Commit 2d33f550 authored by Alexey Kardashevskiy's avatar Alexey Kardashevskiy Committed by Michael Ellerman
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powerpc/pseries/ddw: Revert "Extend upper limit for huge DMA window for persistent memory" 



This reverts commit 54fc3c68
which does not allow 1:1 mapping even for the system RAM which
is usually possible.

Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211108040320.3857636-2-aik@ozlabs.ru
parent 30203946

arch/powerpc/platforms/pseries/iommu.c

+0 −9
Original line number Diff line number Diff line
@@ -1094,15 +1094,6 @@ 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;