1af46fd72d
Add explicit lock_kernel() calls to mon_bin_open() Signed-off-by: Jonathan Corbet <corbet@lwn.net>
1216 lines
28 KiB
C
1216 lines
28 KiB
C
/*
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* The USB Monitor, inspired by Dave Harding's USBMon.
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*
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* This is a binary format reader.
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*
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* Copyright (C) 2006 Paolo Abeni (paolo.abeni@email.it)
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* Copyright (C) 2006,2007 Pete Zaitcev (zaitcev@redhat.com)
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/cdev.h>
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#include <linux/usb.h>
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#include <linux/poll.h>
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#include <linux/compat.h>
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#include <linux/mm.h>
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#include <linux/smp_lock.h>
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#include <asm/uaccess.h>
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#include "usb_mon.h"
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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_LEN 8
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/* ioctl macros */
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#define MON_IOC_MAGIC 0x92
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#define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1)
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/* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */
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#define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats)
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#define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4)
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#define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5)
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#define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get)
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#define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch)
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#define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8)
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#ifdef CONFIG_COMPAT
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#define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32)
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#define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32)
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#endif
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/*
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* Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc).
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* But it's all right. Just use a simple way to make sure the chunk is never
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* smaller than a page.
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*
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* N.B. An application does not know our chunk size.
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*
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* Woops, get_zeroed_page() returns a single page. I guess we're stuck with
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* page-sized chunks for the time being.
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*/
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#define CHUNK_SIZE PAGE_SIZE
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#define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1))
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/*
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* The magic limit was calculated so that it allows the monitoring
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* application to pick data once in two ticks. This way, another application,
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* which presumably drives the bus, gets to hog CPU, yet we collect our data.
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* If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an
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* enormous overhead built into the bus protocol, so we need about 1000 KB.
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*
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* This is still too much for most cases, where we just snoop a few
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* descriptor fetches for enumeration. So, the default is a "reasonable"
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* amount for systems with HZ=250 and incomplete bus saturation.
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*
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* XXX What about multi-megabyte URBs which take minutes to transfer?
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*/
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#define BUFF_MAX CHUNK_ALIGN(1200*1024)
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#define BUFF_DFL CHUNK_ALIGN(300*1024)
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#define BUFF_MIN CHUNK_ALIGN(8*1024)
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/*
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* The per-event API header (2 per URB).
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*
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* This structure is seen in userland as defined by the documentation.
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*/
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struct mon_bin_hdr {
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u64 id; /* URB ID - from submission to callback */
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unsigned char type; /* Same as in text API; extensible. */
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unsigned char xfer_type; /* ISO, Intr, Control, Bulk */
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unsigned char epnum; /* Endpoint number and transfer direction */
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unsigned char devnum; /* Device address */
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unsigned short busnum; /* Bus number */
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char flag_setup;
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char flag_data;
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s64 ts_sec; /* gettimeofday */
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s32 ts_usec; /* gettimeofday */
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int status;
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unsigned int len_urb; /* Length of data (submitted or actual) */
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unsigned int len_cap; /* Delivered length */
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unsigned char setup[SETUP_LEN]; /* Only for Control S-type */
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};
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/* per file statistic */
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struct mon_bin_stats {
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u32 queued;
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u32 dropped;
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};
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struct mon_bin_get {
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struct mon_bin_hdr __user *hdr; /* Only 48 bytes, not 64. */
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void __user *data;
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size_t alloc; /* Length of data (can be zero) */
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};
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struct mon_bin_mfetch {
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u32 __user *offvec; /* Vector of events fetched */
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u32 nfetch; /* Number of events to fetch (out: fetched) */
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u32 nflush; /* Number of events to flush */
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};
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#ifdef CONFIG_COMPAT
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struct mon_bin_get32 {
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u32 hdr32;
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u32 data32;
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u32 alloc32;
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};
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struct mon_bin_mfetch32 {
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u32 offvec32;
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u32 nfetch32;
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u32 nflush32;
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};
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#endif
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/* Having these two values same prevents wrapping of the mon_bin_hdr */
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#define PKT_ALIGN 64
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#define PKT_SIZE 64
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/* max number of USB bus supported */
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#define MON_BIN_MAX_MINOR 128
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/*
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* The buffer: map of used pages.
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*/
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struct mon_pgmap {
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struct page *pg;
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unsigned char *ptr; /* XXX just use page_to_virt everywhere? */
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};
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/*
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* This gets associated with an open file struct.
