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authorLinus Torvalds <torvalds@linux-foundation.org>2014-07-23 17:47:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-07-23 17:47:36 -0700
commit98de5ab7138bdb78ba1cf50978201a4c21bdb111 (patch)
tree023a82b35f7841c37b6b7559bfcabfd8fa202357 /arch/arm64
parent29ae8a6a281445ae5fe69287cf1165326978b1c7 (diff)
parentd50314a6b0702c630c35b88148c1acb76d2e4ede (diff)
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fix from Catalin Marinas: "Fix arm64 regression introduced by limiting the CMA buffer to ZONE_DMA on platforms where RAM starts above 4GB (and ZONE_DMA becoming 0)" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: Create non-empty ZONE_DMA when DRAM starts above 4GB
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/mm/init.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index f43db8a69262..e90c5426fe14 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -60,6 +60,17 @@ static int __init early_initrd(char *p)
early_param("initrd", early_initrd);
#endif
+/*
+ * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
+ * currently assumes that for memory starting above 4G, 32-bit devices will
+ * use a DMA offset.
+ */
+static phys_addr_t max_zone_dma_phys(void)
+{
+ phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
+ return min(offset + (1ULL << 32), memblock_end_of_DRAM());
+}
+
static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
struct memblock_region *reg;
@@ -70,9 +81,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
/* 4GB maximum for 32-bit only capable devices */
if (IS_ENABLED(CONFIG_ZONE_DMA)) {
- unsigned long max_dma_phys =
- (unsigned long)(dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1);
- max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT));
+ max_dma = PFN_DOWN(max_zone_dma_phys());
zone_size[ZONE_DMA] = max_dma - min;
}
zone_size[ZONE_NORMAL] = max - max_dma;
@@ -146,7 +155,7 @@ void __init arm64_memblock_init(void)
/* 4GB maximum for 32-bit only capable devices */
if (IS_ENABLED(CONFIG_ZONE_DMA))
- dma_phys_limit = dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1;
+ dma_phys_limit = max_zone_dma_phys();
dma_contiguous_reserve(dma_phys_limit);
memblock_allow_resize();