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/**
* Copyright (C) ARM Limited 2010-2012. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "gator.h"
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/time.h>
#include <linux/math64.h>
#ifdef MALI_SUPPORT
#include "linux/mali_linux_trace.h"
#endif
#include "gator_trace_gpu.h"
#define ACTIVITY_START 1
#define ACTIVITY_STOP 2
/* Note whether tracepoints have been registered */
static int mali_trace_registered;
static int gpu_trace_registered;
#define GPU_OVERFLOW -1
#define GPU_START 1
#define GPU_STOP 2
#define GPU_UNIT_VP 1
#define GPU_UNIT_FP 2
#define TRACESIZE (8*1024)
static DEFINE_PER_CPU(uint64_t *[2], theGpuTraceBuf);
static DEFINE_PER_CPU(int, theGpuTraceSel);
static DEFINE_PER_CPU(int, theGpuTracePos);
static DEFINE_PER_CPU(int, theGpuTraceErr);
int gator_trace_gpu_read(long long **buffer);
static void probe_gpu_write(int type, int unit, int core, struct task_struct* task)
{
int tracePos;
unsigned long flags;
uint64_t *traceBuf, time;
int pid, tgid;
int cpu = smp_processor_id();
if (!per_cpu(theGpuTraceBuf, cpu)[per_cpu(theGpuTraceSel, cpu)])
return;
if (task) {
tgid = (int)task->tgid;
pid = (int)task->pid;
} else {
tgid = pid = 0;
}
// disable interrupts to synchronize with gator_trace_gpu_read(); spinlocks not needed since percpu buffers are used
local_irq_save(flags);
time = gator_get_time();
tracePos = per_cpu(theGpuTracePos, cpu);
traceBuf = per_cpu(theGpuTraceBuf, cpu)[per_cpu(theGpuTraceSel, cpu)];
if (tracePos < (TRACESIZE - 100)) {
// capture
traceBuf[tracePos++] = type;
traceBuf[tracePos++] = time;
traceBuf[tracePos++] = unit;
traceBuf[tracePos++] = core;
traceBuf[tracePos++] = tgid;
traceBuf[tracePos++] = pid;
} else if (!per_cpu(theGpuTraceErr, cpu)) {
per_cpu(theGpuTraceErr, cpu) = 1;
traceBuf[tracePos++] = GPU_OVERFLOW;
traceBuf[tracePos++] = time;
traceBuf[tracePos++] = 0;
traceBuf[tracePos++] = 0;
traceBuf[tracePos++] = 0;
traceBuf[tracePos++] = 0;
pr_debug("gator: gpu trace overflow\n");
}
per_cpu(theGpuTracePos, cpu) = tracePos;
local_irq_restore(flags);
}
#ifdef MALI_SUPPORT
enum components {
COMPONENT_VP0 = 1,
COMPONENT_FP0 = 5,
COMPONENT_FP1,
COMPONENT_FP2,
COMPONENT_FP3,
COMPONENT_FP4,
COMPONENT_FP5,
COMPONENT_FP6,
COMPONENT_FP7,
};
GATOR_DEFINE_PROBE(mali_timeline_event, TP_PROTO(unsigned int event_id, unsigned int d0, unsigned int d1, unsigned int d2, unsigned int d3, unsigned int d4))
{
unsigned int component, state;
// do as much work as possible before disabling interrupts
component = (event_id >> 16) & 0xF;
state = (event_id >> 24) & 0xF;
if ((component == COMPONENT_VP0) || (component >= COMPONENT_FP0 && component <= COMPONENT_FP7)) {
if (state == ACTIVITY_START || state == ACTIVITY_STOP) {
unsigned int type = (state == ACTIVITY_START) ? GPU_START : GPU_STOP;
unsigned int unit = (component < COMPONENT_FP0) ? GPU_UNIT_VP : GPU_UNIT_FP;
unsigned int core = (component < COMPONENT_FP0) ? component - COMPONENT_VP0 : component - COMPONENT_FP0;
