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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Broadcom
*/
/**
* DOC: VC4 V3D performance monitor module
*
* The V3D block provides 16 hardware counters which can count various events.
*/
#include "vc4_drv.h"
#include "vc4_regs.h"
#define VC4_PERFMONID_MIN 1
#define VC4_PERFMONID_MAX U32_MAX
void vc4_perfmon_get(struct vc4_perfmon *perfmon)
{
if (perfmon)
refcount_inc(&perfmon->refcnt);
}
void vc4_perfmon_put(struct vc4_perfmon *perfmon)
{
if (perfmon && refcount_dec_and_test(&perfmon->refcnt))
kfree(perfmon);
}
void vc4_perfmon_start(struct vc4_dev *vc4, struct vc4_perfmon *perfmon)
{
unsigned int i;
u32 mask;
if (WARN_ON_ONCE(!perfmon || vc4->active_perfmon))
return;
for (i = 0; i < perfmon->ncounters; i++)
V3D_WRITE(V3D_PCTRS(i), perfmon->events[i]);
mask = GENMASK(perfmon->ncounters - 1, 0);
V3D_WRITE(V3D_PCTRC, mask);
V3D_WRITE(V3D_PCTRE, V3D_PCTRE_EN | mask);
vc4->active_perfmon = perfmon;
}
void vc4_perfmon_stop(struct vc4_dev *vc4, struct vc4_perfmon *perfmon,
bool capture)
{
unsigned int i;
if (WARN_ON_ONCE(!vc4->active_perfmon ||
perfmon != vc4->active_perfmon))
return;
if (capture) {
for (i = 0; i < perfmon->ncounters; i++)
perfmon->counters[i] += V3D_READ(V3D_PCTR(i));
}
V3D_WRITE(V3D_PCTRE, 0);
vc4->active_perfmon = NULL;
}
struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
{
struct vc4_perfmon *perfmon;
mutex_lock(&vc4file->perfmon.lock);
perfmon = idr_find(&vc4file->perfmon.idr, id);
vc4_perfmon_get(perfmon);
mutex_unlock(&vc4file->perfmon.lock);
return perfmon;
}
void vc4_perfmon_open_file(struct vc4_file *vc4file)
{
mutex_init(&vc4file->perfmon.lock);
idr_init(&vc4file->perfmon.idr);
}
static int vc4_perfmon_idr_del(int id, void *elem, void *data)
{
struct vc4_perfmon *perfmon = elem;
vc4_perfmon_put(perfmon);
return 0;
}
void vc4_perfmon_close_file(struct vc4_file *vc4file)
{
mutex_lock(&vc4file->perfmon.lock);
idr_for_each(&vc4file->perfmon.idr, vc4_perfmon_idr_del, NULL);
idr_destroy(&vc4file->perfmon.idr);
mutex_unlock(&vc4file->perfmon.lock);
}
int vc4_perfmon_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct vc4_file *vc4file = file_priv->driver_priv;
struct drm_vc4_perfmon_create *req = data;
struct vc4_perfmon *perfmon;
unsigned int i;
int ret;
/* Number of monitored counters cannot exceed HW limits. */
if (req->ncounters > DRM_VC4_MAX_PERF_COUNTERS ||
!req->ncounters)
return -EINVAL;
/* Make sure all events are valid. */
for (i = 0; i < req->ncounters; i++) {
if (req->events[i] >= VC4_PERFCNT_NUM_EVENTS)
return -EINVAL;
}
perfmon = kzalloc(struct_size(perfmon, counters, req->ncounters),
GFP_KERNEL);
if (!perfmon)
return -ENOMEM;
for (i = 0; i < req->ncounters; i++)
perfmon->events[i] = req->events[i];
perfmon->ncounters = req->ncounters;
refcount_set(&perfmon->refcnt, 1);
mutex_lock(&vc4file->perfmon.lock);
ret = idr_alloc(&vc4file->perfmon.idr, perfmon, VC4_PERFMONID_MIN,
VC4_PERFMONID_MAX, GFP_KERNEL);
mutex_unlock(&vc4file->perfmon.lock);
if (ret < 0) {
kfree(perfmon);
return ret;
}
req->id = ret;
return 0;
}
int vc4_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct vc4_file *vc4file = file_priv->driver_priv;
struct drm_vc4_perfmon_destroy *req = data;
struct vc4_perfmon *perfmon;
mutex_lock(&vc4file->perfmon.lock);
perfmon = idr_remove(&vc4file->perfmon.idr, req->id);
mutex_unlock(&vc4file->perfmon.lock);
if (!perfmon)
return -EINVAL;
vc4_perfmon_put(perfmon);
return 0;
}
int vc4_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct vc4_file *vc4file = file_priv->driver_priv;
struct drm_vc4_perfmon_get_values *req = data;
struct vc4_perfmon *perfmon;
int ret;
mutex_lock(&vc4file->perfmon.lock);
perfmon = idr_find(&vc4file->perfmon.idr, req->id);
vc4_perfmon_get(perfmon);
mutex_unlock(&vc4file->perfmon.lock);
if (!perfmon)
return -EINVAL;
if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->counters,
perfmon->ncounters * sizeof(u64)))
ret = -EFAULT;
else
ret = 0;
vc4_perfmon_put(perfmon);
return ret;
}
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