshift.h>
+
+#include "../../include/uapi/linux/usb/functionfs.h"
+
+
+/******************** Little Endian Handling ********************************/
+
+/*
+ * cpu_to_le16/32 are used when initializing structures, a context where a
+ * function call is not allowed. To solve this, we code cpu_to_le16/32 in a way
+ * that allows them to be used when initializing structures.
+ */
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define cpu_to_le16(x)  (x)
+#define cpu_to_le32(x)  (x)
+#else
+#define cpu_to_le16(x)  ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
+#define cpu_to_le32(x)  \
+	((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >>  8) | \
+	(((x) & 0x0000ff00u) <<  8) | (((x) & 0x000000ffu) << 24))
+#endif
+
+#define le32_to_cpu(x)  le32toh(x)
+#define le16_to_cpu(x)  le16toh(x)
+
+/******************** Messages and Errors ***********************************/
+
+static const char argv0[] = "ffs-test";
+
+static unsigned verbosity = 7;
+
+static void _msg(unsigned level, const char *fmt, ...)
+{
+	if (level < 2)
+		level = 2;
+	else if (level > 7)
+		level = 7;
+
+	if (level <= verbosity) {
+		static const char levels[8][6] = {
+			[2] = "crit:",
+			[3] = "err: ",
+			[4] = "warn:",
+			[5] = "note:",
+			[6] = "info:",
+			[7] = "dbg: "
+		};
+
+		int _errno = errno;
+		va_list ap;
+
+		fprintf(stderr, "%s: %s ", argv0, levels[level]);
+		va_start(ap, fmt);
+		vfprintf(stderr, fmt, ap);
+		va_end(ap);
+
+		if (fmt[strlen(fmt) - 1] != '\n') {
+			char buffer[128];
+			strerror_r(_errno, buffer, sizeof buffer);
+			fprintf(stderr, ": (-%d) %s\n", _errno, buffer);
+		}
+
+		fflush(stderr);
+	}
+}
+
+#define die(...)  (_msg(2, __VA_ARGS__), exit(1))
+#define err(...)   _msg(3, __VA_ARGS__)
+#define warn(...)  _msg(4, __VA_ARGS__)
+#define note(...)  _msg(5, __VA_ARGS__)
+#define info(...)  _msg(6, __VA_ARGS__)
+#define debug(...) _msg(7, __VA_ARGS__)
+
+#define die_on(cond, ...) do { \
+	if (cond) \
+		die(__VA_ARGS__); \
+	} while (0)
+
+
+/******************** Descriptors and Strings *******************************/
+
+static const struct {
+	struct usb_functionfs_descs_head_v2 header;
+	__le32 fs_count;
+	__le32 hs_count;
+	__le32 ss_count;
+	struct {
+		struct usb_interface_descriptor intf;
+		struct usb_endpoint_descriptor_no_audio sink;
+		struct usb_endpoint_descriptor_no_audio source;
+	} __attribute__((packed)) fs_descs, hs_descs;
+	struct {
+		struct usb_interface_descriptor intf;
+		struct usb_endpoint_descriptor_no_audio sink;
+		struct usb_ss_ep_comp_descriptor sink_comp;
+		struct usb_endpoint_descriptor_no_audio source;
+		struct usb_ss_ep_comp_descriptor source_comp;
+	} ss_descs;
+} __attribute__((packed)) descriptors = {
+	.header = {
+		.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
+		.flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
+				     FUNCTIONFS_HAS_HS_DESC |
+				     FUNCTIONFS_HAS_SS_DESC),
+		.length = cpu_to_le32(sizeof descriptors),
+	},
+	.fs_count = cpu_to_le32(3),
+	.fs_descs = {
+		.intf = {
+			.bLength = sizeof descriptors.fs_descs.intf,
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bNumEndpoints = 2,
+			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+			.iInterface = 1,
+		},
+		.sink = {
+			.bLength = sizeof descriptors.fs_descs.sink,
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 1 | USB_DIR_IN,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			/* .wMaxPacketSize = autoconfiguration (kernel) */
+		},
+		.source = {
+			.bLength = sizeof descriptors.fs_descs.source,
