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sx8.c
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/*
* sx8.c: Driver for Promise SATA SX8 looks-like-I2O hardware
*
* Copyright 2004-2005 Red Hat, Inc.
*
* Author/maintainer: Jeff Garzik <[email protected]>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/compiler.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/hdreg.h>
#include <linux/dma-mapping.h>
#include <linux/completion.h>
#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#if 0
#define CARM_DEBUG
#define CARM_VERBOSE_DEBUG
#else
#undef CARM_DEBUG
#undef CARM_VERBOSE_DEBUG
#endif
#undef CARM_NDEBUG
#define DRV_NAME "sx8"
#define DRV_VERSION "1.0"
#define PFX DRV_NAME ": "
MODULE_AUTHOR("Jeff Garzik");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Promise SATA SX8 block driver");
MODULE_VERSION(DRV_VERSION);
/*
* SX8 hardware has a single message queue for all ATA ports.
* When this driver was written, the hardware (firmware?) would
* corrupt data eventually, if more than one request was outstanding.
* As one can imagine, having 8 ports bottlenecking on a single
* command hurts performance.
*
* Based on user reports, later versions of the hardware (firmware?)
* seem to be able to survive with more than one command queued.
*
* Therefore, we default to the safe option -- 1 command -- but
* allow the user to increase this.
*
* SX8 should be able to support up to ~60 queued commands (CARM_MAX_REQ),
* but problems seem to occur when you exceed ~30, even on newer hardware.
*/
static int max_queue = 1;
module_param(max_queue, int, 0444);
MODULE_PARM_DESC(max_queue, "Maximum number of queued commands. (min==1, max==30, safe==1)");
#define NEXT_RESP(idx) ((idx + 1) % RMSG_Q_LEN)
/* 0xf is just arbitrary, non-zero noise; this is sorta like poisoning */
#define TAG_ENCODE(tag) (((tag) << 16) | 0xf)
#define TAG_DECODE(tag) (((tag) >> 16) & 0x1f)
#define TAG_VALID(tag) ((((tag) & 0xf) == 0xf) && (TAG_DECODE(tag) < 32))
/* note: prints function name for you */
#ifdef CARM_DEBUG
#define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
#ifdef CARM_VERBOSE_DEBUG
#define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ## args)
#else
#define VPRINTK(fmt, args...)
#endif /* CARM_VERBOSE_DEBUG */
#else
#define DPRINTK(fmt, args...)
#define VPRINTK(fmt, args...)
#endif /* CARM_DEBUG */
#ifdef CARM_NDEBUG
#define assert(expr)
#else
#define assert(expr) \
if(unlikely(!(expr))) { \
printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
#expr, __FILE__, __func__, __LINE__); \
}
#endif
/* defines only for the constants which don't work well as enums */
struct carm_host;
enum {
/* adapter-wide limits */
CARM_MAX_PORTS = 8,
CARM_SHM_SIZE = (4096 << 7),
CARM_MINORS_PER_MAJOR = 256 / CARM_MAX_PORTS,
CARM_MAX_WAIT_Q = CARM_MAX_PORTS + 1,
/* command message queue limits */
CARM_MAX_REQ = 64, /* max command msgs per host */
CARM_MSG_LOW_WATER = (CARM_MAX_REQ / 4), /* refill mark */
/* S/G limits, host-wide and per-request */
CARM_MAX_REQ_SG = 32, /* max s/g entries per request */
CARM_MAX_HOST_SG = 600, /* max s/g entries per host */
CARM_SG_LOW_WATER = (CARM_MAX_HOST_SG / 4), /* re-fill mark */
/* hardware registers */
CARM_IHQP = 0x1c,
