path: root/sys/dev/pci/mfii.c

/* $OpenBSD: mfii.c,v 1.1 2012/08/14 00:27:51 dlg Exp $ */

/*
 * Copyright (c) 2012 David Gwynne <dlg@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "bio.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/types.h>
#include <sys/pool.h>

#include <dev/pci/pcidevs.h>
#include <dev/pci/pcivar.h>

#include <machine/bus.h>

#include <scsi/scsi_all.h>
#include <scsi/scsi_disk.h>
#include <scsi/scsiconf.h>

#include <dev/ic/mfireg.h>
#include <dev/pci/mpiireg.h>

#define	MFII_BAR		0x14
#define	MFII_PCI_MEMSIZE	0x2000 /* 8k */

#define MFII_OSTS_INTR_VALID	0x00000009
#define MFII_RPI		0x6c /* reply post host index */

#define MFII_REQ_TYPE_SCSI	MPII_REQ_DESCR_SCSI_IO
#define MFII_REQ_TYPE_LDIO	(0x7 << 1)
#define MFII_REQ_TYPE_MFA	(0x1 << 1)
#define MFII_REQ_TYPE_NO_LOCK	(0x2 << 1)

#define MFII_REQ_MFA(_a)	htole64((_a) | MFII_REQ_TYPE_MFA)

#define MFII_FUNCTION_LDIO_REQUEST			(0xf1)

struct mfii_request_descr {
	u_int8_t	flags;
	u_int8_t	msix_index;
	u_int16_t	smid;

	u_int16_t	lmid;
	u_int16_t	field;
} __packed;

struct mfii_raid_context {
	u_int8_t	type_nseg;
	u_int8_t	_reserved1;
	u_int16_t	timeout_value;

	u_int8_t	reg_lock_flags;
	u_int8_t	_reserved2;
	u_int16_t	virtual_disk_target_id;

	u_int64_t	reg_lock_row_lba;

	u_int32_t	reg_lock_length;

	u_int16_t	next_lm_id;
	u_int8_t	ex_status;
	u_int8_t	status;

	u_int8_t	raid_flags;
	u_int8_t	num_sge;
	u_int16_t	config_seq_num;

	u_int8_t	span_arm;
	u_int8_t	_reserved3[3];
} __packed;

struct mfii_sge {
	u_int64_t	sg_addr;
	u_int32_t	sg_len;
	u_int16_t	_reserved;
	u_int8_t	sg_next_chain_offset;
	u_int8_t	sg_flags;
} __packed;

#define MFII_SGE_ADDR_MASK		(0x03)
#define MFII_SGE_ADDR_SYSTEM		(0x00)
#define MFII_SGE_ADDR_IOCDDR		(0x01)
#define MFII_SGE_ADDR_IOCPLB		(0x02)
#define MFII_SGE_ADDR_IOCPLBNTA		(0x03)
#define MFII_SGE_END_OF_LIST		(0x40)
#define MFII_SGE_CHAIN_ELEMENT		(0x80)

#define MFII_REQUEST_SIZE	256

struct mfii_dmamem {
	bus_dmamap_t		mdm_map;
	bus_dma_segment_t	mdm_seg;
	size_t			mdm_size;
	caddr_t			mdm_kva;
};
#define MFII_DMA_MAP(_mdm)	((_mdm)->mdm_map)
#define MFII_DMA_LEN(_mdm)	((_mdm)->mdm_size)
#define MFII_DMA_DVA(_mdm)	((u_int64_t)(_mdm)->mdm_map->dm_segs[0].ds_addr)
#define MFII_DMA_KVA(_mdm)	((void *)(_mdm)->mdm_kva)

struct mfii_softc;

struct mfii_ccb {
	void			*ccb_request;
	u_int64_t		ccb_request_dva;
	bus_addr_t		ccb_request_offset;

	struct mfi_sense	*ccb_sense;
	u_int32_t		ccb_sense_dva;
	bus_addr_t		ccb_sense_offset;

	struct mfii_request_descr ccb_req;

	bus_dmamap_t		ccb_dmamap;

	union mfi_sgl		*ccb_sgl;

	/* data for sgl */  
	void			*ccb_data;
	size_t			ccb_len;

	int			ccb_direction;
#define MFII_DATA_NONE			0
#define MFII_DATA_IN			1
#define MFII_DATA_OUT			2

	void			*ccb_cookie;
	void			(*ccb_done)(struct mfii_softc *,
				    struct mfii_ccb *);

	u_int32_t		ccb_flags;
#define MFI_CCB_F_ERR			(1<<0)
	u_int			ccb_smid;
	SLIST_ENTRY(mfii_ccb)	ccb_link;
};
SLIST_HEAD(mfii_ccb_list, mfii_ccb);

struct mfii_softc {
	struct device		sc_dev;

	pci_chipset_tag_t	sc_pc;
	pcitag_t		sc_tag;

	bus_space_tag_t		sc_iot;
	bus_space_handle_t	sc_ioh;
	bus_size_t		sc_ios;
	bus_dma_tag_t		sc_dmat;

	void			*sc_ih;

	struct mutex		sc_ccb_mtx;
	struct mutex		sc_post_mtx;

	u_int			sc_max_cmds;
	u_int			sc_max_sgl;

	u_int			sc_reply_postq_depth;
	u_int			sc_reply_postq_index;
	struct mutex		sc_reply_postq_mtx;
	struct mfii_dmamem	*sc_reply_postq;

	struct mfii_dmamem	*sc_requests;
	struct mfii_dmamem	*sc_sense;

	struct mfii_ccb		*sc_ccb;
	struct mfii_ccb_list	sc_ccb_freeq;

	struct scsi_link	sc_link;
	struct scsibus_softc	*sc_scsibus;
	struct scsi_iopool	sc_iopool;

	struct mfi_ctrl_info	sc_info;
};

int		mfii_match(struct device *, void *, void *);
void		mfii_attach(struct device *, struct device *, void *);
int		mfii_detach(struct device *, int);

struct cfattach mfii_ca = {
	sizeof(struct mfii_softc),
	mfii_match,
	mfii_attach,
	mfii_detach
};

struct cfdriver mfii_cd = {
	NULL,
	"mfii",
	DV_DULL
};

void		mfii_scsi_cmd(struct scsi_xfer *);
void		mfii_scsi_cmd_done(struct mfii_softc *, struct mfii_ccb *);

struct scsi_adapter mfii_switch = {
	mfii_scsi_cmd,
	scsi_minphys,
	NULL, /* probe */
	NULL, /* unprobe */
	NULL  /* ioctl */
};

