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xen/blkfront: separate per ring information out of device info 

Split per ring information to a new structure "blkfront_ring_info".

A ring is the representation of a hardware queue, every vbd device can associate
with one or more rings depending on how many hardware queues/rings to be used.

This patch is a preparation for supporting real multi hardware queues/rings.

We also add a backpointer to 'struct blkfront_info' (dev_info) which
is not needed (we could use containers_of) but further patch
("xen/blkfront: pseudo support for multi hardware queues/rings")
will make allocation of 'blkfront_ring_info' dynamic.

Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Bob Liu 2015-11-14 11:12:11 +08:00 committed by Konrad Rzeszutek Wilk
parent eb5df87fab
commit 81f3516157
1 changed files with 196 additions and 161 deletions
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357
drivers/block/xen-blkfront.c
View File

@ -119,6 +119,23 @@ MODULE_PARM_DESC(max_ring_page_order, "Maximum order of pages to be used for the
*/
#define RINGREF_NAME_LEN (20)
/*
* Per-ring info.
* Every blkfront device can associate with one or more blkfront_ring_info,
* depending on how many hardware queues/rings to be used.
*/
struct blkfront_ring_info {
struct blkif_front_ring ring;
unsigned int ring_ref[XENBUS_MAX_RING_GRANTS];
unsigned int evtchn, irq;
struct work_struct work;
struct gnttab_free_callback callback;
struct blk_shadow shadow[BLK_MAX_RING_SIZE];
struct list_head indirect_pages;
unsigned long shadow_free;
struct blkfront_info *dev_info;
};
/*
* We have one of these per vbd, whether ide, scsi or 'other'. They
* hang in private_data off the gendisk structure. We may end up
@ -133,18 +150,10 @@ struct blkfront_info
int vdevice;
blkif_vdev_t handle;
enum blkif_state connected;
int ring_ref[XENBUS_MAX_RING_GRANTS];
unsigned int nr_ring_pages;
struct blkif_front_ring ring;
unsigned int evtchn, irq;
struct request_queue *rq;
struct work_struct work;
struct gnttab_free_callback callback;
struct blk_shadow shadow[BLK_MAX_RING_SIZE];
struct list_head grants;
struct list_head indirect_pages;
unsigned int persistent_gnts_c;
unsigned long shadow_free;
unsigned int feature_flush;
unsigned int feature_discard:1;
unsigned int feature_secdiscard:1;
@ -155,6 +164,7 @@ struct blkfront_info
unsigned int max_indirect_segments;
int is_ready;
struct blk_mq_tag_set tag_set;
struct blkfront_ring_info rinfo;
};
static unsigned int nr_minors;
@ -198,33 +208,35 @@ static DEFINE_SPINLOCK(minor_lock);
#define GREFS(_psegs) ((_psegs) * GRANTS_PER_PSEG)
static int blkfront_setup_indirect(struct blkfront_info *info);
static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo);
static int blkfront_gather_backend_features(struct blkfront_info *info);
static int get_id_from_freelist(struct blkfront_info *info)
static int get_id_from_freelist(struct blkfront_ring_info *rinfo)
{
unsigned long free = info->shadow_free;
BUG_ON(free >= BLK_RING_SIZE(info));
info->shadow_free = info->shadow[free].req.u.rw.id;
info->shadow[free].req.u.rw.id = 0x0fffffee; /* debug */
unsigned long free = rinfo->shadow_free;
BUG_ON(free >= BLK_RING_SIZE(rinfo->dev_info));
rinfo->shadow_free = rinfo->shadow[free].req.u.rw.id;
rinfo->shadow[free].req.u.rw.id = 0x0fffffee; /* debug */
return free;
}
static int add_id_to_freelist(struct blkfront_info *info,
static int add_id_to_freelist(struct blkfront_ring_info *rinfo,
unsigned long id)
{
if (info->shadow[id].req.u.rw.id != id)
if (rinfo->shadow[id].req.u.rw.id != id)
return -EINVAL;
if (info->shadow[id].request == NULL)
if (rinfo->shadow[id].request == NULL)
return -EINVAL;
info->shadow[id].req.u.rw.id = info->shadow_free;
info->shadow[id].request = NULL;
info->shadow_free = id;
rinfo->shadow[id].req.u.rw.id = rinfo->shadow_free;
