1 files changed, 0 insertions, 465 deletions
diff --git a/drivers/oprofile/cpu_buffer.c b/drivers/oprofile/cpu_buffer.c
deleted file mode 100644
index 9210a95cb4e6..000000000000
--- a/drivers/oprofile/cpu_buffer.c
+++ /dev/null
@@ -1,465 +0,0 @@
-/**
- * @file cpu_buffer.c
- *
- * @remark Copyright 2002-2009 OProfile authors
- * @remark Read the file COPYING
- *
- * @author John Levon <levon@movementarian.org>
- * @author Barry Kasindorf <barry.kasindorf@amd.com>
- * @author Robert Richter <robert.richter@amd.com>
- *
- * Each CPU has a local buffer that stores PC value/event
- * pairs. We also log context switches when we notice them.
- * Eventually each CPU's buffer is processed into the global
- * event buffer by sync_buffer().
- *
- * We use a local buffer for two reasons: an NMI or similar
- * interrupt cannot synchronise, and high sampling rates
- * would lead to catastrophic global synchronisation if
- * a global buffer was used.
- */
-
-#include <linux/sched.h>
-#include <linux/oprofile.h>
-#include <linux/errno.h>
-
-#include <asm/ptrace.h>
-
-#include "event_buffer.h"
-#include "cpu_buffer.h"
-#include "buffer_sync.h"
-#include "oprof.h"
-
-#define OP_BUFFER_FLAGS	0
-
-static struct trace_buffer *op_ring_buffer;
-DEFINE_PER_CPU(struct oprofile_cpu_buffer, op_cpu_buffer);
-
-static void wq_sync_buffer(struct work_struct *work);
-
-#define DEFAULT_TIMER_EXPIRE (HZ / 10)
-static int work_enabled;
-
-unsigned long oprofile_get_cpu_buffer_size(void)
-{
-	return oprofile_cpu_buffer_size;
-}
-
-void oprofile_cpu_buffer_inc_smpl_lost(void)
-{
-	struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-
-	cpu_buf->sample_lost_overflow++;
-}
-
-void free_cpu_buffers(void)
-{
-	if (op_ring_buffer)
-		ring_buffer_free(op_ring_buffer);
-	op_ring_buffer = NULL;
-}
-
-#define RB_EVENT_HDR_SIZE 4
-
-int alloc_cpu_buffers(void)
-{
-	int i;
-
-	unsigned long buffer_size = oprofile_cpu_buffer_size;
-	unsigned long byte_size = buffer_size * (sizeof(struct op_sample) +
-						 RB_EVENT_HDR_SIZE);
-
-	op_ring_buffer = ring_buffer_alloc(byte_size, OP_BUFFER_FLAGS);
-	if (!op_ring_buffer)
-		goto fail;
-
-	for_each_possible_cpu(i) {
-		struct oprofile_cpu_buffer *b = &per_cpu(op_cpu_buffer, i);
-
-		b->last_task = NULL;
-		b->last_is_kernel = -1;
-		b->tracing = 0;
-		b->buffer_size = buffer_size;
-		b->sample_received = 0;
-		b->sample_lost_overflow = 0;
-		b->backtrace_aborted = 0;
-		b->sample_invalid_eip = 0;
-		b->cpu = i;
-		INIT_DELAYED_WORK(&b->work, wq_sync_buffer);
-	}
-	return 0;
-
-fail:
-	free_cpu_buffers();
-	return -ENOMEM;
-}
-
-void start_cpu_work(void)
-{
-	int i;
-
-	work_enabled = 1;
-
-	for_each_online_cpu(i) {
-		struct oprofile_cpu_buffer *b = &per_cpu(op_cpu_buffer, i);
-
-		/*
-		 * Spread the work by 1 jiffy per cpu so they dont all
-		 * fire at once.
-		 */
-		schedule_delayed_work_on(i, &b->work, DEFAULT_TIMER_EXPIRE + i);
-	}
-}
-
-void end_cpu_work(void)
-{
-	work_enabled = 0;
-}
-
-void flush_cpu_work(void)
-{
-	int i;
-
-	for_each_online_cpu(i) {
-		struct oprofile_cpu_buffer *b = &per_cpu(op_cpu_buffer, i);
-
-		/* these works are per-cpu, no need for flush_sync */
-		flush_delayed_work(&b->work);
-	}
-}
-
-/*
- * This function prepares the cpu buffer to write a sample.
- *
- * Struct op_entry is used during operations on the ring buffer while
- * struct op_sample contains the data that is stored in the ring
- * buffer. Struct entry can be uninitialized. The function reserves a
- * data array that is specified by size. Use
- * op_cpu_buffer_write_commit() after preparing the sample. In case of
- * errors a null pointer is returned, otherwise the pointer to the
- * sample.
