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iommu/amd: Use roundup_pow_two() instead of get_order()

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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.

Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/17-v4-c8663abbb606+3f7-iommu_pages_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2025-04-08 13:54:05 -03:00 committed by Joerg Roedel
parent e874c666b1
commit 5faa04c4ed
1 changed files with 3 additions and 9 deletions
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12
drivers/iommu/amd/init.c
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@ -243,14 +243,6 @@ 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;
@ -1595,7 +1587,9 @@ 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);