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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. We do need to save the dentries for these files, so keep them around, but no need to check if they are "valid" or not, as the code works just as well either way. Cc: Pete Zaitcev <zaitcev@kotori.zaitcev.us> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Fredrik Noring <noring@nocrew.org> Cc: Kate Stewart <kstewart@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
773 lines
19 KiB
C
773 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* The USB Monitor, inspired by Dave Harding's USBMon.
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*
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* This is a text format reader.
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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#include <linux/sched/signal.h>
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#include <linux/time.h>
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#include <linux/ktime.h>
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#include <linux/export.h>
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#include <linux/mutex.h>
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#include <linux/debugfs.h>
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#include <linux/scatterlist.h>
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#include <linux/uaccess.h>
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#include "usb_mon.h"
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/*
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* No, we do not want arbitrarily long data strings.
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* Use the binary interface if you want to capture bulk data!
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*/
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#define DATA_MAX 32
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/*
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* Defined by USB 2.0 clause 9.3, table 9.2.
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*/
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#define SETUP_MAX 8
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/*
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* This limit exists to prevent OOMs when the user process stops reading.
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* If usbmon were available to unprivileged processes, it might be open
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* to a local DoS. But we have to keep to root in order to prevent
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* password sniffing from HID devices.
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*/
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#define EVENT_MAX (4*PAGE_SIZE / sizeof(struct mon_event_text))
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/*
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* Potentially unlimited number; we limit it for similar allocations.
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* The usbfs limits this to 128, but we're not quite as generous.
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*/
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#define ISODESC_MAX 5
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#define PRINTF_DFL 250 /* with 5 ISOs segs */
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struct mon_iso_desc {
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int status;
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unsigned int offset;
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unsigned int length; /* Unsigned here, signed in URB. Historic. */
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};
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struct mon_event_text {
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struct list_head e_link;
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int type; /* submit, complete, etc. */
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unsigned long id; /* From pointer, most of the time */
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unsigned int tstamp;
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int busnum;
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char devnum;
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char epnum;
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char is_in;
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char xfertype;
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int length; /* Depends on type: xfer length or act length */
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int status;
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int interval;
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int start_frame;
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int error_count;
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char setup_flag;
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char data_flag;
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int numdesc; /* Full number */
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struct mon_iso_desc isodesc[ISODESC_MAX];
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unsigned char setup[SETUP_MAX];
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unsigned char data[DATA_MAX];
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};
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#define SLAB_NAME_SZ 30
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struct mon_reader_text {
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struct kmem_cache *e_slab;
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int nevents;
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struct list_head e_list;
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struct mon_reader r; /* In C, parent class can be placed anywhere */
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wait_queue_head_t wait;
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int printf_size;
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size_t printf_offset;
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size_t printf_togo;
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char *printf_buf;
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struct mutex printf_lock;
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char slab_name[SLAB_NAME_SZ];
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};
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static struct dentry *mon_dir; /* Usually /sys/kernel/debug/usbmon */
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static void mon_text_ctor(void *);
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struct mon_text_ptr {
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int cnt, limit;
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char *pbuf;
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};
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static struct mon_event_text *
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mon_text_read_wait(struct mon_reader_text *rp, struct file *file);
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static void mon_text_read_head_t(struct mon_reader_text *rp,
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struct mon_text_ptr *p, const struct mon_event_text *ep);
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static void mon_text_read_head_u(struct mon_reader_text *rp,
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struct mon_text_ptr *p, const struct mon_event_text *ep);
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static void mon_text_read_statset(struct mon_reader_text *rp,
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struct mon_text_ptr *p, const struct mon_event_text *ep);
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static void mon_text_read_intstat(struct mon_reader_text *rp,
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struct mon_text_ptr *p, const struct mon_event_text *ep);
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static void mon_text_read_isostat(struct mon_reader_text *rp,
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struct mon_text_ptr *p, const struct mon_event_text *ep);
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static void mon_text_read_isodesc(struct mon_reader_text *rp,
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struct mon_text_ptr *p, const struct mon_event_text *ep);
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static void mon_text_read_data(struct mon_reader_text *rp,
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struct mon_text_ptr *p, const struct mon_event_text *ep);
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/*
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* mon_text_submit
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* mon_text_complete
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*
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* May be called from an interrupt.
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*
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* This is called with the whole mon_bus locked, so no additional lock.
