[SCSI] aic94xx: new driver

This is the end point of the separate aic94xx driver based on the
original driver and transport class from Luben Tuikov
<ltuikov@yahoo.com>

The log of the separate development is:

Alexis Bruemmer:
  o aic94xx: fix hotplug/unplug for expanderless systems
  o aic94xx: disable split completion timer/setting by default
  o aic94xx: wide port off expander support
  o aic94xx: remove various inline functions
  o aic94xx: use bitops
  o aic94xx: remove queue comment
  o aic94xx: remove sas_common.c
  o aic94xx: sas remove depot's
  o aic94xx: use available list_for_each_entry_safe_reverse()
  o aic94xx: sas header file merge

James Bottomley:
  o aic94xx: fix TF_TMF_NO_CTX processing
  o aic94xx: convert to request_firmware interface
  o aic94xx: fix hotplug/unplug
  o aic94xx: add link error counts to the expander phys
  o aic94xx: add transport class phy reset capability
  o aic94xx: remove local_attached flag
  o Remove README
  o Fixup Makefile variable for libsas rename
  o Rename sas->libsas
  o aic94xx: correct return code for sas_discover_event
  o aic94xx: use parent backlink port
  o aic94xx: remove channel abstraction
  o aic94xx: fix routing algorithms
  o aic94xx: add backlink port
  o aic94xx: fix cascaded expander properties
  o aic94xx: fix sleep under lock
  o aic94xx: fix panic on module removal in complex topology
  o aic94xx: make use of the new sas_port
  o rename sas_port to asd_sas_port
  o Fix for eh_strategy_handler move
  o aic94xx: move entirely over to correct transport class formulation
  o remove last vestages of sas_rphy_alloc()
  o update for eh_timed_out move
  o Preliminary expander support for aic94xx
  o sas: remove event thread
  o minor warning cleanups
  o remove last vestiges of id mapping arrays
  o Further updates
  o Convert aic94xx over entirely to the transport class end device and
  o update aic94xx/sas to use the new sas transport class end device
  o [PATCH] aic94xx: attaching to the sas transport class
  o Add missing completion removal from prior patch
  o [PATCH] aic94xx: attaching to the sas transport class
  o Build fixes from akpm

Jeff Garzik:
  o [scsi aic94xx] Remove ->owner from PCI info table

Luben Tuikov:
  o initial aic94xx driver

Mike Anderson:
  o aic94xx: fix panic on module insertion
  o aic94xx: stub out SATA_DEV case
  o aic94xx: compile warning cleanups
  o aic94xx: sas_alloc_task
  o aic94xx: ref count update
  o aic94xx nexus loss time value
  o [PATCH] aic94xx: driver assertion in non-x86 BIOS env

