RE: [PATCH v5 12/16] asm-generic/hyperv: update hv_interrupt_entry

[Michael Kelley]

From: Wei Liu <wei....@kernel.org> Sent: Wednesday, January 20, 2021 4:01 AM
> 
> We will soon use the same structure to handle IO-APIC interrupts as
> well. Introduce an enum to identify the source and a data structure for
> IO-APIC RTE.
> 
> While at it, update pci-hyperv.c to use the enum.
> 
> No functional change.
> 
> Signed-off-by: Wei Liu <wei....@kernel.org>
> Acked-by: Rob Herring <r...@kernel.org>
> ---
>  drivers/pci/controller/pci-hyperv.c |  2 +-
>  include/asm-generic/hyperv-tlfs.h   | 36 +++++++++++++++++++++++++++--
>  2 files changed, 35 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-hyperv.c 
> b/drivers/pci/controller/pci-hyperv.c
> index 6db8d96a78eb..87aa62ee0368 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -1216,7 +1216,7 @@ static void hv_irq_unmask(struct irq_data *data)
>       params = &hbus->retarget_msi_interrupt_params;
>       memset(params, 0, sizeof(*params));
>       params->partition_id = HV_PARTITION_ID_SELF;
> -     params->int_entry.source = 1; /* MSI(-X) */
> +     params->int_entry.source = HV_INTERRUPT_SOURCE_MSI;
>       hv_set_msi_entry_from_desc(&params->int_entry.msi_entry, msi_desc);
>       params->device_id = (hbus->hdev->dev_instance.b[5] << 24) |
>                          (hbus->hdev->dev_instance.b[4] << 16) |
> diff --git a/include/asm-generic/hyperv-tlfs.h 
> b/include/asm-generic/hyperv-tlfs.h
> index 7e103be42799..8423bf53c237 100644
> --- a/include/asm-generic/hyperv-tlfs.h
> +++ b/include/asm-generic/hyperv-tlfs.h
> @@ -480,6 +480,11 @@ struct hv_create_vp {
>       u64 flags;
>  } __packed;
> 
> +enum hv_interrupt_source {
> +     HV_INTERRUPT_SOURCE_MSI = 1, /* MSI and MSI-X */
> +     HV_INTERRUPT_SOURCE_IOAPIC,
> +};
> +
>  union hv_msi_address_register {
>       u32 as_uint32;
>       struct {
> @@ -513,10 +518,37 @@ union hv_msi_entry {
>       } __packed;
>  };
> 
> +union hv_ioapic_rte {
> +     u64 as_uint64;
> +
> +     struct {
> +             u32 vector:8;
> +             u32 delivery_mode:3;
> +             u32 destination_mode:1;
> +             u32 delivery_status:1;
> +             u32 interrupt_polarity:1;
> +             u32 remote_irr:1;
> +             u32 trigger_mode:1;
> +             u32 interrupt_mask:1;
> +             u32 reserved1:15;
> +
> +             u32 reserved2:24;
> +             u32 destination_id:8;
> +     };
> +
> +     struct {
> +             u32 low_uint32;
> +             u32 high_uint32;
> +     };
> +} __packed;
> +
>  struct hv_interrupt_entry {
> -     u32 source;                     /* 1 for MSI(-X) */
> +     u32 source;
>       u32 reserved1;
> -     union hv_msi_entry msi_entry;
> +     union {
> +             union hv_msi_entry msi_entry;
> +             union hv_ioapic_rte ioapic_rte;
> +     };
>  } __packed;
> 
>  /*
> --
> 2.20.1

Reviewed-by: Michael Kelley <mikel...@microsoft.com>