diff options
| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2020-10-31 14:01:12 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-11-20 17:58:18 -0800 |
| commit | da815582cf4594e96defa1cddb72cd00b1e7aac5 (patch) | |
| tree | 2ec70322eea726d2523c1158bc7da8cbf7013758 /arch/riscv/mm | |
| parent | ae386e9d809c6c7990c5414ea9ae035731ca0f81 (diff) | |
riscv: Enable CMA support
riscv has selected HAVE_DMA_CONTIGUOUS, but doesn't call
dma_contiguous_reserve(). This calls dma_contiguous_reserve(), which
enables CMA.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/mm')
| -rw-r--r-- | arch/riscv/mm/init.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index e3c1fc4d5d03..563dbb13efe3 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -13,6 +13,7 @@ #include <linux/of_fdt.h> #include <linux/libfdt.h> #include <linux/set_memory.h> +#include <linux/dma-map-ops.h> #include <asm/fixmap.h> #include <asm/tlbflush.h> @@ -41,13 +42,14 @@ struct pt_alloc_ops { #endif }; +static phys_addr_t dma32_phys_limit __ro_after_init; + static void __init zone_sizes_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; #ifdef CONFIG_ZONE_DMA32 - max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, - (unsigned long) PFN_PHYS(max_low_pfn))); + max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); #endif max_zone_pfns[ZONE_NORMAL] = max_low_pfn; @@ -185,6 +187,7 @@ void __init setup_bootmem(void) max_pfn = PFN_DOWN(memblock_end_of_DRAM()); max_low_pfn = max_pfn; + dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); set_max_mapnr(max_low_pfn); #ifdef CONFIG_BLK_DEV_INITRD @@ -198,6 +201,7 @@ void __init setup_bootmem(void) memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); early_init_fdt_scan_reserved_mem(); + dma_contiguous_reserve(dma32_phys_limit); memblock_allow_resize(); memblock_dump_all(); } |