/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2001 Michael Smith
 * 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.
 */

/*
 * CISS adapter driver datastructures
 */

typedef STAILQ_HEAD(, ciss_request)	cr_qhead_t;

/************************************************************************
 * Tunable parameters
 */

/*
 * There is no guaranteed upper bound on the number of concurrent
 * commands an adapter may claim to support.  Cap it at a reasonable
 * value.
 */
#define CISS_MAX_REQUESTS	1024

/*
 * Maximum number of logical drives we support.
 * If the controller does not indicate a maximum
 * value.  This is a compatibiliy value to support
 * older ciss controllers (e.g. model 6i)
 */
#define CISS_MAX_LOGICAL	16

/*
 * Maximum number of physical devices we support.
 */
#define CISS_MAX_PHYSICAL	1024

/*
 * Interrupt reduction can be controlled by tuning the interrupt
 * coalesce delay and count parameters.  The delay (in microseconds)
 * defers delivery of interrupts to increase the chance of there being
 * more than one completed command ready when the interrupt is
 * delivered.  The count expedites the delivery of the interrupt when
 * the given number of commands are ready.
 *
 * If the delay is set to 0, interrupts are delivered immediately.
 */
#define CISS_INTERRUPT_COALESCE_DELAY	0
#define CISS_INTERRUPT_COALESCE_COUNT	16

/*
 * Heartbeat routine timeout in seconds.  Note that since event
 * handling is performed on a callback basis, we don't need this to
 * run very often.
 */
#define CISS_HEARTBEAT_RATE		10

/************************************************************************
 * Driver version.  Only really significant to the ACU interface.
 */
#define CISS_DRIVER_VERSION	20011201

/************************************************************************
 * Driver data structures
 */

/*
 * Each command issued to the adapter is managed by a request
 * structure.
 */
struct ciss_request
{
    STAILQ_ENTRY(ciss_request)	cr_link;
    int				cr_onq;		/* which queue we are on */

    struct ciss_softc		*cr_sc;		/* controller softc */
    void			*cr_data;	/* data buffer */
    u_int32_t			cr_length;	/* data length */
    bus_dmamap_t		cr_datamap;	/* DMA map for data */
    struct ciss_command		*cr_cc;
    uint32_t			cr_ccphys;
    int				cr_tag;
    int				cr_flags;
#define CISS_REQ_MAPPED		(1<<0)		/* data mapped */
#define CISS_REQ_SLEEP		(1<<1)		/* submitter sleeping */
#define CISS_REQ_POLL		(1<<2)		/* submitter polling */
#define CISS_REQ_DATAOUT	(1<<3)		/* data host->adapter */
#define CISS_REQ_DATAIN		(1<<4)		/* data adapter->host */
#define CISS_REQ_BUSY		(1<<5)		/* controller has req */
#define CISS_REQ_CCB		(1<<6)		/* data is ccb */

    void			(* cr_complete)(struct ciss_request *);
    void			*cr_private;
    int				cr_sg_tag;
#define CISS_SG_MAX		((CISS_SG_FETCH_MAX << 1) | 0x1)
#define CISS_SG_1		((CISS_SG_FETCH_1 << 1) | 0x01)
#define CISS_SG_2		((CISS_SG_FETCH_2 << 1) | 0x01)
#define CISS_SG_4		((CISS_SG_FETCH_4 << 1) | 0x01)
#define CISS_SG_8		((CISS_SG_FETCH_8 << 1) | 0x01)
#define CISS_SG_16		((CISS_SG_FETCH_16 << 1) | 0x01)
#define CISS_SG_32		((CISS_SG_FETCH_32 << 1) | 0x01)
#define CISS_SG_NONE		((CISS_SG_FETCH_NONE << 1) | 0x01)
};

/*
 * The adapter command structure is defined with a zero-length
 * scatter/gather list size.  In practise, we want space for a
 * scatter-gather list, and we also want to avoid having commands
 * cross page boundaries.
 *
 * The size of the ciss_command is 52 bytes.  65 s/g elements are reserved
 * to allow a max i/o size of 256k.  This gives a total command size of
 * 1120 bytes, including the 32 byte alignment padding.  Modern controllers
 * seem to saturate nicely at this value.
 */

#define CISS_MAX_SG_ELEMENTS	65
#define CISS_COMMAND_ALIGN	32
#define CISS_COMMAND_SG_LENGTH	(sizeof(struct ciss_sg_entry) * CISS_MAX_SG_ELEMENTS)
#define CISS_COMMAND_ALLOC_SIZE		(roundup2(sizeof(struct ciss_command) + CISS_COMMAND_SG_LENGTH, CISS_COMMAND_ALIGN))