#define DEVNAME(_sc)		((_sc)->sc_dev.dv_xname)

u_int32_t		mfii_read(struct mfii_softc *, bus_size_t);
void			mfii_write(struct mfii_softc *, bus_size_t, u_int32_t);

struct mfii_dmamem *	mfii_dmamem_alloc(struct mfii_softc *, size_t);
void			mfii_dmamem_free(struct mfii_softc *,
			    struct mfii_dmamem *);

void *			mfii_get_ccb(void *);
void			mfii_put_ccb(void *, void *);
int			mfii_init_ccb(struct mfii_softc *);
void			mfii_scrub_ccb(struct mfii_ccb *);

int			mfii_transition_firmware(struct mfii_softc *);
int			mfii_initialise_firmware(struct mfii_softc *);
int			mfii_get_info(struct mfii_softc *);

void			mfii_start(struct mfii_softc *, struct mfii_ccb *);
void			mfii_done(struct mfii_softc *, struct mfii_ccb *);
int			mfii_poll(struct mfii_softc *, struct mfii_ccb *);
void			mfii_poll_done(struct mfii_softc *, struct mfii_ccb *);
int			mfii_my_intr(struct mfii_softc *);
int			mfii_intr(void *);
void			mfii_postq(struct mfii_softc *);
void			mfii_empty_done(struct mfii_softc *,
			    struct mfii_ccb *);

int			mfii_load_ccb(struct mfii_softc *, struct mfii_ccb *,
			    void *, int);

int			mfii_mfa_poll(struct mfii_softc *, struct mfii_ccb *);

int			mfii_mgmt(struct mfii_softc *, u_int32_t, u_int32_t,
			    u_int32_t, void *, u_int8_t *);
int			mfii_do_mgmt(struct mfii_softc *, struct mfii_ccb *,
			    u_int32_t, u_int32_t, u_int32_t, void *,
			    u_int8_t *);
void			mfii_mgmt_done(struct mfii_softc *, struct mfii_ccb *);

int			mfii_scsi_cmd_io(struct mfii_softc *,
			    struct scsi_xfer *);
int			mfii_scsi_cmd_cdb(struct mfii_softc *,
			    struct scsi_xfer *);
int			mfii_create_sgl(struct mfii_softc *, struct mfii_ccb *,
			    int);


#define mfii_fw_state(_sc) mfii_read((_sc), MFI_OSP)

static const struct pci_matchid mfii_devices[] = {
	{ PCI_VENDOR_SYMBIOS,	PCI_PRODUCT_SYMBIOS_MEGARAID_2208 }
};

int
mfii_match(struct device *parent, void *match, void *aux)
{
	return (pci_matchbyid(aux, mfii_devices, nitems(mfii_devices)));
}

void
mfii_attach(struct device *parent, struct device *self, void *aux)
{
	struct mfii_softc *sc = (struct mfii_softc *)self;
	struct pci_attach_args *pa = aux;
	pcireg_t memtype;
	pci_intr_handle_t ih;
	struct scsibus_attach_args saa;
	u_int32_t status;

	/* init sc */
	sc->sc_dmat = pa->pa_dmat;
	SLIST_INIT(&sc->sc_ccb_freeq);
	mtx_init(&sc->sc_ccb_mtx, IPL_BIO);
	mtx_init(&sc->sc_post_mtx, IPL_BIO);
	mtx_init(&sc->sc_reply_postq_mtx, IPL_BIO);
	scsi_iopool_init(&sc->sc_iopool, sc, mfii_get_ccb, mfii_put_ccb);

	/* wire up the bus shizz */
	memtype = pci_mapreg_type(pa->pa_pc, pa->pa_tag, MFII_BAR);
	if (pci_mapreg_map(pa, MFII_BAR, memtype, 0,
	    &sc->sc_iot, &sc->sc_ioh, NULL, &sc->sc_ios, MFII_PCI_MEMSIZE)) {
		printf(": unable to map registers\n");
		return;
	}

	if (pci_intr_map(pa, &ih) != 0) {
		printf(": unable to map interrupt\n");
		goto pci_unmap;
	}
	printf(": %s\n", pci_intr_string(pa->pa_pc, ih));

	/* lets get started */
	if (mfii_transition_firmware(sc))
		goto pci_unmap;

	status = mfii_fw_state(sc);
	sc->sc_max_cmds = status & MFI_STATE_MAXCMD_MASK;
	sc->sc_max_sgl = (status & MFI_STATE_MAXSGL_MASK) >> 16;

	/* sense memory */
	sc->sc_sense = mfii_dmamem_alloc(sc, sc->sc_max_cmds * MFI_SENSE_SIZE);
	if (sc->sc_sense == NULL) {
		printf("%s: unable to allocate sense memory\n", DEVNAME(sc));
		goto pci_unmap;
	}

	sc->sc_reply_postq_depth = roundup(sc->sc_max_cmds, 16);

	sc->sc_reply_postq = mfii_dmamem_alloc(sc,
	    sc->sc_reply_postq_depth * sizeof(struct mpii_reply_descr));
	if (sc->sc_reply_postq == NULL)
		goto free_sense;

	memset(MFII_DMA_KVA(sc->sc_reply_postq), 0xff,
	    MFII_DMA_LEN(sc->sc_reply_postq));

	sc->sc_requests = mfii_dmamem_alloc(sc,
	    MFII_REQUEST_SIZE * (sc->sc_max_cmds + 1));
	if (sc->sc_requests == NULL)
		goto free_reply_postq;

	if (mfii_init_ccb(sc) != 0) {
		printf("%s: could not init ccb list\n", DEVNAME(sc));
		goto free_requests;
	}

