3  * CMA DebugFS Interface
10 #include <linux/cma.h>
16 #include "cma.h"
38 	struct cma *cma = data;  in cma_used_get()  local
41 	mutex_lock(&cma->lock);  in cma_used_get()
43 	used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));  in cma_used_get()
44 	mutex_unlock(&cma->lock);  in cma_used_get()
45 	*val = (u64)used << cma->order_per_bit;  in cma_used_get()
53 	struct cma *cma = data;  in cma_maxchunk_get()  local
56 	unsigned long bitmap_maxno = cma_bitmap_maxno(cma);  in cma_maxchunk_get()
58 	mutex_lock(&cma->lock);  in cma_maxchunk_get()
60 		start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end);  in cma_maxchunk_get()
63 		end = find_next_bit(cma->bitmap, bitmap_maxno, start);  in cma_maxchunk_get()
66 	mutex_unlock(&cma->lock);  in cma_maxchunk_get()
67 	*val = (u64)maxchunk << cma->order_per_bit;  in cma_maxchunk_get()
73 static void cma_add_to_cma_mem_list(struct cma *cma, struct cma_mem *mem)  in cma_add_to_cma_mem_list()  argument
75 	spin_lock(&cma->mem_head_lock);  in cma_add_to_cma_mem_list()
76 	hlist_add_head(&mem->node, &cma->mem_head);  in cma_add_to_cma_mem_list()
77 	spin_unlock(&cma->mem_head_lock);  in cma_add_to_cma_mem_list()
80 static struct cma_mem *cma_get_entry_from_list(struct cma *cma)  in cma_get_entry_from_list()  argument
84 	spin_lock(&cma->mem_head_lock);  in cma_get_entry_from_list()
85 	if (!hlist_empty(&cma->mem_head)) {  in cma_get_entry_from_list()
86 		mem = hlist_entry(cma->mem_head.first, struct cma_mem, node);  in cma_get_entry_from_list()
89 	spin_unlock(&cma->mem_head_lock);  in cma_get_entry_from_list()
94 static int cma_free_mem(struct cma *cma, int count)  in cma_free_mem()  argument
99 		mem = cma_get_entry_from_list(cma);  in cma_free_mem()
104 			cma_release(cma, mem->p, mem->n);  in cma_free_mem()
107 		} else if (cma->order_per_bit == 0) {  in cma_free_mem()
108 			cma_release(cma, mem->p, count);  in cma_free_mem()
112 			cma_add_to_cma_mem_list(cma, mem);  in cma_free_mem()
114 			pr_debug("cma: cannot release partial block when order_per_bit != 0\n");  in cma_free_mem()
115 			cma_add_to_cma_mem_list(cma, mem);  in cma_free_mem()
127 	struct cma *cma = data;  in cma_free_write()  local
129 	return cma_free_mem(cma, pages);  in cma_free_write()
133 static int cma_alloc_mem(struct cma *cma, int count)  in cma_alloc_mem()  argument
142 	p = cma_alloc(cma, count, 0, false);  in cma_alloc_mem()
151 	cma_add_to_cma_mem_list(cma, mem);  in cma_alloc_mem()
159 	struct cma *cma = data;  in cma_alloc_write()  local
161 	return cma_alloc_mem(cma, pages);  in cma_alloc_write()
165 static void cma_debugfs_add_one(struct cma *cma, int idx)  in cma_debugfs_add_one()  argument
171 	scnprintf(name, sizeof(name), "cma-%s", cma->name);  in cma_debugfs_add_one()
175 	debugfs_create_file("alloc", 0200, tmp, cma, &cma_alloc_fops);  in cma_debugfs_add_one()
176 	debugfs_create_file("free", 0200, tmp, cma, &cma_free_fops);  in cma_debugfs_add_one()
178 			    &cma->base_pfn, &cma_debugfs_fops);  in cma_debugfs_add_one()
179 	debugfs_create_file("count", 0444, tmp, &cma->count, &cma_debugfs_fops);  in cma_debugfs_add_one()
181 			    &cma->order_per_bit, &cma_debugfs_fops);  in cma_debugfs_add_one()
182 	debugfs_create_file("used", 0444, tmp, cma, &cma_used_fops);  in cma_debugfs_add_one()
183 	debugfs_create_file("maxchunk", 0444, tmp, cma, &cma_maxchunk_fops);  in cma_debugfs_add_one()
185 	u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));  in cma_debugfs_add_one()
186 	debugfs_create_u32_array("bitmap", 0444, tmp, (u32 *)cma->bitmap, u32s);  in cma_debugfs_add_one()
193 	cma_debugfs_root = debugfs_create_dir("cma", NULL);  in cma_debugfs_init()