mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:56:48 +07:00
ca47bbd93c
Signed-off-by: Ed Cashin <ecashin@coraid.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
529 lines
11 KiB
C
529 lines
11 KiB
C
/* Copyright (c) 2013 Coraid, Inc. See COPYING for GPL terms. */
|
|
/*
|
|
* aoedev.c
|
|
* AoE device utility functions; maintains device list.
|
|
*/
|
|
|
|
#include <linux/hdreg.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/bitmap.h>
|
|
#include <linux/kdev_t.h>
|
|
#include <linux/moduleparam.h>
|
|
#include "aoe.h"
|
|
|
|
static void dummy_timer(ulong);
|
|
static void freetgt(struct aoedev *d, struct aoetgt *t);
|
|
static void skbpoolfree(struct aoedev *d);
|
|
|
|
static int aoe_dyndevs = 1;
|
|
module_param(aoe_dyndevs, int, 0644);
|
|
MODULE_PARM_DESC(aoe_dyndevs, "Use dynamic minor numbers for devices.");
|
|
|
|
static struct aoedev *devlist;
|
|
static DEFINE_SPINLOCK(devlist_lock);
|
|
|
|
/* Because some systems will have one, many, or no
|
|
* - partitions,
|
|
* - slots per shelf,
|
|
* - or shelves,
|
|
* we need some flexibility in the way the minor numbers
|
|
* are allocated. So they are dynamic.
|
|
*/
|
|
#define N_DEVS ((1U<<MINORBITS)/AOE_PARTITIONS)
|
|
|
|
static DEFINE_SPINLOCK(used_minors_lock);
|
|
static DECLARE_BITMAP(used_minors, N_DEVS);
|
|
|
|
static int
|
|
minor_get_dyn(ulong *sysminor)
|
|
{
|
|
ulong flags;
|
|
ulong n;
|
|
int error = 0;
|
|
|
|
spin_lock_irqsave(&used_minors_lock, flags);
|
|
n = find_first_zero_bit(used_minors, N_DEVS);
|
|
if (n < N_DEVS)
|
|
set_bit(n, used_minors);
|
|
else
|
|
error = -1;
|
|
spin_unlock_irqrestore(&used_minors_lock, flags);
|
|
|
|
*sysminor = n * AOE_PARTITIONS;
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
minor_get_static(ulong *sysminor, ulong aoemaj, int aoemin)
|
|
{
|
|
ulong flags;
|
|
ulong n;
|
|
int error = 0;
|
|
enum {
|
|
/* for backwards compatibility when !aoe_dyndevs,
|
|
* a static number of supported slots per shelf */
|
|
NPERSHELF = 16,
|
|
};
|
|
|
|
if (aoemin >= NPERSHELF) {
|
|
pr_err("aoe: %s %d slots per shelf\n",
|
|
"static minor device numbers support only",
|
|
NPERSHELF);
|
|
error = -1;
|
|
goto out;
|
|
}
|
|
|
|
n = aoemaj * NPERSHELF + aoemin;
|
|
if (n >= N_DEVS) {
|
|
pr_err("aoe: %s with e%ld.%d\n",
|
|
"cannot use static minor device numbers",
|
|
aoemaj, aoemin);
|
|
error = -1;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock_irqsave(&used_minors_lock, flags);
|
|
if (test_bit(n, used_minors)) {
|
|
pr_err("aoe: %s %lu\n",
|
|
"existing device already has static minor number",
|
|
n);
|
|
error = -1;
|
|
} else
|
|
set_bit(n, used_minors);
|
|
spin_unlock_irqrestore(&used_minors_lock, flags);
|
|
*sysminor = n * AOE_PARTITIONS;
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
minor_get(ulong *sysminor, ulong aoemaj, int aoemin)
|
|
{
|
|
if (aoe_dyndevs)
|
|
return minor_get_dyn(sysminor);
|
|
else
|
|
return minor_get_static(sysminor, aoemaj, aoemin);
|
|
}
|
|
|
|
static void
|
|
minor_free(ulong minor)
|
|
{
|
|
ulong flags;
|
|
|
|
minor /= AOE_PARTITIONS;
|
|
BUG_ON(minor >= N_DEVS);
|
|
|
|
spin_lock_irqsave(&used_minors_lock, flags);
|
|
BUG_ON(!test_bit(minor, used_minors));
|
|
clear_bit(minor, used_minors);
|
|
spin_unlock_irqrestore(&used_minors_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Users who grab a pointer to the device with aoedev_by_aoeaddr
|
|
* automatically get a reference count and must be responsible
|
|
* for performing a aoedev_put. With the addition of async
|
|
* kthread processing I'm no longer confident that we can
|
|
* guarantee consistency in the face of device flushes.
