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  *   €l–Ь4э( ©і( 	ЕЂfаB¦-яБѓ`_†I|ҐЏ+БА 	Е    /* 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_ */
     €їВѓѕБА     /* SPDX-License-Identifier: GPL-2.0-only */
/* A pointer that can point to either kernel or userspace memory. */
#ifndef _LINUX_BPFPTR_H
#define _LINUX_BPFPTR_H

#include <linux/mm.h>
#include <linux/sockptr.h>

typedef sockptr_t bpfptr_t;

static inline bool bpfptr_is_kernel(bpfptr_t bpfptr)
{
	return bpfptr.is_kernel;
}

static inline bpfptr_t KERNEL_BPFPTR(void *p)
{
	return (bpfptr_t) { .kernel = p, .is_kernel = true };
}

static inline bpfptr_t USER_BPFPTR(void __user *p)
{
	return (bpfptr_t) { .user = p };
}

static inline bpfptr_t make_bpfptr(u64 addr, bool is_kernel)
{
	if (is_kernel)
		return KERNEL_BPFPTR((void*) (uintptr_t) addr);
	else
		return USER_BPFPTR(u64_to_user_ptr(addr));
}

static inline bool bpfptr_is_null(bpfptr_t bpfptr)
{
	if (bpfptr_is_kernel(bpfptr))
		return !bpfptr.kernel;
	return !bpfptr.user;
}

static inline void bpfptr_add(bpfptr_t *bpfptr, size_t val)
{
	if (bpfptr_is_kernel(*bpfptr))
		bpfptr->kernel += val;
	else
		bpfptr->user += val;
}

static inline int copy_from_bpfptr_offset(void *dst, bpfptr_t src,
					  size_t offset, size_t size)
{
	if (!bpfptr_is_kernel(src))
		return copy_from_user(dst, src.user + offset, size);
	return copy_from_kernel_nofault(dst, src.kernel + offset, size);
}

static inline int copy_from_bpfptr(void *dst, bpfptr_t src, size_t size)
{
	return copy_from_bpfptr_offset(dst, src, 0, size);
}

static inline int copy_to_bpfptr_offset(bpfptr_t dst, size_t offset,
					const void *src, size_t size)
{
	return copy_to_soc