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Linux/arch/x86/include/asm/io_apic.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_X86_IO_APIC_H
  3 #define _ASM_X86_IO_APIC_H
  4 
  5 #include <linux/types.h>
  6 #include <asm/mpspec.h>
  7 #include <asm/apicdef.h>
  8 #include <asm/irq_vectors.h>
  9 #include <asm/x86_init.h>
 10 /*
 11  * Intel IO-APIC support for SMP and UP systems.
 12  *
 13  * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
 14  */
 15 
 16 /* I/O Unit Redirection Table */
 17 #define IO_APIC_REDIR_VECTOR_MASK       0x000FF
 18 #define IO_APIC_REDIR_DEST_LOGICAL      0x00800
 19 #define IO_APIC_REDIR_DEST_PHYSICAL     0x00000
 20 #define IO_APIC_REDIR_SEND_PENDING      (1 << 12)
 21 #define IO_APIC_REDIR_REMOTE_IRR        (1 << 14)
 22 #define IO_APIC_REDIR_LEVEL_TRIGGER     (1 << 15)
 23 #define IO_APIC_REDIR_MASKED            (1 << 16)
 24 
 25 /*
 26  * The structure of the IO-APIC:
 27  */
 28 union IO_APIC_reg_00 {
 29         u32     raw;
 30         struct {
 31                 u32     __reserved_2    : 14,
 32                         LTS             :  1,
 33                         delivery_type   :  1,
 34                         __reserved_1    :  8,
 35                         ID              :  8;
 36         } __attribute__ ((packed)) bits;
 37 };
 38 
 39 union IO_APIC_reg_01 {
 40         u32     raw;
 41         struct {
 42                 u32     version         :  8,
 43                         __reserved_2    :  7,
 44                         PRQ             :  1,
 45                         entries         :  8,
 46                         __reserved_1    :  8;
 47         } __attribute__ ((packed)) bits;
 48 };
 49 
 50 union IO_APIC_reg_02 {
 51         u32     raw;
 52         struct {
 53                 u32     __reserved_2    : 24,
 54                         arbitration     :  4,
 55                         __reserved_1    :  4;
 56         } __attribute__ ((packed)) bits;
 57 };
 58 
 59 union IO_APIC_reg_03 {
 60         u32     raw;
 61         struct {
 62                 u32     boot_DT         :  1,
 63                         __reserved_1    : 31;
 64         } __attribute__ ((packed)) bits;
 65 };
 66 
 67 struct IO_APIC_route_entry {
 68         __u32   vector          :  8,
 69                 delivery_mode   :  3,   /* 000: FIXED
 70                                          * 001: lowest prio
 71                                          * 111: ExtINT
 72                                          */
 73                 dest_mode       :  1,   /* 0: physical, 1: logical */
 74                 delivery_status :  1,
 75                 polarity        :  1,
 76                 irr             :  1,
 77                 trigger         :  1,   /* 0: edge, 1: level */
 78                 mask            :  1,   /* 0: enabled, 1: disabled */
 79                 __reserved_2    : 15;
 80 
 81         __u32   __reserved_3    : 24,
 82                 dest            :  8;
 83 } __attribute__ ((packed));
 84 
 85 struct IR_IO_APIC_route_entry {
 86         __u64   vector          : 8,
 87                 zero            : 3,
 88                 index2          : 1,
 89                 delivery_status : 1,
 90                 polarity        : 1,
 91                 irr             : 1,
 92                 trigger         : 1,
 93                 mask            : 1,
 94                 reserved        : 31,
 95                 format          : 1,
 96                 index           : 15;
 97 } __attribute__ ((packed));
 98 
 99 struct irq_alloc_info;
100 struct ioapic_domain_cfg;
101 
102 #define IOAPIC_AUTO                     -1
103 #define IOAPIC_EDGE                     0
104 #define IOAPIC_LEVEL                    1
105 
106 #define IOAPIC_MASKED                   1
107 #define IOAPIC_UNMASKED                 0
108 
109 #define IOAPIC_POL_HIGH                 0
110 #define IOAPIC_POL_LOW                  1
111 
112 #define IOAPIC_DEST_MODE_PHYSICAL       0
113 #define IOAPIC_DEST_MODE_LOGICAL        1
114 
115 #define IOAPIC_MAP_ALLOC                0x1
116 #define IOAPIC_MAP_CHECK                0x2
117 
118 #ifdef CONFIG_X86_IO_APIC
119 
120 /*
121  * # of IO-APICs and # of IRQ routing registers
122  */
123 extern int nr_ioapics;
124 
125 extern int mpc_ioapic_id(int ioapic);
126 extern unsigned int mpc_ioapic_addr(int ioapic);
127 
128 /* # of MP IRQ source entries */
129 extern int mp_irq_entries;
130 
131 /* MP IRQ source entries */
132 extern struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
133 
134 /* 1 if "noapic" boot option passed */
135 extern int skip_ioapic_setup;
136 
137 /* 1 if "noapic" boot option passed */
138 extern int noioapicquirk;
139 
140 /* -1 if "noapic" boot option passed */
141 extern int noioapicreroute;
142 
143 extern u32 gsi_top;
144 
145 extern unsigned long io_apic_irqs;
146 
147 #define IO_APIC_IRQ(x) (((x) >= NR_IRQS_LEGACY) || ((1 << (x)) & io_apic_irqs))
148 
149 /*
150  * If we use the IO-APIC for IRQ routing, disable automatic
151  * assignment of PCI IRQ's.