Randy Dunlap:
  o libsas: externs not needed

Robert Tarte:
  o aic94xx: sequence patch - fixes SATA support

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

include/scsi/libsas.h

@@ -0,0 +1,627 @@
+/*
+ * SAS host prototypes and structures header file
+ *
+ * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ *
+ * 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/list.h>
+#include <asm/semaphore.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_transport_sas.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_phy_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 */
+};
+
+/* ---------- Domain device ---------- */
+struct domain_device {
+        enum sas_dev_type dev_type;
+
+        enum sas_phy_linkrate linkrate;
+        enum sas_phy_linkrate min_linkrate;
+        enum sas_phy_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 {
+	spinlock_t disc_event_lock;
+	struct work_struct 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_phy_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 */
+};
+
+/* 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 work_struct   port_events[PORT_NUM_EVENTS];
+	struct work_struct   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_phy_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 semaphore  queue_thread_sema;
+	int               queue_thread_kill;
+};
+
+struct sas_ha_struct {
+/* private: */
+	spinlock_t       event_lock;
+	struct work_struct ha_events[HA_NUM_EVENTS];
+	unsigned long	 pending;
+
+	struct scsi_core core;
+
+/* public: */
+	char *sas_ha_name;
+	struct pci_dev *pcidev;	  /* should be set */
+	struct module *lldd_module; /* should be set */
+
+	u8 *sas_addr;		  /* must be set */
+	u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE];
+
+	spinlock_t      phy_port_lock;
+	struct asd_sas_phy  **sas_phy; /* array of valid pointers, must be set */
+	struct asd_sas_port **sas_port; /* array of valid pointers, must be set */
+	int             num_phys; /* must be set, gt 0, static */
+
+	/* The class calls this to send a task for execution. */
+	int lldd_max_execute_num;
+	int lldd_queue_size;
+
+	/* LLDD calls these to notify the class of an event. */
+	void (*notify_ha_event)(struct sas_ha_struct *, enum ha_event);
+	void (*notify_port_event)(struct asd_sas_phy *, enum port_event);
+	void (*notify_phy_event)(struct asd_sas_phy *, enum phy_event);
+
+	void *lldd_ha;		  /* not touched by sas class code */
+};
+
+#define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata)
+
+static inline struct domain_device *
+starget_to_domain_dev(struct scsi_target *starget) {
+	return starget->hostdata;
+}
+
+static inline struct domain_device *
+sdev_to_domain_dev(struct scsi_device *sdev) {
+	return starget_to_domain_dev(sdev->sdev_target);
+}
+
+static inline struct domain_device *
+cmd_to_domain_dev(struct scsi_cmnd *cmd)
+{
+	return sdev_to_domain_dev(cmd->device);
+}
+
+void sas_hash_addr(u8 *hashed, const u8 *sas_addr);
+
+/* Before calling a notify event, LLDD should use this function
+ * when the link is severed (possibly from its tasklet).
+ * The idea is that the Class only reads those, while the LLDD,
+ * can R/W these (thus avoiding a race).
+ */
+static inline void sas_phy_disconnected(struct asd_sas_phy *phy)
+{
+	phy->oob_mode = OOB_NOT_CONNECTED;
+	phy->linkrate = PHY_LINKRATE_NONE;
+}
+
+/* ---------- Tasks ---------- */
+/*
+      service_response |  SAS_TASK_COMPLETE  |  SAS_TASK_UNDELIVERED |
+  exec_status          |                     |                       |
+  ---------------------+---------------------+-----------------------+