struct task_struct* task = (state == ACTIVITY_START) ? (struct task_struct*)d2 : NULL;
probe_gpu_write(type, unit, core, task);
}
}
}
#endif
GATOR_DEFINE_PROBE(gpu_activity_start, TP_PROTO(int gpu_unit, int gpu_core, struct task_struct *p))
{
probe_gpu_write(GPU_START, gpu_unit, gpu_core, p);
}
GATOR_DEFINE_PROBE(gpu_activity_stop, TP_PROTO(int gpu_unit, int gpu_core))
{
probe_gpu_write(GPU_STOP, gpu_unit, gpu_core, NULL);
}
int gator_trace_gpu_start(void)
{
int cpu;
/*
* Returns 0 for installation failed
* Absence of gpu trace points is not an error
*/
gpu_trace_registered = mali_trace_registered = 0;
#ifdef MALI_SUPPORT
if (!GATOR_REGISTER_TRACE(mali_timeline_event)) {
mali_trace_registered = 1;
}
#endif
if (!mali_trace_registered) {
if (GATOR_REGISTER_TRACE(gpu_activity_start)) {
return 0;
}
if (GATOR_REGISTER_TRACE(gpu_activity_stop)) {
GATOR_UNREGISTER_TRACE(gpu_activity_start);
return 0;
}
gpu_trace_registered = 1;
}
if (!gpu_trace_registered && !mali_trace_registered) {
return 0;
}
for_each_present_cpu(cpu) {
per_cpu(theGpuTraceSel, cpu) = 0;
per_cpu(theGpuTracePos, cpu) = 0;
per_cpu(theGpuTraceErr, cpu) = 0;
per_cpu(theGpuTraceBuf, cpu)[0] = kmalloc(TRACESIZE * sizeof(uint64_t), GFP_KERNEL);
per_cpu(theGpuTraceBuf, cpu)[1] = kmalloc(TRACESIZE * sizeof(uint64_t), GFP_KERNEL);
if (!per_cpu(theGpuTraceBuf, cpu)[0] || !per_cpu(theGpuTraceBuf, cpu)[1]) {
#ifdef MALI_SUPPORT
if (mali_trace_registered) {
GATOR_UNREGISTER_TRACE(mali_timeline_event);
}
#endif
if (gpu_trace_registered) {
GATOR_UNREGISTER_TRACE(gpu_activity_stop);
GATOR_UNREGISTER_TRACE(gpu_activity_start);
}
gpu_trace_registered = mali_trace_registered = 0;
return -1;
}
}
return 0;
}
int gator_trace_gpu_offline(long long **buffer)
{
return gator_trace_gpu_read(buffer);
}
void gator_trace_gpu_stop(void)
{
int cpu;
if (gpu_trace_registered || mali_trace_registered) {
for_each_present_cpu(cpu) {
kfree(per_cpu(theGpuTraceBuf, cpu)[0]);
kfree(per_cpu(theGpuTraceBuf, cpu)[1]);
per_cpu(theGpuTraceBuf, cpu)[0] = NULL;
per_cpu(theGpuTraceBuf, cpu)[1] = NULL;
}
#ifdef MALI_SUPPORT
if (mali_trace_registered) {
GATOR_UNREGISTER_TRACE(mali_timeline_event);
}
#endif
if (gpu_trace_registered) {
GATOR_UNREGISTER_TRACE(gpu_activity_stop);
GATOR_UNREGISTER_TRACE(gpu_activity_start);
}
gpu_trace_registered = mali_trace_registered = 0;
}
}
int gator_trace_gpu_read(long long **buffer)
{
int cpu = smp_processor_id();
unsigned long flags;
uint64_t *traceBuf;
int tracePos;
if (!per_cpu(theGpuTraceBuf, cpu)[per_cpu(theGpuTraceSel, cpu)])
return 0;
local_irq_save(flags);
traceBuf = per_cpu(theGpuTraceBuf, cpu)[per_cpu(theGpuTraceSel, cpu)];
tracePos = per_cpu(theGpuTracePos, cpu);
per_cpu(theGpuTraceSel, cpu) = !per_cpu(theGpuTraceSel, cpu);
per_cpu(theGpuTracePos, cpu) = 0;
per_cpu(theGpuTraceErr, cpu) = 0;
local_irq_restore(flags);
if (buffer)
*buffer = traceBuf;
return tracePos;
}
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