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ipath_sysfs.c

/*
 * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
 * Copyright (c) 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/ctype.h>

#include "ipath_kernel.h"
#include "ipath_common.h"

/**
 * ipath_parse_ushort - parse an unsigned short value in an arbitrary base
 * @str: the string containing the number
 * @valp: where to put the result
 *
 * returns the number of bytes consumed, or negative value on error
 */
int ipath_parse_ushort(const char *str, unsigned short *valp)
{
      unsigned long val;
      char *end;
      int ret;

      if (!isdigit(str[0])) {
            ret = -EINVAL;
            goto bail;
      }

      val = simple_strtoul(str, &end, 0);

      if (val > 0xffff) {
            ret = -EINVAL;
            goto bail;
      }

      *valp = val;

      ret = end + 1 - str;
      if (ret == 0)
            ret = -EINVAL;

bail:
      return ret;
}

static ssize_t show_version(struct device_driver *dev, char *buf)
{
      /* The string printed here is already newline-terminated. */
      return scnprintf(buf, PAGE_SIZE, "%s", ib_ipath_version);
}

static ssize_t show_num_units(struct device_driver *dev, char *buf)
{
      return scnprintf(buf, PAGE_SIZE, "%d\n",
                   ipath_count_units(NULL, NULL, NULL));
}

static ssize_t show_status(struct device *dev,
                     struct device_attribute *attr,
                     char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      ssize_t ret;

      if (!dd->ipath_statusp) {
            ret = -EINVAL;
            goto bail;
      }

      ret = scnprintf(buf, PAGE_SIZE, "0x%llx\n",
                  (unsigned long long) *(dd->ipath_statusp));

bail:
      return ret;
}

static const char *ipath_status_str[] = {
      "Initted",
      "Disabled",
      "Admin_Disabled",
      "", /* This used to be the old "OIB_SMA" status. */
      "", /* This used to be the old "SMA" status. */
      "Present",
      "IB_link_up",
      "IB_configured",
      "NoIBcable",
      "Fatal_Hardware_Error",
      NULL,
};

static ssize_t show_status_str(struct device *dev,
                         struct device_attribute *attr,
                         char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      int i, any;
      u64 s;
      ssize_t ret;

      if (!dd->ipath_statusp) {
            ret = -EINVAL;
            goto bail;
      }

      s = *(dd->ipath_statusp);
      *buf = '\0';
      for (any = i = 0; s && ipath_status_str[i]; i++) {
            if (s & 1) {
                  if (any && strlcat(buf, " ", PAGE_SIZE) >=
                      PAGE_SIZE)
                        /* overflow */
                        break;
                  if (strlcat(buf, ipath_status_str[i],
                            PAGE_SIZE) >= PAGE_SIZE)
                        break;
                  any = 1;
            }
            s >>= 1;
      }
      if (any)
            strlcat(buf, "\n", PAGE_SIZE);

      ret = strlen(buf);

bail:
      return ret;
}

static ssize_t show_boardversion(struct device *dev,
                         struct device_attribute *attr,
                         char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      /* The string printed here is already newline-terminated. */
      return scnprintf(buf, PAGE_SIZE, "%s", dd->ipath_boardversion);
}

static ssize_t show_lmc(struct device *dev,
                  struct device_attribute *attr,
                  char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);

      return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_lmc);
}

static ssize_t store_lmc(struct device *dev,
                   struct device_attribute *attr,
                   const char *buf,
                   size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      u16 lmc = 0;
      int ret;

      ret = ipath_parse_ushort(buf, &lmc);
      if (ret < 0)
            goto invalid;

      if (lmc > 7) {
            ret = -EINVAL;
            goto invalid;
      }

      ipath_set_lid(dd, dd->ipath_lid, lmc);

      goto bail;
invalid:
      ipath_dev_err(dd, "attempt to set invalid LMC %u\n", lmc);
bail:
      return ret;
}

static ssize_t show_lid(struct device *dev,
                  struct device_attribute *attr,
                  char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);