+       SAM_...         |         X           |                       |
+       DEV_NO_RESPONSE |         X           |           X           |
+       INTERRUPTED     |         X           |                       |
+       QUEUE_FULL      |                     |           X           |
+       DEVICE_UNKNOWN  |                     |           X           |
+       SG_ERR          |                     |           X           |
+  ---------------------+---------------------+-----------------------+
+ */
+
+enum service_response {
+	SAS_TASK_COMPLETE,
+	SAS_TASK_UNDELIVERED = -1,
+};
+
+enum exec_status {
+	SAM_GOOD         = 0,
+	SAM_CHECK_COND   = 2,
+	SAM_COND_MET     = 4,
+	SAM_BUSY         = 8,
+	SAM_INTERMEDIATE = 0x10,
+	SAM_IM_COND_MET  = 0x12,
+	SAM_RESV_CONFLICT= 0x14,
+	SAM_TASK_SET_FULL= 0x28,
+	SAM_ACA_ACTIVE   = 0x30,
+	SAM_TASK_ABORTED = 0x40,
+
+	SAS_DEV_NO_RESPONSE = 0x80,
+	SAS_DATA_UNDERRUN,
+	SAS_DATA_OVERRUN,
+	SAS_INTERRUPTED,
+	SAS_QUEUE_FULL,
+	SAS_DEVICE_UNKNOWN,
+	SAS_SG_ERR,
+	SAS_OPEN_REJECT,
+	SAS_OPEN_TO,
+	SAS_PROTO_RESPONSE,
+	SAS_PHY_DOWN,
+	SAS_NAK_R_ERR,
+	SAS_PENDING,
+	SAS_ABORTED_TASK,
+};
+
+/* When a task finishes with a response, the LLDD examines the
+ * response:
+ * 	- For an ATA task task_status_struct::stat is set to
+ * SAS_PROTO_RESPONSE, and the task_status_struct::buf is set to the
+ * contents of struct ata_task_resp.
+ * 	- For SSP tasks, if no data is present or status/TMF response
+ * is valid, task_status_struct::stat is set.  If data is present
+ * (SENSE data), the LLDD copies up to SAS_STATUS_BUF_SIZE, sets
+ * task_status_struct::buf_valid_size, and task_status_struct::stat is
+ * set to SAM_CHECK_COND.
+ *
+ * "buf" has format SCSI Sense for SSP task, or struct ata_task_resp
+ * for ATA task.
+ *
+ * "frame_len" is the total frame length, which could be more or less
+ * than actually copied.
+ *
+ * Tasks ending with response, always set the residual field.
+ */
+struct ata_task_resp {
+	u16  frame_len;
+	u8   ending_fis[24];	  /* dev to host or data-in */
+	u32  sstatus;
+	u32  serror;
+	u32  scontrol;
+	u32  sactive;
+};
+
+#define SAS_STATUS_BUF_SIZE 96
+
+struct task_status_struct {
+	enum service_response resp;
+	enum exec_status      stat;
+	int  buf_valid_size;
+
+	u8   buf[SAS_STATUS_BUF_SIZE];
+
+	u32  residual;
+	enum sas_open_rej_reason open_rej_reason;
+};
+
+/* ATA and ATAPI task queuable to a SAS LLDD.
+ */
+struct sas_ata_task {
+	struct host_to_dev_fis fis;
+	u8     atapi_packet[16];  /* 0 if not ATAPI task */
+
+	u8     retry_count;	  /* hardware retry, should be > 0 */
+
+	u8     dma_xfer:1;	  /* PIO:0 or DMA:1 */
+	u8     use_ncq:1;
+	u8     set_affil_pol:1;
+	u8     stp_affil_pol:1;
+
+	u8     device_control_reg_update:1;
+};
+
+struct sas_smp_task {
+	struct scatterlist smp_req;
+	struct scatterlist smp_resp;
+};
+
+enum task_attribute {
+	TASK_ATTR_SIMPLE = 0,
+	TASK_ATTR_HOQ    = 1,
+	TASK_ATTR_ORDERED= 2,
+	TASK_ATTR_ACA    = 4,
+};
+
+struct sas_ssp_task {
+	u8     retry_count;	  /* hardware retry, should be > 0 */
+
+	u8     LUN[8];
+	u8     enable_first_burst:1;
+	enum   task_attribute task_attr;
+	u8     task_prio;
+	u8     cdb[16];
+};
+
+struct sas_task {
+	struct domain_device *dev;
+	struct list_head      list;
+
+	spinlock_t   task_state_lock;
+	unsigned     task_state_flags;
+
+	enum   sas_proto      task_proto;
+
+	/* Used by the discovery code. */
+	struct timer_list     timer;
+	struct completion     completion;
+
+	union {
+		struct sas_ata_task ata_task;
+		struct sas_smp_task smp_task;
+		struct sas_ssp_task ssp_task;
+	};
+
+	struct scatterlist *scatter;
