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nullb: factor disk parameters
When we switch to configfs interface, each disk could have different configuration. To prepare for the change, we move most disk setting to a separate data structure. The existing module parameter interface is kept. The 'nr_devices' and 'shared_tags' don't make sense for per-disk setting, so they are remained as global settings. Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li
Jens Axboe
parent
92d499d490
commit
2984c8684f
@ -25,11 +25,29 @@ 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_device *dev;
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struct nullb_cmd *cmds;
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};
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struct nullb_device {
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struct nullb *nullb;
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unsigned long size; /* device size in MB */
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unsigned long completion_nsec; /* time in ns to complete a request */
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unsigned int submit_queues; /* number of submission queues */
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unsigned int home_node; /* home node for the device */
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unsigned int queue_mode; /* block interface */
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unsigned int blocksize; /* block size */
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unsigned int irqmode; /* IRQ completion handler */
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unsigned int hw_queue_depth; /* queue depth */
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bool use_lightnvm; /* register as a LightNVM device */
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bool blocking; /* blocking blk-mq device */
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bool use_per_node_hctx; /* use per-node allocation for hardware context */
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};
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struct nullb {
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struct nullb_device *dev;
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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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@ -65,15 +83,15 @@ enum {
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NULL_Q_MQ = 2,
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};
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static int submit_queues = 1;
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module_param(submit_queues, int, S_IRUGO);
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static int g_submit_queues = 1;
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module_param_named(submit_queues, g_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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static int g_home_node = NUMA_NO_NODE;
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module_param_named(home_node, g_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 g_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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@ -92,7 +110,7 @@ static int null_param_store_val(const char *str, int *val, int min, int max)
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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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return null_param_store_val(str, &g_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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@ -100,38 +118,38 @@ static const struct kernel_param_ops null_queue_mode_param_ops = {
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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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device_param_cb(queue_mode, &null_queue_mode_param_ops, &g_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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static int g_gb = 250;
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module_param_named(gb, g_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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static int g_bs = 512;
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module_param_named(bs, g_bs, int, S_IRUGO);
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MODULE_PARM_DESC(bs, "Block size (in bytes)");
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static int nr_devices = 1;
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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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static bool g_use_lightnvm;
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module_param_named(use_lightnvm, g_use_lightnvm, bool, S_IRUGO);
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MODULE_PARM_DESC(use_lightnvm, "Register as a LightNVM device");
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static bool blocking;
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module_param(blocking, bool, S_IRUGO);
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static bool g_blocking;
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module_param_named(blocking, g_blocking, bool, S_IRUGO);
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MODULE_PARM_DESC(blocking, "Register as a blocking blk-mq driver device");
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static bool shared_tags;
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module_param(shared_tags, bool, S_IRUGO);
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MODULE_PARM_DESC(shared_tags, "Share tag set between devices for blk-mq");
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static int irqmode = NULL_IRQ_SOFTIRQ;
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static int g_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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return null_param_store_val(str, &g_irqmode, NULL_IRQ_NONE,
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NULL_IRQ_TIMER);
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}
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@ -140,21 +158,47 @@ static const struct kernel_param_ops null_irqmode_param_ops = {
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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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device_param_cb(irqmode, &null_irqmode_param_ops, &g_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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static unsigned long g_completion_nsec = 10000;
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module_param_named(completion_nsec, g_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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static int g_hw_queue_depth = 64;
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module_param_named(hw_queue_depth, g_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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static bool g_use_per_node_hctx;