CARM_INT_STAT = 0x10, /* interrupt status */
CARM_INT_MASK = 0x14, /* interrupt mask */
CARM_HMUC = 0x18, /* host message unit control */
RBUF_ADDR_LO = 0x20, /* response msg DMA buf low 32 bits */
RBUF_ADDR_HI = 0x24, /* response msg DMA buf high 32 bits */
RBUF_BYTE_SZ = 0x28,
CARM_RESP_IDX = 0x2c,
CARM_CMS0 = 0x30, /* command message size reg 0 */
CARM_LMUC = 0x48,
CARM_HMPHA = 0x6c,
CARM_INITC = 0xb5,
/* bits in CARM_INT_{STAT,MASK} */
INT_RESERVED = 0xfffffff0,
INT_WATCHDOG = (1 << 3), /* watchdog timer */
INT_Q_OVERFLOW = (1 << 2), /* cmd msg q overflow */
INT_Q_AVAILABLE = (1 << 1), /* cmd msg q has free space */
INT_RESPONSE = (1 << 0), /* response msg available */
INT_ACK_MASK = INT_WATCHDOG | INT_Q_OVERFLOW,
INT_DEF_MASK = INT_RESERVED | INT_Q_OVERFLOW |
INT_RESPONSE,
/* command messages, and related register bits */
CARM_HAVE_RESP = 0x01,
CARM_MSG_READ = 1,
CARM_MSG_WRITE = 2,
CARM_MSG_VERIFY = 3,
CARM_MSG_GET_CAPACITY = 4,
CARM_MSG_FLUSH = 5,
CARM_MSG_IOCTL = 6,
CARM_MSG_ARRAY = 8,
CARM_MSG_MISC = 9,
CARM_CME = (1 << 2),
CARM_RME = (1 << 1),
CARM_WZBC = (1 << 0),
CARM_RMI = (1 << 0),
CARM_Q_FULL = (1 << 3),
CARM_MSG_SIZE = 288,
CARM_Q_LEN = 48,
/* CARM_MSG_IOCTL messages */
CARM_IOC_SCAN_CHAN = 5, /* scan channels for devices */
CARM_IOC_GET_TCQ = 13, /* get tcq/ncq depth */
CARM_IOC_SET_TCQ = 14, /* set tcq/ncq depth */
IOC_SCAN_CHAN_NODEV = 0x1f,
IOC_SCAN_CHAN_OFFSET = 0x40,
/* CARM_MSG_ARRAY messages */
CARM_ARRAY_INFO = 0,
ARRAY_NO_EXIST = (1 << 31),
/* response messages */
RMSG_SZ = 8, /* sizeof(struct carm_response) */
RMSG_Q_LEN = 48, /* resp. msg list length */
RMSG_OK = 1, /* bit indicating msg was successful */
/* length of entire resp. msg buffer */
RBUF_LEN = RMSG_SZ * RMSG_Q_LEN,
PDC_SHM_SIZE = (4096 << 7), /* length of entire h/w buffer */
/* CARM_MSG_MISC messages */
MISC_GET_FW_VER = 2,
MISC_ALLOC_MEM = 3,
MISC_SET_TIME = 5,
/* MISC_GET_FW_VER feature bits */
FW_VER_4PORT = (1 << 2), /* 1=4 ports, 0=8 ports */
FW_VER_NON_RAID = (1 << 1), /* 1=non-RAID firmware, 0=RAID */
FW_VER_ZCR = (1 << 0), /* zero channel RAID (whatever that is) */
/* carm_host flags */
FL_NON_RAID = FW_VER_NON_RAID,
FL_4PORT = FW_VER_4PORT,
FL_FW_VER_MASK = (FW_VER_NON_RAID | FW_VER_4PORT),
FL_DAC = (1 << 16),
FL_DYN_MAJOR = (1 << 17),
};
enum {
CARM_SG_BOUNDARY = 0xffffUL, /* s/g segment boundary */
};
enum scatter_gather_types {
SGT_32BIT = 0,
SGT_64BIT = 1,
};
enum host_states {
HST_INVALID, /* invalid state; never used */
HST_ALLOC_BUF, /* setting up master SHM area */
HST_ERROR, /* we never leave here */
HST_PORT_SCAN, /* start dev scan */
HST_DEV_SCAN_START, /* start per-device probe */
HST_DEV_SCAN, /* continue per-device probe */
HST_DEV_ACTIVATE, /* activate devices we found */
HST_PROBE_FINISHED, /* probe is complete */
HST_PROBE_START, /* initiate probe */
HST_SYNC_TIME, /* tell firmware what time it is */
HST_GET_FW_VER, /* get firmware version, adapter port cnt */
};
#ifdef CARM_DEBUG
static const char *state_name[] = {
"HST_INVALID",
"HST_ALLOC_BUF",
"HST_ERROR",
"HST_PORT_SCAN",
"HST_DEV_SCAN_START",
"HST_DEV_SCAN",
"HST_DEV_ACTIVATE",
"HST_PROBE_FINISHED",
"HST_PROBE_START",
"HST_SYNC_TIME",
"HST_GET_FW_VER",
};
#endif
struct carm_port {
