[PATCH 01/25] null_blk: remove lightnvm support
From: Matias BjÃrling
Date: Wed Dec 20 2017 - 12:30:50 EST
With rrpc to be removed, the null_blk lightnvm support is no longer
functional. Remove the lightnvm implementation and maybe add it to
another module in the future if someone takes on the challenge.
Signed-off-by: Matias BjÃrling <m@xxxxxxxxxxx>
---
drivers/block/null_blk.c | 220 +----------------------------------------------
1 file changed, 3 insertions(+), 217 deletions(-)
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index bf2c8ca..842bced 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -12,7 +12,6 @@
#include <linux/slab.h>
#include <linux/blk-mq.h>
#include <linux/hrtimer.h>
-#include <linux/lightnvm.h>
#include <linux/configfs.h>
#include <linux/badblocks.h>
@@ -107,7 +106,6 @@ struct nullb_device {
unsigned int hw_queue_depth; /* queue depth */
unsigned int index; /* index of the disk, only valid with a disk */
unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */
- bool use_lightnvm; /* register as a LightNVM device */
bool blocking; /* blocking blk-mq device */
bool use_per_node_hctx; /* use per-node allocation for hardware context */
bool power; /* power on/off the device */
@@ -121,7 +119,6 @@ struct nullb {
unsigned int index;
struct request_queue *q;
struct gendisk *disk;
- struct nvm_dev *ndev;
struct blk_mq_tag_set *tag_set;
struct blk_mq_tag_set __tag_set;
unsigned int queue_depth;
@@ -139,7 +136,6 @@ static LIST_HEAD(nullb_list);
static struct mutex lock;
static int null_major;
static DEFINE_IDA(nullb_indexes);
-static struct kmem_cache *ppa_cache;
static struct blk_mq_tag_set tag_set;
enum {
@@ -208,10 +204,6 @@ static int nr_devices = 1;
module_param(nr_devices, int, S_IRUGO);
MODULE_PARM_DESC(nr_devices, "Number of devices to register");
-static bool g_use_lightnvm;
-module_param_named(use_lightnvm, g_use_lightnvm, bool, S_IRUGO);
-MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device");
-
static bool g_blocking;
module_param_named(blocking, g_blocking, bool, S_IRUGO);
MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device");
@@ -345,7 +337,6 @@ NULLB_DEVICE_ATTR(blocksize, uint);
NULLB_DEVICE_ATTR(irqmode, uint);
NULLB_DEVICE_ATTR(hw_queue_depth, uint);
NULLB_DEVICE_ATTR(index, uint);
-NULLB_DEVICE_ATTR(use_lightnvm, bool);
NULLB_DEVICE_ATTR(blocking, bool);
NULLB_DEVICE_ATTR(use_per_node_hctx, bool);
NULLB_DEVICE_ATTR(memory_backed, bool);
@@ -455,7 +446,6 @@ static struct configfs_attribute *nullb_device_attrs[] = {
&nullb_device_attr_irqmode,
&nullb_device_attr_hw_queue_depth,
&nullb_device_attr_index,
- &nullb_device_attr_use_lightnvm,
&nullb_device_attr_blocking,
&nullb_device_attr_use_per_node_hctx,
&nullb_device_attr_power,
@@ -574,7 +564,6 @@ static struct nullb_device *null_alloc_dev(void)
dev->blocksize = g_bs;
dev->irqmode = g_irqmode;
dev->hw_queue_depth = g_hw_queue_depth;
- dev->use_lightnvm = g_use_lightnvm;
dev->blocking = g_blocking;
dev->use_per_node_hctx = g_use_per_node_hctx;
return dev;
@@ -1420,170 +1409,6 @@ static void cleanup_queues(struct nullb *nullb)
kfree(nullb->queues);
}
-#ifdef CONFIG_NVM
-
-static void null_lnvm_end_io(struct request *rq, blk_status_t status)
-{
- struct nvm_rq *rqd = rq->end_io_data;
-