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*/
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struct mon_reader_bin {
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/* The buffer: one per open. */
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spinlock_t b_lock; /* Protect b_cnt, b_in */
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unsigned int b_size; /* Current size of the buffer - bytes */
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unsigned int b_cnt; /* Bytes used */
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unsigned int b_in, b_out; /* Offsets into buffer - bytes */
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unsigned int b_read; /* Amount of read data in curr. pkt. */
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struct mon_pgmap *b_vec; /* The map array */
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wait_queue_head_t b_wait; /* Wait for data here */
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struct mutex fetch_lock; /* Protect b_read, b_out */
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int mmap_active;
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/* A list of these is needed for "bus 0". Some time later. */
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struct mon_reader r;
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/* Stats */
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unsigned int cnt_lost;
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};
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static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp,
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unsigned int offset)
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{
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return (struct mon_bin_hdr *)
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(rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE);
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}
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#define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0)
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static unsigned char xfer_to_pipe[4] = {
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PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT
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};
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static struct class *mon_bin_class;
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static dev_t mon_bin_dev0;
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static struct cdev mon_bin_cdev;
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static void mon_buff_area_fill(const struct mon_reader_bin *rp,
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unsigned int offset, unsigned int size);
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static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp);
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static int mon_alloc_buff(struct mon_pgmap *map, int npages);
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static void mon_free_buff(struct mon_pgmap *map, int npages);
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/*
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* This is a "chunked memcpy". It does not manipulate any counters.
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* But it returns the new offset for repeated application.
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*/
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unsigned int mon_copy_to_buff(const struct mon_reader_bin *this,
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unsigned int off, const unsigned char *from, unsigned int length)
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{
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unsigned int step_len;
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unsigned char *buf;
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unsigned int in_page;
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while (length) {
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/*
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* Determine step_len.
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*/
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step_len = length;
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in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1));
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if (in_page < step_len)
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step_len = in_page;
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/*
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* Copy data and advance pointers.
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*/
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buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE;
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memcpy(buf, from, step_len);
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if ((off += step_len) >= this->b_size) off = 0;
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from += step_len;
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length -= step_len;
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}
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return off;
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}
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/*
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* This is a little worse than the above because it's "chunked copy_to_user".
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* The return value is an error code, not an offset.
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*/
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static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off,
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char __user *to, int length)
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{
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unsigned int step_len;
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unsigned char *buf;
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unsigned int in_page;
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while (length) {
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/*
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* Determine step_len.
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*/
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step_len = length;
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in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1));
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if (in_page < step_len)
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step_len = in_page;
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/*
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* Copy data and advance pointers.
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*/
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buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE;
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if (copy_to_user(to, buf, step_len))
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return -EINVAL;
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if ((off += step_len) >= this->b_size) off = 0;
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to += step_len;
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length -= step_len;
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}
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return 0;
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}
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/*
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* Allocate an (aligned) area in the buffer.
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* This is called under b_lock.
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* Returns ~0 on failure.
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*/
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static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp,
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unsigned int size)
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{
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unsigned int offset;
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size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
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if (rp->b_cnt + size > rp->b_size)
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return ~0;
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offset = rp->b_in;
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rp->b_cnt += size;
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if ((rp->b_in += size) >= rp->b_size)
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rp->b_in -= rp->b_size;
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return offset;
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}
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/*
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* This is the same thing as mon_buff_area_alloc, only it does not allow
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* buffers to wrap. This is needed by applications which pass references
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* into mmap-ed buffers up their stacks (libpcap can do that).
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*
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* Currently, we always have the header stuck with the data, although
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* it is not strictly speaking necessary.
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*
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* When a buffer would wrap, we place a filler packet to mark the space.
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*/
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static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp,
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unsigned int size)
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{
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unsigned int offset;
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unsigned int fill_size;
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size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
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if (rp->b_cnt + size > rp->b_size)
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return ~0;
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if (rp->b_in + size > rp->b_size) {
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/*
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* This would wrap. Find if we still have space after
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* skipping to the end of the buffer. If we do, place
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* a filler packet and allocate a new packet.
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*/
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fill_size = rp->b_size - rp->b_in;
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if (rp->b_cnt + size + fill_size > rp->b_size)
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return ~0;
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mon_buff_area_fill(rp, rp->b_in, fill_size);
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offset = 0;
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rp->b_in = size;
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rp->b_cnt += size + fill_size;
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} else if (rp->b_in + size == rp->b_size) {
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offset = rp->b_in;
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rp->b_in = 0;
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rp->b_cnt += size;
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} else {
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offset = rp->b_in;
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rp->b_in += size;
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rp->b_cnt += size;
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}
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return offset;
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}
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/*
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* Return a few (kilo-)bytes to the head of the buffer.