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 2 | USB_DIR_OUT,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			/* .wMaxPacketSize = autoconfiguration (kernel) */
+		},
+	},
+	.hs_count = cpu_to_le32(3),
+	.hs_descs = {
+		.intf = {
+			.bLength = sizeof descriptors.fs_descs.intf,
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bNumEndpoints = 2,
+			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+			.iInterface = 1,
+		},
+		.sink = {
+			.bLength = sizeof descriptors.hs_descs.sink,
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 1 | USB_DIR_IN,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			.wMaxPacketSize = cpu_to_le16(512),
+		},
+		.source = {
+			.bLength = sizeof descriptors.hs_descs.source,
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 2 | USB_DIR_OUT,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			.wMaxPacketSize = cpu_to_le16(512),
+			.bInterval = 1, /* NAK every 1 uframe */
+		},
+	},
+	.ss_count = cpu_to_le32(5),
+	.ss_descs = {
+		.intf = {
+			.bLength = sizeof descriptors.fs_descs.intf,
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bNumEndpoints = 2,
+			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+			.iInterface = 1,
+		},
+		.sink = {
+			.bLength = sizeof descriptors.hs_descs.sink,
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 1 | USB_DIR_IN,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			.wMaxPacketSize = cpu_to_le16(1024),
+		},
+		.sink_comp = {
+			.bLength = USB_DT_SS_EP_COMP_SIZE,
+			.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+			.bMaxBurst = 0,
+			.bmAttributes = 0,
+			.wBytesPerInterval = 0,
+		},
+		.source = {
+			.bLength = sizeof descriptors.hs_descs.source,
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 2 | USB_DIR_OUT,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			.wMaxPacketSize = cpu_to_le16(1024),
+			.bInterval = 1, /* NAK every 1 uframe */
+		},
+		.source_comp = {
+			.bLength = USB_DT_SS_EP_COMP_SIZE,
+			.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
+			.bMaxBurst = 0,
+			.bmAttributes = 0,
+			.wBytesPerInterval = 0,
+		},
+	},
+};
+
+static size_t descs_to_legacy(void **legacy, const void *descriptors_v2)
+{
+	const unsigned char *descs_end, *descs_start;
+	__u32 length, fs_count = 0, hs_count = 0, count;
+
+	/* Read v2 header */
+	{
+		const struct {
+			const struct usb_functionfs_descs_head_v2 header;
+			const __le32 counts[];
+		} __attribute__((packed)) *const in = descriptors_v2;
+		const __le32 *counts = in->counts;
+		__u32 flags;
+
+		if (le32_to_cpu(in->header.magic) !=
+		    FUNCTIONFS_DESCRIPTORS_MAGIC_V2)
+			return 0;
+		length = le32_to_cpu(in->header.length);
+		if (length <= sizeof in->header)
+			return 0;
+		length -= sizeof in->header;
+		flags = le32_to_cpu(in->header.flags);
+		if (flags & ~(FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
+			      FUNCTIONFS_HAS_SS_DESC))
+			return 0;
+
+#define GET_NEXT_COUNT_IF_FLAG(ret, flg) do {		\
+			if (!(flags & (flg)))		\
+				break;			\
+			if (length < 4)			\
+				return 0;		\
+			ret = le32_to_cpu(*counts);	\
+			length -= 4;			\
+			++counts;			\
+		} while (0)
+
+		GET_NEXT_COUNT_IF_FLAG(fs_count, FUNCTIONFS_HAS_FS_DESC);
+		GET_NEXT_COUNT_IF_FLAG(hs_count, FUNCTIONFS_HAS_HS_DESC);
+		GET_NEXT_COUNT_IF_FLAG(count, FUNCTIONFS_HAS_SS_DESC);
+
+		count = fs_count + hs_count;
+		if (!count)
+			return 0;
+		descs_start = (const void *)counts;
+
+#undef GET_NEXT_COUNT_IF_FLAG
+	}
+
+	/*
+	 * Find the end of FS and HS USB descriptors.  SS descriptors
+	 * are ignored since legacy format does not support them.
