1 files changed, 188 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vc4/vc4_perfmon.c b/drivers/gpu/drm/vc4/vc4_perfmon.c
new file mode 100644
index 000000000000..437e7a27f21d
--- /dev/null
+++ b/drivers/gpu/drm/vc4/vc4_perfmon.c
@@ -0,0 +1,188 @@
+// 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(sizeof(*perfmon) + (req->ncounters * sizeof(u64)),
+                          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;
+}