164 lines
6.0 KiB
C
164 lines
6.0 KiB
C
/*-
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* Copyright (c) 2000 Michael Smith
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* Copyright (c) 2000 BSDi
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* All rights reserved.
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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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* $FreeBSD$
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*/
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#ifdef TWE_DEBUG
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#define debug(level, fmt, args...) do { if (level <= TWE_DEBUG) printf("%s: " fmt "\n", __FUNCTION__ , ##args); } while(0)
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#define debug_called(level) do { if (level <= TWE_DEBUG) printf(__FUNCTION__ ": called\n"); } while(0)
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#else
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#define debug(level, fmt, args...)
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#define debug_called(level)
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#endif
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/*
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* Structure describing a logical unit as attached to the controller
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*/
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struct twe_drive
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{
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/* unit properties */
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u_int32_t td_size;
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int td_cylinders;
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int td_heads;
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int td_sectors;
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int td_unit;
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/* unit state */
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int td_state;
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#define TWE_DRIVE_READY 0
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#define TWE_DRIVE_DEGRADED 1
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#define TWE_DRIVE_OFFLINE 2
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int td_raidlevel;
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#define TWE_DRIVE_RAID0 0
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#define TWE_DRIVE_RAID1 1
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#define TWE_DRIVE_UNKNOWN 0xff
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/* handle for attached driver */
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device_t td_disk;
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};
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/*
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* Per-command control structure.
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*
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* Note that due to alignment constraints on the tc_command field, this *must* be 64-byte aligned.
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* We achieve this by placing the command at the beginning of the structure, and using malloc()
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* to allocate each structure.
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*/
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struct twe_request
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{
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/* controller command */
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TWE_Command tr_command; /* command as submitted to controller */
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bus_dmamap_t tr_cmdmap; /* DMA map for command */
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u_int32_t tr_cmdphys; /* address of command in controller space */
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/* command payload */
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void *tr_data; /* data buffer */
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void *tr_realdata; /* copy of real data buffer pointer for alignment fixup */
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size_t tr_length;
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bus_dmamap_t tr_dmamap; /* DMA map for data */
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u_int32_t tr_dataphys; /* data buffer base address in controller space */
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TAILQ_ENTRY(twe_request) tr_link; /* list linkage */
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struct twe_softc *tr_sc; /* controller that owns us */
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int tr_status; /* command status */
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#define TWE_CMD_SETUP 0 /* being assembled */
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#define TWE_CMD_BUSY 1 /* submitted to controller */
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#define TWE_CMD_COMPLETE 2 /* completed by controller (maybe with error) */
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#define TWE_CMD_FAILED 3 /* failed submission to controller */
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int tr_flags;
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#define TWE_CMD_DATAIN (1<<0)
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#define TWE_CMD_DATAOUT (1<<1)
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#define TWE_CMD_ALIGNBUF (1<<2) /* data in bio is misaligned, have to copy to/from private buffer */
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void (* tr_complete)(struct twe_request *tr); /* completion handler */
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void *tr_private; /* submitter-private data or wait channel */
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};
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/*
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* Per-controller state.
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*/
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struct twe_softc
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{
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/* bus connections */
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device_t twe_dev;
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dev_t twe_dev_t;
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struct resource *twe_io; /* register interface window */
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bus_space_handle_t twe_bhandle; /* bus space handle */
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bus_space_tag_t twe_btag; /* bus space tag */
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bus_dma_tag_t twe_parent_dmat; /* parent DMA tag */
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bus_dma_tag_t twe_buffer_dmat; /* data buffer DMA tag */
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struct resource *twe_irq; /* interrupt */
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void *twe_intr; /* interrupt handle */
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/* controller queues and arrays */
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TAILQ_HEAD(, twe_request) twe_freecmds; /* command structures available for reuse */
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TAILQ_HEAD(, twe_request) twe_work; /* active commands (busy or waiting for completion) */
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struct twe_request *twe_cmdlookup[TWE_Q_LENGTH]; /* busy commands indexed by request ID */
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int twe_busycmds; /* count of busy commands */
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struct twe_drive twe_drive[TWE_MAX_UNITS]; /* attached drives */
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struct bio_queue_head twe_bioq; /* outstanding I/O operations */
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struct twe_request *twe_deferred; /* request that the controller wouldn't take */
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u_int16_t twe_aen_queue[TWE_Q_LENGTH]; /* AENs queued for userland tool(s) */
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int twe_aen_head, twe_aen_tail; /* ringbuffer pointers for AEN queue */
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/* controller status */
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int twe_state;
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#define TWE_STATE_INTEN (1<<0) /* interrupts have been enabled */
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#define TWE_STATE_SHUTDOWN (1<<1) /* controller is shut down */
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#define TWE_STATE_OPEN (1<<2) /* control device is open */
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#define TWE_STATE_SUSPEND (1<<3) /* controller is suspended */
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/* delayed configuration hook */
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struct intr_config_hook twe_ich;
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/* wait-for-aen notification */
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int twe_wait_aen;
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};
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/*
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* Virtual disk driver.
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*/
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struct twed_softc
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{
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device_t twed_dev;
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dev_t twed_dev_t;
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struct twe_softc *twed_controller; /* parent device softc */
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struct twe_drive *twed_drive; /* drive data in parent softc */
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struct disk twed_disk; /* generic disk handle */
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struct devstat twed_stats; /* accounting */
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struct disklabel twed_label; /* synthetic label */
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int twed_flags;
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#define TWED_OPEN (1<<0) /* drive is open (can't shut down) */
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};
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/*
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* Interface betwen driver core and disk driver (should be using a bus?)
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*/
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extern int twe_submit_buf(struct twe_softc *sc, struct bio *bp);
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extern void twed_intr(void *data);
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