	/* kickstart firmware with all addresses and pointers */
	if (mfii_initialise_firmware(sc) != 0) {
		printf("%s: could not initialize firmware\n", DEVNAME(sc));
		goto free_requests;
	}

	if (mfii_get_info(sc) != 0) {
		printf("%s: could not retrieve controller information\n",
		    DEVNAME(sc));
		goto free_requests;
	}

	printf("%s: \"%s\", firmware %s", DEVNAME(sc),
	    sc->sc_info.mci_product_name, sc->sc_info.mci_package_version);
	if (letoh16(sc->sc_info.mci_memory_size) > 0)
		printf(", %uMB cache", letoh16(sc->sc_info.mci_memory_size));
	printf("\n");

	sc->sc_ih = pci_intr_establish(sc->sc_pc, ih, IPL_BIO,
	    mfii_intr, sc, DEVNAME(sc));
	if (sc->sc_ih == NULL)
		goto free_requests;

	sc->sc_link.openings = sc->sc_max_cmds;
	sc->sc_link.adapter_softc = sc;
	sc->sc_link.adapter = &mfii_switch;
	sc->sc_link.adapter_target = sc->sc_info.mci_max_lds;
	sc->sc_link.adapter_buswidth = sc->sc_info.mci_max_lds;
	sc->sc_link.pool = &sc->sc_iopool;

	bzero(&saa, sizeof(saa));
	saa.saa_sc_link = &sc->sc_link;

	config_found(&sc->sc_dev, &saa, scsiprint);

	/* enable interrupts */
	mfii_write(sc, MFI_OSTS, 0xffffffff);
	mfii_write(sc, MFI_OMSK, ~MFII_OSTS_INTR_VALID);

	return;

free_requests:
	mfii_dmamem_free(sc, sc->sc_requests);
free_reply_postq:
	mfii_dmamem_free(sc, sc->sc_reply_postq);
free_sense:
	mfii_dmamem_free(sc, sc->sc_sense);
pci_unmap:
	bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios);
}

int
mfii_detach(struct device *self, int flags)
{
	struct mfii_softc *sc = (struct mfii_softc *)self;

	if (sc->sc_ih == NULL)
		return (0);

	pci_intr_disestablish(sc->sc_pc, sc->sc_ih); 
	mfii_dmamem_free(sc, sc->sc_requests);
	mfii_dmamem_free(sc, sc->sc_reply_postq);
	mfii_dmamem_free(sc, sc->sc_sense);
	bus_space_unmap(sc->sc_iot, sc->sc_ioh, sc->sc_ios);

	return (0);
}

u_int32_t
mfii_read(struct mfii_softc *sc, bus_size_t r)
{
	bus_space_barrier(sc->sc_iot, sc->sc_ioh, r, 4,
	    BUS_SPACE_BARRIER_READ);
	return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, r));
}

void
mfii_write(struct mfii_softc *sc, bus_size_t r, u_int32_t v)
{
	bus_space_write_4(sc->sc_iot, sc->sc_ioh, r, v);
	bus_space_barrier(sc->sc_iot, sc->sc_ioh, r, 4,
	    BUS_SPACE_BARRIER_WRITE);
}

struct mfii_dmamem *
mfii_dmamem_alloc(struct mfii_softc *sc, size_t size)
{
	struct mfii_dmamem *m;
	int nsegs;

	m = malloc(sizeof(*m), M_DEVBUF, M_NOWAIT | M_ZERO);
	if (m == NULL)
		return (NULL);

	m->mdm_size = size;

	if (bus_dmamap_create(sc->sc_dmat, size, 1, size, 0,
	    BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &m->mdm_map) != 0)
		goto mdmfree;

	if (bus_dmamem_alloc(sc->sc_dmat, size, PAGE_SIZE, 0, &m->mdm_seg, 1,
	    &nsegs, BUS_DMA_NOWAIT | BUS_DMA_ZERO) != 0)
		goto destroy;

	if (bus_dmamem_map(sc->sc_dmat, &m->mdm_seg, nsegs, size, &m->mdm_kva,
	    BUS_DMA_NOWAIT) != 0)
		goto free;

	if (bus_dmamap_load(sc->sc_dmat, m->mdm_map, m->mdm_kva, size, NULL,
	    BUS_DMA_NOWAIT) != 0)
		goto unmap;

	return (m);

unmap:
	bus_dmamem_unmap(sc->sc_dmat, m->mdm_kva, m->mdm_size);
free:
	bus_dmamem_free(sc->sc_dmat, &m->mdm_seg, 1);
destroy:
	bus_dmamap_destroy(sc->sc_dmat, m->mdm_map);
mdmfree:
	free(m, M_DEVBUF);

	return (NULL);
}

void
mfii_dmamem_free(struct mfii_softc *sc, struct mfii_dmamem *m)
{
	bus_dmamap_unload(sc->sc_dmat, m->mdm_map);
	bus_dmamem_unmap(sc->sc_dmat, m->mdm_kva, m->mdm_size);
	bus_dmamem_free(sc->sc_dmat, &m->mdm_seg, 1);
	bus_dmamap_destroy(sc->sc_dmat, m->mdm_map);
	free(m, M_DEVBUF);
}




int
mfii_transition_firmware(struct mfii_softc *sc)
{
	int32_t			fw_state, cur_state;
	int			max_wait, i;

	fw_state = mfii_fw_state(sc) & MFI_STATE_MASK;

	while (fw_state != MFI_STATE_READY) {
		cur_state = fw_state;
		switch (fw_state) {
		case MFI_STATE_FAULT:
			printf("%s: firmware fault\n", DEVNAME(sc));
			return (1);
		case MFI_STATE_WAIT_HANDSHAKE:
			mfii_write(sc, MFI_SKINNY_IDB,
			    MFI_INIT_CLEAR_HANDSHAKE);
			max_wait = 2;
			break;
		case MFI_STATE_OPERATIONAL:
			mfii_write(sc, MFI_SKINNY_IDB, MFI_INIT_READY);
			max_wait = 10;
			break;
		case MFI_STATE_UNDEFINED:
		case MFI_STATE_BB_INIT:
			max_wait = 2;
			break;
		case MFI_STATE_FW_INIT:
		case MFI_STATE_DEVICE_SCAN:
		case MFI_STATE_FLUSH_CACHE:
			max_wait = 20;
			break;
		default:
			printf("%s: unknown firmware state %d\n",
			    DEVNAME(sc), fw_state);
			return (1);
		}
		for (i = 0; i < (max_wait * 10); i++) {
			fw_state = mfii_fw_state(sc) & MFI_STATE_MASK;
			if (fw_state == cur_state)
				DELAY(100000);
			else
				break;
		}
		if (fw_state == cur_state) {
			printf("%s: firmware stuck in state %#x\n",
			    DEVNAME(sc), fw_state);
			return (1);
		}
	}

