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 EXPORT_SYMBOL_GPL(octeon_setup_response_list); 56 57 void octeon_delete_response_list(struct octeon_device *oct) 58 { 59 cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work); 60 destroy_workqueue(oct->dma_comp_wq.wq); 61 } 62 EXPORT_SYMBOL_GPL(octeon_delete_response_list); 63 64 int lio_process_ordered_list(struct octeon_device *octeon_dev, 65 u32 force_quit) 66 { 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; 71 u32 status; 72 u64 status64; 73 74 octeon_free_sc_done_list(octeon_dev); 75 76 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST]; 77 78 do { 79 spin_lock_bh(&ordered_sc_list->lock); 80 81 if (list_empty(&ordered_sc_list->head)) { 82 spin_unlock_bh(&ordered_sc_list->lock); 83 return 1; 84 } 85 86 sc = list_first_entry(&ordered_sc_list->head, 87 struct octeon_soft_command, node); 88 89 status = OCTEON_REQUEST_PENDING; 90 91 /* check if octeon has finished DMA'ing a response 92 * to where rptr is pointing to 93 */ 94 status64 = *sc->status_word; 95 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 103 */ 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); 109 if (status) { 110 status = 111 FIRMWARE_STATUS_CODE(status); 112 } else { 113 /* i.e. no error */ 114 status = OCTEON_REQUEST_DONE; 115 } 116 } 117 } 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; 122 123 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; 132 } 133 134 if (status != OCTEON_REQUEST_PENDING) { 135 sc->sc_status = status; 136 137 /* we have received a response or we have timed out */ 138 /* remove node from linked list */ 139 list_del(&sc->node); 140 atomic_dec(&octeon_dev->response_list 141 [OCTEON_ORDERED_SC_LIST]. 142 pending_req_count); 143 144 if (!sc->callback) { 145 atomic_inc(&octeon_dev->response_list 146 [OCTEON_DONE_SC_LIST]. 147 pending_req_count); 148 list_add_tail(&sc->node, 149 &octeon_dev->response_list 150 [OCTEON_DONE_SC_LIST].head); 151 152 if (unlikely(READ_ONCE(sc->caller_is_done))) { 153 /* caller does not wait for response 154 * from firmware 155 */ 156 if (status != OCTEON_REQUEST_DONE) { 157 struct octeon_instr_irh *irh; 158 159 irh = 160 (struct octeon_instr_irh *) 161 &sc->cmd.cmd3.irh; 162 dev_dbg 163 (&octeon_dev->pci_dev->dev, 164 "%s: sc failed: opcode=%x, ", 165 __func__, irh->opcode); 166 dev_dbg 167 (&octeon_dev->pci_dev->dev, 168 "subcode=%x, ossp[0]=%llx, ", 169 irh->subcode, 170 sc->cmd.cmd3.ossp[0]); 171 dev_dbg 172 (&octeon_dev->pci_dev->dev, 173 "ossp[1]=%llx, status=%d\n", 174 sc->cmd.cmd3.ossp[1], 175 status); 176 } 177 } else { 178 complete(&sc->complete); 179 } 180 181 spin_unlock_bh(&ordered_sc_list->lock); 182 } else { 183 /* sc with callback function */ 184 if (status == OCTEON_REQUEST_TIMEOUT) { 185 atomic_inc(&octeon_dev->response_list 186 [OCTEON_ZOMBIE_SC_LIST]. 187 pending_req_count); 188 list_add_tail(&sc->node, 189 &octeon_dev->response_list 190 [OCTEON_ZOMBIE_SC_LIST]. 191 head); 192 } 193 194 spin_unlock_bh(&ordered_sc_list->lock); 195 196 sc->callback(octeon_dev, status, 197 sc->callback_arg); 198 /* sc is freed by caller */ 199 } 200 201 request_complete++; 202 203 } else { 204 /* no response yet */ 205 request_complete = 0; 206 spin_unlock_bh 207 (&ordered_sc_list->lock); 208 } 209 210 /* If we hit the Max Ordered requests to process every loop, 211 * we quit 212 * and let this function be invoked the next time the poll 213 * thread runs 214 * to process the remaining requests. This function can take up 215 * the entire CPU if there is no upper limit to the requests 216 * processed. 217 */ 218 if (request_complete >= resp_to_process) 219 break; 220 } while (request_complete); 221 222 return 0; 223 } 224 EXPORT_SYMBOL_GPL(lio_process_ordered_list); 225 226 static void oct_poll_req_completion(struct work_struct *work) 227 { 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; 231 232 lio_process_ordered_list(oct, 0); 233 234 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)); 237 } 238