[PATCH master 4/4] ARM: mmu: invalidate when mapping range uncached

[Ahmad Fatoum]

memtest can call remap_range to map regions being tested as uncached,
but remap_range did not take care to evict any stale cache lines.
Do this now.

This fixes an issue of SELFTEST_MMU failing on an i.MX8MN, when running
memtest on an uncached region that was previously memtested while being
cached.

Fixes: 3100ea146688 ("ARM: rework MMU support")
Fixes: 7cc98fbb6128 ("arm: cpu: add basic arm64 mmu support")
Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
 arch/arm/cpu/mmu_32.c | 4 ++++
 arch/arm/cpu/mmu_64.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm/cpu/mmu_32.c b/arch/arm/cpu/mmu_32.c
index a324ebf71a55..c4e5a3bb0ab2 100644
--- a/arch/arm/cpu/mmu_32.c
+++ b/arch/arm/cpu/mmu_32.c
@@ -327,6 +327,10 @@ static void early_remap_range(u32 addr, size_t size, 
unsigned map_type)
 int arch_remap_range(void *virt_addr, phys_addr_t phys_addr, size_t size, 
unsigned map_type)
 {
        __arch_remap_range(virt_addr, phys_addr, size, map_type);
+
+       if (map_type == MAP_UNCACHED)
+               dma_inv_range(virt_addr, size);
+
        return 0;
 }
 
diff --git a/arch/arm/cpu/mmu_64.c b/arch/arm/cpu/mmu_64.c
index 940e0e914c43..63e70963224a 100644
--- a/arch/arm/cpu/mmu_64.c
+++ b/arch/arm/cpu/mmu_64.c
@@ -191,6 +191,10 @@ int arch_remap_range(void *virt_addr, phys_addr_t 
phys_addr, size_t size, unsign
                return -EINVAL;
 
        create_sections((uint64_t)virt_addr, phys_addr, (uint64_t)size, attrs);
+
+       if (flags == MAP_UNCACHED)
+               dma_inv_range(virt_addr, size);
+
        return 0;
 }
 
-- 
2.39.2