372 lines
11 KiB
C
372 lines
11 KiB
C
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/*******************************************************************************
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* IBM Virtual SCSI Target Driver
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* Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
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* Santiago Leon (santil@us.ibm.com) IBM Corp.
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* Linda Xie (lxie@us.ibm.com) IBM Corp.
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*
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* Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org>
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* Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org>
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* Copyright (C) 2016 Bryant G. Ly <bryantly@linux.vnet.ibm.com> IBM Corp.
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*
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* Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
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* Authors: Michael Cyr <mikecyr@linux.vnet.ibm.com>
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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 the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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****************************************************************************/
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#ifndef __H_IBMVSCSI_TGT
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#define __H_IBMVSCSI_TGT
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#include <linux/interrupt.h>
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#include "libsrp.h"
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#define SYS_ID_NAME_LEN 64
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#define PARTITION_NAMELEN 96
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#define IBMVSCSIS_NAMELEN 32
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#define MSG_HI 0
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#define MSG_LOW 1
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#define MAX_CMD_Q_PAGES 4
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#define CRQ_PER_PAGE (PAGE_SIZE / sizeof(struct viosrp_crq))
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/* in terms of number of elements */
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#define DEFAULT_CMD_Q_SIZE CRQ_PER_PAGE
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#define MAX_CMD_Q_SIZE (DEFAULT_CMD_Q_SIZE * MAX_CMD_Q_PAGES)
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#define SRP_VIOLATION 0x102 /* general error code */
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/*
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* SRP buffer formats defined as of 16.a supported by this driver.
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*/
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#define SUPPORTED_FORMATS ((SRP_DATA_DESC_DIRECT << 1) | \
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(SRP_DATA_DESC_INDIRECT << 1))
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#define SCSI_LUN_ADDR_METHOD_FLAT 1
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struct dma_window {
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u32 liobn; /* Unique per vdevice */
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u64 tce_base; /* Physical location of the TCE table */
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u64 tce_size; /* Size of the TCE table in bytes */
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};
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struct target_dds {
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u64 unit_id; /* 64 bit will force alignment */
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#define NUM_DMA_WINDOWS 2
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#define LOCAL 0
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#define REMOTE 1
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struct dma_window window[NUM_DMA_WINDOWS];
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/* root node property "ibm,partition-no" */
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uint partition_num;
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char partition_name[PARTITION_NAMELEN];
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};
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#define MAX_NUM_PORTS 1
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#define MAX_H_COPY_RDMA (128 * 1024)
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#define MAX_EYE 64
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/* Return codes */
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#define ADAPT_SUCCESS 0L
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/* choose error codes that do not conflict with PHYP */
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#define ERROR -40L
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struct format_code {
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u8 reserved;
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u8 buffers;
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};
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struct client_info {
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#define SRP_VERSION "16.a"
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char srp_version[8];
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/* root node property ibm,partition-name */
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char partition_name[PARTITION_NAMELEN];
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/* root node property ibm,partition-no */
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u32 partition_number;
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/* initially 1 */
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u32 mad_version;
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u32 os_type;
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};
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/*
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* Changing this constant changes the number of seconds to wait before
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* considering the client will never service its queue again.
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*/
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#define SECONDS_TO_CONSIDER_FAILED 30
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/*
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* These constants set the polling period used to determine if the client
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* has freed at least one element in the response queue.
