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Date: Tue, 18 Nov 2014 20:41:59 +0100
From: Matias Bjørling <m@...rling.me>
To: hch@...radead.org, axboe@...com, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: thornber@...hat.com, bvanassche@....org, jmad@....dk,
Matias Bjørling <m@...rling.me>
Subject: [RFC PATCH 5/5] null_blk: LightNVM integration
Allows the null_blk driver to hook into LightNVM for performance
evaluation.
It is activated by passing lightnvm_enable parameter at module load.
The number of channels exposed to LightNVM can be configured
through the lightnvm_num_channels module parameter.
Contributions in this patch from:
Jesper Madsen <jmad@....dk>
Signed-off-by: Matias Bjørling <m@...rling.me>
---
Documentation/block/null_blk.txt | 8 ++++
drivers/block/null_blk.c | 89 +++++++++++++++++++++++++++++++++++++---
2 files changed, 92 insertions(+), 5 deletions(-)
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt
index b2830b4..a35e928 100644
--- a/Documentation/block/null_blk.txt
+++ b/Documentation/block/null_blk.txt
@@ -70,3 +70,11 @@ use_per_node_hctx=[0/1]: Default: 0
parameter.
1: The multi-queue block layer is instantiated with a hardware dispatch
queue for each CPU node in the system.
+
+IV: LightNVM specific parameters
+
+lightnvm_enable=[x]: Default: 0
+ Enable LightNVM for null block devices. Requires blk-mq to be used.
+
+lightnvm_num_channels=[x]: Default: 1
+ Number of LightNVM channels that are exposed to the LightNVM driver.
diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
index 00d469c..4462941 100644
--- a/drivers/block/null_blk.c
+++ b/drivers/block/null_blk.c
@@ -7,6 +7,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/blk-mq.h>
+#include <linux/lightnvm.h>
#include <linux/hrtimer.h>
struct nullb_cmd {
@@ -109,6 +110,14 @@ static bool use_per_node_hctx = false;
module_param(use_per_node_hctx, bool, S_IRUGO);
MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false");
+static bool lightnvm_enable = false;
+module_param(lightnvm_enable, bool, S_IRUGO);
+MODULE_PARM_DESC(lightnvm_enable, "Enable LightNVM. Default: false");
+
+static int lightnvm_num_channels = 1;
+module_param(lightnvm_num_channels, int, S_IRUGO);
+MODULE_PARM_DESC(lightnvm_num_channels, "Number of channels to be exposed to LightNVM. Default: 1");
+
static void put_tag(struct nullb_queue *nq, unsigned int tag)
{
clear_bit_unlock(tag, nq->tag_map);
@@ -313,6 +322,55 @@ static void null_request_fn(struct request_queue *q)
}
}
+static int null_nvm_id(struct request_queue *q, struct nvm_id *id)
+{
+ sector_t size = gb * 1024 * 1024 * 1024ULL;
+ unsigned long per_chnl_size =
+ size / bs / lightnvm_num_channels;
+ struct nvm_id_chnl *chnl;
+ int i;
+
+ id->ver_id = 0x1;
+ id->nvm_type = NVM_NVMT_BLK;
+ id->nchannels = lightnvm_num_channels;
+
+ id->chnls = kmalloc(sizeof(struct nvm_id_chnl) * id->nchannels,
+ GFP_KERNEL);
+ if (!id->chnls)
+ return -ENOMEM;
+
+ for (i = 0; i < id->nchannels; i++) {
+ chnl = &id->chnls[i];
+ chnl->queue_size = hw_queue_depth;
+ chnl->gran_read = bs;
+ chnl->gran_write = bs;
+ chnl->gran_erase = bs * 256;
+ chnl->oob_size = 0;
+ chnl->t_r = chnl->t_sqr = 25000; /* 25us */
+ chnl->t_w = chnl->t_sqw = 500000; /* 500us */
+ chnl->t_e = 1500000; /* 1.500us */
+ chnl->io_sched = NVM_IOSCHED_CHANNEL;
+ chnl->laddr_begin = per_chnl_size * i;
+ chnl->laddr_end = per_chnl_size * (i + 1) - 1;
+ }
+
+ return 0;
+}
+
+static int null_nvm_get_features(struct request_queue *q,
+ struct nvm_get_features *gf)
+{
+ gf->rsp[0] = (1 << NVM_RSP_L2P);
+ gf->rsp[0] |= (1 << NVM_RSP_P2L);
+ gf->rsp[0] |= (1 << NVM_RSP_GC);
+ return 0;
+}
+
+static int null_nvm_set_rsp(struct request_queue *q, u8 rsp, u8 val)
+{
+ return NVM_RID_NOT_CHANGEABLE | NVM_DNR;
+}
+
static int null_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *rq)
{
struct nullb_cmd *cmd = blk_mq_rq_to_pdu(rq);
@@ -346,6 +404,12 @@ static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
return 0;
}
+static struct lightnvm_dev_ops null_nvm_dev_ops = {
+ .identify = null_nvm_id,
+ .get_features = null_nvm_get_features,
+ .set_responsibility = null_nvm_set_rsp,
+};
+
static struct blk_mq_ops null_mq_ops = {
.queue_rq = null_queue_rq,
.map_queue = blk_mq_map_queue,
@@ -488,6 +552,11 @@ static int null_add_dev(void)
nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
nullb->tag_set.driver_data = nullb;
+ if (lightnvm_enable) {
+ nullb->tag_set.flags &= ~BLK_MQ_F_SHOULD_MERGE;
+ nullb->tag_set.flags |= BLK_MQ_F_LIGHTNVM;
+ }
+
rv = blk_mq_alloc_tag_set(&nullb->tag_set);
if (rv)
goto out_cleanup_queues;
@@ -525,11 +594,6 @@ static int null_add_dev(void)
goto out_cleanup_blk_queue;
}
- mutex_lock(&lock);
- list_add_tail(&nullb->list, &nullb_list);
- nullb->index = nullb_indexes++;
- mutex_unlock(&lock);
-
blk_queue_logical_block_size(nullb->q, bs);
blk_queue_physical_block_size(nullb->q, bs);
@@ -543,10 +607,25 @@ static int null_add_dev(void)
disk->fops = &null_fops;
disk->private_data = nullb;
disk->queue = nullb->q;
+
+ if (lightnvm_enable && queue_mode == NULL_Q_MQ) {
+ if (blk_lightnvm_register(nullb->q, &null_nvm_dev_ops))
+ goto out_cleanup_nvm;
+
+ nullb->q->nvm->drv_cmd_size = sizeof(struct nullb_cmd);
+ }
+
+ mutex_lock(&lock);
+ list_add_tail(&nullb->list, &nullb_list);
+ nullb->index = nullb_indexes++;
+ mutex_unlock(&lock);
+
sprintf(disk->disk_name, "nullb%d", nullb->index);
add_disk(disk);
return 0;
+out_cleanup_nvm:
+ put_disk(disk);
out_cleanup_blk_queue:
blk_cleanup_queue(nullb->q);
out_cleanup_tags:
--
1.9.1
--
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