+	 */
+	descs_end = descs_start;
+	do {
+		if (length < *descs_end)
+			return 0;
+		length -= *descs_end;
+		descs_end += *descs_end;
+	} while (--count);
+
+	/* Allocate legacy descriptors and copy the data. */
+	{
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+		struct {
+			struct usb_functionfs_descs_head header;
+			__u8 descriptors[];
+		} __attribute__((packed)) *out;
+#pragma GCC diagnostic pop
+
+		length = sizeof out->header + (descs_end - descs_start);
+		out = malloc(length);
+		out->header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
+		out->header.length = cpu_to_le32(length);
+		out->header.fs_count = cpu_to_le32(fs_count);
+		out->header.hs_count = cpu_to_le32(hs_count);
+		memcpy(out->descriptors, descs_start, descs_end - descs_start);
+		*legacy = out;
+	}
+
+	return length;
+}
+
+
+#define STR_INTERFACE_ "Source/Sink"
+
+static const struct {
+	struct usb_functionfs_strings_head header;
+	struct {
+		__le16 code;
+		const char str1[sizeof STR_INTERFACE_];
+	} __attribute__((packed)) lang0;
+} __attribute__((packed)) strings = {
+	.header = {
+		.magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
+		.length = cpu_to_le32(sizeof strings),
+		.str_count = cpu_to_le32(1),
+		.lang_count = cpu_to_le32(1),
+	},
+	.lang0 = {
+		cpu_to_le16(0x0409), /* en-us */
+		STR_INTERFACE_,
+	},
+};
+
+#define STR_INTERFACE strings.lang0.str1
+
+
+/******************** Files and Threads Handling ****************************/
+
+struct thread;
+
+static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes);
+static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes);
+static ssize_t ep0_consume(struct thread *t, const void *buf, size_t nbytes);
+static ssize_t fill_in_buf(struct thread *t, void *buf, size_t nbytes);
+static ssize_t empty_out_buf(struct thread *t, const void *buf, size_t nbytes);
+
+
+static struct thread {
+	const char *const filename;
+	size_t buf_size;
+
+	ssize_t (*in)(struct thread *, void *, size_t);
+	const char *const in_name;
+
+	ssize_t (*out)(struct thread *, const void *, size_t);
+	const char *const out_name;
+
+	int fd;
+	pthread_t id;
+	void *buf;
+	ssize_t status;
+} threads[] = {
+	{
+		"ep0", 4 * sizeof(struct usb_functionfs_event),
+		read_wrap, NULL,
+		ep0_consume, "<consume>",
+		0, 0, NULL, 0
+	},
+	{
+		"ep1", 8 * 1024,
+		fill_in_buf, "<in>",
+		write_wrap, NULL,
+		0, 0, NULL, 0
+	},
+	{
+		"ep2", 8 * 1024,
+		read_wrap, NULL,
+		empty_out_buf, "<out>",
+		0, 0, NULL, 0
+	},
+};
+
+
+static void init_thread(struct thread *t)
+{
+	t->buf = malloc(t->buf_size);
+	die_on(!t->buf, "malloc");
+
+	t->fd = open(t->filename, O_RDWR);
+	die_on(t->fd < 0, "%s", t->filename);
+}
+
+static void cleanup_thread(void *arg)
+{
+	struct thread *t = arg;
+	int ret, fd;
+
+	fd = t->fd;
+	if (t->fd < 0)
+		return;
+	t->fd = -1;
+
+	/* test the FIFO ioctls (non-ep0 code paths) */
+	if (t != threads) {
+		ret = ioctl(fd, FUNCTIONFS_FIFO_STATUS);
+		if (ret < 0) {
+			/* ENODEV reported after disconnect */
+			if (errno != ENODEV)
+				err("%s: get fifo status", t->filename);
