1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/disp/msm_disp_snapshot.c b/drivers/gpu/drm/msm/disp/msm_disp_snapshot.c
new file mode 100644
index 000000000..e75b97127
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/msm_disp_snapshot.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+ */
+
+#define pr_fmt(fmt)	"[drm:%s:%d] " fmt, __func__, __LINE__
+
+#include "msm_disp_snapshot.h"
+
+static ssize_t __maybe_unused disp_devcoredump_read(char *buffer, loff_t offset,
+		size_t count, void *data, size_t datalen)
+{
+	struct drm_print_iterator iter;
+	struct drm_printer p;
+	struct msm_disp_state *disp_state;
+
+	disp_state = data;
+
+	iter.data = buffer;
+	iter.offset = 0;
+	iter.start = offset;
+	iter.remain = count;
+
+	p = drm_coredump_printer(&iter);
+
+	msm_disp_state_print(disp_state, &p);
+
+	return count - iter.remain;
+}
+
+struct msm_disp_state *
+msm_disp_snapshot_state_sync(struct msm_kms *kms)
+{
+	struct drm_device *drm_dev = kms->dev;
+	struct msm_disp_state *disp_state;
+
+	WARN_ON(!mutex_is_locked(&kms->dump_mutex));
+
+	disp_state = kzalloc(sizeof(struct msm_disp_state), GFP_KERNEL);
+	if (!disp_state)
+		return ERR_PTR(-ENOMEM);
+
+	disp_state->dev = drm_dev->dev;
+	disp_state->drm_dev = drm_dev;
+
+	INIT_LIST_HEAD(&disp_state->blocks);
+
+	msm_disp_snapshot_capture_state(disp_state);
+
+	return disp_state;
+}
+
+static void _msm_disp_snapshot_work(struct kthread_work *work)
+{
+	struct msm_kms *kms = container_of(work, struct msm_kms, dump_work);
+	struct msm_disp_state *disp_state;
+	struct drm_printer p;
+
+	/* Serialize dumping here */
+	mutex_lock(&kms->dump_mutex);
+	disp_state = msm_disp_snapshot_state_sync(kms);
+	mutex_unlock(&kms->dump_mutex);
+
+	if (IS_ERR(disp_state))
+		return;
+
+	if (MSM_DISP_SNAPSHOT_DUMP_IN_CONSOLE) {
+		p = drm_info_printer(disp_state->drm_dev->dev);
+		msm_disp_state_print(disp_state, &p);
+	}
+
+	/*
+	 * If COREDUMP is disabled, the stub will call the free function.
+	 * If there is a codedump pending for the device, the dev_coredumpm()
+	 * will also free new coredump state.
+	 */
+	dev_coredumpm(disp_state->dev, THIS_MODULE, disp_state, 0, GFP_KERNEL,
+			disp_devcoredump_read, msm_disp_state_free);
+}
+
+void msm_disp_snapshot_state(struct drm_device *drm_dev)
+{
+	struct msm_drm_private *priv;
+	struct msm_kms *kms;
+
+	if (!drm_dev) {
+		DRM_ERROR("invalid params\n");
+		return;
+	}
+
+	priv = drm_dev->dev_private;
+	kms = priv->kms;
+
+	kthread_queue_work(kms->dump_worker, &kms->dump_work);
+}
+
+int msm_disp_snapshot_init(struct drm_device *drm_dev)
+{
+	struct msm_drm_private *priv;
+	struct msm_kms *kms;
+
+	if (!drm_dev) {
+		DRM_ERROR("invalid params\n");
+		return -EINVAL;
+	}
+
+	priv = drm_dev->dev_private;
+	kms = priv->kms;
+
+	mutex_init(&kms->dump_mutex);
+
+	kms->dump_worker = kthread_create_worker(0, "%s", "disp_snapshot");
+	if (IS_ERR(kms->dump_worker))
+		DRM_ERROR("failed to create disp state task\n");
+
+	kthread_init_work(&kms->dump_work, _msm_disp_snapshot_work);
+
+	return 0;
+}
+
+void msm_disp_snapshot_destroy(struct drm_device *drm_dev)
+{
+	struct msm_kms *kms;
+	struct msm_drm_private *priv;
+
+	if (!drm_dev) {
+		DRM_ERROR("invalid params\n");
+		return;
+	}
+
+	priv = drm_dev->dev_private;
+	kms = priv->kms;
+
+	if (kms->dump_worker)
+		kthread_destroy_worker(kms->dump_worker);
+
+	mutex_destroy(&kms->dump_mutex);
+}