1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright 2017 Benjamin Herrenschmidt, IBM Corporation
4 */
5
6 #ifndef _KVM_PPC_BOOK3S_XIVE_H
7 #define _KVM_PPC_BOOK3S_XIVE_H
8
9 #ifdef CONFIG_KVM_XICS
10 #include "book3s_xics.h"
11
12 /*
13 * The XIVE Interrupt source numbers are within the range 0 to
14 * KVMPPC_XICS_NR_IRQS.
15 */
16 #define KVMPPC_XIVE_FIRST_IRQ 0
17 #define KVMPPC_XIVE_NR_IRQS KVMPPC_XICS_NR_IRQS
18
19 /*
20 * State for one guest irq source.
21 *
22 * For each guest source we allocate a HW interrupt in the XIVE
23 * which we use for all SW triggers. It will be unused for
24 * pass-through but it's easier to keep around as the same
25 * guest interrupt can alternatively be emulated or pass-through
26 * if a physical device is hot unplugged and replaced with an
27 * emulated one.
28 *
29 * This state structure is very similar to the XICS one with
30 * additional XIVE specific tracking.
31 */
32 struct kvmppc_xive_irq_state {
33 bool valid; /* Interrupt entry is valid */
34
35 u32 number; /* Guest IRQ number */
36 u32 ipi_number; /* XIVE IPI HW number */
37 struct xive_irq_data ipi_data; /* XIVE IPI associated data */
38 u32 pt_number; /* XIVE Pass-through number if any */
39 struct xive_irq_data *pt_data; /* XIVE Pass-through associated data */
40
41 /* Targetting as set by guest */
42 u8 guest_priority; /* Guest set priority */
43 u8 saved_priority; /* Saved priority when masking */
44
45 /* Actual targetting */
46 u32 act_server; /* Actual server */
47 u8 act_priority; /* Actual priority */
48
49 /* Various state bits */
50 bool in_eoi; /* Synchronize with H_EOI */
51 bool old_p; /* P bit state when masking */
52 bool old_q; /* Q bit state when masking */
53 bool lsi; /* level-sensitive interrupt */
54 bool asserted; /* Only for emulated LSI: current state */
55
56 /* Saved for migration state */
57 bool in_queue;
58 bool saved_p;
59 bool saved_q;
60 u8 saved_scan_prio;
61
62 /* Xive native */
63 u32 eisn; /* Guest Effective IRQ number */
64 };
65
66 /* Select the "right" interrupt (IPI vs. passthrough) */
kvmppc_xive_select_irq(struct kvmppc_xive_irq_state * state,u32 * out_hw_irq,struct xive_irq_data ** out_xd)67 static inline void kvmppc_xive_select_irq(struct kvmppc_xive_irq_state *state,
68 u32 *out_hw_irq,
69 struct xive_irq_data **out_xd)
70 {
71 if (state->pt_number) {
72 if (out_hw_irq)
73 *out_hw_irq = state->pt_number;
74 if (out_xd)
75 *out_xd = state->pt_data;
76 } else {
77 if (out_hw_irq)
78 *out_hw_irq = state->ipi_number;
79 if (out_xd)
80 *out_xd = &state->ipi_data;
81 }
82 }
83
84 /*
85 * This corresponds to an "ICS" in XICS terminology, we use it
86 * as a mean to break up source information into multiple structures.
87 */
88 struct kvmppc_xive_src_block {
89 arch_spinlock_t lock;
90 u16 id;
91 struct kvmppc_xive_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
92 };
93
94 struct kvmppc_xive;
95
96 struct kvmppc_xive_ops {
97 int (*reset_mapped)(struct kvm *kvm, unsigned long guest_irq);
98 };
99
100 struct kvmppc_xive {
101 struct kvm *kvm;
102 struct kvm_device *dev;
103 struct dentry *dentry;
104
105 /* VP block associated with the VM */
106 u32 vp_base;
107
108 /* Blocks of sources */
109 struct kvmppc_xive_src_block *src_blocks[KVMPPC_XICS_MAX_ICS_ID + 1];
110 u32 max_sbid;
111
112 /*
113 * For state save, we lazily scan the queues on the first interrupt
114 * being migrated. We don't have a clean way to reset that flags
115 * so we keep track of the number of valid sources and how many of
116 * them were migrated so we can reset when all of them have been
117 * processed.
