On Fri, May 01, 2020 at 07:39:47AM +0000, John Stultz wrote:
> This patch adds a dma_heap flag on the cma structure,
> along with accessors to set and read the flag.
>
> This is then used to process and store the "linux,cma-heap"
> property documented in the previous patch.
>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
> Cc: "Andrew F. Davis" <afd@xxxxxx>
> Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
> Cc: Liam Mark <lmark@xxxxxxxxxxxxxx>
> Cc: Pratik Patel <pratikp@xxxxxxxxxxxxxx>
> Cc: Laura Abbott <labbott@xxxxxxxxxx>
> Cc: Brian Starkey <Brian.Starkey@xxxxxxx>
> Cc: Chenbo Feng <fengc@xxxxxxxxxx>
> Cc: Alistair Strachan <astrachan@xxxxxxxxxx>
> Cc: Sandeep Patil <sspatil@xxxxxxxxxx>
> Cc: Hridya Valsaraju <hridya@xxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Cc: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: linux-mm@xxxxxxxxx
> Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
> ---
> include/linux/cma.h | 3 +++
> kernel/dma/contiguous.c | 3 +++
> mm/cma.c | 11 +++++++++++
> mm/cma.h | 1 +
> 4 files changed, 18 insertions(+)
>
> diff --git a/include/linux/cma.h b/include/linux/cma.h
> index 6ff79fefd01f..d8b8e6ce221c 100644
> --- a/include/linux/cma.h
> +++ b/include/linux/cma.h
> @@ -25,6 +25,9 @@ extern phys_addr_t cma_get_base(const struct cma *cma);
> extern unsigned long cma_get_size(const struct cma *cma);
> extern const char *cma_get_name(const struct cma *cma);
>
> +extern void __init cma_enable_dma_heap(struct cma *cma, bool enabled);
> +extern bool cma_dma_heap_enabled(struct cma *cma);
> +
> extern int __init cma_declare_contiguous_nid(phys_addr_t base,
> phys_addr_t size, phys_addr_t limit,
> phys_addr_t alignment, unsigned int order_per_bit,
> diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
> index 8bc6f2d670f9..f667fd51daa2 100644
> --- a/kernel/dma/contiguous.c
> +++ b/kernel/dma/contiguous.c
> @@ -303,6 +303,7 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem)
> phys_addr_t mask = align - 1;
> unsigned long node = rmem->fdt_node;
> bool default_cma = of_get_flat_dt_prop(node, "linux,cma-default", NULL);
> + bool heap_exported = of_get_flat_dt_prop(node, "linux,cma-heap", NULL);
> struct cma *cma;
> int err;
>
> @@ -332,6 +333,8 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem)
> if (default_cma)
> dma_contiguous_set_default(cma);
>
> + cma_enable_dma_heap(cma, heap_exported);
> +
> rmem->ops = &rmem_cma_ops;
> rmem->priv = cma;
>
> diff --git a/mm/cma.c b/mm/cma.c
> index 0463ad2ce06b..ec671bd8f66e 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -55,6 +55,16 @@ const char *cma_get_name(const struct cma *cma)
> return cma->name ? cma->name : "(undefined)";
> }
>
> +void __init cma_enable_dma_heap(struct cma *cma, bool enabled)
> +{
> + cma->dma_heap = enabled;
> +}
> +
> +bool cma_dma_heap_enabled(struct cma *cma)
> +{
> + return !!cma->dma_heap;
Stylistic thing, but I don't think the !! is really necessary. It's
already a bool anyway.
> +}
> +
> static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
> unsigned int align_order)
> {
> @@ -157,6 +167,7 @@ static int __init cma_init_reserved_areas(void)
> }
> core_initcall(cma_init_reserved_areas);
>
> +
nit: spurious newline
Cheers,
-Brian
> /**
> * cma_init_reserved_mem() - create custom contiguous area from reserved memory
> * @base: Base address of the reserved area
> diff --git a/mm/cma.h b/mm/cma.h
> index 33c0b517733c..6fe2242c724f 100644
> --- a/mm/cma.h
> +++ b/mm/cma.h
> @@ -13,6 +13,7 @@ struct cma {
> spinlock_t mem_head_lock;
> #endif
> const char *name;
> + bool dma_heap;
> };
>
> extern struct cma cma_areas[MAX_CMA_AREAS];
> --
> 2.17.1
>
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