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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
ktime_set(S,N) was required for the timespec storage type and is still useful for situations where a Seconds and Nanoseconds part of a time value needs to be converted. For anything where the Seconds argument is 0, this is pointless and can be replaced with a simple assignment. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org>
889 lines
19 KiB
C
889 lines
19 KiB
C
#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/blk-mq.h>
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#include <linux/hrtimer.h>
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#include <linux/lightnvm.h>
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struct nullb_cmd {
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struct list_head list;
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struct llist_node ll_list;
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struct call_single_data csd;
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struct request *rq;
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struct bio *bio;
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unsigned int tag;
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struct nullb_queue *nq;
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struct hrtimer timer;
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};
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struct nullb_queue {
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unsigned long *tag_map;
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wait_queue_head_t wait;
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unsigned int queue_depth;
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struct nullb_cmd *cmds;
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};
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struct nullb {
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struct list_head list;
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unsigned int index;
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struct request_queue *q;
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struct gendisk *disk;
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struct nvm_dev *ndev;
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struct blk_mq_tag_set tag_set;
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struct hrtimer timer;
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unsigned int queue_depth;
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spinlock_t lock;
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struct nullb_queue *queues;
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unsigned int nr_queues;
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char disk_name[DISK_NAME_LEN];
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};
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static LIST_HEAD(nullb_list);
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static struct mutex lock;
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static int null_major;
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static int nullb_indexes;
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static struct kmem_cache *ppa_cache;
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enum {
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NULL_IRQ_NONE = 0,
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NULL_IRQ_SOFTIRQ = 1,
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NULL_IRQ_TIMER = 2,
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};
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enum {
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NULL_Q_BIO = 0,
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NULL_Q_RQ = 1,
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NULL_Q_MQ = 2,
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};
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static int submit_queues;
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module_param(submit_queues, int, S_IRUGO);
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MODULE_PARM_DESC(submit_queues, "Number of submission queues");
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static int home_node = NUMA_NO_NODE;
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module_param(home_node, int, S_IRUGO);
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MODULE_PARM_DESC(home_node, "Home node for the device");
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static int queue_mode = NULL_Q_MQ;
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static int null_param_store_val(const char *str, int *val, int min, int max)
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{
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int ret, new_val;
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ret = kstrtoint(str, 10, &new_val);
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if (ret)
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return -EINVAL;
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if (new_val < min || new_val > max)
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return -EINVAL;
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*val = new_val;
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return 0;
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}
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static int null_set_queue_mode(const char *str, const struct kernel_param *kp)
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{
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return null_param_store_val(str, &queue_mode, NULL_Q_BIO, NULL_Q_MQ);
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}
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static const struct kernel_param_ops null_queue_mode_param_ops = {
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.set = null_set_queue_mode,
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.get = param_get_int,
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};
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device_param_cb(queue_mode, &null_queue_mode_param_ops, &queue_mode, S_IRUGO);
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MODULE_PARM_DESC(queue_mode, "Block interface to use (0=bio,1=rq,2=multiqueue)");
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static int gb = 250;
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module_param(gb, int, S_IRUGO);
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MODULE_PARM_DESC(gb, "Size in GB");
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static int bs = 512;
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module_param(bs, int, S_IRUGO);
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MODULE_PARM_DESC(bs, "Block size (in bytes)");
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static int nr_devices = 2;
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module_param(nr_devices, int, S_IRUGO);
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MODULE_PARM_DESC(nr_devices, "Number of devices to register");
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static bool use_lightnvm;
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module_param(use_lightnvm, bool, S_IRUGO);
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MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device");
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static int irqmode = NULL_IRQ_SOFTIRQ;
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static int null_set_irqmode(const char *str, const struct kernel_param *kp)
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{
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return null_param_store_val(str, &irqmode, NULL_IRQ_NONE,
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NULL_IRQ_TIMER);
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}
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static const struct kernel_param_ops null_irqmode_param_ops = {
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.set = null_set_irqmode,
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.get = param_get_int,
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};
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device_param_cb(irqmode, &null_irqmode_param_ops, &irqmode, S_IRUGO);
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MODULE_PARM_DESC(irqmode, "IRQ completion handler. 0-none, 1-softirq, 2-timer");
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static unsigned long completion_nsec = 10000;
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module_param(completion_nsec, ulong, S_IRUGO);
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MODULE_PARM_DESC(completion_nsec, "Time in ns to complete a request in hardware. Default: 10,000ns");
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static int hw_queue_depth = 64;
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module_param(hw_queue_depth, int, S_IRUGO);
