Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 620 insertions, 0 deletions

diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
new file mode 100644
index 000000000..ef162b64f
--- /dev/null
+++ b/drivers/nvme/target/nvmet.h
@@ -0,0 +1,620 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2015-2016 HGST, a Western Digital Company.
+ */
+
+#ifndef _NVMET_H
+#define _NVMET_H
+
+#include <linux/dma-mapping.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/kref.h>
+#include <linux/percpu-refcount.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/uuid.h>
+#include <linux/nvme.h>
+#include <linux/configfs.h>
+#include <linux/rcupdate.h>
+#include <linux/blkdev.h>
+#include <linux/radix-tree.h>
+#include <linux/t10-pi.h>
+
+#define NVMET_DEFAULT_VS		NVME_VS(1, 3, 0)
+
+#define NVMET_ASYNC_EVENTS		4
+#define NVMET_ERROR_LOG_SLOTS		128
+#define NVMET_NO_ERROR_LOC		((u16)-1)
+#define NVMET_DEFAULT_CTRL_MODEL	"Linux"
+
+/*
+ * Supported optional AENs:
+ */
+#define NVMET_AEN_CFG_OPTIONAL \
+	(NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_ANA_CHANGE)
+#define NVMET_DISC_AEN_CFG_OPTIONAL \
+	(NVME_AEN_CFG_DISC_CHANGE)
+
+/*
+ * Plus mandatory SMART AENs (we'll never send them, but allow enabling them):
+ */
+#define NVMET_AEN_CFG_ALL \
+	(NVME_SMART_CRIT_SPARE | NVME_SMART_CRIT_TEMPERATURE | \
+	 NVME_SMART_CRIT_RELIABILITY | NVME_SMART_CRIT_MEDIA | \
+	 NVME_SMART_CRIT_VOLATILE_MEMORY | NVMET_AEN_CFG_OPTIONAL)
+
+/* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM
+ * The 16 bit shift is to set IATTR bit to 1, which means offending
+ * offset starts in the data section of connect()
+ */
+#define IPO_IATTR_CONNECT_DATA(x)	\
+	(cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x))))
+#define IPO_IATTR_CONNECT_SQE(x)	\
+	(cpu_to_le32(offsetof(struct nvmf_connect_command, x)))
+
+struct nvmet_ns {
+	struct percpu_ref	ref;
+	struct block_device	*bdev;
+	struct file		*file;
+	bool			readonly;
+	u32			nsid;
+	u32			blksize_shift;
+	loff_t			size;
+	u8			nguid[16];
+	uuid_t			uuid;
+	u32			anagrpid;
+
+	bool			buffered_io;
+	bool			enabled;
+	struct nvmet_subsys	*subsys;
+	const char		*device_path;
+
+	struct config_group	device_group;
+	struct config_group	group;
+
+	struct completion	disable_done;
+	mempool_t		*bvec_pool;
+	struct kmem_cache	*bvec_cache;
+
+	int			use_p2pmem;
+	struct pci_dev		*p2p_dev;
+	int			pi_type;
+	int			metadata_size;
+};
+
+static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct nvmet_ns, group);
+}
+
+static inline struct device *nvmet_ns_dev(struct nvmet_ns *ns)
+{
+	return ns->bdev ? disk_to_dev(ns->bdev->bd_disk) : NULL;
+}
+
+struct nvmet_cq {
+	u16			qid;
+	u16			size;
+};
+
+struct nvmet_sq {
+	struct nvmet_ctrl	*ctrl;
+	struct percpu_ref	ref;
+	u16			qid;
+	u16			size;
+	u32			sqhd;
+	bool			sqhd_disabled;
+	struct completion	free_done;
+	struct completion	confirm_done;
+};
+
+struct nvmet_ana_group {
+	struct config_group	group;
+	struct nvmet_port	*port;
+	u32			grpid;
+};
+
+static inline struct nvmet_ana_group *to_ana_group(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct nvmet_ana_group,
+			group);
+}
+
+/**
+ * struct nvmet_port -	Common structure to keep port
+ *				information for the target.
+ * @entry:		Entry into referrals or transport list.
