1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 26f23ee1fSPete Zaitcev /* 36f23ee1fSPete Zaitcev * The USB Monitor, inspired by Dave Harding's USBMon. 46f23ee1fSPete Zaitcev * 56f23ee1fSPete Zaitcev * This is a binary format reader. 66f23ee1fSPete Zaitcev * 76f23ee1fSPete Zaitcev * Copyright (C) 2006 Paolo Abeni (paolo.abeni@email.it) 8ce7cd137SPete Zaitcev * Copyright (C) 2006,2007 Pete Zaitcev (zaitcev@redhat.com) 96f23ee1fSPete Zaitcev */ 106f23ee1fSPete Zaitcev 116f23ee1fSPete Zaitcev #include <linux/kernel.h> 12174cd4b1SIngo Molnar #include <linux/sched/signal.h> 136f23ee1fSPete Zaitcev #include <linux/types.h> 146f23ee1fSPete Zaitcev #include <linux/fs.h> 156f23ee1fSPete Zaitcev #include <linux/cdev.h> 16f940fcd8SPaul Gortmaker #include <linux/export.h> 176f23ee1fSPete Zaitcev #include <linux/usb.h> 186f23ee1fSPete Zaitcev #include <linux/poll.h> 196f23ee1fSPete Zaitcev #include <linux/compat.h> 206f23ee1fSPete Zaitcev #include <linux/mm.h> 21b375e116SAlan Stern #include <linux/scatterlist.h> 225a0e3ad6STejun Heo #include <linux/slab.h> 238ab0f723STina Ruchandani #include <linux/time64.h> 246f23ee1fSPete Zaitcev 257c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 266f23ee1fSPete Zaitcev 276f23ee1fSPete Zaitcev #include "usb_mon.h" 286f23ee1fSPete Zaitcev 296f23ee1fSPete Zaitcev /* 306f23ee1fSPete Zaitcev * Defined by USB 2.0 clause 9.3, table 9.2. 316f23ee1fSPete Zaitcev */ 326f23ee1fSPete Zaitcev #define SETUP_LEN 8 336f23ee1fSPete Zaitcev 346f23ee1fSPete Zaitcev /* ioctl macros */ 356f23ee1fSPete Zaitcev #define MON_IOC_MAGIC 0x92 366f23ee1fSPete Zaitcev 376f23ee1fSPete Zaitcev #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1) 386f23ee1fSPete Zaitcev /* #2 used to be MON_IOCX_URB, removed before it got into Linus tree */ 396f23ee1fSPete Zaitcev #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats) 406f23ee1fSPete Zaitcev #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4) 416f23ee1fSPete Zaitcev #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5) 426f23ee1fSPete Zaitcev #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get) 436f23ee1fSPete Zaitcev #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch) 446f23ee1fSPete Zaitcev #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8) 45471c604dSPete Zaitcev /* #9 was MON_IOCT_SETAPI */ 46471c604dSPete Zaitcev #define MON_IOCX_GETX _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get) 477abce6beSPete Zaitcev 486f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 496f23ee1fSPete Zaitcev #define MON_IOCX_GET32 _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get32) 506f23ee1fSPete Zaitcev #define MON_IOCX_MFETCH32 _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch32) 51471c604dSPete Zaitcev #define MON_IOCX_GETX32 _IOW(MON_IOC_MAGIC, 10, struct mon_bin_get32) 526f23ee1fSPete Zaitcev #endif 536f23ee1fSPete Zaitcev 546f23ee1fSPete Zaitcev /* 556f23ee1fSPete Zaitcev * Some architectures have enormous basic pages (16KB for ia64, 64KB for ppc). 566f23ee1fSPete Zaitcev * But it's all right. Just use a simple way to make sure the chunk is never 576f23ee1fSPete Zaitcev * smaller than a page. 586f23ee1fSPete Zaitcev * 596f23ee1fSPete Zaitcev * N.B. An application does not know our chunk size. 606f23ee1fSPete Zaitcev * 616f23ee1fSPete Zaitcev * Woops, get_zeroed_page() returns a single page. I guess we're stuck with 626f23ee1fSPete Zaitcev * page-sized chunks for the time being. 636f23ee1fSPete Zaitcev */ 646f23ee1fSPete Zaitcev #define CHUNK_SIZE PAGE_SIZE 656f23ee1fSPete Zaitcev #define CHUNK_ALIGN(x) (((x)+CHUNK_SIZE-1) & ~(CHUNK_SIZE-1)) 666f23ee1fSPete Zaitcev 676f23ee1fSPete Zaitcev /* 686f23ee1fSPete Zaitcev * The magic limit was calculated so that it allows the monitoring 696f23ee1fSPete Zaitcev * application to pick data once in two ticks. This way, another application, 706f23ee1fSPete Zaitcev * which presumably drives the bus, gets to hog CPU, yet we collect our data. 716f23ee1fSPete Zaitcev * If HZ is 100, a 480 mbit/s bus drives 614 KB every jiffy. USB has an 726f23ee1fSPete Zaitcev * enormous overhead built into the bus protocol, so we need about 1000 KB. 736f23ee1fSPete Zaitcev * 746f23ee1fSPete Zaitcev * This is still too much for most cases, where we just snoop a few 756f23ee1fSPete Zaitcev * descriptor fetches for enumeration. So, the default is a "reasonable" 766f23ee1fSPete Zaitcev * amount for systems with HZ=250 and incomplete bus saturation. 776f23ee1fSPete Zaitcev * 786f23ee1fSPete Zaitcev * XXX What about multi-megabyte URBs which take minutes to transfer? 796f23ee1fSPete Zaitcev */ 806f23ee1fSPete Zaitcev #define BUFF_MAX CHUNK_ALIGN(1200*1024) 816f23ee1fSPete Zaitcev #define BUFF_DFL CHUNK_ALIGN(300*1024) 826f23ee1fSPete Zaitcev #define BUFF_MIN CHUNK_ALIGN(8*1024) 836f23ee1fSPete Zaitcev 846f23ee1fSPete Zaitcev /* 856f23ee1fSPete Zaitcev * The per-event API header (2 per URB). 866f23ee1fSPete Zaitcev * 876f23ee1fSPete Zaitcev * This structure is seen in userland as defined by the documentation. 886f23ee1fSPete Zaitcev */ 896f23ee1fSPete Zaitcev struct mon_bin_hdr { 906f23ee1fSPete Zaitcev u64 id; /* URB ID - from submission to callback */ 916f23ee1fSPete Zaitcev unsigned char type; /* Same as in text API; extensible. */ 926f23ee1fSPete Zaitcev unsigned char xfer_type; /* ISO, Intr, Control, Bulk */ 936f23ee1fSPete Zaitcev unsigned char epnum; /* Endpoint number and transfer direction */ 946f23ee1fSPete Zaitcev unsigned char devnum; /* Device address */ 956f23ee1fSPete Zaitcev unsigned short busnum; /* Bus number */ 966f23ee1fSPete Zaitcev char flag_setup; 976f23ee1fSPete Zaitcev char flag_data; 9861ef4b90SArnd Bergmann s64 ts_sec; /* ktime_get_real_ts64 */ 9961ef4b90SArnd Bergmann s32 ts_usec; /* ktime_get_real_ts64 */ 1006f23ee1fSPete Zaitcev int status; 1016f23ee1fSPete Zaitcev unsigned int len_urb; /* Length of data (submitted or actual) */ 1026f23ee1fSPete Zaitcev unsigned int len_cap; /* Delivered length */ 103471c604dSPete Zaitcev union { 1046f23ee1fSPete Zaitcev unsigned char setup[SETUP_LEN]; /* Only for Control S-type */ 105471c604dSPete Zaitcev struct iso_rec { 106471c604dSPete Zaitcev int error_count; 107471c604dSPete Zaitcev int numdesc; 108471c604dSPete Zaitcev } iso; 109471c604dSPete Zaitcev } s; 110471c604dSPete Zaitcev int interval; 111471c604dSPete Zaitcev int start_frame; 112471c604dSPete Zaitcev unsigned int xfer_flags; 113471c604dSPete Zaitcev unsigned int ndesc; /* Actual number of ISO descriptors */ 114471c604dSPete Zaitcev }; 115471c604dSPete Zaitcev 116471c604dSPete Zaitcev /* 117471c604dSPete Zaitcev * ISO vector, packed into the head of data stream. 118471c604dSPete Zaitcev * This has to take 16 bytes to make sure that the end of buffer 119471c604dSPete Zaitcev * wrap is not happening in the middle of a descriptor. 120471c604dSPete Zaitcev */ 121471c604dSPete Zaitcev struct mon_bin_isodesc { 122471c604dSPete Zaitcev int iso_status; 123471c604dSPete Zaitcev unsigned int iso_off; 124471c604dSPete Zaitcev unsigned int iso_len; 125471c604dSPete Zaitcev u32 _pad; 1266f23ee1fSPete Zaitcev }; 1276f23ee1fSPete Zaitcev 1286f23ee1fSPete Zaitcev /* per file statistic */ 1296f23ee1fSPete Zaitcev struct mon_bin_stats { 1306f23ee1fSPete Zaitcev u32 queued; 1316f23ee1fSPete Zaitcev u32 dropped; 1326f23ee1fSPete Zaitcev }; 1336f23ee1fSPete Zaitcev 1346f23ee1fSPete Zaitcev struct mon_bin_get { 135471c604dSPete Zaitcev struct mon_bin_hdr __user *hdr; /* Can be 48 bytes or 64. */ 1366f23ee1fSPete Zaitcev void __user *data; 1376f23ee1fSPete Zaitcev size_t alloc; /* Length of data (can be zero) */ 1386f23ee1fSPete Zaitcev }; 1396f23ee1fSPete Zaitcev 1406f23ee1fSPete Zaitcev struct mon_bin_mfetch { 1416f23ee1fSPete Zaitcev u32 __user *offvec; /* Vector of events fetched */ 1426f23ee1fSPete Zaitcev u32 nfetch; /* Number of events to fetch (out: fetched) */ 1436f23ee1fSPete Zaitcev u32 nflush; /* Number of events to flush */ 1446f23ee1fSPete Zaitcev }; 1456f23ee1fSPete Zaitcev 1466f23ee1fSPete Zaitcev #ifdef CONFIG_COMPAT 1476f23ee1fSPete Zaitcev struct mon_bin_get32 { 1486f23ee1fSPete Zaitcev u32 hdr32; 1496f23ee1fSPete Zaitcev u32 data32; 1506f23ee1fSPete Zaitcev u32 alloc32; 1516f23ee1fSPete Zaitcev }; 1526f23ee1fSPete Zaitcev 1536f23ee1fSPete Zaitcev struct mon_bin_mfetch32 { 1546f23ee1fSPete Zaitcev u32 offvec32; 1556f23ee1fSPete Zaitcev u32 nfetch32; 1566f23ee1fSPete Zaitcev u32 nflush32; 1576f23ee1fSPete Zaitcev }; 1586f23ee1fSPete Zaitcev #endif 1596f23ee1fSPete Zaitcev 1606f23ee1fSPete Zaitcev /* Having these two values same prevents wrapping of the mon_bin_hdr */ 1616f23ee1fSPete Zaitcev #define PKT_ALIGN 64 1626f23ee1fSPete Zaitcev #define PKT_SIZE 64 1636f23ee1fSPete Zaitcev 164471c604dSPete Zaitcev #define PKT_SZ_API0 48 /* API 0 (2.6.20) size */ 165471c604dSPete Zaitcev #define PKT_SZ_API1 64 /* API 1 size: extra fields */ 166471c604dSPete Zaitcev 167471c604dSPete Zaitcev #define ISODESC_MAX 128 /* Same number as usbfs allows, 2048 bytes. */ 168471c604dSPete Zaitcev 1696f23ee1fSPete Zaitcev /* max number of USB bus supported */ 1706f23ee1fSPete Zaitcev #define MON_BIN_MAX_MINOR 128 1716f23ee1fSPete Zaitcev 1726f23ee1fSPete Zaitcev /* 1736f23ee1fSPete Zaitcev * The buffer: map of used pages. 