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[linux.git] / drivers / s390 / scsi / zfcp_def.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * zfcp device driver
4  *
5  * Global definitions for the zfcp device driver.
6  *
7  * Copyright IBM Corp. 2002, 2017
8  */
9
10 #ifndef ZFCP_DEF_H
11 #define ZFCP_DEF_H
12
13 /*************************** INCLUDES *****************************************/
14
15 #include <linux/init.h>
16 #include <linux/moduleparam.h>
17 #include <linux/major.h>
18 #include <linux/blkdev.h>
19 #include <linux/delay.h>
20 #include <linux/timer.h>
21 #include <linux/slab.h>
22 #include <linux/mempool.h>
23 #include <linux/syscalls.h>
24 #include <linux/scatterlist.h>
25 #include <linux/ioctl.h>
26 #include <scsi/fc/fc_fs.h>
27 #include <scsi/fc/fc_gs.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_tcq.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_host.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_fc.h>
35 #include <scsi/scsi_bsg_fc.h>
36 #include <asm/ccwdev.h>
37 #include <asm/debug.h>
38 #include <asm/ebcdic.h>
39 #include <asm/sysinfo.h>
40 #include "zfcp_fsf.h"
41 #include "zfcp_fc.h"
42 #include "zfcp_qdio.h"
43
44 /********************* FSF SPECIFIC DEFINES *********************************/
45
46 /* ATTENTION: value must not be used by hardware */
47 #define FSF_QTCB_UNSOLICITED_STATUS             0x6305
48
49 /*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
50
51 /*
52  * Note, the leftmost 12 status bits (3 nibbles) are common among adapter, port
53  * and unit. This is a mask for bitwise 'and' with status values.
54  */
55 #define ZFCP_COMMON_FLAGS                       0xfff00000
56
57 /* common status bits */
58 #define ZFCP_STATUS_COMMON_RUNNING              0x40000000
59 #define ZFCP_STATUS_COMMON_ERP_FAILED           0x20000000
60 #define ZFCP_STATUS_COMMON_UNBLOCKED            0x10000000
61 #define ZFCP_STATUS_COMMON_OPEN                 0x04000000
62 #define ZFCP_STATUS_COMMON_ERP_INUSE            0x01000000
63 #define ZFCP_STATUS_COMMON_ACCESS_DENIED        0x00800000
64 #define ZFCP_STATUS_COMMON_ACCESS_BOXED         0x00400000
65 #define ZFCP_STATUS_COMMON_NOESC                0x00200000
66
67 /* adapter status */
68 #define ZFCP_STATUS_ADAPTER_MB_ACT              0x00000001
69 #define ZFCP_STATUS_ADAPTER_QDIOUP              0x00000002
70 #define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED        0x00000004
71 #define ZFCP_STATUS_ADAPTER_XCONFIG_OK          0x00000008
72 #define ZFCP_STATUS_ADAPTER_HOST_CON_INIT       0x00000010
73 #define ZFCP_STATUS_ADAPTER_SUSPENDED           0x00000040
74 #define ZFCP_STATUS_ADAPTER_ERP_PENDING         0x00000100
75 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
76 #define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED    0x00000400
77
78 /* remote port status */
79 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
80 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
81
82 /* FSF request status (this does not have a common part) */
83 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
84 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
85 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
86 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
87 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
88 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
89
90 /************************* STRUCTURE DEFINITIONS *****************************/
91
92 /**
93  * enum zfcp_erp_act_type - Type of ERP action object.
94  * @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
95  * @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
96  * @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
97  * @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
98  *
99  * Values must fit into u8 because of code dependencies:
100  * zfcp_dbf_rec_trig(), &zfcp_dbf_rec_trigger.want, &zfcp_dbf_rec_trigger.need;
101  * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), &zfcp_dbf_rec_running.rec_action.
102  */
103 enum zfcp_erp_act_type {
104         ZFCP_ERP_ACTION_REOPEN_LUN         = 1,
105         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
106         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
107         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
108 };
109
110 /*
111  * Values must fit into u16 because of code dependencies:
112  * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), zfcp_dbf_rec_run_wka(),
113  * &zfcp_dbf_rec_running.rec_step.
