1 /*
2  * QLogic Fibre Channel HBA Driver
3  * Copyright (c)  2003-2014 QLogic Corporation
4  *
5  * See LICENSE.qla2xxx for copyright and licensing details.
6  */
7 
8 #include "qla_target.h"
9 /**
10  * qla24xx_calc_iocbs() - Determine number of Command Type 3 and
11  * Continuation Type 1 IOCBs to allocate.
12  *
13  * @vha: HA context
14  * @dsds: number of data segment decriptors needed
15  *
16  * Returns the number of IOCB entries needed to store @dsds.
17  */
18 static inline uint16_t
19 qla24xx_calc_iocbs(scsi_qla_host_t *vha, uint16_t dsds)
20 {
21 	uint16_t iocbs;
22 
23 	iocbs = 1;
24 	if (dsds > 1) {
25 		iocbs += (dsds - 1) / 5;
26 		if ((dsds - 1) % 5)
27 			iocbs++;
28 	}
29 	return iocbs;
30 }
31 
32 /*
33  * qla2x00_debounce_register
34  *      Debounce register.
35  *
36  * Input:
37  *      port = register address.
38  *
39  * Returns:
40  *      register value.
41  */
42 static __inline__ uint16_t
43 qla2x00_debounce_register(volatile uint16_t __iomem *addr)
44 {
45 	volatile uint16_t first;
46 	volatile uint16_t second;
47 
48 	do {
49 		first = RD_REG_WORD(addr);
50 		barrier();
51 		cpu_relax();
52 		second = RD_REG_WORD(addr);
53 	} while (first != second);
54 
55 	return (first);
56 }
57 
58 static inline void
59 qla2x00_poll(struct rsp_que *rsp)
60 {
61 	struct qla_hw_data *ha = rsp->hw;
62 
63 	if (IS_P3P_TYPE(ha))
64 		qla82xx_poll(0, rsp);
65 	else
66 		ha->isp_ops->intr_handler(0, rsp);
67 }
68 
69 static inline uint8_t *
70 host_to_fcp_swap(uint8_t *fcp, uint32_t bsize)
71 {
72        uint32_t *ifcp = (uint32_t *) fcp;
73        uint32_t *ofcp = (uint32_t *) fcp;
74        uint32_t iter = bsize >> 2;
75 
76        for (; iter ; iter--)
77                *ofcp++ = swab32(*ifcp++);
78 
79        return fcp;
80 }
81 
82 static inline void
83 host_to_adap(uint8_t *src, uint8_t *dst, uint32_t bsize)
84 {
85 	uint32_t *isrc = (uint32_t *) src;
86 	__le32 *odest = (__le32 *) dst;
87 	uint32_t iter = bsize >> 2;
88 
89 	for ( ; iter--; isrc++)
90 		*odest++ = cpu_to_le32(*isrc);
91 }
92 
93 static inline void
94 qla2x00_set_reserved_loop_ids(struct qla_hw_data *ha)
95 {
96 	int i;
97 
98 	if (IS_FWI2_CAPABLE(ha))
99 		return;
100 
101 	for (i = 0; i < SNS_FIRST_LOOP_ID; i++)
102 		set_bit(i, ha->loop_id_map);
103 	set_bit(MANAGEMENT_SERVER, ha->loop_id_map);
104 	set_bit(BROADCAST, ha->loop_id_map);
105 }
106 
107 static inline int
108 qla2x00_is_reserved_id(scsi_qla_host_t *vha, uint16_t loop_id)
109 {
110 	struct qla_hw_data *ha = vha->hw;
111 	if (IS_FWI2_CAPABLE(ha))
112 		return (loop_id > NPH_LAST_HANDLE);
113 
114 	return ((loop_id > ha->max_loop_id && loop_id < SNS_FIRST_LOOP_ID) ||
115 	    loop_id == MANAGEMENT_SERVER || loop_id == BROADCAST);
116 }
117 
118 static inline void
119 qla2x00_clear_loop_id(fc_port_t *fcport) {
120 	struct qla_hw_data *ha = fcport->vha->hw;
121 
122 	if (fcport->loop_id == FC_NO_LOOP_ID ||
123 	    qla2x00_is_reserved_id(fcport->vha, fcport->loop_id))
124 		return;
125 
126 	clear_bit(fcport->loop_id, ha->loop_id_map);
127 	fcport->loop_id = FC_NO_LOOP_ID;
128 }
129 
130 static inline void
131 qla2x00_clean_dsd_pool(struct qla_hw_data *ha, struct crc_context *ctx)
132 {
133 	struct dsd_dma *dsd, *tdsd;
134 
