268 lines
6.3 KiB
C
268 lines
6.3 KiB
C
/*
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* zfcp device driver
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*
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* Userspace interface for accessing the
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* Access Control Lists / Control File Data Channel
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*
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* Copyright IBM Corporation 2008, 2009
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*/
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#define KMSG_COMPONENT "zfcp"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <asm/ccwdev.h>
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#include "zfcp_def.h"
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#include "zfcp_ext.h"
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#include "zfcp_fsf.h"
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#define ZFCP_CFDC_CMND_DOWNLOAD_NORMAL 0x00010001
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#define ZFCP_CFDC_CMND_DOWNLOAD_FORCE 0x00010101
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#define ZFCP_CFDC_CMND_FULL_ACCESS 0x00000201
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#define ZFCP_CFDC_CMND_RESTRICTED_ACCESS 0x00000401
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#define ZFCP_CFDC_CMND_UPLOAD 0x00010002
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#define ZFCP_CFDC_DOWNLOAD 0x00000001
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#define ZFCP_CFDC_UPLOAD 0x00000002
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#define ZFCP_CFDC_WITH_CONTROL_FILE 0x00010000
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#define ZFCP_CFDC_IOC_MAGIC 0xDD
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#define ZFCP_CFDC_IOC \
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_IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_data)
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/**
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* struct zfcp_cfdc_data - data for ioctl cfdc interface
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* @signature: request signature
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* @devno: FCP adapter device number
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* @command: command code
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* @fsf_status: returns status of FSF command to userspace
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* @fsf_status_qual: returned to userspace
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* @payloads: access conflicts list
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* @control_file: access control table
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*/
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struct zfcp_cfdc_data {
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u32 signature;
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u32 devno;
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u32 command;
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u32 fsf_status;
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u8 fsf_status_qual[FSF_STATUS_QUALIFIER_SIZE];
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u8 payloads[256];
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u8 control_file[0];
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};
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static int zfcp_cfdc_copy_from_user(struct scatterlist *sg,
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void __user *user_buffer)
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{
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unsigned int length;
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unsigned int size = ZFCP_CFDC_MAX_SIZE;
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while (size) {
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length = min((unsigned int)size, sg->length);
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if (copy_from_user(sg_virt(sg++), user_buffer, length))
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return -EFAULT;
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user_buffer += length;
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size -= length;
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}
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return 0;
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}
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static int zfcp_cfdc_copy_to_user(void __user *user_buffer,
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struct scatterlist *sg)
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{
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unsigned int length;
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unsigned int size = ZFCP_CFDC_MAX_SIZE;
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while (size) {
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length = min((unsigned int) size, sg->length);
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if (copy_to_user(user_buffer, sg_virt(sg++), length))
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return -EFAULT;
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user_buffer += length;
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size -= length;
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}
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return 0;
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}
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static struct zfcp_adapter *zfcp_cfdc_get_adapter(u32 devno)
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{
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char busid[9];
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struct ccw_device *ccwdev;
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struct zfcp_adapter *adapter = NULL;
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snprintf(busid, sizeof(busid), "0.0.%04x", devno);
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ccwdev = get_ccwdev_by_busid(&zfcp_ccw_driver, busid);
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if (!ccwdev)
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goto out;
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adapter = dev_get_drvdata(&ccwdev->dev);
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if (!adapter)
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goto out_put;
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zfcp_adapter_get(adapter);
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out_put:
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put_device(&ccwdev->dev);
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out:
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return adapter;
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}
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static int zfcp_cfdc_set_fsf(struct zfcp_fsf_cfdc *fsf_cfdc, int command)
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{
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switch (command) {
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case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_NORMAL_MODE;
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break;
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case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_FORCE;
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break;
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case ZFCP_CFDC_CMND_FULL_ACCESS:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_FULL_ACCESS;
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break;
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case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
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fsf_cfdc->command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
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fsf_cfdc->option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
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break;
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case ZFCP_CFDC_CMND_UPLOAD:
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fsf_cfdc->command = FSF_QTCB_UPLOAD_CONTROL_FILE;
