drivers/nvme/host/nvme.h - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2011-2014, Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  */

 #ifndef _NVME_H
 #define _NVME_H

 #include <linux/nvme.h>
 #include <linux/pci.h>
 #include <linux/kref.h>
 #include <linux/blk-mq.h>

 enum {
 	/*
 	 * Driver internal status code for commands that were cancelled due
 	 * to timeouts or controller shutdown.  The value is negative so
 	 * that it a) doesn't overlap with the unsigned hardware error codes,
 	 * and b) can easily be tested for.
 	 */
 	NVME_SC_CANCELLED		= -EINTR,
 };

 extern unsigned char nvme_io_timeout;
 #define NVME_IO_TIMEOUT	(nvme_io_timeout * HZ)

 extern unsigned char admin_timeout;
 #define ADMIN_TIMEOUT	(admin_timeout * HZ)

 extern unsigned char shutdown_timeout;
 #define SHUTDOWN_TIMEOUT	(shutdown_timeout * HZ)

 enum {
 	NVME_NS_LBA		= 0,
 	NVME_NS_LIGHTNVM	= 1,
 };

 /*
  * List of workarounds for devices that required behavior not specified in
  * the standard.
  */
 enum nvme_quirks {
 	/*
 	 * Prefers I/O aligned to a stripe size specified in a vendor
 	 * specific Identify field.
 	 */
 	NVME_QUIRK_STRIPE_SIZE			= (1 << 0),

 	/*
 	 * The controller doesn't handle Identify value others than 0 or 1
 	 * correctly.
 	 */
 	NVME_QUIRK_IDENTIFY_CNS			= (1 << 1),

 	/*
 	 * The controller deterministically returns O's on reads to discarded
 	 * logical blocks.
 	 */
 	NVME_QUIRK_DISCARD_ZEROES		= (1 << 2),
 };

 struct nvme_ctrl {
 	const struct nvme_ctrl_ops *ops;
 	struct request_queue *admin_q;
 	struct device *dev;
 	struct kref kref;
 	int instance;
 	struct blk_mq_tag_set *tagset;
 	struct list_head namespaces;
 	struct mutex namespaces_mutex;
 	struct device *device;	/* char device */
 	struct list_head node;
 	struct ida ns_ida;

 	char name[12];
 	char serial[20];
 	char model[40];
 	char firmware_rev[8];
 	int cntlid;

 	u32 ctrl_config;

 	u32 page_size;
 	u32 max_hw_sectors;
 	u32 stripe_size;
 	u16 oncs;
 	u16 vid;
 	atomic_t abort_limit;
 	u8 event_limit;
 	u8 vwc;
 	u32 vs;
 	bool subsystem;
 	unsigned long quirks;
 };

 /*
  * An NVM Express namespace is equivalent to a SCSI LUN
  */
 struct nvme_ns {
 	struct list_head list;

 	struct nvme_ctrl *ctrl;
 	struct request_queue *queue;
 	struct gendisk *disk;
 	struct kref kref;
 	int instance;

 	u8 eui[8];
 	u8 uuid[16];

 	unsigned ns_id;
 	int lba_shift;
 	u16 ms;
 	bool ext;
 	u8 pi_type;
 	int type;
 	unsigned long flags;

 #define NVME_NS_REMOVING 0
 #define NVME_NS_DEAD     1

 	u64 mode_select_num_blocks;
 	u32 mode_select_block_len;
 };

 struct nvme_ctrl_ops {
 	struct module *module;
 	int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
 	int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
 	int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val);
 	bool (*io_incapable)(struct nvme_ctrl *ctrl);
 	int (*reset_ctrl)(struct nvme_ctrl *ctrl);
 	void (*free_ctrl)(struct nvme_ctrl *ctrl);
 };

 static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
 {
 	u32 val = 0;

 	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 		return false;
 	return val & NVME_CSTS_RDY;
 }

 static inline bool nvme_io_incapable(struct nvme_ctrl *ctrl)
 {
 	u32 val = 0;

 	if (ctrl->ops->io_incapable(ctrl))
 		return true;
 	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
 		return true;
 	return val & NVME_CSTS_CFS;
 }

 static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
 {
 	if (!ctrl->subsystem)
 		return -ENOTTY;
 	return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
 }

 static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
 {
 	return (sector >> (ns->lba_shift - 9));
 }

 static inline void nvme_setup_flush(struct nvme_ns *ns,
 		struct nvme_command *cmnd)
 {
 	memset(cmnd, 0, sizeof(*cmnd));
 	cmnd->common.opcode = nvme_cmd_flush;
 	cmnd->common.nsid = cpu_to_le32(ns->ns_id);
 }