- *
- */
-struct op_sample
-*op_cpu_buffer_write_reserve(struct op_entry *entry, unsigned long size)
-{
-	entry->event = ring_buffer_lock_reserve
-		(op_ring_buffer, sizeof(struct op_sample) +
-		 size * sizeof(entry->sample->data[0]));
-	if (!entry->event)
-		return NULL;
-	entry->sample = ring_buffer_event_data(entry->event);
-	entry->size = size;
-	entry->data = entry->sample->data;
-
-	return entry->sample;
-}
-
-int op_cpu_buffer_write_commit(struct op_entry *entry)
-{
-	return ring_buffer_unlock_commit(op_ring_buffer, entry->event);
-}
-
-struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu)
-{
-	struct ring_buffer_event *e;
-	e = ring_buffer_consume(op_ring_buffer, cpu, NULL, NULL);
-	if (!e)
-		return NULL;
-
-	entry->event = e;
-	entry->sample = ring_buffer_event_data(e);
-	entry->size = (ring_buffer_event_length(e) - sizeof(struct op_sample))
-		/ sizeof(entry->sample->data[0]);
-	entry->data = entry->sample->data;
-	return entry->sample;
-}
-
-unsigned long op_cpu_buffer_entries(int cpu)
-{
-	return ring_buffer_entries_cpu(op_ring_buffer, cpu);
-}
-
-static int
-op_add_code(struct oprofile_cpu_buffer *cpu_buf, unsigned long backtrace,
-	    int is_kernel, struct task_struct *task)
-{
-	struct op_entry entry;
-	struct op_sample *sample;
-	unsigned long flags;
-	int size;
-
-	flags = 0;
-
-	if (backtrace)
-		flags |= TRACE_BEGIN;
-
-	/* notice a switch from user->kernel or vice versa */
-	is_kernel = !!is_kernel;
-	if (cpu_buf->last_is_kernel != is_kernel) {
-		cpu_buf->last_is_kernel = is_kernel;
-		flags |= KERNEL_CTX_SWITCH;
-		if (is_kernel)
-			flags |= IS_KERNEL;
-	}
-
-	/* notice a task switch */
-	if (cpu_buf->last_task != task) {
-		cpu_buf->last_task = task;
-		flags |= USER_CTX_SWITCH;
-	}
-
-	if (!flags)
-		/* nothing to do */
-		return 0;
-
-	if (flags & USER_CTX_SWITCH)
-		size = 1;
-	else
-		size = 0;
-
-	sample = op_cpu_buffer_write_reserve(&entry, size);
-	if (!sample)
-		return -ENOMEM;
-
-	sample->eip = ESCAPE_CODE;
-	sample->event = flags;
-
-	if (size)
-		op_cpu_buffer_add_data(&entry, (unsigned long)task);
-
-	op_cpu_buffer_write_commit(&entry);
-
-	return 0;
-}
-
-static inline int
-op_add_sample(struct oprofile_cpu_buffer *cpu_buf,
-	      unsigned long pc, unsigned long event)
-{
-	struct op_entry entry;
-	struct op_sample *sample;
-
-	sample = op_cpu_buffer_write_reserve(&entry, 0);
-	if (!sample)
-		return -ENOMEM;
-
-	sample->eip = pc;
-	sample->event = event;
-
-	return op_cpu_buffer_write_commit(&entry);
-}
-
-/*
- * This must be safe from any context.
- *
- * is_kernel is needed because on some architectures you cannot
- * tell if you are in kernel or user space simply by looking at
- * pc. We tag this in the buffer by generating kernel enter/exit
- * events whenever is_kernel changes
- */
-static int
-log_sample(struct oprofile_cpu_buffer *cpu_buf, unsigned long pc,
-	   unsigned long backtrace, int is_kernel, unsigned long event,
-	   struct task_struct *task)
-{
-	struct task_struct *tsk = task ? task : current;
-	cpu_buf->sample_received++;
-
-	if (pc == ESCAPE_CODE) {
-		cpu_buf->sample_invalid_eip++;
-		return 0;
-	}
-
-	if (op_add_code(cpu_buf, backtrace, is_kernel, tsk))
-		goto fail;
-
-	if (op_add_sample(cpu_buf, pc, event))
-		goto fail;
-
-	return 1;
-
-fail:
-	cpu_buf->sample_lost_overflow++;
-	return 0;
-}
-
-static inline void oprofile_begin_trace(struct oprofile_cpu_buffer *cpu_buf)
-{
-	cpu_buf->tracing = 1;
-}
-
-static inline void oprofile_end_trace(struct oprofile_cpu_buffer *cpu_buf)
-{
-	cpu_buf->tracing = 0;
-}
-
-static inline void
-__oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
-			  unsigned long event, int is_kernel,
-			  struct task_struct *task)
-{
-	struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-	unsigned long backtrace = oprofile_backtrace_depth;
-
-	/*
-	 * if log_sample() fail we can't backtrace since we lost the
-	 * source of this event
-	 */
-	if (!log_sample(cpu_buf, pc, backtrace, is_kernel, event, task))
-		/* failed */
-		return;
-
-	if (!backtrace)
-		return;
-
-	oprofile_begin_trace(cpu_buf);
-	oprofile_ops.backtrace(regs, backtrace);
-	oprofile_end_trace(cpu_buf);
-}
-
-void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
-				unsigned long event, int is_kernel,
-				struct task_struct *task)
-{
-	__oprofile_add_ext_sample(pc, regs, event, is_kernel, task);
-}
-
-void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
-			     unsigned long event, int is_kernel)
-{
-	__oprofile_add_ext_sample(pc, regs, event, is_kernel, NULL);
-}
-
-void oprofile_add_sample(struct pt_regs * const regs, unsigned long event)
-{
-	int is_kernel;
-	unsigned long pc;
-
-	if (likely(regs)) {
-		is_kernel = !user_mode(regs);
-		pc = profile_pc(regs);
-	} else {
-		is_kernel = 0;    /* This value will not be used */
-		pc = ESCAPE_CODE; /* as this causes an early return. */
-	}
-
-	__oprofile_add_ext_sample(pc, regs, event, is_kernel, NULL);
-}
-
-/*
- * Add samples with data to the ring buffer.
