Commit | Line | Data |
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afaf5a2d DS |
1 | /* |
2 | * QLogic iSCSI HBA Driver | |
3 | * Copyright (c) 2003-2006 QLogic Corporation | |
4 | * | |
5 | * See LICENSE.qla4xxx for copyright and licensing details. | |
6 | */ | |
7 | ||
8 | #include "ql4_def.h" | |
e08c182c DS |
9 | #include "ql4_glbl.h" |
10 | #include "ql4_dbg.h" | |
11 | #include "ql4_inline.h" | |
12 | ||
afaf5a2d DS |
13 | #include <scsi/scsi_tcq.h> |
14 | ||
16ed55f9 KH |
15 | static int |
16 | qla4xxx_space_in_req_ring(struct scsi_qla_host *ha, uint16_t req_cnt) | |
17 | { | |
18 | uint16_t cnt; | |
19 | ||
20 | /* Calculate number of free request entries. */ | |
21 | if ((req_cnt + 2) >= ha->req_q_count) { | |
22 | cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out); | |
23 | if (ha->request_in < cnt) | |
24 | ha->req_q_count = cnt - ha->request_in; | |
25 | else | |
26 | ha->req_q_count = REQUEST_QUEUE_DEPTH - | |
27 | (ha->request_in - cnt); | |
28 | } | |
29 | ||
30 | /* Check if room for request in request ring. */ | |
31 | if ((req_cnt + 2) < ha->req_q_count) | |
32 | return 1; | |
33 | else | |
34 | return 0; | |
35 | } | |
36 | ||
37 | static void qla4xxx_advance_req_ring_ptr(struct scsi_qla_host *ha) | |
38 | { | |
39 | /* Advance request queue pointer */ | |
40 | if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) { | |
41 | ha->request_in = 0; | |
42 | ha->request_ptr = ha->request_ring; | |
43 | } else { | |
44 | ha->request_in++; | |
45 | ha->request_ptr++; | |
46 | } | |
47 | } | |
48 | ||
afaf5a2d DS |
49 | /** |
50 | * qla4xxx_get_req_pkt - returns a valid entry in request queue. | |
51 | * @ha: Pointer to host adapter structure. | |
52 | * @queue_entry: Pointer to pointer to queue entry structure | |
53 | * | |
54 | * This routine performs the following tasks: | |
55 | * - returns the current request_in pointer (if queue not full) | |
56 | * - advances the request_in pointer | |
57 | * - checks for queue full | |
58 | **/ | |
47975477 AB |
59 | static int qla4xxx_get_req_pkt(struct scsi_qla_host *ha, |
60 | struct queue_entry **queue_entry) | |
afaf5a2d | 61 | { |
16ed55f9 | 62 | uint16_t req_cnt = 1; |
afaf5a2d | 63 | |
16ed55f9 KH |
64 | if (qla4xxx_space_in_req_ring(ha, req_cnt)) { |
65 | *queue_entry = ha->request_ptr; | |
afaf5a2d | 66 | memset(*queue_entry, 0, sizeof(**queue_entry)); |
16ed55f9 KH |
67 | |
68 | qla4xxx_advance_req_ring_ptr(ha); | |
69 | ha->req_q_count -= req_cnt; | |
70 | return QLA_SUCCESS; | |
afaf5a2d DS |
71 | } |
72 | ||
16ed55f9 | 73 | return QLA_ERROR; |
afaf5a2d DS |
74 | } |
75 | ||
76 | /** | |
77 | * qla4xxx_send_marker_iocb - issues marker iocb to HBA | |
78 | * @ha: Pointer to host adapter structure. | |
79 | * @ddb_entry: Pointer to device database entry | |
80 | * @lun: SCSI LUN | |
81 | * @marker_type: marker identifier | |
82 | * | |
83 | * This routine issues a marker IOCB. | |
84 | **/ | |
9d562913 DS |
85 | int qla4xxx_send_marker_iocb(struct scsi_qla_host *ha, |
