summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/qla4xxx/ql4_iocb.c
blob: e0c32159749c5b61aa5d57abe1050212d0e6fc40 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
/*
 * QLogic iSCSI HBA Driver
 * Copyright (c)  2003-2006 QLogic Corporation
 *
 * See LICENSE.qla4xxx for copyright and licensing details.
 */

#include "ql4_def.h"
#include "ql4_glbl.h"
#include "ql4_dbg.h"
#include "ql4_inline.h"

#include <scsi/scsi_tcq.h>

static int
qla4xxx_space_in_req_ring(struct scsi_qla_host *ha, uint16_t req_cnt)
{
	uint16_t cnt;

	/* Calculate number of free request entries. */
	if ((req_cnt + 2) >= ha->req_q_count) {
		cnt = (uint16_t) le32_to_cpu(ha->shadow_regs->req_q_out);
		if (ha->request_in < cnt)
			ha->req_q_count = cnt - ha->request_in;
		else
			ha->req_q_count = REQUEST_QUEUE_DEPTH -
						(ha->request_in - cnt);
	}

	/* Check if room for request in request ring. */
	if ((req_cnt + 2) < ha->req_q_count)
		return 1;
	else
		return 0;
}

static void qla4xxx_advance_req_ring_ptr(struct scsi_qla_host *ha)
{
	/* Advance request queue pointer */
	if (ha->request_in == (REQUEST_QUEUE_DEPTH - 1)) {
		ha->request_in = 0;
		ha->request_ptr = ha->request_ring;
	} else {
		ha->request_in++;
		ha->request_ptr++;
	}
}

/**
 * qla4xxx_get_req_pkt - returns a valid entry in request queue.
 * @ha: Pointer to host adapter structure.
 * @queue_entry: Pointer to pointer to queue entry structure
 *
 * This routine performs the following tasks:
 *	- returns the current request_in pointer (if queue not full)
 *	- advances the request_in pointer
 *	- checks for queue full
 **/
static int qla4xxx_get_req_pkt(struct scsi_qla_host *ha,
			       struct queue_entry **queue_entry)
{
	uint16_t req_cnt = 1;

	if (qla4xxx_space_in_req_ring(ha, req_cnt)) {
		*queue_entry = ha->request_ptr;
		memset(*queue_entry, 0, sizeof(**queue_entry));

		qla4xxx_advance_req_ring_ptr(ha);
		ha->req_q_count -= req_cnt;
		return QLA_SUCCESS;
	}

	return QLA_ERROR;
}

/**
 * qla4xxx_send_marker_iocb - issues marker iocb to HBA
 * @ha: Pointer to host adapter structure.
 * @ddb_entry: Pointer to device database entry
 * @lun: SCSI LUN
 * @marker_type: marker identifier
 *
 * This routine issues a marker IOCB.
 **/
int qla4xxx_send_marker_iocb(struct scsi_qla_host *ha,
	struct ddb_entry *ddb_entry, int lun, uint16_t mrkr_mod)
{
	struct qla4_marker_entry *marker_entry;
	unsigned long flags = 0;
	uint8_t status = QLA_SUCCESS;

	/* Acquire hardware specific lock */
	spin_lock_irqsave(&ha->hardware_lock, flags);

	/* Get pointer to the queue entry for the marker */
	if (qla4xxx_get_req_pkt(ha, (struct queue_entry **) &marker_entry) !=
	    QLA_SUCCESS) {
		status = QLA_ERROR;
		goto exit_send_marker;
	}

	/* Put the marker in the request queue */
	marker_entry->hdr.entryType = ET_MARKER;
	marker_entry->hdr.entryCount = 1;
	marker_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
	marker_entry->modifier = cpu_to_le16(mrkr_mod);
	int_to_scsilun(lun, &marker_entry->lun);
	wmb();

