diff mbox series

[08/12] dma-direct: warn when coherent allocations aren't supported

Message ID 20231016054755.915155-9-hch@lst.de (mailing list archive)
State Superseded
Headers show
Series [01/12] riscv: RISCV_NONSTANDARD_CACHE_OPS shouldn't depend on RISCV_DMA_NONCOHERENT | expand

Checks

Context Check Description
conchuod/vmtest-fixes-PR fail merge-conflict

Commit Message

Christoph Hellwig Oct. 16, 2023, 5:47 a.m. UTC
Log a warning once when dma_alloc_coherent fails because the platform
does not support coherent allocations at all.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 kernel/dma/direct.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Comments

Robin Murphy Oct. 16, 2023, 11:59 a.m. UTC | #1
On 16/10/2023 6:47 am, Christoph Hellwig wrote:
> Log a warning once when dma_alloc_coherent fails because the platform
> does not support coherent allocations at all.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>   kernel/dma/direct.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
> index 1327d04fa32a25..fddfea3b2fe173 100644
> --- a/kernel/dma/direct.c
> +++ b/kernel/dma/direct.c
> @@ -240,8 +240,10 @@ void *dma_direct_alloc(struct device *dev, size_t size,
>   		 */
>   		set_uncached = IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED);
>   		remap = IS_ENABLED(CONFIG_DMA_DIRECT_REMAP);
> -		if (!set_uncached && !remap)
> +		if (!set_uncached && !remap) {
> +			pr_warn_once("coherent DMA allocations not supported on this platform.\n");
>   			return NULL;
> +		}
>   	}
>   
>   	/*
diff mbox series

Patch

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 1327d04fa32a25..fddfea3b2fe173 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -240,8 +240,10 @@  void *dma_direct_alloc(struct device *dev, size_t size,
 		 */
 		set_uncached = IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED);
 		remap = IS_ENABLED(CONFIG_DMA_DIRECT_REMAP);
-		if (!set_uncached && !remap)
+		if (!set_uncached && !remap) {
+			pr_warn_once("coherent DMA allocations not supported on this platform.\n");
 			return NULL;
+		}
 	}
 
 	/*