drivers/net/mlx4/cq.c

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4  * Copyright (c) 2005, 2006, 2007 Cisco Systems, Inc. All rights reserved.
   5  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   6  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #include <linux/init.h>
  38 #include <linux/hardirq.h>
  39
  40 #include <linux/mlx4/cmd.h>
  41 #include <linux/mlx4/cq.h>
  42
  43 #include "mlx4.h"
  44 #include "icm.h"
  45
  46 struct mlx4_cq_context {
  47         __be32                  flags;
  48         u16                     reserved1[3];
  49         __be16                  page_offset;
  50         __be32                  logsize_usrpage;
  51         __be16                  cq_period;
  52         __be16                  cq_max_count;
  53         u8                      reserved2[3];
  54         u8                      comp_eqn;
  55         u8                      log_page_size;
  56         u8                      reserved3[2];
  57         u8                      mtt_base_addr_h;
  58         __be32                  mtt_base_addr_l;
  59         __be32                  last_notified_index;
  60         __be32                  solicit_producer_index;
  61         __be32                  consumer_index;
  62         __be32                  producer_index;
  63         u32                     reserved4[2];
  64         __be64                  db_rec_addr;
  65 };
  66
  67 #define MLX4_CQ_STATUS_OK               ( 0 << 28)
  68 #define MLX4_CQ_STATUS_OVERFLOW         ( 9 << 28)
  69 #define MLX4_CQ_STATUS_WRITE_FAIL       (10 << 28)
  70 #define MLX4_CQ_FLAG_CC                 ( 1 << 18)
  71 #define MLX4_CQ_FLAG_OI                 ( 1 << 17)
  72 #define MLX4_CQ_STATE_ARMED             ( 9 <<  8)
  73 #define MLX4_CQ_STATE_ARMED_SOL         ( 6 <<  8)
  74 #define MLX4_EQ_STATE_FIRED             (10 <<  8)
  75
  76 void mlx4_cq_completion(struct mlx4_dev *dev, u32 cqn)
  77 {
  78         struct mlx4_cq *cq;
  79
  80         cq = radix_tree_lookup(&mlx4_priv(dev)->cq_table.tree,
  81                                cqn & (dev->caps.num_cqs - 1));
  82         if (!cq) {
  83                 mlx4_warn(dev, "Completion event for bogus CQ %08x\n", cqn);
  84                 return;
  85         }
  86
  87         ++cq->arm_sn;
  88
  89         cq->comp(cq);
  90 }
  91
  92 void mlx4_cq_event(struct mlx4_dev *dev, u32 cqn, int event_type)
  93 {
  94         struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table;
  95         struct mlx4_cq *cq;
  96
  97         spin_lock(&cq_table->lock);
  98
  99         cq = radix_tree_lookup(&cq_table->tree, cqn & (dev->caps.num_cqs - 1));
 100         if (cq)
 101                 atomic_inc(&cq->refcount);
 102
 103         spin_unlock(&cq_table->lock);
 104
 105         if (!cq) {
 106                 mlx4_warn(dev, "Async event for bogus CQ %08x\n", cqn);
 107                 return;
 108         }
 109
 110         cq->event(cq, event_type);
 111
 112         if (atomic_dec_and_test(&cq->refcount))
 113                 complete(&cq->free);
 114 }
 115
 116 static int mlx4_SW2HW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
 117                          int cq_num)
 118 {
 119         return mlx4_cmd(dev, mailbox->dma, cq_num, 0, MLX4_CMD_SW2HW_CQ,
 120                         MLX4_CMD_TIME_CLASS_A);
 121 }
 122
 123 static int mlx4_MODIFY_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
