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arm64: Increase the swiotlb buffer size 64MB 

With commit 3690951fc6 (arm64: Use swiotlb late initialisation), the
swiotlb buffer size is limited to MAX_ORDER_NR_PAGES. However, there are
platforms with 32-bit only devices that require bounce buffering via
swiotlb. This patch changes the swiotlb initialisation to an early 64MB
memblock allocation. In order to get the swiotlb buffer correctly
allocated (via memblock_virt_alloc_low_nopanic), this patch also defines
ARCH_LOW_ADDRESS_LIMIT to the maximum physical address capable of 32-bit
DMA.

Reported-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas 2015-02-05 18:01:53 +00:00
parent f6242cac10
commit a1e50a8225
3 changed files with 14 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/include/asm/processor.h
View File

@ -45,7 +45,8 @@
#define STACK_TOP STACK_TOP_MAX
#endif /* CONFIG_COMPAT */
#define ARCH_LOW_ADDRESS_LIMIT PHYS_MASK
extern phys_addr_t arm64_dma_phys_limit;
#define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
#endif /* __KERNEL__ */
struct debug_info {

16
arch/arm64/mm/dma-mapping.c
View File

@ -348,8 +348,6 @@ static struct dma_map_ops swiotlb_dma_ops = {
.mapping_error = swiotlb_dma_mapping_error,
};
extern int swiotlb_late_init_with_default_size(size_t default_size);
static int __init atomic_pool_init(void)
{
pgprot_t prot = __pgprot(PROT_NORMAL_NC);
@ -411,21 +409,13 @@ out:
return -ENOMEM;
}
static int __init swiotlb_late_init(void)
static int __init arm64_dma_init(void)
{
size_t swiotlb_size = min(SZ_64M, MAX_ORDER_NR_PAGES << PAGE_SHIFT);
int ret;
dma_ops = &swiotlb_dma_ops;
return swiotlb_late_init_with_default_size(swiotlb_size);
}
static int __init arm64_dma_init(void)
{
int ret = 0;
ret |= swiotlb_late_init();
ret |= atomic_pool_init();
ret = atomic_pool_init();
return ret;
}

14
arch/arm64/mm/init.c
View File

@ -33,6 +33,7 @@
#include <linux/dma-mapping.h>
#include <linux/dma-contiguous.h>
#include <linux/efi.h>
#include <linux/swiotlb.h>
#include <asm/fixmap.h>
#include <asm/memory.h>
@ -45,6 +46,7 @@
#include "mm.h"
phys_addr_t memstart_addr __read_mostly = 0;
phys_addr_t arm64_dma_phys_limit __read_mostly;
#ifdef CONFIG_BLK_DEV_INITRD
static int __init early_initrd(char *p)
@ -85,7 +87,7 @@ 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)) {
max_dma = PFN_DOWN(max_zone_dma_phys());
max_dma = PFN_DOWN(arm64_dma_phys_limit);
zone_size[ZONE_DMA] = max_dma - min;
}
zone_size[ZONE_NORMAL] = max - max_dma;
@ -156,8 +158,6 @@ early_param("mem", early_mem);
void __init arm64_memblock_init(void)
{
phys_addr_t dma_phys_limit = 0;
memblock_enforce_memory_limit(memory_limit);
/*
@ -174,8 +174,10 @@ void __init arm64_memblock_init(void)
/* 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);
arm64_dma_phys_limit = max_zone_dma_phys();
else
arm64_dma_phys_limit = PHYS_MASK + 1;
dma_contiguous_reserve(arm64_dma_phys_limit);
memblock_allow_resize();
memblock_dump_all();
@ -276,6 +278,8 @@ static void __init free_unused_memmap(void)
*/
void __init mem_init(void)
{
swiotlb_init(1);
set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
#ifndef CONFIG_SPARSEMEM_VMEMMAP