1746f23ee1fSPete Zaitcev */ 1756f23ee1fSPete Zaitcev struct mon_pgmap { 1766f23ee1fSPete Zaitcev struct page *pg; 1776f23ee1fSPete Zaitcev unsigned char *ptr; /* XXX just use page_to_virt everywhere? */ 1786f23ee1fSPete Zaitcev }; 1796f23ee1fSPete Zaitcev 1806f23ee1fSPete Zaitcev /* 1816f23ee1fSPete Zaitcev * This gets associated with an open file struct. 1826f23ee1fSPete Zaitcev */ 1836f23ee1fSPete Zaitcev struct mon_reader_bin { 1846f23ee1fSPete Zaitcev /* The buffer: one per open. */ 1856f23ee1fSPete Zaitcev spinlock_t b_lock; /* Protect b_cnt, b_in */ 1866f23ee1fSPete Zaitcev unsigned int b_size; /* Current size of the buffer - bytes */ 1876f23ee1fSPete Zaitcev unsigned int b_cnt; /* Bytes used */ 1886f23ee1fSPete Zaitcev unsigned int b_in, b_out; /* Offsets into buffer - bytes */ 1896f23ee1fSPete Zaitcev unsigned int b_read; /* Amount of read data in curr. pkt. */ 1906f23ee1fSPete Zaitcev struct mon_pgmap *b_vec; /* The map array */ 1916f23ee1fSPete Zaitcev wait_queue_head_t b_wait; /* Wait for data here */ 1926f23ee1fSPete Zaitcev 1936f23ee1fSPete Zaitcev struct mutex fetch_lock; /* Protect b_read, b_out */ 1946f23ee1fSPete Zaitcev int mmap_active; 1956f23ee1fSPete Zaitcev 1966f23ee1fSPete Zaitcev /* A list of these is needed for "bus 0". Some time later. */ 1976f23ee1fSPete Zaitcev struct mon_reader r; 1986f23ee1fSPete Zaitcev 1996f23ee1fSPete Zaitcev /* Stats */ 2006f23ee1fSPete Zaitcev unsigned int cnt_lost; 2016f23ee1fSPete Zaitcev }; 2026f23ee1fSPete Zaitcev 2036f23ee1fSPete Zaitcev static inline struct mon_bin_hdr *MON_OFF2HDR(const struct mon_reader_bin *rp, 2046f23ee1fSPete Zaitcev unsigned int offset) 2056f23ee1fSPete Zaitcev { 2066f23ee1fSPete Zaitcev return (struct mon_bin_hdr *) 2076f23ee1fSPete Zaitcev (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); 2086f23ee1fSPete Zaitcev } 2096f23ee1fSPete Zaitcev 2106f23ee1fSPete Zaitcev #define MON_RING_EMPTY(rp) ((rp)->b_cnt == 0) 2116f23ee1fSPete Zaitcev 21230c7431dSPete Zaitcev static unsigned char xfer_to_pipe[4] = { 21330c7431dSPete Zaitcev PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT 21430c7431dSPete Zaitcev }; 21530c7431dSPete Zaitcev 216*e571e843SIvan Orlov static const struct class mon_bin_class = { 217*e571e843SIvan Orlov .name = "usbmon", 218*e571e843SIvan Orlov }; 219*e571e843SIvan Orlov 2206f23ee1fSPete Zaitcev static dev_t mon_bin_dev0; 2216f23ee1fSPete Zaitcev static struct cdev mon_bin_cdev; 2226f23ee1fSPete Zaitcev 2236f23ee1fSPete Zaitcev static void mon_buff_area_fill(const struct mon_reader_bin *rp, 2246f23ee1fSPete Zaitcev unsigned int offset, unsigned int size); 2256f23ee1fSPete Zaitcev static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp); 2266f23ee1fSPete Zaitcev static int mon_alloc_buff(struct mon_pgmap *map, int npages); 2276f23ee1fSPete Zaitcev static void mon_free_buff(struct mon_pgmap *map, int npages); 2286f23ee1fSPete Zaitcev 2296f23ee1fSPete Zaitcev /* 2306f23ee1fSPete Zaitcev * This is a "chunked memcpy". It does not manipulate any counters. 2316f23ee1fSPete Zaitcev */ 232b375e116SAlan Stern static unsigned int mon_copy_to_buff(const struct mon_reader_bin *this, 2336f23ee1fSPete Zaitcev unsigned int off, const unsigned char *from, unsigned int length) 2346f23ee1fSPete Zaitcev { 2356f23ee1fSPete Zaitcev unsigned int step_len; 2366f23ee1fSPete Zaitcev unsigned char *buf; 2376f23ee1fSPete Zaitcev unsigned int in_page; 2386f23ee1fSPete Zaitcev 2396f23ee1fSPete Zaitcev while (length) { 2406f23ee1fSPete Zaitcev /* 2416f23ee1fSPete Zaitcev * Determine step_len. 2426f23ee1fSPete Zaitcev */ 2436f23ee1fSPete Zaitcev step_len = length; 2446f23ee1fSPete Zaitcev in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); 2456f23ee1fSPete Zaitcev if (in_page < step_len) 2466f23ee1fSPete Zaitcev step_len = in_page; 2476f23ee1fSPete Zaitcev 2486f23ee1fSPete Zaitcev /* 2496f23ee1fSPete Zaitcev * Copy data and advance pointers. 2506f23ee1fSPete Zaitcev */ 2516f23ee1fSPete Zaitcev buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; 2526f23ee1fSPete Zaitcev memcpy(buf, from, step_len); 2536f23ee1fSPete Zaitcev if ((off += step_len) >= this->b_size) off = 0; 2546f23ee1fSPete Zaitcev from += step_len; 2556f23ee1fSPete Zaitcev length -= step_len; 2566f23ee1fSPete Zaitcev } 257b375e116SAlan Stern return off; 2586f23ee1fSPete Zaitcev } 2596f23ee1fSPete Zaitcev 2606f23ee1fSPete Zaitcev /* 2616f23ee1fSPete Zaitcev * This is a little worse than the above because it's "chunked copy_to_user". 2626f23ee1fSPete Zaitcev * The return value is an error code, not an offset. 2636f23ee1fSPete Zaitcev */ 2646f23ee1fSPete Zaitcev static int copy_from_buf(const struct mon_reader_bin *this, unsigned int off, 2656f23ee1fSPete Zaitcev char __user *to, int length) 2666f23ee1fSPete Zaitcev { 2676f23ee1fSPete Zaitcev unsigned int step_len; 2686f23ee1fSPete Zaitcev unsigned char *buf; 2696f23ee1fSPete Zaitcev unsigned int in_page; 2706f23ee1fSPete Zaitcev 2716f23ee1fSPete Zaitcev while (length) { 2726f23ee1fSPete Zaitcev /* 2736f23ee1fSPete Zaitcev * Determine step_len. 2746f23ee1fSPete Zaitcev */ 2756f23ee1fSPete Zaitcev step_len = length; 2766f23ee1fSPete Zaitcev in_page = CHUNK_SIZE - (off & (CHUNK_SIZE-1)); 2776f23ee1fSPete Zaitcev if (in_page < step_len) 2786f23ee1fSPete Zaitcev step_len = in_page; 2796f23ee1fSPete Zaitcev 2806f23ee1fSPete Zaitcev /* 2816f23ee1fSPete Zaitcev * Copy data and advance pointers. 2826f23ee1fSPete Zaitcev */ 2836f23ee1fSPete Zaitcev buf = this->b_vec[off / CHUNK_SIZE].ptr + off % CHUNK_SIZE; 2846f23ee1fSPete Zaitcev if (copy_to_user(to, buf, step_len)) 2856f23ee1fSPete Zaitcev return -EINVAL; 2866f23ee1fSPete Zaitcev if ((off += step_len) >= this->b_size) off = 0; 2876f23ee1fSPete Zaitcev to += step_len; 2886f23ee1fSPete Zaitcev length -= step_len; 2896f23ee1fSPete Zaitcev } 2906f23ee1fSPete Zaitcev return 0; 2916f23ee1fSPete Zaitcev } 2926f23ee1fSPete Zaitcev 2936f23ee1fSPete Zaitcev /* 2946f23ee1fSPete Zaitcev * Allocate an (aligned) area in the buffer. 2956f23ee1fSPete Zaitcev * This is called under b_lock. 2966f23ee1fSPete Zaitcev * Returns ~0 on failure. 2976f23ee1fSPete Zaitcev */ 2986f23ee1fSPete Zaitcev static unsigned int mon_buff_area_alloc(struct mon_reader_bin *rp, 2996f23ee1fSPete Zaitcev unsigned int size) 3006f23ee1fSPete Zaitcev { 3016f23ee1fSPete Zaitcev unsigned int offset; 3026f23ee1fSPete Zaitcev 3036f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3046f23ee1fSPete Zaitcev if (rp->b_cnt + size > rp->b_size) 3056f23ee1fSPete Zaitcev return ~0; 3066f23ee1fSPete Zaitcev offset = rp->b_in; 3076f23ee1fSPete Zaitcev rp->b_cnt += size; 3086f23ee1fSPete Zaitcev if ((rp->b_in += size) >= rp->b_size) 3096f23ee1fSPete Zaitcev rp->b_in -= rp->b_size; 3106f23ee1fSPete Zaitcev return offset; 3116f23ee1fSPete Zaitcev } 3126f23ee1fSPete Zaitcev 3136f23ee1fSPete Zaitcev /* 3146f23ee1fSPete Zaitcev * This is the same thing as mon_buff_area_alloc, only it does not allow 3156f23ee1fSPete Zaitcev * buffers to wrap. This is needed by applications which pass references 3166f23ee1fSPete Zaitcev * into mmap-ed buffers up their stacks (libpcap can do that). 3176f23ee1fSPete Zaitcev * 3186f23ee1fSPete Zaitcev * Currently, we always have the header stuck with the data, although 3196f23ee1fSPete Zaitcev * it is not strictly speaking necessary. 3206f23ee1fSPete Zaitcev * 3216f23ee1fSPete Zaitcev * When a buffer would wrap, we place a filler packet to mark the space. 