 124                          int cq_num, u32 opmod)
 125 {
 126         return mlx4_cmd(dev, mailbox->dma, cq_num, opmod, MLX4_CMD_MODIFY_CQ,
 127                         MLX4_CMD_TIME_CLASS_A);
 128 }
 129
 130 static int mlx4_HW2SW_CQ(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
 131                          int cq_num)
 132 {
 133         return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, cq_num,
 134                             mailbox ? 0 : 1, MLX4_CMD_HW2SW_CQ,
 135                             MLX4_CMD_TIME_CLASS_A);
 136 }
 137
 138 int mlx4_cq_modify(struct mlx4_dev *dev, struct mlx4_cq *cq,
 139                    u16 count, u16 period)
 140 {
 141         struct mlx4_cmd_mailbox *mailbox;
 142         struct mlx4_cq_context *cq_context;
 143         int err;
 144
 145         mailbox = mlx4_alloc_cmd_mailbox(dev);
 146         if (IS_ERR(mailbox))
 147                 return PTR_ERR(mailbox);
 148
 149         cq_context = mailbox->buf;
 150         memset(cq_context, 0, sizeof *cq_context);
 151
 152         cq_context->cq_max_count = cpu_to_be16(count);
 153         cq_context->cq_period    = cpu_to_be16(period);
 154
 155         err = mlx4_MODIFY_CQ(dev, mailbox, cq->cqn, 1);
 156
 157         mlx4_free_cmd_mailbox(dev, mailbox);
 158         return err;
 159 }
 160 EXPORT_SYMBOL_GPL(mlx4_cq_modify);
 161
 162 int mlx4_cq_resize(struct mlx4_dev *dev, struct mlx4_cq *cq,
 163                    int entries, struct mlx4_mtt *mtt)
 164 {
 165         struct mlx4_cmd_mailbox *mailbox;
 166         struct mlx4_cq_context *cq_context;
 167         u64 mtt_addr;
 168         int err;
 169
 170         mailbox = mlx4_alloc_cmd_mailbox(dev);
 171         if (IS_ERR(mailbox))
 172                 return PTR_ERR(mailbox);
 173
 174         cq_context = mailbox->buf;
 175         memset(cq_context, 0, sizeof *cq_context);
 176
 177         cq_context->logsize_usrpage = cpu_to_be32(ilog2(entries) << 24);
 178         cq_context->log_page_size   = mtt->page_shift - 12;
 179         mtt_addr = mlx4_mtt_addr(dev, mtt);
 180         cq_context->mtt_base_addr_h = mtt_addr >> 32;
 181         cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
 182
 183         err = mlx4_MODIFY_CQ(dev, mailbox, cq->cqn, 0);
 184
 185         mlx4_free_cmd_mailbox(dev, mailbox);
 186         return err;
 187 }
 188 EXPORT_SYMBOL_GPL(mlx4_cq_resize);
 189
 190 int mlx4_cq_alloc(struct mlx4_dev *dev, int nent, struct mlx4_mtt *mtt,
 191                   struct mlx4_uar *uar, u64 db_rec, struct mlx4_cq *cq,
 192                   int collapsed)
 193 {
 194         struct mlx4_priv *priv = mlx4_priv(dev);
 195         struct mlx4_cq_table *cq_table = &priv->cq_table;
 196         struct mlx4_cmd_mailbox *mailbox;
 197         struct mlx4_cq_context *cq_context;
 198         u64 mtt_addr;
 199         int err;
 200
 201         cq->cqn = mlx4_bitmap_alloc(&cq_table->bitmap);
 202         if (cq->cqn == -1)
 203                 return -ENOMEM;
 204
 205         err = mlx4_table_get(dev, &cq_table->table, cq->cqn);
 206         if (err)
 207                 goto err_out;
 208
 209         err = mlx4_table_get(dev, &cq_table->cmpt_table, cq->cqn);
 210         if (err)
 211                 goto err_put;
 212
 213         spin_lock_irq(&cq_table->lock);
 214         err = radix_tree_insert(&cq_table->tree, cq->cqn, cq);
 215         spin_unlock_irq(&cq_table->lock);
 216         if (err)
