1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright IBM Corp. 2000, 2009
4 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
5 * Jan Glauber <jang@linux.vnet.ibm.com>
11 #include <asm/schid.h>
12 #include <asm/debug.h>
15 #define QDIO_BUSY_BIT_PATIENCE (100 << 12) /* 100 microseconds */
16 #define QDIO_BUSY_BIT_RETRY_DELAY 10 /* 10 milliseconds */
17 #define QDIO_BUSY_BIT_RETRIES 1000 /* = 10s retry time */
19 enum qdio_irq_states {
20 QDIO_IRQ_STATE_INACTIVE,
21 QDIO_IRQ_STATE_ESTABLISHED,
22 QDIO_IRQ_STATE_ACTIVE,
23 QDIO_IRQ_STATE_STOPPED,
24 QDIO_IRQ_STATE_CLEANUP,
29 /* used as intparm in do_IO */
30 #define QDIO_DOING_ESTABLISH 1
31 #define QDIO_DOING_ACTIVATE 2
32 #define QDIO_DOING_CLEANUP 3
34 #define SLSB_STATE_NOT_INIT 0x0
35 #define SLSB_STATE_EMPTY 0x1
36 #define SLSB_STATE_PRIMED 0x2
37 #define SLSB_STATE_PENDING 0x3
38 #define SLSB_STATE_HALTED 0xe
39 #define SLSB_STATE_ERROR 0xf
40 #define SLSB_TYPE_INPUT 0x0
41 #define SLSB_TYPE_OUTPUT 0x20
42 #define SLSB_OWNER_PROG 0x80
43 #define SLSB_OWNER_CU 0x40
45 #define SLSB_P_INPUT_NOT_INIT \
46 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT) /* 0x80 */
47 #define SLSB_P_INPUT_ACK \
48 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x81 */
49 #define SLSB_CU_INPUT_EMPTY \
50 (SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x41 */
51 #define SLSB_P_INPUT_PRIMED \
52 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED) /* 0x82 */
53 #define SLSB_P_INPUT_HALTED \
54 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED) /* 0x8e */
55 #define SLSB_P_INPUT_ERROR \
56 (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR) /* 0x8f */
57 #define SLSB_P_OUTPUT_NOT_INIT \
58 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */
59 #define SLSB_P_OUTPUT_EMPTY \
60 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY) /* 0xa1 */
61 #define SLSB_P_OUTPUT_PENDING \
62 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_PENDING) /* 0xa3 */
63 #define SLSB_CU_OUTPUT_PRIMED \
64 (SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED) /* 0x62 */
65 #define SLSB_P_OUTPUT_HALTED \
66 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED) /* 0xae */
67 #define SLSB_P_OUTPUT_ERROR \
68 (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR) /* 0xaf */
70 #define SLSB_ERROR_DURING_LOOKUP 0xff
72 /* additional CIWs returned by extended Sense-ID */
73 #define CIW_TYPE_EQUEUE 0x3 /* establish QDIO queues */
74 #define CIW_TYPE_AQUEUE 0x4 /* activate QDIO queues */
76 /* flags for st qdio sch data */
77 #define CHSC_FLAG_QDIO_CAPABILITY 0x80
78 #define CHSC_FLAG_VALIDITY 0x40
81 #define QDIO_SIGA_WRITE 0x00
82 #define QDIO_SIGA_READ 0x01
83 #define QDIO_SIGA_SYNC 0x02
84 #define QDIO_SIGA_WRITEM 0x03
85 #define QDIO_SIGA_WRITEQ 0x04
86 #define QDIO_SIGA_QEBSM_FLAG 0x80
88 static inline int do_sqbs(u64 token, unsigned char state, int queue,
89 int *start, int *count)
91 unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
92 unsigned long _ccq = *count;
96 " .insn rsy,0xeb000000008a,%[qs],%[ccq],0(%[state])"
97 : [ccq] "+&d" (_ccq), [qs] "+&d" (_queuestart)
98 : [state] "a" ((unsigned long)state), [token] "d" (token)
99 : "memory", "cc", "1");
100 *count = _ccq & 0xff;
