arch/x86/include/asm/posted_intr.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _X86_POSTED_INTR_H
#define _X86_POSTED_INTR_H
#include <asm/irq_vectors.h>

#define POSTED_INTR_ON  0
#define POSTED_INTR_SN  1

#define PID_TABLE_ENTRY_VALID 1

/* Posted-Interrupt Descriptor */
struct pi_desc {
	union {
		u32 pir[8];     /* Posted interrupt requested */
		u64 pir64[4];
	};
	union {
		struct {
			u16	notifications; /* Suppress and outstanding bits */
			u8	nv;
			u8	rsvd_2;
			u32	ndst;
		};
		u64 control;
	};
	u32 rsvd[6];
} __aligned(64);

static inline bool pi_test_and_set_on(struct pi_desc *pi_desc)
{
	return test_and_set_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
}

static inline bool pi_test_and_clear_on(struct pi_desc *pi_desc)
{
	return test_and_clear_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
}

static inline bool pi_test_and_clear_sn(struct pi_desc *pi_desc)
{
	return test_and_clear_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
}

static inline bool pi_test_and_set_pir(int vector, struct pi_desc *pi_desc)
{
	return test_and_set_bit(vector, (unsigned long *)pi_desc->pir);
}

static inline bool pi_is_pir_empty(struct pi_desc *pi_desc)
{
	return bitmap_empty((unsigned long *)pi_desc->pir, NR_VECTORS);
}

static inline void pi_set_sn(struct pi_desc *pi_desc)
{
	set_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
}

static inline void pi_set_on(struct pi_desc *pi_desc)
{
	set_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
}

static inline void pi_clear_on(struct pi_desc *pi_desc)
{
	clear_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
}

static inline void pi_clear_sn(struct pi_desc *pi_desc)
{
	clear_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
}

static inline bool pi_test_on(struct pi_desc *pi_desc)
{
	return test_bit(POSTED_INTR_ON, (unsigned long *)&pi_desc->control);
}

static inline bool pi_test_sn(struct pi_desc *pi_desc)
{
	return test_bit(POSTED_INTR_SN, (unsigned long *)&pi_desc->control);
}

/* Non-atomic helpers */
static inline void __pi_set_sn(struct pi_desc *pi_desc)
{
	pi_desc->notifications |= BIT(POSTED_INTR_SN);
}

static inline void __pi_clear_sn(struct pi_desc *pi_desc)
{
	pi_desc->notifications &= ~BIT(POSTED_INTR_SN);
}

#ifdef CONFIG_X86_POSTED_MSI
/*
 * Not all external vectors are subject to interrupt remapping, e.g. IOMMU's
 * own interrupts. Here we do not distinguish them since those vector bits in
 * PIR will always be zero.
 */
static inline bool pi_pending_this_cpu(unsigned int vector)
{
	struct pi_desc *pid = this_cpu_ptr(&posted_msi_pi_desc);

	if (WARN_ON_ONCE(vector > NR_VECTORS || vector < FIRST_EXTERNAL_VECTOR))
		return false;

	return test_bit(vector, (unsigned long *)pid->pir);
}

extern void intel_posted_msi_init(void);
#else
static inline bool pi_pending_this_cpu(unsigned int vector) { return false; }

static inline void intel_posted_msi_init(void) {};
#endif /* X86_POSTED_MSI */

#endif /* _X86_POSTED_INTR_H */