summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/bfa/bfa_sgpg.c
blob: 279d8f9b89073ddf82f2a33bfe6725db5d92d844 (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
/*
 * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
 * All rights reserved
 * www.brocade.com
 *
 * Linux driver for Brocade Fibre Channel Host Bus Adapter.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License (GPL) Version 2 as
 * published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <bfa.h>

BFA_TRC_FILE(HAL, SGPG);
BFA_MODULE(sgpg);

/**
 *  bfa_sgpg_mod BFA SGPG Mode module
 */

/**
 * Compute and return memory needed by FCP(im) module.
 */
static void
bfa_sgpg_meminfo(struct bfa_iocfc_cfg_s *cfg, u32 *km_len,
		u32 *dm_len)
{
	if (cfg->drvcfg.num_sgpgs < BFA_SGPG_MIN)
		cfg->drvcfg.num_sgpgs = BFA_SGPG_MIN;

	*km_len += (cfg->drvcfg.num_sgpgs + 1) * sizeof(struct bfa_sgpg_s);
	*dm_len += (cfg->drvcfg.num_sgpgs + 1) * sizeof(struct bfi_sgpg_s);
}


static void
bfa_sgpg_attach(struct bfa_s *bfa, void *bfad, struct bfa_iocfc_cfg_s *cfg,
		    struct bfa_meminfo_s *minfo, struct bfa_pcidev_s *pcidev)
{
	struct bfa_sgpg_mod_s	*mod = BFA_SGPG_MOD(bfa);
	int				i;
	struct bfa_sgpg_s		*hsgpg;
	struct bfi_sgpg_s 	*sgpg;
	u64		align_len;

	union {
		u64        pa;
		union bfi_addr_u      addr;
	} sgpg_pa;

	INIT_LIST_HEAD(&mod->sgpg_q);
	INIT_LIST_HEAD(&mod->sgpg_wait_q);

	bfa_trc(bfa, cfg->drvcfg.num_sgpgs);

	mod->num_sgpgs = cfg->drvcfg.num_sgpgs;
	mod->sgpg_arr_pa = bfa_meminfo_dma_phys(minfo);
	align_len = (BFA_SGPG_ROUNDUP(mod->sgpg_arr_pa) - mod->sgpg_arr_pa);
	mod->sgpg_arr_pa += align_len;
	mod->hsgpg_arr = (struct bfa_sgpg_s *) (bfa_meminfo_kva(minfo) +
						align_len);
	mod->sgpg_arr = (struct bfi_sgpg_s *) (bfa_meminfo_dma_virt(minfo) +
						align_len);

	hsgpg = mod->hsgpg_arr;
	sgpg = mod->sgpg_arr;
	sgpg_pa.pa = mod->sgpg_arr_pa;
	mod->free_sgpgs = mod->num_sgpgs;

	bfa_assert(!(sgpg_pa.pa & (sizeof(struct bfi_sgpg_s) - 1)));

	for (i = 0; i < mod->num_sgpgs; i++) {
		bfa_os_memset(hsgpg, 0, sizeof(*hsgpg));
		bfa_os_memset(sgpg, 0, sizeof(*sgpg));

		hsgpg->sgpg = sgpg;
		hsgpg->sgpg_pa = sgpg_pa.addr;
		list_add_tail(&hsgpg->qe, &mod->sgpg_q);

		hsgpg++;
		sgpg++;
		sgpg_pa.pa += sizeof(struct bfi_sgpg_s);
	}

	bfa_meminfo_kva(minfo) = (u8 *) hsgpg;
	bfa_meminfo_dma_virt(minfo) = (u8 *) sgpg;
	bfa_meminfo_dma_phys(minfo) = sgpg_pa.pa;
}