 static inline void nvme_setup_rw(struct nvme_ns *ns, struct request *req,
 		struct nvme_command *cmnd)
 {
 	u16 control = 0;
 	u32 dsmgmt = 0;

 	if (req->cmd_flags & REQ_FUA)
 		control |= NVME_RW_FUA;
 	if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
 		control |= NVME_RW_LR;

 	if (req->cmd_flags & REQ_RAHEAD)
 		dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;

 	memset(cmnd, 0, sizeof(*cmnd));
 	cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
 	cmnd->rw.command_id = req->tag;
 	cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
 	cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
 	cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);

 	if (ns->ms) {
 		switch (ns->pi_type) {
 		case NVME_NS_DPS_PI_TYPE3:
 			control |= NVME_RW_PRINFO_PRCHK_GUARD;
 			break;
 		case NVME_NS_DPS_PI_TYPE1:
 		case NVME_NS_DPS_PI_TYPE2:
 			control |= NVME_RW_PRINFO_PRCHK_GUARD |
 					NVME_RW_PRINFO_PRCHK_REF;
 			cmnd->rw.reftag = cpu_to_le32(
 					nvme_block_nr(ns, blk_rq_pos(req)));
 			break;
 		}
 		if (!blk_integrity_rq(req))
 			control |= NVME_RW_PRINFO_PRACT;
 	}

 	cmnd->rw.control = cpu_to_le16(control);
 	cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
 }


 static inline int nvme_error_status(u16 status)
 {
 	switch (status & 0x7ff) {
 	case NVME_SC_SUCCESS:
 		return 0;
 	case NVME_SC_CAP_EXCEEDED:
 		return -ENOSPC;
 	default:
 		return -EIO;
 	}
 }

 static inline bool nvme_req_needs_retry(struct request *req, u16 status)
 {
 	return !(status & NVME_SC_DNR || blk_noretry_request(req)) &&
 		(jiffies - req->start_time) < req->timeout;
 }

 int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
 int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
 int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 		const struct nvme_ctrl_ops *ops, unsigned long quirks);
 void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
 void nvme_put_ctrl(struct nvme_ctrl *ctrl);
 int nvme_init_identify(struct nvme_ctrl *ctrl);

 void nvme_scan_namespaces(struct nvme_ctrl *ctrl);
 void nvme_remove_namespaces(struct nvme_ctrl *ctrl);

 void nvme_stop_queues(struct nvme_ctrl *ctrl);
 void nvme_start_queues(struct nvme_ctrl *ctrl);
 void nvme_kill_queues(struct nvme_ctrl *ctrl);

 struct request *nvme_alloc_request(struct request_queue *q,
 		struct nvme_command *cmd, unsigned int flags);
 void nvme_requeue_req(struct request *req);
 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 		void *buf, unsigned bufflen);
 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
 		struct nvme_completion *cqe, void *buffer, unsigned bufflen,
 		unsigned timeout);
 int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 		void __user *ubuffer, unsigned bufflen, u32 *result,
 		unsigned timeout);
 int __nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
 		void __user *ubuffer, unsigned bufflen,
 		void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
 		u32 *result, unsigned timeout);
 int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id);
 int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
 		struct nvme_id_ns **id);
 int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log);
 int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
 			dma_addr_t dma_addr, u32 *result);
 int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
 			dma_addr_t dma_addr, u32 *result);
 int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count);

 struct sg_io_hdr;

 int nvme_sg_io(struct nvme_ns *ns, struct sg_io_hdr __user *u_hdr);
 int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
 int nvme_sg_get_version_num(int __user *ip);

 #ifdef CONFIG_NVM
 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id);
 int nvme_nvm_register(struct request_queue *q, char *disk_name);
 void nvme_nvm_unregister(struct request_queue *q, char *disk_name);
 #else
 static inline int nvme_nvm_register(struct request_queue *q, char *disk_name)
 {
 	return 0;
 }

 static inline void nvme_nvm_unregister(struct request_queue *q, char *disk_name) {};

 static inline int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
 {
 	return 0;
 }
 #endif /* CONFIG_NVM */

 int __init nvme_core_init(void);
 void nvme_core_exit(void);

 #endif /* _NVME_H */
	/*
	* Copyright (c) 2011-2014, Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*/

	#ifndef _NVME_H
	#define _NVME_H

	#include <linux/nvme.h>
	#include <linux/pci.h>
	#include <linux/kref.h>
	#include <linux/blk-mq.h>

	enum {
	/*
	* Driver internal status code for commands that were cancelled due
	* to timeouts or controller shutdown. The value is negative so
	* that it a) doesn't overlap with the unsigned hardware error codes,
	* and b) can easily be tested for.
	*/
	NVME_SC_CANCELLED = -EINTR,
	};

	extern unsigned char nvme_io_timeout;
	#define NVME_IO_TIMEOUT (nvme_io_timeout * HZ)

	extern unsigned char admin_timeout;
	#define ADMIN_TIMEOUT (admin_timeout * HZ)

	extern unsigned char shutdown_timeout;
	#define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)

	enum {
	NVME_NS_LBA = 0,
	NVME_NS_LIGHTNVM = 1,
	};

