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Subject[PATCH 2/2] dma: remove unsupported gfp_mask parameter from dma_alloc_from_contiguous()
Date
The CMA memory allocator doesn't support standard gfp flags for memory
allocation, so there is no point having it as a parameter for
dma_alloc_from_contiguous() function. Replace it by a boolean no_warn
argument, which covers all the underlaying cma_alloc() function supports.

This will help to avoid giving false feeling that this function supports
standard gfp flags and callers can pass __GFP_ZERO to get zeroed buffer,
what has already been an issue: see commit dd65a941f6ba ("arm64:
dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag").

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
arch/arm/mm/dma-mapping.c | 5 +++--
arch/arm64/mm/dma-mapping.c | 4 ++--
arch/xtensa/kernel/pci-dma.c | 2 +-
drivers/iommu/amd_iommu.c | 2 +-
drivers/iommu/intel-iommu.c | 3 ++-
include/linux/dma-contiguous.h | 4 ++--
kernel/dma/contiguous.c | 7 +++----
kernel/dma/direct.c | 3 ++-
8 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index be0fa7e39c26..121c6c3ba9e0 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -594,7 +594,7 @@ static void *__alloc_from_contiguous(struct device *dev, size_t size,
struct page *page;
void *ptr = NULL;

- page = dma_alloc_from_contiguous(dev, count, order, gfp);
+ page = dma_alloc_from_contiguous(dev, count, order, gfp & __GFP_NOWARN);
if (!page)
return NULL;

@@ -1294,7 +1294,8 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
unsigned long order = get_order(size);
struct page *page;

- page = dma_alloc_from_contiguous(dev, count, order, gfp);
+ page = dma_alloc_from_contiguous(dev, count, order,
+ gfp & __GFP_NOWARN);
if (!page)
goto error;

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 61e93f0b5482..072c51fb07d7 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -355,7 +355,7 @@ static int __init atomic_pool_init(void)

if (dev_get_cma_area(NULL))
page = dma_alloc_from_contiguous(NULL, nr_pages,
- pool_size_order, GFP_KERNEL);
+ pool_size_order, false);
else
page = alloc_pages(GFP_DMA32, pool_size_order);

@@ -573,7 +573,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
struct page *page;

page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
- get_order(size), gfp);
+ get_order(size), gfp & __GFP_NOWARN);
if (!page)
return NULL;

diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c
index ba4640cc0093..b2c7ba91fb08 100644
--- a/arch/xtensa/kernel/pci-dma.c
+++ b/arch/xtensa/kernel/pci-dma.c
@@ -137,7 +137,7 @@ static void *xtensa_dma_alloc(struct device *dev, size_t size,

if (gfpflags_allow_blocking(flag))
page = dma_alloc_from_contiguous(dev, count, get_order(size),
- flag);
+ flag & __GFP_NOWARN);

if (!page)
page = alloc_pages(flag, get_order(size));
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 64cfe854e0f5..5ec97ffb561a 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2622,7 +2622,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
return NULL;

page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
- get_order(size), flag);
+ get_order(size), flag & __GFP_NOWARN);
if (!page)
return NULL;
}
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 869321c594e2..dd2d343428ab 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3746,7 +3746,8 @@ static void *intel_alloc_coherent(struct device *dev, size_t size,
if (gfpflags_allow_blocking(flags)) {
unsigned int count = size >> PAGE_SHIFT;

- page = dma_alloc_from_contiguous(dev, count, order, flags);
+ page = dma_alloc_from_contiguous(dev, count, order,
+ flags & __GFP_NOWARN);
if (page && iommu_no_mapping(dev) &&
page_to_phys(page) + size > dev->coherent_dma_mask) {
dma_release_from_contiguous(dev, page, count);
diff --git a/include/linux/dma-contiguous.h b/include/linux/dma-contiguous.h
index 3c5a4cb3eb95..f247e8aa5e3d 100644
--- a/include/linux/dma-contiguous.h
+++ b/include/linux/dma-contiguous.h
@@ -112,7 +112,7 @@ static inline int dma_declare_contiguous(struct device *dev, phys_addr_t size,
}

struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
- unsigned int order, gfp_t gfp_mask);
+ unsigned int order, bool no_warn);
bool dma_release_from_contiguous(struct device *dev, struct page *pages,
int count);

@@ -145,7 +145,7 @@ int dma_declare_contiguous(struct device *dev, phys_addr_t size,

static inline
struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
- unsigned int order, gfp_t gfp_mask)
+ unsigned int order, bool no_warn)
{
return NULL;
}
diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index 19ea5d70150c..286d82329eb0 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -178,7 +178,7 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
* @dev: Pointer to device for which the allocation is performed.
* @count: Requested number of pages.
* @align: Requested alignment of pages (in PAGE_SIZE order).
- * @gfp_mask: GFP flags to use for this allocation.
+ * @no_warn: Avoid printing message about failed allocation.
*
* This function allocates memory buffer for specified device. It uses
* device specific contiguous memory area if available or the default
@@ -186,13 +186,12 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
* function.
*/
struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
- unsigned int align, gfp_t gfp_mask)
+ unsigned int align, bool no_warn)
{
if (align > CONFIG_CMA_ALIGNMENT)
align = CONFIG_CMA_ALIGNMENT;

- return cma_alloc(dev_get_cma_area(dev), count, align,
- gfp_mask & __GFP_NOWARN);
+ return cma_alloc(dev_get_cma_area(dev), count, align, no_warn);
}

/**
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 8be8106270c2..e0241beeb645 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -78,7 +78,8 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
again:
/* CMA can be used only in the context which permits sleeping */
if (gfpflags_allow_blocking(gfp)) {
- page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
+ page = dma_alloc_from_contiguous(dev, count, page_order,
+ gfp & __GFP_NOWARN);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
dma_release_from_contiguous(dev, page, count);
page = NULL;
--
2.17.1
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