7f4d10be2c
and fixing some major bugs. - Add support for the v5 firmware interface, used by the DAC1164P (tested) and AcceleRAID 352 (untested but should work). We now cover all of the Mylex family's protocols except for v2 (used by EISA and Alpha-compatible cards). - Fix an accounting bug which resulted in endless 'poll still busy' messages. In situations of high controller load the count of poll commands could be incremented without actually successfully launching a command. This totally removes the accounting for status poll commnads; it was its own worst enemy. - Add some simple reentry prevention locks to processing of the waiting and completed command queues to prevent races which could result in I/O being done or completed twice (both are fatal). This highlights a need for simple locking primitives in both the UP and SMP kernels. - Streamline the handling of command completion to reduce the amount of redundant work being done. Remove the code which tests for commands that have gone missing in action; nobody has ever seen one of these and it wouldn't have worked properly anyhow. - Handle disconnection of drives from the controller in the detach, not shutdown method. This avoids problems flushing the cache in a panic when a drive is mounted. - Don't call bus_generic_detach when disconnecting drives; it doesn't actually do anything useful. - Increment the log message index regardless of whether we actually retrieved one or not. If we run into a message that we can't fetch, we don't want to spin endlessly complaining about the fact. - Don't assume that interrupts will work when we're flushing the controller. We may think they are enabled, but in eg. a panic situation the controller may not be able to deliver an interrupt.
228 lines
8.1 KiB
C
228 lines
8.1 KiB
C
/*-
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* Copyright (c) 1999 Michael Smith
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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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/*
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* We could actually use all 33 segments, but using only 32 means that
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* each scatter/gather map is 256 bytes in size, and thus we don't have to worry about
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* maps crossing page boundaries.
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*/
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#define MLX_NSEG 32 /* max scatter/gather segments we use */
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#define MLX_NSLOTS 256 /* max number of command slots */
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#define MLX_MAXDRIVES 32
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/*
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* Structure describing a System Drive as attached to the controller.
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*/
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struct mlx_sysdrive
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{
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/* from MLX_CMD_ENQSYSDRIVE */
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u_int32_t ms_size;
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int ms_state;
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int ms_raidlevel;
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/* synthetic geometry */
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int ms_cylinders;
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int ms_heads;
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int ms_sectors;
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/* handle for attached driver */
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device_t ms_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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struct mlx_command
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{
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TAILQ_ENTRY(mlx_command) mc_link; /* list linkage */
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struct mlx_softc *mc_sc; /* controller that owns us */
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u_int8_t mc_slot; /* command slot we occupy */
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u_int16_t mc_status; /* command completion status */
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time_t mc_timeout; /* when this command expires */
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u_int8_t mc_mailbox[16]; /* command mailbox */
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u_int32_t mc_sgphys; /* physical address of s/g array in controller space */
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int mc_nsgent; /* number of entries in s/g map */
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int mc_flags;
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#define MLX_CMD_DATAIN (1<<0)
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#define MLX_CMD_DATAOUT (1<<1)
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#define MLX_CMD_PRIORITY (1<<2) /* high-priority command */
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void *mc_data; /* data buffer */
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size_t mc_length;
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bus_dmamap_t mc_dmamap; /* DMA map for data */
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u_int32_t mc_dataphys; /* data buffer base address controller space */
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void (* mc_complete)(struct mlx_command *mc); /* completion handler */
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void *mc_private; /* submitter-private data or wait channel */
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};
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/*
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* Per-controller structure.
