linux-kernel - Re: [PATCH] ioat: device control support

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Date:	Fri, 17 May 2013 11:04:29 -0700
From:	Dave Jiang <dave.jiang@...el.com>
To:	Jon Mason <jon.mason@...el.com>
CC:	Dan Williams <djbw@...com>, linux-kernel@...r.kernel.org,
	Vinod Koul <vinod.koul@...el.com>
Subject: Re: [PATCH] ioat: device control support

Acked-by: Dave Jiang <dave.jiang@...el.com>

On 05/17/2013 10:53 AM, Jon Mason wrote:
> Add device control support for CBDMA v2 and v3 in the ioat driver.
> This allows DMA engine clients to call into the ioat driver and issue a
> DMA_TERMINATE_ALL.
>
> Signed-off-by: Jon Mason <jon.mason@...el.com>
> ---
>   drivers/dma/ioat/dma_v2.c |   22 ++++++++++++++++++++++
>   drivers/dma/ioat/dma_v3.c |   22 ++++++++++++++++++++++
>   2 files changed, 44 insertions(+)
>
> diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c
> index b925e1b..d373ee3 100644
> --- a/drivers/dma/ioat/dma_v2.c
> +++ b/drivers/dma/ioat/dma_v2.c
> @@ -847,6 +847,27 @@ void ioat2_free_chan_resources(struct dma_chan *c)
>   	ioat->dmacount = 0;
>   }
>   
> +static int ioat2_device_control(struct dma_chan *c, enum dma_ctrl_cmd cmd,
> +				unsigned long arg)
> +{
> +	struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
> +	struct ioat_chan_common *chan = &ioat->base;
> +
> +	switch (cmd) {
> +	case DMA_TERMINATE_ALL:
> +		spin_lock_bh(&chan->cleanup_lock);
> +		spin_lock_bh(&ioat->prep_lock);
> +		ioat2_restart_channel(ioat);
> +		spin_unlock_bh(&ioat->prep_lock);
> +		spin_unlock_bh(&chan->cleanup_lock);
> +		break;
> +	default:
> +		return -ENOSYS;
> +	}
> +
> +	return 0;
> +}
> +
>   static ssize_t ring_size_show(struct dma_chan *c, char *page)
>   {
>   	struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
> @@ -896,6 +917,7 @@ int ioat2_dma_probe(struct ioatdma_device *device, int dca)
>   	dma->device_alloc_chan_resources = ioat2_alloc_chan_resources;
>   	dma->device_free_chan_resources = ioat2_free_chan_resources;
>   	dma->device_tx_status = ioat_dma_tx_status;
> +	dma->device_control = ioat2_device_control;
>   
>   	err = ioat_probe(device);
>   	if (err)
> diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
> index ca6ea9b..ca6ecdc 100644
> --- a/drivers/dma/ioat/dma_v3.c
> +++ b/drivers/dma/ioat/dma_v3.c
> @@ -1833,6 +1833,27 @@ static int ioat3_reset_hw(struct ioat_chan_common *chan)
>   	return err;
>   }
>   
> +static int ioat3_device_control(struct dma_chan *c, enum dma_ctrl_cmd cmd,
> +				unsigned long arg)
> +{
> +	struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
> +	struct ioat_chan_common *chan = &ioat->base;
> +
> +	switch (cmd) {
> +	case DMA_TERMINATE_ALL:
> +		spin_lock_bh(&chan->cleanup_lock);
> +		spin_lock_bh(&ioat->prep_lock);
> +		ioat3_restart_channel(ioat);
> +		spin_unlock_bh(&ioat->prep_lock);
> +		spin_unlock_bh(&chan->cleanup_lock);
> +		break;
> +	default:
> +		return -ENOSYS;
> +	}
> +
> +	return 0;
> +}
> +
>   static void ioat3_intr_quirk(struct ioatdma_device *device)
>   {
>   	struct dma_device *dma;
> @@ -1878,6 +1899,7 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca)
>   	dma->device_issue_pending = ioat2_issue_pending;
>   	dma->device_alloc_chan_resources = ioat2_alloc_chan_resources;
>   	dma->device_free_chan_resources = ioat2_free_chan_resources;
> +	dma->device_control = ioat3_device_control;
>   
>   	if (is_xeon_cb32(pdev))
>   		dma->copy_align = 6;


-- 

Dave Jiang
Application Engineer, Storage Divsion
Intel Corp.
dave.jiang@...el.com

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