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Message-Id: <FFA34064-D392-44A6-826C-F2E6A04AB788@freescale.com>
Date:	Tue, 17 Mar 2009 17:24:02 -0500
From:	Becky Bruce <becky.bruce@...escale.com>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	Andy Fleming <afleming@...escale.com>, linuxppc-dev@...abs.org
Subject: Re: [PATCH] gianfar: pass the proper dev to DMA ops


On Mar 17, 2009, at 11:16 AM, Kumar Gala wrote:

> We need to be passing the of_platform device struct into the DMA ops  
> as
> its the one that has the archdata setup to know which low-level DMA  
> ops we
> should be using (not the net_device one).  This isn't an issue until  
> we
> expect the archdata to be setup correctly.
>
> Signed-off-by: Kumar Gala <galak@...nel.crashing.org>

Boots on 8641D stock config and gets rid of the panic I was seeing.

Acked-by: Becky Bruce <beckyb@...nel.crashing.org>

Cheers,
Becky

>
> ---
>
> Dave,
>
> This is for net-next.  We are working on having per device dma ops  
> for .30 and
> expect the struct device archdata to be setup properly but in .29 we  
> still
> default to a direct DMA ops on ppc32 so this "bug" will never show up.
>
> - k
>
> drivers/net/gianfar.c |   34 ++++++++++++++++++----------------
> drivers/net/gianfar.h |    3 ++-
> 2 files changed, 20 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
> index bed30ef..8659833 100644
> --- a/drivers/net/gianfar.c
> +++ b/drivers/net/gianfar.c
> @@ -365,8 +365,10 @@ static int gfar_probe(struct of_device *ofdev,
> 		return -ENOMEM;
>
> 	priv = netdev_priv(dev);
> -	priv->dev = dev;
> +	priv->ndev = dev;
> +	priv->ofdev = ofdev;
> 	priv->node = ofdev->node;
> +	SET_NETDEV_DEV(dev, &ofdev->dev);
>
> 	err = gfar_of_init(dev);
>
> @@ -538,7 +540,7 @@ static int gfar_remove(struct of_device *ofdev)
> 	dev_set_drvdata(&ofdev->dev, NULL);
>
> 	iounmap(priv->regs);
> -	free_netdev(priv->dev);
> +	free_netdev(priv->ndev);
>
> 	return 0;
> }
> @@ -870,7 +872,7 @@ void stop_gfar(struct net_device *dev)
>
> 	free_skb_resources(priv);
>
> -	dma_free_coherent(&dev->dev,
> +	dma_free_coherent(&priv->ofdev->dev,
> 			sizeof(struct txbd8)*priv->tx_ring_size
> 			+ sizeof(struct rxbd8)*priv->rx_ring_size,
> 			priv->tx_bd_base,
> @@ -892,12 +894,12 @@ static void free_skb_resources(struct  
> gfar_private *priv)
> 		if (!priv->tx_skbuff[i])
> 			continue;
>
> -		dma_unmap_single(&priv->dev->dev, txbdp->bufPtr,
> +		dma_unmap_single(&priv->ofdev->dev, txbdp->bufPtr,
> 				txbdp->length, DMA_TO_DEVICE);
> 		txbdp->lstatus = 0;
> 		for (j = 0; j < skb_shinfo(priv->tx_skbuff[i])->nr_frags; j++) {
> 			txbdp++;
> -			dma_unmap_page(&priv->dev->dev, txbdp->bufPtr,
> +			dma_unmap_page(&priv->ofdev->dev, txbdp->bufPtr,
> 					txbdp->length, DMA_TO_DEVICE);
> 		}
> 		txbdp++;
> @@ -914,7 +916,7 @@ static void free_skb_resources(struct  
> gfar_private *priv)
> 	if(priv->rx_skbuff != NULL) {
> 		for (i = 0; i < priv->rx_ring_size; i++) {
> 			if (priv->rx_skbuff[i]) {
> -				dma_unmap_single(&priv->dev->dev, rxbdp->bufPtr,
> +				dma_unmap_single(&priv->ofdev->dev, rxbdp->bufPtr,
> 						priv->rx_buffer_size,
> 						DMA_FROM_DEVICE);
>
> @@ -980,7 +982,7 @@ int startup_gfar(struct net_device *dev)
> 	gfar_write(&regs->imask, IMASK_INIT_CLEAR);
>
> 	/* Allocate memory for the buffer descriptors */
> -	vaddr = (unsigned long) dma_alloc_coherent(&dev->dev,
> +	vaddr = (unsigned long) dma_alloc_coherent(&priv->ofdev->dev,
> 			sizeof (struct txbd8) * priv->tx_ring_size +
> 			sizeof (struct rxbd8) * priv->rx_ring_size,
> 			&addr, GFP_KERNEL);
> @@ -1192,7 +1194,7 @@ err_rxalloc_fail:
> rx_skb_fail:
> 	free_skb_resources(priv);
