diff options
Diffstat (limited to 'drivers/usb/mon/mon_text.c')
| -rw-r--r-- | drivers/usb/mon/mon_text.c | 522 |
1 files changed, 424 insertions, 98 deletions
diff --git a/drivers/usb/mon/mon_text.c b/drivers/usb/mon/mon_text.c index 611612146ae..ad408251d95 100644 --- a/drivers/usb/mon/mon_text.c +++ b/drivers/usb/mon/mon_text.c @@ -7,7 +7,12 @@ #include <linux/kernel.h> #include <linux/list.h> #include <linux/usb.h> +#include <linux/slab.h> #include <linux/time.h> +#include <linux/export.h> +#include <linux/mutex.h> +#include <linux/debugfs.h> +#include <linux/scatterlist.h> #include <asm/uaccess.h> #include "usb_mon.h" @@ -25,28 +30,52 @@ /* * This limit exists to prevent OOMs when the user process stops reading. + * If usbmon were available to unprivileged processes, it might be open + * to a local DoS. But we have to keep to root in order to prevent + * password sniffing from HID devices. */ -#define EVENT_MAX 25 +#define EVENT_MAX (4*PAGE_SIZE / sizeof(struct mon_event_text)) -#define PRINTF_DFL 130 +/* + * Potentially unlimited number; we limit it for similar allocations. + * The usbfs limits this to 128, but we're not quite as generous. + */ +#define ISODESC_MAX 5 + +#define PRINTF_DFL 250 /* with 5 ISOs segs */ + +struct mon_iso_desc { + int status; + unsigned int offset; + unsigned int length; /* Unsigned here, signed in URB. Historic. */ +}; struct mon_event_text { struct list_head e_link; int type; /* submit, complete, etc. */ - unsigned int pipe; /* Pipe */ unsigned long id; /* From pointer, most of the time */ unsigned int tstamp; + int busnum; + char devnum; + char epnum; + char is_in; + char xfertype; int length; /* Depends on type: xfer length or act length */ int status; + int interval; + int start_frame; + int error_count; char setup_flag; char data_flag; + int numdesc; /* Full number */ + struct mon_iso_desc isodesc[ISODESC_MAX]; unsigned char setup[SETUP_MAX]; unsigned char data[DATA_MAX]; }; #define SLAB_NAME_SZ 30 struct mon_reader_text { - kmem_cache_t *e_slab; + struct kmem_cache *e_slab; int nevents; struct list_head e_list; struct mon_reader r; /* In C, parent class can be placed anywhere */ @@ -54,13 +83,36 @@ struct mon_reader_text { wait_queue_head_t wait; int printf_size; char *printf_buf; - struct semaphore printf_lock; + struct mutex printf_lock; char slab_name[SLAB_NAME_SZ]; }; -static void mon_text_ctor(void *, kmem_cache_t *, unsigned long); -static void mon_text_dtor(void *, kmem_cache_t *, unsigned long); +static struct dentry *mon_dir; /* Usually /sys/kernel/debug/usbmon */ + +static void mon_text_ctor(void *); + +struct mon_text_ptr { + int cnt, limit; + char *pbuf; +}; + +static struct mon_event_text * + mon_text_read_wait(struct mon_reader_text *rp, struct file *file); +static void mon_text_read_head_t(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep); +static void mon_text_read_head_u(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep); +static void mon_text_read_statset(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep); +static void mon_text_read_intstat(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep); +static void mon_text_read_isostat(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep); +static void mon_text_read_isodesc(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep); +static void mon_text_read_data(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep); /* * mon_text_submit @@ -72,14 +124,12 @@ static void mon_text_dtor(void *, kmem_cache_t *, unsigned long); */ static inline char mon_text_get_setup(struct mon_event_text *ep, - struct urb *urb, char ev_type) + struct urb *urb, char ev_type, struct mon_bus *mbus) { - if (!usb_pipecontrol(urb->pipe) || ev_type != 'S') + if (ep->xfertype != USB_ENDPOINT_XFER_CONTROL || ev_type != 'S') return '-'; - if (urb->transfer_flags & URB_NO_SETUP_DMA_MAP) - return mon_dmapeek(ep->setup, urb->setup_dma, SETUP_MAX); if (urb->setup_packet == NULL) return 'Z'; /* '0' would be not as pretty. */ @@ -88,39 +138,39 @@ static inline char mon_text_get_setup(struct mon_event_text *ep, } static inline char mon_text_get_data(struct mon_event_text *ep, struct urb *urb, - int len, char ev_type) + int len, char ev_type, struct mon_bus *mbus) { - int pipe = urb->pipe; + void *src; if (len <= 0) return 'L'; if (len >= DATA_MAX) len = DATA_MAX; - if (usb_pipein(pipe)) { - if (ev_type == 'S') + if (ep->is_in) { + if (ev_type != 'C') return '<'; } else { - if (ev_type == 'C') + if (ev_type != 'S') return '>'; } - /* - * The check to see if it's safe to poke at data has an enormous - * number of corner cases, but it seems that the following is - * more or less safe. - * - * We do not even try to look transfer_buffer, because it can - * contain non-NULL garbage in case the upper level promised to - * set DMA for the HCD. - */ - if (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP) - return mon_dmapeek(ep->data, urb->transfer_dma, len); + if (urb->num_sgs == 0) { + src = urb->transfer_buffer; + if (src == NULL) + return 'Z'; /* '0' would be not as pretty. */ + } else { + struct scatterlist *sg = urb->sg; - if (urb->transfer_buffer == NULL) - return 'Z'; /* '0' would be not as pretty. */ + if (PageHighMem(sg_page(sg))) + return 'D'; + + /* For the text interface we copy only the first sg buffer */ + len = min_t(int, sg->length, len); + src = sg_virt(sg); + } - memcpy(ep->data, urb->transfer_buffer, len); + memcpy(ep->data, src, len); return 0; } @@ -130,36 +180,71 @@ static inline unsigned int mon_get_timestamp(void) unsigned int stamp; do_gettimeofday(&tval); - stamp = tval.tv_sec & 0xFFFF; /* 2^32 = 4294967296. Limit to 4096s. */ + stamp = tval.tv_sec & 0xFFF; /* 2^32 = 4294967296. Limit to 4096s. */ stamp = stamp * 1000000 + tval.tv_usec; return stamp; } static void mon_text_event(struct mon_reader_text *rp, struct urb *urb, - char ev_type) + char ev_type, int status) { struct mon_event_text *ep; unsigned int stamp; + struct usb_iso_packet_descriptor *fp; + struct mon_iso_desc *dp; + int i, ndesc; stamp = mon_get_timestamp(); if (rp->nevents >= EVENT_MAX || - (ep = kmem_cache_alloc(rp->e_slab, SLAB_ATOMIC)) == NULL) { + (ep = kmem_cache_alloc(rp->e_slab, GFP_ATOMIC)) == NULL) { rp->r.m_bus->cnt_text_lost++; return; } ep->type = ev_type; - ep->pipe = urb->pipe; ep->id = (unsigned long) urb; + ep->busnum = urb->dev->bus->busnum; + ep->devnum = urb->dev->devnum; + ep->epnum = usb_endpoint_num(&urb->ep->desc); + ep->xfertype = usb_endpoint_type(&urb->ep->desc); + ep->is_in = usb_urb_dir_in(urb); ep->tstamp = stamp; ep->length = (ev_type == 'S') ? urb->transfer_buffer_length : urb->actual_length; /* Collecting status makes debugging sense for submits, too */ - ep->status = urb->status; + ep->status = status; + + if (ep->xfertype == USB_ENDPOINT_XFER_INT) { + ep->interval = urb->interval; + } else if (ep->xfertype == USB_ENDPOINT_XFER_ISOC) { + ep->interval = urb->interval; + ep->start_frame = urb->start_frame; + ep->error_count = urb->error_count; + } + ep->numdesc = urb->number_of_packets; + if (ep->xfertype == USB_ENDPOINT_XFER_ISOC && + urb->number_of_packets > 0) { + if ((ndesc = urb->number_of_packets) > ISODESC_MAX) + ndesc = ISODESC_MAX; + fp = urb->iso_frame_desc; + dp = ep->isodesc; + for (i = 0; i < ndesc; i++) { + dp->status = fp->status; + dp->offset = fp->offset; + dp->length = (ev_type == 'S') ? + fp->length : fp->actual_length; + fp++; + dp++; + } + /* Wasteful, but simple to understand: ISO 'C' is sparse. */ + if (ev_type == 'C') + ep->length = urb->transfer_buffer_length; + } - ep->setup_flag = mon_text_get_setup(ep, urb, ev_type); - ep->data_flag = mon_text_get_data(ep, urb, ep->length, ev_type); + ep->setup_flag = mon_text_get_setup(ep, urb, ev_type, rp->r.m_bus); + ep->data_flag = mon_text_get_data(ep, urb, ep->length, ev_type, + rp->r.m_bus); rp->nevents++; list_add_tail(&ep->e_link, &rp->e_list); @@ -169,13 +254,43 @@ static void mon_text_event(struct mon_reader_text *rp, struct urb *urb, static void mon_text_submit(void *data, struct urb *urb) { struct mon_reader_text *rp = data; - mon_text_event(rp, urb, 'S'); + mon_text_event(rp, urb, 'S', -EINPROGRESS); } -static void mon_text_complete(void *data, struct urb *urb) +static void mon_text_complete(void *data, struct urb *urb, int status) { struct mon_reader_text *rp = data; - mon_text_event(rp, urb, 'C'); + mon_text_event(rp, urb, 'C', status); +} + +static void mon_text_error(void *data, struct urb *urb, int error) +{ + struct mon_reader_text *rp = data; + struct mon_event_text *ep; + + if (rp->nevents >= EVENT_MAX || + (ep = kmem_cache_alloc(rp->e_slab, GFP_ATOMIC)) == NULL) { + rp->r.m_bus->cnt_text_lost++; + return; + } + + ep->type = 'E'; + ep->id = (unsigned long) urb; + ep->busnum = urb->dev->bus->busnum; + ep->devnum = urb->dev->devnum; + ep->epnum = usb_endpoint_num(&urb->ep->desc); + ep->xfertype = usb_endpoint_type(&urb->ep->desc); + ep->is_in = usb_urb_dir_in(urb); + ep->tstamp = mon_get_timestamp(); + ep->length = 0; + ep->status = error; + + ep->setup_flag = '-'; + ep->data_flag = 'E'; + + rp->nevents++; + list_add_tail(&ep->e_link, &rp->e_list); + wake_up(&rp->wait); } /* @@ -204,23 +319,20 @@ static struct mon_event_text *mon_text_fetch(struct mon_reader_text *rp, static int mon_text_open(struct inode *inode, struct file *file) { struct mon_bus *mbus; - struct usb_bus *ubus; struct mon_reader_text *rp; int rc; - down(&mon_lock); - mbus = inode->u.generic_ip; - ubus = mbus->u_bus; + mutex_lock(&mon_lock); + mbus = inode->i_private; - rp = kmalloc(sizeof(struct mon_reader_text), GFP_KERNEL); + rp = kzalloc(sizeof(struct mon_reader_text), GFP_KERNEL); if (rp == NULL) { rc = -ENOMEM; goto err_alloc; } - memset(rp, 0, sizeof(struct mon_reader_text)); INIT_LIST_HEAD(&rp->e_list); init_waitqueue_head(&rp->wait); - init_MUTEX(&rp->printf_lock); + mutex_init(&rp->printf_lock); rp->printf_size = PRINTF_DFL; rp->printf_buf = kmalloc(rp->printf_size, GFP_KERNEL); @@ -232,13 +344,13 @@ static int mon_text_open(struct inode *inode, struct file *file) rp->r.m_bus = mbus; rp->r.r_data = rp; rp->r.rnf_submit = mon_text_submit; + rp->r.rnf_error = mon_text_error; rp->r.rnf_complete = mon_text_complete; - snprintf(rp->slab_name, SLAB_NAME_SZ, "mon%dt_%lx", ubus->busnum, - (long)rp); + snprintf(rp->slab_name, SLAB_NAME_SZ, "mon_text_%p", rp); rp->e_slab = kmem_cache_create(rp->slab_name, sizeof(struct mon_event_text), sizeof(long), 0, - mon_text_ctor, mon_text_dtor); + mon_text_ctor); if (rp->e_slab == NULL) { rc = -ENOMEM; goto err_slab; @@ -247,7 +359,7 @@ static int mon_text_open(struct inode *inode, struct file *file) mon_reader_add(mbus, &rp->r); file->private_data = rp; - up(&mon_lock); + mutex_unlock(&mon_lock); return 0; // err_busy: @@ -257,7 +369,7 @@ err_slab: err_alloc_pr: kfree(rp); err_alloc: - up(&mon_lock); + mutex_unlock(&mon_lock); return rc; } @@ -267,17 +379,75 @@ err_alloc: * dd if=/dbg/usbmon/0t bs=10 * Also, we do not allow seeks and do not bother advancing the offset. */ -static ssize_t mon_text_read(struct