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> 186f23ee1fSPete Zaitcev 196f23ee1fSPete Zaitcev #include <asm/uaccess.h> 206f23ee1fSPete Zaitcev 216f23ee1fSPete Zaitcev #include "usb_mon.h" 226f23ee1fSPete Zaitcev 236f23ee1fSPete Zaitcev /* 246f23ee1fSPete Zaitcev * Defined by USB 2.0 clause 9.3, table 9.2. 256f23ee1fSPete Zaitcev */ 266f23ee1fSPete Zaitcev #define SETUP_LEN 8 276f23ee1fSPete Zaitcev 286f23ee1fSPete Zaitcev /* ioctl macros */ 296f23ee1fSPete Zaitcev #define MON_IOC_MAGIC 0x92 306f23ee1fSPete Zaitcev 316f23ee1fSPete Zaitcev #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) 326f23ee1fSPete Zaitcev /* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */ 336f23ee1fSPete Zaitcev #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) 346f23ee1fSPete Zaitcev #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) 356f23ee1fSPete Zaitcev #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) 366f23ee1fSPete Zaitcev #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) 376f23ee1fSPete Zaitcev #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) 386f23ee1fSPete Zaitcev #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) 396f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 406f23ee1fSPete Zaitcev #define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32) 416f23ee1fSPete Zaitcev #define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32) 426f23ee1fSPete Zaitcev #endif 436f23ee1fSPete Zaitcev 446f23ee1fSPete Zaitcev /* 456f23ee1fSPete Zaitcev * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc). 466f23ee1fSPete Zaitcev * But it's all right. Just use a simple way to make sure the chunk is never 476f23ee1fSPete Zaitcev * smaller than a page. 486f23ee1fSPete Zaitcev * 496f23ee1fSPete Zaitcev * N.B. An application does not know our chunk size. 506f23ee1fSPete Zaitcev * 516f23ee1fSPete Zaitcev * Woops, get_zeroed_page() returns a single page. I guess we're stuck with 526f23ee1fSPete Zaitcev * page-sized chunks for the time being. 536f23ee1fSPete Zaitcev */ 546f23ee1fSPete Zaitcev #define CHUNK_SIZE PAGE_SIZE 556f23ee1fSPete Zaitcev #define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1)) 566f23ee1fSPete Zaitcev 576f23ee1fSPete Zaitcev /* 586f23ee1fSPete Zaitcev * The magic limit was calculated so that it allows the monitoring 596f23ee1fSPete Zaitcev * application to pick data once in two ticks. This way, another application, 606f23ee1fSPete Zaitcev * which presumably drives the bus, gets to hog CPU, yet we collect our data. 616f23ee1fSPete Zaitcev * If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an 626f23ee1fSPete Zaitcev * enormous overhead built into the bus protocol, so we need about 1000 KB. 636f23ee1fSPete Zaitcev * 646f23ee1fSPete Zaitcev * This is still too much for most cases, where we just snoop a few 656f23ee1fSPete Zaitcev * descriptor fetches for enumeration. So, the default is a "reasonable" 666f23ee1fSPete Zaitcev * amount for systems with HZ=250 and incomplete bus saturation. 676f23ee1fSPete Zaitcev * 686f23ee1fSPete Zaitcev * XXX What about multi-megabyte URBs which take minutes to transfer? 696f23ee1fSPete Zaitcev */ 706f23ee1fSPete Zaitcev #define BUFF_MAX CHUNK_ALIGN(1200*1024) 716f23ee1fSPete Zaitcev #define BUFF_DFL CHUNK_ALIGN(300*1024) 726f23ee1fSPete Zaitcev #define BUFF_MIN CHUNK_ALIGN(8*1024) 736f23ee1fSPete Zaitcev 746f23ee1fSPete Zaitcev /* 756f23ee1fSPete Zaitcev * The per-event API header (2 per URB). 766f23ee1fSPete Zaitcev * 776f23ee1fSPete Zaitcev * This structure is seen in userland as defined by the documentation. 786f23ee1fSPete Zaitcev */ 796f23ee1fSPete Zaitcev struct mon_bin_hdr { 806f23ee1fSPete Zaitcev u64 id; /* URB ID - from submission to callback */ 816f23ee1fSPete Zaitcev unsigned char type; /* Same as in text API; extensible. */ 826f23ee1fSPete Zaitcev unsigned char xfer_type; /* ISO, Intr, Control, Bulk */ 836f23ee1fSPete Zaitcev unsigned char epnum; /* Endpoint number and transfer direction */ 846f23ee1fSPete Zaitcev unsigned char devnum; /* Device address */ 856f23ee1fSPete Zaitcev unsigned short busnum; /* Bus number */ 866f23ee1fSPete Zaitcev char flag_setup; 876f23ee1fSPete Zaitcev char flag_data; 886f23ee1fSPete Zaitcev s64 ts_sec; /* gettimeofday */ 896f23ee1fSPete Zaitcev s32 ts_usec; /* gettimeofday */ 906f23ee1fSPete Zaitcev int status; 916f23ee1fSPete Zaitcev unsigned int len_urb; /* Length of data (submitted or actual) */ 926f23ee1fSPete Zaitcev unsigned int len_cap; /* Delivered length */ 936f23ee1fSPete Zaitcev unsigned char setup[SETUP_LEN]; /* Only for Control S-type */ 946f23ee1fSPete Zaitcev }; 956f23ee1fSPete Zaitcev 966f23ee1fSPete Zaitcev /* per file statistic */ 976f23ee1fSPete Zaitcev struct mon_bin_stats { 986f23ee1fSPete Zaitcev u32 queued; 996f23ee1fSPete Zaitcev u32 dropped; 1006f23ee1fSPete Zaitcev }; 1016f23ee1fSPete Zaitcev 1026f23ee1fSPete Zaitcev struct mon_bin_get { 1036f23ee1fSPete Zaitcev struct mon_bin_hdr __user *hdr; /* Only 48 bytes, not 64. */ 1046f23ee1fSPete Zaitcev void __user *data; 1056f23ee1fSPete Zaitcev size_t alloc; /* Length of data (can be zero) */ 1066f23ee1fSPete Zaitcev }; 1076f23ee1fSPete Zaitcev 1086f23ee1fSPete Zaitcev struct mon_bin_mfetch { 1096f23ee1fSPete Zaitcev u32 __user *offvec; /* Vector of events fetched */ 1106f23ee1fSPete Zaitcev u32 nfetch; /* Number of events to fetch (out: fetched) */ 1116f23ee1fSPete Zaitcev u32 nflush; /* Number of events to flush */ 1126f23ee1fSPete Zaitcev }; 1136f23ee1fSPete Zaitcev 1146f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 1156f23ee1fSPete Zaitcev struct mon_bin_get32 { 1166f23ee1fSPete Zaitcev u32 hdr32; 1176f23ee1fSPete Zaitcev u32 data32; 1186f23ee1fSPete Zaitcev u32 alloc32; 1196f23ee1fSPete Zaitcev }; 1206f23ee1fSPete Zaitcev 1216f23ee1fSPete Zaitcev struct mon_bin_mfetch32 { 1226f23ee1fSPete Zaitcev u32 offvec32; 1236f23ee1fSPete Zaitcev u32 nfetch32; 1246f23ee1fSPete Zaitcev u32 nflush32; 1256f23ee1fSPete Zaitcev }; 1266f23ee1fSPete Zaitcev #endif 1276f23ee1fSPete Zaitcev 1286f23ee1fSPete Zaitcev /* Having these two values same prevents wrapping of the mon_bin_hdr */ 1296f23ee1fSPete Zaitcev #define PKT_ALIGN 64 1306f23ee1fSPete Zaitcev #define PKT_SIZE 64 1316f23ee1fSPete Zaitcev 1326f23ee1fSPete Zaitcev /* max number of USB bus supported */ 1336f23ee1fSPete Zaitcev #define MON_BIN_MAX_MINOR 128 1346f23ee1fSPete Zaitcev 1356f23ee1fSPete Zaitcev /* 1366f23ee1fSPete Zaitcev * The buffer: map of used pages. 1376f23ee1fSPete Zaitcev */ 1386f23ee1fSPete Zaitcev struct mon_pgmap { 1396f23ee1fSPete Zaitcev struct page *pg; 1406f23ee1fSPete Zaitcev unsigned char *ptr; /* XXX just use page_to_virt everywhere? */ 1416f23ee1fSPete Zaitcev }; 1426f23ee1fSPete Zaitcev 1436f23ee1fSPete Zaitcev /* 1446f23ee1fSPete Zaitcev * This gets associated with an open file struct. 