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From: Alexander Motin <mav@FreeBSD.org>
Date: Thu, 9 Feb 2012 07:40:14 +0000 (UTC)
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Subject: svn commit: r231252 - stable/8/sys/cam/ata
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Author: mav
Date: Thu Feb  9 07:40:13 2012
New Revision: 231252
URL: http://svn.freebsd.org/changeset/base/231252

Log:
  MFC r230912:
  Make CAM ATA honor old hw.ata.ata_dma and hw.ata.atapi_dma tunables.
  
  Even having more specific hint.ata.X.mode controls, global ones are
  still could be useful from some points, including compatibility.
  
  PR:             kern/164651

Modified:
  stable/8/sys/cam/ata/ata_xpt.c
Directory Properties:
  stable/8/sys/   (props changed)

Modified: stable/8/sys/cam/ata/ata_xpt.c
==============================================================================
--- stable/8/sys/cam/ata/ata_xpt.c	Thu Feb  9 07:38:56 2012	(r231251)
+++ stable/8/sys/cam/ata/ata_xpt.c	Thu Feb  9 07:40:13 2012	(r231252)
@@ -186,6 +186,12 @@ static void	 ata_dev_async(u_int32_t asy
 static void	 ata_action(union ccb *start_ccb);
 static void	 ata_announce_periph(struct cam_periph *periph);
 
+static int ata_dma = 1;
+static int atapi_dma = 1;
+
+TUNABLE_INT("hw.ata.ata_dma", &ata_dma);
+TUNABLE_INT("hw.ata.atapi_dma", &atapi_dma);
+
 static struct xpt_xport ata_xport = {
 	.alloc_device = ata_alloc_device,
 	.action = ata_action,
@@ -356,6 +362,13 @@ probestart(struct cam_periph *periph, un
 			if (cts.xport_specific.sata.valid & CTS_SATA_VALID_MODE)
 				mode = cts.xport_specific.sata.mode;
 		}
+		if (periph->path->device->protocol == PROTO_ATA) {
+			if (ata_dma == 0 && (mode == 0 || mode > ATA_PIO_MAX))
+				mode = ATA_PIO_MAX;
+		} else {
+			if (atapi_dma == 0 && (mode == 0 || mode > ATA_PIO_MAX))
+				mode = ATA_PIO_MAX;
+		}
 negotiate:
 		/* Honor device capabilities. */
 		wantmode = mode = ata_max_mode(ident_buf, mode);