diff options
Diffstat (limited to 'arch/arm64/mm/init.c')
| -rw-r--r-- | arch/arm64/mm/init.c | 64 |
1 files changed, 38 insertions, 26 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index f497ca77925a..d0f86b74fce6 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -30,6 +30,8 @@ #include <linux/memblock.h> #include <linux/sort.h> #include <linux/of_fdt.h> +#include <linux/dma-mapping.h> +#include <linux/dma-contiguous.h> #include <asm/prom.h> #include <asm/sections.h> @@ -44,8 +46,7 @@ static unsigned long phys_initrd_size __initdata = 0; phys_addr_t memstart_addr __read_mostly = 0; -void __init early_init_dt_setup_initrd_arch(unsigned long start, - unsigned long end) +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end) { phys_initrd_start = start; phys_initrd_size = end - start; @@ -67,22 +68,31 @@ static int __init early_initrd(char *p) } early_param("initrd", early_initrd); -#define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT) +/* + * 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; unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; - unsigned long max_dma32 = min; + unsigned long max_dma = min; memset(zone_size, 0, sizeof(zone_size)); -#ifdef CONFIG_ZONE_DMA32 /* 4GB maximum for 32-bit only capable devices */ - max_dma32 = max(min, min(max, MAX_DMA32_PFN)); - zone_size[ZONE_DMA32] = max_dma32 - min; -#endif - zone_size[ZONE_NORMAL] = max - max_dma32; + if (IS_ENABLED(CONFIG_ZONE_DMA)) { + max_dma = PFN_DOWN(max_zone_dma_phys()); + zone_size[ZONE_DMA] = max_dma - min; + } + zone_size[ZONE_NORMAL] = max - max_dma; memcpy(zhole_size, zone_size, sizeof(zhole_size)); @@ -92,15 +102,15 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max) if (start >= max) continue; -#ifdef CONFIG_ZONE_DMA32 - if (start < max_dma32) { - unsigned long dma_end = min(end, max_dma32); - zhole_size[ZONE_DMA32] -= dma_end - start; + + if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { + unsigned long dma_end = min(end, max_dma); + zhole_size[ZONE_DMA] -= dma_end - start; } -#endif - if (end > max_dma32) { + + if (end > max_dma) { unsigned long normal_end = min(end, max); - unsigned long normal_start = max(start, max_dma32); + unsigned long normal_start = max(start, max_dma); zhole_size[ZONE_NORMAL] -= normal_end - normal_start; } } @@ -134,8 +144,12 @@ static void arm64_memory_present(void) void __init arm64_memblock_init(void) { u64 *reserve_map, base, size; + phys_addr_t dma_phys_limit = 0; - /* Register the kernel text, kernel data and initrd with memblock */ + /* + * Register the kernel text, kernel data, initrd, and initial + * pagetables with memblock. + */ memblock_reserve(__pa(_text), _end - _text); #ifdef CONFIG_BLK_DEV_INITRD if (phys_initrd_size) { @@ -147,13 +161,6 @@ void __init arm64_memblock_init(void) } #endif - /* - * Reserve the page tables. These are already in use, - * and can only be in node 0. - */ - memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); - memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); - /* Reserve the dtb region */ memblock_reserve(virt_to_phys(initial_boot_params), be32_to_cpu(initial_boot_params->totalsize)); @@ -173,6 +180,13 @@ void __init arm64_memblock_init(void) memblock_reserve(base, size); } + early_init_fdt_scan_reserved_mem(); + + /* 4GB maximum for 32-bit only capable devices */ + if (IS_ENABLED(CONFIG_ZONE_DMA)) + dma_phys_limit = max_zone_dma_phys(); + dma_contiguous_reserve(dma_phys_limit); + memblock_allow_resize(); memblock_dump_all(); } @@ -283,8 +297,6 @@ void __init mem_init(void) unsigned long reserved_pages, free_pages; struct memblock_region *reg; - arm64_swiotlb_init(); - max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; #ifndef CONFIG_SPARSEMEM_VMEMMAP |