rinfo->shadow[id].request = NULL;
rinfo->shadow_free = id;
return 0;
}
static int fill_grant_buffer(struct blkfront_info *info, int num)
static int fill_grant_buffer(struct blkfront_ring_info *rinfo, int num)
{
struct blkfront_info *info = rinfo->dev_info;
struct page *granted_page;
struct grant *gnt_list_entry, *n;
int i = 0;
@ -326,8 +338,8 @@ static struct grant *get_indirect_grant(grant_ref_t *gref_head,
struct page *indirect_page;
/* Fetch a pre-allocated page to use for indirect grefs */
BUG_ON(list_empty(&info->indirect_pages));
indirect_page = list_first_entry(&info->indirect_pages,
BUG_ON(list_empty(&info->rinfo.indirect_pages));
indirect_page = list_first_entry(&info->rinfo.indirect_pages,
struct page, lru);
list_del(&indirect_page->lru);
gnt_list_entry->page = indirect_page;
@ -403,8 +415,8 @@ static void xlbd_release_minors(unsigned int minor, unsigned int nr)
static void blkif_restart_queue_callback(void *arg)
{
struct blkfront_info *info = (struct blkfront_info *)arg;
schedule_work(&info->work);
struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)arg;
schedule_work(&rinfo->work);
}
static int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)
@ -456,16 +468,16 @@ static int blkif_ioctl(struct block_device *bdev, fmode_t mode,
return 0;
}
static int blkif_queue_discard_req(struct request *req)
static int blkif_queue_discard_req(struct request *req, struct blkfront_ring_info *rinfo)
{
struct blkfront_info *info = req->rq_disk->private_data;
struct blkfront_info *info = rinfo->dev_info;
struct blkif_request *ring_req;
unsigned long id;
/* Fill out a communications ring structure. */
ring_req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
id = get_id_from_freelist(info);
info->shadow[id].request = req;
ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);
id = get_id_from_freelist(rinfo);
rinfo->shadow[id].request = req;
ring_req->operation = BLKIF_OP_DISCARD;
ring_req->u.discard.nr_sectors = blk_rq_sectors(req);
@ -476,10 +488,10 @@ static int blkif_queue_discard_req(struct request *req)
else
ring_req->u.discard.flag = 0;
info->ring.req_prod_pvt++;
rinfo->ring.req_prod_pvt++;
/* Keep a private copy so we can reissue requests when recovering. */
info->shadow[id].req = *ring_req;
rinfo->shadow[id].req = *ring_req;
return 0;
}
@ -487,7 +499,7 @@ static int blkif_queue_discard_req(struct request *req)
struct setup_rw_req {
unsigned int grant_idx;
struct blkif_request_segment *segments;
struct blkfront_info *info;
struct blkfront_ring_info *rinfo;
struct blkif_request *ring_req;
grant_ref_t gref_head;
unsigned int id;
@ -507,8 +519,9 @@ static void blkif_setup_rw_req_grant(unsigned long gfn, unsigned int offset,
/* Convenient aliases */
unsigned int grant_idx = setup->grant_idx;
struct blkif_request *ring_req = setup->ring_req;
struct blkfront_info *info = setup->info;
struct blk_shadow *shadow = &info->shadow[setup->id];
struct blkfront_ring_info *rinfo = setup->rinfo;
struct blkfront_info *info = rinfo->dev_info;
struct blk_shadow *shadow = &rinfo->shadow[setup->id];
if ((ring_req->operation == BLKIF_OP_INDIRECT) &&
(grant_idx % GRANTS_PER_INDIRECT_FRAME == 0)) {
@ -566,16 +579,16 @@ static void blkif_setup_rw_req_grant(unsigned long gfn, unsigned int offset,
(setup->grant_idx)++;
}
static int blkif_queue_rw_req(struct request *req)
static int blkif_queue_rw_req(struct request *req, struct blkfront_ring_info *rinfo)
{
struct blkfront_info *info = req->rq_disk->private_data;
struct blkfront_info *info = rinfo->dev_info;
struct blkif_request *ring_req;
unsigned long id;
int i;
struct setup_rw_req setup = {
.grant_idx = 0,
.segments = NULL,
.info = info,
.rinfo = rinfo,
.need_copy = rq_data_dir(req) && info->feature_persistent,
};
@ -603,9 +616,9 @@ static int blkif_queue_rw_req(struct request *req)
max_grefs - info->persistent_gnts_c,
