Re: [PATCH v13 15/21] PCI: microchip: Add event irqchip field to host port and add PLDA irqchip

Lorenzo Pieralisi
2023-12-21T15:33:08Z

On Thu, Dec 21, 2023 at 06:56:22PM +0800, Minda Chen wrote:
>
>
> On 2023/12/14 15:28, Minda Chen wrote:
> > PolarFire PCIE event IRQs includes PLDA local interrupts and PolarFire
> > their own IRQs. PolarFire PCIe event irq_chip ops using an event_desc to
> > unify different IRQ register addresses. On PLDA sides, PLDA irqchip codes
> > only require to set PLDA local interrupt register. So the PLDA irqchip ops
> > codes can not be extracted from PolarFire codes.
> >
> > To support PLDA its own event IRQ process, implements PLDA irqchip ops and
> > add event irqchip field to struct pcie_plda_rp.
> >
> > Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
> > ---
> > .../pci/controller/plda/pcie-microchip-host.c | 65 ++++++++++++++++++-
> > drivers/pci/controller/plda/pcie-plda.h | 3 +
> > 2 files changed, 67 insertions(+), 1 deletion(-)
> >
> Hi Conor
> Could you take time to review this patch? For I using event irq chip instead of event ops and the whole patch have been changed. I think it's better
> And I added the implementation of PLDA event irqchip and make it easier to claim the necessity of the modification.
> If you approve this, I will add back the review tag. Thanks
>
> Hi Lorenzo
> Have you reviewed this patch？ Does the commit message and the codes are can be approved ？Thanks
>

Please wrap the lines at 75 columns in length.

I have not reviewed but I am still struggling to understand the
commit log, I apologise, I can try to review the series and figure
out what the patch is doing but I would appreciate if commits logs
could be made easier to parse.

Thanks,
Lorenzo

> > diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
> > index fd0d92c3d03f..ff40c1622173 100644
> > --- a/drivers/pci/controller/plda/pcie-microchip-host.c
> > +++ b/drivers/pci/controller/plda/pcie-microchip-host.c
> > @@ -771,6 +771,63 @@ static struct irq_chip mc_event_irq_chip = {
> > .irq_unmask = mc_unmask_event_irq,
> > };
> > > +static u32 plda_hwirq_to_mask(int hwirq)
> > +{
> > + u32 mask;
> > +
> > + if (hwirq < EVENT_PM_MSI_INT_INTX)
> > + mask = BIT(hwirq + A_ATR_EVT_POST_ERR_SHIFT);
> > + else if (hwirq == EVENT_PM_MSI_INT_INTX)
> > + mask = PM_MSI_INT_INTX_MASK;
> > + else
> > + mask = BIT(hwirq + PM_MSI_TO_MASK_OFFSET);
> > +
> > + return mask;
> > +}
> > +
> > +static void plda_ack_event_irq(struct irq_data *data)
> > +{
> > + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> > +
> > + writel_relaxed(plda_hwirq_to_mask(data->hwirq),
> > + port->bridge_addr + ISTATUS_LOCAL);
> > +}
> > +
> > +static void plda_mask_event_irq(struct irq_data *data)
> > +{
> > + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> > + u32 mask, val;
> > +
> > + mask = plda_hwirq_to_mask(data->hwirq);
> > +
> > + raw_spin_lock(&port->lock);
> > + val = readl_relaxed(port->bridge_addr + IMASK_LOCAL);
> > + val &= ~mask;
> > + writel_relaxed(val, port->bridge_addr + IMASK_LOCAL);
> > + raw_spin_unlock(&port->lock);
> > +}
> > +
> > +static void plda_unmask_event_irq(struct irq_data *data)
> > +{
> > + struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
> > + u32 mask, val;
> > +
> > + mask = plda_hwirq_to_mask(data->hwirq);
> > +
> > + raw_spin_lock(&port->lock);
> > + val = readl_relaxed(port->bridge_addr + IMASK_LOCAL);
> > + val |= mask;
> > + writel_relaxed(val, port->bridge_addr + IMASK_LOCAL);
> > + raw_spin_unlock(&port->lock);
> > +}
> > +
> > +static struct irq_chip plda_event_irq_chip = {
> > + .name = "PLDA PCIe EVENT",
> > + .irq_ack = plda_ack_event_irq,
> > + .irq_mask = plda_mask_event_irq,
> > + .irq_unmask = plda_unmask_event_irq,
> > +};
> > +
> > static const struct plda_event_ops plda_event_ops = {
> > .get_events = plda_get_events,
> > };
> > @@ -778,7 +835,9 @@ static const struct plda_event_ops plda_event_ops = {
> > static int plda_pcie_event_map(struct irq_domain *domain, unsigned int irq,
> > irq_hw_number_t hwirq)
> > {
> > - irq_set_chip_and_handler(irq, &mc_event_irq_chip, handle_level_irq);
> > + struct plda_pcie_rp *port = (void *)domain->host_data;
> > +
> > + irq_set_chip_and_handler(irq, port->event_irq_chip, handle_level_irq);
> > irq_set_chip_data(irq, domain->host_data);
> >
> > return 0;
> > @@ -963,6 +1022,9 @@ static int plda_init_interrupts(struct platform_device *pdev,
> > if (!port->event_ops)
> > port->event_ops = &plda_event_ops;
> >
> > + if (!port->event_irq_chip)
> > + port->event_irq_chip = &plda_event_irq_chip;
> > +
> > ret = plda_pcie_init_irq_domains(port);
> > if (ret) {
> > dev_err(dev, "failed creating IRQ domains\n");
> > @@ -1040,6 +1102,7 @@ static int mc_platform_init(struct pci_config_window *cfg)
> > return ret;
> >
> > port->plda.event_ops = &mc_event_ops;
> > + port->plda.event_irq_chip = &mc_event_irq_chip;
> >
> > /* Address translation is up; safe to enable interrupts */
> > ret = plda_init_interrupts(pdev, &port->plda, &mc_event);
> > diff --git a/drivers/pci/controller/plda/pcie-plda.h b/drivers/pci/controller/plda/pcie-plda.h
> > index dd8bc2750bfc..24ac50c458dc 100644
> > --- a/drivers/pci/controller/plda/pcie-plda.h
> > +++ b/drivers/pci/controller/plda/pcie-plda.h
> > @@ -128,6 +128,8 @@
> > * DMA end : reserved for vendor implement
> > */
> >
> > +#define PM_MSI_TO_MASK_OFFSET 19
> > +
> > struct plda_pcie_rp;
> >
> > struct plda_event_ops {
> > @@ -150,6 +152,7 @@ struct plda_pcie_rp {
> > raw_spinlock_t lock;
> > struct plda_msi msi;
> > const struct plda_event_ops *event_ops;
> > + const struct irq_chip *event_irq_chip;
> > void __iomem *bridge_addr;
> > int num_events;
> > };