Add PCI DMA memory functions and make addbufs_pci and associated code use

    it. To do this we need to save the bus address along with the virtual
    address in the seglist. Also fix some error handling and a few bits of
    whitespace.

1 files changed, 65 insertions, 0 deletions

diff --git a/bsd-core/drm_pci.c b/bsd-core/drm_pci.c
new file mode 100644
index 00000000..aa065b64
--- /dev/null
+++ b/bsd-core/drm_pci.c
@@ -0,0 +1,65 @@
+/**
+ * \file drm_pci.h
+ * \brief PCI consistent, DMA-accessible memory functions.
+ *
+ * \author Eric Anholt <anholt@FreeBSD.org>
+ */
+
+/*
+ * Copyright 2003 Eric Anholt.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "drmP.h"
+
+/**********************************************************************/
+/** \name PCI memory */
+/*@{*/
+
+/**
+ * \brief Allocate a physically contiguous DMA-accessible consistent 
+ * memory block.
+ */
+void *
+DRM(pci_alloc)(drm_device_t *dev, size_t size, size_t align, dma_addr_t maxaddr,
+    dma_addr_t *busaddr)
+{
+	void *vaddr;
+
+	vaddr = contigmalloc(size, DRM(M_DRM), M_WAITOK, 0ul, maxaddr, align,
+	    0);
+	*busaddr = vtophys(vaddr);
+	
+	return vaddr;
+}
+
+/**
+ * \brief Free a DMA-accessible consistent memory block.
+ */
+void
+DRM(pci_free)(drm_device_t *dev, size_t size, void *vaddr, dma_addr_t busaddr)
+{
+#if __FreeBSD_version > 500000
+	contigfree(vaddr, size, DRM(M_DRM));	/* Not available on 4.x */
+#endif
+}
+
+/*@}*/