      return scnprintf(buf, PAGE_SIZE, "0x%x\n", dd->ipath_lid);
}

static ssize_t store_lid(struct device *dev,
                   struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      u16 lid = 0;
      int ret;

      ret = ipath_parse_ushort(buf, &lid);
      if (ret < 0)
            goto invalid;

      if (lid == 0 || lid >= IPATH_MULTICAST_LID_BASE) {
            ret = -EINVAL;
            goto invalid;
      }

      ipath_set_lid(dd, lid, dd->ipath_lmc);

      goto bail;
invalid:
      ipath_dev_err(dd, "attempt to set invalid LID 0x%x\n", lid);
bail:
      return ret;
}

static ssize_t show_mlid(struct device *dev,
                   struct device_attribute *attr,
                   char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);

      return scnprintf(buf, PAGE_SIZE, "0x%x\n", dd->ipath_mlid);
}

static ssize_t store_mlid(struct device *dev,
                   struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      u16 mlid;
      int ret;

      ret = ipath_parse_ushort(buf, &mlid);
      if (ret < 0 || mlid < IPATH_MULTICAST_LID_BASE)
            goto invalid;

      dd->ipath_mlid = mlid;

      goto bail;
invalid:
      ipath_dev_err(dd, "attempt to set invalid MLID\n");
bail:
      return ret;
}

static ssize_t show_guid(struct device *dev,
                   struct device_attribute *attr,
                   char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      u8 *guid;

      guid = (u8 *) & (dd->ipath_guid);

      return scnprintf(buf, PAGE_SIZE,
                   "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
                   guid[0], guid[1], guid[2], guid[3],
                   guid[4], guid[5], guid[6], guid[7]);
}

static ssize_t store_guid(struct device *dev,
                   struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      ssize_t ret;
      unsigned short guid[8];
      __be64 new_guid;
      u8 *ng;
      int i;

      if (sscanf(buf, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
               &guid[0], &guid[1], &guid[2], &guid[3],
               &guid[4], &guid[5], &guid[6], &guid[7]) != 8)
            goto invalid;

      ng = (u8 *) &new_guid;

      for (i = 0; i < 8; i++) {
            if (guid[i] > 0xff)
                  goto invalid;
            ng[i] = guid[i];
      }

      if (new_guid == 0)
            goto invalid;

      dd->ipath_guid = new_guid;
      dd->ipath_nguid = 1;

      ret = strlen(buf);
      goto bail;

invalid:
      ipath_dev_err(dd, "attempt to set invalid GUID\n");
      ret = -EINVAL;

bail:
      return ret;
}

static ssize_t show_nguid(struct device *dev,
                    struct device_attribute *attr,
                    char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);

      return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_nguid);
}

static ssize_t show_nports(struct device *dev,
                     struct device_attribute *attr,
                     char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);

      /* Return the number of user ports available. */
      return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_cfgports - 1);
}

static ssize_t show_serial(struct device *dev,
                     struct device_attribute *attr,
                     char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);

      buf[sizeof dd->ipath_serial] = '\0';
      memcpy(buf, dd->ipath_serial, sizeof dd->ipath_serial);
      strcat(buf, "\n");
      return strlen(buf);
}

static ssize_t show_unit(struct device *dev,
                   struct device_attribute *attr,
                   char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);

      return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_unit);
}

#define DEVICE_COUNTER(name, attr) \
      static ssize_t show_counter_##name(struct device *dev, \
                                 struct device_attribute *attr, \
                                 char *buf) \
      { \
            struct ipath_devdata *dd = dev_get_drvdata(dev); \
            return scnprintf(\
                  buf, PAGE_SIZE, "%llu\n", (unsigned long long) \
                  ipath_snap_cntr( \
                        dd, offsetof(struct infinipath_counters, \
                                   attr) / sizeof(u64)));   \
      } \
      static DEVICE_ATTR(name, S_IRUGO, show_counter_##name, NULL);

