linux-kernel - Re: [PATCH 1/1] dmaengine: fsl-qdma: add __iomem and struct in union to fix sparse warning

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Date: Fri, 16 Feb 2024 18:03:29 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" <dmaengine@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>, imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] dmaengine: fsl-qdma: add __iomem and struct in union
 to fix sparse warning

On 09-02-24, 16:08, Frank Li wrote:
> Fix below sparse warnings.
> 
> drivers/dma/fsl-qdma.c:645:50: sparse: warning: incorrect type in argument 2 (different address spaces)
> drivers/dma/fsl-qdma.c:645:50: sparse:    expected void [noderef] __iomem *addr
> drivers/dma/fsl-qdma.c:645:50: sparse:    got void
> 
> drivers/dma/fsl-qdma.c:387:15: sparse: sparse: restricted __le32 degrades to integer
> drivers/dma/fsl-qdma.c:390:19: sparse:     expected restricted __le64 [usertype] data
> drivers/dma/fsl-qdma.c:392:13: sparse:     expected unsigned int [assigned] [usertype] cmd

Please document why you are adding the annotations

Also I see this after the patch:

dmaengine/drivers/dma/fsl-edma-main.c:56:16: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-main.c:60:9: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:76:15: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:93:9: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:100:22: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:101:25: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:104:15: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:106:9: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:131:19: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:137:17: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:140:9: warning: cast removes address space '__iomem' of expression
  CC [M]  drivers/dma/idma64.o
dmaengine/drivers/dma/fsl-edma-common.c:473:17: warning: cast removes address space '__iomem' of expression
dmaengine/drivers/dma/fsl-edma-common.c:473:17: warning: cast removes address space '__iomem' of expression

> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202402081929.mggOTHaZ-lkp@intel.com/
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/dma/fsl-qdma.c | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c
> index 1e3bf6f30f784..5005e138fc239 100644
> --- a/drivers/dma/fsl-qdma.c
> +++ b/drivers/dma/fsl-qdma.c
> @@ -161,6 +161,10 @@ struct fsl_qdma_format {
>  			u8 __reserved1[2];
>  			u8 cfg8b_w1;
>  		} __packed;
> +		struct {
> +			__le32 __reserved2;
> +			__le32 cmd;
> +		} __packed;
>  		__le64 data;
>  	};
>  } __packed;
> @@ -355,7 +359,6 @@ static void fsl_qdma_free_chan_resources(struct dma_chan *chan)
>  static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp,
>  				      dma_addr_t dst, dma_addr_t src, u32 len)
>  {
> -	u32 cmd;
>  	struct fsl_qdma_format *sdf, *ddf;
>  	struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest;
>  
> @@ -384,15 +387,11 @@ static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp,
>  	/* This entry is the last entry. */
>  	qdma_csgf_set_f(csgf_dest, len);
>  	/* Descriptor Buffer */
> -	cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE <<
> -			  FSL_QDMA_CMD_RWTTYPE_OFFSET) |
> -			  FSL_QDMA_CMD_PF;
> -	sdf->data = QDMA_SDDF_CMD(cmd);
> -
> -	cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE <<
> -			  FSL_QDMA_CMD_RWTTYPE_OFFSET);
> -	cmd |= cpu_to_le32(FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET);
> -	ddf->data = QDMA_SDDF_CMD(cmd);
> +	sdf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) |
> +			       FSL_QDMA_CMD_PF);
> +
> +	ddf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) |
> +			       (FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET));
>  }
>  
>  /*
> @@ -626,7 +625,7 @@ static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma)
>  
>  static int
>  fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma,
> -				 void *block,
> +				 __iomem void *block,
>  				 int id)
>  {
>  	bool duplicate;
> -- 
> 2.34.1

-- 
~Vinod