3226f23ee1fSPete Zaitcev */ 3236f23ee1fSPete Zaitcev static unsigned int mon_buff_area_alloc_contiguous(struct mon_reader_bin *rp, 3246f23ee1fSPete Zaitcev unsigned int size) 3256f23ee1fSPete Zaitcev { 3266f23ee1fSPete Zaitcev unsigned int offset; 3276f23ee1fSPete Zaitcev unsigned int fill_size; 3286f23ee1fSPete Zaitcev 3296f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3306f23ee1fSPete Zaitcev if (rp->b_cnt + size > rp->b_size) 3316f23ee1fSPete Zaitcev return ~0; 3326f23ee1fSPete Zaitcev if (rp->b_in + size > rp->b_size) { 3336f23ee1fSPete Zaitcev /* 3346f23ee1fSPete Zaitcev * This would wrap. Find if we still have space after 3356f23ee1fSPete Zaitcev * skipping to the end of the buffer. If we do, place 3366f23ee1fSPete Zaitcev * a filler packet and allocate a new packet. 3376f23ee1fSPete Zaitcev */ 3386f23ee1fSPete Zaitcev fill_size = rp->b_size - rp->b_in; 3396f23ee1fSPete Zaitcev if (rp->b_cnt + size + fill_size > rp->b_size) 3406f23ee1fSPete Zaitcev return ~0; 3416f23ee1fSPete Zaitcev mon_buff_area_fill(rp, rp->b_in, fill_size); 3426f23ee1fSPete Zaitcev 3436f23ee1fSPete Zaitcev offset = 0; 3446f23ee1fSPete Zaitcev rp->b_in = size; 3456f23ee1fSPete Zaitcev rp->b_cnt += size + fill_size; 3466f23ee1fSPete Zaitcev } else if (rp->b_in + size == rp->b_size) { 3476f23ee1fSPete Zaitcev offset = rp->b_in; 3486f23ee1fSPete Zaitcev rp->b_in = 0; 3496f23ee1fSPete Zaitcev rp->b_cnt += size; 3506f23ee1fSPete Zaitcev } else { 3516f23ee1fSPete Zaitcev offset = rp->b_in; 3526f23ee1fSPete Zaitcev rp->b_in += size; 3536f23ee1fSPete Zaitcev rp->b_cnt += size; 3546f23ee1fSPete Zaitcev } 3556f23ee1fSPete Zaitcev return offset; 3566f23ee1fSPete Zaitcev } 3576f23ee1fSPete Zaitcev 3586f23ee1fSPete Zaitcev /* 3596f23ee1fSPete Zaitcev * Return a few (kilo-)bytes to the head of the buffer. 360fca94748SAlan Stern * This is used if a data fetch fails. 3616f23ee1fSPete Zaitcev */ 3626f23ee1fSPete Zaitcev static void mon_buff_area_shrink(struct mon_reader_bin *rp, unsigned int size) 3636f23ee1fSPete Zaitcev { 3646f23ee1fSPete Zaitcev 365fca94748SAlan Stern /* size &= ~(PKT_ALIGN-1); -- we're called with aligned size */ 3666f23ee1fSPete Zaitcev rp->b_cnt -= size; 3676f23ee1fSPete Zaitcev if (rp->b_in < size) 3686f23ee1fSPete Zaitcev rp->b_in += rp->b_size; 3696f23ee1fSPete Zaitcev rp->b_in -= size; 3706f23ee1fSPete Zaitcev } 3716f23ee1fSPete Zaitcev 3726f23ee1fSPete Zaitcev /* 3736f23ee1fSPete Zaitcev * This has to be called under both b_lock and fetch_lock, because 3746f23ee1fSPete Zaitcev * it accesses both b_cnt and b_out. 3756f23ee1fSPete Zaitcev */ 3766f23ee1fSPete Zaitcev static void mon_buff_area_free(struct mon_reader_bin *rp, unsigned int size) 3776f23ee1fSPete Zaitcev { 3786f23ee1fSPete Zaitcev 3796f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 3806f23ee1fSPete Zaitcev rp->b_cnt -= size; 3816f23ee1fSPete Zaitcev if ((rp->b_out += size) >= rp->b_size) 3826f23ee1fSPete Zaitcev rp->b_out -= rp->b_size; 3836f23ee1fSPete Zaitcev } 3846f23ee1fSPete Zaitcev 3856f23ee1fSPete Zaitcev static void mon_buff_area_fill(const struct mon_reader_bin *rp, 3866f23ee1fSPete Zaitcev unsigned int offset, unsigned int size) 3876f23ee1fSPete Zaitcev { 3886f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 3896f23ee1fSPete Zaitcev 3906f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 3916f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 3926f23ee1fSPete Zaitcev ep->type = '@'; 3936f23ee1fSPete Zaitcev ep->len_cap = size - PKT_SIZE; 3946f23ee1fSPete Zaitcev } 3956f23ee1fSPete Zaitcev 3966f23ee1fSPete Zaitcev static inline char mon_bin_get_setup(unsigned char *setupb, 3976f23ee1fSPete Zaitcev const struct urb *urb, char ev_type) 3986f23ee1fSPete Zaitcev { 3996f23ee1fSPete Zaitcev 4006f23ee1fSPete Zaitcev if (urb->setup_packet == NULL) 4016f23ee1fSPete Zaitcev return 'Z'; 4026f23ee1fSPete Zaitcev memcpy(setupb, urb->setup_packet, SETUP_LEN); 4036f23ee1fSPete Zaitcev return 0; 4046f23ee1fSPete Zaitcev } 4056f23ee1fSPete Zaitcev 406b375e116SAlan Stern static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp, 407b375e116SAlan Stern unsigned int offset, struct urb *urb, unsigned int length, 408b375e116SAlan Stern char *flag) 4096f23ee1fSPete Zaitcev { 410b375e116SAlan Stern int i; 411b375e116SAlan Stern struct scatterlist *sg; 412b375e116SAlan Stern unsigned int this_len; 4136f23ee1fSPete Zaitcev 414b375e116SAlan Stern *flag = 0; 415b375e116SAlan Stern if (urb->num_sgs == 0) { 416b375e116SAlan Stern if (urb->transfer_buffer == NULL) { 417b375e116SAlan Stern *flag = 'Z'; 418b375e116SAlan Stern return length; 419b375e116SAlan Stern } 4206f23ee1fSPete Zaitcev mon_copy_to_buff(rp, offset, urb->transfer_buffer, length); 421b375e116SAlan Stern length = 0; 422b375e116SAlan Stern 423b375e116SAlan Stern } else { 424b375e116SAlan Stern /* If IOMMU coalescing occurred, we cannot trust sg_page */ 425ff9c895fSAlan Stern if (urb->transfer_flags & URB_DMA_SG_COMBINED) { 426b375e116SAlan Stern *flag = 'D'; 427b375e116SAlan Stern return length; 428b375e116SAlan Stern } 429b375e116SAlan Stern 430b375e116SAlan Stern /* Copy up to the first non-addressable segment */ 431910f8d0cSMatthew Wilcox for_each_sg(urb->sg, sg, urb->num_sgs, i) { 432b375e116SAlan Stern if (length == 0 || PageHighMem(sg_page(sg))) 433b375e116SAlan Stern break; 434b375e116SAlan Stern this_len = min_t(unsigned int, sg->length, length); 435b375e116SAlan Stern offset = mon_copy_to_buff(rp, offset, sg_virt(sg), 436b375e116SAlan Stern this_len); 437b375e116SAlan Stern length -= this_len; 438b375e116SAlan Stern } 439b375e116SAlan Stern if (i == 0) 440b375e116SAlan Stern *flag = 'D'; 441b375e116SAlan Stern } 442b375e116SAlan Stern 443b375e116SAlan Stern return length; 4446f23ee1fSPete Zaitcev } 4456f23ee1fSPete Zaitcev 446b17ea167SPete Zaitcev /* 447b17ea167SPete Zaitcev * This is the look-ahead pass in case of 'C Zi', when actual_length cannot 448b17ea167SPete Zaitcev * be used to determine the length of the whole contiguous buffer. 449b17ea167SPete Zaitcev */ 450b17ea167SPete Zaitcev static unsigned int mon_bin_collate_isodesc(const struct mon_reader_bin *rp, 451b17ea167SPete Zaitcev struct urb *urb, unsigned int ndesc) 452b17ea167SPete Zaitcev { 453b17ea167SPete Zaitcev struct usb_iso_packet_descriptor *fp; 454b17ea167SPete Zaitcev unsigned int length; 455b17ea167SPete Zaitcev 456b17ea167SPete Zaitcev length = 0; 457b17ea167SPete Zaitcev fp = urb->iso_frame_desc; 458b17ea167SPete Zaitcev while (ndesc-- != 0) { 459b17ea167SPete Zaitcev if (fp->actual_length != 0) { 460b17ea167SPete Zaitcev if (fp->offset + fp->actual_length > length) 461b17ea167SPete Zaitcev length = fp->offset + fp->actual_length; 462b17ea167SPete Zaitcev } 463b17ea167SPete Zaitcev fp++; 464b17ea167SPete Zaitcev } 465b17ea167SPete Zaitcev return length; 466b17ea167SPete Zaitcev } 467b17ea167SPete Zaitcev 468471c604dSPete Zaitcev static void mon_bin_get_isodesc(const struct mon_reader_bin *rp, 469471c604dSPete Zaitcev unsigned int offset, struct urb *urb, char ev_type, unsigned int ndesc) 470471c604dSPete Zaitcev { 471471c604dSPete Zaitcev struct mon_bin_isodesc *dp; 472471c604dSPete Zaitcev struct usb_iso_packet_descriptor *fp; 473471c604dSPete Zaitcev 474471c604dSPete Zaitcev fp = urb->iso_frame_desc; 475471c604dSPete Zaitcev while (ndesc-- != 0) { 476471c604dSPete Zaitcev dp = (struct mon_bin_isodesc *) 477471c604dSPete Zaitcev (rp->b_vec[offset / CHUNK_SIZE].ptr + offset % CHUNK_SIZE); 478471c604dSPete Zaitcev dp->iso_status = fp->status; 479471c604dSPete Zaitcev dp->iso_off = fp->offset; 480471c604dSPete Zaitcev dp->iso_len = (ev_type == 'S') ? fp->length : fp->actual_length; 481471c604dSPete Zaitcev dp->_pad = 0; 482471c604dSPete Zaitcev if ((offset += sizeof(struct mon_bin_isodesc)) >= rp->b_size) 483471c604dSPete Zaitcev offset = 0; 484471c604dSPete Zaitcev fp++; 485471c604dSPete Zaitcev } 486471c604dSPete Zaitcev } 487471c604dSPete Zaitcev 4886f23ee1fSPete Zaitcev static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb, 4899347d51cSAlan Stern char ev_type, int status) 4906f23ee1fSPete Zaitcev { 49130c7431dSPete Zaitcev const struct usb_endpoint_descriptor *epd = &urb->ep->desc; 4928ab0f723STina Ruchandani struct timespec64 ts; 4932bc0d109SPete Zaitcev unsigned long flags; 4946f23ee1fSPete Zaitcev unsigned int urb_length; 4956f23ee1fSPete Zaitcev unsigned int offset; 4966f23ee1fSPete Zaitcev unsigned int length; 497fca94748SAlan Stern unsigned int delta; 498471c604dSPete Zaitcev unsigned int ndesc, lendesc; 49930c7431dSPete Zaitcev unsigned char dir; 5006f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 5016f23ee1fSPete Zaitcev char data_tag = 0; 5026f23ee1fSPete Zaitcev 50361ef4b90SArnd Bergmann ktime_get_real_ts64(&ts); 5046f23ee1fSPete Zaitcev 5056f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 5066f23ee1fSPete Zaitcev 5076f23ee1fSPete Zaitcev /* 5086f23ee1fSPete Zaitcev * Find the maximum allowable length, then allocate space. 