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linux/drivers/scsi/mpt2sas/mpt2sas_ctl.h
Kashyap, Desai 0bdccdb0a0 [SCSI] mpt2sas : WarpDrive New product SSS6200 support added 
This patch has Support for the new solid state device product SSS6200
from LSI and relavent features w.r.t SSS6200.

The major feature added in this driver is supporting Direct-I/O to the
SSS6200 storage.There are some additional changes done to avoid exposing
the RAID member disks to the OS and hiding/exposing drives based on the
OEM Specific Flag in Manufacturing Page10 (this is required to handle
specific changes in the SSS6200 firmware).

Each and every changes are listed below.
1. Hiding IR related messages.
For SSS6200, the driver is modified not to print IR related events.
Even if the debugging is enabled the IR related messages will not be displayed.
In some places if there is a need to display a message related to IR the
string "IR" is replaced with string "DD" and the string "volume" is replaced
with "direct drive". But the function names are not changed hence there are
some places where the reference to volume can be seen if debug level is set.

2. Removed RAID transport support
In Linux the user can retrieve RAID volume information from the sysfs directory.
This support is removed for SSS6200.

3. Direct I/O support.
The driver tries to enable direct I/O when a volume is reported to the driver
by the firmware through IRCC events and the driver does this just before
reporting to the OS, hence all the OS issued I/O can go through direct path
if they can, The first validation is to see whether the manufacturing page10
flag is set to expose all drives always. If that is set, the driver will not
enable direct I/O and displays the message "DDIO" is disabled globally as
drives are exposed. The driver checks whether there is more than one volume
in the controller, if so the direct I/O will be disabled globally for all
volumes in the controller and the message displayed will be "DDIO is disabled
globally as number of drives > 1.
If retrieving number of PD is failed the driver will not enable direct I/O
and displays the message Failure in computing number of drives DDIO disabled.
If memory allocation for RAIDVolumePage0 is failed, the driver will not enable
direct I/O and displays the message Memory allocation failure for
RVPG0 DDIO disabled.  If retrieving RAIDVolumePage0 is failed the driver will
not enable direct I/O and displays the message Failure in retrieving
RVPG0 DDIO disabled

If the number of PD in a volume is greater than 8, then the direct I/O will
be disabled.
If any of individual drives handle retrieval is failed then the DD-IO will
be disabled.
If the volume is not RAID0 or if the block size is not 512 then the DD-IO will
be disabled.
If the volume size is greater than 2TB then the DD-IO will be disabled.
If the driver is not able to find a valid stripe exponent using the configured
stripe size then the DD-IO will be disabled

When the DD-IO is enabled the driver will check every I/O request issued to
the storage and checks whether the request is either
READ6/WRITE6/READ10/WRITE10, if it is and if the complete I/O transfer
is within a stripe size then the I/O is redirected to
the drive directly instead of the volume.

On completion of every I/O, if the completion is failure means if the reply
is address reply with a reply frame associated with it, then the type of I/O
will be checked, if the I/O is direct then the I/O will be retried to
the volume once.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Reviewed-by: Eric Moore <eric.moore@lsi.com>
Reviewed-by: Sathya Prakash <sathya.prakash@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2011-05-01 10:36:54 -05:00