- /* XXX: lighnvm core seems to expect NVM_RSP_* values here.. */
- rqd->error = status ? -EIO : 0;
- nvm_end_io(rqd);
-
- blk_put_request(rq);
-}
-
-static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
-{
- struct request_queue *q = dev->q;
- struct request *rq;
- struct bio *bio = rqd->bio;
-
- rq = blk_mq_alloc_request(q,
- op_is_write(bio_op(bio)) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
- if (IS_ERR(rq))
- return -ENOMEM;
-
- blk_init_request_from_bio(rq, bio);
-
- rq->end_io_data = rqd;
-
- blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io);
-
- return 0;
-}
-
-static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id)
-{
- struct nullb *nullb = dev->q->queuedata;
- sector_t size = (sector_t)nullb->dev->size * 1024 * 1024ULL;
- sector_t blksize;
- struct nvm_id_group *grp;
-
- id->ver_id = 0x1;
- id->vmnt = 0;
- id->cap = 0x2;
- id->dom = 0x1;
-
- id->ppaf.blk_offset = 0;
- id->ppaf.blk_len = 16;
- id->ppaf.pg_offset = 16;
- id->ppaf.pg_len = 16;
- id->ppaf.sect_offset = 32;
- id->ppaf.sect_len = 8;
- id->ppaf.pln_offset = 40;
- id->ppaf.pln_len = 8;
- id->ppaf.lun_offset = 48;
- id->ppaf.lun_len = 8;
- id->ppaf.ch_offset = 56;
- id->ppaf.ch_len = 8;
-
- sector_div(size, nullb->dev->blocksize); /* convert size to pages */
- size >>= 8; /* concert size to pgs pr blk */
- grp = &id->grp;
- grp->mtype = 0;
- grp->fmtype = 0;
- grp->num_ch = 1;
- grp->num_pg = 256;
- blksize = size;
- size >>= 16;
- grp->num_lun = size + 1;
- sector_div(blksize, grp->num_lun);
- grp->num_blk = blksize;
- grp->num_pln = 1;
-
- grp->fpg_sz = nullb->dev->blocksize;
- grp->csecs = nullb->dev->blocksize;
- grp->trdt = 25000;
- grp->trdm = 25000;
- grp->tprt = 500000;
- grp->tprm = 500000;
- grp->tbet = 1500000;
- grp->tbem = 1500000;
- grp->mpos = 0x010101; /* single plane rwe */
- grp->cpar = nullb->dev->hw_queue_depth;
-
- return 0;
-}
-
-static void *null_lnvm_create_dma_pool(struct nvm_dev *dev, char *name)
-{
- mempool_t *virtmem_pool;
-
- virtmem_pool = mempool_create_slab_pool(64, ppa_cache);
- if (!virtmem_pool) {
- pr_err("null_blk: Unable to create virtual memory pool\n");
- return NULL;
- }
-
- return virtmem_pool;
-}
-
-static void null_lnvm_destroy_dma_pool(void *pool)
-{
- mempool_destroy(pool);
-}
-
-static void *null_lnvm_dev_dma_alloc(struct nvm_dev *dev, void *pool,
- gfp_t mem_flags, dma_addr_t *dma_handler)
-{
- return mempool_alloc(pool, mem_flags);
-}
-
-static void null_lnvm_dev_dma_free(void *pool, void *entry,
- dma_addr_t dma_handler)
-{
- mempool_free(entry, pool);
-}
-
-static struct nvm_dev_ops null_lnvm_dev_ops = {
- .identity = null_lnvm_id,
- .submit_io = null_lnvm_submit_io,
-
- .create_dma_pool = null_lnvm_create_dma_pool,
- .destroy_dma_pool = null_lnvm_destroy_dma_pool,
- .dev_dma_alloc = null_lnvm_dev_dma_alloc,
- .dev_dma_free = null_lnvm_dev_dma_free,
-
- /* Simulate nvme protocol restriction */
- .max_phys_sect = 64,
-};
-
-static int null_nvm_register(struct nullb *nullb)
-{
- struct nvm_dev *dev;
- int rv;
-
- dev = nvm_alloc_dev(0);
- if (!dev)
- return -ENOMEM;
-
- dev->q = nullb->q;
- memcpy(dev->name, nullb->disk_name, DISK_NAME_LEN);
- dev->ops = &null_lnvm_dev_ops;
-
- rv = nvm_register(dev);
- if (rv) {
- kfree(dev);
- return rv;
- }
- nullb->ndev = dev;
- return 0;
