cregit-Linux how code gets into the kernel

Release 4.11 mm/cma_debug.c

Directory: mm
/*
 * CMA DebugFS Interface
 *
 * Copyright (c) 2015 Sasha Levin <sasha.levin@oracle.com>
 */


#include <linux/debugfs.h>
#include <linux/cma.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm_types.h>

#include "cma.h"


struct cma_mem {
	
struct hlist_node node;
	
struct page *p;
	
unsigned long n;
};


static struct dentry *cma_debugfs_root;


static int cma_debugfs_get(void *data, u64 *val) { unsigned long *p = data; *val = *p; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin30100.00%1100.00%
Total30100.00%1100.00%

DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");
static int cma_used_get(void *data, u64 *val) { struct cma *cma = data; unsigned long used; mutex_lock(&cma->lock); /* pages counter is smaller than sizeof(int) */ used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma)); mutex_unlock(&cma->lock); *val = (u64)used << cma->order_per_bit; return 0; }

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PersonTokensPropCommitsCommitProp
Dmitry Safonov7195.95%150.00%
JoonSoo Kim34.05%150.00%
Total74100.00%2100.00%

DEFINE_SIMPLE_ATTRIBUTE(cma_used_fops, cma_used_get, NULL, "%llu\n");
static int cma_maxchunk_get(void *data, u64 *val) { struct cma *cma = data; unsigned long maxchunk = 0; unsigned long start, end = 0; unsigned long bitmap_maxno = cma_bitmap_maxno(cma); mutex_lock(&cma->lock); for (;;) { start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end); if (start >= cma->count) break; end = find_next_bit(cma->bitmap, bitmap_maxno, start); maxchunk = max(end - start, maxchunk); } mutex_unlock(&cma->lock); *val = (u64)maxchunk << cma->order_per_bit; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Safonov11791.41%150.00%
JoonSoo Kim118.59%150.00%
Total128100.00%2100.00%

DEFINE_SIMPLE_ATTRIBUTE(cma_maxchunk_fops, cma_maxchunk_get, NULL, "%llu\n");
static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem) { spin_lock(&cma->mem_head_lock); hlist_add_head(&mem->node, &cma->mem_head); spin_unlock(&cma->mem_head_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin45100.00%1100.00%
Total45100.00%1100.00%


static struct cma_mem *cma_get_entry_from_list(struct cma *cma) { struct cma_mem *mem = NULL; spin_lock(&cma->mem_head_lock); if (!hlist_empty(&cma->mem_head)) { mem = hlist_entry(cma->mem_head.first, struct cma_mem, node); hlist_del_init(&mem->node); } spin_unlock(&cma->mem_head_lock); return mem; }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin76100.00%1100.00%
Total76100.00%1100.00%


static int cma_free_mem(struct cma *cma, int count) { struct cma_mem *mem = NULL; while (count) { mem = cma_get_entry_from_list(cma); if (mem == NULL) return 0; if (mem->n <= count) { cma_release(cma, mem->p, mem->n); count -= mem->n; kfree(mem); } else if (cma->order_per_bit == 0) { cma_release(cma, mem->p, count); mem->p += count; mem->n -= count; count = 0; cma_add_to_cma_mem_list(cma, mem); } else { pr_debug("cma: cannot release partial block when order_per_bit != 0\n"); cma_add_to_cma_mem_list(cma, mem); break; } } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin141100.00%1100.00%
Total141100.00%1100.00%


static int cma_free_write(void *data, u64 val) { int pages = val; struct cma *cma = data; return cma_free_mem(cma, pages); }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin33100.00%1100.00%
Total33100.00%1100.00%

DEFINE_SIMPLE_ATTRIBUTE(cma_free_fops, NULL, cma_free_write, "%llu\n");
static int cma_alloc_mem(struct cma *cma, int count) { struct cma_mem *mem; struct page *p; mem = kzalloc(sizeof(*mem), GFP_KERNEL); if (!mem) return -ENOMEM; p = cma_alloc(cma, count, 0, GFP_KERNEL); if (!p) { kfree(mem); return -ENOMEM; } mem->p = p; mem->n = count; cma_add_to_cma_mem_list(cma, mem); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin9496.91%133.33%
Lucas Stach22.06%133.33%
Andrew Morton11.03%133.33%
Total97100.00%3100.00%


static int cma_alloc_write(void *data, u64 val) { int pages = val; struct cma *cma = data; return cma_alloc_mem(cma, pages); }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin33100.00%1100.00%
Total33100.00%1100.00%

DEFINE_SIMPLE_ATTRIBUTE(cma_alloc_fops, NULL, cma_alloc_write, "%llu\n");
static void cma_debugfs_add_one(struct cma *cma, int idx) { struct dentry *tmp; char name[16]; int u32s; sprintf(name, "cma-%d", idx); tmp = debugfs_create_dir(name, cma_debugfs_root); debugfs_create_file("alloc", S_IWUSR, tmp, cma, &cma_alloc_fops); debugfs_create_file("free", S_IWUSR, tmp, cma, &cma_free_fops); debugfs_create_file("base_pfn", S_IRUGO, tmp, &cma->base_pfn, &cma_debugfs_fops); debugfs_create_file("count", S_IRUGO, tmp, &cma->count, &cma_debugfs_fops); debugfs_create_file("order_per_bit", S_IRUGO, tmp, &cma->order_per_bit, &cma_debugfs_fops); debugfs_create_file("used", S_IRUGO, tmp, cma, &cma_used_fops); debugfs_create_file("maxchunk", S_IRUGO, tmp, cma, &cma_maxchunk_fops); u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32)); debugfs_create_u32_array("bitmap", S_IRUGO, tmp, (u32*)cma->bitmap, u32s); }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin15984.13%360.00%
Dmitry Safonov2814.81%120.00%
JoonSoo Kim21.06%120.00%
Total189100.00%5100.00%


static int __init cma_debugfs_init(void) { int i; cma_debugfs_root = debugfs_create_dir("cma", NULL); if (!cma_debugfs_root) return -ENOMEM; for (i = 0; i < cma_area_count; i++) cma_debugfs_add_one(&cma_areas[i], i); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin57100.00%1100.00%
Total57100.00%1100.00%

late_initcall(cma_debugfs_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Sasha Levin75274.53%337.50%
Dmitry Safonov23823.59%112.50%
JoonSoo Kim161.59%225.00%
Lucas Stach20.20%112.50%
Andrew Morton10.10%112.50%
Total1009100.00%8100.00%
Directory: mm
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