118 */
119 u32 src_count;
120 u32 saved_src_count;
121
122 /*
123 * Some irqs are delayed on restore until the source is created,
124 * keep track here of how many of them
125 */
126 u32 delayed_irqs;
127
128 /* Which queues (priorities) are in use by the guest */
129 u8 qmap;
130
131 /* Queue orders */
132 u32 q_order;
133 u32 q_page_order;
134
135 /* Flags */
136 u8 single_escalation;
137
138 struct kvmppc_xive_ops *ops;
139 struct address_space *mapping;
140 struct mutex mapping_lock;
141 struct mutex lock;
142 };
143
144 #define KVMPPC_XIVE_Q_COUNT 8
145
146 struct kvmppc_xive_vcpu {
147 struct kvmppc_xive *xive;
148 struct kvm_vcpu *vcpu;
149 bool valid;
150
151 /* Server number. This is the HW CPU ID from a guest perspective */
152 u32 server_num;
153
154 /*
155 * HW VP corresponding to this VCPU. This is the base of the VP
156 * block plus the server number.
157 */
158 u32 vp_id;
159 u32 vp_chip_id;
160 u32 vp_cam;
161
162 /* IPI used for sending ... IPIs */
163 u32 vp_ipi;
164 struct xive_irq_data vp_ipi_data;
165
166 /* Local emulation state */
167 uint8_t cppr; /* guest CPPR */
168 uint8_t hw_cppr;/* Hardware CPPR */
169 uint8_t mfrr;
170 uint8_t pending;
171
172 /* Each VP has 8 queues though we only provision some */
173 struct xive_q queues[KVMPPC_XIVE_Q_COUNT];
174 u32 esc_virq[KVMPPC_XIVE_Q_COUNT];
175 char *esc_virq_names[KVMPPC_XIVE_Q_COUNT];
176
177 /* Stash a delayed irq on restore from migration (see set_icp) */
178 u32 delayed_irq;
179
180 /* Stats */
181 u64 stat_rm_h_xirr;
182 u64 stat_rm_h_ipoll;
183 u64 stat_rm_h_cppr;
184 u64 stat_rm_h_eoi;
185 u64 stat_rm_h_ipi;
186 u64 stat_vm_h_xirr;
187 u64 stat_vm_h_ipoll;
188 u64 stat_vm_h_cppr;
189 u64 stat_vm_h_eoi;
190 u64 stat_vm_h_ipi;
191 };
192
kvmppc_xive_find_server(struct kvm * kvm,u32 nr)193 static inline struct kvm_vcpu *kvmppc_xive_find_server(struct kvm *kvm, u32 nr)
194 {
195 struct kvm_vcpu *vcpu = NULL;
196 int i;
197
198 kvm_for_each_vcpu(i, vcpu, kvm) {
199 if (vcpu->arch.xive_vcpu && nr == vcpu->arch.xive_vcpu->server_num)
200 return vcpu;
201 }
202 return NULL;
203 }
204
kvmppc_xive_find_source(struct kvmppc_xive * xive,u32 irq,u16 * source)205 static inline struct kvmppc_xive_src_block *kvmppc_xive_find_source(struct kvmppc_xive *xive,
206 u32 irq, u16 *source)
207 {
208 u32 bid = irq >> KVMPPC_XICS_ICS_SHIFT;
209 u16 src = irq & KVMPPC_XICS_SRC_MASK;
210
211 if (source)
212 *source = src;
213 if (bid > KVMPPC_XICS_MAX_ICS_ID)
214 return NULL;
215 return xive->src_blocks[bid];
216 }
217
kvmppc_xive_vp(struct kvmppc_xive * xive,u32 server)218 static inline u32 kvmppc_xive_vp(struct kvmppc_xive *xive, u32 server)
219 {
220 return xive->vp_base + kvmppc_pack_vcpu_id(xive->kvm, server);
221 }
222
kvmppc_xive_vp_in_use(struct kvm * kvm,u32 vp_id)223 static inline bool kvmppc_xive_vp_in_use(struct kvm *kvm, u32 vp_id)
224 {
225 struct kvm_vcpu *vcpu = NULL;
226 int i;
227
228 kvm_for_each_vcpu(i, vcpu, kvm) {
229 if (vcpu->arch.xive_vcpu && vp_id == vcpu->arch.xive_vcpu->vp_id)
230 return true;
231 }
232 return false;
233 }
234
235 /*
236 * Mapping between guest priorities and host priorities
237 * is as follow.
