1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * s390 kvm PCI passthrough support
4 *
5 * Copyright IBM Corp. 2022
6 *
7 * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
8 */
9
10 #ifndef __KVM_S390_PCI_H
11 #define __KVM_S390_PCI_H
12
13 #include <linux/kvm.h>
14 #include <linux/kvm_host.h>
15 #include <linux/mutex.h>
16 #include <linux/pci.h>
17 #include <asm/airq.h>
18 #include <asm/cpu.h>
19
20 struct kvm_zdev {
21 struct zpci_dev *zdev;
22 struct kvm *kvm;
23 struct zpci_fib fib;
24 struct list_head entry;
25 };
26
27 struct zpci_gaite {
28 u32 gisa;
29 u8 gisc;
30 u8 count;
31 u8 reserved;
32 u8 aisbo;
33 u64 aisb;
34 };
35
36 struct zpci_aift {
37 struct zpci_gaite *gait;
38 struct airq_iv *sbv;
39 struct kvm_zdev **kzdev;
40 spinlock_t gait_lock; /* Protects the gait, used during AEN forward */
41 struct mutex aift_lock; /* Protects the other structures in aift */
42 };
43
44 extern struct zpci_aift *aift;
45
46 static inline struct kvm *kvm_s390_pci_si_to_kvm(struct zpci_aift *aift,
47 unsigned long si)
48 {
49 if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || !aift->kzdev ||
50 !aift->kzdev[si])
51 return NULL;
52 return aift->kzdev[si]->kvm;
53 };
54
55 int kvm_s390_pci_aen_init(u8 nisc);
56 void kvm_s390_pci_aen_exit(void);
57
58 void kvm_s390_pci_init_list(struct kvm *kvm);
59 void kvm_s390_pci_clear_list(struct kvm *kvm);
60
61 int kvm_s390_pci_zpci_op(struct kvm *kvm, struct kvm_s390_zpci_op *args);
62
63 int __init kvm_s390_pci_init(void);
64 void kvm_s390_pci_exit(void);
65
66 static inline bool kvm_s390_pci_interp_allowed(void)
67 {
68 struct cpuid cpu_id;
69
70 get_cpu_id(&cpu_id);
71 switch (cpu_id.machine) {
72 case 0x2817:
73 case 0x2818:
74 case 0x2827:
75 case 0x2828:
76 case 0x2964:
77 case 0x2965:
78 /* No SHM on certain machines */
79 return false;
80 default:
81 return (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) &&
82 sclp.has_zpci_lsi && sclp.has_aeni && sclp.has_aisi &&
83 sclp.has_aisii);
84 }
85 }
86
87 #endif /* __KVM_S390_PCI_H */
88
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