x86/pci/xen: Use msi_msg shadow structs

Use the msi_msg shadow structs and compose the message with named bitfields
instead of the unreadable macro maze.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201024213535.443185-18-dwmw2@infradead.org

arch/x86/pci/xen.c

@@ -152,7 +152,6 @@ static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
 
 #if defined(CONFIG_PCI_MSI)
 #include <linux/msi.h>
-#include <asm/msidef.h>
 
 struct xen_pci_frontend_ops *xen_pci_frontend;
 EXPORT_SYMBOL_GPL(xen_pci_frontend);
@@ -210,23 +209,20 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	return ret;
 }
 
-#define XEN_PIRQ_MSI_DATA  (MSI_DATA_TRIGGER_EDGE | \
-		MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
-
 static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
 		struct msi_msg *msg)
 {
-	/* We set vector == 0 to tell the hypervisor we don't care about it,
-	 * but we want a pirq setup instead.
-	 * We use the dest_id field to pass the pirq that we want. */
-	msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
-	msg->address_lo =
-		MSI_ADDR_BASE_LO |
-		MSI_ADDR_DEST_MODE_PHYSICAL |
-		MSI_ADDR_REDIRECTION_CPU |
-		MSI_ADDR_DEST_ID(pirq);
-
-	msg->data = XEN_PIRQ_MSI_DATA;
+	/*
+	 * We set vector == 0 to tell the hypervisor we don't care about
+	 * it, but we want a pirq setup instead.  We use the dest_id fields
+	 * to pass the pirq that we want.
+	 */
+	memset(msg, 0, sizeof(*msg));
+	msg->address_hi = X86_MSI_BASE_ADDRESS_HIGH;
+	msg->arch_addr_hi.destid_8_31 = pirq >> 8;
+	msg->arch_addr_lo.destid_0_7 = pirq & 0xFF;
+	msg->arch_addr_lo.base_address = X86_MSI_BASE_ADDRESS_LOW;
+	msg->arch_data.delivery_mode = APIC_DELIVERY_MODE_EXTINT;
 }
 
 static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)