1 // SPDX-License-Identifier: GPL-2.0-or-later
46 static void zcomp_strm_free(struct zcomp *comp, struct zcomp_strm *zstrm)  in zcomp_strm_free()  argument
48 	comp->ops->destroy_ctx(&zstrm->ctx);  in zcomp_strm_free()
49 	vfree(zstrm->buffer);  in zcomp_strm_free()
50 	zstrm->buffer = NULL;  in zcomp_strm_free()
53 static int zcomp_strm_init(struct zcomp *comp, struct zcomp_strm *zstrm)  in zcomp_strm_init()  argument
55 	int ret;  in zcomp_strm_init()
57 	ret = comp->ops->create_ctx(comp->params, &zstrm->ctx);  in zcomp_strm_init()
65 	zstrm->buffer = vzalloc(2 * PAGE_SIZE);  in zcomp_strm_init()
66 	if (!zstrm->buffer) {  in zcomp_strm_init()
67 		zcomp_strm_free(comp, zstrm);  in zcomp_strm_init()
68 		return -ENOMEM;  in zcomp_strm_init()
73 static const struct zcomp_ops *lookup_backend_ops(const char *comp)  in lookup_backend_ops()  argument
75 	int i = 0;  in lookup_backend_ops()
78 		if (sysfs_streq(comp, backends[i]->name))  in lookup_backend_ops()
85 bool zcomp_available_algorithm(const char *comp)  in zcomp_available_algorithm()  argument
87 	return lookup_backend_ops(comp) != NULL;  in zcomp_available_algorithm()
91 ssize_t zcomp_available_show(const char *comp, char *buf)  in zcomp_available_show()  argument
94 	int i;  in zcomp_available_show()
96 	for (i = 0; i < ARRAY_SIZE(backends) - 1; i++) {  in zcomp_available_show()
97 		if (!strcmp(comp, backends[i]->name)) {  in zcomp_available_show()
98 			sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,  in zcomp_available_show()
99 					"[%s] ", backends[i]->name);  in zcomp_available_show()
101 			sz += scnprintf(buf + sz, PAGE_SIZE - sz - 2,  in zcomp_available_show()
102 					"%s ", backends[i]->name);  in zcomp_available_show()
106 	sz += scnprintf(buf + sz, PAGE_SIZE - sz, "\n");  in zcomp_available_show()
110 struct zcomp_strm *zcomp_stream_get(struct zcomp *comp)  in zcomp_stream_get()  argument
112 	local_lock(&comp->stream->lock);  in zcomp_stream_get()
113 	return this_cpu_ptr(comp->stream);  in zcomp_stream_get()
116 void zcomp_stream_put(struct zcomp *comp)  in zcomp_stream_put()  argument
118 	local_unlock(&comp->stream->lock);  in zcomp_stream_put()
121 int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,  in zcomp_compress()  argument
122 		   const void *src, unsigned int *dst_len)  in zcomp_compress()
126 		.dst = zstrm->buffer,  in zcomp_compress()
130 	int ret;  in zcomp_compress()
132 	ret = comp->ops->compress(comp->params, &zstrm->ctx, &req);  in zcomp_compress()
138 int zcomp_decompress(struct zcomp *comp, struct zcomp_strm *zstrm,  in zcomp_decompress()  argument
139 		     const void *src, unsigned int src_len, void *dst)  in zcomp_decompress()
148 	return comp->ops->decompress(comp->params, &zstrm->ctx, &req);  in zcomp_decompress()
151 int zcomp_cpu_up_prepare(unsigned int cpu, struct hlist_node *node)  in zcomp_cpu_up_prepare()
153 	struct zcomp *comp = hlist_entry(node, struct zcomp, node);  in zcomp_cpu_up_prepare()  local
155 	int ret;  in zcomp_cpu_up_prepare()
157 	zstrm = per_cpu_ptr(comp->stream, cpu);  in zcomp_cpu_up_prepare()
158 	local_lock_init(&zstrm->lock);  in zcomp_cpu_up_prepare()
160 	ret = zcomp_strm_init(comp, zstrm);  in zcomp_cpu_up_prepare()
166 int zcomp_cpu_dead(unsigned int cpu, struct hlist_node *node)  in zcomp_cpu_dead()
168 	struct zcomp *comp = hlist_entry(node, struct zcomp, node);  in zcomp_cpu_dead()  local
171 	zstrm = per_cpu_ptr(comp->stream, cpu);  in zcomp_cpu_dead()
172 	zcomp_strm_free(comp, zstrm);  in zcomp_cpu_dead()
176 static int zcomp_init(struct zcomp *comp, struct zcomp_params *params)  in zcomp_init()  argument
178 	int ret;  in zcomp_init()
180 	comp->stream = alloc_percpu(struct zcomp_strm);  in zcomp_init()
181 	if (!comp->stream)  in zcomp_init()
182 		return -ENOMEM;  in zcomp_init()
184 	comp->params = params;  in zcomp_init()
185 	ret = comp->ops->setup_params(comp->params);  in zcomp_init()
189 	ret = cpuhp_state_add_instance(CPUHP_ZCOMP_PREPARE, &comp->node);  in zcomp_init()
196 	comp->ops->release_params(comp->params);  in zcomp_init()
197 	free_percpu(comp->stream);  in zcomp_init()
201 void zcomp_destroy(struct zcomp *comp)  in zcomp_destroy()  argument
203 	cpuhp_state_remove_instance(CPUHP_ZCOMP_PREPARE, &comp->node);  in zcomp_destroy()
204 	comp->ops->release_params(comp->params);  in zcomp_destroy()
205 	free_percpu(comp->stream);  in zcomp_destroy()
206 	kfree(comp);  in zcomp_destroy()
211 	struct zcomp *comp;  in zcomp_create()  local
212 	int error;  in zcomp_create()
222 	comp = kzalloc(sizeof(struct zcomp), GFP_KERNEL);  in zcomp_create()
223 	if (!comp)  in zcomp_create()
224 		return ERR_PTR(-ENOMEM);  in zcomp_create()
226 	comp->ops = lookup_backend_ops(alg);  in zcomp_create()
227 	if (!comp->ops) {  in zcomp_create()
228 		kfree(comp);  in zcomp_create()
229 		return ERR_PTR(-EINVAL);  in zcomp_create()
232 	error = zcomp_init(comp, params);  in zcomp_create()
234 		kfree(comp);  in zcomp_create()
237 	return comp;  in zcomp_create()