unsigned int port_no;
struct gendisk *disk;
struct carm_host *host;
/* attached device characteristics */
u64 capacity;
char name[41];
u16 dev_geom_head;
u16 dev_geom_sect;
u16 dev_geom_cyl;
};
struct carm_request {
unsigned int tag;
int n_elem;
unsigned int msg_type;
unsigned int msg_subtype;
unsigned int msg_bucket;
struct request *rq;
struct carm_port *port;
struct scatterlist sg[CARM_MAX_REQ_SG];
};
struct carm_host {
unsigned long flags;
void __iomem *mmio;
void *shm;
dma_addr_t shm_dma;
int major;
int id;
char name[32];
spinlock_t lock;
struct pci_dev *pdev;
unsigned int state;
u32 fw_ver;
struct request_queue *oob_q;
unsigned int n_oob;
unsigned int hw_sg_used;
unsigned int resp_idx;
unsigned int wait_q_prod;
unsigned int wait_q_cons;
struct request_queue *wait_q[CARM_MAX_WAIT_Q];
unsigned int n_msgs;
u64 msg_alloc;
struct carm_request req[CARM_MAX_REQ];
void *msg_base;
dma_addr_t msg_dma;
int cur_scan_dev;
unsigned long dev_active;
unsigned long dev_present;
struct carm_port port[CARM_MAX_PORTS];
struct work_struct fsm_task;
struct completion probe_comp;
};
struct carm_response {
__le32 ret_handle;
__le32 status;
} __attribute__((packed));
struct carm_msg_sg {
__le32 start;
__le32 len;
} __attribute__((packed));
struct carm_msg_rw {
u8 type;
u8 id;
u8 sg_count;
u8 sg_type;
__le32 handle;
__le32 lba;
__le16 lba_count;
__le16 lba_high;
struct carm_msg_sg sg[32];
} __attribute__((packed));
struct carm_msg_allocbuf {
u8 type;
u8 subtype;
u8 n_sg;
u8 sg_type;
__le32 handle;
__le32 addr;
__le32 len;
__le32 evt_pool;
__le32 n_evt;
__le32 rbuf_pool;
__le32 n_rbuf;
__le32 msg_pool;
__le32 n_msg;
struct carm_msg_sg sg[8];
} __attribute__((packed));
struct carm_msg_ioctl {
u8 type;
u8 subtype;
u8 array_id;
u8 reserved1;
__le32 handle;
__le32 data_addr;
u32 reserved2;
} __attribute__((packed));
struct carm_msg_sync_time {
u8 type;
u8 subtype;
u16 reserved1;
__le32 handle;
u32 reserved2;
__le32 timestamp;
} __attribute__((packed));
struct carm_msg_get_fw_ver {
u8 type;
u8 subtype;
u16 reserved1;
__le32 handle;
__le32 data_addr;
u32 reserved2;
} __attribute__((packed));
struct carm_fw_ver {
__le32 version;
u8 features;
u8 reserved1;
u16 reserved2;
} __attribute__((packed));
struct carm_array_info {
__le32 size;
__le16 size_hi;
__le16 stripe_size;
__le32 mode;
__le16 stripe_blk_sz;
__le16 reserved1;
__le16 cyl;
__le16 head;
__le16 sect;
u8 array_id;
u8 reserved2;
char name[40];
__le32 array_status;
/* device list continues beyond this point? */
} __attribute__((packed));
static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
static void carm_remove_one (struct pci_dev *pdev);
static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo);
static const struct pci_device_id carm_pci_tbl[] = {
{ PCI_VENDOR_ID_PROMISE, 0x8000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
{ PCI_VENDOR_ID_PROMISE, 0x8002, PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
{ } /* terminate list */
};
MODULE_DEVICE_TABLE(pci, carm_pci_tbl);
static struct pci_driver carm_driver = {
.name = DRV_NAME,
.id_table = carm_pci_tbl,
.probe = carm_init_one,
.remove = carm_remove_one,
};
static const struct block_device_operations carm_bd_ops = {
.owner = THIS_MODULE,
.getgeo = carm_bdev_getgeo,
