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/version.h> 23 #include <linux/types.h> 24 #include <linux/list.h> 25 #include <linux/interrupt.h> 26 #include <linux/dma-mapping.h> 27 #include <linux/pci.h> 28 #include <linux/kthread.h> 29 #include <linux/netdevice.h> 30 #include "octeon_config.h" 31 #include "liquidio_common.h" 32 #include "octeon_droq.h" 33 #include "octeon_iq.h" 34 #include "response_manager.h" 35 #include "octeon_device.h" 36 #include "octeon_nic.h" 37 #include "octeon_main.h" 38 #include "octeon_network.h" 39 #include "cn66xx_regs.h" 40 #include "cn66xx_device.h" 41 #include "cn68xx_regs.h" 42 #include "cn68xx_device.h" 43 #include "liquidio_image.h" 44 45 static void oct_poll_req_completion(struct work_struct *work); 46 47 int octeon_setup_response_list(struct octeon_device *oct) 48 { 49 int i, ret = 0; 50 struct cavium_wq *cwq; 51 52 for (i = 0; i < MAX_RESPONSE_LISTS; i++) { 53 INIT_LIST_HEAD(&oct->response_list[i].head); 54 spin_lock_init(&oct->response_list[i].lock); 55 atomic_set(&oct->response_list[i].pending_req_count, 0); 56 } 57 58 oct->dma_comp_wq.wq = create_workqueue("dma-comp"); 59 if (!oct->dma_comp_wq.wq) { 60 dev_err(&oct->pci_dev->dev, "failed to create wq thread\n"); 61 return -ENOMEM; 62 } 63 64 cwq = &oct->dma_comp_wq; 65 INIT_DELAYED_WORK(&cwq->wk.work, oct_poll_req_completion); 66 cwq->wk.ctxptr = oct; 67 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(100)); 68 69 return ret; 70 } 71 72 void octeon_delete_response_list(struct octeon_device *oct) 73 { 74 cancel_delayed_work_sync(&oct->dma_comp_wq.wk.work); 75 flush_workqueue(oct->dma_comp_wq.wq); 76 destroy_workqueue(oct->dma_comp_wq.wq); 77 } 78 79 int lio_process_ordered_list(struct octeon_device *octeon_dev, 80 u32 force_quit) 81 { 82 struct octeon_response_list *ordered_sc_list; 83 struct octeon_soft_command *sc; 84 int request_complete = 0; 85 int resp_to_process = MAX_ORD_REQS_TO_PROCESS; 86 u32 status; 87 u64 status64; 88 struct octeon_instr_rdp *rdp; 89 90 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST]; 91 92 do { 93 spin_lock_bh(&ordered_sc_list->lock); 94 95 if (ordered_sc_list->head.next == &ordered_sc_list->head) { 96 /* ordered_sc_list is empty; there is 97 * nothing to process 98 */ 99 spin_unlock_bh 100 (&ordered_sc_list->lock); 101 return 1; 102 } 103 104 sc = (struct octeon_soft_command *)ordered_sc_list-> 105 head.next; 106 rdp = (struct octeon_instr_rdp *)&sc->cmd.rdp; 107 108 status = OCTEON_REQUEST_PENDING; 109 110 /* check if octeon has finished DMA'ing a response 111 * to where rptr is pointing to 112 */ 113 dma_sync_single_for_cpu(&octeon_dev->pci_dev->dev, 114 sc->cmd.rptr, rdp->rlen, 115 DMA_FROM_DEVICE); 116 status64 = *sc->status_word; 117 118 if (status64 != COMPLETION_WORD_INIT) { 119 if ((status64 & 0xff) != 0xff) { 120 octeon_swap_8B_data(&status64, 1); 121 if (((status64 & 0xff) != 0xff)) { 122 status = (u32)(status64 & 123 0xffffffffULL); 124 } 125 } 126 } else if (force_quit || (sc->timeout && 127 time_after(jiffies, (unsigned long)sc->timeout))) { 128 status = OCTEON_REQUEST_TIMEOUT; 129 } 130 131 if (status != OCTEON_REQUEST_PENDING) { 132 /* we have received a response or we have timed out */ 133 /* remove node from linked list */ 134 list_del(&sc->node); 135 atomic_dec(&octeon_dev->response_list 136 [OCTEON_ORDERED_SC_LIST]. 137 pending_req_count); 138 spin_unlock_bh 139 (&ordered_sc_list->lock); 140 141 if (sc->callback) 142 sc->callback(octeon_dev, status, 143 sc->callback_arg); 144 145 request_complete++; 146 147 } else { 148 /* no response yet */ 149 request_complete = 0; 150 spin_unlock_bh 151 (&ordered_sc_list->lock); 152 } 153 154 /* If we hit the Max Ordered requests to process every loop, 155 * we quit 156 * and let this function be invoked the next time the poll 157 * thread runs 158 * to process the remaining requests. This function can take up 159 * the entire CPU if there is no upper limit to the requests 160 * processed. 161 */ 162 if (request_complete >= resp_to_process) 163 break; 164 } while (request_complete); 165 166 return 0; 167 } 168 169 static void oct_poll_req_completion(struct work_struct *work) 170 { 171 struct cavium_wk *wk = (struct cavium_wk *)work; 172 struct octeon_device *oct = (struct octeon_device *)wk->ctxptr; 173 struct cavium_wq *cwq = &oct->dma_comp_wq; 174 175 lio_process_ordered_list(oct, 0); 176 177 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(100)); 178 } 179