	/* Tell ISP it's got a new I/O request */
	writel(ha->request_in, &ha->reg->req_q_in);
	readl(&ha->reg->req_q_in);

exit_send_marker:
	spin_unlock_irqrestore(&ha->hardware_lock, flags);
	return status;
}

static struct continuation_t1_entry *
qla4xxx_alloc_cont_entry(struct scsi_qla_host *ha)
{
	struct continuation_t1_entry *cont_entry;

	cont_entry = (struct continuation_t1_entry *)ha->request_ptr;

	qla4xxx_advance_req_ring_ptr(ha);

	/* Load packet defaults */
	cont_entry->hdr.entryType = ET_CONTINUE;
	cont_entry->hdr.entryCount = 1;
	cont_entry->hdr.systemDefined = (uint8_t) cpu_to_le16(ha->request_in);

	return cont_entry;
}

static uint16_t qla4xxx_calc_request_entries(uint16_t dsds)
{
	uint16_t iocbs;

	iocbs = 1;
	if (dsds > COMMAND_SEG) {
		iocbs += (dsds - COMMAND_SEG) / CONTINUE_SEG;
		if ((dsds - COMMAND_SEG) % CONTINUE_SEG)
			iocbs++;
	}
	return iocbs;
}

static void qla4xxx_build_scsi_iocbs(struct srb *srb,
				     struct command_t3_entry *cmd_entry,
				     uint16_t tot_dsds)
{
	struct scsi_qla_host *ha;
	uint16_t avail_dsds;
	struct data_seg_a64 *cur_dsd;
	struct scsi_cmnd *cmd;
	struct scatterlist *sg;
	int i;

	cmd = srb->cmd;
	ha = srb->ha;

	if (!scsi_bufflen(cmd) || cmd->sc_data_direction == DMA_NONE) {
		/* No data being transferred */
		cmd_entry->ttlByteCnt = __constant_cpu_to_le32(0);
		return;
	}

	avail_dsds = COMMAND_SEG;
	cur_dsd = (struct data_seg_a64 *) & (cmd_entry->dataseg[0]);

	scsi_for_each_sg(cmd, sg, tot_dsds, i) {
		dma_addr_t sle_dma;

		/* Allocate additional continuation packets? */
		if (avail_dsds == 0) {
			struct continuation_t1_entry *cont_entry;

			cont_entry = qla4xxx_alloc_cont_entry(ha);
			cur_dsd =
				(struct data_seg_a64 *)
				&cont_entry->dataseg[0];
			avail_dsds = CONTINUE_SEG;
		}

		sle_dma = sg_dma_address(sg);
		cur_dsd->base.addrLow = cpu_to_le32(LSDW(sle_dma));
		cur_dsd->base.addrHigh = cpu_to_le32(MSDW(sle_dma));
		cur_dsd->count = cpu_to_le32(sg_dma_len(sg));
		avail_dsds--;

		cur_dsd++;
	}
}

/**
 * qla4xxx_send_command_to_isp - issues command to HBA
 * @ha: pointer to host adapter structure.
 * @srb: pointer to SCSI Request Block to be sent to ISP
 *
 * This routine is called by qla4xxx_queuecommand to build an ISP
 * command and pass it to the ISP for execution.
 **/
int qla4xxx_send_command_to_isp(struct scsi_qla_host *ha, struct srb * srb)
{
	struct scsi_cmnd *cmd = srb->cmd;
	struct ddb_entry *ddb_entry;
	struct command_t3_entry *cmd_entry;
	int nseg;
	uint16_t tot_dsds;
	uint16_t req_cnt;
	unsigned long flags;
	uint32_t index;
	char tag[2];

	/* Get real lun and adapter */
	ddb_entry = srb->ddb;

	tot_dsds = 0;

	/* Acquire hardware specific lock */
	spin_lock_irqsave(&ha->hardware_lock, flags);

	index = (uint32_t)cmd->request->tag;

	/*
	 * Check to see if adapter is online before placing request on
	 * request queue.  If a reset occurs and a request is in the queue,
	 * the firmware will still attempt to process the request, retrieving
	 * garbage for pointers.
	 */
	if (!test_bit(AF_ONLINE, &ha->flags)) {
		DEBUG2(printk("scsi%ld: %s: Adapter OFFLINE! "
			      "Do not issue command.\n",
			      ha->host_no, __func__));
		goto queuing_error;
	}

