[PATCH 5.11 14/31] swiotlb: add a IO_TLB_SIZE define

Greg Kroah-Hartman
2021-05-05T12:11:20Z

From: Jianxiong Gao <jxgao@google.com>

commit: b5d7ccb7aac3895c2138fe0980a109116ce15eff

Add a new IO_TLB_SIZE define instead open coding it using
IO_TLB_SHIFT all over.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jianxiong Gao <jxgao@google.com>
Tested-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jianxiong Gao <jxgao@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/linux/swiotlb.h | 1 +
kernel/dma/swiotlb.c | 12 ++++++------
2 files changed, 7 insertions(+), 6 deletions(-)

--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -29,6 +29,7 @@ enum swiotlb_force {
* controllable.
*/
#define IO_TLB_SHIFT 11
+#define IO_TLB_SIZE (1 << IO_TLB_SHIFT)

/* default to 64MB */
#define IO_TLB_DEFAULT_SIZE (64UL<<20)
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -491,20 +491,20 @@ phys_addr_t swiotlb_tbl_map_single(struc

tbl_dma_addr &= mask;

- offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+ offset_slots = ALIGN(tbl_dma_addr, IO_TLB_SIZE) >> IO_TLB_SHIFT;

/*
* Carefully handle integer overflow which can occur when mask == ~0UL.
*/
max_slots = mask + 1
- ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
+ ? ALIGN(mask + 1, IO_TLB_SIZE) >> IO_TLB_SHIFT
: 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);

/*
* For mappings greater than or equal to a page, we limit the stride
* (and hence alignment) to a page size.
*/
- nslots = ALIGN(alloc_size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+ nslots = ALIGN(alloc_size, IO_TLB_SIZE) >> IO_TLB_SHIFT;
if (alloc_size >= PAGE_SIZE)
stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
else
@@ -598,7 +598,7 @@ void swiotlb_tbl_unmap_single(struct dev
enum dma_data_direction dir, unsigned long attrs)
{
unsigned long flags;
- int i, count, nslots = ALIGN(alloc_size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
+ int i, count, nslots = ALIGN(alloc_size, IO_TLB_SIZE) >> IO_TLB_SHIFT;
int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
phys_addr_t orig_addr = io_tlb_orig_addr[index];

@@ -649,7 +649,7 @@ void swiotlb_tbl_sync_single(struct devi

if (orig_addr == INVALID_PHYS_ADDR)
return;
- orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
+ orig_addr += (unsigned long)tlb_addr & (IO_TLB_SIZE - 1);

switch (target) {
case SYNC_FOR_CPU:
@@ -707,7 +707,7 @@ dma_addr_t swiotlb_map(struct device *de

size_t swiotlb_max_mapping_size(struct device *dev)
{
- return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE;
+ return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE;
}

bool is_swiotlb_active(void)