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_clean_dsd_pool(struct qla_hw_data *ha, struct crc_context *ctx)
95 {
96 	struct dsd_dma *dsd, *tdsd;
97 
98 	/* clean up allocated prev pool */
99 	list_for_each_entry_safe(dsd, tdsd, &ctx->dsd_list, list) {
100 		dma_pool_free(ha->dl_dma_pool, dsd->dsd_addr,
101 		    dsd->dsd_list_dma);
102 		list_del(&dsd->list);
103 		kfree(dsd);
104 	}
105 	INIT_LIST_HEAD(&ctx->dsd_list);
106 }
107 
108 static inline int
109 qla2x00_hba_err_chk_enabled(srb_t *sp)
110 {
111 	/*
112 	 * Uncomment when corresponding SCSI changes are done.
113 	 *
114 	if (!sp->cmd->prot_chk)
115 		return 0;
116 	 *
117 	 */
118 	switch (scsi_get_prot_op(GET_CMD_SP(sp))) {
119 	case SCSI_PROT_READ_STRIP:
120 	case SCSI_PROT_WRITE_INSERT:
121 		if (ql2xenablehba_err_chk >= 1)
122 			return 1;
123 		break;
124 	case SCSI_PROT_READ_PASS:
125 	case SCSI_PROT_WRITE_PASS:
126 		if (ql2xenablehba_err_chk >= 2)
127 			return 1;
128 		break;
129 	case SCSI_PROT_READ_INSERT:
130 	case SCSI_PROT_WRITE_STRIP:
131 		return 1;
132 	}
133 	return 0;
134 }
135 
136 static inline int
137 qla2x00_reset_active(scsi_qla_host_t *vha)
138 {
139 	scsi_qla_host_t *base_vha = pci_get_drvdata(vha->hw->pdev);
140 
141 	/* Test appropriate base-vha and vha flags. */
142 	return test_bit(ISP_ABORT_NEEDED, &base_vha->dpc_flags) ||
143 	    test_bit(ABORT_ISP_ACTIVE, &base_vha->dpc_flags) ||
144 	    test_bit(ISP_ABORT_RETRY, &base_vha->dpc_flags) ||
145 	    test_bit(ISP_ABORT_NEEDED, &vha->dpc_flags) ||
146 	    test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags);
147 }
148 
149 static inline int
150 qla2x00_chip_is_down(scsi_qla_host_t *vha)
151 {
152 	return (qla2x00_reset_active(vha) || !vha->hw->flags.fw_started);
153 }
154 
155 static void qla2xxx_init_sp(srb_t *sp, scsi_qla_host_t *vha,
156 			    struct qla_qpair *qpair, fc_port_t *fcport)
157 {
158 	memset(sp, 0, sizeof(*sp));
159 	sp->fcport = fcport;
160 	sp->iocbs = 1;
161 	sp->vha = vha;
162 	sp->qpair = qpair;
163 	sp->cmd_type = TYPE_SRB;
164 	INIT_LIST_HEAD(&sp->elem);
165 }
166 
167 static inline srb_t *
168 qla2xxx_get_qpair_sp(scsi_qla_host_t *vha, struct qla_qpair *qpair,
169     fc_port_t *fcport, gfp_t flag)
170 {
171 	srb_t *sp = NULL;
172 	uint8_t bail;
173 
174 	QLA_QPAIR_MARK_BUSY(qpair, bail);
175 	if (unlikely(bail))
176 		return NULL;
177 
178 	sp = mempool_alloc(qpair->srb_mempool, flag);
179 	if (sp)
180 		qla2xxx_init_sp(sp, vha, qpair, fcport);
181 	else
182 		QLA_QPAIR_MARK_NOT_BUSY(qpair);
183 	return sp;
184 }
185 
186 static inline void
187 qla2xxx_rel_qpair_sp(struct qla_qpair *qpair, srb_t *sp)
188 {
189 	sp->qpair = NULL;
190 	mempool_free(sp, qpair->srb_mempool);
191 	QLA_QPAIR_MARK_NOT_BUSY(qpair);
192 }
193 
194 static inline srb_t *
195 qla2x00_get_sp(scsi_qla_host_t *vha, fc_port_t *fcport, gfp_t flag)
196 {
197 	srb_t *sp = NULL;
198 	uint8_t bail;
199 	struct qla_qpair *qpair;
200 
201 	QLA_VHA_MARK_BUSY(vha, bail);
202 	if (unlikely(bail))
203 		return NULL;
