Add small command queue to reduce latency between ld driver and
sdmmc I/O thread.
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814eb59767
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@ -1,4 +1,4 @@
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/* $NetBSD: ld_sdmmc.c,v 1.19 2015/08/03 10:09:08 jmcneill Exp $ */
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/* $NetBSD: ld_sdmmc.c,v 1.20 2015/08/09 13:49:18 mlelstv Exp $ */
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/*
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* Copyright (c) 2008 KIYOHARA Takashi
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@ -28,7 +28,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ld_sdmmc.c,v 1.19 2015/08/03 10:09:08 jmcneill Exp $");
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__KERNEL_RCSID(0, "$NetBSD: ld_sdmmc.c,v 1.20 2015/08/09 13:49:18 mlelstv Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_sdmmc.h"
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@ -71,7 +71,9 @@ struct ld_sdmmc_softc {
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int sc_hwunit;
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struct sdmmc_function *sc_sf;
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struct ld_sdmmc_task sc_task;
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#define LD_SDMMC_MAXQUEUECNT 4
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struct ld_sdmmc_task sc_task[LD_SDMMC_MAXQUEUECNT];
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int sc_nexttask;
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};
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static int ld_sdmmc_match(device_t, cfdata_t, void *);
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@ -115,6 +117,8 @@ ld_sdmmc_attach(device_t parent, device_t self, void *aux)
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sa->sf->cid.rev, sa->sf->cid.psn, sa->sf->cid.mdt);
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aprint_naive("\n");
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sc->sc_nexttask = 0;
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sc->sc_hwunit = 0; /* always 0? */
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sc->sc_sf = sa->sf;
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@ -122,7 +126,7 @@ ld_sdmmc_attach(device_t parent, device_t self, void *aux)
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ld->sc_secperunit = sc->sc_sf->csd.capacity;
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ld->sc_secsize = SDMMC_SECTOR_SIZE;
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ld->sc_maxxfer = MAXPHYS;
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ld->sc_maxqueuecnt = 1;
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ld->sc_maxqueuecnt = LD_SDMMC_MAXQUEUECNT;
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ld->sc_dump = ld_sdmmc_dump;
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ld->sc_start = ld_sdmmc_start;
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@ -175,7 +179,9 @@ static int
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ld_sdmmc_start(struct ld_softc *ld, struct buf *bp)
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{
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struct ld_sdmmc_softc *sc = device_private(ld->sc_dv);
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struct ld_sdmmc_task *task = &sc->sc_task;
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struct ld_sdmmc_task *task = &sc->sc_task[sc->sc_nexttask];
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sc->sc_nexttask = (sc->sc_nexttask + 1) % LD_SDMMC_MAXQUEUECNT;
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task->task_sc = sc;
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task->task_bp = bp;
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