};
static unsigned int carm_host_id;
static unsigned long carm_major_alloc;
static int carm_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
struct carm_port *port = bdev->bd_disk->private_data;
geo->heads = (u8) port->dev_geom_head;
geo->sectors = (u8) port->dev_geom_sect;
geo->cylinders = port->dev_geom_cyl;
return 0;
}
static const u32 msg_sizes[] = { 32, 64, 128, CARM_MSG_SIZE };
static inline int carm_lookup_bucket(u32 msg_size)
{
int i;
for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
if (msg_size <= msg_sizes[i])
return i;
return -ENOENT;
}
static void carm_init_buckets(void __iomem *mmio)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(msg_sizes); i++)
writel(msg_sizes[i], mmio + CARM_CMS0 + (4 * i));
}
static inline void *carm_ref_msg(struct carm_host *host,
unsigned int msg_idx)
{
return host->msg_base + (msg_idx * CARM_MSG_SIZE);
}
static inline dma_addr_t carm_ref_msg_dma(struct carm_host *host,
unsigned int msg_idx)
{
return host->msg_dma + (msg_idx * CARM_MSG_SIZE);
}
static int carm_send_msg(struct carm_host *host,
struct carm_request *crq)
{
void __iomem *mmio = host->mmio;
u32 msg = (u32) carm_ref_msg_dma(host, crq->tag);
u32 cm_bucket = crq->msg_bucket;
u32 tmp;
int rc = 0;
VPRINTK("ENTER\n");
tmp = readl(mmio + CARM_HMUC);
if (tmp & CARM_Q_FULL) {
#if 0
tmp = readl(mmio + CARM_INT_MASK);
tmp |= INT_Q_AVAILABLE;
writel(tmp, mmio + CARM_INT_MASK);
readl(mmio + CARM_INT_MASK); /* flush */
#endif
DPRINTK("host msg queue full\n");
rc = -EBUSY;
} else {
writel(msg | (cm_bucket << 1), mmio + CARM_IHQP);
readl(mmio + CARM_IHQP); /* flush */
}
return rc;
}
static struct carm_request *carm_get_request(struct carm_host *host)
{
unsigned int i;
/* obey global hardware limit on S/G entries */
if (host->hw_sg_used >= (CARM_MAX_HOST_SG - CARM_MAX_REQ_SG))
return NULL;
for (i = 0; i < max_queue; i++)
if ((host->msg_alloc & (1ULL << i)) == 0) {
struct carm_request *crq = &host->req[i];
crq->port = NULL;
crq->n_elem = 0;
host->msg_alloc |= (1ULL << i);
host->n_msgs++;
assert(host->n_msgs <= CARM_MAX_REQ);
sg_init_table(crq->sg, CARM_MAX_REQ_SG);
return crq;
}
DPRINTK("no request available, returning NULL\n");
return NULL;
}
static int carm_put_request(struct carm_host *host, struct carm_request *crq)
{
assert(crq->tag < max_queue);
if (unlikely((host->msg_alloc & (1ULL << crq->tag)) == 0))
return -EINVAL; /* tried to clear a tag that was not active */
assert(host->hw_sg_used >= crq->n_elem);
host->msg_alloc &= ~(1ULL << crq->tag);
host->hw_sg_used -= crq->n_elem;
host->n_msgs--;
return 0;
}
static struct carm_request *carm_get_special(struct carm_host *host)
{
unsigned long flags;
struct carm_request *crq = NULL;
struct request *rq;
int tries = 5000;
while (tries-- > 0) {
spin_lock_irqsave(&host->lock, flags);
crq = carm_get_request(host);
spin_unlock_irqrestore(&host->lock, flags);
if (crq)
break;
msleep(10);
}
if (!crq)
return NULL;
rq = blk_get_request(host->oob_q, WRITE /* bogus */, GFP_KERNEL);
if (!rq) {
spin_lock_irqsave(&host->lock, flags);
carm_put_request(host, crq);
spin_unlock_irqrestore(&host->lock, flags);
return NULL;
}
crq->rq = rq;
return crq;
}
static int carm_array_info (struct carm_host *host, unsigned int array_idx)
