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/* 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 /* 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 m