114  */
115 enum zfcp_erp_steps {
116         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
117         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
118         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
119         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
120         ZFCP_ERP_STEP_LUN_CLOSING       = 0x1000,
121         ZFCP_ERP_STEP_LUN_OPENING       = 0x2000,
122 };
123
124 struct zfcp_erp_action {
125         struct list_head list;
126         enum zfcp_erp_act_type type;  /* requested action code */
127         struct zfcp_adapter *adapter; /* device which should be recovered */
128         struct zfcp_port *port;
129         struct scsi_device *sdev;
130         u32             status;       /* recovery status */
131         enum zfcp_erp_steps     step;   /* active step of this erp action */
132         unsigned long           fsf_req_id;
133         struct timer_list timer;
134 };
135
136 /* holds various memory pools of an adapter */
137 struct zfcp_adapter_mempool {
138         mempool_t *erp_req;
139         mempool_t *gid_pn_req;
140         mempool_t *scsi_req;
141         mempool_t *scsi_abort;
142         mempool_t *status_read_req;
143         mempool_t *sr_data;
144         mempool_t *gid_pn;
145         mempool_t *qtcb_pool;
146 };
147
148 struct zfcp_adapter {
149         struct kref             ref;
150         u64                     peer_wwnn;         /* P2P peer WWNN */
151         u64                     peer_wwpn;         /* P2P peer WWPN */
152         u32                     peer_d_id;         /* P2P peer D_ID */
153         struct ccw_device       *ccw_device;       /* S/390 ccw device */
154         struct zfcp_qdio        *qdio;
155         u32                     hydra_version;     /* Hydra version */
156         u32                     fsf_lic_version;
157         u32                     adapter_features;  /* FCP channel features */
158         u32                     connection_features; /* host connection features */
159         u32                     hardware_version;  /* of FCP channel */
160         u16                     timer_ticks;       /* time int for a tick */
161         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
162         struct list_head        port_list;         /* remote port list */
163         rwlock_t                port_list_lock;    /* port list lock */
164         unsigned long           req_no;            /* unique FSF req number */
165         struct zfcp_reqlist     *req_list;
166         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
167         rwlock_t                abort_lock;        /* Protects against SCSI
168                                                       stack abort/command
169                                                       completion races */
170         atomic_t                stat_miss;         /* # missing status reads*/
171         unsigned int            stat_read_buf_num;
172         struct work_struct      stat_work;
173         atomic_t                status;            /* status of this adapter */
174         struct list_head        erp_ready_head;    /* error recovery for this
175                                                       adapter/devices */
176         wait_queue_head_t       erp_ready_wq;
177         struct list_head        erp_running_head;
178         rwlock_t                erp_lock;
179         wait_queue_head_t       erp_done_wqh;
180         struct zfcp_erp_action  erp_action;        /* pending error recovery */
181         atomic_t                erp_counter;
182         u32                     erp_total_count;   /* total nr of enqueued erp
183                                                       actions */
184         u32                     erp_low_mem_count; /* nr of erp actions waiting
185                                                       for memory */
186         struct task_struct      *erp_thread;
187         struct zfcp_fc_wka_ports *gs;              /* generic services */
188         struct zfcp_dbf         *dbf;              /* debug traces */
189         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
190         struct fc_host_statistics *fc_stats;
191         struct fsf_qtcb_bottom_port *stats_reset_data;
192         unsigned long           stats_reset;
193         struct delayed_work     scan_work;
194         struct work_struct      ns_up_work;
195         struct service_level    service_level;
196         struct workqueue_struct *work_queue;
197         struct device_dma_parameters dma_parms;
198         struct zfcp_fc_events events;
199         unsigned long           next_port_scan;
200 };
201
202 struct zfcp_port {
203         struct device          dev;
204         struct fc_rport        *rport;         /* rport of fc transport class */
205         struct list_head       list;           /* list of remote ports */
206         struct zfcp_adapter    *adapter;       /* adapter used to access port */
207         struct list_head        unit_list;      /* head of logical unit list */
208         rwlock_t                unit_list_lock; /* unit list lock */
209         atomic_t                units;         /* zfcp_unit count */
