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![zhong jiang](/assets/img/avatar_default.png)
It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file operation rather than DEFINE_SIMPLE_ATTRIBUTE. Link: http://lkml.kernel.org/r/1572348687-9951-1-git-send-email-zhongjiang@huawei.com Signed-off-by: zhong jiang <zhongjiang@huawei.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Yue Hu <huyue2@yulong.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
199 lines
4.5 KiB
C
199 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* CMA DebugFS Interface
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*
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* Copyright (c) 2015 Sasha Levin <sasha.levin@oracle.com>
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*/
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#include <linux/debugfs.h>
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#include <linux/cma.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/mm_types.h>
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#include "cma.h"
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struct cma_mem {
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struct hlist_node node;
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struct page *p;
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unsigned long n;
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};
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static int cma_debugfs_get(void *data, u64 *val)
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{
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unsigned long *p = data;
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*val = *p;
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");
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static int cma_used_get(void *data, u64 *val)
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{
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struct cma *cma = data;
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unsigned long used;
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mutex_lock(&cma->lock);
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/* pages counter is smaller than sizeof(int) */
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used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
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mutex_unlock(&cma->lock);
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*val = (u64)used << cma->order_per_bit;
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(cma_used_fops, cma_used_get, NULL, "%llu\n");
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static int cma_maxchunk_get(void *data, u64 *val)
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{
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struct cma *cma = data;
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unsigned long maxchunk = 0;
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unsigned long start, end = 0;
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unsigned long bitmap_maxno = cma_bitmap_maxno(cma);
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mutex_lock(&cma->lock);
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for (;;) {
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start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end);
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if (start >= bitmap_maxno)
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break;
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end = find_next_bit(cma->bitmap, bitmap_maxno, start);
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maxchunk = max(end - start, maxchunk);
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}
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mutex_unlock(&cma->lock);
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*val = (u64)maxchunk << cma->order_per_bit;
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(cma_maxchunk_fops, cma_maxchunk_get, NULL, "%llu\n");
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static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem)
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{
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spin_lock(&cma->mem_head_lock);
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hlist_add_head(&mem->node, &cma->mem_head);
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spin_unlock(&cma->mem_head_lock);
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}
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static struct cma_mem *cma_get_entry_from_list(struct cma *cma)
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{
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struct cma_mem *mem = NULL;
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spin_lock(&cma->mem_head_lock);
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if (!hlist_empty(&cma->mem_head)) {
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mem = hlist_entry(cma->mem_head.first, struct cma_mem, node);
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hlist_del_init(&mem->node);
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}
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spin_unlock(&cma->mem_head_lock);
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return mem;
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}
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static int cma_free_mem(struct cma *cma, int count)
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{
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struct cma_mem *mem = NULL;
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while (count) {
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mem = cma_get_entry_from_list(cma);
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if (mem == NULL)
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return 0;
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if (mem->n <= count) {
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cma_release(cma, mem->p, mem->n);
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count -= mem->n;
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kfree(mem);
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} else if (cma->order_per_bit == 0) {
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cma_release(cma, mem->p, count);
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mem->p += count;
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mem->n -= count;
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count = 0;
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cma_add_to_cma_mem_list(cma, mem);
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} else {
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pr_debug("cma: cannot release partial block when order_per_bit != 0\n");
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cma_add_to_cma_mem_list(cma, mem);
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break;
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}
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}
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return 0;
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}
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static int cma_free_write(void *data, u64 val)
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{
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int pages = val;
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struct cma *cma = data;
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return cma_free_mem(cma, pages);
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}
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DEFINE_DEBUGFS_ATTRIBUTE(cma_free_fops, NULL, cma_free_write, "%llu\n");
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static int cma_alloc_mem(struct cma *cma, int count)
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{
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struct cma_mem *mem;
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struct page *p;
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mem = kzalloc(sizeof(*mem), GFP_KERNEL);
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if (!mem)
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return -ENOMEM;
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p = cma_alloc(cma, count, 0, false);
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if (!p) {
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kfree(mem);
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return -ENOMEM;
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}
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mem->p = p;
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mem->n = count;
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cma_add_to_cma_mem_list(cma, mem);
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return 0;
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}
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static int cma_alloc_write(void *data, u64 val)
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{
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int pages = val;
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struct cma *cma = data;
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return cma_alloc_mem(cma, pages);
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}
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DEFINE_DEBUGFS_ATTRIBUTE(cma_alloc_fops, NULL, cma_alloc_write, "%llu\n");
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static void cma_debugfs_add_one(struct cma *cma, struct dentry *root_dentry)
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{
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struct dentry *tmp;
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char name[16];
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int u32s;
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scnprintf(name, sizeof(name), "cma-%s", cma->name);
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tmp = debugfs_create_dir(name, root_dentry);
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debugfs_create_file("alloc", 0200, tmp, cma, &cma_alloc_fops);
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debugfs_create_file("free", 0200, tmp, cma, &cma_free_fops);
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debugfs_create_file("base_pfn", 0444, tmp,
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&cma->base_pfn, &cma_debugfs_fops);
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debugfs_create_file("count", 0444, tmp, &cma->count, &cma_debugfs_fops);
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debugfs_create_file("order_per_bit", 0444, tmp,
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&cma->order_per_bit, &cma_debugfs_fops);
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debugfs_create_file("used", 0444, tmp, cma, &cma_used_fops);
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debugfs_create_file("maxchunk", 0444, tmp, cma, &cma_maxchunk_fops);
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u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));
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debugfs_create_u32_array("bitmap", 0444, tmp, (u32 *)cma->bitmap, u32s);
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}
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static int __init cma_debugfs_init(void)
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{
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struct dentry *cma_debugfs_root;
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int i;
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cma_debugfs_root = debugfs_create_dir("cma", NULL);
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for (i = 0; i < cma_area_count; i++)
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cma_debugfs_add_one(&cma_areas[i], cma_debugfs_root);
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return 0;
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}
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late_initcall(cma_debugfs_init);
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