449 lines
14 KiB
C
449 lines
14 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ISCI_REQUEST_H_
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#define _ISCI_REQUEST_H_
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#include "isci.h"
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#include "host.h"
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#include "scu_task_context.h"
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/**
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* struct isci_request_status - This enum defines the possible states of an I/O
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* request.
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*
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*
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*/
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enum isci_request_status {
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unallocated = 0x00,
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allocated = 0x01,
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started = 0x02,
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completed = 0x03,
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aborting = 0x04,
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aborted = 0x05,
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terminating = 0x06,
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dead = 0x07
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};
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enum task_type {
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io_task = 0,
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tmf_task = 1
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};
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enum sci_request_protocol {
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SCIC_NO_PROTOCOL,
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SCIC_SMP_PROTOCOL,
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SCIC_SSP_PROTOCOL,
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SCIC_STP_PROTOCOL
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}; /* XXX remove me, use sas_task.{dev|task_proto} instead */;
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/**
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* isci_stp_request - extra request infrastructure to handle pio/atapi protocol
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* @pio_len - number of bytes requested at PIO setup
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* @status - pio setup ending status value to tell us if we need
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* to wait for another fis or if the transfer is complete. Upon
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* receipt of a d2h fis this will be the status field of that fis.
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* @sgl - track pio transfer progress as we iterate through the sgl
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* @device_cdb_len - atapi device advertises it's transfer constraints at setup
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*/
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struct isci_stp_request {
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u32 pio_len;
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u8 status;
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struct isci_stp_pio_sgl {
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int index;
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u8 set;
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u32 offset;
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} sgl;
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u32 device_cdb_len;
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};
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struct isci_request {
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enum isci_request_status status;
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#define IREQ_COMPLETE_IN_TARGET 0
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#define IREQ_TERMINATED 1
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#define IREQ_TMF 2
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#define IREQ_ACTIVE 3
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unsigned long flags;
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/* XXX kill ttype and ttype_ptr, allocate full sas_task */
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enum task_type ttype;
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union ttype_ptr_union {
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struct sas_task *io_task_ptr; /* When ttype==io_task */
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struct isci_tmf *tmf_task_ptr; /* When ttype==tmf_task */
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} ttype_ptr;
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struct isci_host *isci_host;
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/* For use in the requests_to_{complete|abort} lists: */
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struct list_head completed_node;
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/* For use in the reqs_in_process list: */
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struct list_head dev_node;
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spinlock_t state_lock;
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dma_addr_t request_daddr;
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dma_addr_t zero_scatter_daddr;
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unsigned int num_sg_entries;
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/* Note: "io_request_completion" is completed in two different ways
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* depending on whether this is a TMF or regular request.
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* - TMF requests are completed in the thread that started them;
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* - regular requests are completed in the request completion callback
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* function.
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* This difference in operation allows the aborter of a TMF request
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* to be sure that once the TMF request completes, the I/O that the
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* TMF was aborting is guaranteed to have completed.
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*
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* XXX kill io_request_completion
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*/
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struct completion *io_request_completion;
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struct sci_base_state_machine sm;
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struct isci_host *owning_controller;
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struct isci_remote_device *target_device;
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u16 io_tag;
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enum sci_request_protocol protocol;
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u32 scu_status; /* hardware result */
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u32 sci_status; /* upper layer disposition */
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u32 post_context;
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struct scu_task_context *tc;
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/* could be larger with sg chaining */
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#define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
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struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
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/* This field is a pointer to the stored rx frame data. It is used in
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* STP internal requests and SMP response frames. If this field is
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* non-NULL the saved frame must be released on IO request completion.
