1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/disp/msm_disp_snapshot.h b/drivers/gpu/drm/msm/disp/msm_disp_snapshot.h
new file mode 100644
index 000000000..b5f452bd7
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/msm_disp_snapshot.h
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef MSM_DISP_SNAPSHOT_H_
+#define MSM_DISP_SNAPSHOT_H_
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_device.h>
+#include "../../../drm_crtc_internal.h"
+#include <drm/drm_print.h>
+#include <drm/drm_atomic.h>
+#include <linux/debugfs.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/ktime.h>
+#include <linux/uaccess.h>
+#include <linux/dma-buf.h>
+#include <linux/slab.h>
+#include <linux/list_sort.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/kthread.h>
+#include <linux/devcoredump.h>
+#include "msm_kms.h"
+
+#define MSM_DISP_SNAPSHOT_MAX_BLKS		10
+
+/* debug option to print the registers in logs */
+#define MSM_DISP_SNAPSHOT_DUMP_IN_CONSOLE 0
+
+/* print debug ranges in groups of 4 u32s */
+#define REG_DUMP_ALIGN		16
+
+/**
+ * struct msm_disp_state - structure to store current dpu state
+ * @dev: device pointer
+ * @drm_dev: drm device pointer
+ * @atomic_state: atomic state duplicated at the time of the error
+ * @time: timestamp at which the coredump was captured
+ */
+struct msm_disp_state {
+	struct device *dev;
+	struct drm_device *drm_dev;
+
+	struct list_head blocks;
+
+	struct drm_atomic_state *atomic_state;
+
+	struct timespec64 time;
+};
+
+/**
+ * struct msm_disp_state_block - structure to store each hardware block state
+ * @name: name of the block
+ * @drm_dev: handle to the linked list head
+ * @size: size of the register space of this hardware block
+ * @state: array holding the register dump of this hardware block
+ * @base_addr: starting address of this hardware block's register space
+ */
+struct msm_disp_state_block {
+	char name[SZ_128];
+	struct list_head node;
+	unsigned int size;
+	u32 *state;
+	void __iomem *base_addr;
+};
+
+/**
+ * msm_disp_snapshot_init - initialize display snapshot
+ * @drm_dev:	drm device handle
+ *
+ * Returns:		0 or -ERROR
+ */
+int msm_disp_snapshot_init(struct drm_device *drm_dev);
+
+/**
+ * msm_disp_snapshot_destroy - destroy the display snapshot
+ * @drm_dev:    drm device handle
+ *
+ * Returns:	none
+ */
+void msm_disp_snapshot_destroy(struct drm_device *drm_dev);
+
+/**
+ * msm_disp_snapshot_state_sync - synchronously snapshot display state
+ * @kms:  the kms object
+ *
+ * Returns state or error
+ *
+ * Must be called with &kms->dump_mutex held
+ */
+struct msm_disp_state *msm_disp_snapshot_state_sync(struct msm_kms *kms);
+
+/**
+ * msm_disp_snapshot_state - trigger to dump the display snapshot
+ * @drm_dev:	handle to drm device
+
+ * Returns:	none
+ */
+void msm_disp_snapshot_state(struct drm_device *drm_dev);
+
+/**
+ * msm_disp_state_print - print out the current dpu state
+ * @disp_state:	    handle to drm device
+ * @p:	    handle to drm printer
+ *
+ * Returns:	none
+ */
+void msm_disp_state_print(struct msm_disp_state *disp_state, struct drm_printer *p);
+
+/**
+ * msm_disp_snapshot_capture_state - utility to capture atomic state and hw registers
+ * @disp_state:	    handle to msm_disp_state struct
+
+ * Returns:	none
+ */
+void msm_disp_snapshot_capture_state(struct msm_disp_state *disp_state);
+
+/**
+ * msm_disp_state_free - free the memory after the coredump has been read
+ * @data:	    handle to struct msm_disp_state
+
+ * Returns: none
+ */
+void msm_disp_state_free(void *data);
+
+/**
+ * msm_disp_snapshot_add_block - add a hardware block with its register dump
+ * @disp_state:	    handle to struct msm_disp_state
+ * @name:           name of the hardware block
+ * @len:            size of the register space of the hardware block
+ * @base_addr:      starting address of the register space of the hardware block
+ * @fmt:            format in which the block names need to be printed
+ *
+ * Returns: none
+ */
+__printf(4, 5)
+void msm_disp_snapshot_add_block(struct msm_disp_state *disp_state, u32 len,
+		void __iomem *base_addr, const char *fmt, ...);
+
+#endif /* MSM_DISP_SNAPSHOT_H_ */