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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_UNWIND_USER_DEFERRED_TYPES_H
#define _LINUX_UNWIND_USER_DEFERRED_TYPES_H
#include <linux/types.h>
#include <linux/atomic.h>
struct unwind_cache {
unsigned long unwind_completed;
unsigned int nr_entries;
unsigned long entries[];
};
/*
* The unwind_task_id is a unique identifier that maps to a user space
* stacktrace. It is generated the first time a deferred user space
* stacktrace is requested after a task has entered the kerenl and
* is cleared to zero when it exits. The mapped id will be a non-zero
* number.
*
* To simplify the generation of the 64 bit number, 32 bits will be
* the CPU it was generated on, and the other 32 bits will be a per
* cpu counter that gets incremented by two every time a new identifier
* is generated. The LSB will always be set to keep the value
* from being zero.
*/
union unwind_task_id {
struct {
u32 cpu;
u32 cnt;
};
u64 id;
};
struct unwind_task_info {
atomic_long_t unwind_mask;
struct unwind_cache *cache;
struct callback_head work;
union unwind_task_id id;
};
struct unwind_work;
struct unwind_stacktrace;
typedef void (*unwind_callback_t)(struct unwind_work *work,
struct unwind_stacktrace *trace,
u64 cookie);
struct unwind_work {
struct list_head list;
unwind_callback_t func;
int bit;
};
#endif /* _LINUX_UNWIND_USER_DEFERRED_TYPES_H */
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