Re: [PATCH v2 5/6] drivers/hv/vmbus: Get the irq number from DeviceTree

Krzysztof Kozlowski
2024-05-15T07:47:32Z

On 15/05/2024 00:43, Roman Kisel wrote:
> The vmbus driver uses ACPI for interrupt assignment on
> arm64 hence it won't function in the VTL mode where only
> DeviceTree can be used.
>
> Update the vmbus driver to discover interrupt configuration
> via DeviceTree.
>
> Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
> ---
> drivers/hv/vmbus_drv.c | 37 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index e25223cee3ab..52f01bd1c947 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -36,6 +36,7 @@
> #include <linux/syscore_ops.h>
> #include <linux/dma-map-ops.h>
> #include <linux/pci.h>
> +#include <linux/of_irq.h>
> #include <clocksource/hyperv_timer.h>
> #include <asm/mshyperv.h>
> #include "hyperv_vmbus.h"
> @@ -2316,6 +2317,34 @@ static int vmbus_acpi_add(struct platform_device *pdev)
> }
> #endif
>
> +static int __maybe_unused vmbus_of_set_irq(struct device_node *np)
> +{
> + struct irq_desc *desc;
> + int irq;
> +
> + irq = of_irq_get(np, 0);

Where is the binding for this?

> + if (irq == 0) {
> + pr_err("VMBus interrupt mapping failure\n");
> + return -EINVAL;
> + }
> + if (irq < 0) {
> + pr_err("VMBus interrupt data can't be read from DeviceTree, error %d\n", irq);
> + return irq;
> + }
> +
> + desc = irq_to_desc(irq);
> + if (!desc) {
> + pr_err("VMBus interrupt description can't be found for virq %d\n", irq);
> + return -ENODEV;
> + }
> +
> + vmbus_irq = irq;
> + vmbus_interrupt = desc->irq_data.hwirq;
> + pr_debug("VMBus virq %d, hwirq %d\n", vmbus_irq, vmbus_interrupt);
> +
> + return 0;
> +}
> +
> static int vmbus_device_add(struct platform_device *pdev)
> {
> struct resource **cur_res = &hyperv_mmio;
> @@ -2324,12 +2353,20 @@ static int vmbus_device_add(struct platform_device *pdev)
> struct device_node *np = pdev->dev.of_node;
> int ret;
>
> + pr_debug("VMBus is present in DeviceTree\n");

Not related and not really helpful. Simple entry/exit tracking is
provided already by tracing.

Best regards,
Krzysztof