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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 <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_ */
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