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linux/drivers/scsi/isci/host.h

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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SCI_HOST_H_
#define _SCI_HOST_H_
#include "remote_device.h"
#include "phy.h"
#include "pool.h"
#include "state_machine.h"
#include "remote_node_table.h"
#include "registers.h"
#include "scu_unsolicited_frame.h"
#include "unsolicited_frame_control.h"
#include "probe_roms.h"
struct scic_sds_request;
struct scu_task_context;
/**
* struct scic_power_control -
*
* This structure defines the fields for managing power control for direct
* attached disk devices.
*/
struct scic_power_control {
/**
* This field is set when the power control timer is running and cleared when
* it is not.
*/
bool timer_started;
/**
* This field is the handle to the driver timer object. This timer is used to
* control when the directed attached disks can consume power.
*/
void *timer;
/**
* This field is used to keep track of how many phys are put into the
* requesters field.
*/
u8 phys_waiting;
/**
* This field is used to keep track of how many phys have been granted to consume power
*/
u8 phys_granted_power;
/**
* This field is an array of phys that we are waiting on. The phys are direct
* mapped into requesters via struct scic_sds_phy.phy_index
*/
struct scic_sds_phy *requesters[SCI_MAX_PHYS];
};
struct scic_sds_port_configuration_agent;
typedef void (*port_config_fn)(struct scic_sds_controller *,
struct scic_sds_port_configuration_agent *,
struct scic_sds_port *, struct scic_sds_phy *);
struct scic_sds_port_configuration_agent {
u16 phy_configured_mask;
u16 phy_ready_mask;
struct {
u8 min_index;
u8 max_index;
} phy_valid_port_range[SCI_MAX_PHYS];
bool timer_pending;
port_config_fn link_up_handler;
port_config_fn link_down_handler;
void *timer;
};
/**
* struct scic_sds_controller -
*
* This structure represents the SCU controller object.
*/
struct scic_sds_controller {
/**
* This field contains the information for the base controller state
* machine.
*/
struct sci_base_state_machine state_machine;
/**
* This field is the driver timer object handler used to time the controller
* object start and stop requests.
*/
void *timeout_timer;
/**
* This field contains the user parameters to be utilized for this
* core controller object.
*/
union scic_user_parameters user_parameters;
/**
* This field contains the OEM parameters to be utilized for this
* core controller object.
*/
union scic_oem_parameters oem_parameters;
/**
* This field contains the port configuration agent for this controller.
*/
struct scic_sds_port_configuration_agent port_agent;
/**
* This field is the array of device objects that are currently constructed
* for this controller object. This table is used as a fast lookup of device
* objects that need to handle device completion notifications from the
* hardware. The table is RNi based.
*/
struct scic_sds_remote_device *device_table[SCI_MAX_REMOTE_DEVICES];
/**
* This field is the array of IO request objects that are currently active for
* this controller object. This table is used as a fast lookup of the io
* request object that need to handle completion queue notifications. The
* table is TCi based.
*/
struct scic_sds_request *io_request_table[SCI_MAX_IO_REQUESTS];
/**
* This field is the free RNi data structure
*/
struct scic_remote_node_table available_remote_nodes;
/**
* This field is the TCi pool used to manage the task context index.
*/
SCI_POOL_CREATE(tci_pool, u16, SCI_MAX_IO_REQUESTS);
/**
* This filed is the struct scic_power_control data used to controll when direct
* attached devices can consume power.
*/
struct scic_power_control power_control;
/**
* This field is the array of sequence values for the IO Tag fields. Even
* though only 4 bits of the field is used for the sequence the sequence is 16
* bits in size so the sequence can be bitwise or'd with the TCi to build the
* IO Tag value.
*/
u16 io_request_sequence[SCI_MAX_IO_REQUESTS];
/**
* This field in the array of sequence values for the RNi. These are used
* to control io request build to io request start operations. The sequence
* value is recorded into an io request when it is built and is checked on
* the io request start operation to make sure that there was not a device
* hot plug between the build and start operation.
*/
u8 remote_device_sequence[SCI_MAX_REMOTE_DEVICES];
/**
* This field is a pointer to the memory allocated by the driver for the task
* context table. This data is shared between the hardware and software.
*/
struct scu_task_context *task_context_table;
/**
* This field is a pointer to the memory allocated by the driver for the
* remote node context table. This table is shared between the hardware and
* software.
