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710 lines
18 KiB
710 lines
18 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* SAS host prototypes and structures header file |
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* |
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved. |
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* Copyright (C) 2005 Luben Tuikov <[email protected]> |
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*/ |
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#ifndef _LIBSAS_H_ |
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#define _LIBSAS_H_ |
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#include <linux/timer.h> |
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#include <linux/pci.h> |
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#include <scsi/sas.h> |
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#include <linux/libata.h> |
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#include <linux/list.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_transport_sas.h> |
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#include <linux/scatterlist.h> |
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#include <linux/slab.h> |
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struct block_device; |
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enum sas_class { |
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SAS, |
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EXPANDER |
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}; |
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enum sas_phy_role { |
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PHY_ROLE_NONE = 0, |
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PHY_ROLE_TARGET = 0x40, |
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PHY_ROLE_INITIATOR = 0x80, |
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}; |
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enum sas_phy_type { |
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PHY_TYPE_PHYSICAL, |
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PHY_TYPE_VIRTUAL |
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}; |
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/* The events are mnemonically described in sas_dump.c |
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* so when updating/adding events here, please also |
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* update the other file too. |
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*/ |
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enum port_event { |
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PORTE_BYTES_DMAED = 0U, |
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PORTE_BROADCAST_RCVD, |
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PORTE_LINK_RESET_ERR, |
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PORTE_TIMER_EVENT, |
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PORTE_HARD_RESET, |
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PORT_NUM_EVENTS, |
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}; |
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enum phy_event { |
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PHYE_LOSS_OF_SIGNAL = 0U, |
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PHYE_OOB_DONE, |
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PHYE_OOB_ERROR, |
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PHYE_SPINUP_HOLD, /* hot plug SATA, no COMWAKE sent */ |
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PHYE_RESUME_TIMEOUT, |
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PHYE_SHUTDOWN, |
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PHY_NUM_EVENTS, |
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}; |
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enum discover_event { |
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DISCE_DISCOVER_DOMAIN = 0U, |
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DISCE_REVALIDATE_DOMAIN, |
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DISCE_SUSPEND, |
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DISCE_RESUME, |
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DISC_NUM_EVENTS, |
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}; |
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/* ---------- Expander Devices ---------- */ |
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#define to_dom_device(_obj) container_of(_obj, struct domain_device, dev_obj) |
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#define to_dev_attr(_attr) container_of(_attr, struct domain_dev_attribute,\ |
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attr) |
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enum routing_attribute { |
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DIRECT_ROUTING, |
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SUBTRACTIVE_ROUTING, |
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TABLE_ROUTING, |
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}; |
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enum ex_phy_state { |
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PHY_EMPTY, |
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PHY_VACANT, |
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PHY_NOT_PRESENT, |
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PHY_DEVICE_DISCOVERED |
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}; |
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struct ex_phy { |
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int phy_id; |
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enum ex_phy_state phy_state; |
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enum sas_device_type attached_dev_type; |
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enum sas_linkrate linkrate; |
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u8 attached_sata_host:1; |
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u8 attached_sata_dev:1; |
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u8 attached_sata_ps:1; |
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enum sas_protocol attached_tproto; |
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enum sas_protocol attached_iproto; |
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u8 attached_sas_addr[SAS_ADDR_SIZE]; |
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u8 attached_phy_id; |
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int phy_change_count; |
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enum routing_attribute routing_attr; |
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u8 virtual:1; |
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int last_da_index; |
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struct sas_phy *phy; |
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struct sas_port *port; |
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}; |
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struct expander_device { |
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struct list_head children; |
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int ex_change_count; |
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u16 max_route_indexes; |
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u8 num_phys; |
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u8 t2t_supp:1; |
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u8 configuring:1; |
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u8 conf_route_table:1; |
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u8 enclosure_logical_id[8]; |
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struct ex_phy *ex_phy; |
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struct sas_port *parent_port; |