5096f23ee1fSPete Zaitcev */ 510b17ea167SPete Zaitcev urb_length = (ev_type == 'S') ? 511b17ea167SPete Zaitcev urb->transfer_buffer_length : urb->actual_length; 512b17ea167SPete Zaitcev length = urb_length; 513b17ea167SPete Zaitcev 514471c604dSPete Zaitcev if (usb_endpoint_xfer_isoc(epd)) { 515471c604dSPete Zaitcev if (urb->number_of_packets < 0) { 516471c604dSPete Zaitcev ndesc = 0; 517471c604dSPete Zaitcev } else if (urb->number_of_packets >= ISODESC_MAX) { 518471c604dSPete Zaitcev ndesc = ISODESC_MAX; 519471c604dSPete Zaitcev } else { 520471c604dSPete Zaitcev ndesc = urb->number_of_packets; 521471c604dSPete Zaitcev } 522b17ea167SPete Zaitcev if (ev_type == 'C' && usb_urb_dir_in(urb)) 523b17ea167SPete Zaitcev length = mon_bin_collate_isodesc(rp, urb, ndesc); 524471c604dSPete Zaitcev } else { 525471c604dSPete Zaitcev ndesc = 0; 526471c604dSPete Zaitcev } 527471c604dSPete Zaitcev lendesc = ndesc*sizeof(struct mon_bin_isodesc); 528471c604dSPete Zaitcev 529b17ea167SPete Zaitcev /* not an issue unless there's a subtle bug in a HCD somewhere */ 530b17ea167SPete Zaitcev if (length >= urb->transfer_buffer_length) 531b17ea167SPete Zaitcev length = urb->transfer_buffer_length; 5326f23ee1fSPete Zaitcev 5336f23ee1fSPete Zaitcev if (length >= rp->b_size/5) 5346f23ee1fSPete Zaitcev length = rp->b_size/5; 5356f23ee1fSPete Zaitcev 53618ea5d00SAlan Stern if (usb_urb_dir_in(urb)) { 5376f23ee1fSPete Zaitcev if (ev_type == 'S') { 5386f23ee1fSPete Zaitcev length = 0; 5396f23ee1fSPete Zaitcev data_tag = '<'; 5406f23ee1fSPete Zaitcev } 54130c7431dSPete Zaitcev /* Cannot rely on endpoint number in case of control ep.0 */ 54230c7431dSPete Zaitcev dir = USB_DIR_IN; 5436f23ee1fSPete Zaitcev } else { 5446f23ee1fSPete Zaitcev if (ev_type == 'C') { 5456f23ee1fSPete Zaitcev length = 0; 5466f23ee1fSPete Zaitcev data_tag = '>'; 5476f23ee1fSPete Zaitcev } 54830c7431dSPete Zaitcev dir = 0; 5496f23ee1fSPete Zaitcev } 5506f23ee1fSPete Zaitcev 551471c604dSPete Zaitcev if (rp->mmap_active) { 552471c604dSPete Zaitcev offset = mon_buff_area_alloc_contiguous(rp, 553471c604dSPete Zaitcev length + PKT_SIZE + lendesc); 554471c604dSPete Zaitcev } else { 555471c604dSPete Zaitcev offset = mon_buff_area_alloc(rp, length + PKT_SIZE + lendesc); 556471c604dSPete Zaitcev } 5576f23ee1fSPete Zaitcev if (offset == ~0) { 5586f23ee1fSPete Zaitcev rp->cnt_lost++; 5596f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 5606f23ee1fSPete Zaitcev return; 5616f23ee1fSPete Zaitcev } 5626f23ee1fSPete Zaitcev 5636f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 5646f23ee1fSPete Zaitcev if ((offset += PKT_SIZE) >= rp->b_size) offset = 0; 5656f23ee1fSPete Zaitcev 5666f23ee1fSPete Zaitcev /* 5676f23ee1fSPete Zaitcev * Fill the allocated area. 5686f23ee1fSPete Zaitcev */ 5696f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 5706f23ee1fSPete Zaitcev ep->type = ev_type; 57130c7431dSPete Zaitcev ep->xfer_type = xfer_to_pipe[usb_endpoint_type(epd)]; 57230c7431dSPete Zaitcev ep->epnum = dir | usb_endpoint_num(epd); 57318ea5d00SAlan Stern ep->devnum = urb->dev->devnum; 574ecb658d3SPete Zaitcev ep->busnum = urb->dev->bus->busnum; 5756f23ee1fSPete Zaitcev ep->id = (unsigned long) urb; 5766f23ee1fSPete Zaitcev ep->ts_sec = ts.tv_sec; 5778ab0f723STina Ruchandani ep->ts_usec = ts.tv_nsec / NSEC_PER_USEC; 5789347d51cSAlan Stern ep->status = status; 5796f23ee1fSPete Zaitcev ep->len_urb = urb_length; 580471c604dSPete Zaitcev ep->len_cap = length + lendesc; 581471c604dSPete Zaitcev ep->xfer_flags = urb->transfer_flags; 5826f23ee1fSPete Zaitcev 583471c604dSPete Zaitcev if (usb_endpoint_xfer_int(epd)) { 584471c604dSPete Zaitcev ep->interval = urb->interval; 585471c604dSPete Zaitcev } else if (usb_endpoint_xfer_isoc(epd)) { 586471c604dSPete Zaitcev ep->interval = urb->interval; 587471c604dSPete Zaitcev ep->start_frame = urb->start_frame; 588471c604dSPete Zaitcev ep->s.iso.error_count = urb->error_count; 589471c604dSPete Zaitcev ep->s.iso.numdesc = urb->number_of_packets; 590471c604dSPete Zaitcev } 591471c604dSPete Zaitcev 592471c604dSPete Zaitcev if (usb_endpoint_xfer_control(epd) && ev_type == 'S') { 593471c604dSPete Zaitcev ep->flag_setup = mon_bin_get_setup(ep->s.setup, urb, ev_type); 594471c604dSPete Zaitcev } else { 595471c604dSPete Zaitcev ep->flag_setup = '-'; 596471c604dSPete Zaitcev } 597471c604dSPete Zaitcev 598471c604dSPete Zaitcev if (ndesc != 0) { 599471c604dSPete Zaitcev ep->ndesc = ndesc; 600471c604dSPete Zaitcev mon_bin_get_isodesc(rp, offset, urb, ev_type, ndesc); 601471c604dSPete Zaitcev if ((offset += lendesc) >= rp->b_size) 602471c604dSPete Zaitcev offset -= rp->b_size; 603471c604dSPete Zaitcev } 604471c604dSPete Zaitcev 6056f23ee1fSPete Zaitcev if (length != 0) { 606b375e116SAlan Stern length = mon_bin_get_data(rp, offset, urb, length, 607b375e116SAlan Stern &ep->flag_data); 608b375e116SAlan Stern if (length > 0) { 609fca94748SAlan Stern delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 610fca94748SAlan Stern ep->len_cap -= length; 611fca94748SAlan Stern delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 612fca94748SAlan Stern mon_buff_area_shrink(rp, delta); 6136f23ee1fSPete Zaitcev } 6146f23ee1fSPete Zaitcev } else { 6156f23ee1fSPete Zaitcev ep->flag_data = data_tag; 6166f23ee1fSPete Zaitcev } 6176f23ee1fSPete Zaitcev 6186f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 6196f23ee1fSPete Zaitcev 6206f23ee1fSPete Zaitcev wake_up(&rp->b_wait); 6216f23ee1fSPete Zaitcev } 6226f23ee1fSPete Zaitcev 6236f23ee1fSPete Zaitcev static void mon_bin_submit(void *data, struct urb *urb) 6246f23ee1fSPete Zaitcev { 6256f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 6269347d51cSAlan Stern mon_bin_event(rp, urb, 'S', -EINPROGRESS); 6276f23ee1fSPete Zaitcev } 6286f23ee1fSPete Zaitcev 6299347d51cSAlan Stern static void mon_bin_complete(void *data, struct urb *urb, int status) 6306f23ee1fSPete Zaitcev { 6316f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 6329347d51cSAlan Stern mon_bin_event(rp, urb, 'C', status); 6336f23ee1fSPete Zaitcev } 6346f23ee1fSPete Zaitcev 6356f23ee1fSPete Zaitcev static void mon_bin_error(void *data, struct urb *urb, int error) 6366f23ee1fSPete Zaitcev { 6376f23ee1fSPete Zaitcev struct mon_reader_bin *rp = data; 6388ab0f723STina Ruchandani struct timespec64 ts; 6396f23ee1fSPete Zaitcev unsigned long flags; 6406f23ee1fSPete Zaitcev unsigned int offset; 6416f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 6426f23ee1fSPete Zaitcev 64361ef4b90SArnd Bergmann ktime_get_real_ts64(&ts); 6442bc0d109SPete Zaitcev 6456f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 6466f23ee1fSPete Zaitcev 6476f23ee1fSPete Zaitcev offset = mon_buff_area_alloc(rp, PKT_SIZE); 6486f23ee1fSPete Zaitcev if (offset == ~0) { 6496f23ee1fSPete Zaitcev /* Not incrementing cnt_lost. Just because. */ 6506f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 6516f23ee1fSPete Zaitcev return; 6526f23ee1fSPete Zaitcev } 6536f23ee1fSPete Zaitcev 6546f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, offset); 6556f23ee1fSPete Zaitcev 6566f23ee1fSPete Zaitcev memset(ep, 0, PKT_SIZE); 6576f23ee1fSPete Zaitcev ep->type = 'E'; 65830c7431dSPete Zaitcev ep->xfer_type = xfer_to_pipe[usb_endpoint_type(&urb->ep->desc)]; 65930c7431dSPete Zaitcev ep->epnum = usb_urb_dir_in(urb) ? USB_DIR_IN : 0; 66030c7431dSPete Zaitcev ep->epnum |= usb_endpoint_num(&urb->ep->desc); 66118ea5d00SAlan Stern ep->devnum = urb->dev->devnum; 662ecb658d3SPete Zaitcev ep->busnum = urb->dev->bus->busnum; 6636f23ee1fSPete Zaitcev ep->id = (unsigned long) urb; 6642bc0d109SPete Zaitcev ep->ts_sec = ts.tv_sec; 6658ab0f723STina Ruchandani ep->ts_usec = ts.tv_nsec / NSEC_PER_USEC; 6666f23ee1fSPete Zaitcev ep->status = error; 6676f23ee1fSPete Zaitcev 6686f23ee1fSPete Zaitcev ep->flag_setup = '-'; 6696f23ee1fSPete Zaitcev ep->flag_data = 'E'; 6706f23ee1fSPete Zaitcev 6716f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 6726f23ee1fSPete Zaitcev 6736f23ee1fSPete Zaitcev wake_up(&rp->b_wait); 6746f23ee1fSPete Zaitcev } 6756f23ee1fSPete Zaitcev 6766f23ee1fSPete Zaitcev static int mon_bin_open(struct inode *inode, struct file *file) 6776f23ee1fSPete Zaitcev { 6786f23ee1fSPete Zaitcev struct mon_bus *mbus; 6796f23ee1fSPete Zaitcev struct mon_reader_bin *rp; 6806f23ee1fSPete Zaitcev size_t size; 6816f23ee1fSPete Zaitcev int rc; 6826f23ee1fSPete Zaitcev 6836f23ee1fSPete Zaitcev mutex_lock(&mon_lock); 6840296951aSGreg Kroah-Hartman mbus = mon_bus_lookup(iminor(inode)); 6850296951aSGreg Kroah-Hartman if (mbus == NULL) { 6866f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6876f23ee1fSPete Zaitcev return -ENODEV; 6886f23ee1fSPete Zaitcev } 689ecb658d3SPete Zaitcev if (mbus != &mon_bus0 && mbus->u_bus == NULL) { 6906f23ee1fSPete Zaitcev printk(KERN_ERR TAG ": consistency error on open\n"); 6916f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 6926f23ee1fSPete Zaitcev return -ENODEV; 6936f23ee1fSPete Zaitcev } 6946f23ee1fSPete Zaitcev 6956f23ee1fSPete Zaitcev rp = kzalloc(sizeof(struct mon_reader_bin), GFP_KERNEL); 6966f23ee1fSPete Zaitcev if (rp == NULL) { 6976f23ee1fSPete Zaitcev rc = -ENOMEM; 6986f23ee1fSPete Zaitcev goto err_alloc; 6996f23ee1fSPete Zaitcev } 7006f23ee1fSPete Zaitcev spin_lock_init(&rp->b_lock); 7016f23ee1fSPete Zaitcev init_waitqueue_head(&rp->b_wait); 7026f23ee1fSPete Zaitcev mutex_init(&rp->fetch_lock); 7036f23ee1fSPete Zaitcev rp->b_size = BUFF_DFL; 7046f23ee1fSPete Zaitcev 7056f23ee1fSPete Zaitcev size = sizeof(struct mon_pgmap) * (rp->b_size/CHUNK_SIZE); 7066f23ee1fSPete Zaitcev if ((rp->b_vec = kzalloc(size, GFP_KERNEL)) == NULL) { 7076f23ee1fSPete Zaitcev rc = -ENOMEM; 7086f23ee1fSPete Zaitcev goto err_allocvec; 7096f23ee1fSPete Zaitcev } 7106f23ee1fSPete Zaitcev 7116f23ee1fSPete Zaitcev if ((rc = mon_alloc_buff(rp->b_vec, rp->b_size/CHUNK_SIZE)) < 0) 7126f23ee1fSPete Zaitcev goto err_allocbuff; 7136f23ee1fSPete Zaitcev 7146f23ee1fSPete Zaitcev rp->r.m_bus = mbus; 7156f23ee1fSPete Zaitcev rp->r.r_data = rp; 7166f23ee1fSPete Zaitcev rp->r.rnf_submit = mon_bin_submit; 7176f23ee1fSPete Zaitcev rp->r.rnf_error = mon_bin_error; 7186f23ee1fSPete Zaitcev rp->r.rnf_complete = mon_bin_complete; 7196f23ee1fSPete Zaitcev 7206f23ee1fSPete Zaitcev mon_reader_add(mbus, &rp->r); 7216f23ee1fSPete Zaitcev 7226f23ee1fSPete Zaitcev file->private_data = rp; 7236f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 7246f23ee1fSPete Zaitcev return 0; 7256f23ee1fSPete Zaitcev 7266f23ee1fSPete Zaitcev err_allocbuff: 7276f23ee1fSPete Zaitcev kfree(rp->b_vec); 7286f23ee1fSPete Zaitcev err_allocvec: 7296f23ee1fSPete Zaitcev kfree(rp); 7306f23ee1fSPete Zaitcev err_alloc: 7316f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 7326f23ee1fSPete Zaitcev return rc; 7336f23ee1fSPete Zaitcev } 7346f23ee1fSPete Zaitcev 7356f23ee1fSPete Zaitcev /* 7366f23ee1fSPete Zaitcev * Extract an event from buffer and copy it to user space. 7376f23ee1fSPete Zaitcev * Wait if there is no event ready. 7386f23ee1fSPete Zaitcev * Returns zero or error. 7396f23ee1fSPete Zaitcev */ 7406f23ee1fSPete Zaitcev static int mon_bin_get_event(struct file *file, struct mon_reader_bin *rp, 741471c604dSPete Zaitcev struct mon_bin_hdr __user *hdr, unsigned int hdrbytes, 742471c604dSPete Zaitcev void __user *data, unsigned int nbytes) 7436f23ee1fSPete Zaitcev { 7446f23ee1fSPete Zaitcev unsigned long flags; 7456f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 7466f23ee1fSPete Zaitcev size_t step_len; 7476f23ee1fSPete Zaitcev unsigned int offset; 7486f23ee1fSPete Zaitcev int rc; 7496f23ee1fSPete Zaitcev 7506f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 7516f23ee1fSPete Zaitcev 7526f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 7536f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7546f23ee1fSPete Zaitcev return rc; 7556f23ee1fSPete Zaitcev } 7566f23ee1fSPete Zaitcev 7576f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 7586f23ee1fSPete Zaitcev 759471c604dSPete Zaitcev if (copy_to_user(hdr, ep, hdrbytes)) { 7606f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7616f23ee1fSPete Zaitcev return -EFAULT; 7626f23ee1fSPete Zaitcev } 7636f23ee1fSPete Zaitcev 7646f23ee1fSPete Zaitcev step_len = min(ep->len_cap, nbytes); 7656f23ee1fSPete Zaitcev if ((offset = rp->b_out + PKT_SIZE) >= rp->b_size) offset = 0; 7666f23ee1fSPete Zaitcev 7676f23ee1fSPete Zaitcev if (copy_from_buf(rp, offset, data, step_len)) { 7686f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7696f23ee1fSPete Zaitcev return -EFAULT; 7706f23ee1fSPete Zaitcev } 7716f23ee1fSPete Zaitcev 7726f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 7736f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 7746f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 7756f23ee1fSPete Zaitcev rp->b_read = 0; 7766f23ee1fSPete Zaitcev 7776f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 7786f23ee1fSPete Zaitcev return 0; 7796f23ee1fSPete Zaitcev } 7806f23ee1fSPete Zaitcev 7816f23ee1fSPete Zaitcev static int mon_bin_release(struct inode *inode, struct file *file) 7826f23ee1fSPete Zaitcev { 7836f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 7846f23ee1fSPete Zaitcev struct mon_bus* mbus = rp->r.m_bus; 7856f23ee1fSPete Zaitcev 7866f23ee1fSPete Zaitcev mutex_lock(&mon_lock); 7876f23ee1fSPete Zaitcev 7886f23ee1fSPete Zaitcev if (mbus->nreaders <= 0) { 7896f23ee1fSPete Zaitcev printk(KERN_ERR TAG ": consistency error on close\n"); 7906f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 7916f23ee1fSPete Zaitcev return 0; 7926f23ee1fSPete Zaitcev } 7936f23ee1fSPete Zaitcev mon_reader_del(mbus, &rp->r); 7946f23ee1fSPete Zaitcev 7956f23ee1fSPete Zaitcev mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); 7966f23ee1fSPete Zaitcev kfree(rp->b_vec); 7976f23ee1fSPete Zaitcev kfree(rp); 7986f23ee1fSPete Zaitcev 7996f23ee1fSPete Zaitcev mutex_unlock(&mon_lock); 8006f23ee1fSPete Zaitcev return 0; 8016f23ee1fSPete Zaitcev } 8026f23ee1fSPete Zaitcev 8036f23ee1fSPete Zaitcev static ssize_t mon_bin_read(struct file *file, char __user *buf, 8046f23ee1fSPete Zaitcev size_t nbytes, loff_t *ppos) 8056f23ee1fSPete Zaitcev { 8066f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 807471c604dSPete Zaitcev unsigned int hdrbytes = PKT_SZ_API0; 8086f23ee1fSPete Zaitcev unsigned long flags; 8096f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 8106f23ee1fSPete Zaitcev unsigned int offset; 8116f23ee1fSPete Zaitcev size_t step_len; 8126f23ee1fSPete Zaitcev char *ptr; 8136f23ee1fSPete Zaitcev ssize_t done = 0; 8146f23ee1fSPete Zaitcev int rc; 8156f23ee1fSPete Zaitcev 8166f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 8176f23ee1fSPete Zaitcev 8186f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 8196f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8206f23ee1fSPete Zaitcev return rc; 8216f23ee1fSPete Zaitcev } 8226f23ee1fSPete Zaitcev 8236f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 8246f23ee1fSPete Zaitcev 825471c604dSPete Zaitcev if (rp->b_read < hdrbytes) { 826471c604dSPete Zaitcev step_len = min(nbytes, (size_t)(hdrbytes - rp->b_read)); 8276f23ee1fSPete Zaitcev ptr = ((char *)ep) + rp->b_read; 8286f23ee1fSPete Zaitcev if (step_len && copy_to_user(buf, ptr, step_len)) { 8296f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8306f23ee1fSPete Zaitcev return -EFAULT; 8316f23ee1fSPete Zaitcev } 8326f23ee1fSPete Zaitcev nbytes -= step_len; 8336f23ee1fSPete Zaitcev buf += step_len; 8346f23ee1fSPete Zaitcev rp->b_read += step_len; 8356f23ee1fSPete Zaitcev done += step_len; 8366f23ee1fSPete Zaitcev } 8376f23ee1fSPete Zaitcev 838471c604dSPete Zaitcev if (rp->b_read >= hdrbytes) { 839f1c0a2a3SPete Zaitcev step_len = ep->len_cap; 840471c604dSPete Zaitcev step_len -= rp->b_read - hdrbytes; 841f1c0a2a3SPete Zaitcev if (step_len > nbytes) 842f1c0a2a3SPete Zaitcev step_len = nbytes; 8436f23ee1fSPete Zaitcev offset = rp->b_out + PKT_SIZE; 844471c604dSPete Zaitcev offset += rp->b_read - hdrbytes; 8456f23ee1fSPete Zaitcev if (offset >= rp->b_size) 8466f23ee1fSPete Zaitcev offset -= rp->b_size; 8476f23ee1fSPete Zaitcev if (copy_from_buf(rp, offset, buf, step_len)) { 8486f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8496f23ee1fSPete Zaitcev return -EFAULT; 8506f23ee1fSPete Zaitcev } 8516f23ee1fSPete Zaitcev nbytes -= step_len; 8526f23ee1fSPete Zaitcev buf += step_len; 8536f23ee1fSPete Zaitcev rp->b_read += step_len; 8546f23ee1fSPete Zaitcev done += step_len; 8556f23ee1fSPete Zaitcev } 8566f23ee1fSPete Zaitcev 8576f23ee1fSPete Zaitcev /* 8586f23ee1fSPete Zaitcev * Check if whole packet was read, and if so, jump to the next one. 8596f23ee1fSPete Zaitcev */ 860471c604dSPete Zaitcev if (rp->b_read >= hdrbytes + ep->len_cap) { 8616f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8626f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 8636f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8646f23ee1fSPete Zaitcev rp->b_read = 0; 8656f23ee1fSPete Zaitcev } 8666f23ee1fSPete Zaitcev 8676f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8686f23ee1fSPete Zaitcev return done; 8696f23ee1fSPete Zaitcev } 8706f23ee1fSPete Zaitcev 8716f23ee1fSPete Zaitcev /* 8726f23ee1fSPete Zaitcev * Remove at most nevents from chunked buffer. 