diff options
| author | Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> | 2020-12-15 10:37:03 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-01-28 18:51:18 +0300 |
| commit | 441555c63aca3300a0f6cd5948dbf5bd6e7760b3 (patch) | |
| tree | 0df0af8cb08965309f466bb4f1510018d2a55b30 /drivers/iommu/amd/io_pgtable.c | |
| parent | 0633bbcc1eedb7015554254d54e14602b1d8b989 (diff) | |
| download | linux-441555c63aca3300a0f6cd5948dbf5bd6e7760b3.tar.xz | |
iommu/amd: Introduce iommu_v1_iova_to_phys
This implements iova_to_phys for AMD IOMMU v1 pagetable,
which will be used by the IO page table framework.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20201215073705.123786-12-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd/io_pgtable.c')
| -rw-r--r-- | drivers/iommu/amd/io_pgtable.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c index d7924eb20178..b70eb79d05fb 100644 --- a/drivers/iommu/amd/io_pgtable.c +++ b/drivers/iommu/amd/io_pgtable.c @@ -488,6 +488,26 @@ unsigned long iommu_unmap_page(struct protection_domain *dom, return unmapped; } +static phys_addr_t iommu_v1_iova_to_phys(struct io_pgtable_ops *ops, unsigned long iova) +{ + struct amd_io_pgtable *pgtable = io_pgtable_ops_to_data(ops); + unsigned long offset_mask, pte_pgsize; + u64 *pte, __pte; + + if (pgtable->mode == PAGE_MODE_NONE) + return iova; + + pte = fetch_pte(pgtable, iova, &pte_pgsize); + + if (!pte || !IOMMU_PTE_PRESENT(*pte)) + return 0; + + offset_mask = pte_pgsize - 1; + __pte = __sme_clr(*pte & PM_ADDR_MASK); + + return (__pte & ~offset_mask) | (iova & offset_mask); +} + /* * ---------------------------------------------------- */ @@ -528,6 +548,8 @@ static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *coo cfg->oas = IOMMU_OUT_ADDR_BIT_SIZE, cfg->tlb = &v1_flush_ops; + pgtable->iop.ops.iova_to_phys = iommu_v1_iova_to_phys; + return &pgtable->iop; } |