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/*
* Management Module Support for MPT (Message Passing Technology) based
* controllers
*
* This code is based on drivers/scsi/mpt2sas/mpt2_ctl.h
* Copyright (C) 2007-2010 LSI Corporation
* (mailto:DL-MPTFusionLinux@lsi.com)
*
* 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.
*
* NO WARRANTY
* THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
* LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
* solely responsible for determining the appropriateness of using and
* distributing the Program and assumes all risks associated with its
* exercise of rights under this Agreement, including but not limited to
* the risks and costs of program errors, damage to or loss of data,
* programs or equipment, and unavailability or interruption of operations.
* DISCLAIMER OF LIABILITY
* NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
* HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
* 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 Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#ifndef MPT2SAS_CTL_H_INCLUDED
#define MPT2SAS_CTL_H_INCLUDED
#ifdef __KERNEL__
#include <linux/miscdevice.h>
#endif
#define MPT2SAS_DEV_NAME "mpt2ctl"
#define MPT2_MAGIC_NUMBER 'L'
#define MPT2_IOCTL_DEFAULT_TIMEOUT (10) /* in seconds */
/**
* IOCTL opcodes
*/
#define MPT2IOCINFO _IOWR(MPT2_MAGIC_NUMBER, 17, \
struct mpt2_ioctl_iocinfo)
#define MPT2COMMAND _IOWR(MPT2_MAGIC_NUMBER, 20, \
struct mpt2_ioctl_command)
#ifdef CONFIG_COMPAT
#define MPT2COMMAND32 _IOWR(MPT2_MAGIC_NUMBER, 20, \
struct mpt2_ioctl_command32)
#endif
#define MPT2EVENTQUERY _IOWR(MPT2_MAGIC_NUMBER, 21, \
struct mpt2_ioctl_eventquery)
#define MPT2EVENTENABLE _IOWR(MPT2_MAGIC_NUMBER, 22, \
struct mpt2_ioctl_eventenable)
#define MPT2EVENTREPORT _IOWR(MPT2_MAGIC_NUMBER, 23, \
struct mpt2_ioctl_eventreport)
#define MPT2HARDRESET _IOWR(MPT2_MAGIC_NUMBER, 24, \
struct mpt2_ioctl_diag_reset)
#define MPT2BTDHMAPPING _IOWR(MPT2_MAGIC_NUMBER, 31, \
struct mpt2_ioctl_btdh_mapping)
/* diag buffer support */
#define MPT2DIAGREGISTER _IOWR(MPT2_MAGIC_NUMBER, 26, \
struct mpt2_diag_register)
#define MPT2DIAGRELEASE _IOWR(MPT2_MAGIC_NUMBER, 27, \
struct mpt2_diag_release)
#define MPT2DIAGUNREGISTER _IOWR(MPT2_MAGIC_NUMBER, 28, \
struct mpt2_diag_unregister)
#define MPT2DIAGQUERY _IOWR(MPT2_MAGIC_NUMBER, 29, \
struct mpt2_diag_query)
#define MPT2DIAGREADBUFFER _IOWR(MPT2_MAGIC_NUMBER, 30, \
struct mpt2_diag_read_buffer)
/**
* struct mpt2_ioctl_header - main header structure
* @ioc_number - IOC unit number
* @port_number - IOC port number
* @max_data_size - maximum number bytes to transfer on read
*/
struct mpt2_ioctl_header {
uint32_t ioc_number;
uint32_t port_number;
uint32_t max_data_size;
};
/**
* struct mpt2_ioctl_diag_reset - diagnostic reset
* @hdr - generic header
*/
struct mpt2_ioctl_diag_reset {
struct mpt2_ioctl_header hdr;
};
/**
* struct mpt2_ioctl_pci_info - pci device info
* @device - pci device id
* @function - pci function id
* @bus - pci bus id
* @segment_id - pci segment id
*/
struct mpt2_ioctl_pci_info {
union {
struct {
uint32_t device:5;
uint32_t function:3;
uint32_t bus:24;
} bits;
uint32_t word;
} u;
uint32_t segment_id;
};
#define MPT2_IOCTL_INTERFACE_SCSI (0x00)
#define MPT2_IOCTL_INTERFACE_FC (0x01)
#define MPT2_IOCTL_INTERFACE_FC_IP (0x02)
#define MPT2_IOCTL_INTERFACE_SAS (0x03)
#define MPT2_IOCTL_INTERFACE_SAS2 (0x04)
#define MPT2_IOCTL_INTERFACE_SAS2_SSS6200 (0x05)
#define MPT2_IOCTL_VERSION_LENGTH (32)
/**
* struct mpt2_ioctl_iocinfo - generic controller info
* @hdr - generic header
* @adapter_type - type of adapter (spi, fc, sas)
* @port_number - port number
* @pci_id - PCI Id
* @hw_rev - hardware revision
* @sub_system_device - PCI subsystem Device ID
* @sub_system_vendor - PCI subsystem Vendor ID
* @rsvd0 - reserved
* @firmware_version - firmware version
* @bios_version - BIOS version