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module_param_named(use_per_node_hctx, g_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 struct nullb_device *null_alloc_dev(void)
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{
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struct nullb_device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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dev->size = g_gb * 1024;
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dev->completion_nsec = g_completion_nsec;
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dev->submit_queues = g_submit_queues;
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dev->home_node = g_home_node;
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dev->queue_mode = g_queue_mode;
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dev->blocksize = g_bs;
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dev->irqmode = g_irqmode;
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dev->hw_queue_depth = g_hw_queue_depth;
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dev->use_lightnvm = g_use_lightnvm;
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dev->blocking = g_blocking;
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dev->use_per_node_hctx = g_use_per_node_hctx;
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return dev;
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}
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static void null_free_dev(struct nullb_device *dev)
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{
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kfree(dev);
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}
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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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@ -193,7 +237,7 @@ static struct nullb_cmd *__alloc_cmd(struct nullb_queue *nq)
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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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if (nq->dev->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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@ -229,6 +273,7 @@ static struct nullb_cmd *alloc_cmd(struct nullb_queue *nq, int can_wait)
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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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int queue_mode = cmd->nq->dev->queue_mode;
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if (cmd->rq)
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q = cmd->rq->q;
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@ -267,14 +312,16 @@ static enum hrtimer_restart null_cmd_timer_expired(struct hrtimer *timer)
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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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ktime_t kt = cmd->nq->dev->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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struct nullb *nullb = rq->q->queuedata;
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if (nullb->dev->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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@ -283,9 +330,9 @@ static void null_softirq_done_fn(struct request *rq)
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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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switch (cmd->nq->dev->irqmode) {
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case NULL_IRQ_SOFTIRQ:
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switch (queue_mode) {
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switch (cmd->nq->dev->queue_mode) {
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case NULL_Q_MQ:
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blk_mq_complete_request(cmd->rq);
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break;
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@ -366,15 +413,16 @@ static blk_status_t 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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struct nullb_queue *nq = hctx->driver_data;
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might_sleep_if(hctx->flags & BLK_MQ_F_BLOCKING);
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if (irqmode == NULL_IRQ_TIMER) {
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if (nq->dev->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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cmd->nq = nq;
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blk_mq_start_request(bd->rq);
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@ -438,7 +486,8 @@ static int null_lnvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
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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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struct nullb *nullb = dev->q->queuedata;
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sector_t size = (sector_t)nullb->dev->size * 1024 * 1024ULL;
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sector_t blksize;
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struct nvm_id_group *grp;
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@ -460,7 +509,7 @@ static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id)
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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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sector_div(size, nullb->dev->blocksize); /* convert size to pages */
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size >>= 8; /* concert size to pgs pr blk */
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grp = &id->grp;
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grp->mtype = 0;
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@ -474,8 +523,8 @@ static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id)
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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->fpg_sz = nullb->dev->blocksize;
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grp->csecs = nullb->dev->blocksize;
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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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@ -483,7 +532,7 @@ static int null_lnvm_id(struct nvm_dev *dev, struct nvm_id *id)
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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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grp->cpar = nullb->dev->hw_queue_depth;
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return 0;
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}
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@ -568,19 +617,23 @@ static void null_nvm_unregister(struct nullb *nullb) {}
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static void null_del_dev(struct nullb *nullb)
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{