	/* Calculate the number of request entries needed. */
	nseg = scsi_dma_map(cmd);
	if (nseg < 0)
		goto queuing_error;
	tot_dsds = nseg;

	req_cnt = qla4xxx_calc_request_entries(tot_dsds);
	if (!qla4xxx_space_in_req_ring(ha, req_cnt))
		goto queuing_error;

	/* total iocbs active */
	if ((ha->iocb_cnt + req_cnt) >= REQUEST_QUEUE_DEPTH)
		goto queuing_error;

	/* Build command packet */
	cmd_entry = (struct command_t3_entry *) ha->request_ptr;
	memset(cmd_entry, 0, sizeof(struct command_t3_entry));
	cmd_entry->hdr.entryType = ET_COMMAND;
	cmd_entry->handle = cpu_to_le32(index);
	cmd_entry->target = cpu_to_le16(ddb_entry->fw_ddb_index);
	cmd_entry->connection_id = cpu_to_le16(ddb_entry->connection_id);

	int_to_scsilun(cmd->device->lun, &cmd_entry->lun);
	cmd_entry->cmdSeqNum = cpu_to_le32(ddb_entry->CmdSn);
	cmd_entry->ttlByteCnt = cpu_to_le32(scsi_bufflen(cmd));
	memcpy(cmd_entry->cdb, cmd->cmnd, cmd->cmd_len);
	cmd_entry->dataSegCnt = cpu_to_le16(tot_dsds);
	cmd_entry->hdr.entryCount = req_cnt;

	/* Set data transfer direction control flags
	 * NOTE: Look at data_direction bits iff there is data to be
	 *	 transferred, as the data direction bit is sometimed filled
	 *	 in when there is no data to be transferred */
	cmd_entry->control_flags = CF_NO_DATA;
	if (scsi_bufflen(cmd)) {
		if (cmd->sc_data_direction == DMA_TO_DEVICE)
			cmd_entry->control_flags = CF_WRITE;
		else if (cmd->sc_data_direction == DMA_FROM_DEVICE)
			cmd_entry->control_flags = CF_READ;

		ha->bytes_xfered += scsi_bufflen(cmd);
		if (ha->bytes_xfered & ~0xFFFFF){
			ha->total_mbytes_xferred += ha->bytes_xfered >> 20;
			ha->bytes_xfered &= 0xFFFFF;
		}
	}

	/* Set tagged queueing control flags */
	cmd_entry->control_flags |= CF_SIMPLE_TAG;
	if (scsi_populate_tag_msg(cmd, tag))
		switch (tag[0]) {
		case MSG_HEAD_TAG:
			cmd_entry->control_flags |= CF_HEAD_TAG;
			break;
		case MSG_ORDERED_TAG:
			cmd_entry->control_flags |= CF_ORDERED_TAG;
			break;
		}

	qla4xxx_advance_req_ring_ptr(ha);
	qla4xxx_build_scsi_iocbs(srb, cmd_entry, tot_dsds);
	wmb();

	srb->cmd->host_scribble = (unsigned char *)srb;

	/* update counters */
	srb->state = SRB_ACTIVE_STATE;
	srb->flags |= SRB_DMA_VALID;

	/* Track IOCB used */
	ha->iocb_cnt += req_cnt;
	srb->iocb_cnt = req_cnt;
	ha->req_q_count -= req_cnt;

	/* Debug print statements */
	writel(ha->request_in, &ha->reg->req_q_in);
	readl(&ha->reg->req_q_in);
	spin_unlock_irqrestore(&ha->hardware_lock, flags);

	return QLA_SUCCESS;

queuing_error:
	if (tot_dsds)
		scsi_dma_unmap(cmd);

	spin_unlock_irqrestore(&ha->hardware_lock, flags);

	return QLA_ERROR;
}

OpenPOWER on IntegriCloud