- *
- * Use oprofile_add_data(&entry, val) to add data and
- * oprofile_write_commit(&entry) to commit the sample.
- */
-void
-oprofile_write_reserve(struct op_entry *entry, struct pt_regs * const regs,
-		       unsigned long pc, int code, int size)
-{
-	struct op_sample *sample;
-	int is_kernel = !user_mode(regs);
-	struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-
-	cpu_buf->sample_received++;
-
-	/* no backtraces for samples with data */
-	if (op_add_code(cpu_buf, 0, is_kernel, current))
-		goto fail;
-
-	sample = op_cpu_buffer_write_reserve(entry, size + 2);
-	if (!sample)
-		goto fail;
-	sample->eip = ESCAPE_CODE;
-	sample->event = 0;		/* no flags */
-
-	op_cpu_buffer_add_data(entry, code);
-	op_cpu_buffer_add_data(entry, pc);
-
-	return;
-
-fail:
-	entry->event = NULL;
-	cpu_buf->sample_lost_overflow++;
-}
-
-int oprofile_add_data(struct op_entry *entry, unsigned long val)
-{
-	if (!entry->event)
-		return 0;
-	return op_cpu_buffer_add_data(entry, val);
-}
-
-int oprofile_add_data64(struct op_entry *entry, u64 val)
-{
-	if (!entry->event)
-		return 0;
-	if (op_cpu_buffer_get_size(entry) < 2)
-		/*
-		 * the function returns 0 to indicate a too small
-		 * buffer, even if there is some space left
-		 */
-		return 0;
-	if (!op_cpu_buffer_add_data(entry, (u32)val))
-		return 0;
-	return op_cpu_buffer_add_data(entry, (u32)(val >> 32));
-}
-
-int oprofile_write_commit(struct op_entry *entry)
-{
-	if (!entry->event)
-		return -EINVAL;
-	return op_cpu_buffer_write_commit(entry);
-}
-
-void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event)
-{
-	struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-	log_sample(cpu_buf, pc, 0, is_kernel, event, NULL);
-}
-
-void oprofile_add_trace(unsigned long pc)
-{
-	struct oprofile_cpu_buffer *cpu_buf = this_cpu_ptr(&op_cpu_buffer);
-
-	if (!cpu_buf->tracing)
-		return;
-
-	/*
-	 * broken frame can give an eip with the same value as an
-	 * escape code, abort the trace if we get it
-	 */
-	if (pc == ESCAPE_CODE)
-		goto fail;
-
-	if (op_add_sample(cpu_buf, pc, 0))
-		goto fail;
-
-	return;
-fail:
-	cpu_buf->tracing = 0;
-	cpu_buf->backtrace_aborted++;
-	return;
-}
-
-/*
- * This serves to avoid cpu buffer overflow, and makes sure
- * the task mortuary progresses
- *
- * By using schedule_delayed_work_on and then schedule_delayed_work
- * we guarantee this will stay on the correct cpu
- */
-static void wq_sync_buffer(struct work_struct *work)
-{
-	struct oprofile_cpu_buffer *b =
-		container_of(work, struct oprofile_cpu_buffer, work.work);
-	if (b->cpu != smp_processor_id() && !cpu_online(b->cpu)) {
-		cancel_delayed_work(&b->work);
-		return;
-	}
-	sync_buffer(b->cpu);
-
-	/* don't re-add the work if we're shutting down */
-	if (work_enabled)
-		schedule_delayed_work(&b->work, DEFAULT_TIMER_EXPIRE);
-}