X-Git-Url: http://git.lttng.org/?p=lttng-modules.git;a=blobdiff_plain;f=lttng-statedump-impl.c;h=f3ae1937b1faa5da94683d891311bc1013eb1bb8;hp=d0e641a97ca70452508ccf618ebf9c594b67cb5b;hb=HEAD;hpb=cfcee1c794ba05c6f7e4b0f7e630f9ca5cba935f

diff --git a/lttng-statedump-impl.c b/lttng-statedump-impl.c
deleted file mode 100644
index d0e641a9..00000000
--- a/lttng-statedump-impl.c
+++ /dev/null
@@ -1,553 +0,0 @@
-/*
- * lttng-statedump.c
- *
- * Linux Trace Toolkit Next Generation Kernel State Dump
- *
- * Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca>
- * Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Changes:
- *	Eric Clement:                   Add listing of network IP interface
- *	2006, 2007 Mathieu Desnoyers	Fix kernel threads
- *	                                Various updates
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/netlink.h>
-#include <linux/inet.h>
-#include <linux/ip.h>
-#include <linux/kthread.h>
-#include <linux/proc_fs.h>
-#include <linux/file.h>
-#include <linux/interrupt.h>
-#include <linux/irqnr.h>
-#include <linux/cpu.h>
-#include <linux/netdevice.h>
-#include <linux/inetdevice.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/fdtable.h>
-#include <linux/swap.h>
-#include <linux/wait.h>
-#include <linux/mutex.h>
-#include <linux/device.h>
-
-#include "lttng-events.h"
-#include "lttng-tracer.h"
-#include "wrapper/irqdesc.h"
-#include "wrapper/spinlock.h"
-#include "wrapper/fdtable.h"
-#include "wrapper/nsproxy.h"
-#include "wrapper/irq.h"
-#include "wrapper/tracepoint.h"
-#include "wrapper/genhd.h"
-
-#ifdef CONFIG_LTTNG_HAS_LIST_IRQ
-#include <linux/irq.h>
-#endif
-
-/* Define the tracepoints, but do not build the probes */
-#define CREATE_TRACE_POINTS
-#define TRACE_INCLUDE_PATH ../instrumentation/events/lttng-module
-#define TRACE_INCLUDE_FILE lttng-statedump
-#include "instrumentation/events/lttng-module/lttng-statedump.h"
-
-DEFINE_TRACE(lttng_statedump_block_device);
-DEFINE_TRACE(lttng_statedump_end);
-DEFINE_TRACE(lttng_statedump_interrupt);
-DEFINE_TRACE(lttng_statedump_file_descriptor);
-DEFINE_TRACE(lttng_statedump_start);
-DEFINE_TRACE(lttng_statedump_process_state);
-DEFINE_TRACE(lttng_statedump_network_interface);
-
-struct lttng_fd_ctx {
-	char *page;
-	struct lttng_session *session;
-	struct task_struct *p;
-	struct fdtable *fdt;
-};
-
-/*
- * Protected by the trace lock.
- */
-static struct delayed_work cpu_work[NR_CPUS];
-static DECLARE_WAIT_QUEUE_HEAD(statedump_wq);
-static atomic_t kernel_threads_to_run;
-
-enum lttng_thread_type {
-	LTTNG_USER_THREAD = 0,
-	LTTNG_KERNEL_THREAD = 1,
-};
-
-enum lttng_execution_mode {
-	LTTNG_USER_MODE = 0,
-	LTTNG_SYSCALL = 1,
-	LTTNG_TRAP = 2,
-	LTTNG_IRQ = 3,
-	LTTNG_SOFTIRQ = 4,
-	LTTNG_MODE_UNKNOWN = 5,
-};
-
-enum lttng_execution_submode {
-	LTTNG_NONE = 0,
-	LTTNG_UNKNOWN = 1,
-};
-
-enum lttng_process_status {
-	LTTNG_UNNAMED = 0,
-	LTTNG_WAIT_FORK = 1,
-	LTTNG_WAIT_CPU = 2,
-	LTTNG_EXIT = 3,
-	LTTNG_ZOMBIE = 4,
-	LTTNG_WAIT = 5,
-	LTTNG_RUN = 6,
-	LTTNG_DEAD = 7,
-};
-
-static
-int lttng_enumerate_block_devices(struct lttng_session *session)
-{
-	struct class *ptr_block_class;
-	struct device_type *ptr_disk_type;
-	struct class_dev_iter iter;
-	struct device *dev;
-
-	ptr_block_class = wrapper_get_block_class();
-	if (!ptr_block_class)
-		return -ENOSYS;
-	ptr_disk_type = wrapper_get_disk_type();
-	if (!ptr_disk_type) {
-		return -ENOSYS;
-	}
-	class_dev_iter_init(&iter, ptr_block_class, NULL, ptr_disk_type);
-	while ((dev = class_dev_iter_next(&iter))) {
