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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 Raspberry Pi
*/
#include "v3d_drv.h"
#include "v3d_regs.h"
#define V3D_PERFMONID_MIN 1
#define V3D_PERFMONID_MAX U32_MAX
void v3d_perfmon_get(struct v3d_perfmon *perfmon)
{
if (perfmon)
refcount_inc(&perfmon->refcnt);
}
void v3d_perfmon_put(struct v3d_perfmon *perfmon)
{
if (perfmon && refcount_dec_and_test(&perfmon->refcnt))
kfree(perfmon);
}
void v3d_perfmon_start(struct v3d_dev *v3d, struct v3d_perfmon *perfmon)
{
unsigned int i;
u32 mask;
u8 ncounters;
if (WARN_ON_ONCE(!perfmon || v3d->active_perfmon))
return;
ncounters = perfmon->ncounters;
mask = GENMASK(ncounters - 1, 0);
for (i = 0; i < ncounters; i++) {
u32 source = i / 4;
u32 channel = V3D_SET_FIELD(perfmon->counters[i], V3D_PCTR_S0);
i++;
channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0,
V3D_PCTR_S1);
i++;
channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0,
V3D_PCTR_S2);
i++;
channel |= V3D_SET_FIELD(i < ncounters ? perfmon->counters[i] : 0,
V3D_PCTR_S3);
V3D_CORE_WRITE(0, V3D_V4_PCTR_0_SRC_X(source), channel);
}
V3D_CORE_WRITE(0, V3D_V4_PCTR_0_CLR, mask);
V3D_CORE_WRITE(0, V3D_PCTR_0_OVERFLOW, mask);
V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, mask);
v3d->active_perfmon = perfmon;
}
void v3d_perfmon_stop(struct v3d_dev *v3d, struct v3d_perfmon *perfmon,
bool capture)
{
unsigned int i;
if (!perfmon || !v3d->active_perfmon)
return;
mutex_lock(&perfmon->lock);
if (perfmon != v3d->active_perfmon) {
mutex_unlock(&perfmon->lock);
return;
}
if (capture)
for (i = 0; i < perfmon->ncounters; i++)
perfmon->values[i] += V3D_CORE_READ(0, V3D_PCTR_0_PCTRX(i));
V3D_CORE_WRITE(0, V3D_V4_PCTR_0_EN, 0);
v3d->active_perfmon = NULL;
mutex_unlock(&perfmon->lock);
}
struct v3d_perfmon *v3d_perfmon_find(struct v3d_file_priv *v3d_priv, int id)
{
struct v3d_perfmon *perfmon;
mutex_lock(&v3d_priv->perfmon.lock);
perfmon = idr_find(&v3d_priv->perfmon.idr, id);
v3d_perfmon_get(perfmon);
mutex_unlock(&v3d_priv->perfmon.lock);
return perfmon;
}
void v3d_perfmon_open_file(struct v3d_file_priv *v3d_priv)
{
mutex_init(&v3d_priv->perfmon.lock);
idr_init_base(&v3d_priv->perfmon.idr, 1);
}
static int v3d_perfmon_idr_del(int id, void *elem, void *data)
{
struct v3d_perfmon *perfmon = elem;
v3d_perfmon_put(perfmon);
return 0;
}
void v3d_perfmon_close_file(struct v3d_file_priv *v3d_priv)
{
mutex_lock(&v3d_priv->perfmon.lock);
idr_for_each(&v3d_priv->perfmon.idr, v3d_perfmon_idr_del, NULL);
idr_destroy(&v3d_priv->perfmon.idr);
mutex_unlock(&v3d_priv->perfmon.lock);
}
int v3d_perfmon_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
struct drm_v3d_perfmon_create *req = data;
struct v3d_perfmon *perfmon;
unsigned int i;
int ret;
/* Number of monitored counters cannot exceed HW limits. */
if (req->ncounters > DRM_V3D_MAX_PERF_COUNTERS ||
!req->ncounters)
return -EINVAL;
/* Make sure all counters are valid. */
for (i = 0; i < req->ncounters; i++) {
if (req->counters[i] >= V3D_PERFCNT_NUM)
return -EINVAL;
}
perfmon = kzalloc(struct_size(perfmon, values, req->ncounters),
GFP_KERNEL);
if (!perfmon)
return -ENOMEM;
for (i = 0; i < req->ncounters; i++)
perfmon->counters[i] = req->counters[i];
perfmon->ncounters = req->ncounters;
refcount_set(&perfmon->refcnt, 1);
mutex_init(&perfmon->lock);
mutex_lock(&v3d_priv->perfmon.lock);
ret = idr_alloc(&v3d_priv->perfmon.idr, perfmon, V3D_PERFMONID_MIN,
V3D_PERFMONID_MAX, GFP_KERNEL);
mutex_unlock(&v3d_priv->perfmon.lock);
if (ret < 0) {
kfree(perfmon);
return ret;
}
req->id = ret;
return 0;
}
int v3d_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
struct drm_v3d_perfmon_destroy *req = data;
struct v3d_perfmon *perfmon;
mutex_lock(&v3d_priv->perfmon.lock);
perfmon = idr_remove(&v3d_priv->perfmon.idr, req->id);
mutex_unlock(&v3d_priv->perfmon.lock);
if (!perfmon)
return -EINVAL;
v3d_perfmon_put(perfmon);
return 0;
}
int v3d_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct v3d_dev *v3d = to_v3d_dev(dev);
struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
struct drm_v3d_perfmon_get_values *req = data;
struct v3d_perfmon *perfmon;
int ret = 0;
if (req->pad != 0)
return -EINVAL;
mutex_lock(&v3d_priv->perfmon.lock);
perfmon = idr_find(&v3d_priv->perfmon.idr, req->id);
v3d_perfmon_get(perfmon);
mutex_unlock(&v3d_priv->perfmon.lock);
if (!perfmon)
return -EINVAL;
v3d_perfmon_stop(v3d, perfmon, true);
if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->values,
perfmon->ncounters * sizeof(u64)))
ret = -EFAULT;
v3d_perfmon_put(perfmon);
return ret;
}
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