1 /**********************************************************************
2 * Author: Cavium, Inc.
3 *
4 * Contact: support@cavium.com
5 * Please include "LiquidIO" in the subject.
6 *
7 * Copyright (c) 2003-2015 Cavium, Inc.
8 *
9 * This file is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License, Version 2, as
11 * published by the Free Software Foundation.
12 *
13 * This file is distributed in the hope that it will be useful, but
14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
16 * NONINFRINGEMENT. See the GNU General Public License for more
17 * details.
18 *
19 * This file may also be available under a different license from Cavium.
20 * Contact Cavium, Inc. for more information
21 **********************************************************************/
22 #include <linux/version.h>
23 #include <linux/types.h>
24 #include <linux/list.h>
25 #include <linux/interrupt.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/pci.h>
28 #include <linux/kthread.h>
29 #include <linux/netdevice.h>
30 #include "octeon_config.h"
31 #include "liquidio_common.h"
32 #include "octeon_droq.h"
33 #include "octeon_iq.h"
34 #include "response_manager.h"
35 #include "octeon_device.h"
36 #include "octeon_nic.h"
37 #include "octeon_main.h"
38 #include "octeon_network.h"
39 #include "cn66xx_regs.h"
40 #include "cn66xx_device.h"
41 #include "cn68xx_regs.h"
42 #include "cn68xx_device.h"
43 #include "liquidio_image.h"
44
45 static void oct_poll_req_completion(struct work_struct *work);
46
octeon_setup_response_list(struct octeon_device * oct)47 int octeon_setup_response_list(struct octeon_device *oct)
48 {
49 int i, ret = 0;
50 struct cavium_wq *cwq;
51
52 for (i = 0; i < MAX_RESPONSE_LISTS; i++) {
53 INIT_LIST_HEAD(&oct->response_list[i].head);
54 spin_lock_init(&oct->response_list[i].lock);
55 atomic_set(&oct->response_list[i].pending_req_count, 0);
56 }
57
58 oct->dma_comp_wq.wq = create_workqueue("dma-comp");
59 if (!oct->dma_comp_wq.wq) {
60 dev_err(&oct->pci_dev->dev, "failed to create wq thread\n");
61 return -ENOMEM;
62 }
63
64 cwq = &oct->dma_comp_wq;
65 INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion);
66 cwq->wk.ctxptr = oct;
67 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(100));
68
69 return ret;
70 }
71
octeon_delete_response_list(struct octeon_device * oct)72 void octeon_delete_response_list(struct octeon_device *oct)
73 {
74 cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work);
75 flush_workqueue(oct->dma_comp_wq.wq);
76 destroy_workqueue(oct->dma_comp_wq.wq);
77 }
78
lio_process_ordered_list(struct octeon_device * octeon_dev,u32 force_quit)79 int lio_process_ordered_list(struct octeon_device *octeon_dev,
80 u32 force_quit)
81 {
82 struct octeon_response_list *ordered_sc_list;
83 struct octeon_soft_command *sc;
84 int request_complete = 0;
85 int resp_to_process = MAX_ORD_REQS_TO_PROCESS;
86 u32 status;
87 u64 status64;
88 struct octeon_instr_rdp *rdp;
89
90 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST];
91
92 do {
93 spin_lock_bh(&ordered_sc_list->lock);
94
95 if (ordered_sc_list->head.next == &ordered_sc_list->head) {
96 /* ordered_sc_list is empty; there is
97 * nothing to process
98 */
99 spin_unlock_bh
100 (&ordered_sc_list->lock);
101 return 1;
102 }
103
104 sc = (struct octeon_soft_command *)ordered_sc_list->
105 head.next;
106 rdp = (struct octeon_instr_rdp *)&sc->cmd.rdp;
107
108 status = OCTEON_REQUEST_PENDING;
109
110 /* check if octeon has finished DMA'ing a response
111 * to where rptr is pointing to
112 */
113 dma_sync_single_for_cpu(&octeon_dev->pci_dev->dev,
114 sc->cmd.rptr, rdp->rlen,
115 DMA_FROM_DEVICE);
116 status64 = *sc->status_word;
117
118 if (status64 != COMPLETION_WORD_INIT) {
119 if ((status64 & 0xff) != 0xff) {
120 octeon_swap_8B_data(&status64, 1);
121 if (((status64 & 0xff) != 0xff)) {
122 status = (u32)(status64 &
123 0xffffffffULL);
124 }
125 }
126 } else if (force_quit || (sc->timeout &&
127 time_after(jiffies, (unsigned long)sc->timeout))) {
128 status = OCTEON_REQUEST_TIMEOUT;
129 }
130
131 if (status != OCTEON_REQUEST_PENDING) {
132 /* we have received a response or we have timed out */
133 /* remove node from linked list */
134 list_del(&sc->node);
135 atomic_dec(&octeon_dev->response_list
136 [OCTEON_ORDERED_SC_LIST].
137 pending_req_count);
138 spin_unlock_bh
139 (&ordered_sc_list->lock);
140
141 if (sc->callback)
142 sc->callback(octeon_dev, status,
143 sc->callback_arg);
144
145 request_complete++;
146
147 } else {
148 /* no response yet */
149 request_complete = 0;
150 spin_unlock_bh
151 (&ordered_sc_list->lock);
152 }
153
154 /* If we hit the Max Ordered requests to process every loop,
155 * we quit
156 * and let this function be invoked the next time the poll
157 * thread runs
158 * to process the remaining requests. This function can take up
159 * the entire CPU if there is no upper limit to the requests
160 * processed.
161 */
162 if (request_complete >= resp_to_process)
163 break;
164 } while (request_complete);
165
166 return 0;
167 }
168
oct_poll_req_completion(struct work_struct * work)169 static void oct_poll_req_completion(struct work_struct *work)
170 {
171 struct cavium_wk *wk = (struct cavium_wk *)work;
172 struct octeon_device *oct = (struct octeon_device *)wk->ctxptr;
173 struct cavium_wq *cwq = &oct->dma_comp_wq;
174
175 lio_process_ordered_list(oct, 0);
176
177 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(100));
178 }
179