[PATCH v2 18/23] iommu/amd: Use roundup_pow_two() instead of get_order()
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2025-02-14 17:44:12
Also in:
asahi, linux-iommu, linux-patches, linux-riscv, linux-rockchip, linux-samsung-soc, linux-sunxi, linux-tegra
Subsystem:
amd iommu (amd-vi), iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
If x >= PAGE_SIZE then: 1 << (get_order(x) + PAGE_SHIFT) == roundup_pow_two() Inline this into the only caller, compute the size of the HW device table in terms of 4K pages which matches the HW definition. Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> --- drivers/iommu/amd/init.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index fb3c3d17efc167..e3f4283ebbc201 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c@@ -245,14 +245,6 @@ static void init_translation_status(struct amd_iommu *iommu) iommu->flags |= AMD_IOMMU_FLAG_TRANS_PRE_ENABLED; } -static inline unsigned long tbl_size(int entry_size, int last_bdf) -{ - unsigned shift = PAGE_SHIFT + - get_order((last_bdf + 1) * entry_size); - - return 1UL << shift; -} - int amd_iommu_get_num_iommus(void) { return amd_iommus_present;
@@ -1603,7 +1595,9 @@ 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->dev_table_size = + max(roundup_pow_of_two((last_bdf + 1) * DEV_TABLE_ENTRY_SIZE), + SZ_4K); pci_seg->id = id; init_llist_head(&pci_seg->dev_data_list);
--
2.43.0