*/
union scu_remote_node_context *remote_node_context_table;
/**
* This field is a pointer to the completion queue. This memory is
* written to by the hardware and read by the software.
*/
u32 *completion_queue;
/**
* This field is the software copy of the completion queue get pointer. The
* controller object writes this value to the hardware after processing the
* completion entries.
*/
u32 completion_queue_get;
/**
* This field is the minimum of the number of hardware supported port entries
* and the software requested port entries.
*/
u32 logical_port_entries;
/**
* This field is the minimum number of hardware supported completion queue
* entries and the software requested completion queue entries.
*/
u32 completion_queue_entries;
/**
* This field is the minimum number of hardware supported event entries and
* the software requested event entries.
*/
u32 completion_event_entries;
/**
* This field is the minimum number of devices supported by the hardware and
* the number of devices requested by the software.
*/
u32 remote_node_entries;
/**
* This field is the minimum number of IO requests supported by the hardware
* and the number of IO requests requested by the software.
*/
u32 task_context_entries;
/**
* This object contains all of the unsolicited frame specific
* data utilized by the core controller.
*/
struct scic_sds_unsolicited_frame_control uf_control;
/* Phy Startup Data */
/**
* This field is the driver timer handle for controller phy request startup.
* On controller start the controller will start each PHY individually in
* order of phy index.
*/
void *phy_startup_timer;
/**
* This field is set when the phy_startup_timer is running and is cleared when
* the phy_startup_timer is stopped.
*/
bool phy_startup_timer_pending;
/**
* This field is the index of the next phy start. It is initialized to 0 and
* increments for each phy index that is started.
*/
u32 next_phy_to_start;
/**
* This field controlls the invalid link up notifications to the SCI_USER. If
* an invalid_link_up notification is reported a bit for the PHY index is set
* so further notifications are not made. Once the PHY object reports link up
* and is made part of a port then this bit for the PHY index is cleared.
*/
u8 invalid_phy_mask;
/*
* This field saves the current interrupt coalescing number of the controller.
*/
u16 interrupt_coalesce_number;
/*
* This field saves the current interrupt coalescing timeout value in microseconds.
*/
u32 interrupt_coalesce_timeout;
/**
* This field is a pointer to the memory mapped register space for the
* struct smu_registers.
*/
struct smu_registers __iomem *smu_registers;
/**
* This field is a pointer to the memory mapped register space for the
* struct scu_registers.
*/
struct scu_registers __iomem *scu_registers;
};
struct isci_host {
struct scic_sds_controller sci;
union scic_oem_parameters oem_parameters;
int id; /* unique within a given pci device */
struct list_head timers;
void *core_ctrl_memory;
struct dma_pool *dma_pool;
struct isci_phy phys[SCI_MAX_PHYS];
struct isci_port ports[SCI_MAX_PORTS + 1]; /* includes dummy port */
struct sas_ha_struct sas_ha;
int can_queue;
spinlock_t queue_lock;
spinlock_t state_lock;
struct pci_dev *pdev;
enum isci_status status;
#define IHOST_START_PENDING 0
#define IHOST_STOP_PENDING 1
unsigned long flags;
wait_queue_head_t eventq;
struct Scsi_Host *shost;
struct tasklet_struct completion_tasklet;
struct list_head requests_to_complete;
struct list_head requests_to_errorback;
spinlock_t scic_lock;
struct isci_remote_device devices[SCI_MAX_REMOTE_DEVICES];
};
/**
* enum scic_sds_controller_states - This enumeration depicts all the states
* for the common controller state machine.
*/
enum scic_sds_controller_states {
/**
* Simply the initial state for the base controller state machine.
*/
SCI_BASE_CONTROLLER_STATE_INITIAL = 0,
/**
* This state indicates that the controller is reset. The memory for
* the controller is in it's initial state, but the controller requires
* initialization.
* This state is entered from the INITIAL state.
* This state is entered from the RESETTING state.
*/
SCI_BASE_CONTROLLER_STATE_RESET,
/**
* This state is typically an action state that indicates the controller
* is in the process of initialization. In this state no new IO operations
* are permitted.
* This state is entered from the RESET state.
*/
SCI_BASE_CONTROLLER_STATE_INITIALIZING,
/**
* This state indicates that the controller has been successfully
* initialized. In this state no new IO operations are permitted.
* This state is entered from the INITIALIZING state.