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MODULE_PARM_DESC(hw_queue_depth, "Queue depth for each hardware queue. Default: 64");
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static bool use_per_node_hctx = false;
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module_param(use_per_node_hctx, bool, S_IRUGO);
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MODULE_PARM_DESC(use_per_node_hctx, "Use per-node allocation for hardware context queues. Default: false");
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static void put_tag(struct nullb_queue *nq, unsigned int tag)
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{
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clear_bit_unlock(tag, nq->tag_map);
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if (waitqueue_active(&nq->wait))
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wake_up(&nq->wait);
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}
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static unsigned int get_tag(struct nullb_queue *nq)
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{
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unsigned int tag;
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do {
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tag = find_first_zero_bit(nq->tag_map, nq->queue_depth);
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if (tag >= nq->queue_depth)
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return -1U;
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} while (test_and_set_bit_lock(tag, nq->tag_map));
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return tag;
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}
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static void free_cmd(struct nullb_cmd *cmd)
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{
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put_tag(cmd->nq, cmd->tag);
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}
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static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer);
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static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq)
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{
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struct nullb_cmd *cmd;
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unsigned int tag;
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tag = get_tag(nq);
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if (tag != -1U) {
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cmd = &nq->cmds[tag];
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cmd->tag = tag;
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cmd->nq = nq;
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if (irqmode == NULL_IRQ_TIMER) {
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hrtimer_init(&cmd->timer, CLOCK_MONOTONIC,
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HRTIMER_MODE_REL);
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cmd->timer.function = null_cmd_timer_expired;
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}
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return cmd;
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}
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return NULL;
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}
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static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait)
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{
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struct nullb_cmd *cmd;
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DEFINE_WAIT(wait);
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cmd = __alloc_cmd(nq);
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if (cmd || !can_wait)
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return cmd;
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do {
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prepare_to_wait(&nq->wait, &wait, TASK_UNINTERRUPTIBLE);
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cmd = __alloc_cmd(nq);
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if (cmd)
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break;
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io_schedule();
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} while (1);
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finish_wait(&nq->wait, &wait);
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return cmd;
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}
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static void end_cmd(struct nullb_cmd *cmd)
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{
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struct request_queue *q = NULL;
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if (cmd->rq)
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q = cmd->rq->q;
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switch (queue_mode) {
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case NULL_Q_MQ:
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blk_mq_end_request(cmd->rq, 0);
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return;
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case NULL_Q_RQ:
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INIT_LIST_HEAD(&cmd->rq->queuelist);
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blk_end_request_all(cmd->rq, 0);
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break;
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case NULL_Q_BIO:
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bio_endio(cmd->bio);
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break;
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}
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free_cmd(cmd);
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/* Restart queue if needed, as we are freeing a tag */
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if (queue_mode == NULL_Q_RQ && blk_queue_stopped(q)) {
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unsigned long flags;
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spin_lock_irqsave(q->queue_lock, flags);
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blk_start_queue_async(q);
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spin_unlock_irqrestore(q->queue_lock, flags);
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}
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}
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static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer)
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{
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end_cmd(container_of(timer, struct nullb_cmd, timer));
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return HRTIMER_NORESTART;
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}
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static void null_cmd_end_timer(struct nullb_cmd *cmd)
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{
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ktime_t kt = completion_nsec;
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hrtimer_start(&cmd->timer, kt, HRTIMER_MODE_REL);
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}
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static void null_softirq_done_fn(struct request *rq)
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{
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if (queue_mode == NULL_Q_MQ)
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end_cmd(blk_mq_rq_to_pdu(rq));
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else
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end_cmd(rq->special);
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}
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static inline void null_handle_cmd(struct nullb_cmd *cmd)
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{
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/* Complete IO by inline, softirq or timer */
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switch (irqmode) {
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case NULL_IRQ_SOFTIRQ:
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switch (queue_mode) {
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case NULL_Q_MQ:
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blk_mq_complete_request(cmd->rq, cmd->rq->errors);
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break;
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case NULL_Q_RQ:
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blk_complete_request(cmd->rq);
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break;
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case NULL_Q_BIO:
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/*
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* XXX: no proper submitting cpu information available.
