From 021aed845303989f5deb40b950e80342531876ce Mon Sep 17 00:00:00 2001 From: Valentina Manea Date: Sat, 8 Mar 2014 14:53:26 +0200 Subject: [PATCH] staging: usbip: userspace: migrate usbip_host_driver to libudev This patch modifies usbip_host_driver to use libudev. Signed-off-by: Valentina Manea Reviewed-by: Shuah Khan Signed-off-by: Greg Kroah-Hartman --- .../usbip/userspace/libsrc/usbip_common.c | 76 ++--- .../usbip/userspace/libsrc/usbip_common.h | 5 +- .../userspace/libsrc/usbip_host_driver.c | 285 ++++++------------ .../userspace/libsrc/usbip_host_driver.h | 7 +- .../usbip/userspace/libsrc/vhci_driver.c | 22 +- drivers/staging/usbip/userspace/src/usbipd.c | 14 +- 6 files changed, 145 insertions(+), 264 deletions(-) diff --git a/drivers/staging/usbip/userspace/libsrc/usbip_common.c b/drivers/staging/usbip/userspace/libsrc/usbip_common.c index 6620d185d4bf..998c11c6b323 100644 --- a/drivers/staging/usbip/userspace/libsrc/usbip_common.c +++ b/drivers/staging/usbip/userspace/libsrc/usbip_common.c @@ -2,6 +2,7 @@ * Copyright (C) 2005-2007 Takahiro Hirofuchi */ +#include #include "usbip_common.h" #include "names.h" @@ -12,6 +13,8 @@ int usbip_use_syslog; int usbip_use_stderr; int usbip_use_debug; +extern struct udev *udev_context; + struct speed_string { int num; char *speed; @@ -111,75 +114,48 @@ void dump_usb_device(struct usbip_usb_device *udev) } -int read_attr_value(struct sysfs_device *dev, const char *name, +int read_attr_value(struct udev_device *dev, const char *name, const char *format) { - char attrpath[SYSFS_PATH_MAX]; - struct sysfs_attribute *attr; + const char *attr; int num = 0; int ret; - snprintf(attrpath, sizeof(attrpath), "%s/%s", dev->path, name); - - attr = sysfs_open_attribute(attrpath); + attr = udev_device_get_sysattr_value(dev, name); if (!attr) { - dbg("sysfs_open_attribute failed: %s", attrpath); - return 0; - } - - ret = sysfs_read_attribute(attr); - if (ret < 0) { - dbg("sysfs_read_attribute failed"); + err("udev_device_get_sysattr_value failed"); goto err; } - ret = sscanf(attr->value, format, &num); + ret = sscanf(attr, format, &num); if (ret < 1) { - dbg("sscanf failed"); + err("sscanf failed"); goto err; } err: - sysfs_close_attribute(attr); return num; } -int read_attr_speed(struct sysfs_device *dev) +int read_attr_speed(struct udev_device *dev) { - char attrpath[SYSFS_PATH_MAX]; - struct sysfs_attribute *attr; - char speed[100]; - int ret; - - snprintf(attrpath, sizeof(attrpath), "%s/%s", dev->path, "speed"); - - attr = sysfs_open_attribute(attrpath); - if (!attr) { - dbg("sysfs_open_attribute failed: %s", attrpath); - return 0; - } + const char *speed; - ret = sysfs_read_attribute(attr); - if (ret < 0) { - dbg("sysfs_read_attribute failed"); + speed = udev_device_get_sysattr_value(dev, "speed"); + if (!speed) { + err("udev_device_get_sysattr_value failed"); goto err; } - ret = sscanf(attr->value, "%99s\n", speed); - if (ret < 1) { - dbg("sscanf failed"); - goto err; - } -err: - sysfs_close_attribute(attr); - for (int i = 0; speed_strings[i].speed != NULL; i++) { if (!strcmp(speed, speed_strings[i].speed)) return speed_strings[i].num; } +err: + return USB_SPEED_UNKNOWN; } @@ -190,9 +166,10 @@ err: } while (0) -int read_usb_device(struct sysfs_device *sdev, struct usbip_usb_device *udev) +int read_usb_device(struct udev_device *sdev, struct usbip_usb_device *udev) { uint32_t busnum, devnum; + const char *path, *name; READ_ATTR(udev, uint8_t, sdev, bDeviceClass, "%02x\n"); READ_ATTR(udev, uint8_t, sdev, bDeviceSubClass, "%02x\n"); @@ -209,10 +186,13 @@ int read_usb_device(struct sysfs_device *sdev, struct usbip_usb_device *udev) READ_ATTR(udev, uint8_t, sdev, devnum, "%d\n"); udev->speed = read_attr_speed(sdev); - strncpy(udev->path, sdev->path, SYSFS_PATH_MAX); - strncpy(udev->busid, sdev->name, SYSFS_BUS_ID_SIZE); + path = udev_device_get_syspath(sdev); + name = udev_device_get_sysname(sdev); - sscanf(sdev->name, "%u-%u", &busnum, &devnum); + strncpy(udev->path, path, SYSFS_PATH_MAX); + strncpy(udev->busid, name, SYSFS_BUS_ID_SIZE); + + sscanf(name, "%u-%u", &busnum, &devnum); udev->busnum = busnum; return 0; @@ -222,13 +202,13 @@ int read_usb_interface(struct usbip_usb_device *udev, int i, struct usbip_usb_interface *uinf) { char busid[SYSFS_BUS_ID_SIZE]; - struct sysfs_device *sif; + struct udev_device *sif; sprintf(busid, "%s:%d.%d", udev->busid, udev->bConfigurationValue, i); - sif = sysfs_open_device("usb", busid); + sif = udev_device_new_from_subsystem_sysname(udev_context, "usb", busid); if (!sif) { - dbg("sysfs_open_device(\"usb\", \"%s\") failed", busid); + err("udev_device_new_from_subsystem_sysname %s failed", busid); return -1; } @@ -236,8 +216,6 @@ int read_usb_interface(struct usbip_usb_device *udev, int i, READ_ATTR(uinf, uint8_t, sif, bInterfaceSubClass, "%02x\n"); READ_ATTR(uinf, uint8_t, sif, bInterfaceProtocol, "%02x\n"); - sysfs_close_device(sif); - return 0; } diff --git a/drivers/staging/usbip/userspace/libsrc/usbip_common.h b/drivers/staging/usbip/userspace/libsrc/usbip_common.h index d313e127d2ab..ed9b43bdc500 100644 --- a/drivers/staging/usbip/userspace/libsrc/usbip_common.h +++ b/drivers/staging/usbip/userspace/libsrc/usbip_common.h @@ -6,6 +6,7 @@ #define __USBIP_COMMON_H #include +#include #include #include @@ -118,8 +119,8 @@ struct usbip_usb_device { void dump_usb_interface(struct usbip_usb_interface *); void dump_usb_device(struct usbip_usb_device *); -int read_usb_device(struct sysfs_device *sdev, struct usbip_usb_device *udev); -int read_attr_value(struct sysfs_device *dev, const char *name, +int read_usb_device(struct udev_device *sdev, struct usbip_usb_device *udev); +int read_attr_value(struct udev_device *dev, const char *name, const char *format); int read_usb_interface(struct usbip_usb_device *udev, int i, struct usbip_usb_interface *uinf); diff --git a/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.c b/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.c index 35b2f5b0e350..c5bf60b135b9 100644 --- a/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.c +++ b/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.c @@ -18,102 +18,65 @@ #include #include +#include #include #include +#include + #include "usbip_common.h" #include "usbip_host_driver.h" +#include "list.h" +#include "sysfs_utils.h" #undef PROGNAME #define PROGNAME "libusbip" struct usbip_host_driver *host_driver; - -#define SYSFS_OPEN_RETRIES 100 +struct udev *udev_context; static int32_t read_attr_usbip_status(struct usbip_usb_device *udev) { - char attrpath[SYSFS_PATH_MAX]; - struct sysfs_attribute *attr; + char status_attr_path[SYSFS_PATH_MAX]; + int fd; + int length; + char status; int value = 0; - int rc; - struct stat s; - int retries = SYSFS_OPEN_RETRIES; - - /* This access is racy! - * - * Just after detach, our driver removes the sysfs - * files and recreates them. - * - * We may try and fail to open the usbip_status of - * an exported device in the (short) window