Module Name: src
Committed By: riastradh
Date: Sun Sep 8 15:39:48 UTC 2013
Added Files:
src/sys/external/bsd/drm2/include/drm [riastradh-drm2]: bus_dma_hacks.h
Log Message:
Implement a bus_dmamem_wire_uvm_object hack.
This is fit only for x86 at the moment -- it parrots the x86
bus_dmamem_alloc code but with uvm_obj_wirepages instead of
uvm_pglistalloc.
XXX THIS IS A MEGA-KLUDGE THAT NEEDS TO BE DONE PROPERLY.
To generate a diff of this commit:
cvs rdiff -u -r0 -r1.1.2.1 \
src/sys/external/bsd/drm2/include/drm/bus_dma_hacks.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Added files:
Index: src/sys/external/bsd/drm2/include/drm/bus_dma_hacks.h
diff -u /dev/null src/sys/external/bsd/drm2/include/drm/bus_dma_hacks.h:1.1.2.1
--- /dev/null Sun Sep 8 15:39:48 2013
+++ src/sys/external/bsd/drm2/include/drm/bus_dma_hacks.h Sun Sep 8 15:39:48 2013
@@ -0,0 +1,110 @@
+/* $NetBSD: bus_dma_hacks.h,v 1.1.2.1 2013/09/08 15:39:48 riastradh Exp $ */
+
+/*-
+ * Copyright (c) 2013 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Taylor R. Campbell.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#ifndef _DRM_BUS_DMA_HACKS_H_
+#define _DRM_BUS_DMA_HACKS_H_
+
+#include <sys/cdefs.h>
+#include <sys/bus.h>
+
+#include <uvm/uvm.h>
+#include <uvm/uvm_extern.h>
+
+/* XXX This is x86-specific bollocks. */
+
+static inline int
+bus_dmamem_wire_uvm_object(bus_dma_tag_t tag, struct uvm_object *uobj,
+ off_t start, bus_size_t size, struct pglist *pages, bus_size_t alignment,
+ bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs,
+ int flags)
+{
+ struct pglist pageq;
+ struct vm_page *page;
+ bus_addr_t prev_addr, addr;
+ unsigned int i;
+ int error;
+
+ KASSERT(size <= __type_max(off_t));
+ KASSERT(start <= (__type_max(off_t) - size));
+ KASSERT(alignment == PAGE_SIZE); /* XXX */
+ KASSERT(0 < nsegs);
+
+ if (pages == NULL) {
+ TAILQ_INIT(&pageq);
+ pages = &pageq;
+ }
+
+ error = uvm_obj_wirepages(uobj, start, (start + size), pages);
+ if (error)
+ goto fail0;
+
+ page = TAILQ_FIRST(pages);
+ KASSERT(page != NULL);
+
+ addr = VM_PAGE_TO_PHYS(page);
+ segs[0].ds_addr = addr;
+ segs[0].ds_len = PAGE_SIZE;
+
+ i = 0;
+ while ((page = TAILQ_NEXT(page, pageq.queue)) != NULL) {
+ prev_addr = addr;
+ addr = VM_PAGE_TO_PHYS(page);
+ if ((addr == (prev_addr + PAGE_SIZE)) &&
+ ((addr & boundary) == (prev_addr & boundary))) {
+ segs[i].ds_len += PAGE_SIZE;
+ } else {
+ i += 1;
+ if (i >= nsegs) {
+ error = EFBIG;
+ goto fail1;
+ }
+ segs[i].ds_addr = addr;
+ segs[i].ds_len = PAGE_SIZE;
+ }
+ }
+
+ /* Success! */
+ *rsegs = (i + 1);
+ return 0;
+
+fail1: uvm_obj_unwirepages(uobj, start, (start + size));
+fail0: return error;
+}
+
+static inline void
+bus_dmamem_unwire_uvm_object(bus_dma_tag_t tag __unused,
+ struct uvm_object *uobj, off_t start, bus_size_t size,
+ bus_dma_segment_t *segs __unused, int nsegs __unused)
+{
+ uvm_obj_unwirepages(uobj, start, (start + size));
+}
+
+#endif /* _DRM_BUS_DMA_HACKS_H_ */
