libsas.h

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/*
 * SAS host prototypes and structures header file
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <[e-mail]>
 *
 * This file is licensed under GPLv2.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 */

#ifndef _LIBSAS_H_
#define _LIBSAS_H_


#include <linux/timer.h>
#include <linux/pci.h>
#include <scsi/sas.h>
#include <linux/libata.h>
#include <linux/list.h>
#include <asm/semaphore.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_transport_sas.h>
#include <linux/scatterlist.h>

struct block_device;

enum sas_class {
	SAS,
	EXPANDER
};

enum sas_phy_role {
	PHY_ROLE_NONE = 0,
	PHY_ROLE_TARGET = 0x40,
	PHY_ROLE_INITIATOR = 0x80,
};

enum sas_phy_type {
        PHY_TYPE_PHYSICAL,
        PHY_TYPE_VIRTUAL
};

/* The events are mnemonically described in sas_dump.c
 * so when updating/adding events here, please also
 * update the other file too.
 */
enum ha_event {
	HAE_RESET             = 0U,
	HA_NUM_EVENTS         = 1,
};

enum port_event {
	PORTE_BYTES_DMAED     = 0U,
	PORTE_BROADCAST_RCVD  = 1,
	PORTE_LINK_RESET_ERR  = 2,
	PORTE_TIMER_EVENT     = 3,
	PORTE_HARD_RESET      = 4,
	PORT_NUM_EVENTS       = 5,
};

enum phy_event {
	PHYE_LOSS_OF_SIGNAL   = 0U,
	PHYE_OOB_DONE         = 1,
	PHYE_OOB_ERROR        = 2,
	PHYE_SPINUP_HOLD      = 3, /* hot plug SATA, no COMWAKE sent */
	PHY_NUM_EVENTS        = 4,
};

enum discover_event {
	DISCE_DISCOVER_DOMAIN   = 0U,
	DISCE_REVALIDATE_DOMAIN = 1,
	DISCE_PORT_GONE         = 2,
	DISC_NUM_EVENTS 	= 3,
};

/* ---------- Expander Devices ---------- */

#define ETASK 0xFA

#define to_dom_device(_obj) container_of(_obj, struct domain_device, dev_obj)
#define to_dev_attr(_attr)  container_of(_attr, struct domain_dev_attribute,\
                                         attr)

enum routing_attribute {
	DIRECT_ROUTING,
	SUBTRACTIVE_ROUTING,
	TABLE_ROUTING,
};

enum ex_phy_state {
	PHY_EMPTY,
	PHY_VACANT,
	PHY_NOT_PRESENT,
	PHY_DEVICE_DISCOVERED
};

struct ex_phy {
	int    phy_id;

	enum ex_phy_state phy_state;

	enum sas_dev_type attached_dev_type;
	enum sas_linkrate linkrate;

	u8   attached_sata_host:1;
	u8   attached_sata_dev:1;
	u8   attached_sata_ps:1;

	enum sas_proto attached_tproto;
	enum sas_proto attached_iproto;

	u8   attached_sas_addr[SAS_ADDR_SIZE];
	u8   attached_phy_id;

	u8   phy_change_count;
	enum routing_attribute routing_attr;
	u8   virtual:1;

	int  last_da_index;

	struct sas_phy *phy;
	struct sas_port *port;
};

struct expander_device {
	struct list_head children;

	u16    ex_change_count;
	u16    max_route_indexes;
	u8     num_phys;
	u8     configuring:1;
	u8     conf_route_table:1;
	u8     enclosure_logical_id[8];

	struct ex_phy *ex_phy;
	struct sas_port *parent_port;
};

/* ---------- SATA device ---------- */
enum ata_command_set {
        ATA_COMMAND_SET   = 0,
        ATAPI_COMMAND_SET = 1,
};

struct sata_device {
        enum   ata_command_set command_set;
        struct smp_resp        rps_resp; /* report_phy_sata_resp */
        __le16 *identify_device;
        __le16 *identify_packet_device;

        u8     port_no;        /* port number, if this is a PM (Port) */
        struct list_head children; /* PM Ports if this is a PM */

	struct ata_port *ap;
	struct ata_host ata_host;
	struct ata_taskfile tf;
	u32 sstatus;
	u32 serror;
	u32 scontrol;
};