&setup.gref_head) < 0) {
gnttab_request_free_callback(
&info->callback,
&rinfo->callback,
blkif_restart_queue_callback,
info,
rinfo,
max_grefs);
return 1;
}
@ -613,23 +626,23 @@ static int blkif_queue_rw_req(struct request *req)
new_persistent_gnts = 0;
/* Fill out a communications ring structure. */
ring_req = RING_GET_REQUEST(&info->ring, info->ring.req_prod_pvt);
id = get_id_from_freelist(info);
info->shadow[id].request = req;
ring_req = RING_GET_REQUEST(&rinfo->ring, rinfo->ring.req_prod_pvt);
id = get_id_from_freelist(rinfo);
rinfo->shadow[id].request = req;
BUG_ON(info->max_indirect_segments == 0 &&
GREFS(req->nr_phys_segments) > BLKIF_MAX_SEGMENTS_PER_REQUEST);
BUG_ON(info->max_indirect_segments &&
GREFS(req->nr_phys_segments) > info->max_indirect_segments);
num_sg = blk_rq_map_sg(req->q, req, info->shadow[id].sg);
num_sg = blk_rq_map_sg(req->q, req, rinfo->shadow[id].sg);
num_grant = 0;
/* Calculate the number of grant used */
for_each_sg(info->shadow[id].sg, sg, num_sg, i)
for_each_sg(rinfo->shadow[id].sg, sg, num_sg, i)
num_grant += gnttab_count_grant(sg->offset, sg->length);
ring_req->u.rw.id = id;
info->shadow[id].num_sg = num_sg;
rinfo->shadow[id].num_sg = num_sg;
if (num_grant > BLKIF_MAX_SEGMENTS_PER_REQUEST) {
/*
* The indirect operation can only be a BLKIF_OP_READ or
@ -674,7 +687,7 @@ static int blkif_queue_rw_req(struct request *req)
setup.ring_req = ring_req;
setup.id = id;
for_each_sg(info->shadow[id].sg, sg, num_sg, i) {
for_each_sg(rinfo->shadow[id].sg, sg, num_sg, i) {
BUG_ON(sg->offset + sg->length > PAGE_SIZE);
if (setup.need_copy) {
@ -694,10 +707,10 @@ static int blkif_queue_rw_req(struct request *req)
if (setup.segments)
kunmap_atomic(setup.segments);
info->ring.req_prod_pvt++;
rinfo->ring.req_prod_pvt++;
/* Keep a private copy so we can reissue requests when recovering. */
info->shadow[id].req = *ring_req;
rinfo->shadow[id].req = *ring_req;
if (new_persistent_gnts)
gnttab_free_grant_references(setup.gref_head);
@ -711,27 +724,25 @@ static int blkif_queue_rw_req(struct request *req)
*
* @req: a request struct
*/
static int blkif_queue_request(struct request *req)
static int blkif_queue_request(struct request *req, struct blkfront_ring_info *rinfo)
{
struct blkfront_info *info = req->rq_disk->private_data;
if (unlikely(info->connected != BLKIF_STATE_CONNECTED))
if (unlikely(rinfo->dev_info->connected != BLKIF_STATE_CONNECTED))
return 1;
if (unlikely(req->cmd_flags & (REQ_DISCARD | REQ_SECURE)))
return blkif_queue_discard_req(req);
return blkif_queue_discard_req(req, rinfo);
else
return blkif_queue_rw_req(req);
return blkif_queue_rw_req(req, rinfo);
}
static inline void flush_requests(struct blkfront_info *info)
static inline void flush_requests(struct blkfront_ring_info *rinfo)
{
int notify;
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&info->ring, notify);
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&rinfo->ring, notify);
if (notify)
notify_remote_via_irq(info->irq);
notify_remote_via_irq(rinfo->irq);
}
static inline bool blkif_request_flush_invalid(struct request *req,
@ -747,20 +758,21 @@ static inline bool blkif_request_flush_invalid(struct request *req,
static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *qd)
{
struct blkfront_info *info = qd->rq->rq_disk->private_data;
struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)hctx->driver_data;
struct blkfront_info *info = rinfo->dev_info;
blk_mq_start_request(qd->rq);
spin_lock_irq(&info->io_lock);
if (RING_FULL(&info->ring))
if (RING_FULL(&rinfo->ring))
goto out_busy;
if (blkif_request_flush_invalid(qd->rq, info))
if (blkif_request_flush_invalid(qd->rq, rinfo->dev_info))
goto out_err;
if (blkif_queue_request(qd->rq))
if (blkif_queue_request(qd->rq, rinfo))
goto out_busy;
flush_requests(info);
flush_requests(rinfo);
spin_unlock_irq(&info->io_lock);
