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Diffstat (limited to 'drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h')
| -rw-r--r-- | drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h new file mode 100644 index 000000000000..981a0c992b6c --- /dev/null +++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h @@ -0,0 +1,346 @@ +/******************************************************************************* + * IBM Virtual SCSI Target Driver + * Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp. + * Santiago Leon (santil@us.ibm.com) IBM Corp. + * Linda Xie (lxie@us.ibm.com) IBM Corp. + * + * Copyright (C) 2005-2011 FUJITA Tomonori <tomof@acm.org> + * Copyright (C) 2010 Nicholas A. Bellinger <nab@kernel.org> + * Copyright (C) 2016 Bryant G. Ly <bryantly@linux.vnet.ibm.com> IBM Corp. + * + * Authors: Bryant G. Ly <bryantly@linux.vnet.ibm.com> + * Authors: Michael Cyr <mikecyr@linux.vnet.ibm.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. + * + ****************************************************************************/ + +#ifndef __H_IBMVSCSI_TGT +#define __H_IBMVSCSI_TGT + +#include "libsrp.h" + +#define SYS_ID_NAME_LEN 64 +#define PARTITION_NAMELEN 96 +#define IBMVSCSIS_NAMELEN 32 + +#define MSG_HI 0 +#define MSG_LOW 1 + +#define MAX_CMD_Q_PAGES 4 +#define CRQ_PER_PAGE (PAGE_SIZE / sizeof(struct viosrp_crq)) +/* in terms of number of elements */ +#define DEFAULT_CMD_Q_SIZE CRQ_PER_PAGE +#define MAX_CMD_Q_SIZE (DEFAULT_CMD_Q_SIZE * MAX_CMD_Q_PAGES) + +#define SRP_VIOLATION 0x102 /* general error code */ + +/* + * SRP buffer formats defined as of 16.a supported by this driver. + */ +#define SUPPORTED_FORMATS ((SRP_DATA_DESC_DIRECT << 1) | \ + (SRP_DATA_DESC_INDIRECT << 1)) + +#define SCSI_LUN_ADDR_METHOD_FLAT 1 + +struct dma_window { + u32 liobn; /* Unique per vdevice */ + u64 tce_base; /* Physical location of the TCE table */ + u64 tce_size; /* Size of the TCE table in bytes */ +}; + +struct target_dds { + u64 unit_id; /* 64 bit will force alignment */ +#define NUM_DMA_WINDOWS 2 +#define LOCAL 0 +#define REMOTE 1 + struct dma_window window[NUM_DMA_WINDOWS]; + + /* root node property "ibm,partition-no" */ + uint partition_num; + char partition_name[PARTITION_NAMELEN]; +}; + +#define MAX_NUM_PORTS 1 +#define MAX_H_COPY_RDMA (128 * 1024) + +#define MAX_EYE 64 + +/* Return codes */ +#define ADAPT_SUCCESS 0L +/* choose error codes that do not conflict with PHYP */ +#define ERROR -40L + +struct format_code { + u8 reserved; + u8 buffers; +}; + +struct client_info { +#define SRP_VERSION "16.a" + char srp_version[8]; + /* root node property ibm,partition-name */ + char partition_name[PARTITION_NAMELEN]; + /* root node property ibm,partition-no */ + u32 partition_number; + /* initially 1 */ + u32 mad_version; + u32 os_type; +}; + +/* + * Changing this constant changes the number of seconds to wait before + * considering the client will never service its queue again. + */ +#define SECONDS_TO_CONSIDER_FAILED 30 +/* + * These constants set the polling period used to determine if the client + * has freed at least one element in the response queue. + */ +#define WAIT_SECONDS 1 +#define WAIT_NANO_SECONDS 5000 +#define MAX_TIMER_POPS ((1000000 / WAIT_NANO_SECONDS) * \ + SECONDS_TO_CONSIDER_FAILED) +/* + * general purpose timer control block + * which can be used for multiple functions + */ +struct timer_cb { + struct hrtimer timer; + /* + * how long has it been since the client + * serviced the queue. The variable is incrmented + * in the service_wait_q routine and cleared + * in send messages + */ + int timer_pops; + /* the timer is started */ + bool started; +}; + +struct cmd_queue { + /* kva */ + struct viosrp_crq *base_addr; + dma_addr_t crq_token; + /* used to maintain index */ + uint mask; + /* current element */ + uint index; + int size; +}; + +#define SCSOLNT_RESP_SHIFT 1 +#define UCSOLNT_RESP_SHIFT 2 + +#define SCSOLNT BIT(SCSOLNT_RESP_SHIFT) +#define UCSOLNT BIT(UCSOLNT_RESP_SHIFT) + +enum cmd_type { + SCSI_CDB = 0x01, + TASK_MANAGEMENT = 0x02, + /* MAD or addressed to port 0 */ + ADAPTER_MAD = 0x04, + UNSET_TYPE = 0x08, +}; + +struct iu_rsp { + u8 format; + u8 sol_not; + u16 len; + /* tag is just to help client identify cmd, so don't translate be/le */ + u64 tag; +}; + +struct ibmvscsis_cmd { + struct list_head list; + /* Used for TCM Core operations */ + struct se_cmd se_cmd; + struct iu_entry *iue; + struct iu_rsp rsp; + struct work_struct work; + struct scsi_info *adapter; + /* Sense buffer that will be mapped into outgoing status */ + unsigned char sense_buf[TRANSPORT_SENSE_BUFFER]; + u64 init_time; +#define CMD_FAST_FAIL BIT(0) + u32 flags; + char type; +}; + +struct ibmvscsis_nexus { + struct se_session *se_sess; +}; + +struct ibmvscsis_tport { + /* SCSI protocol the tport is providing */ + u8 tport_proto_id; + /* ASCII formatted WWPN for SRP Target port */ + char tport_name[IBMVSCSIS_NAMELEN]; + /* Returned by ibmvscsis_make_tport() */ + struct se_wwn tport_wwn; + /* Returned by ibmvscsis_make_tpg() */ + struct se_portal_group se_tpg; + /* ibmvscsis port target portal group tag for TCM */ + u16 tport_tpgt; + /* Pointer to TCM session for I_T Nexus */ + struct ibmvscsis_nexus *ibmv_nexus; + bool enabled; + bool releasing; +}; + +struct scsi_info { + struct list_head list; + char eye[MAX_EYE]; + + /* commands waiting for space on repsonse queue */ + struct list_head waiting_rsp; +#define NO_QUEUE 0x00 +#define WAIT_ENABLED 0X01 + /* driver has received an initialize command */ +#define PART_UP_WAIT_ENAB 0x02 +#define WAIT_CONNECTION 0x04 + /* have established a connection */ +#define CONNECTED 0x08 + /* at least one port is processing SRP IU */ +#define SRP_PROCESSING 0x10 + /* remove request received */ +#define UNCONFIGURING 0x20 + /* disconnect by letting adapter go idle, no error */ +#define WAIT_IDLE 0x40 + /* disconnecting to clear an error */ +#define ERR_DISCONNECT 0x80 + /* disconnect to clear error state, then come back up */ +#define ERR_DISCONNECT_RECONNECT 0x100 + /* disconnected after clearing an error */ +#define ERR_DISCONNECTED 0x200 + /* A series of errors caused unexpected errors */ +#define UNDEFINED 0x400 + u16 state; + int fast_fail; + struct target_dds dds; + char *cmd_pool; + /* list of free commands */ + struct list_head free_cmd; + /* command elements ready for scheduler */ + struct list_head schedule_q; + /* commands sent to TCM */ + struct list_head active_q; + caddr_t *map_buf; + /* ioba of map buffer */ + dma_addr_t map_ioba; + /* allowable number of outstanding SRP requests */ + int request_limit; + /* extra credit */ + int credit; + /* outstanding