Add work-in-progress of NetBSD-specific code. I will be committing a lot
more changes shortly (as soon as I work out the mmap offset insanity).
This commit is contained in:
bjs
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/* $NetBSD: drm_netbsd.c,v 1.1 2008/05/28 04:52:48 bjs Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Blair Sadewitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <dev/drm/drmP.h>
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/* XXX Most everything the DRM wants is expressed in pages. There are possible
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scenarios where e.g. the page size does not equal the page size of the GART,
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but our DRM does not work on those platforms yet. */
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struct drm_dmamem *
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drm_dmamem_pgalloc(drm_device_t *dev, size_t pages)
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{
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struct drm_dmamem *mem = NULL;
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size_t size = pages << PAGE_SHIFT;
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int ret = 0;
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mem = malloc(sizeof(*mem), M_DRM, M_NOWAIT | M_ZERO);
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if (mem == NULL)
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return NULL;
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mem->phase = 0;
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mem->dd_segs = malloc(sizeof(*mem->dd_segs) * pages, M_DRM,
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M_NOWAIT | M_ZERO);
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if (mem->dd_segs == NULL)
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goto error;
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mem->dd_dmat = dev->pa.pa_dmat;
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mem->dd_size = size;
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if (bus_dmamap_create(dev->pa.pa_dmat, size, pages, PAGE_SIZE, 0,
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BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &mem->dd_dmam) != 0)
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goto error;
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mem->phase++;
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if ((ret = bus_dmamem_alloc(dev->pa.pa_dmat, size, PAGE_SIZE, 0,
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mem->dd_segs, pages, &mem->dd_nsegs, BUS_DMA_NOWAIT)) != 0) {
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goto error;
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}
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mem->phase++;
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if (bus_dmamem_map(dev->pa.pa_dmat, mem->dd_segs, mem->dd_nsegs, size,
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&mem->dd_kva, BUS_DMA_COHERENT|BUS_DMA_NOWAIT) != 0)
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goto error;
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mem->phase++;
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if (bus_dmamap_load(dev->pa.pa_dmat, mem->dd_dmam, mem->dd_kva, size,
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NULL, BUS_DMA_NOWAIT) != 0)
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goto error;
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mem->phase++;
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memset(mem->dd_kva, 0, size);
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return mem;
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error:
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DRM_DEBUG("allocation failed; teardown sequence follows:\n");
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drm_dmamem_free(mem);
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return NULL;
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}
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void
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drm_dmamem_free(struct drm_dmamem *mem)
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{
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if (mem == NULL) {
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return;
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}
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switch (mem->phase) {
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case DRM_DMAMAP_LOAD:
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DRM_DEBUG("bus_dmamap_unload: tag (%p), map (%p)\n",
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(void *)mem->dd_dmat, (void *)mem->dd_dmam);
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bus_dmamap_unload(mem->dd_dmat, mem->dd_dmam);
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/* FALLTHRU */
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case DRM_DMAMEM_MAP:
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DRM_DEBUG("bus_dmamem_unmap: tag (%p), kva (%p), size (%zd)\n",
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mem->dd_dmat, mem->dd_kva, mem->dd_size);
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bus_dmamem_unmap(mem->dd_dmat, mem->dd_kva, mem->dd_size);
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/* FALLTHRU */
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case DRM_DMAMEM_ALLOC:
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DRM_DEBUG("bus_dmamem_free: tag (%p), segs (%p), nsegs (%i)\n",
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mem->dd_dmat, mem->dd_segs, mem->dd_nsegs);
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bus_dmamem_free(mem->dd_dmat, mem->dd_segs,
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mem->dd_nsegs);
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/* FALLTHRU */
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case DRM_DMAMAP_CREATE:
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DRM_DEBUG("bus_dmamap_destroy: tag (%p), map (%p)\n",
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(void *)mem->dd_dmat, (void *)mem->dd_dmam);
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bus_dmamap_destroy(mem->dd_dmat, mem->dd_dmam);
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/* FALLTHRU */
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case DRM_DMAMEM_INIT:
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if (mem->dd_segs != NULL) {
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free(mem->dd_segs, M_DRM);
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mem->dd_segs = NULL;
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}
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break;
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}
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free(mem, M_DRM);
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mem = NULL;
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return;
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}
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@ -0,0 +1,68 @@
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/* $NetBSD: drm_netbsd.h,v 1.1 2008/05/28 04:52:48 bjs Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Blair Sadewitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef _DEV_DRM_DRMNETBSD_H_
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#define _DEV_DRM_DRMNETBSD_H_
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#include <sys/types.h>
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#include <sys/bus.h>
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#define DRM_DMAMEM_INIT 0x000
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#define DRM_DMAMAP_CREATE 0x001
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#define DRM_DMAMEM_ALLOC 0x002
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#define DRM_DMAMEM_MAP 0x004
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#define DRM_DMAMAP_LOAD 0x008
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#define DRM_DMAMEM_BUSADDR(__m) ((__m)->dd_dmam->dm_segs[0].ds_addr)
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#define DRM_DMAMEM_SEGADDR(__m, __s) ((__m)->dd_dmam->dm_segs[__s].ds_addr)
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#define DRM_DMAMEM_SEGSIZE(__m, __s) ((__m)->dd_dmam->dm_segs[__s].ds_len)
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#define DRM_DMAMEM_KERNADDR(__m) ((__m)->dd_kva)
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#define RWLOCK_CONTENTION(rwlock) do { } while (!rw_tryupgrade(rwlock))
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/* for dma_lock */
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struct drm_dmamem {
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bus_dma_tag_t dd_dmat;
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bus_dmamap_t dd_dmam;
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bus_dma_segment_t *dd_segs;
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int dd_nsegs;
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size_t dd_size;
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void *dd_kva;
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unsigned int phase;
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};
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struct drm_dmamem *drm_dmamem_pgalloc(struct drm_device *, size_t);
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void drm_dmamem_free(struct drm_dmamem *);
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#endif /* _DEV_DRM_DRMNETBSD_H_ */
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