linux-kernel - Re: [FIXED PATCH v4 6/8] dmaengine: xilinx: xdma: Add transfer error reporting

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Message-ID: <ZXbqcGSL6oVD8YDS@matsya>
Date:   Mon, 11 Dec 2023 16:24:40 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Jan Kuliga <jankul@...tek.krakow.pl>
Cc:     lizhi.hou@....com, brian.xu@....com, raj.kumar.rampelli@....com,
        michal.simek@....com, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org, miquel.raynal@...tlin.com
Subject: Re: [FIXED PATCH v4 6/8] dmaengine: xilinx: xdma: Add transfer error
 reporting

On 08-12-23, 23:08, Jan Kuliga wrote:
> Extend the capability of transfer status reporting. Introduce error flag,
> which allows to report error in case of a interrupt-reported error
> condition.

Pls post the updated series, noting changes from last rev

> 
> Signed-off-by: Jan Kuliga <jankul@...tek.krakow.pl>
> ---
>  drivers/dma/xilinx/xdma.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c
> index d1bc36133a45..a7cd378b7e9a 100644
> --- a/drivers/dma/xilinx/xdma.c
> +++ b/drivers/dma/xilinx/xdma.c
> @@ -85,6 +85,7 @@ struct xdma_chan {
>   * @cyclic: Cyclic transfer vs. scatter-gather
>   * @periods: Number of periods in the cyclic transfer
>   * @period_size: Size of a period in bytes in cyclic transfers
> + * @error: tx error flag
>   */
>  struct xdma_desc {
>  	struct virt_dma_desc		vdesc;
> @@ -97,6 +98,7 @@ struct xdma_desc {
>  	bool				cyclic;
>  	u32				periods;
>  	u32				period_size;
> +	bool				error;
>  };
> 
>  #define XDMA_DEV_STATUS_REG_DMA		BIT(0)
> @@ -274,6 +276,7 @@ xdma_alloc_desc(struct xdma_chan *chan, u32 desc_num, bool cyclic)
>  	sw_desc->chan = chan;
>  	sw_desc->desc_num = desc_num;
>  	sw_desc->cyclic = cyclic;
> +	sw_desc->error = false;
>  	dblk_num = DIV_ROUND_UP(desc_num, XDMA_DESC_ADJACENT);
>  	sw_desc->desc_blocks = kcalloc(dblk_num, sizeof(*sw_desc->desc_blocks),
>  				       GFP_NOWAIT);
> @@ -770,20 +773,20 @@ static enum dma_status xdma_tx_status(struct dma_chan *chan, dma_cookie_t cookie
>  	spin_lock_irqsave(&xdma_chan->vchan.lock, flags);
> 
>  	vd = vchan_find_desc(&xdma_chan->vchan, cookie);
> -	if (vd)
> -		desc = to_xdma_desc(vd);
> -	if (!desc || !desc->cyclic) {
> -		spin_unlock_irqrestore(&xdma_chan->vchan.lock, flags);
> -		return ret;
> -	}
> -
> -	period_idx = desc->completed_desc_num % desc->periods;
> -	residue = (desc->periods - period_idx) * desc->period_size;
> +	if (!vd)
> +		goto out;
> 
> +	desc = to_xdma_desc(vd);
> +	if (desc->error) {
> +		ret = DMA_ERROR;
> +	} else if (desc->cyclic) {
> +		period_idx = desc->completed_desc_num % desc->periods;
> +		residue = (desc->periods - period_idx) * desc->period_size;
> +		dma_set_residue(state, residue);
> +	}
> +out:
>  	spin_unlock_irqrestore(&xdma_chan->vchan.lock, flags);
> 
> -	dma_set_residue(state, residue);
> -
>  	return ret;
>  }
> 
> @@ -820,6 +823,7 @@ static irqreturn_t xdma_channel_isr(int irq, void *dev_id)
>  	st &= XDMA_CHAN_STATUS_MASK;
>  	if ((st & XDMA_CHAN_ERROR_MASK) ||
>  		!(st & (CHAN_CTRL_IE_DESC_COMPLETED | CHAN_CTRL_IE_DESC_STOPPED))) {
> +		desc->error = true;
>  		xdma_err(xdev, "channel error, status register value: 0x%x", st);
>  		goto out;
>  	}
> --
> 2.34.1

-- 
~Vinod