	return (0);
}

int
mfii_get_info(struct mfii_softc *sc)
{
	if (mfii_mgmt(sc, MR_DCMD_CTRL_GET_INFO, MFII_DATA_IN,
	    sizeof(sc->sc_info), &sc->sc_info, NULL))
		return (1);

#ifdef MFI_DEBUG
	for (i = 0; i < sc->sc_info.mci_image_component_count; i++) {
		printf("%s: active FW %s Version %s date %s time %s\n",
		    DEVNAME(sc),
		    sc->sc_info.mci_image_component[i].mic_name,
		    sc->sc_info.mci_image_component[i].mic_version,
		    sc->sc_info.mci_image_component[i].mic_build_date,
		    sc->sc_info.mci_image_component[i].mic_build_time);
	}

	for (i = 0; i < sc->sc_info.mci_pending_image_component_count; i++) {
		printf("%s: pending FW %s Version %s date %s time %s\n",
		    DEVNAME(sc),
		    sc->sc_info.mci_pending_image_component[i].mic_name,
		    sc->sc_info.mci_pending_image_component[i].mic_version,
		    sc->sc_info.mci_pending_image_component[i].mic_build_date,
		    sc->sc_info.mci_pending_image_component[i].mic_build_time);
	}

	printf("%s: max_arms %d max_spans %d max_arrs %d max_lds %d name %s\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_max_arms,
	    sc->sc_info.mci_max_spans,
	    sc->sc_info.mci_max_arrays,
	    sc->sc_info.mci_max_lds,
	    sc->sc_info.mci_product_name);

	printf("%s: serial %s present %#x fw time %d max_cmds %d max_sg %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_serial_number,
	    sc->sc_info.mci_hw_present,
	    sc->sc_info.mci_current_fw_time,
	    sc->sc_info.mci_max_cmds,
	    sc->sc_info.mci_max_sg_elements);

	printf("%s: max_rq %d lds_pres %d lds_deg %d lds_off %d pd_pres %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_max_request_size,
	    sc->sc_info.mci_lds_present,
	    sc->sc_info.mci_lds_degraded,
	    sc->sc_info.mci_lds_offline,
	    sc->sc_info.mci_pd_present);

	printf("%s: pd_dsk_prs %d pd_dsk_pred_fail %d pd_dsk_fail %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_pd_disks_present,
	    sc->sc_info.mci_pd_disks_pred_failure,
	    sc->sc_info.mci_pd_disks_failed);

	printf("%s: nvram %d mem %d flash %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_nvram_size,
	    sc->sc_info.mci_memory_size,
	    sc->sc_info.mci_flash_size);

	printf("%s: ram_cor %d ram_uncor %d clus_all %d clus_act %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_ram_correctable_errors,
	    sc->sc_info.mci_ram_uncorrectable_errors,
	    sc->sc_info.mci_cluster_allowed,
	    sc->sc_info.mci_cluster_active);

	printf("%s: max_strps_io %d raid_lvl %#x adapt_ops %#x ld_ops %#x\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_max_strips_per_io,
	    sc->sc_info.mci_raid_levels,
	    sc->sc_info.mci_adapter_ops,
	    sc->sc_info.mci_ld_ops);

	printf("%s: strp_sz_min %d strp_sz_max %d pd_ops %#x pd_mix %#x\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_stripe_sz_ops.min,
	    sc->sc_info.mci_stripe_sz_ops.max,
	    sc->sc_info.mci_pd_ops,
	    sc->sc_info.mci_pd_mix_support);

	printf("%s: ecc_bucket %d pckg_prop %s\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_ecc_bucket_count,
	    sc->sc_info.mci_package_version);

	printf("%s: sq_nm %d prd_fail_poll %d intr_thrtl %d intr_thrtl_to %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_properties.mcp_seq_num,
	    sc->sc_info.mci_properties.mcp_pred_fail_poll_interval,
	    sc->sc_info.mci_properties.mcp_intr_throttle_cnt,
	    sc->sc_info.mci_properties.mcp_intr_throttle_timeout);

	printf("%s: rbld_rate %d patr_rd_rate %d bgi_rate %d cc_rate %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_properties.mcp_rebuild_rate,
	    sc->sc_info.mci_properties.mcp_patrol_read_rate,
	    sc->sc_info.mci_properties.mcp_bgi_rate,
	    sc->sc_info.mci_properties.mcp_cc_rate);

	printf("%s: rc_rate %d ch_flsh %d spin_cnt %d spin_dly %d clus_en %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_properties.mcp_recon_rate,
	    sc->sc_info.mci_properties.mcp_cache_flush_interval,
	    sc->sc_info.mci_properties.mcp_spinup_drv_cnt,
	    sc->sc_info.mci_properties.mcp_spinup_delay,
	    sc->sc_info.mci_properties.mcp_cluster_enable);

	printf("%s: coerc %d alarm %d dis_auto_rbld %d dis_bat_wrn %d ecc %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_properties.mcp_coercion_mode,
	    sc->sc_info.mci_properties.mcp_alarm_enable,
	    sc->sc_info.mci_properties.mcp_disable_auto_rebuild,
	    sc->sc_info.mci_properties.mcp_disable_battery_warn,
	    sc->sc_info.mci_properties.mcp_ecc_bucket_size);

	printf("%s: ecc_leak %d rest_hs %d exp_encl_dev %d\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_properties.mcp_ecc_bucket_leak_rate,
	    sc->sc_info.mci_properties.mcp_restore_hotspare_on_insertion,
	    sc->sc_info.mci_properties.mcp_expose_encl_devices);

