iommu/amd: Convert to use per PCI segment rlookup_table

Then, remove the global amd_iommu_rlookup_table and rlookup_table_size.

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/20220706113825.25582-21-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/amd_iommu_types.h

@@ -846,11 +846,6 @@ extern struct dev_table_entry *amd_iommu_dev_table;
  */
 extern u16 *amd_iommu_alias_table;
 
-/*
- * Reverse lookup table to find the IOMMU which translates a specific device.
- */
-extern struct amd_iommu **amd_iommu_rlookup_table;
-
 /* size of the dma_ops aperture as power of 2 */
 extern unsigned amd_iommu_aperture_order;
 

drivers/iommu/amd/init.c

@@ -200,12 +200,6 @@ struct dev_table_entry *amd_iommu_dev_table;
  */
 u16 *amd_iommu_alias_table;
 
-/*
- * The rlookup table is used to find the IOMMU which is responsible
- * for a specific device. It is also indexed by the PCI device id.
- */
-struct amd_iommu **amd_iommu_rlookup_table;
-
 /*
  * AMD IOMMU allows up to 2^16 different protection domains. This is a bitmap
  * to know which ones are already in use.
@@ -214,7 +208,6 @@ unsigned long *amd_iommu_pd_alloc_bitmap;
 
 static u32 dev_table_size;	/* size of the device table */
 static u32 alias_table_size;	/* size of the alias table */
-static u32 rlookup_table_size;	/* size if the rlookup table */
 
 enum iommu_init_state {
 	IOMMU_START_STATE,
@@ -1144,7 +1137,7 @@ void amd_iommu_apply_erratum_63(u16 devid)
 /* Writes the specific IOMMU for a device into the rlookup table */
 static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
 {
-	amd_iommu_rlookup_table[devid] = iommu;
+	iommu->pci_seg->rlookup_table[devid] = iommu;
 }
 
 /*
@@ -1826,7 +1819,7 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h,
 	 * Make sure IOMMU is not considered to translate itself. The IVRS
 	 * table tells us so, but this is a lie!
 	 */
-	amd_iommu_rlookup_table[iommu->devid] = NULL;
+	pci_seg->rlookup_table[iommu->devid] = NULL;
 
 	return 0;
 }
@@ -2786,10 +2779,6 @@ static void __init free_iommu_resources(void)
 	kmem_cache_destroy(amd_iommu_irq_cache);
 	amd_iommu_irq_cache = NULL;
 
-	free_pages((unsigned long)amd_iommu_rlookup_table,
-		   get_order(rlookup_table_size));
-	amd_iommu_rlookup_table = NULL;
-
 	free_pages((unsigned long)amd_iommu_alias_table,
 		   get_order(alias_table_size));
 	amd_iommu_alias_table = NULL;
@@ -2928,7 +2917,6 @@ static int __init early_amd_iommu_init(void)
 
 	dev_table_size     = tbl_size(DEV_TABLE_ENTRY_SIZE);
 	alias_table_size   = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
-	rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
 
 	/* Device table - directly used by all IOMMUs */
 	ret = -ENOMEM;
@@ -2947,13 +2935,6 @@ static int __init early_amd_iommu_init(void)
 	if (amd_iommu_alias_table == NULL)
 		goto out;
 
-	/* IOMMU rlookup table - find the IOMMU for a specific device */
-	amd_iommu_rlookup_table = (void *)__get_free_pages(
-			GFP_KERNEL | __GFP_ZERO,
-			get_order(rlookup_table_size));
-	if (amd_iommu_rlookup_table == NULL)
-		goto out;
-
 	amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
 					    GFP_KERNEL | __GFP_ZERO,
 					    get_order(MAX_DOMAIN_ID/8));

drivers/iommu/amd/iommu.c

@@ -287,10 +287,9 @@ static void setup_aliases(struct amd_iommu *iommu, struct device *dev)
 	clone_aliases(iommu, dev);
 }
 
-static struct iommu_dev_data *find_dev_data(u16 devid)
+static struct iommu_dev_data *find_dev_data(struct amd_iommu *iommu, u16 devid)
 {
 	struct iommu_dev_data *dev_data;
-	struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
 
 	dev_data = search_dev_data(iommu, devid);
 
@@ -388,7 +387,7 @@ static int iommu_init_device(struct amd_iommu *iommu, struct device *dev)
 	if (devid < 0)
 		return devid;
 
-	dev_data = find_dev_data(devid);
+	dev_data = find_dev_data(iommu, devid);
 	if (!dev_data)
 		return -ENOMEM;
 
@@ -403,9 +402,6 @@ static int iommu_init_device(struct amd_iommu *iommu, struct device *dev)
 	 */
 	if ((iommu_default_passthrough() || !amd_iommu_force_isolation) &&
 	    dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) {
-		struct amd_iommu *iommu;
-
-		iommu = amd_iommu_rlookup_table[dev_data->devid];
 		dev_data->iommu_v2 = iommu->is_iommu_v2;
 	}
 
@@ -416,13 +412,15 @@ static int iommu_init_device(struct amd_iommu *iommu, struct device *dev)
 
 static void iommu_ignore_device(struct amd_iommu *iommu, struct device *dev)
 {
+	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
 	int devid;
 
 	devid = get_device_id(dev);
 	if (devid < 0)
 		return;
 
-	amd_iommu_rlookup_table[devid] = NULL;
+
+	pci_seg->rlookup_table[devid] = NULL;
 	memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry));
 
 	setup_aliases(iommu, dev);
@@ -2749,8 +2747,9 @@ static struct irq_remap_table *get_irq_table(struct amd_iommu *iommu, u16 devid)
 	struct irq_remap_table *table;
 	struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
 
-	if (WARN_ONCE(!amd_iommu_rlookup_table[devid],
+	if (WARN_ONCE(!pci_seg->rlookup_table[devid],
-		      "%s: no iommu for devid %x\n", __func__, devid))
+		      "%s: no iommu for devid %x:%x\n",
+		      __func__, pci_seg->id, devid))
 		return NULL;
 
 	table = pci_seg->irq_lookup_table[devid];
@@ -2809,7 +2808,7 @@ static int set_remap_table_entry_alias(struct pci_dev *pdev, u16 alias,
 	pci_seg->irq_lookup_table[alias] = table;
 	set_dte_irq_entry(alias, table);
 
-	iommu_flush_dte(amd_iommu_rlookup_table[alias], alias);
+	iommu_flush_dte(pci_seg->rlookup_table[alias], alias);
 
 	return 0;
 }