linux-kernel - Re: [PATCH 11/21] Staging: hv: Make vmbus driver a platform pci driver

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Date:	Thu, 10 Mar 2011 14:20:34 -0800
From:	Greg KH <gregkh@...e.de>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	virtualization@...ts.osdl.org,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Mike Sterling <mike.sterling@...rosoft.com>,
	Abhishek Kane <v-abkane@...rosoft.com>,
	Hank Janssen <hjanssen@...rosoft.com>
Subject: Re: [PATCH 11/21] Staging: hv: Make vmbus driver a platform pci
 driver

On Thu, Mar 10, 2011 at 02:08:32PM -0800, K. Y. Srinivasan wrote:
> Make vmbus driver a platform pci driver. This is
> in preparation to cleaning up irq allocation for this
> driver.

The idea is nice, but the nameing is a bit confusing.

We have "platform drivers" which are much different from what you are
doing here, you are just creating a "normal" pci driver.

Very minor comments below.

> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> Signed-off-by: Mike Sterling <mike.sterling@...rosoft.com>
> Signed-off-by: Abhishek Kane <v-abkane@...rosoft.com>
> Signed-off-by: Hank Janssen <hjanssen@...rosoft.com>
> ---
>  drivers/staging/hv/vmbus_drv.c |   63 +++++++++++++++++++++++-----------------
>  1 files changed, 36 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c
> index 8b9394a..e4855ac 100644
> --- a/drivers/staging/hv/vmbus_drv.c
> +++ b/drivers/staging/hv/vmbus_drv.c
> @@ -43,6 +43,8 @@
>  
>  static struct device *root_dev; /* Root device */
>  
> +struct pci_dev *hv_pci_dev;
> +
>  /* Main vmbus driver data structure */
>  struct vmbus_driver_context {
>  
> @@ -887,36 +889,24 @@ static irqreturn_t vmbus_isr(int irq, void *dev_id)
>  	}
>  }
>  
> -static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
> -	{
> -		.ident = "Hyper-V",
> -		.matches = {
> -			DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
> -			DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
> -			DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
> -		},
> -	},
> -	{ },
> -};
> -MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);

You're sure it's safe to delete this now and just rely on the PCI ids,
right?  For some wierd reason I thought we needed both to catch all
types of systems, but I can't remember why.

>  
> -static int __init vmbus_init(void)
> +
> +static int __devinit hv_pci_probe(struct pci_dev *pdev,
> +				const struct pci_device_id *ent)
>  {
> -	DPRINT_INFO(VMBUS_DRV,
> -		"Vmbus initializing.... current log level 0x%x (%x,%x)",
> -		vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
> -	/* Todo: it is used for loglevel, to be ported to new kernel. */
> +	int err;
>  
> -	if (!dmi_check_system(microsoft_hv_dmi_table))
> -		return -ENODEV;
> +	hv_pci_dev = pdev;
>  
> -	return vmbus_bus_init();
> -}
> +	err = pci_enable_device(pdev);
> +	if (err)
> +		return err;
>  
> -static void __exit vmbus_exit(void)
> -{
> -	vmbus_bus_exit();
> -	/* Todo: it is used for loglevel, to be ported to new kernel. */
> +	err = vmbus_bus_init();
> +	if (err)
> +		pci_disable_device(pdev);
> +
> +	return err;
>  }
>  
>  /*
> @@ -931,10 +921,29 @@ static const struct pci_device_id microsoft_hv_pci_table[] = {
>  };
>  MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
>  
> +static struct pci_driver platform_driver = {

"hv_bus_driver"?

> +	.name =           "hv-platform-pci",

How about "hv_bus" as a name, as that's what this really is.  It's a
"bus adapter", like USB, Firewire, and all sorts of other bus
controllers.

> +	.probe =          hv_pci_probe,
> +	.id_table =       microsoft_hv_pci_table,
> +};
> +
> +static int __init hv_pci_init(void)
> +{
> +	return pci_register_driver(&platform_driver);
> +}
> +
> +static void __exit hv_pci_exit(void)
> +{
> +	vmbus_bus_exit();
> +	pci_unregister_driver(&platform_driver);
> +}
> +
> +
> +
>  MODULE_LICENSE("GPL");
>  MODULE_VERSION(HV_DRV_VERSION);
>  module_param(vmbus_irq, int, S_IRUGO);
>  module_param(vmbus_loglevel, int, S_IRUGO);
>  
> -module_init(vmbus_init);
> -module_exit(vmbus_exit);
> +module_init(hv_pci_init);
> +module_exit(hv_pci_exit);
> -- 
> 1.5.5.6
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