*/
SCI_BASE_CONTROLLER_STATE_INITIALIZED,
/**
* This state indicates the the controller is in the process of becoming
* ready (i.e. starting). In this state no new IO operations are permitted.
* This state is entered from the INITIALIZED state.
*/
SCI_BASE_CONTROLLER_STATE_STARTING,
/**
* This state indicates the controller is now ready. Thus, the user
* is able to perform IO operations on the controller.
* This state is entered from the STARTING state.
*/
SCI_BASE_CONTROLLER_STATE_READY,
/**
* This state is typically an action state that indicates the controller
* is in the process of resetting. Thus, the user is unable to perform
* IO operations on the controller. A reset is considered destructive in
* most cases.
* This state is entered from the READY state.
* This state is entered from the FAILED state.
* This state is entered from the STOPPED state.
*/
SCI_BASE_CONTROLLER_STATE_RESETTING,
/**
* This state indicates that the controller is in the process of stopping.
* In this state no new IO operations are permitted, but existing IO
* operations are allowed to complete.
* This state is entered from the READY state.
*/
SCI_BASE_CONTROLLER_STATE_STOPPING,
/**
* This state indicates that the controller has successfully been stopped.
* In this state no new IO operations are permitted.
* This state is entered from the STOPPING state.
*/
SCI_BASE_CONTROLLER_STATE_STOPPED,
/**
* This state indicates that the controller could not successfully be
* initialized. In this state no new IO operations are permitted.
* This state is entered from the INITIALIZING state.
* This state is entered from the STARTING state.
* This state is entered from the STOPPING state.
* This state is entered from the RESETTING state.
*/
SCI_BASE_CONTROLLER_STATE_FAILED,
SCI_BASE_CONTROLLER_MAX_STATES
};
/**
* struct isci_pci_info - This class represents the pci function containing the
* controllers. Depending on PCI SKU, there could be up to 2 controllers in
* the PCI function.
*/
#define SCI_MAX_MSIX_INT (SCI_NUM_MSI_X_INT*SCI_MAX_CONTROLLERS)
struct isci_pci_info {
struct msix_entry msix_entries[SCI_MAX_MSIX_INT];
struct isci_host *hosts[SCI_MAX_CONTROLLERS];
struct isci_orom *orom;
};
static inline struct isci_pci_info *to_pci_info(struct pci_dev *pdev)
{
return pci_get_drvdata(pdev);
}
#define for_each_isci_host(id, ihost, pdev) \
for (id = 0, ihost = to_pci_info(pdev)->hosts[id]; \
id < ARRAY_SIZE(to_pci_info(pdev)->hosts) && ihost; \
ihost = to_pci_info(pdev)->hosts[++id])
static inline enum isci_status isci_host_get_state(struct isci_host *isci_host)
{
return isci_host->status;
}
static inline void isci_host_change_state(struct isci_host *isci_host,
enum isci_status status)
{
unsigned long flags;
dev_dbg(&isci_host->pdev->dev,
"%s: isci_host = %p, state = 0x%x",
__func__,
isci_host,
status);
spin_lock_irqsave(&isci_host->state_lock, flags);
isci_host->status = status;
spin_unlock_irqrestore(&isci_host->state_lock, flags);
}
static inline int isci_host_can_queue(struct isci_host *isci_host, int num)
{
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&isci_host->queue_lock, flags);
if ((isci_host->can_queue - num) < 0) {
dev_dbg(&isci_host->pdev->dev,
"%s: isci_host->can_queue = %d\n",
__func__,
isci_host->can_queue);
ret = -SAS_QUEUE_FULL;
} else
isci_host->can_queue -= num;
spin_unlock_irqrestore(&isci_host->queue_lock, flags);
return ret;
}
static inline void isci_host_can_dequeue(struct isci_host *isci_host, int num)
{
unsigned long flags;
spin_lock_irqsave(&isci_host->queue_lock, flags);
isci_host->can_queue += num;
spin_unlock_irqrestore(&isci_host->queue_lock, flags);
}
static inline void wait_for_start(struct isci_host *ihost)
{
wait_event(ihost->eventq, !test_bit(IHOST_START_PENDING, &ihost->flags));
}
static inline void wait_for_stop(struct isci_host *ihost)
{
wait_event(ihost->eventq, !test_bit(IHOST_STOP_PENDING, &ihost->flags));
}
static inline void wait_for_device_start(struct isci_host *ihost, struct isci_remote_device *idev)
{
wait_event(ihost->eventq, !test_bit(IDEV_START_PENDING, &idev->flags));
}
static inline void wait_for_device_stop(struct isci_host *ihost, struct isci_remote_device *idev)
{
wait_event(ihost->eventq, !test_bit(IDEV_STOP_PENDING, &idev->flags));
}
static inline struct isci_host *dev_to_ihost(struct domain_device *dev)
{
return dev->port->ha->lldd_ha;
}
static inline struct isci_host *scic_to_ihost(struct scic_sds_controller *scic)
{
/* XXX delete after merging scic_sds_contoller and isci_host */
struct isci_host *ihost = container_of(scic, typeof(*ihost), sci);
return ihost;
}
/**
* INCREMENT_QUEUE_GET() -
*
* This macro will increment the specified index to and if the index wraps to 0
* it will toggel the cycle bit.