+		} else if (ret) {
+			warn("%s: unclaimed = %d\n", t->filename, ret);
+			if (ioctl(fd, FUNCTIONFS_FIFO_FLUSH) < 0)
+				err("%s: fifo flush", t->filename);
+		}
+	}
+
+	if (close(fd) < 0)
+		err("%s: close", t->filename);
+
+	free(t->buf);
+	t->buf = NULL;
+}
+
+static void *start_thread_helper(void *arg)
+{
+	const char *name, *op, *in_name, *out_name;
+	struct thread *t = arg;
+	ssize_t ret;
+
+	info("%s: starts\n", t->filename);
+	in_name = t->in_name ? t->in_name : t->filename;
+	out_name = t->out_name ? t->out_name : t->filename;
+
+	pthread_cleanup_push(cleanup_thread, arg);
+
+	for (;;) {
+		pthread_testcancel();
+
+		ret = t->in(t, t->buf, t->buf_size);
+		if (ret > 0) {
+			ret = t->out(t, t->buf, ret);
+			name = out_name;
+			op = "write";
+		} else {
+			name = in_name;
+			op = "read";
+		}
+
+		if (ret > 0) {
+			/* nop */
+		} else if (!ret) {
+			debug("%s: %s: EOF", name, op);
+			break;
+		} else if (errno == EINTR || errno == EAGAIN) {
+			debug("%s: %s", name, op);
+		} else {
+			warn("%s: %s", name, op);
+			break;
+		}
+	}
+
+	pthread_cleanup_pop(1);
+
+	t->status = ret;
+	info("%s: ends\n", t->filename);
+	return NULL;
+}
+
+static void start_thread(struct thread *t)
+{
+	debug("%s: starting\n", t->filename);
+
+	die_on(pthread_create(&t->id, NULL, start_thread_helper, t) < 0,
+	       "pthread_create(%s)", t->filename);
+}
+
+static void join_thread(struct thread *t)
+{
+	int ret = pthread_join(t->id, NULL);
+
+	if (ret < 0)
+		err("%s: joining thread", t->filename);
+	else
+		debug("%s: joined\n", t->filename);
+}
+
+
+static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes)
+{
+	return read(t->fd, buf, nbytes);
+}
+
+static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes)
+{
+	return write(t->fd, buf, nbytes);
+}
+
+
+/******************** Empty/Fill buffer routines ****************************/
+
+/* 0 -- stream of zeros, 1 -- i % 63, 2 -- pipe */
+enum pattern { PAT_ZERO, PAT_SEQ, PAT_PIPE };
+static enum pattern pattern;
+
+static ssize_t
+fill_in_buf(struct thread *ignore, void *buf, size_t nbytes)
+{
+	size_t i;
+	__u8 *p;
+
+	(void)ignore;
+
+	switch (pattern) {
+	case PAT_ZERO:
+		memset(buf, 0, nbytes);
+		break;
+
+	case PAT_SEQ:
+		for (p = buf, i = 0; i < nbytes; ++i, ++p)
+			*p = i % 63;
+		break;
+
+	case PAT_PIPE:
+		return fread(buf, 1, nbytes, stdin);
+	}
+
+	return nbytes;
+}
+
+static ssize_t
+empty_out_buf(struct thread *ignore, const void *buf, size_t nbytes)
+{
+	const __u8 *p;
+	__u8 expected;
+	ssize_t ret;
+	size_t len;
+
+	(void)ignore;
+
+	switch (pattern) {
+	case PAT_ZERO:
+		expected = 0;
+		for (p = buf, len = 0; len < nbytes; ++p, ++len)
+			if (*p)
+				goto invalid;
+		break;
+
+	case PAT_SEQ:
+		for (p = buf, len = 0; len < nbytes; ++p, ++len)
+			if (*p != len % 63) {
+				expected = len % 63;
+				goto invalid;
+			}
+		break;
+
+	case PAT_PIPE:
+		ret = fwrite(buf, nbytes, 1, stdout);
+		if (ret > 0)
+			fflush(stdout);
+		break;
+
+invalid:
+		err("bad OUT byte %zd, expected %02x got %02x\n",
+		    len, expected, *p);