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struct mutex cmd_mutex; |
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}; |
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/* ---------- SATA device ---------- */ |
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#define ATA_RESP_FIS_SIZE 24 |
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struct sata_device { |
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unsigned int class; |
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u8 port_no; /* port number, if this is a PM (Port) */ |
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struct ata_port *ap; |
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struct ata_host *ata_host; |
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struct smp_resp rps_resp ____cacheline_aligned; /* report_phy_sata_resp */ |
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u8 fis[ATA_RESP_FIS_SIZE]; |
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}; |
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struct ssp_device { |
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struct list_head eh_list_node; /* pending a user requested eh action */ |
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struct scsi_lun reset_lun; |
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}; |
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enum { |
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SAS_DEV_GONE, |
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SAS_DEV_FOUND, /* device notified to lldd */ |
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SAS_DEV_DESTROY, |
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SAS_DEV_EH_PENDING, |
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SAS_DEV_LU_RESET, |
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SAS_DEV_RESET, |
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}; |
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struct domain_device { |
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spinlock_t done_lock; |
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enum sas_device_type dev_type; |
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enum sas_linkrate linkrate; |
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enum sas_linkrate min_linkrate; |
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enum sas_linkrate max_linkrate; |
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int pathways; |
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struct domain_device *parent; |
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struct list_head siblings; /* devices on the same level */ |
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struct asd_sas_port *port; /* shortcut to root of the tree */ |
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struct sas_phy *phy; |
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struct list_head dev_list_node; |
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struct list_head disco_list_node; /* awaiting probe or destruct */ |
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enum sas_protocol iproto; |
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enum sas_protocol tproto; |
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struct sas_rphy *rphy; |
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u8 sas_addr[SAS_ADDR_SIZE]; |
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u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE]; |
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u8 frame_rcvd[32]; |
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union { |
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struct expander_device ex_dev; |
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struct sata_device sata_dev; /* STP & directly attached */ |
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struct ssp_device ssp_dev; |
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}; |
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void *lldd_dev; |
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unsigned long state; |
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struct kref kref; |
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}; |
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struct sas_work { |
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struct list_head drain_node; |
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struct work_struct work; |
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}; |
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static inline bool dev_is_expander(enum sas_device_type type) |
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{ |
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return type == SAS_EDGE_EXPANDER_DEVICE || |
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type == SAS_FANOUT_EXPANDER_DEVICE; |
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} |
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static inline void INIT_SAS_WORK(struct sas_work *sw, void (*fn)(struct work_struct *)) |
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{ |
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INIT_WORK(&sw->work, fn); |
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INIT_LIST_HEAD(&sw->drain_node); |
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} |
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struct sas_discovery_event { |
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struct sas_work work; |
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struct asd_sas_port *port; |
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}; |
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static inline struct sas_discovery_event *to_sas_discovery_event(struct work_struct *work) |
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{ |
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struct sas_discovery_event *ev = container_of(work, typeof(*ev), work.work); |
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return ev; |
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} |
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struct sas_discovery { |
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struct sas_discovery_event disc_work[DISC_NUM_EVENTS]; |
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unsigned long pending; |
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u8 fanout_sas_addr[SAS_ADDR_SIZE]; |
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u8 eeds_a[SAS_ADDR_SIZE]; |
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u8 eeds_b[SAS_ADDR_SIZE]; |
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int max_level; |
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}; |
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/* The port struct is Class:RW, driver:RO */ |
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struct asd_sas_port { |
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/* private: */ |
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struct sas_discovery disc; |
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struct domain_device *port_dev; |
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spinlock_t dev_list_lock; |
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struct list_head dev_list; |
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struct list_head disco_list; |
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struct list_head destroy_list; |
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struct list_head sas_port_del_list; |
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enum sas_linkrate linkrate; |
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struct sas_work work; |
