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From: Christoph Hellwig <hch@lst.de>
To: "Maciej W. Rozycki" <macro@orcam.me.uk>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	Khalid Aziz <khalid@gonehiking.org>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Matthew Wilcox <willy@infradead.org>,
	Hannes Reinecke <hare@suse.com>,
	Ondrej Zary <linux@rainbow-software.org>,
	linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
	Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH 2/8] Buslogic: remove ISA support
Date: Tue, 6 Apr 2021 08:27:50 +0200	[thread overview]
Message-ID: <20210406062750.GA6277@lst.de> (raw)
In-Reply-To: <alpine.DEB.2.21.2104031805520.18977@angie.orcam.me.uk>

On Sat, Apr 03, 2021 at 06:58:24PM +0200, Maciej W. Rozycki wrote:
>  Last but not least I do hope you do not plan to retire ISA DMA bounce 
> buffering support for drivers/block/floppy.c, as there is hardly an 
> alternative available (I do have a single SCSI<->FDD interface built 
> around an Intel 8080 CPU, in the half-height 5.25" drive form factor, but 
> such devices are exceedingly rare, and then you need a suitable parallel 
> SCSI host too).

The floppy driver already uses its own bounce buffering for addressing
limitations, and only the kernel bounce buffering to avoid getting
fed highmem patches.  Please take a look at this series to clean up the
latter:

https://lore.kernel.org/linux-block/20210406061755.811522-1-hch@lst.de/T/#u

>  Would it be feasible to convert it and any other drivers for ISA DMA 
> devices (like those support for which you propose to remove here) still 
> have users who could verify operation to the IOMMU framework?

I've converted the only once that still has signs of having users in
the last 10 or so years.

  reply	other threads:[~2021-04-06  6:27 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31  7:29 start removing block bounce buffering support v3 Christoph Hellwig
2021-03-31  7:29 ` [PATCH 1/8] aha1542: use a local bounce buffer Christoph Hellwig
2021-03-31  7:29 ` [PATCH 2/8] Buslogic: remove ISA support Christoph Hellwig
2021-03-31 18:24   ` Khalid Aziz
2021-04-03 16:58   ` Maciej W. Rozycki
2021-04-06  6:27     ` Christoph Hellwig [this message]
2021-04-06 15:42       ` Maciej W. Rozycki
2021-04-12 12:26     ` Maciej W. Rozycki
2021-03-31  7:29 ` [PATCH 3/8] BusLogic: reject broken old firmware that requires ISA-style bounce buffering Christoph Hellwig
2021-03-31  7:29 ` [PATCH 4/8] advansys: remove ISA support Christoph Hellwig
2021-03-31  7:59   ` Hannes Reinecke
2021-03-31  7:29 ` [PATCH 5/8] scsi: remove the unchecked_isa_dma flag Christoph Hellwig
2021-04-09 15:46   ` Steffen Maier
2021-04-10  6:52     ` Christoph Hellwig
2021-04-12 14:04       ` Steffen Maier
2021-03-31  7:29 ` [PATCH 6/8] block: remove BLK_BOUNCE_ISA support Christoph Hellwig
2021-03-31  7:30 ` [PATCH 7/8] block: refactor the bounce buffering code Christoph Hellwig
2021-03-31  7:30 ` [PATCH 8/8] block: stop calling blk_queue_bounce for passthrough requests Christoph Hellwig
2021-04-08 21:45   ` Guenter Roeck
2021-04-09  7:40     ` Christoph Hellwig
2021-04-09 13:04       ` Guenter Roeck
2021-04-06 15:28 ` start removing block bounce buffering support v3 Jens Axboe
  -- strict thread matches above, loose matches on Subject: below --
2021-03-26  5:58 start removing block bounce buffering support v2 Christoph Hellwig
2021-03-26  5:58 ` [PATCH 2/8] Buslogic: remove ISA support Christoph Hellwig
2021-03-29  6:22   ` Hannes Reinecke
2021-03-29 20:29   ` Khalid Aziz
2021-03-30 17:03     ` Christoph Hellwig
2021-03-30 17:15       ` Khalid Aziz
2021-03-30 17:31         ` Christoph Hellwig
2021-03-18  6:39 start removing block bounce buffering support Christoph Hellwig
2021-03-18  6:39 ` [PATCH 2/8] Buslogic: remove ISA support Christoph Hellwig

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