/* ---------- Domain device ---------- */
struct domain_device {
        enum sas_dev_type dev_type;

        enum sas_linkrate linkrate;
        enum sas_linkrate min_linkrate;
        enum sas_linkrate max_linkrate;

        int  pathways;

        struct domain_device *parent;
        struct list_head siblings; /* devices on the same level */
        struct asd_sas_port *port;        /* shortcut to root of the tree */

        struct list_head dev_list_node;

        enum sas_proto    iproto;
        enum sas_proto    tproto;

        struct sas_rphy *rphy;

        u8  sas_addr[SAS_ADDR_SIZE];
        u8  hashed_sas_addr[HASHED_SAS_ADDR_SIZE];

        u8  frame_rcvd[32];

        union {
                struct expander_device ex_dev;
                struct sata_device     sata_dev; /* STP & directly attached */
        };

        void *lldd_dev;
};

struct sas_discovery_event {
	struct work_struct work;
	struct asd_sas_port *port;
};

struct sas_discovery {
	spinlock_t disc_event_lock;
	struct sas_discovery_event disc_work[DISC_NUM_EVENTS];
	unsigned long    pending;
	u8     fanout_sas_addr[8];
	u8     eeds_a[8];
	u8     eeds_b[8];
	int    max_level;
};


/* The port struct is Class:RW, driver:RO */
struct asd_sas_port {
/* private: */
	struct completion port_gone_completion;

	struct sas_discovery disc;
	struct domain_device *port_dev;
	spinlock_t dev_list_lock;
	struct list_head dev_list;
	enum   sas_linkrate linkrate;

	struct sas_phy *phy;
	struct work_struct work;

/* public: */
	int id;

	enum sas_class   class;
	u8               sas_addr[SAS_ADDR_SIZE];
	u8               attached_sas_addr[SAS_ADDR_SIZE];
	enum sas_proto   iproto;
	enum sas_proto   tproto;

	enum sas_oob_mode oob_mode;

	spinlock_t       phy_list_lock;
	struct list_head phy_list;
	int              num_phys;
	u32              phy_mask;

	struct sas_ha_struct *ha;

	struct sas_port	*port;

	void *lldd_port;	  /* not touched by the sas class code */
};

struct asd_sas_event {
	struct work_struct work;
	struct asd_sas_phy *phy;
};

/* The phy pretty much is controlled by the LLDD.
 * The class only reads those fields.
 */
struct asd_sas_phy {
/* private: */
	/* protected by ha->event_lock */
	struct asd_sas_event   port_events[PORT_NUM_EVENTS];
	struct asd_sas_event   phy_events[PHY_NUM_EVENTS];

	unsigned long port_events_pending;
	unsigned long phy_events_pending;

	int error;

	struct sas_phy *phy;

/* public: */
	/* The following are class:RO, driver:R/W */
	int            enabled;	  /* must be set */

	int            id;	  /* must be set */
	enum sas_class class;
	enum sas_proto iproto;
	enum sas_proto tproto;

	enum sas_phy_type  type;
	enum sas_phy_role  role;
	enum sas_oob_mode  oob_mode;
	enum sas_linkrate linkrate;

	u8   *sas_addr;		  /* must be set */
	u8   attached_sas_addr[SAS_ADDR_SIZE]; /* class:RO, driver: R/W */

	spinlock_t     frame_rcvd_lock;
	u8             *frame_rcvd; /* must be set */
	int            frame_rcvd_size;

	spinlock_t     sas_prim_lock;
	u32            sas_prim;

	struct list_head port_phy_el; /* driver:RO */
	struct asd_sas_port      *port; /* Class:RW, driver: RO */

	struct sas_ha_struct *ha; /* may be set; the class sets it anyway */

	void *lldd_phy;		  /* not touched by the sas_class_code */
};

struct scsi_core {
	struct Scsi_Host *shost;

	spinlock_t        task_queue_lock;
	struct list_head  task_queue;
	int               task_queue_size;

	struct task_struct *queue_thread;
};

struct sas_ha_event {
	struct work_struct work;
	struct sas_ha_struct *ha;
};

enum sas_ha_state {
	SAS_HA_REGISTERED,
	SAS_HA_UNREGISTERED
};

struct sas_ha_struct {
/* private: */
	spinlock_t       event_lock;