238 *
239 * Guest request for 0...6 are honored. Guest request for anything
240 * higher results in a priority of 6 being applied.
241 *
242 * Similar mapping is done for CPPR values
243 */
xive_prio_from_guest(u8 prio)244 static inline u8 xive_prio_from_guest(u8 prio)
245 {
246 if (prio == 0xff || prio < 6)
247 return prio;
248 return 6;
249 }
250
xive_prio_to_guest(u8 prio)251 static inline u8 xive_prio_to_guest(u8 prio)
252 {
253 return prio;
254 }
255
__xive_read_eq(__be32 * qpage,u32 msk,u32 * idx,u32 * toggle)256 static inline u32 __xive_read_eq(__be32 *qpage, u32 msk, u32 *idx, u32 *toggle)
257 {
258 u32 cur;
259
260 if (!qpage)
261 return 0;
262 cur = be32_to_cpup(qpage + *idx);
263 if ((cur >> 31) == *toggle)
264 return 0;
265 *idx = (*idx + 1) & msk;
266 if (*idx == 0)
267 (*toggle) ^= 1;
268 return cur & 0x7fffffff;
269 }
270
271 extern unsigned long xive_rm_h_xirr(struct kvm_vcpu *vcpu);
272 extern unsigned long xive_rm_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server);
273 extern int xive_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
274 unsigned long mfrr);
275 extern int xive_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr);
276 extern int xive_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr);
277
278 extern unsigned long (*__xive_vm_h_xirr)(struct kvm_vcpu *vcpu);
279 extern unsigned long (*__xive_vm_h_ipoll)(struct kvm_vcpu *vcpu, unsigned long server);
280 extern int (*__xive_vm_h_ipi)(struct kvm_vcpu *vcpu, unsigned long server,
281 unsigned long mfrr);
282 extern int (*__xive_vm_h_cppr)(struct kvm_vcpu *vcpu, unsigned long cppr);
283 extern int (*__xive_vm_h_eoi)(struct kvm_vcpu *vcpu, unsigned long xirr);
284
285 /*
286 * Common Xive routines for XICS-over-XIVE and XIVE native
287 */
288 void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu);
289 int kvmppc_xive_debug_show_queues(struct seq_file *m, struct kvm_vcpu *vcpu);
290 struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
291 struct kvmppc_xive *xive, int irq);
292 void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb);
293 int kvmppc_xive_select_target(struct kvm *kvm, u32 *server, u8 prio);
294 int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio,
295 bool single_escalation);
296 struct kvmppc_xive *kvmppc_xive_get_device(struct kvm *kvm, u32 type);
297 void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu,
298 struct kvmppc_xive_vcpu *xc, int irq);
299
300 #endif /* CONFIG_KVM_XICS */
301 #endif /* _KVM_PPC_BOOK3S_XICS_H */
302