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int suspended; |
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/* public: */ |
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int id; |
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enum sas_class class; |
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u8 sas_addr[SAS_ADDR_SIZE]; |
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u8 attached_sas_addr[SAS_ADDR_SIZE]; |
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enum sas_protocol iproto; |
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enum sas_protocol tproto; |
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enum sas_oob_mode oob_mode; |
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spinlock_t phy_list_lock; |
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struct list_head phy_list; |
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int num_phys; |
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u32 phy_mask; |
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struct sas_ha_struct *ha; |
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struct sas_port *port; |
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void *lldd_port; /* not touched by the sas class code */ |
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}; |
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struct asd_sas_event { |
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struct sas_work work; |
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struct asd_sas_phy *phy; |
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int event; |
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}; |
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static inline struct asd_sas_event *to_asd_sas_event(struct work_struct *work) |
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{ |
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struct asd_sas_event *ev = container_of(work, typeof(*ev), work.work); |
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return ev; |
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} |
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static inline void INIT_SAS_EVENT(struct asd_sas_event *ev, |
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void (*fn)(struct work_struct *), |
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struct asd_sas_phy *phy, int event) |
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{ |
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INIT_SAS_WORK(&ev->work, fn); |
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ev->phy = phy; |
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ev->event = event; |
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} |
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#define SAS_PHY_SHUTDOWN_THRES 1024 |
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/* The phy pretty much is controlled by the LLDD. |
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* The class only reads those fields. |
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*/ |
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struct asd_sas_phy { |
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/* private: */ |
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atomic_t event_nr; |
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int in_shutdown; |
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int error; |
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int suspended; |
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struct sas_phy *phy; |
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/* public: */ |
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/* The following are class:RO, driver:R/W */ |
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int enabled; /* must be set */ |
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int id; /* must be set */ |
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enum sas_class class; |
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enum sas_protocol iproto; |
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enum sas_protocol tproto; |
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enum sas_phy_type type; |
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enum sas_phy_role role; |
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enum sas_oob_mode oob_mode; |
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enum sas_linkrate linkrate; |
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u8 *sas_addr; /* must be set */ |
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u8 attached_sas_addr[SAS_ADDR_SIZE]; /* class:RO, driver: R/W */ |
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spinlock_t frame_rcvd_lock; |
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u8 *frame_rcvd; /* must be set */ |
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int frame_rcvd_size; |
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spinlock_t sas_prim_lock; |
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u32 sas_prim; |
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struct list_head port_phy_el; /* driver:RO */ |
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struct asd_sas_port *port; /* Class:RW, driver: RO */ |
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struct sas_ha_struct *ha; /* may be set; the class sets it anyway */ |
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void *lldd_phy; /* not touched by the sas_class_code */ |
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}; |
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struct scsi_core { |
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struct Scsi_Host *shost; |
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}; |
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enum sas_ha_state { |
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SAS_HA_REGISTERED, |
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SAS_HA_DRAINING, |
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SAS_HA_ATA_EH_ACTIVE, |
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SAS_HA_FROZEN, |
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}; |
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struct sas_ha_struct { |
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/* private: */ |
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struct list_head defer_q; /* work queued while draining */ |
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struct mutex drain_mutex; |
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unsigned long state; |
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spinlock_t lock; |
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int eh_active; |
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wait_queue_head_t eh_wait_q; |
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struct list_head eh_dev_q; |
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struct mutex disco_mutex; |
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struct scsi_core core; |
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/* public: */ |
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char *sas_ha_name; |
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struct device *dev; /* should be set */ |
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struct module *lldd_module; /* should be set */ |
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struct workqueue_struct *event_q; |
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struct workqueue_struct *disco_q; |
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u8 *sas_addr; /* must be set */ |
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u8 hashed_sas_addr[HASHED_SAS_ADDR_SIZE]; |
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spinlock_t phy_port_lock; |