135 	/* clean up allocated prev pool */
136 	list_for_each_entry_safe(dsd, tdsd, &ctx->dsd_list, list) {
137 		dma_pool_free(ha->dl_dma_pool, dsd->dsd_addr,
138 		    dsd->dsd_list_dma);
139 		list_del(&dsd->list);
140 		kfree(dsd);
141 	}
142 	INIT_LIST_HEAD(&ctx->dsd_list);
143 }
144 
145 static inline void
146 qla2x00_set_fcport_state(fc_port_t *fcport, int state)
147 {
148 	int old_state;
149 
150 	old_state = atomic_read(&fcport->state);
151 	atomic_set(&fcport->state, state);
152 
153 	/* Don't print state transitions during initial allocation of fcport */
154 	if (old_state && old_state != state) {
155 		ql_dbg(ql_dbg_disc, fcport->vha, 0x207d,
156 		    "FCPort %8phC state transitioned from %s to %s - "
157 			"portid=%02x%02x%02x.\n", fcport->port_name,
158 		    port_state_str[old_state], port_state_str[state],
159 		    fcport->d_id.b.domain, fcport->d_id.b.area,
160 		    fcport->d_id.b.al_pa);
161 	}
162 }
163 
164 static inline int
165 qla2x00_hba_err_chk_enabled(srb_t *sp)
166 {
167 	/*
168 	 * Uncomment when corresponding SCSI changes are done.
169 	 *
170 	if (!sp->cmd->prot_chk)
171 		return 0;
172 	 *
173 	 */
174 	switch (scsi_get_prot_op(GET_CMD_SP(sp))) {
175 	case SCSI_PROT_READ_STRIP:
176 	case SCSI_PROT_WRITE_INSERT:
177 		if (ql2xenablehba_err_chk >= 1)
178 			return 1;
179 		break;
180 	case SCSI_PROT_READ_PASS:
181 	case SCSI_PROT_WRITE_PASS:
182 		if (ql2xenablehba_err_chk >= 2)
183 			return 1;
184 		break;
185 	case SCSI_PROT_READ_INSERT:
186 	case SCSI_PROT_WRITE_STRIP:
187 		return 1;
188 	}
189 	return 0;
190 }
191 
192 static inline int
193 qla2x00_reset_active(scsi_qla_host_t *vha)
194 {
195 	scsi_qla_host_t *base_vha = pci_get_drvdata(vha->hw->pdev);
196 
197 	/* Test appropriate base-vha and vha flags. */
198 	return test_bit(ISP_ABORT_NEEDED, &base_vha->dpc_flags) ||
199 	    test_bit(ABORT_ISP_ACTIVE, &base_vha->dpc_flags) ||
200 	    test_bit(ISP_ABORT_RETRY, &base_vha->dpc_flags) ||
201 	    test_bit(ISP_ABORT_NEEDED, &vha->dpc_flags) ||
202 	    test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags);
203 }
204 
205 static inline int
206 qla2x00_chip_is_down(scsi_qla_host_t *vha)
207 {
208 	return (qla2x00_reset_active(vha) || !vha->hw->flags.fw_started);
209 }
210 
211 static inline srb_t *
212 qla2xxx_get_qpair_sp(scsi_qla_host_t *vha, struct qla_qpair *qpair,
213     fc_port_t *fcport, gfp_t flag)
214 {
215 	srb_t *sp = NULL;
216 	uint8_t bail;
217 
218 	QLA_QPAIR_MARK_BUSY(qpair, bail);
219 	if (unlikely(bail))
220 		return NULL;
221 
222 	sp = mempool_alloc(qpair->srb_mempool, flag);
223 	if (!sp)
224 		goto done;
225 
226 	memset(sp, 0, sizeof(*sp));
227 	sp->fcport = fcport;
228 	sp->iocbs = 1;
229 	sp->vha = vha;
230 	sp->qpair = qpair;
231 	sp->cmd_type = TYPE_SRB;
232 	INIT_LIST_HEAD(&sp->elem);
233 
234 done:
235 	if (!sp)
236 		QLA_QPAIR_MARK_NOT_BUSY(qpair);
237 	return sp;
238 }
239 
240 static inline void
241 qla2xxx_rel_qpair_sp(struct qla_qpair *qpair, srb_t *sp)
242 {
243 	mempool_free(sp, qpair->srb_mempool);
244 	QLA_QPAIR_MARK_NOT_BUSY(qpair);
245 }
246 
247 static inline srb_t *
248 qla2x00_get_sp(scsi_qla_host_t *vha, fc_port_t *fcport, gfp_t flag)
249 {
250 	srb_t *sp = NULL;
251 	uint8_t bail;
252 	struct qla_qpair *qpair;
253 