-		struct disk_part_iter piter;
-		struct gendisk *disk = dev_to_disk(dev);
-		struct hd_struct *part;
-
-		/*
-		 * Don't show empty devices or things that have been
-		 * suppressed
-		 */
-		if (get_capacity(disk) == 0 ||
-		    (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO))
-			continue;
-
-		disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
-		while ((part = disk_part_iter_next(&piter))) {
-			char name_buf[BDEVNAME_SIZE];
-			char *p;
-
-			p = wrapper_disk_name(disk, part->partno, name_buf);
-			if (!p) {
-				disk_part_iter_exit(&piter);
-				class_dev_iter_exit(&iter);
-				return -ENOSYS;
-			}
-			trace_lttng_statedump_block_device(session,
-					part_devt(part), name_buf);
-		}
-		disk_part_iter_exit(&piter);
-	}
-	class_dev_iter_exit(&iter);
-	return 0;
-}
-
-#ifdef CONFIG_INET
-
-static
-void lttng_enumerate_device(struct lttng_session *session,
-		struct net_device *dev)
-{
-	struct in_device *in_dev;
-	struct in_ifaddr *ifa;
-
-	if (dev->flags & IFF_UP) {
-		in_dev = in_dev_get(dev);
-		if (in_dev) {
-			for (ifa = in_dev->ifa_list; ifa != NULL;
-			     ifa = ifa->ifa_next) {
-				trace_lttng_statedump_network_interface(
-					session, dev, ifa);
-			}
-			in_dev_put(in_dev);
-		}
-	} else {
-		trace_lttng_statedump_network_interface(
-			session, dev, NULL);
-	}
-}
-
-static
-int lttng_enumerate_network_ip_interface(struct lttng_session *session)
-{
-	struct net_device *dev;
-
-	read_lock(&dev_base_lock);
-	for_each_netdev(&init_net, dev)
-		lttng_enumerate_device(session, dev);
-	read_unlock(&dev_base_lock);
-
-	return 0;
-}
-#else /* CONFIG_INET */
-static inline
-int lttng_enumerate_network_ip_interface(struct lttng_session *session)
-{
-	return 0;
-}
-#endif /* CONFIG_INET */
-
-static
-int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
-{
-	const struct lttng_fd_ctx *ctx = p;
-	const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE);
-	unsigned int flags = file->f_flags;
-
-	/*
-	 * We don't expose kernel internal flags, only userspace-visible
-	 * flags.
-	 */
-	flags &= ~FMODE_NONOTIFY;
-	if (test_bit(fd, ctx->fdt->close_on_exec))
-		flags |= O_CLOEXEC;
-	if (IS_ERR(s)) {
-		struct dentry *dentry = file->f_path.dentry;
-
-		/* Make sure we give at least some info */
-		spin_lock(&dentry->d_lock);
-		trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd,
-			dentry->d_name.name, flags, file->f_mode);
-		spin_unlock(&dentry->d_lock);
-		goto end;
-	}
-	trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd, s,
-		flags, file->f_mode);
-end:
-	return 0;
-}
-
-static
-void lttng_enumerate_task_fd(struct lttng_session *session,
-		struct task_struct *p, char *tmp)
-{
-	struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .p = p };
-
-	task_lock(p);
-	ctx.fdt = files_fdtable(p->files);
-	lttng_iterate_fd(p->files, 0, lttng_dump_one_fd, &ctx);
-	task_unlock(p);
-}
-
-static
-int lttng_enumerate_file_descriptors(struct lttng_session *session)
-{
-	struct task_struct *p;
-	char *tmp;
-
-	tmp = (char *) __get_free_page(GFP_KERNEL);
-	if (!tmp)
-		return -ENOMEM;
-
-	/* Enumerate active file descriptors */
-	rcu_read_lock();
-	for_each_process(p)
-		lttng_enumerate_task_fd(session, p, tmp);
-	rcu_read_unlock();
-	free_page((unsigned long) tmp);
-	return 0;
-}
-
-#if 0
-/*
- * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section
- * (scheduling in atomic). Normally, the tasklist lock protects this kind of
- * iteration, but it is not exported to modules.