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struct asd_sas_phy **sas_phy; /* array of valid pointers, must be set */ |
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struct asd_sas_port **sas_port; /* array of valid pointers, must be set */ |
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int num_phys; /* must be set, gt 0, static */ |
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int strict_wide_ports; /* both sas_addr and attached_sas_addr must match |
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* their siblings when forming wide ports */ |
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void *lldd_ha; /* not touched by sas class code */ |
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struct list_head eh_done_q; /* complete via scsi_eh_flush_done_q */ |
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struct list_head eh_ata_q; /* scmds to promote from sas to ata eh */ |
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int event_thres; |
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}; |
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#define SHOST_TO_SAS_HA(_shost) (*(struct sas_ha_struct **)(_shost)->hostdata) |
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static inline struct domain_device * |
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starget_to_domain_dev(struct scsi_target *starget) { |
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return starget->hostdata; |
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} |
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static inline struct domain_device * |
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sdev_to_domain_dev(struct scsi_device *sdev) { |
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return starget_to_domain_dev(sdev->sdev_target); |
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} |
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static inline struct ata_device *sas_to_ata_dev(struct domain_device *dev) |
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{ |
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return &dev->sata_dev.ap->link.device[0]; |
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} |
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static inline struct domain_device * |
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cmd_to_domain_dev(struct scsi_cmnd *cmd) |
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{ |
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return sdev_to_domain_dev(cmd->device); |
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} |
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void sas_hash_addr(u8 *hashed, const u8 *sas_addr); |
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/* Before calling a notify event, LLDD should use this function |
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* when the link is severed (possibly from its tasklet). |
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* The idea is that the Class only reads those, while the LLDD, |
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* can R/W these (thus avoiding a race). |
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*/ |
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static inline void sas_phy_disconnected(struct asd_sas_phy *phy) |
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{ |
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phy->oob_mode = OOB_NOT_CONNECTED; |
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phy->linkrate = SAS_LINK_RATE_UNKNOWN; |
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} |
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static inline unsigned int to_sas_gpio_od(int device, int bit) |
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{ |
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return 3 * device + bit; |
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} |
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static inline void sas_put_local_phy(struct sas_phy *phy) |
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{ |
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put_device(&phy->dev); |
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} |
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#ifdef CONFIG_SCSI_SAS_HOST_SMP |
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int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count); |
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#else |
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static inline int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count) |
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{ |
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return -1; |
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} |
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#endif |
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/* ---------- Tasks ---------- */ |
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/* |
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service_response | SAS_TASK_COMPLETE | SAS_TASK_UNDELIVERED | |
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exec_status | | | |
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---------------------+---------------------+-----------------------+ |
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SAM_... | X | | |
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DEV_NO_RESPONSE | X | X | |
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INTERRUPTED | X | | |
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QUEUE_FULL | | X | |
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DEVICE_UNKNOWN | | X | |
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SG_ERR | | X | |
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---------------------+---------------------+-----------------------+ |
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*/ |
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enum service_response { |
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SAS_TASK_COMPLETE, |
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SAS_TASK_UNDELIVERED = -1, |
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}; |
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enum exec_status { |
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/* The SAM_STAT_.. codes fit in the lower 6 bits, alias some of |
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* them here to silence 'case value not in enumerated type' warnings |
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*/ |
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__SAM_STAT_CHECK_CONDITION = SAM_STAT_CHECK_CONDITION, |
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SAS_DEV_NO_RESPONSE = 0x80, |
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SAS_DATA_UNDERRUN, |
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SAS_DATA_OVERRUN, |
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SAS_INTERRUPTED, |
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SAS_QUEUE_FULL, |
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SAS_DEVICE_UNKNOWN, |
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SAS_SG_ERR, |
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SAS_OPEN_REJECT, |
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SAS_OPEN_TO, |
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SAS_PROTO_RESPONSE, |
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SAS_PHY_DOWN, |
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SAS_NAK_R_ERR, |
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SAS_PENDING, |
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SAS_ABORTED_TASK, |
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}; |