	printf("%s: vendor %#x device %#x subvendor %#x subdevice %#x\n",
	    DEVNAME(sc),
	    sc->sc_info.mci_pci.mip_vendor,
	    sc->sc_info.mci_pci.mip_device,
	    sc->sc_info.mci_pci.mip_subvendor,
	    sc->sc_info.mci_pci.mip_subdevice);

	printf("%s: type %#x port_count %d port_addr ",
	    DEVNAME(sc),
	    sc->sc_info.mci_host.mih_type,
	    sc->sc_info.mci_host.mih_port_count);

	for (i = 0; i < 8; i++)
		printf("%.0llx ", sc->sc_info.mci_host.mih_port_addr[i]);
	printf("\n");

	printf("%s: type %.x port_count %d port_addr ",
	    DEVNAME(sc),
	    sc->sc_info.mci_device.mid_type,
	    sc->sc_info.mci_device.mid_port_count);

	for (i = 0; i < 8; i++)
		printf("%.0llx ", sc->sc_info.mci_device.mid_port_addr[i]);
	printf("\n");
#endif /* MFI_DEBUG */

	return (0);
}

int
mfii_mfa_poll(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	struct mfi_frame_header	*hdr = ccb->ccb_request;
	u_int64_t r;
	int to = 0, rv = 0;

	hdr->mfh_context = ccb->ccb_smid;
	hdr->mfh_cmd_status = 0xff;
	hdr->mfh_flags |= MFI_FRAME_DONT_POST_IN_REPLY_QUEUE;

	r = MFII_REQ_MFA(ccb->ccb_request_dva);
	memcpy(&ccb->ccb_req, &r, sizeof(ccb->ccb_req));

	mfii_start(sc, ccb);

	for (;;) {
		bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(sc->sc_requests),
		    ccb->ccb_request_offset, MFII_REQUEST_SIZE,
		    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);

		if (hdr->mfh_cmd_status != 0xff)
			break;

		if (to++ > 5000) { /* XXX 5 seconds busywait sucks */
			printf("%s: timeout on ccb %d\n", DEVNAME(sc),
			    ccb->ccb_smid);
			ccb->ccb_flags |= MFI_CCB_F_ERR;
			rv = 1;
			break;
		}

		bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(sc->sc_requests),
		    ccb->ccb_request_offset, MFII_REQUEST_SIZE,
		    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

		delay(1000);
	}

	ccb->ccb_done(sc, ccb);

	return (rv);
}

int
mfii_poll(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	void (*done)(struct mfii_softc *, struct mfii_ccb *);
	void *cookie;
	int rv = 1;

	done = ccb->ccb_done;
	cookie = ccb->ccb_cookie;

	ccb->ccb_done = mfii_poll_done;
	ccb->ccb_cookie = &rv;

	mfii_start(sc, ccb);

	do {
		delay(1);
		mfii_postq(sc);
	} while (rv == 1);

	ccb->ccb_cookie = cookie;
	done(sc, ccb);

	return (0);
}

void
mfii_poll_done(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	int *rv = ccb->ccb_cookie;

	*rv = 0;
}

int
mfii_mgmt(struct mfii_softc *sc, u_int32_t opc, u_int32_t dir, u_int32_t len,
    void *buf, uint8_t *mbox)
{
	struct mfii_ccb *ccb;
	int rv;

	ccb = scsi_io_get(&sc->sc_iopool, 0);
	mfii_scrub_ccb(ccb);
	rv = mfii_do_mgmt(sc, ccb, opc, dir, len, buf, mbox);
	scsi_io_put(&sc->sc_iopool, ccb);

	return (rv);
}

int
mfii_do_mgmt(struct mfii_softc *sc, struct mfii_ccb *ccb, u_int32_t opc,
    u_int32_t dir, u_int32_t len, void *buf, uint8_t *mbox)
{
	struct mfi_dcmd_frame	*dcmd;
	int			rv = EINVAL;
	uint8_t			*dma_buf = NULL;
	//int			s;

	dma_buf = dma_alloc(len, PR_WAITOK);
	if (dma_buf == NULL)
		goto done;

	dcmd = ccb->ccb_request;
	memset(dcmd->mdf_mbox, 0, MFI_MBOX_SIZE);
	dcmd->mdf_header.mfh_cmd = MFI_CMD_DCMD;
	dcmd->mdf_header.mfh_timeout = 0;

	dcmd->mdf_opcode = opc;
	dcmd->mdf_header.mfh_data_len = htole32(0);
	ccb->ccb_direction = dir;
	ccb->ccb_cookie = ccb;
	ccb->ccb_done = mfii_mgmt_done;

	/* handle special opcodes */
	if (mbox)
		memcpy(dcmd->mdf_mbox, mbox, MFI_MBOX_SIZE);

	if (dir != MFII_DATA_NONE) {
		if (dir == MFII_DATA_OUT)
			bcopy(buf, dma_buf, len);
		dcmd->mdf_header.mfh_data_len = htole32(len);
		ccb->ccb_data = dma_buf;
		ccb->ccb_len = len;
		ccb->ccb_sgl = &dcmd->mdf_sgl;

		if (mfii_create_sgl(sc, ccb, BUS_DMA_WAITOK)) {
			rv = EINVAL;
			goto done;
		}
	}

	if (cold) {
		if (mfii_mfa_poll(sc, ccb)) {
			rv = EIO;
			goto done;
		}
	} else {
		panic("%s !cold", __func__);
#if 0
		s = splbio();
		mfii_start(sc, ccb);

		while (ccb->ccb_cookie != NULL)
			tsleep(ccb, PRIBIO, "mfimgmt", 0);
		splx(s);

		if (ccb->ccb_flags & MFI_CCB_F_ERR) {
			rv = EIO;
			goto done;
		}
#endif
	}

	if (dir == MFII_DATA_IN)
		bcopy(dma_buf, buf, len);

	rv = 0;
done:
	if (dma_buf)
		dma_free(dma_buf, len);

	return (rv);
}

void
mfii_mgmt_done(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	struct mfi_frame_header *hdr = ccb->ccb_request;

