101869a8f0
Grab device reserved physical memory regions from FDT using standard "memory-region" property and use vmem(9) to allocate buffers from it. The same vmem could be used by DMA engine drivers to allocate memory for DMA descriptors. This is required for platforms that provide uncached memory region reserved exclusively for DMA operations. o Change sleepable sx(9) lock type to non-sleepable mutex(9) since network drivers usually hold mutex during DMA operations. So we don't take sleepable lock after non-sleepable. Tested on U.S. Government Furnished Equipment (GFE) 64-bit RISC-V cores. Sponsored by: DARPA, AFRL
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*-
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* Copyright (c) 2017-2019 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <machine/bus.h>
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#ifdef FDT
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#endif
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#include <dev/xdma/xdma.h>
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int
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xdma_dequeue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
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xdma_transfer_status_t *status)
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{
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struct xdma_request *xr;
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struct xdma_request *xr_tmp;
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QUEUE_OUT_LOCK(xchan);
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TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) {
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TAILQ_REMOVE(&xchan->queue_out, xr, xr_next);
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break;
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}
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QUEUE_OUT_UNLOCK(xchan);
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if (xr == NULL)
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return (-1);
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*mp = xr->m;
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status->error = xr->status.error;
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status->transferred = xr->status.transferred;
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xchan_bank_put(xchan, xr);
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return (0);
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}
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int
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xdma_enqueue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
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uintptr_t addr, uint8_t src_width, uint8_t dst_width,
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enum xdma_direction dir)
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{
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struct xdma_request *xr;
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xdma_controller_t *xdma;
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xdma = xchan->xdma;
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xr = xchan_bank_get(xchan);
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if (xr == NULL)
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return (-1); /* No space is available yet. */
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xr->direction = dir;
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xr->m = *mp;
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xr->req_type = XR_TYPE_MBUF;
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if (dir == XDMA_MEM_TO_DEV) {
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xr->dst_addr = addr;
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xr->src_addr = 0;
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} else {
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xr->src_addr = addr;
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xr->dst_addr = 0;
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}
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xr->src_width = src_width;
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xr->dst_width = dst_width;
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QUEUE_IN_LOCK(xchan);
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TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next);
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QUEUE_IN_UNLOCK(xchan);
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return (0);
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}
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uint32_t
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xdma_mbuf_chain_count(struct mbuf *m0)
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{
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struct mbuf *m;
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uint32_t c;
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c = 0;
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for (m = m0; m != NULL; m = m->m_next)
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c++;
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return (c);
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}
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uint32_t
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xdma_mbuf_defrag(xdma_channel_t *xchan, struct xdma_request *xr)
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{
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xdma_controller_t *xdma;
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struct mbuf *m;
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uint32_t c;
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xdma = xchan->xdma;
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c = xdma_mbuf_chain_count(xr->m);
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if (c == 1)
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return (c); /* Nothing to do. */
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if ((m = m_defrag(xr->m, M_NOWAIT)) == NULL) {
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device_printf(xdma->dma_dev,
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"%s: Can't defrag mbuf\n",
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__func__);
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return (c);
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}
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xr->m = m;
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c = 1;
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return (c);
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}
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