210         atomic_t               status;         /* status of this remote port */
211         u64                    wwnn;           /* WWNN if known */
212         u64                    wwpn;           /* WWPN */
213         u32                    d_id;           /* D_ID */
214         u32                    handle;         /* handle assigned by FSF */
215         struct zfcp_erp_action erp_action;     /* pending error recovery */
216         atomic_t               erp_counter;
217         u32                    maxframe_size;
218         u32                    supported_classes;
219         struct work_struct     gid_pn_work;
220         struct work_struct     test_link_work;
221         struct work_struct     rport_work;
222         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
223         unsigned int            starget_id;
224 };
225
226 struct zfcp_latency_record {
227         u32 min;
228         u32 max;
229         u64 sum;
230 };
231
232 struct zfcp_latency_cont {
233         struct zfcp_latency_record channel;
234         struct zfcp_latency_record fabric;
235         u64 counter;
236 };
237
238 struct zfcp_latencies {
239         struct zfcp_latency_cont read;
240         struct zfcp_latency_cont write;
241         struct zfcp_latency_cont cmd;
242         spinlock_t lock;
243 };
244
245 /**
246  * struct zfcp_unit - LUN configured via zfcp sysfs
247  * @dev: struct device for sysfs representation and reference counting
248  * @list: entry in LUN/unit list per zfcp_port
249  * @port: reference to zfcp_port where this LUN is configured
250  * @fcp_lun: 64 bit LUN value
251  * @scsi_work: for running scsi_scan_target
252  *
253  * This is the representation of a LUN that has been configured for
254  * usage. The main data here is the 64 bit LUN value, data for
255  * running I/O and recovery is in struct zfcp_scsi_dev.
256  */
257 struct zfcp_unit {
258         struct device           dev;
259         struct list_head        list;
260         struct zfcp_port        *port;
261         u64                     fcp_lun;
262         struct work_struct      scsi_work;
263 };
264
265 /**
266  * struct zfcp_scsi_dev - zfcp data per SCSI device
267  * @status: zfcp internal status flags
268  * @lun_handle: handle from "open lun" for issuing FSF requests
269  * @erp_action: zfcp erp data for opening and recovering this LUN
270  * @erp_counter: zfcp erp counter for this LUN
271  * @latencies: FSF channel and fabric latencies
272  * @port: zfcp_port where this LUN belongs to
273  */
274 struct zfcp_scsi_dev {
275         atomic_t                status;
276         u32                     lun_handle;
277         struct zfcp_erp_action  erp_action;
278         atomic_t                erp_counter;
279         struct zfcp_latencies   latencies;
280         struct zfcp_port        *port;
281 };
282
283 /**
284  * sdev_to_zfcp - Access zfcp LUN data for SCSI device
285  * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
286  */
287 static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
288 {
289         return scsi_transport_device_data(sdev);
290 }
291
292 /**
293  * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
294  * @sdev: SCSI device where to get the LUN from
295  */
296 static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
297 {
298         u64 fcp_lun;
299
300         int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
301         return fcp_lun;
302 }
303
304 /**
305  * struct zfcp_fsf_req - basic FSF request structure
306  * @list: list of FSF requests
307  * @req_id: unique request ID
308  * @adapter: adapter this request belongs to
309  * @qdio_req: qdio queue related values
310  * @completion: used to signal the completion of the request
311  * @status: status of the request
312  * @qtcb: associated QTCB
313  * @data: private data
314  * @timer: timer data of this request
315  * @erp_action: reference to erp action if request issued on behalf of ERP
316  * @pool: reference to memory pool if used for this request
317  * @issued: time when request was send (STCK)
318  * @handler: handler which should be called to process response
319  */
320 struct zfcp_fsf_req {
321         struct list_head        list;
322         unsigned long           req_id;
323         struct zfcp_adapter     *adapter;
324         struct zfcp_qdio_req    qdio_req;
325         struct completion       completion;
326         u32                     status;
327         struct fsf_qtcb         *qtcb;
328         void                    *data;
329         struct timer_list       timer;
330         struct zfcp_erp_action  *erp_action;
331         mempool_t               *pool;
332         unsigned long long      issued;
333         void                    (*handler)(struct zfcp_fsf_req *);
334 };
335
336 static inline
337 int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
338 {
339         return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
340 }
341
342 static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
343 {
344         return req->qtcb == NULL;
345 }
346
347 #endif /* ZFCP_DEF_H */
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