18564756ab
Get rid of MACHINE_HAS_VX and replace it with cpu_has_vx() which is a short readable wrapper for "test_facility(129)". Facility bit 129 is set if the vector facility is present. test_facility() returns also true for all bits which are set in the architecture level set of the cpu that the kernel is compiled for. This means that test_facility(129) is a compile time constant which returns true for z13 and later, since the vector facility bit is part of the z13 kernel ALS. In result the compiled code will have less runtime checks, and less code. Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/perf_event.h>
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#include <linux/perf_regs.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/bug.h>
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#include <asm/ptrace.h>
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#include <asm/fpu/api.h>
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#include <asm/fpu/types.h>
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u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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freg_t fp;
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if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
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return regs->gprs[idx];
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if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
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if (!user_mode(regs))
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return 0;
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idx -= PERF_REG_S390_FP0;
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if (cpu_has_vx())
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fp = *(freg_t *)(current->thread.fpu.vxrs + idx);
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else
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fp = current->thread.fpu.fprs[idx];
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return fp.ui;
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}
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if (idx == PERF_REG_S390_MASK)
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return regs->psw.mask;
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if (idx == PERF_REG_S390_PC)
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return regs->psw.addr;
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WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX);
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return 0;
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}
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#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
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int perf_reg_validate(u64 mask)
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{
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if (!mask || mask & REG_RESERVED)
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return -EINVAL;
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return 0;
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}
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u64 perf_reg_abi(struct task_struct *task)
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{
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if (test_tsk_thread_flag(task, TIF_31BIT))
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return PERF_SAMPLE_REGS_ABI_32;
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return PERF_SAMPLE_REGS_ABI_64;
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}
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void perf_get_regs_user(struct perf_regs *regs_user,
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struct pt_regs *regs)
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{
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/*
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* Use the regs from the first interruption and let
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* perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
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*
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* Also save FPU registers for user-space tasks only.
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*/
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regs_user->regs = task_pt_regs(current);
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if (user_mode(regs_user->regs))
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save_fpu_regs();
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regs_user->abi = perf_reg_abi(current);
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}
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