cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/mellanox/mlx5/core/alloc.c

/*
 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/bitmap.h>
#include <linux/dma-mapping.h>
#include <linux/vmalloc.h>
#include <linux/mlx5/driver.h>

#include "mlx5_core.h"


struct mlx5_db_pgdir {
	
struct list_head	list;
	
unsigned long	       *bitmap;
	
__be32		       *db_page;
	
dma_addr_t		db_dma;
};

/* Handling for queue buffers -- we allocate a bunch of memory and
 * register it in a memory region at HCA virtual address 0.
 */


static void *mlx5_dma_zalloc_coherent_node(struct mlx5_core_dev *dev, size_t size, dma_addr_t *dma_handle, int node) { struct mlx5_priv *priv = &dev->priv; int original_node; void *cpu_handle; mutex_lock(&priv->alloc_mutex); original_node = dev_to_node(&dev->pdev->dev); set_dev_node(&dev->pdev->dev, node); cpu_handle = dma_zalloc_coherent(&dev->pdev->dev, size, dma_handle, GFP_KERNEL); set_dev_node(&dev->pdev->dev, original_node); mutex_unlock(&priv->alloc_mutex); return cpu_handle; }

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Saeed Mahameed11199.11%150.00%
Eli Cohen10.89%150.00%
Total112100.00%2100.00%


int mlx5_buf_alloc_node(struct mlx5_core_dev *dev, int size, struct mlx5_buf *buf, int node) { dma_addr_t t; buf->size = size; buf->npages = 1; buf->page_shift = (u8)get_order(size) + PAGE_SHIFT; buf->direct.buf = mlx5_dma_zalloc_coherent_node(dev, size, &t, node); if (!buf->direct.buf) return -ENOMEM; buf->direct.map = t; while (t & ((1 << buf->page_shift) - 1)) { --buf->page_shift; buf->npages *= 2; } return 0; }

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Eli Cohen11191.74%133.33%
Saeed Mahameed75.79%133.33%
Jack Morgenstein32.48%133.33%
Total121100.00%3100.00%


int mlx5_buf_alloc(struct mlx5_core_dev *dev, int size, struct mlx5_buf *buf) { return mlx5_buf_alloc_node(dev, size, buf, dev->priv.numa_node); }

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Saeed Mahameed34100.00%1100.00%
Total34100.00%1100.00%

EXPORT_SYMBOL_GPL(mlx5_buf_alloc);
void mlx5_buf_free(struct mlx5_core_dev *dev, struct mlx5_buf *buf) { dma_free_coherent(&dev->pdev->dev, buf->size, buf->direct.buf, buf->direct.map); }

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Eli Cohen41100.00%1100.00%
Total41100.00%1100.00%

EXPORT_SYMBOL_GPL(mlx5_buf_free);
int mlx5_frag_buf_alloc_node(struct mlx5_core_dev *dev, int size, struct mlx5_frag_buf *buf, int node) { int i; buf->size = size; buf->npages = 1 << get_order(size); buf->page_shift = PAGE_SHIFT; buf->frags = kcalloc(buf->npages, sizeof(struct mlx5_buf_list), GFP_KERNEL); if (!buf->frags) goto err_out; for (i = 0; i < buf->npages; i++) { struct mlx5_buf_list *frag = &buf->frags[i]; int frag_sz = min_t(int, size, PAGE_SIZE); frag->buf = mlx5_dma_zalloc_coherent_node(dev, frag_sz, &frag->map, node); if (!frag->buf) goto err_free_buf; if (frag->map & ((1 << buf->page_shift) - 1)) { dma_free_coherent(&dev->pdev->dev, frag_sz, buf->frags[i].buf, buf->frags[i].map); mlx5_core_warn(dev, "unexpected map alignment: %pad, page_shift=%d\n", &frag->map, buf->page_shift); goto err_free_buf; } size -= frag_sz; } return 0; err_free_buf: while (i--) dma_free_coherent(&dev->pdev->dev, PAGE_SIZE, buf->frags[i].buf, buf->frags[i].map); kfree(buf->frags); err_out: return -ENOMEM; }

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Tariq Toukan27099.26%150.00%
Arnd Bergmann20.74%150.00%
Total272100.00%2100.00%


void mlx5_frag_buf_free(struct mlx5_core_dev *dev, struct mlx5_frag_buf *buf) { int size = buf->size; int i; for (i = 0; i < buf->npages; i++) { int frag_sz = min_t(int, size, PAGE_SIZE); dma_free_coherent(&dev->pdev->dev, frag_sz, buf->frags[i].buf, buf->frags[i].map); size -= frag_sz; } kfree(buf->frags); }

