#include <linux/kernel.h>
#include <linux/hdreg.h>
#include <linux/blk-mq.h>
#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/slab.h>
#include <linux/ratelimit.h>
#include <linux/netdevice.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/moduleparam.h>
#include <linux/debugfs.h>
#include <scsi/sg.h>
#include "aoe.h"
static DEFINE_MUTEX(aoeblk_mutex);
static struct kmem_cache *buf_pool_cache;
static struct dentry *aoe_debugfs_dir;
static int aoe_maxsectors = 2560;
module_param(aoe_maxsectors, int, 0644);
MODULE_PARM_DESC(aoe_maxsectors,
"When nonzero, set the maximum number of sectors per I/O request");
static ssize_t aoedisk_show_state(struct device *dev,
struct device_attribute *attr, char *page)
{
struct gendisk *disk = dev_to_disk(dev);
struct aoedev *d = disk->private_data;
return sysfs_emit(page, "%s%s\n",
(d->flags & DEVFL_UP) ? "up" : "down",
(d->flags & DEVFL_KICKME) ? ",kickme" :
(d->nopen && !(d->flags & DEVFL_UP)) ? ",closewait" : "");
}
static ssize_t aoedisk_show_mac(struct device *dev,
struct device_attribute *attr, char *page)
{
struct gendisk *disk = dev_to_disk(dev);
struct aoedev *d = disk->private_data;
struct aoetgt *t = d->targets[0];
if (t == NULL)
return sysfs_emit(page, "none\n");
return sysfs_emit(page, "%pm\n", t->addr);
}
static ssize_t aoedisk_show_netif(struct device *dev,
struct device_attribute *attr, char *page)
{
struct gendisk *disk = dev_to_disk(dev);
struct aoedev *d = disk->private_data;
struct net_device *nds[8], **nd, **nnd, **ne;
struct aoetgt **t, **te;
struct aoeif *ifp, *e;
char *p;
memset(nds, 0, sizeof nds);
nd = nds;
ne = nd + ARRAY_SIZE(nds);
t = d->targets;
te = t + d->ntargets;
for (; t < te && *t; t++) {
ifp = (*t)->ifs;
e = ifp + NAOEIFS;
for (; ifp < e && ifp->nd; ifp++) {
for (nnd = nds; nnd < nd; nnd++)
if (*nnd == ifp->nd)
break;
if (nnd == nd && nd != ne)
*nd++ = ifp->nd;
}
}
ne = nd;
nd = nds;
if (*nd == NULL)
return sysfs_emit(page, "none\n");
for (p = page; nd < ne; nd++)
p += scnprintf(p, PAGE_SIZE - (p-page), "%s%s",
p == page ? "" : ",", (*nd)->name);
p += scnprintf(p, PAGE_SIZE - (p-page), "\n");
return p-page;
}
static ssize_t aoedisk_show_fwver(struct device *dev,
struct device_attribute *attr, char *page)
{
struct gendisk *disk = dev_to_disk(dev);
struct aoedev *d = disk->private_data;
return sysfs_emit(page, "0x%04x\n", (unsigned int) d->fw_ver);
}
static ssize_t aoedisk_show_payload(struct device *dev,
struct device_attribute *attr, char *page)
{
struct gendisk *disk = dev_to_disk(dev);
struct aoedev *d = disk->private_data;
return sysfs_emit(page, "%lu\n", d->maxbcnt);
}
static int aoe_debugfs_show(struct seq_file *s, void *ignored)
{
struct aoedev *d;
struct aoetgt **t, **te;
struct aoeif *ifp, *ife;
unsigned long flags;
char c;
d = s->private;
seq_printf(s, "rttavg: %d rttdev: %d\n",
d->rttavg >> RTTSCALE,
d->rttdev >> RTTDSCALE);
seq_printf(s, "nskbpool: %d\n", skb_queue_len(&d->skbpool));
seq_printf(s, "kicked: %ld\n", d->kicked);
seq_printf(s, "maxbcnt: %ld\n", d->maxbcnt);
seq_printf(s, "ref: %ld\n", d->ref);
spin_lock_irqsave(&d->lock, flags);
t = d->targets;
te = t + d->ntargets;
for (; t < te && *t; t++) {
c = '\t';
seq_printf(s, "falloc: %ld\n", (*t)->falloc);
seq_printf(s, "ffree: %p\n",
list_empty(&(*t)->ffree) ? NULL : (*t)->ffree.next);
seq_printf(s, "%pm:%d:%d:%d\n", (*t)->addr, (*t)->nout,
