Merge tag 'csky-for-linus-5.13-rc1' of git://github.com/c-sky/csky-linux
[linux-2.6-microblaze.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, 2020
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_ERP_PENDING         0x00000100
74 #define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED      0x00000200
75 #define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED    0x00000400
76
77 /* remote port status */
78 #define ZFCP_STATUS_PORT_PHYS_OPEN              0x00000001
79 #define ZFCP_STATUS_PORT_LINK_TEST              0x00000002
80
81 /* FSF request status (this does not have a common part) */
82 #define ZFCP_STATUS_FSFREQ_ERROR                0x00000008
83 #define ZFCP_STATUS_FSFREQ_CLEANUP              0x00000010
84 #define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED       0x00000040
85 #define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED       0x00000080
86 #define ZFCP_STATUS_FSFREQ_TMFUNCFAILED         0x00000200
87 #define ZFCP_STATUS_FSFREQ_DISMISSED            0x00001000
88 #define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE      0x00020000
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         u32                     fc_security_algorithms; /* of FCP channel */
161         u32                     fc_security_algorithms_old; /* of FCP channel */
162         u16                     timer_ticks;       /* time int for a tick */
163         struct Scsi_Host        *scsi_host;        /* Pointer to mid-layer */
164         struct list_head        port_list;         /* remote port list */
165         rwlock_t                port_list_lock;    /* port list lock */
166         unsigned long           req_no;            /* unique FSF req number */
167         struct zfcp_reqlist     *req_list;
168         u32                     fsf_req_seq_no;    /* FSF cmnd seq number */
169         rwlock_t                abort_lock;        /* Protects against SCSI
170                                                       stack abort/command
171                                                       completion races */
172         atomic_t                stat_miss;         /* # missing status reads*/
173         unsigned int            stat_read_buf_num;
174         struct work_struct      stat_work;
175         atomic_t                status;            /* status of this adapter */
176         struct list_head        erp_ready_head;    /* error recovery for this
177                                                       adapter/devices */
178         wait_queue_head_t       erp_ready_wq;
179         struct list_head        erp_running_head;
180         rwlock_t                erp_lock;
181         wait_queue_head_t       erp_done_wqh;
182         struct zfcp_erp_action  erp_action;        /* pending error recovery */
183         atomic_t                erp_counter;
184         u32                     erp_total_count;   /* total nr of enqueued erp
185                                                       actions */
186         u32                     erp_low_mem_count; /* nr of erp actions waiting
187                                                       for memory */
188         struct task_struct      *erp_thread;
189         struct zfcp_fc_wka_ports *gs;              /* generic services */
190         struct zfcp_dbf         *dbf;              /* debug traces */
191         struct zfcp_adapter_mempool     pool;      /* Adapter memory pools */
192         struct fc_host_statistics *fc_stats;
193         struct fsf_qtcb_bottom_port *stats_reset_data;
194         unsigned long           stats_reset;
195         struct delayed_work     scan_work;
196         struct work_struct      ns_up_work;
197         struct service_level    service_level;
198         struct workqueue_struct *work_queue;
199         struct device_dma_parameters dma_parms;
200         struct zfcp_fc_events events;
201         unsigned long           next_port_scan;
202         struct zfcp_diag_adapter        *diagnostics;
203         struct work_struct      version_change_lost_work;
204 };
205
206 struct zfcp_port {
207         struct device          dev;
208         struct fc_rport        *rport;         /* rport of fc transport class */
209         struct list_head       list;           /* list of remote ports */
210         struct zfcp_adapter    *adapter;       /* adapter used to access port */
211         struct list_head        unit_list;      /* head of logical unit list */
212         rwlock_t                unit_list_lock; /* unit list lock */
213         atomic_t                units;         /* zfcp_unit count */
214         atomic_t               status;         /* status of this remote port */
215         u64                    wwnn;           /* WWNN if known */
216         u64                    wwpn;           /* WWPN */
217         u32                    d_id;           /* D_ID */