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*/
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struct mlx_softc
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{
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/* bus connections */
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device_t mlx_dev;
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struct resource *mlx_mem; /* mailbox interface window */
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bus_space_handle_t mlx_bhandle; /* bus space handle */
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bus_space_tag_t mlx_btag; /* bus space tag */
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bus_dma_tag_t mlx_parent_dmat;/* parent DMA tag */
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bus_dma_tag_t mlx_buffer_dmat;/* data buffer DMA tag */
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struct resource *mlx_irq; /* interrupt */
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void *mlx_intr; /* interrupt handle */
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/* scatter/gather lists and their controller-visible mappings */
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struct mlx_sgentry *mlx_sgtable; /* s/g lists */
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u_int32_t mlx_sgbusaddr; /* s/g table base address in bus space */
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bus_dma_tag_t mlx_sg_dmat; /* s/g buffer DMA tag */
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bus_dmamap_t mlx_sg_dmamap; /* map for s/g buffers */
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/* controller limits and features */
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int mlx_hwid; /* hardware identifier */
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int mlx_maxiop; /* maximum number of I/O operations */
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int mlx_nchan; /* number of active channels */
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int mlx_maxiosize; /* largest I/O for this controller */
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int mlx_maxtarg; /* maximum number of targets per channel */
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int mlx_maxtags; /* maximum number of tags per device */
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int mlx_scsicap; /* SCSI capabilities */
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int mlx_feature; /* controller features/quirks */
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#define MLX_FEAT_PAUSEWORKS (1<<0) /* channel pause works as expected */
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/* controller queues and arrays */
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TAILQ_HEAD(, mlx_command) mlx_freecmds; /* command structures available for reuse */
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TAILQ_HEAD(, mlx_command) mlx_work; /* active commands */
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struct mlx_command *mlx_busycmd[MLX_NSLOTS]; /* busy commands */
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int mlx_busycmds; /* count of busy commands */
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struct mlx_sysdrive mlx_sysdrive[MLX_MAXDRIVES]; /* system drives */
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struct buf_queue_head mlx_bufq; /* outstanding I/O operations */
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int mlx_waitbufs; /* number of bufs awaiting commands */
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/* controller status */
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u_int8_t mlx_fwminor; /* firmware revision */
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u_int8_t mlx_fwmajor;
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int mlx_geom;
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#define MLX_GEOM_128_32 0 /* geoemetry translation modes */
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#define MLX_GEOM_256_63 1
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int mlx_state;
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#define MLX_STATE_INTEN (1<<0) /* interrupts have been enabled */
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#define MLX_STATE_SHUTDOWN (1<<1) /* controller is shut down */
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#define MLX_STATE_OPEN (1<<2) /* control device is open */
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#define MLX_STATE_SUSPEND (1<<3) /* controller is suspended */
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struct callout_handle mlx_timeout; /* periodic status monitor */
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time_t mlx_lastpoll; /* last time_second we polled for status */
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u_int16_t mlx_lastevent; /* sequence number of the last event we recorded */
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u_int16_t mlx_currevent; /* sequence number last time we looked */
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int mlx_polling; /* if > 0, polling operations still running */
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int mlx_rebuild; /* if >= 0, drive is being rebuilt */
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u_int32_t mlx_rebuildstat;/* blocks left to rebuild if active */
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int mlx_check; /* if >= 0, drive is being checked */
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struct mlx_pause mlx_pause; /* pending pause operation details */
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int mlx_locks; /* reentrancy avoidance */
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/* interface-specific accessor functions */
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int mlx_iftype; /* interface protocol */
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#define MLX_IFTYPE_3 3
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#define MLX_IFTYPE_4 4
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#define MLX_IFTYPE_5 5
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int (* mlx_tryqueue)(struct mlx_softc *sc, struct mlx_command *mc);
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int (* mlx_findcomplete)(struct mlx_softc *sc, u_int8_t *slot, u_int16_t *status);
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void (* mlx_intaction)(struct mlx_softc *sc, int action);
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#define MLX_INTACTION_DISABLE 0
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#define MLX_INTACTION_ENABLE 1
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};
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/*
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* Simple (stupid) locks.
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*
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* Note that these are designed to avoid reentrancy, not concurrency, and will
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* need to be replaced with something better.
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*/
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#define MLX_LOCK_COMPLETING (1<<0)
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#define MLX_LOCK_STARTING (1<<1)
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static __inline int
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mlx_lock_tas(struct mlx_softc *sc, int lock)
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{
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if ((sc)->mlx_locks & (lock))
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return(1);
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atomic_set_int(&sc->mlx_locks, lock);
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return(0);
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}
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static __inline void
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mlx_lock_clr(struct mlx_softc *sc, int lock)
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{
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atomic_clear_int(&sc->mlx_locks, lock);
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}
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/*
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* Interface between bus connections and driver core.
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*/
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extern void mlx_free(struct mlx_softc *sc);
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extern int mlx_attach(struct mlx_softc *sc);
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extern void mlx_startup(struct mlx_softc *sc);
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extern void mlx_intr(void *data);
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extern int mlx_detach(device_t dev);
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extern int mlx_shutdown(device_t dev);
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extern int mlx_suspend(device_t dev);
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extern int mlx_resume(device_t dev);
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extern d_open_t mlx_open;
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extern d_close_t mlx_close;
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extern d_ioctl_t mlx_ioctl;
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extern devclass_t mlx_devclass;
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/*
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* Mylex System Disk driver
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*/
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struct mlxd_softc
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{
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device_t mlxd_dev;
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struct mlx_softc *mlxd_controller;
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struct mlx_sysdrive *mlxd_drive;
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struct disk mlxd_disk;
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struct devstat mlxd_stats;
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struct disklabel mlxd_label;
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int mlxd_unit;
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int mlxd_flags;
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#define MLXD_OPEN (1<<0) /* drive is open (can't shut down) */
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};
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/*
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* Interface between driver core and disk driver (should be using a bus?)
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*/
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extern int mlx_submit_buf(struct mlx_softc *sc, struct buf *bp);
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extern int mlx_submit_ioctl(struct mlx_softc *sc, struct mlx_sysdrive *drive, u_long cmd,
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caddr_t addr, int32_t flag, struct proc *p);
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extern void mlxd_intr(void *data);
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