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

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Date:   Wed, 30 Sep 2020 20:32:15 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dave Jiang <dave.jiang@...el.com>, vkoul@...nel.org,
        megha.dey@...el.com, maz@...nel.org, bhelgaas@...gle.com,
        alex.williamson@...hat.com, jacob.jun.pan@...el.com,
        ashok.raj@...el.com, jgg@...lanox.com, yi.l.liu@...el.com,
        baolu.lu@...el.com, kevin.tian@...el.com, sanjay.k.kumar@...el.com,
        tony.luck@...el.com, jing.lin@...el.com, dan.j.williams@...el.com,
        kwankhede@...dia.com, eric.auger@...hat.com, parav@...lanox.com,
        jgg@...lanox.com, rafael@...nel.org, netanelg@...lanox.com,
        shahafs@...lanox.com, yan.y.zhao@...ux.intel.com,
        pbonzini@...hat.com, samuel.ortiz@...el.com, mona.hossain@...el.com
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-pci@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 02/18] iommu/vt-d: Add DEV-MSI support

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.

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?

Thanks,

        tglx