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*/
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static inline char mon_text_get_setup(struct mon_event_text *ep,
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struct urb *urb, char ev_type, struct mon_bus *mbus)
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{
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if (ep->xfertype != USB_ENDPOINT_XFER_CONTROL || ev_type != 'S')
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return '-';
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if (urb->setup_packet == NULL)
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return 'Z'; /* '0' would be not as pretty. */
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memcpy(ep->setup, urb->setup_packet, SETUP_MAX);
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return 0;
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}
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static inline char mon_text_get_data(struct mon_event_text *ep, struct urb *urb,
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int len, char ev_type, struct mon_bus *mbus)
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{
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void *src;
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if (len <= 0)
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return 'L';
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if (len >= DATA_MAX)
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len = DATA_MAX;
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if (ep->is_in) {
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if (ev_type != 'C')
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return '<';
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} else {
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if (ev_type != 'S')
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return '>';
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}
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if (urb->num_sgs == 0) {
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src = urb->transfer_buffer;
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if (src == NULL)
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return 'Z'; /* '0' would be not as pretty. */
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} else {
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struct scatterlist *sg = urb->sg;
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if (PageHighMem(sg_page(sg)))
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return 'D';
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/* For the text interface we copy only the first sg buffer */
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len = min_t(int, sg->length, len);
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src = sg_virt(sg);
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}
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memcpy(ep->data, src, len);
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return 0;
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}
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static inline unsigned int mon_get_timestamp(void)
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{
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struct timespec64 now;
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unsigned int stamp;
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ktime_get_ts64(&now);
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stamp = now.tv_sec & 0xFFF; /* 2^32 = 4294967296. Limit to 4096s. */
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stamp = stamp * USEC_PER_SEC + now.tv_nsec / NSEC_PER_USEC;
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return stamp;
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}
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static void mon_text_event(struct mon_reader_text *rp, struct urb *urb,
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char ev_type, int status)
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{
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struct mon_event_text *ep;
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unsigned int stamp;
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struct usb_iso_packet_descriptor *fp;
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struct mon_iso_desc *dp;
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int i, ndesc;
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stamp = mon_get_timestamp();
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if (rp->nevents >= EVENT_MAX ||
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(ep = kmem_cache_alloc(rp->e_slab, GFP_ATOMIC)) == NULL) {
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rp->r.m_bus->cnt_text_lost++;
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return;
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}
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ep->type = ev_type;
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ep->id = (unsigned long) urb;
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ep->busnum = urb->dev->bus->busnum;
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ep->devnum = urb->dev->devnum;
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ep->epnum = usb_endpoint_num(&urb->ep->desc);
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ep->xfertype = usb_endpoint_type(&urb->ep->desc);
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ep->is_in = usb_urb_dir_in(urb);
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ep->tstamp = stamp;
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ep->length = (ev_type == 'S') ?
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urb->transfer_buffer_length : urb->actual_length;
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/* Collecting status makes debugging sense for submits, too */
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ep->status = status;
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if (ep->xfertype == USB_ENDPOINT_XFER_INT) {
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ep->interval = urb->interval;
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} else if (ep->xfertype == USB_ENDPOINT_XFER_ISOC) {
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ep->interval = urb->interval;
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ep->start_frame = urb->start_frame;
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ep->error_count = urb->error_count;
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}
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ep->numdesc = urb->number_of_packets;
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if (ep->xfertype == USB_ENDPOINT_XFER_ISOC &&
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urb->number_of_packets > 0) {
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if ((ndesc = urb->number_of_packets) > ISODESC_MAX)
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ndesc = ISODESC_MAX;
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fp = urb->iso_frame_desc;
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dp = ep->isodesc;
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for (i = 0; i < ndesc; i++) {
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dp->status = fp->status;
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dp->offset = fp->offset;
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dp->length = (ev_type == 'S') ?
