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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/s390/include/asm/pai.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/include/asm/pai.h')
-rw-r--r-- | arch/s390/include/asm/pai.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pai.h b/arch/s390/include/asm/pai.h new file mode 100644 index 0000000000..7d1888e3de --- /dev/null +++ b/arch/s390/include/asm/pai.h @@ -0,0 +1,84 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Processor Activity Instrumentation support for cryptography counters + * + * Copyright IBM Corp. 2022 + * Author(s): Thomas Richter <tmricht@linux.ibm.com> + */ +#ifndef _ASM_S390_PAI_H +#define _ASM_S390_PAI_H + +#include <linux/jump_label.h> +#include <asm/lowcore.h> +#include <asm/ptrace.h> + +struct qpaci_info_block { + u64 header; + struct { + u64 : 8; + u64 num_cc : 8; /* # of supported crypto counters */ + u64 : 9; + u64 num_nnpa : 7; /* # of supported NNPA counters */ + u64 : 32; + }; +}; + +static inline int qpaci(struct qpaci_info_block *info) +{ + /* Size of info (in double words minus one) */ + size_t size = sizeof(*info) / sizeof(u64) - 1; + int cc; + + asm volatile( + " lgr 0,%[size]\n" + " .insn s,0xb28f0000,%[info]\n" + " lgr %[size],0\n" + " ipm %[cc]\n" + " srl %[cc],28\n" + : [cc] "=d" (cc), [info] "=Q" (*info), [size] "+&d" (size) + : + : "0", "cc", "memory"); + return cc ? (size + 1) * sizeof(u64) : 0; +} + +#define PAI_CRYPTO_BASE 0x1000 /* First event number */ +#define PAI_CRYPTO_MAXCTR 256 /* Max # of event counters */ +#define PAI_CRYPTO_KERNEL_OFFSET 2048 +#define PAI_NNPA_BASE 0x1800 /* First event number */ +#define PAI_NNPA_MAXCTR 128 /* Max # of event counters */ + +DECLARE_STATIC_KEY_FALSE(pai_key); + +static __always_inline void pai_kernel_enter(struct pt_regs *regs) +{ + if (!IS_ENABLED(CONFIG_PERF_EVENTS)) + return; + if (!static_branch_unlikely(&pai_key)) + return; + if (!S390_lowcore.ccd) + return; + if (!user_mode(regs)) + return; + WRITE_ONCE(S390_lowcore.ccd, S390_lowcore.ccd | PAI_CRYPTO_KERNEL_OFFSET); +} + +static __always_inline void pai_kernel_exit(struct pt_regs *regs) +{ + if (!IS_ENABLED(CONFIG_PERF_EVENTS)) + return; + if (!static_branch_unlikely(&pai_key)) + return; + if (!S390_lowcore.ccd) + return; + if (!user_mode(regs)) + return; + WRITE_ONCE(S390_lowcore.ccd, S390_lowcore.ccd & ~PAI_CRYPTO_KERNEL_OFFSET); +} + +enum paievt_mode { + PAI_MODE_NONE, + PAI_MODE_SAMPLING, + PAI_MODE_COUNTING, +}; + +#endif |