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linux/drivers/block/sx8.c
Christoph Hellwig 2a842acab1 block: introduce new block status code type 
Currently we use nornal Linux errno values in the block layer, and while
we accept any error a few have overloaded magic meanings.  This patch
instead introduces a new  blk_status_t value that holds block layer specific
status codes and explicitly explains their meaning.  Helpers to convert from
and to the previous special meanings are provided for now, but I suspect
we want to get rid of them in the long run - those drivers that have a
errno input (e.g. networking) usually get errnos that don't know about
the special block layer overloads, and similarly returning them to userspace
will usually return somethings that strictly speaking isn't correct
for file system operations, but that's left as an exercise for later.

For now the set of errors is a very limited set that closely corresponds
to the previous overloaded errno values, but there is some low hanging
fruite to improve it.

blk_status_t (ab)uses the sparse __bitwise annotations to allow for sparse
typechecking, so that we can easily catch places passing the wrong values.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
2017-06-09 09:27:32 -06:00

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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 <jgarzik@pobox.com>
*
* 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/ktime.h>
#include <linux/hdreg.h>
#include <linux/dma-mapping.h>
#include <linux/completion.h>
#include <linux/scatterlist.h>
#include <asm/io.h>
#include <linux/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, REQ_OP_DRV_OUT, GFP_KERNEL);
if (IS_ERR(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->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->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 carm_msg_sync_time *st = mem;
time64_t tv = ktime_get_real_seconds();
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);
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,
blk_status_t 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,
blk_status_t 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, BLK_STS_IOERR);
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, BLK_STS_IOERR);
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,
blk_status_t 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);
}
static void carm_handle_scan_chan(struct carm_host *host,
struct carm_request *crq, u8 *mem,
blk_status_t error)
{
u8 *msg_data = mem + IOC_SCAN_CHAN_OFFSET;
unsigned int i, dev_count = 0;
int new_state = HST_DEV_SCAN_START;
DPRINTK("ENTER\n");
carm_end_rq(host, crq, error);
if (error) {
new_state = HST_ERROR;
goto out;
}
/* TODO: scan and support non-disk devices */
for (i = 0; i < 8; i++)
if (msg_data[i] == 0) { /* direct-access device (disk) */
host->dev_present |= (1 << i);
dev_count++;
}
printk(KERN_INFO DRV_NAME "(%s): found %u interesting devices\n",
pci_name(host->pdev), dev_count);
out:
assert(host->state == HST_PORT_SCAN);
host->state = new_state;
schedule_work(&host->fsm_task);
}
static void carm_handle_generic(struct carm_host *host,
struct carm_request *crq, blk_status_t error,
int cur_state, int next_state)
{
DPRINTK("ENTER\n");
carm_end_rq(host, crq, error);
assert(host->state == cur_state);
if (error)
host->state = HST_ERROR;
else
host->state = next_state;
schedule_work(&host->fsm_task);
}
static inline void carm_handle_rw(struct carm_host *host,
struct carm_request *crq, blk_status_t error)
{
int pci_dir;