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fsf_cfdc->option = 0;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int zfcp_cfdc_sg_setup(int command, struct scatterlist *sg,
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u8 __user *control_file)
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{
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int retval;
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retval = zfcp_sg_setup_table(sg, ZFCP_CFDC_PAGES);
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if (retval)
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return retval;
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sg[ZFCP_CFDC_PAGES - 1].length = ZFCP_CFDC_MAX_SIZE % PAGE_SIZE;
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if (command & ZFCP_CFDC_WITH_CONTROL_FILE &&
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command & ZFCP_CFDC_DOWNLOAD) {
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retval = zfcp_cfdc_copy_from_user(sg, control_file);
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if (retval) {
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zfcp_sg_free_table(sg, ZFCP_CFDC_PAGES);
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return -EFAULT;
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}
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}
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return 0;
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}
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static void zfcp_cfdc_req_to_sense(struct zfcp_cfdc_data *data,
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struct zfcp_fsf_req *req)
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{
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data->fsf_status = req->qtcb->header.fsf_status;
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memcpy(&data->fsf_status_qual, &req->qtcb->header.fsf_status_qual,
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sizeof(union fsf_status_qual));
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memcpy(&data->payloads, &req->qtcb->bottom.support.els,
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sizeof(req->qtcb->bottom.support.els));
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}
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static long zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
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unsigned long buffer)
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{
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struct zfcp_cfdc_data *data;
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struct zfcp_cfdc_data __user *data_user;
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struct zfcp_adapter *adapter;
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struct zfcp_fsf_req *req;
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struct zfcp_fsf_cfdc *fsf_cfdc;
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int retval;
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if (command != ZFCP_CFDC_IOC)
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return -ENOTTY;
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data_user = (void __user *) buffer;
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if (!data_user)
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return -EINVAL;
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fsf_cfdc = kmalloc(sizeof(struct zfcp_fsf_cfdc), GFP_KERNEL);
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if (!fsf_cfdc)
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return -ENOMEM;
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data = kmalloc(sizeof(struct zfcp_cfdc_data), GFP_KERNEL);
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if (!data) {
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retval = -ENOMEM;
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goto no_mem_sense;
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}
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retval = copy_from_user(data, data_user, sizeof(*data));
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if (retval) {
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retval = -EFAULT;
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goto free_buffer;
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}
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if (data->signature != 0xCFDCACDF) {
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retval = -EINVAL;
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goto free_buffer;
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}
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retval = zfcp_cfdc_set_fsf(fsf_cfdc, data->command);
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adapter = zfcp_cfdc_get_adapter(data->devno);
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if (!adapter) {
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retval = -ENXIO;
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goto free_buffer;
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}
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zfcp_adapter_get(adapter);
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retval = zfcp_cfdc_sg_setup(data->command, fsf_cfdc->sg,
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data_user->control_file);
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if (retval)
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goto adapter_put;
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req = zfcp_fsf_control_file(adapter, fsf_cfdc);
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if (IS_ERR(req)) {
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retval = PTR_ERR(req);
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goto free_sg;
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}
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if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
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retval = -ENXIO;
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goto free_fsf;
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}
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zfcp_cfdc_req_to_sense(data, req);
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retval = copy_to_user(data_user, data, sizeof(*data_user));
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if (retval) {
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retval = -EFAULT;
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goto free_fsf;
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}
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if (data->command & ZFCP_CFDC_UPLOAD)
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retval = zfcp_cfdc_copy_to_user(&data_user->control_file,
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fsf_cfdc->sg);
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free_fsf:
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zfcp_fsf_req_free(req);
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free_sg:
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zfcp_sg_free_table(fsf_cfdc->sg, ZFCP_CFDC_PAGES);
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adapter_put:
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zfcp_adapter_put(adapter);
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free_buffer:
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kfree(data);
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no_mem_sense:
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kfree(fsf_cfdc);
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return retval;
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}
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static const struct file_operations zfcp_cfdc_fops = {
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.unlocked_ioctl = zfcp_cfdc_dev_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = zfcp_cfdc_dev_ioctl
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#endif
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};
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struct miscdevice zfcp_cfdc_misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "zfcp_cfdc",
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.fops = &zfcp_cfdc_fops,
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};
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