return BLK_MQ_RQ_QUEUE_OK;
@ -774,9 +786,19 @@ out_busy:
return BLK_MQ_RQ_QUEUE_BUSY;
}
static int blk_mq_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
unsigned int index)
{
struct blkfront_info *info = (struct blkfront_info *)data;
hctx->driver_data = &info->rinfo;
return 0;
}
static struct blk_mq_ops blkfront_mq_ops = {
.queue_rq = blkif_queue_rq,
.map_queue = blk_mq_map_queue,
.init_hctx = blk_mq_init_hctx,
};
static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
@ -1029,6 +1051,7 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
static void xlvbd_release_gendisk(struct blkfront_info *info)
{
unsigned int minor, nr_minors;
struct blkfront_ring_info *rinfo = &info->rinfo;
if (info->rq == NULL)
return;
@ -1037,10 +1060,10 @@ static void xlvbd_release_gendisk(struct blkfront_info *info)
blk_mq_stop_hw_queues(info->rq);
/* No more gnttab callback work. */
gnttab_cancel_free_callback(&info->callback);
gnttab_cancel_free_callback(&rinfo->callback);
/* Flush gnttab callback work. Must be done with no locks held. */
flush_work(&info->work);
flush_work(&rinfo->work);
del_gendisk(info->gd);
@ -1057,20 +1080,20 @@ static void xlvbd_release_gendisk(struct blkfront_info *info)
}
/* Must be called with io_lock holded */
static void kick_pending_request_queues(struct blkfront_info *info)
static void kick_pending_request_queues(struct blkfront_ring_info *rinfo)
{
if (!RING_FULL(&info->ring))
blk_mq_start_stopped_hw_queues(info->rq, true);
if (!RING_FULL(&rinfo->ring))
blk_mq_start_stopped_hw_queues(rinfo->dev_info->rq, true);
}
static void blkif_restart_queue(struct work_struct *work)
{
struct blkfront_info *info = container_of(work, struct blkfront_info, work);
struct blkfront_ring_info *rinfo = container_of(work, struct blkfront_ring_info, work);
spin_lock_irq(&info->io_lock);
if (info->connected == BLKIF_STATE_CONNECTED)
kick_pending_request_queues(info);
spin_unlock_irq(&info->io_lock);
spin_lock_irq(&rinfo->dev_info->io_lock);
if (rinfo->dev_info->connected == BLKIF_STATE_CONNECTED)
kick_pending_request_queues(rinfo);
spin_unlock_irq(&rinfo->dev_info->io_lock);
}
static void blkif_free(struct blkfront_info *info, int suspend)
@ -1078,6 +1101,7 @@ static void blkif_free(struct blkfront_info *info, int suspend)
struct grant *persistent_gnt;
struct grant *n;
int i, j, segs;
struct blkfront_ring_info *rinfo = &info->rinfo;
/* Prevent new requests being issued until we fix things up. */
spin_lock_irq(&info->io_lock);
@ -1090,7 +1114,7 @@ static void blkif_free(struct blkfront_info *info, int suspend)
/* Remove all persistent grants */
if (!list_empty(&info->grants)) {
list_for_each_entry_safe(persistent_gnt, n,
&info->grants, node) {
&info->grants, node) {
list_del(&persistent_gnt->node);
if (persistent_gnt->gref != GRANT_INVALID_REF) {
gnttab_end_foreign_access(persistent_gnt->gref,
@ -1108,11 +1132,11 @@ static void blkif_free(struct blkfront_info *info, int suspend)
* Remove indirect pages, this only happens when using indirect
* descriptors but not persistent grants
*/
if (!list_empty(&info->indirect_pages)) {
if (!list_empty(&rinfo->indirect_pages)) {
struct page *indirect_page, *n;
BUG_ON(info->feature_persistent);
list_for_each_entry_safe(indirect_page, n, &info->indirect_pages, lru) {
list_for_each_entry_safe(indirect_page, n, &rinfo->indirect_pages, lru) {
list_del(&indirect_page->lru);
__free_page(indirect_page);
}
@ -1123,21 +1147,21 @@ static void blkif_free(struct blkfront_info *info, int suspend)
* Clear persistent grants present in requests already
* on the shared ring
*/
if (!info->shadow[i].request)
if (!rinfo->shadow[i].request)
goto free_shadow;
segs = info->shadow[i].req.operation == BLKIF_OP_INDIRECT ?
info->shadow[i].req.u.indirect.nr_segments :
info->shadow[i].req.u.rw.nr_segments;
segs = rinfo->shadow[i].req.operation == BLKIF_OP_INDIRECT ?