VPRINTK("ENTER\n");
if (rq_data_dir(crq->rq) == WRITE)
pci_dir = PCI_DMA_TODEVICE;
else
pci_dir = PCI_DMA_FROMDEVICE;
pci_unmap_sg(host->pdev, &crq->sg[0], crq->n_elem, pci_dir);
carm_end_rq(host, crq, error);
}
static inline void carm_handle_resp(struct carm_host *host,
__le32 ret_handle_le, u32 status)
{
u32 handle = le32_to_cpu(ret_handle_le);
unsigned int msg_idx;
struct carm_request *crq;
blk_status_t error = (status == RMSG_OK) ? 0 : BLK_STS_IOERR;
u8 *mem;
VPRINTK("ENTER, handle == 0x%x\n", handle);
if (unlikely(!TAG_VALID(handle))) {
printk(KERN_ERR DRV_NAME "(%s): BUG: invalid tag 0x%x\n",
pci_name(host->pdev), handle);
return;
}
msg_idx = TAG_DECODE(handle);
VPRINTK("tag == %u\n", msg_idx);
crq = &host->req[msg_idx];
/* fast path */
if (likely(crq->msg_type == CARM_MSG_READ ||
crq->msg_type == CARM_MSG_WRITE)) {
carm_handle_rw(host, crq, error);
return;
}
mem = carm_ref_msg(host, msg_idx);
switch (crq->msg_type) {
case CARM_MSG_IOCTL: {
switch (crq->msg_subtype) {
case CARM_IOC_SCAN_CHAN:
carm_handle_scan_chan(host, crq, mem, error);
break;
default:
/* unknown / invalid response */
goto err_out;
}
break;
}
case CARM_MSG_MISC: {
switch (crq->msg_subtype) {
case MISC_ALLOC_MEM:
carm_handle_generic(host, crq, error,
HST_ALLOC_BUF, HST_SYNC_TIME);
break;
case MISC_SET_TIME:
carm_handle_generic(host, crq, error,
HST_SYNC_TIME, HST_GET_FW_VER);
break;
case MISC_GET_FW_VER: {
struct carm_fw_ver *ver = (struct carm_fw_ver *)
(mem + sizeof(struct carm_msg_get_fw_ver));
if (!error) {
host->fw_ver = le32_to_cpu(ver->version);
host->flags |= (ver->features & FL_FW_VER_MASK);
}
carm_handle_generic(host, crq, error,
HST_GET_FW_VER, HST_PORT_SCAN);
break;
}
default:
/* unknown / invalid response */
goto err_out;
}
break;
}
case CARM_MSG_ARRAY: {
switch (crq->msg_subtype) {
case CARM_ARRAY_INFO:
carm_handle_array_info(host, crq, mem, error);
break;
default:
/* unknown / invalid response */
goto err_out;
}
break;
}
default:
/* unknown / invalid response */
goto err_out;
}
return;
err_out:
printk(KERN_WARNING DRV_NAME "(%s): BUG: unhandled message type %d/%d\n",
pci_name(host->pdev), crq->msg_type, crq->msg_subtype);
carm_end_rq(host, crq, BLK_STS_IOERR);
}
static inline void carm_handle_responses(struct carm_host *host)
{
void __iomem *mmio = host->mmio;
struct carm_response *resp = (struct carm_response *) host->shm;
unsigned int work = 0;
unsigned int idx = host->resp_idx % RMSG_Q_LEN;
while (1) {
u32 status = le32_to_cpu(resp[idx].status);
if (status == 0xffffffff) {
VPRINTK("ending response on index %u\n", idx);
writel(idx << 3, mmio + CARM_RESP_IDX);
break;
}
/* response to a message we sent */
else if ((status & (1 << 31)) == 0) {
VPRINTK("handling msg response on index %u\n", idx);
carm_handle_resp(host, resp[idx].ret_handle, status);
resp[idx].status = cpu_to_le32(0xffffffff);
}
/* asynchronous events the hardware throws our way */
else if ((status & 0xff000000) == (1 << 31)) {
u8 *evt_type_ptr = (u8 *) &resp[idx];
u8 evt_type = *evt_type_ptr;
printk(KERN_WARNING DRV_NAME "(%s): unhandled event type %d\n",
pci_name(host->pdev), (int) evt_type);
resp[idx].status = cpu_to_le32(0xffffffff);
}
idx = NEXT_RESP(idx);
work++;
}
VPRINTK("EXIT, work==%u\n", work);
host->resp_idx += work;
}
static irqreturn_t carm_interrupt(int irq, void *__host)
{
struct carm_host *host = __host;
void __iomem *mmio;
u32 mask;
int handled = 0;
unsigned long flags;
if (!host) {
VPRINTK("no host\n");
return IRQ_NONE;
}
spin_lock_irqsave(&host->lock, flags);
mmio = host->mmio;
/* reading should also clear interrupts */
