16f23ee1fSPete Zaitcev /* 26f23ee1fSPete Zaitcev * The USB Monitor, inspired by Dave Harding's USBMon. 36f23ee1fSPete Zaitcev * 46f23ee1fSPete Zaitcev * This is a binary format reader. 56f23ee1fSPete Zaitcev * 66f23ee1fSPete Zaitcev * Copyright (C) 2006 Paolo Abeni (paolo.abeni@email.it) 7ce7cd137SPete Zaitcev * Copyright (C) 2006,2007 Pete Zaitcev (zaitcev@redhat.com) 86f23ee1fSPete Zaitcev */ 96f23ee1fSPete Zaitcev 106f23ee1fSPete Zaitcev #include <linux/kernel.h> 116f23ee1fSPete Zaitcev #include <linux/types.h> 126f23ee1fSPete Zaitcev #include <linux/fs.h> 136f23ee1fSPete Zaitcev #include <linux/cdev.h> 146f23ee1fSPete Zaitcev #include <linux/usb.h> 156f23ee1fSPete Zaitcev #include <linux/poll.h> 166f23ee1fSPete Zaitcev #include <linux/compat.h> 176f23ee1fSPete Zaitcev #include <linux/mm.h> 181af46fd7SJonathan Corbet #include <linux/smp_lock.h> 196f23ee1fSPete Zaitcev 206f23ee1fSPete Zaitcev #include <asm/uaccess.h> 216f23ee1fSPete Zaitcev 226f23ee1fSPete Zaitcev #include "usb_mon.h" 236f23ee1fSPete Zaitcev 246f23ee1fSPete Zaitcev /* 256f23ee1fSPete Zaitcev * Defined by USB 2.0 clause 9.3, table 9.2. 266f23ee1fSPete Zaitcev */ 276f23ee1fSPete Zaitcev #define SETUP_LEN 8 286f23ee1fSPete Zaitcev 296f23ee1fSPete Zaitcev /* ioctl macros */ 306f23ee1fSPete Zaitcev #define MON_IOC_MAGIC 0x92 316f23ee1fSPete Zaitcev 326f23ee1fSPete Zaitcev #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) 336f23ee1fSPete Zaitcev /* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */ 346f23ee1fSPete Zaitcev #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) 356f23ee1fSPete Zaitcev #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) 366f23ee1fSPete Zaitcev #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) 376f23ee1fSPete Zaitcev #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) 386f23ee1fSPete Zaitcev #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) 396f23ee1fSPete Zaitcev #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) 40471c604dSPete Zaitcev /* #9 was MON_IOCT_SETAPI */ 41471c604dSPete Zaitcev #define MON_IOCX_GETX _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get) 427abce6beSPete Zaitcev 436f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 446f23ee1fSPete Zaitcev #define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32) 456f23ee1fSPete Zaitcev #define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32) 46471c604dSPete Zaitcev #define MON_IOCX_GETX32 _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get32) 476f23ee1fSPete Zaitcev #endif 486f23ee1fSPete Zaitcev 496f23ee1fSPete Zaitcev /* 506f23ee1fSPete Zaitcev * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc). 516f23ee1fSPete Zaitcev * But it's all right. Just use a simple way to make sure the chunk is never 526f23ee1fSPete Zaitcev * smaller than a page. 536f23ee1fSPete Zaitcev * 546f23ee1fSPete Zaitcev * N.B. An application does not know our chunk size. 556f23ee1fSPete Zaitcev * 566f23ee1fSPete Zaitcev * Woops, get_zeroed_page() returns a single page. I guess we're stuck with 576f23ee1fSPete Zaitcev * page-sized chunks for the time being. 586f23ee1fSPete Zaitcev */ 596f23ee1fSPete Zaitcev #define CHUNK_SIZE PAGE_SIZE 606f23ee1fSPete Zaitcev #define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1)) 616f23ee1fSPete Zaitcev 626f23ee1fSPete Zaitcev /* 636f23ee1fSPete Zaitcev * The magic limit was calculated so that it allows the monitoring 646f23ee1fSPete Zaitcev * application to pick data once in two ticks. This way, another application, 656f23ee1fSPete Zaitcev * which presumably drives the bus, gets to hog CPU, yet we collect our data. 666f23ee1fSPete Zaitcev * If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an 676f23ee1fSPete Zaitcev * enormous overhead built into the bus protocol, so we need about 1000 KB. 686f23ee1fSPete Zaitcev * 696f23ee1fSPete Zaitcev * This is still too much for most cases, where we just snoop a few 706f23ee1fSPete Zaitcev * descriptor fetches for enumeration. So, the default is a "reasonable" 716f23ee1fSPete Zaitcev * amount for systems with HZ=250 and incomplete bus saturation. 726f23ee1fSPete Zaitcev * 736f23ee1fSPete Zaitcev * XXX What about multi-megabyte URBs which take minutes to transfer? 746f23ee1fSPete Zaitcev */ 756f23ee1fSPete Zaitcev #define BUFF_MAX CHUNK_ALIGN(1200*1024) 766f23ee1fSPete Zaitcev #define BUFF_DFL CHUNK_ALIGN(300*1024) 776f23ee1fSPete Zaitcev #define BUFF_MIN CHUNK_ALIGN(8*1024) 786f23ee1fSPete Zaitcev 796f23ee1fSPete Zaitcev /* 806f23ee1fSPete Zaitcev * The per-event API header (2 per URB). 816f23ee1fSPete Zaitcev * 826f23ee1fSPete Zaitcev * This structure is seen in userland as defined by the documentation. 836f23ee1fSPete Zaitcev */ 846f23ee1fSPete Zaitcev struct mon_bin_hdr { 856f23ee1fSPete Zaitcev u64 id; /* URB ID - from submission to callback */ 866f23ee1fSPete Zaitcev unsigned char type; /* Same as in text API; extensible. */ 876f23ee1fSPete Zaitcev unsigned char xfer_type; /* ISO, Intr, Control, Bulk */ 886f23ee1fSPete Zaitcev unsigned char epnum; /* Endpoint number and transfer direction */ 896f23ee1fSPete Zaitcev unsigned char devnum; /* Device address */ 906f23ee1fSPete Zaitcev unsigned short busnum; /* Bus number */ 916f23ee1fSPete Zaitcev char flag_setup; 926f23ee1fSPete Zaitcev char flag_data; 936f23ee1fSPete Zaitcev s64 ts_sec; /* gettimeofday */ 946f23ee1fSPete Zaitcev s32 ts_usec; /* gettimeofday */ 956f23ee1fSPete Zaitcev int status; 966f23ee1fSPete Zaitcev unsigned int len_urb; /* Length of data (submitted or actual) */ 976f23ee1fSPete Zaitcev unsigned int len_cap; /* Delivered length */ 98471c604dSPete Zaitcev union { 996f23ee1fSPete Zaitcev unsigned char setup[SETUP_LEN]; /* Only for Control S-type */ 100471c604dSPete Zaitcev struct iso_rec { 101471c604dSPete Zaitcev int error_count; 102471c604dSPete Zaitcev int numdesc; 103471c604dSPete Zaitcev } iso; 104471c604dSPete Zaitcev } s; 105471c604dSPete Zaitcev int interval; 106471c604dSPete Zaitcev int start_frame; 107471c604dSPete Zaitcev unsigned int xfer_flags; 108471c604dSPete Zaitcev unsigned int ndesc; /* Actual number of ISO descriptors */ 109471c604dSPete Zaitcev }; 110471c604dSPete Zaitcev 111471c604dSPete Zaitcev /* 112471c604dSPete Zaitcev * ISO vector, packed into the head of data stream. 113471c604dSPete Zaitcev * This has to take 16 bytes to make sure that the end of buffer 114471c604dSPete Zaitcev * wrap is not happening in the middle of a descriptor. 115471c604dSPete Zaitcev */ 116471c604dSPete Zaitcev struct mon_bin_isodesc { 117471c604dSPete Zaitcev int iso_status; 118471c604dSPete Zaitcev unsigned int iso_off; 119471c604dSPete Zaitcev unsigned int iso_len; 120471c604dSPete Zaitcev u32 _pad; 1216f23ee1fSPete Zaitcev }; 1226f23ee1fSPete Zaitcev 1236f23ee1fSPete Zaitcev /* per file statistic */ 1246f23ee1fSPete Zaitcev struct mon_bin_stats { 1256f23ee1fSPete Zaitcev u32 queued; 1266f23ee1fSPete Zaitcev u32 dropped; 1276f23ee1fSPete Zaitcev }; 1286f23ee1fSPete Zaitcev 1296f23ee1fSPete Zaitcev struct mon_bin_get { 130471c604dSPete Zaitcev struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */ 1316f23ee1fSPete Zaitcev void __user *data; 1326f23ee1fSPete Zaitcev size_t alloc; /* Length of data (can be zero) */ 1336f23ee1fSPete Zaitcev }; 1346f23ee1fSPete Zaitcev 1356f23ee1fSPete Zaitcev struct mon_bin_mfetch { 1366f23ee1fSPete Zaitcev u32 __user *offvec; /* Vector of events fetched */ 1376f23ee1fSPete Zaitcev u32 nfetch; /* Number of events to fetch (out: fetched) */ 1386f23ee1fSPete Zaitcev u32 nflush; /* Number of events to flush */ 1396f23ee1fSPete Zaitcev }; 1406f23ee1fSPete Zaitcev 1416f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 1426f23ee1fSPete Zaitcev struct mon_bin_get32 { 1436f23ee1fSPete Zaitcev u32 hdr32; 1446f23ee1fSPete Zaitcev u32 data32; 1456f23ee1fSPete Zaitcev u32 alloc32; 1466f23ee1fSPete Zaitcev }; 1476f23ee1fSPete Zaitcev 1486f23ee1fSPete Zaitcev struct mon_bin_mfetch32 { 1496f23ee1fSPete Zaitcev u32 offvec32; 1506f23ee1fSPete Zaitcev u32 nfetch32; 1516f23ee1fSPete Zaitcev u32 nflush32; 1526f23ee1fSPete Zaitcev }; 1536f23ee1fSPete Zaitcev #endif 1546f23ee1fSPete Zaitcev 1556f23ee1fSPete Zaitcev /* Having these two values same prevents wrapping of the mon_bin_hdr */ 1566f23ee1fSPete Zaitcev #define PKT_ALIGN 64 1576f23ee1fSPete Zaitcev #define PKT_SIZE 64 1586f23ee1fSPete Zaitcev 159471c604dSPete Zaitcev #define PKT_SZ_API0 48 /* API 0 (2.6.20) size */ 160471c604dSPete Zaitcev #define PKT_SZ_API1 64 /* API 1 size: extra fields */ 161471c604dSPete Zaitcev 162471c604dSPete Zaitcev #define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */ 163471c604dSPete Zaitcev 1646f23ee1fSPete Zaitcev /* max number of USB bus supported */ 1656f23ee1fSPete Zaitcev #define MON_BIN_MAX_MINOR 128 1666f23ee1fSPete Zaitcev 1676f23ee1fSPete Zaitcev /* 1686f23ee1fSPete Zaitcev * The buffer: map of used pages. 