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/* 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);
}
#endif
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