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freebsd-skq/sys/dev/twe/twevar.h
vkashyap 570fb9bce1 Fix for a problem seen only on 6xxx series controllers, where-in the 
driver tries to submit the same request repeatedly, on finding the
controller cmd queue to be full.

Submitted by:ps, vkashyap
Reviewed by:re
Approved by:re
2004-06-11 18:42:44 +00:00

293 lines
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/*-
* Copyright (c) 2000 Michael Smith
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#define TWE_DRIVER_VERSION_STRING "1.50.01.002"
#ifdef TWE_DEBUG
#define debug(level, fmt, args...) \
do { \
if (level <= TWE_DEBUG) printf("%s: " fmt "\n", __func__ , ##args); \
} while(0)
#define debug_called(level) \
do { \
if (level <= TWE_DEBUG) printf("%s: called\n", __func__); \
} while(0)
#else
#define debug(level, fmt, args...)
#define debug_called(level)
#endif
/*
* Structure describing a logical unit as attached to the controller
*/
struct twe_drive
{
/* unit properties */
u_int32_t td_size;
int td_cylinders;
int td_heads;
int td_sectors;
int td_sys_unit; /* device unit number */
int td_twe_unit; /* index into sc->twe_drive[] */
/* unit state and type */
u_int8_t td_state;
u_int8_t td_type;
/* handle for attached driver */
device_t td_disk;
};
/*
* Per-command control structure.
*
* Note that due to alignment constraints on the tc_command field, this *must* be 64-byte aligned.
* We achieve this by placing the command at the beginning of the structure, and using malloc()
* to allocate each structure.
*/
struct twe_request
{
int tr_tag;
/* command payload */
void *tr_data; /* data buffer */
void *tr_realdata; /* copy of real data buffer pointer for alignment fixup */
size_t tr_length;
TAILQ_ENTRY(twe_request) tr_link; /* list linkage */
struct twe_softc *tr_sc; /* controller that owns us */
int tr_status; /* command status */
#define TWE_CMD_SETUP 0 /* being assembled */
#define TWE_CMD_BUSY 1 /* submitted to controller */
#define TWE_CMD_COMPLETE 2 /* completed by controller (maybe with error) */
#define TWE_CMD_ERROR 3 /* encountered error, even before submission to controller */
int tr_flags;
#define TWE_CMD_DATAIN (1<<0)
#define TWE_CMD_DATAOUT (1<<1)
#define TWE_CMD_ALIGNBUF (1<<2) /* data in bio is misaligned, have to copy to/from private buffer */
#define TWE_CMD_SLEEPER (1<<3) /* owner is sleeping on this command */
#define TWE_CMD_IMMEDIATE (1<<4) /* immediate request */
#define TWE_CMD_MAPPED (1<<5)
#define TWE_CMD_IN_PROGRESS (1<<6) /* bus_dmamap_load returned EINPROGRESS */
void (* tr_complete)(struct twe_request *tr); /* completion handler */
void *tr_private; /* submitter-private data or wait channel */
TWE_PLATFORM_REQUEST /* platform-specific request elements */
};
#define TWE_FIND_COMMAND(tr) \
(TWE_Command *)((u_int8_t *)(tr)->tr_sc->twe_cmd + \
((tr)->tr_tag * sizeof(TWE_Command)))
#define TWE_FIND_COMMANDPHYS(tr) ((tr)->tr_sc->twe_cmdphys + \
((tr)->tr_tag * sizeof(TWE_Command)))
/*
* Per-controller state.
*/
struct twe_softc
{
/* controller queues and arrays */
TAILQ_HEAD(, twe_request) twe_free; /* command structures available for reuse */
twe_bioq twe_bioq; /* outstanding I/O operations */
TAILQ_HEAD(, twe_request) twe_ready; /* requests ready for the controller */
TAILQ_HEAD(, twe_request) twe_busy; /* requests busy in the controller */
TAILQ_HEAD(, twe_request) twe_complete; /* active commands (busy or waiting for completion) */
struct twe_request *twe_lookup[TWE_Q_LENGTH]; /* commands indexed by request ID */
struct twe_drive twe_drive[TWE_MAX_UNITS]; /* attached drives */
/* asynchronous event handling */
u_int16_t twe_aen_queue[TWE_Q_LENGTH]; /* AENs queued for userland tool(s) */
int twe_aen_head, twe_aen_tail; /* ringbuffer pointers for AEN queue */
int twe_wait_aen; /* wait-for-aen notification */
/* controller status */
int twe_state;
#define TWE_STATE_INTEN (1<<0) /* interrupts have been enabled */
#define TWE_STATE_SHUTDOWN (1<<1) /* controller is shut down */
#define TWE_STATE_OPEN (1<<2) /* control device is open */
#define TWE_STATE_SUSPEND (1<<3) /* controller is suspended */
#define TWE_STATE_FRZN (1<<4) /* got EINPROGRESS */
#define TWE_STATE_CTLR_BUSY (1<<5) /* controller cmd queue full */
int twe_host_id;
struct twe_qstat twe_qstat[TWEQ_COUNT]; /* queue statistics */
TWE_PLATFORM_SOFTC /* platform-specific softc elements */
};
/*
* Interface betwen driver core and platform-dependant code.
