Re: [PATCH V16 14/14] irqchip / ACPI: Introduce ACPI_IRQ_MODEL_LPIC for LoongArch

From: Huacai Chen
Date: Mon Jul 18 2022 - 22:25:24 EST


Hi, Jianmin,

On Mon, Jul 18, 2022 at 10:21 PM Jianmin Lv <lvjianmin@xxxxxxxxxxx> wrote:
>
> For LoongArch, ACPI_IRQ_MODEL_LPIC is introduced, and then the
> callback acpi_get_gsi_domain_id and acpi_gsi_to_irq_fallback are
> implemented.
>
> The acpi_get_gsi_domain_id callback returns related fwnode handle
> of irqdomain for different GSI range.
>
> The acpi_gsi_to_irq_fallback will create new mapping for gsi when
> the mapping of it is not found.
>
> Signed-off-by: Jianmin Lv <lvjianmin@xxxxxxxxxxx>
> ---
> drivers/acpi/bus.c | 3 +++
> drivers/irqchip/irq-loongarch-cpu.c | 38 +++++++++++++++++++++++++++++++++++++
> include/linux/acpi.h | 1 +
> 3 files changed, 42 insertions(+)
>
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 86fa61a..63fbf00 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -1145,6 +1145,9 @@ static int __init acpi_bus_init_irq(void)
> case ACPI_IRQ_MODEL_PLATFORM:
> message = "platform specific model";
> break;
> + case ACPI_IRQ_MODEL_LPIC:
> + message = "LPIC";
> + break;
> default:
> pr_info("Unknown interrupt routing model\n");
> return -ENODEV;
> diff --git a/drivers/irqchip/irq-loongarch-cpu.c b/drivers/irqchip/irq-loongarch-cpu.c
> index b4db430..a5e0bf0 100644
> --- a/drivers/irqchip/irq-loongarch-cpu.c
> +++ b/drivers/irqchip/irq-loongarch-cpu.c
> @@ -16,6 +16,42 @@
> static struct irq_domain *irq_domain;
> struct fwnode_handle *cpuintc_handle;
>
> +static u32 lpic_gsi_to_irq(u32 gsi)
> +{
> + /* Only pch irqdomain transferring is required for LoongArch. */
> + if (gsi >= GSI_MIN_PCH_IRQ && gsi <= GSI_MAX_PCH_IRQ)
> + return acpi_register_gsi(NULL, gsi, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH);
> +
> + return 0;
> +}
> +
> +static struct fwnode_handle *lpic_get_gsi_domain_id(u32 gsi)
> +{
> + int id;
> + struct fwnode_handle *domain_handle = NULL;
> +
> + switch (gsi) {
> + case GSI_MIN_CPU_IRQ ... GSI_MAX_CPU_IRQ:
> + if (liointc_handle)
> + domain_handle = liointc_handle;
> + break;
> +
> + case GSI_MIN_LPC_IRQ ... GSI_MAX_LPC_IRQ:
> + if (pch_lpc_handle)
> + domain_handle = pch_lpc_handle;
> + break;
> +
> + case GSI_MIN_PCH_IRQ ... GSI_MAX_PCH_IRQ:
> + id = find_pch_pic(gsi);
> + if (id >= 0 && pch_pic_handle[id])
> + domain_handle = pch_pic_handle[id];
> +
Remove this blank line, please.

Huacai
> + break;
> + }
> +
> + return domain_handle;
> +}
> +
> static void mask_loongarch_irq(struct irq_data *d)
> {
> clear_csr_ecfg(ECFGF(d->hwirq));
> @@ -102,6 +138,8 @@ static int __init cpuintc_acpi_init_v1(union acpi_subtable_headers *header,
> panic("Failed to add irqdomain for LoongArch CPU");
>
> set_handle_irq(&handle_cpu_irq);
> + acpi_set_irq_model(ACPI_IRQ_MODEL_LPIC, lpic_get_gsi_domain_id);
> + acpi_set_gsi_to_irq_fallback(lpic_gsi_to_irq);
> acpi_cascade_irqdomain_init();
>
> return 0;
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index e2b60d5..76520f3 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -105,6 +105,7 @@ enum acpi_irq_model_id {
> ACPI_IRQ_MODEL_IOSAPIC,
> ACPI_IRQ_MODEL_PLATFORM,
> ACPI_IRQ_MODEL_GIC,
> + ACPI_IRQ_MODEL_LPIC,
> ACPI_IRQ_MODEL_COUNT
> };
>
> --
> 1.8.3.1
>
>