DEVICE_COUNTER(ib_link_downeds, IBLinkDownedCnt);
DEVICE_COUNTER(ib_link_err_recoveries, IBLinkErrRecoveryCnt);
DEVICE_COUNTER(ib_status_changes, IBStatusChangeCnt);
DEVICE_COUNTER(ib_symbol_errs, IBSymbolErrCnt);
DEVICE_COUNTER(lb_flow_stalls, LBFlowStallCnt);
DEVICE_COUNTER(lb_ints, LBIntCnt);
DEVICE_COUNTER(rx_bad_formats, RxBadFormatCnt);
DEVICE_COUNTER(rx_buf_ovfls, RxBufOvflCnt);
DEVICE_COUNTER(rx_data_pkts, RxDataPktCnt);
DEVICE_COUNTER(rx_dropped_pkts, RxDroppedPktCnt);
DEVICE_COUNTER(rx_dwords, RxDwordCnt);
DEVICE_COUNTER(rx_ebps, RxEBPCnt);
DEVICE_COUNTER(rx_flow_ctrl_errs, RxFlowCtrlErrCnt);
DEVICE_COUNTER(rx_flow_pkts, RxFlowPktCnt);
DEVICE_COUNTER(rx_icrc_errs, RxICRCErrCnt);
DEVICE_COUNTER(rx_len_errs, RxLenErrCnt);
DEVICE_COUNTER(rx_link_problems, RxLinkProblemCnt);
DEVICE_COUNTER(rx_lpcrc_errs, RxLPCRCErrCnt);
DEVICE_COUNTER(rx_max_min_len_errs, RxMaxMinLenErrCnt);
DEVICE_COUNTER(rx_p0_hdr_egr_ovfls, RxP0HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p1_hdr_egr_ovfls, RxP1HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p2_hdr_egr_ovfls, RxP2HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p3_hdr_egr_ovfls, RxP3HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p4_hdr_egr_ovfls, RxP4HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p5_hdr_egr_ovfls, RxP5HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p6_hdr_egr_ovfls, RxP6HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p7_hdr_egr_ovfls, RxP7HdrEgrOvflCnt);
DEVICE_COUNTER(rx_p8_hdr_egr_ovfls, RxP8HdrEgrOvflCnt);
DEVICE_COUNTER(rx_pkey_mismatches, RxPKeyMismatchCnt);
DEVICE_COUNTER(rx_tid_full_errs, RxTIDFullErrCnt);
DEVICE_COUNTER(rx_tid_valid_errs, RxTIDValidErrCnt);
DEVICE_COUNTER(rx_vcrc_errs, RxVCRCErrCnt);
DEVICE_COUNTER(tx_data_pkts, TxDataPktCnt);
DEVICE_COUNTER(tx_dropped_pkts, TxDroppedPktCnt);
DEVICE_COUNTER(tx_dwords, TxDwordCnt);
DEVICE_COUNTER(tx_flow_pkts, TxFlowPktCnt);
DEVICE_COUNTER(tx_flow_stalls, TxFlowStallCnt);
DEVICE_COUNTER(tx_len_errs, TxLenErrCnt);
DEVICE_COUNTER(tx_max_min_len_errs, TxMaxMinLenErrCnt);
DEVICE_COUNTER(tx_underruns, TxUnderrunCnt);
DEVICE_COUNTER(tx_unsup_vl_errs, TxUnsupVLErrCnt);

