[PATCH] arm: l2x0: add PMU support

[Russell King - ARM Linux]

On Wed, Aug 17, 2016 at 05:26:31PM +0100, Mark Rutland wrote:
> +static void l2x0_pmu_counter_config_write(int idx, u32 val)
> +{
> +	writel(val, l2x0_base + L2X0_EVENT_CNT0_CFG - 4 * idx);
> +}
> +
> +static u32 l2x0_pmu_counter_read(int idx)
> +{
> +	return readl(l2x0_base + L2X0_EVENT_CNT0_VAL - 4 * idx);
> +}
> +
> +static void l2x0_pmu_counter_write(int idx, u32 val)
> +{
> +	writel(val, l2x0_base + L2X0_EVENT_CNT0_VAL - 4 * idx);
> +}
> +
> +static void __l2x0_pmu_enable(void)
> +{
> +	u32 val = readl(l2x0_base + L2X0_EVENT_CNT_CTRL);
> +	val |= L2X0_EVENT_CNT_CTRL_ENABLE;
> +	writel(val, l2x0_base + L2X0_EVENT_CNT_CTRL);
> +}
> +
> +static void __l2x0_pmu_disable(void)
> +{
> +	u32 val = readl(l2x0_base + L2X0_EVENT_CNT_CTRL);
> +	val &= ~L2X0_EVENT_CNT_CTRL_ENABLE;
> +	writel(val, l2x0_base + L2X0_EVENT_CNT_CTRL);
> +}

Are you sure you want to be using the barriered IOs here, which will
come back in and run a sync on the L2C?  Isn't that going to affect
the performance measurements?

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