152  */
153 #define io_apic_assign_pci_irqs \
154         (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
155 
156 struct irq_cfg;
157 extern void ioapic_insert_resources(void);
158 extern int arch_early_ioapic_init(void);
159 
160 extern int save_ioapic_entries(void);
161 extern void mask_ioapic_entries(void);
162 extern int restore_ioapic_entries(void);
163 
164 extern void setup_ioapic_ids_from_mpc(void);
165 extern void setup_ioapic_ids_from_mpc_nocheck(void);
166 
167 extern int mp_find_ioapic(u32 gsi);
168 extern int mp_find_ioapic_pin(int ioapic, u32 gsi);
169 extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
170                              struct irq_alloc_info *info);
171 extern void mp_unmap_irq(int irq);
172 extern int mp_register_ioapic(int id, u32 address, u32 gsi_base,
173                               struct ioapic_domain_cfg *cfg);
174 extern int mp_unregister_ioapic(u32 gsi_base);
175 extern int mp_ioapic_registered(u32 gsi_base);
176 
177 extern void ioapic_set_alloc_attr(struct irq_alloc_info *info,
178                                   int node, int trigger, int polarity);
179 
180 extern void mp_save_irq(struct mpc_intsrc *m);
181 
182 extern void disable_ioapic_support(void);
183 
184 extern void __init io_apic_init_mappings(void);
185 extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
186 extern void native_restore_boot_irq_mode(void);
187 
188 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
189 {
190         return x86_apic_ops.io_apic_read(apic, reg);
191 }
192 
193 extern void setup_IO_APIC(void);
194 extern void enable_IO_APIC(void);
195 extern void clear_IO_APIC(void);
196 extern void restore_boot_irq_mode(void);
197 extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
198 extern void print_IO_APICs(void);
199 #else  /* !CONFIG_X86_IO_APIC */
200 
201 #define IO_APIC_IRQ(x)          0
202 #define io_apic_assign_pci_irqs 0
203 #define setup_ioapic_ids_from_mpc x86_init_noop
204 static inline void ioapic_insert_resources(void) { }
205 static inline int arch_early_ioapic_init(void) { return 0; }
206 static inline void print_IO_APICs(void) {}
207 #define gsi_top (NR_IRQS_LEGACY)
208 static inline int mp_find_ioapic(u32 gsi) { return 0; }
209 static inline int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
210                                     struct irq_alloc_info *info)
211 {
212         return gsi;
213 }
214 
215 static inline void mp_unmap_irq(int irq) { }
216 
217 static inline int save_ioapic_entries(void)
218 {
219         return -ENOMEM;
220 }
221 
222 static inline void mask_ioapic_entries(void) { }
223 static inline int restore_ioapic_entries(void)
224 {
225         return -ENOMEM;
226 }
227 
228 static inline void mp_save_irq(struct mpc_intsrc *m) { }
229 static inline void disable_ioapic_support(void) { }
230 static inline void io_apic_init_mappings(void) { }
231 #define native_io_apic_read             NULL
232 #define native_restore_boot_irq_mode    NULL
233 
234 static inline void setup_IO_APIC(void) { }
235 static inline void enable_IO_APIC(void) { }
236 static inline void restore_boot_irq_mode(void) { }
237 
238 #endif
239 
240 #endif /* _ASM_X86_IO_APIC_H */
241 

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