mlx4_icm.c

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    1 /*
    2  * Copyright (c) 2005, 2006, 2007, 2008, 2014 Mellanox Technologies. All rights reserved.
    3  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
    4  *
    5  * This software is available to you under a choice of one of two
    6  * licenses.  You may choose to be licensed under the terms of the GNU
    7  * General Public License (GPL) Version 2, available from the file
    8  * COPYING in the main directory of this source tree, or the
    9  * OpenIB.org BSD license below:
   10  *
   11  *     Redistribution and use in source and binary forms, with or
   12  *     without modification, are permitted provided that the following
   13  *     conditions are met:
   14  *
   15  *      - Redistributions of source code must retain the above
   16  *        copyright notice, this list of conditions and the following
   17  *        disclaimer.
   18  *
   19  *      - Redistributions in binary form must reproduce the above
   20  *        copyright notice, this list of conditions and the following
   21  *        disclaimer in the documentation and/or other materials
   22  *        provided with the distribution.
   23  *
   24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   31  * SOFTWARE.
   32  */
   33 
   34 #include <linux/errno.h>
   35 #include <linux/mm.h>
   36 #include <linux/scatterlist.h>
   37 #include <linux/slab.h>
   38 #include <linux/math64.h>
   39 
   40 #include <dev/mlx4/cmd.h>
   41 
   42 #include "mlx4.h"
   43 #include "icm.h"
   44 #include "fw.h"
   45 
   46 /*
   47  * We allocate in as big chunks as we can, up to a maximum of 256 KB
   48  * per chunk.
   49  */
   50 enum {
   51         MLX4_ICM_ALLOC_SIZE     = 1 << 18,
   52         MLX4_TABLE_CHUNK_SIZE   = 1 << 18
   53 };
   54 
   55 static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
   56 {
   57         int i;
   58 
   59         if (chunk->nsg > 0)
   60                 pci_unmap_sg(dev->persist->pdev, chunk->mem, chunk->npages,
   61                              PCI_DMA_BIDIRECTIONAL);
   62 
   63         for (i = 0; i < chunk->npages; ++i)
   64                 __free_pages(sg_page(&chunk->mem[i]),
   65                              get_order(chunk->mem[i].length));
   66 }
   67 
   68 static void mlx4_free_icm_coherent(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
   69 {
   70         int i;
   71 
   72         for (i = 0; i < chunk->npages; ++i)
   73                 dma_free_coherent(&dev->persist->pdev->dev,
   74                                   chunk->mem[i].length,
   75                                   lowmem_page_address(sg_page(&chunk->mem[i])),
   76                                   sg_dma_address(&chunk->mem[i]));
   77 }
   78 
   79 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent)
   80 {
   81         struct mlx4_icm_chunk *chunk, *tmp;
   82 
   83         if (!icm)
   84                 return;
   85 
   86         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
   87                 if (coherent)
   88                         mlx4_free_icm_coherent(dev, chunk);
   89                 else
   90                         mlx4_free_icm_pages(dev, chunk);
   91 
   92                 kfree(chunk);
   93         }
   94 
   95         kfree(icm);
   96 }
   97 
   98 static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order,
   99                                 gfp_t gfp_mask, int node)
  100 {
  101         struct page *page;
  102 
  103         page = alloc_pages_node(node, gfp_mask, order);
  104         if (!page) {
  105                 page = alloc_pages(gfp_mask, order);
  106                 if (!page)
  107                         return -ENOMEM;
  108         }
  109 
  110         sg_set_page(mem, page, PAGE_SIZE << order, 0);
  111         return 0;
  112 }
  113 
  114 static int mlx4_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
  115                                     int order, gfp_t gfp_mask)
  116 {
  117         void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order,
  118                                        &sg_dma_address(mem), gfp_mask);
  119         if (!buf)
  120                 return -ENOMEM;
  121 
  122         sg_set_buf(mem, buf, PAGE_SIZE << order);
  123         BUG_ON(mem->offset);
  124         sg_dma_len(mem) = PAGE_SIZE << order;
  125         return 0;
  126 }
  127 
  128 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
  129                                 gfp_t gfp_mask, int coherent)
  130 {
  131         struct mlx4_icm *icm;
  132         struct mlx4_icm_chunk *chunk = NULL;
  133         int cur_order;
  134         int ret;
  135 
  136         /* We use sg_set_buf for coherent allocs, which assumes low memory */
  137         BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
  138 
  139         icm = kmalloc_node(sizeof(*icm),
  140                            gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN),
  141                            dev->numa_node);
  142         if (!icm) {
  143                 icm = kmalloc(sizeof(*icm),
  144                               gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
  145                 if (!icm)
  146                         return NULL;
  147         }
  148 
  149         icm->refcount = 0;
  150         INIT_LIST_HEAD(&icm->chunk_list);
  151 
  152         cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
  153 
  154         while (npages > 0) {
  155                 if (!chunk) {
  156                         chunk = kmalloc_node(sizeof(*chunk),
  157                                              gfp_mask & ~(__GFP_HIGHMEM |
  158                                                           __GFP_NOWARN),
  159                                              dev->numa_node);
  160                         if (!chunk) {
  161                                 chunk = kmalloc(sizeof(*chunk),
  162                                                 gfp_mask & ~(__GFP_HIGHMEM |
  163                                                              __GFP_NOWARN));
  164                                 if (!chunk)
  165                                         goto fail;
  166                         }
  167 
  168                         sg_init_table(chunk->mem, MLX4_ICM_CHUNK_LEN);
  169                         chunk->npages = 0;
  170                         chunk->nsg    = 0;
  171                         list_add_tail(&chunk->list, &icm->chunk_list);