	/*
	* List of workarounds for devices that required behavior not specified in
	* the standard.
	*/
	enum nvme_quirks {
	/*
	* Prefers I/O aligned to a stripe size specified in a vendor
	* specific Identify field.
	*/
	NVME_QUIRK_STRIPE_SIZE = (1 << 0),

	/*
	* The controller doesn't handle Identify value others than 0 or 1
	* correctly.
	*/
	NVME_QUIRK_IDENTIFY_CNS = (1 << 1),

	/*
	* The controller deterministically returns O's on reads to discarded
	* logical blocks.
	*/
	NVME_QUIRK_DISCARD_ZEROES = (1 << 2),
	};

	struct nvme_ctrl {
	const struct nvme_ctrl_ops *ops;
	struct request_queue *admin_q;
	struct device *dev;
	struct kref kref;
	int instance;
	struct blk_mq_tag_set *tagset;
	struct list_head namespaces;
	struct mutex namespaces_mutex;
	struct device device; / char device */
	struct list_head node;
	struct ida ns_ida;

	char name[12];
	char serial[20];
	char model[40];
	char firmware_rev[8];
	int cntlid;

	u32 ctrl_config;

	u32 page_size;
	u32 max_hw_sectors;
	u32 stripe_size;
	u16 oncs;
	u16 vid;
	atomic_t abort_limit;
	u8 event_limit;
	u8 vwc;
	u32 vs;
	bool subsystem;
	unsigned long quirks;
	};

	/*
	* An NVM Express namespace is equivalent to a SCSI LUN
	*/
	struct nvme_ns {
	struct list_head list;

	struct nvme_ctrl *ctrl;
	struct request_queue *queue;
	struct gendisk *disk;
	struct kref kref;
	int instance;

	u8 eui[8];
	u8 uuid[16];

	unsigned ns_id;
	int lba_shift;
	u16 ms;
	bool ext;
	u8 pi_type;
	int type;
	unsigned long flags;

	#define NVME_NS_REMOVING 0
	#define NVME_NS_DEAD 1

	u64 mode_select_num_blocks;
	u32 mode_select_block_len;
	};

	struct nvme_ctrl_ops {
	struct module *module;
	int (reg_read32)(struct nvme_ctrl ctrl, u32 off, u32 *val);
	int (reg_write32)(struct nvme_ctrl ctrl, u32 off, u32 val);
	int (reg_read64)(struct nvme_ctrl ctrl, u32 off, u64 *val);
	bool (io_incapable)(struct nvme_ctrl ctrl);
	int (reset_ctrl)(struct nvme_ctrl ctrl);
	void (free_ctrl)(struct nvme_ctrl ctrl);
	};

	static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl)
	{
	u32 val = 0;

	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
	return false;
	return val & NVME_CSTS_RDY;
	}

	static inline bool nvme_io_incapable(struct nvme_ctrl *ctrl)
	{
	u32 val = 0;

	if (ctrl->ops->io_incapable(ctrl))
	return true;
	if (ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &val))
	return true;
	return val & NVME_CSTS_CFS;
	}

	static inline int nvme_reset_subsystem(struct nvme_ctrl *ctrl)
	{
	if (!ctrl->subsystem)
	return -ENOTTY;
	return ctrl->ops->reg_write32(ctrl, NVME_REG_NSSR, 0x4E564D65);
	}

	static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
	{
	return (sector >> (ns->lba_shift - 9));
	}

	static inline void nvme_setup_flush(struct nvme_ns *ns,
	struct nvme_command *cmnd)
	{
	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->common.opcode = nvme_cmd_flush;
	cmnd->common.nsid = cpu_to_le32(ns->ns_id);
	}

	static inline void nvme_setup_rw(struct nvme_ns ns, struct request req,
	struct nvme_command *cmnd)
	{
	u16 control = 0;
	u32 dsmgmt = 0;

	if (req->cmd_flags & REQ_FUA)
	control \|= NVME_RW_FUA;
	if (req->cmd_flags & (REQ_FAILFAST_DEV \| REQ_RAHEAD))
	control \|= NVME_RW_LR;

	if (req->cmd_flags & REQ_RAHEAD)
	dsmgmt \|= NVME_RW_DSM_FREQ_PREFETCH;

