4 * Userspace interface for accessing the
5 * Access Control Lists / Control File Data Channel
7 * Copyright IBM Corporation 2008, 2009
10 #define KMSG_COMPONENT "zfcp"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/types.h>
14 #include <linux/miscdevice.h>
15 #include <asm/ccwdev.h>
20 #define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
21 #define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
22 #define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
23 #define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
24 #define ZFCP_CFDC_CMND_UPLOAD 0x00010002
26 #define ZFCP_CFDC_DOWNLOAD 0x00000001
27 #define ZFCP_CFDC_UPLOAD 0x00000002
28 #define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
30 #define ZFCP_CFDC_IOC_MAGIC 0xDD
31 #define ZFCP_CFDC_IOC \
32 _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
35 * struct zfcp_cfdc_data - data for ioctl cfdc interface
36 * @signature: request signature
37 * @devno: FCP adapter device number
38 * @command: command code
39 * @fsf_status: returns status of FSF command to userspace
40 * @fsf_status_qual: returned to userspace
41 * @payloads: access conflicts list
42 * @control_file: access control table
44 struct zfcp_cfdc_data {
49 u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
54 static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
55 void __user *user_buffer)
58 unsigned int size = ZFCP_CFDC_MAX_SIZE;
61 length = min((unsigned int)size, sg->length);
62 if (copy_from_user(sg_virt(sg++), user_buffer, length))
64 user_buffer += length;
70 static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
71 struct scatterlist *sg)
74 unsigned int size = ZFCP_CFDC_MAX_SIZE;
77 length = min((unsigned int) size, sg->length);
78 if (copy_to_user(user_buffer, sg_virt(sg++), length))
80 user_buffer += length;
86 static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
89 struct ccw_device *ccwdev;
90 struct zfcp_adapter *adapter = NULL;
92 snprintf(busid, sizeof(busid), "0.0.%04x", devno);
93 ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
97 adapter = dev_get_drvdata(&ccwdev->dev);
101 zfcp_adapter_get(adapter);
103 put_device(&ccwdev->dev);
108 static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
111 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
112 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
113 fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
115 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
116 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
117 fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
119 case ZFCP_CFDC_CMND_FULL_ACCESS:
120 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
121 fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
123 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
124 fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
125 fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
127 case ZFCP_CFDC_CMND_UPLOAD:
128 fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
129 fsf_cfdc->option = 0;
138 static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
139 u8 __user *control_file)
142 retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
146 sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
148 if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
149 command & ZFCP_CFDC_DOWNLOAD) {
150 retval = zfcp_cfdc_copy_from_user(sg, control_file);
152 zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
160 static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
161 struct zfcp_fsf_req *req)
163 data->fsf_status = req->qtcb->header.fsf_status;
164 memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
165 sizeof(union fsf_status_qual));
166 memcpy(&data->payloads, &req->qtcb->bottom.support.els,
167 sizeof(req->qtcb->bottom.support.els));
170 static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
171 unsigned long buffer)
173 struct zfcp_cfdc_data *data;
174 struct zfcp_cfdc_data __user *data_user;
175 struct zfcp_adapter *adapter;
176 struct zfcp_fsf_req *req;
177 struct zfcp_fsf_cfdc *fsf_cfdc;
180 if (command != ZFCP_CFDC_IOC)
183 data_user = (void __user *) buffer;
187 fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
191 data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
197 retval = copy_from_user(data, data_user, sizeof(*data));
203 if (data->signature != 0xCFDCACDF) {
208 retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);
210 adapter = zfcp_cfdc_get_adapter(data->devno);
215 zfcp_adapter_get(adapter);
217 retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
218 data_user->control_file);
221 req = zfcp_fsf_control_file(adapter, fsf_cfdc);
223 retval = PTR_ERR(req);
227 if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
232 zfcp_cfdc_req_to_sense(data, req);
233 retval = copy_to_user(data_user, data, sizeof(*data_user));
239 if (data->command & ZFCP_CFDC_UPLOAD)
240 retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
244 zfcp_fsf_req_free(req);
246 zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
248 zfcp_adapter_put(adapter);
256 static const struct file_operations zfcp_cfdc_fops = {
257 .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
259 .compat_ioctl = zfcp_cfdc_dev_ioctl
263 struct miscdevice zfcp_cfdc_misc = {
264 .minor = MISC_DYNAMIC_MINOR,
266 .fops = &zfcp_cfdc_fops,