- */
-static
-void lttng_enumerate_task_vm_maps(struct lttng_session *session,
-		struct task_struct *p)
-{
-	struct mm_struct *mm;
-	struct vm_area_struct *map;
-	unsigned long ino;
-
-	/* get_task_mm does a task_lock... */
-	mm = get_task_mm(p);
-	if (!mm)
-		return;
-
-	map = mm->mmap;
-	if (map) {
-		down_read(&mm->mmap_sem);
-		while (map) {
-			if (map->vm_file)
-				ino = map->vm_file->f_dentry->d_inode->i_ino;
-			else
-				ino = 0;
-			trace_lttng_statedump_vm_map(session, p, map, ino);
-			map = map->vm_next;
-		}
-		up_read(&mm->mmap_sem);
-	}
-	mmput(mm);
-}
-
-static
-int lttng_enumerate_vm_maps(struct lttng_session *session)
-{
-	struct task_struct *p;
-
-	rcu_read_lock();
-	for_each_process(p)
-		lttng_enumerate_task_vm_maps(session, p);
-	rcu_read_unlock();
-	return 0;
-}
-#endif
-
-#ifdef CONFIG_LTTNG_HAS_LIST_IRQ
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39))
-#define irq_desc_get_chip(desc) get_irq_desc_chip(desc)
-#endif
-
-static
-int lttng_list_interrupts(struct lttng_session *session)
-{
-	unsigned int irq;
-	unsigned long flags = 0;
-	struct irq_desc *desc;
-
-#define irq_to_desc	wrapper_irq_to_desc
-	/* needs irq_desc */
-	for_each_irq_desc(irq, desc) {
-		struct irqaction *action;
-		const char *irq_chip_name =
-			irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip";
-
-		local_irq_save(flags);
-		wrapper_desc_spin_lock(&desc->lock);
-		for (action = desc->action; action; action = action->next) {
-			trace_lttng_statedump_interrupt(session,
-				irq, irq_chip_name, action);
-		}
-		wrapper_desc_spin_unlock(&desc->lock);
-		local_irq_restore(flags);
-	}
-	return 0;
-#undef irq_to_desc
-}
-#else
-static inline
-int lttng_list_interrupts(struct lttng_session *session)
-{
-	return 0;
-}
-#endif
-
-static
-void lttng_statedump_process_ns(struct lttng_session *session,
-		struct task_struct *p,
-		enum lttng_thread_type type,
-		enum lttng_execution_mode mode,
-		enum lttng_execution_submode submode,
-		enum lttng_process_status status)
-{
-	struct nsproxy *proxy;
-	struct pid_namespace *pid_ns;
-
-	rcu_read_lock();
-	proxy = task_nsproxy(p);
-	if (proxy) {
-		pid_ns = lttng_get_proxy_pid_ns(proxy);
-		do {
-			trace_lttng_statedump_process_state(session,
-				p, type, mode, submode, status, pid_ns);
-			pid_ns = pid_ns->parent;
-		} while (pid_ns);
-	} else {
-		trace_lttng_statedump_process_state(session,
-			p, type, mode, submode, status, NULL);
-	}
-	rcu_read_unlock();
-}
-
-static
-int lttng_enumerate_process_states(struct lttng_session *session)
-{
-	struct task_struct *g, *p;
-
-	rcu_read_lock();
-	for_each_process(g) {
-		p = g;
-		do {
-			enum lttng_execution_mode mode =
-				LTTNG_MODE_UNKNOWN;
-			enum lttng_execution_submode submode =
-				LTTNG_UNKNOWN;
-			enum lttng_process_status status;
-			enum lttng_thread_type type;
-
-			task_lock(p);
-			if (p->exit_state == EXIT_ZOMBIE)
-				status = LTTNG_ZOMBIE;
-			else if (p->exit_state == EXIT_DEAD)
-				status = LTTNG_DEAD;
-			else if (p->state == TASK_RUNNING) {
-				/* Is this a forked child that has not run yet? */
-				if (list_empty(&p->rt.run_list))
-					status = LTTNG_WAIT_FORK;
-				else
-					/*
-					 * All tasks are considered as wait_cpu;
-					 * the viewer will sort out if the task
-					 * was really running at this time.
