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1a89dd91 MZ |
1 | /* |
2 | * Copyright (C) 2012 ARM Ltd. | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
19 | #ifndef __ASM_ARM_KVM_VGIC_H | |
20 | #define __ASM_ARM_KVM_VGIC_H | |
21 | ||
b47ef92a MZ |
22 | #include <linux/kernel.h> |
23 | #include <linux/kvm.h> | |
b47ef92a MZ |
24 | #include <linux/irqreturn.h> |
25 | #include <linux/spinlock.h> | |
26 | #include <linux/types.h> | |
1a89dd91 | 27 | |
5fb66da6 | 28 | #define VGIC_NR_IRQS_LEGACY 256 |
b47ef92a MZ |
29 | #define VGIC_NR_SGIS 16 |
30 | #define VGIC_NR_PPIS 16 | |
31 | #define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS) | |
8f186d52 MZ |
32 | |
33 | #define VGIC_V2_MAX_LRS (1 << 6) | |
b2fb1c0d | 34 | #define VGIC_V3_MAX_LRS 16 |
c3c91836 | 35 | #define VGIC_MAX_IRQS 1024 |
b47ef92a MZ |
36 | |
37 | /* Sanity checks... */ | |
fc675e35 | 38 | #if (KVM_MAX_VCPUS > 8) |
b47ef92a MZ |
39 | #error Invalid number of CPU interfaces |
40 | #endif | |
41 | ||
5fb66da6 | 42 | #if (VGIC_NR_IRQS_LEGACY & 31) |
b47ef92a MZ |
43 | #error "VGIC_NR_IRQS must be a multiple of 32" |
44 | #endif | |
45 | ||
5fb66da6 | 46 | #if (VGIC_NR_IRQS_LEGACY > VGIC_MAX_IRQS) |
b47ef92a MZ |
47 | #error "VGIC_NR_IRQS must be <= 1024" |
48 | #endif | |
49 | ||
50 | /* | |
51 | * The GIC distributor registers describing interrupts have two parts: | |
52 | * - 32 per-CPU interrupts (SGI + PPI) | |
53 | * - a bunch of shared interrupts (SPI) | |
54 | */ | |
55 | struct vgic_bitmap { | |
c1bfb577 MZ |
56 | /* |
57 | * - One UL per VCPU for private interrupts (assumes UL is at | |
58 | * least 32 bits) | |
59 | * - As many UL as necessary for shared interrupts. | |
60 | * | |
61 | * The private interrupts are accessed via the "private" | |
62 | * field, one UL per vcpu (the state for vcpu n is in | |
63 | * private[n]). The shared interrupts are accessed via the | |
64 | * "shared" pointer (IRQn state is at bit n-32 in the bitmap). | |
65 | */ | |
66 | unsigned long *private; | |
67 | unsigned long *shared; | |
b47ef92a MZ |
68 | }; |
69 | ||
70 | struct vgic_bytemap { | |
c1bfb577 MZ |
71 | /* |
72 | * - 8 u32 per VCPU for private interrupts | |
73 | * - As many u32 as necessary for shared interrupts. | |
74 | * | |
75 | * The private interrupts are accessed via the "private" | |
76 | * field, (the state for vcpu n is in private[n*8] to | |
77 | * private[n*8 + 7]). The shared interrupts are accessed via | |
78 | * the "shared" pointer (IRQn state is at byte (n-32)%4 of the | |
79 | * shared[(n-32)/4] word). | |
80 | */ | |
81 | u32 *private; | |
82 | u32 *shared; | |
b47ef92a MZ |
83 | }; |
84 | ||
8d5c6b06 MZ |
85 | struct kvm_vcpu; |
86 | ||
1a9b1305 MZ |
87 | enum vgic_type { |
88 | VGIC_V2, /* Good ol' GICv2 */ | |
b2fb1c0d | 89 | VGIC_V3, /* New fancy GICv3 */ |
1a9b1305 MZ |
90 | }; |
91 | ||
8d5c6b06 MZ |
92 | #define LR_STATE_PENDING (1 << 0) |
93 | #define LR_STATE_ACTIVE (1 << 1) | |
94 | #define LR_STATE_MASK (3 << 0) | |
95 | #define LR_EOI_INT (1 << 2) | |
96 | ||
97 | struct vgic_lr { | |
98 | u16 irq; | |
99 | u8 source; | |
100 | u8 state; | |
101 | }; | |
102 | ||
beee38b9 MZ |
103 | struct vgic_vmcr { |
104 | u32 ctlr; | |
105 | u32 abpr; | |
106 | u32 bpr; | |
107 | u32 pmr; | |
108 | }; | |
109 | ||
8d5c6b06 MZ |
110 | struct vgic_ops { |
111 | struct vgic_lr (*get_lr)(const struct kvm_vcpu *, int); | |
112 | void (*set_lr)(struct kvm_vcpu *, int, struct vgic_lr); | |
69bb2c9f MZ |
113 | void (*sync_lr_elrsr)(struct kvm_vcpu *, int, struct vgic_lr); |