1456f23ee1fSPete Zaitcev */ 1466f23ee1fSPete Zaitcev struct mon_reader_bin { 1476f23ee1fSPete Zaitcev /* The buffer: one per open. */ 1486f23ee1fSPete Zaitcev spinlock_t b_lock; /* Protect b_cnt, b_in */ 1496f23ee1fSPete Zaitcev unsigned int b_size; /* Current size of the buffer - bytes */ 1506f23ee1fSPete Zaitcev unsigned int b_cnt; /* Bytes used */ 1516f23ee1fSPete Zaitcev unsigned int b_in, b_out; /* Offsets into buffer - bytes */ 1526f23ee1fSPete Zaitcev unsigned int b_read; /* Amount of read data in curr. pkt. */ 1536f23ee1fSPete Zaitcev struct mon_pgmap *b_vec; /* The map array */ 1546f23ee1fSPete Zaitcev wait_queue_head_t b_wait; /* Wait for data here */ 1556f23ee1fSPete Zaitcev 1566f23ee1fSPete Zaitcev struct mutex fetch_lock; /* Protect b_read, b_out */ 1576f23ee1fSPete Zaitcev int mmap_active; 1586f23ee1fSPete Zaitcev 1596f23ee1fSPete Zaitcev /* A list of these is needed for "bus 0". Some time later. */ 1606f23ee1fSPete Zaitcev struct mon_reader r; 1616f23ee1fSPete Zaitcev 1626f23ee1fSPete Zaitcev /* Stats */ 1636f23ee1fSPete Zaitcev unsigned int cnt_lost; 1646f23ee1fSPete Zaitcev }; 1656f23ee1fSPete Zaitcev 1666f23ee1fSPete Zaitcev static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp, 1676f23ee1fSPete Zaitcev unsigned int offset) 1686f23ee1fSPete Zaitcev { 1696f23ee1fSPete Zaitcev return (struct mon_bin_hdr *) 1706f23ee1fSPete Zaitcev (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); 1716f23ee1fSPete Zaitcev } 1726f23ee1fSPete Zaitcev 1736f23ee1fSPete Zaitcev #define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0) 1746f23ee1fSPete Zaitcev 17530c7431dSPete Zaitcev static unsigned char xfer_to_pipe[4] = { 17630c7431dSPete Zaitcev PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT 17730c7431dSPete Zaitcev }; 17830c7431dSPete Zaitcev 179ce7cd137SPete Zaitcev static struct class *mon_bin_class; 1806f23ee1fSPete Zaitcev static dev_t mon_bin_dev0; 1816f23ee1fSPete Zaitcev static struct cdev mon_bin_cdev; 1826f23ee1fSPete Zaitcev 1836f23ee1fSPete Zaitcev static void mon_buff_area_fill(const struct mon_reader_bin *rp, 1846f23ee1fSPete Zaitcev unsigned int offset, unsigned int size); 1856f23ee1fSPete Zaitcev static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp); 1866f23ee1fSPete Zaitcev static int mon_alloc_buff(struct mon_pgmap *map, int npages); 1876f23ee1fSPete Zaitcev static void mon_free_buff(struct mon_pgmap *map, int npages); 1886f23ee1fSPete Zaitcev 1896f23ee1fSPete Zaitcev /* 1906f23ee1fSPete Zaitcev * This is a "chunked memcpy". It does not manipulate any counters. 1916f23ee1fSPete Zaitcev * But it returns the new offset for repeated application. 1926f23ee1fSPete Zaitcev */ 1936f23ee1fSPete Zaitcev unsigned int mon_copy_to_buff(const struct mon_reader_bin *this, 1946f23ee1fSPete Zaitcev unsigned int off, const unsigned char *from, unsigned int length) 1956f23ee1fSPete Zaitcev { 1966f23ee1fSPete Zaitcev unsigned int step_len; 1976f23ee1fSPete Zaitcev unsigned char *buf; 1986f23ee1fSPete Zaitcev unsigned int in_page; 1996f23ee1fSPete Zaitcev 2006f23ee1fSPete Zaitcev while (length) { 2016f23ee1fSPete Zaitcev /* 2026f23ee1fSPete Zaitcev * Determine step_len. 2036f23ee1fSPete Zaitcev */ 2046f23ee1fSPete Zaitcev step_len = length; 2056f23ee1fSPete Zaitcev in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); 2066f23ee1fSPete Zaitcev if (in_page < step_len) 2076f23ee1fSPete Zaitcev step_len = in_page; 2086f23ee1fSPete Zaitcev 2096f23ee1fSPete Zaitcev /* 2106f23ee1fSPete Zaitcev * Copy data and advance pointers. 2116f23ee1fSPete Zaitcev */ 2126f23ee1fSPete Zaitcev buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; 2136f23ee1fSPete Zaitcev memcpy(buf, from, step_len); 2146f23ee1fSPete Zaitcev if ((off += step_len) >= this->b_size) off = 0; 2156f23ee1fSPete Zaitcev from += step_len; 2166f23ee1fSPete Zaitcev length -= step_len; 2176f23ee1fSPete Zaitcev } 2186f23ee1fSPete Zaitcev return off; 2196f23ee1fSPete Zaitcev } 2206f23ee1fSPete Zaitcev 2216f23ee1fSPete Zaitcev /* 2226f23ee1fSPete Zaitcev * This is a little worse than the above because it's "chunked copy_to_user". 2236f23ee1fSPete Zaitcev * The return value is an error code, not an offset. 2246f23ee1fSPete Zaitcev */ 2256f23ee1fSPete Zaitcev static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off, 2266f23ee1fSPete Zaitcev char __user *to, 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 if (copy_to_user(to, buf, step_len)) 2466f23ee1fSPete Zaitcev return -EINVAL; 2476f23ee1fSPete Zaitcev if ((off += step_len) >= this->b_size) off = 0; 2486f23ee1fSPete Zaitcev to += step_len; 2496f23ee1fSPete Zaitcev length -= step_len; 2506f23ee1fSPete Zaitcev } 2516f23ee1fSPete Zaitcev return 0; 2526f23ee1fSPete Zaitcev } 2536f23ee1fSPete Zaitcev 2546f23ee1fSPete Zaitcev /* 2556f23ee1fSPete Zaitcev * Allocate an (aligned) area in the buffer. 2566f23ee1fSPete Zaitcev * This is called under b_lock. 2576f23ee1fSPete Zaitcev * Returns ~0 on failure. 2586f23ee1fSPete Zaitcev */ 2596f23ee1fSPete Zaitcev static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp, 2606f23ee1fSPete Zaitcev unsigned int size) 2616f23ee1fSPete Zaitcev { 2626f23ee1fSPete Zaitcev unsigned int offset; 2636f23ee1fSPete Zaitcev 2646f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 2656f23ee1fSPete Zaitcev if (rp->b_cnt + size > rp->b_size) 2666f23ee1fSPete Zaitcev return ~0; 2676f23ee1fSPete Zaitcev offset = rp->b_in; 2686f23ee1fSPete Zaitcev rp->b_cnt += size; 2696f23ee1fSPete Zaitcev if ((rp->b_in += size) >= rp->b_size) 2706f23ee1fSPete Zaitcev rp->b_in -= rp->b_size; 2716f23ee1fSPete Zaitcev return offset; 2726f23ee1fSPete Zaitcev } 2736f23ee1fSPete Zaitcev 2746f23ee1fSPete Zaitcev /* 2756f23ee1fSPete Zaitcev * This is the same thing as mon_buff_area_alloc, only it does not allow 2766f23ee1fSPete Zaitcev * buffers to wrap. This is needed by applications which pass references 2776f23ee1fSPete Zaitcev * into mmap-ed buffers up their stacks (libpcap can do that). 2786f23ee1fSPete Zaitcev * 2796f23ee1fSPete Zaitcev * Currently, we always have the header stuck with the data, although 2806f23ee1fSPete Zaitcev * it is not strictly speaking necessary. 2816f23ee1fSPete Zaitcev * 2826f23ee1fSPete Zaitcev * When a buffer would wrap, we place a filler packet to mark the space. 2836f23ee1fSPete Zaitcev */ 2846f23ee1fSPete Zaitcev static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp, 2856f23ee1fSPete Zaitcev unsigned int size) 2866f23ee1fSPete Zaitcev { 2876f23ee1fSPete Zaitcev unsigned int offset; 2886f23ee1fSPete Zaitcev unsigned int fill_size; 2896f23ee1fSPete Zaitcev 2906f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 2916f23ee1fSPete Zaitcev if (rp->b_cnt + size > rp->b_size) 2926f23ee1fSPete Zaitcev return ~0; 2936f23ee1fSPete Zaitcev if (rp->b_in + size > rp->b_size) { 2946f23ee1fSPete Zaitcev /* 2956f23ee1fSPete Zaitcev * This would wrap. Find if we still have space after 2966f23ee1fSPete Zaitcev * skipping to the end of the buffer. If we do, place 2976f23ee1fSPete Zaitcev * a filler packet and allocate a new packet. 