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fp->length : fp->actual_length;
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fp++;
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dp++;
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}
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/* Wasteful, but simple to understand: ISO 'C' is sparse. */
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if (ev_type == 'C')
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ep->length = urb->transfer_buffer_length;
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}
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ep->setup_flag = mon_text_get_setup(ep, urb, ev_type, rp->r.m_bus);
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ep->data_flag = mon_text_get_data(ep, urb, ep->length, ev_type,
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rp->r.m_bus);
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rp->nevents++;
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list_add_tail(&ep->e_link, &rp->e_list);
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wake_up(&rp->wait);
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}
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static void mon_text_submit(void *data, struct urb *urb)
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{
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struct mon_reader_text *rp = data;
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mon_text_event(rp, urb, 'S', -EINPROGRESS);
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}
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static void mon_text_complete(void *data, struct urb *urb, int status)
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{
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struct mon_reader_text *rp = data;
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mon_text_event(rp, urb, 'C', status);
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}
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static void mon_text_error(void *data, struct urb *urb, int error)
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{
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struct mon_reader_text *rp = data;
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struct mon_event_text *ep;
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if (rp->nevents >= EVENT_MAX ||
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(ep = kmem_cache_alloc(rp->e_slab, GFP_ATOMIC)) == NULL) {
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rp->r.m_bus->cnt_text_lost++;
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return;
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}
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ep->type = 'E';
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ep->id = (unsigned long) urb;
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ep->busnum = urb->dev->bus->busnum;
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ep->devnum = urb->dev->devnum;
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ep->epnum = usb_endpoint_num(&urb->ep->desc);
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ep->xfertype = usb_endpoint_type(&urb->ep->desc);
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ep->is_in = usb_urb_dir_in(urb);
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ep->tstamp = mon_get_timestamp();
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ep->length = 0;
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ep->status = error;
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ep->setup_flag = '-';
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ep->data_flag = 'E';
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rp->nevents++;
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list_add_tail(&ep->e_link, &rp->e_list);
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wake_up(&rp->wait);
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}
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/*
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* Fetch next event from the circular buffer.
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*/
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static struct mon_event_text *mon_text_fetch(struct mon_reader_text *rp,
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struct mon_bus *mbus)
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{
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struct list_head *p;
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unsigned long flags;
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spin_lock_irqsave(&mbus->lock, flags);
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if (list_empty(&rp->e_list)) {
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spin_unlock_irqrestore(&mbus->lock, flags);
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return NULL;
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}
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p = rp->e_list.next;
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list_del(p);
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--rp->nevents;
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spin_unlock_irqrestore(&mbus->lock, flags);
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return list_entry(p, struct mon_event_text, e_link);
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}
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/*
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*/
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static int mon_text_open(struct inode *inode, struct file *file)
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{
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struct mon_bus *mbus;
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struct mon_reader_text *rp;
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int rc;
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mutex_lock(&mon_lock);
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mbus = inode->i_private;
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rp = kzalloc(sizeof(struct mon_reader_text), GFP_KERNEL);
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if (rp == NULL) {
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rc = -ENOMEM;
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goto err_alloc;
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}
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INIT_LIST_HEAD(&rp->e_list);
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init_waitqueue_head(&rp->wait);
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mutex_init(&rp->printf_lock);
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rp->printf_size = PRINTF_DFL;
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rp->printf_buf = kmalloc(rp->printf_size, GFP_KERNEL);
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if (rp->printf_buf == NULL) {
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rc = -ENOMEM;
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goto err_alloc_pr;
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}
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rp->r.m_bus = mbus;
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rp->r.r_data = rp;
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rp->r.rnf_submit = mon_text_submit;
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rp->r.rnf_error = mon_text_error;
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rp->r.rnf_complete = mon_text_complete;
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snprintf(rp->slab_name, SLAB_NAME_SZ, "mon_text_%p", rp);
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rp->e_slab = kmem_cache_create(rp->slab_name,
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sizeof(struct mon_event_text), sizeof(long), 0,
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mon_text_ctor);
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if (rp->e_slab == NULL) {
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rc = -ENOMEM;
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goto err_slab;
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}
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mon_reader_add(mbus, &rp->r);