	if (ccb->ccb_data != NULL) {
		bus_dmamap_sync(sc->sc_dmat, ccb->ccb_dmamap, 0,
		    ccb->ccb_dmamap->dm_mapsize,
		    (ccb->ccb_direction & MFII_DATA_IN) ?
		    BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);

		bus_dmamap_unload(sc->sc_dmat, ccb->ccb_dmamap);
	}

	if (hdr->mfh_cmd_status != MFI_STAT_OK)
		ccb->ccb_flags |= MFI_CCB_F_ERR;

	ccb->ccb_cookie = NULL;

	wakeup(ccb);
}

int 
mfii_create_sgl(struct mfii_softc *sc, struct mfii_ccb *ccb, int flags)
{
	struct mfi_frame_header *hdr;
	bus_dma_segment_t *sgd;
	union mfi_sgl *sgl;
	int error, i;

	if (ccb->ccb_data == NULL)
		return (1);

	error = bus_dmamap_load(sc->sc_dmat, ccb->ccb_dmamap,
	    ccb->ccb_data, ccb->ccb_len, NULL, flags);
	if (error) {
		if (error == EFBIG)   
			printf("more than %d dma segs\n", sc->sc_max_sgl);
		else
			printf("error %d loading dma map\n", error);
		return (1);
	}

	hdr = ccb->ccb_request;
	sgl = ccb->ccb_sgl;
	sgd = ccb->ccb_dmamap->dm_segs;
	for (i = 0; i < ccb->ccb_dmamap->dm_nsegs; i++) {
		sgl->sg32[i].addr = htole32(sgd[i].ds_addr);
		sgl->sg32[i].len = htole32(sgd[i].ds_len);
	}

	if (ccb->ccb_direction == MFII_DATA_IN) {
		hdr->mfh_flags |= MFI_FRAME_DIR_READ;
		bus_dmamap_sync(sc->sc_dmat, ccb->ccb_dmamap, 0,
		    ccb->ccb_dmamap->dm_mapsize, BUS_DMASYNC_PREREAD);
	} else {
		hdr->mfh_flags |= MFI_FRAME_DIR_WRITE;
		bus_dmamap_sync(sc->sc_dmat, ccb->ccb_dmamap, 0,
		    ccb->ccb_dmamap->dm_mapsize, BUS_DMASYNC_PREWRITE);
	}

	hdr->mfh_sg_count = ccb->ccb_dmamap->dm_nsegs;

	return (0);
}

void
mfii_start(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	u_int32_t *r = (u_int32_t *)&ccb->ccb_req;

	bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(sc->sc_requests),
	    ccb->ccb_request_offset, MFII_REQUEST_SIZE,
	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

	mtx_enter(&sc->sc_post_mtx);
	mfii_write(sc, MFI_IQPL, r[0]);
	mfii_write(sc, MFI_IQPH, r[1]);
	mtx_leave(&sc->sc_post_mtx);
}

void
mfii_done(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(sc->sc_requests),
	    ccb->ccb_request_offset, MFII_REQUEST_SIZE,
	    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);

	ccb->ccb_done(sc, ccb);
}

void
mfii_empty_done(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	/* nop */
}

int
mfii_initialise_firmware(struct mfii_softc *sc)
{
	struct mpii_msg_iocinit_request *iiq;
	struct mfii_dmamem *m;
	struct mfii_ccb *ccb;
	struct mfi_init_frame *init;
	int rv;

	m = mfii_dmamem_alloc(sc, sizeof(*iiq));
	if (m == NULL)
		return (1);

	iiq = MFII_DMA_KVA(m);
	bzero(iiq, sizeof(*iiq));

	iiq->function = MPII_FUNCTION_IOC_INIT;
	iiq->whoinit = MPII_WHOINIT_HOST_DRIVER;

	iiq->msg_version_maj = 0x02;
	iiq->msg_version_min = 0x00;
	iiq->hdr_version_unit = 0x10;
	iiq->hdr_version_dev = 0x0;

	iiq->system_request_frame_size = htole16(MFII_REQUEST_SIZE / 4);

	iiq->reply_descriptor_post_queue_depth =
	    htole16(sc->sc_reply_postq_depth);
	iiq->reply_free_queue_depth = htole16(0);

	iiq->sense_buffer_address_high =
	    htole32(MFII_DMA_DVA(sc->sc_sense) >> 32);

	iiq->reply_descriptor_post_queue_address =
	    htole64(MFII_DMA_DVA(sc->sc_reply_postq));

	iiq->system_request_frame_base_address =
	    htole64(MFII_DMA_DVA(sc->sc_requests));

	iiq->timestamp = htole64(time_uptime);

	ccb = scsi_io_get(&sc->sc_iopool, 0);
	mfii_scrub_ccb(ccb);
	init = ccb->ccb_request;

	init->mif_header.mfh_cmd = MFI_CMD_INIT;
	init->mif_header.mfh_data_len = htole32(sizeof(*iiq));
	init->mif_qinfo_new_addr = htole64(MFII_DMA_DVA(m));

	bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(sc->sc_reply_postq),
	    0, MFII_DMA_LEN(sc->sc_reply_postq),
	    BUS_DMASYNC_PREREAD);

	bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(m),
	    0, sizeof(*iiq), BUS_DMASYNC_PREREAD);

	ccb->ccb_done = mfii_empty_done;
	rv = mfii_mfa_poll(sc, ccb);

	bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(m),
	    0, sizeof(*iiq), BUS_DMASYNC_POSTREAD);

	scsi_io_put(&sc->sc_iopool, ccb);
	mfii_dmamem_free(sc, m);

	return (rv);
}

int
mfii_my_intr(struct mfii_softc *sc)
{
	u_int32_t status;

	status = mfii_read(sc, MFI_OSTS);
	if (ISSET(status, 0x1)) {
		mfii_write(sc, MFI_OSTS, status);
		return (1);
	}

	return (ISSET(status, MFII_OSTS_INTR_VALID) ? 1 : 0);
}

int
mfii_intr(void *arg)
{
	struct mfii_softc *sc = arg;

	if (!mfii_my_intr(sc))
		return (0);

