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/* SPDX-License-Identifier: MIT */
/* Copyright © 2025 Intel Corporation */
#ifndef __I915_PTR_UTIL_H__
#define __I915_PTR_UTIL_H__
#include <linux/types.h>
#define ptr_mask_bits(ptr, n) ({ \
unsigned long __v = (unsigned long)(ptr); \
(typeof(ptr))(__v & -BIT(n)); \
})
#define ptr_unmask_bits(ptr, n) ((unsigned long)(ptr) & (BIT(n) - 1))
#define ptr_unpack_bits(ptr, bits, n) ({ \
unsigned long __v = (unsigned long)(ptr); \
*(bits) = __v & (BIT(n) - 1); \
(typeof(ptr))(__v & -BIT(n)); \
})
#define ptr_pack_bits(ptr, bits, n) ({ \
unsigned long __bits = (bits); \
GEM_BUG_ON(__bits & -BIT(n)); \
((typeof(ptr))((unsigned long)(ptr) | __bits)); \
})
#define ptr_dec(ptr) ({ \
unsigned long __v = (unsigned long)(ptr); \
(typeof(ptr))(__v - 1); \
})
#define ptr_inc(ptr) ({ \
unsigned long __v = (unsigned long)(ptr); \
(typeof(ptr))(__v + 1); \
})
#define page_mask_bits(ptr) ptr_mask_bits(ptr, PAGE_SHIFT)
#define page_unmask_bits(ptr) ptr_unmask_bits(ptr, PAGE_SHIFT)
#define page_pack_bits(ptr, bits) ptr_pack_bits(ptr, bits, PAGE_SHIFT)
#define page_unpack_bits(ptr, bits) ptr_unpack_bits(ptr, bits, PAGE_SHIFT)
static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
{
return a - b;
}
#define u64_to_ptr(T, x) ({ \
typecheck(u64, x); \
(T *)(uintptr_t)(x); \
})
/*
* container_of_user: Extract the superclass from a pointer to a member.
*
* Exactly like container_of() with the exception that it plays nicely
* with sparse for __user @ptr.
*/
#define container_of_user(ptr, type, member) ({ \
void __user *__mptr = (void __user *)(ptr); \
BUILD_BUG_ON_MSG(!__same_type(*(ptr), typeof_member(type, member)) && \
!__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
((type __user *)(__mptr - offsetof(type, member))); })
#endif /* __I915_PTR_UTIL_H__ */
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