Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/intel_th.h b/include/linux/intel_th.h
new file mode 100644
index 0000000..9b7f4c2
--- /dev/null
+++ b/include/linux/intel_th.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Intel(R) Trace Hub data structures for implementing buffer sinks.
+ *
+ * Copyright (C) 2019 Intel Corporation.
+ */
+
+#ifndef _INTEL_TH_H_
+#define _INTEL_TH_H_
+
+#include <linux/scatterlist.h>
+
+/* MSC operating modes (MSC_MODE) */
+enum {
+ MSC_MODE_SINGLE = 0,
+ MSC_MODE_MULTI,
+ MSC_MODE_EXI,
+ MSC_MODE_DEBUG,
+};
+
+struct msu_buffer {
+ const char *name;
+ /*
+ * ->assign() called when buffer 'mode' is set to this driver
+ * (aka mode_store())
+ * @device: struct device * of the msc
+ * @mode: allows the driver to set HW mode (see the enum above)
+ * Returns: a pointer to a private structure associated with this
+ * msc or NULL in case of error. This private structure
+ * will then be passed into all other callbacks.
+ */
+ void *(*assign)(struct device *dev, int *mode);
+ /* ->unassign(): some other mode is selected, clean up */
+ void (*unassign)(void *priv);
+ /*
+ * ->alloc_window(): allocate memory for the window of a given
+ * size
+ * @sgt: pointer to sg_table, can be overridden by the buffer
+ * driver, or kept intact
+ * Returns: number of sg table entries <= number of pages;
+ * 0 is treated as an allocation failure.
+ */
+ int (*alloc_window)(void *priv, struct sg_table **sgt,
+ size_t size);
+ void (*free_window)(void *priv, struct sg_table *sgt);
+ /* ->activate(): trace has started */
+ void (*activate)(void *priv);
+ /* ->deactivate(): trace is about to stop */
+ void (*deactivate)(void *priv);
+ /*
+ * ->ready(): window @sgt is filled up to the last block OR
+ * tracing is stopped by the user; this window contains
+ * @bytes data. The window in question transitions into
+ * the "LOCKED" state, indicating that it can't be used
+ * by hardware. To clear this state and make the window
+ * available to the hardware again, call
+ * intel_th_msc_window_unlock().
+ */
+ int (*ready)(void *priv, struct sg_table *sgt, size_t bytes);
+};
+
+int intel_th_msu_buffer_register(const struct msu_buffer *mbuf,
+ struct module *owner);
+void intel_th_msu_buffer_unregister(const struct msu_buffer *mbuf);
+void intel_th_msc_window_unlock(struct device *dev, struct sg_table *sgt);
+
+#define module_intel_th_msu_buffer(__buffer) \
+static int __init __buffer##_init(void) \
+{ \
+ return intel_th_msu_buffer_register(&(__buffer), THIS_MODULE); \
+} \
+module_init(__buffer##_init); \
+static void __exit __buffer##_exit(void) \
+{ \
+ intel_th_msu_buffer_unregister(&(__buffer)); \
+} \
+module_exit(__buffer##_exit);
+
+#endif /* _INTEL_TH_H_ */