rinfo->shadow[i].req.u.indirect.nr_segments :
rinfo->shadow[i].req.u.rw.nr_segments;
for (j = 0; j < segs; j++) {
persistent_gnt = info->shadow[i].grants_used[j];
persistent_gnt = rinfo->shadow[i].grants_used[j];
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
if (info->feature_persistent)
__free_page(persistent_gnt->page);
kfree(persistent_gnt);
}
if (info->shadow[i].req.operation != BLKIF_OP_INDIRECT)
if (rinfo->shadow[i].req.operation != BLKIF_OP_INDIRECT)
/*
* If this is not an indirect operation don't try to
* free indirect segments
@ -1145,41 +1169,41 @@ static void blkif_free(struct blkfront_info *info, int suspend)
goto free_shadow;
for (j = 0; j < INDIRECT_GREFS(segs); j++) {
persistent_gnt = info->shadow[i].indirect_grants[j];
persistent_gnt = rinfo->shadow[i].indirect_grants[j];
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
__free_page(persistent_gnt->page);
kfree(persistent_gnt);
}
free_shadow:
kfree(info->shadow[i].grants_used);
info->shadow[i].grants_used = NULL;
kfree(info->shadow[i].indirect_grants);
info->shadow[i].indirect_grants = NULL;
kfree(info->shadow[i].sg);
info->shadow[i].sg = NULL;
kfree(rinfo->shadow[i].grants_used);
rinfo->shadow[i].grants_used = NULL;
kfree(rinfo->shadow[i].indirect_grants);
rinfo->shadow[i].indirect_grants = NULL;
kfree(rinfo->shadow[i].sg);
rinfo->shadow[i].sg = NULL;
}
/* No more gnttab callback work. */
gnttab_cancel_free_callback(&info->callback);
gnttab_cancel_free_callback(&rinfo->callback);
spin_unlock_irq(&info->io_lock);
/* Flush gnttab callback work. Must be done with no locks held. */
flush_work(&info->work);
flush_work(&rinfo->work);
/* Free resources associated with old device channel. */
for (i = 0; i < info->nr_ring_pages; i++) {
if (info->ring_ref[i] != GRANT_INVALID_REF) {
gnttab_end_foreign_access(info->ring_ref[i], 0, 0);
info->ring_ref[i] = GRANT_INVALID_REF;
if (rinfo->ring_ref[i] != GRANT_INVALID_REF) {
gnttab_end_foreign_access(rinfo->ring_ref[i], 0, 0);
rinfo->ring_ref[i] = GRANT_INVALID_REF;
}
}
free_pages((unsigned long)info->ring.sring, get_order(info->nr_ring_pages * PAGE_SIZE));
info->ring.sring = NULL;
free_pages((unsigned long)rinfo->ring.sring, get_order(info->nr_ring_pages * PAGE_SIZE));
rinfo->ring.sring = NULL;
if (info->irq)
unbind_from_irqhandler(info->irq, info);
info->evtchn = info->irq = 0;
if (rinfo->irq)
unbind_from_irqhandler(rinfo->irq, rinfo);
rinfo->evtchn = rinfo->irq = 0;
}
@ -1209,12 +1233,13 @@ static void blkif_copy_from_grant(unsigned long gfn, unsigned int offset,
kunmap_atomic(shared_data);
}
static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info,
static void blkif_completion(struct blk_shadow *s, struct blkfront_ring_info *rinfo,
struct blkif_response *bret)
{
int i = 0;
struct scatterlist *sg;
int num_sg, num_grant;
struct blkfront_info *info = rinfo->dev_info;
struct copy_from_grant data = {
.s = s,
.grant_idx = 0,
@ -1284,7 +1309,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info,
*/
if (!info->feature_persistent) {
indirect_page = s->indirect_grants[i]->page;
list_add(&indirect_page->lru, &info->indirect_pages);
list_add(&indirect_page->lru, &rinfo->indirect_pages);
}
s->indirect_grants[i]->gref = GRANT_INVALID_REF;
list_add_tail(&s->indirect_grants[i]->node, &info->grants);
@ -1299,7 +1324,8 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
struct blkif_response *bret;
RING_IDX i, rp;
unsigned long flags;
struct blkfront_info *info = (struct blkfront_info *)dev_id;
struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)dev_id;
struct blkfront_info *info = rinfo->dev_info;
int error;
spin_lock_irqsave(&info->io_lock, flags);
@ -1310,13 +1336,13 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