where - * it has been removed and not yet recreated. - * - * This is a bug in the interface. Nothing we can do - * except work around it here by polling for the sysfs - * usbip_status to reappear. - */ - - snprintf(attrpath, SYSFS_PATH_MAX, "%s/usbip_status", - udev->path); - - while (retries > 0) { - if (stat(attrpath, &s) == 0) - break; - - if (errno != ENOENT) { - dbg("stat failed: %s", attrpath); - return -1; - } - - usleep(10000); /* 10ms */ - retries--; - } - if (retries == 0) - dbg("usbip_status not ready after %d retries", - SYSFS_OPEN_RETRIES); - else if (retries < SYSFS_OPEN_RETRIES) - dbg("warning: usbip_status ready after %d retries", - SYSFS_OPEN_RETRIES - retries); + snprintf(status_attr_path, SYSFS_PATH_MAX, "%s/usbip_status", + udev->path); - attr = sysfs_open_attribute(attrpath); - if (!attr) { - dbg("sysfs_open_attribute failed: %s", attrpath); + if ((fd = open(status_attr_path, O_RDONLY)) < 0) { + err("error opening attribute %s", status_attr_path); return -1; } - rc = sysfs_read_attribute(attr); - if (rc) { - dbg("sysfs_read_attribute failed: %s", attrpath); - sysfs_close_attribute(attr); + length = read(fd, &status, 1); + if (length < 0) { + err("error reading attribute %s", status_attr_path); + close(fd); return -1; } - value = atoi(attr->value); - - sysfs_close_attribute(attr); + value = atoi(&status); return value; } -static struct usbip_exported_device *usbip_exported_device_new(char *sdevpath) +static +struct usbip_exported_device *usbip_exported_device_new(const char *sdevpath) { struct usbip_exported_device *edev = NULL; struct usbip_exported_device *edev_old; size_t size; int i; - edev = calloc(1, sizeof(*edev)); - if (!edev) { - dbg("calloc failed"); - return NULL; - } + edev = calloc(1, sizeof(struct usbip_exported_device)); - edev->sudev = sysfs_open_device_path(sdevpath); + edev->sudev = udev_device_new_from_syspath(udev_context, sdevpath); if (!edev->sudev) { - dbg("sysfs_open_device_path failed: %s", sdevpath); + err("udev_device_new_from_syspath: %s", sdevpath); goto err; } @@ -124,7 +87,7 @@ static struct usbip_exported_device *usbip_exported_device_new(char *sdevpath) goto err; /* reallocate buffer to include usb interface data */ - size = sizeof(*edev) + edev->udev.bNumInterfaces * + size = sizeof(struct usbip_exported_device) + edev->udev.bNumInterfaces * sizeof(struct usbip_usb_interface); edev_old = edev; @@ -140,149 +103,88 @@ static struct usbip_exported_device *usbip_exported_device_new(char *sdevpath) return edev; err: - if (edev && edev->sudev) - sysfs_close_device(edev->sudev); + if (edev->sudev) + udev_device_unref(edev->sudev); if (edev) free(edev); return NULL; } -static int check_new(struct dlist *dlist, struct sysfs_device *target) -{ - struct sysfs_device *dev; - - dlist_for_each_data(dlist, dev, struct sysfs_device) { - if (!strncmp(dev->bus_id, target->bus_id, SYSFS_BUS_ID_SIZE)) - /* device found and is not new */ - return 0; - } - return 1; -} - -static void delete_nothing(void *unused_data) -{ - /* - * NOTE: Do not delete anything, but the container will be deleted. - */ - (void) unused_data; -} - static int refresh_exported_devices(void) { - /* sysfs_device of usb_device */ - struct sysfs_device *sudev; - struct dlist *sudev_list; - struct dlist *sudev_unique_list; struct usbip_exported_device *edev; - - sudev_unique_list = dlist_new_with_delete(sizeof(struct sysfs_device), - delete_nothing); - - sudev_list = sysfs_get_driver_devices(host_driver->sysfs_driver); - - if (!sudev_list) { - /* - * Not an error condition. There are simply no devices bound to - * the driver yet. - */ - dbg("bind " USBIP_HOST_DRV_NAME ".ko to a usb device to be " - "exportable!"); - return 0; - } - - dlist_for_each_data(sudev_list, sudev, struct sysfs_device) - if (check_new(sudev_unique_list, sudev)) - dlist_unshift(sudev_unique_list, sudev); - - dlist_for_each_data(sudev_unique_list, sudev, struct sysfs_device) { - edev = usbip_exported_device_new(sudev->path); - - if (!edev) { - dbg("usbip_exported_device_new failed"); - continue; + struct udev_enumerate *enumerate; + struct udev_list_entry *devices, *dev_list_entry; + struct udev_device *dev; + const char *path; + + enumerate = udev_enumerate_new(udev_context); + udev_enumerate_add_match_subsystem(enumerate, "usb"); + udev_enumerate_scan_devices(enumerate); + + devices = udev_enumerate_get_list_entry(enumerate); + + udev_list_entry_foreach(dev_list_entry, devices) { + path = udev_list_entry_get_name(dev_list_entry); + dev = udev_device_new_from_syspath(udev_context, path); + + /* Check whether device uses usbip-host driver. */ + if (!strcmp(udev_device_get_driver(dev), + USBIP_HOST_DRV_NAME)) { + edev = usbip_exported_device_new(path); + if (!edev) { + dbg("usbip_exported_device_new failed"); + continue; + } + + list_add(&edev->node, &host_driver->edev_list); + host_driver->ndevs++; } - - dlist_unshift(host_driver->edev_list, edev); - host_driver->ndevs++; } - dlist_destroy(sudev_unique_list); - return 0; } -static struct sysfs_driver *open_sysfs_host_driver(void) +static void usbip_exported_device_destroy(void) { - char bus_type[] = "usb"; - char sysfs_mntpath[SYSFS_PATH_MAX]; - char host_drv_path[SYSFS_PATH_MAX]; - struct sysfs_driver *host_drv; - int rc; - - rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX); - if (rc < 0) { - dbg("sysfs_get_mnt_path failed"); - return NULL; - } - - snprintf(host_drv_path, SYSFS_PATH_MAX, "%s/%s/%s/%s/%s", - sysfs_mntpath, SYSFS_BUS_NAME, bus_type, SYSFS_DRIVERS_NAME, - USBIP_HOST_DRV_NAME); + struct list_head *i, *tmp; + struct usbip_exported_device *edev; - host_drv = sysfs_open_driver_path(host_drv_path); - if (!host_drv) { - dbg("sysfs_open_driver_path failed"); - return NULL; + list_for_each_safe(i, tmp, &host_driver->edev_list) { + edev = list_entry(i, struct usbip_exported_device, node); + list_del(i); + free(edev); } - - return host_drv; -} - -static void usbip_exported_device_delete(void *dev) -{ - struct usbip_exported_device *edev = dev; - sysfs_close_device(edev->sudev); - free(dev); } int usbip_host_driver_open(void) { int rc; - host_driver = calloc(1, sizeof(*host_driver)); - if (!host_driver) { - dbg("calloc failed"); + udev_context = udev_new(); + if (!udev_context) { + err("udev_new failed"); return -1; } - host_driver->ndevs = 0; - host_driver->edev_list = - dlist_new_with_delete(sizeof(struct usbip_exported_device), - usbip_exported_device_delete); - if (!host_driver->edev_list) { - dbg("dlist_new_with_delete failed"); - goto err_free_host_driver; - } + host_driver = calloc(1, sizeof(*host_driver)); - host_driver->sysfs_driver = open_sysfs_host_driver(); - if (!host_driver->sysfs_driver) - goto err_destroy_edev_list; + host_driver->ndevs = 0; + INIT_LIST_HEAD(&host_driver->edev_list); rc = refresh_exported_devices(); if (rc < 0) - goto err_close_sysfs_driver; + goto err_free_host_driver; return 0; -err_close_sysfs_driver: - sysfs_close_driver(host_driver->sysfs_driver); -err_destroy_edev_list: - dlist_destroy(host_driver->edev_list); err_free_host_driver: free(host_driver); host_driver = NULL; + udev_unref(udev_context); + return -1; } @@ -291,30 +193,22 @@ void usbip_host_driver_close(void) if (!host_driver) return; - if (host_driver->edev_list) - dlist_destroy(host_driver->edev_list); - if (host_driver->sysfs_driver) - sysfs_close_driver(host_driver->sysfs_driver); + usbip_exported_device_destroy(); free(host_driver); host_driver = NULL; + + udev_unref(udev_context); } int usbip_host_refresh_device_list(void) { int rc; - if (host_driver->edev_list) - dlist_destroy(host_driver->edev_list); + usbip_exported_device_destroy(); host_driver->ndevs = 0; - host_driver->edev_list = - dlist_new_with_delete(sizeof(struct usbip_exported_device), - usbip_exported_device_delete); - if (!host_driver->edev_list) { - dbg("dlist_new_with_delete failed"); - return -1; - } + INIT_LIST_HEAD(&host_driver->edev_list); rc = refresh_exported_devices(); if (rc < 0) @@ -326,8 +220,7 @@ int usbip_host_refresh_device_list(void) int usbip_host_export_device(struct usbip_exported_device *edev, int sockfd) { char attr_name[] = "usbip_sockfd"; - char attr_path[SYSFS_PATH_MAX]; - struct sysfs_attribute *attr; + char sockfd_attr_path[SYSFS_PATH_MAX]; char sockfd_buff[30]; int ret; @@ -347,40 +240,32 @@ int usbip_host_export_device(struct usbip_exported_device *edev, int sockfd) } /* only the first interface is true */ - snprintf(attr_path, sizeof(attr_path), "%s/%s", + snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s", edev->udev.path, attr_name); - attr = sysfs_open_attribute(attr_path); - if (!attr) { - dbg("sysfs_open_attribute failed: %s", attr_path); - return -1; - } - snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd); - dbg("write: %s", sockfd_buff); - ret = sysfs_write_attribute(attr, sockfd_buff, strlen(sockfd_buff)); + ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff, + strlen(sockfd_buff)); if (ret < 0) { - dbg("sysfs_write_attribute failed: sockfd %s to %s", - sockfd_buff, attr_path); - goto err_write_sockfd; + err("write_sysfs_attribute failed: sockfd %s to %s", + sockfd_buff, sockfd_attr_path); + return ret; } - dbg("connect: %s", edev->udev.busid); - -err_write_sockfd: - sysfs_close_attribute(attr); + info("connect: %s", edev->udev.busid); return ret; } struct usbip_exported_device *usbip_host_get_device(int num) { + struct list_head *i; struct usbip_exported_device *edev; - struct dlist *dlist = host_driver->edev_list; int cnt = 0; - dlist_for_each_data(dlist, edev, struct usbip_exported_device) { + list_for_each(i, &host_driver->edev_list) { + edev = list_entry(i, struct usbip_exported_device, node); if (num == cnt) return edev; else diff --git a/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.h b/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.h index 34fd14cbfc49..2a31f855c616 100644 --- a/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.h +++ b/drivers/staging/usbip/userspace/libsrc/usbip_host_driver.h @@ -21,18 +21,19 @@ #include #include "usbip_common.h" +#include "list.h" struct usbip_host_driver { int ndevs; - struct sysfs_driver *sysfs_driver; /* list of exported device */ - struct dlist *edev_list; + struct list_head edev_list; }; struct usbip_exported_device { - struct sysfs_device *sudev; + struct udev_device *sudev; int32_t status; struct usbip_usb_device udev; + struct list_head node; struct usbip_usb_interface uinf[]; }; diff --git