mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Michael Cyr](/assets/img/avatar_default.png)
Changes to support a new mechanism from phyp to better synchronize the logical partition migration (LPM) of the client partition. This includes a new VIOCTL to register that we support this new functionality, and 2 new Transport Event types, and finally another new VIOCTL to let phyp know once we're ready for the Suspend. Signed-off-by: Michael Cyr <mikecyr@us.ibm.com> Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
371 lines
11 KiB
C
371 lines
11 KiB
C
/*******************************************************************************
|
|
* 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 <linux/interrupt.h>
|
|
#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;
|
|
struct ibmvscsis_cmd *abort_cmd;
|
|
/* 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)
|
|
#define DELAY_SEND BIT(1)
|
|
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
|
|
#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
|
|
/* remove function is sleeping */
|
|
#define CFG_SLEEPING 0x01000
|
|
/* Register for Prepare for Suspend Transport Events */
|
|
#define PREP_FOR_SUSPEND_ENABLED 0x02000
|
|
/* Prepare for Suspend event sent */
|
|
#define PREP_FOR_SUSPEND_PENDING 0x04000
|
|
/* Resume from Suspend event sent */
|
|
#define PREP_FOR_SUSPEND_ABORTED 0x08000
|
|
/* Prepare for Suspend event overwrote another CRQ entry */
|
|
#define PREP_FOR_SUSPEND_OVERWRITE 0x10000
|
|
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;
|
|
uint resume_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 completion unconfig;
|
|
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))
|
|
|
|
#define PREP_FOR_SUSPEND_FLAGS (PREP_FOR_SUSPEND_ENABLED | \
|
|
PREP_FOR_SUSPEND_PENDING | \
|
|
PREP_FOR_SUSPEND_ABORTED | \
|
|
PREP_FOR_SUSPEND_OVERWRITE)
|
|
|
|
/* flag bit that are not reset during disconnect */
|
|
#define PRESERVE_FLAG_FIELDS (PREP_FOR_SUSPEND_FLAGS)
|
|
|
|
#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
|
|
#ifndef H_ENABLE_PREPARE_FOR_SUSPEND
|
|
#define H_ENABLE_PREPARE_FOR_SUSPEND 0x000000000000001DLL
|
|
#endif
|
|
#ifndef H_READY_FOR_SUSPEND
|
|
#define H_READY_FOR_SUSPEND 0x000000000000001ELL
|
|
#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
|