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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | /* * Copyright 2016,2017 IBM Corporation. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _ASM_POWERPC_XIVE_H #define _ASM_POWERPC_XIVE_H #define XIVE_INVALID_VP 0xffffffff #ifdef CONFIG_PPC_XIVE /* * Thread Interrupt Management Area (TIMA) * * This is a global MMIO region divided in 4 pages of varying access * permissions, providing access to per-cpu interrupt management * functions. It always identifies the CPU doing the access based * on the PowerBus initiator ID, thus we always access via the * same offset regardless of where the code is executing */ extern void __iomem *xive_tima; /* * Offset in the TM area of our current execution level (provided by * the backend) */ extern u32 xive_tima_offset; /* * Per-irq data (irq_get_handler_data for normal IRQs), IPIs * have it stored in the xive_cpu structure. We also cache * for normal interrupts the current target CPU. * * This structure is setup by the backend for each interrupt. */ struct xive_irq_data { u64 flags; u64 eoi_page; void __iomem *eoi_mmio; u64 trig_page; void __iomem *trig_mmio; u32 esb_shift; int src_chip; u32 hw_irq; /* Setup/used by frontend */ int target; bool saved_p; }; #define XIVE_IRQ_FLAG_STORE_EOI 0x01 #define XIVE_IRQ_FLAG_LSI 0x02 #define XIVE_IRQ_FLAG_SHIFT_BUG 0x04 #define XIVE_IRQ_FLAG_MASK_FW 0x08 #define XIVE_IRQ_FLAG_EOI_FW 0x10 #define XIVE_IRQ_FLAG_H_INT_ESB 0x20 #define XIVE_INVALID_CHIP_ID -1 /* A queue tracking structure in a CPU */ struct xive_q { __be32 *qpage; u32 msk; u32 idx; u32 toggle; u64 eoi_phys; u32 esc_irq; atomic_t count; atomic_t pending_count; }; /* * "magic" Event State Buffer (ESB) MMIO offsets. * * Each interrupt source has a 2-bit state machine called ESB * which can be controlled by MMIO. It's made of 2 bits, P and * Q. P indicates that an interrupt is pending (has been sent * to a queue and is waiting for an EOI). Q indicates that the * interrupt has been triggered while pending. * * This acts as a coalescing mechanism in order to guarantee * that a given interrupt only occurs at most once in a queue. * * When doing an EOI, the Q bit will indicate if the interrupt * needs to be re-triggered. * * The following offsets into the ESB MMIO allow to read or * manipulate the PQ bits. They must be used with an 8-bytes * load instruction. They all return the previous state of the * interrupt (atomically). * * Additionally, some ESB pages support doing an EOI via a * store at 0 and some ESBs support doing a trigger via a * separate trigger page. */ #define XIVE_ESB_STORE_EOI 0x400 /* Store */ #define XIVE_ESB_LOAD_EOI 0x000 /* Load */ #define XIVE_ESB_GET 0x800 /* Load */ #define XIVE_ESB_SET_PQ_00 0xc00 /* Load */ #define XIVE_ESB_SET_PQ_01 0xd00 /* Load */ #define XIVE_ESB_SET_PQ_10 0xe00 /* Load */ #define XIVE_ESB_SET_PQ_11 0xf00 /* Load */ #define XIVE_ESB_VAL_P 0x2 #define XIVE_ESB_VAL_Q 0x1 /* Global enable flags for the XIVE support */ extern bool __xive_enabled; static inline bool xive_enabled(void) { return __xive_enabled; } extern bool xive_spapr_init(void); extern bool xive_native_init(void); extern void xive_smp_probe(void); extern int xive_smp_prepare_cpu(unsigned int cpu); extern void xive_smp_setup_cpu(void); extern void xive_smp_disable_cpu(void); extern void xive_teardown_cpu(void); extern void xive_kexec_teardown_cpu(int secondary); extern void xive_shutdown(void); extern void xive_flush_interrupt(void); /* xmon hook */ extern void xmon_xive_do_dump(int cpu); /* APIs used by KVM */ extern u32 xive_native_default_eq_shift(void); extern u32 xive_native_alloc_vp_block(u32 max_vcpus); extern void xive_native_free_vp_block(u32 vp_base); extern int xive_native_populate_irq_data(u32 hw_irq, struct xive_irq_data *data); extern void xive_cleanup_irq_data(struct xive_irq_data *xd); extern u32 xive_native_alloc_irq(void); extern void xive_native_free_irq(u32 irq); extern int xive_native_configure_irq(u32 hw_irq, u32 target, u8 prio, u32 sw_irq); extern int xive_native_configure_queue(u32 vp_id, struct xive_q *q, u8 prio, __be32 *qpage, u32 order, bool can_escalate); extern void xive_native_disable_queue(u32 vp_id, struct xive_q *q, u8 prio); extern void xive_native_sync_source(u32 hw_irq); extern bool is_xive_irq(struct irq_chip *chip); extern int xive_native_enable_vp(u32 vp_id); extern int xive_native_disable_vp(u32 vp_id); extern int xive_native_get_vp_info(u32 vp_id, u32 *out_cam_id, u32 *out_chip_id); #else static inline bool xive_enabled(void) { return false; } static inline bool xive_spapr_init(void) { return false; } static inline bool xive_native_init(void) { return false; } static inline void xive_smp_probe(void) { } extern inline int xive_smp_prepare_cpu(unsigned int cpu) { return -EINVAL; } static inline void xive_smp_setup_cpu(void) { } static inline void xive_smp_disable_cpu(void) { } static inline void xive_kexec_teardown_cpu(int secondary) { } static inline void xive_shutdown(void) { } static inline void xive_flush_interrupt(void) { } static inline u32 xive_native_alloc_vp_block(u32 max_vcpus) { return XIVE_INVALID_VP; } static inline void xive_native_free_vp_block(u32 vp_base) { } #endif #endif /* _ASM_POWERPC_XIVE_H */ |