2986f23ee1fSPete Zaitcev */ 2996f23ee1fSPete Zaitcev fill_size = rp->b_size - rp->b_in; 3006f23ee1fSPete Zaitcev if (rp->b_cnt + size + fill_size > rp->b_size) 3016f23ee1fSPete Zaitcev return ~0; 3026f23ee1fSPete Zaitcev mon_buff_area_fill(rp, rp->b_in, fill_size); 3036f23ee1fSPete Zaitcev 3046f23ee1fSPete Zaitcev offset = 0; 3056f23ee1fSPete Zaitcev rp->b_in = size; 3066f23ee1fSPete Zaitcev rp->b_cnt += size + fill_size; 3076f23ee1fSPete Zaitcev } else if (rp->b_in + size == rp->b_size) { 3086f23ee1fSPete Zaitcev offset = rp->b_in; 3096f23ee1fSPete Zaitcev rp->b_in = 0; 3106f23ee1fSPete Zaitcev rp->b_cnt += size; 3116f23ee1fSPete Zaitcev } else { 3126f23ee1fSPete Zaitcev offset = rp->b_in; 3136f23ee1fSPete Zaitcev rp->b_in += size; 3146f23ee1fSPete Zaitcev rp->b_cnt += size; 3156f23ee1fSPete Zaitcev } 3166f23ee1fSPete Zaitcev return offset; 3176f23ee1fSPete Zaitcev } 3186f23ee1fSPete Zaitcev 3196f23ee1fSPete Zaitcev /* 3206f23ee1fSPete Zaitcev * Return a few (kilo-)bytes to the head of the buffer. 3216f23ee1fSPete Zaitcev * This is used if a DMA fetch fails. 3226f23ee1fSPete Zaitcev */ 3236f23ee1fSPete Zaitcev static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) 3246f23ee1fSPete Zaitcev { 3256f23ee1fSPete Zaitcev 3266f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3276f23ee1fSPete Zaitcev rp->b_cnt -= size; 3286f23ee1fSPete Zaitcev if (rp->b_in < size) 3296f23ee1fSPete Zaitcev rp->b_in += rp->b_size; 3306f23ee1fSPete Zaitcev rp->b_in -= size; 3316f23ee1fSPete Zaitcev } 3326f23ee1fSPete Zaitcev 3336f23ee1fSPete Zaitcev /* 3346f23ee1fSPete Zaitcev * This has to be called under both b_lock and fetch_lock, because 3356f23ee1fSPete Zaitcev * it accesses both b_cnt and b_out. 3366f23ee1fSPete Zaitcev */ 3376f23ee1fSPete Zaitcev static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size) 3386f23ee1fSPete Zaitcev { 3396f23ee1fSPete Zaitcev 3406f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3416f23ee1fSPete Zaitcev rp->b_cnt -= size; 3426f23ee1fSPete Zaitcev if ((rp->b_out += size) >= rp->b_size) 3436f23ee1fSPete Zaitcev rp->b_out -= rp->b_size; 3446f23ee1fSPete Zaitcev } 3456f23ee1fSPete Zaitcev 3466f23ee1fSPete Zaitcev static void mon_buff_area_fill(const struct mon_reader_bin *rp, 3476f23ee1fSPete Zaitcev unsigned int offset, unsigned int size) 3486f23ee1fSPete Zaitcev { 3496f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 3506f23ee1fSPete Zaitcev 3516f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 3526f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 3536f23ee1fSPete Zaitcev ep->type = '@'; 3546f23ee1fSPete Zaitcev ep->len_cap = size - PKT_SIZE; 3556f23ee1fSPete Zaitcev } 3566f23ee1fSPete Zaitcev 3576f23ee1fSPete Zaitcev static inline char mon_bin_get_setup(unsigned char *setupb, 3586f23ee1fSPete Zaitcev const struct urb *urb, char ev_type) 3596f23ee1fSPete Zaitcev { 3606f23ee1fSPete Zaitcev 36118ea5d00SAlan Stern if (!usb_endpoint_xfer_control(&urb->ep->desc) || ev_type != 'S') 3626f23ee1fSPete Zaitcev return '-'; 3636f23ee1fSPete Zaitcev 3646f23ee1fSPete Zaitcev if (urb->setup_packet == NULL) 3656f23ee1fSPete Zaitcev return 'Z'; 3666f23ee1fSPete Zaitcev 3676f23ee1fSPete Zaitcev memcpy(setupb, urb->setup_packet, SETUP_LEN); 3686f23ee1fSPete Zaitcev return 0; 3696f23ee1fSPete Zaitcev } 3706f23ee1fSPete Zaitcev 3716f23ee1fSPete Zaitcev static char mon_bin_get_data(const struct mon_reader_bin *rp, 3726f23ee1fSPete Zaitcev unsigned int offset, struct urb *urb, unsigned int length) 3736f23ee1fSPete Zaitcev { 3746f23ee1fSPete Zaitcev 375ecb658d3SPete Zaitcev if (urb->dev->bus->uses_dma && 376ecb658d3SPete Zaitcev (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) { 3776f23ee1fSPete Zaitcev mon_dmapeek_vec(rp, offset, urb->transfer_dma, length); 3786f23ee1fSPete Zaitcev return 0; 3796f23ee1fSPete Zaitcev } 3806f23ee1fSPete Zaitcev 3816f23ee1fSPete Zaitcev if (urb->transfer_buffer == NULL) 3826f23ee1fSPete Zaitcev return 'Z'; 3836f23ee1fSPete Zaitcev 3846f23ee1fSPete Zaitcev mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); 3856f23ee1fSPete Zaitcev return 0; 3866f23ee1fSPete Zaitcev } 3876f23ee1fSPete Zaitcev 3886f23ee1fSPete Zaitcev static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, 3899347d51cSAlan Stern char ev_type, int status) 3906f23ee1fSPete Zaitcev { 39130c7431dSPete Zaitcev const struct usb_endpoint_descriptor *epd = &urb->ep->desc; 3926f23ee1fSPete Zaitcev unsigned long flags; 3936f23ee1fSPete Zaitcev struct timeval ts; 3946f23ee1fSPete Zaitcev unsigned int urb_length; 3956f23ee1fSPete Zaitcev unsigned int offset; 3966f23ee1fSPete Zaitcev unsigned int length; 39730c7431dSPete Zaitcev unsigned char dir; 3986f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 3996f23ee1fSPete Zaitcev char data_tag = 0; 4006f23ee1fSPete Zaitcev 4016f23ee1fSPete Zaitcev do_gettimeofday(&ts); 4026f23ee1fSPete Zaitcev 4036f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 4046f23ee1fSPete Zaitcev 4056f23ee1fSPete Zaitcev /* 4066f23ee1fSPete Zaitcev * Find the maximum allowable length, then allocate space. 4076f23ee1fSPete Zaitcev */ 4086f23ee1fSPete Zaitcev urb_length = (ev_type == 'S') ? 4096f23ee1fSPete Zaitcev urb->transfer_buffer_length : urb->actual_length; 4106f23ee1fSPete Zaitcev length = urb_length; 4116f23ee1fSPete Zaitcev 4126f23ee1fSPete Zaitcev if (length >= rp->b_size/5) 4136f23ee1fSPete Zaitcev length = rp->b_size/5; 4146f23ee1fSPete Zaitcev 41518ea5d00SAlan Stern if (usb_urb_dir_in(urb)) { 4166f23ee1fSPete Zaitcev if (ev_type == 'S') { 4176f23ee1fSPete Zaitcev length = 0; 4186f23ee1fSPete Zaitcev data_tag = '<'; 4196f23ee1fSPete Zaitcev } 42030c7431dSPete Zaitcev /* Cannot rely on endpoint number in case of control ep.0 */ 42130c7431dSPete Zaitcev dir = USB_DIR_IN; 4226f23ee1fSPete Zaitcev } else { 4236f23ee1fSPete Zaitcev if (ev_type == 'C') { 4246f23ee1fSPete Zaitcev length = 0; 4256f23ee1fSPete Zaitcev data_tag = '>'; 4266f23ee1fSPete Zaitcev } 42730c7431dSPete Zaitcev dir = 0; 4286f23ee1fSPete Zaitcev } 4296f23ee1fSPete Zaitcev 4306f23ee1fSPete Zaitcev if (rp->mmap_active) 4316f23ee1fSPete Zaitcev offset = mon_buff_area_alloc_contiguous(rp, length + PKT_SIZE); 4326f23ee1fSPete Zaitcev else 4336f23ee1fSPete Zaitcev offset = mon_buff_area_alloc(rp, length + PKT_SIZE); 4346f23ee1fSPete Zaitcev if (offset == ~0) { 4356f23ee1fSPete Zaitcev rp->cnt_lost++; 4366f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 4376f23ee1fSPete Zaitcev return; 4386f23ee1fSPete Zaitcev } 4396f23ee1fSPete Zaitcev 4406f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 4416f23ee1fSPete Zaitcev if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; 4426f23ee1fSPete Zaitcev 4436f23ee1fSPete Zaitcev /* 4446f23ee1fSPete Zaitcev * Fill the allocated area. 4456f23ee1fSPete Zaitcev */ 4466f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 4476f23ee1fSPete Zaitcev ep->type = ev_type; 44830c7431dSPete Zaitcev ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; 44930c7431dSPete Zaitcev ep->epnum = dir | usb_endpoint_num(epd); 45018ea5d00SAlan Stern