1696f23ee1fSPete Zaitcev */ 1706f23ee1fSPete Zaitcev struct mon_pgmap { 1716f23ee1fSPete Zaitcev struct page *pg; 1726f23ee1fSPete Zaitcev unsigned char *ptr; /* XXX just use page_to_virt everywhere? */ 1736f23ee1fSPete Zaitcev }; 1746f23ee1fSPete Zaitcev 1756f23ee1fSPete Zaitcev /* 1766f23ee1fSPete Zaitcev * This gets associated with an open file struct. 1776f23ee1fSPete Zaitcev */ 1786f23ee1fSPete Zaitcev struct mon_reader_bin { 1796f23ee1fSPete Zaitcev /* The buffer: one per open. */ 1806f23ee1fSPete Zaitcev spinlock_t b_lock; /* Protect b_cnt, b_in */ 1816f23ee1fSPete Zaitcev unsigned int b_size; /* Current size of the buffer - bytes */ 1826f23ee1fSPete Zaitcev unsigned int b_cnt; /* Bytes used */ 1836f23ee1fSPete Zaitcev unsigned int b_in, b_out; /* Offsets into buffer - bytes */ 1846f23ee1fSPete Zaitcev unsigned int b_read; /* Amount of read data in curr. pkt. */ 1856f23ee1fSPete Zaitcev struct mon_pgmap *b_vec; /* The map array */ 1866f23ee1fSPete Zaitcev wait_queue_head_t b_wait; /* Wait for data here */ 1876f23ee1fSPete Zaitcev 1886f23ee1fSPete Zaitcev struct mutex fetch_lock; /* Protect b_read, b_out */ 1896f23ee1fSPete Zaitcev int mmap_active; 1906f23ee1fSPete Zaitcev 1916f23ee1fSPete Zaitcev /* A list of these is needed for "bus 0". Some time later. */ 1926f23ee1fSPete Zaitcev struct mon_reader r; 1936f23ee1fSPete Zaitcev 1946f23ee1fSPete Zaitcev /* Stats */ 1956f23ee1fSPete Zaitcev unsigned int cnt_lost; 1966f23ee1fSPete Zaitcev }; 1976f23ee1fSPete Zaitcev 1986f23ee1fSPete Zaitcev static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp, 1996f23ee1fSPete Zaitcev unsigned int offset) 2006f23ee1fSPete Zaitcev { 2016f23ee1fSPete Zaitcev return (struct mon_bin_hdr *) 2026f23ee1fSPete Zaitcev (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); 2036f23ee1fSPete Zaitcev } 2046f23ee1fSPete Zaitcev 2056f23ee1fSPete Zaitcev #define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0) 2066f23ee1fSPete Zaitcev 20730c7431dSPete Zaitcev static unsigned char xfer_to_pipe[4] = { 20830c7431dSPete Zaitcev PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT 20930c7431dSPete Zaitcev }; 21030c7431dSPete Zaitcev 211ce7cd137SPete Zaitcev static struct class *mon_bin_class; 2126f23ee1fSPete Zaitcev static dev_t mon_bin_dev0; 2136f23ee1fSPete Zaitcev static struct cdev mon_bin_cdev; 2146f23ee1fSPete Zaitcev 2156f23ee1fSPete Zaitcev static void mon_buff_area_fill(const struct mon_reader_bin *rp, 2166f23ee1fSPete Zaitcev unsigned int offset, unsigned int size); 2176f23ee1fSPete Zaitcev static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp); 2186f23ee1fSPete Zaitcev static int mon_alloc_buff(struct mon_pgmap *map, int npages); 2196f23ee1fSPete Zaitcev static void mon_free_buff(struct mon_pgmap *map, int npages); 2206f23ee1fSPete Zaitcev 2216f23ee1fSPete Zaitcev /* 2226f23ee1fSPete Zaitcev * This is a "chunked memcpy". It does not manipulate any counters. 2236f23ee1fSPete Zaitcev * But it returns the new offset for repeated application. 2246f23ee1fSPete Zaitcev */ 2256f23ee1fSPete Zaitcev unsigned int mon_copy_to_buff(const struct mon_reader_bin *this, 2266f23ee1fSPete Zaitcev unsigned int off, const unsigned char *from, unsigned int length) 2276f23ee1fSPete Zaitcev { 2286f23ee1fSPete Zaitcev unsigned int step_len; 2296f23ee1fSPete Zaitcev unsigned char *buf; 2306f23ee1fSPete Zaitcev unsigned int in_page; 2316f23ee1fSPete Zaitcev 2326f23ee1fSPete Zaitcev while (length) { 2336f23ee1fSPete Zaitcev /* 2346f23ee1fSPete Zaitcev * Determine step_len. 2356f23ee1fSPete Zaitcev */ 2366f23ee1fSPete Zaitcev step_len = length; 2376f23ee1fSPete Zaitcev in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); 2386f23ee1fSPete Zaitcev if (in_page < step_len) 2396f23ee1fSPete Zaitcev step_len = in_page; 2406f23ee1fSPete Zaitcev 2416f23ee1fSPete Zaitcev /* 2426f23ee1fSPete Zaitcev * Copy data and advance pointers. 2436f23ee1fSPete Zaitcev */ 2446f23ee1fSPete Zaitcev buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; 2456f23ee1fSPete Zaitcev memcpy(buf, from, step_len); 2466f23ee1fSPete Zaitcev if ((off += step_len) >= this->b_size) off = 0; 2476f23ee1fSPete Zaitcev from += step_len; 2486f23ee1fSPete Zaitcev length -= step_len; 2496f23ee1fSPete Zaitcev } 2506f23ee1fSPete Zaitcev return off; 2516f23ee1fSPete Zaitcev } 2526f23ee1fSPete Zaitcev 2536f23ee1fSPete Zaitcev /* 2546f23ee1fSPete Zaitcev * This is a little worse than the above because it's "chunked copy_to_user". 2556f23ee1fSPete Zaitcev * The return value is an error code, not an offset. 2566f23ee1fSPete Zaitcev */ 2576f23ee1fSPete Zaitcev static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off, 2586f23ee1fSPete Zaitcev char __user *to, int length) 2596f23ee1fSPete Zaitcev { 2606f23ee1fSPete Zaitcev unsigned int step_len; 2616f23ee1fSPete Zaitcev unsigned char *buf; 2626f23ee1fSPete Zaitcev unsigned int in_page; 2636f23ee1fSPete Zaitcev 2646f23ee1fSPete Zaitcev while (length) { 2656f23ee1fSPete Zaitcev /* 2666f23ee1fSPete Zaitcev * Determine step_len. 2676f23ee1fSPete Zaitcev */ 2686f23ee1fSPete Zaitcev step_len = length; 2696f23ee1fSPete Zaitcev in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); 2706f23ee1fSPete Zaitcev if (in_page < step_len) 2716f23ee1fSPete Zaitcev step_len = in_page; 2726f23ee1fSPete Zaitcev 2736f23ee1fSPete Zaitcev /* 2746f23ee1fSPete Zaitcev * Copy data and advance pointers. 2756f23ee1fSPete Zaitcev */ 2766f23ee1fSPete Zaitcev buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; 2776f23ee1fSPete Zaitcev if (copy_to_user(to, buf, step_len)) 2786f23ee1fSPete Zaitcev return -EINVAL; 2796f23ee1fSPete Zaitcev if ((off += step_len) >= this->b_size) off = 0; 2806f23ee1fSPete Zaitcev to += step_len; 2816f23ee1fSPete Zaitcev length -= step_len; 2826f23ee1fSPete Zaitcev } 2836f23ee1fSPete Zaitcev return 0; 2846f23ee1fSPete Zaitcev } 2856f23ee1fSPete Zaitcev 2866f23ee1fSPete Zaitcev /* 2876f23ee1fSPete Zaitcev * Allocate an (aligned) area in the buffer. 2886f23ee1fSPete Zaitcev * This is called under b_lock. 2896f23ee1fSPete Zaitcev * Returns ~0 on failure. 2906f23ee1fSPete Zaitcev */ 2916f23ee1fSPete Zaitcev static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp, 2926f23ee1fSPete Zaitcev unsigned int size) 2936f23ee1fSPete Zaitcev { 2946f23ee1fSPete Zaitcev unsigned int offset; 2956f23ee1fSPete Zaitcev 2966f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 2976f23ee1fSPete Zaitcev if (rp->b_cnt + size > rp->b_size) 2986f23ee1fSPete Zaitcev return ~0; 2996f23ee1fSPete Zaitcev offset = rp->b_in; 3006f23ee1fSPete Zaitcev rp->b_cnt += size; 3016f23ee1fSPete Zaitcev if ((rp->b_in += size) >= rp->b_size) 3026f23ee1fSPete Zaitcev rp->b_in -= rp->b_size; 3036f23ee1fSPete Zaitcev return offset; 3046f23ee1fSPete Zaitcev } 3056f23ee1fSPete Zaitcev 3066f23ee1fSPete Zaitcev /* 3076f23ee1fSPete Zaitcev * This is the same thing as mon_buff_area_alloc, only it does not allow 3086f23ee1fSPete Zaitcev * buffers to wrap. This is needed by applications which pass references 3096f23ee1fSPete Zaitcev * into mmap-ed buffers up their stacks (libpcap can do that). 