mask = readl(mmio + CARM_INT_STAT);
if (mask == 0 || mask == 0xffffffff) {
VPRINTK("no work, mask == 0x%x\n", mask);
goto out;
}
if (mask & INT_ACK_MASK)
writel(mask, mmio + CARM_INT_STAT);
if (unlikely(host->state == HST_INVALID)) {
VPRINTK("not initialized yet, mask = 0x%x\n", mask);
goto out;
}
if (mask & CARM_HAVE_RESP) {
handled = 1;
carm_handle_responses(host);
}
out:
spin_unlock_irqrestore(&host->lock, flags);
VPRINTK("EXIT\n");
return IRQ_RETVAL(handled);
}
static void carm_fsm_task (struct work_struct *work)
{
struct carm_host *host =
container_of(work, struct carm_host, fsm_task);
unsigned long flags;
unsigned int state;
int rc, i, next_dev;
int reschedule = 0;
int new_state = HST_INVALID;
spin_lock_irqsave(&host->lock, flags);
state = host->state;
spin_unlock_irqrestore(&host->lock, flags);
DPRINTK("ENTER, state == %s\n", state_name[state]);
switch (state) {
case HST_PROBE_START:
new_state = HST_ALLOC_BUF;
reschedule = 1;
break;
case HST_ALLOC_BUF:
rc = carm_send_special(host, carm_fill_alloc_buf);
if (rc) {
new_state = HST_ERROR;
reschedule = 1;
}
break;
case HST_SYNC_TIME:
rc = carm_send_special(host, carm_fill_sync_time);
if (rc) {
new_state = HST_ERROR;
reschedule = 1;
}
break;
case HST_GET_FW_VER:
rc = carm_send_special(host, carm_fill_get_fw_ver);
if (rc) {
new_state = HST_ERROR;
reschedule = 1;
}
break;
case HST_PORT_SCAN:
rc = carm_send_special(host, carm_fill_scan_channels);
if (rc) {
new_state = HST_ERROR;
reschedule = 1;
}
break;
case HST_DEV_SCAN_START:
host->cur_scan_dev = -1;
new_state = HST_DEV_SCAN;
reschedule = 1;
break;
case HST_DEV_SCAN:
next_dev = -1;
for (i = host->cur_scan_dev + 1; i < CARM_MAX_PORTS; i++)
if (host->dev_present & (1 << i)) {
next_dev = i;
break;
}
if (next_dev >= 0) {
host->cur_scan_dev = next_dev;
rc = carm_array_info(host, next_dev);
if (rc) {
new_state = HST_ERROR;
reschedule = 1;
}
} else {
new_state = HST_DEV_ACTIVATE;
reschedule = 1;
}
break;
case HST_DEV_ACTIVATE: {
int activated = 0;
for (i = 0; i < CARM_MAX_PORTS; i++)
if (host->dev_active & (1 << i)) {
struct carm_port *port = &host->port[i];
struct gendisk *disk = port->disk;
set_capacity(disk, port->capacity);
add_disk(disk);
activated++;
}
printk(KERN_INFO DRV_NAME "(%s): %d ports activated\n",
pci_name(host->pdev), activated);
new_state = HST_PROBE_FINISHED;
reschedule = 1;
break;
}
case HST_PROBE_FINISHED:
complete(&host->probe_comp);
break;
case HST_ERROR:
/* FIXME: TODO */
break;
default:
/* should never occur */
printk(KERN_ERR PFX "BUG: unknown state %d\n", state);
assert(0);
break;
}
if (new_state != HST_INVALID) {
spin_lock_irqsave(&host->lock, flags);
host->state = new_state;
spin_unlock_irqrestore(&host->lock, flags);
}
if (reschedule)
schedule_work(&host->fsm_task);
}
static int carm_init_wait(void __iomem *mmio, u32 bits, unsigned int test_bit)
{
unsigned int i;
for (i = 0; i < 50000; i++) {
u32 tmp = readl(mmio + CARM_LMUC);
udelay(100);
if (test_bit) {
if ((tmp & bits) == bits)
return 0;
} else {
if ((tmp & bits) == 0)
return 0;
}
cond_resched();
}
printk(KERN_ERR PFX "carm_init_wait timeout, bits == 0x%x, test_bit == %s\n",
bits, test_bit ? "yes" : "no");
return -EBUSY;
}
static void carm_init_responses(struct carm_host *host)
{
void __iomem *mmio = host->mmio;
unsigned int i;
struct carm_response *resp = (struct carm_response *) host->shm;
for (i = 0; i < RMSG_Q_LEN; i++)
resp[i].status = cpu_to_le32(0xffffffff);
writel(0, mmio + CARM_RESP_IDX);
}
static int carm_init_host(struct carm_host *host)
{
void __iomem *mmio = host->mmio;
u32 tmp;
u8 tmp8;
int rc;