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*/
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end_cmd(cmd);
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break;
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}
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break;
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case NULL_IRQ_NONE:
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end_cmd(cmd);
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break;
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case NULL_IRQ_TIMER:
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null_cmd_end_timer(cmd);
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break;
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}
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}
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static struct nullb_queue *nullb_to_queue(struct nullb *nullb)
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{
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int index = 0;
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if (nullb->nr_queues != 1)
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index = raw_smp_processor_id() / ((nr_cpu_ids + nullb->nr_queues - 1) / nullb->nr_queues);
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return &nullb->queues[index];
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}
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static blk_qc_t null_queue_bio(struct request_queue *q, struct bio *bio)
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{
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struct nullb *nullb = q->queuedata;
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struct nullb_queue *nq = nullb_to_queue(nullb);
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struct nullb_cmd *cmd;
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cmd = alloc_cmd(nq, 1);
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cmd->bio = bio;
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null_handle_cmd(cmd);
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return BLK_QC_T_NONE;
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}
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static int null_rq_prep_fn(struct request_queue *q, struct request *req)
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{
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struct nullb *nullb = q->queuedata;
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struct nullb_queue *nq = nullb_to_queue(nullb);
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struct nullb_cmd *cmd;
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cmd = alloc_cmd(nq, 0);
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if (cmd) {
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cmd->rq = req;
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req->special = cmd;
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return BLKPREP_OK;
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}
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blk_stop_queue(q);
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return BLKPREP_DEFER;
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}
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static void null_request_fn(struct request_queue *q)
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{
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struct request *rq;
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while ((rq = blk_fetch_request(q)) != NULL) {
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struct nullb_cmd *cmd = rq->special;
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spin_unlock_irq(q->queue_lock);
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null_handle_cmd(cmd);
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spin_lock_irq(q->queue_lock);
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}
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}
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static int null_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *bd)
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{
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struct nullb_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);
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if (irqmode == NULL_IRQ_TIMER) {
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hrtimer_init(&cmd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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cmd->timer.function = null_cmd_timer_expired;
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}
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cmd->rq = bd->rq;
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cmd->nq = hctx->driver_data;
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blk_mq_start_request(bd->rq);
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null_handle_cmd(cmd);
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return BLK_MQ_RQ_QUEUE_OK;
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}
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static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq)
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{
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BUG_ON(!nullb);
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BUG_ON(!nq);
