v4.19.13 snapshot.
diff --git a/include/linux/stm.h b/include/linux/stm.h
new file mode 100644
index 0000000..c6f577a
--- /dev/null
+++ b/include/linux/stm.h
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Trace Module (STM) infrastructure apis
+ * Copyright (C) 2014 Intel Corporation.
+ */
+
+#ifndef _STM_H_
+#define _STM_H_
+
+#include <linux/device.h>
+
+/**
+ * enum stp_packet_type - STP packets that an STM driver sends
+ */
+enum stp_packet_type {
+ STP_PACKET_DATA = 0,
+ STP_PACKET_FLAG,
+ STP_PACKET_USER,
+ STP_PACKET_MERR,
+ STP_PACKET_GERR,
+ STP_PACKET_TRIG,
+ STP_PACKET_XSYNC,
+};
+
+/**
+ * enum stp_packet_flags - STP packet modifiers
+ */
+enum stp_packet_flags {
+ STP_PACKET_MARKED = 0x1,
+ STP_PACKET_TIMESTAMPED = 0x2,
+};
+
+struct stp_policy;
+
+struct stm_device;
+
+/**
+ * struct stm_data - STM device description and callbacks
+ * @name: device name
+ * @stm: internal structure, only used by stm class code
+ * @sw_start: first STP master available to software
+ * @sw_end: last STP master available to software
+ * @sw_nchannels: number of STP channels per master
+ * @sw_mmiosz: size of one channel's IO space, for mmap, optional
+ * @hw_override: masters in the STP stream will not match the ones
+ * assigned by software, but are up to the STM hardware
+ * @packet: callback that sends an STP packet
+ * @mmio_addr: mmap callback, optional
+ * @link: called when a new stm_source gets linked to us, optional
+ * @unlink: likewise for unlinking, again optional
+ * @set_options: set device-specific options on a channel
+ *
+ * Fill out this structure before calling stm_register_device() to create
+ * an STM device and stm_unregister_device() to destroy it. It will also be
+ * passed back to @packet(), @mmio_addr(), @link(), @unlink() and @set_options()
+ * callbacks.
+ *
+ * Normally, an STM device will have a range of masters available to software
+ * and the rest being statically assigned to various hardware trace sources.
+ * The former is defined by the the range [@sw_start..@sw_end] of the device
+ * description. That is, the lowest master that can be allocated to software
+ * writers is @sw_start and data from this writer will appear is @sw_start
+ * master in the STP stream.
+ *
+ * The @packet callback should adhere to the following rules:
+ * 1) it must return the number of bytes it consumed from the payload;
+ * 2) therefore, if it sent a packet that does not have payload (like FLAG),
+ * it must return zero;
+ * 3) if it does not support the requested packet type/flag combination,
+ * it must return -ENOTSUPP.
+ *
+ * The @unlink callback is called when there are no more active writers so
+ * that the master/channel can be quiesced.
+ */
+struct stm_data {
+ const char *name;
+ struct stm_device *stm;
+ unsigned int sw_start;
+ unsigned int sw_end;
+ unsigned int sw_nchannels;
+ unsigned int sw_mmiosz;
+ unsigned int hw_override;
+ ssize_t (*packet)(struct stm_data *, unsigned int,
+ unsigned int, unsigned int,
+ unsigned int, unsigned int,
+ const unsigned char *);
+ phys_addr_t (*mmio_addr)(struct stm_data *, unsigned int,
+ unsigned int, unsigned int);
+ int (*link)(struct stm_data *, unsigned int,
+ unsigned int);
+ void (*unlink)(struct stm_data *, unsigned int,
+ unsigned int);
+ long (*set_options)(struct stm_data *, unsigned int,
+ unsigned int, unsigned int,
+ unsigned long);
+};
+
+int stm_register_device(struct device *parent, struct stm_data *stm_data,
+ struct module *owner);
+void stm_unregister_device(struct stm_data *stm_data);
+
+struct stm_source_device;
+
+/**
+ * struct stm_source_data - STM source device description and callbacks
+ * @name: device name, will be used for policy lookup
+ * @src: internal structure, only used by stm class code
+ * @nr_chans: number of channels to allocate
+ * @link: called when this source gets linked to an STM device
+ * @unlink: called when this source is about to get unlinked from its STM
+ *
+ * Fill in this structure before calling stm_source_register_device() to
+ * register a source device. Also pass it to unregister and write calls.
+ */
+struct stm_source_data {
+ const char *name;
+ struct stm_source_device *src;
+ unsigned int percpu;
+ unsigned int nr_chans;
+ int (*link)(struct stm_source_data *data);
+ void (*unlink)(struct stm_source_data *data);
+};
+
+int stm_source_register_device(struct device *parent,
+ struct stm_source_data *data);
+void stm_source_unregister_device(struct stm_source_data *data);
+
+int notrace stm_source_write(struct stm_source_data *data, unsigned int chan,
+ const char *buf, size_t count);
+
+#endif /* _STM_H_ */