ep->devnum = urb->dev->devnum; 451ecb658d3SPete Zaitcev ep->busnum = urb->dev->bus->busnum; 4526f23ee1fSPete Zaitcev ep->id = (unsigned long) urb; 4536f23ee1fSPete Zaitcev ep->ts_sec = ts.tv_sec; 4546f23ee1fSPete Zaitcev ep->ts_usec = ts.tv_usec; 4559347d51cSAlan Stern ep->status = status; 4566f23ee1fSPete Zaitcev ep->len_urb = urb_length; 4576f23ee1fSPete Zaitcev ep->len_cap = length; 4586f23ee1fSPete Zaitcev 4596f23ee1fSPete Zaitcev ep->flag_setup = mon_bin_get_setup(ep->setup, urb, ev_type); 4606f23ee1fSPete Zaitcev if (length != 0) { 4616f23ee1fSPete Zaitcev ep->flag_data = mon_bin_get_data(rp, offset, urb, length); 4626f23ee1fSPete Zaitcev if (ep->flag_data != 0) { /* Yes, it's 0x00, not '0' */ 4636f23ee1fSPete Zaitcev ep->len_cap = 0; 4646f23ee1fSPete Zaitcev mon_buff_area_shrink(rp, length); 4656f23ee1fSPete Zaitcev } 4666f23ee1fSPete Zaitcev } else { 4676f23ee1fSPete Zaitcev ep->flag_data = data_tag; 4686f23ee1fSPete Zaitcev } 4696f23ee1fSPete Zaitcev 4706f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 4716f23ee1fSPete Zaitcev 4726f23ee1fSPete Zaitcev wake_up(&rp->b_wait); 4736f23ee1fSPete Zaitcev } 4746f23ee1fSPete Zaitcev 4756f23ee1fSPete Zaitcev static void mon_bin_submit(void *data, struct urb *urb) 4766f23ee1fSPete Zaitcev { 4776f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 4789347d51cSAlan Stern mon_bin_event(rp, urb, 'S', -EINPROGRESS); 4796f23ee1fSPete Zaitcev } 4806f23ee1fSPete Zaitcev 4819347d51cSAlan Stern static void mon_bin_complete(void *data, struct urb *urb, int status) 4826f23ee1fSPete Zaitcev { 4836f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 4849347d51cSAlan Stern mon_bin_event(rp, urb, 'C', status); 4856f23ee1fSPete Zaitcev } 4866f23ee1fSPete Zaitcev 4876f23ee1fSPete Zaitcev static void mon_bin_error(void *data, struct urb *urb, int error) 4886f23ee1fSPete Zaitcev { 4896f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 4906f23ee1fSPete Zaitcev unsigned long flags; 4916f23ee1fSPete Zaitcev unsigned int offset; 4926f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 4936f23ee1fSPete Zaitcev 4946f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 4956f23ee1fSPete Zaitcev 4966f23ee1fSPete Zaitcev offset = mon_buff_area_alloc(rp, PKT_SIZE); 4976f23ee1fSPete Zaitcev if (offset == ~0) { 4986f23ee1fSPete Zaitcev /* Not incrementing cnt_lost. Just because. */ 4996f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 5006f23ee1fSPete Zaitcev return; 5016f23ee1fSPete Zaitcev } 5026f23ee1fSPete Zaitcev 5036f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 5046f23ee1fSPete Zaitcev 5056f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 5066f23ee1fSPete Zaitcev ep->type = 'E'; 50730c7431dSPete Zaitcev ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; 50830c7431dSPete Zaitcev ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; 50930c7431dSPete Zaitcev ep->epnum |= usb_endpoint_num(&urb->ep->desc); 51018ea5d00SAlan Stern ep->devnum = urb->dev->devnum; 511ecb658d3SPete Zaitcev ep->busnum = urb->dev->bus->busnum; 5126f23ee1fSPete Zaitcev ep->id = (unsigned long) urb; 5136f23ee1fSPete Zaitcev ep->status = error; 5146f23ee1fSPete Zaitcev 5156f23ee1fSPete Zaitcev ep->flag_setup = '-'; 5166f23ee1fSPete Zaitcev ep->flag_data = 'E'; 5176f23ee1fSPete Zaitcev 5186f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 5196f23ee1fSPete Zaitcev 5206f23ee1fSPete Zaitcev wake_up(&rp->b_wait); 5216f23ee1fSPete Zaitcev } 5226f23ee1fSPete Zaitcev 5236f23ee1fSPete Zaitcev static int mon_bin_open(struct inode *inode, struct file *file) 5246f23ee1fSPete Zaitcev { 5256f23ee1fSPete Zaitcev struct mon_bus *mbus; 5266f23ee1fSPete Zaitcev struct mon_reader_bin *rp; 5276f23ee1fSPete Zaitcev size_t size; 5286f23ee1fSPete Zaitcev int rc; 5296f23ee1fSPete Zaitcev 5306f23ee1fSPete Zaitcev mutex_lock(&mon_lock); 5316f23ee1fSPete Zaitcev if ((mbus = mon_bus_lookup(iminor(inode))) == NULL) { 5326f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 5336f23ee1fSPete Zaitcev return -ENODEV; 5346f23ee1fSPete Zaitcev } 535ecb658d3SPete Zaitcev if (mbus != &mon_bus0 && mbus->u_bus == NULL) { 5366f23ee1fSPete Zaitcev printk(KERN_ERR TAG ": consistency error on open\n"); 5376f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 5386f23ee1fSPete Zaitcev return -ENODEV; 5396f23ee1fSPete Zaitcev } 5406f23ee1fSPete Zaitcev 5416f23ee1fSPete Zaitcev rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); 5426f23ee1fSPete Zaitcev if (rp == NULL) { 5436f23ee1fSPete Zaitcev rc = -ENOMEM; 5446f23ee1fSPete Zaitcev goto err_alloc; 5456f23ee1fSPete Zaitcev } 5466f23ee1fSPete Zaitcev spin_lock_init(&rp->b_lock); 5476f23ee1fSPete Zaitcev init_waitqueue_head(&rp->b_wait); 5486f23ee1fSPete Zaitcev mutex_init(&rp->fetch_lock); 5496f23ee1fSPete Zaitcev 5506f23ee1fSPete Zaitcev rp->b_size = BUFF_DFL; 5516f23ee1fSPete Zaitcev 5526f23ee1fSPete Zaitcev size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); 5536f23ee1fSPete Zaitcev if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { 5546f23ee1fSPete Zaitcev rc = -ENOMEM; 5556f23ee1fSPete Zaitcev goto err_allocvec; 5566f23ee1fSPete Zaitcev } 5576f23ee1fSPete Zaitcev 5586f23ee1fSPete Zaitcev if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) 5596f23ee1fSPete Zaitcev goto err_allocbuff; 5606f23ee1fSPete Zaitcev 5616f23ee1fSPete Zaitcev rp->r.m_bus = mbus; 5626f23ee1fSPete Zaitcev rp->r.r_data = rp; 5636f23ee1fSPete Zaitcev rp->r.rnf_submit = mon_bin_submit; 5646f23ee1fSPete Zaitcev rp->r.rnf_error = mon_bin_error; 5656f23ee1fSPete Zaitcev rp->r.rnf_complete = mon_bin_complete; 5666f23ee1fSPete Zaitcev 5676f23ee1fSPete Zaitcev mon_reader_add(mbus, &rp->r); 5686f23ee1fSPete Zaitcev 5696f23ee1fSPete Zaitcev file->private_data = rp; 5706f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 5716f23ee1fSPete Zaitcev return 0; 5726f23ee1fSPete Zaitcev 5736f23ee1fSPete Zaitcev err_allocbuff: 5746f23ee1fSPete Zaitcev kfree(rp->b_vec); 5756f23ee1fSPete Zaitcev err_allocvec: 5766f23ee1fSPete Zaitcev kfree(rp); 5776f23ee1fSPete Zaitcev err_alloc: 5786f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 5796f23ee1fSPete Zaitcev return rc; 5806f23ee1fSPete Zaitcev } 5816f23ee1fSPete Zaitcev 5826f23ee1fSPete Zaitcev /* 5836f23ee1fSPete Zaitcev * Extract an event from buffer and copy it to user space. 5846f23ee1fSPete Zaitcev * Wait if there is no event ready. 5856f23ee1fSPete Zaitcev * Returns zero or error. 