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1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Processor Activity Instrumentation support for cryptography counters
4  *
5  *  Copyright IBM Corp. 2022
6  *  Author(s): Thomas Richter <[email protected]>
7  */
8 #ifndef _ASM_S390_PAI_H
9 #define _ASM_S390_PAI_H
10
11 #include <linux/jump_label.h>
12 #include <asm/lowcore.h>
13 #include <asm/ptrace.h>
14 #include <asm/asm.h>
15
16 struct qpaci_info_block {
17         u64 header;
18         struct {
19                 u64 : 8;
20                 u64 num_cc : 8;         /* # of supported crypto counters */
21                 u64 : 9;
22                 u64 num_nnpa : 7;       /* # of supported NNPA counters */
23                 u64 : 32;
24         };
25 };
26
27 static inline int qpaci(struct qpaci_info_block *info)
28 {
29         /* Size of info (in double words minus one) */
30         size_t size = sizeof(*info) / sizeof(u64) - 1;
31         int cc;
32
33         asm volatile(
34                 "       lgr     0,%[size]\n"
35                 "       .insn   s,0xb28f0000,%[info]\n"
36                 "       lgr     %[size],0\n"
37                 CC_IPM(cc)
38                 : CC_OUT(cc, cc), [info] "=Q" (*info), [size] "+&d" (size)
39                 :
40                 : CC_CLOBBER_LIST("0", "memory"));
41         return CC_TRANSFORM(cc) ? (size + 1) * sizeof(u64) : 0;
42 }
43
44 #define PAI_CRYPTO_BASE                 0x1000  /* First event number */
45 #define PAI_CRYPTO_MAXCTR               256     /* Max # of event counters */
46 #define PAI_CRYPTO_KERNEL_OFFSET        2048
47 #define PAI_NNPA_BASE                   0x1800  /* First event number */
48 #define PAI_NNPA_MAXCTR                 128     /* Max # of event counters */
49
50 DECLARE_STATIC_KEY_FALSE(pai_key);
51
52 static __always_inline void pai_kernel_enter(struct pt_regs *regs)
53 {
54         if (!IS_ENABLED(CONFIG_PERF_EVENTS))
55                 return;
56         if (!static_branch_unlikely(&pai_key))
57                 return;
58         if (!get_lowcore()->ccd)
59                 return;
60         if (!user_mode(regs))
61                 return;
62         WRITE_ONCE(get_lowcore()->ccd, get_lowcore()->ccd | PAI_CRYPTO_KERNEL_OFFSET);
63 }
64
65 static __always_inline void pai_kernel_exit(struct pt_regs *regs)
66 {
67         if (!IS_ENABLED(CONFIG_PERF_EVENTS))
68                 return;
69         if (!static_branch_unlikely(&pai_key))
70                 return;
71         if (!get_lowcore()->ccd)
72                 return;
73         if (!user_mode(regs))
74                 return;
75         WRITE_ONCE(get_lowcore()->ccd, get_lowcore()->ccd & ~PAI_CRYPTO_KERNEL_OFFSET);
76 }
77
78 #define PAI_SAVE_AREA(x)        ((x)->hw.event_base)
79 #define PAI_CPU_MASK(x)         ((x)->hw.addr_filters)
80 #define PAI_SWLIST(x)           (&(x)->hw.tp_list)
81
82 #endif
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