linux-kernel - [PATCH v8 02/13] nvme-core: export existing ctrl and ns interfaces

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Date:   Wed, 28 Aug 2019 15:54:18 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v8 02/13] nvme-core: export existing ctrl and ns interfaces

From: Chaitanya Kulkarni <chaitanya.kulkarni@....com>

We export existing nvme ctrl and ns management APIs so that target
passthru code can manage the nvme ctrl.

This is a preparation patch for implementing NVMe Over Fabric target
passthru feature.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/nvme/host/core.c | 17 +++++++++++------
 drivers/nvme/host/nvme.h |  7 +++++++
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 776eff8c5ba7..fabf60deda52 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -412,10 +412,11 @@ static void nvme_free_ns(struct kref *kref)
 	kfree(ns);
 }
 
-static void nvme_put_ns(struct nvme_ns *ns)
+void nvme_put_ns(struct nvme_ns *ns)
 {
 	kref_put(&ns->kref, nvme_free_ns);
 }
+EXPORT_SYMBOL_GPL(nvme_put_ns);
 
 static inline void nvme_clear_nvme_request(struct request *req)
 {
@@ -1088,7 +1089,7 @@ static int nvme_identify_ns_list(struct nvme_ctrl *dev, unsigned nsid, __le32 *n
 				    NVME_IDENTIFY_DATA_SIZE);
 }
 
-static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
+struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
 		unsigned nsid)
 {
 	struct nvme_id_ns *id;
@@ -1113,6 +1114,7 @@ static struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
 
 	return id;
 }
+EXPORT_SYMBOL_GPL(nvme_identify_ns);
 
 static int nvme_features(struct nvme_ctrl *dev, u8 op, unsigned int fid,
 		unsigned int dword11, void *buffer, size_t buflen, u32 *result)
@@ -1261,8 +1263,8 @@ static u32 nvme_known_admin_effects(u8 opcode)
 	return 0;
 }
 
-static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
-								u8 opcode)
+u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+		u8 opcode)
 {
 	u32 effects = 0;
 
@@ -1294,6 +1296,7 @@ static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	}
 	return effects;
 }
+EXPORT_SYMBOL_GPL(nvme_passthru_start);
 
 static void nvme_update_formats(struct nvme_ctrl *ctrl)
 {
@@ -1308,7 +1311,7 @@ static void nvme_update_formats(struct nvme_ctrl *ctrl)
 	nvme_remove_invalid_namespaces(ctrl, NVME_NSID_ALL);
 }
 
-static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
+void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
 {
 	/*
 	 * Revalidate LBA changes prior to unfreezing. This is necessary to
@@ -1328,6 +1331,7 @@ static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
 	if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC))
 		nvme_queue_scan(ctrl);
 }
+EXPORT_SYMBOL_GPL(nvme_passthru_end);
 
 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 			struct nvme_passthru_cmd __user *ucmd)
@@ -3282,7 +3286,7 @@ static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
 	return nsa->head->ns_id - nsb->head->ns_id;
 }
 
-static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
+struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 {
 	struct nvme_ns *ns, *ret = NULL;
 
@@ -3300,6 +3304,7 @@ static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	up_read(&ctrl->namespaces_rwsem);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(nvme_find_get_ns);
 
 static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns)
 {
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 42d59445ae6b..e309b7977d82 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -441,6 +441,8 @@ void nvme_start_ctrl(struct nvme_ctrl *ctrl);
 void nvme_stop_ctrl(struct nvme_ctrl *ctrl);
 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 int nvme_init_identify(struct nvme_ctrl *ctrl);
+struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned int nsid);
+void nvme_put_ns(struct nvme_ns *ns);
 
 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);
 
@@ -477,8 +479,13 @@ int nvme_set_features(struct nvme_ctrl *dev, unsigned int fid,
 int nvme_get_features(struct nvme_ctrl *dev, unsigned int fid,
 		      unsigned int dword11, void *buffer, size_t buflen,
 		      u32 *result);
+u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
+		u8 opcode);
+void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects);
 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);
 void nvme_stop_keep_alive(struct nvme_ctrl *ctrl);
+struct nvme_id_ns *nvme_identify_ns(struct nvme_ctrl *ctrl,
+		unsigned int nsid);
 int nvme_reset_ctrl(struct nvme_ctrl *ctrl);
 int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl);
 int nvme_delete_ctrl(struct nvme_ctrl *ctrl);
-- 
2.20.1