static struct attribute *dev_counter_attributes[] = {
      &dev_attr_ib_link_downeds.attr,
      &dev_attr_ib_link_err_recoveries.attr,
      &dev_attr_ib_status_changes.attr,
      &dev_attr_ib_symbol_errs.attr,
      &dev_attr_lb_flow_stalls.attr,
      &dev_attr_lb_ints.attr,
      &dev_attr_rx_bad_formats.attr,
      &dev_attr_rx_buf_ovfls.attr,
      &dev_attr_rx_data_pkts.attr,
      &dev_attr_rx_dropped_pkts.attr,
      &dev_attr_rx_dwords.attr,
      &dev_attr_rx_ebps.attr,
      &dev_attr_rx_flow_ctrl_errs.attr,
      &dev_attr_rx_flow_pkts.attr,
      &dev_attr_rx_icrc_errs.attr,
      &dev_attr_rx_len_errs.attr,
      &dev_attr_rx_link_problems.attr,
      &dev_attr_rx_lpcrc_errs.attr,
      &dev_attr_rx_max_min_len_errs.attr,
      &dev_attr_rx_p0_hdr_egr_ovfls.attr,
      &dev_attr_rx_p1_hdr_egr_ovfls.attr,
      &dev_attr_rx_p2_hdr_egr_ovfls.attr,
      &dev_attr_rx_p3_hdr_egr_ovfls.attr,
      &dev_attr_rx_p4_hdr_egr_ovfls.attr,
      &dev_attr_rx_p5_hdr_egr_ovfls.attr,
      &dev_attr_rx_p6_hdr_egr_ovfls.attr,
      &dev_attr_rx_p7_hdr_egr_ovfls.attr,
      &dev_attr_rx_p8_hdr_egr_ovfls.attr,
      &dev_attr_rx_pkey_mismatches.attr,
      &dev_attr_rx_tid_full_errs.attr,
      &dev_attr_rx_tid_valid_errs.attr,
      &dev_attr_rx_vcrc_errs.attr,
      &dev_attr_tx_data_pkts.attr,
      &dev_attr_tx_dropped_pkts.attr,
      &dev_attr_tx_dwords.attr,
      &dev_attr_tx_flow_pkts.attr,
      &dev_attr_tx_flow_stalls.attr,
      &dev_attr_tx_len_errs.attr,
      &dev_attr_tx_max_min_len_errs.attr,
      &dev_attr_tx_underruns.attr,
      &dev_attr_tx_unsup_vl_errs.attr,
      NULL
};

static struct attribute_group dev_counter_attr_group = {
      .name = "counters",
      .attrs = dev_counter_attributes
};

static ssize_t store_reset(struct device *dev,
                   struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      int ret;

      if (count < 5 || memcmp(buf, "reset", 5)) {
            ret = -EINVAL;
            goto bail;
      }

      if (dd->ipath_flags & IPATH_DISABLED) {
            /*
             * post-reset init would re-enable interrupts, etc.
             * so don't allow reset on disabled devices.  Not
             * perfect error, but about the best choice.
             */
            dev_info(dev,"Unit %d is disabled, can't reset\n",
                   dd->ipath_unit);
            ret = -EINVAL;
      }
      ret = ipath_reset_device(dd->ipath_unit);
bail:
      return ret<0 ? ret : count;
}

static ssize_t store_link_state(struct device *dev,
                   struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      int ret, r;
      u16 state;

      ret = ipath_parse_ushort(buf, &state);
      if (ret < 0)
            goto invalid;

      r = ipath_set_linkstate(dd, state);
      if (r < 0) {
            ret = r;
            goto bail;
      }

      goto bail;
invalid:
      ipath_dev_err(dd, "attempt to set invalid link state\n");
bail:
      return ret;
}

static ssize_t show_mtu(struct device *dev,
                   struct device_attribute *attr,
                   char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      return scnprintf(buf, PAGE_SIZE, "%u\n", dd->ipath_ibmtu);
}

static ssize_t store_mtu(struct device *dev,
                   struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      ssize_t ret;
      u16 mtu = 0;
      int r;

      ret = ipath_parse_ushort(buf, &mtu);
      if (ret < 0)
            goto invalid;

      r = ipath_set_mtu(dd, mtu);
      if (r < 0)
            ret = r;

      goto bail;
invalid:
      ipath_dev_err(dd, "attempt to set invalid MTU\n");
bail:
      return ret;
}

static ssize_t show_enabled(struct device *dev,
                   struct device_attribute *attr,
                   char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      return scnprintf(buf, PAGE_SIZE, "%u\n",
                   (dd->ipath_flags & IPATH_DISABLED) ? 0 : 1);
}