114 | u64 (*get_elrsr)(const struct kvm_vcpu *vcpu); | |
8d6a0313 | 115 | u64 (*get_eisr)(const struct kvm_vcpu *vcpu); |
495dd859 | 116 | u32 (*get_interrupt_status)(const struct kvm_vcpu *vcpu); |
909d9b50 MZ |
117 | void (*enable_underflow)(struct kvm_vcpu *vcpu); |
118 | void (*disable_underflow)(struct kvm_vcpu *vcpu); | |
beee38b9 MZ |
119 | void (*get_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); |
120 | void (*set_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr); | |
da8dafd1 | 121 | void (*enable)(struct kvm_vcpu *vcpu); |
8d5c6b06 MZ |
122 | }; |
123 | ||
ca85f623 | 124 | struct vgic_params { |
1a9b1305 MZ |
125 | /* vgic type */ |
126 | enum vgic_type type; | |
ca85f623 MZ |
127 | /* Physical address of vgic virtual cpu interface */ |
128 | phys_addr_t vcpu_base; | |
129 | /* Number of list registers */ | |
130 | u32 nr_lr; | |
131 | /* Interrupt number */ | |
132 | unsigned int maint_irq; | |
133 | /* Virtual control interface base address */ | |
134 | void __iomem *vctrl_base; | |
135 | }; | |
136 | ||
b26e5fda AP |
137 | struct vgic_vm_ops { |
138 | bool (*handle_mmio)(struct kvm_vcpu *, struct kvm_run *, | |
139 | struct kvm_exit_mmio *); | |
140 | bool (*queue_sgi)(struct kvm_vcpu *, int irq); | |
141 | void (*add_sgi_source)(struct kvm_vcpu *, int irq, int source); | |
142 | int (*init_model)(struct kvm *); | |
143 | int (*map_resources)(struct kvm *, const struct vgic_params *); | |
144 | }; | |
145 | ||
1a89dd91 | 146 | struct vgic_dist { |
b47ef92a MZ |
147 | #ifdef CONFIG_KVM_ARM_VGIC |
148 | spinlock_t lock; | |
f982cf4e | 149 | bool in_kernel; |
01ac5e34 | 150 | bool ready; |
b47ef92a | 151 | |
59892136 AP |
152 | /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */ |
153 | u32 vgic_model; | |
154 | ||
c1bfb577 MZ |
155 | int nr_cpus; |
156 | int nr_irqs; | |
157 | ||
b47ef92a MZ |
158 | /* Virtual control interface mapping */ |
159 | void __iomem *vctrl_base; | |
160 | ||
330690cd CD |
161 | /* Distributor and vcpu interface mapping in the guest */ |
162 | phys_addr_t vgic_dist_base; | |
163 | phys_addr_t vgic_cpu_base; | |
b47ef92a MZ |
164 | |
165 | /* Distributor enabled */ | |
166 | u32 enabled; | |
167 | ||
168 | /* Interrupt enabled (one bit per IRQ) */ | |
169 | struct vgic_bitmap irq_enabled; | |
170 | ||
faa1b46c CD |
171 | /* Level-triggered interrupt external input is asserted */ |
172 | struct vgic_bitmap irq_level; | |
173 | ||
174 | /* | |
175 | * Interrupt state is pending on the distributor | |
176 | */ | |
227844f5 | 177 | struct vgic_bitmap irq_pending; |
b47ef92a | 178 | |
faa1b46c CD |
179 | /* |
180 | * Tracks writes to GICD_ISPENDRn and GICD_ICPENDRn for level-triggered | |
181 | * interrupts. Essentially holds the state of the flip-flop in | |
182 | * Figure 4-10 on page 4-101 in ARM IHI 0048B.b. | |
183 | * Once set, it is only cleared for level-triggered interrupts on | |
184 | * guest ACKs (when we queue it) or writes to GICD_ICPENDRn. | |
185 | */ | |
186 | struct vgic_bitmap irq_soft_pend; | |
187 | ||
dbf20f9d CD |
188 | /* Level-triggered interrupt queued on VCPU interface */ |
189 | struct vgic_bitmap irq_queued; | |
b47ef92a MZ |
190 | |
191 | /* Interrupt priority. Not used yet. */ | |
192 | struct vgic_bytemap irq_priority; | |
193 | ||
194 | /* Level/edge triggered */ | |
195 | struct vgic_bitmap irq_cfg; | |
196 | ||
c1bfb577 MZ |
197 | /* |
198 | * Source CPU per SGI and target CPU: | |
199 | * | |