static void
bfa_sgpg_initdone(struct bfa_s *bfa)
{
}

static void
bfa_sgpg_detach(struct bfa_s *bfa)
{
}

static void
bfa_sgpg_start(struct bfa_s *bfa)
{
}

static void
bfa_sgpg_stop(struct bfa_s *bfa)
{
}

static void
bfa_sgpg_iocdisable(struct bfa_s *bfa)
{
}



/**
 *  bfa_sgpg_public BFA SGPG public functions
 */

bfa_status_t
bfa_sgpg_malloc(struct bfa_s *bfa, struct list_head *sgpg_q, int nsgpgs)
{
	struct bfa_sgpg_mod_s *mod = BFA_SGPG_MOD(bfa);
	struct bfa_sgpg_s *hsgpg;
	int             i;

	bfa_trc_fp(bfa, nsgpgs);

	if (mod->free_sgpgs < nsgpgs)
		return BFA_STATUS_ENOMEM;

	for (i = 0; i < nsgpgs; i++) {
		bfa_q_deq(&mod->sgpg_q, &hsgpg);
		bfa_assert(hsgpg);
		list_add_tail(&hsgpg->qe, sgpg_q);
	}

	mod->free_sgpgs -= nsgpgs;
	return BFA_STATUS_OK;
}

void
bfa_sgpg_mfree(struct bfa_s *bfa, struct list_head *sgpg_q, int nsgpg)
{
	struct bfa_sgpg_mod_s *mod = BFA_SGPG_MOD(bfa);
	struct bfa_sgpg_wqe_s *wqe;

	bfa_trc_fp(bfa, nsgpg);

	mod->free_sgpgs += nsgpg;
	bfa_assert(mod->free_sgpgs <= mod->num_sgpgs);

	list_splice_tail_init(sgpg_q, &mod->sgpg_q);

	if (list_empty(&mod->sgpg_wait_q))
		return;

	/**
	 * satisfy as many waiting requests as possible
	 */
	do {
		wqe = bfa_q_first(&mod->sgpg_wait_q);
		if (mod->free_sgpgs < wqe->nsgpg)
			nsgpg = mod->free_sgpgs;
		else
			nsgpg = wqe->nsgpg;
		bfa_sgpg_malloc(bfa, &wqe->sgpg_q, nsgpg);
		wqe->nsgpg -= nsgpg;
		if (wqe->nsgpg == 0) {
			list_del(&wqe->qe);
			wqe->cbfn(wqe->cbarg);
		}
	} while (mod->free_sgpgs && !list_empty(&mod->sgpg_wait_q));
}

void
bfa_sgpg_wait(struct bfa_s *bfa, struct bfa_sgpg_wqe_s *wqe, int nsgpg)
{
	struct bfa_sgpg_mod_s *mod = BFA_SGPG_MOD(bfa);

	bfa_assert(nsgpg > 0);
	bfa_assert(nsgpg > mod->free_sgpgs);

	wqe->nsgpg_total = wqe->nsgpg = nsgpg;

	/**
	 * allocate any left to this one first
	 */
	if (mod->free_sgpgs) {
		/**
		 * no one else is waiting for SGPG
		 */
		bfa_assert(list_empty(&mod->sgpg_wait_q));
		list_splice_tail_init(&mod->sgpg_q, &wqe->sgpg_q);
		wqe->nsgpg -= mod->free_sgpgs;
		mod->free_sgpgs = 0;
	}

	list_add_tail(&wqe->qe, &mod->sgpg_wait_q);
}

void
bfa_sgpg_wcancel(struct bfa_s *bfa, struct bfa_sgpg_wqe_s *wqe)
{
	struct bfa_sgpg_mod_s *mod = BFA_SGPG_MOD(bfa);

	bfa_assert(bfa_q_is_on_q(&mod->sgpg_wait_q, wqe));
	list_del(&wqe->qe);

	if (wqe->nsgpg_total != wqe->nsgpg)
		bfa_sgpg_mfree(bfa, &wqe->sgpg_q,
				   wqe->nsgpg_total - wqe->nsgpg);
}

void
bfa_sgpg_winit(struct bfa_sgpg_wqe_s *wqe, void (*cbfn) (void *cbarg),
		   void *cbarg)
{
	INIT_LIST_HEAD(&wqe->sgpg_q);
	wqe->cbfn = cbfn;
	wqe->cbarg = cbarg;
}