  172                 }
  173 
  174                 while (1 << cur_order > npages)
  175                         --cur_order;
  176 
  177                 if (coherent)
  178                         ret = mlx4_alloc_icm_coherent(&dev->persist->pdev->dev,
  179                                                       &chunk->mem[chunk->npages],
  180                                                       cur_order, gfp_mask);
  181                 else
  182                         ret = mlx4_alloc_icm_pages(&chunk->mem[chunk->npages],
  183                                                    cur_order, gfp_mask,
  184                                                    dev->numa_node);
  185 
  186                 if (ret) {
  187                         if (--cur_order < 0)
  188                                 goto fail;
  189                         else
  190                                 continue;
  191                 }
  192 
  193                 ++chunk->npages;
  194 
  195                 if (coherent)
  196                         ++chunk->nsg;
  197                 else if (chunk->npages == MLX4_ICM_CHUNK_LEN) {
  198                         chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
  199                                                 chunk->npages,
  200                                                 PCI_DMA_BIDIRECTIONAL);
  201 
  202                         if (chunk->nsg <= 0)
  203                                 goto fail;
  204                 }
  205 
  206                 if (chunk->npages == MLX4_ICM_CHUNK_LEN)
  207                         chunk = NULL;
  208 
  209                 npages -= 1 << cur_order;
  210         }
  211 
  212         if (!coherent && chunk) {
  213                 chunk->nsg = pci_map_sg(dev->persist->pdev, chunk->mem,
  214                                         chunk->npages,
  215                                         PCI_DMA_BIDIRECTIONAL);
  216 
  217                 if (chunk->nsg <= 0)
  218                         goto fail;
  219         }
  220 
  221         return icm;
  222 
  223 fail:
  224         mlx4_free_icm(dev, icm, coherent);
  225         return NULL;
  226 }
  227 
  228 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
  229 {
  230         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
  231 }
  232 
  233 static int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
  234 {
  235         return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
  236                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
  237 }
  238 
  239 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
  240 {
  241         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
  242 }
  243 
  244 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
  245 {
  246         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX,
  247                         MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
  248 }
  249 
  250 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj,
  251                    gfp_t gfp)
  252 {
  253         u32 i = (obj & (table->num_obj - 1)) /
  254                         (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
  255         int ret = 0;
  256 
  257         mutex_lock(&table->mutex);
  258 
  259         if (table->icm[i]) {
  260                 ++table->icm[i]->refcount;
  261                 goto out;
  262         }
  263 
  264         table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
  265                                        (table->lowmem ? gfp : GFP_HIGHUSER) |
  266                                        __GFP_NOWARN, table->coherent);
  267         if (!table->icm[i]) {
  268                 ret = -ENOMEM;
  269                 goto out;
  270         }
  271 
  272         if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
  273                          (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
  274                 mlx4_free_icm(dev, table->icm[i], table->coherent);
  275                 table->icm[i] = NULL;
  276                 ret = -ENOMEM;
  277                 goto out;
  278         }
  279 
  280         ++table->icm[i]->refcount;
  281 
  282 out:
  283         mutex_unlock(&table->mutex);
  284         return ret;
  285 }
  286 
  287 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
  288 {
  289         u32 i;
  290         u64 offset;
  291 
  292         i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
  293 
  294         mutex_lock(&table->mutex);
  295 
  296         if (--table->icm[i]->refcount == 0) {
  297                 offset = (u64) i * MLX4_TABLE_CHUNK_SIZE;
  298                 mlx4_UNMAP_ICM(dev, table->virt + offset,
  299                                MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
  300                 mlx4_free_icm(dev, table->icm[i], table->coherent);
  301                 table->icm[i] = NULL;
  302         }
  303 
  304         mutex_unlock(&table->mutex);
  305 }
  306 
  307 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj,
  308                         dma_addr_t *dma_handle)
  309 {
  310         int offset, dma_offset, i;
  311         u64 idx;
  312         struct mlx4_icm_chunk *chunk;
  313         struct mlx4_icm *icm;
  314         struct page *page = NULL;
  315 
  316         if (!table->lowmem)
  317                 return NULL;
  318 
  319         mutex_lock(&table->mutex);
  320 
  321         idx = (u64) (obj & (table->num_obj - 1)) * table->obj_size;
  322         icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
  323         dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
  324 
  325         if (!icm)
  326                 goto out;
  327 
  328         list_for_each_entry(chunk, &icm->chunk_list, list) {
  329                 for (i = 0; i < chunk->npages; ++i) {
  330                         if (dma_handle && dma_offset >= 0) {
  331                                 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
  332                                         *dma_handle = sg_dma_address(&chunk->mem[i]) +
  333                                                 dma_offset;
  334                                 dma_offset -= sg_dma_len(&chunk->mem[i]);
  335                         }
  336                         /*
  337                          * DMA mapping can merge pages but not split them,
  338                          * so if we found the page, dma_handle has already
  339                          * been assigned to.