* @driver_version - driver version - 32 ASCII characters
* @rsvd1 - reserved
* @scsi_id - scsi id of adapter 0
* @rsvd2 - reserved
* @pci_information - pci info (2nd revision)
*/
struct mpt2_ioctl_iocinfo {
struct mpt2_ioctl_header hdr;
uint32_t adapter_type;
uint32_t port_number;
uint32_t pci_id;
uint32_t hw_rev;
uint32_t subsystem_device;
uint32_t subsystem_vendor;
uint32_t rsvd0;
uint32_t firmware_version;
uint32_t bios_version;
uint8_t driver_version[MPT2_IOCTL_VERSION_LENGTH];
uint8_t rsvd1;
uint8_t scsi_id;
uint16_t rsvd2;
struct mpt2_ioctl_pci_info pci_information;
};
/* number of event log entries */
#define MPT2SAS_CTL_EVENT_LOG_SIZE (50)
/**
* struct mpt2_ioctl_eventquery - query event count and type
* @hdr - generic header
* @event_entries - number of events returned by get_event_report
* @rsvd - reserved
* @event_types - type of events currently being captured
*/
struct mpt2_ioctl_eventquery {
struct mpt2_ioctl_header hdr;
uint16_t event_entries;
uint16_t rsvd;
uint32_t event_types[MPI2_EVENT_NOTIFY_EVENTMASK_WORDS];
};
/**
* struct mpt2_ioctl_eventenable - enable/disable event capturing
* @hdr - generic header
* @event_types - toggle off/on type of events to be captured
*/
struct mpt2_ioctl_eventenable {
struct mpt2_ioctl_header hdr;
uint32_t event_types[4];
};
#define MPT2_EVENT_DATA_SIZE (192)
/**
* struct MPT2_IOCTL_EVENTS -
* @event - the event that was reported
* @context - unique value for each event assigned by driver
* @data - event data returned in fw reply message
*/
struct MPT2_IOCTL_EVENTS {
uint32_t event;
uint32_t context;
uint8_t data[MPT2_EVENT_DATA_SIZE];
};
/**
* struct mpt2_ioctl_eventreport - returing event log
* @hdr - generic header
* @event_data - (see struct MPT2_IOCTL_EVENTS)
*/
struct mpt2_ioctl_eventreport {
struct mpt2_ioctl_header hdr;
struct MPT2_IOCTL_EVENTS event_data[1];
};
/**
* struct mpt2_ioctl_command - generic mpt firmware passthru ioclt
* @hdr - generic header
* @timeout - command timeout in seconds. (if zero then use driver default
* value).
* @reply_frame_buf_ptr - reply location
* @data_in_buf_ptr - destination for read
* @data_out_buf_ptr - data source for write
* @sense_data_ptr - sense data location
* @max_reply_bytes - maximum number of reply bytes to be sent to app.
* @data_in_size - number bytes for data transfer in (read)
* @data_out_size - number bytes for data transfer out (write)
* @max_sense_bytes - maximum number of bytes for auto sense buffers
* @data_sge_offset - offset in words from the start of the request message to
* the first SGL
* @mf[1];
*/
struct mpt2_ioctl_command {
struct mpt2_ioctl_header hdr;
uint32_t timeout;
void __user *reply_frame_buf_ptr;
void __user *data_in_buf_ptr;
void __user *data_out_buf_ptr;
void __user *sense_data_ptr;
uint32_t max_reply_bytes;
uint32_t data_in_size;
uint32_t data_out_size;
uint32_t max_sense_bytes;
uint32_t data_sge_offset;
uint8_t mf[1];
};
#ifdef CONFIG_COMPAT
struct mpt2_ioctl_command32 {
struct mpt2_ioctl_header hdr;
uint32_t timeout;
uint32_t reply_frame_buf_ptr;
uint32_t data_in_buf_ptr;
uint32_t data_out_buf_ptr;
uint32_t sense_data_ptr;
uint32_t max_reply_bytes;
uint32_t data_in_size;
uint32_t data_out_size;
uint32_t max_sense_bytes;
uint32_t data_sge_offset;
uint8_t mf[1];
};
#endif
/**
* struct mpt2_ioctl_btdh_mapping - mapping info
* @hdr - generic header
* @id - target device identification number
* @bus - SCSI bus number that the target device exists on
* @handle - device handle for the target device
* @rsvd - reserved
*
* To obtain a bus/id the application sets
* handle to valid handle, and bus/id to 0xFFFF.
*
* To obtain the device handle the application sets
* bus/id valid value, and the handle to 0xFFFF.
*/
struct mpt2_ioctl_btdh_mapping {
struct mpt2_ioctl_header hdr;
uint32_t id;
uint32_t bus;
uint16_t handle;
uint16_t rsvd;
};
/* status bits for ioc->diag_buffer_status */
#define MPT2_DIAG_BUFFER_IS_REGISTERED (0x01)