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* This is used if a DMA fetch fails.
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*/
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static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size)
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{
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size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
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rp->b_cnt -= size;
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if (rp->b_in < size)
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rp->b_in += rp->b_size;
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rp->b_in -= size;
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}
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/*
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* This has to be called under both b_lock and fetch_lock, because
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* it accesses both b_cnt and b_out.
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*/
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static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size)
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{
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size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
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rp->b_cnt -= size;
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if ((rp->b_out += size) >= rp->b_size)
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rp->b_out -= rp->b_size;
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}
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static void mon_buff_area_fill(const struct mon_reader_bin *rp,
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unsigned int offset, unsigned int size)
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{
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struct mon_bin_hdr *ep;
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ep = MON_OFF2HDR(rp, offset);
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memset(ep, 0, PKT_SIZE);
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ep->type = '@';
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ep->len_cap = size - PKT_SIZE;
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}
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static inline char mon_bin_get_setup(unsigned char *setupb,
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const struct urb *urb, char ev_type)
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{
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if (!usb_endpoint_xfer_control(&urb->ep->desc) || ev_type != 'S')
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return '-';
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if (urb->setup_packet == NULL)
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return 'Z';
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memcpy(setupb, urb->setup_packet, SETUP_LEN);
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return 0;
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}
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static char mon_bin_get_data(const struct mon_reader_bin *rp,
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unsigned int offset, struct urb *urb, unsigned int length)
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{
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if (urb->dev->bus->uses_dma &&
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(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
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mon_dmapeek_vec(rp, offset, urb->transfer_dma, length);
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return 0;
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}
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if (urb->transfer_buffer == NULL)
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return 'Z';
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mon_copy_to_buff(rp, offset, urb->transfer_buffer, length);
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return 0;
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}
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static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
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char ev_type, int status)
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{
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const struct usb_endpoint_descriptor *epd = &urb->ep->desc;
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unsigned long flags;
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struct timeval ts;
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unsigned int urb_length;
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unsigned int offset;
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unsigned int length;
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unsigned char dir;
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struct mon_bin_hdr *ep;
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char data_tag = 0;
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do_gettimeofday(&ts);
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spin_lock_irqsave(&rp->b_lock, flags);
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/*
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* Find the maximum allowable length, then allocate space.
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*/
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urb_length = (ev_type == 'S') ?
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urb->transfer_buffer_length : urb->actual_length;
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length = urb_length;
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if (length >= rp->b_size/5)
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length = rp->b_size/5;
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if (usb_urb_dir_in(urb)) {
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if (ev_type == 'S') {
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length = 0;
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data_tag = '<';
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}
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/* Cannot rely on endpoint number in case of control ep.0 */
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dir = USB_DIR_IN;
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} else {
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if (ev_type == 'C') {
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length = 0;
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data_tag = '>';
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}
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dir = 0;
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}
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if (rp->mmap_active)
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offset = mon_buff_area_alloc_contiguous(rp, length + PKT_SIZE);
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else
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offset = mon_buff_area_alloc(rp, length + PKT_SIZE);
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if (offset == ~0) {
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rp->cnt_lost++;
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spin_unlock_irqrestore(&rp->b_lock, flags);
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return;
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}
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ep = MON_OFF2HDR(rp, offset);
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if ((offset += PKT_SIZE) >= rp->b_size) offset = 0;
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/*
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* Fill the allocated area.