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struct nullb_device *dev = nullb->dev;
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list_del_init(&nullb->list);
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if (use_lightnvm)
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if (dev->use_lightnvm)
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null_nvm_unregister(nullb);
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else
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del_gendisk(nullb->disk);
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blk_cleanup_queue(nullb->q);
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if (queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
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if (dev->queue_mode == NULL_Q_MQ &&
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nullb->tag_set == &nullb->__tag_set)
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blk_mq_free_tag_set(nullb->tag_set);
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if (!use_lightnvm)
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if (!dev->use_lightnvm)
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put_disk(nullb->disk);
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cleanup_queues(nullb);
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kfree(nullb);
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dev->nullb = NULL;
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}
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static int null_open(struct block_device *bdev, fmode_t mode)
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@ -605,6 +658,7 @@ static void null_init_queue(struct nullb *nullb, struct nullb_queue *nq)
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init_waitqueue_head(&nq->wait);
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nq->queue_depth = nullb->queue_depth;
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nq->dev = nullb->dev;
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}
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static void null_init_queues(struct nullb *nullb)
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@ -652,13 +706,13 @@ static int setup_commands(struct nullb_queue *nq)
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static int setup_queues(struct nullb *nullb)
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{
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nullb->queues = kzalloc(submit_queues * sizeof(struct nullb_queue),
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GFP_KERNEL);
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nullb->queues = kzalloc(nullb->dev->submit_queues *
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sizeof(struct nullb_queue), GFP_KERNEL);
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if (!nullb->queues)
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return -ENOMEM;
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nullb->nr_queues = 0;
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nullb->queue_depth = hw_queue_depth;
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nullb->queue_depth = nullb->dev->hw_queue_depth;
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return 0;
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}
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@ -668,7 +722,7 @@ static int init_driver_queues(struct nullb *nullb)
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struct nullb_queue *nq;
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int i, ret = 0;
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for (i = 0; i < submit_queues; i++) {
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for (i = 0; i < nullb->dev->submit_queues; i++) {
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nq = &nullb->queues[i];
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null_init_queue(nullb, nq);
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@ -686,10 +740,10 @@ static int null_gendisk_register(struct nullb *nullb)
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struct gendisk *disk;
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sector_t size;
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disk = nullb->disk = alloc_disk_node(1, home_node);
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disk = nullb->disk = alloc_disk_node(1, nullb->dev->home_node);
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if (!disk)
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return -ENOMEM;
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size = gb * 1024 * 1024 * 1024ULL;
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size = (sector_t)nullb->dev->size * 1024 * 1024ULL;
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set_capacity(disk, size >> 9);
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disk->flags |= GENHD_FL_EXT_DEVT | GENHD_FL_SUPPRESS_PARTITION_INFO;
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@ -704,32 +758,36 @@ static int null_gendisk_register(struct nullb *nullb)
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return 0;
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}
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static int null_init_tag_set(struct blk_mq_tag_set *set)
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static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
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{
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set->ops = &null_mq_ops;
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set->nr_hw_queues = submit_queues;
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set->queue_depth = hw_queue_depth;
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set->numa_node = home_node;
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set->nr_hw_queues = nullb ? nullb->dev->submit_queues :
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g_submit_queues;
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set->queue_depth = nullb ? nullb->dev->hw_queue_depth :
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g_hw_queue_depth;
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set->numa_node = nullb ? nullb->dev->home_node : g_home_node;
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set->cmd_size = sizeof(struct nullb_cmd);
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set->flags = BLK_MQ_F_SHOULD_MERGE;
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set->driver_data = NULL;
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if (blocking)
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if (nullb->dev->blocking)
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set->flags |= BLK_MQ_F_BLOCKING;
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return blk_mq_alloc_tag_set(set);
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}
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static int null_add_dev(void)
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static int null_add_dev(struct nullb_device *dev)