{
struct carm_msg_ioctl *ioc;
unsigned int idx;
u32 msg_data;
dma_addr_t msg_dma;
struct carm_request *crq;
int rc;
crq = carm_get_special(host);
if (!crq) {
rc = -ENOMEM;
goto err_out;
}
idx = crq->tag;
ioc = carm_ref_msg(host, idx);
msg_dma = carm_ref_msg_dma(host, idx);
msg_data = (u32) (msg_dma + sizeof(struct carm_array_info));
crq->msg_type = CARM_MSG_ARRAY;
crq->msg_subtype = CARM_ARRAY_INFO;
rc = carm_lookup_bucket(sizeof(struct carm_msg_ioctl) +
sizeof(struct carm_array_info));
BUG_ON(rc < 0);
crq->msg_bucket = (u32) rc;
memset(ioc, 0, sizeof(*ioc));
ioc->type = CARM_MSG_ARRAY;
ioc->subtype = CARM_ARRAY_INFO;
ioc->array_id = (u8) array_idx;
ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
ioc->data_addr = cpu_to_le32(msg_data);
spin_lock_irq(&host->lock);
assert(host->state == HST_DEV_SCAN_START ||
host->state == HST_DEV_SCAN);
spin_unlock_irq(&host->lock);
DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
crq->rq->cmd_type = REQ_TYPE_SPECIAL;
crq->rq->special = crq;
blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
return 0;
err_out:
spin_lock_irq(&host->lock);
host->state = HST_ERROR;
spin_unlock_irq(&host->lock);
return rc;
}
typedef unsigned int (*carm_sspc_t)(struct carm_host *, unsigned int, void *);
static int carm_send_special (struct carm_host *host, carm_sspc_t func)
{
struct carm_request *crq;
struct carm_msg_ioctl *ioc;
void *mem;
unsigned int idx, msg_size;
int rc;
crq = carm_get_special(host);
if (!crq)
return -ENOMEM;
idx = crq->tag;
mem = carm_ref_msg(host, idx);
msg_size = func(host, idx, mem);
ioc = mem;
crq->msg_type = ioc->type;
crq->msg_subtype = ioc->subtype;
rc = carm_lookup_bucket(msg_size);
BUG_ON(rc < 0);
crq->msg_bucket = (u32) rc;
DPRINTK("blk_execute_rq_nowait, tag == %u\n", idx);
crq->rq->cmd_type = REQ_TYPE_SPECIAL;
crq->rq->special = crq;
blk_execute_rq_nowait(host->oob_q, NULL, crq->rq, true, NULL);
return 0;
}
static unsigned int carm_fill_sync_time(struct carm_host *host,
unsigned int idx, void *mem)
{
struct timeval tv;
struct carm_msg_sync_time *st = mem;
do_gettimeofday(&tv);
memset(st, 0, sizeof(*st));
st->type = CARM_MSG_MISC;
st->subtype = MISC_SET_TIME;
st->handle = cpu_to_le32(TAG_ENCODE(idx));
st->timestamp = cpu_to_le32(tv.tv_sec);
return sizeof(struct carm_msg_sync_time);
}
static unsigned int carm_fill_alloc_buf(struct carm_host *host,
unsigned int idx, void *mem)
{
struct carm_msg_allocbuf *ab = mem;
memset(ab, 0, sizeof(*ab));
ab->type = CARM_MSG_MISC;
ab->subtype = MISC_ALLOC_MEM;
ab->handle = cpu_to_le32(TAG_ENCODE(idx));
ab->n_sg = 1;
ab->sg_type = SGT_32BIT;
ab->addr = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
ab->len = cpu_to_le32(PDC_SHM_SIZE >> 1);
ab->evt_pool = cpu_to_le32(host->shm_dma + (16 * 1024));
ab->n_evt = cpu_to_le32(1024);
ab->rbuf_pool = cpu_to_le32(host->shm_dma);
ab->n_rbuf = cpu_to_le32(RMSG_Q_LEN);
ab->msg_pool = cpu_to_le32(host->shm_dma + RBUF_LEN);
ab->n_msg = cpu_to_le32(CARM_Q_LEN);
ab->sg[0].start = cpu_to_le32(host->shm_dma + (PDC_SHM_SIZE >> 1));
ab->sg[0].len = cpu_to_le32(65536);
return sizeof(struct carm_msg_allocbuf);
}
static unsigned int carm_fill_scan_channels(struct carm_host *host,
unsigned int idx, void *mem)
{