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*/
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memset(ep, 0, PKT_SIZE);
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ep->type = ev_type;
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ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)];
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ep->epnum = dir | usb_endpoint_num(epd);
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ep->devnum = urb->dev->devnum;
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ep->busnum = urb->dev->bus->busnum;
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ep->id = (unsigned long) urb;
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ep->ts_sec = ts.tv_sec;
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ep->ts_usec = ts.tv_usec;
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ep->status = status;
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ep->len_urb = urb_length;
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ep->len_cap = length;
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ep->flag_setup = mon_bin_get_setup(ep->setup, urb, ev_type);
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if (length != 0) {
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ep->flag_data = mon_bin_get_data(rp, offset, urb, length);
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if (ep->flag_data != 0) { /* Yes, it's 0x00, not '0' */
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ep->len_cap = 0;
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mon_buff_area_shrink(rp, length);
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}
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} else {
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ep->flag_data = data_tag;
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}
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spin_unlock_irqrestore(&rp->b_lock, flags);
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wake_up(&rp->b_wait);
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}
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static void mon_bin_submit(void *data, struct urb *urb)
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{
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struct mon_reader_bin *rp = data;
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mon_bin_event(rp, urb, 'S', -EINPROGRESS);
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}
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static void mon_bin_complete(void *data, struct urb *urb, int status)
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{
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struct mon_reader_bin *rp = data;
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mon_bin_event(rp, urb, 'C', status);
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}
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static void mon_bin_error(void *data, struct urb *urb, int error)
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{
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struct mon_reader_bin *rp = data;
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unsigned long flags;
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unsigned int offset;
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struct mon_bin_hdr *ep;
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spin_lock_irqsave(&rp->b_lock, flags);
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offset = mon_buff_area_alloc(rp, PKT_SIZE);
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if (offset == ~0) {
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/* Not incrementing cnt_lost. Just because. */
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spin_unlock_irqrestore(&rp->b_lock, flags);
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|
return;
|
|
}
|
|
|
|
ep = MON_OFF2HDR(rp, offset);
|
|
|
|
memset(ep, 0, PKT_SIZE);
|
|
ep->type = 'E';
|
|
ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)];
|
|
ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0;
|
|
ep->epnum |= usb_endpoint_num(&urb->ep->desc);
|
|
ep->devnum = urb->dev->devnum;
|
|
ep->busnum = urb->dev->bus->busnum;
|
|
ep->id = (unsigned long) urb;
|
|
ep->status = error;
|
|
|
|
ep->flag_setup = '-';
|
|
ep->flag_data = 'E';
|
|
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
|
|
wake_up(&rp->b_wait);
|
|
}
|
|
|
|
static int mon_bin_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct mon_bus *mbus;
|
|
struct mon_reader_bin *rp;
|
|
size_t size;
|
|
int rc;
|
|
|
|
lock_kernel();
|
|
mutex_lock(&mon_lock);
|
|
if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) {
|
|
mutex_unlock(&mon_lock);
|
|
unlock_kernel();
|
|
return -ENODEV;
|
|
}
|
|
if (mbus != &mon_bus0 && mbus->u_bus == NULL) {
|
|
printk(KERN_ERR TAG ": consistency error on open\n");
|
|
mutex_unlock(&mon_lock);
|
|
unlock_kernel();
|
|
return -ENODEV;
|
|
}
|
|
|
|
rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL);
|
|
if (rp == NULL) {
|
|
rc = -ENOMEM;
|
|
goto err_alloc;
|
|
}
|
|
spin_lock_init(&rp->b_lock);
|
|
init_waitqueue_head(&rp->b_wait);
|
|
mutex_init(&rp->fetch_lock);
|
|
|
|
rp->b_size = BUFF_DFL;
|
|
|
|
size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE);
|
|
if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) {
|
|
rc = -ENOMEM;
|
|
goto err_allocvec;
|
|
}
|
|
|
|
if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0)
|
|
goto err_allocbuff;
|
|
|
|
rp->r.m_bus = mbus;
|
|
rp->r.r_data = rp;
|
|
rp->r.rnf_submit = mon_bin_submit;
|
|
rp->r.rnf_error = mon_bin_error;
|
|
rp->r.rnf_complete = mon_bin_complete;
|
|
|
|
mon_reader_add(mbus, &rp->r);
|
|
|
|
file->private_data = rp;
|
|
mutex_unlock(&mon_lock);
|
|
unlock_kernel();
|
|
return 0;
|
|
|
|
err_allocbuff:
|
|
kfree(rp->b_vec);
|
|
err_allocvec:
|
|
kfree(rp);
|
|
err_alloc:
|
|
mutex_unlock(&mon_lock);
|
|
unlock_kernel();
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Extract an event from buffer and copy it to user space.
|
|
* Wait if there is no event ready.
|
|
* Returns zero or error.