file *file, char __user *buf, +static ssize_t mon_text_read_t(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) { struct mon_reader_text *rp = file->private_data; + struct mon_event_text *ep; + struct mon_text_ptr ptr; + + if (IS_ERR(ep = mon_text_read_wait(rp, file))) + return PTR_ERR(ep); + mutex_lock(&rp->printf_lock); + ptr.cnt = 0; + ptr.pbuf = rp->printf_buf; + ptr.limit = rp->printf_size; + + mon_text_read_head_t(rp, &ptr, ep); + mon_text_read_statset(rp, &ptr, ep); + ptr.cnt += snprintf(ptr.pbuf + ptr.cnt, ptr.limit - ptr.cnt, + " %d", ep->length); + mon_text_read_data(rp, &ptr, ep); + + if (copy_to_user(buf, rp->printf_buf, ptr.cnt)) + ptr.cnt = -EFAULT; + mutex_unlock(&rp->printf_lock); + kmem_cache_free(rp->e_slab, ep); + return ptr.cnt; +} + +static ssize_t mon_text_read_u(struct file *file, char __user *buf, + size_t nbytes, loff_t *ppos) +{ + struct mon_reader_text *rp = file->private_data; + struct mon_event_text *ep; + struct mon_text_ptr ptr; + + if (IS_ERR(ep = mon_text_read_wait(rp, file))) + return PTR_ERR(ep); + mutex_lock(&rp->printf_lock); + ptr.cnt = 0; + ptr.pbuf = rp->printf_buf; + ptr.limit = rp->printf_size; + + mon_text_read_head_u(rp, &ptr, ep); + if (ep->type == 'E') { + mon_text_read_statset(rp, &ptr, ep); + } else if (ep->xfertype == USB_ENDPOINT_XFER_ISOC) { + mon_text_read_isostat(rp, &ptr, ep); + mon_text_read_isodesc(rp, &ptr, ep); + } else if (ep->xfertype == USB_ENDPOINT_XFER_INT) { + mon_text_read_intstat(rp, &ptr, ep); + } else { + mon_text_read_statset(rp, &ptr, ep); + } + ptr.cnt += snprintf(ptr.pbuf + ptr.cnt, ptr.limit - ptr.cnt, + " %d", ep->length); + mon_text_read_data(rp, &ptr, ep); + + if (copy_to_user(buf, rp->printf_buf, ptr.cnt)) + ptr.cnt = -EFAULT; + mutex_unlock(&rp->printf_lock); + kmem_cache_free(rp->e_slab, ep); + return ptr.cnt; +} + +static struct mon_event_text *mon_text_read_wait(struct mon_reader_text *rp, + struct file *file) +{ struct mon_bus *mbus = rp->r.m_bus; DECLARE_WAITQUEUE(waita, current); struct mon_event_text *ep; - int cnt, limit; - char *pbuf; - char udir, utype; - int data_len, i; add_wait_queue(&rp->wait, &waita); set_current_state(TASK_INTERRUPTIBLE); @@ -285,7 +455,7 @@ static ssize_t mon_text_read(struct file *file, char __user *buf, if (file->f_flags & O_NONBLOCK) { set_current_state(TASK_RUNNING); remove_wait_queue(&rp->wait, &waita); - return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ + return ERR_PTR(-EWOULDBLOCK); } /* * We do not count nwaiters, because ->release is supposed @@ -294,32 +464,57 @@ static ssize_t mon_text_read(struct file *file, char __user *buf, schedule(); if (signal_pending(current)) { remove_wait_queue(&rp->wait, &waita); - return -EINTR; + return ERR_PTR(-EINTR); } set_current_state(TASK_INTERRUPTIBLE); } set_current_state(TASK_RUNNING); remove_wait_queue(&rp->wait, &waita); + return ep; +} - down(&rp->printf_lock); - cnt = 0; - pbuf = rp->printf_buf; - limit = rp->printf_size; +static void mon_text_read_head_t(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep) +{ + char udir, utype; - udir = usb_pipein(ep->pipe) ? 'i' : 'o'; - switch (usb_pipetype(ep->pipe)) { - case PIPE_ISOCHRONOUS: utype = 'Z'; break; - case PIPE_INTERRUPT: utype = 'I'; break; - case PIPE_CONTROL: utype = 'C'; break; + udir = (ep->is_in ? 'i' : 'o'); + switch (ep->xfertype) { + case USB_ENDPOINT_XFER_ISOC: utype = 'Z'; break; + case USB_ENDPOINT_XFER_INT: utype = 'I'; break; + case USB_ENDPOINT_XFER_CONTROL: utype = 'C'; break; default: /* PIPE_BULK */ utype = 'B'; } - cnt += snprintf(pbuf + cnt, limit - cnt, + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, "%lx %u %c %c%c:%03u:%02u", ep->id, ep->tstamp, ep->type, - utype, udir, usb_pipedevice(ep->pipe), usb_pipeendpoint(ep->pipe)); + utype, udir, ep->devnum, ep->epnum); +} + +static void mon_text_read_head_u(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep) +{ + char udir, utype; + + udir = (ep->is_in ? 