On Wed, 07 Nov 2007 at 15:05 +0000, Haavard Skinnemoen wrote:
> This adds the necessary architecture code to run oprofile on AVR32
> using the performance counters documented by the AVR32 Architecture
> Manual.
>
> Signed-off-by: Haavard Skinnemoen <[email protected]>
> --- /dev/null
> +++ b/arch/avr32/oprofile/op_model_avr32.c
> @@ -0,0 +1,235 @@
> +/*
> +static irqreturn_t avr32_perf_counter_interrupt(int irq, void *dev_id)
> +{
> + struct avr32_perf_counter *ctr = dev_id;
> + struct pt_regs *regs;
> + u32 pccr;
> +
> + if (likely(!(intc_get_pending(AVR32_PERFCTR_IRQ_GROUP)
> + & (1 << AVR32_PERFCTR_IRQ_LINE))))
> + return IRQ_NONE;
> +
> + regs = get_irq_regs();
> + pccr = sysreg_read(PCCR);
> +
> + /* Clear the interrupt flags we're about to handle */
> + sysreg_write(PCCR, pccr);
> +
> + /* PCCNT */
> + if (ctr->enabled && (pccr & ctr->flag_mask)) {
> + sysreg_write(PCCNT, -ctr->count);
> + oprofile_add_sample(regs, PCCNT);
> + }
> + ctr++;
> + /* PCNT0 */
> + if (ctr->enabled && (pccr & ctr->flag_mask)) {
> + sysreg_write(PCNT0, -ctr->count);
> + oprofile_add_sample(regs, PCNT0);
> + }
> + ctr++;
> + /* PCNT1 */
> + if (ctr->enabled && (pccr & ctr->flag_mask)) {
> + sysreg_write(PCNT1, -ctr->count);
> + oprofile_add_sample(regs, PCNT1);
> + }
Why not a loop here ?
--
regards,
Phe
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