82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/* $OpenBSD: dma_alloc.c,v 1.13 2016/09/15 02:00:16 dlg Exp $ */
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/*
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* Copyright (c) 2010 Theo de Raadt <deraadt@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/pool.h>
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#include <uvm/uvm_extern.h>
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static __inline int dma_alloc_index(size_t size);
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/* Create dma pools from objects sized 2^4 to 2^16 */
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#define DMA_PAGE_SHIFT 16
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#define DMA_BUCKET_OFFSET 4
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static char dmanames[DMA_PAGE_SHIFT - DMA_BUCKET_OFFSET + 1][10];
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struct pool dmapools[DMA_PAGE_SHIFT - DMA_BUCKET_OFFSET + 1];
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void
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dma_alloc_init(void)
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{
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int i;
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for (i = 0; i < nitems(dmapools); i++) {
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snprintf(dmanames[i], sizeof(dmanames[0]), "dma%d",
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1 << (i + DMA_BUCKET_OFFSET));
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pool_init(&dmapools[i], 1 << (i + DMA_BUCKET_OFFSET), 0,
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IPL_VM, 0, dmanames[i], NULL);
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pool_set_constraints(&dmapools[i], &kp_dma_contig);
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/* XXX need pool_setlowat(&dmapools[i], dmalowat); */
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}
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}
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static __inline int
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dma_alloc_index(size_t sz)
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{
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int b;
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for (b = 0; b < nitems(dmapools); b++)
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if (sz <= (1 << (b + DMA_BUCKET_OFFSET)))
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return (b);
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#ifdef DEBUG
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printf("dma_alloc/free: object %zd too large\n", sz);
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#endif
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return (-1);
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}
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void *
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dma_alloc(size_t size, int prflags)
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{
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int pi = dma_alloc_index(size);
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if (pi == -1)
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return (NULL);
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return pool_get(&dmapools[pi], prflags);
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}
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void
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dma_free(void *m, size_t size)
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{
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int pi = dma_alloc_index(size);
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if (pi == -1)
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return;
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pool_put(&dmapools[pi], m);
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}
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