101 *start = _queuestart & 0xff;
103 return (_ccq >> 32) & 0xff;
106 static inline int do_eqbs(u64 token, unsigned char *state, int queue,
107 int *start, int *count, int ack)
109 unsigned long _queuestart = ((unsigned long)queue << 32) | *start;
110 unsigned long _state = (unsigned long)ack << 63;
111 unsigned long _ccq = *count;
115 " .insn rrf,0xb99c0000,%[qs],%[state],%[ccq],0"
116 : [ccq] "+&d" (_ccq), [qs] "+&d" (_queuestart),
117 [state] "+&d" (_state)
118 : [token] "d" (token)
119 : "memory", "cc", "1");
120 *count = _ccq & 0xff;
121 *start = _queuestart & 0xff;
122 *state = _state & 0xff;
124 return (_ccq >> 32) & 0xff;
134 u8 sync_out_after_pci:1;
136 } __attribute__ ((packed));
138 struct qdio_dev_perf_stat {
139 unsigned int adapter_int;
140 unsigned int qdio_int;
141 unsigned int pci_request_int;
143 unsigned int tasklet_inbound;
144 unsigned int tasklet_inbound_resched;
145 unsigned int tasklet_inbound_resched2;
146 unsigned int tasklet_outbound;
148 unsigned int siga_read;
149 unsigned int siga_write;
150 unsigned int siga_sync;
152 unsigned int inbound_call;
153 unsigned int inbound_handler;
154 unsigned int stop_polling;
155 unsigned int inbound_queue_full;
156 unsigned int outbound_call;
157 unsigned int outbound_handler;
158 unsigned int outbound_queue_full;
159 unsigned int fast_requeue;
160 unsigned int target_full;
162 unsigned int eqbs_partial;
164 unsigned int sqbs_partial;
165 unsigned int int_discarded;
166 } ____cacheline_aligned;
168 struct qdio_queue_perf_stat {
169 /* Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128. */
170 unsigned int nr_sbals[8];
171 unsigned int nr_sbal_error;
172 unsigned int nr_sbal_nop;
173 unsigned int nr_sbal_total;
176 enum qdio_irq_poll_states {
180 struct qdio_input_q {
181 /* Batch of SBALs that we processed while polling the queue: */
182 unsigned int batch_start;
183 unsigned int batch_count;
186 struct qdio_output_q {
187 /* PCIs are enabled for the queue */
189 /* cq: use asynchronous output buffers */
191 /* cq: aobs used for particual SBAL */
193 /* cq: sbal state related to asynchronous operation */
194 struct qdio_outbuf_state *sbal_state;
195 /* timer to check for more outbound work */
196 struct timer_list timer;
200 * Note on cache alignment: grouped slsb and write mostly data at the beginning
201 * sbal[] is read-only and starts on a new cacheline followed by read mostly.
207 struct qdio_input_q in;
208 struct qdio_output_q out;
212 * inbound: next buffer the program should check for
213 * outbound: next buffer to check if adapter processed it
217 /* number of buffers in use by the adapter */
218 atomic_t nr_buf_used;
220 /* error condition during a data transfer */
221 unsigned int qdio_error;
223 /* last scan of the queue */
226 struct tasklet_struct tasklet;
227 struct qdio_queue_perf_stat q_stats;
229 struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned;
234 /* bitmask of queue number */
237 /* input or output queue */
240 /* upper-layer program handler */
241 qdio_handler_t (*handler);
243 struct qdio_irq *irq_ptr;
246 * A page is allocated under this pointer and used for slib and sl.
247 * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2.