|
|
*/
|
|
static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp,
|
|
struct mon_bin_hdr __user *hdr, void __user *data, unsigned int nbytes)
|
|
{
|
|
unsigned long flags;
|
|
struct mon_bin_hdr *ep;
|
|
size_t step_len;
|
|
unsigned int offset;
|
|
int rc;
|
|
|
|
mutex_lock(&rp->fetch_lock);
|
|
|
|
if ((rc = mon_bin_wait_event(file, rp)) < 0) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return rc;
|
|
}
|
|
|
|
ep = MON_OFF2HDR(rp, rp->b_out);
|
|
|
|
if (copy_to_user(hdr, ep, sizeof(struct mon_bin_hdr))) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return -EFAULT;
|
|
}
|
|
|
|
step_len = min(ep->len_cap, nbytes);
|
|
if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0;
|
|
|
|
if (copy_from_buf(rp, offset, data, step_len)) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return -EFAULT;
|
|
}
|
|
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
mon_buff_area_free(rp, PKT_SIZE + ep->len_cap);
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
rp->b_read = 0;
|
|
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return 0;
|
|
}
|
|
|
|
static int mon_bin_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct mon_reader_bin *rp = file->private_data;
|
|
struct mon_bus* mbus = rp->r.m_bus;
|
|
|
|
mutex_lock(&mon_lock);
|
|
|
|
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);
|
|
|
|
mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE);
|
|
kfree(rp->b_vec);
|
|
kfree(rp);
|
|
|
|
mutex_unlock(&mon_lock);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t mon_bin_read(struct file *file, char __user *buf,
|
|
size_t nbytes, loff_t *ppos)
|
|
{
|
|
struct mon_reader_bin *rp = file->private_data;
|
|
unsigned long flags;
|
|
struct mon_bin_hdr *ep;
|
|
unsigned int offset;
|
|
size_t step_len;
|
|
char *ptr;
|
|
ssize_t done = 0;
|
|
int rc;
|
|
|
|
mutex_lock(&rp->fetch_lock);
|
|
|
|
if ((rc = mon_bin_wait_event(file, rp)) < 0) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return rc;
|
|
}
|
|
|
|
ep = MON_OFF2HDR(rp, rp->b_out);
|
|
|
|
if (rp->b_read < sizeof(struct mon_bin_hdr)) {
|
|
step_len = min(nbytes, sizeof(struct mon_bin_hdr) - rp->b_read);
|
|
ptr = ((char *)ep) + rp->b_read;
|
|
if (step_len && copy_to_user(buf, ptr, step_len)) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return -EFAULT;
|
|
}
|
|
nbytes -= step_len;
|
|
buf += step_len;
|
|
rp->b_read += step_len;
|
|
done += step_len;
|
|
}
|
|
|
|
if (rp->b_read >= sizeof(struct mon_bin_hdr)) {
|
|
step_len = min(nbytes, (size_t)ep->len_cap);
|
|
offset = rp->b_out + PKT_SIZE;
|
|
offset += rp->b_read - sizeof(struct mon_bin_hdr);
|
|
if (offset >= rp->b_size)
|
|
offset -= rp->b_size;
|
|
if (copy_from_buf(rp, offset, buf, step_len)) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return -EFAULT;
|
|
}
|
|
nbytes -= step_len;
|
|
buf += step_len;
|
|
rp->b_read += step_len;
|
|
done += step_len;
|
|
}
|
|
|
|
/*
|
|
* Check if whole packet was read, and if so, jump to the next one.
|
|
*/
|
|
if (rp->b_read >= sizeof(struct mon_bin_hdr) + ep->len_cap) {
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
mon_buff_area_free(rp, PKT_SIZE + ep->len_cap);
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
rp->b_read = 0;
|
|
}
|
|
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return done;
|
|
}
|
|
|
|
/*
|
|
* Remove at most nevents from chunked buffer.
|
|
* Returns the number of removed events.
|
|
*/
|
|
static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents)
|
|
{
|
|
unsigned long flags;
|
|
struct mon_bin_hdr *ep;
|
|
int i;
|
|
|
|
mutex_lock(&rp->fetch_lock);
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
for (i = 0; i < nevents; ++i) {
|
|
if (MON_RING_EMPTY(rp))
|
|
break;
|
|
|
|
ep = MON_OFF2HDR(rp, rp->b_out);
|
|
mon_buff_area_free(rp, PKT_SIZE + ep->len_cap);
|
|
}
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
rp->b_read = 0;
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* Fetch at most max event offsets into the buffer and put them into vec.
|
|
* The events are usually freed later with mon_bin_flush.
|
|
* Return the effective number of events fetched.