|
|
*
|
|
* For the time being, we only bother to add extra references for
|
|
* frames sitting on the iocq. When the kthreads finish processing
|
|
* these frames, they will aoedev_put the device.
|
|
*/
|
|
|
|
void
|
|
aoedev_put(struct aoedev *d)
|
|
{
|
|
ulong flags;
|
|
|
|
spin_lock_irqsave(&devlist_lock, flags);
|
|
d->ref--;
|
|
spin_unlock_irqrestore(&devlist_lock, flags);
|
|
}
|
|
|
|
static void
|
|
dummy_timer(ulong vp)
|
|
{
|
|
struct aoedev *d;
|
|
|
|
d = (struct aoedev *)vp;
|
|
if (d->flags & DEVFL_TKILL)
|
|
return;
|
|
d->timer.expires = jiffies + HZ;
|
|
add_timer(&d->timer);
|
|
}
|
|
|
|
static void
|
|
aoe_failip(struct aoedev *d)
|
|
{
|
|
struct request *rq;
|
|
struct bio *bio;
|
|
unsigned long n;
|
|
|
|
aoe_failbuf(d, d->ip.buf);
|
|
|
|
rq = d->ip.rq;
|
|
if (rq == NULL)
|
|
return;
|
|
while ((bio = d->ip.nxbio)) {
|
|
clear_bit(BIO_UPTODATE, &bio->bi_flags);
|
|
d->ip.nxbio = bio->bi_next;
|
|
n = (unsigned long) rq->special;
|
|
rq->special = (void *) --n;
|
|
}
|
|
if ((unsigned long) rq->special == 0)
|
|
aoe_end_request(d, rq, 0);
|
|
}
|
|
|
|
static void
|
|
downdev_frame(struct list_head *pos)
|
|
{
|
|
struct frame *f;
|
|
|
|
f = list_entry(pos, struct frame, head);
|
|
list_del(pos);
|
|
if (f->buf) {
|
|
f->buf->nframesout--;
|
|
aoe_failbuf(f->t->d, f->buf);
|
|
}
|
|
aoe_freetframe(f);
|
|
}
|
|
|
|
void
|
|
aoedev_downdev(struct aoedev *d)
|
|
{
|
|
struct aoetgt *t, **tt, **te;
|
|
struct list_head *head, *pos, *nx;
|
|
struct request *rq;
|
|
int i;
|
|
|
|
d->flags &= ~DEVFL_UP;
|
|
|
|
/* clean out active and to-be-retransmitted buffers */
|
|
for (i = 0; i < NFACTIVE; i++) {
|
|
head = &d->factive[i];
|
|
list_for_each_safe(pos, nx, head)
|
|
downdev_frame(pos);
|
|
}
|
|
head = &d->rexmitq;
|
|
list_for_each_safe(pos, nx, head)
|
|
downdev_frame(pos);
|
|
|
|
/* reset window dressings */
|
|
tt = d->targets;
|
|
te = tt + d->ntargets;
|
|
for (; tt < te && (t = *tt); tt++) {
|
|
aoecmd_wreset(t);
|
|
t->nout = 0;
|
|
}
|
|
|
|
/* clean out the in-process request (if any) */
|
|
aoe_failip(d);
|
|
|
|
/* fast fail all pending I/O */
|
|
if (d->blkq) {
|
|
while ((rq = blk_peek_request(d->blkq))) {
|
|
blk_start_request(rq);
|
|
aoe_end_request(d, rq, 1);
|
|
}
|
|
}
|
|
|
|
if (d->gd)
|
|
set_capacity(d->gd, 0);
|
|
}
|
|
|
|
/* return whether the user asked for this particular
|
|
* device to be flushed
|
|
*/
|
|
static int
|
|
user_req(char *s, size_t slen, struct aoedev *d)
|
|
{
|
|
char *p;
|
|
size_t lim;
|
|
|
|
if (!d->gd)
|
|
return 0;
|
|
p = strrchr(d->gd->disk_name, '/');
|
|
if (!p)
|
|
p = d->gd->disk_name;
|
|
else
|
|
p += 1;
|
|
lim = sizeof(d->gd->disk_name);
|
|
lim -= p - d->gd->disk_name;
|
|
if (slen < lim)
|
|
lim = slen;
|
|
|
|
return !strncmp(s, p, lim);
|
|
}
|
|
|
|
static void
|
|
freedev(struct aoedev *d)
|
|
{
|
|
struct aoetgt **t, **e;
|
|
int freeing = 0;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&d->lock, flags);
|
|
if (d->flags & DEVFL_TKILL
|
|
&& !(d->flags & DEVFL_FREEING)) {
|
|
d->flags |= DEVFL_FREEING;
|