(*t)->maxout, (*t)->nframes);
seq_printf(s, "\tssthresh:%d\n", (*t)->ssthresh);
seq_printf(s, "\ttaint:%d\n", (*t)->taint);
seq_printf(s, "\tr:%d\n", (*t)->rpkts);
seq_printf(s, "\tw:%d\n", (*t)->wpkts);
ifp = (*t)->ifs;
ife = ifp + ARRAY_SIZE((*t)->ifs);
for (; ifp->nd && ifp < ife; ifp++) {
seq_printf(s, "%c%s", c, ifp->nd->name);
c = ',';
}
seq_puts(s, "\n");
}
spin_unlock_irqrestore(&d->lock, flags);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(aoe_debugfs);
static DEVICE_ATTR(state, 0444, aoedisk_show_state, NULL);
static DEVICE_ATTR(mac, 0444, aoedisk_show_mac, NULL);
static DEVICE_ATTR(netif, 0444, aoedisk_show_netif, NULL);
static struct device_attribute dev_attr_firmware_version = {
.attr = { .name = "firmware-version", .mode = 0444 },
.show = aoedisk_show_fwver,
};
static DEVICE_ATTR(payload, 0444, aoedisk_show_payload, NULL);
static struct attribute *aoe_attrs[] = {
&dev_attr_state.attr,
&dev_attr_mac.attr,
&dev_attr_netif.attr,
&dev_attr_firmware_version.attr,
&dev_attr_payload.attr,
NULL,
};
static const struct attribute_group aoe_attr_group = {
.attrs = aoe_attrs,
};
static const struct attribute_group *aoe_attr_groups[] = {
&aoe_attr_group,
NULL,
};
static void
aoedisk_add_debugfs(struct aoedev *d)
{
char *p;
if (aoe_debugfs_dir == NULL)
return;
p = strchr(d->gd->disk_name, '/');
if (p == NULL)
p = d->gd->disk_name;
else
p++;
BUG_ON(*p == '\0');
d->debugfs = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
&aoe_debugfs_fops);
}
void
aoedisk_rm_debugfs(struct aoedev *d)
{
debugfs_remove(d->debugfs);
d->debugfs = NULL;
}
static int
aoeblk_open(struct gendisk *disk, blk_mode_t mode)
{
struct aoedev *d = disk->private_data;
ulong flags;
if (!virt_addr_valid(d)) {
pr_crit("aoe: invalid device pointer in %s\n",
__func__);
WARN_ON(1);
return -ENODEV;
}
if (!(d->flags & DEVFL_UP) || d->flags & DEVFL_TKILL)
return -ENODEV;
mutex_lock(&aoeblk_mutex);
spin_lock_irqsave(&d->lock, flags);
if (d->flags & DEVFL_UP && !(d->flags & DEVFL_TKILL)) {
d->nopen++;
spin_unlock_irqrestore(&d->lock, flags);
mutex_unlock(&aoeblk_mutex);
return 0;
}
spin_unlock_irqrestore(&d->lock, flags);
mutex_unlock(&aoeblk_mutex);
return -ENODEV;
}
static void
aoeblk_release(struct gendisk *disk)
{
struct aoedev *d = disk->private_data;
ulong flags;
spin_lock_irqsave(&d->lock, flags);
if (--d->nopen == 0) {
spin_unlock_irqrestore(&d->lock, flags);
aoecmd_cfg(d->aoemajor, d->aoeminor);
return;
}
spin_unlock_irqrestore(&d->lock, flags);
}
static blk_status_t aoeblk_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
struct aoedev *d = hctx->queue->queuedata;
spin_lock_irq(&d->lock);
if ((d->flags & DEVFL_UP) == 0) {
pr_info_ratelimited("aoe: device %ld.%d is not up\n",
d->aoemajor, d->aoeminor);
spin_unlock_irq(&d->lock);
blk_mq_start_request(bd->rq);
return BLK_STS_IOERR;
}
list_add_tail(&bd->rq->queuelist, &d->rq_list);
aoecmd_work(d);
spin_unlock_irq(&d->lock);
return BLK_STS_OK;
}
static int
aoeblk_getgeo(struct gendisk *disk, struct hd_geometry *geo)
{
struct aoedev *d = disk->private_data;
if ((d->flags & DEVFL_UP) == 0) {
printk(KERN_ERR "aoe: disk not up\n");
return -ENODEV;
}
geo->cylinders = d->geo.cylinders;
geo->heads = d->geo.heads;
geo->sectors = d->geo.sectors;
return 0;
}
static int
aoeblk_ioctl(struct block_device *bdev, blk_mode_t mode, uint cmd, ulong arg)
