iommu/amd: Introduce per PCI segment dev_data_list

This will replace global dev_data_list.
Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-7-vasant.hegde@amd.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/amd_iommu_types.h

@@ -546,6 +546,9 @@ struct amd_iommu_pci_seg {
 	/* List with all PCI segments in the system */
 	struct list_head list;
 
+	/* List of all available dev_data structures */
+	struct llist_head dev_data_list;
+
 	/* PCI segment number */
 	u16 id;
 

drivers/iommu/amd/init.c

@@ -1527,6 +1527,7 @@ static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id)
 		return NULL;
 
 	pci_seg->id = id;
+	init_llist_head(&pci_seg->dev_data_list);
 	list_add_tail(&pci_seg->list, &amd_iommu_pci_seg_list);
 
 	if (alloc_dev_table(pci_seg))

drivers/iommu/amd/iommu.c

@@ -62,9 +62,6 @@
 
 static DEFINE_SPINLOCK(pd_bitmap_lock);
 
-/* List of all available dev_data structures */
-static LLIST_HEAD(dev_data_list);
-
 LIST_HEAD(ioapic_map);
 LIST_HEAD(hpet_map);
 LIST_HEAD(acpihid_map);
@@ -195,9 +192,10 @@ static struct protection_domain *to_pdomain(struct iommu_domain *dom)
 	return container_of(dom, struct protection_domain, domain);
 }
 
-static struct iommu_dev_data *alloc_dev_data(u16 devid)
+static struct iommu_dev_data *alloc_dev_data(struct amd_iommu *iommu, u16 devid)
 {
 	struct iommu_dev_data *dev_data;
+	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
 
 	dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
 	if (!dev_data)
@@ -207,19 +205,20 @@ static struct iommu_dev_data *alloc_dev_data(u16 devid)
 	dev_data->devid = devid;
 	ratelimit_default_init(&dev_data->rs);
 
-	llist_add(&dev_data->dev_data_list, &dev_data_list);
+	llist_add(&dev_data->dev_data_list, &pci_seg->dev_data_list);
 	return dev_data;
 }
 
-static struct iommu_dev_data *search_dev_data(u16 devid)
+static struct iommu_dev_data *search_dev_data(struct amd_iommu *iommu, u16 devid)
 {
 	struct iommu_dev_data *dev_data;
 	struct llist_node *node;
+	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
 
-	if (llist_empty(&dev_data_list))
+	if (llist_empty(&pci_seg->dev_data_list))
 		return NULL;
 
-	node = dev_data_list.first;
+	node = pci_seg->dev_data_list.first;
 	llist_for_each_entry(dev_data, node, dev_data_list) {
 		if (dev_data->devid == devid)
 			return dev_data;
@@ -288,10 +287,10 @@ static struct iommu_dev_data *find_dev_data(u16 devid)
 	struct iommu_dev_data *dev_data;
 	struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
 
-	dev_data = search_dev_data(devid);
+	dev_data = search_dev_data(iommu, devid);
 
 	if (dev_data == NULL) {
-		dev_data = alloc_dev_data(devid);
+		dev_data = alloc_dev_data(iommu, devid);
 		if (!dev_data)
 			return NULL;
 
@@ -3466,7 +3465,7 @@ static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
 	struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
 	struct amd_ir_data *ir_data = data->chip_data;
 	struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
-	struct iommu_dev_data *dev_data = search_dev_data(irte_info->devid);
+	struct iommu_dev_data *dev_data = search_dev_data(NULL, irte_info->devid);
 
 	/* Note:
 	 * This device has never been set up for guest mode.