/* * tcpprobe - Observe the TCP flow with kprobes. * * The idea for this came from Werner Almesberger's umlsim * Copyright (C) 2004, Stephen Hemminger * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("Stephen Hemminger "); MODULE_DESCRIPTION("TCP cwnd snooper"); MODULE_LICENSE("GPL"); MODULE_VERSION("1.1"); static int port __read_mostly; MODULE_PARM_DESC(port, "Port to match (0=all)"); module_param(port, int, 0); static unsigned int bufsize __read_mostly = 4096; MODULE_PARM_DESC(bufsize, "Log buffer size in packets (4096)"); module_param(bufsize, uint, 0); static unsigned int fwmark __read_mostly; MODULE_PARM_DESC(fwmark, "skb mark to match (0=no mark)"); module_param(fwmark, uint, 0); static int full __read_mostly; MODULE_PARM_DESC(full, "Full log (1=every ack packet received, 0=only cwnd changes)"); module_param(full, int, 0); static const char procname[] = "tcpprobe"; struct tcp_log { ktime_t tstamp; union { struct sockaddr raw; struct sockaddr_in v4; struct sockaddr_in6 v6; } src, dst; u16 length; u32 snd_nxt; u32 snd_una; u32 snd_wnd; u32 rcv_wnd; u32 snd_cwnd; u32 ssthresh; u32 srtt; }; static struct { spinlock_t lock; wait_queue_head_t wait; ktime_t start; u32 lastcwnd; unsigned long head, tail; struct tcp_log *log; } tcp_probe; static inline int tcp_probe_used(void) { return (tcp_probe.head - tcp_probe.tail) & (bufsize - 1); } static inline int tcp_probe_avail(void) { return bufsize - tcp_probe_used() - 1; } #define tcp_probe_copy_fl_to_si4(inet, si4, mem) \ do { \ si4.sin_family = AF_INET; \ si4.sin_port = inet->inet_##mem##port; \ si4.sin_addr.s_addr = inet->inet_##mem##addr; \ } while (0) \ /* * Hook inserted to be called before each receive packet. * Note: arguments must match tcp_rcv_established()! */ static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb, const struct tcphdr *th, unsigned int len) { const struct tcp_sock *tp = tcp_sk(sk); const struct inet_sock *inet = inet_sk(sk); /* Only update if port or skb mark matches */ if (((port == 0 && fwmark == 0) || ntohs(inet->inet_dport) == port || ntohs(inet->inet_sport) == port || (fwmark > 0 && skb->mark == fwmark)) && (full || tp->snd_cwnd != tcp_probe.lastcwnd)) { spin_lock(&tcp_probe.lock); /* If log fills, just silently drop */ if (tcp_probe_avail() > 1) { struct tcp_log *p = tcp_probe.log + tcp_probe.head; p->tstamp = ktime_get(); switch (sk->sk_family) { case AF_INET: tcp_probe_copy_fl_to_si4(inet, p->src.v4, s); tcp_probe_copy_fl_to_si4(inet, p->dst.v4, d); break; case AF_INET6: memset(&p->src.v6, 0, sizeof(p->src.v6)); memset(&p->dst.v6, 0, sizeof(p->dst.v6)); #if IS_ENABLED(CONFIG_IPV6) p->src.v6.sin6_family = AF_INET6; p->src.v6.sin6_port = inet->inet_sport; p->src.v6.sin6_addr = inet6_sk(sk)->saddr; p->dst.v6.sin6_family = AF_INET6; p->dst.v6.sin6_port = inet->inet_dport; p->dst.v6.sin6_addr = sk->sk_v6_daddr; #endif break; default: BUG(); } p->length = skb->len; p->snd_nxt = tp->snd_nxt; p->snd_una = tp->snd_una; p->snd_cwnd = tp->snd_cwnd; p->snd_wnd = tp->snd_wnd; p->rcv_wnd = tp->rcv_wnd; p->ssthresh = tcp_current_ssthresh(sk); p->srtt = tp->srtt_us >> 3; tcp_probe.head = (tcp_probe.head + 1) & (bufsize - 1); } tcp_probe.lastcwnd = tp->snd_cwnd; spin_unlock(&tcp_probe.lock); wake_up(&tcp_probe.wait); } jprobe_return(); } static struct jprobe tcp_jprobe = { .kp = { .symbol_name = "tcp_rcv_established", }, .entry = jtcp_rcv_established, }; static int tcpprobe_open(struct inode *inode, struct file *file) { /* Reset (empty) log */ spin_lock_bh(&tcp_probe.lock); tcp_probe.head = tcp_probe.tail = 0; tcp_probe.start = ktime_get(); spin_unlock_bh(&tcp_probe.lock); return 0; } static int tcpprobe_sprint(char *tbuf, int n) { const struct tcp_log *p = tcp_probe.log + tcp_probe.tail; struct timespec64 ts = ktime_to_timespec64(ktime_sub(p->tstamp, tcp_probe.start)); return scnprintf(tbuf, n, "%lu.