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

Minda Chen
2023-12-21T10:56:31Z

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

> 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;
> };