* [PATCH AUTOSEL 5.10 03/28] powerpc/pseries/ddw: Revert "Extend upper limit for huge DMA window for persistent memory"
[not found] <20211126023343.442045-1-sashal@kernel.org>
@ 2021-11-26 2:33 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-11-26 2:33 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Sasha Levin, leobras.c, Alexey Kardashevskiy, fbarrat,
linuxppc-dev
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 e4198700ed1a3..245f1f8df6563 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -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;
--
2.33.0
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