From 1cf7a12e09aa48512404bf3f0f429b73182ce793 Mon Sep 17 00:00:00 2001 From: Chaitanya Kulkarni Date: Tue, 22 Sep 2020 14:05:29 -0700 Subject: nvme: use an xarray to lookup the Commands Supported and Effects log When using linked list we have to open code the locking, search, and destroy operations with the loops even if data structure doesn't fall into the fast path. One of the main advantage of having XArray to store, search, and remove items is that it handles all the locking by itself, avoids the loops when using linked lists, provides clear API to replace the linked list's search and destroy loops. This patch replaces the ctrl->cel list with XArray and removes :- a. Extra code needed for the linked list for ctrl->cel item management such as nvme_find_cel(). b. Destroy loop in the nvme_free_ctrl(). c. Explicit insertion locking in the nvme_get_effects_log(). Signed-off-by: Chaitanya Kulkarni Reviewed-by: Keith Busch Signed-off-by: Christoph Hellwig --- drivers/nvme/host/core.c | 31 ++++--------------------------- drivers/nvme/host/nvme.h | 2 +- 2 files changed, 5 insertions(+), 28 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 35cd177bda08..0a985c601c62 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3025,26 +3025,10 @@ int nvme_get_log(struct nvme_ctrl *ctrl, u32 nsid, u8 log_page, u8 lsp, u8 csi, return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size); } -static struct nvme_cel *nvme_find_cel(struct nvme_ctrl *ctrl, u8 csi) -{ - struct nvme_cel *cel, *ret = NULL; - - spin_lock_irq(&ctrl->lock); - list_for_each_entry(cel, &ctrl->cels, entry) { - if (cel->csi == csi) { - ret = cel; - break; - } - } - spin_unlock_irq(&ctrl->lock); - - return ret; -} - static int nvme_get_effects_log(struct nvme_ctrl *ctrl, u8 csi, struct nvme_effects_log **log) { - struct nvme_cel *cel = nvme_find_cel(ctrl, csi); + struct nvme_cel *cel = xa_load(&ctrl->cels, csi); int ret; if (cel) @@ -3062,10 +3046,7 @@ static int nvme_get_effects_log(struct nvme_ctrl *ctrl, u8 csi, } cel->csi = csi; - - spin_lock_irq(&ctrl->lock); - list_add_tail(&cel->entry, &ctrl->cels); - spin_unlock_irq(&ctrl->lock); + xa_store(&ctrl->cels, cel->csi, cel, GFP_KERNEL); out: *log = &cel->log; return 0; @@ -4448,15 +4429,11 @@ static void nvme_free_ctrl(struct device *dev) struct nvme_ctrl *ctrl = container_of(dev, struct nvme_ctrl, ctrl_device); struct nvme_subsystem *subsys = ctrl->subsys; - struct nvme_cel *cel, *next; if (!subsys || ctrl->instance != subsys->instance) ida_simple_remove(&nvme_instance_ida, ctrl->instance); - list_for_each_entry_safe(cel, next, &ctrl->cels, entry) { - list_del(&cel->entry); - kfree(cel); - } + xa_destroy(&ctrl->cels); nvme_mpath_uninit(ctrl); __free_page(ctrl->discard_page); @@ -4488,7 +4465,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, spin_lock_init(&ctrl->lock); mutex_init(&ctrl->scan_lock); INIT_LIST_HEAD(&ctrl->namespaces); - INIT_LIST_HEAD(&ctrl->cels); + xa_init(&ctrl->cels); init_rwsem(&ctrl->namespaces_rwsem); ctrl->dev = dev; ctrl->ops = ops; diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 4749baa457bc..1096ef1f6aa2 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -300,7 +300,7 @@ struct nvme_ctrl { unsigned long quirks; struct nvme_id_power_state psd[32]; struct nvme_effects_log *effects; - struct list_head cels; + struct xarray cels; struct work_struct scan_work; struct work_struct async_event_work; struct delayed_work ka_work; -- cgit v1.2.3