/*
 * Per-logical-drive data.
 */
struct ciss_ldrive
{
    union ciss_device_address	cl_address;
    union ciss_device_address	*cl_controller;
    int				cl_status;
#define CISS_LD_NONEXISTENT	0
#define CISS_LD_ONLINE		1
#define CISS_LD_OFFLINE		2

    int				cl_update;

    struct ciss_bmic_id_ldrive	*cl_ldrive;
    struct ciss_bmic_id_lstatus	*cl_lstatus;
    struct ciss_ldrive_geometry	cl_geometry;

    char			cl_name[16];		/* device name */
};

/*
 * Per-physical-drive data
 */
struct ciss_pdrive
{
    union ciss_device_address	cp_address;
    int				cp_online;
};

#define CISS_PHYSICAL_SHIFT	5
#define CISS_PHYSICAL_BASE	(1 << CISS_PHYSICAL_SHIFT)
#define CISS_MAX_PHYSTGT	256

#define CISS_IS_PHYSICAL(bus)	(bus >= CISS_PHYSICAL_BASE)
#define CISS_CAM_TO_PBUS(bus)	(bus - CISS_PHYSICAL_BASE)

/*
 * Per-adapter data
 */
struct ciss_softc
{
    /* bus connections */
    device_t			ciss_dev;		/* bus attachment */
    struct cdev *ciss_dev_t;		/* control device */

    struct resource		*ciss_regs_resource;	/* register interface window */
    int				ciss_regs_rid;		/* resource ID */
    bus_space_handle_t		ciss_regs_bhandle;	/* bus space handle */
    bus_space_tag_t		ciss_regs_btag;		/* bus space tag */

    struct resource		*ciss_cfg_resource;	/* config struct interface window */
    int				ciss_cfg_rid;		/* resource ID */
    struct ciss_config_table	*ciss_cfg;		/* config table in adapter memory */
    struct ciss_perf_config	*ciss_perf;		/* config table for the performant */
    struct ciss_bmic_id_table	*ciss_id;		/* ID table in host memory */
    u_int32_t			ciss_heartbeat;		/* last heartbeat value */
    int				ciss_heart_attack;	/* number of times we have seen this value */

    int				ciss_msi;
    struct resource		*ciss_irq_resource;	/* interrupt */
    int				ciss_irq_rid[CISS_MSI_COUNT];		/* resource ID */
    void			*ciss_intr;		/* interrupt handle */

    bus_dma_tag_t		ciss_parent_dmat;	/* parent DMA tag */
    bus_dma_tag_t		ciss_buffer_dmat;	/* data buffer/command DMA tag */

    u_int32_t			ciss_interrupt_mask;	/* controller interrupt mask bits */

    uint64_t			*ciss_reply;
    int				ciss_cycle;
    int				ciss_rqidx;
    bus_dma_tag_t		ciss_reply_dmat;
    bus_dmamap_t		ciss_reply_map;
    uint32_t			ciss_reply_phys;

    int				ciss_max_requests;
    struct ciss_request		ciss_request[CISS_MAX_REQUESTS];	/* requests */
    void			*ciss_command;		/* command structures */
    bus_dma_tag_t		ciss_command_dmat;	/* command DMA tag */
    bus_dmamap_t		ciss_command_map;	/* command DMA map */
    u_int32_t			ciss_command_phys;	/* command array base address */
    cr_qhead_t			ciss_free;		/* requests available for reuse */
    cr_qhead_t			ciss_notify;		/* requests which are defered for processing */
    struct proc			*ciss_notify_thread;

    struct callout		ciss_periodic;		/* periodic event handling */
    struct ciss_request		*ciss_periodic_notify;	/* notify callback request */

    struct mtx			ciss_mtx;
    struct ciss_ldrive		**ciss_logical;
    struct ciss_pdrive		**ciss_physical;
    union ciss_device_address	*ciss_controllers;	/* controller address */
    int				ciss_max_bus_number;	/* maximum bus number */
    int				ciss_max_logical_bus;
    int				ciss_max_physical_bus;

    struct cam_devq		*ciss_cam_devq;
    struct cam_sim		**ciss_cam_sim;

    int				ciss_soft_reset;

    int				ciss_flags;
#define CISS_FLAG_NOTIFY_OK	(1<<0)		/* notify command running OK */
#define CISS_FLAG_CONTROL_OPEN	(1<<1)		/* control device is open */
#define CISS_FLAG_ABORTING	(1<<2)		/* driver is going away */
#define CISS_FLAG_RUNNING	(1<<3)		/* driver is running (interrupts usable) */
#define CISS_FLAG_BUSY		(1<<4)		/* no free commands */

#define CISS_FLAG_FAKE_SYNCH	(1<<16)		/* needs SYNCHRONISE_CACHE faked */
#define CISS_FLAG_BMIC_ABORT	(1<<17)		/* use BMIC command to abort Notify on Event */
#define CISS_FLAG_THREAD_SHUT	(1<<20)		/* shutdown the kthread */

    struct ciss_qstat		ciss_qstat[CISSQ_COUNT];	/* queue statistics */
};