}
again:
rp = info->ring.sring->rsp_prod;
rp = rinfo->ring.sring->rsp_prod;
rmb(); /* Ensure we see queued responses up to 'rp'. */
for (i = info->ring.rsp_cons; i != rp; i++) {
for (i = rinfo->ring.rsp_cons; i != rp; i++) {
unsigned long id;
bret = RING_GET_RESPONSE(&info->ring, i);
bret = RING_GET_RESPONSE(&rinfo->ring, i);
id = bret->id;
/*
* The backend has messed up and given us an id that we would
@ -1330,12 +1356,12 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
* the id is busted. */
continue;
}
req = info->shadow[id].request;
req = rinfo->shadow[id].request;
if (bret->operation != BLKIF_OP_DISCARD)
blkif_completion(&info->shadow[id], info, bret);
blkif_completion(&rinfo->shadow[id], rinfo, bret);
if (add_id_to_freelist(info, id)) {
if (add_id_to_freelist(rinfo, id)) {
WARN(1, "%s: response to %s (id %ld) couldn't be recycled!\n",
info->gd->disk_name, op_name(bret->operation), id);
continue;
@ -1364,7 +1390,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
error = -EOPNOTSUPP;
}
if (unlikely(bret->status == BLKIF_RSP_ERROR &&
info->shadow[id].req.u.rw.nr_segments == 0)) {
rinfo->shadow[id].req.u.rw.nr_segments == 0)) {
printk(KERN_WARNING "blkfront: %s: empty %s op failed\n",
info->gd->disk_name, op_name(bret->operation));
error = -EOPNOTSUPP;
@ -1389,17 +1415,17 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
}
}
info->ring.rsp_cons = i;
rinfo->ring.rsp_cons = i;
if (i != info->ring.req_prod_pvt) {
if (i != rinfo->ring.req_prod_pvt) {
int more_to_do;
RING_FINAL_CHECK_FOR_RESPONSES(&info->ring, more_to_do);
RING_FINAL_CHECK_FOR_RESPONSES(&rinfo->ring, more_to_do);
if (more_to_do)
goto again;
} else
info->ring.sring->rsp_event = i + 1;
rinfo->ring.sring->rsp_event = i + 1;
kick_pending_request_queues(info);
kick_pending_request_queues(rinfo);
spin_unlock_irqrestore(&info->io_lock, flags);
@ -1408,15 +1434,16 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
static int setup_blkring(struct xenbus_device *dev,
struct blkfront_info *info)
struct blkfront_ring_info *rinfo)
{
struct blkif_sring *sring;
int err, i;
struct blkfront_info *info = rinfo->dev_info;
unsigned long ring_size = info->nr_ring_pages * XEN_PAGE_SIZE;
grant_ref_t gref[XENBUS_MAX_RING_GRANTS];
for (i = 0; i < info->nr_ring_pages; i++)
info->ring_ref[i] = GRANT_INVALID_REF;
rinfo->ring_ref[i] = GRANT_INVALID_REF;
sring = (struct blkif_sring *)__get_free_pages(GFP_NOIO | __GFP_HIGH,
get_order(ring_size));
@ -1425,29 +1452,29 @@ static int setup_blkring(struct xenbus_device *dev,
return -ENOMEM;
}
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, ring_size);
FRONT_RING_INIT(&rinfo->ring, sring, ring_size);
err = xenbus_grant_ring(dev, info->ring.sring, info->nr_ring_pages, gref);
err = xenbus_grant_ring(dev, rinfo->ring.sring, info->nr_ring_pages, gref);
if (err < 0) {
free_pages((unsigned long)sring, get_order(ring_size));
info->ring.sring = NULL;
rinfo->ring.sring = NULL;
goto fail;
}
for (i = 0; i < info->nr_ring_pages; i++)
info->ring_ref[i] = gref[i];
rinfo->ring_ref[i] = gref[i];
err = xenbus_alloc_evtchn(dev, &info->evtchn);
err = xenbus_alloc_evtchn(dev, &rinfo->evtchn);
if (err)
goto fail;
err = bind_evtchn_to_irqhandler(info->evtchn, blkif_interrupt, 0,
"blkif", info);
err = bind_evtchn_to_irqhandler(rinfo->evtchn, blkif_interrupt, 0,
"blkif", rinfo);
if (err <= 0) {
xenbus_dev_fatal(dev, err,
"bind_evtchn_to_irqhandler failed");
goto fail;
}
info->irq = err;
rinfo->irq = err;
return 0;
fail:
@ -1465,6 +1492,7 @@ static int talk_to_blkback(struct xenbus_device *dev,
int err, i;
unsigned int max_page_order = 0;
unsigned int ring_page_order = 0;
struct blkfront_ring_info *rinfo = &info->rinfo;
err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
