Merge: Volume Management Device (VMD) driver fixes

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/1764

This series updates RHEL9's Volume Management Device (VMD) driver with a
couple of small, but important, fixes.

Both patches apply cleanly with no conflicts.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2136299
Depends: N/A

Signed-off-by: Myron Stowe <mstowe@redhat.com>

Approved-by: John W. Linville <linville@redhat.com>
Approved-by: Steve Best <sbest@redhat.com>
Approved-by: Tony Camuso <tcamuso@redhat.com>
Approved-by: Lenny Szubowicz <lszubowi@redhat.com>

Signed-off-by: Herton R. Krzesinski <herton@redhat.com>

Author: Herton R. Krzesinski

drivers/pci/controller/vmd.c

@@ -719,6 +719,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 	resource_size_t offset[2] = {0};
 	resource_size_t membar2_offset = 0x2000;
 	struct pci_bus *child;
+	struct pci_dev *dev;
 	int ret;
 
 	/*
@@ -859,8 +860,25 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 
 	pci_scan_child_bus(vmd->bus);
 	vmd_domain_reset(vmd);
-	list_for_each_entry(child, &vmd->bus->children, node)
-		pci_reset_bus(child->self);
+
+	/* When Intel VMD is enabled, the OS does not discover the Root Ports
+	 * owned by Intel VMD within the MMCFG space. pci_reset_bus() applies
+	 * a reset to the parent of the PCI device supplied as argument. This
+	 * is why we pass a child device, so the reset can be triggered at
+	 * the Intel bridge level and propagated to all the children in the
+	 * hierarchy.
+	 */
+	list_for_each_entry(child, &vmd->bus->children, node) {
+		if (!list_empty(&child->devices)) {
+			dev = list_first_entry(&child->devices,
+					       struct pci_dev, bus_list);
+			if (pci_reset_bus(dev))
+				pci_warn(dev, "can't reset device: %d\n", ret);
+
+			break;
+		}
+	}
+
 	pci_assign_unassigned_bus_resources(vmd->bus);
 
 	/*
@@ -980,6 +998,11 @@ static int vmd_resume(struct device *dev)
 	struct vmd_dev *vmd = pci_get_drvdata(pdev);
 	int err, i;
 
+       if (vmd->irq_domain)
+               vmd_set_msi_remapping(vmd, true);
+       else
+               vmd_set_msi_remapping(vmd, false);
+
 	for (i = 0; i < vmd->msix_count; i++) {
 		err = devm_request_irq(dev, vmd->irqs[i].virq,
 				       vmd_irq, IRQF_NO_THREAD,