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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_UINTR_H
#define _ASM_X86_UINTR_H
#ifdef CONFIG_X86_USER_INTERRUPTS
/* User Posted Interrupt Descriptor (UPID) */
struct uintr_upid {
struct {
u8 status; /* bit 0: ON, bit 1: SN, bit 2-7: reserved */
u8 reserved1; /* Reserved */
u8 nv; /* Notification vector */
u8 reserved2; /* Reserved */
u32 ndst; /* Notification destination */
} nc __packed; /* Notification control */
u64 puir; /* Posted user interrupt requests */
} __aligned(64);
/* UPID Notification control status */
#define UPID_ON 0x0 /* Outstanding notification */
#define UPID_SN 0x1 /* Suppressed notification */
struct uintr_upid_ctx {
struct list_head node;
struct task_struct *task; /* Receiver task */
struct uintr_upid *upid;
refcount_t refs;
bool receiver_active; /* Flag for UPID being mapped to a receiver */
bool waiting;
};
struct uintr_receiver_info {
struct uintr_upid_ctx *upid_ctx; /* UPID context */
struct callback_head twork; /* Task work head */
u64 uvec; /* Vector number */
};
struct uintr_sender_info {
struct list_head node;
struct uintr_uitt_ctx *uitt_ctx;
struct task_struct *task;
struct uintr_upid_ctx *r_upid_ctx; /* Receiver's UPID context */
struct callback_head twork; /* Task work head */
unsigned int uitt_index;
};
bool uintr_arch_enabled(void);
int do_uintr_register_handler(u64 handler);
int do_uintr_unregister_handler(void);
int do_uintr_register_vector(struct uintr_receiver_info *r_info);
void do_uintr_unregister_vector(struct uintr_receiver_info *r_info);
int do_uintr_register_sender(struct uintr_receiver_info *r_info,
struct uintr_sender_info *s_info);
void do_uintr_unregister_sender(struct uintr_receiver_info *r_info,
struct uintr_sender_info *s_info);
void uintr_free(struct task_struct *task);
/* TODO: Inline the context switch related functions */
void switch_uintr_prepare(struct task_struct *prev);
void switch_uintr_return(void);
int uintr_receiver_wait(ktime_t *expires);
void uintr_wake_up_process(void);
int do_uintr_event_init(int flag);
void uintr_event_write(void);
#else /* !CONFIG_X86_USER_INTERRUPTS */
static inline void uintr_free(struct task_struct *task) {}
static inline void switch_uintr_prepare(struct task_struct *prev) {}
static inline void switch_uintr_return(void) {}
static inline void uintr_wake_up_process(void) {}
void uintr_event_write(void) {}
#endif /* CONFIG_X86_USER_INTERRUPTS */
#endif /* _ASM_X86_UINTR_H */
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