2 * Copyright (C) 2012 ARM Ltd.
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
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.
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.
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
19 #ifndef __ASM_ARM_KVM_VGIC_H
20 #define __ASM_ARM_KVM_VGIC_H
22 #include <linux/kernel.h>
23 #include <linux/kvm.h>
24 #include <linux/irqreturn.h>
25 #include <linux/spinlock.h>
26 #include <linux/types.h>
27 #include <kvm/iodev.h>
29 #define VGIC_NR_IRQS_LEGACY 256
30 #define VGIC_NR_SGIS 16
31 #define VGIC_NR_PPIS 16
32 #define VGIC_NR_PRIVATE_IRQS (VGIC_NR_SGIS + VGIC_NR_PPIS)
34 #define VGIC_V2_MAX_LRS (1 << 6)
35 #define VGIC_V3_MAX_LRS 16
36 #define VGIC_MAX_IRQS 1024
37 #define VGIC_V2_MAX_CPUS 8
38 #define VGIC_V3_MAX_CPUS 255
40 #if (VGIC_NR_IRQS_LEGACY & 31)
41 #error "VGIC_NR_IRQS must be a multiple of 32"
44 #if (VGIC_NR_IRQS_LEGACY > VGIC_MAX_IRQS)
45 #error "VGIC_NR_IRQS must be <= 1024"
49 * The GIC distributor registers describing interrupts have two parts:
50 * - 32 per-CPU interrupts (SGI + PPI)
51 * - a bunch of shared interrupts (SPI)
55 * - One UL per VCPU for private interrupts (assumes UL is at
57 * - As many UL as necessary for shared interrupts.
59 * The private interrupts are accessed via the "private"
60 * field, one UL per vcpu (the state for vcpu n is in
61 * private[n]). The shared interrupts are accessed via the
62 * "shared" pointer (IRQn state is at bit n-32 in the bitmap).
64 unsigned long *private;
65 unsigned long *shared;
70 * - 8 u32 per VCPU for private interrupts
71 * - As many u32 as necessary for shared interrupts.
73 * The private interrupts are accessed via the "private"
74 * field, (the state for vcpu n is in private[n*8] to
75 * private[n*8 + 7]). The shared interrupts are accessed via
76 * the "shared" pointer (IRQn state is at byte (n-32)%4 of the
77 * shared[(n-32)/4] word).
86 VGIC_V2, /* Good ol' GICv2 */
87 VGIC_V3, /* New fancy GICv3 */
90 #define LR_STATE_PENDING (1 << 0)
91 #define LR_STATE_ACTIVE (1 << 1)
92 #define LR_STATE_MASK (3 << 0)
93 #define LR_EOI_INT (1 << 2)
94 #define LR_HW (1 << 3)
113 struct vgic_lr (*get_lr)(const struct kvm_vcpu *, int);
114 void (*set_lr)(struct kvm_vcpu *, int, struct vgic_lr);
115 u64 (*get_elrsr)(const struct kvm_vcpu *vcpu);
116 u64 (*get_eisr)(const struct kvm_vcpu *vcpu);
117 void (*clear_eisr)(struct kvm_vcpu *vcpu);
118 u32 (*get_interrupt_status)(const struct kvm_vcpu *vcpu);
119 void (*enable_underflow)(struct kvm_vcpu *vcpu);
120 void (*disable_underflow)(struct kvm_vcpu *vcpu);
121 void (*get_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
122 void (*set_vmcr)(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
123 void (*enable)(struct kvm_vcpu *vcpu);
129 /* Physical address of vgic virtual cpu interface */
130 phys_addr_t vcpu_base;
131 /* Number of list registers */
133 /* Interrupt number */
134 unsigned int maint_irq;
135 /* Virtual control interface base address */
136 void __iomem *vctrl_base;
138 /* Only needed for the legacy KVM_CREATE_IRQCHIP */
139 bool can_emulate_gicv2;
143 bool (*queue_sgi)(struct kvm_vcpu *, int irq);
144 void (*add_sgi_source)(struct kvm_vcpu *, int irq, int source);
145 int (*init_model)(struct kvm *);
146 int (*map_resources)(struct kvm *, const struct vgic_params *);
149 struct vgic_io_device {
152 const struct vgic_io_range *reg_ranges;
153 struct kvm_vcpu *redist_vcpu;
154 struct kvm_io_device dev;
157 struct irq_phys_map {
163 struct irq_phys_map_entry {
164 struct list_head entry;
166 struct irq_phys_map map;
174 /* vGIC model the kernel emulates for the guest (GICv2 or GICv3) */
180 /* Virtual control interface mapping */
181 void __iomem *vctrl_base;
183 /* Distributor and vcpu interface mapping in the guest */
184 phys_addr_t vgic_dist_base;
185 /* GICv2 and GICv3 use different mapped register blocks */
187 phys_addr_t vgic_cpu_base;
188 phys_addr_t vgic_redist_base;
191 /* Distributor enabled */
194 /* Interrupt enabled (one bit per IRQ) */
195 struct vgic_bitmap irq_enabled;
197 /* Level-triggered interrupt external input is asserted */
198 struct vgic_bitmap irq_level;
201 * Interrupt state is pending on the distributor
203 struct vgic_bitmap irq_pending;
206 * Tracks writes to GICD_ISPENDRn and GICD_ICPENDRn for level-triggered
207 * interrupts. Essentially holds the state of the flip-flop in
208 * Figure 4-10 on page 4-101 in ARM IHI 0048B.b.
