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Diffstat (limited to 'drivers/scsi/isci/request.h')
| -rw-r--r-- | drivers/scsi/isci/request.h | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/drivers/scsi/isci/request.h b/drivers/scsi/isci/request.h new file mode 100644 index 000000000000..7a1d5a9778eb --- /dev/null +++ b/drivers/scsi/isci/request.h @@ -0,0 +1,448 @@ +/* + * 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 _ISCI_REQUEST_H_ +#define _ISCI_REQUEST_H_ + +#include "isci.h" +#include "host.h" +#include "scu_task_context.h" + +/** + * struct isci_request_status - This enum defines the possible states of an I/O + * request. + * + * + */ +enum isci_request_status { + unallocated = 0x00, + allocated = 0x01, + started = 0x02, + completed = 0x03, + aborting = 0x04, + aborted = 0x05, + terminating = 0x06, + dead = 0x07 +}; + +enum task_type { + io_task = 0, + tmf_task = 1 +}; + +enum sci_request_protocol { + SCIC_NO_PROTOCOL, + SCIC_SMP_PROTOCOL, + SCIC_SSP_PROTOCOL, + SCIC_STP_PROTOCOL +}; /* XXX remove me, use sas_task.{dev|task_proto} instead */; + +/** + * isci_stp_request - extra request infrastructure to handle pio/atapi protocol + * @pio_len - number of bytes requested at PIO setup + * @status - pio setup ending status value to tell us if we need + * to wait for another fis or if the transfer is complete. Upon + * receipt of a d2h fis this will be the status field of that fis. + * @sgl - track pio transfer progress as we iterate through the sgl + * @device_cdb_len - atapi device advertises it's transfer constraints at setup + */ +struct isci_stp_request { + u32 pio_len; + u8 status; + + struct isci_stp_pio_sgl { + int index; + u8 set; + u32 offset; + } sgl; + u32 device_cdb_len; +}; + +struct isci_request { + enum isci_request_status status; + #define IREQ_COMPLETE_IN_TARGET 0 + #define IREQ_TERMINATED 1 + #define IREQ_TMF 2 + #define IREQ_ACTIVE 3 + unsigned long flags; + /* XXX kill ttype and ttype_ptr, allocate full sas_task */ + enum task_type ttype; + union ttype_ptr_union { + struct sas_task *io_task_ptr; /* When ttype==io_task */ + struct isci_tmf *tmf_task_ptr; /* When ttype==tmf_task */ + } ttype_ptr; + struct isci_host *isci_host; + /* For use in the requests_to_{complete|abort} lists: */ + struct list_head completed_node; + /* For use in the reqs_in_process list: */ + struct list_head dev_node; + spinlock_t state_lock; + dma_addr_t request_daddr; + dma_addr_t zero_scatter_daddr; + unsigned int num_sg_entries; + /* Note: "io_request_completion" is completed in two different ways + * depending on whether this is a TMF or regular request. + * - TMF requests are completed in the thread that started them; + * - regular requests are completed in the request completion callback + * function. + * This difference in operation allows the aborter of a TMF request + * to be sure that once the TMF request completes, the I/O that the + * TMF was aborting is guaranteed to have completed. + * + * XXX kill io_request_completion + */ + struct completion *io_request_completion; + struct sci_base_state_machine sm; + struct isci_host *owning_controller; + struct isci_remote_device *target_device; + u16 io_tag; + enum sci_request_protocol protocol; + u32 scu_status; /* hardware result */ + u32 sci_status; /* upper layer disposition */ + u32 post_context; + struct scu_task_context *tc; + /* could be larger with sg chaining */ + #define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2) + struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32))); + /* This field is a pointer to the stored rx frame data. It is used in + * STP internal requests and SMP response frames. If this field is + * non-NULL the saved frame must be released on IO request completion. + */ + u32 saved_rx_frame_index; + + union { + struct { + union { + struct ssp_cmd_iu cmd; + struct ssp_task_iu tmf; + }; + union { + struct