linux-kernel - Re: [PATCH] pci: show dma

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Date:	Thu, 23 Oct 2008 00:48:15 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Grant Grundler <grundler@...isc-linux.org>,
	Matthew Wilcox <matthew@....cx>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: show dma_mask bits in /sys

On Wed, Oct 22, 2008 at 06:45:10PM -0700, Yinghai Lu wrote:
> Grant prefer to add it /sys instead of showing in bootlog
> 
> so could catch if the driver set the correct dma_mask.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 
> ---
>  drivers/pci/pci-sysfs.c |   17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> Index: linux-2.6/drivers/pci/pci-sysfs.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/pci-sysfs.c
> +++ linux-2.6/drivers/pci/pci-sysfs.c
> @@ -169,6 +169,21 @@ numa_node_show(struct device *dev, struc
>  #endif
>  
>  static ssize_t
> +dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +
> +	return sprintf (buf, "%d\n", fls64(pdev->dma_mask));

Is there any reason to use %d instead of "0x%x" ?
I'd much rather see this dumped in hex.

> +}
> +
> +static ssize_t
> +consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
> +				 char *buf)
> +{
> +	return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
> +}
> +
> +static ssize_t
>  msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
>  {
>  	struct pci_dev *pdev = to_pci_dev(dev);
> @@ -223,6 +238,8 @@ struct device_attribute pci_dev_attrs[]
>  #ifdef CONFIG_NUMA
>  	__ATTR_RO(numa_node),
>  #endif
> +	__ATTR_RO(dma_mask_bits),
> +	__ATTR_RO(consistent_dma_mask_bits),
>  	__ATTR(enable, 0600, is_enabled_show, is_enabled_store),
>  	__ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
>  		broken_parity_status_show,broken_parity_status_store),

Otherwise looks good to me.

thanks,
grant
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