5866f23ee1fSPete Zaitcev */ 5876f23ee1fSPete Zaitcev static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp, 5886f23ee1fSPete Zaitcev struct mon_bin_hdr __user *hdr, void __user *data, unsigned int nbytes) 5896f23ee1fSPete Zaitcev { 5906f23ee1fSPete Zaitcev unsigned long flags; 5916f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 5926f23ee1fSPete Zaitcev size_t step_len; 5936f23ee1fSPete Zaitcev unsigned int offset; 5946f23ee1fSPete Zaitcev int rc; 5956f23ee1fSPete Zaitcev 5966f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 5976f23ee1fSPete Zaitcev 5986f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 5996f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6006f23ee1fSPete Zaitcev return rc; 6016f23ee1fSPete Zaitcev } 6026f23ee1fSPete Zaitcev 6036f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 6046f23ee1fSPete Zaitcev 6056f23ee1fSPete Zaitcev if (copy_to_user(hdr, ep, sizeof(struct mon_bin_hdr))) { 6066f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6076f23ee1fSPete Zaitcev return -EFAULT; 6086f23ee1fSPete Zaitcev } 6096f23ee1fSPete Zaitcev 6106f23ee1fSPete Zaitcev step_len = min(ep->len_cap, nbytes); 6116f23ee1fSPete Zaitcev if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; 6126f23ee1fSPete Zaitcev 6136f23ee1fSPete Zaitcev if (copy_from_buf(rp, offset, data, step_len)) { 6146f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6156f23ee1fSPete Zaitcev return -EFAULT; 6166f23ee1fSPete Zaitcev } 6176f23ee1fSPete Zaitcev 6186f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 6196f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 6206f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 6216f23ee1fSPete Zaitcev rp->b_read = 0; 6226f23ee1fSPete Zaitcev 6236f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6246f23ee1fSPete Zaitcev return 0; 6256f23ee1fSPete Zaitcev } 6266f23ee1fSPete Zaitcev 6276f23ee1fSPete Zaitcev static int mon_bin_release(struct inode *inode, struct file *file) 6286f23ee1fSPete Zaitcev { 6296f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 6306f23ee1fSPete Zaitcev struct mon_bus* mbus = rp->r.m_bus; 6316f23ee1fSPete Zaitcev 6326f23ee1fSPete Zaitcev mutex_lock(&mon_lock); 6336f23ee1fSPete Zaitcev 6346f23ee1fSPete Zaitcev if (mbus->nreaders <= 0) { 6356f23ee1fSPete Zaitcev printk(KERN_ERR TAG ": consistency error on close\n"); 6366f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6376f23ee1fSPete Zaitcev return 0; 6386f23ee1fSPete Zaitcev } 6396f23ee1fSPete Zaitcev mon_reader_del(mbus, &rp->r); 6406f23ee1fSPete Zaitcev 6416f23ee1fSPete Zaitcev mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); 6426f23ee1fSPete Zaitcev kfree(rp->b_vec); 6436f23ee1fSPete Zaitcev kfree(rp); 6446f23ee1fSPete Zaitcev 6456f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6466f23ee1fSPete Zaitcev return 0; 6476f23ee1fSPete Zaitcev } 6486f23ee1fSPete Zaitcev 6496f23ee1fSPete Zaitcev static ssize_t mon_bin_read(struct file *file, char __user *buf, 6506f23ee1fSPete Zaitcev size_t nbytes, loff_t *ppos) 6516f23ee1fSPete Zaitcev { 6526f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 6536f23ee1fSPete Zaitcev unsigned long flags; 6546f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 6556f23ee1fSPete Zaitcev unsigned int offset; 6566f23ee1fSPete Zaitcev size_t step_len; 6576f23ee1fSPete Zaitcev char *ptr; 6586f23ee1fSPete Zaitcev ssize_t done = 0; 6596f23ee1fSPete Zaitcev int rc; 6606f23ee1fSPete Zaitcev 6616f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 6626f23ee1fSPete Zaitcev 6636f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 6646f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6656f23ee1fSPete Zaitcev return rc; 6666f23ee1fSPete Zaitcev } 6676f23ee1fSPete Zaitcev 6686f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 6696f23ee1fSPete Zaitcev 6706f23ee1fSPete Zaitcev if (rp->b_read < sizeof(struct mon_bin_hdr)) { 6716f23ee1fSPete Zaitcev step_len = min(nbytes, sizeof(struct mon_bin_hdr) - rp->b_read); 6726f23ee1fSPete Zaitcev ptr = ((char *)ep) + rp->b_read; 6736f23ee1fSPete Zaitcev if (step_len && copy_to_user(buf, ptr, step_len)) { 6746f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6756f23ee1fSPete Zaitcev return -EFAULT; 6766f23ee1fSPete Zaitcev } 6776f23ee1fSPete Zaitcev nbytes -= step_len; 6786f23ee1fSPete Zaitcev buf += step_len; 6796f23ee1fSPete Zaitcev rp->b_read += step_len; 6806f23ee1fSPete Zaitcev done += step_len; 6816f23ee1fSPete Zaitcev } 6826f23ee1fSPete Zaitcev 6836f23ee1fSPete Zaitcev if (rp->b_read >= sizeof(struct mon_bin_hdr)) { 6846f23ee1fSPete Zaitcev step_len = min(nbytes, (size_t)ep->len_cap); 6856f23ee1fSPete Zaitcev offset = rp->b_out + PKT_SIZE; 6866f23ee1fSPete Zaitcev offset += rp->b_read - sizeof(struct mon_bin_hdr); 6876f23ee1fSPete Zaitcev if (offset >= rp->b_size) 6886f23ee1fSPete Zaitcev offset -= rp->b_size; 6896f23ee1fSPete Zaitcev if (copy_from_buf(rp, offset, buf, step_len)) { 6906f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 6916f23ee1fSPete Zaitcev return -EFAULT; 6926f23ee1fSPete Zaitcev } 6936f23ee1fSPete Zaitcev nbytes -= step_len; 6946f23ee1fSPete Zaitcev buf += step_len; 6956f23ee1fSPete Zaitcev rp->b_read += step_len; 6966f23ee1fSPete Zaitcev done += step_len; 6976f23ee1fSPete Zaitcev } 6986f23ee1fSPete Zaitcev 6996f23ee1fSPete Zaitcev /* 7006f23ee1fSPete Zaitcev * Check if whole packet was read, and if so, jump to the next one. 7016f23ee1fSPete Zaitcev */ 7026f23ee1fSPete Zaitcev if (rp->b_read >= sizeof(struct mon_bin_hdr) + ep->len_cap) { 7036f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 7046f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 7056f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 7066f23ee1fSPete Zaitcev rp->b_read = 0; 7076f23ee1fSPete Zaitcev } 7086f23ee1fSPete Zaitcev 7096f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7106f23ee1fSPete Zaitcev return done; 7116f23ee1fSPete Zaitcev } 7126f23ee1fSPete Zaitcev 7136f23ee1fSPete Zaitcev /* 7146f23ee1fSPete Zaitcev * Remove at most nevents from chunked buffer. 7156f23ee1fSPete Zaitcev * Returns the number of removed events. 7166f23ee1fSPete Zaitcev */ 7176f23ee1fSPete Zaitcev static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) 7186f23ee1fSPete Zaitcev { 7196f23ee1fSPete Zaitcev unsigned long flags; 7206f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 7216f23ee1fSPete Zaitcev int i; 7226f23ee1fSPete Zaitcev 7236f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 7246f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 7256f23ee1fSPete Zaitcev for (i = 0; i < nevents; ++i) { 7266f23ee1fSPete Zaitcev if (MON_RING_EMPTY(rp)) 7276f23ee1fSPete Zaitcev break; 7286f23ee1fSPete Zaitcev 7296f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 7306f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 7316f23ee1fSPete Zaitcev } 7326f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 7336f23ee1fSPete Zaitcev rp->b_read = 0; 7346f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7356f23ee1fSPete Zaitcev return i; 7366f23ee1fSPete Zaitcev } 7376f23ee1fSPete Zaitcev 7386f23ee1fSPete Zaitcev /* 7396f23ee1fSPete Zaitcev * Fetch at most max event offsets into the buffer and put them into vec. 7406f23ee1fSPete Zaitcev * The events are usually freed later with mon_bin_flush. 7416f23ee1fSPete Zaitcev * Return the effective number of events fetched. 