linux-kernel - Re: [PATCH 00/18] misc generic ide stuff

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Message-Id: <200806141929.00459.bzolnier@gmail.com>
Date:	Sat, 14 Jun 2008 19:29:00 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Borislav Petkov <petkovbb@...glemail.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Borislav Petkov <petkovbb@...il.com>
Subject: Re: [PATCH 00/18] misc generic ide stuff


Hi,

On Thursday 12 June 2008, Borislav Petkov wrote:
> Hi Bart,
> 
> here are some generic ide conversion patches. The first 12 are what i thought
> you suggested :) concerning prepping the ide-cd code for the generic layer. The
> remaining 6 are what i've done so far wrt removing ide_atapi_pc from the ide
> drivers. It is obvious that this is not trivial and I basically tiptoe around the

Thanks.

I applied patches #1-2, #5-12 and #14-15.

I skipped patches #3-4, #13 and #16-18 for now
(more details in replies to corresponding mails).

> landmines in the IRQ handler and request issue paths :). This raises also
> several questions:
> 
> 1. ide-cd uses the cdrom_info struct for e.g. dma status notification, the other
> ide drivers use it per packet command in pc->flags. Well the last are kinda too
> much to carry for _each_ command and i'm thinking maybe put all that in the
> ide_drive_t and make it generic enough to fit all drivers. This way
> pc->callback() can also be harboured there. One concern might be when a flag is
> strictly per packet command which could be put somewhere else (maybe in the
> struct request since it already has members when it is used as a packet
> command).

Some pc->flags describe device's properties and thus should be moved to
ide_drive_t (->dev_flags) while some other correspond to the queued command
and moving them to ide_drive_t would be a bad idea IMO.

For ATA commands I was planning to put taskfile flags into rq->special field
(well, I actually implemented it in draft patch and it looks OK) so maybe we
can do something similar for packet commands.
 
> 2. Can all that pc->xferred, pc->b_count, pc->errors and pc->cur_pos accounting
> be safely mapped to a rq? I see some discrepancies like is pc->buf_size ==
> rq->data_len, what about pc->req_xfer? I'll have a more detailed look at those
> when i have more spare time later.

If you ask if they can be mapped 'directly' then the answer is: "probably no"
but if the question is whether it is possible to do it after some changes then
the answer is: "probably yes". :)

[ However it may be necessary to convert ATAPI drivers to use scatterlists
  instead of open-coded ->bio walking for PIO transfers first. ]

Thanks,
Bart
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