*/
#define INCREMENT_QUEUE_GET(index, cycle, entry_count, bit_toggle) \
{ \
if ((index) + 1 == entry_count) { \
(index) = 0; \
(cycle) = (cycle) ^ (bit_toggle); \
} else { \
index = index + 1; \
} \
}
/**
* scic_sds_controller_get_port_configuration_agent() -
*
* This is a helper macro to get the port configuration agent from the
* controller object.
*/
#define scic_sds_controller_get_port_configuration_agent(controller) \
(&(controller)->port_agent)
/**
* scic_sds_controller_get_protocol_engine_group() -
*
* This macro returns the protocol engine group for this controller object.
* Presently we only support protocol engine group 0 so just return that
*/
#define scic_sds_controller_get_protocol_engine_group(controller) 0
/**
* scic_sds_io_tag_construct() -
*
* This macro constructs an IO tag from the sequence and index values.
*/
#define scic_sds_io_tag_construct(sequence, task_index) \
((sequence) << 12 | (task_index))
/**
* scic_sds_io_tag_get_sequence() -
*
* This macro returns the IO sequence from the IO tag value.
*/
#define scic_sds_io_tag_get_sequence(io_tag) \
(((io_tag) & 0xF000) >> 12)
/**
* scic_sds_io_tag_get_index() -
*
* This macro returns the TCi from the io tag value
*/
#define scic_sds_io_tag_get_index(io_tag) \
((io_tag) & 0x0FFF)
/**
* scic_sds_io_sequence_increment() -
*
* This is a helper macro to increment the io sequence count. We may find in
* the future that it will be faster to store the sequence count in such a way
* as we dont perform the shift operation to build io tag values so therefore
* need a way to incrment them correctly
*/
#define scic_sds_io_sequence_increment(value) \
((value) = (((value) + 1) & 0x000F))
/* expander attached sata devices require 3 rnc slots */
static inline int scic_sds_remote_device_node_count(struct scic_sds_remote_device *sci_dev)
{
struct domain_device *dev = sci_dev_to_domain(sci_dev);
if ((dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) &&
!sci_dev->is_direct_attached)
return SCU_STP_REMOTE_NODE_COUNT;
return SCU_SSP_REMOTE_NODE_COUNT;
}
/**
* scic_sds_controller_set_invalid_phy() -
*
* This macro will set the bit in the invalid phy mask for this controller
* object. This is used to control messages reported for invalid link up
* notifications.
*/
#define scic_sds_controller_set_invalid_phy(controller, phy) \
((controller)->invalid_phy_mask |= (1 << (phy)->phy_index))
/**
* scic_sds_controller_clear_invalid_phy() -
*
* This macro will clear the bit in the invalid phy mask for this controller
* object. This is used to control messages reported for invalid link up
* notifications.
