tracing: Consolidate protection of reader access to the ring buffer

At the beginning, access to the ring buffer was fully serialized
by trace_types_lock. Patch d7350c3f4569 gives more freedom to readers,
and patch b04cc6b1f6 adds code to protect trace_pipe and cpu#/trace_pipe.

But actually it is not enough, ring buffer readers are not always
read-only, they may consume data.

This patch makes accesses to trace, trace_pipe, trace_pipe_raw
cpu#/trace, cpu#/trace_pipe and cpu#/trace_pipe_raw serialized.
And removes tracing_reader_cpumask which is used to protect trace_pipe.

Details:

Ring buffer serializes readers, but it is low level protection.
The validity of the events (which returns by ring_buffer_peek() ..etc)
are not protected by ring buffer.

The content of events may become garbage if we allow another process to consume
these events concurrently:
  A) the page of the consumed events may become a normal page
     (not reader page) in ring buffer, and this page will be rewritten
     by the events producer.
  B) The page of the consumed events may become a page for splice_read,
     and this page will be returned to system.

This patch adds trace_access_lock() and trace_access_unlock() primitives.

These primitives allow multi process access to different cpu ring buffers
concurrently.

These primitives don't distinguish read-only and read-consume access.
Multi read-only access is also serialized.

And we don't use these primitives when we open files,
we only use them when we read files.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4B447D52.1050602@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0df1b0f..abdd333 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -32,6 +32,7 @@
 #include <linux/splice.h>
 #include <linux/kdebug.h>
 #include <linux/string.h>
+#include <linux/rwsem.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/poll.h>
@@ -102,9 +103,6 @@ static inline void ftrace_enable_cpu(void)
 
 static cpumask_var_t __read_mostly     tracing_buffer_mask;
 
-/* Define which cpu buffers are currently read in trace_pipe */
-static cpumask_var_t                   tracing_reader_cpumask;
-
 #define for_each_tracing_cpu(cpu)      \
        for_each_cpu(cpu, tracing_buffer_mask)
 
@@ -243,12 +241,91 @@ static struct tracer              *current_trace __read_mostly;
 
 /*
  * trace_types_lock is used to protect the trace_types list.
- * This lock is also used to keep user access serialized.
- * Accesses from userspace will grab this lock while userspace
- * activities happen inside the kernel.
  */
 static DEFINE_MUTEX(trace_types_lock);
 
+/*
+ * serialize the access of the ring buffer
+ *
+ * ring buffer serializes readers, but it is low level protection.
+ * The validity of the events (which returns by ring_buffer_peek() ..etc)
+ * are not protected by ring buffer.
+ *
+ * The content of events may become garbage if we allow other process consumes
+ * these events concurrently:
+ *   A) the page of the consumed events may become a normal page
+ *      (not reader page) in ring buffer, and this page will be rewrited
+ *      by events producer.
+ *   B) The page of the consumed events may become a page for splice_read,
+ *      and this page will be returned to system.
+ *
+ * These primitives allow multi process access to different cpu ring buffer
+ * concurrently.
+ *
+ * These primitives don't distinguish read-only and read-consume access.
+ * Multi read-only access are also serialized.
+ */
+
+#ifdef CONFIG_SMP
+static DECLARE_RWSEM(all_cpu_access_lock);
+static DEFINE_PER_CPU(struct mutex, cpu_access_lock);
+
+static inline void trace_access_lock(int cpu)
+{
+       if (cpu == TRACE_PIPE_ALL_CPU) {
+               /* gain it for accessing the whole ring buffer. */
+               down_write(&all_cpu_access_lock);
+       } else {
+               /* gain it for accessing a cpu ring buffer. */
+
+               /* Firstly block other trace_access_lock(TRACE_PIPE_ALL_CPU). */
+               down_read(&all_cpu_access_lock);
+
+               /* Secondly block other access to this @cpu ring buffer. */
+               mutex_lock(&per_cpu(cpu_access_lock, cpu));
+       }
+}
+
+static inline void trace_access_unlock(int cpu)
+{
+       if (cpu == TRACE_PIPE_ALL_CPU) {
+               up_write(&all_cpu_access_lock);
+       } else {
+               mutex_unlock(&per_cpu(cpu_access_lock, cpu));
+               up_read(&all_cpu_access_lock);
+       }
+}
+
+static inline void trace_access_lock_init(void)
+{
+       int cpu;
+
+       for_each_possible_cpu(cpu)
+               mutex_init(&per_cpu(cpu_access_lock, cpu));
+}
+
+#else
+
+static DEFINE_MUTEX(access_lock);
+
+static inline void trace_access_lock(int cpu)
+{
+       (void)cpu;
+       mutex_lock(&access_lock);
+}
+
+static inline void trace_access_unlock(int cpu)
+{
+       (void)cpu;
+       mutex_unlock(&access_lock);
+}
+
+static inline void trace_access_lock_init(void)
+{
+}
+
+#endif
+
 /* trace_wait is a waitqueue for tasks blocked on trace_poll */
 static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
 
@@ -1580,12 +1657,6 @@ static void tracing_iter_reset(struct trace_iterator *iter, int cpu)
 }
 