3106f23ee1fSPete Zaitcev * 3116f23ee1fSPete Zaitcev * Currently, we always have the header stuck with the data, although 3126f23ee1fSPete Zaitcev * it is not strictly speaking necessary. 3136f23ee1fSPete Zaitcev * 3146f23ee1fSPete Zaitcev * When a buffer would wrap, we place a filler packet to mark the space. 3156f23ee1fSPete Zaitcev */ 3166f23ee1fSPete Zaitcev static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp, 3176f23ee1fSPete Zaitcev unsigned int size) 3186f23ee1fSPete Zaitcev { 3196f23ee1fSPete Zaitcev unsigned int offset; 3206f23ee1fSPete Zaitcev unsigned int fill_size; 3216f23ee1fSPete Zaitcev 3226f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3236f23ee1fSPete Zaitcev if (rp->b_cnt + size > rp->b_size) 3246f23ee1fSPete Zaitcev return ~0; 3256f23ee1fSPete Zaitcev if (rp->b_in + size > rp->b_size) { 3266f23ee1fSPete Zaitcev /* 3276f23ee1fSPete Zaitcev * This would wrap. Find if we still have space after 3286f23ee1fSPete Zaitcev * skipping to the end of the buffer. If we do, place 3296f23ee1fSPete Zaitcev * a filler packet and allocate a new packet. 3306f23ee1fSPete Zaitcev */ 3316f23ee1fSPete Zaitcev fill_size = rp->b_size - rp->b_in; 3326f23ee1fSPete Zaitcev if (rp->b_cnt + size + fill_size > rp->b_size) 3336f23ee1fSPete Zaitcev return ~0; 3346f23ee1fSPete Zaitcev mon_buff_area_fill(rp, rp->b_in, fill_size); 3356f23ee1fSPete Zaitcev 3366f23ee1fSPete Zaitcev offset = 0; 3376f23ee1fSPete Zaitcev rp->b_in = size; 3386f23ee1fSPete Zaitcev rp->b_cnt += size + fill_size; 3396f23ee1fSPete Zaitcev } else if (rp->b_in + size == rp->b_size) { 3406f23ee1fSPete Zaitcev offset = rp->b_in; 3416f23ee1fSPete Zaitcev rp->b_in = 0; 3426f23ee1fSPete Zaitcev rp->b_cnt += size; 3436f23ee1fSPete Zaitcev } else { 3446f23ee1fSPete Zaitcev offset = rp->b_in; 3456f23ee1fSPete Zaitcev rp->b_in += size; 3466f23ee1fSPete Zaitcev rp->b_cnt += size; 3476f23ee1fSPete Zaitcev } 3486f23ee1fSPete Zaitcev return offset; 3496f23ee1fSPete Zaitcev } 3506f23ee1fSPete Zaitcev 3516f23ee1fSPete Zaitcev /* 3526f23ee1fSPete Zaitcev * Return a few (kilo-)bytes to the head of the buffer. 3536f23ee1fSPete Zaitcev * This is used if a DMA fetch fails. 3546f23ee1fSPete Zaitcev */ 3556f23ee1fSPete Zaitcev static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) 3566f23ee1fSPete Zaitcev { 3576f23ee1fSPete Zaitcev 3586f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3596f23ee1fSPete Zaitcev rp->b_cnt -= size; 3606f23ee1fSPete Zaitcev if (rp->b_in < size) 3616f23ee1fSPete Zaitcev rp->b_in += rp->b_size; 3626f23ee1fSPete Zaitcev rp->b_in -= size; 3636f23ee1fSPete Zaitcev } 3646f23ee1fSPete Zaitcev 3656f23ee1fSPete Zaitcev /* 3666f23ee1fSPete Zaitcev * This has to be called under both b_lock and fetch_lock, because 3676f23ee1fSPete Zaitcev * it accesses both b_cnt and b_out. 3686f23ee1fSPete Zaitcev */ 3696f23ee1fSPete Zaitcev static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size) 3706f23ee1fSPete Zaitcev { 3716f23ee1fSPete Zaitcev 3726f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3736f23ee1fSPete Zaitcev rp->b_cnt -= size; 3746f23ee1fSPete Zaitcev if ((rp->b_out += size) >= rp->b_size) 3756f23ee1fSPete Zaitcev rp->b_out -= rp->b_size; 3766f23ee1fSPete Zaitcev } 3776f23ee1fSPete Zaitcev 3786f23ee1fSPete Zaitcev static void mon_buff_area_fill(const struct mon_reader_bin *rp, 3796f23ee1fSPete Zaitcev unsigned int offset, unsigned int size) 3806f23ee1fSPete Zaitcev { 3816f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 3826f23ee1fSPete Zaitcev 3836f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 3846f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 3856f23ee1fSPete Zaitcev ep->type = '@'; 3866f23ee1fSPete Zaitcev ep->len_cap = size - PKT_SIZE; 3876f23ee1fSPete Zaitcev } 3886f23ee1fSPete Zaitcev 3896f23ee1fSPete Zaitcev static inline char mon_bin_get_setup(unsigned char *setupb, 3906f23ee1fSPete Zaitcev const struct urb *urb, char ev_type) 3916f23ee1fSPete Zaitcev { 3926f23ee1fSPete Zaitcev 3936f23ee1fSPete Zaitcev if (urb->setup_packet == NULL) 3946f23ee1fSPete Zaitcev return 'Z'; 3956f23ee1fSPete Zaitcev memcpy(setupb, urb->setup_packet, SETUP_LEN); 3966f23ee1fSPete Zaitcev return 0; 3976f23ee1fSPete Zaitcev } 3986f23ee1fSPete Zaitcev 3996f23ee1fSPete Zaitcev static char mon_bin_get_data(const struct mon_reader_bin *rp, 4006f23ee1fSPete Zaitcev unsigned int offset, struct urb *urb, unsigned int length) 4016f23ee1fSPete Zaitcev { 4026f23ee1fSPete Zaitcev 403ecb658d3SPete Zaitcev if (urb->dev->bus->uses_dma && 404ecb658d3SPete Zaitcev (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) { 4056f23ee1fSPete Zaitcev mon_dmapeek_vec(rp, offset, urb->transfer_dma, length); 4066f23ee1fSPete Zaitcev return 0; 4076f23ee1fSPete Zaitcev } 4086f23ee1fSPete Zaitcev 4096f23ee1fSPete Zaitcev if (urb->transfer_buffer == NULL) 4106f23ee1fSPete Zaitcev return 'Z'; 4116f23ee1fSPete Zaitcev 4126f23ee1fSPete Zaitcev mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); 4136f23ee1fSPete Zaitcev return 0; 4146f23ee1fSPete Zaitcev } 4156f23ee1fSPete Zaitcev 416471c604dSPete Zaitcev static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, 417471c604dSPete Zaitcev unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) 418471c604dSPete Zaitcev { 419471c604dSPete Zaitcev struct mon_bin_isodesc *dp; 420471c604dSPete Zaitcev struct usb_iso_packet_descriptor *fp; 421471c604dSPete Zaitcev 422471c604dSPete Zaitcev fp = urb->iso_frame_desc; 423471c604dSPete Zaitcev while (ndesc-- != 0) { 424471c604dSPete Zaitcev dp = (struct mon_bin_isodesc *) 425471c604dSPete Zaitcev (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); 426471c604dSPete Zaitcev dp->iso_status = fp->status; 427471c604dSPete Zaitcev dp->iso_off = fp->offset; 428471c604dSPete Zaitcev dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length; 429471c604dSPete Zaitcev dp->_pad = 0; 430471c604dSPete Zaitcev if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size) 431471c604dSPete Zaitcev offset = 0; 432471c604dSPete Zaitcev fp++; 433471c604dSPete Zaitcev } 434471c604dSPete Zaitcev } 435471c604dSPete Zaitcev 4366f23ee1fSPete Zaitcev static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, 4379347d51cSAlan Stern char ev_type, int status) 4386f23ee1fSPete Zaitcev { 43930c7431dSPete Zaitcev const struct usb_endpoint_descriptor *epd = &urb->ep->desc; 4406f23ee1fSPete Zaitcev unsigned long flags; 4416f23ee1fSPete Zaitcev struct timeval ts; 4426f23ee1fSPete Zaitcev unsigned int urb_length; 4436f23ee1fSPete Zaitcev unsigned int offset; 4446f23ee1fSPete Zaitcev unsigned int length; 445471c604dSPete Zaitcev unsigned int ndesc, lendesc; 44630c7431dSPete Zaitcev unsigned char dir; 4476f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 4486f23ee1fSPete Zaitcev char data_tag = 0; 4496f23ee1fSPete Zaitcev 4506f23ee1fSPete Zaitcev do_gettimeofday(&ts); 4516f23ee1fSPete Zaitcev 4526f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 4536f23ee1fSPete Zaitcev 4546f23ee1fSPete Zaitcev /* 4556f23ee1fSPete Zaitcev * Find the maximum allowable length, then allocate space. 4566f23ee1fSPete Zaitcev */ 457471c604dSPete Zaitcev if (usb_endpoint_xfer_isoc(epd)) { 458471c604dSPete Zaitcev if (urb->number_of_packets < 0) { 459471c604dSPete Zaitcev ndesc = 0; 460471c604dSPete Zaitcev } else if (urb->number_of_packets >= ISODESC_MAX) { 461471c604dSPete Zaitcev ndesc = ISODESC_MAX; 462471c604dSPete Zaitcev } else { 463471c604dSPete Zaitcev ndesc = urb->number_of_packets; 464471c604dSPete Zaitcev } 465471c604dSPete Zaitcev } else { 466471c604dSPete Zaitcev ndesc = 0; 467471c604dSPete Zaitcev } 468471c604dSPete Zaitcev lendesc = ndesc*sizeof(struct mon_bin_isodesc); 469471c604dSPete Zaitcev 4706f23ee1fSPete Zaitcev urb_length = (ev_type == 'S') ? 