-}
-
-static void null_nvm_unregister(struct nullb *nullb)
-{
- nvm_unregister(nullb->ndev);
-}
-#else
-static int null_nvm_register(struct nullb *nullb)
-{
- pr_err("null_blk: CONFIG_NVM needs to be enabled for LightNVM\n");
- return -EINVAL;
-}
-static void null_nvm_unregister(struct nullb *nullb) {}
-#endif /* CONFIG_NVM */
-
static void null_del_dev(struct nullb *nullb)
{
struct nullb_device *dev = nullb->dev;
@@ -1592,10 +1417,7 @@ static void null_del_dev(struct nullb *nullb)
list_del_init(&nullb->list);
- if (dev->use_lightnvm)
- null_nvm_unregister(nullb);
- else
- del_gendisk(nullb->disk);
+ del_gendisk(nullb->disk);
if (test_bit(NULLB_DEV_FL_THROTTLED, &nullb->dev->flags)) {
hrtimer_cancel(&nullb->bw_timer);
@@ -1607,8 +1429,7 @@ static void null_del_dev(struct nullb *nullb)
if (dev->queue_mode == NULL_Q_MQ &&
nullb->tag_set == &nullb->__tag_set)
blk_mq_free_tag_set(nullb->tag_set);
- if (!dev->use_lightnvm)
- put_disk(nullb->disk);
+ put_disk(nullb->disk);
cleanup_queues(nullb);
if (null_cache_active(nullb))
null_free_device_storage(nullb->dev, true);
@@ -1772,11 +1593,6 @@ static void null_validate_conf(struct nullb_device *dev)
{
dev->blocksize = round_down(dev->blocksize, 512);
dev->blocksize = clamp_t(unsigned int, dev->blocksize, 512, 4096);
- if (dev->use_lightnvm && dev->blocksize != 4096)
- dev->blocksize = 4096;
-
- if (dev->use_lightnvm && dev->queue_mode != NULL_Q_MQ)
- dev->queue_mode = NULL_Q_MQ;
if (dev->queue_mode == NULL_Q_MQ && dev->use_per_node_hctx) {
if (dev->submit_queues != nr_online_nodes)
@@ -1892,11 +1708,7 @@ static int null_add_dev(struct nullb_device *dev)
sprintf(nullb->disk_name, "nullb%d", nullb->index);
- if (dev->use_lightnvm)
- rv = null_nvm_register(nullb);
- else
- rv = null_gendisk_register(nullb);
-
+ rv = null_gendisk_register(nullb);
if (rv)
goto out_cleanup_blk_queue;
@@ -1935,18 +1747,6 @@ static int __init null_init(void)
g_bs = PAGE_SIZE;
}
- if (g_use_lightnvm && g_bs != 4096) {
- pr_warn("null_blk: LightNVM only supports 4k block size\n");
- pr_warn("null_blk: defaults block size to 4k\n");
- g_bs = 4096;
- }
-
- if (g_use_lightnvm && g_queue_mode != NULL_Q_MQ) {
- pr_warn("null_blk: LightNVM only supported for blk-mq\n");
- pr_warn("null_blk: defaults queue mode to blk-mq\n");
- g_queue_mode = NULL_Q_MQ;
- }
-
if (g_queue_mode == NULL_Q_MQ && g_use_per_node_hctx) {
if (g_submit_queues != nr_online_nodes) {
pr_warn("null_blk: submit_queues param is set to %u.\n",
@@ -1979,16 +1779,6 @@ static int __init null_init(void)
goto err_conf;
}
- if (g_use_lightnvm) {
- ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64),
- 0, 0, NULL);
- if (!ppa_cache) {
- pr_err("null_blk: unable to create ppa cache\n");
- ret = -ENOMEM;
- goto err_ppa;
- }
- }
-
for (i = 0; i < nr_devices; i++) {
dev = null_alloc_dev();
if (!dev)
@@ -2010,8 +1800,6 @@ static int __init null_init(void)
null_del_dev(nullb);
null_free_dev(dev);
}
- kmem_cache_destroy(ppa_cache);
-err_ppa:
unregister_blkdev(null_major, "nullb");
err_conf:
configfs_unregister_subsystem(&nullb_subsys);
@@ -2042,8 +1830,6 @@ static void __exit null_exit(void)
if (g_queue_mode == NULL_Q_MQ && shared_tags)
blk_mq_free_tag_set(&tag_set);
-
- kmem_cache_destroy(ppa_cache);
}
module_init(null_init);
--
2.9.3