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    Subject[PATCH AUTOSEL 5.15 03/39] powerpc/pseries/ddw: Revert "Extend upper limit for huge DMA window for persistent memory"
    Date
    From: Alexey Kardashevskiy <aik@ozlabs.ru>

    [ Upstream commit 2d33f5504490a9d90924476dbccd4a5349ee1ad0 ]

    This reverts commit 54fc3c681ded9437e4548e2501dc1136b23cfa9a
    which does not allow 1:1 mapping even for the system RAM which
    is usually possible.

    Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/20211108040320.3857636-2-aik@ozlabs.ru
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/powerpc/platforms/pseries/iommu.c | 9 ---------
    1 file changed, 9 deletions(-)

    diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
    index a52af8fbf5711..ad96d6e13d1f6 100644
    --- a/arch/powerpc/platforms/pseries/iommu.c
    +++ b/arch/powerpc/platforms/pseries/iommu.c
    @@ -1092,15 +1092,6 @@ static phys_addr_t ddw_memory_hotplug_max(void)
    phys_addr_t max_addr = memory_hotplug_max();
    struct device_node *memory;

    - /*
    - * The "ibm,pmemory" can appear anywhere in the address space.
    - * Assuming it is still backed by page structs, set the upper limit
    - * for the huge DMA window as MAX_PHYSMEM_BITS.
    - */
    - if (of_find_node_by_type(NULL, "ibm,pmemory"))
    - return (sizeof(phys_addr_t) * 8 <= MAX_PHYSMEM_BITS) ?
    - (phys_addr_t) -1 : (1ULL << MAX_PHYSMEM_BITS);
    -
    for_each_node_by_type(memory, "memory") {
    unsigned long start, size;
    int n_mem_addr_cells, n_mem_size_cells, len;
    --
    2.33.0
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