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 ordered_sc_list = &octeon_dev->response_list[OCTEON_ORDERED_SC_LIST]; 73 74 do { 75 spin_lock_bh(&ordered_sc_list->lock); 76 77 if (list_empty(&ordered_sc_list->head)) { 78 spin_unlock_bh(&ordered_sc_list->lock); 79 return 1; 80 } 81 82 sc = list_first_entry(&ordered_sc_list->head, 83 struct octeon_soft_command, node); 84 85 status = OCTEON_REQUEST_PENDING; 86 87 /* check if octeon has finished DMA'ing a response 88 * to where rptr is pointing to 89 */ 90 status64 = *sc->status_word; 91 92 if (status64 != COMPLETION_WORD_INIT) { 93 /* This logic ensures that all 64b have been written. 94 * 1. check byte 0 for non-FF 95 * 2. if non-FF, then swap result from BE to host order 96 * 3. check byte 7 (swapped to 0) for non-FF 97 * 4. if non-FF, use the low 32-bit status code 98 * 5. if either byte 0 or byte 7 is FF, don't use status 99 */ 100 if ((status64 & 0xff) != 0xff) { 101 octeon_swap_8B_data(&status64, 1); 102 if (((status64 & 0xff) != 0xff)) { 103 /* retrieve 16-bit firmware status */ 104 status = (u32)(status64 & 0xffffULL); 105 if (status) { 106 status = 107 FIRMWARE_STATUS_CODE(status); 108 } else { 109 /* i.e. no error */ 110 status = OCTEON_REQUEST_DONE; 111 } 112 } 113 } 114 } else if (force_quit || (sc->timeout && 115 time_after(jiffies, (unsigned long)sc->timeout))) { 116 dev_err(&octeon_dev->pci_dev->dev, "%s: cmd failed, timeout (%ld, %ld)\n", 117 __func__, (long)jiffies, (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); 166 167 if (atomic_read(&oct->response_list 168 [OCTEON_ORDERED_SC_LIST].pending_req_count)) 169 queue_delayed_work(cwq->wq, &cwq->wk.work, msecs_to_jiffies(1)); 170 } 171