DPRINTK("ENTER\n");
writel(0, mmio + CARM_INT_MASK);
tmp8 = readb(mmio + CARM_INITC);
if (tmp8 & 0x01) {
tmp8 &= ~0x01;
writeb(tmp8, mmio + CARM_INITC);
readb(mmio + CARM_INITC); /* flush */
DPRINTK("snooze...\n");
msleep(5000);
}
tmp = readl(mmio + CARM_HMUC);
if (tmp & CARM_CME) {
DPRINTK("CME bit present, waiting\n");
rc = carm_init_wait(mmio, CARM_CME, 1);
if (rc) {
DPRINTK("EXIT, carm_init_wait 1 failed\n");
return rc;
}
}
if (tmp & CARM_RME) {
DPRINTK("RME bit present, waiting\n");
rc = carm_init_wait(mmio, CARM_RME, 1);
if (rc) {
DPRINTK("EXIT, carm_init_wait 2 failed\n");
return rc;
}
}
tmp &= ~(CARM_RME | CARM_CME);
writel(tmp, mmio + CARM_HMUC);
readl(mmio + CARM_HMUC); /* flush */
rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 0);
if (rc) {
DPRINTK("EXIT, carm_init_wait 3 failed\n");
return rc;
}
carm_init_buckets(mmio);
writel(host->shm_dma & 0xffffffff, mmio + RBUF_ADDR_LO);
writel((host->shm_dma >> 16) >> 16, mmio + RBUF_ADDR_HI);
writel(RBUF_LEN, mmio + RBUF_BYTE_SZ);
tmp = readl(mmio + CARM_HMUC);
tmp |= (CARM_RME | CARM_CME | CARM_WZBC);
writel(tmp, mmio + CARM_HMUC);
readl(mmio + CARM_HMUC); /* flush */
rc = carm_init_wait(mmio, CARM_RME | CARM_CME, 1);
if (rc) {
DPRINTK("EXIT, carm_init_wait 4 failed\n");
return rc;
}
writel(0, mmio + CARM_HMPHA);
writel(INT_DEF_MASK, mmio + CARM_INT_MASK);
carm_init_responses(host);
/* start initialization, probing state machine */
spin_lock_irq(&host->lock);
assert(host->state == HST_INVALID);
host->state = HST_PROBE_START;
spin_unlock_irq(&host->lock);
schedule_work(&host->fsm_task);
DPRINTK("EXIT\n");
return 0;
}
static int carm_init_disks(struct carm_host *host)
{
unsigned int i;
int rc = 0;
for (i = 0; i < CARM_MAX_PORTS; i++) {
struct gendisk *disk;
struct request_queue *q;
struct carm_port *port;
port = &host->port[i];
port->host = host;
port->port_no = i;
disk = alloc_disk(CARM_MINORS_PER_MAJOR);
if (!disk) {
rc = -ENOMEM;
break;
}
port->disk = disk;
sprintf(disk->disk_name, DRV_NAME "/%u",
(unsigned int) (host->id * CARM_MAX_PORTS) + i);
disk->major = host->major;
disk->first_minor = i * CARM_MINORS_PER_MAJOR;
disk->fops = &carm_bd_ops;
disk->private_data = port;
q = blk_init_queue(carm_rq_fn, &host->lock);
if (!q) {
rc = -ENOMEM;
break;
}
disk->queue = q;
blk_queue_max_segments(q, CARM_MAX_REQ_SG);
blk_queue_segment_boundary(q, CARM_SG_BOUNDARY);
q->queuedata = port;
}
return rc;
}
static void carm_free_disks(struct carm_host *host)
{
unsigned int i;
for (i = 0; i < CARM_MAX_PORTS; i++) {
struct gendisk *disk = host->port[i].disk;
if (disk) {
struct request_queue *q = disk->queue;
if (disk->flags & GENHD_FL_UP)
del_gendisk(disk);
if (q)
blk_cleanup_queue(q);
put_disk(disk);
}
}
}
static int carm_init_shm(struct carm_host *host)
{
host->shm = pci_alloc_consistent(host->pdev, CARM_SHM_SIZE,
&host->shm_dma);
if (!host->shm)
return -ENOMEM;
host->msg_base = host->shm + RBUF_LEN;
host->msg_dma = host->shm_dma + RBUF_LEN;
memset(host->shm, 0xff, RBUF_LEN);
memset(host->msg_base, 0, PDC_SHM_SIZE - RBUF_LEN);
return 0;
}
static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct carm_host *host;
unsigned int pci_dac;
int rc;
struct request_queue *q;
unsigned int i;
printk_once(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
rc = pci_enable_device(pdev);
if (rc)
return rc;
rc = pci_request_regions(pdev, DRV_NAME);
if (rc)
goto err_out;
#ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (!rc) {
rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
if (rc) {
printk(KERN_ERR DRV_NAME "(%s): consistent DMA mask failure\n",