4716f23ee1fSPete Zaitcev urb->transfer_buffer_length : urb->actual_length; 4726f23ee1fSPete Zaitcev length = urb_length; 4736f23ee1fSPete Zaitcev 4746f23ee1fSPete Zaitcev if (length >= rp->b_size/5) 4756f23ee1fSPete Zaitcev length = rp->b_size/5; 4766f23ee1fSPete Zaitcev 47718ea5d00SAlan Stern if (usb_urb_dir_in(urb)) { 4786f23ee1fSPete Zaitcev if (ev_type == 'S') { 4796f23ee1fSPete Zaitcev length = 0; 4806f23ee1fSPete Zaitcev data_tag = '<'; 4816f23ee1fSPete Zaitcev } 48230c7431dSPete Zaitcev /* Cannot rely on endpoint number in case of control ep.0 */ 48330c7431dSPete Zaitcev dir = USB_DIR_IN; 4846f23ee1fSPete Zaitcev } else { 4856f23ee1fSPete Zaitcev if (ev_type == 'C') { 4866f23ee1fSPete Zaitcev length = 0; 4876f23ee1fSPete Zaitcev data_tag = '>'; 4886f23ee1fSPete Zaitcev } 48930c7431dSPete Zaitcev dir = 0; 4906f23ee1fSPete Zaitcev } 4916f23ee1fSPete Zaitcev 492471c604dSPete Zaitcev if (rp->mmap_active) { 493471c604dSPete Zaitcev offset = mon_buff_area_alloc_contiguous(rp, 494471c604dSPete Zaitcev length + PKT_SIZE + lendesc); 495471c604dSPete Zaitcev } else { 496471c604dSPete Zaitcev offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc); 497471c604dSPete Zaitcev } 4986f23ee1fSPete Zaitcev if (offset == ~0) { 4996f23ee1fSPete Zaitcev rp->cnt_lost++; 5006f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 5016f23ee1fSPete Zaitcev return; 5026f23ee1fSPete Zaitcev } 5036f23ee1fSPete Zaitcev 5046f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 5056f23ee1fSPete Zaitcev if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; 5066f23ee1fSPete Zaitcev 5076f23ee1fSPete Zaitcev /* 5086f23ee1fSPete Zaitcev * Fill the allocated area. 5096f23ee1fSPete Zaitcev */ 5106f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 5116f23ee1fSPete Zaitcev ep->type = ev_type; 51230c7431dSPete Zaitcev ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; 51330c7431dSPete Zaitcev ep->epnum = dir | usb_endpoint_num(epd); 51418ea5d00SAlan Stern ep->devnum = urb->dev->devnum; 515ecb658d3SPete Zaitcev ep->busnum = urb->dev->bus->busnum; 5166f23ee1fSPete Zaitcev ep->id = (unsigned long) urb; 5176f23ee1fSPete Zaitcev ep->ts_sec = ts.tv_sec; 5186f23ee1fSPete Zaitcev ep->ts_usec = ts.tv_usec; 5199347d51cSAlan Stern ep->status = status; 5206f23ee1fSPete Zaitcev ep->len_urb = urb_length; 521471c604dSPete Zaitcev ep->len_cap = length + lendesc; 522471c604dSPete Zaitcev ep->xfer_flags = urb->transfer_flags; 5236f23ee1fSPete Zaitcev 524471c604dSPete Zaitcev if (usb_endpoint_xfer_int(epd)) { 525471c604dSPete Zaitcev ep->interval = urb->interval; 526471c604dSPete Zaitcev } else if (usb_endpoint_xfer_isoc(epd)) { 527471c604dSPete Zaitcev ep->interval = urb->interval; 528471c604dSPete Zaitcev ep->start_frame = urb->start_frame; 529471c604dSPete Zaitcev ep->s.iso.error_count = urb->error_count; 530471c604dSPete Zaitcev ep->s.iso.numdesc = urb->number_of_packets; 531471c604dSPete Zaitcev } 532471c604dSPete Zaitcev 533471c604dSPete Zaitcev if (usb_endpoint_xfer_control(epd) && ev_type == 'S') { 534471c604dSPete Zaitcev ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type); 535471c604dSPete Zaitcev } else { 536471c604dSPete Zaitcev ep->flag_setup = '-'; 537471c604dSPete Zaitcev } 538471c604dSPete Zaitcev 539471c604dSPete Zaitcev if (ndesc != 0) { 540471c604dSPete Zaitcev ep->ndesc = ndesc; 541471c604dSPete Zaitcev mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc); 542471c604dSPete Zaitcev if ((offset += lendesc) >= rp->b_size) 543471c604dSPete Zaitcev offset -= rp->b_size; 544471c604dSPete Zaitcev } 545471c604dSPete Zaitcev 5466f23ee1fSPete Zaitcev if (length != 0) { 5476f23ee1fSPete Zaitcev ep->flag_data = mon_bin_get_data(rp, offset, urb, length); 5486f23ee1fSPete Zaitcev if (ep->flag_data != 0) { /* Yes, it's 0x00, not '0' */ 5496f23ee1fSPete Zaitcev ep->len_cap = 0; 5506f23ee1fSPete Zaitcev mon_buff_area_shrink(rp, length); 5516f23ee1fSPete Zaitcev } 5526f23ee1fSPete Zaitcev } else { 5536f23ee1fSPete Zaitcev ep->flag_data = data_tag; 5546f23ee1fSPete Zaitcev } 5556f23ee1fSPete Zaitcev 5566f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 5576f23ee1fSPete Zaitcev 5586f23ee1fSPete Zaitcev wake_up(&rp->b_wait); 5596f23ee1fSPete Zaitcev } 5606f23ee1fSPete Zaitcev 5616f23ee1fSPete Zaitcev static void mon_bin_submit(void *data, struct urb *urb) 5626f23ee1fSPete Zaitcev { 5636f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 5649347d51cSAlan Stern mon_bin_event(rp, urb, 'S', -EINPROGRESS); 5656f23ee1fSPete Zaitcev } 5666f23ee1fSPete Zaitcev 5679347d51cSAlan Stern static void mon_bin_complete(void *data, struct urb *urb, int status) 5686f23ee1fSPete Zaitcev { 5696f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 5709347d51cSAlan Stern mon_bin_event(rp, urb, 'C', status); 5716f23ee1fSPete Zaitcev } 5726f23ee1fSPete Zaitcev 5736f23ee1fSPete Zaitcev static void mon_bin_error(void *data, struct urb *urb, int error) 5746f23ee1fSPete Zaitcev { 5756f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 5766f23ee1fSPete Zaitcev unsigned long flags; 5776f23ee1fSPete Zaitcev unsigned int offset; 5786f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 5796f23ee1fSPete Zaitcev 5806f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 5816f23ee1fSPete Zaitcev 5826f23ee1fSPete Zaitcev offset = mon_buff_area_alloc(rp, PKT_SIZE); 5836f23ee1fSPete Zaitcev if (offset == ~0) { 5846f23ee1fSPete Zaitcev /* Not incrementing cnt_lost. Just because. */ 5856f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 5866f23ee1fSPete Zaitcev return; 5876f23ee1fSPete Zaitcev } 5886f23ee1fSPete Zaitcev 5896f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 5906f23ee1fSPete Zaitcev 5916f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 5926f23ee1fSPete Zaitcev ep->type = 'E'; 59330c7431dSPete Zaitcev ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; 59430c7431dSPete Zaitcev ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; 59530c7431dSPete Zaitcev ep->epnum |= usb_endpoint_num(&urb->ep->desc); 59618ea5d00SAlan Stern ep->devnum = urb->dev->devnum; 597ecb658d3SPete Zaitcev ep->busnum = urb->dev->bus->busnum; 5986f23ee1fSPete Zaitcev ep->id = (unsigned long) urb; 5996f23ee1fSPete Zaitcev ep->status = error; 6006f23ee1fSPete Zaitcev 6016f23ee1fSPete Zaitcev ep->flag_setup = '-'; 6026f23ee1fSPete Zaitcev ep->flag_data = 'E'; 6036f23ee1fSPete Zaitcev 6046f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 6056f23ee1fSPete Zaitcev 6066f23ee1fSPete Zaitcev wake_up(&rp->b_wait); 6076f23ee1fSPete Zaitcev } 6086f23ee1fSPete Zaitcev 6096f23ee1fSPete Zaitcev static int mon_bin_open(struct inode *inode, struct file *file) 6106f23ee1fSPete Zaitcev { 6116f23ee1fSPete Zaitcev struct mon_bus *mbus; 6126f23ee1fSPete Zaitcev struct mon_reader_bin *rp; 6136f23ee1fSPete Zaitcev size_t size; 6146f23ee1fSPete Zaitcev int rc; 6156f23ee1fSPete Zaitcev 6161af46fd7SJonathan Corbet lock_kernel(); 6176f23ee1fSPete Zaitcev mutex_lock(&mon_lock); 6186f23ee1fSPete Zaitcev if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) { 6196f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6201af46fd7SJonathan Corbet unlock_kernel(); 6216f23ee1fSPete Zaitcev return -ENODEV; 6226f23ee1fSPete Zaitcev } 623ecb658d3SPete Zaitcev if (mbus != &mon_bus0 && mbus->u_bus == NULL) { 6246f23ee1fSPete Zaitcev printk(KERN_ERR TAG ": consistency error on open\n"); 6256f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6261af46fd7SJonathan Corbet unlock_kernel(); 6276f23ee1fSPete Zaitcev return -ENODEV; 6286f23ee1fSPete Zaitcev } 6296f23ee1fSPete Zaitcev 6306f23ee1fSPete Zaitcev rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); 6316f23ee1fSPete Zaitcev if (rp == NULL) { 6326f23ee1fSPete Zaitcev rc = -ENOMEM; 6336f23ee1fSPete Zaitcev goto err_alloc; 6346f23ee1fSPete Zaitcev } 6356f23ee1fSPete Zaitcev spin_lock_init(&rp->b_lock); 6366f23ee1fSPete Zaitcev init_waitqueue_head(&rp->b_wait); 6376f23ee1fSPete Zaitcev mutex_init(&rp->fetch_lock); 6386f23ee1fSPete Zaitcev 6396f23ee1fSPete Zaitcev rp->b_size = BUFF_DFL; 6406f23ee1fSPete Zaitcev 6416f23ee1fSPete Zaitcev size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); 6426f23ee1fSPete Zaitcev if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { 6436f23ee1fSPete Zaitcev