From 9eb6f10995f919a6bec660a31a8994c75be57950 Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Thu, 29 Jun 2017 08:20:22 +0800
Subject: [PATCH] busdma: Add bus_dmamap_load_ccb; ease driver porting from
 FreeBSD.

---
 sys/platform/pc64/x86_64/busdma_machdep.c | 18 ++++++++++++++++++
 sys/sys/bus_dma.h                         |  8 ++++++++
 2 files changed, 26 insertions(+)

diff --git a/sys/platform/pc64/x86_64/busdma_machdep.c b/sys/platform/pc64/x86_64/busdma_machdep.c
index 09e2e78194..884b3ffbb2 100644
--- a/sys/platform/pc64/x86_64/busdma_machdep.c
+++ b/sys/platform/pc64/x86_64/busdma_machdep.c
@@ -49,6 +49,9 @@
 
 #include <machine/md_var.h>
 
+#include <bus/cam/cam.h>
+#include <bus/cam/cam_ccb.h>
+
 #define MAX_BPAGES	1024
 
 /*
@@ -842,6 +845,21 @@ bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
 	return 0;
 }
 
+int
+bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb,
+    bus_dmamap_callback_t *callback, void *callback_arg, int flags)
+{
+	const struct ccb_scsiio *csio;
+
+	KASSERT(ccb->ccb_h.func_code == XPT_SCSI_IO ||
+	    ccb->ccb_h.func_code == XPT_CONT_TARGET_IO,
+	    ("invalid ccb func_code %u", ccb->ccb_h.func_code));
+	csio = &ccb->csio;
+
+	return (bus_dmamap_load(dmat, map, csio->data_ptr, csio->dxfer_len,
+	    callback, callback_arg, flags));
+}
+
 /*
  * Like _bus_dmamap_load(), but for mbufs.
  */
diff --git a/sys/sys/bus_dma.h b/sys/sys/bus_dma.h
index 348078ea67..dbedbdfd8b 100644
--- a/sys/sys/bus_dma.h
+++ b/sys/sys/bus_dma.h
@@ -106,6 +106,7 @@
 /* Forwards needed by prototypes below. */
 struct mbuf;
 struct uio;
+union ccb;
 
 /*
  *	bus_dmasync_op_t
@@ -251,6 +252,13 @@ int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map,
 			struct uio *ui,
 			bus_dmamap_callback2_t *callback, void *callback_arg,
 			int flags);
+/*
+ * Like bus_dmamap_load but for ccb.
+ */
+int bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map,
+			union ccb *ccb,
+			bus_dmamap_callback_t *callback, void *callback_arg,
+			int flags);
 
 /*
  * Like bus_dmamap_load_mbuf without callback.
-- 
2.11.4.GIT