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/* When a task finishes with a response, the LLDD examines the |
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* response: |
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* - For an ATA task task_status_struct::stat is set to |
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* SAS_PROTO_RESPONSE, and the task_status_struct::buf is set to the |
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* contents of struct ata_task_resp. |
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* - For SSP tasks, if no data is present or status/TMF response |
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* is valid, task_status_struct::stat is set. If data is present |
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* (SENSE data), the LLDD copies up to SAS_STATUS_BUF_SIZE, sets |
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* task_status_struct::buf_valid_size, and task_status_struct::stat is |
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* set to SAM_CHECK_COND. |
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* |
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* "buf" has format SCSI Sense for SSP task, or struct ata_task_resp |
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* for ATA task. |
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* |
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* "frame_len" is the total frame length, which could be more or less |
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* than actually copied. |
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* |
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* Tasks ending with response, always set the residual field. |
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*/ |
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struct ata_task_resp { |
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u16 frame_len; |
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u8 ending_fis[ATA_RESP_FIS_SIZE]; /* dev to host or data-in */ |
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}; |
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#define SAS_STATUS_BUF_SIZE 96 |
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struct task_status_struct { |
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enum service_response resp; |
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enum exec_status stat; |
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int buf_valid_size; |
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u8 buf[SAS_STATUS_BUF_SIZE]; |
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u32 residual; |
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enum sas_open_rej_reason open_rej_reason; |
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}; |
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/* ATA and ATAPI task queuable to a SAS LLDD. |
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*/ |
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struct sas_ata_task { |
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struct host_to_dev_fis fis; |
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u8 atapi_packet[16]; /* 0 if not ATAPI task */ |
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u8 retry_count; /* hardware retry, should be > 0 */ |
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u8 dma_xfer:1; /* PIO:0 or DMA:1 */ |
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u8 use_ncq:1; |
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u8 set_affil_pol:1; |
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u8 stp_affil_pol:1; |
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u8 device_control_reg_update:1; |
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}; |
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struct sas_smp_task { |
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struct scatterlist smp_req; |
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struct scatterlist smp_resp; |
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}; |
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enum task_attribute { |
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TASK_ATTR_SIMPLE = 0, |
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TASK_ATTR_HOQ = 1, |
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TASK_ATTR_ORDERED= 2, |
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TASK_ATTR_ACA = 4, |
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}; |
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struct sas_ssp_task { |
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u8 retry_count; /* hardware retry, should be > 0 */ |
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u8 LUN[8]; |
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u8 enable_first_burst:1; |
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enum task_attribute task_attr; |
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u8 task_prio; |
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struct scsi_cmnd *cmd; |
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}; |
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struct sas_task { |
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struct domain_device *dev; |
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spinlock_t task_state_lock; |
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unsigned task_state_flags; |
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enum sas_protocol task_proto; |
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union { |
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struct sas_ata_task ata_task; |
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struct sas_smp_task smp_task; |
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struct sas_ssp_task ssp_task; |
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}; |
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struct scatterlist *scatter; |
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int num_scatter; |
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u32 total_xfer_len; |
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u8 data_dir:2; /* Use PCI_DMA_... */ |
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struct task_status_struct task_status; |
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void (*task_done)(struct sas_task *); |
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void *lldd_task; /* for use by LLDDs */ |
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void *uldd_task; |
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struct sas_task_slow *slow_task; |
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}; |
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struct sas_task_slow { |
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/* standard/extra infrastructure for slow path commands (SMP and |
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* internal lldd commands |
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*/ |
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struct timer_list timer; |
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struct completion completion; |
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struct sas_task *task; |
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}; |
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#define SAS_TASK_STATE_PENDING 1 |
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#define SAS_TASK_STATE_DONE 2 |
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#define SAS_TASK_STATE_ABORTED 4 |
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#define SAS_TASK_NEED_DEV_RESET 8 |
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#define SAS_TASK_AT_INITIATOR 16 |