rc = -ENOMEM; 6446f23ee1fSPete Zaitcev goto err_allocvec; 6456f23ee1fSPete Zaitcev } 6466f23ee1fSPete Zaitcev 6476f23ee1fSPete Zaitcev if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) 6486f23ee1fSPete Zaitcev goto err_allocbuff; 6496f23ee1fSPete Zaitcev 6506f23ee1fSPete Zaitcev rp->r.m_bus = mbus; 6516f23ee1fSPete Zaitcev rp->r.r_data = rp; 6526f23ee1fSPete Zaitcev rp->r.rnf_submit = mon_bin_submit; 6536f23ee1fSPete Zaitcev rp->r.rnf_error = mon_bin_error; 6546f23ee1fSPete Zaitcev rp->r.rnf_complete = mon_bin_complete; 6556f23ee1fSPete Zaitcev 6566f23ee1fSPete Zaitcev mon_reader_add(mbus, &rp->r); 6576f23ee1fSPete Zaitcev 6586f23ee1fSPete Zaitcev file->private_data = rp; 6596f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6601af46fd7SJonathan Corbet unlock_kernel(); 6616f23ee1fSPete Zaitcev return 0; 6626f23ee1fSPete Zaitcev 6636f23ee1fSPete Zaitcev err_allocbuff: 6646f23ee1fSPete Zaitcev kfree(rp->b_vec); 6656f23ee1fSPete Zaitcev err_allocvec: 6666f23ee1fSPete Zaitcev kfree(rp); 6676f23ee1fSPete Zaitcev err_alloc: 6686f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6691af46fd7SJonathan Corbet unlock_kernel(); 6706f23ee1fSPete Zaitcev return rc; 6716f23ee1fSPete Zaitcev } 6726f23ee1fSPete Zaitcev 6736f23ee1fSPete Zaitcev /* 6746f23ee1fSPete Zaitcev * Extract an event from buffer and copy it to user space. 6756f23ee1fSPete Zaitcev * Wait if there is no event ready. 6766f23ee1fSPete Zaitcev * Returns zero or error. 6776f23ee1fSPete Zaitcev */ 6786f23ee1fSPete Zaitcev static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp, 679471c604dSPete Zaitcev struct mon_bin_hdr __user *hdr, unsigned int hdrbytes, 680471c604dSPete Zaitcev void __user *data, unsigned int nbytes) 6816f23ee1fSPete Zaitcev { 6826f23ee1fSPete Zaitcev unsigned long flags; 6836f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 6846f23ee1fSPete Zaitcev size_t step_len; 6856f23ee1fSPete Zaitcev unsigned int offset; 6866f23ee1fSPete Zaitcev int rc; 6876f23ee1fSPete Zaitcev 6886f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 6896f23ee1fSPete Zaitcev 6906f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 6916f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6926f23ee1fSPete Zaitcev return rc; 6936f23ee1fSPete Zaitcev } 6946f23ee1fSPete Zaitcev 6956f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 6966f23ee1fSPete Zaitcev 697471c604dSPete Zaitcev if (copy_to_user(hdr, ep, hdrbytes)) { 6986f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6996f23ee1fSPete Zaitcev return -EFAULT; 7006f23ee1fSPete Zaitcev } 7016f23ee1fSPete Zaitcev 7026f23ee1fSPete Zaitcev step_len = min(ep->len_cap, nbytes); 7036f23ee1fSPete Zaitcev if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; 7046f23ee1fSPete Zaitcev 7056f23ee1fSPete Zaitcev if (copy_from_buf(rp, offset, data, step_len)) { 7066f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7076f23ee1fSPete Zaitcev return -EFAULT; 7086f23ee1fSPete Zaitcev } 7096f23ee1fSPete Zaitcev 7106f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 7116f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 7126f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 7136f23ee1fSPete Zaitcev rp->b_read = 0; 7146f23ee1fSPete Zaitcev 7156f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7166f23ee1fSPete Zaitcev return 0; 7176f23ee1fSPete Zaitcev } 7186f23ee1fSPete Zaitcev 7196f23ee1fSPete Zaitcev static int mon_bin_release(struct inode *inode, struct file *file) 7206f23ee1fSPete Zaitcev { 7216f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 7226f23ee1fSPete Zaitcev struct mon_bus* mbus = rp->r.m_bus; 7236f23ee1fSPete Zaitcev 7246f23ee1fSPete Zaitcev mutex_lock(&mon_lock); 7256f23ee1fSPete Zaitcev 7266f23ee1fSPete Zaitcev if (mbus->nreaders <= 0) { 7276f23ee1fSPete Zaitcev printk(KERN_ERR TAG ": consistency error on close\n"); 7286f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 7296f23ee1fSPete Zaitcev return 0; 7306f23ee1fSPete Zaitcev } 7316f23ee1fSPete Zaitcev mon_reader_del(mbus, &rp->r); 7326f23ee1fSPete Zaitcev 7336f23ee1fSPete Zaitcev mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); 7346f23ee1fSPete Zaitcev kfree(rp->b_vec); 7356f23ee1fSPete Zaitcev kfree(rp); 7366f23ee1fSPete Zaitcev 7376f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 7386f23ee1fSPete Zaitcev return 0; 7396f23ee1fSPete Zaitcev } 7406f23ee1fSPete Zaitcev 7416f23ee1fSPete Zaitcev static ssize_t mon_bin_read(struct file *file, char __user *buf, 7426f23ee1fSPete Zaitcev size_t nbytes, loff_t *ppos) 7436f23ee1fSPete Zaitcev { 7446f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 745471c604dSPete Zaitcev unsigned int hdrbytes = PKT_SZ_API0; 7466f23ee1fSPete Zaitcev unsigned long flags; 7476f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 7486f23ee1fSPete Zaitcev unsigned int offset; 7496f23ee1fSPete Zaitcev size_t step_len; 7506f23ee1fSPete Zaitcev char *ptr; 7516f23ee1fSPete Zaitcev ssize_t done = 0; 7526f23ee1fSPete Zaitcev int rc; 7536f23ee1fSPete Zaitcev 7546f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 7556f23ee1fSPete Zaitcev 7566f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 7576f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7586f23ee1fSPete Zaitcev return rc; 7596f23ee1fSPete Zaitcev } 7606f23ee1fSPete Zaitcev 7616f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 7626f23ee1fSPete Zaitcev 763471c604dSPete Zaitcev if (rp->b_read < hdrbytes) { 764471c604dSPete Zaitcev step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read)); 7656f23ee1fSPete Zaitcev ptr = ((char *)ep) + rp->b_read; 7666f23ee1fSPete Zaitcev if (step_len && copy_to_user(buf, ptr, step_len)) { 7676f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7686f23ee1fSPete Zaitcev return -EFAULT; 7696f23ee1fSPete Zaitcev } 7706f23ee1fSPete Zaitcev nbytes -= step_len; 7716f23ee1fSPete Zaitcev buf += step_len; 7726f23ee1fSPete Zaitcev rp->b_read += step_len; 7736f23ee1fSPete Zaitcev done += step_len; 7746f23ee1fSPete Zaitcev } 7756f23ee1fSPete Zaitcev 776471c604dSPete Zaitcev if (rp->b_read >= hdrbytes) { 777f1c0a2a3SPete Zaitcev step_len = ep->len_cap; 778471c604dSPete Zaitcev step_len -= rp->b_read - hdrbytes; 779f1c0a2a3SPete Zaitcev if (step_len > nbytes) 780f1c0a2a3SPete Zaitcev step_len = nbytes; 7816f23ee1fSPete Zaitcev offset = rp->b_out + PKT_SIZE; 782471c604dSPete Zaitcev offset += rp->b_read - hdrbytes; 7836f23ee1fSPete Zaitcev if (offset >= rp->b_size) 7846f23ee1fSPete Zaitcev offset -= rp->b_size; 7856f23ee1fSPete Zaitcev if (copy_from_buf(rp, offset, buf, step_len)) { 7866f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7876f23ee1fSPete Zaitcev return -EFAULT; 7886f23ee1fSPete Zaitcev } 7896f23ee1fSPete Zaitcev nbytes -= step_len; 7906f23ee1fSPete Zaitcev buf += step_len; 7916f23ee1fSPete Zaitcev rp->b_read += step_len; 7926f23ee1fSPete Zaitcev done += step_len; 7936f23ee1fSPete Zaitcev } 7946f23ee1fSPete Zaitcev 7956f23ee1fSPete Zaitcev /* 7966f23ee1fSPete Zaitcev * Check if whole packet was read, and if so, jump to the next one. 7976f23ee1fSPete Zaitcev */ 798471c604dSPete Zaitcev if (rp->b_read >= hdrbytes + ep->len_cap) { 7996f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8006f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 8016f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8026f23ee1fSPete Zaitcev rp->b_read = 0; 8036f23ee1fSPete Zaitcev } 8046f23ee1fSPete Zaitcev 8056f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8066f23ee1fSPete Zaitcev return done; 8076f23ee1fSPete Zaitcev } 8086f23ee1fSPete Zaitcev 8096f23ee1fSPete Zaitcev /* 8106f23ee1fSPete Zaitcev * Remove at most nevents from chunked buffer. 8116f23ee1fSPete Zaitcev * Returns the number of removed events. 