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net: ipa: fix table alignment requirement

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[ Upstream commit e5d4e96b44cf20330c970c3e30ea0a8c3a23feca ]

We currently have a build-time check to ensure that the minimum DMA
allocation alignment satisfies the constraint that IPA filter and
route tables must point to rules that are 128-byte aligned.

But what's really important is that the actual allocated DMA memory
has that alignment, even if the minimum is smaller than that.

Remove the BUILD_BUG_ON() call checking against minimim DMA alignment
and instead verify at rutime that the allocated memory is properly
aligned.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: cf412ec33325 ("net: ipa: properly limit modem routing table use")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Elder
2021-03-18 13:59:29 -05:00
committed by Greg Kroah-Hartman
parent c2cf0613d1
commit 3ae25aca3f
1 changed files with 12 additions and 8 deletions
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20
drivers/net/ipa/ipa_table.c
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@@ -118,14 +118,6 @@
/* Check things that can be validated at build time. */
static void ipa_table_validate_build(void)
{
/* IPA hardware accesses memory 128 bytes at a time. Addresses
* referred to by entries in filter and route tables must be
* aligned on 128-byte byte boundaries. The only rule address
* ever use is the "zero rule", and it's aligned at the base
* of a coherent DMA allocation.
*/
BUILD_BUG_ON(ARCH_DMA_MINALIGN % IPA_TABLE_ALIGN);
/* Filter and route tables contain DMA addresses that refer
* to filter or route rules. But the size of a table entry
* is 64 bits regardless of what the size of an AP DMA address
@@ -669,6 +661,18 @@ int ipa_table_init(struct ipa *ipa)
if (!virt)
return -ENOMEM;
/* We put the "zero rule" at the base of our table area. The IPA
* hardware requires rules to be aligned on a 128-byte boundary.
* Make sure the allocation satisfies this constraint.
*/
if (addr % IPA_TABLE_ALIGN) {
dev_err(dev, "table address %pad not %u-byte aligned\n",
&addr, IPA_TABLE_ALIGN);
dma_free_coherent(dev, size, virt, addr);
return -ERANGE;
}
ipa->table_virt = virt;
ipa->table_addr = addr;