1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Copyright 2016,2017 IBM Corporation.
4 */
5#ifndef _ASM_POWERPC_XIVE_H
6#define _ASM_POWERPC_XIVE_H
7
8#include <asm/opal-api.h>
9
10#define XIVE_INVALID_VP	0xffffffff
11
12#ifdef CONFIG_PPC_XIVE
13
14/*
15 * Thread Interrupt Management Area (TIMA)
16 *
17 * This is a global MMIO region divided in 4 pages of varying access
18 * permissions, providing access to per-cpu interrupt management
19 * functions. It always identifies the CPU doing the access based
20 * on the PowerBus initiator ID, thus we always access via the
21 * same offset regardless of where the code is executing
22 */
23extern void __iomem *xive_tima;
24extern unsigned long xive_tima_os;
25
26/*
27 * Offset in the TM area of our current execution level (provided by
28 * the backend)
29 */
30extern u32 xive_tima_offset;
31
32/*
33 * Per-irq data (irq_get_handler_data for normal IRQs), IPIs
34 * have it stored in the xive_cpu structure. We also cache
35 * for normal interrupts the current target CPU.
36 *
37 * This structure is setup by the backend for each interrupt.
38 */
39struct xive_irq_data {
40	u64 flags;
41	u64 eoi_page;
42	void __iomem *eoi_mmio;
43	u64 trig_page;
44	void __iomem *trig_mmio;
45	u32 esb_shift;
46	int src_chip;
47	u32 hw_irq;
48
49	/* Setup/used by frontend */
50	int target;
51	/*
52	 * saved_p means that there is a queue entry for this interrupt
53	 * in some CPU's queue (not including guest vcpu queues), even
54	 * if P is not set in the source ESB.
55	 * stale_p means that there is no queue entry for this interrupt
56	 * in some CPU's queue, even if P is set in the source ESB.
57	 */
58	bool saved_p;
59	bool stale_p;
60};
61#define XIVE_IRQ_FLAG_STORE_EOI	0x01
62#define XIVE_IRQ_FLAG_LSI	0x02
63#define XIVE_IRQ_FLAG_SHIFT_BUG	0x04
64#define XIVE_IRQ_FLAG_MASK_FW	0x08
65#define XIVE_IRQ_FLAG_EOI_FW	0x10
66#define XIVE_IRQ_FLAG_H_INT_ESB	0x20
67
68/* Special flag set by KVM for excalation interrupts */
69#define XIVE_IRQ_NO_EOI		0x80
70
71#define XIVE_INVALID_CHIP_ID	-1
72
73/* A queue tracking structure in a CPU */
74struct xive_q {
75	__be32 			*qpage;
76	u32			msk;
77	u32			idx;
78	u32			toggle;
79	u64			eoi_phys;
80	u32			esc_irq;
81	atomic_t		count;
82	atomic_t		pending_count;
83	u64			guest_qaddr;
84	u32			guest_qshift;
85};
86
87/* Global enable flags for the XIVE support */
88extern bool __xive_enabled;
89
90static inline bool xive_enabled(void) { return __xive_enabled; }
91
92bool xive_spapr_init(void);
93bool xive_native_init(void);
94void xive_smp_probe(void);
95int  xive_smp_prepare_cpu(unsigned int cpu);
96void xive_smp_setup_cpu(void);
97void xive_smp_disable_cpu(void);
98void xive_teardown_cpu(void);
99void xive_shutdown(void);
100void xive_flush_interrupt(void);
101
102/* xmon hook */
103void xmon_xive_do_dump(int cpu);
104int xmon_xive_get_irq_config(u32 hw_irq, struct irq_data *d);
105
106/* APIs used by KVM */
107u32 xive_native_default_eq_shift(void);
108u32 xive_native_alloc_vp_block(u32 max_vcpus);
109void xive_native_free_vp_block(u32 vp_base);
110int xive_native_populate_irq_data(u32 hw_irq,
111				  struct xive_irq_data *data);
112void xive_cleanup_irq_data(struct xive_irq_data *xd);
113void xive_native_free_irq(u32 irq);
114int xive_native_configure_irq(u32 hw_irq, u32 target, u8 prio, u32 sw_irq);
115
116int xive_native_configure_queue(u32 vp_id, struct xive_q *q, u8 prio,
117				__be32 *qpage, u32 order, bool can_escalate);
118void xive_native_disable_queue(u32 vp_id, struct xive_q *q, u8 prio);
119
120void xive_native_sync_source(u32 hw_irq);
121void xive_native_sync_queue(u32 hw_irq);
122bool is_xive_irq(struct irq_chip *chip);
123int xive_native_enable_vp(u32 vp_id, bool single_escalation);
124int xive_native_disable_vp(u32 vp_id);
125int xive_native_get_vp_info(u32 vp_id, u32 *out_cam_id, u32 *out_chip_id);
126bool xive_native_has_single_escalation(void);
127
128int xive_native_get_queue_info(u32 vp_id, uint32_t prio,
129			       u64 *out_qpage,
130			       u64 *out_qsize,
131			       u64 *out_qeoi_page,
132			       u32 *out_escalate_irq,
133			       u64 *out_qflags);
134
135int xive_native_get_queue_state(u32 vp_id, uint32_t prio, u32 *qtoggle,
136				u32 *qindex);
137int xive_native_set_queue_state(u32 vp_id, uint32_t prio, u32 qtoggle,
138				u32 qindex);
139int xive_native_get_vp_state(u32 vp_id, u64 *out_state);
140bool xive_native_has_queue_state_support(void);
141extern u32 xive_native_alloc_irq_on_chip(u32 chip_id);
142
143static inline u32 xive_native_alloc_irq(void)
144{
145	return xive_native_alloc_irq_on_chip(OPAL_XIVE_ANY_CHIP);
146}
147
148#else
149
150static inline bool xive_enabled(void) { return false; }
151
152static inline bool xive_spapr_init(void) { return false; }
153static inline bool xive_native_init(void) { return false; }
154static inline void xive_smp_probe(void) { }
155static inline int  xive_smp_prepare_cpu(unsigned int cpu) { return -EINVAL; }
156static inline void xive_smp_setup_cpu(void) { }
157static inline void xive_smp_disable_cpu(void) { }
158static inline void xive_shutdown(void) { }
159static inline void xive_flush_interrupt(void) { }
160
161static inline u32 xive_native_alloc_vp_block(u32 max_vcpus) { return XIVE_INVALID_VP; }
162static inline void xive_native_free_vp_block(u32 vp_base) { }
163
164#endif
165
166#endif /* _ASM_POWERPC_XIVE_H */
167