79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Processor Activity Instrumentation support for cryptography counters
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*
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* Copyright IBM Corp. 2022
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* Author(s): Thomas Richter <tmricht@linux.ibm.com>
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*/
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#ifndef _ASM_S390_PAI_H
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#define _ASM_S390_PAI_H
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#include <linux/jump_label.h>
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#include <asm/lowcore.h>
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#include <asm/ptrace.h>
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struct qpaci_info_block {
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u64 header;
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struct {
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u64 : 8;
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u64 num_cc : 8; /* # of supported crypto counters */
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u64 : 9;
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u64 num_nnpa : 7; /* # of supported NNPA counters */
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u64 : 32;
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};
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};
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static inline int qpaci(struct qpaci_info_block *info)
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{
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/* Size of info (in double words minus one) */
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size_t size = sizeof(*info) / sizeof(u64) - 1;
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int cc;
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asm volatile(
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" lgr 0,%[size]\n"
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" .insn s,0xb28f0000,%[info]\n"
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" lgr %[size],0\n"
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" ipm %[cc]\n"
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" srl %[cc],28\n"
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: [cc] "=d" (cc), [info] "=Q" (*info), [size] "+&d" (size)
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:
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: "0", "cc", "memory");
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return cc ? (size + 1) * sizeof(u64) : 0;
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}
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#define PAI_CRYPTO_BASE 0x1000 /* First event number */
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#define PAI_CRYPTO_MAXCTR 256 /* Max # of event counters */
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#define PAI_CRYPTO_KERNEL_OFFSET 2048
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#define PAI_NNPA_BASE 0x1800 /* First event number */
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#define PAI_NNPA_MAXCTR 128 /* Max # of event counters */
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DECLARE_STATIC_KEY_FALSE(pai_key);
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static __always_inline void pai_kernel_enter(struct pt_regs *regs)
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{
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if (!IS_ENABLED(CONFIG_PERF_EVENTS))
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return;
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if (!static_branch_unlikely(&pai_key))
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return;
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if (!S390_lowcore.ccd)
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return;
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if (!user_mode(regs))
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return;
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WRITE_ONCE(S390_lowcore.ccd, S390_lowcore.ccd | PAI_CRYPTO_KERNEL_OFFSET);
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}
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static __always_inline void pai_kernel_exit(struct pt_regs *regs)
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{
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if (!IS_ENABLED(CONFIG_PERF_EVENTS))
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return;
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if (!static_branch_unlikely(&pai_key))
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return;
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if (!S390_lowcore.ccd)
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return;
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if (!user_mode(regs))
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return;
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WRITE_ONCE(S390_lowcore.ccd, S390_lowcore.ccd & ~PAI_CRYPTO_KERNEL_OFFSET);
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}
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#endif
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