x86/msi: Consolidate MSI allocation

Convert the interrupt remap drivers to retrieve the pci device from the msi
descriptor and use info::hwirq.

This is the first step to prepare x86 for using the generic MSI domain ops.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200826112332.466405395@linutronix.de

arch/x86/include/asm/hw_irq.h

@@ -86,14 +86,6 @@ struct irq_alloc_info {
 	union {
 		struct ioapic_alloc_info	ioapic;
 		struct uv_alloc_info		uv;
-
-		int		unused;
-#ifdef	CONFIG_PCI_MSI
-		struct {
-			struct pci_dev	*msi_dev;
-			irq_hw_number_t	msi_hwirq;
-		};
-#endif
 	};
 };
 

arch/x86/kernel/apic/msi.c

@@ -188,7 +188,6 @@ int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 
 	init_irq_alloc_info(&info, NULL);
 	info.type = X86_IRQ_ALLOC_TYPE_PCI_MSI;
-	info.msi_dev = dev;
 
 	domain = irq_remapping_get_irq_domain(&info);
 	if (domain == NULL)
@@ -207,7 +206,7 @@ void native_teardown_msi_irq(unsigned int irq)
 static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
 					 msi_alloc_info_t *arg)
 {
-	return arg->msi_hwirq;
+	return arg->hwirq;
 }
 
 int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
@@ -217,7 +216,6 @@ int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
 	struct msi_desc *desc = first_pci_msi_entry(pdev);
 
 	init_irq_alloc_info(arg, NULL);
-	arg->msi_dev = pdev;
 	if (desc->msi_attrib.is_msix) {
 		arg->type = X86_IRQ_ALLOC_TYPE_PCI_MSIX;
 	} else {
@@ -231,7 +229,8 @@ EXPORT_SYMBOL_GPL(pci_msi_prepare);
 
 void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 {
-	arg->msi_hwirq = pci_msi_domain_calc_hwirq(desc);
+	arg->desc = desc;
+	arg->hwirq = pci_msi_domain_calc_hwirq(desc);
 }
 EXPORT_SYMBOL_GPL(pci_msi_set_desc);
 

drivers/iommu/amd/iommu.c

@@ -3528,7 +3528,7 @@ static int get_devid(struct irq_alloc_info *info)
 		return get_hpet_devid(info->devid);
 	case X86_IRQ_ALLOC_TYPE_PCI_MSI:
 	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
-		return get_device_id(&info->msi_dev->dev);
+		return get_device_id(msi_desc_to_dev(info->desc));
 	default:
 		WARN_ON_ONCE(1);
 		return -1;
@@ -3702,7 +3702,8 @@ static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
 		   info->type == X86_IRQ_ALLOC_TYPE_PCI_MSIX) {
 		bool align = (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI);
 
-		index = alloc_irq_index(devid, nr_irqs, align, info->msi_dev);
+		index = alloc_irq_index(devid, nr_irqs, align,
+					msi_desc_to_pci_dev(info->desc));
 	} else {
 		index = alloc_irq_index(devid, nr_irqs, false, NULL);
 	}

drivers/iommu/intel/irq_remapping.c

@@ -1124,7 +1124,7 @@ static struct irq_domain *intel_get_irq_domain(struct irq_alloc_info *info)
 		return map_hpet_to_ir(info->devid);
 	case X86_IRQ_ALLOC_TYPE_PCI_MSI:
 	case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
-		return map_dev_to_ir(info->msi_dev);
+		return map_dev_to_ir(msi_desc_to_pci_dev(info->desc));
 	default:
 		WARN_ON_ONCE(1);
 		return NULL;
@@ -1293,7 +1293,7 @@ static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
 		if (info->type == X86_IRQ_ALLOC_TYPE_HPET)
 			set_hpet_sid(irte, info->devid);
 		else
-			set_msi_sid(irte, info->msi_dev);
+			set_msi_sid(irte, msi_desc_to_pci_dev(info->desc));
 
 		msg->address_hi = MSI_ADDR_BASE_HI;
 		msg->data = sub_handle;

drivers/pci/controller/pci-hyperv.c

@@ -1534,7 +1534,7 @@ static struct irq_chip hv_msi_irq_chip = {
 static irq_hw_number_t hv_msi_domain_ops_get_hwirq(struct msi_domain_info *info,
 						   msi_alloc_info_t *arg)
 {
-	return arg->msi_hwirq;
+	return arg->hwirq;
 }
 
 static struct msi_domain_ops hv_msi_ops = {