Revamp the busdma implementation a bit:

- change the IOMMU support code so that it supports overcommittting the
  available DVMA memory, while still allocating as lazily as possible.
  This is achieved by limiting the preallocation, and deferring the
  allocation to map load time when it fails. In the latter case, the
  DVMA memory reserved for unloaded maps can be stolen to free up enough
  memory for loading a map.
- allow NULL settings in the method tables, and search the parent tags
  until an appropriate implementation is found. This allows to remove some
  kluges in the old implementation.

1 files changed, 47 insertions, 0 deletions

diff --git a/sys/sparc64/include/bus_private.h b/sys/sparc64/include/bus_private.h
new file mode 100644
index 0000000..3af8264
--- /dev/null
+++ b/sys/sparc64/include/bus_private.h
@@ -0,0 +1,47 @@
+/*-
+ * Copyright (c) 1997, 1998 Justin T. Gibbs.
+ * Copyright (c) 2002 by Thomas Moestl <tmm@FreeBSD.org>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	from: FreeBSD: src/sys/i386/i386/busdma_machdep.c,v 1.25 2002/01/05
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_MACHINE_BUS_PRIVATE_H_
+#define	_MACHINE_BUS_PRIVATE_H_
+
+#include <sys/queue.h>
+
+struct bus_dmamap {
+	bus_dma_tag_t	dmat;
+	void		*buf;		/* unmapped buffer pointer */
+	bus_size_t	buflen;		/* unmapped buffer length */
+	bus_addr_t	start;		/* start of mapped region */
+	struct resource *res;		/* associated resource */
+	bus_size_t	dvmaresv;	/* reseved DVMA memory */
+	STAILQ_ENTRY(bus_dmamap)	maplruq;
+	int		onq;
+};
+
+#endif /* !_MACHINE_BUS_PRIVATE_H_ */