static inline void nds32_pfm_write_evtsel()

in kernel/perf_event_cpu.c [337:368]

• 25 lines of code
• 3 McCabe index (conditional complexity)

static inline void nds32_pfm_write_evtsel(int idx, u32 evnum)
{
	u32 offset = 0;
	u32 ori_val = __nds32__mfsr(NDS32_SR_PFM_CTL);
	u32 ev_mask = 0;
	u32 no_kernel_mask = 0;
	u32 no_user_mask = 0;
	u32 val;

	offset = PFM_CTL_OFFSEL[idx];
	/* Clear previous mode selection, and write new one */
	no_kernel_mask = PFM_CTL_KS[idx];
	no_user_mask = PFM_CTL_KU[idx];
	ori_val &= ~no_kernel_mask;
	ori_val &= ~no_user_mask;
	if (evnum & no_kernel_mask)
		ori_val |= no_kernel_mask;

	if (evnum & no_user_mask)
		ori_val |= no_user_mask;

	/* Clear previous event selection */
	ev_mask = PFM_CTL_SEL[idx];
	ori_val &= ~ev_mask;
	evnum &= SOFTWARE_EVENT_MASK;

	/* undo the linear mapping */
	evnum = get_converted_evet_hw_num(evnum);
	val = ori_val | (evnum << offset);
	val &= ~(PFM_CTL_OVF[0] | PFM_CTL_OVF[1] | PFM_CTL_OVF[2]);
	__nds32__mtsr_isb(val, NDS32_SR_PFM_CTL);
}