transactions against credit limit */ + int debit; + + /* allow only one outstanding mad request */ +#define PROCESSING_MAD 0x00002 + /* Waiting to go idle */ +#define WAIT_FOR_IDLE 0x00004 + /* H_REG_CRQ called */ +#define CRQ_CLOSED 0x00010 + /* detected that client has failed */ +#define CLIENT_FAILED 0x00040 + /* detected that transport event occurred */ +#define TRANS_EVENT 0x00080 + /* don't attempt to send anything to the client */ +#define RESPONSE_Q_DOWN 0x00100 + /* request made to schedule disconnect handler */ +#define SCHEDULE_DISCONNECT 0x00400 + /* disconnect handler is scheduled */ +#define DISCONNECT_SCHEDULED 0x00800 + u32 flags; + /* adapter lock */ + spinlock_t intr_lock; + /* information needed to manage command queue */ + struct cmd_queue cmd_q; + /* used in hcall to copy response back into srp buffer */ + u64 empty_iu_id; + /* used in crq, to tag what iu the response is for */ + u64 empty_iu_tag; + uint new_state; + /* control block for the response queue timer */ + struct timer_cb rsp_q_timer; + /* keep last client to enable proper accounting */ + struct client_info client_data; + /* what can this client do */ + u32 client_cap; + /* + * The following two fields capture state and flag changes that + * can occur when the lock is given up. In the orginal design, + * the lock was held during calls into phyp; + * however, phyp did not meet PAPR architecture. This is + * a work around. + */ + u16 phyp_acr_state; + u32 phyp_acr_flags; + + struct workqueue_struct *work_q; + struct completion wait_idle; + struct device dev; + struct vio_dev *dma_dev; + struct srp_target target; + struct ibmvscsis_tport tport; + struct tasklet_struct work_task; + struct work_struct proc_work; +}; + +/* + * Provide a constant that allows software to detect the adapter is + * disconnecting from the client from one of several states. + */ +#define IS_DISCONNECTING (UNCONFIGURING | ERR_DISCONNECT_RECONNECT | \ + ERR_DISCONNECT) + +/* + * Provide a constant that can be used with interrupt handling that + * essentially lets the interrupt handler know that all requests should + * be thrown out, + */ +#define DONT_PROCESS_STATE (IS_DISCONNECTING | UNDEFINED | \ + ERR_DISCONNECTED | WAIT_IDLE) + +/* + * If any of these flag bits are set then do not allow the interrupt + * handler to schedule the off level handler. + */ +#define BLOCK (DISCONNECT_SCHEDULED) + +/* State and transition events that stop the interrupt handler */ +#define TARGET_STOP(VSCSI) (long)(((VSCSI)->state & DONT_PROCESS_STATE) | \ + ((VSCSI)->flags & BLOCK)) + +/* flag bit that are not reset during disconnect */ +#define PRESERVE_FLAG_FIELDS 0 + +#define vio_iu(IUE) ((union viosrp_iu *)((IUE)->sbuf->buf)) + +#define READ_CMD(cdb) (((cdb)[0] & 0x1F) == 8) +#define WRITE_CMD(cdb) (((cdb)[0] & 0x1F) == 0xA) + +#ifndef H_GET_PARTNER_INFO +#define H_GET_PARTNER_INFO 0x0000000000000008LL +#endif + +#define h_copy_rdma(l, sa, sb, da, db) \ + plpar_hcall_norets(H_COPY_RDMA, l, sa, sb, da, db) +#define h_vioctl(u, o, a, u1, u2, u3, u4) \ + plpar_hcall_norets(H_VIOCTL, u, o, a, u1, u2) +#define h_reg_crq(ua, tok, sz) \ + plpar_hcall_norets(H_REG_CRQ, ua, tok, sz) +#define h_free_crq(ua) \ + plpar_hcall_norets(H_FREE_CRQ, ua) +#define h_send_crq(ua, d1, d2) \ + plpar_hcall_norets(H_SEND_CRQ, ua, d1, d2) + +#endif |