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extern struct sas_task *sas_alloc_task(gfp_t flags); |
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extern struct sas_task *sas_alloc_slow_task(gfp_t flags); |
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extern void sas_free_task(struct sas_task *task); |
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struct sas_domain_function_template { |
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/* The class calls these to notify the LLDD of an event. */ |
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void (*lldd_port_formed)(struct asd_sas_phy *); |
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void (*lldd_port_deformed)(struct asd_sas_phy *); |
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/* The class calls these when a device is found or gone. */ |
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int (*lldd_dev_found)(struct domain_device *); |
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void (*lldd_dev_gone)(struct domain_device *); |
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int (*lldd_execute_task)(struct sas_task *, gfp_t gfp_flags); |
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/* Task Management Functions. Must be called from process context. */ |
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int (*lldd_abort_task)(struct sas_task *); |
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int (*lldd_abort_task_set)(struct domain_device *, u8 *lun); |
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int (*lldd_clear_aca)(struct domain_device *, u8 *lun); |
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int (*lldd_clear_task_set)(struct domain_device *, u8 *lun); |
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int (*lldd_I_T_nexus_reset)(struct domain_device *); |
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int (*lldd_ata_check_ready)(struct domain_device *); |
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void (*lldd_ata_set_dmamode)(struct domain_device *); |
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int (*lldd_lu_reset)(struct domain_device *, u8 *lun); |
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int (*lldd_query_task)(struct sas_task *); |
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/* Port and Adapter management */ |
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int (*lldd_clear_nexus_port)(struct asd_sas_port *); |
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int (*lldd_clear_nexus_ha)(struct sas_ha_struct *); |
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/* Phy management */ |
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int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *); |
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/* GPIO support */ |
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int (*lldd_write_gpio)(struct sas_ha_struct *, u8 reg_type, |
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u8 reg_index, u8 reg_count, u8 *write_data); |
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}; |
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extern int sas_register_ha(struct sas_ha_struct *); |
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extern int sas_unregister_ha(struct sas_ha_struct *); |
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extern void sas_prep_resume_ha(struct sas_ha_struct *sas_ha); |
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extern void sas_resume_ha(struct sas_ha_struct *sas_ha); |
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extern void sas_suspend_ha(struct sas_ha_struct *sas_ha); |
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int sas_set_phy_speed(struct sas_phy *phy, struct sas_phy_linkrates *rates); |
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int sas_phy_reset(struct sas_phy *phy, int hard_reset); |
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extern int sas_queuecommand(struct Scsi_Host *, struct scsi_cmnd *); |
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extern int sas_target_alloc(struct scsi_target *); |
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extern int sas_slave_configure(struct scsi_device *); |
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extern int sas_change_queue_depth(struct scsi_device *, int new_depth); |
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extern int sas_bios_param(struct scsi_device *, struct block_device *, |
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sector_t capacity, int *hsc); |
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extern struct scsi_transport_template * |
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sas_domain_attach_transport(struct sas_domain_function_template *); |
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extern struct device_attribute dev_attr_phy_event_threshold; |
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int sas_discover_root_expander(struct domain_device *); |
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void sas_init_ex_attr(void); |
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int sas_ex_revalidate_domain(struct domain_device *); |
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void sas_unregister_domain_devices(struct asd_sas_port *port, int gone); |
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void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *); |
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int sas_discover_event(struct asd_sas_port *, enum discover_event ev); |
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int sas_discover_sata(struct domain_device *); |
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int sas_discover_end_dev(struct domain_device *); |
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void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *); |
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void sas_init_dev(struct domain_device *); |
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void sas_task_abort(struct sas_task *); |
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int sas_eh_abort_handler(struct scsi_cmnd *cmd); |
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int sas_eh_device_reset_handler(struct scsi_cmnd *cmd); |
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int sas_eh_target_reset_handler(struct scsi_cmnd *cmd); |
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extern void sas_target_destroy(struct scsi_target *); |
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extern int sas_slave_alloc(struct scsi_device *); |
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extern int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, |
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void __user *arg); |
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extern int sas_drain_work(struct sas_ha_struct *ha); |
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extern void sas_ssp_task_response(struct device *dev, struct sas_task *task, |
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struct ssp_response_iu *iu); |
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struct sas_phy *sas_get_local_phy(struct domain_device *dev); |
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int sas_request_addr(struct Scsi_Host *shost, u8 *addr); |
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int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event, |
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gfp_t gfp_flags); |
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int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event, |
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gfp_t gfp_flags); |
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#endif /* _SASLIB_H_ */
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