*/
#define scic_sds_controller_clear_invalid_phy(controller, phy) \
((controller)->invalid_phy_mask &= ~(1 << (phy)->phy_index))
static inline struct device *scic_to_dev(struct scic_sds_controller *scic)
{
return &scic_to_ihost(scic)->pdev->dev;
}
static inline struct device *sciphy_to_dev(struct scic_sds_phy *sci_phy)
{
struct isci_phy *iphy = sci_phy_to_iphy(sci_phy);
if (!iphy || !iphy->isci_port || !iphy->isci_port->isci_host)
return NULL;
return &iphy->isci_port->isci_host->pdev->dev;
}
static inline struct device *sciport_to_dev(struct scic_sds_port *sci_port)
{
struct isci_port *iport = sci_port_to_iport(sci_port);
if (!iport || !iport->isci_host)
return NULL;
return &iport->isci_host->pdev->dev;
}
static inline struct device *scirdev_to_dev(struct scic_sds_remote_device *sci_dev)
{
struct isci_remote_device *idev =
container_of(sci_dev, typeof(*idev), sci);
if (!idev || !idev->isci_port || !idev->isci_port->isci_host)
return NULL;
return &idev->isci_port->isci_host->pdev->dev;
}
enum {
ISCI_SI_REVA0,
ISCI_SI_REVA2,
ISCI_SI_REVB0,
};
extern int isci_si_rev;
static inline bool is_a0(void)
{
return isci_si_rev == ISCI_SI_REVA0;
}
static inline bool is_a2(void)
{
return isci_si_rev == ISCI_SI_REVA2;
}
static inline bool is_b0(void)
{
return isci_si_rev > ISCI_SI_REVA2;
}
void scic_sds_controller_post_request(struct scic_sds_controller *scic,
u32 request);
void scic_sds_controller_release_frame(struct scic_sds_controller *scic,
u32 frame_index);
void scic_sds_controller_copy_sata_response(void *response_buffer,
void *frame_header,
void *frame_buffer);
enum sci_status scic_sds_controller_allocate_remote_node_context(struct scic_sds_controller *scic,
struct scic_sds_remote_device *sci_dev,
u16 *node_id);
void scic_sds_controller_free_remote_node_context(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *sci_dev,
u16 node_id);
union scu_remote_node_context *scic_sds_controller_get_remote_node_context_buffer(
struct scic_sds_controller *scic,
u16 node_id);
struct scic_sds_request *scic_request_by_tag(struct scic_sds_controller *scic,
u16 io_tag);
struct scu_task_context *scic_sds_controller_get_task_context_buffer(
struct scic_sds_controller *scic,
u16 io_tag);
void scic_sds_controller_power_control_queue_insert(
struct scic_sds_controller *scic,
struct scic_sds_phy *sci_phy);
void scic_sds_controller_power_control_queue_remove(
struct scic_sds_controller *scic,
struct scic_sds_phy *sci_phy);
void scic_sds_controller_link_up(
struct scic_sds_controller *scic,
struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy);
void scic_sds_controller_link_down(
struct scic_sds_controller *scic,
struct scic_sds_port *sci_port,
struct scic_sds_phy *sci_phy);
void scic_sds_controller_remote_device_stopped(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *sci_dev);
void scic_sds_controller_copy_task_context(
struct scic_sds_controller *scic,
struct scic_sds_request *this_request);
void scic_sds_controller_register_setup(struct scic_sds_controller *scic);
enum sci_status scic_controller_continue_io(struct scic_sds_request *sci_req);
int isci_host_scan_finished(struct Scsi_Host *, unsigned long);
void isci_host_scan_start(struct Scsi_Host *);
int isci_host_init(struct isci_host *);
void isci_host_init_controller_names(
struct isci_host *isci_host,
unsigned int controller_idx);
void isci_host_deinit(
struct isci_host *);
void isci_host_port_link_up(
struct isci_host *,
struct scic_sds_port *,
struct scic_sds_phy *);
int isci_host_dev_found(struct domain_device *);
void isci_host_remote_device_start_complete(
struct isci_host *,
struct isci_remote_device *,
enum sci_status);
void scic_controller_disable_interrupts(
struct scic_sds_controller *scic);
enum sci_status scic_controller_start_io(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *remote_device,
struct scic_sds_request *io_request,
u16 io_tag);
enum sci_task_status scic_controller_start_task(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *remote_device,
struct scic_sds_request *task_request,
u16 io_tag);
enum sci_status scic_controller_terminate_request(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *remote_device,
struct scic_sds_request *request);
enum sci_status scic_controller_complete_io(
struct scic_sds_controller *scic,
struct scic_sds_remote_device *remote_device,
struct scic_sds_request *io_request);
u16 scic_controller_allocate_io_tag(
struct scic_sds_controller *scic);
enum sci_status scic_controller_free_io_tag(
struct scic_sds_controller *scic,
u16 io_tag);
void scic_sds_port_configuration_agent_construct(
struct scic_sds_port_configuration_agent *port_agent);
enum sci_status scic_sds_port_configuration_agent_initialize(
struct scic_sds_controller *controller,
struct scic_sds_port_configuration_agent *port_agent);
#endif
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