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-rw-r--r--tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c b/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c
new file mode 100644
index 000000000000..87216a0c4a8b
--- /dev/null
+++ b/tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c
@@ -0,0 +1,349 @@
+#define _BSD_SOURCE /* for endian.h */
+
+#include <endian.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/poll.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <sys/eventfd.h>
+
+#include "libaio.h"
+#define IOCB_FLAG_RESFD (1 << 0)
+
+#include <linux/usb/functionfs.h>
+
+#define BUF_LEN 8192
+#define BUFS_MAX 128
+#define AIO_MAX (BUFS_MAX*2)
+
+/******************** Descriptors and Strings *******************************/
+
+static const struct {
+ struct usb_functionfs_descs_head header;
+ struct {
+ struct usb_interface_descriptor intf;
+ struct usb_endpoint_descriptor_no_audio bulk_sink;
+ struct usb_endpoint_descriptor_no_audio bulk_source;
+ } __attribute__ ((__packed__)) fs_descs, hs_descs;
+} __attribute__ ((__packed__)) descriptors = {
+ .header = {
+ .magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC),
+ .length = htole32(sizeof(descriptors)),
+ .fs_count = 3,
+ .hs_count = 3,
+ },
+ .fs_descs = {
+ .intf = {
+ .bLength = sizeof(descriptors.fs_descs.intf),
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .iInterface = 1,
+ },
+ .bulk_sink = {
+ .bLength = sizeof(descriptors.fs_descs.bulk_sink),
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 1 | USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ },
+ .bulk_source = {
+ .bLength = sizeof(descriptors.fs_descs.bulk_source),
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 2 | USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ },
+ },
+ .hs_descs = {
+ .intf = {
+ .bLength = sizeof(descriptors.hs_descs.intf),
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .iInterface = 1,
+ },
+ .bulk_sink = {
+ .bLength = sizeof(descriptors.hs_descs.bulk_sink),
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 1 | USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = htole16(512),
+ },
+ .bulk_source = {
+ .bLength = sizeof(descriptors.hs_descs.bulk_source),
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 2 | USB_DIR_OUT,
+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
+ .wMaxPacketSize = htole16(512),
+ },
+ },
+};
+
+#define STR_INTERFACE "AIO Test"
+
+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 = htole32(FUNCTIONFS_STRINGS_MAGIC),
+ .length = htole32(sizeof(strings)),
+ .str_count = htole32(1),
+ .lang_count = htole32(1),
+ },
+ .lang0 = {
+ htole16(0x0409), /* en-us */
+ STR_INTERFACE,
+ },
+};
+
+/********************** Buffer structure *******************************/
+
+struct io_buffer {
+ struct iocb **iocb;
+ unsigned char **buf;
+ unsigned cnt;
+ unsigned len;
+ unsigned requested;
+};
+
+/******************** Endpoints handling *******************************/
+
+static void display_event(struct usb_functionfs_event *event)
+{
+ 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",
+ };
+ 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]);
+ }
+}
+
+static void handle_ep0(int ep0, bool *ready)
+{
+ int ret;
+ struct usb_functionfs_event event;
+
+ ret = read(ep0, &event, sizeof(event));
+ if (!ret) {
+ perror("unable to read event from ep0");
+ return;
+ }
+ display_event(&event);
+ switch (event.type) {
+ case FUNCTIONFS_SETUP:
+ if (event.u.setup.bRequestType & USB_DIR_IN)
+ write(ep0, NULL, 0);
+ else
+ read(ep0, NULL, 0);
+ break;
+
+ case FUNCTIONFS_ENABLE:
+ *ready = true;
+ break;
+
+ case FUNCTIONFS_DISABLE:
+ *ready = false;
+ break;
+
+ default:
+ break;
+ }
+}
+
