From: Vasant Hegde <vasant.hegde@amd.com>
Date: Wed, 6 Jul 2022 11:38:01 +0000 (+0530)
Subject: iommu/amd: Introduce per PCI segment device table size
X-Git-Tag: v6.6.17~6865^2^8~36
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b5c852907e0e8a52f8660235390b831ce0a2b50c;p=platform%2Fkernel%2Flinux-rpi.git

iommu/amd: Introduce per PCI segment device table size

With multiple pci segment support, number of BDF supported by each
segment may differ. Hence introduce per segment device table size
which depends on last_bdf. This will replace global
"device_table_size" variable.

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/20220706113825.25582-12-vasant.hegde@amd.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 8be8f3d..1dbe9c7 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -555,6 +555,9 @@ struct amd_iommu_pci_seg {
 	/* Largest PCI device id we expect translation requests for */
 	u16 last_bdf;
 
+	/* Size of the device table */
+	u32 dev_table_size;
+
 	/*
 	 * device table virtual address
 	 *
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 50be138..2950184 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -416,6 +416,7 @@ static void iommu_set_cwwb_range(struct amd_iommu *iommu)
 static void iommu_set_device_table(struct amd_iommu *iommu)
 {
 	u64 entry;
+	u32 dev_table_size = iommu->pci_seg->dev_table_size;
 
 	BUG_ON(iommu->mmio_base == NULL);
 
@@ -652,7 +653,7 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table, u16 pci_
 static inline int __init alloc_dev_table(struct amd_iommu_pci_seg *pci_seg)
 {
 	pci_seg->dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32,
-						      get_order(dev_table_size));
+						      get_order(pci_seg->dev_table_size));
 	if (!pci_seg->dev_table)
 		return -ENOMEM;
 
@@ -662,7 +663,7 @@ static inline int __init alloc_dev_table(struct amd_iommu_pci_seg *pci_seg)
 static inline void free_dev_table(struct amd_iommu_pci_seg *pci_seg)
 {
 	free_pages((unsigned long)pci_seg->dev_table,
-		    get_order(dev_table_size));
+		    get_order(pci_seg->dev_table_size));
 	pci_seg->dev_table = NULL;
 }
 
@@ -1035,7 +1036,7 @@ static bool __copy_device_table(struct amd_iommu *iommu)
 	entry = (((u64) hi) << 32) + lo;
 
 	old_devtb_size = ((entry & ~PAGE_MASK) + 1) << 12;
-	if (old_devtb_size != dev_table_size) {
+	if (old_devtb_size != pci_seg->dev_table_size) {
 		pr_err("The device table size of IOMMU:%d is not expected!\n",
 			iommu->index);
 		return false;
@@ -1054,15 +1055,15 @@ static bool __copy_device_table(struct amd_iommu *iommu)
 	}
 	old_devtb = (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT) && is_kdump_kernel())
 		    ? (__force void *)ioremap_encrypted(old_devtb_phys,
-							dev_table_size)
-		    : memremap(old_devtb_phys, dev_table_size, MEMREMAP_WB);
+							pci_seg->dev_table_size)
+		    : memremap(old_devtb_phys, pci_seg->dev_table_size, MEMREMAP_WB);
 
 	if (!old_devtb)
 		return false;
 
 	gfp_flag = GFP_KERNEL | __GFP_ZERO | GFP_DMA32;
 	pci_seg->old_dev_tbl_cpy = (void *)__get_free_pages(gfp_flag,
-						    get_order(dev_table_size));
+						    get_order(pci_seg->dev_table_size));
 	if (pci_seg->old_dev_tbl_cpy == NULL) {
 		pr_err("Failed to allocate memory for copying old device table!\n");
 		memunmap(old_devtb);
@@ -1581,6 +1582,7 @@ 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);
 
 	pci_seg->id = id;
 	init_llist_head(&pci_seg->dev_data_list);
@@ -2678,7 +2680,7 @@ static void early_enable_iommus(void)
 		for_each_pci_segment(pci_seg) {
 			if (pci_seg->old_dev_tbl_cpy != NULL) {
 				free_pages((unsigned long)pci_seg->old_dev_tbl_cpy,
-						get_order(dev_table_size));
+						get_order(pci_seg->dev_table_size));
 				pci_seg->old_dev_tbl_cpy = NULL;
 			}
 		}
@@ -2692,7 +2694,7 @@ static void early_enable_iommus(void)
 
 		for_each_pci_segment(pci_seg) {
 			free_pages((unsigned long)pci_seg->dev_table,
-				   get_order(dev_table_size));
+				   get_order(pci_seg->dev_table_size));
 			pci_seg->dev_table = pci_seg->old_dev_tbl_cpy;
 		}