*/
extern int twe_setup(struct twe_softc *sc); /* do early driver/controller setup */
extern void twe_init(struct twe_softc *sc); /* init controller */
extern void twe_deinit(struct twe_softc *sc); /* stop controller */
extern void twe_intr(struct twe_softc *sc); /* hardware interrupt signalled */
extern void twe_startio(struct twe_softc *sc);
extern int twe_start(struct twe_request *tr);
extern int twe_dump_blocks(struct twe_softc *sc, int unit, /* crashdump block write */
u_int32_t lba, void *data, int nblks);
extern int twe_ioctl(struct twe_softc *sc, int cmd,
void *addr); /* handle user request */
extern void twe_describe_controller(struct twe_softc *sc); /* print controller info */
extern void twe_print_controller(struct twe_softc *sc);
extern void twe_enable_interrupts(struct twe_softc *sc); /* enable controller interrupts */
extern void twe_disable_interrupts(struct twe_softc *sc); /* disable controller interrupts */
extern int twe_attach_drive(struct twe_softc *sc,
struct twe_drive *dr); /* attach drive when found in twe_init */
extern int twe_detach_drive(struct twe_softc *sc,
int unit); /* detach drive */
extern void twe_clear_pci_parity_error(struct twe_softc *sc);
extern void twe_clear_pci_abort(struct twe_softc *sc);
extern void twed_intr(twe_bio *bp); /* return bio from core */
extern struct twe_request *twe_allocate_request(struct twe_softc *sc, int tag); /* allocate request structure */
extern void twe_free_request(struct twe_request *tr); /* free request structure */
extern int twe_map_request(struct twe_request *tr); /* make request visible to controller, do s/g */
extern void twe_unmap_request(struct twe_request *tr); /* cleanup after transfer, unmap */
/********************************************************************************
* Queue primitives
*/
#define TWEQ_ADD(sc, qname) \
do { \
struct twe_qstat *qs = &(sc)->twe_qstat[qname]; \
\
qs->q_length++; \
if (qs->q_length > qs->q_max) \
qs->q_max = qs->q_length; \
} while(0)
#define TWEQ_REMOVE(sc, qname) \
do { \
struct twe_qstat *qs = &(sc)->twe_qstat[qname]; \
\
qs->q_length--; \
if (qs->q_length < qs->q_min) \
qs->q_min = qs->q_length; \
} while(0);
#define TWEQ_INIT(sc, qname) \
do { \
sc->twe_qstat[qname].q_length = 0; \
sc->twe_qstat[qname].q_max = 0; \
sc->twe_qstat[qname].q_min = 0xFFFFFFFF; \
} while(0)
#define TWEQ_REQUEST_QUEUE(name, index) \
static __inline void \
twe_initq_ ## name (struct twe_softc *sc) \
{ \
TAILQ_INIT(&sc->twe_ ## name); \
TWEQ_INIT(sc, index); \
} \
static __inline void \
twe_enqueue_ ## name (struct twe_request *tr) \
{ \
int s; \
\
s = splbio(); \
TAILQ_INSERT_TAIL(&tr->tr_sc->twe_ ## name, tr, tr_link); \
TWEQ_ADD(tr->tr_sc, index); \
splx(s); \
} \
static __inline void \
twe_requeue_ ## name (struct twe_request *tr) \
{ \
int s; \
\
s = splbio(); \
TAILQ_INSERT_HEAD(&tr->tr_sc->twe_ ## name, tr, tr_link); \
TWEQ_ADD(tr->tr_sc, index); \
splx(s); \
} \
static __inline struct twe_request * \
twe_dequeue_ ## name (struct twe_softc *sc) \
{ \
struct twe_request *tr; \
int s; \
\
s = splbio(); \
if ((tr = TAILQ_FIRST(&sc->twe_ ## name)) != NULL) { \
TAILQ_REMOVE(&sc->twe_ ## name, tr, tr_link); \
TWEQ_REMOVE(sc, index); \
} \
splx(s); \
return(tr); \
} \
static __inline void \
twe_remove_ ## name (struct twe_request *tr) \
{ \
int s; \
\
s = splbio(); \
TAILQ_REMOVE(&tr->tr_sc->twe_ ## name, tr, tr_link); \
TWEQ_REMOVE(tr->tr_sc, index); \
splx(s); \
}
TWEQ_REQUEST_QUEUE(free, TWEQ_FREE)
TWEQ_REQUEST_QUEUE(ready, TWEQ_READY)
TWEQ_REQUEST_QUEUE(busy, TWEQ_BUSY)
TWEQ_REQUEST_QUEUE(complete, TWEQ_COMPLETE)
/*
* outstanding bio queue
*/
static __inline void
twe_initq_bio(struct twe_softc *sc)
{
TWE_BIO_QINIT(sc->twe_bioq);
TWEQ_INIT(sc, TWEQ_BIO);
}
static __inline void
twe_enqueue_bio(struct twe_softc *sc, twe_bio *bp)
{
int s;
s = splbio();
TWE_BIO_QINSERT(sc->twe_bioq, bp);
TWEQ_ADD(sc, TWEQ_BIO);
splx(s);
}
static __inline twe_bio *
twe_dequeue_bio(struct twe_softc *sc)
{
int s;
twe_bio *bp;
s = splbio();
if ((bp = TWE_BIO_QFIRST(sc->twe_bioq)) != NULL) {
TWE_BIO_QREMOVE(sc->twe_bioq, bp);
TWEQ_REMOVE(sc, TWEQ_BIO);
}
splx(s);
return(bp);
}
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