	memset(cmnd, 0, sizeof(*cmnd));
	cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read);
	cmnd->rw.command_id = req->tag;
	cmnd->rw.nsid = cpu_to_le32(ns->ns_id);
	cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
	cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);

	if (ns->ms) {
	switch (ns->pi_type) {
	case NVME_NS_DPS_PI_TYPE3:
	control \|= NVME_RW_PRINFO_PRCHK_GUARD;
	break;
	case NVME_NS_DPS_PI_TYPE1:
	case NVME_NS_DPS_PI_TYPE2:
	control \|= NVME_RW_PRINFO_PRCHK_GUARD \|
	NVME_RW_PRINFO_PRCHK_REF;
	cmnd->rw.reftag = cpu_to_le32(
	nvme_block_nr(ns, blk_rq_pos(req)));
	break;
	}
	if (!blk_integrity_rq(req))
	control \|= NVME_RW_PRINFO_PRACT;
	}

	cmnd->rw.control = cpu_to_le16(control);
	cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt);
	}


	static inline int nvme_error_status(u16 status)
	{
	switch (status & 0x7ff) {
	case NVME_SC_SUCCESS:
	return 0;
	case NVME_SC_CAP_EXCEEDED:
	return -ENOSPC;
	default:
	return -EIO;
	}
	}

	static inline bool nvme_req_needs_retry(struct request *req, u16 status)
	{
	return !(status & NVME_SC_DNR \|\| blk_noretry_request(req)) &&
	(jiffies - req->start_time) < req->timeout;
	}

	int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
	int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
	int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
	int nvme_init_ctrl(struct nvme_ctrl ctrl, struct device dev,
	const struct nvme_ctrl_ops *ops, unsigned long quirks);
	void nvme_uninit_ctrl(struct nvme_ctrl *ctrl);
	void nvme_put_ctrl(struct nvme_ctrl *ctrl);
	int nvme_init_identify(struct nvme_ctrl *ctrl);

	void nvme_scan_namespaces(struct nvme_ctrl *ctrl);
	void nvme_remove_namespaces(struct nvme_ctrl *ctrl);

	void nvme_stop_queues(struct nvme_ctrl *ctrl);
	void nvme_start_queues(struct nvme_ctrl *ctrl);
	void nvme_kill_queues(struct nvme_ctrl *ctrl);

	struct request nvme_alloc_request(struct request_queue q,
	struct nvme_command *cmd, unsigned int flags);
	void nvme_requeue_req(struct request *req);
	int nvme_submit_sync_cmd(struct request_queue q, struct nvme_command cmd,
	void *buf, unsigned bufflen);
	int __nvme_submit_sync_cmd(struct request_queue q, struct nvme_command cmd,
	struct nvme_completion cqe, void buffer, unsigned bufflen,
	unsigned timeout);
	int nvme_submit_user_cmd(struct request_queue q, struct nvme_command cmd,
	void __user ubuffer, unsigned bufflen, u32 result,
	unsigned timeout);
	int __nvme_submit_user_cmd(struct request_queue q, struct nvme_command cmd,
	void __user *ubuffer, unsigned bufflen,
	void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
	u32 *result, unsigned timeout);
	int nvme_identify_ctrl(struct nvme_ctrl dev, struct nvme_id_ctrl *id);
	int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid,
	struct nvme_id_ns **id);
	int nvme_get_log_page(struct nvme_ctrl dev, struct nvme_smart_log *log);
	int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid,
	dma_addr_t dma_addr, u32 *result);
	int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11,
	dma_addr_t dma_addr, u32 *result);
	int nvme_set_queue_count(struct nvme_ctrl ctrl, int count);

	struct sg_io_hdr;

	int nvme_sg_io(struct nvme_ns ns, struct sg_io_hdr __user u_hdr);
	int nvme_sg_io32(struct nvme_ns *ns, unsigned long arg);
	int nvme_sg_get_version_num(int __user *ip);

	#ifdef CONFIG_NVM
	int nvme_nvm_ns_supported(struct nvme_ns ns, struct nvme_id_ns id);
	int nvme_nvm_register(struct request_queue q, char disk_name);
	void nvme_nvm_unregister(struct request_queue q, char disk_name);
	#else
	static inline int nvme_nvm_register(struct request_queue q, char disk_name)
	{
	return 0;
	}

	static inline void nvme_nvm_unregister(struct request_queue q, char disk_name) {};

	static inline int nvme_nvm_ns_supported(struct nvme_ns ns, struct nvme_id_ns id)
	{
	return 0;
	}
	#endif /* CONFIG_NVM */

	int __init nvme_core_init(void);
	void nvme_core_exit(void);

	#endif /* _NVME_H */