- return swiotlb_dma_mapping_error(hwdev, addr);
+ return dma_direct_mapping_error(hwdev, addr);
return 0;
}
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 88f3963ca30f..5fc335f4d9cd 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -11,7 +11,7 @@
*
*/
-#include <linux/dma-mapping.h>
+#include <linux/dma-direct.h>
#include <linux/memblock.h>
#include <linux/pfn.h>
#include <linux/of_platform.h>
@@ -59,7 +59,7 @@ const struct dma_map_ops powerpc_swiotlb_dma_ops = {
.sync_single_for_device = swiotlb_sync_single_for_device,
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = swiotlb_sync_sg_for_device,
- .mapping_error = swiotlb_dma_mapping_error,
+ .mapping_error = dma_direct_mapping_error,
.get_required_mask = swiotlb_powerpc_get_required,
};
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index fbca184ff5a0..bd73e7a91410 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -5,6 +5,8 @@
#include <linux/dma-mapping.h>
#include <linux/mem_encrypt.h>
+#define DIRECT_MAPPING_ERROR 0
+
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
#include <asm/dma-direct.h>
#else
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 7ef541ce8f34..f847c1b265c4 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -106,9 +106,6 @@ extern void
swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
int nelems, enum dma_data_direction dir);
-extern int
-swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
-
extern int
swiotlb_dma_supported(struct device *hwdev, u64 mask);
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 674a8da22844..12798abba55e 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -14,8 +14,6 @@
#include <linux/pfn.h>
#include <linux/set_memory.h>
-#define DIRECT_MAPPING_ERROR 0
-
/*
* Most architectures use ZONE_DMA for the first 16 Megabytes, but
* some use it for entirely different regions:
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 69bf305ee5f8..11dbcd80b4a6 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -72,13 +72,6 @@ static phys_addr_t io_tlb_start, io_tlb_end;
*/
static unsigned long io_tlb_nslabs;
-/*
- * When the IOMMU overflows we return a fallback buffer. This sets the size.
- */
-static unsigned long io_tlb_overflow = 32*1024;
-
-static phys_addr_t io_tlb_overflow_buffer;
-
/*
* This is a free list describing the number of free entries available from
* each index
@@ -126,7 +119,6 @@ setup_io_tlb_npages(char *str)
return 0;
}
early_param("swiotlb", setup_io_tlb_npages);
-/* make io_tlb_overflow tunable too? */
unsigned long swiotlb_nr_tbl(void)
{
@@ -194,16 +186,10 @@ void __init swiotlb_update_mem_attributes(void)
bytes = PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT);
set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
memset(vaddr, 0, bytes);
-
- vaddr = phys_to_virt(io_tlb_overflow_buffer);
- bytes = PAGE_ALIGN(io_tlb_overflow);
- set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
- memset(vaddr, 0, bytes);
}
int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
{
- void *v_overflow_buffer;
unsigned long i, bytes;
bytes = nslabs << IO_TLB_SHIFT;
@@ -212,17 +198,6 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long
nslabs, int verbose)
io_tlb_start = __pa(tlb);
io_tlb_end = io_tlb_start + bytes;
- /*
- * Get the overflow emergency buffer
- */
- v_overflow_buffer = memblock_virt_alloc_low_nopanic(
- PAGE_ALIGN(io_tlb_overflow),
- PAGE_SIZE);
- if (!v_overflow_buffer)
- return -ENOMEM;
-
- io_tlb_overflow_buffer = __pa(v_overflow_buffer);
-
/*
* Allocate and initialize the free list array. This array is used
* to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
@@ -330,7 +305,6 @@ int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
unsigned long i, bytes;
- unsigned char *v_overflow_buffer;
bytes = nslabs << IO_TLB_SHIFT;
@@ -341,19 +315,6 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
memset(tlb, 0, bytes);
- /*
- * Get the overflow emergency buffer
- */
- v_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
-
get_order(io_tlb_overflow));
- if (!v_overflow_buffer)
- goto cleanup2;
-
- set_memory_decrypted((unsigned long)v_overflow_buffer,
- io_tlb_overflow >> PAGE_SHIFT);
- memset(v_overflow_buffer, 0, io_tlb_overflow);
- io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer);
-
/*
* Allocate and initialize the free list array. This array is used
* to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
@@ -390,10 +351,6 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
sizeof(int)));
io_tlb_list = NULL;
cleanup3:
- free_pages((unsigned long)v_overflow_buffer,
- get_order(io_tlb_overflow));
- io_tlb_overflow_buffer = 0;
-cleanup2:
io_tlb_end = 0;
io_tlb_start = 0;
io_tlb_nslabs = 0;
@@ -407,8 +364,6 @@ void __init swiotlb_exit(void)
return;
if (late_alloc) {
- free_pages((unsigned long)phys_to_virt(io_tlb_overflow_buffer),
- get_order(io_tlb_overflow));
free_pages((unsigned long)io_tlb_orig_addr,
get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
@@ -416,8 +371,6 @@ void __init swiotlb_exit(void)
free_pages((unsigned long)phys_to_virt(io_tlb_start),
get_order(io_tlb_nslabs << IO_TLB_SHIFT));
} else {
- memblock_free_late(io_tlb_overflow_buffer,
- PAGE_ALIGN(io_tlb_overflow));
memblock_free_late(__pa(io_tlb_orig_addr),
PAGE_ALIGN(io_tlb_nslabs *
sizeof(phys_addr_t)));
memblock_free_late(__pa(io_tlb_list),
@@ -790,7 +743,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page
*page,
/* Oh well, have to allocate and map a bounce buffer. */
map = map_single(dev, phys, size, dir, attrs);
if (map == SWIOTLB_MAP_ERROR)
- return __phys_to_dma(dev, io_tlb_overflow_buffer);
+ return DIRECT_MAPPING_ERROR;
dev_addr = __phys_to_dma(dev, map);
@@ -801,7 +754,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
- return __phys_to_dma(dev, io_tlb_overflow_buffer);
+ return DIRECT_MAPPING_ERROR;
}
/*
@@ -985,12 +938,6 @@ swiotlb_sync_sg_for_device(struct device *hwdev, struct
scatterlist *sg,
swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
}
-int
-swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
-{
- return (dma_addr == __phys_to_dma(hwdev, io_tlb_overflow_buffer));
-}
-
/*
* Return whether the given device DMA address mask can be supported
* properly. For example, if your device can only drive the low 24-bits
@@ -1033,7 +980,7 @@ void swiotlb_free(struct device *dev, size_t size, void
*vaddr,
}
const struct dma_map_ops swiotlb_dma_ops = {
- .mapping_error = swiotlb_dma_mapping_error,
+ .mapping_error = dma_direct_mapping_error,
.alloc = swiotlb_alloc,
.free = swiotlb_free,
.sync_single_for_cpu = swiotlb_sync_single_for_cpu,