|
|
*/
|
|
static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp,
|
|
u32 __user *vec, unsigned int max)
|
|
{
|
|
unsigned int cur_out;
|
|
unsigned int bytes, avail;
|
|
unsigned int size;
|
|
unsigned int nevents;
|
|
struct mon_bin_hdr *ep;
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
mutex_lock(&rp->fetch_lock);
|
|
|
|
if ((rc = mon_bin_wait_event(file, rp)) < 0) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return rc;
|
|
}
|
|
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
avail = rp->b_cnt;
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
|
|
cur_out = rp->b_out;
|
|
nevents = 0;
|
|
bytes = 0;
|
|
while (bytes < avail) {
|
|
if (nevents >= max)
|
|
break;
|
|
|
|
ep = MON_OFF2HDR(rp, cur_out);
|
|
if (put_user(cur_out, &vec[nevents])) {
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return -EFAULT;
|
|
}
|
|
|
|
nevents++;
|
|
size = ep->len_cap + PKT_SIZE;
|
|
size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
|
|
if ((cur_out += size) >= rp->b_size)
|
|
cur_out -= rp->b_size;
|
|
bytes += size;
|
|
}
|
|
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return nevents;
|
|
}
|
|
|
|
/*
|
|
* Count events. This is almost the same as the above mon_bin_fetch,
|
|
* only we do not store offsets into user vector, and we have no limit.
|
|
*/
|
|
static int mon_bin_queued(struct mon_reader_bin *rp)
|
|
{
|
|
unsigned int cur_out;
|
|
unsigned int bytes, avail;
|
|
unsigned int size;
|
|
unsigned int nevents;
|
|
struct mon_bin_hdr *ep;
|
|
unsigned long flags;
|
|
|
|
mutex_lock(&rp->fetch_lock);
|
|
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
avail = rp->b_cnt;
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
|
|
cur_out = rp->b_out;
|
|
nevents = 0;
|
|
bytes = 0;
|
|
while (bytes < avail) {
|
|
ep = MON_OFF2HDR(rp, cur_out);
|
|
|
|
nevents++;
|
|
size = ep->len_cap + PKT_SIZE;
|
|
size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
|
|
if ((cur_out += size) >= rp->b_size)
|
|
cur_out -= rp->b_size;
|
|
bytes += size;
|
|
}
|
|
|
|
mutex_unlock(&rp->fetch_lock);
|
|
return nevents;
|
|
}
|
|
|
|
/*
|
|
*/
|
|
static int mon_bin_ioctl(struct inode *inode, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct mon_reader_bin *rp = file->private_data;
|
|
// struct mon_bus* mbus = rp->r.m_bus;
|
|
int ret = 0;
|
|
struct mon_bin_hdr *ep;
|
|
unsigned long flags;
|
|
|
|
switch (cmd) {
|
|
|
|
case MON_IOCQ_URB_LEN:
|
|
/*
|
|
* N.B. This only returns the size of data, without the header.
|
|
*/
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
if (!MON_RING_EMPTY(rp)) {
|
|
ep = MON_OFF2HDR(rp, rp->b_out);
|
|
ret = ep->len_cap;
|
|
}
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
break;
|
|
|
|
case MON_IOCQ_RING_SIZE:
|
|
ret = rp->b_size;
|
|
break;
|
|
|
|
case MON_IOCT_RING_SIZE:
|
|
/*
|
|
* Changing the buffer size will flush it's contents; the new
|
|
* buffer is allocated before releasing the old one to be sure
|
|
* the device will stay functional also in case of memory
|
|
* pressure.
|
|
*/
|
|
{
|
|
int size;
|
|
struct mon_pgmap *vec;
|
|
|
|
if (arg < BUFF_MIN || arg > BUFF_MAX)
|
|
return -EINVAL;
|
|
|
|
size = CHUNK_ALIGN(arg);
|
|
if ((vec = kzalloc(sizeof(struct mon_pgmap) * (size/CHUNK_SIZE),
|
|
GFP_KERNEL)) == NULL) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
ret = mon_alloc_buff(vec, size/CHUNK_SIZE);
|
|
if (ret < 0) {
|
|
kfree(vec);
|
|
break;
|
|
}
|
|
|
|
mutex_lock(&rp->fetch_lock);
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
mon_free_buff(rp->b_vec, size/CHUNK_SIZE);
|
|
kfree(rp->b_vec);
|
|
rp->b_vec = vec;
|
|
rp->b_size = size;
|
|
rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0;