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{
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struct nullb *nullb;
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int rv;
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nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, home_node);
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nullb = kzalloc_node(sizeof(*nullb), GFP_KERNEL, dev->home_node);
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if (!nullb) {
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rv = -ENOMEM;
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goto out;
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}
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nullb->dev = dev;
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dev->nullb = nullb;
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spin_lock_init(&nullb->lock);
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@ -737,13 +795,13 @@ static int null_add_dev(void)
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if (rv)
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goto out_free_nullb;
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if (queue_mode == NULL_Q_MQ) {
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if (dev->queue_mode == NULL_Q_MQ) {
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if (shared_tags) {
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nullb->tag_set = &tag_set;
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rv = 0;
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} else {
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nullb->tag_set = &nullb->__tag_set;
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rv = null_init_tag_set(nullb->tag_set);
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rv = null_init_tag_set(nullb, nullb->tag_set);
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||||
}
|
||||
|
||||
if (rv)
|
||||
@ -755,8 +813,8 @@ static int null_add_dev(void)
|
||||
goto out_cleanup_tags;
|
||||
}
|
||||
null_init_queues(nullb);
|
||||
} else if (queue_mode == NULL_Q_BIO) {
|
||||
nullb->q = blk_alloc_queue_node(GFP_KERNEL, home_node);
|
||||
} else if (dev->queue_mode == NULL_Q_BIO) {
|
||||
nullb->q = blk_alloc_queue_node(GFP_KERNEL, dev->home_node);
|
||||
if (!nullb->q) {
|
||||
rv = -ENOMEM;
|
||||
goto out_cleanup_queues;
|
||||
@ -766,7 +824,8 @@ static int null_add_dev(void)
|
||||
if (rv)
|
||||
goto out_cleanup_blk_queue;
|
||||
} else {
|
||||
nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock, home_node);
|
||||
nullb->q = blk_init_queue_node(null_request_fn, &nullb->lock,
|
||||
dev->home_node);
|
||||
if (!nullb->q) {
|
||||
rv = -ENOMEM;
|
||||
goto out_cleanup_queues;
|
||||
@ -786,12 +845,12 @@ static int null_add_dev(void)
|
||||
nullb->index = nullb_indexes++;
|
||||
mutex_unlock(&lock);
|
||||
|
||||
blk_queue_logical_block_size(nullb->q, bs);
|
||||
blk_queue_physical_block_size(nullb->q, bs);
|
||||
blk_queue_logical_block_size(nullb->q, dev->blocksize);
|
||||
blk_queue_physical_block_size(nullb->q, dev->blocksize);
|
||||
|
||||
sprintf(nullb->disk_name, "nullb%d", nullb->index);
|
||||
|
||||
if (use_lightnvm)
|
||||
if (dev->use_lightnvm)
|
||||
rv = null_nvm_register(nullb);
|
||||
else
|
||||
rv = null_gendisk_register(nullb);
|
||||
@ -807,13 +866,14 @@ static int null_add_dev(void)
|
||||
out_cleanup_blk_queue:
|
||||
blk_cleanup_queue(nullb->q);
|
||||
out_cleanup_tags:
|
||||
if (queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
|
||||
if (dev->queue_mode == NULL_Q_MQ && nullb->tag_set == &nullb->__tag_set)
|
||||
blk_mq_free_tag_set(nullb->tag_set);
|
||||
out_cleanup_queues:
|
||||
cleanup_queues(nullb);
|
||||
out_free_nullb:
|
||||
kfree(nullb);
|
||||
out:
|
||||
null_free_dev(dev);
|
||||
return rv;
|
||||
}
|
||||
|
||||
@ -822,38 +882,39 @@ static int __init null_init(void)
|
||||
int ret = 0;
|
||||
unsigned int i;
|
||||
struct nullb *nullb;
|
||||
struct nullb_device *dev;
|
||||
|
||||
if (bs > PAGE_SIZE) {
|
||||
if (g_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;
|
||||
g_bs = PAGE_SIZE;
|
||||
}
|
||||
|
||||
if (use_lightnvm && bs != 4096) {
|
||||
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");
|
||||
bs = 4096;
|
||||
g_bs = 4096;
|
||||
}
|
||||
|
||||
if (use_lightnvm && queue_mode != NULL_Q_MQ) {
|
||||
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");
|
||||
queue_mode = NULL_Q_MQ;
|
||||
g_queue_mode = NULL_Q_MQ;
|
||||
}
|
||||
|
||||
if (queue_mode == NULL_Q_MQ && use_per_node_hctx) {
|
||||
if (submit_queues != nr_online_nodes) {
|
||||
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",
|
||||
nr_online_nodes);
|
||||
submit_queues = nr_online_nodes;
|
||||
g_submit_queues = nr_online_nodes;
|
||||
}
|
||||
} else if (submit_queues > nr_cpu_ids)
|
||||
submit_queues = nr_cpu_ids;
|
||||
else if (submit_queues <= 0)
|
||||
submit_queues = 1;
|
||||
} else if (g_submit_queues > nr_cpu_ids)
|
||||
g_submit_queues = nr_cpu_ids;
|
||||
else if (g_submit_queues <= 0)
|
||||
g_submit_queues = 1;
|
||||
|
||||
if (queue_mode == NULL_Q_MQ && shared_tags) {
|
||||
ret = null_init_tag_set(&tag_set);
|
||||
if (g_queue_mode == NULL_Q_MQ && shared_tags) {
|
||||
ret = null_init_tag_set(NULL, &tag_set);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
@ -866,7 +927,7 @@ static int __init null_init(void)
|
||||
goto err_tagset;
|
||||
}
|
||||
|
||||
if (use_lightnvm) {
|
||||
if (g_use_lightnvm) {
|
||||
ppa_cache = kmem_cache_create("ppa_cache", 64 * sizeof(u64),
|
||||
0, 0, NULL);
|
||||
if (!ppa_cache) {
|
||||
@ -877,9 +938,14 @@ static int __init null_init(void)
|
||||
}
|
||||
|
||||
for (i = 0; i < nr_devices; i++) {
|
||||
ret = null_add_dev();
|
||||
if (ret)
|
||||
dev = null_alloc_dev();
|
||||
if (!dev)
|
||||
goto err_dev;
|
||||
ret = null_add_dev(dev);
|
||||
if (ret) {
|
||||
null_free_dev(dev);
|
||||
goto err_dev;
|
||||
}
|
||||
}
|
||||
|
||||
pr_info("null: module loaded\n");
|
||||
@ -888,13 +954,15 @@ static int __init null_init(void)
|
||||
err_dev:
|
||||
while (!list_empty(&nullb_list)) {
|
||||
nullb = list_entry(nullb_list.next, struct nullb, list);
|
||||
dev = nullb->dev;
|
||||
null_del_dev(nullb);
|
||||
null_free_dev(dev);
|
||||
}
|
||||
kmem_cache_destroy(ppa_cache);
|
||||
err_ppa:
|
||||
unregister_blkdev(null_major, "nullb");
|
||||
err_tagset:
|
||||
if (queue_mode == NULL_Q_MQ && shared_tags)
|
||||
if (g_queue_mode == NULL_Q_MQ && shared_tags)
|
||||
blk_mq_free_tag_set(&tag_set);
|
||||
return ret;
|
||||
}
|
||||
@ -907,12 +975,16 @@ static void __exit null_exit(void)
|
||||
|
||||
mutex_lock(&lock);
|
||||
while (!list_empty(&nullb_list)) {
|
||||
struct nullb_device *dev;
|
||||
|
||||
nullb = list_entry(nullb_list.next, struct nullb, list);
|
||||
dev = nullb->dev;
|
||||
null_del_dev(nullb);
|
||||
null_free_dev(dev);
|
||||
}
|
||||
mutex_unlock(&lock);
|
||||
|
||||
if (queue_mode == NULL_Q_MQ && shared_tags)
|
||||
if (g_queue_mode == NULL_Q_MQ && shared_tags)
|
||||
blk_mq_free_tag_set(&tag_set);
|
||||
|
||||
kmem_cache_destroy(ppa_cache);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user