218         u32                    handle;         /* handle assigned by FSF */
219         struct zfcp_erp_action erp_action;     /* pending error recovery */
220         atomic_t               erp_counter;
221         u32                    maxframe_size;
222         u32                    supported_classes;
223         u32                    connection_info;
224         u32                    connection_info_old;
225         struct work_struct     gid_pn_work;
226         struct work_struct     test_link_work;
227         struct work_struct     rport_work;
228         enum { RPORT_NONE, RPORT_ADD, RPORT_DEL }  rport_task;
229         unsigned int            starget_id;
230 };
231
232 struct zfcp_latency_record {
233         u32 min;
234         u32 max;
235         u64 sum;
236 };
237
238 struct zfcp_latency_cont {
239         struct zfcp_latency_record channel;
240         struct zfcp_latency_record fabric;
241         u64 counter;
242 };
243
244 struct zfcp_latencies {
245         struct zfcp_latency_cont read;
246         struct zfcp_latency_cont write;
247         struct zfcp_latency_cont cmd;
248         spinlock_t lock;
249 };
250
251 /**
252  * struct zfcp_unit - LUN configured via zfcp sysfs
253  * @dev: struct device for sysfs representation and reference counting
254  * @list: entry in LUN/unit list per zfcp_port
255  * @port: reference to zfcp_port where this LUN is configured
256  * @fcp_lun: 64 bit LUN value
257  * @scsi_work: for running scsi_scan_target
258  *
259  * This is the representation of a LUN that has been configured for
260  * usage. The main data here is the 64 bit LUN value, data for
261  * running I/O and recovery is in struct zfcp_scsi_dev.
262  */
263 struct zfcp_unit {
264         struct device           dev;
265         struct list_head        list;
266         struct zfcp_port        *port;
267         u64                     fcp_lun;
268         struct work_struct      scsi_work;
269 };
270
271 /**
272  * struct zfcp_scsi_dev - zfcp data per SCSI device
273  * @status: zfcp internal status flags
274  * @lun_handle: handle from "open lun" for issuing FSF requests
275  * @erp_action: zfcp erp data for opening and recovering this LUN
276  * @erp_counter: zfcp erp counter for this LUN
277  * @latencies: FSF channel and fabric latencies
278  * @port: zfcp_port where this LUN belongs to
279  */
280 struct zfcp_scsi_dev {
281         atomic_t                status;
282         u32                     lun_handle;
283         struct zfcp_erp_action  erp_action;
284         atomic_t                erp_counter;
285         struct zfcp_latencies   latencies;
286         struct zfcp_port        *port;
287 };
288
289 /**
290  * sdev_to_zfcp - Access zfcp LUN data for SCSI device
291  * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
292  */
293 static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
294 {
295         return scsi_transport_device_data(sdev);
296 }
297
298 /**
299  * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
300  * @sdev: SCSI device where to get the LUN from
301  */
302 static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
303 {
304         u64 fcp_lun;
305
306         int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
307         return fcp_lun;
308 }
309
310 /**
311  * struct zfcp_fsf_req - basic FSF request structure
312  * @list: list of FSF requests
313  * @req_id: unique request ID
314  * @adapter: adapter this request belongs to
315  * @qdio_req: qdio queue related values
316  * @completion: used to signal the completion of the request
317  * @status: status of the request
318  * @qtcb: associated QTCB
319  * @data: private data
320  * @timer: timer data of this request
321  * @erp_action: reference to erp action if request issued on behalf of ERP
322  * @pool: reference to memory pool if used for this request
323  * @issued: time when request was send (STCK)
324  * @handler: handler which should be called to process response
325  */
326 struct zfcp_fsf_req {
327         struct list_head        list;
328         unsigned long           req_id;
329         struct zfcp_adapter     *adapter;
330         struct zfcp_qdio_req    qdio_req;
331         struct completion       completion;
332         u32                     status;
333         struct fsf_qtcb         *qtcb;
334         void                    *data;
335         struct timer_list       timer;
336         struct zfcp_erp_action  *erp_action;
337         mempool_t               *pool;
338         unsigned long long      issued;
339         void                    (*handler)(struct zfcp_fsf_req *);
340 };
341
342 static inline
343 int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
344 {
345         return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
346 }
347
348 static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
349 {
350         return req->qtcb == NULL;
351 }
352
353 #endif /* ZFCP_DEF_H */