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d50314a6b0
linux/arch/arm64/mm
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Catalin Marinas d50314a6b0 arm64: Create non-empty ZONE_DMA when DRAM starts above 4GB 
ZONE_DMA is created to allow 32-bit only devices to access memory in the
absence of an IOMMU. On systems where the memory starts above 4GB, it is
expected that some devices have a DMA offset hardwired to be able to
access the bottom of the memory. Linux currently supports DT bindings
for the DMA offsets but they are not (easily) available early during
boot.

This patch tries to guess a DMA offset and assumes that ZONE_DMA
corresponds to the 32-bit mask above the start of DRAM.

Fixes: 2d5a5612bc (arm64: Limit the CMA buffer to 32-bit if ZONE_DMA)
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Mark Salter <msalter@redhat.com>
Tested-by: Mark Salter <msalter@redhat.com>
Tested-by: Anup Patel <anup.patel@linaro.org>
2014-07-23 11:23:58 +01:00
..
cache.S arm64: mm: use inner-shareable barriers for inner-shareable maintenance 2014-05-09 17:21:24 +01:00
context.c arm64: Process management 2012-09-17 13:41:58 +01:00
copypage.c arm64: export __cpu_{clear,copy}_user_page functions 2014-07-08 17:30:51 +01:00
dma-mapping.c arm64: Clean up the default pgprot setting 2014-05-09 15:53:37 +01:00
extable.c arm64: MMU fault handling and page table management 2012-09-17 13:41:57 +01:00
fault.c Revert "arm64: Introduce execute-only page access permissions" 2014-05-16 16:44:32 +01:00
flush.c arm64: mm: Make icache synchronisation logic huge page aware 2014-07-04 14:26:01 +01:00
hugetlbpage.c hugetlb: restrict hugepage_migration_support() to x86_64 2014-06-04 16:53:51 -07:00
init.c arm64: Create non-empty ZONE_DMA when DRAM starts above 4GB 2014-07-23 11:23:58 +01:00
ioremap.c arm64: add early_ioremap support 2014-04-07 16:36:15 -07:00
Makefile arm64: mm: Optimise tlb flush logic where we have >4K granule 2014-05-09 17:00:48 +01:00
mm.h arm64: Remove __flush_dcache_page() 2013-06-07 17:58:30 +01:00
mmap.c mm: remove free_area_cache 2013-07-10 18:11:34 -07:00
mmu.c - Optimised assembly string/memory routines (based on the AArch64 Cortex 2014-06-06 10:43:28 -07:00
pgd.c arm64: simplify pgd_alloc 2014-02-05 10:45:07 +00:00
proc-macros.S arm64: mm: use ubfm for dcache_line_size 2014-01-22 16:23:58 +00:00
proc.S arm64: mm: use inner-shareable barriers for inner-shareable maintenance 2014-05-09 17:21:24 +01:00