1 /********************************************************************** 2 * Author: Cavium, Inc. 3 * 4 * Contact: support@cavium.com 5 * Please include "LiquidIO" in the subject. 6 * 7 * Copyright (c) 2003-2015 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 * 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" 30 31 static void oct_poll_req_completion(struct work_struct *work); 32 33 int octeon_setup_response_list(struct octeon_device *oct) 34 { 35 int i, ret = 0; 36 struct cavium_wq *cwq; 37 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); 42 } 43 spin_lock_init(&oct->cmd_resp_wqlock); 44 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"); 48 return -ENOMEM; 49 } 50 51 cwq = &oct->dma_comp_wq; 52 INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion); 53 cwq->wk.ctxptr = oct; 54 oct->cmd_resp_state = OCT_DRV_ONLINE; 55 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(50)); 56 57 return ret; 58 } 59 60 void octeon_delete_response_list(struct octeon_device *oct) 61 { 62 cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work); 63 destroy_workqueue(oct->dma_comp_wq.wq); 64 } 65 66 int lio_process_ordered_list(struct octeon_device *octeon_dev, 67 u32 force_quit) 68 { 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; 73 u32 status; 74 u64 status64; 75 struct octeon_instr_rdp *rdp; 76 u64 rptr; 77 78 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST]; 79 80 do { 81 spin_lock_bh(&ordered_sc_list->lock); 82 83 if (ordered_sc_list->head.next == &ordered_sc_list->head) { 84 spin_unlock_bh(&ordered_sc_list->lock); 85 return 1; 86 } 87 88 sc = (struct octeon_soft_command *)ordered_sc_list-> 89 head.next; 90 if (OCTEON_CN23XX_PF(octeon_dev)) { 91 rdp = (struct octeon_instr_rdp *)&sc->cmd.cmd3.rdp; 92 rptr = sc->cmd.cmd3.rptr; 93 } else { 94 rdp = (struct octeon_instr_rdp *)&sc->cmd.cmd2.rdp; 95 rptr = sc->cmd.cmd2.rptr; 96 } 97 98 status = OCTEON_REQUEST_PENDING; 99 100 /* check if octeon has finished DMA'ing a response 101 * to where rptr is pointing to 102 */ 103 dma_sync_single_for_cpu(&octeon_dev->pci_dev->dev, 104 rptr, rdp->rlen, 105 DMA_FROM_DEVICE); 106 status64 = *sc->status_word; 107 108 if (status64 != COMPLETION_WORD_INIT) { 109 if ((status64 & 0xff) != 0xff) { 110 octeon_swap_8B_data(&status64, 1); 111 if (((status64 & 0xff) != 0xff)) { 112 status = (u32)(status64 & 113 0xffffffffULL); 114 } 115 } 116 } else if (force_quit || (sc->timeout && 117 time_after(jiffies, (unsigned long)sc->timeout))) { 118 status = OCTEON_REQUEST_TIMEOUT; 119 } 120 121 if (status != OCTEON_REQUEST_PENDING) { 122 /* we have received a response or we have timed out */ 123 /* remove node from linked list */ 124 list_del(&sc->node); 125 atomic_dec(&octeon_dev->response_list 126 [OCTEON_ORDERED_SC_LIST]. 127 pending_req_count); 128 spin_unlock_bh 129 (&ordered_sc_list->lock); 130 131 if (sc->callback) 132 sc->callback(octeon_dev, status, 133 sc->callback_arg); 134 135 request_complete++; 136 137 } else { 138 /* no response yet */ 139 request_complete = 0; 140 spin_unlock_bh 141 (&ordered_sc_list->lock); 142 } 143 144 /* If we hit the Max Ordered requests to process every loop, 145 * we quit 146 * and let this function be invoked the next time the poll 147 * thread runs 148 * to process the remaining requests. This function can take up 149 * the entire CPU if there is no upper limit to the requests 150 * processed. 151 */ 152 if (request_complete >= resp_to_process) 153 break; 154 } while (request_complete); 155 156 return 0; 157 } 158 159 static void oct_poll_req_completion(struct work_struct *work) 160 { 161 struct cavium_wk *wk = (struct cavium_wk *)work; 162 struct octeon_device *oct = (struct octeon_device *)wk->ctxptr; 163 struct cavium_wq *cwq = &oct->dma_comp_wq; 164 165 lio_process_ordered_list(oct, 0); 166 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(50)); 167 } 168