86 | struct ddb_entry *ddb_entry, int lun, uint16_t mrkr_mod) | |
afaf5a2d | 87 | { |
1c3f0b8e | 88 | struct qla4_marker_entry *marker_entry; |
afaf5a2d DS |
89 | unsigned long flags = 0; |
90 | uint8_t status = QLA_SUCCESS; | |
91 | ||
92 | /* Acquire hardware specific lock */ | |
93 | spin_lock_irqsave(&ha->hardware_lock, flags); | |
94 | ||
95 | /* Get pointer to the queue entry for the marker */ | |
96 | if (qla4xxx_get_req_pkt(ha, (struct queue_entry **) &marker_entry) != | |
97 | QLA_SUCCESS) { | |
98 | status = QLA_ERROR; | |
99 | goto exit_send_marker; | |
100 | } | |
101 | ||
102 | /* Put the marker in the request queue */ | |
103 | marker_entry->hdr.entryType = ET_MARKER; | |
104 | marker_entry->hdr.entryCount = 1; | |
105 | marker_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index); | |
9d562913 | 106 | marker_entry->modifier = cpu_to_le16(mrkr_mod); |
afaf5a2d DS |
107 | int_to_scsilun(lun, &marker_entry->lun); |
108 | wmb(); | |
109 | ||
110 | /* Tell ISP it's got a new I/O request */ | |
111 | writel(ha->request_in, &ha->reg->req_q_in); | |
112 | readl(&ha->reg->req_q_in); | |
113 | ||
114 | exit_send_marker: | |
115 | spin_unlock_irqrestore(&ha->hardware_lock, flags); | |
116 | return status; | |
117 | } | |
118 | ||
16ed55f9 KH |
119 | static struct continuation_t1_entry * |
120 | qla4xxx_alloc_cont_entry(struct scsi_qla_host *ha) | |
afaf5a2d DS |
121 | { |
122 | struct continuation_t1_entry *cont_entry; | |
123 | ||
124 | cont_entry = (struct continuation_t1_entry *)ha->request_ptr; | |
125 | ||
16ed55f9 | 126 | qla4xxx_advance_req_ring_ptr(ha); |
afaf5a2d DS |
127 | |
128 | /* Load packet defaults */ | |
129 | cont_entry->hdr.entryType = ET_CONTINUE; | |
130 | cont_entry->hdr.entryCount = 1; | |
131 | cont_entry->hdr.systemDefined = (uint8_t) cpu_to_le16(ha->request_in); | |
132 | ||
133 | return cont_entry; | |
134 | } | |
135 | ||
47975477 | 136 | static uint16_t qla4xxx_calc_request_entries(uint16_t dsds) |
afaf5a2d DS |
137 | { |
138 | uint16_t iocbs; | |
139 | ||
140 | iocbs = 1; | |
141 | if (dsds > COMMAND_SEG) { | |
142 | iocbs += (dsds - COMMAND_SEG) / CONTINUE_SEG; | |
143 | if ((dsds - COMMAND_SEG) % CONTINUE_SEG) | |
144 | iocbs++; | |
145 | } | |
146 | return iocbs; | |
147 | } | |
148 | ||
47975477 AB |
149 | static void qla4xxx_build_scsi_iocbs(struct srb *srb, |
150 | struct command_t3_entry *cmd_entry, | |
151 | uint16_t tot_dsds) | |
afaf5a2d DS |
152 | { |
153 | struct scsi_qla_host *ha; | |
154 | uint16_t avail_dsds; | |
155 | struct data_seg_a64 *cur_dsd; | |
156 | struct scsi_cmnd *cmd; | |
5f7186c8 FT |
157 | struct scatterlist *sg; |
158 | int i; | |
afaf5a2d DS |
159 | |
160 | cmd = srb->cmd; | |
161 | ha = srb->ha; | |
162 | ||
5f7186c8 | 163 | if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) { |
afaf5a2d DS |
164 | /* No data being transferred */ |
165 | cmd_entry->ttlByteCnt = __constant_cpu_to_le32(0); | |
166 | return; | |
167 | } | |
168 | ||
169 | avail_dsds = COMMAND_SEG; | |
170 | cur_dsd = (struct data_seg_a64 *) & (cmd_entry->dataseg[0]); | |