"max-ring-page-order", "%u", &max_page_order);
@ -1476,7 +1504,7 @@ static int talk_to_blkback(struct xenbus_device *dev,
}
/* Create shared ring, alloc event channel. */
err = setup_blkring(dev, info);
err = setup_blkring(dev, rinfo);
if (err)
goto out;
@ -1489,7 +1517,7 @@ again:
if (info->nr_ring_pages == 1) {
err = xenbus_printf(xbt, dev->nodename,
"ring-ref", "%u", info->ring_ref[0]);
"ring-ref", "%u", rinfo->ring_ref[0]);
if (err) {
message = "writing ring-ref";
goto abort_transaction;
@ -1507,7 +1535,7 @@ again:
snprintf(ring_ref_name, RINGREF_NAME_LEN, "ring-ref%u", i);
err = xenbus_printf(xbt, dev->nodename, ring_ref_name,
"%u", info->ring_ref[i]);
"%u", rinfo->ring_ref[i]);
if (err) {
message = "writing ring-ref";
goto abort_transaction;
@ -1515,7 +1543,7 @@ again:
}
}
err = xenbus_printf(xbt, dev->nodename,
"event-channel", "%u", info->evtchn);
"event-channel", "%u", rinfo->evtchn);
if (err) {
message = "writing event-channel";
goto abort_transaction;
@ -1541,8 +1569,8 @@ again:
}
for (i = 0; i < BLK_RING_SIZE(info); i++)
info->shadow[i].req.u.rw.id = i+1;
info->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
rinfo->shadow[i].req.u.rw.id = i+1;
rinfo->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
xenbus_switch_state(dev, XenbusStateInitialised);
return 0;
@ -1568,6 +1596,7 @@ static int blkfront_probe(struct xenbus_device *dev,
{
int err, vdevice;
struct blkfront_info *info;
struct blkfront_ring_info *rinfo;
/* FIXME: Use dynamic device id if this is not set. */
err = xenbus_scanf(XBT_NIL, dev->nodename,
@ -1617,15 +1646,18 @@ static int blkfront_probe(struct xenbus_device *dev,
return -ENOMEM;
}
rinfo = &info->rinfo;
INIT_LIST_HEAD(&rinfo->indirect_pages);
rinfo->dev_info = info;
INIT_WORK(&rinfo->work, blkif_restart_queue);
mutex_init(&info->mutex);
spin_lock_init(&info->io_lock);
info->xbdev = dev;
info->vdevice = vdevice;
INIT_LIST_HEAD(&info->grants);
INIT_LIST_HEAD(&info->indirect_pages);
info->persistent_gnts_c = 0;
info->connected = BLKIF_STATE_DISCONNECTED;
INIT_WORK(&info->work, blkif_restart_queue);
/* Front end dir is a number, which is used as the id. */
info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
@ -1659,19 +1691,20 @@ static int blkif_recover(struct blkfront_info *info)
int pending, size;
struct split_bio *split_bio;
struct list_head requests;
struct blkfront_ring_info *rinfo = &info->rinfo;
/* Stage 1: Make a safe copy of the shadow state. */
copy = kmemdup(info->shadow, sizeof(info->shadow),
copy = kmemdup(rinfo->shadow, sizeof(rinfo->shadow),
GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
if (!copy)
return -ENOMEM;
/* Stage 2: Set up free list. */
memset(&info->shadow, 0, sizeof(info->shadow));
memset(&rinfo->shadow, 0, sizeof(rinfo->shadow));
for (i = 0; i < BLK_RING_SIZE(info); i++)
info->shadow[i].req.u.rw.id = i+1;
info->shadow_free = info->ring.req_prod_pvt;
info->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
rinfo->shadow[i].req.u.rw.id = i+1;
rinfo->shadow_free = rinfo->ring.req_prod_pvt;
rinfo->shadow[BLK_RING_SIZE(info)-1].req.u.rw.id = 0x0fffffff;
rc = blkfront_gather_backend_features(info);
if (rc) {
@ -1717,7 +1750,7 @@ static int blkif_recover(struct blkfront_info *info)
info->connected = BLKIF_STATE_CONNECTED;
/* Kick any other new requests queued since we resumed */
kick_pending_request_queues(info);
kick_pending_request_queues(rinfo);
list_for_each_entry_safe(req, n, &requests, queuelist) {
/* Requeue pending requests (flush or discard) */
@ -1851,10 +1884,11 @@ static void blkfront_setup_discard(struct blkfront_info *info)
info->feature_secdiscard = !!discard_secure;
}
static int blkfront_setup_indirect(struct blkfront_info *info)