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*/
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#define WAIT_SECONDS 1
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#define WAIT_NANO_SECONDS 5000
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#define MAX_TIMER_POPS ((1000000 / WAIT_NANO_SECONDS) * \
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SECONDS_TO_CONSIDER_FAILED)
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/*
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* general purpose timer control block
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* which can be used for multiple functions
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*/
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struct timer_cb {
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struct hrtimer timer;
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/*
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* how long has it been since the client
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* serviced the queue. The variable is incrmented
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* in the service_wait_q routine and cleared
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* in send messages
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*/
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int timer_pops;
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/* the timer is started */
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bool started;
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};
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struct cmd_queue {
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/* kva */
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struct viosrp_crq *base_addr;
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dma_addr_t crq_token;
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/* used to maintain index */
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uint mask;
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/* current element */
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uint index;
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int size;
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};
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#define SCSOLNT_RESP_SHIFT 1
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#define UCSOLNT_RESP_SHIFT 2
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#define SCSOLNT BIT(SCSOLNT_RESP_SHIFT)
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#define UCSOLNT BIT(UCSOLNT_RESP_SHIFT)
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enum cmd_type {
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SCSI_CDB = 0x01,
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TASK_MANAGEMENT = 0x02,
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/* MAD or addressed to port 0 */
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ADAPTER_MAD = 0x04,
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UNSET_TYPE = 0x08,
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};
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struct iu_rsp {
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u8 format;
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u8 sol_not;
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u16 len;
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/* tag is just to help client identify cmd, so don't translate be/le */
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u64 tag;
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};
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struct ibmvscsis_cmd {
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struct list_head list;
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/* Used for TCM Core operations */
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struct se_cmd se_cmd;
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struct iu_entry *iue;
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struct iu_rsp rsp;
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struct work_struct work;
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struct scsi_info *adapter;
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struct ibmvscsis_cmd *abort_cmd;
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/* Sense buffer that will be mapped into outgoing status */
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unsigned char sense_buf[TRANSPORT_SENSE_BUFFER];
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u64 init_time;
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#define CMD_FAST_FAIL BIT(0)
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#define DELAY_SEND BIT(1)
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u32 flags;
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char type;
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};
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struct ibmvscsis_nexus {
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struct se_session *se_sess;
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};
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struct ibmvscsis_tport {
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/* SCSI protocol the tport is providing */
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u8 tport_proto_id;
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/* ASCII formatted WWPN for SRP Target port */
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char tport_name[IBMVSCSIS_NAMELEN];
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/* Returned by ibmvscsis_make_tport() */
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struct se_wwn tport_wwn;
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/* Returned by ibmvscsis_make_tpg() */
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struct se_portal_group se_tpg;
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/* ibmvscsis port target portal group tag for TCM */
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u16 tport_tpgt;
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/* Pointer to TCM session for I_T Nexus */
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struct ibmvscsis_nexus *ibmv_nexus;
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bool enabled;
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bool releasing;
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};
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struct scsi_info {
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struct list_head list;
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char eye[MAX_EYE];
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/* commands waiting for space on repsonse queue */
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struct list_head waiting_rsp;
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#define NO_QUEUE 0x00
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#define WAIT_ENABLED 0X01
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#define WAIT_CONNECTION 0x04
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/* have established a connection */
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#define CONNECTED 0x08
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/* at least one port is processing SRP IU */
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#define SRP_PROCESSING 0x10
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/* remove request received */
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#define UNCONFIGURING 0x20
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/* disconnect by letting adapter go idle, no error */
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#define WAIT_IDLE 0x40
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/* disconnecting to clear an error */
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#define ERR_DISCONNECT 0x80
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/* disconnect to clear error state, then come back up */
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#define ERR_DISCONNECT_RECONNECT 0x100
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/* disconnected after clearing an error */
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#define ERR_DISCONNECTED 0x200
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/* A series of errors caused unexpected errors */
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#define UNDEFINED 0x400
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u16 state;
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int fast_fail;
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struct target_dds dds;
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char *cmd_pool;
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/* list of free commands */
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struct list_head free_cmd;
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/* command elements ready for scheduler */
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struct list_head schedule_q;
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/* commands sent to TCM */
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struct list_head active_q;
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caddr_t *map_buf;
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/* ioba of map buffer */
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dma_addr_t map_ioba;
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/* allowable number of outstanding SRP requests */
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int request_limit;
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/* extra credit */
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int credit;
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/* outstanding transactions against credit limit */
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int debit;
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/* allow only one outstanding mad request */
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#define PROCESSING_MAD 0x00002
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/* Waiting to go idle */
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#define WAIT_FOR_IDLE 0x00004
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/* H_REG_CRQ called */
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#define CRQ_CLOSED 0x00010
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/* detected that client has failed */
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#define CLIENT_FAILED 0x00040
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/* detected that transport event occurred */
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#define TRANS_EVENT 0x00080
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/* don't attempt to send anything to the client */
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#define RESPONSE_Q_DOWN 0x00100
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/* request made to schedule disconnect handler */
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#define SCHEDULE_DISCONNECT 0x00400
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/* disconnect handler is scheduled */
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#define DISCONNECT_SCHEDULED 0x00800
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/* remove function is sleeping */
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#define CFG_SLEEPING 0x01000
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/* Register for Prepare for Suspend Transport Events */
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#define PREP_FOR_SUSPEND_ENABLED 0x02000
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/* Prepare for Suspend event sent */
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#define PREP_FOR_SUSPEND_PENDING 0x04000
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/* Resume from Suspend event sent */
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#define PREP_FOR_SUSPEND_ABORTED 0x08000
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/* Prepare for Suspend event overwrote another CRQ entry */
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#define PREP_FOR_SUSPEND_OVERWRITE 0x10000
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u32 flags;
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/* adapter lock */
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spinlock_t intr_lock;
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/* information needed to manage command queue */
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struct cmd_queue cmd_q;
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/* used in hcall to copy response back into srp buffer */
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u64 empty_iu_id;
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/* used in crq, to tag what iu the response is for */
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u64 empty_iu_tag;
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uint new_state;
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uint resume_state;
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/* control block for the response queue timer */
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struct timer_cb rsp_q_timer;
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/* keep last client to enable proper accounting */
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struct client_info client_data;
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/* what can this client do */
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u32 client_cap;
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/*
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* The following two fields capture state and flag changes that
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* can occur when the lock is given up. In the orginal design,
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* the lock was held during calls into phyp;
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* however, phyp did not meet PAPR architecture. This is
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* a work around.
