MFC r257230:

Add a virtual table for the busdma methods on x86, to allow different
busdma implementations to coexist.

1 files changed, 97 insertions, 0 deletions

diff --git a/sys/x86/include/busdma_impl.h b/sys/x86/include/busdma_impl.h
new file mode 100644
index 0000000..70c9a6f
--- /dev/null
+++ b/sys/x86/include/busdma_impl.h
@@ -0,0 +1,97 @@
+/*-
+ * Copyright (c) 2013 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * 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 AND CONTRIBUTORS ``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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	__X86_BUSDMA_IMPL_H
+#define	__X86_BUSDMA_IMPL_H
+
+struct bus_dma_tag_common {
+	struct bus_dma_impl *impl;
+	struct bus_dma_tag_common *parent;
+	bus_size_t	  alignment;
+	bus_addr_t	  boundary;
+	bus_addr_t	  lowaddr;
+	bus_addr_t	  highaddr;
+	bus_dma_filter_t *filter;
+	void		 *filterarg;
+	bus_size_t	  maxsize;
+	u_int		  nsegments;
+	bus_size_t	  maxsegsz;
+	int		  flags;
+	bus_dma_lock_t	 *lockfunc;
+	void		 *lockfuncarg;
+	int		  ref_count;
+};
+
+struct bus_dma_impl {
+	int (*tag_create)(bus_dma_tag_t parent,
+	    bus_size_t alignment, bus_addr_t boundary, bus_addr_t lowaddr,
+	    bus_addr_t highaddr, bus_dma_filter_t *filter,
+	    void *filterarg, bus_size_t maxsize, int nsegments,
+	    bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
+	    void *lockfuncarg, bus_dma_tag_t *dmat);
+	int (*tag_destroy)(bus_dma_tag_t dmat);
+	int (*map_create)(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp);
+	int (*map_destroy)(bus_dma_tag_t dmat, bus_dmamap_t map);
+	int (*mem_alloc)(bus_dma_tag_t dmat, void** vaddr, int flags,
+	    bus_dmamap_t *mapp);
+	void (*mem_free)(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);
+	int (*load_ma)(bus_dma_tag_t dmat, bus_dmamap_t map,
+	    struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
+	    bus_dma_segment_t *segs, int *segp);
+	int (*load_phys)(bus_dma_tag_t dmat, bus_dmamap_t map,
+	    vm_paddr_t buf, bus_size_t buflen, int flags,
+	    bus_dma_segment_t *segs, int *segp);
+	int (*load_buffer)(bus_dma_tag_t dmat, bus_dmamap_t map,
+	    void *buf, bus_size_t buflen, pmap_t pmap, int flags,
+	    bus_dma_segment_t *segs, int *segp);
+	void (*map_waitok)(bus_dma_tag_t dmat, bus_dmamap_t map,
+	    struct memdesc *mem, bus_dmamap_callback_t *callback,
+	    void *callback_arg);
+	bus_dma_segment_t *(*map_complete)(bus_dma_tag_t dmat, bus_dmamap_t map,
+	    bus_dma_segment_t *segs, int nsegs, int error);
+	void (*map_unload)(bus_dma_tag_t dmat, bus_dmamap_t map);
+	void (*map_sync)(bus_dma_tag_t dmat, bus_dmamap_t map,
+	    bus_dmasync_op_t op);
+};
+
+void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op);
+void bus_dma_dflt_lock(void *arg, bus_dma_lock_op_t op);
+int bus_dma_run_filter(struct bus_dma_tag_common *dmat, bus_addr_t paddr);
+int common_bus_dma_tag_create(struct bus_dma_tag_common *parent,
+    bus_size_t alignment,
+    bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
+    bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
+    int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
+    void *lockfuncarg, size_t sz, void **dmat);
+
+extern struct bus_dma_impl bus_dma_bounce_impl;
+
+#endif