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    Subject[PATCH 4.18 115/197] iommu/omap: Fix cache flushes on L2 table entries
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ralf Goebel <ralf.goebel@imago-technologies.com>

    [ Upstream commit 04c532a1cdc7e423656c07937aa4b5c1c2b064f9 ]

    The base address used for DMA operations on the second-level table
    did incorrectly include the offset for the table entry. The offset
    was then added again which lead to incorrect behavior.

    Operations on the L1 table are not affected.

    The calculation of the base address is changed to point to the
    beginning of the L2 table.

    Fixes: bfee0cf0ee1d ("iommu/omap: Use DMA-API for performing cache flushes")
    Acked-by: Suman Anna <s-anna@ti.com>
    Signed-off-by: Ralf Goebel <ralf.goebel@imago-technologies.com>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/iommu/omap-iommu.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/drivers/iommu/omap-iommu.c
    +++ b/drivers/iommu/omap-iommu.c
    @@ -550,7 +550,7 @@ static u32 *iopte_alloc(struct omap_iomm

    pte_ready:
    iopte = iopte_offset(iopgd, da);
    - *pt_dma = virt_to_phys(iopte);
    + *pt_dma = iopgd_page_paddr(iopgd);
    dev_vdbg(obj->dev,
    "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
    __func__, da, iopgd, *iopgd, iopte, *iopte);
    @@ -738,7 +738,7 @@ static size_t iopgtable_clear_entry_core
    }
    bytes *= nent;
    memset(iopte, 0, nent * sizeof(*iopte));
    - pt_dma = virt_to_phys(iopte);
    + pt_dma = iopgd_page_paddr(iopgd);
    flush_iopte_range(obj->dev, pt_dma, pt_offset, nent);

    /*

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