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init_waitqueue_head(&nq->wait);
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nq->queue_depth = nullb->queue_depth;
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}
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static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
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unsigned int index)
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{
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struct nullb *nullb = data;
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struct nullb_queue *nq = &nullb->queues[index];
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hctx->driver_data = nq;
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null_init_queue(nullb, nq);
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nullb->nr_queues++;
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return 0;
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}
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static struct blk_mq_ops null_mq_ops = {
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.queue_rq = null_queue_rq,
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.init_hctx = null_init_hctx,
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.complete = null_softirq_done_fn,
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};
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static void cleanup_queue(struct nullb_queue *nq)
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{
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kfree(nq->tag_map);
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kfree(nq->cmds);
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}
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static void cleanup_queues(struct nullb *nullb)
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{
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int i;
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for (i = 0; i < nullb->nr_queues; i++)
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cleanup_queue(&nullb->queues[i]);
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kfree(nullb->queues);
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}
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#ifdef CONFIG_NVM
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static void null_lnvm_end_io(struct request *rq, int error)
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{
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struct nvm_rq *rqd = rq->end_io_data;
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nvm_end_io(rqd, error);
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blk_put_request(rq);
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}
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static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
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{
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struct request_queue *q = dev->q;
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struct request *rq;
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struct bio *bio = rqd->bio;
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rq = blk_mq_alloc_request(q, bio_data_dir(bio), 0);
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if (IS_ERR(rq))
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return -ENOMEM;
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rq->cmd_type = REQ_TYPE_DRV_PRIV;
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rq->__sector = bio->bi_iter.bi_sector;
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rq->ioprio = bio_prio(bio);
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if (bio_has_data(bio))
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rq->nr_phys_segments = bio_phys_segments(q, bio);
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rq->__data_len = bio->bi_iter.bi_size;
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rq->bio = rq->biotail = bio;
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rq->end_io_data = rqd;
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blk_execute_rq_nowait(q, NULL, rq, 0, null_lnvm_end_io);
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return 0;
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}
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static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id)
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{
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sector_t size = gb * 1024 * 1024 * 1024ULL;
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sector_t blksize;
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struct nvm_id_group *grp;
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id->ver_id = 0x1;
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id->vmnt = 0;
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id->cgrps = 1;
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id->cap = 0x2;
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id->dom = 0x1;
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id->ppaf.blk_offset = 0;
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id->ppaf.blk_len = 16;
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id->ppaf.pg_offset = 16;
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id->ppaf.pg_len = 16;