ssp_response_iu rsp; + u8 rsp_buf[SSP_RESP_IU_MAX_SIZE]; + }; + } ssp; + struct { + struct smp_resp rsp; + } smp; + struct { + struct isci_stp_request req; + struct host_to_dev_fis cmd; + struct dev_to_host_fis rsp; + } stp; + }; +}; + +static inline struct isci_request *to_ireq(struct isci_stp_request *stp_req) +{ + struct isci_request *ireq; + + ireq = container_of(stp_req, typeof(*ireq), stp.req); + return ireq; +} + +/** + * enum sci_base_request_states - This enumeration depicts all the states for + * the common request state machine. + * + * + */ +enum sci_base_request_states { + /* + * Simply the initial state for the base request state machine. + */ + SCI_REQ_INIT, + + /* + * This state indicates that the request has been constructed. + * This state is entered from the INITIAL state. + */ + SCI_REQ_CONSTRUCTED, + + /* + * This state indicates that the request has been started. This state + * is entered from the CONSTRUCTED state. + */ + SCI_REQ_STARTED, + + SCI_REQ_STP_UDMA_WAIT_TC_COMP, + SCI_REQ_STP_UDMA_WAIT_D2H, + + SCI_REQ_STP_NON_DATA_WAIT_H2D, + SCI_REQ_STP_NON_DATA_WAIT_D2H, + + SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED, + SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG, + SCI_REQ_STP_SOFT_RESET_WAIT_D2H, + + /* + * While in this state the IO request object is waiting for the TC + * completion notification for the H2D Register FIS + */ + SCI_REQ_STP_PIO_WAIT_H2D, + + /* + * While in this state the IO request object is waiting for either a + * PIO Setup FIS or a D2H register FIS. The type of frame received is + * based on the result of the prior frame and line conditions. + */ + SCI_REQ_STP_PIO_WAIT_FRAME, + + /* + * While in this state the IO request object is waiting for a DATA + * frame from the device. + */ + SCI_REQ_STP_PIO_DATA_IN, + + /* + * While in this state the IO request object is waiting to transmit + * the next data frame to the device. + */ + SCI_REQ_STP_PIO_DATA_OUT, + + /* + * The AWAIT_TC_COMPLETION sub-state indicates that the started raw + * task management request is waiting for the transmission of the + * initial frame (i.e. command, task, etc.). + */ + SCI_REQ_TASK_WAIT_TC_COMP, + + /* + * This sub-state indicates that the started task management request + * is waiting for the reception of an unsolicited frame + * (i.e. response IU). + */ + SCI_REQ_TASK_WAIT_TC_RESP, + + /* + * This sub-state indicates that the started task management request + * is waiting for the reception of an unsolicited frame + * (i.e. response IU). + */ + SCI_REQ_SMP_WAIT_RESP, + + /* + * The AWAIT_TC_COMPLETION sub-state indicates that the started SMP + * request is waiting for the transmission of the initial frame + * (i.e. command, task, etc.). + */ + SCI_REQ_SMP_WAIT_TC_COMP, + + /* + * This state indicates that the request has completed. + * This state is entered from the STARTED state. This state is entered + * from the ABORTING state. + */ + SCI_REQ_COMPLETED, + + /* + * This state indicates that the request is in the process of being + * terminated/aborted. + * This state is entered from the CONSTRUCTED state. + * This state is entered from the STARTED state. + */ + SCI_REQ_ABORTING, + + /* + * Simply the final state for the base request state machine. + */ + SCI_REQ_FINAL, +}; + +enum sci_status sci_request_start(struct isci_request *ireq); +enum sci_status sci_io_request_terminate(struct isci_request *ireq); +enum sci_status +sci_io_request_event_handler(struct isci_request *ireq, + u32 event_code); +enum sci_status +sci_io_request_frame_handler(struct isci_request *ireq, + u32 frame_index); +enum sci_status +sci_task_request_terminate(struct isci_request *ireq); +extern enum sci_status +sci_request_complete(struct isci_request *ireq); +extern enum sci_status +sci_io_request_tc_completion(struct isci_request *ireq, u32 code); + +/* XXX open code in caller */ +static inline