+ * @disc_addr:		Address information is stored in a format defined
+ *				for a discovery log page entry.
+ * @group:		ConfigFS group for this element's folder.
+ * @priv:		Private data for the transport.
+ */
+struct nvmet_port {
+	struct list_head		entry;
+	struct nvmf_disc_rsp_page_entry	disc_addr;
+	struct config_group		group;
+	struct config_group		subsys_group;
+	struct list_head		subsystems;
+	struct config_group		referrals_group;
+	struct list_head		referrals;
+	struct list_head		global_entry;
+	struct config_group		ana_groups_group;
+	struct nvmet_ana_group		ana_default_group;
+	enum nvme_ana_state		*ana_state;
+	void				*priv;
+	bool				enabled;
+	int				inline_data_size;
+	const struct nvmet_fabrics_ops	*tr_ops;
+	bool				pi_enable;
+};
+
+static inline struct nvmet_port *to_nvmet_port(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct nvmet_port,
+			group);
+}
+
+static inline struct nvmet_port *ana_groups_to_port(
+		struct config_item *item)
+{
+	return container_of(to_config_group(item), struct nvmet_port,
+			ana_groups_group);
+}
+
+struct nvmet_ctrl {
+	struct nvmet_subsys	*subsys;
+	struct nvmet_sq		**sqs;
+
+	bool			reset_tbkas;
+
+	struct mutex		lock;
+	u64			cap;
+	u32			cc;
+	u32			csts;
+
+	uuid_t			hostid;
+	u16			cntlid;
+	u32			kato;
+
+	struct nvmet_port	*port;
+
+	u32			aen_enabled;
+	unsigned long		aen_masked;
+	struct nvmet_req	*async_event_cmds[NVMET_ASYNC_EVENTS];
+	unsigned int		nr_async_event_cmds;
+	struct list_head	async_events;
+	struct work_struct	async_event_work;
+
+	struct list_head	subsys_entry;
+	struct kref		ref;
+	struct delayed_work	ka_work;
+	struct work_struct	fatal_err_work;
+
+	const struct nvmet_fabrics_ops *ops;
+
+	__le32			*changed_ns_list;
+	u32			nr_changed_ns;
+
+	char			subsysnqn[NVMF_NQN_FIELD_LEN];
+	char			hostnqn[NVMF_NQN_FIELD_LEN];
+
+	struct device		*p2p_client;
+	struct radix_tree_root	p2p_ns_map;
+
+	spinlock_t		error_lock;
+	u64			err_counter;
+	struct nvme_error_slot	slots[NVMET_ERROR_LOG_SLOTS];
+	bool			pi_support;
+};
+
+struct nvmet_subsys_model {
+	struct rcu_head		rcuhead;
+	char			number[];
+};
+
+struct nvmet_subsys {
+	enum nvme_subsys_type	type;
+
+	struct mutex		lock;
+	struct kref		ref;
+
+	struct xarray		namespaces;
+	unsigned int		nr_namespaces;
+	unsigned int		max_nsid;
+	u16			cntlid_min;
+	u16			cntlid_max;
+
+	struct list_head	ctrls;
+
+	struct list_head	hosts;
+	bool			allow_any_host;
+
+	u16			max_qid;
+
+	u64			ver;
+	u64			serial;
+	char			*subsysnqn;
+	bool			pi_support;
+
+	struct config_group	group;
+
+	struct config_group	namespaces_group;
+	struct config_group	allowed_hosts_group;
+
+	struct nvmet_subsys_model	__rcu *model;
+
+#ifdef CONFIG_NVME_TARGET_PASSTHRU
+	struct nvme_ctrl	*passthru_ctrl;
+	char			*passthru_ctrl_path;
+	struct config_group	passthru_group;
