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WIP: iommu/io-pgtable-arm: Fix coherency support for Mali LPAE

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Mali T628r0p1 which may be found in Samsung Exynos 5422 SOC is
definitely not dma coherent, and it is not happy with PTE_SH_OS bit set
by default in commit 728da60da7 ("iommu/io-pgtable-arm: Support
coherency for Mali LPAE"). Use PTE_SH_IS by default for non dma
coherent Mali GPUs.

Signed-off-by: Pavel Golikov <Paullo612@ya.ru>
This commit is contained in:
Pavel Golikov
2022-06-24 15:54:16 +00:00
committed by Mauro (mdrjr) Ribeiro
parent 29c910ca35
commit 6ba8d4547e
1 changed files with 3 additions and 2 deletions
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5
drivers/iommu/io-pgtable-arm.c
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@@ -444,9 +444,10 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
* "outside the GPU" (i.e. either the Inner or System domain in CPU
* terms, depending on coherency).
*/
if (prot & IOMMU_CACHE && data->iop.fmt != ARM_MALI_LPAE)
if (prot & IOMMU_CACHE ||
(data->iop.fmt == ARM_MALI_LPAE && !data->iop.cfg.coherent_walk))
pte |= ARM_LPAE_PTE_SH_IS;
else
else if (data->iop.fmt == ARM_MALI_LPAE)
pte |= ARM_LPAE_PTE_SH_OS;
if (prot & IOMMU_NOEXEC)