1 /*
2 * linux/drivers/s390/cio/qdio.h
3 *
4 * Copyright 2000,2008 IBM Corp.
5 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
6 * Jan Glauber <jang@linux.vnet.ibm.com>
7 */
8 #ifndef _CIO_QDIO_H
9 #define _CIO_QDIO_H
10
11 #include <asm/page.h>
12 #include <asm/schid.h>
13 #include <asm/debug.h>
14 #include "chsc.h"
15
16 #define QDIO_BUSY_BIT_PATIENCE 100 /* 100 microseconds */
17 #define QDIO_INPUT_THRESHOLD 500 /* 500 microseconds */
18
19 /*
20 * if an asynchronous HiperSockets queue runs full, the 10 seconds timer wait
21 * till next initiative to give transmitted skbs back to the stack is too long.
22 * Therefore polling is started in case of multicast queue is filled more
23 * than 50 percent.
24 */
25 #define QDIO_IQDIO_POLL_LVL 65 /* HS multicast queue */
26
27 enum qdio_irq_states {
28 QDIO_IRQ_STATE_INACTIVE,
29 QDIO_IRQ_STATE_ESTABLISHED,
30 QDIO_IRQ_STATE_ACTIVE,
31 QDIO_IRQ_STATE_STOPPED,
32 QDIO_IRQ_STATE_CLEANUP,
33 QDIO_IRQ_STATE_ERR,
34 NR_QDIO_IRQ_STATES,
35 };
36
37 /* used as intparm in do_IO */
38 #define QDIO_DOING_ESTABLISH 1
39 #define QDIO_DOING_ACTIVATE 2
40 #define QDIO_DOING_CLEANUP 3
41
42 #define SLSB_STATE_NOT_INIT 0x0
43 #define SLSB_STATE_EMPTY 0x1
44 #define SLSB_STATE_PRIMED 0x2
45 #define SLSB_STATE_HALTED 0xe
46 #define SLSB_STATE_ERROR 0xf
47 #define SLSB_TYPE_INPUT 0x0
48 #define SLSB_TYPE_OUTPUT 0x20
49 #define SLSB_OWNER_PROG 0x80
50 #define SLSB_OWNER_CU 0x40
51
52 #define SLSB_P_INPUT_NOT_INIT \
53 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT) /* 0x80 */
54 #define SLSB_P_INPUT_ACK \
55 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x81 */
56 #define SLSB_CU_INPUT_EMPTY \
57 (SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x41 */
58 #define SLSB_P_INPUT_PRIMED \
59 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED) /* 0x82 */
60 #define SLSB_P_INPUT_HALTED \
61 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED) /* 0x8e */
62 #define SLSB_P_INPUT_ERROR \
63 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR) /* 0x8f */
64 #define SLSB_P_OUTPUT_NOT_INIT \
65 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */
66 #define SLSB_P_OUTPUT_EMPTY \
67 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY) /* 0xa1 */
68 #define SLSB_CU_OUTPUT_PRIMED \
69 (SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED) /* 0x62 */
70 #define SLSB_P_OUTPUT_HALTED \
71 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED) /* 0xae */
72 #define SLSB_P_OUTPUT_ERROR \
73 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR) /* 0xaf */
74
75 #define SLSB_ERROR_DURING_LOOKUP 0xff
76
77 /* additional CIWs returned by extended Sense-ID */
78 #define CIW_TYPE_EQUEUE 0x3 /* establish QDIO queues */
79 #define CIW_TYPE_AQUEUE 0x4 /* activate QDIO queues */
80
81 /* flags for st qdio sch data */
82 #define CHSC_FLAG_QDIO_CAPABILITY 0x80
83 #define CHSC_FLAG_VALIDITY 0x40
84
85 /* qdio adapter-characteristics-1 flag */
86 #define AC1_SIGA_INPUT_NEEDED 0x40 /* process input queues */
87 #define AC1_SIGA_OUTPUT_NEEDED 0x20 /* process output queues */
88 #define AC1_SIGA_SYNC_NEEDED 0x10 /* ask hypervisor to sync */
89 #define AC1_AUTOMATIC_SYNC_ON_THININT 0x08 /* set by hypervisor */
90 #define AC1_AUTOMATIC_SYNC_ON_OUT_PCI 0x04 /* set by hypervisor */
91 #define AC1_SC_QEBSM_AVAILABLE 0x02 /* available for subchannel */
92 #define AC1_SC_QEBSM_ENABLED 0x01 /* enabled for subchannel */
93
94 #ifdef CONFIG_64BIT
95 static inline int do_sqbs(u64 token, unsigned char state, int queue,
96 int *start, int *count)
97 {
98 register unsigned long _ccq asm ("") = *count;
99 register unsigned long _token asm ("1") = token;
100 unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
101
102 asm volatile(
103 " .insn rsy,0xeb000000008A,%1,0,0(%2)"
104 : "+d" (_ccq), "+d" (_queuestart)