200 | * Each byte represent a SGI observable on a VCPU, each bit of | |
201 | * this byte indicating if the corresponding VCPU has | |
202 | * generated this interrupt. This is a GICv2 feature only. | |
203 | * | |
204 | * For VCPUn (n < 8), irq_sgi_sources[n*16] to [n*16 + 15] are | |
205 | * the SGIs observable on VCPUn. | |
206 | */ | |
207 | u8 *irq_sgi_sources; | |
b47ef92a | 208 | |
c1bfb577 MZ |
209 | /* |
210 | * Target CPU for each SPI: | |
211 | * | |
212 | * Array of available SPI, each byte indicating the target | |
213 | * VCPU for SPI. IRQn (n >=32) is at irq_spi_cpu[n-32]. | |
214 | */ | |
215 | u8 *irq_spi_cpu; | |
216 | ||
217 | /* | |
218 | * Reverse lookup of irq_spi_cpu for faster compute pending: | |
219 | * | |
220 | * Array of bitmaps, one per VCPU, describing if IRQn is | |
221 | * routed to a particular VCPU. | |
222 | */ | |
223 | struct vgic_bitmap *irq_spi_target; | |
b47ef92a MZ |
224 | |
225 | /* Bitmap indicating which CPU has something pending */ | |
c1bfb577 | 226 | unsigned long *irq_pending_on_cpu; |
b26e5fda AP |
227 | |
228 | struct vgic_vm_ops vm_ops; | |
b47ef92a | 229 | #endif |
1a89dd91 MZ |
230 | }; |
231 | ||
eede821d MZ |
232 | struct vgic_v2_cpu_if { |
233 | u32 vgic_hcr; | |
234 | u32 vgic_vmcr; | |
235 | u32 vgic_misr; /* Saved only */ | |
2df36a5d CD |
236 | u64 vgic_eisr; /* Saved only */ |
237 | u64 vgic_elrsr; /* Saved only */ | |
eede821d | 238 | u32 vgic_apr; |
8f186d52 | 239 | u32 vgic_lr[VGIC_V2_MAX_LRS]; |
eede821d MZ |
240 | }; |
241 | ||
b2fb1c0d MZ |
242 | struct vgic_v3_cpu_if { |
243 | #ifdef CONFIG_ARM_GIC_V3 | |
244 | u32 vgic_hcr; | |
245 | u32 vgic_vmcr; | |
246 | u32 vgic_misr; /* Saved only */ | |
247 | u32 vgic_eisr; /* Saved only */ | |
248 | u32 vgic_elrsr; /* Saved only */ | |
249 | u32 vgic_ap0r[4]; | |
250 | u32 vgic_ap1r[4]; | |
251 | u64 vgic_lr[VGIC_V3_MAX_LRS]; | |
252 | #endif | |
253 | }; | |
254 | ||
1a89dd91 | 255 | struct vgic_cpu { |
9d949dce MZ |
256 | #ifdef CONFIG_KVM_ARM_VGIC |
257 | /* per IRQ to LR mapping */ | |
c1bfb577 | 258 | u8 *vgic_irq_lr_map; |
9d949dce MZ |
259 | |
260 | /* Pending interrupts on this VCPU */ | |
261 | DECLARE_BITMAP( pending_percpu, VGIC_NR_PRIVATE_IRQS); | |
c1bfb577 | 262 | unsigned long *pending_shared; |
9d949dce MZ |
263 | |
264 | /* Bitmap of used/free list registers */ | |
8f186d52 | 265 | DECLARE_BITMAP( lr_used, VGIC_V2_MAX_LRS); |
9d949dce MZ |
266 | |
267 | /* Number of list registers on this CPU */ | |
268 | int nr_lr; | |
269 | ||
270 | /* CPU vif control registers for world switch */ | |
eede821d MZ |
271 | union { |
272 | struct vgic_v2_cpu_if vgic_v2; | |
b2fb1c0d | 273 | struct vgic_v3_cpu_if vgic_v3; |
eede821d | 274 | }; |
9d949dce | 275 | #endif |
1a89dd91 MZ |
276 | }; |
277 | ||
9d949dce MZ |
278 | #define LR_EMPTY 0xff |
279 | ||
495dd859 MZ |
280 | #define INT_STATUS_EOI (1 << 0) |
281 | #define INT_STATUS_UNDERFLOW (1 << 1) | |
282 | ||
1a89dd91 MZ |
283 | struct kvm; |
284 | struct kvm_vcpu; | |
285 | struct kvm_run; | |
286 | struct kvm_exit_mmio; | |
287 | ||
288 | #ifdef CONFIG_KVM_ARM_VGIC | |
ce01e4e8 | 289 | int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write); |
01ac5e34 | 290 | int kvm_vgic_hyp_init(void); |
6d3cfbe2 | 291 | int kvm_vgic_map_resources(struct kvm *kvm); |
59892136 | 292 | int kvm_vgic_create(struct kvm *kvm, u32 type); |
c1bfb577 | 293 | void kvm_vgic_destroy(struct kvm *kvm); |
c1bfb577 | 294 | void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu); |
9d949dce MZ |
