1 /**********************************************************************
4 * Contact: support@cavium.com
5 * Please include "LiquidIO" in the subject.
7 * Copyright (c) 2003-2016 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
18 **********************************************************************/
19 #include <linux/pci.h>
20 #include <linux/netdevice.h>
21 #include "liquidio_common.h"
22 #include "octeon_droq.h"
23 #include "octeon_iq.h"
24 #include "response_manager.h"
25 #include "octeon_device.h"
26 #include "octeon_main.h"
28 static void oct_poll_req_completion(struct work_struct *work);
30 int octeon_setup_response_list(struct octeon_device *oct)
33 struct cavium_wq *cwq;
35 for (i = 0; i < MAX_RESPONSE_LISTS; i++) {
36 INIT_LIST_HEAD(&oct->response_list[i].head);
37 spin_lock_init(&oct->response_list[i].lock);
38 atomic_set(&oct->response_list[i].pending_req_count, 0);
40 spin_lock_init(&oct->cmd_resp_wqlock);
42 oct->dma_comp_wq.wq = alloc_workqueue("dma-comp", WQ_MEM_RECLAIM, 0);
43 if (!oct->dma_comp_wq.wq) {
44 dev_err(&oct->pci_dev->dev, "failed to create wq thread\n");
48 cwq = &oct->dma_comp_wq;
49 INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion);
51 oct->cmd_resp_state = OCT_DRV_ONLINE;
55 EXPORT_SYMBOL_GPL(octeon_setup_response_list);
57 void octeon_delete_response_list(struct octeon_device *oct)
59 cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work);
60 destroy_workqueue(oct->dma_comp_wq.wq);
62 EXPORT_SYMBOL_GPL(octeon_delete_response_list);
64 int lio_process_ordered_list(struct octeon_device *octeon_dev,
67 struct octeon_response_list *ordered_sc_list;
68 struct octeon_soft_command *sc;
69 int request_complete = 0;
70 int resp_to_process = MAX_ORD_REQS_TO_PROCESS;
74 octeon_free_sc_done_list(octeon_dev);
76 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST];
79 spin_lock_bh(&ordered_sc_list->lock);
81 if (list_empty(&ordered_sc_list->head)) {
82 spin_unlock_bh(&ordered_sc_list->lock);
86 sc = list_first_entry(&ordered_sc_list->head,
87 struct octeon_soft_command, node);
89 status = OCTEON_REQUEST_PENDING;
91 /* check if octeon has finished DMA'ing a response
92 * to where rptr is pointing to
94 status64 = *sc->status_word;
96 if (status64 != COMPLETION_WORD_INIT) {
97 /* This logic ensures that all 64b have been written.
98 * 1. check byte 0 for non-FF
99 * 2. if non-FF, then swap result from BE to host order
100 * 3. check byte 7 (swapped to 0) for non-FF
101 * 4. if non-FF, use the low 32-bit status code
102 * 5. if either byte 0 or byte 7 is FF, don't use status
104 if ((status64 & 0xff) != 0xff) {
105 octeon_swap_8B_data(&status64, 1);
106 if (((status64 & 0xff) != 0xff)) {
107 /* retrieve 16-bit firmware status */
108 status = (u32)(status64 & 0xffffULL);
111 FIRMWARE_STATUS_CODE(status);
114 status = OCTEON_REQUEST_DONE;
118 } else if (unlikely(force_quit) || (sc->expiry_time &&
119 time_after(jiffies, (unsigned long)sc->expiry_time))) {
120 struct octeon_instr_irh *irh =
121 (struct octeon_instr_irh *)&sc->cmd.cmd3.irh;
123 dev_err(&octeon_dev->pci_dev->dev, "%s: ", __func__);
124 dev_err(&octeon_dev->pci_dev->dev,
125 "cmd %x/%x/%llx/%llx failed, ",
126 irh->opcode, irh->subcode,
127 sc->cmd.cmd3.ossp[0], sc->cmd.cmd3.ossp[1]);
128 dev_err(&octeon_dev->pci_dev->dev,
129 "timeout (%ld, %ld)\n",
130 (long)jiffies, (long)sc->expiry_time);
131 status = OCTEON_REQUEST_TIMEOUT;
134 if (status != OCTEON_REQUEST_PENDING) {
135 sc->sc_status = status;
137 /* we have received a response or we have timed out */
138 /* remove node from linked list */
140 atomic_dec(&octeon_dev->response_list
141 [OCTEON_ORDERED_SC_LIST].
145 atomic_inc(&octeon_dev->response_list
146 [OCTEON_DONE_SC_LIST].
148 list_add_tail(&sc->node,
149 &octeon_dev->response_list
150 [OCTEON_DONE_SC_LIST].head);
152 if (unlikely(READ_ONCE(sc->caller_is_done))) {
153 /* caller does not wait for response
156 if (status != OCTEON_REQUEST_DONE) {
157 struct octeon_instr_irh *irh;
160 (struct octeon_instr_irh *)
163 (&octeon_dev->pci_dev->dev,
164 "%s: sc failed: opcode=%x, ",
165 __func__, irh->opcode);
167 (&octeon_dev->pci_dev->dev,
168 "subcode=%x, ossp[0]=%llx, ",
170 sc->cmd.cmd3.ossp[0]);
172 (&octeon_dev->pci_dev->dev,
173 "ossp[1]=%llx, status=%d\n",
174 sc->cmd.cmd3.ossp[1],
178 complete(&sc->complete);
181 spin_unlock_bh(&ordered_sc_list->lock);
183 /* sc with callback function */
184 if (status == OCTEON_REQUEST_TIMEOUT) {
185 atomic_inc(&octeon_dev->response_list
186 [OCTEON_ZOMBIE_SC_LIST].
188 list_add_tail(&sc->node,
189 &octeon_dev->response_list
190 [OCTEON_ZOMBIE_SC_LIST].
194 spin_unlock_bh(&ordered_sc_list->lock);
196 sc->callback(octeon_dev, status,
198 /* sc is freed by caller */
204 /* no response yet */
205 request_complete = 0;
207 (&ordered_sc_list->lock);
210 /* If we hit the Max Ordered requests to process every loop,
212 * and let this function be invoked the next time the poll
214 * to process the remaining requests. This function can take up
215 * the entire CPU if there is no upper limit to the requests
218 if (request_complete >= resp_to_process)
220 } while (request_complete);
224 EXPORT_SYMBOL_GPL(lio_process_ordered_list);
226 static void oct_poll_req_completion(struct work_struct *work)
228 struct cavium_wk *wk = (struct cavium_wk *)work;
229 struct octeon_device *oct = (struct octeon_device *)wk->ctxptr;
230 struct cavium_wq *cwq = &oct->dma_comp_wq;
232 lio_process_ordered_list(oct, 0);
234 if (atomic_read(&oct->response_list
235 [OCTEON_ORDERED_SC_LIST].pending_req_count))
236 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(1));