7426f23ee1fSPete Zaitcev */ 7436f23ee1fSPete Zaitcev static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, 7446f23ee1fSPete Zaitcev u32 __user *vec, unsigned int max) 7456f23ee1fSPete Zaitcev { 7466f23ee1fSPete Zaitcev unsigned int cur_out; 7476f23ee1fSPete Zaitcev unsigned int bytes, avail; 7486f23ee1fSPete Zaitcev unsigned int size; 7496f23ee1fSPete Zaitcev unsigned int nevents; 7506f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 7516f23ee1fSPete Zaitcev unsigned long flags; 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 spin_lock_irqsave(&rp->b_lock, flags); 7626f23ee1fSPete Zaitcev avail = rp->b_cnt; 7636f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 7646f23ee1fSPete Zaitcev 7656f23ee1fSPete Zaitcev cur_out = rp->b_out; 7666f23ee1fSPete Zaitcev nevents = 0; 7676f23ee1fSPete Zaitcev bytes = 0; 7686f23ee1fSPete Zaitcev while (bytes < avail) { 7696f23ee1fSPete Zaitcev if (nevents >= max) 7706f23ee1fSPete Zaitcev break; 7716f23ee1fSPete Zaitcev 7726f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, cur_out); 7736f23ee1fSPete Zaitcev if (put_user(cur_out, &vec[nevents])) { 7746f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7756f23ee1fSPete Zaitcev return -EFAULT; 7766f23ee1fSPete Zaitcev } 7776f23ee1fSPete Zaitcev 7786f23ee1fSPete Zaitcev nevents++; 7796f23ee1fSPete Zaitcev size = ep->len_cap + PKT_SIZE; 7806f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 7816f23ee1fSPete Zaitcev if ((cur_out += size) >= rp->b_size) 7826f23ee1fSPete Zaitcev cur_out -= rp->b_size; 7836f23ee1fSPete Zaitcev bytes += size; 7846f23ee1fSPete Zaitcev } 7856f23ee1fSPete Zaitcev 7866f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7876f23ee1fSPete Zaitcev return nevents; 7886f23ee1fSPete Zaitcev } 7896f23ee1fSPete Zaitcev 7906f23ee1fSPete Zaitcev /* 7916f23ee1fSPete Zaitcev * Count events. This is almost the same as the above mon_bin_fetch, 7926f23ee1fSPete Zaitcev * only we do not store offsets into user vector, and we have no limit. 7936f23ee1fSPete Zaitcev */ 7946f23ee1fSPete Zaitcev static int mon_bin_queued(struct mon_reader_bin *rp) 7956f23ee1fSPete Zaitcev { 7966f23ee1fSPete Zaitcev unsigned int cur_out; 7976f23ee1fSPete Zaitcev unsigned int bytes, avail; 7986f23ee1fSPete Zaitcev unsigned int size; 7996f23ee1fSPete Zaitcev unsigned int nevents; 8006f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 8016f23ee1fSPete Zaitcev unsigned long flags; 8026f23ee1fSPete Zaitcev 8036f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 8046f23ee1fSPete Zaitcev 8056f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8066f23ee1fSPete Zaitcev avail = rp->b_cnt; 8076f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8086f23ee1fSPete Zaitcev 8096f23ee1fSPete Zaitcev cur_out = rp->b_out; 8106f23ee1fSPete Zaitcev nevents = 0; 8116f23ee1fSPete Zaitcev bytes = 0; 8126f23ee1fSPete Zaitcev while (bytes < avail) { 8136f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, cur_out); 8146f23ee1fSPete Zaitcev 8156f23ee1fSPete Zaitcev nevents++; 8166f23ee1fSPete Zaitcev size = ep->len_cap + PKT_SIZE; 8176f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 8186f23ee1fSPete Zaitcev if ((cur_out += size) >= rp->b_size) 8196f23ee1fSPete Zaitcev cur_out -= rp->b_size; 8206f23ee1fSPete Zaitcev bytes += size; 8216f23ee1fSPete Zaitcev } 8226f23ee1fSPete Zaitcev 8236f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8246f23ee1fSPete Zaitcev return nevents; 8256f23ee1fSPete Zaitcev } 8266f23ee1fSPete Zaitcev 8276f23ee1fSPete Zaitcev /* 8286f23ee1fSPete Zaitcev */ 8296f23ee1fSPete Zaitcev static int mon_bin_ioctl(struct inode *inode, struct file *file, 8306f23ee1fSPete Zaitcev unsigned int cmd, unsigned long arg) 8316f23ee1fSPete Zaitcev { 8326f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 8336f23ee1fSPete Zaitcev // struct mon_bus* mbus = rp->r.m_bus; 8346f23ee1fSPete Zaitcev int ret = 0; 8356f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 8366f23ee1fSPete Zaitcev unsigned long flags; 8376f23ee1fSPete Zaitcev 8386f23ee1fSPete Zaitcev switch (cmd) { 8396f23ee1fSPete Zaitcev 8406f23ee1fSPete Zaitcev case MON_IOCQ_URB_LEN: 8416f23ee1fSPete Zaitcev /* 8426f23ee1fSPete Zaitcev * N.B. This only returns the size of data, without the header. 8436f23ee1fSPete Zaitcev */ 8446f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8456f23ee1fSPete Zaitcev if (!MON_RING_EMPTY(rp)) { 8466f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 8476f23ee1fSPete Zaitcev ret = ep->len_cap; 8486f23ee1fSPete Zaitcev } 8496f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8506f23ee1fSPete Zaitcev break; 8516f23ee1fSPete Zaitcev 8526f23ee1fSPete Zaitcev case MON_IOCQ_RING_SIZE: 8536f23ee1fSPete Zaitcev ret = rp->b_size; 8546f23ee1fSPete Zaitcev break; 8556f23ee1fSPete Zaitcev 8566f23ee1fSPete Zaitcev case MON_IOCT_RING_SIZE: 8576f23ee1fSPete Zaitcev /* 8586f23ee1fSPete Zaitcev * Changing the buffer size will flush it's contents; the new 8596f23ee1fSPete Zaitcev * buffer is allocated before releasing the old one to be sure 8606f23ee1fSPete Zaitcev * the device will stay functional also in case of memory 8616f23ee1fSPete Zaitcev * pressure. 8626f23ee1fSPete Zaitcev */ 8636f23ee1fSPete Zaitcev { 8646f23ee1fSPete Zaitcev int size; 8656f23ee1fSPete Zaitcev struct mon_pgmap *vec; 8666f23ee1fSPete Zaitcev 8676f23ee1fSPete Zaitcev if (arg < BUFF_MIN || arg > BUFF_MAX) 8686f23ee1fSPete Zaitcev return -EINVAL; 8696f23ee1fSPete Zaitcev 8706f23ee1fSPete Zaitcev size = CHUNK_ALIGN(arg); 8716f23ee1fSPete Zaitcev if ((vec = kzalloc(sizeof(struct mon_pgmap) * (size/CHUNK_SIZE), 8726f23ee1fSPete Zaitcev GFP_KERNEL)) == NULL) { 8736f23ee1fSPete Zaitcev ret = -ENOMEM; 8746f23ee1fSPete Zaitcev break; 8756f23ee1fSPete Zaitcev } 8766f23ee1fSPete Zaitcev 8776f23ee1fSPete Zaitcev ret = mon_alloc_buff(vec, size/CHUNK_SIZE); 8786f23ee1fSPete Zaitcev if (ret < 0) { 8796f23ee1fSPete Zaitcev kfree(vec); 8806f23ee1fSPete Zaitcev break; 8816f23ee1fSPete Zaitcev } 8826f23ee1fSPete Zaitcev 8836f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 8846f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8856f23ee1fSPete Zaitcev mon_free_buff(rp->b_vec, size/CHUNK_SIZE); 8866f23ee1fSPete Zaitcev kfree(rp->b_vec); 8876f23ee1fSPete Zaitcev rp->b_vec = vec; 8886f23ee1fSPete Zaitcev rp->b_size = size; 8896f23ee1fSPete Zaitcev rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; 8906f23ee1fSPete Zaitcev rp->cnt_lost = 0; 8916f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8926f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8936f23ee1fSPete Zaitcev } 8946f23ee1fSPete Zaitcev break; 8956f23ee1fSPete Zaitcev 8966f23ee1fSPete Zaitcev case MON_IOCH_MFLUSH: 8976f23ee1fSPete Zaitcev ret = mon_bin_flush(rp, arg); 8986f23ee1fSPete Zaitcev break; 8996f23ee1fSPete Zaitcev 9006f23ee1fSPete Zaitcev case MON_IOCX_GET: 9016f23ee1fSPete Zaitcev { 9026f23ee1fSPete Zaitcev struct mon_bin_get getb; 9036f23ee1fSPete Zaitcev 9046f23ee1fSPete Zaitcev if (copy_from_user(&getb, (void __user *)arg, 9056f23ee1fSPete Zaitcev sizeof(struct mon_bin_get))) 9066f23ee1fSPete Zaitcev return -EFAULT; 9076f23ee1fSPete Zaitcev 9086f23ee1fSPete Zaitcev if (getb.alloc > 0x10000000) /* Want to cast to u32 */ 9096f23ee1fSPete Zaitcev return -EINVAL; 9106f23ee1fSPete Zaitcev ret = mon_bin_get_event(file, rp, 9116f23ee1fSPete Zaitcev getb.hdr, getb.data, (unsigned int)getb.alloc); 9126f23ee1fSPete Zaitcev } 9136f23ee1fSPete Zaitcev break; 9146f23ee1fSPete Zaitcev 9156f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 9166f23ee1fSPete Zaitcev case MON_IOCX_GET32: { 9176f23ee1fSPete Zaitcev struct mon_bin_get32 getb; 9186f23ee1fSPete Zaitcev 9196f23ee1fSPete Zaitcev if (copy_from_user(&getb, (void __user *)arg, 9206f23ee1fSPete Zaitcev sizeof(struct mon_bin_get32))) 9216f23ee1fSPete Zaitcev return -EFAULT; 9226f23ee1fSPete Zaitcev 9236f23ee1fSPete Zaitcev ret = mon_bin_get_event(file, rp, 9246f23ee1fSPete Zaitcev compat_ptr(getb.hdr32), compat_ptr(getb.data32), 9256f23ee1fSPete Zaitcev getb.alloc32); 9266f23ee1fSPete Zaitcev } 9276f23ee1fSPete Zaitcev break; 9286f23ee1fSPete Zaitcev #endif 9296f23ee1fSPete Zaitcev 9306f23ee1fSPete Zaitcev case MON_IOCX_MFETCH: 9316f23ee1fSPete Zaitcev { 9326f23ee1fSPete Zaitcev struct mon_bin_mfetch mfetch; 9336f23ee1fSPete Zaitcev struct mon_bin_mfetch __user *uptr; 9346f23ee1fSPete Zaitcev 9356f23ee1fSPete Zaitcev uptr = (struct mon_bin_mfetch __user *)arg; 9366f23ee1fSPete Zaitcev 9376f23ee1fSPete Zaitcev if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) 9386f23ee1fSPete Zaitcev return -EFAULT; 9396f23ee1fSPete Zaitcev 9406f23ee1fSPete Zaitcev if (mfetch.nflush) { 9416f23ee1fSPete Zaitcev ret = mon_bin_flush(rp, mfetch.nflush); 9426f23ee1fSPete Zaitcev if (ret < 0) 9436f23ee1fSPete Zaitcev return ret; 9446f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nflush)) 9456f23ee1fSPete Zaitcev return -EFAULT; 9466f23ee1fSPete Zaitcev } 9476f23ee1fSPete Zaitcev ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); 9486f23ee1fSPete Zaitcev if (ret < 0) 9496f23ee1fSPete Zaitcev return ret; 9506f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nfetch)) 9516f23ee1fSPete Zaitcev return -EFAULT; 9526f23ee1fSPete Zaitcev ret = 0; 9536f23ee1fSPete Zaitcev } 9546f23ee1fSPete Zaitcev break; 9556f23ee1fSPete Zaitcev 9566f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 9576f23ee1fSPete Zaitcev case MON_IOCX_MFETCH32: 9586f23ee1fSPete Zaitcev { 9596f23ee1fSPete Zaitcev struct mon_bin_mfetch32 mfetch; 9606f23ee1fSPete Zaitcev struct mon_bin_mfetch32 __user *uptr; 9616f23ee1fSPete Zaitcev 9626f23ee1fSPete Zaitcev uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); 9636f23ee1fSPete Zaitcev 9646f23ee1fSPete Zaitcev if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) 9656f23ee1fSPete Zaitcev return -EFAULT; 9666f23ee1fSPete Zaitcev 9676f23ee1fSPete Zaitcev if (mfetch.nflush32) { 9686f23ee1fSPete Zaitcev ret = mon_bin_flush(rp, mfetch.nflush32); 9696f23ee1fSPete Zaitcev if (ret < 0) 9706f23ee1fSPete Zaitcev return ret; 9716f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nflush32)) 9726f23ee1fSPete Zaitcev return -EFAULT; 9736f23ee1fSPete Zaitcev } 9746f23ee1fSPete Zaitcev ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), 9756f23ee1fSPete Zaitcev mfetch.nfetch32); 9766f23ee1fSPete Zaitcev if (ret < 0) 9776f23ee1fSPete Zaitcev return ret; 9786f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nfetch32)) 9796f23ee1fSPete Zaitcev return -EFAULT; 9806f23ee1fSPete Zaitcev ret = 0; 9816f23ee1fSPete Zaitcev } 9826f23ee1fSPete Zaitcev break; 9836f23ee1fSPete Zaitcev #endif 9846f23ee1fSPete Zaitcev 9856f23ee1fSPete Zaitcev case MON_IOCG_STATS: { 9866f23ee1fSPete Zaitcev struct mon_bin_stats __user *sp; 9876f23ee1fSPete Zaitcev unsigned int nevents; 9886f23ee1fSPete Zaitcev unsigned int ndropped; 9896f23ee1fSPete Zaitcev 9906f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 9916f23ee1fSPete Zaitcev ndropped = rp->cnt_lost; 9926f23ee1fSPete Zaitcev rp->cnt_lost = 0; 9936f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 9946f23ee1fSPete Zaitcev nevents = mon_bin_queued(rp); 9956f23ee1fSPete Zaitcev 9966f23ee1fSPete Zaitcev sp = (struct mon_bin_stats __user *)arg; 9976f23ee1fSPete Zaitcev if (put_user(rp->cnt_lost, &sp->dropped)) 9986f23ee1fSPete Zaitcev return -EFAULT; 9996f23ee1fSPete Zaitcev if (put_user(nevents, &sp->queued)) 10006f23ee1fSPete Zaitcev return -EFAULT; 10016f23ee1fSPete Zaitcev 10026f23ee1fSPete Zaitcev } 10036f23ee1fSPete Zaitcev break; 10046f23ee1fSPete Zaitcev 10056f23ee1fSPete Zaitcev default: 10066f23ee1fSPete Zaitcev return -ENOTTY; 10076f23ee1fSPete Zaitcev } 10086f23ee1fSPete Zaitcev 10096f23ee1fSPete Zaitcev return ret; 10106f23ee1fSPete Zaitcev } 10116f23ee1fSPete Zaitcev 10126f23ee1fSPete Zaitcev static unsigned int 10136f23ee1fSPete Zaitcev mon_bin_poll(struct file *file, struct poll_table_struct *wait) 10146f23ee1fSPete Zaitcev { 10156f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 10166f23ee1fSPete Zaitcev unsigned int mask = 0; 10176f23ee1fSPete Zaitcev unsigned long flags; 10186f23ee1fSPete Zaitcev 10196f23ee1fSPete Zaitcev if (file->f_mode & FMODE_READ) 10206f23ee1fSPete Zaitcev poll_wait(file, &rp->b_wait, wait); 10216f23ee1fSPete Zaitcev 10226f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 10236f23ee1fSPete Zaitcev if (!MON_RING_EMPTY(rp)) 10246f23ee1fSPete Zaitcev mask |= POLLIN | POLLRDNORM; /* readable */ 10256f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 10266f23ee1fSPete Zaitcev return mask; 10276f23ee1fSPete Zaitcev } 10286f23ee1fSPete Zaitcev 10296f23ee1fSPete Zaitcev /* 10306f23ee1fSPete Zaitcev * open and close: just keep track of how many times the device is 10316f23ee1fSPete Zaitcev * mapped, to use the proper memory allocation function. 10326f23ee1fSPete Zaitcev */ 10336f23ee1fSPete Zaitcev static void mon_bin_vma_open(struct vm_area_struct *vma) 10346f23ee1fSPete Zaitcev { 10356f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 10366f23ee1fSPete Zaitcev rp->mmap_active++; 10376f23ee1fSPete Zaitcev } 10386f23ee1fSPete Zaitcev 10396f23ee1fSPete Zaitcev static void mon_bin_vma_close(struct vm_area_struct *vma) 10406f23ee1fSPete Zaitcev { 10416f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 10426f23ee1fSPete Zaitcev rp->mmap_active--; 10436f23ee1fSPete Zaitcev } 10446f23ee1fSPete Zaitcev 10456f23ee1fSPete Zaitcev /* 10466f23ee1fSPete Zaitcev * Map ring pages to user space. 