Author: jhb
Date: Mon Aug 6 19:49:57 2012
New Revision: 239103
URL: http://svn.freebsd.org/changeset/base/239103
Log:
Explicitly enable busmastering on PCI-PCI bridges. Transactions initiated
on the secondary side of a bridge will not be propagated to the primary
bus unless this is enabled. Busmastering is not enabled by default (we
have relied on firmware to set this bit to date). The OS needs to set it
for any bridges not configured by system firmware.
Tested by: Steve Polyack korvus comcast net
MFC after: 2 weeks
Modified:
head/sys/dev/pci/pci_pci.c
Modified: head/sys/dev/pci/pci_pci.c
==============================================================================
--- head/sys/dev/pci/pci_pci.c Mon Aug 6 18:54:17 2012 (r239102)
+++ head/sys/dev/pci/pci_pci.c Mon Aug 6 19:49:57 2012 (r239103)
@@ -683,6 +683,13 @@ pcib_attach_common(device_t dev)
* would be more widely routed than absolutely necessary. We could
* then do a walk of the tree later and fix it.
*/
+
+ /*
+ * Always enable busmastering on bridges so that transactions
+ * initiated on the secondary bus are passed through to the
+ * primary bus.
+ */
+ pci_enable_busmaster(dev);
}
int
_______________________________________________
svn-src-head@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
