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
|
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (C) 2017 Intel Deutschland GmbH
* Copyright (C) 2018-2020 Intel Corporation
*/
#include <net/tso.h>
#include <linux/tcp.h>
#include "iwl-debug.h"
#include "iwl-csr.h"
#include "iwl-io.h"
#include "internal.h"
#include "fw/api/tx.h"
#include "queue/tx.h"
/*************** HOST COMMAND QUEUE FUNCTIONS *****/
/*
* iwl_pcie_gen2_enqueue_hcmd - enqueue a uCode command
* @priv: device private data point
* @cmd: a pointer to the ucode command structure
*
* The function returns < 0 values to indicate the operation
* failed. On success, it returns the index (>= 0) of command in the
* command queue.
*/
int iwl_pcie_gen2_enqueue_hcmd(struct iwl_trans *trans,
struct iwl_host_cmd *cmd)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
struct iwl_txq *txq = trans->txqs.txq[trans->txqs.cmd.q_id];
struct iwl_device_cmd *out_cmd;
struct iwl_cmd_meta *out_meta;
void *dup_buf = NULL;
dma_addr_t phys_addr;
int i, cmd_pos, idx;
u16 copy_size, cmd_size, tb0_size;
bool had_nocopy = false;
u8 group_id = iwl_cmd_groupid(cmd->id);
const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
struct iwl_tfh_tfd *tfd;
copy_size = sizeof(struct iwl_cmd_header_wide);
cmd_size = sizeof(struct iwl_cmd_header_wide);
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
cmddata[i] = cmd->data[i];
cmdlen[i] = cmd->len[i];
if (!cmd->len[i])
continue;
/* need at least IWL_FIRST_TB_SIZE copied */
if (copy_size < IWL_FIRST_TB_SIZE) {
int copy = IWL_FIRST_TB_SIZE - copy_size;
if (copy > cmdlen[i])
copy = cmdlen[i];
cmdlen[i] -= copy;
cmddata[i] += copy;
copy_size += copy;
}
if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
had_nocopy = true;
if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
idx = -EINVAL;
goto free_dup_buf;
}
} else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
/*
* This is also a chunk that isn't copied
* to the static buffer so set had_nocopy.
*/
had_nocopy = true;
/* only allowed once */
if (WARN_ON(dup_buf)) {
idx = -EINVAL;
goto free_dup_buf;
}
dup_buf = kmemdup(cmddata[i], cmdlen[i],
GFP_ATOMIC);
if (!dup_buf)
return -ENOMEM;
} else {
/* NOCOPY must not be followed by normal! */
if (WARN_ON(had_nocopy)) {
idx = -EINVAL;
goto free_dup_buf;
}
copy_size += cmdlen[i];
}
cmd_size += cmd->len[i];
}
/*
* If any of the command structures end up being larger than the
* TFD_MAX_PAYLOAD_SIZE and they aren't dynamically allocated into
* separate TFDs, then we will need to increase the size of the buffers
*/
if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
"Command %s (%#x) is too large (%d bytes)\n",
iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size)) {
idx = -EINVAL;
goto free_dup_buf;
}
spin_lock_bh(&txq->lock);
idx = iwl_txq_get_cmd_index(txq, txq->write_ptr);
tfd = iwl_txq_get_tfd(trans, txq, txq->write_ptr);
memset(tfd, 0, sizeof(*tfd));
if (iwl_txq_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
spin_unlock_bh(&txq->lock);
IWL_ERR(trans, "No space in command queue\n");
iwl_op_mode_cmd_queue_full(trans->op_mode);
idx = -ENOSPC;
goto free_dup_buf;
}
out_cmd = txq->entries[idx].cmd;
out_meta = &txq->entries[idx].meta;
/* re-initialize to NULL */
memset(out_meta, 0, sizeof(*out_meta));
if (cmd->flags & CMD_WANT_SKB)
out_meta->source = cmd;
/* set up the header */
out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
out_cmd->hdr_wide.group_id = group_id;
out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
out_cmd->hdr_wide.length =
cpu_to_le16(cmd_size - sizeof(struct iwl_cmd_header_wide));
out_cmd->hdr_wide.reserved = 0;
out_cmd->hdr_wide.sequence =
cpu_to_le16(QUEUE_TO_SEQ(trans->txqs.cmd.q_id) |
INDEX_TO_SEQ(txq->write_ptr));
cmd_pos = sizeof(struct iwl_cmd_header_wide);
copy_size = sizeof(struct iwl_cmd_header_wide);
/* and copy the data that needs to be copied */
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
int copy;
if (!cmd->len[i])
continue;
/* copy everything if not nocopy/dup */
if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
IWL_HCMD_DFL_DUP))) {
copy = cmd->len[i];
memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
cmd_pos += copy;
copy_size += copy;
continue;
}
/*
* Otherwise we need at least IWL_FIRST_TB_SIZE copied
* in total (for bi-directional DMA), but copy up to what
* we can fit into the payload for debug dump purposes.
*/
copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
cmd_pos += copy;
/* However, treat copy_size the proper way, we need it below */
if (copy_size < IWL_FIRST_TB_SIZE) {
copy = IWL_FIRST_TB_SIZE - copy_size;
if (copy > cmd->len[i])
copy = cmd->len[i];
copy_size += copy;
}
}
IWL_DEBUG_HC(trans,
"Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
iwl_get_cmd_string(trans, cmd->id), group_id,
out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
cmd_size, txq->write_ptr, idx, trans->txqs.cmd.q_id);
/* start the TFD with the minimum copy bytes */
tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
memcpy(&txq->first_tb_bufs[idx], out_cmd, tb0_size);
iwl_txq_gen2_set_tb(trans, tfd, iwl_txq_get_first_tb_dma(txq, idx),
tb0_size);
/* map first command fragment, if any remains */
if (copy_size > tb0_size) {
phys_addr = dma_map_single(trans->dev,
(u8 *)out_cmd + tb0_size,
copy_size - tb0_size,
DMA_TO_DEVICE);
if (dma_mapping_error(trans->dev, phys_addr)) {
idx = -ENOMEM;
iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
goto out;
}
iwl_txq_gen2_set_tb(trans, tfd, phys_addr,
copy_size - tb0_size);
}
/* map the remaining (adjusted) nocopy/dup fragments */
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
const void *data = cmddata[i];
if (!cmdlen[i])
continue;
if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
IWL_HCMD_DFL_DUP)))
continue;
if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
data = dup_buf;
phys_addr = dma_map_single(trans->dev, (void *)data,
cmdlen[i], DMA_TO_DEVICE);
if (dma_mapping_error(trans->dev, phys_addr)) {
idx = -ENOMEM;
iwl_txq_gen2_tfd_unmap(trans, out_meta, tfd);
goto out;
}
iwl_txq_gen2_set_tb(trans, tfd, phys_addr, cmdlen[i]);
}
BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE);
out_meta->flags = cmd->flags;
if (WARN_ON_ONCE(txq->entries[idx].free_buf))
kfree_sensitive(txq->entries[idx].free_buf);
txq->entries[idx].free_buf = dup_buf;
trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
/* start timer if queue currently empty */
if (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
spin_lock(&trans_pcie->reg_lock);
/* Increment and update queue's write index */
txq->write_ptr = iwl_txq_inc_wrap(trans, txq->write_ptr);
iwl_txq_inc_wr_ptr(trans, txq);
spin_unlock(&trans_pcie->reg_lock);
out:
spin_unlock_bh(&txq->lock);
free_dup_buf:
if (idx < 0)
kfree(dup_buf);
return idx;
}
|