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*/
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u32 saved_rx_frame_index;
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union {
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struct {
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union {
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struct ssp_cmd_iu cmd;
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struct ssp_task_iu tmf;
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};
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union {
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struct ssp_response_iu rsp;
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u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
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};
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} ssp;
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struct {
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struct smp_resp rsp;
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} smp;
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struct {
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struct isci_stp_request req;
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struct host_to_dev_fis cmd;
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struct dev_to_host_fis rsp;
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} stp;
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};
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};
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static inline struct isci_request *to_ireq(struct isci_stp_request *stp_req)
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{
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struct isci_request *ireq;
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ireq = container_of(stp_req, typeof(*ireq), stp.req);
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return ireq;
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}
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/**
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* enum sci_base_request_states - This enumeration depicts all the states for
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* the common request state machine.
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*
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*
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*/
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enum sci_base_request_states {
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/*
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* Simply the initial state for the base request state machine.
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*/
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SCI_REQ_INIT,
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/*
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* This state indicates that the request has been constructed.
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* This state is entered from the INITIAL state.
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*/
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SCI_REQ_CONSTRUCTED,
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/*
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* This state indicates that the request has been started. This state
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* is entered from the CONSTRUCTED state.
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*/
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SCI_REQ_STARTED,
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SCI_REQ_STP_UDMA_WAIT_TC_COMP,
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SCI_REQ_STP_UDMA_WAIT_D2H,
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SCI_REQ_STP_NON_DATA_WAIT_H2D,
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SCI_REQ_STP_NON_DATA_WAIT_D2H,
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SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED,
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SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG,
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SCI_REQ_STP_SOFT_RESET_WAIT_D2H,
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/*
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* While in this state the IO request object is waiting for the TC
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* completion notification for the H2D Register FIS
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*/
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SCI_REQ_STP_PIO_WAIT_H2D,
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/*
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* While in this state the IO request object is waiting for either a
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* PIO Setup FIS or a D2H register FIS. The type of frame received is
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* based on the result of the prior frame and line conditions.
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*/
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SCI_REQ_STP_PIO_WAIT_FRAME,
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/*
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* While in this state the IO request object is waiting for a DATA
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* frame from the device.
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*/
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SCI_REQ_STP_PIO_DATA_IN,
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/*
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* While in this state the IO request object is waiting to transmit
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* the next data frame to the device.
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*/
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SCI_REQ_STP_PIO_DATA_OUT,
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/*
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* The AWAIT_TC_COMPLETION sub-state indicates that the started raw
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* task management request is waiting for the transmission of the
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* initial frame (i.e. command, task, etc.).
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*/
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SCI_REQ_TASK_WAIT_TC_COMP,
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/*
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* This sub-state indicates that the started task management request
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* is waiting for the reception of an unsolicited frame
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* (i.e. response IU).
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*/
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SCI_REQ_TASK_WAIT_TC_RESP,
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/*
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* This sub-state indicates that the started task management request
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* is waiting for the reception of an unsolicited frame
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* (i.e. response IU).
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*/
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SCI_REQ_SMP_WAIT_RESP,
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/*
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* The AWAIT_TC_COMPLETION sub-state indicates that the started SMP
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* request is waiting for the transmission of the initial frame
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* (i.e. command, task, etc.).
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*/
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SCI_REQ_SMP_WAIT_TC_COMP,
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/*
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* This state indicates that the request has completed.
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* This state is entered from the STARTED state. This state is entered
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* from the ABORTING state.
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*/
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SCI_REQ_COMPLETED,
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/*
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* This state indicates that the request is in the process of being
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* terminated/aborted.
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* This state is entered from the CONSTRUCTED state.
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* This state is entered from the STARTED state.
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*/
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SCI_REQ_ABORTING,
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/*
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* Simply the final state for the base request state machine.
