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dma: contiguous: Make dev_get_cma_area() a proper function

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As we try to enable dma-buf heaps, and the CMA one in particular, to
compile as modules, we need to export dev_get_cma_area(). It's currently
implemented as an inline function that returns either the content of
device->cma_area or dma_contiguous_default_area.

Thus, it means we need to export dma_contiguous_default_area, which
isn't really something we want any module to have access to.

Instead, let's make dev_get_cma_area() a proper function we will be able
to export so we can avoid exporting dma_contiguous_default_area.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260331-dma-buf-heaps-as-modules-v4-2-e18fda504419@kernel.org
This commit is contained in:
Maxime Ripard
2026-03-31 12:00:11 +02:00
committed by Marek Szyprowski
parent 25bd735629
commit b3707be95f
2 changed files with 9 additions and 6 deletions
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7
include/linux/dma-map-ops.h
View File

@@ -93,12 +93,7 @@ static inline void set_dma_ops(struct device *dev,
#ifdef CONFIG_DMA_CMA
extern struct cma *dma_contiguous_default_area;
static inline struct cma *dev_get_cma_area(struct device *dev)
{
if (dev && dev->cma_area)
return dev->cma_area;
return dma_contiguous_default_area;
}
struct cma *dev_get_cma_area(struct device *dev);
struct cma *dma_contiguous_get_area_by_idx(unsigned int idx);
void dma_contiguous_reserve(phys_addr_t addr_limit);

8
kernel/dma/contiguous.c
View File

@@ -131,6 +131,14 @@ bool __init cma_skip_dt_default_reserved_mem(void)
return size_cmdline != -1;
}
struct cma *dev_get_cma_area(struct device *dev)
{
if (dev && dev->cma_area)
return dev->cma_area;
return dma_contiguous_default_area;
}
#ifdef CONFIG_DMA_NUMA_CMA
static struct cma *dma_contiguous_numa_area[MAX_NUMNODES];