|
|
rp->cnt_lost = 0;
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
mutex_unlock(&rp->fetch_lock);
|
|
}
|
|
break;
|
|
|
|
case MON_IOCH_MFLUSH:
|
|
ret = mon_bin_flush(rp, arg);
|
|
break;
|
|
|
|
case MON_IOCX_GET:
|
|
{
|
|
struct mon_bin_get getb;
|
|
|
|
if (copy_from_user(&getb, (void __user *)arg,
|
|
sizeof(struct mon_bin_get)))
|
|
return -EFAULT;
|
|
|
|
if (getb.alloc > 0x10000000) /* Want to cast to u32 */
|
|
return -EINVAL;
|
|
ret = mon_bin_get_event(file, rp,
|
|
getb.hdr, getb.data, (unsigned int)getb.alloc);
|
|
}
|
|
break;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
case MON_IOCX_GET32: {
|
|
struct mon_bin_get32 getb;
|
|
|
|
if (copy_from_user(&getb, (void __user *)arg,
|
|
sizeof(struct mon_bin_get32)))
|
|
return -EFAULT;
|
|
|
|
ret = mon_bin_get_event(file, rp,
|
|
compat_ptr(getb.hdr32), compat_ptr(getb.data32),
|
|
getb.alloc32);
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
case MON_IOCX_MFETCH:
|
|
{
|
|
struct mon_bin_mfetch mfetch;
|
|
struct mon_bin_mfetch __user *uptr;
|
|
|
|
uptr = (struct mon_bin_mfetch __user *)arg;
|
|
|
|
if (copy_from_user(&mfetch, uptr, sizeof(mfetch)))
|
|
return -EFAULT;
|
|
|
|
if (mfetch.nflush) {
|
|
ret = mon_bin_flush(rp, mfetch.nflush);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (put_user(ret, &uptr->nflush))
|
|
return -EFAULT;
|
|
}
|
|
ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (put_user(ret, &uptr->nfetch))
|
|
return -EFAULT;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
case MON_IOCX_MFETCH32:
|
|
{
|
|
struct mon_bin_mfetch32 mfetch;
|
|
struct mon_bin_mfetch32 __user *uptr;
|
|
|
|
uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg);
|
|
|
|
if (copy_from_user(&mfetch, uptr, sizeof(mfetch)))
|
|
return -EFAULT;
|
|
|
|
if (mfetch.nflush32) {
|
|
ret = mon_bin_flush(rp, mfetch.nflush32);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (put_user(ret, &uptr->nflush32))
|
|
return -EFAULT;
|
|
}
|
|
ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32),
|
|
mfetch.nfetch32);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (put_user(ret, &uptr->nfetch32))
|
|
return -EFAULT;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
case MON_IOCG_STATS: {
|
|
struct mon_bin_stats __user *sp;
|
|
unsigned int nevents;
|
|
unsigned int ndropped;
|
|
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
ndropped = rp->cnt_lost;
|
|
rp->cnt_lost = 0;
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
nevents = mon_bin_queued(rp);
|
|
|
|
sp = (struct mon_bin_stats __user *)arg;
|
|
if (put_user(rp->cnt_lost, &sp->dropped))
|
|
return -EFAULT;
|
|
if (put_user(nevents, &sp->queued))
|
|
return -EFAULT;
|
|
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int
|
|
mon_bin_poll(struct file *file, struct poll_table_struct *wait)
|
|
{
|
|
struct mon_reader_bin *rp = file->private_data;
|
|
unsigned int mask = 0;
|
|
unsigned long flags;
|
|
|
|
if (file->f_mode & FMODE_READ)
|
|
poll_wait(file, &rp->b_wait, wait);
|
|
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
if (!MON_RING_EMPTY(rp))
|
|
mask |= POLLIN | POLLRDNORM; /* readable */
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* open and close: just keep track of how many times the device is
|
|
* mapped, to use the proper memory allocation function.
|
|
*/
|
|
static void mon_bin_vma_open(struct vm_area_struct *vma)
|
|
{
|
|
struct mon_reader_bin *rp = vma->vm_private_data;
|
|
rp->mmap_active++;
|
|
}
|
|
|
|
static void mon_bin_vma_close(struct vm_area_struct *vma)
|
|
{
|
|
struct mon_reader_bin *rp = vma->vm_private_data;
|
|
rp->mmap_active--;
|
|
}
|
|
|
|
/*
|
|
* Map ring pages to user space.