dma_addr_t +sci_io_request_get_dma_addr(struct isci_request *ireq, void *virt_addr) +{ + + char *requested_addr = (char *)virt_addr; + char *base_addr = (char *)ireq; + + BUG_ON(requested_addr < base_addr); + BUG_ON((requested_addr - base_addr) >= sizeof(*ireq)); + + return ireq->request_daddr + (requested_addr - base_addr); +} + +/** + * isci_request_change_state() - This function sets the status of the request + * object. + * @request: This parameter points to the isci_request object + * @status: This Parameter is the new status of the object + * + */ +static inline enum isci_request_status +isci_request_change_state(struct isci_request *isci_request, + enum isci_request_status status) +{ + enum isci_request_status old_state; + unsigned long flags; + + dev_dbg(&isci_request->isci_host->pdev->dev, + "%s: isci_request = %p, state = 0x%x\n", + __func__, + isci_request, + status); + + BUG_ON(isci_request == NULL); + + spin_lock_irqsave(&isci_request->state_lock, flags); + old_state = isci_request->status; + isci_request->status = status; + spin_unlock_irqrestore(&isci_request->state_lock, flags); + + return old_state; +} + +/** + * isci_request_change_started_to_newstate() - This function sets the status of + * the request object. + * @request: This parameter points to the isci_request object + * @status: This Parameter is the new status of the object + * + * state previous to any change. + */ +static inline enum isci_request_status +isci_request_change_started_to_newstate(struct isci_request *isci_request, + struct completion *completion_ptr, + enum isci_request_status newstate) +{ + enum isci_request_status old_state; + unsigned long flags; + + spin_lock_irqsave(&isci_request->state_lock, flags); + + old_state = isci_request->status; + + if (old_state == started || old_state == aborting) { + BUG_ON(isci_request->io_request_completion != NULL); + + isci_request->io_request_completion = completion_ptr; + isci_request->status = newstate; + } + + spin_unlock_irqrestore(&isci_request->state_lock, flags); + + dev_dbg(&isci_request->isci_host->pdev->dev, + "%s: isci_request = %p, old_state = 0x%x\n", + __func__, + isci_request, + old_state); + + return old_state; +} + +/** + * isci_request_change_started_to_aborted() - This function sets the status of + * the request object. + * @request: This parameter points to the isci_request object + * @completion_ptr: This parameter is saved as the kernel completion structure + * signalled when the old request completes. + * + * state previous to any change. + */ +static inline enum isci_request_status +isci_request_change_started_to_aborted(struct isci_request *isci_request, + struct completion *completion_ptr) +{ + return isci_request_change_started_to_newstate(isci_request, + completion_ptr, + aborted); +} + +#define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr) + +#define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr) + +struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost, + struct isci_tmf *isci_tmf, + u16 tag); +int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev, + struct sas_task *task, u16 tag); +void isci_terminate_pending_requests(struct isci_host *ihost, + struct isci_remote_device *idev); +enum sci_status +sci_task_request_construct(struct isci_host *ihost, + struct isci_remote_device *idev, + u16 io_tag, + struct isci_request *ireq); +enum sci_status +sci_task_request_construct_ssp(struct isci_request *ireq); +enum sci_status +sci_task_request_construct_sata(struct isci_request *ireq); +void sci_smp_request_copy_response(struct isci_request *ireq); + +static inline int isci_task_is_ncq_recovery(struct sas_task *task) +{ + return (sas_protocol_ata(task->task_proto) && + task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT && + task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ); + +} + +#endif /* !defined(_ISCI_REQUEST_H_) */ |