8736f23ee1fSPete Zaitcev * Returns the number of removed events. 8746f23ee1fSPete Zaitcev */ 8756f23ee1fSPete Zaitcev static int mon_bin_flush(struct mon_reader_bin *rp, unsigned nevents) 8766f23ee1fSPete Zaitcev { 8776f23ee1fSPete Zaitcev unsigned long flags; 8786f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 8796f23ee1fSPete Zaitcev int i; 8806f23ee1fSPete Zaitcev 8816f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 8826f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 8836f23ee1fSPete Zaitcev for (i = 0; i < nevents; ++i) { 8846f23ee1fSPete Zaitcev if (MON_RING_EMPTY(rp)) 8856f23ee1fSPete Zaitcev break; 8866f23ee1fSPete Zaitcev 8876f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 8886f23ee1fSPete Zaitcev mon_buff_area_free(rp, PKT_SIZE + ep->len_cap); 8896f23ee1fSPete Zaitcev } 8906f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 8916f23ee1fSPete Zaitcev rp->b_read = 0; 8926f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 8936f23ee1fSPete Zaitcev return i; 8946f23ee1fSPete Zaitcev } 8956f23ee1fSPete Zaitcev 8966f23ee1fSPete Zaitcev /* 8976f23ee1fSPete Zaitcev * Fetch at most max event offsets into the buffer and put them into vec. 8986f23ee1fSPete Zaitcev * The events are usually freed later with mon_bin_flush. 8996f23ee1fSPete Zaitcev * Return the effective number of events fetched. 9006f23ee1fSPete Zaitcev */ 9016f23ee1fSPete Zaitcev static int mon_bin_fetch(struct file *file, struct mon_reader_bin *rp, 9026f23ee1fSPete Zaitcev u32 __user *vec, unsigned int max) 9036f23ee1fSPete Zaitcev { 9046f23ee1fSPete Zaitcev unsigned int cur_out; 9056f23ee1fSPete Zaitcev unsigned int bytes, avail; 9066f23ee1fSPete Zaitcev unsigned int size; 9076f23ee1fSPete Zaitcev unsigned int nevents; 9086f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 9096f23ee1fSPete Zaitcev unsigned long flags; 9106f23ee1fSPete Zaitcev int rc; 9116f23ee1fSPete Zaitcev 9126f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 9136f23ee1fSPete Zaitcev 9146f23ee1fSPete Zaitcev if ((rc = mon_bin_wait_event(file, rp)) < 0) { 9156f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 9166f23ee1fSPete Zaitcev return rc; 9176f23ee1fSPete Zaitcev } 9186f23ee1fSPete Zaitcev 9196f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 9206f23ee1fSPete Zaitcev avail = rp->b_cnt; 9216f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 9226f23ee1fSPete Zaitcev 9236f23ee1fSPete Zaitcev cur_out = rp->b_out; 9246f23ee1fSPete Zaitcev nevents = 0; 9256f23ee1fSPete Zaitcev bytes = 0; 9266f23ee1fSPete Zaitcev while (bytes < avail) { 9276f23ee1fSPete Zaitcev if (nevents >= max) 9286f23ee1fSPete Zaitcev break; 9296f23ee1fSPete Zaitcev 9306f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, cur_out); 9316f23ee1fSPete Zaitcev if (put_user(cur_out, &vec[nevents])) { 9326f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 9336f23ee1fSPete Zaitcev return -EFAULT; 9346f23ee1fSPete Zaitcev } 9356f23ee1fSPete Zaitcev 9366f23ee1fSPete Zaitcev nevents++; 9376f23ee1fSPete Zaitcev size = ep->len_cap + PKT_SIZE; 9386f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 9396f23ee1fSPete Zaitcev if ((cur_out += size) >= rp->b_size) 9406f23ee1fSPete Zaitcev cur_out -= rp->b_size; 9416f23ee1fSPete Zaitcev bytes += size; 9426f23ee1fSPete Zaitcev } 9436f23ee1fSPete Zaitcev 9446f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 9456f23ee1fSPete Zaitcev return nevents; 9466f23ee1fSPete Zaitcev } 9476f23ee1fSPete Zaitcev 9486f23ee1fSPete Zaitcev /* 9496f23ee1fSPete Zaitcev * Count events. This is almost the same as the above mon_bin_fetch, 9506f23ee1fSPete Zaitcev * only we do not store offsets into user vector, and we have no limit. 9516f23ee1fSPete Zaitcev */ 9526f23ee1fSPete Zaitcev static int mon_bin_queued(struct mon_reader_bin *rp) 9536f23ee1fSPete Zaitcev { 9546f23ee1fSPete Zaitcev unsigned int cur_out; 9556f23ee1fSPete Zaitcev unsigned int bytes, avail; 9566f23ee1fSPete Zaitcev unsigned int size; 9576f23ee1fSPete Zaitcev unsigned int nevents; 9586f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 9596f23ee1fSPete Zaitcev unsigned long flags; 9606f23ee1fSPete Zaitcev 9616f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 9626f23ee1fSPete Zaitcev 9636f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 9646f23ee1fSPete Zaitcev avail = rp->b_cnt; 9656f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 9666f23ee1fSPete Zaitcev 9676f23ee1fSPete Zaitcev cur_out = rp->b_out; 9686f23ee1fSPete Zaitcev nevents = 0; 9696f23ee1fSPete Zaitcev bytes = 0; 9706f23ee1fSPete Zaitcev while (bytes < avail) { 9716f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, cur_out); 9726f23ee1fSPete Zaitcev 9736f23ee1fSPete Zaitcev nevents++; 9746f23ee1fSPete Zaitcev size = ep->len_cap + PKT_SIZE; 9756f23ee1fSPete Zaitcev size = (size + PKT_ALIGN-1) & ~(PKT_ALIGN-1); 9766f23ee1fSPete Zaitcev if ((cur_out += size) >= rp->b_size) 9776f23ee1fSPete Zaitcev cur_out -= rp->b_size; 9786f23ee1fSPete Zaitcev bytes += size; 9796f23ee1fSPete Zaitcev } 9806f23ee1fSPete Zaitcev 9816f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 9826f23ee1fSPete Zaitcev return nevents; 9836f23ee1fSPete Zaitcev } 9846f23ee1fSPete Zaitcev 9856f23ee1fSPete Zaitcev /* 9866f23ee1fSPete Zaitcev */ 9873b759c75SArnd Bergmann static long mon_bin_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 9886f23ee1fSPete Zaitcev { 9896f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 9906f23ee1fSPete Zaitcev // struct mon_bus* mbus = rp->r.m_bus; 9916f23ee1fSPete Zaitcev int ret = 0; 9926f23ee1fSPete Zaitcev struct mon_bin_hdr *ep; 9936f23ee1fSPete Zaitcev unsigned long flags; 9946f23ee1fSPete Zaitcev 9956f23ee1fSPete Zaitcev switch (cmd) { 9966f23ee1fSPete Zaitcev 9976f23ee1fSPete Zaitcev case MON_IOCQ_URB_LEN: 9986f23ee1fSPete Zaitcev /* 9996f23ee1fSPete Zaitcev * N.B. This only returns the size of data, without the header. 10006f23ee1fSPete Zaitcev */ 10016f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 10026f23ee1fSPete Zaitcev if (!MON_RING_EMPTY(rp)) { 10036f23ee1fSPete Zaitcev ep = MON_OFF2HDR(rp, rp->b_out); 10046f23ee1fSPete Zaitcev ret = ep->len_cap; 10056f23ee1fSPete Zaitcev } 10066f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 10076f23ee1fSPete Zaitcev break; 10086f23ee1fSPete Zaitcev 10096f23ee1fSPete Zaitcev case MON_IOCQ_RING_SIZE: 101046eb14a6SPete Zaitcev mutex_lock(&rp->fetch_lock); 10116f23ee1fSPete Zaitcev ret = rp->b_size; 101246eb14a6SPete Zaitcev mutex_unlock(&rp->fetch_lock); 10136f23ee1fSPete Zaitcev break; 10146f23ee1fSPete Zaitcev 10156f23ee1fSPete Zaitcev case MON_IOCT_RING_SIZE: 10166f23ee1fSPete Zaitcev /* 10176f23ee1fSPete Zaitcev * Changing the buffer size will flush it's contents; the new 10186f23ee1fSPete Zaitcev * buffer is allocated before releasing the old one to be sure 10196f23ee1fSPete Zaitcev * the device will stay functional also in case of memory 10206f23ee1fSPete Zaitcev * pressure. 10216f23ee1fSPete Zaitcev */ 10226f23ee1fSPete Zaitcev { 10236f23ee1fSPete Zaitcev int size; 10246f23ee1fSPete Zaitcev struct mon_pgmap *vec; 10256f23ee1fSPete Zaitcev 10266f23ee1fSPete Zaitcev if (arg < BUFF_MIN || arg > BUFF_MAX) 10276f23ee1fSPete Zaitcev return -EINVAL; 10286f23ee1fSPete Zaitcev 10296f23ee1fSPete Zaitcev size = CHUNK_ALIGN(arg); 10306396bb22SKees Cook vec = kcalloc(size / CHUNK_SIZE, sizeof(struct mon_pgmap), 10316396bb22SKees Cook GFP_KERNEL); 10320296951aSGreg Kroah-Hartman if (vec == NULL) { 10336f23ee1fSPete Zaitcev ret = -ENOMEM; 10346f23ee1fSPete Zaitcev break; 10356f23ee1fSPete Zaitcev } 10366f23ee1fSPete Zaitcev 10376f23ee1fSPete Zaitcev ret = mon_alloc_buff(vec, size/CHUNK_SIZE); 10386f23ee1fSPete Zaitcev if (ret < 0) { 10396f23ee1fSPete Zaitcev kfree(vec); 10406f23ee1fSPete Zaitcev break; 10416f23ee1fSPete Zaitcev } 10426f23ee1fSPete Zaitcev 10436f23ee1fSPete Zaitcev mutex_lock(&rp->fetch_lock); 10446f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 104519e6317dSPete Zaitcev if (rp->mmap_active) { 104619e6317dSPete Zaitcev mon_free_buff(vec, size/CHUNK_SIZE); 104719e6317dSPete Zaitcev kfree(vec); 104819e6317dSPete Zaitcev ret = -EBUSY; 104919e6317dSPete Zaitcev } else { 105033d973adSSteven Robertson mon_free_buff(rp->b_vec, rp->b_size/CHUNK_SIZE); 10516f23ee1fSPete Zaitcev kfree(rp->b_vec); 