 217                 goto err_cmpt_put;
 218
 219         mailbox = mlx4_alloc_cmd_mailbox(dev);
 220         if (IS_ERR(mailbox)) {
 221                 err = PTR_ERR(mailbox);
 222                 goto err_radix;
 223         }
 224
 225         cq_context = mailbox->buf;
 226         memset(cq_context, 0, sizeof *cq_context);
 227
 228         cq_context->flags           = cpu_to_be32(!!collapsed << 18);
 229         cq_context->logsize_usrpage = cpu_to_be32((ilog2(nent) << 24) | uar->index);
 230         cq_context->comp_eqn        = priv->eq_table.eq[MLX4_EQ_COMP].eqn;
 231         cq_context->log_page_size   = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
 232
 233         mtt_addr = mlx4_mtt_addr(dev, mtt);
 234         cq_context->mtt_base_addr_h = mtt_addr >> 32;
 235         cq_context->mtt_base_addr_l = cpu_to_be32(mtt_addr & 0xffffffff);
 236         cq_context->db_rec_addr     = cpu_to_be64(db_rec);
 237
 238         err = mlx4_SW2HW_CQ(dev, mailbox, cq->cqn);
 239         mlx4_free_cmd_mailbox(dev, mailbox);
 240         if (err)
 241                 goto err_radix;
 242
 243         cq->cons_index = 0;
 244         cq->arm_sn     = 1;
 245         cq->uar        = uar;
 246         atomic_set(&cq->refcount, 1);
 247         init_completion(&cq->free);
 248
 249         return 0;
 250
 251 err_radix:
 252         spin_lock_irq(&cq_table->lock);
 253         radix_tree_delete(&cq_table->tree, cq->cqn);
 254         spin_unlock_irq(&cq_table->lock);
 255
 256 err_cmpt_put:
 257         mlx4_table_put(dev, &cq_table->cmpt_table, cq->cqn);
 258
 259 err_put:
 260         mlx4_table_put(dev, &cq_table->table, cq->cqn);
 261
 262 err_out:
 263         mlx4_bitmap_free(&cq_table->bitmap, cq->cqn);
 264
 265         return err;
 266 }
 267 EXPORT_SYMBOL_GPL(mlx4_cq_alloc);
 268
 269 void mlx4_cq_free(struct mlx4_dev *dev, struct mlx4_cq *cq)
 270 {
 271         struct mlx4_priv *priv = mlx4_priv(dev);
 272         struct mlx4_cq_table *cq_table = &priv->cq_table;
 273         int err;
 274
 275         err = mlx4_HW2SW_CQ(dev, NULL, cq->cqn);
 276         if (err)
 277                 mlx4_warn(dev, "HW2SW_CQ failed (%d) for CQN %06x\n", err, cq->cqn);
 278
 279         synchronize_irq(priv->eq_table.eq[MLX4_EQ_COMP].irq);
 280
 281         spin_lock_irq(&cq_table->lock);
 282         radix_tree_delete(&cq_table->tree, cq->cqn);
 283         spin_unlock_irq(&cq_table->lock);
 284
 285         if (atomic_dec_and_test(&cq->refcount))
 286                 complete(&cq->free);
 287         wait_for_completion(&cq->free);
 288
 289         mlx4_table_put(dev, &cq_table->table, cq->cqn);
 290         mlx4_bitmap_free(&cq_table->bitmap, cq->cqn);
 291 }
 292 EXPORT_SYMBOL_GPL(mlx4_cq_free);
 293
 294 int mlx4_init_cq_table(struct mlx4_dev *dev)
 295 {
 296         struct mlx4_cq_table *cq_table = &mlx4_priv(dev)->cq_table;
 297         int err;
 298
 299         spin_lock_init(&cq_table->lock);
 300         INIT_RADIX_TREE(&cq_table->tree, GFP_ATOMIC);
 301
 302         err = mlx4_bitmap_init(&cq_table->bitmap, dev->caps.num_cqs,
 303                                dev->caps.num_cqs - 1, dev->caps.reserved_cqs);
 304         if (err)
 305                 return err;
 306
 307         return 0;
 308 }
 309
 310 void mlx4_cleanup_cq_table(struct mlx4_dev *dev)
 311 {
 312         /* Nothing to do to clean up radix_tree */
 313         mlx4_bitmap_cleanup(&mlx4_priv(dev)->cq_table.bitmap);
 314 }