+#endif /* CONFIG_NVME_TARGET_PASSTHRU */
+};
+
+static inline struct nvmet_subsys *to_subsys(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct nvmet_subsys, group);
+}
+
+static inline struct nvmet_subsys *namespaces_to_subsys(
+		struct config_item *item)
+{
+	return container_of(to_config_group(item), struct nvmet_subsys,
+			namespaces_group);
+}
+
+struct nvmet_host {
+	struct config_group	group;
+};
+
+static inline struct nvmet_host *to_host(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct nvmet_host, group);
+}
+
+static inline char *nvmet_host_name(struct nvmet_host *host)
+{
+	return config_item_name(&host->group.cg_item);
+}
+
+struct nvmet_host_link {
+	struct list_head	entry;
+	struct nvmet_host	*host;
+};
+
+struct nvmet_subsys_link {
+	struct list_head	entry;
+	struct nvmet_subsys	*subsys;
+};
+
+struct nvmet_req;
+struct nvmet_fabrics_ops {
+	struct module *owner;
+	unsigned int type;
+	unsigned int msdbd;
+	unsigned int flags;
+#define NVMF_KEYED_SGLS			(1 << 0)
+#define NVMF_METADATA_SUPPORTED		(1 << 1)
+	void (*queue_response)(struct nvmet_req *req);
+	int (*add_port)(struct nvmet_port *port);
+	void (*remove_port)(struct nvmet_port *port);
+	void (*delete_ctrl)(struct nvmet_ctrl *ctrl);
+	void (*disc_traddr)(struct nvmet_req *req,
+			struct nvmet_port *port, char *traddr);
+	u16 (*install_queue)(struct nvmet_sq *nvme_sq);
+	void (*discovery_chg)(struct nvmet_port *port);
+	u8 (*get_mdts)(const struct nvmet_ctrl *ctrl);
+};
+
+#define NVMET_MAX_INLINE_BIOVEC	8
+#define NVMET_MAX_INLINE_DATA_LEN NVMET_MAX_INLINE_BIOVEC * PAGE_SIZE
+
+struct nvmet_req {
+	struct nvme_command	*cmd;
+	struct nvme_completion	*cqe;
+	struct nvmet_sq		*sq;
+	struct nvmet_cq		*cq;
+	struct nvmet_ns		*ns;
+	struct scatterlist	*sg;
+	struct scatterlist	*metadata_sg;
+	struct bio_vec		inline_bvec[NVMET_MAX_INLINE_BIOVEC];
+	union {
+		struct {
+			struct bio      inline_bio;
+		} b;
+		struct {
+			bool			mpool_alloc;
+			struct kiocb            iocb;
+			struct bio_vec          *bvec;
+			struct work_struct      work;
+		} f;
+		struct {
+			struct request		*rq;
+			struct work_struct      work;
+			bool			use_workqueue;
+		} p;
+	};
+	int			sg_cnt;
+	int			metadata_sg_cnt;
+	/* data length as parsed from the SGL descriptor: */
+	size_t			transfer_len;
+	size_t			metadata_len;
+
+	struct nvmet_port	*port;
+
+	void (*execute)(struct nvmet_req *req);
+	const struct nvmet_fabrics_ops *ops;
+
+	struct pci_dev		*p2p_dev;
+	struct device		*p2p_client;
+	u16			error_loc;
+	u64			error_slba;
+};
+
+extern struct workqueue_struct *buffered_io_wq;
+
+static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
+{
+	req->cqe->result.u32 = cpu_to_le32(result);
+}
+
+/*
+ * NVMe command writes actually are DMA reads for us on the target side.