static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo)
{
unsigned int psegs, grants;
int err, i;
struct blkfront_info *info = rinfo->dev_info;
if (info->max_indirect_segments == 0)
grants = BLKIF_MAX_SEGMENTS_PER_REQUEST;
@ -1862,7 +1896,7 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
grants = info->max_indirect_segments;
psegs = grants / GRANTS_PER_PSEG;
err = fill_grant_buffer(info,
err = fill_grant_buffer(rinfo,
(grants + INDIRECT_GREFS(grants)) * BLK_RING_SIZE(info));
if (err)
goto out_of_memory;
@ -1875,31 +1909,31 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
*/
int num = INDIRECT_GREFS(grants) * BLK_RING_SIZE(info);
BUG_ON(!list_empty(&info->indirect_pages));
BUG_ON(!list_empty(&rinfo->indirect_pages));
for (i = 0; i < num; i++) {
struct page *indirect_page = alloc_page(GFP_NOIO);
if (!indirect_page)
goto out_of_memory;
list_add(&indirect_page->lru, &info->indirect_pages);
list_add(&indirect_page->lru, &rinfo->indirect_pages);
}
}
for (i = 0; i < BLK_RING_SIZE(info); i++) {
info->shadow[i].grants_used = kzalloc(
sizeof(info->shadow[i].grants_used[0]) * grants,
rinfo->shadow[i].grants_used = kzalloc(
sizeof(rinfo->shadow[i].grants_used[0]) * grants,
GFP_NOIO);
info->shadow[i].sg = kzalloc(sizeof(info->shadow[i].sg[0]) * psegs, GFP_NOIO);
rinfo->shadow[i].sg = kzalloc(sizeof(rinfo->shadow[i].sg[0]) * psegs, GFP_NOIO);
if (info->max_indirect_segments)
info->shadow[i].indirect_grants = kzalloc(
sizeof(info->shadow[i].indirect_grants[0]) *
rinfo->shadow[i].indirect_grants = kzalloc(
sizeof(rinfo->shadow[i].indirect_grants[0]) *
INDIRECT_GREFS(grants),
GFP_NOIO);
if ((info->shadow[i].grants_used == NULL) ||
(info->shadow[i].sg == NULL) ||
if ((rinfo->shadow[i].grants_used == NULL) ||
(rinfo->shadow[i].sg == NULL) ||
(info->max_indirect_segments &&
(info->shadow[i].indirect_grants == NULL)))
(rinfo->shadow[i].indirect_grants == NULL)))
goto out_of_memory;
sg_init_table(info->shadow[i].sg, psegs);
sg_init_table(rinfo->shadow[i].sg, psegs);
}
@ -1907,16 +1941,16 @@ static int blkfront_setup_indirect(struct blkfront_info *info)
out_of_memory:
for (i = 0; i < BLK_RING_SIZE(info); i++) {
kfree(info->shadow[i].grants_used);
info->shadow[i].grants_used = NULL;
kfree(info->shadow[i].sg);
info->shadow[i].sg = NULL;
kfree(info->shadow[i].indirect_grants);
info->shadow[i].indirect_grants = NULL;
kfree(rinfo->shadow[i].grants_used);
rinfo->shadow[i].grants_used = NULL;
kfree(rinfo->shadow[i].sg);
rinfo->shadow[i].sg = NULL;
kfree(rinfo->shadow[i].indirect_grants);
rinfo->shadow[i].indirect_grants = NULL;
}
if (!list_empty(&info->indirect_pages)) {
if (!list_empty(&rinfo->indirect_pages)) {
struct page *indirect_page, *n;
list_for_each_entry_safe(indirect_page, n, &info->indirect_pages, lru) {
list_for_each_entry_safe(indirect_page, n, &rinfo->indirect_pages, lru) {
list_del(&indirect_page->lru);
__free_page(indirect_page);
}
@ -1983,7 +2017,7 @@ static int blkfront_gather_backend_features(struct blkfront_info *info)
info->max_indirect_segments = min(indirect_segments,
xen_blkif_max_segments);
return blkfront_setup_indirect(info);
return blkfront_setup_indirect(&info->rinfo);
}
/*
@ -1997,6 +2031,7 @@ static void blkfront_connect(struct blkfront_info *info)
unsigned int physical_sector_size;
unsigned int binfo;
int err;
struct blkfront_ring_info *rinfo = &info->rinfo;
switch (info->connected) {
case BLKIF_STATE_CONNECTED:
@ -2073,7 +2108,7 @@ static void blkfront_connect(struct blkfront_info *info)
/* Kick pending requests. */
spin_lock_irq(&info->io_lock);
info->connected = BLKIF_STATE_CONNECTED;
kick_pending_request_queues(info);
kick_pending_request_queues(rinfo);
spin_unlock_irq(&info->io_lock);
add_disk(info->gd);