From: Hannes Reinecke <hare@suse.de>
To: Finn Thain <fthain@telegraphics.com.au>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Michael Schmitz <schmitzmic@gmail.com>,
linux-m68k@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Ondrej Zary <linux@rainbow-software.org>, Sam Creasey <sammy@sammy.net>
Subject: Re: [PATCH 01/22] g_ncr5380: Remove CONFIG_SCSI_GENERIC_NCR53C400
Date: Mon, 14 Mar 2016 08:21:07 +0100 [thread overview]
Message-ID: <56E66663.2030704@suse.de> (raw)
In-Reply-To: <20160314042700.855969695@telegraphics.com.au>
On 03/14/2016 05:27 AM, Finn Thain wrote:
> This change brings a number of improvements: fewer macros, better test
> coverage, simpler code and sane Kconfig options. The downside is a small
> chance of incompatibility (which seems unavoidable).
>
> CONFIG_SCSI_GENERIC_NCR53C400 exists to enable or inhibit pseudo DMA
> transfers when the driver is used with 53C400-compatible cards. Thanks to
> Ondrej Zary's patches, PDMA now works which means it can be enabled
> unconditionally.
>
> Due to bad design, CONFIG_SCSI_GENERIC_NCR53C400 ties together unrelated
> functionality as it sets both PSEUDO_DMA and BIOSPARAM macros. This patch
> effectively enables PSEUDO_DMA and disables BIOSPARAM.
>
> The defconfigs and the Kconfig default leave CONFIG_SCSI_GENERIC_NCR53C400
> undefined. Red Hat 9 and CentOS 2.1 were the same. This leaves both
> PSEUDO_DMA and BIOSPARAM disabled. The effect of this patch should be
> better performance from enabling PSEUDO_DMA.
>
> On the other hand, Debian 4 and SLES 10 had CONFIG_SCSI_GENERIC_NCR53C400
> enabled, so both PSEUDO_DMA and BIOSPARAM were enabled. This patch might
> affect configurations like this by disabling BIOSPARAM. My best guess is
> that this could be a problem only in the vanishingly rare case that
> 1) the CHS values stored in the boot device partition table are wrong and
> 2) a 5380 card is in use (because PDMA on 53C400 used to be broken).
>
> Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
>
> ---
>
Reviewed-by: Hannes Reinecke <hare@suse.com>
And don't worry about SLES10; we won't backport your fixes to _that_.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
next prev parent reply other threads:[~2016-03-14 7:21 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-14 4:27 [PATCH 00/22] ncr5380: Eliminate macros, reduce code duplication, fix bugs etc Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 4:27 ` [PATCH 01/22] g_ncr5380: Remove CONFIG_SCSI_GENERIC_NCR53C400 Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:21 ` Hannes Reinecke [this message]
2016-03-14 4:27 ` [PATCH 02/22] ncr5380: Remove FLAG_NO_PSEUDO_DMA where possible Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:21 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 03/22] ncr5380: Remove REAL_DMA and REAL_DMA_POLL macros Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:23 ` Hannes Reinecke
2016-03-14 7:23 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 04/22] atari_NCR5380: Remove DMA_MIN_SIZE macro Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:25 ` Hannes Reinecke
2016-03-14 7:25 ` Hannes Reinecke
2016-03-15 3:18 ` Finn Thain
2016-03-14 4:27 ` [PATCH 05/22] ncr5380: Disable the DMA errata workaround flag by default Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:26 ` Hannes Reinecke
2016-03-14 7:26 ` Hannes Reinecke
2016-03-14 7:26 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 06/22] ncr5380: Remove PSEUDO_DMA macro Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:28 ` Hannes Reinecke
2016-03-14 7:28 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 07/22] ncr5380: Remove BOARD_REQUIRES_NO_DELAY macro Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:33 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 08/22] ncr5380: Use DMA hooks for PDMA Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:34 ` Hannes Reinecke
2016-03-14 7:34 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 09/22] ncr5380: Adopt uniform DMA setup convention Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:36 ` Hannes Reinecke
2016-03-14 7:36 ` Hannes Reinecke
2016-03-15 3:19 ` Finn Thain
2016-03-15 3:19 ` Finn Thain
2016-03-15 6:49 ` Hannes Reinecke
2016-03-15 6:49 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 10/22] ncr5380: Merge DMA implementation from atari_NCR5380 core driver Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:38 ` Hannes Reinecke
2016-03-14 7:38 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 11/22] atari_scsi: Adopt NCR5380.c " Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:39 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 12/22] sun3_scsi: " Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:40 ` Hannes Reinecke
2016-03-14 7:40 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 13/22] ncr5380: Remove disused atari_NCR5380.c " Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:42 ` Hannes Reinecke
2016-03-14 7:42 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 14/22] ncr5380: Add MAX_LUN limit Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:43 ` Hannes Reinecke
2016-03-14 7:51 ` Christoph Hellwig
2016-03-15 3:20 ` Finn Thain
2016-03-15 8:26 ` Christoph Hellwig
2016-03-14 4:27 ` [PATCH 15/22] dmx3191d: Drop max_sectors limit Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:43 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 16/22] ncr5380: Fix register decoding for debugging Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:46 ` Hannes Reinecke
2016-03-15 3:21 ` Finn Thain
2016-03-14 4:27 ` [PATCH 17/22] ncr5380: Remove remaining register storage qualifiers Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:46 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 18/22] ncr5380: Remove DONT_USE_INTR and AUTOPROBE_IRQ macros Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:47 ` Hannes Reinecke
2016-03-14 7:47 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 19/22] ncr5380: Update usage documentation Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:47 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 20/22] atari_scsi: Set a reasonable default for cmd_per_lun Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:49 ` Hannes Reinecke
2016-03-15 3:27 ` Finn Thain
2016-03-15 6:53 ` Hannes Reinecke
2016-03-15 8:27 ` Finn Thain
2016-03-15 14:34 ` James Bottomley
2016-03-14 4:27 ` [PATCH 21/22] atari_scsi: Allow can_queue to be increased for Falcon Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:58 ` Hannes Reinecke
2016-03-14 7:58 ` Hannes Reinecke
2016-03-14 4:27 ` [PATCH 22/22] mac_scsi: Fix pseudo DMA implementation Finn Thain
2016-03-14 4:27 ` Finn Thain
2016-03-14 7:59 ` Hannes Reinecke
2016-03-18 7:03 ` [PATCH 00/22] ncr5380: Eliminate macros, reduce code duplication, fix bugs etc Michael Schmitz
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