drivers/infiniband/hw/cxgb3/cxio_resource.c

   1 /*
   2  * Copyright (c) 2006 Chelsio, Inc. 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 /* Crude resource management */
  33 #include <linux/kernel.h>
  34 #include <linux/random.h>
  35 #include <linux/slab.h>
  36 #include <linux/kfifo.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/errno.h>
  39 #include "cxio_resource.h"
  40 #include "cxio_hal.h"
  41
  42 static struct kfifo rhdl_fifo;
  43 static spinlock_t rhdl_fifo_lock;
  44
  45 #define RANDOM_SIZE 16
  46
  47 static int __cxio_init_resource_fifo(struct kfifo *fifo,
  48                                    spinlock_t *fifo_lock,
  49                                    u32 nr, u32 skip_low,
  50                                    u32 skip_high,
  51                                    int random)
  52 {
  53         u32 i, j, entry = 0, idx;
  54         u32 random_bytes;
  55         u32 rarray[16];
  56         spin_lock_init(fifo_lock);
  57
  58         if (kfifo_alloc(fifo, nr * sizeof(u32), GFP_KERNEL))
  59                 return -ENOMEM;
  60
  61         for (i = 0; i < skip_low + skip_high; i++)
  62                 kfifo_in(fifo, (unsigned char *) &entry, sizeof(u32));
  63         if (random) {
  64                 j = 0;
  65                 random_bytes = prandom_u32();
  66                 for (i = 0; i < RANDOM_SIZE; i++)
  67                         rarray[i] = i + skip_low;
  68                 for (i = skip_low + RANDOM_SIZE; i < nr - skip_high; i++) {
  69                         if (j >= RANDOM_SIZE) {
  70                                 j = 0;
  71                                 random_bytes = prandom_u32();
  72                         }
  73                         idx = (random_bytes >> (j * 2)) & 0xF;
  74                         kfifo_in(fifo,
  75                                 (unsigned char *) &rarray[idx],
  76                                 sizeof(u32));
  77                         rarray[idx] = i;
  78                         j++;
  79                 }
  80                 for (i = 0; i < RANDOM_SIZE; i++)
  81                         kfifo_in(fifo,
  82                                 (unsigned char *) &rarray[i],
  83                                 sizeof(u32));
  84         } else
  85                 for (i = skip_low; i < nr - skip_high; i++)
  86                         kfifo_in(fifo, (unsigned char *) &i, sizeof(u32));
  87
  88         for (i = 0; i < skip_low + skip_high; i++)
  89                 if (kfifo_out_locked(fifo, (unsigned char *) &entry,
  90                                 sizeof(u32), fifo_lock) != sizeof(u32))
  91                                         break;
  92         return 0;
  93 }
  94
  95 static int cxio_init_resource_fifo(struct kfifo *fifo, spinlock_t * fifo_lock,
  96                                    u32 nr, u32 skip_low, u32 skip_high)
  97 {
  98         return (__cxio_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
  99                                           skip_high, 0));
 100 }
 101
 102 static int cxio_init_resource_fifo_random(struct kfifo *fifo,
 103                                    spinlock_t * fifo_lock,
 104                                    u32 nr, u32 skip_low, u32 skip_high)
 105 {
 106
 107         return (__cxio_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
 108                                           skip_high, 1));
 109 }
 110
 111 static int cxio_init_qpid_fifo(struct cxio_rdev *rdev_p)
 112 {
 113         u32 i;
 114
 115         spin_lock_init(&rdev_p->rscp->qpid_fifo_lock);
 116
 117         if (kfifo_alloc(&rdev_p->rscp->qpid_fifo, T3_MAX_NUM_QP * sizeof(u32),
 118                                               GFP_KERNEL))
 119                 return -ENOMEM;
 120
 121         for (i = 16; i < T3_MAX_NUM_QP; i++)
 122                 if (!(i & rdev_p->qpmask))
 123                         kfifo_in(&rdev_p->rscp->qpid_fifo,
 124                                     (unsigned char *) &i, sizeof(u32));
 125         return 0;
 126 }
 127
 128 int cxio_hal_init_rhdl_resource(u32 nr_rhdl)
 129 {
