On Wed, Mar 6, 2024 at 9:22 PM Björn Töpel <bjorn@xxxxxxxxxx> wrote:
>
> Anup Patel <apatel@xxxxxxxxxxxxxxxx> writes:
>
> > diff --git a/drivers/irqchip/irq-riscv-aplic-msi.c b/drivers/irqchip/irq-riscv-aplic-msi.c
> > new file mode 100644
> > index 000000000000..b2a25e011bb2
> > --- /dev/null
> > +++ b/drivers/irqchip/irq-riscv-aplic-msi.c
> > +static void aplic_msi_write_msg(struct irq_data *d, struct msi_msg *msg)
> > +{
> > + unsigned int group_index, hart_index, guest_index, val;
> > + struct aplic_priv *priv = irq_data_get_irq_chip_data(d);
> > + struct aplic_msicfg *mc = &priv->msicfg;
> > + phys_addr_t tppn, tbppn, msg_addr;
> > + void __iomem *target;
> > +
> > + /* For zeroed MSI, simply write zero into the target register */
> > + if (!msg->address_hi && !msg->address_lo && !msg->data) {
> > + target = priv->regs + APLIC_TARGET_BASE;
> > + target += (d->hwirq - 1) * sizeof(u32);
> > + writel(0, target);
>
> Is the fence needed here (writel_relaxed())...
The pci_write_msg_msix() (called via pci_msi_domain_write_msg())
uses writel() hence taking inspiration from that we use writel() over here
as well.
If that's wrong then pci_write_msg_msix() must be fixed as well.
>
> > + return;
> > + }
> > +
> > + /* Sanity check on message data */
> > + WARN_ON(msg->data > APLIC_TARGET_EIID_MASK);
> > +
> > + /* Compute target MSI address */
> > + msg_addr = (((u64)msg->address_hi) << 32) | msg->address_lo;
> > + tppn = msg_addr >> APLIC_xMSICFGADDR_PPN_SHIFT;
> > +
> > + /* Compute target HART Base PPN */
> > + tbppn = tppn;
> > + tbppn &= ~APLIC_xMSICFGADDR_PPN_HART(mc->lhxs);
> > + tbppn &= ~APLIC_xMSICFGADDR_PPN_LHX(mc->lhxw, mc->lhxs);
> > + tbppn &= ~APLIC_xMSICFGADDR_PPN_HHX(mc->hhxw, mc->hhxs);
> > + WARN_ON(tbppn != mc->base_ppn);
> > +
> > + /* Compute target group and hart indexes */
> > + group_index = (tppn >> APLIC_xMSICFGADDR_PPN_HHX_SHIFT(mc->hhxs)) &
> > + APLIC_xMSICFGADDR_PPN_HHX_MASK(mc->hhxw);
> > + hart_index = (tppn >> APLIC_xMSICFGADDR_PPN_LHX_SHIFT(mc->lhxs)) &
> > + APLIC_xMSICFGADDR_PPN_LHX_MASK(mc->lhxw);
> > + hart_index |= (group_index << mc->lhxw);
> > + WARN_ON(hart_index > APLIC_TARGET_HART_IDX_MASK);
> > +
> > + /* Compute target guest index */
> > + guest_index = tppn & APLIC_xMSICFGADDR_PPN_HART(mc->lhxs);
> > + WARN_ON(guest_index > APLIC_TARGET_GUEST_IDX_MASK);
> > +
> > + /* Update IRQ TARGET register */
> > + target = priv->regs + APLIC_TARGET_BASE;
> > + target += (d->hwirq - 1) * sizeof(u32);
> > + val = FIELD_PREP(APLIC_TARGET_HART_IDX, hart_index);
> > + val |= FIELD_PREP(APLIC_TARGET_GUEST_IDX, guest_index);
> > + val |= FIELD_PREP(APLIC_TARGET_EIID, msg->data);
> > + writel(val, target);
>
> ...and here?
Same as above.
Regards,
Anup