209 * Once set, it is only cleared for level-triggered interrupts on
210 * guest ACKs (when we queue it) or writes to GICD_ICPENDRn.
212 struct vgic_bitmap irq_soft_pend;
214 /* Level-triggered interrupt queued on VCPU interface */
215 struct vgic_bitmap irq_queued;
217 /* Interrupt was active when unqueue from VCPU interface */
218 struct vgic_bitmap irq_active;
220 /* Interrupt priority. Not used yet. */
221 struct vgic_bytemap irq_priority;
223 /* Level/edge triggered */
224 struct vgic_bitmap irq_cfg;
227 * Source CPU per SGI and target CPU:
229 * Each byte represent a SGI observable on a VCPU, each bit of
230 * this byte indicating if the corresponding VCPU has
231 * generated this interrupt. This is a GICv2 feature only.
233 * For VCPUn (n < 8), irq_sgi_sources[n*16] to [n*16 + 15] are
234 * the SGIs observable on VCPUn.
239 * Target CPU for each SPI:
241 * Array of available SPI, each byte indicating the target
242 * VCPU for SPI. IRQn (n >=32) is at irq_spi_cpu[n-32].
247 * Reverse lookup of irq_spi_cpu for faster compute pending:
249 * Array of bitmaps, one per VCPU, describing if IRQn is
250 * routed to a particular VCPU.
252 struct vgic_bitmap *irq_spi_target;
254 /* Target MPIDR for each IRQ (needed for GICv3 IROUTERn) only */
257 /* Bitmap indicating which CPU has something pending */
258 unsigned long *irq_pending_on_cpu;
260 /* Bitmap indicating which CPU has active IRQs */
261 unsigned long *irq_active_on_cpu;
263 struct vgic_vm_ops vm_ops;
264 struct vgic_io_device dist_iodev;
265 struct vgic_io_device *redist_iodevs;
267 /* Virtual irq to hwirq mapping */
268 spinlock_t irq_phys_map_lock;
269 struct list_head irq_phys_map_list;
272 struct vgic_v2_cpu_if {
275 u32 vgic_misr; /* Saved only */
276 u64 vgic_eisr; /* Saved only */
277 u64 vgic_elrsr; /* Saved only */
279 u32 vgic_lr[VGIC_V2_MAX_LRS];
282 struct vgic_v3_cpu_if {
283 #ifdef CONFIG_KVM_ARM_VGIC_V3
286 u32 vgic_sre; /* Restored only, change ignored */
287 u32 vgic_misr; /* Saved only */
288 u32 vgic_eisr; /* Saved only */
289 u32 vgic_elrsr; /* Saved only */
292 u64 vgic_lr[VGIC_V3_MAX_LRS];
297 /* Pending/active/both interrupts on this VCPU */
298 DECLARE_BITMAP(pending_percpu, VGIC_NR_PRIVATE_IRQS);
299 DECLARE_BITMAP(active_percpu, VGIC_NR_PRIVATE_IRQS);
300 DECLARE_BITMAP(pend_act_percpu, VGIC_NR_PRIVATE_IRQS);
302 /* Pending/active/both shared interrupts, dynamically sized */
303 unsigned long *pending_shared;
304 unsigned long *active_shared;
305 unsigned long *pend_act_shared;
307 /* Number of list registers on this CPU */
310 /* CPU vif control registers for world switch */
312 struct vgic_v2_cpu_if vgic_v2;
313 struct vgic_v3_cpu_if vgic_v3;
316 /* Protected by the distributor's irq_phys_map_lock */
317 struct list_head irq_phys_map_list;
320 #define LR_EMPTY 0xff
322 #define INT_STATUS_EOI (1 << 0)
323 #define INT_STATUS_UNDERFLOW (1 << 1)
328 int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
329 int kvm_vgic_hyp_init(void);
330 int kvm_vgic_map_resources(struct kvm *kvm);
331 int kvm_vgic_get_max_vcpus(void);
332 void kvm_vgic_early_init(struct kvm *kvm);
333 int kvm_vgic_create(struct kvm *kvm, u32 type);
334 void kvm_vgic_destroy(struct kvm *kvm);
335 void kvm_vgic_vcpu_early_init(struct kvm_vcpu *vcpu);
336 void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu);
337 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu);
338 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu);
339 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
341 int kvm_vgic_inject_mapped_irq(struct kvm *kvm, int cpuid,
342 struct irq_phys_map *map, bool level);
343 void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg);
344 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu);
345 struct irq_phys_map *kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu,
346 int virt_irq, int irq);
347 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, struct irq_phys_map *map);
348 bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, struct irq_phys_map *map);
350 #define irqchip_in_kernel(k) (!!((k)->arch.vgic.in_kernel))
351 #define vgic_initialized(k) (!!((k)->arch.vgic.nr_cpus))
352 #define vgic_ready(k) ((k)->arch.vgic.ready)
354 int vgic_v2_probe(struct device_node *vgic_node,
355 const struct vgic_ops **ops,
356 const struct vgic_params **params);
357 #ifdef CONFIG_KVM_ARM_VGIC_V3
358 int vgic_v3_probe(struct device_node *vgic_node,
359 const struct vgic_ops **ops,
360 const struct vgic_params **params);
362 static inline int vgic_v3_probe(struct device_node *vgic_node,
363 const struct vgic_ops **ops,
364 const struct vgic_params **params)