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arm64: Limit the CMA buffer to 32-bit if ZONE_DMA 

When the CMA buffer is allocated, it is too early to know whether
devices will require ZONE_DMA memory. This patch limits the CMA buffer
to (DMA_BIT_MASK(32) + 1) if CONFIG_ZONE_DMA is enabled.

In addition, it computes the dma_to_phys(DMA_BIT_MASK(32)) before the
increment (no current functional change).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2014-06-13 13:41:20 +01:00
parent 1712ef43af
commit 2d5a5612bc
1 changed files with 8 additions and 2 deletions
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10
arch/arm64/mm/init.c
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@ -71,7 +71,7 @@ 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);
(unsigned long)(dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1);
max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT));
zone_size[ZONE_DMA] = max_dma - min;
}
@ -126,6 +126,8 @@ static void arm64_memory_present(void)
void __init arm64_memblock_init(void)
{
phys_addr_t dma_phys_limit = 0;
/* Register the kernel text, kernel data and initrd with memblock */
memblock_reserve(__pa(_text), _end - _text);
#ifdef CONFIG_BLK_DEV_INITRD
@ -141,7 +143,11 @@ void __init arm64_memblock_init(void)
memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE);
early_init_fdt_scan_reserved_mem();
dma_contiguous_reserve(0);
/* 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_contiguous_reserve(dma_phys_limit);
memblock_allow_resize();
memblock_dump_all();