1 /**********************************************************************
4 * Contact: support@cavium.com
5 * Please include "LiquidIO" in the subject.
7 * Copyright (c) 2003-2015 Cavium, Inc.
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.
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
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"
45 static void oct_poll_req_completion(struct work_struct *work);
47 int octeon_setup_response_list(struct octeon_device *oct)
50 struct cavium_wq *cwq;
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);
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");
64 cwq = &oct->dma_comp_wq;
65 INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion);
67 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(100));
72 void octeon_delete_response_list(struct octeon_device *oct)
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);
79 int lio_process_ordered_list(struct octeon_device *octeon_dev,
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;
88 struct octeon_instr_rdp *rdp;
90 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST];
93 spin_lock_bh(&ordered_sc_list->lock);
95 if (ordered_sc_list->head.next == &ordered_sc_list->head) {
96 /* ordered_sc_list is empty; there is
100 (&ordered_sc_list->lock);
104 sc = (struct octeon_soft_command *)ordered_sc_list->
106 rdp = (struct octeon_instr_rdp *)&sc->cmd.rdp;
108 status = OCTEON_REQUEST_PENDING;
110 /* check if octeon has finished DMA'ing a response
111 * to where rptr is pointing to
113 dma_sync_single_for_cpu(&octeon_dev->pci_dev->dev,
114 sc->cmd.rptr, rdp->rlen,
116 status64 = *sc->status_word;
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 &
126 } else if (force_quit || (sc->timeout &&
127 time_after(jiffies, (unsigned long)sc->timeout))) {
128 status = OCTEON_REQUEST_TIMEOUT;
131 if (status != OCTEON_REQUEST_PENDING) {
132 /* we have received a response or we have timed out */
133 /* remove node from linked list */
135 atomic_dec(&octeon_dev->response_list
136 [OCTEON_ORDERED_SC_LIST].
139 (&ordered_sc_list->lock);
142 sc->callback(octeon_dev, status,
148 /* no response yet */
149 request_complete = 0;
151 (&ordered_sc_list->lock);
154 /* If we hit the Max Ordered requests to process every loop,
156 * and let this function be invoked the next time the poll
158 * to process the remaining requests. This function can take up
159 * the entire CPU if there is no upper limit to the requests
162 if (request_complete >= resp_to_process)
164 } while (request_complete);
169 static void oct_poll_req_completion(struct work_struct *work)
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;
175 lio_process_ordered_list(oct, 0);
177 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(100));