8126f23ee1fSPete Zaitcev */ 8136f23ee1fSPete Zaitcev static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) 8146f23ee1fSPete Zaitcev { 8156f23ee1fSPete Zaitcev unsigned long flags; 8166f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 8176f23ee1fSPete Zaitcev int i; 8186f23ee1fSPete Zaitcev 8196f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 8206f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8216f23ee1fSPete Zaitcev for (i = 0; i < nevents; ++i) { 8226f23ee1fSPete Zaitcev if (MON_RING_EMPTY(rp)) 8236f23ee1fSPete Zaitcev break; 8246f23ee1fSPete Zaitcev 8256f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 8266f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 8276f23ee1fSPete Zaitcev } 8286f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8296f23ee1fSPete Zaitcev rp->b_read = 0; 8306f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8316f23ee1fSPete Zaitcev return i; 8326f23ee1fSPete Zaitcev } 8336f23ee1fSPete Zaitcev 8346f23ee1fSPete Zaitcev /* 8356f23ee1fSPete Zaitcev * Fetch at most max event offsets into the buffer and put them into vec. 8366f23ee1fSPete Zaitcev * The events are usually freed later with mon_bin_flush. 8376f23ee1fSPete Zaitcev * Return the effective number of events fetched. 8386f23ee1fSPete Zaitcev */ 8396f23ee1fSPete Zaitcev static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, 8406f23ee1fSPete Zaitcev u32 __user *vec, unsigned int max) 8416f23ee1fSPete Zaitcev { 8426f23ee1fSPete Zaitcev unsigned int cur_out; 8436f23ee1fSPete Zaitcev unsigned int bytes, avail; 8446f23ee1fSPete Zaitcev unsigned int size; 8456f23ee1fSPete Zaitcev unsigned int nevents; 8466f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 8476f23ee1fSPete Zaitcev unsigned long flags; 8486f23ee1fSPete Zaitcev int rc; 8496f23ee1fSPete Zaitcev 8506f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 8516f23ee1fSPete Zaitcev 8526f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 8536f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8546f23ee1fSPete Zaitcev return rc; 8556f23ee1fSPete Zaitcev } 8566f23ee1fSPete Zaitcev 8576f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8586f23ee1fSPete Zaitcev avail = rp->b_cnt; 8596f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8606f23ee1fSPete Zaitcev 8616f23ee1fSPete Zaitcev cur_out = rp->b_out; 8626f23ee1fSPete Zaitcev nevents = 0; 8636f23ee1fSPete Zaitcev bytes = 0; 8646f23ee1fSPete Zaitcev while (bytes < avail) { 8656f23ee1fSPete Zaitcev if (nevents >= max) 8666f23ee1fSPete Zaitcev break; 8676f23ee1fSPete Zaitcev 8686f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, cur_out); 8696f23ee1fSPete Zaitcev if (put_user(cur_out, &vec[nevents])) { 8706f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8716f23ee1fSPete Zaitcev return -EFAULT; 8726f23ee1fSPete Zaitcev } 8736f23ee1fSPete Zaitcev 8746f23ee1fSPete Zaitcev nevents++; 8756f23ee1fSPete Zaitcev size = ep->len_cap + PKT_SIZE; 8766f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 8776f23ee1fSPete Zaitcev if ((cur_out += size) >= rp->b_size) 8786f23ee1fSPete Zaitcev cur_out -= rp->b_size; 8796f23ee1fSPete Zaitcev bytes += size; 8806f23ee1fSPete Zaitcev } 8816f23ee1fSPete Zaitcev 8826f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8836f23ee1fSPete Zaitcev return nevents; 8846f23ee1fSPete Zaitcev } 8856f23ee1fSPete Zaitcev 8866f23ee1fSPete Zaitcev /* 8876f23ee1fSPete Zaitcev * Count events. This is almost the same as the above mon_bin_fetch, 8886f23ee1fSPete Zaitcev * only we do not store offsets into user vector, and we have no limit. 8896f23ee1fSPete Zaitcev */ 8906f23ee1fSPete Zaitcev static int mon_bin_queued(struct mon_reader_bin *rp) 8916f23ee1fSPete Zaitcev { 8926f23ee1fSPete Zaitcev unsigned int cur_out; 8936f23ee1fSPete Zaitcev unsigned int bytes, avail; 8946f23ee1fSPete Zaitcev unsigned int size; 8956f23ee1fSPete Zaitcev unsigned int nevents; 8966f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 8976f23ee1fSPete Zaitcev unsigned long flags; 8986f23ee1fSPete Zaitcev 8996f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 9006f23ee1fSPete Zaitcev 9016f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 9026f23ee1fSPete Zaitcev avail = rp->b_cnt; 9036f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 9046f23ee1fSPete Zaitcev 9056f23ee1fSPete Zaitcev cur_out = rp->b_out; 9066f23ee1fSPete Zaitcev nevents = 0; 9076f23ee1fSPete Zaitcev bytes = 0; 9086f23ee1fSPete Zaitcev while (bytes < avail) { 9096f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, cur_out); 9106f23ee1fSPete Zaitcev 9116f23ee1fSPete Zaitcev nevents++; 9126f23ee1fSPete Zaitcev size = ep->len_cap + PKT_SIZE; 9136f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 9146f23ee1fSPete Zaitcev if ((cur_out += size) >= rp->b_size) 9156f23ee1fSPete Zaitcev cur_out -= rp->b_size; 9166f23ee1fSPete Zaitcev bytes += size; 9176f23ee1fSPete Zaitcev } 9186f23ee1fSPete Zaitcev 9196f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 9206f23ee1fSPete Zaitcev return nevents; 9216f23ee1fSPete Zaitcev } 9226f23ee1fSPete Zaitcev 9236f23ee1fSPete Zaitcev /* 9246f23ee1fSPete Zaitcev */ 9256f23ee1fSPete Zaitcev static int mon_bin_ioctl(struct inode *inode, struct file *file, 9266f23ee1fSPete Zaitcev unsigned int cmd, unsigned long arg) 9276f23ee1fSPete Zaitcev { 9286f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 9296f23ee1fSPete Zaitcev // struct mon_bus* mbus = rp->r.m_bus; 9306f23ee1fSPete Zaitcev int ret = 0; 9316f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 9326f23ee1fSPete Zaitcev unsigned long flags; 9336f23ee1fSPete Zaitcev 9346f23ee1fSPete Zaitcev switch (cmd) { 9356f23ee1fSPete Zaitcev 9366f23ee1fSPete Zaitcev case MON_IOCQ_URB_LEN: 9376f23ee1fSPete Zaitcev /* 9386f23ee1fSPete Zaitcev * N.B. This only returns the size of data, without the header. 9396f23ee1fSPete Zaitcev */ 9406f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 9416f23ee1fSPete Zaitcev if (!MON_RING_EMPTY(rp)) { 9426f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 9436f23ee1fSPete Zaitcev ret = ep->len_cap; 9446f23ee1fSPete Zaitcev } 9456f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 9466f23ee1fSPete Zaitcev break; 9476f23ee1fSPete Zaitcev 9486f23ee1fSPete Zaitcev case MON_IOCQ_RING_SIZE: 9496f23ee1fSPete Zaitcev ret = rp->b_size; 9506f23ee1fSPete Zaitcev break; 9516f23ee1fSPete Zaitcev 9526f23ee1fSPete Zaitcev case MON_IOCT_RING_SIZE: 9536f23ee1fSPete Zaitcev /* 9546f23ee1fSPete Zaitcev * Changing the buffer size will flush it's contents; the new 9556f23ee1fSPete Zaitcev * buffer is allocated before releasing the old one to be sure 9566f23ee1fSPete Zaitcev * the device will stay functional also in case of memory 9576f23ee1fSPete Zaitcev * pressure. 9586f23ee1fSPete Zaitcev */ 9596f23ee1fSPete Zaitcev { 9606f23ee1fSPete Zaitcev int size; 9616f23ee1fSPete Zaitcev struct mon_pgmap *vec; 9626f23ee1fSPete Zaitcev 9636f23ee1fSPete Zaitcev if (arg < BUFF_MIN || arg > BUFF_MAX) 9646f23ee1fSPete Zaitcev return -EINVAL; 9656f23ee1fSPete Zaitcev 9666f23ee1fSPete Zaitcev size = CHUNK_ALIGN(arg); 9676f23ee1fSPete Zaitcev if ((vec = kzalloc(sizeof(struct mon_pgmap) * (size/CHUNK_SIZE), 9686f23ee1fSPete Zaitcev GFP_KERNEL)) == NULL) { 9696f23ee1fSPete Zaitcev ret = -ENOMEM; 9706f23ee1fSPete Zaitcev break; 9716f23ee1fSPete Zaitcev } 9726f23ee1fSPete Zaitcev 9736f23ee1fSPete Zaitcev ret = mon_alloc_buff(vec, size/CHUNK_SIZE); 9746f23ee1fSPete Zaitcev if (ret < 0) { 9756f23ee1fSPete Zaitcev kfree(vec); 9766f23ee1fSPete Zaitcev break; 9776f23ee1fSPete Zaitcev } 9786f23ee1fSPete Zaitcev 9796f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 9806f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 9816f23ee1fSPete Zaitcev mon_free_buff(rp->b_vec, size/CHUNK_SIZE); 9826f23ee1fSPete Zaitcev kfree(rp->b_vec); 9836f23ee1fSPete Zaitcev rp->b_vec = vec; 9846f23ee1fSPete Zaitcev rp->b_size = size; 9856f23ee1fSPete Zaitcev rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; 9866f23ee1fSPete Zaitcev rp->cnt_lost = 0; 9876f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 9886f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 9896f23ee1fSPete Zaitcev } 9906f23ee1fSPete Zaitcev break; 9916f23ee1fSPete Zaitcev 9926f23ee1fSPete Zaitcev case MON_IOCH_MFLUSH: 