+ */
+static inline enum dma_data_direction
+nvmet_data_dir(struct nvmet_req *req)
+{
+	return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
+}
+
+struct nvmet_async_event {
+	struct list_head	entry;
+	u8			event_type;
+	u8			event_info;
+	u8			log_page;
+};
+
+static inline void nvmet_clear_aen_bit(struct nvmet_req *req, u32 bn)
+{
+	int rae = le32_to_cpu(req->cmd->common.cdw10) & 1 << 15;
+
+	if (!rae)
+		clear_bit(bn, &req->sq->ctrl->aen_masked);
+}
+
+static inline bool nvmet_aen_bit_disabled(struct nvmet_ctrl *ctrl, u32 bn)
+{
+	if (!(READ_ONCE(ctrl->aen_enabled) & (1 << bn)))
+		return true;
+	return test_and_set_bit(bn, &ctrl->aen_masked);
+}
+
+void nvmet_get_feat_kato(struct nvmet_req *req);
+void nvmet_get_feat_async_event(struct nvmet_req *req);
+u16 nvmet_set_feat_kato(struct nvmet_req *req);
+u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask);
+void nvmet_execute_async_event(struct nvmet_req *req);
+void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl);
+void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl);
+
+u16 nvmet_parse_connect_cmd(struct nvmet_req *req);
+void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id);
+u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req);
+u16 nvmet_file_parse_io_cmd(struct nvmet_req *req);
+u16 nvmet_parse_admin_cmd(struct nvmet_req *req);
+u16 nvmet_parse_discovery_cmd(struct nvmet_req *req);
+u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req);
+
+bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
+		struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops);
+void nvmet_req_uninit(struct nvmet_req *req);
+bool nvmet_check_transfer_len(struct nvmet_req *req, size_t len);
+bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len);
+void nvmet_req_complete(struct nvmet_req *req, u16 status);
+int nvmet_req_alloc_sgls(struct nvmet_req *req);
+void nvmet_req_free_sgls(struct nvmet_req *req);
+
+void nvmet_execute_set_features(struct nvmet_req *req);
+void nvmet_execute_get_features(struct nvmet_req *req);
+void nvmet_execute_keep_alive(struct nvmet_req *req);
+
+void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
+		u16 size);
+void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid,
+		u16 size);
+void nvmet_sq_destroy(struct nvmet_sq *sq);
+int nvmet_sq_init(struct nvmet_sq *sq);
+
+void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl);
+
+void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new);
+u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
+		struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp);
+struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn,
+				       const char *hostnqn, u16 cntlid,
+				       struct nvmet_req *req);
+void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);
+u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd);
+
+struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
+		enum nvme_subsys_type type);
+void nvmet_subsys_put(struct nvmet_subsys *subsys);
+void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys);
+
+struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid);
+void nvmet_put_namespace(struct nvmet_ns *ns);
+int nvmet_ns_enable(struct nvmet_ns *ns);
+void nvmet_ns_disable(struct nvmet_ns *ns);
+struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid);
+void nvmet_ns_free(struct nvmet_ns *ns);
+
+void nvmet_send_ana_event(struct nvmet_subsys *subsys,
+		struct nvmet_port *port);
+void nvmet_port_send_ana_event(struct nvmet_port *port);
+
+int nvmet_register_transport(const struct nvmet_fabrics_ops *ops);
+void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops);
+
+void nvmet_port_del_ctrls(struct nvmet_port *port,
+			  struct nvmet_subsys *subsys);
+
+int nvmet_enable_port(struct nvmet_port *port);
+void nvmet_disable_port(struct nvmet_port *port);
+
+void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port);
+void nvmet_referral_disable(struct nvmet_port *parent, struct nvmet_port *port);
+
+u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
+		size_t len);
+u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
+		size_t len);
+u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len);
+
+u32 nvmet_get_log_page_len(struct nvme_command *cmd);
+u64 nvmet_get_log_page_offset(struct nvme_command *cmd);
+
+extern struct list_head *nvmet_ports;
+void nvmet_port_disc_changed(struct nvmet_port *port,
+		struct nvmet_subsys *subsys);
+void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys,
+		struct nvmet_host *host);
+void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
+		u8 event_info, u8 log_page);
+
+#define NVMET_QUEUE_SIZE	1024
+#define NVMET_NR_QUEUES		128
+#define NVMET_MAX_CMD		NVMET_QUEUE_SIZE
+
+/*
+ * Nice round number that makes a list of nsids fit into a page.
+ * Should become tunable at some point in the future.
+ */
+#define NVMET_MAX_NAMESPACES	1024
+
+/*
+ * 0 is not a valid ANA group ID, so we start numbering at 1.
+ *
+ * ANA Group 1 exists without manual intervention, has namespaces assigned to it
+ * by default, and is available in an optimized state through all ports.