/************************************************************************
 * Debugging/diagnostic output.
 */

/*
 * Debugging levels:
 *  0 - quiet, only emit warnings
 *  1 - talkative, log major events, but nothing on the I/O path
 *  2 - noisy, log events on the I/O path
 *  3 - extremely noisy, log items in loops
 */
#ifdef CISS_DEBUG
# define debug(level, fmt, args...)							\
	do {										\
	    if (level <= CISS_DEBUG) printf("%s: " fmt "\n", __func__ , ##args);	\
	} while(0)
# define debug_called(level)						\
	do {								\
	    if (level <= CISS_DEBUG) printf("%s: called\n", __func__);	\
	} while(0)
# define debug_struct(s)		printf("  SIZE %s: %zu\n", #s, sizeof(struct s))
# define debug_union(s)			printf("  SIZE %s: %zu\n", #s, sizeof(union s))
# define debug_type(s)			printf("  SIZE %s: %zu\n", #s, sizeof(s))
# define debug_field(s, f)		printf("  OFFSET %s.%s: %d\n", #s, #f, ((int)&(((struct s *)0)->f)))
# define debug_const(c)			printf("  CONST %s %jd/0x%jx\n", #c, (intmax_t)c, (intmax_t)c);
#else
# define debug(level, fmt, args...)
# define debug_called(level)
# define debug_struct(s)
# define debug_union(s)
# define debug_type(s)
# define debug_field(s, f)
# define debug_const(c)
#endif

#define ciss_printf(sc, fmt, args...)	device_printf(sc->ciss_dev, fmt , ##args)

/************************************************************************
 * Queue primitives
 */

#define CISSQ_ADD(sc, qname)					\
	do {							\
	    struct ciss_qstat *qs = &(sc)->ciss_qstat[qname];	\
								\
	    qs->q_length++;					\
	    if (qs->q_length > qs->q_max)			\
		qs->q_max = qs->q_length;			\
	} while(0)

#define CISSQ_REMOVE(sc, qname)    (sc)->ciss_qstat[qname].q_length--
#define CISSQ_INIT(sc, qname)			\
	do {					\
	    sc->ciss_qstat[qname].q_length = 0;	\
	    sc->ciss_qstat[qname].q_max = 0;	\
	} while(0)

#define CISSQ_REQUEST_QUEUE(name, index)				\
static __inline void							\
ciss_initq_ ## name (struct ciss_softc *sc)				\
{									\
    STAILQ_INIT(&sc->ciss_ ## name);					\
    CISSQ_INIT(sc, index);						\
}									\
static __inline void							\
ciss_enqueue_ ## name (struct ciss_request *cr)				\
{									\
									\
    STAILQ_INSERT_TAIL(&cr->cr_sc->ciss_ ## name, cr, cr_link);		\
    CISSQ_ADD(cr->cr_sc, index);					\
    cr->cr_onq = index;							\
}									\
static __inline void							\
ciss_requeue_ ## name (struct ciss_request *cr)				\
{									\
									\
    STAILQ_INSERT_HEAD(&cr->cr_sc->ciss_ ## name, cr, cr_link);		\
    CISSQ_ADD(cr->cr_sc, index);					\
    cr->cr_onq = index;							\
}									\
static __inline struct ciss_request *					\
ciss_dequeue_ ## name (struct ciss_softc *sc)				\
{									\
    struct ciss_request	*cr;						\
									\
    if ((cr = STAILQ_FIRST(&sc->ciss_ ## name)) != NULL) {		\
	STAILQ_REMOVE_HEAD(&sc->ciss_ ## name, cr_link);		\
	CISSQ_REMOVE(sc, index);					\
	cr->cr_onq = -1;						\
    }									\
    return(cr);								\
}									\
struct hack

CISSQ_REQUEST_QUEUE(free, CISSQ_FREE);
CISSQ_REQUEST_QUEUE(notify, CISSQ_NOTIFY);

static __inline void
ciss_enqueue_complete(struct ciss_request *ac, cr_qhead_t *head)
{

    STAILQ_INSERT_TAIL(head, ac, cr_link);
}

static __inline struct ciss_request *
ciss_dequeue_complete(struct ciss_softc *sc, cr_qhead_t *head)
{
    struct ciss_request  *ac;

    if ((ac = STAILQ_FIRST(head)) != NULL)
        STAILQ_REMOVE_HEAD(head, cr_link);
    return(ac);
}

/********************************************************************************
 * space-fill a character string
 */
static __inline void
padstr(char *targ, const char *src, int len)
{
    while (len-- > 0) {
	if (*src != 0) {
	    *targ++ = *src++;
	} else {
	    *targ++ = ' ';
	}
    }
}

#define ciss_report_request(a, b, c)	\
	_ciss_report_request(a, b, c, __FUNCTION__)