+		for (p = buf, len = 0; len < nbytes; ++p, ++len) {
+			if (0 == (len % 32))
+				fprintf(stderr, "%4zd:", len);
+			fprintf(stderr, " %02x", *p);
+			if (31 == (len % 32))
+				fprintf(stderr, "\n");
+		}
+		fflush(stderr);
+		errno = EILSEQ;
+		return -1;
+	}
+
+	return len;
+}
+
+
+/******************** Endpoints routines ************************************/
+
+static void handle_setup(const struct usb_ctrlrequest *setup)
+{
+	printf("bRequestType = %d\n", setup->bRequestType);
+	printf("bRequest     = %d\n", setup->bRequest);
+	printf("wValue       = %d\n", le16_to_cpu(setup->wValue));
+	printf("wIndex       = %d\n", le16_to_cpu(setup->wIndex));
+	printf("wLength      = %d\n", le16_to_cpu(setup->wLength));
+}
+
+static ssize_t
+ep0_consume(struct thread *ignore, const void *buf, size_t nbytes)
+{
+	static const char *const names[] = {
+		[FUNCTIONFS_BIND] = "BIND",
+		[FUNCTIONFS_UNBIND] = "UNBIND",
+		[FUNCTIONFS_ENABLE] = "ENABLE",
+		[FUNCTIONFS_DISABLE] = "DISABLE",
+		[FUNCTIONFS_SETUP] = "SETUP",
+		[FUNCTIONFS_SUSPEND] = "SUSPEND",
+		[FUNCTIONFS_RESUME] = "RESUME",
+	};
+
+	const struct usb_functionfs_event *event = buf;
+	size_t n;
+
+	(void)ignore;
+
+	for (n = nbytes / sizeof *event; n; --n, ++event)
+		switch (event->type) {
+		case FUNCTIONFS_BIND:
+		case FUNCTIONFS_UNBIND:
+		case FUNCTIONFS_ENABLE:
+		case FUNCTIONFS_DISABLE:
+		case FUNCTIONFS_SETUP:
+		case FUNCTIONFS_SUSPEND:
+		case FUNCTIONFS_RESUME:
+			printf("Event %s\n", names[event->type]);
+			if (event->type == FUNCTIONFS_SETUP)
+				handle_setup(&event->u.setup);
+			break;
+
+		default:
+			printf("Event %03u (unknown)\n", event->type);
+		}
+
+	return nbytes;
+}
+
+static void ep0_init(struct thread *t, bool legacy_descriptors)
+{
+	void *legacy;
+	ssize_t ret;
+	size_t len;
+
+	if (legacy_descriptors) {
+		info("%s: writing descriptors\n", t->filename);
+		goto legacy;
+	}
+
+	info("%s: writing descriptors (in v2 format)\n", t->filename);
+	ret = write(t->fd, &descriptors, sizeof descriptors);
+
+	if (ret < 0 && errno == EINVAL) {
+		warn("%s: new format rejected, trying legacy\n", t->filename);
+legacy:
+		len = descs_to_legacy(&legacy, &descriptors);
+		if (len) {
+			ret = write(t->fd, legacy, len);
+			free(legacy);
+		}
+	}
+	die_on(ret < 0, "%s: write: descriptors", t->filename);
+
+	info("%s: writing strings\n", t->filename);
+	ret = write(t->fd, &strings, sizeof strings);
+	die_on(ret < 0, "%s: write: strings", t->filename);
+}
+
+
+/******************** Main **************************************************/
+
+int main(int argc, char **argv)
+{
+	bool legacy_descriptors;
+	unsigned i;
+
+	legacy_descriptors = argc > 2 && !strcmp(argv[1], "-l");
+
+	init_thread(threads);
+	ep0_init(threads, legacy_descriptors);
+
+	for (i = 1; i < sizeof threads / sizeof *threads; ++i)
+		init_thread(threads + i);
+
+	for (i = 1; i < sizeof threads / sizeof *threads; ++i)
+		start_thread(threads + i);
+
+	start_thread_helper(threads);
+
+	for (i = 1; i < sizeof threads / sizeof *threads; ++i)
+		join_thread(threads + i);
+
+	return 0;
+}