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file->private_data = rp;
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mutex_unlock(&mon_lock);
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return 0;
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// err_busy:
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// kmem_cache_destroy(rp->e_slab);
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err_slab:
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kfree(rp->printf_buf);
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err_alloc_pr:
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kfree(rp);
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err_alloc:
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mutex_unlock(&mon_lock);
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return rc;
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}
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static ssize_t mon_text_copy_to_user(struct mon_reader_text *rp,
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char __user * const buf, const size_t nbytes)
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{
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const size_t togo = min(nbytes, rp->printf_togo);
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if (copy_to_user(buf, &rp->printf_buf[rp->printf_offset], togo))
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return -EFAULT;
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rp->printf_togo -= togo;
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rp->printf_offset += togo;
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return togo;
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}
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/* ppos is not advanced since the llseek operation is not permitted. */
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static ssize_t mon_text_read_t(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct mon_reader_text *rp = file->private_data;
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struct mon_event_text *ep;
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struct mon_text_ptr ptr;
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ssize_t ret;
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mutex_lock(&rp->printf_lock);
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if (rp->printf_togo == 0) {
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ep = mon_text_read_wait(rp, file);
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if (IS_ERR(ep)) {
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mutex_unlock(&rp->printf_lock);
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return PTR_ERR(ep);
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}
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ptr.cnt = 0;
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ptr.pbuf = rp->printf_buf;
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ptr.limit = rp->printf_size;
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mon_text_read_head_t(rp, &ptr, ep);
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mon_text_read_statset(rp, &ptr, ep);
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ptr.cnt += snprintf(ptr.pbuf + ptr.cnt, ptr.limit - ptr.cnt,
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" %d", ep->length);
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mon_text_read_data(rp, &ptr, ep);
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rp->printf_togo = ptr.cnt;
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rp->printf_offset = 0;
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kmem_cache_free(rp->e_slab, ep);
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}
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ret = mon_text_copy_to_user(rp, buf, nbytes);
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mutex_unlock(&rp->printf_lock);
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return ret;
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}
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/* ppos is not advanced since the llseek operation is not permitted. */
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static ssize_t mon_text_read_u(struct file *file, char __user *buf,
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size_t nbytes, loff_t *ppos)
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{
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struct mon_reader_text *rp = file->private_data;
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struct mon_event_text *ep;
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struct mon_text_ptr ptr;
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ssize_t ret;
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mutex_lock(&rp->printf_lock);
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if (rp->printf_togo == 0) {
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ep = mon_text_read_wait(rp, file);
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if (IS_ERR(ep)) {
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mutex_unlock(&rp->printf_lock);
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return PTR_ERR(ep);
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}
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ptr.cnt = 0;
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ptr.pbuf = rp->printf_buf;
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ptr.limit = rp->printf_size;
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mon_text_read_head_u(rp, &ptr, ep);
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if (ep->type == 'E') {
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mon_text_read_statset(rp, &ptr, ep);
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} else if (ep->xfertype == USB_ENDPOINT_XFER_ISOC) {
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mon_text_read_isostat(rp, &ptr, ep);
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mon_text_read_isodesc(rp, &ptr, ep);
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} else if (ep->xfertype == USB_ENDPOINT_XFER_INT) {
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mon_text_read_intstat(rp, &ptr, ep);
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} else {
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mon_text_read_statset(rp, &ptr, ep);
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}
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ptr.cnt += snprintf(ptr.pbuf + ptr.cnt, ptr.limit - ptr.cnt,
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" %d", ep->length);
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mon_text_read_data(rp, &ptr, ep);
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rp->printf_togo = ptr.cnt;
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rp->printf_offset = 0;
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kmem_cache_free(rp->e_slab, ep);
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}
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ret = mon_text_copy_to_user(rp, buf, nbytes);
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mutex_unlock(&rp->printf_lock);
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return ret;
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}
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static struct mon_event_text *mon_text_read_wait(struct mon_reader_text *rp,
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struct file *file)
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{
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struct mon_bus *mbus = rp->r.m_bus;
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DECLARE_WAITQUEUE(waita, current);
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struct mon_event_text *ep;
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add_wait_queue(&rp->wait, &waita);
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set_current_state(TASK_INTERRUPTIBLE);
|
|
while ((ep = mon_text_fetch(rp, mbus)) == NULL) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&rp->wait, &waita);
|
|
return ERR_PTR(-EWOULDBLOCK);
|
|
}
|
|
/*
|
|
* We do not count nwaiters, because ->release is supposed
|
|
* to be called when all openers are gone only.