+	int    num_scatter;
+	u32    total_xfer_len;
+	u8     data_dir:2;	  /* Use PCI_DMA_... */
+
+	struct task_status_struct task_status;
+	void   (*task_done)(struct sas_task *);
+
+	void   *lldd_task;	  /* for use by LLDDs */
+	void   *uldd_task;
+};
+
+
+
+#define SAS_TASK_STATE_PENDING  1
+#define SAS_TASK_STATE_DONE     2
+#define SAS_TASK_STATE_ABORTED  4
+
+static inline struct sas_task *sas_alloc_task(unsigned long flags)
+{
+	extern kmem_cache_t *sas_task_cache;
+	struct sas_task *task = kmem_cache_alloc(sas_task_cache, flags);
+
+	if (task) {
+		memset(task, 0, sizeof(*task));
+		INIT_LIST_HEAD(&task->list);
+		spin_lock_init(&task->task_state_lock);
+		task->task_state_flags = SAS_TASK_STATE_PENDING;
+		init_timer(&task->timer);
+		init_completion(&task->completion);
+	}
+
+	return task;
+}
+
+static inline void sas_free_task(struct sas_task *task)
+{
+	if (task) {
+		extern kmem_cache_t *sas_task_cache;
+		BUG_ON(!list_empty(&task->list));
+		kmem_cache_free(sas_task_cache, task);
+	}
+}
+
+struct sas_domain_function_template {
+	/* The class calls these to notify the LLDD of an event. */
+	void (*lldd_port_formed)(struct asd_sas_phy *);
+	void (*lldd_port_deformed)(struct asd_sas_phy *);
+
+	/* The class calls these when a device is found or gone. */
+	int  (*lldd_dev_found)(struct domain_device *);
+	void (*lldd_dev_gone)(struct domain_device *);
+
+	int (*lldd_execute_task)(struct sas_task *, int num,
+				 unsigned long gfp_flags);
+
+	/* Task Management Functions. Must be called from process context. */
+	int (*lldd_abort_task)(struct sas_task *);
+	int (*lldd_abort_task_set)(struct domain_device *, u8 *lun);
+	int (*lldd_clear_aca)(struct domain_device *, u8 *lun);
+	int (*lldd_clear_task_set)(struct domain_device *, u8 *lun);
+	int (*lldd_I_T_nexus_reset)(struct domain_device *);
+	int (*lldd_lu_reset)(struct domain_device *, u8 *lun);
+	int (*lldd_query_task)(struct sas_task *);
+
+	/* Port and Adapter management */
+	int (*lldd_clear_nexus_port)(struct asd_sas_port *);
+	int (*lldd_clear_nexus_ha)(struct sas_ha_struct *);
+
+	/* Phy management */
+	int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func);
+};
+
+extern int sas_register_ha(struct sas_ha_struct *);
+extern int sas_unregister_ha(struct sas_ha_struct *);
+
+extern int sas_queuecommand(struct scsi_cmnd *,
+		     void (*scsi_done)(struct scsi_cmnd *));
+extern int sas_target_alloc(struct scsi_target *);
+extern int sas_slave_alloc(struct scsi_device *);
+extern int sas_slave_configure(struct scsi_device *);
+extern void sas_slave_destroy(struct scsi_device *);
+extern int sas_change_queue_depth(struct scsi_device *, int new_depth);
+extern int sas_change_queue_type(struct scsi_device *, int qt);
+extern int sas_bios_param(struct scsi_device *,
+			  struct block_device *,
+			  sector_t capacity, int *hsc);
+extern struct scsi_transport_template *
+sas_domain_attach_transport(struct sas_domain_function_template *);
+extern void sas_domain_release_transport(struct scsi_transport_template *);
+
+int  sas_discover_root_expander(struct domain_device *);
+
+void sas_init_ex_attr(void);
+
+int  sas_ex_revalidate_domain(struct domain_device *);
+
+void sas_unregister_domain_devices(struct asd_sas_port *port);
+void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *);
+int  sas_discover_event(struct asd_sas_port *, enum discover_event ev);
+
+int  sas_discover_sata(struct domain_device *);
+int  sas_discover_end_dev(struct domain_device *);
+
+void sas_unregister_dev(struct domain_device *);
+
+void sas_init_dev(struct domain_device *);
+
+#endif /* _SASLIB_H_ */