linux-kernel - RE: Hyper-V TODO file

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Message-ID: <6E21E5352C11B742B20C142EB499E048081B5C8E@TK5EX14MBXC126.redmond.corp.microsoft.com>
Date:	Thu, 1 Sep 2011 21:08:44 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Greg KH <greg@...ah.com>
CC:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>
Subject: RE: Hyper-V TODO file



> -----Original Message-----
> From: Greg KH [mailto:greg@...ah.com]
> Sent: Thursday, September 01, 2011 4:31 PM
> To: KY Srinivasan
> Cc: gregkh@...e.de; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; virtualization@...ts.osdl.org
> Subject: Re: Hyper-V TODO file
> 
> On Thu, Sep 01, 2011 at 01:27:33PM -0700, Greg KH wrote:
> > On Wed, Aug 31, 2011 at 03:16:51PM -0700, K. Y. Srinivasan wrote:
> > > 2) With your help, we have fixed all of the issues related to these drivers
> > > conforming to the Linux Device Driver model. One of the TODO work items is
> > > "audit the vmbus to verify it is working properly with the driver model".
> >
> > I have a few comments about this, I'll respond in another email.
> 
> Ok, it looks a _lot_ better, but I have a few minor nits, and one larger
> one:
> 
> - rename the vmbus_child_* functions to vmbus_* as there's no need to
>   think of "children" here.

Ok; will do.
> 
> - vmbus_onoffer comment is incorrect.  You handle offers from lots of
>   other types.  Or if not, am I reading the code incorrectly?

You are right; I will clean this up.

> 
> - the static hv_cb_utils array needs to go away.  In the hv_utils.c
>   util_probe() call, properly register the channel callback, and the
>   same goes for the util_remove() call, unregister things there.
>   Note, you can use the driver_data field to determine exactly which
>   callback needs to be registered to make things easy.  Something like
>   the following (pseudo code only):
> 
> static const struct hv_vmbus_device_id id_table[] = {
> 	/* Shutdown guid */
> 	{ VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
> 		       0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB),
> 	  .driver_data = &shutdown_onchannelcallback },
> 	....
> };
> 
> util_probe(struct hv_device *dev, const struct hv_vmbus_device_id *id)
>  [ Yes, you will have to change the probe callback signature, but that's fine. ]
> {
> 	void *fn(void *context);
> 	u8 *buffer;
> 
> 	fn = id->driver_data;
> 	buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
> 
> 	/* Hook up callback and buffer with a call to the proper vmbus
> 	 * function
> 	 */
> 	 ...
> }
> 
> util_remove()
> {
> 	/* undo what you did in util_probe(), unhooking the callback and
> 	 * freeing the data */
> }
> 
> 
> Does that make any sense?

Yes; I will get these patches to you soon. I see how the data ptr can be used;
I will buy you the beer the next time we meet.

Regards,

K. Y
> 
> thanks,
> 
> greg k-h

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