-					 */
-					status = LTTNG_WAIT_CPU;
-			} else if (p->state &
-				(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)) {
-				/* Task is waiting for something to complete */
-				status = LTTNG_WAIT;
-			} else
-				status = LTTNG_UNNAMED;
-			submode = LTTNG_NONE;
-
-			/*
-			 * Verification of t->mm is to filter out kernel
-			 * threads; Viewer will further filter out if a
-			 * user-space thread was in syscall mode or not.
-			 */
-			if (p->mm)
-				type = LTTNG_USER_THREAD;
-			else
-				type = LTTNG_KERNEL_THREAD;
-			lttng_statedump_process_ns(session,
-				p, type, mode, submode, status);
-			task_unlock(p);
-		} while_each_thread(g, p);
-	}
-	rcu_read_unlock();
-
-	return 0;
-}
-
-static
-void lttng_statedump_work_func(struct work_struct *work)
-{
-	if (atomic_dec_and_test(&kernel_threads_to_run))
-		/* If we are the last thread, wake up do_lttng_statedump */
-		wake_up(&statedump_wq);
-}
-
-static
-int do_lttng_statedump(struct lttng_session *session)
-{
-	int cpu, ret;
-
-	trace_lttng_statedump_start(session);
-	ret = lttng_enumerate_process_states(session);
-	if (ret)
-		return ret;
-	ret = lttng_enumerate_file_descriptors(session);
-	if (ret)
-		return ret;
-	/*
-	 * FIXME
-	 * ret = lttng_enumerate_vm_maps(session);
-	 * if (ret)
-	 * 	return ret;
-	 */
-	ret = lttng_list_interrupts(session);
-	if (ret)
-		return ret;
-	ret = lttng_enumerate_network_ip_interface(session);
-	if (ret)
-		return ret;
-	ret = lttng_enumerate_block_devices(session);
-	switch (ret) {
-	case -ENOSYS:
-		printk(KERN_WARNING "LTTng: block device enumeration is not supported by kernel\n");
-		break;
-	default:
-		return ret;
-	}
-
-	/* TODO lttng_dump_idt_table(session); */
-	/* TODO lttng_dump_softirq_vec(session); */
-	/* TODO lttng_list_modules(session); */
-	/* TODO lttng_dump_swap_files(session); */
-
-	/*
-	 * Fire off a work queue on each CPU. Their sole purpose in life
-	 * is to guarantee that each CPU has been in a state where is was in
-	 * syscall mode (i.e. not in a trap, an IRQ or a soft IRQ).
-	 */
-	get_online_cpus();
-	atomic_set(&kernel_threads_to_run, num_online_cpus());
-	for_each_online_cpu(cpu) {
-		INIT_DELAYED_WORK(&cpu_work[cpu], lttng_statedump_work_func);
-		schedule_delayed_work_on(cpu, &cpu_work[cpu], 0);
-	}
-	/* Wait for all threads to run */
-	__wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0));
-	put_online_cpus();
-	/* Our work is done */
-	trace_lttng_statedump_end(session);
-	return 0;
-}
-
-/*
- * Called with session mutex held.
- */
-int lttng_statedump_start(struct lttng_session *session)
-{
-	return do_lttng_statedump(session);
-}
-EXPORT_SYMBOL_GPL(lttng_statedump_start);
-
-static
-int __init lttng_statedump_init(void)
-{
-	/*
-	 * Allow module to load even if the fixup cannot be done. This
-	 * will allow seemless transition when the underlying issue fix
-	 * is merged into the Linux kernel, and when tracepoint.c
-	 * "tracepoint_module_notify" is turned into a static function.
-	 */
-	(void) wrapper_lttng_fixup_sig(THIS_MODULE);
-	return 0;
-}
-
-module_init(lttng_statedump_init);
-
-static
-void __exit lttng_statedump_exit(void)
-{
-}
-
-module_exit(lttng_statedump_exit);
-
-MODULE_LICENSE("GPL and additional rights");
-MODULE_AUTHOR("Jean-Hugues Deschenes");
-MODULE_DESCRIPTION("Linux Trace Toolkit Next Generation Statedump");
-MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
-	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
-	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
-	LTTNG_MODULES_EXTRAVERSION);