10526f23ee1fSPete Zaitcev rp->b_vec = vec; 10536f23ee1fSPete Zaitcev rp->b_size = size; 10546f23ee1fSPete Zaitcev rp->b_read = rp->b_in = rp->b_out = rp->b_cnt = 0; 10556f23ee1fSPete Zaitcev rp->cnt_lost = 0; 105619e6317dSPete Zaitcev } 10576f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 10586f23ee1fSPete Zaitcev mutex_unlock(&rp->fetch_lock); 10596f23ee1fSPete Zaitcev } 10606f23ee1fSPete Zaitcev break; 10616f23ee1fSPete Zaitcev 10626f23ee1fSPete Zaitcev case MON_IOCH_MFLUSH: 10636f23ee1fSPete Zaitcev ret = mon_bin_flush(rp, arg); 10646f23ee1fSPete Zaitcev break; 10656f23ee1fSPete Zaitcev 10666f23ee1fSPete Zaitcev case MON_IOCX_GET: 1067471c604dSPete Zaitcev case MON_IOCX_GETX: 10686f23ee1fSPete Zaitcev { 10696f23ee1fSPete Zaitcev struct mon_bin_get getb; 10706f23ee1fSPete Zaitcev 10716f23ee1fSPete Zaitcev if (copy_from_user(&getb, (void __user *)arg, 10726f23ee1fSPete Zaitcev sizeof(struct mon_bin_get))) 10736f23ee1fSPete Zaitcev return -EFAULT; 10746f23ee1fSPete Zaitcev 10756f23ee1fSPete Zaitcev if (getb.alloc > 0x10000000) /* Want to cast to u32 */ 10766f23ee1fSPete Zaitcev return -EINVAL; 1077471c604dSPete Zaitcev ret = mon_bin_get_event(file, rp, getb.hdr, 1078471c604dSPete Zaitcev (cmd == MON_IOCX_GET)? PKT_SZ_API0: PKT_SZ_API1, 1079471c604dSPete Zaitcev getb.data, (unsigned int)getb.alloc); 10806f23ee1fSPete Zaitcev } 10816f23ee1fSPete Zaitcev break; 10826f23ee1fSPete Zaitcev 10836f23ee1fSPete Zaitcev case MON_IOCX_MFETCH: 10846f23ee1fSPete Zaitcev { 10856f23ee1fSPete Zaitcev struct mon_bin_mfetch mfetch; 10866f23ee1fSPete Zaitcev struct mon_bin_mfetch __user *uptr; 10876f23ee1fSPete Zaitcev 10886f23ee1fSPete Zaitcev uptr = (struct mon_bin_mfetch __user *)arg; 10896f23ee1fSPete Zaitcev 10906f23ee1fSPete Zaitcev if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) 10916f23ee1fSPete Zaitcev return -EFAULT; 10926f23ee1fSPete Zaitcev 10936f23ee1fSPete Zaitcev if (mfetch.nflush) { 10946f23ee1fSPete Zaitcev ret = mon_bin_flush(rp, mfetch.nflush); 10956f23ee1fSPete Zaitcev if (ret < 0) 10966f23ee1fSPete Zaitcev return ret; 10976f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nflush)) 10986f23ee1fSPete Zaitcev return -EFAULT; 10996f23ee1fSPete Zaitcev } 11006f23ee1fSPete Zaitcev ret = mon_bin_fetch(file, rp, mfetch.offvec, mfetch.nfetch); 11016f23ee1fSPete Zaitcev if (ret < 0) 11026f23ee1fSPete Zaitcev return ret; 11036f23ee1fSPete Zaitcev if (put_user(ret, &uptr->nfetch)) 11046f23ee1fSPete Zaitcev return -EFAULT; 11056f23ee1fSPete Zaitcev ret = 0; 11066f23ee1fSPete Zaitcev } 11076f23ee1fSPete Zaitcev break; 11086f23ee1fSPete Zaitcev 11096f23ee1fSPete Zaitcev case MON_IOCG_STATS: { 11106f23ee1fSPete Zaitcev struct mon_bin_stats __user *sp; 11116f23ee1fSPete Zaitcev unsigned int nevents; 11126f23ee1fSPete Zaitcev unsigned int ndropped; 11136f23ee1fSPete Zaitcev 11146f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 11156f23ee1fSPete Zaitcev ndropped = rp->cnt_lost; 11166f23ee1fSPete Zaitcev rp->cnt_lost = 0; 11176f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 11186f23ee1fSPete Zaitcev nevents = mon_bin_queued(rp); 11196f23ee1fSPete Zaitcev 11206f23ee1fSPete Zaitcev sp = (struct mon_bin_stats __user *)arg; 1121236c448cSJohannes Stezenbach if (put_user(ndropped, &sp->dropped)) 11226f23ee1fSPete Zaitcev return -EFAULT; 11236f23ee1fSPete Zaitcev if (put_user(nevents, &sp->queued)) 11246f23ee1fSPete Zaitcev return -EFAULT; 11256f23ee1fSPete Zaitcev 11266f23ee1fSPete Zaitcev } 11276f23ee1fSPete Zaitcev break; 11286f23ee1fSPete Zaitcev 11296f23ee1fSPete Zaitcev default: 11306f23ee1fSPete Zaitcev return -ENOTTY; 11316f23ee1fSPete Zaitcev } 11326f23ee1fSPete Zaitcev 11336f23ee1fSPete Zaitcev return ret; 11346f23ee1fSPete Zaitcev } 11356f23ee1fSPete Zaitcev 11367abce6beSPete Zaitcev #ifdef CONFIG_COMPAT 11377abce6beSPete Zaitcev static long mon_bin_compat_ioctl(struct file *file, 11387abce6beSPete Zaitcev unsigned int cmd, unsigned long arg) 11397abce6beSPete Zaitcev { 11407abce6beSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 11417abce6beSPete Zaitcev int ret; 11427abce6beSPete Zaitcev 11437abce6beSPete Zaitcev switch (cmd) { 11447abce6beSPete Zaitcev 1145471c604dSPete Zaitcev case MON_IOCX_GET32: 1146471c604dSPete Zaitcev case MON_IOCX_GETX32: 1147471c604dSPete Zaitcev { 11487abce6beSPete Zaitcev struct mon_bin_get32 getb; 11497abce6beSPete Zaitcev 11507abce6beSPete Zaitcev if (copy_from_user(&getb, (void __user *)arg, 11517abce6beSPete Zaitcev sizeof(struct mon_bin_get32))) 11527abce6beSPete Zaitcev return -EFAULT; 11537abce6beSPete Zaitcev 1154471c604dSPete Zaitcev ret = mon_bin_get_event(file, rp, compat_ptr(getb.hdr32), 1155471c604dSPete Zaitcev (cmd == MON_IOCX_GET32)? PKT_SZ_API0: PKT_SZ_API1, 1156471c604dSPete Zaitcev compat_ptr(getb.data32), getb.alloc32); 11577abce6beSPete Zaitcev if (ret < 0) 11587abce6beSPete Zaitcev return ret; 11597abce6beSPete Zaitcev } 11607abce6beSPete Zaitcev return 0; 11617abce6beSPete Zaitcev 11627abce6beSPete Zaitcev case MON_IOCX_MFETCH32: 11637abce6beSPete Zaitcev { 11647abce6beSPete Zaitcev struct mon_bin_mfetch32 mfetch; 11657abce6beSPete Zaitcev struct mon_bin_mfetch32 __user *uptr; 11667abce6beSPete Zaitcev 11677abce6beSPete Zaitcev uptr = (struct mon_bin_mfetch32 __user *) compat_ptr(arg); 11687abce6beSPete Zaitcev 11697abce6beSPete Zaitcev if (copy_from_user(&mfetch, uptr, sizeof(mfetch))) 11707abce6beSPete Zaitcev return -EFAULT; 11717abce6beSPete Zaitcev 11727abce6beSPete Zaitcev if (mfetch.nflush32) { 11737abce6beSPete Zaitcev ret = mon_bin_flush(rp, mfetch.nflush32); 11747abce6beSPete Zaitcev if (ret < 0) 11757abce6beSPete Zaitcev return ret; 11767abce6beSPete Zaitcev if (put_user(ret, &uptr->nflush32)) 11777abce6beSPete Zaitcev return -EFAULT; 11787abce6beSPete Zaitcev } 11797abce6beSPete Zaitcev ret = mon_bin_fetch(file, rp, compat_ptr(mfetch.offvec32), 11807abce6beSPete Zaitcev mfetch.nfetch32); 11817abce6beSPete Zaitcev if (ret < 0) 11827abce6beSPete Zaitcev return ret; 11837abce6beSPete Zaitcev if (put_user(ret, &uptr->nfetch32)) 11847abce6beSPete Zaitcev return -EFAULT; 11857abce6beSPete Zaitcev } 11867abce6beSPete Zaitcev return 0; 11877abce6beSPete Zaitcev 11887abce6beSPete Zaitcev case MON_IOCG_STATS: 118955929332SArnd Bergmann return mon_bin_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 11907abce6beSPete Zaitcev 11917abce6beSPete Zaitcev case MON_IOCQ_URB_LEN: 11927abce6beSPete Zaitcev case MON_IOCQ_RING_SIZE: 11937abce6beSPete Zaitcev case MON_IOCT_RING_SIZE: 11947abce6beSPete Zaitcev case MON_IOCH_MFLUSH: 119555929332SArnd Bergmann return mon_bin_ioctl(file, cmd, arg); 11967abce6beSPete Zaitcev 11977abce6beSPete Zaitcev default: 11987abce6beSPete Zaitcev ; 11997abce6beSPete Zaitcev } 12007abce6beSPete Zaitcev return -ENOTTY; 12017abce6beSPete Zaitcev } 12027abce6beSPete Zaitcev #endif /* CONFIG_COMPAT */ 12037abce6beSPete Zaitcev 1204afc9a42bSAl Viro static __poll_t 12056f23ee1fSPete Zaitcev mon_bin_poll(struct file *file, struct poll_table_struct *wait) 12066f23ee1fSPete Zaitcev { 12076f23ee1fSPete Zaitcev struct mon_reader_bin *rp = file->private_data; 1208afc9a42bSAl Viro __poll_t mask = 0; 12096f23ee1fSPete Zaitcev unsigned long flags; 12106f23ee1fSPete Zaitcev 12116f23ee1fSPete Zaitcev if (file->f_mode & FMODE_READ) 12126f23ee1fSPete Zaitcev poll_wait(file, &rp->b_wait, wait); 12136f23ee1fSPete Zaitcev 12146f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 12156f23ee1fSPete Zaitcev if (!MON_RING_EMPTY(rp)) 1216a9a08845SLinus Torvalds mask |= EPOLLIN | EPOLLRDNORM; /* readable */ 12176f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 12186f23ee1fSPete Zaitcev return mask; 12196f23ee1fSPete Zaitcev } 12206f23ee1fSPete Zaitcev 12216f23ee1fSPete Zaitcev /* 12226f23ee1fSPete Zaitcev * open and close: just keep track of how many times the device is 12236f23ee1fSPete Zaitcev * mapped, to use the proper memory allocation function. 12246f23ee1fSPete Zaitcev */ 12256f23ee1fSPete Zaitcev static void mon_bin_vma_open(struct vm_area_struct *vma) 12266f23ee1fSPete Zaitcev { 12276f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 122819e6317dSPete Zaitcev unsigned long flags; 122919e6317dSPete Zaitcev 123019e6317dSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 12316f23ee1fSPete Zaitcev rp->mmap_active++; 123219e6317dSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 12336f23ee1fSPete Zaitcev } 12346f23ee1fSPete Zaitcev 12356f23ee1fSPete Zaitcev static void mon_bin_vma_close(struct vm_area_struct *vma) 12366f23ee1fSPete Zaitcev { 123719e6317dSPete Zaitcev unsigned long flags; 123819e6317dSPete Zaitcev 12396f23ee1fSPete Zaitcev struct mon_reader_bin *rp = vma->vm_private_data; 124019e6317dSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 12416f23ee1fSPete Zaitcev rp->mmap_active--; 124219e6317dSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 12436f23ee1fSPete Zaitcev } 12446f23ee1fSPete Zaitcev 12456f23ee1fSPete Zaitcev /* 12466f23ee1fSPete Zaitcev * Map ring pages to user space. 