  340                          */
  341                         if (chunk->mem[i].length > offset) {
  342                                 page = sg_page(&chunk->mem[i]);
  343                                 goto out;
  344                         }
  345                         offset -= chunk->mem[i].length;
  346                 }
  347         }
  348 
  349 out:
  350         mutex_unlock(&table->mutex);
  351         return page ? lowmem_page_address(page) + offset : NULL;
  352 }
  353 
  354 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  355                          u32 start, u32 end)
  356 {
  357         int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
  358         int err;
  359         u32 i;
  360 
  361         for (i = start; i <= end; i += inc) {
  362                 err = mlx4_table_get(dev, table, i, GFP_KERNEL);
  363                 if (err)
  364                         goto fail;
  365         }
  366 
  367         return 0;
  368 
  369 fail:
  370         while (i > start) {
  371                 i -= inc;
  372                 mlx4_table_put(dev, table, i);
  373         }
  374 
  375         return err;
  376 }
  377 
  378 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  379                           u32 start, u32 end)
  380 {
  381         u32 i;
  382 
  383         for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
  384                 mlx4_table_put(dev, table, i);
  385 }
  386 
  387 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  388                         u64 virt, int obj_size, u32 nobj, int reserved,
  389                         int use_lowmem, int use_coherent)
  390 {
  391         int obj_per_chunk;
  392         int num_icm;
  393         unsigned chunk_size;
  394         int i;
  395         u64 size;
  396 
  397         obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
  398         num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
  399 
  400         table->icm      = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
  401         if (!table->icm)
  402                 return -ENOMEM;
  403         table->virt     = virt;
  404         table->num_icm  = num_icm;
  405         table->num_obj  = nobj;
  406         table->obj_size = obj_size;
  407         table->lowmem   = use_lowmem;
  408         table->coherent = use_coherent;
  409         mutex_init(&table->mutex);
  410 
  411         size = (u64) nobj * obj_size;
  412         for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
  413                 chunk_size = MLX4_TABLE_CHUNK_SIZE;
  414                 if ((u64) (i + 1) * MLX4_TABLE_CHUNK_SIZE > size)
  415                         chunk_size = PAGE_ALIGN(size -
  416                                         i * MLX4_TABLE_CHUNK_SIZE);
  417 
  418                 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
  419                                                (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
  420                                                __GFP_NOWARN, use_coherent);
  421                 if (!table->icm[i])
  422                         goto err;
  423                 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
  424                         mlx4_free_icm(dev, table->icm[i], use_coherent);
  425                         table->icm[i] = NULL;
  426                         goto err;
  427                 }
  428 
  429                 /*
  430                  * Add a reference to this ICM chunk so that it never
  431                  * gets freed (since it contains reserved firmware objects).
  432                  */
  433                 ++table->icm[i]->refcount;
  434         }
  435 
  436         return 0;
  437 
  438 err:
  439         for (i = 0; i < num_icm; ++i)
  440                 if (table->icm[i]) {
  441                         mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
  442                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
  443                         mlx4_free_icm(dev, table->icm[i], use_coherent);
  444                 }
  445 
  446         kfree(table->icm);
  447 
  448         return -ENOMEM;
  449 }
  450 
  451 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
  452 {
  453         int i;
  454 
  455         for (i = 0; i < table->num_icm; ++i)
  456                 if (table->icm[i]) {
  457                         mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
  458                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
  459                         mlx4_free_icm(dev, table->icm[i], table->coherent);
  460                 }
  461 
  462         kfree(table->icm);
  463 }
Cache object: fda227280709bcc00db4aba8faf2fbe3
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FreeBSD/Linux Kernel Cross Reference sys/dev/mlx4/mlx4_core/mlx4_icm.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx4/mlx4_core/mlx4_icm.c
