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From: Olof Johansson <olof@lixom.net>
To: "Dan Williams" <dan.j.williams@gmail.com>
Cc: christopher.leech@intel.com, "Jeff Garzik" <jeff@garzik.org>,
	neilb@suse.de, linux-raid@vger.kernel.org, akpm@osdl.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] dmaengine: clean up and abstract function types (was Re: [PATCH 08/19] dmaengine: enable multiple clients and operations)
Date: Mon, 18 Sep 2006 20:05:55 -0500	[thread overview]
Message-ID: <20060918200555.74aedeae@localhost.localdomain> (raw)
In-Reply-To: <e9c3a7c20609181556n235d650eg16e5296f192bd2d5@mail.gmail.com>

On Mon, 18 Sep 2006 15:56:37 -0700 "Dan Williams" <dan.j.williams@gmail.com> wrote:

> On 9/15/06, Olof Johansson <olof@lixom.net> wrote:
> > On Fri, 15 Sep 2006 11:38:17 -0500 Olof Johansson <olof@lixom.net> wrote:

> > Chris/Dan: Please consider picking this up as a base for the added
> > functionality and cleanups.
> >
> Thanks for this Olof it has sparked some ideas about how to redo
> support for multiple operations.

Good. :)

> I think we should keep the operation type in the function name but
> drop all the [buf|pg|dma]_to_[buf|pg|dma] permutations.  The buffer
> type can be handled generically across all operation types.  Something
> like the following for a pg_to_buf memcpy.
> 
> struct dma_async_op_memcpy *op;
> struct page *pg;
> void *buf;
> size_t len;
> 
> dma_async_op_init_src_pg(op, pg);
> dma_async_op_init_dest_buf(op, buf);
> dma_async_memcpy(chan, op, len);

I'm generally for a more generic interface, especially in the address
permutation cases like above. However, I think it'll be a mistake to
keep the association between the API and the function names and types
so close.

What's the benefit of keeping a memcpy-specific dma_async_memcpy()
instead of a more generic dma_async_commit() (or similar)? We'll know
based on how the client/channel was allocated what kind of function is
requested, won't we?

Same goes for the dma_async_op_memcpy. Make it an union that has a type
field if you need per-operation settings. But as before, we'll know
what kind of op structure gets passed in since we'll know what kind of
operation is to be performed on it.

Finally, yet again the same goes for the op_init settings. I would even
prefer it to not be function-based, instead just direct union/struct
assignments.

struct dma_async_op op;
...

op.src_type = PG; op.src = pg;
op.dest_type = BUF; op.dest = buf;
op.len = len;
dma_async_commit(chan, op);

op might have to be dynamically allocated, since it'll outlive the
scope of this function. But the idea would be the same.


-Olof

  reply	other threads:[~2006-09-19  1:08 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-09-11 23:00 [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction Dan Williams
2006-09-11 23:17 ` [PATCH 01/19] raid5: raid5_do_soft_block_ops Dan Williams
2006-09-11 23:34   ` Jeff Garzik
2006-09-11 23:17 ` [PATCH 02/19] raid5: move write operations to a workqueue Dan Williams
2006-09-11 23:36   ` Jeff Garzik
2006-09-11 23:17 ` [PATCH 03/19] raid5: move check parity " Dan Williams
2006-09-11 23:17 ` [PATCH 04/19] raid5: move compute block " Dan Williams
2006-09-11 23:18 ` [PATCH 05/19] raid5: move read completion copies " Dan Williams
2006-09-11 23:18 ` [PATCH 06/19] raid5: move the reconstruct write expansion operation " Dan Williams
2006-09-11 23:18 ` [PATCH 07/19] raid5: remove compute_block and compute_parity5 Dan Williams
2006-09-11 23:18 ` [PATCH 08/19] dmaengine: enable multiple clients and operations Dan Williams
2006-09-11 23:44   ` Jeff Garzik
2006-09-12  0:14     ` Dan Williams
2006-09-12  0:52       ` Roland Dreier
2006-09-12  6:18         ` Dan Williams
2006-09-12  9:15           ` Evgeniy Polyakov
2006-09-13  4:04           ` Jeff Garzik
2006-09-15 16:38     ` Olof Johansson
2006-09-15 19:44       ` [PATCH] dmaengine: clean up and abstract function types (was Re: [PATCH 08/19] dmaengine: enable multiple clients and operations) Olof Johansson
2006-09-15 20:02         ` [PATCH] [v2] " Olof Johansson
2006-09-18 22:56         ` [PATCH] " Dan Williams
2006-09-19  1:05           ` Olof Johansson [this message]
2006-09-19 11:20             ` Alan Cox
2006-09-19 16:32               ` Olof Johansson
2006-09-11 23:18 ` [PATCH 09/19] dmaengine: reduce backend address permutations Dan Williams
2006-09-15 14:46   ` Olof Johansson
2006-09-11 23:18 ` [PATCH 10/19] dmaengine: expose per channel dma mapping characteristics to clients Dan Williams
2006-09-11 23:18 ` [PATCH 11/19] dmaengine: add memset as an asynchronous dma operation Dan Williams
2006-09-11 23:50   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 12/19] dmaengine: dma_async_memcpy_err for DMA engines that do not support memcpy Dan Williams
2006-09-11 23:51   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 13/19] dmaengine: add support for dma xor zero sum operations Dan Williams
2006-09-11 23:18 ` [PATCH 14/19] dmaengine: add dma_sync_wait Dan Williams
2006-09-11 23:52   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 15/19] dmaengine: raid5 dma client Dan Williams
2006-09-11 23:54   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 16/19] dmaengine: Driver for the Intel IOP 32x, 33x, and 13xx RAID engines Dan Williams
2006-09-15 14:57   ` Olof Johansson
2006-09-11 23:19 ` [PATCH 17/19] iop3xx: define IOP3XX_REG_ADDR[32|16|8] and clean up DMA/AAU defs Dan Williams
2006-09-11 23:55   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 18/19] iop3xx: Give Linux control over PCI (ATU) initialization Dan Williams
2006-09-11 23:56   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 19/19] iop3xx: IOP 32x and 33x support for the iop-adma driver Dan Williams
2006-09-11 23:38 ` [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction Jeff Garzik
2006-09-11 23:53   ` Dan Williams
2006-09-12  2:41     ` Jeff Garzik
2006-09-12  5:47       ` Dan Williams
2006-09-13  4:05         ` Jeff Garzik
2006-09-13  7:15 ` Jakob Oestergaard
2006-09-13 19:17   ` Dan Williams
2006-09-14  7:42     ` Jakob Oestergaard
2006-10-11  1:46       ` Dan Williams
2006-10-08 22:18 ` Neil Brown
2006-10-10 18:23   ` Dan Williams
2006-10-11  2:44     ` Neil Brown

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