12476f23ee1fSPete Zaitcev */ 124803eb4c33SSouptick Joarder static vm_fault_t mon_bin_vma_fault(struct vm_fault *vmf) 12496f23ee1fSPete Zaitcev { 125011bac800SDave Jiang struct mon_reader_bin *rp = vmf->vma->vm_private_data; 12516f23ee1fSPete Zaitcev unsigned long offset, chunk_idx; 12526f23ee1fSPete Zaitcev struct page *pageptr; 12536f23ee1fSPete Zaitcev 1254041509dbSNick Piggin offset = vmf->pgoff << PAGE_SHIFT; 125519e6317dSPete Zaitcev if (offset >= rp->b_size) 1256041509dbSNick Piggin return VM_FAULT_SIGBUS; 12576f23ee1fSPete Zaitcev chunk_idx = offset / CHUNK_SIZE; 12586f23ee1fSPete Zaitcev pageptr = rp->b_vec[chunk_idx].pg; 12596f23ee1fSPete Zaitcev get_page(pageptr); 1260041509dbSNick Piggin vmf->page = pageptr; 1261041509dbSNick Piggin return 0; 12626f23ee1fSPete Zaitcev } 12636f23ee1fSPete Zaitcev 1264f0f37e2fSAlexey Dobriyan static const struct vm_operations_struct mon_bin_vm_ops = { 12656f23ee1fSPete Zaitcev .open = mon_bin_vma_open, 12666f23ee1fSPete Zaitcev .close = mon_bin_vma_close, 1267041509dbSNick Piggin .fault = mon_bin_vma_fault, 12686f23ee1fSPete Zaitcev }; 12696f23ee1fSPete Zaitcev 1270454459b0SPete Zaitcev static int mon_bin_mmap(struct file *filp, struct vm_area_struct *vma) 12716f23ee1fSPete Zaitcev { 1272041509dbSNick Piggin /* don't do anything here: "fault" will set up page table entries */ 12736f23ee1fSPete Zaitcev vma->vm_ops = &mon_bin_vm_ops; 1274a659daf6STadeusz Struk 1275a659daf6STadeusz Struk if (vma->vm_flags & VM_WRITE) 1276a659daf6STadeusz Struk return -EPERM; 1277a659daf6STadeusz Struk 12781c71222eSSuren Baghdasaryan vm_flags_mod(vma, VM_DONTEXPAND | VM_DONTDUMP, VM_MAYWRITE); 12796f23ee1fSPete Zaitcev vma->vm_private_data = filp->private_data; 12806f23ee1fSPete Zaitcev mon_bin_vma_open(vma); 12816f23ee1fSPete Zaitcev return 0; 12826f23ee1fSPete Zaitcev } 12836f23ee1fSPete Zaitcev 12840b3f5fe6SJan Engelhardt static const struct file_operations mon_fops_binary = { 12856f23ee1fSPete Zaitcev .owner = THIS_MODULE, 12866f23ee1fSPete Zaitcev .open = mon_bin_open, 12876f23ee1fSPete Zaitcev .llseek = no_llseek, 12886f23ee1fSPete Zaitcev .read = mon_bin_read, 12896f23ee1fSPete Zaitcev /* .write = mon_text_write, */ 12906f23ee1fSPete Zaitcev .poll = mon_bin_poll, 12913b759c75SArnd Bergmann .unlocked_ioctl = mon_bin_ioctl, 12927abce6beSPete Zaitcev #ifdef CONFIG_COMPAT 12937abce6beSPete Zaitcev .compat_ioctl = mon_bin_compat_ioctl, 12947abce6beSPete Zaitcev #endif 12956f23ee1fSPete Zaitcev .release = mon_bin_release, 1296454459b0SPete Zaitcev .mmap = mon_bin_mmap, 12976f23ee1fSPete Zaitcev }; 12986f23ee1fSPete Zaitcev 12996f23ee1fSPete Zaitcev static int mon_bin_wait_event(struct file *file, struct mon_reader_bin *rp) 13006f23ee1fSPete Zaitcev { 13016f23ee1fSPete Zaitcev DECLARE_WAITQUEUE(waita, current); 13026f23ee1fSPete Zaitcev unsigned long flags; 13036f23ee1fSPete Zaitcev 13046f23ee1fSPete Zaitcev add_wait_queue(&rp->b_wait, &waita); 13056f23ee1fSPete Zaitcev set_current_state(TASK_INTERRUPTIBLE); 13066f23ee1fSPete Zaitcev 13076f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 13086f23ee1fSPete Zaitcev while (MON_RING_EMPTY(rp)) { 13096f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 13106f23ee1fSPete Zaitcev 13116f23ee1fSPete Zaitcev if (file->f_flags & O_NONBLOCK) { 13126f23ee1fSPete Zaitcev set_current_state(TASK_RUNNING); 13136f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 13146f23ee1fSPete Zaitcev return -EWOULDBLOCK; /* Same as EAGAIN in Linux */ 13156f23ee1fSPete Zaitcev } 13166f23ee1fSPete Zaitcev schedule(); 13176f23ee1fSPete Zaitcev if (signal_pending(current)) { 13186f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 13196f23ee1fSPete Zaitcev return -EINTR; 13206f23ee1fSPete Zaitcev } 13216f23ee1fSPete Zaitcev set_current_state(TASK_INTERRUPTIBLE); 13226f23ee1fSPete Zaitcev 13236f23ee1fSPete Zaitcev spin_lock_irqsave(&rp->b_lock, flags); 13246f23ee1fSPete Zaitcev } 13256f23ee1fSPete Zaitcev spin_unlock_irqrestore(&rp->b_lock, flags); 13266f23ee1fSPete Zaitcev 13276f23ee1fSPete Zaitcev set_current_state(TASK_RUNNING); 13286f23ee1fSPete Zaitcev remove_wait_queue(&rp->b_wait, &waita); 13296f23ee1fSPete Zaitcev return 0; 13306f23ee1fSPete Zaitcev } 13316f23ee1fSPete Zaitcev 13326f23ee1fSPete Zaitcev static int mon_alloc_buff(struct mon_pgmap *map, int npages) 13336f23ee1fSPete Zaitcev { 13346f23ee1fSPete Zaitcev int n; 13356f23ee1fSPete Zaitcev unsigned long vaddr; 13366f23ee1fSPete Zaitcev 13376f23ee1fSPete Zaitcev for (n = 0; n < npages; n++) { 13386f23ee1fSPete Zaitcev vaddr = get_zeroed_page(GFP_KERNEL); 13396f23ee1fSPete Zaitcev if (vaddr == 0) { 13406f23ee1fSPete Zaitcev while (n-- != 0) 13416f23ee1fSPete Zaitcev free_page((unsigned long) map[n].ptr); 13426f23ee1fSPete Zaitcev return -ENOMEM; 13436f23ee1fSPete Zaitcev } 13446f23ee1fSPete Zaitcev map[n].ptr = (unsigned char *) vaddr; 13455bfd7560SKevin Cernekee map[n].pg = virt_to_page((void *) vaddr); 13466f23ee1fSPete Zaitcev } 13476f23ee1fSPete Zaitcev return 0; 13486f23ee1fSPete Zaitcev } 13496f23ee1fSPete Zaitcev 13506f23ee1fSPete Zaitcev static void mon_free_buff(struct mon_pgmap *map, int npages) 13516f23ee1fSPete Zaitcev { 13526f23ee1fSPete Zaitcev int n; 13536f23ee1fSPete Zaitcev 13546f23ee1fSPete Zaitcev for (n = 0; n < npages; n++) 13556f23ee1fSPete Zaitcev free_page((unsigned long) map[n].ptr); 13566f23ee1fSPete Zaitcev } 13576f23ee1fSPete Zaitcev 1358ce7cd137SPete Zaitcev int mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus) 1359ce7cd137SPete Zaitcev { 1360ce7cd137SPete Zaitcev struct device *dev; 1361ce7cd137SPete Zaitcev unsigned minor = ubus? ubus->busnum: 0; 1362ce7cd137SPete Zaitcev 1363ce7cd137SPete Zaitcev if (minor >= MON_BIN_MAX_MINOR) 1364ce7cd137SPete Zaitcev return 0; 1365ce7cd137SPete Zaitcev 1366*e571e843SIvan Orlov dev = device_create(&mon_bin_class, ubus ? ubus->controller : NULL, 1367bc00bc92SGreg Kroah-Hartman MKDEV(MAJOR(mon_bin_dev0), minor), NULL, 1368bc00bc92SGreg Kroah-Hartman "usbmon%d", minor); 1369ce7cd137SPete Zaitcev if (IS_ERR(dev)) 1370ce7cd137SPete Zaitcev return 0; 1371ce7cd137SPete Zaitcev 1372ce7cd137SPete Zaitcev mbus->classdev = dev; 1373ce7cd137SPete Zaitcev return 1; 1374ce7cd137SPete Zaitcev } 1375ce7cd137SPete Zaitcev 1376ce7cd137SPete Zaitcev void mon_bin_del(struct mon_bus *mbus) 1377ce7cd137SPete Zaitcev { 1378*e571e843SIvan Orlov device_destroy(&mon_bin_class, mbus->classdev->devt); 1379ce7cd137SPete Zaitcev } 1380ce7cd137SPete Zaitcev 13816f23ee1fSPete Zaitcev int __init mon_bin_init(void) 13826f23ee1fSPete Zaitcev { 13836f23ee1fSPete Zaitcev int rc; 13846f23ee1fSPete Zaitcev 1385*e571e843SIvan Orlov rc = class_register(&mon_bin_class); 1386*e571e843SIvan Orlov if (rc) 1387ce7cd137SPete Zaitcev goto err_class; 1388ce7cd137SPete Zaitcev 13896f23ee1fSPete Zaitcev rc = alloc_chrdev_region(&mon_bin_dev0, 0, MON_BIN_MAX_MINOR, "usbmon"); 13906f23ee1fSPete Zaitcev if (rc < 0) 13916f23ee1fSPete Zaitcev goto err_dev; 13926f23ee1fSPete Zaitcev 13936f23ee1fSPete Zaitcev cdev_init(&mon_bin_cdev, &mon_fops_binary); 13946f23ee1fSPete Zaitcev mon_bin_cdev.owner = THIS_MODULE; 13956f23ee1fSPete Zaitcev 13966f23ee1fSPete Zaitcev rc = cdev_add(&mon_bin_cdev, mon_bin_dev0, MON_BIN_MAX_MINOR); 13976f23ee1fSPete Zaitcev if (rc < 0) 13986f23ee1fSPete Zaitcev goto err_add; 13996f23ee1fSPete Zaitcev 14006f23ee1fSPete Zaitcev return 0; 14016f23ee1fSPete Zaitcev 14026f23ee1fSPete Zaitcev err_add: 14036f23ee1fSPete Zaitcev unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); 14046f23ee1fSPete Zaitcev err_dev: 1405*e571e843SIvan Orlov class_unregister(&mon_bin_class); 1406ce7cd137SPete Zaitcev err_class: 14076f23ee1fSPete Zaitcev return rc; 14086f23ee1fSPete Zaitcev } 14096f23ee1fSPete Zaitcev 141021641e3fSPete Zaitcev void mon_bin_exit(void) 14116f23ee1fSPete Zaitcev { 14126f23ee1fSPete Zaitcev cdev_del(&mon_bin_cdev); 14136f23ee1fSPete Zaitcev unregister_chrdev_region(mon_bin_dev0, MON_BIN_MAX_MINOR); 1414*e571e843SIvan Orlov class_unregister(&mon_bin_class); 14156f23ee1fSPete Zaitcev } 1416