> tx_skb_fail:
> -	dma_free_coherent(&dev->dev,
> +	dma_free_coherent(&priv->ofdev->dev,
> 			sizeof(struct txbd8)*priv->tx_ring_size
> 			+ sizeof(struct rxbd8)*priv->rx_ring_size,
> 			priv->tx_bd_base,
> @@ -1345,7 +1347,7 @@ static int gfar_start_xmit(struct sk_buff  
> *skb, struct net_device *dev)
> 			if (i == nr_frags - 1)
> 				lstatus |= BD_LFLAG(TXBD_LAST | TXBD_INTERRUPT);
>
> -			bufaddr = dma_map_page(&dev->dev,
> +			bufaddr = dma_map_page(&priv->ofdev->dev,
> 					skb_shinfo(skb)->frags[i].page,
> 					skb_shinfo(skb)->frags[i].page_offset,
> 					length,
> @@ -1377,7 +1379,7 @@ static int gfar_start_xmit(struct sk_buff  
> *skb, struct net_device *dev)
>
> 	/* setup the TxBD length and buffer pointer for the first BD */
> 	priv->tx_skbuff[priv->skb_curtx] = skb;
> -	txbdp_start->bufPtr = dma_map_single(&dev->dev, skb->data,
> +	txbdp_start->bufPtr = dma_map_single(&priv->ofdev->dev, skb->data,
> 			skb_headlen(skb), DMA_TO_DEVICE);
>
> 	lstatus |= BD_LFLAG(TXBD_CRC | TXBD_READY) | skb_headlen(skb);
> @@ -1563,7 +1565,7 @@ static void gfar_reset_task(struct work_struct  
> *work)
> {
> 	struct gfar_private *priv = container_of(work, struct gfar_private,
> 			reset_task);
> -	struct net_device *dev = priv->dev;
> +	struct net_device *dev = priv->ndev;
>
> 	if (dev->flags & IFF_UP) {
> 		stop_gfar(dev);
> @@ -1610,7 +1612,7 @@ static int gfar_clean_tx_ring(struct  
> net_device *dev)
> 				(lstatus & BD_LENGTH_MASK))
> 			break;
>
> -		dma_unmap_single(&dev->dev,
> +		dma_unmap_single(&priv->ofdev->dev,
> 				bdp->bufPtr,
> 				bdp->length,
> 				DMA_TO_DEVICE);
> @@ -1619,7 +1621,7 @@ static int gfar_clean_tx_ring(struct  
> net_device *dev)
> 		bdp = next_txbd(bdp, base, tx_ring_size);
>
> 		for (i = 0; i < frags; i++) {
> -			dma_unmap_page(&dev->dev,
> +			dma_unmap_page(&priv->ofdev->dev,
> 					bdp->bufPtr,
> 					bdp->length,
> 					DMA_TO_DEVICE);
> @@ -1696,7 +1698,7 @@ static void gfar_new_rxbdp(struct net_device  
> *dev, struct rxbd8 *bdp,
> 	struct gfar_private *priv = netdev_priv(dev);
> 	u32 lstatus;
>
> -	bdp->bufPtr = dma_map_single(&dev->dev, skb->data,
> +	bdp->bufPtr = dma_map_single(&priv->ofdev->dev, skb->data,
> 			priv->rx_buffer_size, DMA_FROM_DEVICE);
>
> 	lstatus = BD_LFLAG(RXBD_EMPTY | RXBD_INTERRUPT);
> @@ -1856,7 +1858,7 @@ int gfar_clean_rx_ring(struct net_device *dev,  
> int rx_work_limit)
>
> 		skb = priv->rx_skbuff[priv->skb_currx];
>
> -		dma_unmap_single(&priv->dev->dev, bdp->bufPtr,
> +		dma_unmap_single(&priv->ofdev->dev, bdp->bufPtr,
> 				priv->rx_buffer_size, DMA_FROM_DEVICE);
>
> 		/* We drop the frame if we failed to allocate a new buffer */
> @@ -1916,7 +1918,7 @@ int gfar_clean_rx_ring(struct net_device *dev,  
> int rx_work_limit)
> static int gfar_poll(struct napi_struct *napi, int budget)
> {
> 	struct gfar_private *priv = container_of(napi, struct gfar_private,  
> napi);
> -	struct net_device *dev = priv->dev;
> +	struct net_device *dev = priv->ndev;
> 	int tx_cleaned = 0;
> 	int rx_cleaned = 0;
> 	unsigned long flags;
> diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
> index 54332b0..dd499d7 100644
> --- a/drivers/net/gianfar.h
> +++ b/drivers/net/gianfar.h
> @@ -738,7 +738,8 @@ struct gfar_private {
> 	spinlock_t rxlock;
>
> 	struct device_node *node;
> -	struct net_device *dev;
> +	struct net_device *ndev;
> +	struct of_device *ofdev;
> 	struct napi_struct napi;
>
> 	/* skb array and index */
> -- 
> 1.5.6.6
>
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@...abs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev

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