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path: root/drivers/s390/scsi/zfcp_cfdc.c
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Diffstat (limited to 'drivers/s390/scsi/zfcp_cfdc.c')
-rw-r--r--drivers/s390/scsi/zfcp_cfdc.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/drivers/s390/scsi/zfcp_cfdc.c b/drivers/s390/scsi/zfcp_cfdc.c
new file mode 100644
index 000000000000..ec2abceca6dc
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_cfdc.c
@@ -0,0 +1,259 @@
+/*
+ * zfcp device driver
+ *
+ * Userspace interface for accessing the
+ * Access Control Lists / Control File Data Channel
+ *
+ * Copyright IBM Corporation 2008
+ */
+
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <asm/ccwdev.h>
+#include "zfcp_def.h"
+#include "zfcp_ext.h"
+#include "zfcp_fsf.h"
+
+#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
+#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
+#define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
+#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
+#define ZFCP_CFDC_CMND_UPLOAD 0x00010002
+
+#define ZFCP_CFDC_DOWNLOAD 0x00000001
+#define ZFCP_CFDC_UPLOAD 0x00000002
+#define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
+
+#define ZFCP_CFDC_IOC_MAGIC 0xDD
+#define ZFCP_CFDC_IOC \
+ _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
+
+/**
+ * struct zfcp_cfdc_data - data for ioctl cfdc interface
+ * @signature: request signature
+ * @devno: FCP adapter device number
+ * @command: command code
+ * @fsf_status: returns status of FSF command to userspace
+ * @fsf_status_qual: returned to userspace
+ * @payloads: access conflicts list
+ * @control_file: access control table
+ */
+struct zfcp_cfdc_data {
+ u32 signature;
+ u32 devno;
+ u32 command;
+ u32 fsf_status;
+ u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
+ u8 payloads[256];
+ u8 control_file[0];
+};
+
+static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
+ void __user *user_buffer)
+{
+ unsigned int length;
+ unsigned int size = ZFCP_CFDC_MAX_SIZE;
+
+ while (size) {
+ length = min((unsigned int)size, sg->length);
+ if (copy_from_user(sg_virt(sg++), user_buffer, length))
+ return -EFAULT;
+ user_buffer += length;
+ size -= length;
+ }
+ return 0;
+}
+
+static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
+ struct scatterlist *sg)
+{
+ unsigned int length;
+ unsigned int size = ZFCP_CFDC_MAX_SIZE;
+
+ while (size) {
+ length = min((unsigned int) size, sg->length);
+ if (copy_to_user(user_buffer, sg_virt(sg++), length))
+ return -EFAULT;
+ user_buffer += length;
+ size -= length;
+ }
+ return 0;
+}
+
+static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
+{
+ struct zfcp_adapter *adapter = NULL, *cur_adapter;
+ struct ccw_dev_id dev_id;
+
+ read_lock_irq(&zfcp_data.config_lock);
+ list_for_each_entry(cur_adapter, &zfcp_data.adapter_list_head, list) {
+ ccw_device_get_id(cur_adapter->ccw_device, &dev_id);
+ if (dev_id.devno == devno) {
+ adapter = cur_adapter;
+ zfcp_adapter_get(adapter);
+ break;
+ }
+ }
+ read_unlock_irq(&zfcp_data.config_lock);
+ return adapter;
+}
+
+static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
+{
+ switch (command) {
+ case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
+ fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+ fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
+ break;
+ case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
+ fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+ fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
+ break;
+ case ZFCP_CFDC_CMND_FULL_ACCESS:
+ fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+ fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
+ break;
+ case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
+ fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
+ fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
+ break;
+ case ZFCP_CFDC_CMND_UPLOAD:
+ fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
+ fsf_cfdc->option = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
+ u8 __user *control_file)
+{
+ int retval;
+ retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
+ if (retval)
+ return retval;
+
+ sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
+
+ if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
+ command & ZFCP_CFDC_DOWNLOAD) {
+ retval = zfcp_cfdc_copy_from_user(sg, control_file);
+ if (retval) {
+ zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
+ return -EFAULT;
+ }
+ }
+
+ return 0;
+}
+
+static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
+ struct zfcp_fsf_req *req)
+{
+ data->fsf_status = req->qtcb->header.fsf_status;
+ memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
+ sizeof(union fsf_status_qual));
+ memcpy(&data->payloads, &req->qtcb->bottom.support.els,
+ sizeof(req->qtcb->bottom.support.els));
+}
+
+static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
+ unsigned long buffer)
+{
+ struct zfcp_cfdc_data *data;
+ struct zfcp_cfdc_data __user *data_user;
+ struct zfcp_adapter *adapter;
+ struct zfcp_fsf_req *req;
+ struct zfcp_fsf_cfdc *fsf_cfdc;
+ int retval;
+
+ if (command != ZFCP_CFDC_IOC)
+ return -ENOTTY;
+
+ data_user = (void __user *) buffer;
+ if (!data_user)
+ return -EINVAL;
+
+ fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
+ if (!fsf_cfdc)
+ return -ENOMEM;
+
+ data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
+ if (!data) {
+ retval = -ENOMEM;
+ goto no_mem_sense;
+ }
+
+ retval = copy_from_user(data, data_user, sizeof(*data));
+ if (retval) {
+ retval = -EFAULT;
+ goto free_buffer;
+ }
+
+ if (data->signature != 0xCFDCACDF) {
+ retval = -EINVAL;
+ goto free_buffer;
+ }
+
+ retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);
+
+ adapter = zfcp_cfdc_get_adapter(data->devno);
+ if (!adapter) {
+ retval = -ENXIO;
+ goto free_buffer;
+ }
+
+ retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
+ data_user->control_file);
+ if (retval)
+ goto adapter_put;
+ req = zfcp_fsf_control_file(adapter, fsf_cfdc);
+ if (IS_ERR(req)) {
+ retval = PTR_ERR(req);
+ goto free_sg;
+ }
+
+ if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
+ retval = -ENXIO;
+ goto free_fsf;
+ }
+
+ zfcp_cfdc_req_to_sense(data, req);
+ retval = copy_to_user(data_user, data, sizeof(*data_user));
+ if (retval) {
+ retval = -EFAULT;
+ goto free_fsf;
+ }
+
+ if (data->command & ZFCP_CFDC_UPLOAD)
+ retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
+ fsf_cfdc->sg);
+
+ free_fsf:
+ zfcp_fsf_req_free(req);
+ free_sg:
+ zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
+ adapter_put:
+ zfcp_adapter_put(adapter);
+ free_buffer:
+ kfree(data);
+ no_mem_sense:
+ kfree(fsf_cfdc);
+ return retval;
+}
+
+static const struct file_operations zfcp_cfdc_fops = {
+ .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = zfcp_cfdc_dev_ioctl
+#endif
+};
+
+struct miscdevice zfcp_cfdc_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "zfcp_cfdc",
+ .fops = &zfcp_cfdc_fops,
+};