iommu: Update various drivers to pass in lg2sz instead of order to iommu pages

Convert most of the places calling get_order() as an argument to the
iommu-pages allocator into order_base_2() or the _sz flavour
instead. These places already have an exact size, there is no particular
reason to use order here.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/19-v4-c8663abbb606+3f7-iommu_pages_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 15 insertions, 14 deletions

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 13b5f83e6423..df1094893eb0 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -626,8 +626,8 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table, u16 pci_
 /* Allocate per PCI segment device table */
 static inline int __init alloc_dev_table(struct amd_iommu_pci_seg *pci_seg)
 {
-	pci_seg->dev_table = iommu_alloc_pages(GFP_KERNEL | GFP_DMA32,
-					       get_order(pci_seg->dev_table_size));
+	pci_seg->dev_table = iommu_alloc_pages_sz(GFP_KERNEL | GFP_DMA32,
+						  pci_seg->dev_table_size);
 	if (!pci_seg->dev_table)
 		return -ENOMEM;
 
@@ -707,8 +707,7 @@ static void __init free_alias_table(struct amd_iommu_pci_seg *pci_seg)
  */
 static int __init alloc_command_buffer(struct amd_iommu *iommu)
 {
-	iommu->cmd_buf = iommu_alloc_pages(GFP_KERNEL,
-					   get_order(CMD_BUFFER_SIZE));
+	iommu->cmd_buf = iommu_alloc_pages_sz(GFP_KERNEL, CMD_BUFFER_SIZE);
 
 	return iommu->cmd_buf ? 0 : -ENOMEM;
 }
@@ -811,14 +810,16 @@ static void __init free_command_buffer(struct amd_iommu *iommu)
 void *__init iommu_alloc_4k_pages(struct amd_iommu *iommu, gfp_t gfp,
 				  size_t size)
 {
-	int order = get_order(size);
-	void *buf = iommu_alloc_pages(gfp, order);
+	void *buf;
 
-	if (buf &&
-	    check_feature(FEATURE_SNP) &&
-	    set_memory_4k((unsigned long)buf, (1 << order))) {
+	size = PAGE_ALIGN(size);
+	buf = iommu_alloc_pages_sz(gfp, size);
+	if (!buf)
+		return NULL;
+	if (check_feature(FEATURE_SNP) &&
+	    set_memory_4k((unsigned long)buf, size / PAGE_SIZE)) {
 		iommu_free_pages(buf);
-		buf = NULL;
+		return NULL;
 	}
 
 	return buf;
@@ -913,11 +914,11 @@ static int iommu_init_ga_log(struct amd_iommu *iommu)
 	if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
 		return 0;
 
-	iommu->ga_log = iommu_alloc_pages(GFP_KERNEL, get_order(GA_LOG_SIZE));
+	iommu->ga_log = iommu_alloc_pages_sz(GFP_KERNEL, GA_LOG_SIZE);
 	if (!iommu->ga_log)
 		goto err_out;
 
-	iommu->ga_log_tail = iommu_alloc_pages(GFP_KERNEL, get_order(8));
+	iommu->ga_log_tail = iommu_alloc_pages_sz(GFP_KERNEL, 8);
 	if (!iommu->ga_log_tail)
 		goto err_out;
 
@@ -1012,8 +1013,8 @@ static bool __copy_device_table(struct amd_iommu *iommu)
 	if (!old_devtb)
 		return false;
 
-	pci_seg->old_dev_tbl_cpy = iommu_alloc_pages(GFP_KERNEL | GFP_DMA32,
-						     get_order(pci_seg->dev_table_size));
+	pci_seg->old_dev_tbl_cpy = iommu_alloc_pages_sz(
+		GFP_KERNEL | GFP_DMA32, 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);