mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 00:40:03 +00:00
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
![]() |
/* 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_ */
|