oprofile: adding cpu buffer r/w access functions

This is in preparation for changes in the cpu buffer implementation.

Signed-off-by: Robert Richter <robert.richter@amd.com>

diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index 7d61ae8..44f676c 100644 (file)
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -331,10 +331,8 @@ static void add_trace_begin(void)
 
 #define IBS_FETCH_CODE_SIZE    2
 #define IBS_OP_CODE_SIZE       5
-#define IBS_EIP(offset)                                \
-       (((struct op_sample *)&cpu_buf->buffer[(offset)])->eip)
-#define IBS_EVENT(offset)                              \
-       (((struct op_sample *)&cpu_buf->buffer[(offset)])->event)
+#define IBS_EIP(cpu_buf)       ((cpu_buffer_read_entry(cpu_buf))->eip)
+#define IBS_EVENT(cpu_buf)     ((cpu_buffer_read_entry(cpu_buf))->event)
 
 /*
  * Add IBS fetch and op entries to event buffer
@@ -349,10 +347,10 @@ static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
 
        increment_tail(cpu_buf);        /* move to RIP entry */
 
-       rip = IBS_EIP(cpu_buf->tail_pos);
+       rip = IBS_EIP(cpu_buf);
 
 #ifdef __LP64__
-       rip += IBS_EVENT(cpu_buf->tail_pos) << 32;
+       rip += IBS_EVENT(cpu_buf) << 32;
 #endif
 
        if (mm) {
@@ -376,8 +374,8 @@ static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
        add_event_entry(offset);        /* Offset from Dcookie */
 
        /* we send the Dcookie offset, but send the raw Linear Add also*/
-       add_event_entry(IBS_EIP(cpu_buf->tail_pos));
-       add_event_entry(IBS_EVENT(cpu_buf->tail_pos));
+       add_event_entry(IBS_EIP(cpu_buf));
+       add_event_entry(IBS_EVENT(cpu_buf));
 
        if (code == IBS_FETCH_CODE)
                count = IBS_FETCH_CODE_SIZE;    /*IBS FETCH is 2 int64s*/
@@ -386,8 +384,8 @@ static void add_ibs_begin(struct oprofile_cpu_buffer *cpu_buf, int code,
 
        for (i = 0; i < count; i++) {
                increment_tail(cpu_buf);
-               add_event_entry(IBS_EIP(cpu_buf->tail_pos));
-               add_event_entry(IBS_EVENT(cpu_buf->tail_pos));
+               add_event_entry(IBS_EIP(cpu_buf));
+               add_event_entry(IBS_EVENT(cpu_buf));
        }
 }
 
@@ -584,7 +582,7 @@ void sync_buffer(int cpu)
 #else
        while (get_slots(cpu_buf)) {
 #endif
-               struct op_sample *s = &cpu_buf->buffer[cpu_buf->tail_pos];
+               struct op_sample *s = cpu_buffer_read_entry(cpu_buf);
 
                if (is_code(s->eip)) {
                        switch (s->event) {

diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
index 2c4d541..7e5e650 100644 (file)
--- a/drivers/oprofile/cpu_buffer.c
+++ b/drivers/oprofile/cpu_buffer.c
@@ -168,7 +168,7 @@ static inline void
 add_sample(struct oprofile_cpu_buffer *cpu_buf,
           unsigned long pc, unsigned long event)
 {
-       struct op_sample *entry = &cpu_buf->buffer[cpu_buf->head_pos];
+       struct op_sample *entry = cpu_buffer_write_entry(cpu_buf);
        entry->eip = pc;
        entry->event = event;
        increment_head(cpu_buf);

diff --git a/drivers/oprofile/cpu_buffer.h b/drivers/oprofile/cpu_buffer.h
index d3cc262..0870699 100644 (file)
--- a/drivers/oprofile/cpu_buffer.h
+++ b/drivers/oprofile/cpu_buffer.h
@@ -52,6 +52,18 @@ DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
 
 void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf);
 
+static inline
+struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
+{
+       return &cpu_buf->buffer[cpu_buf->head_pos];
+}
+
+static inline
+struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
+{
+       return &cpu_buf->buffer[cpu_buf->tail_pos];
+}
+
 /* transient events for the CPU buffer -> event buffer */
 #define CPU_IS_KERNEL 1
 #define CPU_TRACE_BEGIN 2