58 static void vmcp_response_alloc(struct vmcp_session *session)  in vmcp_response_alloc()  argument
63 	order = get_order(session->bufsize);  in vmcp_response_alloc()
64 	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;  in vmcp_response_alloc()
73 		session->response = (char *)page_to_phys(page);  in vmcp_response_alloc()
74 		session->cma_alloc = 1;  in vmcp_response_alloc()
77 	session->response = (char *)__get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, order);  in vmcp_response_alloc()
80 static void vmcp_response_free(struct vmcp_session *session)  in vmcp_response_free()  argument
85 	if (!session->response)  in vmcp_response_free()
87 	order = get_order(session->bufsize);  in vmcp_response_free()
88 	nr_pages = ALIGN(session->bufsize, PAGE_SIZE) >> PAGE_SHIFT;  in vmcp_response_free()
89 	if (session->cma_alloc) {  in vmcp_response_free()
90 		page = phys_to_page((unsigned long)session->response);  in vmcp_response_free()
92 		session->cma_alloc = 0;  in vmcp_response_free()
94 		free_pages((unsigned long)session->response, order);  in vmcp_response_free()
96 	session->response = NULL;  in vmcp_response_free()
101 	struct vmcp_session *session;  in vmcp_open()  local
106 	session = kmalloc(sizeof(*session), GFP_KERNEL);  in vmcp_open()
107 	if (!session)  in vmcp_open()
110 	session->bufsize = PAGE_SIZE;  in vmcp_open()
111 	session->response = NULL;  in vmcp_open()
112 	session->resp_size = 0;  in vmcp_open()
113 	mutex_init(&session->mutex);  in vmcp_open()
114 	file->private_data = session;  in vmcp_open()
120 	struct vmcp_session *session;  in vmcp_release()  local
122 	session = file->private_data;  in vmcp_release()
124 	vmcp_response_free(session);  in vmcp_release()
125 	kfree(session);  in vmcp_release()
134 	struct vmcp_session *session;  in vmcp_read()  local
136 	session = file->private_data;  in vmcp_read()
137 	if (mutex_lock_interruptible(&session->mutex))  in vmcp_read()
139 	if (!session->response) {  in vmcp_read()
140 		mutex_unlock(&session->mutex);  in vmcp_read()
143 	size = min_t(size_t, session->resp_size, session->bufsize);  in vmcp_read()
145 					session->response, size);  in vmcp_read()
147 	mutex_unlock(&session->mutex);  in vmcp_read()
157 	struct vmcp_session *session;  in vmcp_write()  local
164 	session = file->private_data;  in vmcp_write()
165 	if (mutex_lock_interruptible(&session->mutex)) {  in vmcp_write()
169 	if (!session->response)  in vmcp_write()
170 		vmcp_response_alloc(session);  in vmcp_write()
171 	if (!session->response) {  in vmcp_write()
172 		mutex_unlock(&session->mutex);  in vmcp_write()
177 	session->resp_size = cpcmd(cmd, session->response, session->bufsize,  in vmcp_write()
178 				   &session->resp_code);  in vmcp_write()
179 	mutex_unlock(&session->mutex);  in vmcp_write()
200 	struct vmcp_session *session;  in vmcp_ioctl()  local
204 	session = file->private_data;  in vmcp_ioctl()
209 	if (mutex_lock_interruptible(&session->mutex))  in vmcp_ioctl()
213 		ret = put_user(session->resp_code, argp);  in vmcp_ioctl()
216 		vmcp_response_free(session);  in vmcp_ioctl()
217 		ret = get_user(session->bufsize, argp);  in vmcp_ioctl()
219 			session->bufsize = PAGE_SIZE;  in vmcp_ioctl()
220 		if (!session->bufsize || get_order(session->bufsize) > 8) {  in vmcp_ioctl()
221 			session->bufsize = PAGE_SIZE;  in vmcp_ioctl()
226 		ret = put_user(session->resp_size, argp);  in vmcp_ioctl()
231 	mutex_unlock(&session->mutex);  in vmcp_ioctl()