Re: [Qemu-devel] [PATCH 10/23] hw/intc/arm_gicv3: Implement functions to identify next pending irq

[Shannon Zhao]

On 2016/5/10 1:29, Peter Maydell wrote:
> +    uint32_t pend, grpmask;
> +    uint32_t pending = *gic_bmp_ptr32(s->pending, irq - GIC_INTERNAL);
> +    uint32_t edge_trigger = *gic_bmp_ptr32(s->edge_trigger, irq - 
> GIC_INTERNAL);
> +    uint32_t level = *gic_bmp_ptr32(s->level, irq - GIC_INTERNAL);
> +    uint32_t group = *gic_bmp_ptr32(s->group, irq - GIC_INTERNAL);
> +    uint32_t grpmod = *gic_bmp_ptr32(s->grpmod, irq - GIC_INTERNAL);
> +    uint32_t enable = *gic_bmp_ptr32(s->enabled, irq - GIC_INTERNAL);
> +
Since you use "irq - GIC_INTERNAL" many times, how about moving into the
gic_bmp_ptr32()?

[...]
> +/* Update the GIC status after state in the distributor has
> + * changed affecting @len interrupts starting at @start,
> + * but don't tell the CPU i/f.
> + */
> +static void gicv3_update_noirqset(GICv3State *s, int start, int len)
> +{
> +    int i;
> +    uint8_t prio;
> +    uint32_t pend = 0;
> +
> +    for (i = 0; i < s->num_cpu; i++) {
> +        s->cpu[i].seenbetter = false;
> +    }
> +
> +    /* Find the highest priority pending interrupt in this range. */
> +    for (i = start; i < start + len; i++) {
> +        GICv3CPUState *cs;
> +
The i should start from GIC_INTERNAL or you should change the parameter
of the callers.

> +        if (i == start || (i & 0x1f) == 0) {
> +            /* Calculate the next 32 bits worth of pending status */
> +            pend = gicd_int_pending(s, i & ~0x1f);
> +        }
> +
[...]
> +
> +    /* Note that we can guarantee that these functions will not
> +     * recursively call back into gicv3_full_update(), because
> +     * at each point the "previous best" is always outside the
> +     * range we ask them to update.
> +     */
> +    gicv3_update_noirqset(s, 0, s->num_irq);
> +
use GIC_INTERNAL instead of 0?


>  /**
> + * gicv3_irq_group:
> + *
> + * Return the group which this interrupt is configured as (GICV3_G0,
> + * GICV3_G1 or GICV3_G1NS).
> + */
> +static inline int gicv3_irq_group(GICv3State *s, GICv3CPUState *cs, int irq)
use uint32_t instead of int in this and other functions?

Thanks,
-- 
Shannon