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773 lines
19 KiB
773 lines
19 KiB
// 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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|
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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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/* |
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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 += scnprintf(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 += scnprintf(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); |
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while ((ep = mon_text_fetch(rp, mbus)) == NULL) { |
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if (file->f_flags & O_NONBLOCK) { |
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set_current_state(TASK_RUNNING); |
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remove_wait_queue(&rp->wait, &waita); |
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return ERR_PTR(-EWOULDBLOCK); |
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} |
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/* |
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* We do not count nwaiters, because ->release is supposed |
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* to be called when all openers are gone only. |
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*/ |
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schedule(); |
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if (signal_pending(current)) { |
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remove_wait_queue(&rp->wait, &waita); |
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return ERR_PTR(-EINTR); |
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} |
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set_current_state(TASK_INTERRUPTIBLE); |
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} |
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set_current_state(TASK_RUNNING); |
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remove_wait_queue(&rp->wait, &waita); |
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return ep; |
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} |
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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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{ |
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char udir, utype; |
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udir = (ep->is_in ? 'i' : 'o'); |
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switch (ep->xfertype) { |
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case USB_ENDPOINT_XFER_ISOC: utype = 'Z'; break; |
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case USB_ENDPOINT_XFER_INT: utype = 'I'; break; |
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case USB_ENDPOINT_XFER_CONTROL: utype = 'C'; break; |
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default: /* PIPE_BULK */ utype = 'B'; |
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} |
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p->cnt += scnprintf(p->pbuf + p->cnt, p->limit - p->cnt, |
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"%lx %u %c %c%c:%03u:%02u", |
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ep->id, ep->tstamp, ep->type, |
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utype, udir, ep->devnum, ep->epnum); |
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} |
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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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{ |
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char udir, utype; |
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udir = (ep->is_in ? 'i' : 'o'); |
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switch (ep->xfertype) { |
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case USB_ENDPOINT_XFER_ISOC: utype = 'Z'; break; |
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case USB_ENDPOINT_XFER_INT: utype = 'I'; break; |
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case USB_ENDPOINT_XFER_CONTROL: utype = 'C'; break; |
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default: /* PIPE_BULK */ utype = 'B'; |
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} |
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p->cnt += scnprintf(p->pbuf + p->cnt, p->limit - p->cnt, |
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"%lx %u %c %c%c:%d:%03u:%u", |
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ep->id, ep->tstamp, ep->type, |
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utype, udir, ep->busnum, ep->devnum, ep->epnum); |
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} |
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|
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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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{ |
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|
|
if (ep->setup_flag == 0) { /* Setup packet is present and captured */ |
|
p->cnt += scnprintf(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 += scnprintf(p->pbuf + p->cnt, p->limit - p->cnt, |
|
" %c __ __ ____ ____ ____", ep->setup_flag); |
|
} else { /* No setup for this kind of URB */ |
|
p->cnt += scnprintf(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 += scnprintf(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 += scnprintf(p->pbuf + p->cnt, p->limit - p->cnt, |
|
" %d:%d:%d", ep->status, ep->interval, ep->start_frame); |
|
} else { |
|
p->cnt += scnprintf(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 += scnprintf(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 += scnprintf(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 += scnprintf(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 += scnprintf(p->pbuf + p->cnt, |
|
p->limit - p->cnt, |
|
" "); |
|
} |
|
p->cnt += scnprintf(p->pbuf + p->cnt, |
|
p->limit - p->cnt, |
|
"%02x", ep->data[i]); |
|
} |
|
p->cnt += scnprintf(p->pbuf + p->cnt, p->limit - p->cnt, |
|
"\n"); |
|
} else { |
|
p->cnt += scnprintf(p->pbuf + p->cnt, p->limit - p->cnt, |
|
" %c\n", ep->data_flag); |
|
} |
|
} else { |
|
p->cnt += scnprintf(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); |
|
}
|
|
|