USB: EHCI: defer reclamation of siTDs

[safe/jmp/linux-2.6] / drivers / oprofile / cpu_buffer.h

diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index e608976..68ea16a 100644 (file)
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -1,10 +1,11 @@
 /**
  * @file cpu_buffer.h
  *
- * @remark Copyright 2002 OProfile authors
+ * @remark Copyright 2002-2009 OProfile authors
  * @remark Read the file COPYING
  *
  * @author John Levon <levon@movementarian.org>
+ * @author Robert Richter <robert.richter@amd.com>
  */
 
 #ifndef OPROFILE_CPU_BUFFER_H
@@ -15,6 +16,7 @@
 #include <linux/workqueue.h>
 #include <linux/cache.h>
 #include <linux/sched.h>
+#include <linux/ring_buffer.h>
 
 struct task_struct;
 
@@ -30,16 +32,16 @@ void end_cpu_work(void);
 struct op_sample {
        unsigned long eip;
        unsigned long event;
+       unsigned long data[0];
 };
 
+struct op_entry;
+
 struct oprofile_cpu_buffer {
-       volatile unsigned long head_pos;
-       volatile unsigned long tail_pos;
        unsigned long buffer_size;
        struct task_struct *last_task;
        int last_is_kernel;
        int tracing;
-       struct op_sample *buffer;
        unsigned long sample_received;
        unsigned long sample_lost_overflow;
        unsigned long backtrace_aborted;
@@ -48,43 +50,71 @@ struct oprofile_cpu_buffer {
        struct delayed_work work;
 };
 
-DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
+DECLARE_PER_CPU(struct oprofile_cpu_buffer, op_cpu_buffer);
+
+/*
+ * Resets the cpu buffer to a sane state.
+ *
+ * reset these to invalid values; the next sample collected will
+ * populate the buffer with proper values to initialize the buffer
+ */
+static inline void op_cpu_buffer_reset(int cpu)
+{
+       struct oprofile_cpu_buffer *cpu_buf = &per_cpu(op_cpu_buffer, cpu);
+
+       cpu_buf->last_is_kernel = -1;
+       cpu_buf->last_task = NULL;
+}
+
+/*
+ * op_cpu_buffer_add_data() and op_cpu_buffer_write_commit() may be
+ * called only if op_cpu_buffer_write_reserve() did not return NULL or
+ * entry->event != NULL, otherwise entry->size or entry->event will be
+ * used uninitialized.
+ */
 
-void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf);
+struct op_sample
+*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size);
+int op_cpu_buffer_write_commit(struct op_entry *entry);
+struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu);
+unsigned long op_cpu_buffer_entries(int cpu);
 
+/* returns the remaining free size of data in the entry */
 static inline
-struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
+int op_cpu_buffer_add_data(struct op_entry *entry, unsigned long val)
 {
-       return &cpu_buf->buffer[cpu_buf->head_pos];
+       if (!entry->size)
+               return 0;
+       *entry->data = val;
+       entry->size--;
+       entry->data++;
+       return entry->size;
 }
 
+/* returns the size of data in the entry */
 static inline
-void cpu_buffer_write_commit(struct oprofile_cpu_buffer *b)
+int op_cpu_buffer_get_size(struct op_entry *entry)
 {
-       unsigned long new_head = b->head_pos + 1;
-
-       /*
-        * Ensure anything written to the slot before we increment is
-        * visible
-        */
-       wmb();
-
-       if (new_head < b->buffer_size)
-               b->head_pos = new_head;
-       else
-               b->head_pos = 0;
+       return entry->size;
 }
 
+/* returns 0 if empty or the size of data including the current value */
 static inline
-struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
+int op_cpu_buffer_get_data(struct op_entry *entry, unsigned long *val)
 {
-       return &cpu_buf->buffer[cpu_buf->tail_pos];
+       int size = entry->size;
+       if (!size)
+               return 0;
+       *val = *entry->data;
+       entry->size--;
+       entry->data++;
+       return size;
 }
 
-/* transient events for the CPU buffer -> event buffer */
-#define CPU_IS_KERNEL 1
-#define CPU_TRACE_BEGIN 2
-#define IBS_FETCH_BEGIN 3
-#define IBS_OP_BEGIN    4
+/* extra data flags */
+#define KERNEL_CTX_SWITCH      (1UL << 0)
+#define IS_KERNEL              (1UL << 1)
+#define TRACE_BEGIN            (1UL << 2)
+#define USER_CTX_SWITCH                (1UL << 3)
 
 #endif /* OPROFILE_CPU_BUFFER_H */