 130         return cxio_init_resource_fifo(&rhdl_fifo, &rhdl_fifo_lock, nr_rhdl, 1,
 131                                        0);
 132 }
 133
 134 void cxio_hal_destroy_rhdl_resource(void)
 135 {
 136         kfifo_free(&rhdl_fifo);
 137 }
 138
 139 /* nr_* must be power of 2 */
 140 int cxio_hal_init_resource(struct cxio_rdev *rdev_p,
 141                            u32 nr_tpt, u32 nr_pbl,
 142                            u32 nr_rqt, u32 nr_qpid, u32 nr_cqid, u32 nr_pdid)
 143 {
 144         int err = 0;
 145         struct cxio_hal_resource *rscp;
 146
 147         rscp = kmalloc(sizeof(*rscp), GFP_KERNEL);
 148         if (!rscp)
 149                 return -ENOMEM;
 150         rdev_p->rscp = rscp;
 151         err = cxio_init_resource_fifo_random(&rscp->tpt_fifo,
 152                                       &rscp->tpt_fifo_lock,
 153                                       nr_tpt, 1, 0);
 154         if (err)
 155                 goto tpt_err;
 156         err = cxio_init_qpid_fifo(rdev_p);
 157         if (err)
 158                 goto qpid_err;
 159         err = cxio_init_resource_fifo(&rscp->cqid_fifo, &rscp->cqid_fifo_lock,
 160                                       nr_cqid, 1, 0);
 161         if (err)
 162                 goto cqid_err;
 163         err = cxio_init_resource_fifo(&rscp->pdid_fifo, &rscp->pdid_fifo_lock,
 164                                       nr_pdid, 1, 0);
 165         if (err)
 166                 goto pdid_err;
 167         return 0;
 168 pdid_err:
 169         kfifo_free(&rscp->cqid_fifo);
 170 cqid_err:
 171         kfifo_free(&rscp->qpid_fifo);
 172 qpid_err:
 173         kfifo_free(&rscp->tpt_fifo);
 174 tpt_err:
 175         return -ENOMEM;
 176 }
 177
 178 /*
 179  * returns 0 if no resource available
 180  */
 181 static u32 cxio_hal_get_resource(struct kfifo *fifo, spinlock_t * lock)
 182 {
 183         u32 entry;
 184         if (kfifo_out_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock))
 185                 return entry;
 186         else
 187                 return 0;       /* fifo emptry */
 188 }
 189
 190 static void cxio_hal_put_resource(struct kfifo *fifo, spinlock_t * lock,
 191                 u32 entry)
 192 {
 193         BUG_ON(
 194         kfifo_in_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock)
 195         == 0);
 196 }
 197
 198 u32 cxio_hal_get_stag(struct cxio_hal_resource *rscp)
 199 {
 200         return cxio_hal_get_resource(&rscp->tpt_fifo, &rscp->tpt_fifo_lock);
 201 }
 202
 203 void cxio_hal_put_stag(struct cxio_hal_resource *rscp, u32 stag)
 204 {
 205         cxio_hal_put_resource(&rscp->tpt_fifo, &rscp->tpt_fifo_lock, stag);
 206 }
 207
 208 u32 cxio_hal_get_qpid(struct cxio_hal_resource *rscp)
 209 {
 210         u32 qpid = cxio_hal_get_resource(&rscp->qpid_fifo,
 211                         &rscp->qpid_fifo_lock);
 212         PDBG("%s qpid 0x%x\n", __func__, qpid);
 213         return qpid;
 214 }
 215
 216 void cxio_hal_put_qpid(struct cxio_hal_resource *rscp, u32 qpid)
 217 {
 218         PDBG("%s qpid 0x%x\n", __func__, qpid);
 219         cxio_hal_put_resource(&rscp->qpid_fifo, &rscp->qpid_fifo_lock, qpid);
 220 }
 221
 222 u32 cxio_hal_get_cqid(struct cxio_hal_resource *rscp)
 223 {
 224         return cxio_hal_get_resource(&rscp->cqid_fifo, &rscp->cqid_fifo_lock);
 225 }
 226
 227 void cxio_hal_put_cqid(struct cxio_hal_resource *rscp, u32 cqid)
 228 {
 229         cxio_hal_put_resource(&rscp->cqid_fifo, &rscp->cqid_fifo_lock, cqid);
 230 }
 231
 232 u32 cxio_hal_get_pdid(struct cxio_hal_resource *rscp)
 233 {
 234         return cxio_hal_get_resource(&rscp->pdid_fifo, &rscp->pdid_fifo_lock);
 235 }
 236
 237 void cxio_hal_put_pdid(struct cxio_hal_resource *rscp, u32 pdid)
 238 {
 239         cxio_hal_put_resource(&rscp->pdid_fifo, &rscp->pdid_fifo_lock, pdid);
 240 }
 241
 242 void cxio_hal_destroy_resource(struct cxio_hal_resource *rscp)
 243 {
 244         kfifo_free(&rscp->tpt_fifo);
 245         kfifo_free(&rscp->cqid_fifo);
 246         kfifo_free(&rscp->qpid_fifo);
 247         kfifo_free(&rscp->pdid_fifo);
 248         kfree(rscp);
 249 }
 250
 251 /*
 252  * PBL Memory Manager.  Uses Linux generic allocator.
