On Fri, Apr 19, 2024 at 8:53 AM Eric Cheng <eric.cheng.linux@xxxxxxxxx> wrote:
>
> On 3/7/2024 10:03 PM, Anup Patel wrote:
>
> > +static int __init imsic_parse_fwnode(struct fwnode_handle *fwnode,
> > + struct imsic_global_config *global,
> > + u32 *nr_parent_irqs,
> > + u32 *nr_mmios)
> > +{
>
> ...
>
> > + /*
> > + * Find first bit position of group index.
> > + * If not specified assumed the default APLIC-IMSIC configuration.
> > + */
> > + rc = of_property_read_u32(to_of_node(fwnode), "riscv,group-index-shift",
> > + &global->group_index_shift);
> > + if (rc)
> > + global->group_index_shift = IMSIC_MMIO_PAGE_SHIFT * 2;
> > +
> > + /* Find number of interrupt identities */
> > + rc = of_property_read_u32(to_of_node(fwnode), "riscv,num-ids",
> > + &global->nr_ids);
>
> Will here check if the pass-in interrupt identity number is (multi-64 -1) &&
> between [63, 2047]?
> Per spec AIA v1.0, Sec. 3.1 Interrupt files and interrupt identities:
> "The number of interrupt identities supported by an interrupt file (and hence
> the number of active
> bits in each array) is one less than a multiple of 64, and may be a minimum of
> 63 and a maximum
> of 2047."
There is already a check on global->nr_ids to ensure the above is satisfied.
Please see further below in imsic_parse_fwnode() function.
>
> > + if (rc) {
> > + pr_err("%pfwP: number of interrupt identities not found\n", fwnode);
> > + return rc;
> > + }
> > +
> ...
>
>
Regards,
Anup