9936f23ee1fSPete Zaitcev ret = mon_bin_flush(rp, arg); 9946f23ee1fSPete Zaitcev break; 9956f23ee1fSPete Zaitcev 9966f23ee1fSPete Zaitcev case MON_IOCX_GET: 997471c604dSPete Zaitcev case MON_IOCX_GETX: 9986f23ee1fSPete Zaitcev { 9996f23ee1fSPete Zaitcev struct mon_bin_get getb; 10006f23ee1fSPete Zaitcev 10016f23ee1fSPete Zaitcev if (copy_from_user(&getb, (void __user *)arg, 10026f23ee1fSPete Zaitcev sizeof(struct mon_bin_get))) 10036f23ee1fSPete Zaitcev return -EFAULT; 10046f23ee1fSPete Zaitcev 10056f23ee1fSPete Zaitcev if (getb.alloc > 0x10000000) /* Want to cast to u32 */ 10066f23ee1fSPete Zaitcev return -EINVAL; 1007471c604dSPete Zaitcev ret = mon_bin_get_event(file, rp, getb.hdr, 1008471c604dSPete Zaitcev (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1, 1009471c604dSPete Zaitcev getb.data, (unsigned int)getb.alloc); 10106f23ee1fSPete Zaitcev } 10116f23ee1fSPete Zaitcev break; 10126f23ee1fSPete Zaitcev 10136f23ee1fSPete Zaitcev case MON_IOCX_MFETCH: 10146f23ee1fSPete Zaitcev { 10156f23ee1fSPete Zaitcev struct mon_bin_mfetch mfetch; 10166f23ee1fSPete Zaitcev struct mon_bin_mfetch __user *uptr; 10176f23ee1fSPete Zaitcev 10186f23ee1fSPete Zaitcev uptr = (struct mon_bin_mfetch __user *)arg; 10196f23ee1fSPete Zaitcev 10206f23ee1fSPete Zaitcev if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) 10216f23ee1fSPete Zaitcev return -EFAULT; 10226f23ee1fSPete Zaitcev 10236f23ee1fSPete Zaitcev if (mfetch.nflush) { 10246f23ee1fSPete Zaitcev ret = mon_bin_flush(rp, mfetch.nflush); 10256f23ee1fSPete Zaitcev if (ret < 0) 10266f23ee1fSPete Zaitcev return ret; 10276f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nflush)) 10286f23ee1fSPete Zaitcev return -EFAULT; 10296f23ee1fSPete Zaitcev } 10306f23ee1fSPete Zaitcev ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); 10316f23ee1fSPete Zaitcev if (ret < 0) 10326f23ee1fSPete Zaitcev return ret; 10336f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nfetch)) 10346f23ee1fSPete Zaitcev return -EFAULT; 10356f23ee1fSPete Zaitcev ret = 0; 10366f23ee1fSPete Zaitcev } 10376f23ee1fSPete Zaitcev break; 10386f23ee1fSPete Zaitcev 10396f23ee1fSPete Zaitcev case MON_IOCG_STATS: { 10406f23ee1fSPete Zaitcev struct mon_bin_stats __user *sp; 10416f23ee1fSPete Zaitcev unsigned int nevents; 10426f23ee1fSPete Zaitcev unsigned int ndropped; 10436f23ee1fSPete Zaitcev 10446f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 10456f23ee1fSPete Zaitcev ndropped = rp->cnt_lost; 10466f23ee1fSPete Zaitcev rp->cnt_lost = 0; 10476f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 10486f23ee1fSPete Zaitcev nevents = mon_bin_queued(rp); 10496f23ee1fSPete Zaitcev 10506f23ee1fSPete Zaitcev sp = (struct mon_bin_stats __user *)arg; 10516f23ee1fSPete Zaitcev if (put_user(rp->cnt_lost, &sp->dropped)) 10526f23ee1fSPete Zaitcev return -EFAULT; 10536f23ee1fSPete Zaitcev if (put_user(nevents, &sp->queued)) 10546f23ee1fSPete Zaitcev return -EFAULT; 10556f23ee1fSPete Zaitcev 10566f23ee1fSPete Zaitcev } 10576f23ee1fSPete Zaitcev break; 10586f23ee1fSPete Zaitcev 10596f23ee1fSPete Zaitcev default: 10606f23ee1fSPete Zaitcev return -ENOTTY; 10616f23ee1fSPete Zaitcev } 10626f23ee1fSPete Zaitcev 10636f23ee1fSPete Zaitcev return ret; 10646f23ee1fSPete Zaitcev } 10656f23ee1fSPete Zaitcev 10667abce6beSPete Zaitcev #ifdef CONFIG_COMPAT 10677abce6beSPete Zaitcev static long mon_bin_compat_ioctl(struct file *file, 10687abce6beSPete Zaitcev unsigned int cmd, unsigned long arg) 10697abce6beSPete Zaitcev { 10707abce6beSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 10717abce6beSPete Zaitcev int ret; 10727abce6beSPete Zaitcev 10737abce6beSPete Zaitcev switch (cmd) { 10747abce6beSPete Zaitcev 1075471c604dSPete Zaitcev case MON_IOCX_GET32: 1076471c604dSPete Zaitcev case MON_IOCX_GETX32: 1077471c604dSPete Zaitcev { 10787abce6beSPete Zaitcev struct mon_bin_get32 getb; 10797abce6beSPete Zaitcev 10807abce6beSPete Zaitcev if (copy_from_user(&getb, (void __user *)arg, 10817abce6beSPete Zaitcev sizeof(struct mon_bin_get32))) 10827abce6beSPete Zaitcev return -EFAULT; 10837abce6beSPete Zaitcev 1084471c604dSPete Zaitcev ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32), 1085471c604dSPete Zaitcev (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1, 1086471c604dSPete Zaitcev compat_ptr(getb.data32), getb.alloc32); 10877abce6beSPete Zaitcev if (ret < 0) 10887abce6beSPete Zaitcev return ret; 10897abce6beSPete Zaitcev } 10907abce6beSPete Zaitcev return 0; 10917abce6beSPete Zaitcev 10927abce6beSPete Zaitcev case MON_IOCX_MFETCH32: 10937abce6beSPete Zaitcev { 10947abce6beSPete Zaitcev struct mon_bin_mfetch32 mfetch; 10957abce6beSPete Zaitcev struct mon_bin_mfetch32 __user *uptr; 10967abce6beSPete Zaitcev 10977abce6beSPete Zaitcev uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); 10987abce6beSPete Zaitcev 10997abce6beSPete Zaitcev if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) 11007abce6beSPete Zaitcev return -EFAULT; 11017abce6beSPete Zaitcev 11027abce6beSPete Zaitcev if (mfetch.nflush32) { 11037abce6beSPete Zaitcev ret = mon_bin_flush(rp, mfetch.nflush32); 11047abce6beSPete Zaitcev if (ret < 0) 11057abce6beSPete Zaitcev return ret; 11067abce6beSPete Zaitcev if (put_user(ret, &uptr->nflush32)) 11077abce6beSPete Zaitcev return -EFAULT; 11087abce6beSPete Zaitcev } 11097abce6beSPete Zaitcev ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), 11107abce6beSPete Zaitcev mfetch.nfetch32); 11117abce6beSPete Zaitcev if (ret < 0) 11127abce6beSPete Zaitcev return ret; 11137abce6beSPete Zaitcev if (put_user(ret, &uptr->nfetch32)) 11147abce6beSPete Zaitcev return -EFAULT; 11157abce6beSPete Zaitcev } 11167abce6beSPete Zaitcev return 0; 11177abce6beSPete Zaitcev 11187abce6beSPete Zaitcev case MON_IOCG_STATS: 11197abce6beSPete Zaitcev return mon_bin_ioctl(NULL, file, cmd, 11207abce6beSPete Zaitcev (unsigned long) compat_ptr(arg)); 11217abce6beSPete Zaitcev 11227abce6beSPete Zaitcev case MON_IOCQ_URB_LEN: 11237abce6beSPete Zaitcev case MON_IOCQ_RING_SIZE: 11247abce6beSPete Zaitcev case MON_IOCT_RING_SIZE: 11257abce6beSPete Zaitcev case MON_IOCH_MFLUSH: 11267abce6beSPete Zaitcev return mon_bin_ioctl(NULL, file, cmd, arg); 11277abce6beSPete Zaitcev 11287abce6beSPete Zaitcev default: 11297abce6beSPete Zaitcev ; 11307abce6beSPete Zaitcev } 11317abce6beSPete Zaitcev return -ENOTTY; 11327abce6beSPete Zaitcev } 11337abce6beSPete Zaitcev #endif /* CONFIG_COMPAT */ 11347abce6beSPete Zaitcev 11356f23ee1fSPete Zaitcev static unsigned int 11366f23ee1fSPete Zaitcev mon_bin_poll(struct file *file, struct poll_table_struct *wait) 11376f23ee1fSPete Zaitcev { 11386f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 11396f23ee1fSPete Zaitcev unsigned int mask = 0; 11406f23ee1fSPete Zaitcev unsigned long flags; 11416f23ee1fSPete Zaitcev 11426f23ee1fSPete Zaitcev if (file->f_mode & FMODE_READ) 11436f23ee1fSPete Zaitcev poll_wait(file, &rp->b_wait, wait); 11446f23ee1fSPete Zaitcev 11456f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 11466f23ee1fSPete Zaitcev if (!MON_RING_EMPTY(rp)) 11476f23ee1fSPete Zaitcev mask |= POLLIN | POLLRDNORM; /* readable */ 11486f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 11496f23ee1fSPete Zaitcev return mask; 11506f23ee1fSPete Zaitcev } 11516f23ee1fSPete Zaitcev 11526f23ee1fSPete Zaitcev /* 11536f23ee1fSPete Zaitcev * open and close: just keep track of how many times the device is 11546f23ee1fSPete Zaitcev * mapped, to use the proper memory allocation function. 11556f23ee1fSPete Zaitcev */ 11566f23ee1fSPete Zaitcev static void mon_bin_vma_open(struct vm_area_struct *vma) 11576f23ee1fSPete Zaitcev { 11586f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 11596f23ee1fSPete Zaitcev rp->mmap_active++; 11606f23ee1fSPete Zaitcev } 11616f23ee1fSPete Zaitcev 11626f23ee1fSPete Zaitcev static void mon_bin_vma_close(struct vm_area_struct *vma) 11636f23ee1fSPete Zaitcev { 11646f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 11656f23ee1fSPete Zaitcev rp->mmap_active--; 11666f23ee1fSPete Zaitcev } 11676f23ee1fSPete Zaitcev 11686f23ee1fSPete Zaitcev /* 11696f23ee1fSPete Zaitcev * Map ring pages to user space. 