%09lu %pISpc %pISpc %d %#x %#x %u %u %u %u %u\n", (unsigned long)ts.tv_sec, (unsigned long)ts.tv_nsec, &p->src, &p->dst, p->length, p->snd_nxt, p->snd_una, p->snd_cwnd, p->ssthresh, p->snd_wnd, p->srtt, p->rcv_wnd); } static ssize_t tcpprobe_read(struct file *file, char __user *buf, size_t len, loff_t *ppos) { int error = 0; size_t cnt = 0; if (!buf) return -EINVAL; while (cnt < len) { char tbuf[256]; int width; /* Wait for data in buffer */ error = wait_event_interruptible(tcp_probe.wait, tcp_probe_used() > 0); if (error) break; spin_lock_bh(&tcp_probe.lock); if (tcp_probe.head == tcp_probe.tail) { /* multiple readers race? */ spin_unlock_bh(&tcp_probe.lock); continue; } width = tcpprobe_sprint(tbuf, sizeof(tbuf)); if (cnt + width < len) tcp_probe.tail = (tcp_probe.tail + 1) & (bufsize - 1); spin_unlock_bh(&tcp_probe.lock); /* if record greater than space available return partial buffer (so far) */ if (cnt + width >= len) break; if (copy_to_user(buf + cnt, tbuf, width)) return -EFAULT; cnt += width; } return cnt == 0 ? error : cnt; } static const struct file_operations tcpprobe_fops = { .owner = THIS_MODULE, .open = tcpprobe_open, .read = tcpprobe_read, .llseek = noop_llseek, }; static __init int tcpprobe_init(void) { int ret = -ENOMEM; /* Warning: if the function signature of tcp_rcv_established, * has been changed, you also have to change the signature of * jtcp_rcv_established, otherwise you end up right here! */ BUILD_BUG_ON(__same_type(tcp_rcv_established, jtcp_rcv_established) == 0); init_waitqueue_head(&tcp_probe.wait); spin_lock_init(&tcp_probe.lock); if (bufsize == 0) return -EINVAL; bufsize = roundup_pow_of_two(bufsize); tcp_probe.log = kcalloc(bufsize, sizeof(struct tcp_log), GFP_KERNEL); if (!tcp_probe.log) goto err0; if (!proc_create(procname, S_IRUSR, init_net.proc_net, &tcpprobe_fops)) goto err0; ret = register_jprobe(&tcp_jprobe); if (ret) goto err1; pr_info("probe registered (port=%d/fwmark=%u) bufsize=%u\n", port, fwmark, bufsize); return 0; err1: remove_proc_entry(procname, init_net.proc_net); err0: kfree(tcp_probe.log); return ret; } module_init(tcpprobe_init); static __exit void tcpprobe_exit(void) { remove_proc_entry(procname, init_net.proc_net); unregister_jprobe(&tcp_jprobe); kfree(tcp_probe.log); } module_exit(tcpprobe_exit); 0x285/0x2f0 [drm_kms_helper] intel_atomic_commit+0x35/0x4f0 [i915] drm_atomic_commit+0x46/0x50 [drm] drm_mode_atomic_ioctl+0x7d4/0xab0 [drm] drm_ioctl+0x2b3/0x490 [drm] do_vfs_ioctl+0x69c/0x700 SyS_ioctl+0x4e/0x80 entry_SYSCALL_64_fastpath+0x13/0x94 INFO: Freed in drm_event_cancel_free+0xa3/0xb0 [drm] age=0 cpu=3 pid=1529 __slab_free+0x48/0x2e0 kfree+0x159/0x1a0 drm_event_cancel_free+0xa3/0xb0 [drm] drm_mode_atomic_ioctl+0x86d/0xab0 [drm] drm_ioctl+0x2b3/0x490 [drm] do_vfs_ioctl+0x69c/0x700 SyS_ioctl+0x4e/0x80 entry_SYSCALL_64_fastpath+0x13/0x94 INFO: Slab 0xffffde1f0997b080 objects=17 used=2 fp=0xffff92fb65ec2578 flags=0x200000000008101 INFO: Object 0xffff92fb65ec2578 @offset=1400 fp=0xffff92fb65ec2ae8 Redzone ffff92fb65ec2570: bb bb bb bb bb bb bb bb ........ Object ffff92fb65ec2578: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec2588: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec2598: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25a8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25b8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25c8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25d8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff92fb65ec25e8: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk. Redzone ffff92fb65ec25f8: bb bb bb bb bb bb bb bb ........ Padding ffff92fb65ec2738: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ CPU: 3 PID: 180 Comm: kworker/3:2 Tainted: G BU 4.10.0-rc6-patser+ #5039 Hardware name: /NUC5PPYB, BIOS PYBSWCEL.86A.0031.2015.0601.1712 06/01/2015 Workqueue: events intel_atomic_helper_free_state [i915] Call Trace: dump_stack+0x4d/0x6d print_trailer+0x20c/0x220 free_debug_processing+0x1c6/0x330 ? drm_atomic_state_default_clear+0xf7/0x1c0 [drm] __slab_free+0x48/0x2e0 ? drm_atomic_state_default_clear+0xf7/0x1c0 [drm] kfree+0x159/0x1a0 drm_atomic_state_default_clear+0xf7/0x1c0 [drm] ? drm_atomic_state_clear+0x30/0x30 [drm] intel_atomic_state_clear+0xd/0x20 [i915] drm_atomic_state_clear+0x1a/0x30 [drm] __drm_atomic_state_free+0x13/0x60 [drm] intel_atomic_helper_free_state+0x5d/0x70 [i915] process_one_work+0x260/0x4a0 worker_thread+0x2d1/0x4f0 kthread+0x127/0x130 ? process_one_work+0x4a0/0x4a0 ? kthread_stop+0x120/0x120 ret_from_fork+0x29/0x40 FIX kmalloc-128: Object at 0xffff92fb65ec2578 not freed Fixes: 3b24f7d67581 ("drm/atomic: Add struct drm_crtc_commit to track async updates") Fixes: 9626014258a5 ("drm/fence: add in-fences support") Cc: <stable@vger.kernel.org> # v4.8+ Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1485854725-27640-1-git-send-email-maarten.lankhorst@linux.intel.com
Diffstat (limited to 'include/dt-bindings/pinctrl/at91.h')