|
freeing = 1;
|
|
}
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
if (!freeing)
|
|
return;
|
|
|
|
del_timer_sync(&d->timer);
|
|
if (d->gd) {
|
|
aoedisk_rm_sysfs(d);
|
|
del_gendisk(d->gd);
|
|
put_disk(d->gd);
|
|
blk_cleanup_queue(d->blkq);
|
|
}
|
|
t = d->targets;
|
|
e = t + d->ntargets;
|
|
for (; t < e && *t; t++)
|
|
freetgt(d, *t);
|
|
if (d->bufpool)
|
|
mempool_destroy(d->bufpool);
|
|
skbpoolfree(d);
|
|
minor_free(d->sysminor);
|
|
|
|
spin_lock_irqsave(&d->lock, flags);
|
|
d->flags |= DEVFL_FREED;
|
|
spin_unlock_irqrestore(&d->lock, flags);
|
|
}
|
|
|
|
enum flush_parms {
|
|
NOT_EXITING = 0,
|
|
EXITING = 1,
|
|
};
|
|
|
|
static int
|
|
flush(const char __user *str, size_t cnt, int exiting)
|
|
{
|
|
ulong flags;
|
|
struct aoedev *d, **dd;
|
|
char buf[16];
|
|
int all = 0;
|
|
int specified = 0; /* flush a specific device */
|
|
unsigned int skipflags;
|
|
|
|
skipflags = DEVFL_GDALLOC | DEVFL_NEWSIZE | DEVFL_TKILL;
|
|
|
|
if (!exiting && cnt >= 3) {
|
|
if (cnt > sizeof buf)
|
|
cnt = sizeof buf;
|
|
if (copy_from_user(buf, str, cnt))
|
|
return -EFAULT;
|
|
all = !strncmp(buf, "all", 3);
|
|
if (!all)
|
|
specified = 1;
|
|
}
|
|
|
|
flush_scheduled_work();
|
|
/* pass one: without sleeping, do aoedev_downdev */
|
|
spin_lock_irqsave(&devlist_lock, flags);
|
|
for (d = devlist; d; d = d->next) {
|
|
spin_lock(&d->lock);
|
|
if (exiting) {
|
|
/* unconditionally take each device down */
|
|
} else if (specified) {
|
|
if (!user_req(buf, cnt, d))
|
|
goto cont;
|
|
} else if ((!all && (d->flags & DEVFL_UP))
|
|
|| d->flags & skipflags
|
|
|| d->nopen
|
|
|| d->ref)
|
|
goto cont;
|
|
|
|
aoedev_downdev(d);
|
|
d->flags |= DEVFL_TKILL;
|
|
cont:
|
|
spin_unlock(&d->lock);
|
|
}
|
|
spin_unlock_irqrestore(&devlist_lock, flags);
|
|
|
|
/* pass two: call freedev, which might sleep,
|
|
* for aoedevs marked with DEVFL_TKILL
|
|
*/
|
|
restart:
|
|
spin_lock_irqsave(&devlist_lock, flags);
|
|
for (d = devlist; d; d = d->next) {
|
|
spin_lock(&d->lock);
|
|
if (d->flags & DEVFL_TKILL
|
|
&& !(d->flags & DEVFL_FREEING)) {
|
|
spin_unlock(&d->lock);
|
|
spin_unlock_irqrestore(&devlist_lock, flags);
|
|
freedev(d);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&d->lock);
|
|
}
|
|
|
|
/* pass three: remove aoedevs marked with DEVFL_FREED */
|
|
for (dd = &devlist, d = *dd; d; d = *dd) {
|
|
struct aoedev *doomed = NULL;
|
|
|
|
spin_lock(&d->lock);
|
|
if (d->flags & DEVFL_FREED) {
|
|
*dd = d->next;
|
|
doomed = d;
|
|
} else {
|
|
dd = &d->next;
|
|
}
|
|
spin_unlock(&d->lock);
|
|
if (doomed)
|
|
kfree(doomed->targets);
|
|
kfree(doomed);
|
|
}
|
|
spin_unlock_irqrestore(&devlist_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
aoedev_flush(const char __user *str, size_t cnt)
|
|
{
|
|
return flush(str, cnt, NOT_EXITING);
|
|
}
|
|
|
|
/* This has been confirmed to occur once with Tms=3*1000 due to the
|
|
* driver changing link and not processing its transmit ring. The
|
|
* problem is hard enough to solve by returning an error that I'm
|
|
* still punting on "solving" this.