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Tariq Toukan95100.00%1100.00%
Total95100.00%1100.00%


static struct mlx5_db_pgdir *mlx5_alloc_db_pgdir(struct mlx5_core_dev *dev, int node) { u32 db_per_page = PAGE_SIZE / cache_line_size(); struct mlx5_db_pgdir *pgdir; pgdir = kzalloc(sizeof(*pgdir), GFP_KERNEL); if (!pgdir) return NULL; pgdir->bitmap = kcalloc(BITS_TO_LONGS(db_per_page), sizeof(unsigned long), GFP_KERNEL); if (!pgdir->bitmap) { kfree(pgdir); return NULL; } bitmap_fill(pgdir->bitmap, db_per_page); pgdir->db_page = mlx5_dma_zalloc_coherent_node(dev, PAGE_SIZE, &pgdir->db_dma, node); if (!pgdir->db_page) { kfree(pgdir->bitmap); kfree(pgdir); return NULL; } return pgdir; }

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PersonTokensPropCommitsCommitProp
Eli Cohen8056.74%133.33%
Daniel Jurgens5337.59%133.33%
Saeed Mahameed85.67%133.33%
Total141100.00%3100.00%


static int mlx5_alloc_db_from_pgdir(struct mlx5_db_pgdir *pgdir, struct mlx5_db *db) { u32 db_per_page = PAGE_SIZE / cache_line_size(); int offset; int i; i = find_first_bit(pgdir->bitmap, db_per_page); if (i >= db_per_page) return -ENOMEM; __clear_bit(i, pgdir->bitmap); db->u.pgdir = pgdir; db->index = i; offset = db->index * cache_line_size(); db->db = pgdir->db_page + offset / sizeof(*pgdir->db_page); db->dma = pgdir->db_dma + offset; db->db[0] = 0; db->db[1] = 0; return 0; }

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Eli Cohen10277.27%133.33%
Saeed Mahameed1813.64%133.33%
Daniel Jurgens129.09%133.33%
Total132100.00%3100.00%


int mlx5_db_alloc_node(struct mlx5_core_dev *dev, struct mlx5_db *db, int node) { struct mlx5_db_pgdir *pgdir; int ret = 0; mutex_lock(&dev->priv.pgdir_mutex); list_for_each_entry(pgdir, &dev->priv.pgdir_list, list) if (!mlx5_alloc_db_from_pgdir(pgdir, db)) goto out; pgdir = mlx5_alloc_db_pgdir(dev, node); if (!pgdir) { ret = -ENOMEM; goto out; } list_add(&pgdir->list, &dev->priv.pgdir_list); /* This should never fail -- we just allocated an empty page: */ WARN_ON(mlx5_alloc_db_from_pgdir(pgdir, db)); out: mutex_unlock(&dev->priv.pgdir_mutex); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Eli Cohen11895.16%150.00%
Saeed Mahameed64.84%150.00%
Total124100.00%2100.00%

EXPORT_SYMBOL_GPL(mlx5_db_alloc_node);
int mlx5_db_alloc(struct mlx5_core_dev *dev, struct mlx5_db *db) { return mlx5_db_alloc_node(dev, db, dev->priv.numa_node); }

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Saeed Mahameed29100.00%1100.00%
Total29100.00%1100.00%

EXPORT_SYMBOL_GPL(mlx5_db_alloc);
void mlx5_db_free(struct mlx5_core_dev *dev, struct mlx5_db *db) { u32 db_per_page = PAGE_SIZE / cache_line_size(); mutex_lock(&dev->priv.pgdir_mutex); __set_bit(db->index, db->u.pgdir->bitmap); if (bitmap_full(db->u.pgdir->bitmap, db_per_page)) { dma_free_coherent(&(dev->pdev->dev), PAGE_SIZE, db->u.pgdir->db_page, db->u.pgdir->db_dma); list_del(&db->u.pgdir->list); kfree(db->u.pgdir->bitmap); kfree(db->u.pgdir); } mutex_unlock(&dev->priv.pgdir_mutex); }

Contributors

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Eli Cohen11785.40%150.00%
Daniel Jurgens2014.60%150.00%
Total137100.00%2100.00%

EXPORT_SYMBOL_GPL(mlx5_db_free);
void mlx5_fill_page_array(struct mlx5_buf *buf, __be64 *pas) { u64 addr; int i; for (i = 0; i < buf->npages; i++) { addr = buf->direct.map + (i << buf->page_shift); pas[i] = cpu_to_be64(addr); } }

Contributors

PersonTokensPropCommitsCommitProp
Eli Cohen63100.00%1100.00%
Total63100.00%1100.00%

EXPORT_SYMBOL_GPL(mlx5_fill_page_array);
void mlx5_fill_page_frag_array(struct mlx5_frag_buf *buf, __be64 *pas) { int i; for (i = 0; i < buf->npages; i++) pas[i] = cpu_to_be64(buf->frags[i].map); }

Contributors

PersonTokensPropCommitsCommitProp
Tariq Toukan49100.00%1100.00%
Total49100.00%1100.00%

EXPORT_SYMBOL_GPL(mlx5_fill_page_frag_array);

Overall Contributors

PersonTokensPropCommitsCommitProp
Eli Cohen68547.74%111.11%
Tariq Toukan41929.20%111.11%
Saeed Mahameed21915.26%333.33%
Daniel Jurgens1067.39%111.11%
Jack Morgenstein30.21%111.11%
Arnd Bergmann20.14%111.11%
Amir Vadai10.07%111.11%
Total1435100.00%9100.00%
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