struct carm_msg_ioctl *ioc = mem;
u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) +
IOC_SCAN_CHAN_OFFSET);
memset(ioc, 0, sizeof(*ioc));
ioc->type = CARM_MSG_IOCTL;
ioc->subtype = CARM_IOC_SCAN_CHAN;
ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
ioc->data_addr = cpu_to_le32(msg_data);
/* fill output data area with "no device" default values */
mem += IOC_SCAN_CHAN_OFFSET;
memset(mem, IOC_SCAN_CHAN_NODEV, CARM_MAX_PORTS);
return IOC_SCAN_CHAN_OFFSET + CARM_MAX_PORTS;
}
static unsigned int carm_fill_get_fw_ver(struct carm_host *host,
unsigned int idx, void *mem)
{
struct carm_msg_get_fw_ver *ioc = mem;
u32 msg_data = (u32) (carm_ref_msg_dma(host, idx) + sizeof(*ioc));
memset(ioc, 0, sizeof(*ioc));
ioc->type = CARM_MSG_MISC;
ioc->subtype = MISC_GET_FW_VER;
ioc->handle = cpu_to_le32(TAG_ENCODE(idx));
ioc->data_addr = cpu_to_le32(msg_data);
return sizeof(struct carm_msg_get_fw_ver) +
sizeof(struct carm_fw_ver);
}
static inline void carm_end_request_queued(struct carm_host *host,
struct carm_request *crq,
int error)
{
struct request *req = crq->rq;
int rc;
__blk_end_request_all(req, error);
rc = carm_put_request(host, crq);
assert(rc == 0);
}
static inline void carm_push_q (struct carm_host *host, struct request_queue *q)
{
unsigned int idx = host->wait_q_prod % CARM_MAX_WAIT_Q;
blk_stop_queue(q);
VPRINTK("STOPPED QUEUE %p\n", q);
host->wait_q[idx] = q;
host->wait_q_prod++;
BUG_ON(host->wait_q_prod == host->wait_q_cons); /* overrun */
}
static inline struct request_queue *carm_pop_q(struct carm_host *host)
{
unsigned int idx;
if (host->wait_q_prod == host->wait_q_cons)
return NULL;
idx = host->wait_q_cons % CARM_MAX_WAIT_Q;
host->wait_q_cons++;
return host->wait_q[idx];
}
static inline void carm_round_robin(struct carm_host *host)
{
struct request_queue *q = carm_pop_q(host);
if (q) {
blk_start_queue(q);
VPRINTK("STARTED QUEUE %p\n", q);
}
}
static inline void carm_end_rq(struct carm_host *host, struct carm_request *crq,
int error)
{
carm_end_request_queued(host, crq, error);
if (max_queue == 1)
carm_round_robin(host);
else if ((host->n_msgs <= CARM_MSG_LOW_WATER) &&
(host->hw_sg_used <= CARM_SG_LOW_WATER)) {
carm_round_robin(host);
}
}
static void carm_oob_rq_fn(struct request_queue *q)
{
struct carm_host *host = q->queuedata;
struct carm_request *crq;
struct request *rq;
int rc;
while (1) {
DPRINTK("get req\n");
rq = blk_fetch_request(q);
if (!rq)
break;
crq = rq->special;
assert(crq != NULL);
assert(crq->rq == rq);
crq->n_elem = 0;
DPRINTK("send req\n");
rc = carm_send_msg(host, crq);
if (rc) {
blk_requeue_request(q, rq);
carm_push_q(host, q);
return; /* call us again later, eventually */
}
}
}
static void carm_rq_fn(struct request_queue *q)
{
struct carm_port *port = q->queuedata;
struct carm_host *host = port->host;
struct carm_msg_rw *msg;
struct carm_request *crq;
struct request *rq;
struct scatterlist *sg;
int writing = 0, pci_dir, i, n_elem, rc;
u32 tmp;
unsigned int msg_size;
queue_one_request:
VPRINTK("get req\n");
rq = blk_peek_request(q);
if (!rq)
return;
crq = carm_get_request(host);
if (!crq) {
carm_push_q(host, q);
return; /* call us again later, eventually */
}
crq->rq = rq;
blk_start_request(rq);
if (rq_data_dir(rq) == WRITE) {
writing = 1;