171 | ||
5f7186c8 FT |
172 | scsi_for_each_sg(cmd, sg, tot_dsds, i) { |
173 | dma_addr_t sle_dma; | |
174 | ||
175 | /* Allocate additional continuation packets? */ | |
176 | if (avail_dsds == 0) { | |
177 | struct continuation_t1_entry *cont_entry; | |
178 | ||
179 | cont_entry = qla4xxx_alloc_cont_entry(ha); | |
180 | cur_dsd = | |
181 | (struct data_seg_a64 *) | |
182 | &cont_entry->dataseg[0]; | |
183 | avail_dsds = CONTINUE_SEG; | |
afaf5a2d | 184 | } |
5f7186c8 FT |
185 | |
186 | sle_dma = sg_dma_address(sg); | |
187 | cur_dsd->base.addrLow = cpu_to_le32(LSDW(sle_dma)); | |
188 | cur_dsd->base.addrHigh = cpu_to_le32(MSDW(sle_dma)); | |
189 | cur_dsd->count = cpu_to_le32(sg_dma_len(sg)); | |
190 | avail_dsds--; | |
191 | ||
192 | cur_dsd++; | |
afaf5a2d DS |
193 | } |
194 | } | |
195 | ||
196 | /** | |
197 | * qla4xxx_send_command_to_isp - issues command to HBA | |
198 | * @ha: pointer to host adapter structure. | |
199 | * @srb: pointer to SCSI Request Block to be sent to ISP | |
200 | * | |
201 | * This routine is called by qla4xxx_queuecommand to build an ISP | |
202 | * command and pass it to the ISP for execution. | |
203 | **/ | |
204 | int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb) | |
205 | { | |
206 | struct scsi_cmnd *cmd = srb->cmd; | |
207 | struct ddb_entry *ddb_entry; | |
208 | struct command_t3_entry *cmd_entry; | |
5f7186c8 | 209 | int nseg; |
afaf5a2d DS |
210 | uint16_t tot_dsds; |
211 | uint16_t req_cnt; | |
afaf5a2d | 212 | unsigned long flags; |
afaf5a2d DS |
213 | uint32_t index; |
214 | char tag[2]; | |
215 | ||
216 | /* Get real lun and adapter */ | |
217 | ddb_entry = srb->ddb; | |
218 | ||
afaf5a2d DS |
219 | tot_dsds = 0; |
220 | ||
221 | /* Acquire hardware specific lock */ | |
222 | spin_lock_irqsave(&ha->hardware_lock, flags); | |
223 | ||
224 | index = (uint32_t)cmd->request->tag; | |
225 | ||
16ed55f9 KH |
226 | /* |
227 | * Check to see if adapter is online before placing request on | |
228 | * request queue. If a reset occurs and a request is in the queue, | |
229 | * the firmware will still attempt to process the request, retrieving | |
230 | * garbage for pointers. | |
231 | */ | |
232 | if (!test_bit(AF_ONLINE, &ha->flags)) { | |
233 | DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! " | |
234 | "Do not issue command.\n", | |
235 | ha->host_no, __func__)); | |
236 | goto queuing_error; | |
237 | } | |
238 | ||
afaf5a2d | 239 | /* Calculate the number of request entries needed. */ |
5f7186c8 FT |
240 | nseg = scsi_dma_map(cmd); |
241 | if (nseg < 0) | |
242 | goto queuing_error; | |
243 | tot_dsds = nseg; | |
244 | ||
afaf5a2d | 245 | req_cnt = qla4xxx_calc_request_entries(tot_dsds); |
16ed55f9 | 246 | if (!qla4xxx_space_in_req_ring(ha, req_cnt)) |
afaf5a2d DS |
247 | goto queuing_error; |
248 | ||
249 | /* total iocbs active */ | |
250 | if ((ha->iocb_cnt + req_cnt) >= REQUEST_QUEUE_DEPTH) | |
251 | goto queuing_error; | |
252 | ||
253 | /* Build command packet */ | |