|
|
*/
|
|
static int mon_bin_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct mon_reader_bin *rp = vma->vm_private_data;
|
|
unsigned long offset, chunk_idx;
|
|
struct page *pageptr;
|
|
|
|
offset = vmf->pgoff << PAGE_SHIFT;
|
|
if (offset >= rp->b_size)
|
|
return VM_FAULT_SIGBUS;
|
|
chunk_idx = offset / CHUNK_SIZE;
|
|
pageptr = rp->b_vec[chunk_idx].pg;
|
|
get_page(pageptr);
|
|
vmf->page = pageptr;
|
|
return 0;
|
|
}
|
|
|
|
static struct vm_operations_struct mon_bin_vm_ops = {
|
|
.open = mon_bin_vma_open,
|
|
.close = mon_bin_vma_close,
|
|
.fault = mon_bin_vma_fault,
|
|
};
|
|
|
|
static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
/* don't do anything here: "fault" will set up page table entries */
|
|
vma->vm_ops = &mon_bin_vm_ops;
|
|
vma->vm_flags |= VM_RESERVED;
|
|
vma->vm_private_data = filp->private_data;
|
|
mon_bin_vma_open(vma);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations mon_fops_binary = {
|
|
.owner = THIS_MODULE,
|
|
.open = mon_bin_open,
|
|
.llseek = no_llseek,
|
|
.read = mon_bin_read,
|
|
/* .write = mon_text_write, */
|
|
.poll = mon_bin_poll,
|
|
.ioctl = mon_bin_ioctl,
|
|
.release = mon_bin_release,
|
|
.mmap = mon_bin_mmap,
|
|
};
|
|
|
|
static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp)
|
|
{
|
|
DECLARE_WAITQUEUE(waita, current);
|
|
unsigned long flags;
|
|
|
|
add_wait_queue(&rp->b_wait, &waita);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
while (MON_RING_EMPTY(rp)) {
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&rp->b_wait, &waita);
|
|
return -EWOULDBLOCK; /* Same as EAGAIN in Linux */
|
|
}
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
remove_wait_queue(&rp->b_wait, &waita);
|
|
return -EINTR;
|
|
}
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
spin_lock_irqsave(&rp->b_lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&rp->b_lock, flags);
|
|
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&rp->b_wait, &waita);
|
|
return 0;
|
|
}
|
|
|
|
static int mon_alloc_buff(struct mon_pgmap *map, int npages)
|
|
{
|
|
int n;
|
|
unsigned long vaddr;
|
|
|
|
for (n = 0; n < npages; n++) {
|
|
vaddr = get_zeroed_page(GFP_KERNEL);
|
|
if (vaddr == 0) {
|
|
while (n-- != 0)
|
|
free_page((unsigned long) map[n].ptr);
|
|
return -ENOMEM;
|
|
}
|
|
map[n].ptr = (unsigned char *) vaddr;
|
|
map[n].pg = virt_to_page(vaddr);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void mon_free_buff(struct mon_pgmap *map, int npages)
|
|
{
|
|
int n;
|
|
|
|
for (n = 0; n < npages; n++)
|
|
free_page((unsigned long) map[n].ptr);
|
|
}
|
|
|
|
int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus)
|
|
{
|
|
struct device *dev;
|
|
unsigned minor = ubus? ubus->busnum: 0;
|
|
|
|
if (minor >= MON_BIN_MAX_MINOR)
|
|
return 0;
|
|
|
|
dev = device_create(mon_bin_class, ubus? ubus->controller: NULL,
|
|
MKDEV(MAJOR(mon_bin_dev0), minor), "usbmon%d", minor);
|
|
if (IS_ERR(dev))
|
|
return 0;
|
|
|
|
mbus->classdev = dev;
|
|
return 1;
|
|
}
|
|
|
|
void mon_bin_del(struct mon_bus *mbus)
|
|
{
|
|
device_destroy(mon_bin_class, mbus->classdev->devt);
|
|
}
|
|
|
|
int __init mon_bin_init(void)
|
|
{
|
|
int rc;
|
|
|
|
mon_bin_class = class_create(THIS_MODULE, "usbmon");
|
|
if (IS_ERR(mon_bin_class)) {
|
|
rc = PTR_ERR(mon_bin_class);
|
|
goto err_class;
|
|
}
|
|
|
|
rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon");
|
|
if (rc < 0)
|
|
goto err_dev;
|
|
|
|
cdev_init(&mon_bin_cdev, &mon_fops_binary);
|
|
mon_bin_cdev.owner = THIS_MODULE;
|
|
|
|
rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR);
|
|
if (rc < 0)
|
|
goto err_add;
|
|
|
|
return 0;
|
|
|
|
err_add:
|
|
unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR);
|
|
err_dev:
|
|
class_destroy(mon_bin_class);
|
|
err_class:
|
|
return rc;
|
|
}
|
|
|
|
void mon_bin_exit(void)
|
|
{
|
|
cdev_del(&mon_bin_cdev);
|
|
unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR);
|
|
class_destroy(mon_bin_class);
|
|
}
|