105 : "d" ((unsigned long)state), "d" (_token)
106 : "memory", "cc");
107 *count = _ccq & 0xff;
108 *start = _queuestart & 0xff;
109
110 return (_ccq >> 32) & 0xff;
111 }
112
113 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
114 int *start, int *count, int ack)
115 {
116 register unsigned long _ccq asm ("") = *count;
117 register unsigned long _token asm ("1") = token;
118 unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
119 unsigned long _state = (unsigned long)ack << 63;
120
121 asm volatile(
122 " .insn rrf,0xB99c0000,%1,%2,0,0"
123 : "+d" (_ccq), "+d" (_queuestart), "+d" (_state)
124 : "d" (_token)
125 : "memory", "cc");
126 *count = _ccq & 0xff;
127 *start = _queuestart & 0xff;
128 *state = _state & 0xff;
129
130 return (_ccq >> 32) & 0xff;
131 }
132 #else
133 static inline int do_sqbs(u64 token, unsigned char state, int queue,
134 int *start, int *count) { return 0; }
135 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
136 int *start, int *count, int ack) { return 0; }
137 #endif /* CONFIG_64BIT */
138
139 struct qdio_irq;
140
141 struct siga_flag {
142 u8 input:1;
143 u8 output:1;
144 u8 sync:1;
145 u8 no_sync_ti:1;
146 u8 no_sync_out_ti:1;
147 u8 no_sync_out_pci:1;
148 u8:2;
149 } __attribute__ ((packed));
150
151 struct chsc_ssqd_area {
152 struct chsc_header request;
153 u16:10;
154 u8 ssid:2;
155 u8 fmt:4;
156 u16 first_sch;
157 u16:16;
158 u16 last_sch;
159 u32:32;
160 struct chsc_header response;
161 u32:32;
162 struct qdio_ssqd_desc qdio_ssqd;
163 } __attribute__ ((packed));
164
165 struct scssc_area {
166 struct chsc_header request;
167 u16 operation_code;
168 u16:16;
169 u32:32;
170 u32:32;
171 u64 summary_indicator_addr;
172 u64 subchannel_indicator_addr;
173 u32 ks:4;
174 u32 kc:4;
175 u32:21;
176 u32 isc:3;
177 u32 word_with_d_bit;
178 u32:32;
179 struct subchannel_id schid;
180 u32 reserved[1004];
181 struct chsc_header response;
182 u32:32;
183 } __attribute__ ((packed));
184
185 struct qdio_input_q {
186 /* input buffer acknowledgement flag */
187 int polling;
188
189 /* first ACK'ed buffer */
190 int ack_start;
191
192 /* how much sbals are acknowledged with qebsm */
193 int ack_count;
194
195 /* last time of noticing incoming data */
196 u64 timestamp;
197 };
198
199 struct qdio_output_q {
200 /* PCIs are enabled for the queue */
201 int pci_out_enabled;
202
203 /* IQDIO: output multiple buffers (enhanced SIGA) */
204 int use_enh_siga;
205
206 /* timer to check for more outbound work */
207 struct timer_list timer;
208 };
209
210 struct qdio_q {
211 struct slsb slsb;
212 union {
213 struct qdio_input_q in;
214 struct qdio_output_q out;
215 } u;
216
217 /* queue number */
218 int nr;
219
220 /* bitmask of queue number */
221 int mask;
222
223 /* input or output queue */
224 int is_input_q;
225
226 /* list of thinint input queues */
227 struct list_head entry;
228
229 /* upper-layer program handler */
230 qdio_handler_t (*handler);
231
232 /*
233 * inbound: next buffer the program should check for
234 * outbound: next buffer to check for having been processed
235 * by the card
236 */
237 int first_to_check;
238
239 /* first_to_check of the last time */
240 int last_move;
241
242 /* beginning position for calling the program */
243 int first_to_kick;
244
245 /* number of buffers in use by the adapter */
246 atomic_t nr_buf_used;
247
248 struct qdio_irq *irq_ptr;
249 struct tasklet_struct tasklet;
250
251 /* error condition during a data transfer */
252 unsigned int qdio_error;
253
254 struct sl *sl;
255 struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
256
257 /*
258 * Warning: Leave this member at the end so it won't be cleared in
259 * qdio_fill_qs. A page is allocated under this pointer and used for
260 * slib and sl. slib is 2048 bytes big and sl points to offset
261 * PAGE_SIZE / 2.
