1 /* 2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <linux/kernel.h> 34 #include <linux/module.h> 35 #include <linux/hardirq.h> 36 #include <linux/mlx5/driver.h> 37 #include <rdma/ib_verbs.h> 38 #include <linux/mlx5/cq.h> 39 #include "mlx5_core.h" 40 #include "lib/eq.h" 41 42 #define TASKLET_MAX_TIME 2 43 #define TASKLET_MAX_TIME_JIFFIES msecs_to_jiffies(TASKLET_MAX_TIME) 44 45 void mlx5_cq_tasklet_cb(struct tasklet_struct *t) 46 { 47 unsigned long flags; 48 unsigned long end = jiffies + TASKLET_MAX_TIME_JIFFIES; 49 struct mlx5_eq_tasklet *ctx = from_tasklet(ctx, t, task); 50 struct mlx5_core_cq *mcq; 51 struct mlx5_core_cq *temp; 52 53 spin_lock_irqsave(&ctx->lock, flags); 54 list_splice_tail_init(&ctx->list, &ctx->process_list); 55 spin_unlock_irqrestore(&ctx->lock, flags); 56 57 list_for_each_entry_safe(mcq, temp, &ctx->process_list, 58 tasklet_ctx.list) { 59 list_del_init(&mcq->tasklet_ctx.list); 60 mcq->tasklet_ctx.comp(mcq, NULL); 61 mlx5_cq_put(mcq); 62 if (time_after(jiffies, end)) 63 break; 64 } 65 66 if (!list_empty(&ctx->process_list)) 67 tasklet_schedule(&ctx->task); 68 } 69 70 static void mlx5_add_cq_to_tasklet(struct mlx5_core_cq *cq, 71 struct mlx5_eqe *eqe) 72 { 73 unsigned long flags; 74 struct mlx5_eq_tasklet *tasklet_ctx = cq->tasklet_ctx.priv; 75 76 spin_lock_irqsave(&tasklet_ctx->lock, flags); 77 /* When migrating CQs between EQs will be implemented, please note 78 * that you need to sync this point. It is possible that 79 * while migrating a CQ, completions on the old EQs could 80 * still arrive. 81 */ 82 if (list_empty_careful(&cq->tasklet_ctx.list)) { 83 mlx5_cq_hold(cq); 84 list_add_tail(&cq->tasklet_ctx.list, &tasklet_ctx->list); 85 } 86 spin_unlock_irqrestore(&tasklet_ctx->lock, flags); 87 } 88 89 int mlx5_core_create_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq, 90 u32 *in, int inlen, u32 *out, int outlen) 91 { 92 int eqn = MLX5_GET(cqc, MLX5_ADDR_OF(create_cq_in, in, cq_context), 93 c_eqn_or_apu_element); 94 u32 din[MLX5_ST_SZ_DW(destroy_cq_in)] = {}; 95 struct mlx5_eq_comp *eq; 96 int err; 97 98 eq = mlx5_eqn2comp_eq(dev, eqn); 99 if (IS_ERR(eq)) 100 return PTR_ERR(eq); 101 102 memset(out, 0, outlen); 103 MLX5_SET(create_cq_in, in, opcode, MLX5_CMD_OP_CREATE_CQ); 104 err = mlx5_cmd_exec(dev, in, inlen, out, outlen); 105 if (err) 106 return err; 107 108 cq->cqn = MLX5_GET(create_cq_out, out, cqn); 109 cq->cons_index = 0; 110 cq->arm_sn = 0; 111 cq->eq = eq; 112 cq->uid = MLX5_GET(create_cq_in, in, uid); 113 refcount_set(&cq->refcount, 1); 114 init_completion(&cq->free); 115 if (!cq->comp) 116 cq->comp = mlx5_add_cq_to_tasklet; 117 /* assuming CQ will be deleted before the EQ */ 118 cq->tasklet_ctx.priv = &eq->tasklet_ctx; 119 INIT_LIST_HEAD(&cq->tasklet_ctx.list); 120 121 /* Add to comp EQ CQ tree to recv comp events */ 122 err = mlx5_eq_add_cq(&eq->core, cq); 123 if (err) 124 goto err_cmd; 125 126 /* Add to async EQ CQ tree to recv async events */ 127 err = mlx5_eq_add_cq(mlx5_get_async_eq(dev), cq); 128 if (err) 129 goto err_cq_add; 130 131 cq->pid = current->pid; 132 err = mlx5_debug_cq_add(dev, cq); 133 if (err) 134 mlx5_core_dbg(dev, "failed adding CP 0x%x to debug file system\n", 135 cq->cqn); 136 137 cq->uar = dev->priv.uar; 138 cq->irqn = eq->core.irqn; 139 140 return 0; 141 142 err_cq_add: 143 mlx5_eq_del_cq(&eq->core, cq); 144 err_cmd: 145 MLX5_SET(destroy_cq_in, din, opcode, MLX5_CMD_OP_DESTROY_CQ); 146 MLX5_SET(destroy_cq_in, din, cqn, cq->cqn); 147 MLX5_SET(destroy_cq_in, din, uid, cq->uid); 148 mlx5_cmd_exec_in(dev, destroy_cq, din); 149 return err; 150 } 151 EXPORT_SYMBOL(mlx5_core_create_cq); 152 153 int mlx5_core_destroy_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq) 154 { 155 u32 in[MLX5_ST_SZ_DW(destroy_cq_in)] = {}; 156 int err; 157 158 mlx5_debug_cq_remove(dev, cq); 159 160 mlx5_eq_del_cq(mlx5_get_async_eq(dev), cq); 161 mlx5_eq_del_cq(&cq->eq->core, cq); 162 163 MLX5_SET(destroy_cq_in, in, opcode, MLX5_CMD_OP_DESTROY_CQ); 164 MLX5_SET(destroy_cq_in, in, cqn, cq->cqn); 165 MLX5_SET(destroy_cq_in, in, uid, cq->uid); 166 err = mlx5_cmd_exec_in(dev, destroy_cq, in); 167 168 synchronize_irq(cq->irqn); 169 170 mlx5_cq_put(cq); 171 wait_for_completion(&cq->free); 172 173 return err; 174 } 175 EXPORT_SYMBOL(mlx5_core_destroy_cq); 176 177 int mlx5_core_query_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq, 178 u32 *out) 179 { 180 u32 in[MLX5_ST_SZ_DW(query_cq_in)] = {}; 181 182 MLX5_SET(query_cq_in, in, opcode, MLX5_CMD_OP_QUERY_CQ); 183 MLX5_SET(query_cq_in, in, cqn, cq->cqn); 184 return mlx5_cmd_exec_inout(dev, query_cq, in, out); 185 } 186 EXPORT_SYMBOL(mlx5_core_query_cq); 187 188 int mlx5_core_modify_cq(struct mlx5_core_dev *dev, struct mlx5_core_cq *cq, 189 u32 *in, int inlen) 190 { 191 u32 out[MLX5_ST_SZ_DW(modify_cq_out)] = {}; 192 193 MLX5_SET(modify_cq_in, in, opcode, MLX5_CMD_OP_MODIFY_CQ); 194 MLX5_SET(modify_cq_in, in, uid, cq->uid); 195 return mlx5_cmd_exec(dev, in, inlen, out, sizeof(out)); 196 } 197 EXPORT_SYMBOL(mlx5_core_modify_cq); 198 199 int mlx5_core_modify_cq_moderation(struct mlx5_core_dev *dev, 200 struct mlx5_core_cq *cq, 201 u16 cq_period, 202 u16 cq_max_count) 203 { 204 u32 in[MLX5_ST_SZ_DW(modify_cq_in)] = {}; 205 void *cqc; 206 207 MLX5_SET(modify_cq_in, in, cqn, cq->cqn); 208 cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context); 209 MLX5_SET(cqc, cqc, cq_period, cq_period); 210 MLX5_SET(cqc, cqc, cq_max_count, cq_max_count); 211 MLX5_SET(modify_cq_in, in, 212 modify_field_select_resize_field_select.modify_field_select.modify_field_select, 213 MLX5_CQ_MODIFY_PERIOD | MLX5_CQ_MODIFY_COUNT); 214 215 return mlx5_core_modify_cq(dev, cq, in, sizeof(in)); 216 } 217 EXPORT_SYMBOL(mlx5_core_modify_cq_moderation); 218