{
struct aoedev *d;
if (!arg)
return -EINVAL;
d = bdev->bd_disk->private_data;
if ((d->flags & DEVFL_UP) == 0) {
pr_err("aoe: disk not up\n");
return -ENODEV;
}
if (cmd == HDIO_GET_IDENTITY) {
if (!copy_to_user((void __user *) arg, &d->ident,
sizeof(d->ident)))
return 0;
return -EFAULT;
}
if (cmd != SG_IO)
pr_info("aoe: unknown ioctl 0x%x\n", cmd);
return -ENOTTY;
}
static const struct block_device_operations aoe_bdops = {
.open = aoeblk_open,
.release = aoeblk_release,
.ioctl = aoeblk_ioctl,
.compat_ioctl = blkdev_compat_ptr_ioctl,
.getgeo = aoeblk_getgeo,
.owner = THIS_MODULE,
};
static const struct blk_mq_ops aoeblk_mq_ops = {
.queue_rq = aoeblk_queue_rq,
};
void
aoeblk_gdalloc(void *vp)
{
struct aoedev *d = vp;
struct gendisk *gd;
mempool_t *mp;
struct blk_mq_tag_set *set;
sector_t ssize;
struct queue_limits lim = {
.max_hw_sectors = aoe_maxsectors,
.io_opt = SZ_2M,
.features = BLK_FEAT_ROTATIONAL,
};
ulong flags;
int late = 0;
int err;
spin_lock_irqsave(&d->lock, flags);
if (d->flags & DEVFL_GDALLOC
&& !(d->flags & DEVFL_TKILL)
&& !(d->flags & DEVFL_GD_NOW))
d->flags |= DEVFL_GD_NOW;
else
late = 1;
spin_unlock_irqrestore(&d->lock, flags);
if (late)
return;
mp = mempool_create(MIN_BUFS, mempool_alloc_slab, mempool_free_slab,
buf_pool_cache);
if (mp == NULL) {
printk(KERN_ERR "aoe: cannot allocate bufpool for %ld.%d\n",
d->aoemajor, d->aoeminor);
goto err;
}
set = &d->tag_set;
set->ops = &aoeblk_mq_ops;
set->cmd_size = sizeof(struct aoe_req);
set->nr_hw_queues = 1;
set->queue_depth = 128;
set->numa_node = NUMA_NO_NODE;
err = blk_mq_alloc_tag_set(set);
if (err) {
pr_err("aoe: cannot allocate tag set for %ld.%d\n",
d->aoemajor, d->aoeminor);
goto err_mempool;
}
gd = blk_mq_alloc_disk(set, &lim, d);
if (IS_ERR(gd)) {
pr_err("aoe: cannot allocate block queue for %ld.%d\n",
d->aoemajor, d->aoeminor);
goto err_tagset;
}
spin_lock_irqsave(&d->lock, flags);
WARN_ON(!(d->flags & DEVFL_GD_NOW));
WARN_ON(!(d->flags & DEVFL_GDALLOC));
WARN_ON(d->flags & DEVFL_TKILL);
WARN_ON(d->gd);
WARN_ON(d->flags & DEVFL_UP);
d->bufpool = mp;
d->blkq = gd->queue;
d->gd = gd;
gd->major = AOE_MAJOR;
gd->first_minor = d->sysminor;
gd->minors = AOE_PARTITIONS;
gd->fops = &aoe_bdops;
gd->private_data = d;
ssize = d->ssize;
snprintf(gd->disk_name, sizeof gd->disk_name, "etherd/e%ld.%d",
d->aoemajor, d->aoeminor);
d->flags &= ~DEVFL_GDALLOC;
d->flags |= DEVFL_UP;
spin_unlock_irqrestore(&d->lock, flags);
set_capacity(gd, ssize);
err = device_add_disk(NULL, gd, aoe_attr_groups);
if (err)
goto out_disk_cleanup;
aoedisk_add_debugfs(d);
spin_lock_irqsave(&d->lock, flags);
WARN_ON(!(d->flags & DEVFL_GD_NOW));
d->flags &= ~DEVFL_GD_NOW;
spin_unlock_irqrestore(&d->lock, flags);
return;
out_disk_cleanup:
put_disk(gd);
err_tagset:
blk_mq_free_tag_set(set);
err_mempool:
mempool_destroy(mp);
err:
spin_lock_irqsave(&d->lock, flags);
d->flags &= ~DEVFL_GD_NOW;
queue_work(aoe_wq, &d->work);
spin_unlock_irqrestore(&d->lock, flags);
}
void
aoeblk_exit(void)
{
debugfs_remove_recursive(aoe_debugfs_dir);
aoe_debugfs_dir = NULL;
kmem_cache_destroy(buf_pool_cache);
}
int __init
aoeblk_init(void)
{
buf_pool_cache = kmem_cache_create("aoe_bufs",
sizeof(struct buf),
0, 0, NULL);
if (buf_pool_cache == NULL)
return -ENOMEM;
aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
return 0;
}
