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path: root/drivers/block/aoe/aoeblk.c
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Diffstat (limited to 'drivers/block/aoe/aoeblk.c')
-rw-r--r--drivers/block/aoe/aoeblk.c450
1 files changed, 450 insertions, 0 deletions
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
new file mode 100644
index 000000000..128722cf6
--- /dev/null
+++ b/drivers/block/aoe/aoeblk.c
@@ -0,0 +1,450 @@
+/* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
+/*
+ * aoeblk.c
+ * block device routines
+ */
+
+#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;
+
+/* GPFS needs a larger value than the default. */
+static int aoe_maxsectors;
+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" : "");
+ /* I'd rather see nopen exported so we can ditch 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;
+}
+/* firmware version */
+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 block_device *bdev, fmode_t mode)
+{
+ struct aoedev *d = bdev->bd_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, fmode_t mode)
+{
+ 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 block_device *bdev, struct hd_geometry *geo)
+{
+ struct aoedev *d = bdev->bd_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, fmode_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;
+ }
+
+ /* udev calls scsi_id, which uses SG_IO, resulting in noise */
+ 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,
+};
+
+/* blk_mq_alloc_disk and add_disk can sleep */
+void
+aoeblk_gdalloc(void *vp)
+{
+ struct aoedev *d = vp;
+ struct gendisk *gd;
+ mempool_t *mp;
+ struct blk_mq_tag_set *set;
+ 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;
+ set->flags = BLK_MQ_F_SHOULD_MERGE;
+ 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, 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);
+ blk_queue_max_hw_sectors(gd->queue, BLK_DEF_MAX_SECTORS);
+ blk_queue_io_opt(gd->queue, SZ_2M);
+ d->bufpool = mp;
+ d->blkq = gd->queue;
+ d->gd = gd;
+ if (aoe_maxsectors)
+ blk_queue_max_hw_sectors(gd->queue, aoe_maxsectors);
+ gd->major = AOE_MAJOR;
+ gd->first_minor = d->sysminor;
+ gd->minors = AOE_PARTITIONS;
+ gd->fops = &aoe_bdops;
+ gd->private_data = d;
+ set_capacity(gd, 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);
+
+ 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;
+}
+