Re: [PATCH v3 02/18] iommu/vt-d: Add DEV-MSI support

[Dey, Megha]

Hi Thomas,

On 9/30/2020 11:32 AM, Thomas Gleixner wrote:
> On Tue, Sep 15 2020 at 16:27, Dave Jiang wrote:
> > @@ -1303,9 +1303,10 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
> >   	case X86_IRQ_ALLOC_TYPE_HPET:
> >   	case X86_IRQ_ALLOC_TYPE_PCI_MSI:
> >   	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
> > +	case X86_IRQ_ALLOC_TYPE_DEV_MSI:
> >   		if (info->type == X86_IRQ_ALLOC_TYPE_HPET)
> >   			set_hpet_sid(irte, info->devid);
> > -		else
> > +		else if (info->type != X86_IRQ_ALLOC_TYPE_DEV_MSI)
> >   			set_msi_sid(irte,
> >   			msi_desc_to_pci_dev(info->desc));
> Gah. this starts to become unreadable.
hmm ok will change it.
> diff --git a/drivers/iommu/intel/irq_remapping.c b/drivers/iommu/intel/irq_remapping.c
> index 8f4ce72570ce..0c1ea8ceec31 100644
> --- a/drivers/iommu/intel/irq_remapping.c
> +++ b/drivers/iommu/intel/irq_remapping.c
> @@ -1271,6 +1271,16 @@ static struct irq_chip intel_ir_chip = {
>   	.irq_set_vcpu_affinity	= intel_ir_set_vcpu_affinity,
>   };
>   
> +static void irte_prepare_msg(struct msi_msg *msg, int index, int subhandle)
> +{
> +	msg->address_hi = MSI_ADDR_BASE_HI;
> +	msg->data = sub_handle;
> +	msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
> +			  MSI_ADDR_IR_SHV |
> +			  MSI_ADDR_IR_INDEX1(index) |
> +			  MSI_ADDR_IR_INDEX2(index);
> +}
> +
>   static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
>   					     struct irq_cfg *irq_cfg,
>   					     struct irq_alloc_info *info,
> @@ -1312,19 +1322,18 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
>   		break;
>   
>   	case X86_IRQ_ALLOC_TYPE_HPET:
> +		set_hpet_sid(irte, info->hpet_id);
> +		irte_prepare_msg(msg, index, sub_handle);
> +		break;
> +
>   	case X86_IRQ_ALLOC_TYPE_MSI:
>   	case X86_IRQ_ALLOC_TYPE_MSIX:
> -		if (info->type == X86_IRQ_ALLOC_TYPE_HPET)
> -			set_hpet_sid(irte, info->hpet_id);
> -		else
> -			set_msi_sid(irte, info->msi_dev);
> -
> -		msg->address_hi = MSI_ADDR_BASE_HI;
> -		msg->data = sub_handle;
> -		msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
> -				  MSI_ADDR_IR_SHV |
> -				  MSI_ADDR_IR_INDEX1(index) |
> -				  MSI_ADDR_IR_INDEX2(index);
> +		set_msi_sid(irte, info->msi_dev);
> +		irte_prepare_msg(msg, index, sub_handle);
> +		break;
> +
> +	case X86_IRQ_ALLOC_TYPE_DEV_MSI:
> +		irte_prepare_msg(msg, index, sub_handle);
>   		break;
>   
>   	default:
>
> Hmm?

ok so I have no clue what happened here. This was the patch that was 
sent out:

https://lore.kernel.org/lkml/160021246905.67751.1674517279122764758.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxx/

and this does not have the above change. Not sure what happened here.

Anyways, this should not be there.

> Thanks,
>
>          tglx