3 * \brief PCI consistent, DMA-accessible memory functions.
5 * \author Eric Anholt <anholt@FreeBSD.org>
9 * Copyright 2003 Eric Anholt.
10 * All Rights Reserved.
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice (including the next
20 * paragraph) shall be included in all copies or substantial portions of the
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
26 * AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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28 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include "dev/drm/drmP.h"
36 /**********************************************************************/
37 /** \name PCI memory */
40 #if defined(__FreeBSD__)
42 drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
44 drm_dma_handle_t *dmah = arg;
49 KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
50 dmah->busaddr = segs[0].ds_addr;
55 * \brief Allocate a physically contiguous DMA-accessible consistent
59 drm_pci_alloc(drm_device_t *dev, size_t size, size_t align, dma_addr_t maxaddr)
61 drm_dma_handle_t *dmah;
64 /* Need power-of-two alignment, so fail the allocation if it isn't. */
65 if ((align & (align - 1)) != 0) {
66 DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
71 dmah = malloc(sizeof(drm_dma_handle_t), M_DRM, M_ZERO | M_NOWAIT);
76 ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */
77 maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
78 NULL, NULL, /* filtfunc, filtfuncargs */
79 size, 1, size, /* maxsize, nsegs, maxsegsize */
80 BUS_DMA_ALLOCNOW, NULL, NULL, /* flags, lockfunc, lockfuncargs */
87 ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, BUS_DMA_NOWAIT,
90 bus_dma_tag_destroy(dmah->tag);
95 ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
96 drm_pci_busdma_callback, dmah, 0);
98 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
99 bus_dma_tag_destroy(dmah->tag);
103 #elif defined(__NetBSD__)
104 ret = bus_dmamem_alloc(dev->dma_tag, size, align, PAGE_SIZE,
105 &dmah->seg, 1, &nsegs, BUS_DMA_NOWAIT);
106 if ((ret != 0) || (nsegs != 1)) {
111 ret = bus_dmamem_map(dev->dma_tag, &dmah->seg, 1, size, &dmah->addr,
114 bus_dmamem_free(dev->dma_tag, &dmah->seg, 1);
119 dmah->dmaaddr = h->seg.ds_addr;
126 * \brief Free a DMA-accessible consistent memory block.
129 drm_pci_free(drm_device_t *dev, drm_dma_handle_t *dmah)
134 #if defined(__FreeBSD__)
135 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
136 bus_dma_tag_destroy(dmah->tag);
137 #elif defined(__NetBSD__)
138 bus_dmamem_free(dev->dma_tag, &dmah->seg, 1);