1 /********************************************************************** 2 * Author: Cavium, Inc. 3 * 4 * Contact: support@cavium.com 5 * Please include "LiquidIO" in the subject. 6 * 7 * Copyright (c) 2003-2016 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 #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" 27 28 static void oct_poll_req_completion(struct work_struct *work); 29 30 int octeon_setup_response_list(struct octeon_device *oct) 31 { 32 int i, ret = 0; 33 struct cavium_wq *cwq; 34 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); 39 } 40 spin_lock_init(&oct->cmd_resp_wqlock); 41 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"); 45 return -ENOMEM; 46 } 47 48 cwq = &oct->dma_comp_wq; 49 INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion); 50 cwq->wk.ctxptr = oct; 51 oct->cmd_resp_state = OCT_DRV_ONLINE; 52 53 return ret; 54 } 55 56 void octeon_delete_response_list(struct octeon_device *oct) 57 { 58 cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work); 59 destroy_workqueue(oct->dma_comp_wq.wq); 60 } 61 62 int lio_process_ordered_list(struct octeon_device *octeon_dev, 63 u32 force_quit) 64 { 65 struct octeon_response_list *ordered_sc_list; 66 struct octeon_soft_command *sc; 67 int request_complete = 0; 68 int resp_to_process = MAX_ORD_REQS_TO_PROCESS; 69 u32 status; 70 u64 status64; 71 72 octeon_free_sc_done_list(octeon_dev); 73 74 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST]; 75 76 do { 77 spin_lock_bh(&ordered_sc_list->lock); 78 79 if (list_empty(&ordered_sc_list->head)) { 80 spin_unlock_bh(&ordered_sc_list->lock); 81 return 1; 82 } 83 84 sc = list_first_entry(&ordered_sc_list->head, 85 struct octeon_soft_command, node); 86 87 status = OCTEON_REQUEST_PENDING; 88 89 /* check if octeon has finished DMA'ing a response 90 * to where rptr is pointing to 91 */ 92 status64 = *sc->status_word; 93 94 if (status64 != COMPLETION_WORD_INIT) { 95 /* This logic ensures that all 64b have been written. 96 * 1. check byte 0 for non-FF 97 * 2. if non-FF, then swap result from BE to host order 98 * 3. check byte 7 (swapped to 0) for non-FF 99 * 4. if non-FF, use the low 32-bit status code 100 * 5. if either byte 0 or byte 7 is FF, don't use status 101 */ 102 if ((status64 & 0xff) != 0xff) { 103 octeon_swap_8B_data(&status64, 1); 104 if (((status64 & 0xff) != 0xff)) { 105 /* retrieve 16-bit firmware status */ 106 status = (u32)(status64 & 0xffffULL); 107 if (status) { 108 status = 109 FIRMWARE_STATUS_CODE(status); 110 } else { 111 /* i.e. no error */ 112 status = OCTEON_REQUEST_DONE; 113 } 114 } 115 } 116 } else if (unlikely(force_quit) || (sc->expiry_time && 117 time_after(jiffies, (unsigned long)sc->expiry_time))) { 118 struct octeon_instr_irh *irh = 119 (struct octeon_instr_irh *)&sc->cmd.cmd3.irh; 120 121 dev_err(&octeon_dev->pci_dev->dev, "%s: ", __func__); 122 dev_err(&octeon_dev->pci_dev->dev, 123 "cmd %x/%x/%llx/%llx failed, ", 124 irh->opcode, irh->subcode, 125 sc->cmd.cmd3.ossp[0], sc->cmd.cmd3.ossp[1]); 126 dev_err(&octeon_dev->pci_dev->dev, 127 "timeout (%ld, %ld)\n", 128 (long)jiffies, (long)sc->expiry_time); 129 status = OCTEON_REQUEST_TIMEOUT; 130 } 131 132 if (status != OCTEON_REQUEST_PENDING) { 133 sc->sc_status = status; 134 135 /* we have received a response or we have timed out */ 136 /* remove node from linked list */ 137 list_del(&sc->node); 138 atomic_dec(&octeon_dev->response_list 139 [OCTEON_ORDERED_SC_LIST]. 140 pending_req_count); 141 142 if (!sc->callback) { 143 atomic_inc(&octeon_dev->response_list 144 [OCTEON_DONE_SC_LIST]. 145 pending_req_count); 146 list_add_tail(&sc->node, 147 &octeon_dev->response_list 148 [OCTEON_DONE_SC_LIST].head); 149 150 if (unlikely(READ_ONCE(sc->caller_is_done))) { 151 /* caller does not wait for response 152 * from firmware 153 */ 154 if (status != OCTEON_REQUEST_DONE) { 155 struct octeon_instr_irh *irh; 156 157 irh = 158 (struct octeon_instr_irh *) 159 &sc->cmd.cmd3.irh; 160 dev_dbg 161 (&octeon_dev->pci_dev->dev, 162 "%s: sc failed: opcode=%x, ", 163 __func__, irh->opcode); 164 dev_dbg 165 (&octeon_dev->pci_dev->dev, 166 "subcode=%x, ossp[0]=%llx, ", 167 irh->subcode, 168 sc->cmd.cmd3.ossp[0]); 169 dev_dbg 170 (&octeon_dev->pci_dev->dev, 171 "ossp[1]=%llx, status=%d\n", 172 sc->cmd.cmd3.ossp[1], 173 status); 174 } 175 } else { 176 complete(&sc->complete); 177 } 178 179 spin_unlock_bh(&ordered_sc_list->lock); 180 } else { 181 /* sc with callback function */ 182 if (status == OCTEON_REQUEST_TIMEOUT) { 183 atomic_inc(&octeon_dev->response_list 184 [OCTEON_ZOMBIE_SC_LIST]. 185 pending_req_count); 186 list_add_tail(&sc->node, 187 &octeon_dev->response_list 188 [OCTEON_ZOMBIE_SC_LIST]. 189 head); 190 } 191 192 spin_unlock_bh(&ordered_sc_list->lock); 193 194 sc->callback(octeon_dev, status, 195 sc->callback_arg); 196 /* sc is freed by caller */ 197 } 198 199 request_complete++; 200 201 } else { 202 /* no response yet */ 203 request_complete = 0; 204 spin_unlock_bh 205 (&ordered_sc_list->lock); 206 } 207 208 /* If we hit the Max Ordered requests to process every loop, 209 * we quit 210 * and let this function be invoked the next time the poll 211 * thread runs 212 * to process the remaining requests. This function can take up 213 * the entire CPU if there is no upper limit to the requests 214 * processed. 215 */ 216 if (request_complete >= resp_to_process) 217 break; 218 } while (request_complete); 219 220 return 0; 221 } 222 223 static void oct_poll_req_completion(struct work_struct *work) 224 { 225 struct cavium_wk *wk = (struct cavium_wk *)work; 226 struct octeon_device *oct = (struct octeon_device *)wk->ctxptr; 227 struct cavium_wq *cwq = &oct->dma_comp_wq; 228 229 lio_process_ordered_list(oct, 0); 230 231 if (atomic_read(&oct->response_list 232 [OCTEON_ORDERED_SC_LIST].pending_req_count)) 233 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(1)); 234 } 235