'i' : 'o'); + switch (ep->xfertype) { + case USB_ENDPOINT_XFER_ISOC: utype = 'Z'; break; + case USB_ENDPOINT_XFER_INT: utype = 'I'; break; + case USB_ENDPOINT_XFER_CONTROL: utype = 'C'; break; + default: /* PIPE_BULK */ utype = 'B'; + } + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + "%lx %u %c %c%c:%d:%03u:%u", + ep->id, ep->tstamp, ep->type, + utype, udir, ep->busnum, ep->devnum, ep->epnum); +} + +static void mon_text_read_statset(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep) +{ if (ep->setup_flag == 0) { /* Setup packet is present and captured */ - cnt += snprintf(pbuf + cnt, limit - cnt, + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, " s %02x %02x %04x %04x %04x", ep->setup[0], ep->setup[1], @@ -327,40 +522,86 @@ static ssize_t mon_text_read(struct file *file, char __user *buf, (ep->setup[5] << 8) | ep->setup[4], (ep->setup[7] << 8) | ep->setup[6]); } else if (ep->setup_flag != '-') { /* Unable to capture setup packet */ - cnt += snprintf(pbuf + cnt, limit - cnt, + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, " %c __ __ ____ ____ ____", ep->setup_flag); } else { /* No setup for this kind of URB */ - cnt += snprintf(pbuf + cnt, limit - cnt, " %d", ep->status); + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + " %d", ep->status); + } +} + +static void mon_text_read_intstat(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep) +{ + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + " %d:%d", ep->status, ep->interval); +} + +static void mon_text_read_isostat(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep) +{ + if (ep->type == 'S') { + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + " %d:%d:%d", ep->status, ep->interval, ep->start_frame); + } else { + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + " %d:%d:%d:%d", + ep->status, ep->interval, ep->start_frame, ep->error_count); } - cnt += snprintf(pbuf + cnt, limit - cnt, " %d", ep->length); +} + +static void mon_text_read_isodesc(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep) +{ + int ndesc; /* Display this many */ + int i; + const struct mon_iso_desc *dp; + + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + " %d", ep->numdesc); + ndesc = ep->numdesc; + if (ndesc > ISODESC_MAX) + ndesc = ISODESC_MAX; + if (ndesc < 0) + ndesc = 0; + dp = ep->isodesc; + for (i = 0; i < ndesc; i++) { + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + " %d:%u:%u", dp->status, dp->offset, dp->length); + dp++; + } +} + +static void mon_text_read_data(struct mon_reader_text *rp, + struct mon_text_ptr *p, const struct mon_event_text *ep) +{ + int data_len, i; if ((data_len = ep->length) > 0) { if (ep->data_flag == 0) { - cnt += snprintf(pbuf + cnt, limit - cnt, " ="); + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + " ="); if (data_len >= DATA_MAX) data_len = DATA_MAX; for (i = 0; i < data_len; i++) { if (i % 4 == 0) { - cnt += snprintf(pbuf + cnt, limit - cnt, + p->cnt += snprintf(p->pbuf + p->cnt, + p->limit - p->cnt, " "); } - cnt += snprintf(pbuf + cnt, limit - cnt, + p->cnt += snprintf(p->pbuf + p->cnt, + p->limit - p->cnt, "%02x", ep->data[i]); } - cnt += snprintf(pbuf + cnt, limit - cnt, "\n"); + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, + "\n"); } else { - cnt += snprintf(pbuf + cnt, limit - cnt, + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, " %c\n", ep->data_flag); } } else { - cnt += snprintf(pbuf + cnt, limit - cnt, "\n"); + p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, "\n"); } - - if (copy_to_user(buf, rp->printf_buf, cnt)) - cnt = -EFAULT; - up(&rp->printf_lock); - kmem_cache_free(rp->e_slab, ep); - return cnt; } static int mon_text_release(struct inode *inode, struct file *file) @@ -371,12 +612,12 @@ static int mon_text_release(struct inode *inode, struct file *file) struct list_head *p; struct mon_event_text *ep; - down(&mon_lock); - mbus = inode->u.generic_ip; + mutex_lock(&mon_lock); + mbus = inode->i_private; if (mbus->nreaders <= 0) { printk(KERN_ERR TAG ": consistency error on close\n"); - up(&mon_lock); + mutex_unlock(&mon_lock); return 0; } mon_reader_del(mbus, &rp->r); @@ -402,25 +643,93 @@ static int mon_text_release(struct inode *inode, struct file *file) kfree(rp->printf_buf); kfree(rp); - up(&mon_lock); + mutex_unlock(&mon_lock); return 0; } -struct file_operations mon_fops_text = { +static const struct file_operations mon_fops_text_t = { + .owner = THIS_MODULE, + .open = mon_text_open, + .llseek = no_llseek, + .read = mon_text_read_t, + .release = mon_text_release, +}; + +static const struct file_operations mon_fops_text_u = { .owner = THIS_MODULE, .open = mon_text_open, .llseek = no_llseek, - .read = mon_text_read, - /* .write = mon_text_write, */ - /* .poll = mon_text_poll, */ - /* .ioctl = mon_text_ioctl, */ + .read = mon_text_read_u, .release = mon_text_release, }; +int mon_text_add(struct mon_bus *mbus, const struct usb_bus *ubus) +{ + struct dentry *d; + enum { NAMESZ = 10 }; + char name[NAMESZ]; + int busnum = ubus? ubus->busnum: 0; + int rc; + + if (mon_dir == NULL) + return 0; + + if (ubus != NULL) { + rc = snprintf(name, NAMESZ, "%dt", busnum); + if (rc <= 0 || rc >= NAMESZ) + goto err_print_t; + d = debugfs_create_file(name, 0600, mon_dir, mbus, + &mon_fops_text_t); + if (d == NULL) + goto err_create_t; + mbus->dent_t = d; + } + + rc = snprintf(name, NAMESZ, "%du", busnum); + if (rc <= 0 || rc >= NAMESZ) + goto err_print_u; + d = debugfs_create_file(name, 0600, mon_dir, mbus, &mon_fops_text_u); + if (d == NULL) + goto err_create_u; + mbus->dent_u = d; + + rc = snprintf(name, NAMESZ, "%ds", busnum); + if (rc <= 0 || rc >= NAMESZ) + goto err_print_s; + d = debugfs_create_file(name, 0600, mon_dir, mbus, &mon_fops_stat); + if (d == NULL) + goto err_create_s; + mbus->dent_s = d; + + return 1; + +err_create_s: +err_print_s: + debugfs_remove(mbus->dent_u); + mbus->dent_u = NULL; +err_create_u: +err_print_u: + if (ubus != NULL) { + debugfs_remove(mbus->dent_t); + mbus->dent_t = NULL; + } +err_create_t: +err_print_t: + return 0; +} + +void mon_text_del(struct mon_bus *mbus) +{ + debugfs_remove(mbus->dent_u); + if (mbus->dent_t != NULL) + debugfs_remove(mbus->dent_t); + debugfs_remove(mbus->dent_s); +} + /* * Slab interface: constructor. */ -static void mon_text_ctor(void *mem, kmem_cache_t *slab, unsigned long sflags) +static void mon_text_ctor(void *mem) { /* * Nothing to initialize. No, really! @@ -429,7 +738,24 @@ static void mon_text_ctor(void *mem, kmem_cache_t *slab, unsigned long sflags) memset(mem, 0xe5, sizeof(struct mon_event_text)); } -static void mon_text_dtor(void *mem, kmem_cache_t *slab, unsigned long sflags) +int __init mon_text_init(void) +{ + struct dentry *mondir; + + mondir = debugfs_create_dir("usbmon", usb_debug_root); + if (IS_ERR(mondir)) { + /* debugfs not available, but we can use usbmon without it */ + return 0; + } + if (mondir == NULL) { + printk(KERN_NOTICE TAG ": unable to create usbmon directory\n"); + return -ENOMEM; + } + mon_dir = mondir; + return 0; +} + +void mon_text_exit(void) { - ; + debugfs_remove(mon_dir); } |