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*/
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u16 phyp_acr_state;
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u32 phyp_acr_flags;
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struct workqueue_struct *work_q;
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struct completion wait_idle;
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struct completion unconfig;
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struct device dev;
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struct vio_dev *dma_dev;
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struct srp_target target;
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struct ibmvscsis_tport tport;
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struct tasklet_struct work_task;
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struct work_struct proc_work;
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};
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/*
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* Provide a constant that allows software to detect the adapter is
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* disconnecting from the client from one of several states.
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*/
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#define IS_DISCONNECTING (UNCONFIGURING | ERR_DISCONNECT_RECONNECT | \
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ERR_DISCONNECT)
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/*
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* Provide a constant that can be used with interrupt handling that
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* essentially lets the interrupt handler know that all requests should
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* be thrown out,
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*/
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#define DONT_PROCESS_STATE (IS_DISCONNECTING | UNDEFINED | \
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ERR_DISCONNECTED | WAIT_IDLE)
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/*
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* If any of these flag bits are set then do not allow the interrupt
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* handler to schedule the off level handler.
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*/
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#define BLOCK (DISCONNECT_SCHEDULED)
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/* State and transition events that stop the interrupt handler */
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#define TARGET_STOP(VSCSI) (long)(((VSCSI)->state & DONT_PROCESS_STATE) | \
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((VSCSI)->flags & BLOCK))
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#define PREP_FOR_SUSPEND_FLAGS (PREP_FOR_SUSPEND_ENABLED | \
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PREP_FOR_SUSPEND_PENDING | \
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PREP_FOR_SUSPEND_ABORTED | \
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PREP_FOR_SUSPEND_OVERWRITE)
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/* flag bit that are not reset during disconnect */
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#define PRESERVE_FLAG_FIELDS (PREP_FOR_SUSPEND_FLAGS)
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#define vio_iu(IUE) ((union viosrp_iu *)((IUE)->sbuf->buf))
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#define READ_CMD(cdb) (((cdb)[0] & 0x1F) == 8)
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#define WRITE_CMD(cdb) (((cdb)[0] & 0x1F) == 0xA)
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#ifndef H_GET_PARTNER_INFO
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#define H_GET_PARTNER_INFO 0x0000000000000008LL
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#endif
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#ifndef H_ENABLE_PREPARE_FOR_SUSPEND
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#define H_ENABLE_PREPARE_FOR_SUSPEND 0x000000000000001DLL
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#endif
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#ifndef H_READY_FOR_SUSPEND
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#define H_READY_FOR_SUSPEND 0x000000000000001ELL
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#endif
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#define h_copy_rdma(l, sa, sb, da, db) \
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plpar_hcall_norets(H_COPY_RDMA, l, sa, sb, da, db)
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#define h_vioctl(u, o, a, u1, u2, u3, u4) \
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plpar_hcall_norets(H_VIOCTL, u, o, a, u1, u2)
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#define h_reg_crq(ua, tok, sz) \
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plpar_hcall_norets(H_REG_CRQ, ua, tok, sz)
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#define h_free_crq(ua) \
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plpar_hcall_norets(H_FREE_CRQ, ua)
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#define h_send_crq(ua, d1, d2) \
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plpar_hcall_norets(H_SEND_CRQ, ua, d1, d2)
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#endif
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