+void init_bufs(struct io_buffer *iobuf, unsigned n, unsigned len)
+{
+ unsigned i;
+ iobuf->buf = malloc(n*sizeof(*iobuf->buf));
+ iobuf->iocb = malloc(n*sizeof(*iobuf->iocb));
+ iobuf->cnt = n;
+ iobuf->len = len;
+ iobuf->requested = 0;
+ for (i = 0; i < n; ++i) {
+ iobuf->buf[i] = malloc(len*sizeof(**iobuf->buf));
+ iobuf->iocb[i] = malloc(sizeof(**iobuf->iocb));
+ }
+ iobuf->cnt = n;
+}
+
+void delete_bufs(struct io_buffer *iobuf)
+{
+ unsigned i;
+ for (i = 0; i < iobuf->cnt; ++i) {
+ free(iobuf->buf[i]);
+ free(iobuf->iocb[i]);
+ }
+ free(iobuf->buf);
+ free(iobuf->iocb);
+}
+
+int main(int argc, char *argv[])
+{
+ int ret;
+ unsigned i, j;
+ char *ep_path;
+
+ int ep0, ep1;
+
+ io_context_t ctx;
+
+ int evfd;
+ fd_set rfds;
+
+ struct io_buffer iobuf[2];
+ int actual = 0;
+ bool ready;
+
+ if (argc != 2) {
+ printf("ffs directory not specified!\n");
+ return 1;
+ }
+
+ ep_path = malloc(strlen(argv[1]) + 4 /* "/ep#" */ + 1 /* '\0' */);
+ if (!ep_path) {
+ perror("malloc");
+ return 1;
+ }
+
+ /* open endpoint files */
+ sprintf(ep_path, "%s/ep0", argv[1]);
+ ep0 = open(ep_path, O_RDWR);
+ if (ep0 < 0) {
+ perror("unable to open ep0");
+ return 1;
+ }
+ if (write(ep0, &descriptors, sizeof(descriptors)) < 0) {
+ perror("unable do write descriptors");
+ return 1;
+ }
+ if (write(ep0, &strings, sizeof(strings)) < 0) {
+ perror("unable to write strings");
+ return 1;
+ }
+ sprintf(ep_path, "%s/ep1", argv[1]);
+ ep1 = open(ep_path, O_RDWR);
+ if (ep1 < 0) {
+ perror("unable to open ep1");
+ return 1;
+ }
+
+ free(ep_path);
+
+ memset(&ctx, 0, sizeof(ctx));
+ /* setup aio context to handle up to AIO_MAX requests */
+ if (io_setup(AIO_MAX, &ctx) < 0) {
+ perror("unable to setup aio");
+ return 1;
+ }
+
+ evfd = eventfd(0, 0);
+ if (evfd < 0) {
+ perror("unable to open eventfd");
+ return 1;
+ }
+
+ for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i)
+ init_bufs(&iobuf[i], BUFS_MAX, BUF_LEN);
+
+ while (1) {
+ FD_ZERO(&rfds);
+ FD_SET(ep0, &rfds);
+ FD_SET(evfd, &rfds);
+
+ ret = select(((ep0 > evfd) ? ep0 : evfd)+1,
+ &rfds, NULL, NULL, NULL);
+ if (ret < 0) {
+ if (errno == EINTR)
+ continue;
+ perror("select");
+ break;
+ }
+
+ if (FD_ISSET(ep0, &rfds))
+ handle_ep0(ep0, &ready);
+
+ /* we are waiting for function ENABLE */
+ if (!ready)
+ continue;
+
+ /*
+ * when we're preparing new data to submit,
+ * second buffer being transmitted
+ */
+ for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i) {
+ if (iobuf[i].requested)
+ continue;
+ /* prepare requests */
+ for (j = 0; j < iobuf[i].cnt; ++j) {
+ io_prep_pwrite(iobuf[i].iocb[j], ep1,
+ iobuf[i].buf[j],
+ iobuf[i].len, 0);
+ /* enable eventfd notification */
+ iobuf[i].iocb[j]->u.c.flags |= IOCB_FLAG_RESFD;
+ iobuf[i].iocb[j]->u.c.resfd = evfd;
+ }
+ /* submit table of requests */
+ ret = io_submit(ctx, iobuf[i].cnt, iobuf[i].iocb);
+ if (ret >= 0) {
+ iobuf[i].requested = ret;
+ printf("submit: %d requests buf: %d\n", ret, i);
+ } else
+ perror("unable to submit reqests");
+ }
+
+ /* if event is ready to read */
+ if (!FD_ISSET(evfd, &rfds))
+ continue;
+
+ uint64_t ev_cnt;
+ ret = read(evfd, &ev_cnt, sizeof(ev_cnt));
+ if (ret < 0) {
+ perror("unable to read eventfd");
+ break;
+ }
+
+ struct io_event e[BUFS_MAX];
+ /* we read aio events */
+ ret = io_getevents(ctx, 1, BUFS_MAX, e, NULL);
+ if (ret > 0) /* if we got events */
+ iobuf[actual].requested -= ret;
+
+ /* if all req's from iocb completed */
+ if (!iobuf[actual].requested)
+ actual = (actual + 1)%(sizeof(iobuf)/sizeof(*iobuf));
+ }
+
+ /* free resources */
+
+ for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i)
+ delete_bufs(&iobuf[i]);
+ io_destroy(ctx);
+
+ close(ep1);
+ close(ep0);
+
+ return 0;
+}