254 | cmd_entry = (struct command_t3_entry *) ha->request_ptr; | |
255 | memset(cmd_entry, 0, sizeof(struct command_t3_entry)); | |
256 | cmd_entry->hdr.entryType = ET_COMMAND; | |
257 | cmd_entry->handle = cpu_to_le32(index); | |
258 | cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index); | |
259 | cmd_entry->connection_id = cpu_to_le16(ddb_entry->connection_id); | |
260 | ||
261 | int_to_scsilun(cmd->device->lun, &cmd_entry->lun); | |
262 | cmd_entry->cmdSeqNum = cpu_to_le32(ddb_entry->CmdSn); | |
5f7186c8 | 263 | cmd_entry->ttlByteCnt = cpu_to_le32(scsi_bufflen(cmd)); |
afaf5a2d DS |
264 | memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len); |
265 | cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds); | |
266 | cmd_entry->hdr.entryCount = req_cnt; | |
267 | ||
268 | /* Set data transfer direction control flags | |
269 | * NOTE: Look at data_direction bits iff there is data to be | |
270 | * transferred, as the data direction bit is sometimed filled | |
271 | * in when there is no data to be transferred */ | |
272 | cmd_entry->control_flags = CF_NO_DATA; | |
5f7186c8 | 273 | if (scsi_bufflen(cmd)) { |
afaf5a2d DS |
274 | if (cmd->sc_data_direction == DMA_TO_DEVICE) |
275 | cmd_entry->control_flags = CF_WRITE; | |
276 | else if (cmd->sc_data_direction == DMA_FROM_DEVICE) | |
277 | cmd_entry->control_flags = CF_READ; | |
d915058f | 278 | |
5f7186c8 | 279 | ha->bytes_xfered += scsi_bufflen(cmd); |
d915058f DS |
280 | if (ha->bytes_xfered & ~0xFFFFF){ |
281 | ha->total_mbytes_xferred += ha->bytes_xfered >> 20; | |
282 | ha->bytes_xfered &= 0xFFFFF; | |
283 | } | |
afaf5a2d DS |
284 | } |
285 | ||
286 | /* Set tagged queueing control flags */ | |
287 | cmd_entry->control_flags |= CF_SIMPLE_TAG; | |
288 | if (scsi_populate_tag_msg(cmd, tag)) | |
289 | switch (tag[0]) { | |
290 | case MSG_HEAD_TAG: | |
291 | cmd_entry->control_flags |= CF_HEAD_TAG; | |
292 | break; | |
293 | case MSG_ORDERED_TAG: | |
294 | cmd_entry->control_flags |= CF_ORDERED_TAG; | |
295 | break; | |
296 | } | |
297 | ||
16ed55f9 | 298 | qla4xxx_advance_req_ring_ptr(ha); |
afaf5a2d DS |
299 | qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds); |
300 | wmb(); | |
301 | ||
afaf5a2d DS |
302 | srb->cmd->host_scribble = (unsigned char *)srb; |
303 | ||
304 | /* update counters */ | |
305 | srb->state = SRB_ACTIVE_STATE; | |
306 | srb->flags |= SRB_DMA_VALID; | |
307 | ||
308 | /* Track IOCB used */ | |
309 | ha->iocb_cnt += req_cnt; | |
310 | srb->iocb_cnt = req_cnt; | |
311 | ha->req_q_count -= req_cnt; | |
312 | ||
313 | /* Debug print statements */ | |
314 | writel(ha->request_in, &ha->reg->req_q_in); | |
315 | readl(&ha->reg->req_q_in); | |
316 | spin_unlock_irqrestore(&ha->hardware_lock, flags); | |
317 | ||
318 | return QLA_SUCCESS; | |
319 | ||
320 | queuing_error: | |
5f7186c8 FT |
321 | if (tot_dsds) |
322 | scsi_dma_unmap(cmd); | |
afaf5a2d | 323 | |
afaf5a2d DS |
324 | spin_unlock_irqrestore(&ha->hardware_lock, flags); |
325 | ||
326 | return QLA_ERROR; | |
327 | } | |
328 |