linux-kernel - [PATCH 05/11] scsi: mac_scsi: Enable scatter/gather by default

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Message-Id: <f155ba5ce93055cbc6ac6d4026673f40f826edb8.1723001788.git.fthain@linux-m68k.org>
Date: Wed, 07 Aug 2024 13:36:28 +1000
From: Finn Thain <fthain@...ux-m68k.org>
To: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
    "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: Hannes Reinecke <hare@...e.com>,
    Michael Schmitz <schmitzmic@...il.com>,
    Ondrej Zary <linux@...y.sk>,
    Stan Johnson <userm57@...oo.com>,
    linux-scsi@...r.kernel.org,
    linux-kernel@...r.kernel.org
Subject: [PATCH 05/11] scsi: mac_scsi: Enable scatter/gather by default

Now that FLAG_DMA_FIXUP has itself been fixed up, it can be used to enable
scatter/gather. Increase the default value for sg_tablesize to SG_ALL
for those systems which are compatible with FLAG_DMA_FIXUP.

Tested-by: Stan Johnson <userm57@...oo.com>
Signed-off-by: Finn Thain <fthain@...ux-m68k.org>
---
 drivers/scsi/mac_scsi.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/mac_scsi.c b/drivers/scsi/mac_scsi.c
index 2e9fad1e3069..6ab7d82c9a99 100644
--- a/drivers/scsi/mac_scsi.c
+++ b/drivers/scsi/mac_scsi.c
@@ -432,7 +432,7 @@ static struct scsi_host_template mac_scsi_template = {
 	.eh_host_reset_handler	= macscsi_host_reset,
 	.can_queue		= 16,
 	.this_id		= 7,
-	.sg_tablesize		= 1,
+	.sg_tablesize		= SG_ALL,
 	.cmd_per_lun		= 2,
 	.dma_boundary		= PAGE_SIZE - 1,
 	.cmd_size		= sizeof(struct NCR5380_cmd),
@@ -470,6 +470,9 @@ static int __init mac_scsi_probe(struct platform_device *pdev)
 	if (setup_hostid >= 0)
 		mac_scsi_template.this_id = setup_hostid & 7;
 
+	if (macintosh_config->ident == MAC_MODEL_IIFX)
+		mac_scsi_template.sg_tablesize = 1;
+
 	instance = scsi_host_alloc(&mac_scsi_template,
 	                           sizeof(struct NCR5380_hostdata));
 	if (!instance)
@@ -491,6 +494,9 @@ static int __init mac_scsi_probe(struct platform_device *pdev)
 
 	host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
 
+	if (instance->sg_tablesize > 1)
+		host_flags |= FLAG_DMA_FIXUP;
+
 	error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
 	if (error)
 		goto fail_init;
-- 
2.39.5