11706f23ee1fSPete Zaitcev */ 1171041509dbSNick Piggin static int mon_bin_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 11726f23ee1fSPete Zaitcev { 11736f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 11746f23ee1fSPete Zaitcev unsigned long offset, chunk_idx; 11756f23ee1fSPete Zaitcev struct page *pageptr; 11766f23ee1fSPete Zaitcev 1177041509dbSNick Piggin offset = vmf->pgoff << PAGE_SHIFT; 11786f23ee1fSPete Zaitcev if (offset >= rp->b_size) 1179041509dbSNick Piggin return VM_FAULT_SIGBUS; 11806f23ee1fSPete Zaitcev chunk_idx = offset / CHUNK_SIZE; 11816f23ee1fSPete Zaitcev pageptr = rp->b_vec[chunk_idx].pg; 11826f23ee1fSPete Zaitcev get_page(pageptr); 1183041509dbSNick Piggin vmf->page = pageptr; 1184041509dbSNick Piggin return 0; 11856f23ee1fSPete Zaitcev } 11866f23ee1fSPete Zaitcev 1187454459b0SPete Zaitcev static struct vm_operations_struct mon_bin_vm_ops = { 11886f23ee1fSPete Zaitcev .open = mon_bin_vma_open, 11896f23ee1fSPete Zaitcev .close = mon_bin_vma_close, 1190041509dbSNick Piggin .fault = mon_bin_vma_fault, 11916f23ee1fSPete Zaitcev }; 11926f23ee1fSPete Zaitcev 1193454459b0SPete Zaitcev static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma) 11946f23ee1fSPete Zaitcev { 1195041509dbSNick Piggin /* don't do anything here: "fault" will set up page table entries */ 11966f23ee1fSPete Zaitcev vma->vm_ops = &mon_bin_vm_ops; 11976f23ee1fSPete Zaitcev vma->vm_flags |= VM_RESERVED; 11986f23ee1fSPete Zaitcev vma->vm_private_data = filp->private_data; 11996f23ee1fSPete Zaitcev mon_bin_vma_open(vma); 12006f23ee1fSPete Zaitcev return 0; 12016f23ee1fSPete Zaitcev } 12026f23ee1fSPete Zaitcev 12030b3f5fe6SJan Engelhardt static const struct file_operations mon_fops_binary = { 12046f23ee1fSPete Zaitcev .owner = THIS_MODULE, 12056f23ee1fSPete Zaitcev .open = mon_bin_open, 12066f23ee1fSPete Zaitcev .llseek = no_llseek, 12076f23ee1fSPete Zaitcev .read = mon_bin_read, 12086f23ee1fSPete Zaitcev /* .write = mon_text_write, */ 12096f23ee1fSPete Zaitcev .poll = mon_bin_poll, 12106f23ee1fSPete Zaitcev .ioctl = mon_bin_ioctl, 12117abce6beSPete Zaitcev #ifdef CONFIG_COMPAT 12127abce6beSPete Zaitcev .compat_ioctl = mon_bin_compat_ioctl, 12137abce6beSPete Zaitcev #endif 12146f23ee1fSPete Zaitcev .release = mon_bin_release, 1215454459b0SPete Zaitcev .mmap = mon_bin_mmap, 12166f23ee1fSPete Zaitcev }; 12176f23ee1fSPete Zaitcev 12186f23ee1fSPete Zaitcev static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) 12196f23ee1fSPete Zaitcev { 12206f23ee1fSPete Zaitcev DECLARE_WAITQUEUE(waita, current); 12216f23ee1fSPete Zaitcev unsigned long flags; 12226f23ee1fSPete Zaitcev 12236f23ee1fSPete Zaitcev add_wait_queue(&rp->b_wait, &waita); 12246f23ee1fSPete Zaitcev set_current_state(TASK_INTERRUPTIBLE); 12256f23ee1fSPete Zaitcev 12266f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 12276f23ee1fSPete Zaitcev while (MON_RING_EMPTY(rp)) { 12286f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 12296f23ee1fSPete Zaitcev 12306f23ee1fSPete Zaitcev if (file->f_flags & O_NONBLOCK) { 12316f23ee1fSPete Zaitcev set_current_state(TASK_RUNNING); 12326f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 12336f23ee1fSPete Zaitcev return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ 12346f23ee1fSPete Zaitcev } 12356f23ee1fSPete Zaitcev schedule(); 12366f23ee1fSPete Zaitcev if (signal_pending(current)) { 12376f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 12386f23ee1fSPete Zaitcev return -EINTR; 12396f23ee1fSPete Zaitcev } 12406f23ee1fSPete Zaitcev set_current_state(TASK_INTERRUPTIBLE); 12416f23ee1fSPete Zaitcev 12426f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 12436f23ee1fSPete Zaitcev } 12446f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 12456f23ee1fSPete Zaitcev 12466f23ee1fSPete Zaitcev set_current_state(TASK_RUNNING); 12476f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 12486f23ee1fSPete Zaitcev return 0; 12496f23ee1fSPete Zaitcev } 12506f23ee1fSPete Zaitcev 12516f23ee1fSPete Zaitcev static int mon_alloc_buff(struct mon_pgmap *map, int npages) 12526f23ee1fSPete Zaitcev { 12536f23ee1fSPete Zaitcev int n; 12546f23ee1fSPete Zaitcev unsigned long vaddr; 12556f23ee1fSPete Zaitcev 12566f23ee1fSPete Zaitcev for (n = 0; n < npages; n++) { 12576f23ee1fSPete Zaitcev vaddr = get_zeroed_page(GFP_KERNEL); 12586f23ee1fSPete Zaitcev if (vaddr == 0) { 12596f23ee1fSPete Zaitcev while (n-- != 0) 12606f23ee1fSPete Zaitcev free_page((unsigned long) map[n].ptr); 12616f23ee1fSPete Zaitcev return -ENOMEM; 12626f23ee1fSPete Zaitcev } 12636f23ee1fSPete Zaitcev map[n].ptr = (unsigned char *) vaddr; 12646f23ee1fSPete Zaitcev map[n].pg = virt_to_page(vaddr); 12656f23ee1fSPete Zaitcev } 12666f23ee1fSPete Zaitcev return 0; 12676f23ee1fSPete Zaitcev } 12686f23ee1fSPete Zaitcev 12696f23ee1fSPete Zaitcev static void mon_free_buff(struct mon_pgmap *map, int npages) 12706f23ee1fSPete Zaitcev { 12716f23ee1fSPete Zaitcev int n; 12726f23ee1fSPete Zaitcev 12736f23ee1fSPete Zaitcev for (n = 0; n < npages; n++) 12746f23ee1fSPete Zaitcev free_page((unsigned long) map[n].ptr); 12756f23ee1fSPete Zaitcev } 12766f23ee1fSPete Zaitcev 1277ce7cd137SPete Zaitcev int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) 1278ce7cd137SPete Zaitcev { 1279ce7cd137SPete Zaitcev struct device *dev; 1280ce7cd137SPete Zaitcev unsigned minor = ubus? ubus->busnum: 0; 1281ce7cd137SPete Zaitcev 1282ce7cd137SPete Zaitcev if (minor >= MON_BIN_MAX_MINOR) 1283ce7cd137SPete Zaitcev return 0; 1284ce7cd137SPete Zaitcev 1285b0b090e5SGreg Kroah-Hartman dev = device_create(mon_bin_class, ubus ? ubus->controller : NULL, 1286bc00bc92SGreg Kroah-Hartman MKDEV(MAJOR(mon_bin_dev0), minor), NULL, 1287bc00bc92SGreg Kroah-Hartman "usbmon%d", minor); 1288ce7cd137SPete Zaitcev if (IS_ERR(dev)) 1289ce7cd137SPete Zaitcev return 0; 1290ce7cd137SPete Zaitcev 1291ce7cd137SPete Zaitcev mbus->classdev = dev; 1292ce7cd137SPete Zaitcev return 1; 1293ce7cd137SPete Zaitcev } 1294ce7cd137SPete Zaitcev 1295ce7cd137SPete Zaitcev void mon_bin_del(struct mon_bus *mbus) 1296ce7cd137SPete Zaitcev { 1297ce7cd137SPete Zaitcev device_destroy(mon_bin_class, mbus->classdev->devt); 1298ce7cd137SPete Zaitcev } 1299ce7cd137SPete Zaitcev 13006f23ee1fSPete Zaitcev int __init mon_bin_init(void) 13016f23ee1fSPete Zaitcev { 13026f23ee1fSPete Zaitcev int rc; 13036f23ee1fSPete Zaitcev 1304ce7cd137SPete Zaitcev mon_bin_class = class_create(THIS_MODULE, "usbmon"); 1305ce7cd137SPete Zaitcev if (IS_ERR(mon_bin_class)) { 1306ce7cd137SPete Zaitcev rc = PTR_ERR(mon_bin_class); 1307ce7cd137SPete Zaitcev goto err_class; 1308ce7cd137SPete Zaitcev } 1309ce7cd137SPete Zaitcev 13106f23ee1fSPete Zaitcev rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); 13116f23ee1fSPete Zaitcev if (rc < 0) 13126f23ee1fSPete Zaitcev goto err_dev; 13136f23ee1fSPete Zaitcev 13146f23ee1fSPete Zaitcev cdev_init(&mon_bin_cdev, &mon_fops_binary); 13156f23ee1fSPete Zaitcev mon_bin_cdev.owner = THIS_MODULE; 13166f23ee1fSPete Zaitcev 13176f23ee1fSPete Zaitcev rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); 13186f23ee1fSPete Zaitcev if (rc < 0) 13196f23ee1fSPete Zaitcev goto err_add; 13206f23ee1fSPete Zaitcev 13216f23ee1fSPete Zaitcev return 0; 13226f23ee1fSPete Zaitcev 13236f23ee1fSPete Zaitcev err_add: 13246f23ee1fSPete Zaitcev unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); 13256f23ee1fSPete Zaitcev err_dev: 1326ce7cd137SPete Zaitcev class_destroy(mon_bin_class); 1327ce7cd137SPete Zaitcev err_class: 13286f23ee1fSPete Zaitcev return rc; 13296f23ee1fSPete Zaitcev } 13306f23ee1fSPete Zaitcev 133121641e3fSPete Zaitcev void mon_bin_exit(void) 13326f23ee1fSPete Zaitcev { 13336f23ee1fSPete Zaitcev cdev_del(&mon_bin_cdev); 13346f23ee1fSPete Zaitcev unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); 1335ce7cd137SPete Zaitcev class_destroy(mon_bin_class); 13366f23ee1fSPete Zaitcev } 1337