254 	QLA_VHA_MARK_BUSY(vha, bail);
255 	if (unlikely(bail))
256 		return NULL;
257 
258 	qpair = vha->hw->base_qpair;
259 	sp = qla2xxx_get_qpair_sp(vha, qpair, fcport, flag);
260 	if (!sp)
261 		goto done;
262 
263 	sp->vha = vha;
264 done:
265 	if (!sp)
266 		QLA_VHA_MARK_NOT_BUSY(vha);
267 	return sp;
268 }
269 
270 static inline void
271 qla2x00_rel_sp(srb_t *sp)
272 {
273 	QLA_VHA_MARK_NOT_BUSY(sp->vha);
274 	qla2xxx_rel_qpair_sp(sp->qpair, sp);
275 }
276 
277 static inline void
278 qla2x00_init_timer(srb_t *sp, unsigned long tmo)
279 {
280 	timer_setup(&sp->u.iocb_cmd.timer, qla2x00_sp_timeout, 0);
281 	sp->u.iocb_cmd.timer.expires = jiffies + tmo * HZ;
282 	sp->free = qla2x00_sp_free;
283 	init_completion(&sp->comp);
284 	if (IS_QLAFX00(sp->vha->hw) && (sp->type == SRB_FXIOCB_DCMD))
285 		init_completion(&sp->u.iocb_cmd.u.fxiocb.fxiocb_comp);
286 	add_timer(&sp->u.iocb_cmd.timer);
287 }
288 
289 static inline int
290 qla2x00_gid_list_size(struct qla_hw_data *ha)
291 {
292 	if (IS_QLAFX00(ha))
293 		return sizeof(uint32_t) * 32;
294 	else
295 		return sizeof(struct gid_list_info) * ha->max_fibre_devices;
296 }
297 
298 static inline void
299 qla2x00_handle_mbx_completion(struct qla_hw_data *ha, int status)
300 {
301 	if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
302 	    (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
303 		set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
304 		clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
305 		complete(&ha->mbx_intr_comp);
306 	}
307 }
308 
309 static inline void
310 qla2x00_set_retry_delay_timestamp(fc_port_t *fcport, uint16_t retry_delay)
311 {
312 	if (retry_delay)
313 		fcport->retry_delay_timestamp = jiffies +
314 		    (retry_delay * HZ / 10);
315 }
316 
317 static inline bool
318 qla_is_exch_offld_enabled(struct scsi_qla_host *vha)
319 {
320 	if (qla_ini_mode_enabled(vha) &&
321 	    (vha->ql2xiniexchg > FW_DEF_EXCHANGES_CNT))
322 		return true;
323 	else if (qla_tgt_mode_enabled(vha) &&
324 	    (vha->ql2xexchoffld > FW_DEF_EXCHANGES_CNT))
325 		return true;
326 	else if (qla_dual_mode_enabled(vha) &&
327 	    ((vha->ql2xiniexchg + vha->ql2xexchoffld) > FW_DEF_EXCHANGES_CNT))
328 		return true;
329 	else
330 		return false;
331 }
332 
333 static inline void
334 qla_cpu_update(struct qla_qpair *qpair, uint16_t cpuid)
335 {
336 	qpair->cpuid = cpuid;
337 
338 	if (!list_empty(&qpair->hints_list)) {
339 		struct qla_qpair_hint *h;
340 
341 		list_for_each_entry(h, &qpair->hints_list, hint_elem)
342 			h->cpuid = qpair->cpuid;
343 	}
344 }
345 
346 static inline struct qla_qpair_hint *
347 qla_qpair_to_hint(struct qla_tgt *tgt, struct qla_qpair *qpair)
348 {
349 	struct qla_qpair_hint *h;
350 	u16 i;
351 
352 	for (i = 0; i < tgt->ha->max_qpairs + 1; i++) {
353 		h = &tgt->qphints[i];
354 		if (h->qpair == qpair)
355 			return h;
356 	}
357 
358 	return NULL;
359 }
360 
361 static inline void
362 qla_83xx_start_iocbs(struct qla_qpair *qpair)
363 {
364 	struct req_que *req = qpair->req;
365 
366 	req->ring_index++;
367 	if (req->ring_index == req->length) {
368 		req->ring_index = 0;
369 		req->ring_ptr = req->ring;
370 	} else
371 		req->ring_ptr++;
372 
373 	WRT_REG_DWORD(req->req_q_in, req->ring_index);
374 }
375