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/*-
* 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"
/*
* Allocate a physically contiguous DMA-accessible consistent
* memory block.
*/
drm_dma_handle_t *
drm_pci_alloc(bus_dma_tag_t dmat, size_t size, size_t align,
dma_addr_t maxaddr)
{
drm_dma_handle_t *dmah;
int ret, nsegs;
/* Need power-of-two alignment, so fail the allocation if it isn't. */
if ((align & (align - 1)) != 0) {
DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
(int)align);
return NULL;
}
dmah = drm_alloc(sizeof(*dmah), DRM_MEM_DMA);
if (dmah == NULL)
return NULL;
if (bus_dmamap_create(dmat, size, 1, size, 0,
BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &dmah->dmamap) != 0)
goto dmahfree;
if (bus_dmamem_alloc(dmat, size, align, 0,
&dmah->seg, 1, &nsegs, BUS_DMA_NOWAIT) != 0) {
DRM_ERROR("bus_dmamem_alloc(%zd, %zd) returned %d\n",
size, align, ret);
goto destroy;
}
if (nsegs != 1) {
DRM_ERROR("bus_dmamem_alloc(%zd) returned %d segments\n",
size, nsegs);
goto free;
}
if (bus_dmamem_map(dmat, &dmah->seg, 1, size,
(caddr_t*)&dmah->addr, BUS_DMA_NOWAIT) != 0) {
DRM_ERROR("bus_dmamem_map() failed %d\n", ret);
goto free;
}
if (bus_dmamap_load(dmat, dmah->dmamap, dmah->addr, size,
NULL, BUS_DMA_NOWAIT) != 0)
goto unmap;
dmah->busaddr = dmah->dmamap->dm_segs[0].ds_addr;
dmah->vaddr = dmah->addr;
dmah->size = size;
return dmah;
unmap:
bus_dmamem_unmap(dmat, dmah->addr, size);
free:
bus_dmamem_free(dmat, &dmah->seg, 1);
destroy:
bus_dmamap_destroy(dmat, dmah->dmamap);
dmahfree:
drm_free(dmah, sizeof(*dmah), DRM_MEM_DMA);
return (NULL);
}
/*
* Free a DMA-accessible consistent memory block.
*/
void
drm_pci_free(bus_dma_tag_t dmat, drm_dma_handle_t *dmah)
{
if (dmah == NULL)
return;
bus_dmamap_unload(dmat, dmah->dmamap);
bus_dmamem_unmap(dmat, dmah->vaddr, dmah->size);
bus_dmamem_free(dmat, &dmah->seg, 1);
bus_dmamap_destroy(dmat, dmah->dmamap);
drm_free(dmah, sizeof(*dmah), DRM_MEM_DMA);
}
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