	mfii_postq(sc);

	return (1);
}

void
mfii_postq(struct mfii_softc *sc)
{
	struct mpii_reply_descr *postq = MFII_DMA_KVA(sc->sc_reply_postq);
	struct mpii_reply_descr *rdp;
	struct mfii_ccb *ccb;
	int rpi = 0;

	mtx_enter(&sc->sc_reply_postq_mtx);

	bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(sc->sc_reply_postq),
	    0, MFII_DMA_LEN(sc->sc_reply_postq),
	    BUS_DMASYNC_POSTREAD);

	for (;;) {
		rdp = &postq[sc->sc_reply_postq_index];
		if ((rdp->reply_flags & MPII_REPLY_DESCR_TYPE_MASK) ==
		    MPII_REPLY_DESCR_UNUSED)
			break;
		if (rdp->data == 0xffffffff) {
			/*
			 * ioc is still writing to the reply post queue
			 * race condition - bail!
			 */
			break;
		}

		ccb = &sc->sc_ccb[letoh16(rdp->smid) - 1];
		mfii_done(sc, ccb);
		memset(rdp, 0xff, sizeof(*rdp));

		sc->sc_reply_postq_index++;
		sc->sc_reply_postq_index %= sc->sc_reply_postq_depth;
		rpi = 1;
	}

	bus_dmamap_sync(sc->sc_dmat, MFII_DMA_MAP(sc->sc_reply_postq),
	    0, MFII_DMA_LEN(sc->sc_reply_postq),
	    BUS_DMASYNC_PREREAD);

	if (rpi)
		mfii_write(sc, MFII_RPI, sc->sc_reply_postq_index);

	mtx_leave(&sc->sc_reply_postq_mtx);
}

void
mfii_scsi_cmd(struct scsi_xfer *xs)
{
	struct scsi_link *link = xs->sc_link;
	struct mfii_softc *sc = link->adapter_softc;
	struct mfii_ccb *ccb = xs->io;

	mfii_scrub_ccb(ccb);
	ccb->ccb_cookie = xs;
	ccb->ccb_done = mfii_scsi_cmd_done;
	ccb->ccb_data = xs->data;
	ccb->ccb_len = xs->datalen;

#if 0
	switch (xs->cmd->opcode) {
	case READ_COMMAND:
	case READ_BIG:
	case READ_12:
	case READ_16:
	case WRITE_COMMAND:
	case WRITE_BIG:
	case WRITE_12:
	case WRITE_16:
		if (mfii_scsi_cmd_io(sc, xs) != 0)
			goto stuffup;

		break;

	default:
#endif
		if (mfii_scsi_cmd_cdb(sc, xs) != 0)
			goto stuffup;
#if 0
		break;
	}
#endif

	xs->error = XS_NOERROR;
	xs->resid = 0;

	if (ISSET(xs->flags, SCSI_POLL)) {
		if (mfii_poll(sc, ccb) != 0) {
			xs->error = XS_DRIVER_STUFFUP;
			scsi_done(xs);
		}
		return;
	}

	mfii_start(sc, ccb);
	return;

stuffup:
	xs->error = XS_DRIVER_STUFFUP;
	scsi_done(xs);
}

void
mfii_scsi_cmd_done(struct mfii_softc *sc, struct mfii_ccb *ccb)
{
	struct scsi_xfer *xs = ccb->ccb_cookie;
	bus_dmamap_t dmap = ccb->ccb_dmamap;
	struct mpii_msg_scsi_io *io = ccb->ccb_request;
	struct mfii_raid_context *ctx = (struct mfii_raid_context *)(io + 1);

	if (ccb->ccb_len != 0) {
		bus_dmamap_sync(sc->sc_dmat, dmap, 0, dmap->dm_mapsize,
		    ccb->ccb_direction == MFII_DATA_OUT ?
		    BUS_DMASYNC_PREWRITE : BUS_DMASYNC_PREREAD);
		bus_dmamap_unload(sc->sc_dmat, dmap);
	}

	switch (ctx->status) {
        case MFI_STAT_OK:
                break;

        case MFI_STAT_SCSI_DONE_WITH_ERROR:
                xs->error = XS_SENSE;
                memset(&xs->sense, 0, sizeof(xs->sense));
                memcpy(&xs->sense, ccb->ccb_sense, sizeof(xs->sense));
                break;

	case MFI_STAT_LD_OFFLINE:
	case MFI_STAT_DEVICE_NOT_FOUND:
                xs->error = XS_SELTIMEOUT;
		break;

        default:
                xs->error = XS_DRIVER_STUFFUP;
                break;
        }

	scsi_done(xs);
}

int
mfii_scsi_cmd_io(struct mfii_softc *sc, struct scsi_xfer *xs)
{
	struct mfii_ccb *ccb = xs->io;
	u_int64_t blkno;
	u_int32_t nblks;

	ccb->ccb_req.flags = MFII_REQ_TYPE_LDIO;
	ccb->ccb_req.smid = letoh16(ccb->ccb_smid);

	scsi_cmd_rw_decode(xs->cmd, &blkno, &nblks);

	return (1);
}

int
mfii_scsi_cmd_cdb(struct mfii_softc *sc, struct scsi_xfer *xs)
{
	struct scsi_link *link = xs->sc_link;
	struct mfii_ccb *ccb = xs->io;
	struct mpii_msg_scsi_io *io = ccb->ccb_request;
	struct mfii_raid_context *ctx = (struct mfii_raid_context *)(io + 1);

	io->dev_handle = htole16(link->target);
	io->function = MFII_FUNCTION_LDIO_REQUEST;
	io->sense_buffer_low_address = htole32(ccb->ccb_sense_dva);
	io->sgl_flags = htole16(0x02); /* XXX */
	io->sense_buffer_length = sizeof(xs->sense);
	io->sgl_offset0 = (sizeof(*io) + sizeof(*ctx)) / 4;
	io->data_length = htole32(xs->datalen);
	io->io_flags = htole16(xs->cmdlen);
	io->lun[0] = htobe16(link->lun);
	switch (xs->flags & (SCSI_DATA_IN | SCSI_DATA_OUT)) {
	case SCSI_DATA_IN:
		ccb->ccb_direction = MFII_DATA_IN;
		io->direction = MPII_SCSIIO_DIR_READ;
		break;
	case SCSI_DATA_OUT:
		ccb->ccb_direction = MFII_DATA_OUT;
		io->direction = MPII_SCSIIO_DIR_WRITE;
		break;
	default:
		ccb->ccb_direction = MFII_DATA_NONE;
		io->direction = MPII_SCSIIO_DIR_NONE;
		break;
	}
	bcopy(xs->cmd, io->cdb, xs->cmdlen);

