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/pci.h>
23 #include <linux/netdevice.h>
24 #include "liquidio_common.h"
25 #include "octeon_droq.h"
26 #include "octeon_iq.h"
27 #include "response_manager.h"
28 #include "octeon_device.h"
29 #include "octeon_main.h"
31 static void oct_poll_req_completion(struct work_struct *work);
33 int octeon_setup_response_list(struct octeon_device *oct)
36 struct cavium_wq *cwq;
38 for (i = 0; i < MAX_RESPONSE_LISTS; i++) {
39 INIT_LIST_HEAD(&oct->response_list[i].head);
40 spin_lock_init(&oct->response_list[i].lock);
41 atomic_set(&oct->response_list[i].pending_req_count, 0);
43 spin_lock_init(&oct->cmd_resp_wqlock);
45 oct->dma_comp_wq.wq = alloc_workqueue("dma-comp", WQ_MEM_RECLAIM, 0);
46 if (!oct->dma_comp_wq.wq) {
47 dev_err(&oct->pci_dev->dev, "failed to create wq thread\n");
51 cwq = &oct->dma_comp_wq;
52 INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion);
54 oct->cmd_resp_state = OCT_DRV_ONLINE;
55 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(50));
60 void octeon_delete_response_list(struct octeon_device *oct)
62 cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work);
63 destroy_workqueue(oct->dma_comp_wq.wq);
66 int lio_process_ordered_list(struct octeon_device *octeon_dev,
69 struct octeon_response_list *ordered_sc_list;
70 struct octeon_soft_command *sc;
71 int request_complete = 0;
72 int resp_to_process = MAX_ORD_REQS_TO_PROCESS;
75 struct octeon_instr_rdp *rdp;
78 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST];
81 spin_lock_bh(&ordered_sc_list->lock);
83 if (ordered_sc_list->head.next == &ordered_sc_list->head) {
84 /* ordered_sc_list is empty; there is
88 (&ordered_sc_list->lock);
92 sc = (struct octeon_soft_command *)ordered_sc_list->
94 if (OCTEON_CN23XX_PF(octeon_dev)) {
95 rdp = (struct octeon_instr_rdp *)&sc->cmd.cmd3.rdp;
96 rptr = sc->cmd.cmd3.rptr;
98 rdp = (struct octeon_instr_rdp *)&sc->cmd.cmd2.rdp;
99 rptr = sc->cmd.cmd2.rptr;
102 status = OCTEON_REQUEST_PENDING;
104 /* check if octeon has finished DMA'ing a response
105 * to where rptr is pointing to
107 dma_sync_single_for_cpu(&octeon_dev->pci_dev->dev,
110 status64 = *sc->status_word;
112 if (status64 != COMPLETION_WORD_INIT) {
113 if ((status64 & 0xff) != 0xff) {
114 octeon_swap_8B_data(&status64, 1);
115 if (((status64 & 0xff) != 0xff)) {
116 status = (u32)(status64 &
120 } else if (force_quit || (sc->timeout &&
121 time_after(jiffies, (unsigned long)sc->timeout))) {
122 status = OCTEON_REQUEST_TIMEOUT;
125 if (status != OCTEON_REQUEST_PENDING) {
126 /* we have received a response or we have timed out */
127 /* remove node from linked list */
129 atomic_dec(&octeon_dev->response_list
130 [OCTEON_ORDERED_SC_LIST].
133 (&ordered_sc_list->lock);
136 sc->callback(octeon_dev, status,
142 /* no response yet */
143 request_complete = 0;
145 (&ordered_sc_list->lock);
148 /* If we hit the Max Ordered requests to process every loop,
150 * and let this function be invoked the next time the poll
152 * to process the remaining requests. This function can take up
153 * the entire CPU if there is no upper limit to the requests
156 if (request_complete >= resp_to_process)
158 } while (request_complete);
163 static void oct_poll_req_completion(struct work_struct *work)
165 struct cavium_wk *wk = (struct cavium_wk *)work;
166 struct octeon_device *oct = (struct octeon_device *)wk->ctxptr;
167 struct cavium_wq *cwq = &oct->dma_comp_wq;
169 lio_process_ordered_list(oct, 0);
170 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(50));