250 } __attribute__ ((aligned(256)));
254 u32 *dsci; /* address of device state change indicator */
255 struct ccw_device *cdev;
256 struct list_head entry; /* list of thinint devices */
257 struct dentry *debugfs_dev;
259 unsigned long int_parm;
260 struct subchannel_id schid;
261 unsigned long sch_token; /* QEBSM facility */
263 enum qdio_irq_states state;
265 struct siga_flag siga_flag; /* siga sync information from qdioac */
274 struct qdio_ssqd_desc ssqd_desc;
275 void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *);
277 unsigned int scan_threshold; /* used SBALs before tasklet schedule */
278 int perf_stat_enabled;
281 unsigned long chsc_page;
283 struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ];
284 struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ];
285 unsigned int max_input_qs;
286 unsigned int max_output_qs;
288 void (*irq_poll)(struct ccw_device *cdev, unsigned long data);
289 unsigned long poll_state;
291 debug_info_t *debug_area;
292 struct mutex setup_mutex;
293 struct qdio_dev_perf_stat perf_stat;
296 /* helper functions */
297 #define queue_type(q) q->irq_ptr->qib.qfmt
298 #define SCH_NO(q) (q->irq_ptr->schid.sch_no)
300 #define is_thinint_irq(irq) \
301 (irq->qib.qfmt == QDIO_IQDIO_QFMT || \
302 css_general_characteristics.aif_osa)
304 #define qperf(__qdev, __attr) ((__qdev)->perf_stat.(__attr))
306 #define QDIO_PERF_STAT_INC(__irq, __attr) \
308 struct qdio_irq *qdev = __irq; \
309 if (qdev->perf_stat_enabled) \
310 (qdev->perf_stat.__attr)++; \
313 #define qperf_inc(__q, __attr) QDIO_PERF_STAT_INC((__q)->irq_ptr, __attr)
315 static inline void account_sbals_error(struct qdio_q *q, int count)
317 q->q_stats.nr_sbal_error += count;
318 q->q_stats.nr_sbal_total += count;
321 /* the highest iqdio queue is used for multicast */
322 static inline int multicast_outbound(struct qdio_q *q)
324 return (q->irq_ptr->nr_output_qs > 1) &&
325 (q->nr == q->irq_ptr->nr_output_qs - 1);
328 #define pci_out_supported(irq) ((irq)->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED)
329 #define is_qebsm(q) (q->irq_ptr->sch_token != 0)
331 #define need_siga_in(q) (q->irq_ptr->siga_flag.input)
332 #define need_siga_out(q) (q->irq_ptr->siga_flag.output)
333 #define need_siga_sync(q) (unlikely(q->irq_ptr->siga_flag.sync))
334 #define need_siga_sync_after_ai(q) \
335 (unlikely(q->irq_ptr->siga_flag.sync_after_ai))
336 #define need_siga_sync_out_after_pci(q) \
337 (unlikely(q->irq_ptr->siga_flag.sync_out_after_pci))
339 #define for_each_input_queue(irq_ptr, q, i) \
340 for (i = 0; i < irq_ptr->nr_input_qs && \
341 ({ q = irq_ptr->input_qs[i]; 1; }); i++)
342 #define for_each_output_queue(irq_ptr, q, i) \
343 for (i = 0; i < irq_ptr->nr_output_qs && \
344 ({ q = irq_ptr->output_qs[i]; 1; }); i++)
346 #define add_buf(bufnr, inc) QDIO_BUFNR((bufnr) + (inc))
347 #define next_buf(bufnr) add_buf(bufnr, 1)
348 #define sub_buf(bufnr, dec) QDIO_BUFNR((bufnr) - (dec))
349 #define prev_buf(bufnr) sub_buf(bufnr, 1)
351 #define queue_irqs_enabled(q) \
352 (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0)
353 #define queue_irqs_disabled(q) \
354 (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0)
356 extern u64 last_ai_time;
358 /* prototypes for thin interrupt */
359 int qdio_establish_thinint(struct qdio_irq *irq_ptr);
360 void qdio_shutdown_thinint(struct qdio_irq *irq_ptr);
361 void tiqdio_add_device(struct qdio_irq *irq_ptr);
362 void tiqdio_remove_device(struct qdio_irq *irq_ptr);
363 void tiqdio_inbound_processing(unsigned long q);
364 int qdio_thinint_init(void);
365 void qdio_thinint_exit(void);
366 int test_nonshared_ind(struct qdio_irq *);
368 /* prototypes for setup */
369 void qdio_inbound_processing(unsigned long data);
370 void qdio_outbound_processing(unsigned long data);
371 void qdio_outbound_timer(struct timer_list *t);
372 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
374 int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs,
376 void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr);
377 int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr,
378 struct subchannel_id *schid,
379 struct qdio_ssqd_desc *data);
380 int qdio_setup_irq(struct qdio_irq *irq_ptr, struct qdio_initialize *init_data);
381 void qdio_shutdown_irq(struct qdio_irq *irq);
382 void qdio_print_subchannel_info(struct qdio_irq *irq_ptr);
383 void qdio_free_queues(struct qdio_irq *irq_ptr);
384 void qdio_free_async_data(struct qdio_irq *irq_ptr);
385 int qdio_setup_init(void);
386 void qdio_setup_exit(void);
387 int qdio_enable_async_operation(struct qdio_output_q *q);
388 void qdio_disable_async_operation(struct qdio_output_q *q);
389 struct qaob *qdio_allocate_aob(void);
391 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
392 unsigned char *state);
393 #endif /* _CIO_QDIO_H */