 /*
- * No necessary locking here. The worst thing which can
- * happen is loosing events consumed at the same time
- * by a trace_pipe reader.
- * Other than that, we don't risk to crash the ring buffer
- * because it serializes the readers.
- *
  * The current tracer is copied to avoid a global locking
  * all around.
  */
@@ -1640,12 +1711,16 @@ static void *s_start(struct seq_file *m, loff_t *pos)
        }
 
        trace_event_read_lock();
+       trace_access_lock(cpu_file);
        return p;
 }
 
 static void s_stop(struct seq_file *m, void *p)
 {
+       struct trace_iterator *iter = m->private;
+
        atomic_dec(&trace_record_cmdline_disabled);
+       trace_access_unlock(iter->cpu_file);
        trace_event_read_unlock();
 }
 
@@ -2836,22 +2911,6 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
 
        mutex_lock(&trace_types_lock);
 
-       /* We only allow one reader per cpu */
-       if (cpu_file == TRACE_PIPE_ALL_CPU) {
-               if (!cpumask_empty(tracing_reader_cpumask)) {
-                       ret = -EBUSY;
-                       goto out;
-               }
-               cpumask_setall(tracing_reader_cpumask);
-       } else {
-               if (!cpumask_test_cpu(cpu_file, tracing_reader_cpumask))
-                       cpumask_set_cpu(cpu_file, tracing_reader_cpumask);
-               else {
-                       ret = -EBUSY;
-                       goto out;
-               }
-       }
-
        /* create a buffer to store the information to pass to userspace */
        iter = kzalloc(sizeof(*iter), GFP_KERNEL);
        if (!iter) {
@@ -2907,12 +2966,6 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
 
        mutex_lock(&trace_types_lock);
 
-       if (iter->cpu_file == TRACE_PIPE_ALL_CPU)
-               cpumask_clear(tracing_reader_cpumask);
-       else
-               cpumask_clear_cpu(iter->cpu_file, tracing_reader_cpumask);
-
-
        if (iter->trace->pipe_close)
                iter->trace->pipe_close(iter);
 
@@ -3074,6 +3127,7 @@ waitagain:
        iter->pos = -1;
 
        trace_event_read_lock();
+       trace_access_lock(iter->cpu_file);
        while (find_next_entry_inc(iter) != NULL) {
                enum print_line_t ret;
                int len = iter->seq.len;
@@ -3090,6 +3144,7 @@ waitagain:
                if (iter->seq.len >= cnt)
                        break;
        }
+       trace_access_unlock(iter->cpu_file);
        trace_event_read_unlock();
 
        /* Now copy what we have to the user */
@@ -3215,6 +3270,7 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
        }
 
        trace_event_read_lock();
+       trace_access_lock(iter->cpu_file);
 
        /* Fill as many pages as possible. */
        for (i = 0, rem = len; i < PIPE_BUFFERS && rem; i++) {
@@ -3238,6 +3294,7 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
                trace_seq_init(&iter->seq);
        }
 
+       trace_access_unlock(iter->cpu_file);
        trace_event_read_unlock();
        mutex_unlock(&iter->mutex);
 
@@ -3539,10 +3596,12 @@ tracing_buffers_read(struct file *filp, char __user *ubuf,
 
        info->read = 0;
 
+       trace_access_lock(info->cpu);
        ret = ring_buffer_read_page(info->tr->buffer,
                                    &info->spare,
                                    count,
                                    info->cpu, 0);
+       trace_access_unlock(info->cpu);
        if (ret < 0)
                return 0;
 
@@ -3670,6 +3729,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                len &= PAGE_MASK;
        }
 
+       trace_access_lock(info->cpu);
        entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
 
        for (i = 0; i < PIPE_BUFFERS && len && entries; i++, len -= PAGE_SIZE) {
@@ -3717,6 +3777,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                entries = ring_buffer_entries_cpu(info->tr->buffer, info->cpu);
        }
 
+       trace_access_unlock(info->cpu);
        spd.nr_pages = i;
 
        /* did we read anything? */
@@ -4153,6 +4214,8 @@ static __init int tracer_init_debugfs(void)
        struct dentry *d_tracer;
        int cpu;
 
+       trace_access_lock_init();
+
        d_tracer = tracing_init_dentry();
 
        trace_create_file("tracing_enabled", 0644, d_tracer,
@@ -4387,9 +4450,6 @@ __init static int tracer_alloc_buffers(void)
        if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL))
                goto out_free_buffer_mask;
 
-       if (!zalloc_cpumask_var(&tracing_reader_cpumask, GFP_KERNEL))
-               goto out_free_tracing_cpumask;
-
        /* To save memory, keep the ring buffer size to its minimum */
        if (ring_buffer_expanded)
                ring_buf_size = trace_buf_size;
@@ -4447,8 +4507,6 @@ __init static int tracer_alloc_buffers(void)
        return 0;
 
 out_free_cpumask:
-       free_cpumask_var(tracing_reader_cpumask);
-out_free_tracing_cpumask:
        free_cpumask_var(tracing_cpumask);
 out_free_buffer_mask:
        free_cpumask_var(tracing_buffer_mask);