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powerpc/dart: Use a cachable DART

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Instead of punching a hole in the linear mapping, just use normal
cachable memory, and apply the flush sequence documented in the
CPC625 (aka U3) user manual.

This allows us to remove quite a bit of code related to the early
allocation of the DART and the hole in the linear mapping. We can
also get rid of the copy of the DART for suspend/resume as the
original memory can just be saved/restored now, as long as we
properly sync the caches.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[mpe: Integrate dart_init() fix to return ENODEV when DART disabled]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt
2016-07-05 15:03:47 +10:00
committed by Michael Ellerman
parent de4cf3de59
commit c40785ad30
5 changed files with 88 additions and 144 deletions
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7
arch/powerpc/platforms/maple/setup.c
View File

@@ -305,13 +305,6 @@ static int __init maple_probe(void)
if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
!of_flat_dt_is_compatible(root, "Momentum,Apache"))
return 0;
/*
* On U3, the DART (iommu) must be allocated now since it
* has an impact on htab_initialize (due to the large page it
* occupies having to be broken up so the DART itself is not
* part of the cacheable linar mapping
*/
alloc_dart_table();
hpte_init_native();
pm_power_off = maple_power_off;

8
arch/powerpc/platforms/powermac/setup.c
View File

@@ -607,14 +607,6 @@ static int __init pmac_probe(void)
return 0;
#ifdef CONFIG_PPC64
/*
* On U3, the DART (iommu) must be allocated now since it
* has an impact on htab_initialize (due to the large page it
* occupies having to be broken up so the DART itself is not
* part of the cacheable linar mapping
*/
alloc_dart_table();
hpte_init_native();
#endif