#define MPT2_DIAG_BUFFER_IS_RELEASED (0x02)
#define MPT2_DIAG_BUFFER_IS_DIAG_RESET (0x04)
/* application flags for mpt2_diag_register, mpt2_diag_query */
#define MPT2_APP_FLAGS_APP_OWNED (0x0001)
#define MPT2_APP_FLAGS_BUFFER_VALID (0x0002)
#define MPT2_APP_FLAGS_FW_BUFFER_ACCESS (0x0004)
/* flags for mpt2_diag_read_buffer */
#define MPT2_FLAGS_REREGISTER (0x0001)
#define MPT2_PRODUCT_SPECIFIC_DWORDS 23
/**
* struct mpt2_diag_register - application register with driver
* @hdr - generic header
* @reserved -
* @buffer_type - specifies either TRACE, SNAPSHOT, or EXTENDED
* @application_flags - misc flags
* @diagnostic_flags - specifies flags affecting command processing
* @product_specific - product specific information
* @requested_buffer_size - buffers size in bytes
* @unique_id - tag specified by application that is used to signal ownership
* of the buffer.
*
* This will allow the driver to setup any required buffers that will be
* needed by firmware to communicate with the driver.
*/
struct mpt2_diag_register {
struct mpt2_ioctl_header hdr;
uint8_t reserved;
uint8_t buffer_type;
uint16_t application_flags;
uint32_t diagnostic_flags;
uint32_t product_specific[MPT2_PRODUCT_SPECIFIC_DWORDS];
uint32_t requested_buffer_size;
uint32_t unique_id;
};
/**
* struct mpt2_diag_unregister - application unregister with driver
* @hdr - generic header
* @unique_id - tag uniquely identifies the buffer to be unregistered
*
* This will allow the driver to cleanup any memory allocated for diag
* messages and to free up any resources.
*/
struct mpt2_diag_unregister {
struct mpt2_ioctl_header hdr;
uint32_t unique_id;
};
/**
* struct mpt2_diag_query - query relevant info associated with diag buffers
* @hdr - generic header
* @reserved -
* @buffer_type - specifies either TRACE, SNAPSHOT, or EXTENDED
* @application_flags - misc flags
* @diagnostic_flags - specifies flags affecting command processing
* @product_specific - product specific information
* @total_buffer_size - diag buffer size in bytes
* @driver_added_buffer_size - size of extra space appended to end of buffer
* @unique_id - unique id associated with this buffer.
*
* The application will send only buffer_type and unique_id. Driver will
* inspect unique_id first, if valid, fill in all the info. If unique_id is
* 0x00, the driver will return info specified by Buffer Type.
*/
struct mpt2_diag_query {
struct mpt2_ioctl_header hdr;
uint8_t reserved;
uint8_t buffer_type;
uint16_t application_flags;
uint32_t diagnostic_flags;
uint32_t product_specific[MPT2_PRODUCT_SPECIFIC_DWORDS];
uint32_t total_buffer_size;
uint32_t driver_added_buffer_size;
uint32_t unique_id;
};
/**
* struct mpt2_diag_release - request to send Diag Release Message to firmware
* @hdr - generic header
* @unique_id - tag uniquely identifies the buffer to be released
*
* This allows ownership of the specified buffer to returned to the driver,
* allowing an application to read the buffer without fear that firmware is
* overwritting information in the buffer.
*/
struct mpt2_diag_release {
struct mpt2_ioctl_header hdr;
uint32_t unique_id;
};
/**
* struct mpt2_diag_read_buffer - request for copy of the diag buffer
* @hdr - generic header
* @status -
* @reserved -
* @flags - misc flags
* @starting_offset - starting offset within drivers buffer where to start
* reading data at into the specified application buffer
* @bytes_to_read - number of bytes to copy from the drivers buffer into the
* application buffer starting at starting_offset.
* @unique_id - unique id associated with this buffer.
* @diagnostic_data - data payload
*/
struct mpt2_diag_read_buffer {
struct mpt2_ioctl_header hdr;
uint8_t status;
uint8_t reserved;
uint16_t flags;
uint32_t starting_offset;
uint32_t bytes_to_read;
uint32_t unique_id;
uint32_t diagnostic_data[1];
};
#endif /* MPT2SAS_CTL_H_INCLUDED */
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