+ */
+#define NVMET_MAX_ANAGRPS	128
+#define NVMET_DEFAULT_ANA_GRPID	1
+
+#define NVMET_KAS		10
+#define NVMET_DISC_KATO_MS		120000
+
+int __init nvmet_init_configfs(void);
+void __exit nvmet_exit_configfs(void);
+
+int __init nvmet_init_discovery(void);
+void nvmet_exit_discovery(void);
+
+extern struct nvmet_subsys *nvmet_disc_subsys;
+extern struct rw_semaphore nvmet_config_sem;
+
+extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1];
+extern u64 nvmet_ana_chgcnt;
+extern struct rw_semaphore nvmet_ana_sem;
+
+bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn);
+
+int nvmet_bdev_ns_enable(struct nvmet_ns *ns);
+int nvmet_file_ns_enable(struct nvmet_ns *ns);
+void nvmet_bdev_ns_disable(struct nvmet_ns *ns);
+void nvmet_file_ns_disable(struct nvmet_ns *ns);
+u16 nvmet_bdev_flush(struct nvmet_req *req);
+u16 nvmet_file_flush(struct nvmet_req *req);
+void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid);
+void nvmet_bdev_ns_revalidate(struct nvmet_ns *ns);
+int nvmet_file_ns_revalidate(struct nvmet_ns *ns);
+void nvmet_ns_revalidate(struct nvmet_ns *ns);
+
+static inline u32 nvmet_rw_data_len(struct nvmet_req *req)
+{
+	return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
+			req->ns->blksize_shift;
+}
+
+static inline u32 nvmet_rw_metadata_len(struct nvmet_req *req)
+{
+	if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
+		return 0;
+	return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) *
+			req->ns->metadata_size;
+}
+
+static inline u32 nvmet_dsm_len(struct nvmet_req *req)
+{
+	return (le32_to_cpu(req->cmd->dsm.nr) + 1) *
+		sizeof(struct nvme_dsm_range);
+}
+
+#ifdef CONFIG_NVME_TARGET_PASSTHRU
+void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys);
+int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys);
+void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys);
+u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req);
+u16 nvmet_parse_passthru_io_cmd(struct nvmet_req *req);
+static inline struct nvme_ctrl *nvmet_passthru_ctrl(struct nvmet_subsys *subsys)
+{
+	return subsys->passthru_ctrl;
+}
+#else /* CONFIG_NVME_TARGET_PASSTHRU */
+static inline void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys)
+{
+}
+static inline void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys)
+{
+}
+static inline u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req)
+{
+	return 0;
+}
+static inline u16 nvmet_parse_passthru_io_cmd(struct nvmet_req *req)
+{
+	return 0;
+}
+static inline struct nvme_ctrl *nvmet_passthru_ctrl(struct nvmet_subsys *subsys)
+{
+	return NULL;
+}
+#endif /* CONFIG_NVME_TARGET_PASSTHRU */
+
+static inline struct nvme_ctrl *
+nvmet_req_passthru_ctrl(struct nvmet_req *req)
+{
+	return nvmet_passthru_ctrl(req->sq->ctrl->subsys);
+}
+
+u16 errno_to_nvme_status(struct nvmet_req *req, int errno);
+
+/* Convert a 32-bit number to a 16-bit 0's based number */
+static inline __le16 to0based(u32 a)
+{
+	return cpu_to_le16(max(1U, min(1U << 16, a)) - 1);
+}
+
+static inline bool nvmet_ns_has_pi(struct nvmet_ns *ns)
+{
+	if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
+		return false;
+	return ns->pi_type && ns->metadata_size == sizeof(struct t10_pi_tuple);
+}
+
+static inline __le64 nvmet_sect_to_lba(struct nvmet_ns *ns, sector_t sect)
+{
+	return cpu_to_le64(sect >> (ns->blksize_shift - SECTOR_SHIFT));
+}
+
+static inline sector_t nvmet_lba_to_sect(struct nvmet_ns *ns, __le64 lba)
+{
+	return le64_to_cpu(lba) << (ns->blksize_shift - SECTOR_SHIFT);
+}
+
+static inline bool nvmet_use_inline_bvec(struct nvmet_req *req)
+{
+	return req->transfer_len <= NVMET_MAX_INLINE_DATA_LEN &&
+	       req->sg_cnt <= NVMET_MAX_INLINE_BIOVEC;
+}
+
+#endif /* _NVMET_H */