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id->ppaf.sect_offset = 32;
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id->ppaf.sect_len = 8;
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id->ppaf.pln_offset = 40;
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id->ppaf.pln_len = 8;
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id->ppaf.lun_offset = 48;
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id->ppaf.lun_len = 8;
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id->ppaf.ch_offset = 56;
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id->ppaf.ch_len = 8;
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sector_div(size, bs); /* convert size to pages */
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size >>= 8; /* concert size to pgs pr blk */
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grp = &id->groups[0];
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grp->mtype = 0;
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grp->fmtype = 0;
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grp->num_ch = 1;
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grp->num_pg = 256;
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blksize = size;
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size >>= 16;
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grp->num_lun = size + 1;
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sector_div(blksize, grp->num_lun);
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grp->num_blk = blksize;
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grp->num_pln = 1;
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grp->fpg_sz = bs;
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grp->csecs = bs;
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grp->trdt = 25000;
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grp->trdm = 25000;
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grp->tprt = 500000;
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grp->tprm = 500000;
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grp->tbet = 1500000;
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grp->tbem = 1500000;
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grp->mpos = 0x010101; /* single plane rwe */
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grp->cpar = hw_queue_depth;
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return 0;
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}
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static void *null_lnvm_create_dma_pool(struct nvm_dev *dev, char *name)
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{
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mempool_t *virtmem_pool;
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virtmem_pool = mempool_create_slab_pool(64, ppa_cache);
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if (!virtmem_pool) {
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pr_err("null_blk: Unable to create virtual memory pool\n");
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return NULL;
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}
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return virtmem_pool;
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}
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static void null_lnvm_destroy_dma_pool(void *pool)
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{
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mempool_destroy(pool);
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}
|
|
|
|
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)
|
|
{
|
|
list_del_init(&nullb->list);
|
|
|
|
if (use_lightnvm)
|
|
null_nvm_unregister(nullb);
|
|
else
|
|
del_gendisk(nullb->disk);
|
|
blk_cleanup_queue(nullb->q);
|
|
if (queue_mode == NULL_Q_MQ)
|
|
blk_mq_free_tag_set(&nullb->tag_set);
|
|
if (!use_lightnvm)
|
|
put_disk(nullb->disk);
|
|
cleanup_queues(nullb);
|
|
kfree(nullb);
|
|
}
|
|
|
|
static int null_open(struct block_device *bdev, fmode_t mode)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void null_release(struct gendisk *disk, fmode_t mode)
|
|
{
|
|
}
|
|
|
|
static const struct block_device_operations null_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = null_open,
|
|
.release = null_release,
|
|
};
|
|
|
|
static int setup_commands(struct nullb_queue *nq)
|
|
{
|
|
struct nullb_cmd *cmd;
|
|
int i, tag_size;
|
|
|
|
nq->cmds = kzalloc(nq->queue_depth * sizeof(*cmd), GFP_KERNEL);
|
|
if (!nq->cmds)
|
|
return -ENOMEM;
|
|
|
|
tag_size = ALIGN(nq->queue_depth, BITS_PER_LONG) / BITS_PER_LONG;
|
|
nq->tag_map = kzalloc(tag_size * sizeof(unsigned long), GFP_KERNEL);
|
|
if (!nq->tag_map) {
|
|
kfree(nq->cmds);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < nq->queue_depth; i++) {
|
|
cmd = &nq->cmds[i];
|
|
INIT_LIST_HEAD(&cmd->list);
|
|
cmd->ll_list.next = NULL;
|
|
cmd->tag = -1U;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_queues(struct nullb *nullb)
|
|
{
|
|
nullb->queues = kzalloc(submit_queues * sizeof(struct nullb_queue),
|
|
GFP_KERNEL);
|
|
if (!nullb->queues)
|
|
return -ENOMEM;
|
|
|
|
nullb->nr_queues = 0;
|
|
nullb->queue_depth = hw_queue_depth;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int init_driver_queues(struct nullb *nullb)
|
|
{
|
|
struct nullb_queue *nq;
|
|
int i, ret = 0;
|
|
|
|
for (i = 0; i < submit_queues; i++) {
|
|
