From: Jason Gunthorpe <jgg@nvidia.com>
Date: Tue, 8 Apr 2025 16:54:04 +0000 (-0300)
Subject: iommu/amd: Change rlookup, irq_lookup, and alias to use kvalloc()
X-Git-Tag: v6.16-rc1~110^2^12~33
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e874c666b15bcb6280c4e747d8de3879bb728829;p=thirdparty%2Fkernel%2Flinux.git

iommu/amd: Change rlookup, irq_lookup, and alias to use kvalloc()

This is just CPU memory used by the driver to track things, it doesn't
need to use iommu-pages. All of them are indexed by devid and devid is
bounded by pci_seg->last_bdf or we are already out of bounds on the page
allocation.

Switch them to use some version of kvmalloc_array() and drop the now
unused constants and remove the tbl_size() round up to PAGE_SIZE multiples
logic.

Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/16-v4-c8663abbb606+3f7-iommu_pages_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 5089b58e528a7..5ea73f08b3880 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -29,8 +29,6 @@
  * some size calculation constants
  */
 #define DEV_TABLE_ENTRY_SIZE		32
-#define ALIAS_TABLE_ENTRY_SIZE		2
-#define RLOOKUP_TABLE_ENTRY_SIZE	(sizeof(void *))
 
 /* Capability offsets used by the driver */
 #define MMIO_CAP_HDR_OFFSET	0x00
@@ -616,12 +614,6 @@ struct amd_iommu_pci_seg {
 	/* Size of the device table */
 	u32 dev_table_size;
 
-	/* Size of the alias table */
-	u32 alias_table_size;
-
-	/* Size of the rlookup table */
-	u32 rlookup_table_size;
-
 	/*
 	 * device table virtual address
 	 *
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index b5415dd19426a..3acdbef8fbbff 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -651,8 +651,9 @@ static inline void free_dev_table(struct amd_iommu_pci_seg *pci_seg)
 /* Allocate per PCI segment IOMMU rlookup table. */
 static inline int __init alloc_rlookup_table(struct amd_iommu_pci_seg *pci_seg)
 {
-	pci_seg->rlookup_table = iommu_alloc_pages(GFP_KERNEL,
-						   get_order(pci_seg->rlookup_table_size));
+	pci_seg->rlookup_table = kvcalloc(pci_seg->last_bdf + 1,
+					  sizeof(*pci_seg->rlookup_table),
+					  GFP_KERNEL);
 	if (pci_seg->rlookup_table == NULL)
 		return -ENOMEM;
 
@@ -661,16 +662,15 @@ static inline int __init alloc_rlookup_table(struct amd_iommu_pci_seg *pci_seg)
 
 static inline void free_rlookup_table(struct amd_iommu_pci_seg *pci_seg)
 {
-	iommu_free_pages(pci_seg->rlookup_table);
+	kvfree(pci_seg->rlookup_table);
 	pci_seg->rlookup_table = NULL;
 }
 
 static inline int __init alloc_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)
 {
-	pci_seg->irq_lookup_table = iommu_alloc_pages(GFP_KERNEL,
-						      get_order(pci_seg->rlookup_table_size));
-	kmemleak_alloc(pci_seg->irq_lookup_table,
-		       pci_seg->rlookup_table_size, 1, GFP_KERNEL);
+	pci_seg->irq_lookup_table = kvcalloc(pci_seg->last_bdf + 1,
+					     sizeof(*pci_seg->irq_lookup_table),
+					     GFP_KERNEL);
 	if (pci_seg->irq_lookup_table == NULL)
 		return -ENOMEM;
 
@@ -679,8 +679,7 @@ static inline int __init alloc_irq_lookup_table(struct amd_iommu_pci_seg *pci_se
 
 static inline void free_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)
 {
-	kmemleak_free(pci_seg->irq_lookup_table);
-	iommu_free_pages(pci_seg->irq_lookup_table);
+	kvfree(pci_seg->irq_lookup_table);
 	pci_seg->irq_lookup_table = NULL;
 }
 
@@ -688,8 +687,9 @@ static int __init alloc_alias_table(struct amd_iommu_pci_seg *pci_seg)
 {
 	int i;
 
-	pci_seg->alias_table = iommu_alloc_pages(GFP_KERNEL,
-						 get_order(pci_seg->alias_table_size));
+	pci_seg->alias_table = kvmalloc_array(pci_seg->last_bdf + 1,
+					      sizeof(*pci_seg->alias_table),
+					      GFP_KERNEL);
 	if (!pci_seg->alias_table)
 		return -ENOMEM;
 
@@ -704,7 +704,7 @@ static int __init alloc_alias_table(struct amd_iommu_pci_seg *pci_seg)
 
 static void __init free_alias_table(struct amd_iommu_pci_seg *pci_seg)
 {
-	iommu_free_pages(pci_seg->alias_table);
+	kvfree(pci_seg->alias_table);
 	pci_seg->alias_table = NULL;
 }
 
@@ -1596,8 +1596,6 @@ static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id,
 	pci_seg->last_bdf = last_bdf;
 	DUMP_printk("PCI segment : 0x%0x, last bdf : 0x%04x\n", id, last_bdf);
 	pci_seg->dev_table_size     = tbl_size(DEV_TABLE_ENTRY_SIZE, last_bdf);
-	pci_seg->alias_table_size   = tbl_size(ALIAS_TABLE_ENTRY_SIZE, last_bdf);
-	pci_seg->rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE, last_bdf);
 
 	pci_seg->id = id;
 	init_llist_head(&pci_seg->dev_data_list);