262 */
263 struct slib *slib;
264 } __attribute__ ((aligned(256)));
265
266 struct qdio_irq {
267 struct qib qib;
268 u32 *dsci; /* address of device state change indicator */
269 struct ccw_device *cdev;
270
271 unsigned long int_parm;
272 struct subchannel_id schid;
273 unsigned long sch_token; /* QEBSM facility */
274
275 enum qdio_irq_states state;
276
277 struct siga_flag siga_flag; /* siga sync information from qdioac */
278
279 int nr_input_qs;
280 int nr_output_qs;
281
282 struct ccw1 ccw;
283 struct ciw equeue;
284 struct ciw aqueue;
285
286 struct qdio_ssqd_desc ssqd_desc;
287
288 void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
289
290 /*
291 * Warning: Leave these members together at the end so they won't be
292 * cleared in qdio_setup_irq.
293 */
294 struct qdr *qdr;
295 unsigned long chsc_page;
296
297 struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
298 struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
299
300 debug_info_t *debug_area;
301 struct mutex setup_mutex;
302 };
303
304 /* helper functions */
305 #define queue_type(q) q->irq_ptr->qib.qfmt
306 #define SCH_NO(q) (q->irq_ptr->schid.sch_no)
307
308 #define is_thinint_irq(irq) \
309 (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
310 css_general_characteristics.aif_osa)
311
312 /* the highest iqdio queue is used for multicast */
313 static inline int multicast_outbound(struct qdio_q *q)
314 {
315 return (q->irq_ptr->nr_output_qs > 1) &&
316 (q->nr == q->irq_ptr->nr_output_qs - 1);
317 }
318
319 static inline unsigned long long get_usecs(void)
320 {
321 return monotonic_clock() >> 12;
322 }
323
324 #define pci_out_supported(q) \
325 (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
326 #define is_qebsm(q) (q->irq_ptr->sch_token != 0)
327
328 #define need_siga_sync_thinint(q) (!q->irq_ptr->siga_flag.no_sync_ti)
329 #define need_siga_sync_out_thinint(q) (!q->irq_ptr->siga_flag.no_sync_out_ti)
330 #define need_siga_in(q) (q->irq_ptr->siga_flag.input)
331 #define need_siga_out(q) (q->irq_ptr->siga_flag.output)
332 #define need_siga_sync(q) (q->irq_ptr->siga_flag.sync)
333 #define siga_syncs_out_pci(q) (q->irq_ptr->siga_flag.no_sync_out_pci)
334
335 #define for_each_input_queue(irq_ptr, q, i) \
336 for (i = 0, q = irq_ptr->input_qs[0]; \
337 i < irq_ptr->nr_input_qs; \
338 q = irq_ptr->input_qs[++i])
339 #define for_each_output_queue(irq_ptr, q, i) \
340 for (i = 0, q = irq_ptr->output_qs[0]; \
341 i < irq_ptr->nr_output_qs; \
342 q = irq_ptr->output_qs[++i])
343
344 #define prev_buf(bufnr) \
345 ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK)
346 #define next_buf(bufnr) \
347 ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK)
348 #define add_buf(bufnr, inc) \
349 ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK)
350 #define sub_buf(bufnr, dec) \
351 ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK)
352
353 /* prototypes for thin interrupt */
354 void qdio_setup_thinint(struct qdio_irq *irq_ptr);
355 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
356 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
357 void tiqdio_add_input_queues(struct qdio_irq *irq_ptr);
358 void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr);
359 void tiqdio_inbound_processing(unsigned long q);
360 int tiqdio_allocate_memory(void);
361 void tiqdio_free_memory(void);
362 int tiqdio_register_thinints(void);
363 void tiqdio_unregister_thinints(void);
364
365 /* prototypes for setup */
366 void qdio_inbound_processing(unsigned long data);
367 void qdio_outbound_processing(unsigned long data);
368 void qdio_outbound_timer(unsigned long data);
369 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
370 struct irb *irb);
371 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
372 int nr_output_qs);
373 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
374 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
375 struct subchannel_id *schid,
376 struct qdio_ssqd_desc *data);
377 int qdio_setup_irq(struct qdio_initialize *init_data);
378 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr,
379 struct ccw_device *cdev);
380 void qdio_release_memory(struct qdio_irq *irq_ptr);
381 int qdio_setup_create_sysfs(struct ccw_device *cdev);
382 void qdio_setup_destroy_sysfs(struct ccw_device *cdev);
383 int qdio_setup_init(void);
384 void qdio_setup_exit(void);
385
386 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
387 unsigned char *state);
388 #endif /* _CIO_QDIO_H */
389
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