static ssize_t store_enabled(struct device *dev,
                   struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      ssize_t ret;
      u16 enable = 0;

      ret = ipath_parse_ushort(buf, &enable);
      if (ret < 0) {
            ipath_dev_err(dd, "attempt to use non-numeric on enable\n");
            goto bail;
      }

      if (enable) {
            if (!(dd->ipath_flags & IPATH_DISABLED))
                  goto bail;

            dev_info(dev, "Enabling unit %d\n", dd->ipath_unit);
            /* same as post-reset */
            ret = ipath_init_chip(dd, 1);
            if (ret)
                  ipath_dev_err(dd, "Failed to enable unit %d\n",
                              dd->ipath_unit);
            else {
                  dd->ipath_flags &= ~IPATH_DISABLED;
                  *dd->ipath_statusp &= ~IPATH_STATUS_ADMIN_DISABLED;
            }
      }
      else if (!(dd->ipath_flags & IPATH_DISABLED)) {
            dev_info(dev, "Disabling unit %d\n", dd->ipath_unit);
            ipath_shutdown_device(dd);
            dd->ipath_flags |= IPATH_DISABLED;
            *dd->ipath_statusp |= IPATH_STATUS_ADMIN_DISABLED;
      }

bail:
      return ret;
}

static ssize_t store_rx_pol_inv(struct device *dev,
                    struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      int ret, r;
      u16 val;

      ret = ipath_parse_ushort(buf, &val);
      if (ret < 0)
            goto invalid;

      r = ipath_set_rx_pol_inv(dd, val);
      if (r < 0) {
            ret = r;
            goto bail;
      }

      goto bail;
invalid:
      ipath_dev_err(dd, "attempt to set invalid Rx Polarity invert\n");
bail:
      return ret;
}

static ssize_t store_led_override(struct device *dev,
                    struct device_attribute *attr,
                    const char *buf,
                    size_t count)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      int ret;
      u16 val;

      ret = ipath_parse_ushort(buf, &val);
      if (ret > 0)
            ipath_set_led_override(dd, val);
      else
            ipath_dev_err(dd, "attempt to set invalid LED override\n");
      return ret;
}

static ssize_t show_logged_errs(struct device *dev,
                        struct device_attribute *attr,
                        char *buf)
{
      struct ipath_devdata *dd = dev_get_drvdata(dev);
      int idx, count;

      /* force consistency with actual EEPROM */
      if (ipath_update_eeprom_log(dd) != 0)
            return -ENXIO;

      count = 0;
      for (idx = 0; idx < IPATH_EEP_LOG_CNT; ++idx) {
            count += scnprintf(buf + count, PAGE_SIZE - count, "%d%c",
                  dd->ipath_eep_st_errs[idx],
                  idx == (IPATH_EEP_LOG_CNT - 1) ? '\n' : ' ');
      }

      return count;
}

static DRIVER_ATTR(num_units, S_IRUGO, show_num_units, NULL);
static DRIVER_ATTR(version, S_IRUGO, show_version, NULL);

static struct attribute *driver_attributes[] = {
      &driver_attr_num_units.attr,
      &driver_attr_version.attr,
      NULL
};

static struct attribute_group driver_attr_group = {
      .attrs = driver_attributes
};