|
|
*/
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
remove_wait_queue(&rp->wait, &waita);
|
|
return ERR_PTR(-EINTR);
|
|
}
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&rp->wait, &waita);
|
|
return ep;
|
|
}
|
|
|
|
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 = (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:%03u:%02u",
|
|
ep->id, ep->tstamp, ep->type,
|
|
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 */
|
|
p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt,
|
|
" s %02x %02x %04x %04x %04x",
|
|
ep->setup[0],
|
|
ep->setup[1],
|
|
(ep->setup[3] << 8) | ep->setup[2],
|
|
(ep->setup[5] << 8) | ep->setup[4],
|
|
(ep->setup[7] << 8) | ep->setup[6]);
|
|
} else if (ep->setup_flag != '-') { /* Unable to capture setup packet */
|
|
p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt,
|
|
" %c __ __ ____ ____ ____", ep->setup_flag);
|
|
} else { /* No setup for this kind of URB */
|
|
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);
|
|
}
|
|
}
|
|
|
|
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) {
|
|
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) {
|
|
p->cnt += snprintf(p->pbuf + p->cnt,
|
|
p->limit - p->cnt,
|
|
" ");
|
|
}
|
|
p->cnt += snprintf(p->pbuf + p->cnt,
|
|
p->limit - p->cnt,
|
|
"%02x", ep->data[i]);
|
|
}
|
|
p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt,
|
|
"\n");
|
|
} else {
|
|
p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt,
|
|
" %c\n", ep->data_flag);
|
|
}
|
|
} else {
|
|
p->cnt += snprintf(p->pbuf + p->cnt, p->limit - p->cnt, "\n");
|
|
}
|
|
}
|
|
|
|
static int mon_text_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct mon_reader_text *rp = file->private_data;
|
|
struct mon_bus *mbus;
|
|
/* unsigned long flags; */
|
|
struct list_head *p;
|
|
struct mon_event_text *ep;
|
|
|
|
mutex_lock(&mon_lock);
|
|
mbus = inode->i_private;
|
|
|
|
if (mbus->nreaders <= 0) {
|
|
printk(KERN_ERR TAG ": consistency error on close\n");
|
|
mutex_unlock(&mon_lock);
|
|
return 0;
|
|
}
|
|
mon_reader_del(mbus, &rp->r);
|
|
|
|
/*
|
|
* In theory, e_list is protected by mbus->lock. However,
|
|
* after mon_reader_del has finished, the following is the case:
|
|
* - we are not on reader list anymore, so new events won't be added;
|
|
* - whole mbus may be dropped if it was orphaned.
|
|
* So, we better not touch mbus.
|
|
*/
|
|
/* spin_lock_irqsave(&mbus->lock, flags); */
|
|
while (!list_empty(&rp->e_list)) {
|
|
p = rp->e_list.next;
|
|
ep = list_entry(p, struct mon_event_text, e_link);
|
|
list_del(p);
|
|
--rp->nevents;
|
|
kmem_cache_free(rp->e_slab, ep);
|
|
}
|
|
/* spin_unlock_irqrestore(&mbus->lock, flags); */
|
|
|
|
kmem_cache_destroy(rp->e_slab);
|
|
kfree(rp->printf_buf);
|
|
kfree(rp);
|
|
|
|
mutex_unlock(&mon_lock);
|
|
return 0;
|
|
}
|
|
|
|
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_u,
|
|
.release = mon_text_release,
|
|
};
|
|
|
|
int mon_text_add(struct mon_bus *mbus, const struct usb_bus *ubus)
|
|
{
|
|
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;
|
|
mbus->dent_t = debugfs_create_file(name, 0600, mon_dir, mbus,
|
|
&mon_fops_text_t);
|
|
}
|
|
|
|
rc = snprintf(name, NAMESZ, "%du", busnum);
|
|
if (rc <= 0 || rc >= NAMESZ)
|
|
goto err_print_u;
|
|
mbus->dent_u = debugfs_create_file(name, 0600, mon_dir, mbus,
|
|
&mon_fops_text_u);
|
|
|
|
rc = snprintf(name, NAMESZ, "%ds", busnum);
|
|
if (rc <= 0 || rc >= NAMESZ)
|
|
goto err_print_s;
|
|
mbus->dent_s = debugfs_create_file(name, 0600, mon_dir, mbus,
|
|
&mon_fops_stat);
|
|
|
|
return 1;
|
|
|
|
err_print_s:
|
|
debugfs_remove(mbus->dent_u);
|
|
mbus->dent_u = NULL;
|
|
err_print_u:
|
|
if (ubus != NULL) {
|
|
debugfs_remove(mbus->dent_t);
|
|
mbus->dent_t = NULL;
|
|
}
|
|
err_print_t:
|
|
return 0;
|
|
}
|
|
|
|
void mon_text_del(struct mon_bus *mbus)
|
|
{
|
|
debugfs_remove(mbus->dent_u);
|
|
debugfs_remove(mbus->dent_t);
|
|
debugfs_remove(mbus->dent_s);
|
|
}
|
|
|
|
/*
|
|
* Slab interface: constructor.
|
|
*/
|
|
static void mon_text_ctor(void *mem)
|
|
{
|
|
/*
|
|
* Nothing to initialize. No, really!
|
|
* So, we fill it with garbage to emulate a reused object.
|
|
*/
|
|
memset(mem, 0xe5, sizeof(struct mon_event_text));
|
|
}
|
|
|
|
int __init mon_text_init(void)
|
|
{
|
|
mon_dir = debugfs_create_dir("usbmon", usb_debug_root);
|
|
return 0;
|
|
}
|
|
|
|
void mon_text_exit(void)
|
|
{
|
|
debugfs_remove(mon_dir);
|
|
}
|