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*/
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SCI_REQ_FINAL,
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};
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enum sci_status sci_request_start(struct isci_request *ireq);
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enum sci_status sci_io_request_terminate(struct isci_request *ireq);
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enum sci_status
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sci_io_request_event_handler(struct isci_request *ireq,
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u32 event_code);
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enum sci_status
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sci_io_request_frame_handler(struct isci_request *ireq,
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u32 frame_index);
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enum sci_status
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sci_task_request_terminate(struct isci_request *ireq);
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extern enum sci_status
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sci_request_complete(struct isci_request *ireq);
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extern enum sci_status
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sci_io_request_tc_completion(struct isci_request *ireq, u32 code);
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/* XXX open code in caller */
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static inline dma_addr_t
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sci_io_request_get_dma_addr(struct isci_request *ireq, void *virt_addr)
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{
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char *requested_addr = (char *)virt_addr;
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char *base_addr = (char *)ireq;
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BUG_ON(requested_addr < base_addr);
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BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));
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return ireq->request_daddr + (requested_addr - base_addr);
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}
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/**
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* isci_request_change_state() - This function sets the status of the request
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* object.
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* @request: This parameter points to the isci_request object
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* @status: This Parameter is the new status of the object
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*
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*/
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static inline enum isci_request_status
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isci_request_change_state(struct isci_request *isci_request,
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enum isci_request_status status)
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{
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enum isci_request_status old_state;
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unsigned long flags;
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dev_dbg(&isci_request->isci_host->pdev->dev,
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"%s: isci_request = %p, state = 0x%x\n",
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__func__,
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isci_request,
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status);
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BUG_ON(isci_request == NULL);
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spin_lock_irqsave(&isci_request->state_lock, flags);
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old_state = isci_request->status;
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isci_request->status = status;
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spin_unlock_irqrestore(&isci_request->state_lock, flags);
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return old_state;
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}
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/**
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* isci_request_change_started_to_newstate() - This function sets the status of
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* the request object.
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* @request: This parameter points to the isci_request object
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* @status: This Parameter is the new status of the object
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*
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* state previous to any change.
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*/
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static inline enum isci_request_status
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isci_request_change_started_to_newstate(struct isci_request *isci_request,
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struct completion *completion_ptr,
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enum isci_request_status newstate)
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{
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enum isci_request_status old_state;
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unsigned long flags;
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spin_lock_irqsave(&isci_request->state_lock, flags);
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old_state = isci_request->status;
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if (old_state == started || old_state == aborting) {
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BUG_ON(isci_request->io_request_completion != NULL);
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isci_request->io_request_completion = completion_ptr;
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isci_request->status = newstate;
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}
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spin_unlock_irqrestore(&isci_request->state_lock, flags);
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dev_dbg(&isci_request->isci_host->pdev->dev,
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"%s: isci_request = %p, old_state = 0x%x\n",
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__func__,
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isci_request,
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old_state);
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return old_state;
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}
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/**
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* isci_request_change_started_to_aborted() - This function sets the status of
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* the request object.
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* @request: This parameter points to the isci_request object
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* @completion_ptr: This parameter is saved as the kernel completion structure
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* signalled when the old request completes.
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*
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* state previous to any change.
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*/
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static inline enum isci_request_status
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isci_request_change_started_to_aborted(struct isci_request *isci_request,
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struct completion *completion_ptr)
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{
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return isci_request_change_started_to_newstate(isci_request,
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completion_ptr,
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aborted);
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}
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#define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)
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#define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)
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struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
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struct isci_tmf *isci_tmf,
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u16 tag);
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int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
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struct sas_task *task, u16 tag);
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void isci_terminate_pending_requests(struct isci_host *ihost,
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struct isci_remote_device *idev);
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enum sci_status
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sci_task_request_construct(struct isci_host *ihost,
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struct isci_remote_device *idev,
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u16 io_tag,
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struct isci_request *ireq);
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enum sci_status
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sci_task_request_construct_ssp(struct isci_request *ireq);
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enum sci_status
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sci_task_request_construct_sata(struct isci_request *ireq);
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void sci_smp_request_copy_response(struct isci_request *ireq);
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static inline int isci_task_is_ncq_recovery(struct sas_task *task)
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{
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return (sas_protocol_ata(task->task_proto) &&
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task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
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task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);
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}
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#endif /* !defined(_ISCI_REQUEST_H_) */
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