static DEVICE_ATTR(guid, S_IWUSR | S_IRUGO, show_guid, store_guid);
static DEVICE_ATTR(lmc, S_IWUSR | S_IRUGO, show_lmc, store_lmc);
static DEVICE_ATTR(lid, S_IWUSR | S_IRUGO, show_lid, store_lid);
static DEVICE_ATTR(link_state, S_IWUSR, NULL, store_link_state);
static DEVICE_ATTR(mlid, S_IWUSR | S_IRUGO, show_mlid, store_mlid);
static DEVICE_ATTR(mtu, S_IWUSR | S_IRUGO, show_mtu, store_mtu);
static DEVICE_ATTR(enabled, S_IWUSR | S_IRUGO, show_enabled, store_enabled);
static DEVICE_ATTR(nguid, S_IRUGO, show_nguid, NULL);
static DEVICE_ATTR(nports, S_IRUGO, show_nports, NULL);
static DEVICE_ATTR(reset, S_IWUSR, NULL, store_reset);
static DEVICE_ATTR(serial, S_IRUGO, show_serial, NULL);
static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
static DEVICE_ATTR(status_str, S_IRUGO, show_status_str, NULL);
static DEVICE_ATTR(boardversion, S_IRUGO, show_boardversion, NULL);
static DEVICE_ATTR(unit, S_IRUGO, show_unit, NULL);
static DEVICE_ATTR(rx_pol_inv, S_IWUSR, NULL, store_rx_pol_inv);
static DEVICE_ATTR(led_override, S_IWUSR, NULL, store_led_override);
static DEVICE_ATTR(logged_errors, S_IRUGO, show_logged_errs, NULL);

static struct attribute *dev_attributes[] = {
      &dev_attr_guid.attr,
      &dev_attr_lmc.attr,
      &dev_attr_lid.attr,
      &dev_attr_link_state.attr,
      &dev_attr_mlid.attr,
      &dev_attr_mtu.attr,
      &dev_attr_nguid.attr,
      &dev_attr_nports.attr,
      &dev_attr_serial.attr,
      &dev_attr_status.attr,
      &dev_attr_status_str.attr,
      &dev_attr_boardversion.attr,
      &dev_attr_unit.attr,
      &dev_attr_enabled.attr,
      &dev_attr_rx_pol_inv.attr,
      &dev_attr_led_override.attr,
      &dev_attr_logged_errors.attr,
      NULL
};

static struct attribute_group dev_attr_group = {
      .attrs = dev_attributes
};

/**
 * ipath_expose_reset - create a device reset file
 * @dev: the device structure
 *
 * Only expose a file that lets us reset the device after someone
 * enters diag mode.  A device reset is quite likely to crash the
 * machine entirely, so we don't want to normally make it
 * available.
 *
 * Called with ipath_mutex held.
 */
int ipath_expose_reset(struct device *dev)
{
      static int exposed;
      int ret;

      if (!exposed) {
            ret = device_create_file(dev, &dev_attr_reset);
            exposed = 1;
      }
      else
            ret = 0;

      return ret;
}

int ipath_driver_create_group(struct device_driver *drv)
{
      int ret;

      ret = sysfs_create_group(&drv->kobj, &driver_attr_group);

      return ret;
}

void ipath_driver_remove_group(struct device_driver *drv)
{
      sysfs_remove_group(&drv->kobj, &driver_attr_group);
}

int ipath_device_create_group(struct device *dev, struct ipath_devdata *dd)
{
      int ret;
      char unit[5];

      ret = sysfs_create_group(&dev->kobj, &dev_attr_group);
      if (ret)
            goto bail;

      ret = sysfs_create_group(&dev->kobj, &dev_counter_attr_group);
      if (ret)
            goto bail_attrs;

      snprintf(unit, sizeof(unit), "%02d", dd->ipath_unit);
      ret = sysfs_create_link(&dev->driver->kobj, &dev->kobj, unit);
      if (ret == 0)
            goto bail;

      sysfs_remove_group(&dev->kobj, &dev_counter_attr_group);
bail_attrs:
      sysfs_remove_group(&dev->kobj, &dev_attr_group);
bail:
      return ret;
}

void ipath_device_remove_group(struct device *dev, struct ipath_devdata *dd)
{
      char unit[5];

      snprintf(unit, sizeof(unit), "%02d", dd->ipath_unit);
      sysfs_remove_link(&dev->driver->kobj, unit);

      sysfs_remove_group(&dev->kobj, &dev_counter_attr_group);
      sysfs_remove_group(&dev->kobj, &dev_attr_group);

      device_remove_file(dev, &dev_attr_reset);
}

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