204 
205 	qpair = vha->hw->base_qpair;
206 	sp = qla2xxx_get_qpair_sp(vha, qpair, fcport, flag);
207 	if (!sp)
208 		goto done;
209 
210 	sp->vha = vha;
211 done:
212 	if (!sp)
213 		QLA_VHA_MARK_NOT_BUSY(vha);
214 	return sp;
215 }
216 
217 static inline void
218 qla2x00_rel_sp(srb_t *sp)
219 {
220 	QLA_VHA_MARK_NOT_BUSY(sp->vha);
221 	qla2xxx_rel_qpair_sp(sp->qpair, sp);
222 }
223 
224 static inline int
225 qla2x00_gid_list_size(struct qla_hw_data *ha)
226 {
227 	if (IS_QLAFX00(ha))
228 		return sizeof(uint32_t) * 32;
229 	else
230 		return sizeof(struct gid_list_info) * ha->max_fibre_devices;
231 }
232 
233 static inline void
234 qla2x00_handle_mbx_completion(struct qla_hw_data *ha, int status)
235 {
236 	if (test_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags) &&
237 	    (status & MBX_INTERRUPT) && ha->flags.mbox_int) {
238 		set_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
239 		clear_bit(MBX_INTR_WAIT, &ha->mbx_cmd_flags);
240 		complete(&ha->mbx_intr_comp);
241 	}
242 }
243 
244 static inline void
245 qla2x00_set_retry_delay_timestamp(fc_port_t *fcport, uint16_t retry_delay)
246 {
247 	if (retry_delay)
248 		fcport->retry_delay_timestamp = jiffies +
249 		    (retry_delay * HZ / 10);
250 }
251 
252 static inline bool
253 qla_is_exch_offld_enabled(struct scsi_qla_host *vha)
254 {
255 	if (qla_ini_mode_enabled(vha) &&
256 	    (vha->ql2xiniexchg > FW_DEF_EXCHANGES_CNT))
257 		return true;
258 	else if (qla_tgt_mode_enabled(vha) &&
259 	    (vha->ql2xexchoffld > FW_DEF_EXCHANGES_CNT))
260 		return true;
261 	else if (qla_dual_mode_enabled(vha) &&
262 	    ((vha->ql2xiniexchg + vha->ql2xexchoffld) > FW_DEF_EXCHANGES_CNT))
263 		return true;
264 	else
265 		return false;
266 }
267 
268 static inline void
269 qla_cpu_update(struct qla_qpair *qpair, uint16_t cpuid)
270 {
271 	qpair->cpuid = cpuid;
272 
273 	if (!list_empty(&qpair->hints_list)) {
274 		struct qla_qpair_hint *h;
275 
276 		list_for_each_entry(h, &qpair->hints_list, hint_elem)
277 			h->cpuid = qpair->cpuid;
278 	}
279 }
280 
281 static inline struct qla_qpair_hint *
282 qla_qpair_to_hint(struct qla_tgt *tgt, struct qla_qpair *qpair)
283 {
284 	struct qla_qpair_hint *h;
285 	u16 i;
286 
287 	for (i = 0; i < tgt->ha->max_qpairs + 1; i++) {
288 		h = &tgt->qphints[i];
289 		if (h->qpair == qpair)
290 			return h;
291 	}
292 
293 	return NULL;
294 }
295 
296 static inline void
297 qla_83xx_start_iocbs(struct qla_qpair *qpair)
298 {
299 	struct req_que *req = qpair->req;
300 
301 	req->ring_index++;
302 	if (req->ring_index == req->length) {
303 		req->ring_index = 0;
304 		req->ring_ptr = req->ring;
305 	} else
306 		req->ring_ptr++;
307 
308 	WRT_REG_DWORD(req->req_q_in, req->ring_index);
309 }
310 
311 static inline int
312 qla2xxx_get_fc4_priority(struct scsi_qla_host *vha)
313 {
314 	uint32_t data;
315 
316 	data =
317 	    ((uint8_t *)vha->hw->nvram)[NVRAM_DUAL_FCP_NVME_FLAG_OFFSET];
318 
319 
320 	return (data >> 6) & BIT_0 ? FC4_PRIORITY_FCP : FC4_PRIORITY_NVME;
321 }
322