	ctx->virtual_disk_target_id = htole16(link->target);

	if (mfii_load_ccb(sc, ccb, ctx + 1,
	    ISSET(xs->flags, SCSI_NOSLEEP)) != 0)
		return (1);

	ctx->num_sge = (ccb->ccb_len == 0) ? 0 : ccb->ccb_dmamap->dm_nsegs;

	ccb->ccb_req.flags = MFII_REQ_TYPE_SCSI;
	ccb->ccb_req.smid = letoh16(ccb->ccb_smid);

	return (0);
}

int
mfii_load_ccb(struct mfii_softc *sc, struct mfii_ccb *ccb, void *sglp,
    int nosleep)
{
	struct mfii_sge *sge = NULL, *nsge = sglp;
	bus_dmamap_t dmap = ccb->ccb_dmamap;
	int i;

	int error;

	if (ccb->ccb_len == 0)
		return (0);

	error = bus_dmamap_load(sc->sc_dmat, dmap,
	    ccb->ccb_data, ccb->ccb_len, NULL,
	    nosleep ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK);
        if (error) {
                printf("%s: error %d loading dmamap\n", DEVNAME(sc), error);
                return (1);
        }

	for (i = 0; i < dmap->dm_nsegs; i++) {
		sge = nsge;

		sge->sg_addr = htole64(dmap->dm_segs[i].ds_addr);
		sge->sg_len = htole32(dmap->dm_segs[i].ds_len);

		nsge = sge + 1;
	}

	bus_dmamap_sync(sc->sc_dmat, dmap, 0, dmap->dm_mapsize,
	    ccb->ccb_direction == MFII_DATA_OUT ?
	    BUS_DMASYNC_PREWRITE : BUS_DMASYNC_PREREAD);

	return (0);
}

void *
mfii_get_ccb(void *cookie)
{
	struct mfii_softc *sc = cookie;
	struct mfii_ccb *ccb;

	mtx_enter(&sc->sc_ccb_mtx);
	ccb = SLIST_FIRST(&sc->sc_ccb_freeq);
	if (ccb != NULL)
		SLIST_REMOVE_HEAD(&sc->sc_ccb_freeq, ccb_link);
	mtx_leave(&sc->sc_ccb_mtx);

	return (ccb);
}

void
mfii_scrub_ccb(struct mfii_ccb *ccb)
{
	ccb->ccb_cookie = NULL;
	ccb->ccb_flags = 0;
	ccb->ccb_done = NULL;
	ccb->ccb_direction = 0;
	ccb->ccb_sgl = NULL;
	ccb->ccb_data = NULL;
	ccb->ccb_len = 0;

	bzero(&ccb->ccb_req, sizeof(ccb->ccb_req));
	bzero(ccb->ccb_request, MFII_REQUEST_SIZE);
}

void
mfii_put_ccb(void *cookie, void *io)
{
	struct mfii_softc *sc = cookie;
	struct mfii_ccb *ccb = io;

	mtx_enter(&sc->sc_ccb_mtx);
	SLIST_INSERT_HEAD(&sc->sc_ccb_freeq, ccb, ccb_link);
	mtx_leave(&sc->sc_ccb_mtx);
}

int
mfii_init_ccb(struct mfii_softc *sc)
{
	struct mfii_ccb *ccb;
	u_int8_t *request = MFII_DMA_KVA(sc->sc_requests);
	u_int8_t *sense = MFII_DMA_KVA(sc->sc_sense);
	u_int32_t i;
	int max_sgl;
	int error;

	max_sgl = (MFII_REQUEST_SIZE - (sizeof(struct mpii_msg_scsi_io) +
	    sizeof(struct mfii_raid_context))) / sizeof(struct mpii_sge);

	sc->sc_ccb = malloc(sizeof(struct mfii_ccb) * sc->sc_max_cmds,
	    M_DEVBUF, M_WAITOK|M_ZERO);

	for (i = 1; i <= sc->sc_max_cmds; i++) {
		ccb = &sc->sc_ccb[i - 1];

		/* create a dma map for transfer */
		error = bus_dmamap_create(sc->sc_dmat,
		    // MAXPHYS, sc->sc_max_sgl, MAXPHYS, 0,
		    MAXPHYS, max_sgl, MAXPHYS, 0,
		    BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &ccb->ccb_dmamap);
		if (error) {
			printf("%s: cannot create ccb dmamap (%d)\n",
			    DEVNAME(sc), error);
			goto destroy;
		}

		/* select i'th request */
		ccb->ccb_smid = i;
		ccb->ccb_request_offset = MFII_REQUEST_SIZE * i;
		ccb->ccb_request = request + ccb->ccb_request_offset;
		ccb->ccb_request_dva = MFII_DMA_DVA(sc->sc_requests) +
		    ccb->ccb_request_offset;

		/* select i'th sense */
		ccb->ccb_sense_offset = MFI_SENSE_SIZE * (i - 1);
		ccb->ccb_sense = (struct mfi_sense *)(sense + 
		    ccb->ccb_sense_offset);
		ccb->ccb_sense_dva = (u_int32_t)(MFII_DMA_DVA(sc->sc_sense) +
		    ccb->ccb_sense_offset);

		/* add ccb to queue */
		mfii_put_ccb(sc, ccb);
	}

	return (0);

destroy:
	/* free dma maps and ccb memory */
	while ((ccb = mfii_get_ccb(sc)) != NULL)
		bus_dmamap_destroy(sc->sc_dmat, ccb->ccb_dmamap);

	free(sc->sc_ccb, M_DEVBUF);

	return (1);
}