a/drivers/staging/usbip/userspace/libsrc/vhci_driver.c b/drivers/staging/usbip/userspace/libsrc/vhci_driver.c index d80d37c64cb3..acdcb13f7e4e 100644 --- a/drivers/staging/usbip/userspace/libsrc/vhci_driver.c +++ b/drivers/staging/usbip/userspace/libsrc/vhci_driver.c @@ -6,24 +6,27 @@ #include "vhci_driver.h" #include #include +#include #undef PROGNAME #define PROGNAME "libusbip" struct usbip_vhci_driver *vhci_driver; +struct udev *udev_context; static struct usbip_imported_device * imported_device_init(struct usbip_imported_device *idev, char *busid) { - struct sysfs_device *sudev; + struct udev_device *sudev; - sudev = sysfs_open_device("usb", busid); + sudev = udev_device_new_from_subsystem_sysname(udev_context, + "usb", busid); if (!sudev) { - dbg("sysfs_open_device failed: %s", busid); + dbg("udev_device_new_from_subsystem_sysname failed: %s", busid); goto err; } read_usb_device(sudev, &idev->udev); - sysfs_close_device(sudev); + udev_device_unref(sudev); /* add class devices of this imported device */ struct usbip_class_device *cdev; @@ -410,6 +413,12 @@ int usbip_vhci_driver_open(void) int ret; char hc_busid[SYSFS_BUS_ID_SIZE]; + udev_context = udev_new(); + if (!udev_context) { + err("udev_new failed"); + return -1; + } + vhci_driver = (struct usbip_vhci_driver *) calloc(1, sizeof(*vhci_driver)); if (!vhci_driver) { dbg("calloc failed"); @@ -461,6 +470,9 @@ err: free(vhci_driver); vhci_driver = NULL; + + udev_unref(udev_context); + return -1; } @@ -483,6 +495,8 @@ void usbip_vhci_driver_close() free(vhci_driver); vhci_driver = NULL; + + udev_unref(udev_context); } diff --git a/drivers/staging/usbip/userspace/src/usbipd.c b/drivers/staging/usbip/userspace/src/usbipd.c index 771d6c238297..2cae4ce48d11 100644 --- a/drivers/staging/usbip/userspace/src/usbipd.c +++ b/drivers/staging/usbip/userspace/src/usbipd.c @@ -43,6 +43,7 @@ #include "usbip_host_driver.h" #include "usbip_common.h" #include "usbip_network.h" +#include "list.h" #undef PROGNAME #define PROGNAME "usbipd" @@ -93,6 +94,7 @@ static int recv_request_import(int sockfd) struct op_common reply; struct usbip_exported_device *edev; struct usbip_usb_device pdu_udev; + struct list_head *i; int found = 0; int error = 0; int rc; @@ -107,8 +109,8 @@ static int recv_request_import(int sockfd) } PACK_OP_IMPORT_REQUEST(0, &req); - dlist_for_each_data(host_driver->edev_list, edev, - struct usbip_exported_device) { + list_for_each(i, &host_driver->edev_list) { + edev = list_entry(i, struct usbip_exported_device, node); if (!strncmp(req.busid, edev->udev.busid, SYSFS_BUS_ID_SIZE)) { info("found requested device: %s", req.busid); found = 1; @@ -161,12 +163,12 @@ static int send_reply_devlist(int connfd) struct usbip_usb_device pdu_udev; struct usbip_usb_interface pdu_uinf; struct op_devlist_reply reply; + struct list_head *j; int rc, i; reply.ndev = 0; /* number of exported devices */ - dlist_for_each_data(host_driver->edev_list, edev, - struct usbip_exported_device) { + list_for_each(j, &host_driver->edev_list) { reply.ndev += 1; } info("exportable devices: %d", reply.ndev); @@ -184,8 +186,8 @@ static int send_reply_devlist(int connfd) return -1; } - dlist_for_each_data(host_driver->edev_list, edev, - struct usbip_exported_device) { + list_for_each(j, &host_driver->edev_list) { + edev = list_entry(j, struct usbip_exported_device, node); dump_usb_device(&edev->udev); memcpy(&pdu_udev, &edev->udev, sizeof(pdu_udev)); usbip_net_pack_usb_device(1, &pdu_udev); -- 2.20.1