pci_dir = PCI_DMA_TODEVICE;
} else {
pci_dir = PCI_DMA_FROMDEVICE;
}
/* get scatterlist from block layer */
sg = &crq->sg[0];
n_elem = blk_rq_map_sg(q, rq, sg);
if (n_elem <= 0) {
carm_end_rq(host, crq, -EIO);
return; /* request with no s/g entries? */
}
/* map scatterlist to PCI bus addresses */
n_elem = pci_map_sg(host->pdev, sg, n_elem, pci_dir);
if (n_elem <= 0) {
carm_end_rq(host, crq, -EIO);
return; /* request with no s/g entries? */
}
crq->n_elem = n_elem;
crq->port = port;
host->hw_sg_used += n_elem;
/*
* build read/write message
*/
VPRINTK("build msg\n");
msg = (struct carm_msg_rw *) carm_ref_msg(host, crq->tag);
if (writing) {
msg->type = CARM_MSG_WRITE;
crq->msg_type = CARM_MSG_WRITE;
} else {
msg->type = CARM_MSG_READ;
crq->msg_type = CARM_MSG_READ;
}
msg->id = port->port_no;
msg->sg_count = n_elem;
msg->sg_type = SGT_32BIT;
msg->handle = cpu_to_le32(TAG_ENCODE(crq->tag));
msg->lba = cpu_to_le32(blk_rq_pos(rq) & 0xffffffff);
tmp = (blk_rq_pos(rq) >> 16) >> 16;
msg->lba_high = cpu_to_le16( (u16) tmp );
msg->lba_count = cpu_to_le16(blk_rq_sectors(rq));
msg_size = sizeof(struct carm_msg_rw) - sizeof(msg->sg);
for (i = 0; i < n_elem; i++) {
struct carm_msg_sg *carm_sg = &msg->sg[i];
carm_sg->start = cpu_to_le32(sg_dma_address(&crq->sg[i]));
carm_sg->len = cpu_to_le32(sg_dma_len(&crq->sg[i]));
msg_size += sizeof(struct carm_msg_sg);
}
rc = carm_lookup_bucket(msg_size);
BUG_ON(rc < 0);
crq->msg_bucket = (u32) rc;
/*
* queue read/write message to hardware
*/
VPRINTK("send msg, tag == %u\n", crq->tag);
rc = carm_send_msg(host, crq);
if (rc) {
carm_put_request(host, crq);
blk_requeue_request(q, rq);
carm_push_q(host, q);
return; /* call us again later, eventually */
}
goto queue_one_request;
}
static void carm_handle_array_info(struct carm_host *host,
struct carm_request *crq, u8 *mem,
int error)
{
struct carm_port *port;
u8 *msg_data = mem + sizeof(struct carm_array_info);
struct carm_array_info *desc = (struct carm_array_info *) msg_data;
u64 lo, hi;
int cur_port;
size_t slen;
DPRINTK("ENTER\n");
carm_end_rq(host, crq, error);
if (error)
goto out;
if (le32_to_cpu(desc->array_status) & ARRAY_NO_EXIST)
goto out;
cur_port = host->cur_scan_dev;
/* should never occur */
if ((cur_port < 0) || (cur_port >= CARM_MAX_PORTS)) {
printk(KERN_ERR PFX "BUG: cur_scan_dev==%d, array_id==%d\n",
cur_port, (int) desc->array_id);
goto out;
}
port = &host->port[cur_port];
lo = (u64) le32_to_cpu(desc->size);
hi = (u64) le16_to_cpu(desc->size_hi);
port->capacity = lo | (hi << 32);
port->dev_geom_head = le16_to_cpu(desc->head);
port->dev_geom_sect = le16_to_cpu(desc->sect);
port->dev_geom_cyl = le16_to_cpu(desc->cyl);
host->dev_active |= (1 << cur_port);
strncpy(port->name, desc->name, sizeof(port->name));
port->name[sizeof(port->name) - 1] = 0;
slen = strlen(port->name);
while (slen && (port->name[slen - 1] == ' ')) {
port->name[slen - 1] = 0;
slen--;
}
printk(KERN_INFO DRV_NAME "(%s): port %u device %Lu sectors\n",
pci_name(host->pdev), port->port_no,
(unsigned long long) port->capacity);
printk(KERN_INFO DRV_NAME "(%s): port %u device \"%s\"\n",
pci_name(host->pdev), port->port_no, port->name);
out:
assert(host->state == HST_DEV_SCAN);
schedule_work(&host->fsm_task);
}