|
|
*/
|
|
static void
|
|
skbfree(struct sk_buff *skb)
|
|
{
|
|
enum { Sms = 250, Tms = 30 * 1000};
|
|
int i = Tms / Sms;
|
|
|
|
if (skb == NULL)
|
|
return;
|
|
while (atomic_read(&skb_shinfo(skb)->dataref) != 1 && i-- > 0)
|
|
msleep(Sms);
|
|
if (i < 0) {
|
|
printk(KERN_ERR
|
|
"aoe: %s holds ref: %s\n",
|
|
skb->dev ? skb->dev->name : "netif",
|
|
"cannot free skb -- memory leaked.");
|
|
return;
|
|
}
|
|
skb->truesize -= skb->data_len;
|
|
skb_shinfo(skb)->nr_frags = skb->data_len = 0;
|
|
skb_trim(skb, 0);
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
static void
|
|
skbpoolfree(struct aoedev *d)
|
|
{
|
|
struct sk_buff *skb, *tmp;
|
|
|
|
skb_queue_walk_safe(&d->skbpool, skb, tmp)
|
|
skbfree(skb);
|
|
|
|
__skb_queue_head_init(&d->skbpool);
|
|
}
|
|
|
|
/* find it or allocate it */
|
|
struct aoedev *
|
|
aoedev_by_aoeaddr(ulong maj, int min, int do_alloc)
|
|
{
|
|
struct aoedev *d;
|
|
int i;
|
|
ulong flags;
|
|
ulong sysminor = 0;
|
|
|
|
spin_lock_irqsave(&devlist_lock, flags);
|
|
|
|
for (d=devlist; d; d=d->next)
|
|
if (d->aoemajor == maj && d->aoeminor == min) {
|
|
spin_lock(&d->lock);
|
|
if (d->flags & DEVFL_TKILL) {
|
|
spin_unlock(&d->lock);
|
|
d = NULL;
|
|
goto out;
|
|
}
|
|
d->ref++;
|
|
spin_unlock(&d->lock);
|
|
break;
|
|
}
|
|
if (d || !do_alloc || minor_get(&sysminor, maj, min) < 0)
|
|
goto out;
|
|
d = kcalloc(1, sizeof *d, GFP_ATOMIC);
|
|
if (!d)
|
|
goto out;
|
|
d->targets = kcalloc(NTARGETS, sizeof(*d->targets), GFP_ATOMIC);
|
|
if (!d->targets) {
|
|
kfree(d);
|
|
d = NULL;
|
|
goto out;
|
|
}
|
|
d->ntargets = NTARGETS;
|
|
INIT_WORK(&d->work, aoecmd_sleepwork);
|
|
spin_lock_init(&d->lock);
|
|
skb_queue_head_init(&d->skbpool);
|
|
init_timer(&d->timer);
|
|
d->timer.data = (ulong) d;
|
|
d->timer.function = dummy_timer;
|
|
d->timer.expires = jiffies + HZ;
|
|
add_timer(&d->timer);
|
|
d->bufpool = NULL; /* defer to aoeblk_gdalloc */
|
|
d->tgt = d->targets;
|
|
d->ref = 1;
|
|
for (i = 0; i < NFACTIVE; i++)
|
|
INIT_LIST_HEAD(&d->factive[i]);
|
|
INIT_LIST_HEAD(&d->rexmitq);
|
|
d->sysminor = sysminor;
|
|
d->aoemajor = maj;
|
|
d->aoeminor = min;
|
|
d->rttavg = RTTAVG_INIT;
|
|
d->rttdev = RTTDEV_INIT;
|
|
d->next = devlist;
|
|
devlist = d;
|
|
out:
|
|
spin_unlock_irqrestore(&devlist_lock, flags);
|
|
return d;
|
|
}
|
|
|
|
static void
|
|
freetgt(struct aoedev *d, struct aoetgt *t)
|
|
{
|
|
struct frame *f;
|
|
struct list_head *pos, *nx, *head;
|
|
struct aoeif *ifp;
|
|
|
|
for (ifp = t->ifs; ifp < &t->ifs[NAOEIFS]; ++ifp) {
|
|
if (!ifp->nd)
|
|
break;
|
|
dev_put(ifp->nd);
|
|
}
|
|
|
|
head = &t->ffree;
|
|
list_for_each_safe(pos, nx, head) {
|
|
list_del(pos);
|
|
f = list_entry(pos, struct frame, head);
|
|
skbfree(f->skb);
|
|
kfree(f);
|
|
}
|
|
kfree(t);
|
|
}
|
|
|
|
void
|
|
aoedev_exit(void)
|
|
{
|
|
flush_scheduled_work();
|
|
flush(NULL, 0, EXITING);
|
|
}
|
|
|
|
int __init
|
|
aoedev_init(void)
|
|
{
|
|
return 0;
|
|
}
|