pci_name(pdev));
goto err_out_regions;
}
pci_dac = 1;
} else {
#endif
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc) {
printk(KERN_ERR DRV_NAME "(%s): DMA mask failure\n",
pci_name(pdev));
goto err_out_regions;
}
pci_dac = 0;
#ifdef IF_64BIT_DMA_IS_POSSIBLE /* grrrr... */
}
#endif
host = kzalloc(sizeof(*host), GFP_KERNEL);
if (!host) {
printk(KERN_ERR DRV_NAME "(%s): memory alloc failure\n",
pci_name(pdev));
rc = -ENOMEM;
goto err_out_regions;
}
host->pdev = pdev;
host->flags = pci_dac ? FL_DAC : 0;
spin_lock_init(&host->lock);
INIT_WORK(&host->fsm_task, carm_fsm_task);
init_completion(&host->probe_comp);
for (i = 0; i < ARRAY_SIZE(host->req); i++)
host->req[i].tag = i;
host->mmio = ioremap(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
if (!host->mmio) {
printk(KERN_ERR DRV_NAME "(%s): MMIO alloc failure\n",
pci_name(pdev));
rc = -ENOMEM;
goto err_out_kfree;
}
rc = carm_init_shm(host);
if (rc) {
printk(KERN_ERR DRV_NAME "(%s): DMA SHM alloc failure\n",
pci_name(pdev));
goto err_out_iounmap;
}
q = blk_init_queue(carm_oob_rq_fn, &host->lock);
if (!q) {
printk(KERN_ERR DRV_NAME "(%s): OOB queue alloc failure\n",
pci_name(pdev));
rc = -ENOMEM;
goto err_out_pci_free;
}
host->oob_q = q;
q->queuedata = host;
/*
* Figure out which major to use: 160, 161, or dynamic
*/
if (!test_and_set_bit(0, &carm_major_alloc))
host->major = 160;
else if (!test_and_set_bit(1, &carm_major_alloc))
host->major = 161;
else
host->flags |= FL_DYN_MAJOR;
host->id = carm_host_id;
sprintf(host->name, DRV_NAME "%d", carm_host_id);
rc = register_blkdev(host->major, host->name);
if (rc < 0)
goto err_out_free_majors;
if (host->flags & FL_DYN_MAJOR)
host->major = rc;
rc = carm_init_disks(host);
if (rc)
goto err_out_blkdev_disks;
pci_set_master(pdev);
rc = request_irq(pdev->irq, carm_interrupt, IRQF_SHARED, DRV_NAME, host);
if (rc) {
printk(KERN_ERR DRV_NAME "(%s): irq alloc failure\n",
pci_name(pdev));
goto err_out_blkdev_disks;
}
rc = carm_init_host(host);
if (rc)
goto err_out_free_irq;
DPRINTK("waiting for probe_comp\n");
wait_for_completion(&host->probe_comp);
printk(KERN_INFO "%s: pci %s, ports %d, io %llx, irq %u, major %d\n",
host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
(unsigned long long)pci_resource_start(pdev, 0),
pdev->irq, host->major);
carm_host_id++;
pci_set_drvdata(pdev, host);
return 0;
err_out_free_irq:
free_irq(pdev->irq, host);
err_out_blkdev_disks:
carm_free_disks(host);
unregister_blkdev(host->major, host->name);
err_out_free_majors:
if (host->major == 160)
clear_bit(0, &carm_major_alloc);
else if (host->major == 161)
clear_bit(1, &carm_major_alloc);
blk_cleanup_queue(host->oob_q);
err_out_pci_free:
pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
err_out_iounmap:
iounmap(host->mmio);
err_out_kfree:
kfree(host);
err_out_regions:
pci_release_regions(pdev);
err_out:
pci_disable_device(pdev);
return rc;
}
static void carm_remove_one (struct pci_dev *pdev)
{
struct carm_host *host = pci_get_drvdata(pdev);
if (!host) {
printk(KERN_ERR PFX "BUG: no host data for PCI(%s)\n",
pci_name(pdev));
return;
}
free_irq(pdev->irq, host);
carm_free_disks(host);
unregister_blkdev(host->major, host->name);
if (host->major == 160)
clear_bit(0, &carm_major_alloc);
else if (host->major == 161)
clear_bit(1, &carm_major_alloc);
blk_cleanup_queue(host->oob_q);
pci_free_consistent(pdev, CARM_SHM_SIZE, host->shm, host->shm_dma);
iounmap(host->mmio);
kfree(host);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
module_pci_driver(carm_driver);
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