 253  */
 254
 255 #define MIN_PBL_SHIFT 8                 /* 256B == min PBL size (32 entries) */
 256
 257 u32 cxio_hal_pblpool_alloc(struct cxio_rdev *rdev_p, int size)
 258 {
 259         unsigned long addr = gen_pool_alloc(rdev_p->pbl_pool, size);
 260         PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size);
 261         return (u32)addr;
 262 }
 263
 264 void cxio_hal_pblpool_free(struct cxio_rdev *rdev_p, u32 addr, int size)
 265 {
 266         PDBG("%s addr 0x%x size %d\n", __func__, addr, size);
 267         gen_pool_free(rdev_p->pbl_pool, (unsigned long)addr, size);
 268 }
 269
 270 int cxio_hal_pblpool_create(struct cxio_rdev *rdev_p)
 271 {
 272         unsigned pbl_start, pbl_chunk;
 273
 274         rdev_p->pbl_pool = gen_pool_create(MIN_PBL_SHIFT, -1);
 275         if (!rdev_p->pbl_pool)
 276                 return -ENOMEM;
 277
 278         pbl_start = rdev_p->rnic_info.pbl_base;
 279         pbl_chunk = rdev_p->rnic_info.pbl_top - pbl_start + 1;
 280
 281         while (pbl_start < rdev_p->rnic_info.pbl_top) {
 282                 pbl_chunk = min(rdev_p->rnic_info.pbl_top - pbl_start + 1,
 283                                 pbl_chunk);
 284                 if (gen_pool_add(rdev_p->pbl_pool, pbl_start, pbl_chunk, -1)) {
 285                         PDBG("%s failed to add PBL chunk (%x/%x)\n",
 286                              __func__, pbl_start, pbl_chunk);
 287                         if (pbl_chunk <= 1024 << MIN_PBL_SHIFT) {
 288                                 printk(KERN_WARNING MOD "%s: Failed to add all PBL chunks (%x/%x)\n",
 289                                        __func__, pbl_start, rdev_p->rnic_info.pbl_top - pbl_start);
 290                                 return 0;
 291                         }
 292                         pbl_chunk >>= 1;
 293                 } else {
 294                         PDBG("%s added PBL chunk (%x/%x)\n",
 295                              __func__, pbl_start, pbl_chunk);
 296                         pbl_start += pbl_chunk;
 297                 }
 298         }
 299
 300         return 0;
 301 }
 302
 303 void cxio_hal_pblpool_destroy(struct cxio_rdev *rdev_p)
 304 {
 305         gen_pool_destroy(rdev_p->pbl_pool);
 306 }
 307
 308 /*
 309  * RQT Memory Manager.  Uses Linux generic allocator.
 310  */
 311
 312 #define MIN_RQT_SHIFT 10        /* 1KB == mini RQT size (16 entries) */
 313 #define RQT_CHUNK 2*1024*1024
 314
 315 u32 cxio_hal_rqtpool_alloc(struct cxio_rdev *rdev_p, int size)
 316 {
 317         unsigned long addr = gen_pool_alloc(rdev_p->rqt_pool, size << 6);
 318         PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size << 6);
 319         return (u32)addr;
 320 }
 321
 322 void cxio_hal_rqtpool_free(struct cxio_rdev *rdev_p, u32 addr, int size)
 323 {
 324         PDBG("%s addr 0x%x size %d\n", __func__, addr, size << 6);
 325         gen_pool_free(rdev_p->rqt_pool, (unsigned long)addr, size << 6);
 326 }
 327
 328 int cxio_hal_rqtpool_create(struct cxio_rdev *rdev_p)
 329 {
 330         unsigned long i;
 331         rdev_p->rqt_pool = gen_pool_create(MIN_RQT_SHIFT, -1);
 332         if (rdev_p->rqt_pool)
 333                 for (i = rdev_p->rnic_info.rqt_base;
 334                      i <= rdev_p->rnic_info.rqt_top - RQT_CHUNK + 1;
 335                      i += RQT_CHUNK)
 336                         gen_pool_add(rdev_p->rqt_pool, i, RQT_CHUNK, -1);
 337         return rdev_p->rqt_pool ? 0 : -ENOMEM;
 338 }
 339
 340 void cxio_hal_rqtpool_destroy(struct cxio_rdev *rdev_p)
 341 {
 342         gen_pool_destroy(rdev_p->rqt_pool);
 343 }