295 | void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu); |
296 | void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu); | |
5863c2ce MZ |
297 | int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num, |
298 | bool level); | |
9d949dce | 299 | int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu); |
1a89dd91 MZ |
300 | bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run, |
301 | struct kvm_exit_mmio *mmio); | |
302 | ||
f982cf4e | 303 | #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel)) |
1f57be28 | 304 | #define vgic_initialized(k) (!!((k)->arch.vgic.nr_cpus)) |
c52edf5f | 305 | #define vgic_ready(k) ((k)->arch.vgic.ready) |
9d949dce | 306 | |
8f186d52 MZ |
307 | int vgic_v2_probe(struct device_node *vgic_node, |
308 | const struct vgic_ops **ops, | |
309 | const struct vgic_params **params); | |
b2fb1c0d MZ |
310 | #ifdef CONFIG_ARM_GIC_V3 |
311 | int vgic_v3_probe(struct device_node *vgic_node, | |
312 | const struct vgic_ops **ops, | |
313 | const struct vgic_params **params); | |
314 | #else | |
315 | static inline int vgic_v3_probe(struct device_node *vgic_node, | |
316 | const struct vgic_ops **ops, | |
317 | const struct vgic_params **params) | |
318 | { | |
319 | return -ENODEV; | |
320 | } | |
321 | #endif | |
8f186d52 | 322 | |
1a89dd91 MZ |
323 | #else |
324 | static inline int kvm_vgic_hyp_init(void) | |
325 | { | |
326 | return 0; | |
327 | } | |
328 | ||
330690cd CD |
329 | static inline int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr) |
330 | { | |
331 | return 0; | |
332 | } | |
333 | ||
6cbde825 MZ |
334 | static inline int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write) |
335 | { | |
336 | return -ENXIO; | |
337 | } | |
338 | ||
6d3cfbe2 | 339 | static inline int kvm_vgic_map_resources(struct kvm *kvm) |
1a89dd91 MZ |
340 | { |
341 | return 0; | |
342 | } | |
343 | ||
59892136 | 344 | static inline int kvm_vgic_create(struct kvm *kvm, u32 type) |
1a89dd91 MZ |
345 | { |
346 | return 0; | |
347 | } | |
348 | ||
b5e7a955 AB |
349 | static inline void kvm_vgic_destroy(struct kvm *kvm) |
350 | { | |
351 | } | |
352 | ||
353 | static inline void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu) | |
354 | { | |
355 | } | |
356 | ||
1a89dd91 MZ |
357 | static inline int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu) |
358 | { | |
359 | return 0; | |
360 | } | |
361 | ||
362 | static inline void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) {} | |
363 | static inline void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) {} | |
364 | ||
5863c2ce MZ |
365 | static inline int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, |
366 | unsigned int irq_num, bool level) | |
367 | { | |
368 | return 0; | |
369 | } | |
370 | ||
1a89dd91 MZ |
371 | static inline int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu) |
372 | { | |
373 | return 0; | |
374 | } | |
375 | ||
376 | static inline bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run, | |
377 | struct kvm_exit_mmio *mmio) | |
378 | { | |
379 | return false; | |
380 | } | |
381 | ||
382 | static inline int irqchip_in_kernel(struct kvm *kvm) | |
383 | { | |
384 | return 0; | |
385 | } | |
01ac5e34 | 386 | |
1f57be28 CD |
387 | static inline bool vgic_initialized(struct kvm *kvm) |
388 | { | |
389 | return true; | |
390 | } | |
391 | ||
c52edf5f | 392 | static inline bool vgic_ready(struct kvm *kvm) |
01ac5e34 MZ |
393 | { |
394 | return true; | |
395 | } | |
1a89dd91 MZ |
396 | #endif |
397 | ||
398 | #endif |