80620a83a7
sd3(mpt0:0:1:0): unable to allocate scsipi_xfer sd3: not queued, error 12 Havard Eidnes's analysis of this problem is that the scsipi_xfer pool is competing for resources with other pools, including the the inode and vnode pools which can grow quite large. *_scsipi_cmd(): don't biodone the buffer if scsipi_make_xs() fails, let the caller deal with the problem start function of block devices drivers: dequeue the buffer after the scsipi_command() call. If scsipi_command() fails with ENOMEM don't dequeue the buffer, and schedule a callout to call the start function after some delay. scsipi_init(): prime the scsipi_xfer_pool with one page. This ensure that there is always some scsipi_xfer to play with. If scsipi_command() fails because of pool_get(), we're sure there will be resources available later, when the pending commands have completed. Reviewed by Jason Thorpe and Havard Eidnes. Todo: remove the "unable to allocate scsipi_xfer" and "not queued, error %d" printfs, but I choose to keep them for now, to help make sure the code does what it should.
88 lines
3.6 KiB
C
88 lines
3.6 KiB
C
/* $NetBSD: ssvar.h,v 1.12 2004/08/27 20:37:29 bouyer Exp $ */
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/*
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* Copyright (c) 1995 Kenneth Stailey. All rights reserved.
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* modified for configurable scanner support by Joachim Koenig
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Kenneth Stailey.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* SCSI scanner interface description
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*/
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/*
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* Special handlers for impractically different scanner types.
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* Register NULL for a function if you want to try the real SCSI code
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* (with quirks table)
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*/
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struct ss_softc;
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struct scan_io;
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struct ss_special {
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int (*set_params)(struct ss_softc *, struct scan_io *);
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int (*trigger_scanner)(struct ss_softc *);
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int (*get_params)(struct ss_softc *);
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/* some scanners only send line-multiples */
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void (*minphys)(struct ss_softc *, struct buf *);
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int (*read)(struct ss_softc *, struct buf *);
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int (*rewind_scanner)(struct ss_softc *);
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int (*load_adf)(struct ss_softc *);
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int (*unload_adf)(struct ss_softc *);
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};
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/*
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* ss_softc has to be declared here, because the device dependant
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* modules include it
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*/
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struct ss_softc {
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struct device sc_dev;
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int flags;
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#define SSF_TRIGGERED 0x01 /* read operation has been primed */
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#define SSF_LOADED 0x02 /* parameters loaded */
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#define SSF_AUTOCONF 0x04 /* set during auto-configuration */
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struct scsipi_periph *sc_periph; /* contains our targ, lun, etc. */
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struct scan_io sio;
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struct bufq_state buf_queue; /* the queue of pending IO operations */
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struct callout sc_callout; /* to restart the buf queue */
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u_int quirks; /* scanner is only mildly twisted */
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#define SS_Q_GET_BUFFER_SIZE 0x0001 /* poll for available data in ssread() */
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/* truncate to byte boundary is assumed by default unless one of these is set */
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#define SS_Q_PAD_TO_BYTE 0x0002 /* pad monochrome data to byte boundary */
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#define SS_Q_PAD_TO_WORD 0x0004 /* pad monochrome data to word boundary */
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#define SS_Q_THRESHOLD_FOLLOWS_BRIGHTNESS 0x0008
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struct ss_special *special; /* special handlers for spec. devices */
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};
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void ssrestart(void *);
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/*
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* define the special attach routines if configured
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*/
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void mustek_attach(struct ss_softc *, struct scsipibus_attach_args *);
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void scanjet_attach(struct ss_softc *, struct scsipibus_attach_args *);
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