[PATCH 22/25] iommu/dma: Don't depend on CONFIG_DMA_DIRECT_REMAP

Christoph Hellwig
2019-04-30T10:52:11Z

For entirely dma coherent architectures there is no requirement to ever
remap dma coherent allocation. Move all the remap and pool code under
IS_ENABLED() checks and drop the Kconfig dependency.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/Kconfig | 1 -
drivers/iommu/dma-iommu.c | 16 +++++++++-------
2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index bdc14baf2ee5..6f07f3b21816 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -95,7 +95,6 @@ config IOMMU_DMA
select IOMMU_API
select IOMMU_IOVA
select NEED_SG_DMA_LENGTH
- depends on DMA_DIRECT_REMAP

config FSL_PAMU
bool "Freescale IOMMU support"
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 9ace9ad73e10..bbd475be567a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -923,10 +923,11 @@ static void __iommu_dma_free(struct device *dev, size_t size, void *cpu_addr)
struct page *page = NULL, **pages = NULL;

/* Non-coherent atomic allocation? Easy */
- if (dma_free_from_pool(cpu_addr, alloc_size))
+ if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
+ dma_free_from_pool(cpu_addr, alloc_size))
return;

- if (is_vmalloc_addr(cpu_addr)) {
+ if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
/*
* If it the address is remapped, then it's either non-coherent
* or highmem CMA, or an iommu_dma_alloc_remap() construction.
@@ -970,7 +971,7 @@ static void *iommu_dma_alloc_pages(struct device *dev, size_t size,
if (!page)
return NULL;

- if (!coherent || PageHighMem(page)) {
+ if (IS_ENABLED(CONFIG_DMA_REMAP) && (!coherent || PageHighMem(page))) {
pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);

cpu_addr = dma_common_contiguous_remap(page, alloc_size,
@@ -1003,11 +1004,12 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,

gfp |= __GFP_ZERO;

- if (gfpflags_allow_blocking(gfp) &&
+ if (IS_ENABLED(CONFIG_DMA_REMAP) && gfpflags_allow_blocking(gfp) &&
!(attrs & DMA_ATTR_FORCE_CONTIGUOUS))
return iommu_dma_alloc_remap(dev, size, handle, gfp, attrs);

- if (!gfpflags_allow_blocking(gfp) && !coherent)
+ if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
+ !gfpflags_allow_blocking(gfp) && !coherent)
cpu_addr = dma_alloc_from_pool(PAGE_ALIGN(size), &page, gfp);
else
cpu_addr = iommu_dma_alloc_pages(dev, size, &page, gfp, attrs);
@@ -1039,7 +1041,7 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
if (off >= nr_pages || vma_pages(vma) > nr_pages - off)
return -ENXIO;

- if (is_vmalloc_addr(cpu_addr)) {
+ if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
struct page **pages = __iommu_dma_get_pages(cpu_addr);

if (pages)
@@ -1061,7 +1063,7 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
struct page *page;
int ret;

- if (is_vmalloc_addr(cpu_addr)) {
+ if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
struct page **pages = __iommu_dma_get_pages(cpu_addr);

if (pages) {
--
2.20.1