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powerpc/pseries/ddw: Revert "Extend upper limit for huge DMA window for persistent memory"

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[ Upstream commit 2d33f5504490a9d90924476dbccd4a5349ee1ad0 ]

This reverts commit 54fc3c681d
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>
This commit is contained in:
Alexey Kardashevskiy 2021-11-08 15:03:17 +11:00 committed by Greg Kroah-Hartman
parent 7b2b7e03e8
commit 57e36973fa
1 changed files with 0 additions and 9 deletions
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arch/powerpc/platforms/pseries/iommu.c
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@ -1034,15 +1034,6 @@ 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;