/*
* 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)
{
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,29)
entry->event = ring_buffer_lock_reserve
(op_ring_buffer_write, sizeof(struct op_sample) +
size * sizeof(entry->sample->data[0]));
#else
entry->event = ring_buffer_lock_reserve
(op_ring_buffer_write, sizeof(struct op_sample) +
size * sizeof(entry->sample->data[0]), &entry->irq_flags);
#endif
if (entry->event)
entry->sample = ring_buffer_event_data(entry->event);
else
entry->sample = NULL;
if (!entry->sample)
return NULL;
entry->size = size;
entry->data = entry->sample->data;
return entry->sample;
}
static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
unsigned long call_site,
const void *ptr)
{
struct ftrace_event_call *call = &event_kmem_free;
struct trace_array *tr = kmemtrace_array;
struct kmemtrace_free_entry *entry;
struct ring_buffer_event *event;
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
if (!event)
return;
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, 0);
entry->ent.type = TRACE_KMEM_FREE;
entry->type_id = type_id;
entry->call_site = call_site;
entry->ptr = ptr;
if (!filter_check_discard(call, entry, tr->buffer, event))
ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
/* Trace allocations */
static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
unsigned long call_site,
const void *ptr,
size_t bytes_req,
size_t bytes_alloc,
gfp_t gfp_flags,
int node)
{
struct ftrace_event_call *call = &event_kmem_alloc;
struct trace_array *tr = kmemtrace_array;
struct kmemtrace_alloc_entry *entry;
struct ring_buffer_event *event;
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
if (!event)
return;
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, 0);
entry->ent.type = TRACE_KMEM_ALLOC;
entry->type_id = type_id;
entry->call_site = call_site;
entry->ptr = ptr;
entry->bytes_req = bytes_req;
entry->bytes_alloc = bytes_alloc;
entry->gfp_flags = gfp_flags;
entry->node = node;
if (!filter_check_discard(call, entry, tr->buffer, event))
ring_buffer_unlock_commit(tr->buffer, event);
trace_wake_up();
}
void trace_boot(struct boot_trace *it, initcall_t fn)
{
struct ring_buffer_event *event;
struct trace_boot *entry;
struct trace_array_cpu *data;
unsigned long irq_flags;
struct trace_array *tr = boot_trace;
if (!trace_boot_enabled)
return;
/* Get its name now since this function could
* disappear because it is in the .init section.
*/
sprint_symbol(it->func, (unsigned long)fn);
preempt_disable();
data = tr->data[smp_processor_id()];
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
&irq_flags);
if (!event)
goto out;
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, 0);
entry->ent.type = TRACE_BOOT;
entry->initcall = *it;
ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
trace_wake_up();
out:
preempt_enable();
}
/*
* 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;
}
void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
{
struct ring_buffer_event *event;
struct hw_branch_entry *entry;
unsigned long irq;
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
if (!event)
return;
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, from);
entry->ent.type = TRACE_HW_BRANCHES;
entry->ent.cpu = smp_processor_id();
entry->from = from;
entry->to = to;
ring_buffer_unlock_commit(tr->buffer, event, irq);
}
void autoconf_test(void)
{
(void)ring_buffer_lock_reserve(NULL, 0, 0);
}