10476f23ee1fSPete Zaitcev */ 1048041509dbSNick Piggin static int mon_bin_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 10496f23ee1fSPete Zaitcev { 10506f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 10516f23ee1fSPete Zaitcev unsigned long offset, chunk_idx; 10526f23ee1fSPete Zaitcev struct page *pageptr; 10536f23ee1fSPete Zaitcev 1054041509dbSNick Piggin offset = vmf->pgoff << PAGE_SHIFT; 10556f23ee1fSPete Zaitcev if (offset >= rp->b_size) 1056041509dbSNick Piggin return VM_FAULT_SIGBUS; 10576f23ee1fSPete Zaitcev chunk_idx = offset / CHUNK_SIZE; 10586f23ee1fSPete Zaitcev pageptr = rp->b_vec[chunk_idx].pg; 10596f23ee1fSPete Zaitcev get_page(pageptr); 1060041509dbSNick Piggin vmf->page = pageptr; 1061041509dbSNick Piggin return 0; 10626f23ee1fSPete Zaitcev } 10636f23ee1fSPete Zaitcev 1064454459b0SPete Zaitcev static struct vm_operations_struct mon_bin_vm_ops = { 10656f23ee1fSPete Zaitcev .open = mon_bin_vma_open, 10666f23ee1fSPete Zaitcev .close = mon_bin_vma_close, 1067041509dbSNick Piggin .fault = mon_bin_vma_fault, 10686f23ee1fSPete Zaitcev }; 10696f23ee1fSPete Zaitcev 1070454459b0SPete Zaitcev static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma) 10716f23ee1fSPete Zaitcev { 1072041509dbSNick Piggin /* don't do anything here: "fault" will set up page table entries */ 10736f23ee1fSPete Zaitcev vma->vm_ops = &mon_bin_vm_ops; 10746f23ee1fSPete Zaitcev vma->vm_flags |= VM_RESERVED; 10756f23ee1fSPete Zaitcev vma->vm_private_data = filp->private_data; 10766f23ee1fSPete Zaitcev mon_bin_vma_open(vma); 10776f23ee1fSPete Zaitcev return 0; 10786f23ee1fSPete Zaitcev } 10796f23ee1fSPete Zaitcev 10800b3f5fe6SJan Engelhardt static const struct file_operations mon_fops_binary = { 10816f23ee1fSPete Zaitcev .owner = THIS_MODULE, 10826f23ee1fSPete Zaitcev .open = mon_bin_open, 10836f23ee1fSPete Zaitcev .llseek = no_llseek, 10846f23ee1fSPete Zaitcev .read = mon_bin_read, 10856f23ee1fSPete Zaitcev /* .write = mon_text_write, */ 10866f23ee1fSPete Zaitcev .poll = mon_bin_poll, 10876f23ee1fSPete Zaitcev .ioctl = mon_bin_ioctl, 10886f23ee1fSPete Zaitcev .release = mon_bin_release, 1089454459b0SPete Zaitcev .mmap = mon_bin_mmap, 10906f23ee1fSPete Zaitcev }; 10916f23ee1fSPete Zaitcev 10926f23ee1fSPete Zaitcev static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) 10936f23ee1fSPete Zaitcev { 10946f23ee1fSPete Zaitcev DECLARE_WAITQUEUE(waita, current); 10956f23ee1fSPete Zaitcev unsigned long flags; 10966f23ee1fSPete Zaitcev 10976f23ee1fSPete Zaitcev add_wait_queue(&rp->b_wait, &waita); 10986f23ee1fSPete Zaitcev set_current_state(TASK_INTERRUPTIBLE); 10996f23ee1fSPete Zaitcev 11006f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 11016f23ee1fSPete Zaitcev while (MON_RING_EMPTY(rp)) { 11026f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 11036f23ee1fSPete Zaitcev 11046f23ee1fSPete Zaitcev if (file->f_flags & O_NONBLOCK) { 11056f23ee1fSPete Zaitcev set_current_state(TASK_RUNNING); 11066f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 11076f23ee1fSPete Zaitcev return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ 11086f23ee1fSPete Zaitcev } 11096f23ee1fSPete Zaitcev schedule(); 11106f23ee1fSPete Zaitcev if (signal_pending(current)) { 11116f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 11126f23ee1fSPete Zaitcev return -EINTR; 11136f23ee1fSPete Zaitcev } 11146f23ee1fSPete Zaitcev set_current_state(TASK_INTERRUPTIBLE); 11156f23ee1fSPete Zaitcev 11166f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 11176f23ee1fSPete Zaitcev } 11186f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 11196f23ee1fSPete Zaitcev 11206f23ee1fSPete Zaitcev set_current_state(TASK_RUNNING); 11216f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 11226f23ee1fSPete Zaitcev return 0; 11236f23ee1fSPete Zaitcev } 11246f23ee1fSPete Zaitcev 11256f23ee1fSPete Zaitcev static int mon_alloc_buff(struct mon_pgmap *map, int npages) 11266f23ee1fSPete Zaitcev { 11276f23ee1fSPete Zaitcev int n; 11286f23ee1fSPete Zaitcev unsigned long vaddr; 11296f23ee1fSPete Zaitcev 11306f23ee1fSPete Zaitcev for (n = 0; n < npages; n++) { 11316f23ee1fSPete Zaitcev vaddr = get_zeroed_page(GFP_KERNEL); 11326f23ee1fSPete Zaitcev if (vaddr == 0) { 11336f23ee1fSPete Zaitcev while (n-- != 0) 11346f23ee1fSPete Zaitcev free_page((unsigned long) map[n].ptr); 11356f23ee1fSPete Zaitcev return -ENOMEM; 11366f23ee1fSPete Zaitcev } 11376f23ee1fSPete Zaitcev map[n].ptr = (unsigned char *) vaddr; 11386f23ee1fSPete Zaitcev map[n].pg = virt_to_page(vaddr); 11396f23ee1fSPete Zaitcev } 11406f23ee1fSPete Zaitcev return 0; 11416f23ee1fSPete Zaitcev } 11426f23ee1fSPete Zaitcev 11436f23ee1fSPete Zaitcev static void mon_free_buff(struct mon_pgmap *map, int npages) 11446f23ee1fSPete Zaitcev { 11456f23ee1fSPete Zaitcev int n; 11466f23ee1fSPete Zaitcev 11476f23ee1fSPete Zaitcev for (n = 0; n < npages; n++) 11486f23ee1fSPete Zaitcev free_page((unsigned long) map[n].ptr); 11496f23ee1fSPete Zaitcev } 11506f23ee1fSPete Zaitcev 1151ce7cd137SPete Zaitcev int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) 1152ce7cd137SPete Zaitcev { 1153ce7cd137SPete Zaitcev struct device *dev; 1154ce7cd137SPete Zaitcev unsigned minor = ubus? ubus->busnum: 0; 1155ce7cd137SPete Zaitcev 1156ce7cd137SPete Zaitcev if (minor >= MON_BIN_MAX_MINOR) 1157ce7cd137SPete Zaitcev return 0; 1158ce7cd137SPete Zaitcev 1159ce7cd137SPete Zaitcev dev = device_create(mon_bin_class, ubus? ubus->controller: NULL, 1160ce7cd137SPete Zaitcev MKDEV(MAJOR(mon_bin_dev0), minor), "usbmon%d", minor); 1161ce7cd137SPete Zaitcev if (IS_ERR(dev)) 1162ce7cd137SPete Zaitcev return 0; 1163ce7cd137SPete Zaitcev 1164ce7cd137SPete Zaitcev mbus->classdev = dev; 1165ce7cd137SPete Zaitcev return 1; 1166ce7cd137SPete Zaitcev } 1167ce7cd137SPete Zaitcev 1168ce7cd137SPete Zaitcev void mon_bin_del(struct mon_bus *mbus) 1169ce7cd137SPete Zaitcev { 1170ce7cd137SPete Zaitcev device_destroy(mon_bin_class, mbus->classdev->devt); 1171ce7cd137SPete Zaitcev } 1172ce7cd137SPete Zaitcev 11736f23ee1fSPete Zaitcev int __init mon_bin_init(void) 11746f23ee1fSPete Zaitcev { 11756f23ee1fSPete Zaitcev int rc; 11766f23ee1fSPete Zaitcev 1177ce7cd137SPete Zaitcev mon_bin_class = class_create(THIS_MODULE, "usbmon"); 1178ce7cd137SPete Zaitcev if (IS_ERR(mon_bin_class)) { 1179ce7cd137SPete Zaitcev rc = PTR_ERR(mon_bin_class); 1180ce7cd137SPete Zaitcev goto err_class; 1181ce7cd137SPete Zaitcev } 1182ce7cd137SPete Zaitcev 11836f23ee1fSPete Zaitcev rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); 11846f23ee1fSPete Zaitcev if (rc < 0) 11856f23ee1fSPete Zaitcev goto err_dev; 11866f23ee1fSPete Zaitcev 11876f23ee1fSPete Zaitcev cdev_init(&mon_bin_cdev, &mon_fops_binary); 11886f23ee1fSPete Zaitcev mon_bin_cdev.owner = THIS_MODULE; 11896f23ee1fSPete Zaitcev 11906f23ee1fSPete Zaitcev rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); 11916f23ee1fSPete Zaitcev if (rc < 0) 11926f23ee1fSPete Zaitcev goto err_add; 11936f23ee1fSPete Zaitcev 11946f23ee1fSPete Zaitcev return 0; 11956f23ee1fSPete Zaitcev 11966f23ee1fSPete Zaitcev err_add: 11976f23ee1fSPete Zaitcev unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); 11986f23ee1fSPete Zaitcev err_dev: 1199ce7cd137SPete Zaitcev class_destroy(mon_bin_class); 1200ce7cd137SPete Zaitcev err_class: 12016f23ee1fSPete Zaitcev return rc; 12026f23ee1fSPete Zaitcev } 12036f23ee1fSPete Zaitcev 120421641e3fSPete Zaitcev void mon_bin_exit(void) 12056f23ee1fSPete Zaitcev { 12066f23ee1fSPete Zaitcev cdev_del(&mon_bin_cdev); 12076f23ee1fSPete Zaitcev unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); 1208ce7cd137SPete Zaitcev class_destroy(mon_bin_class); 12096f23ee1fSPete Zaitcev } 1210