nq = &nullb->queues[i];
|
|
|
|
null_init_queue(nullb, nq);
|
|
|
|
ret = setup_commands(nq);
|
|
if (ret)
|
|
return ret;
|
|
nullb->nr_queues++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int null_gendisk_register(struct nullb *nullb)
|
|
{
|
|
struct gendisk *disk;
|
|
sector_t size;
|
|
|
|
disk = nullb->disk = alloc_disk_node(1, home_node);
|
|
if (!disk)
|
|
return -ENOMEM;
|
|
size = gb * 1024 * 1024 * 1024ULL;
|
|
set_capacity(disk, size >> 9);
|
|
|
|
disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
|
|
disk->major = null_major;
|
|
disk->first_minor = nullb->index;
|
|
disk->fops = &null_fops;
|
|
disk->private_data = nullb;
|
|
disk->queue = nullb->q;
|
|
strncpy(disk->disk_name, nullb->disk_name, DISK_NAME_LEN);
|
|
|
|
add_disk(disk);
|
|
return 0;
|
|
}
|
|
|
|
static int null_add_dev(void)
|
|
{
|
|
struct nullb *nullb;
|
|
int rv;
|
|
|
|
nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, home_node);
|
|
if (!nullb) {
|
|
rv = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock_init(&nullb->lock);
|
|
|
|
if (queue_mode == NULL_Q_MQ && use_per_node_hctx)
|
|
submit_queues = nr_online_nodes;
|
|
|
|
rv = setup_queues(nullb);
|
|
if (rv)
|
|
goto out_free_nullb;
|
|
|
|
if (queue_mode == NULL_Q_MQ) {
|
|
nullb->tag_set.ops = &null_mq_ops;
|
|
nullb->tag_set.nr_hw_queues = submit_queues;
|
|
nullb->tag_set.queue_depth = hw_queue_depth;
|
|
nullb->tag_set.numa_node = home_node;
|
|
nullb->tag_set.cmd_size = sizeof(struct nullb_cmd);
|
|
nullb->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
|
|
nullb->tag_set.driver_data = nullb;
|
|
|
|
rv = blk_mq_alloc_tag_set(&nullb->tag_set);
|
|
if (rv)
|
|
goto out_cleanup_queues;
|
|
|
|
nullb->q = blk_mq_init_queue(&nullb->tag_set);
|
|
if (IS_ERR(nullb->q)) {
|
|
rv = -ENOMEM;
|
|
goto out_cleanup_tags;
|
|
}
|
|
} else if (queue_mode == NULL_Q_BIO) {
|
|
nullb->q = blk_alloc_queue_node(GFP_KERNEL, home_node);
|
|
if (!nullb->q) {
|
|
rv = -ENOMEM;
|
|
goto out_cleanup_queues;
|
|
}
|
|
blk_queue_make_request(nullb->q, null_queue_bio);
|
|
rv = init_driver_queues(nullb);
|
|
if (rv)
|
|
goto out_cleanup_blk_queue;
|
|
} else {
|
|
nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
|
|
if (!nullb->q) {
|
|
rv = -ENOMEM;
|
|
goto out_cleanup_queues;
|
|
}
|
|
blk_queue_prep_rq(nullb->q, null_rq_prep_fn);
|
|
blk_queue_softirq_done(nullb->q, null_softirq_done_fn);
|
|
rv = init_driver_queues(nullb);
|
|
if (rv)
|
|
goto out_cleanup_blk_queue;
|
|
}
|
|
|
|
nullb->q->queuedata = nullb;
|
|
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, nullb->q);
|
|
queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, nullb->q);
|
|
|
|
mutex_lock(&lock);
|
|
nullb->index = nullb_indexes++;
|
|
mutex_unlock(&lock);
|
|
|
|
blk_queue_logical_block_size(nullb->q, bs);
|
|
blk_queue_physical_block_size(nullb->q, bs);
|
|
|
|
sprintf(nullb->disk_name, "nullb%d", nullb->index);
|
|
|
|
if (use_lightnvm)
|
|
rv = null_nvm_register(nullb);
|
|
else
|
|
rv = null_gendisk_register(nullb);
|
|
|
|
if (rv)
|
|
goto out_cleanup_blk_queue;
|
|
|
|
mutex_lock(&lock);
|
|
list_add_tail(&nullb->list, &nullb_list);
|
|
mutex_unlock(&lock);
|
|
|
|
return 0;
|
|
out_cleanup_blk_queue:
|
|
blk_cleanup_queue(nullb->q);
|
|
out_cleanup_tags:
|
|
if (queue_mode == NULL_Q_MQ)
|
|
blk_mq_free_tag_set(&nullb->tag_set);
|
|
out_cleanup_queues:
|
|
cleanup_queues(nullb);
|
|
out_free_nullb:
|
|
kfree(nullb);
|
|
out:
|
|
return rv;
|
|
}
|
|
|
|
static int __init null_init(void)
|
|
{
|
|
int ret = 0;
|
|
unsigned int i;
|
|
struct nullb *nullb;
|
|
|
|
if (bs > PAGE_SIZE) {
|
|
pr_warn("null_blk: invalid block size\n");
|
|
pr_warn("null_blk: defaults block size to %lu\n", PAGE_SIZE);
|
|
bs = PAGE_SIZE;
|
|
}
|
|
|
|
if (use_lightnvm && bs != 4096) {
|
|
pr_warn("null_blk: LightNVM only supports 4k block size\n");
|
|
pr_warn("null_blk: defaults block size to 4k\n");
|
|
bs = 4096;
|
|
}
|
|
|
|
if (use_lightnvm && 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");
|
|
queue_mode = NULL_Q_MQ;
|
|
}
|
|
|
|
if (queue_mode == NULL_Q_MQ && use_per_node_hctx) {
|
|
if (submit_queues < nr_online_nodes) {
|
|
pr_warn("null_blk: submit_queues param is set to %u.",
|
|
nr_online_nodes);
|
|
submit_queues = nr_online_nodes;
|
|
}
|
|
} else if (submit_queues > nr_cpu_ids)
|
|
submit_queues = nr_cpu_ids;
|
|
else if (!submit_queues)
|
|
submit_queues = 1;
|
|
|
|
mutex_init(&lock);
|
|
|
|
null_major = register_blkdev(0, "nullb");
|
|
if (null_major < 0)
|
|
return null_major;
|
|
|
|
if (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++) {
|
|
ret = null_add_dev();
|
|
if (ret)
|
|
goto err_dev;
|
|
}
|
|
|
|
pr_info("null: module loaded\n");
|
|
return 0;
|
|
|
|
err_dev:
|
|
while (!list_empty(&nullb_list)) {
|
|
nullb = list_entry(nullb_list.next, struct nullb, list);
|
|
null_del_dev(nullb);
|
|
}
|
|
kmem_cache_destroy(ppa_cache);
|
|
err_ppa:
|
|
unregister_blkdev(null_major, "nullb");
|
|
return ret;
|
|
}
|
|
|
|
static void __exit null_exit(void)
|
|
{
|
|
struct nullb *nullb;
|
|
|
|
unregister_blkdev(null_major, "nullb");
|
|
|
|
mutex_lock(&lock);
|
|
while (!list_empty(&nullb_list)) {
|
|
nullb = list_entry(nullb_list.next, struct nullb, list);
|
|
null_del_dev(nullb);
|
|
}
|
|
mutex_unlock(&lock);
|
|
|
|
kmem_cache_destroy(ppa_cache);
|
|
}
|
|
|
|
module_init(null_init);
|
|
module_exit(null_exit);
|
|
|
|
MODULE_AUTHOR("Jens Axboe <jaxboe@fusionio.com>");
|
|
MODULE_LICENSE("GPL");
|