1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2021 Broadcom. All Rights Reserved. The term 4 * “Broadcom” refers to Broadcom Inc. and/or its subsidiaries. 5 */ 6 7 #include "efct_driver.h" 8 #include "efct_hw.h" 9 #include "efct_io.h" 10 11 struct efct_io_pool { 12 struct efct *efct; 13 spinlock_t lock; /* IO pool lock */ 14 u32 io_num_ios; /* Total IOs allocated */ 15 struct efct_io *ios[EFCT_NUM_SCSI_IOS]; 16 struct list_head freelist; 17 18 }; 19 20 struct efct_io_pool * 21 efct_io_pool_create(struct efct *efct, u32 num_sgl) 22 { 23 u32 i = 0; 24 struct efct_io_pool *io_pool; 25 struct efct_io *io; 26 27 /* Allocate the IO pool */ 28 io_pool = kzalloc(sizeof(*io_pool), GFP_KERNEL); 29 if (!io_pool) 30 return NULL; 31 32 io_pool->efct = efct; 33 INIT_LIST_HEAD(&io_pool->freelist); 34 /* initialize IO pool lock */ 35 spin_lock_init(&io_pool->lock); 36 37 for (i = 0; i < EFCT_NUM_SCSI_IOS; i++) { 38 io = kzalloc(sizeof(*io), GFP_KERNEL); 39 if (!io) 40 break; 41 42 io_pool->io_num_ios++; 43 io_pool->ios[i] = io; 44 io->tag = i; 45 io->instance_index = i; 46 47 /* Allocate a response buffer */ 48 io->rspbuf.size = SCSI_RSP_BUF_LENGTH; 49 io->rspbuf.virt = dma_alloc_coherent(&efct->pci->dev, 50 io->rspbuf.size, 51 &io->rspbuf.phys, GFP_KERNEL); 52 if (!io->rspbuf.virt) { 53 efc_log_err(efct, "dma_alloc rspbuf failed\n"); 54 efct_io_pool_free(io_pool); 55 return NULL; 56 } 57 58 /* Allocate SGL */ 59 io->sgl = kzalloc(sizeof(*io->sgl) * num_sgl, GFP_KERNEL); 60 if (!io->sgl) { 61 efct_io_pool_free(io_pool); 62 return NULL; 63 } 64 65 io->sgl_allocated = num_sgl; 66 io->sgl_count = 0; 67 68 INIT_LIST_HEAD(&io->list_entry); 69 list_add_tail(&io->list_entry, &io_pool->freelist); 70 } 71 72 return io_pool; 73 } 74 75 int 76 efct_io_pool_free(struct efct_io_pool *io_pool) 77 { 78 struct efct *efct; 79 u32 i; 80 struct efct_io *io; 81 82 if (io_pool) { 83 efct = io_pool->efct; 84 85 for (i = 0; i < io_pool->io_num_ios; i++) { 86 io = io_pool->ios[i]; 87 if (!io) 88 continue; 89 90 kfree(io->sgl); 91 dma_free_coherent(&efct->pci->dev, 92 io->rspbuf.size, io->rspbuf.virt, 93 io->rspbuf.phys); 94 memset(&io->rspbuf, 0, sizeof(struct efc_dma)); 95 } 96 97 kfree(io_pool); 98 efct->xport->io_pool = NULL; 99 } 100 101 return 0; 102 } 103 104 struct efct_io * 105 efct_io_pool_io_alloc(struct efct_io_pool *io_pool) 106 { 107 struct efct_io *io = NULL; 108 struct efct *efct; 109 unsigned long flags = 0; 110 111 efct = io_pool->efct; 112 113 spin_lock_irqsave(&io_pool->lock, flags); 114 115 if (!list_empty(&io_pool->freelist)) { 116 io = list_first_entry(&io_pool->freelist, struct efct_io, 117 list_entry); 118 list_del_init(&io->list_entry); 119 } 120 121 spin_unlock_irqrestore(&io_pool->lock, flags); 122 123 if (!io) 124 return NULL; 125 126 io->io_type = EFCT_IO_TYPE_MAX; 127 io->hio_type = EFCT_HW_IO_MAX; 128 io->hio = NULL; 129 io->transferred = 0; 130 io->efct = efct; 131 io->timeout = 0; 132 io->sgl_count = 0; 133 io->tgt_task_tag = 0; 134 io->init_task_tag = 0; 135 io->hw_tag = 0; 136 io->display_name = "pending"; 137 io->seq_init = 0; 138 io->io_free = 0; 139 io->release = NULL; 140 atomic_add_return(1, &efct->xport->io_active_count); 141 atomic_add_return(1, &efct->xport->io_total_alloc); 142 return io; 143 } 144 145 /* Free an object used to track an IO */ 146 void 147 efct_io_pool_io_free(struct efct_io_pool *io_pool, struct efct_io *io) 148 { 149 struct efct *efct; 150 struct efct_hw_io *hio = NULL; 151 unsigned long flags = 0; 152 153 efct = io_pool->efct; 154 155 spin_lock_irqsave(&io_pool->lock, flags); 156 hio = io->hio; 157 io->hio = NULL; 158 io->io_free = 1; 159 INIT_LIST_HEAD(&io->list_entry); 160 list_add(&io->list_entry, &io_pool->freelist); 161 spin_unlock_irqrestore(&io_pool->lock, flags); 162 163 if (hio) 164 efct_hw_io_free(&efct->hw, hio); 165 166 atomic_sub_return(1, &efct->xport->io_active_count); 167 atomic_add_return(1, &efct->xport->io_total_free); 168 } 169 170 /* Find an I/O given it's node and ox_id */ 171 struct efct_io * 172 efct_io_find_tgt_io(struct efct *efct, struct efct_node *node, 173 u16 ox_id, u16 rx_id) 174 { 175 struct efct_io *io = NULL; 176 unsigned long flags = 0; 177 u8 found = false; 178 179 spin_lock_irqsave(&node->active_ios_lock, flags); 180 list_for_each_entry(io, &node->active_ios, list_entry) { 181 if ((io->cmd_tgt && io->init_task_tag == ox_id) && 182 (rx_id == 0xffff || io->tgt_task_tag == rx_id)) { 183 if (kref_get_unless_zero(&io->ref)) 184 found = true; 185 break; 186 } 187 } 188 spin_unlock_irqrestore(&node->active_ios_lock, flags); 189 return found ? io : NULL; 190 } 191