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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
When calling debugfs functions, there is no need to ever check the return value. The function can work or not, but the code logic should never do something different based on this. This cleans up a lot of unneeded code and logic around the debugfs files, making all of this much simpler and easier to understand. Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: netdev@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
525 lines
16 KiB
C
525 lines
16 KiB
C
/*
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* AMD 10Gb Ethernet driver
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*
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* This file is available to you under your choice of the following two
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* licenses:
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*
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* License 1: GPLv2
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*
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* Copyright (c) 2014 Advanced Micro Devices, Inc.
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*
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* This file is free software; you may copy, redistribute and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or (at
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* your option) any later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* This file incorporates work covered by the following copyright and
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* permission notice:
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* The Synopsys DWC ETHER XGMAC Software Driver and documentation
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* (hereinafter "Software") is an unsupported proprietary work of Synopsys,
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* Inc. unless otherwise expressly agreed to in writing between Synopsys
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* and you.
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*
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* The Software IS NOT an item of Licensed Software or Licensed Product
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* under any End User Software License Agreement or Agreement for Licensed
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* Product with Synopsys or any supplement thereto. Permission is hereby
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* granted, free of charge, to any person obtaining a copy of this software
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* annotated with this license and the Software, to deal in the Software
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* without restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
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* BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* License 2: Modified BSD
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*
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* Copyright (c) 2014 Advanced Micro Devices, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Advanced Micro Devices, Inc. nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file incorporates work covered by the following copyright and
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* permission notice:
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* The Synopsys DWC ETHER XGMAC Software Driver and documentation
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* (hereinafter "Software") is an unsupported proprietary work of Synopsys,
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* Inc. unless otherwise expressly agreed to in writing between Synopsys
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* and you.
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*
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* The Software IS NOT an item of Licensed Software or Licensed Product
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* under any End User Software License Agreement or Agreement for Licensed
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* Product with Synopsys or any supplement thereto. Permission is hereby
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* granted, free of charge, to any person obtaining a copy of this software
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* annotated with this license and the Software, to deal in the Software
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* without restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS"
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* BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "xgbe.h"
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#include "xgbe-common.h"
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static ssize_t xgbe_common_read(char __user *buffer, size_t count,
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loff_t *ppos, unsigned int value)
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{
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char *buf;
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ssize_t len;
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if (*ppos != 0)
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return 0;
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buf = kasprintf(GFP_KERNEL, "0x%08x\n", value);
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if (!buf)
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return -ENOMEM;
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if (count < strlen(buf)) {
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kfree(buf);
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return -ENOSPC;
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}
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len = simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
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kfree(buf);
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return len;
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}
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static ssize_t xgbe_common_write(const char __user *buffer, size_t count,
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loff_t *ppos, unsigned int *value)
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{
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char workarea[32];
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ssize_t len;
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int ret;
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if (*ppos != 0)
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return -EINVAL;
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if (count >= sizeof(workarea))
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return -ENOSPC;
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len = simple_write_to_buffer(workarea, sizeof(workarea) - 1, ppos,
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buffer, count);
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if (len < 0)
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return len;
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workarea[len] = '\0';
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ret = kstrtouint(workarea, 16, value);
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if (ret)
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return -EIO;
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return len;
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}
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static ssize_t xgmac_reg_addr_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xgmac_reg);
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}
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static ssize_t xgmac_reg_addr_write(struct file *filp,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_write(buffer, count, ppos,
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&pdata->debugfs_xgmac_reg);
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}
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static ssize_t xgmac_reg_value_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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value = XGMAC_IOREAD(pdata, pdata->debugfs_xgmac_reg);
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return xgbe_common_read(buffer, count, ppos, value);
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}
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static ssize_t xgmac_reg_value_write(struct file *filp,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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ssize_t len;
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len = xgbe_common_write(buffer, count, ppos, &value);
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if (len < 0)
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return len;
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XGMAC_IOWRITE(pdata, pdata->debugfs_xgmac_reg, value);
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return len;
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}
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static const struct file_operations xgmac_reg_addr_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xgmac_reg_addr_read,
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.write = xgmac_reg_addr_write,
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};
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static const struct file_operations xgmac_reg_value_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xgmac_reg_value_read,
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.write = xgmac_reg_value_write,
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};
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static ssize_t xpcs_mmd_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xpcs_mmd);
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}
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static ssize_t xpcs_mmd_write(struct file *filp, const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_write(buffer, count, ppos,
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&pdata->debugfs_xpcs_mmd);
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}
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static ssize_t xpcs_reg_addr_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xpcs_reg);
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}
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static ssize_t xpcs_reg_addr_write(struct file *filp, const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_write(buffer, count, ppos,
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&pdata->debugfs_xpcs_reg);
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}
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static ssize_t xpcs_reg_value_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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value = XMDIO_READ(pdata, pdata->debugfs_xpcs_mmd,
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pdata->debugfs_xpcs_reg);
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return xgbe_common_read(buffer, count, ppos, value);
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}
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static ssize_t xpcs_reg_value_write(struct file *filp,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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ssize_t len;
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len = xgbe_common_write(buffer, count, ppos, &value);
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if (len < 0)
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return len;
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XMDIO_WRITE(pdata, pdata->debugfs_xpcs_mmd, pdata->debugfs_xpcs_reg,
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value);
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return len;
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}
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static const struct file_operations xpcs_mmd_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xpcs_mmd_read,
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.write = xpcs_mmd_write,
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};
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static const struct file_operations xpcs_reg_addr_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xpcs_reg_addr_read,
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.write = xpcs_reg_addr_write,
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};
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static const struct file_operations xpcs_reg_value_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xpcs_reg_value_read,
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.write = xpcs_reg_value_write,
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};
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static ssize_t xprop_reg_addr_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xprop_reg);
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}
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static ssize_t xprop_reg_addr_write(struct file *filp,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_write(buffer, count, ppos,
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&pdata->debugfs_xprop_reg);
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}
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static ssize_t xprop_reg_value_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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value = XP_IOREAD(pdata, pdata->debugfs_xprop_reg);
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return xgbe_common_read(buffer, count, ppos, value);
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}
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static ssize_t xprop_reg_value_write(struct file *filp,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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ssize_t len;
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len = xgbe_common_write(buffer, count, ppos, &value);
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if (len < 0)
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return len;
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XP_IOWRITE(pdata, pdata->debugfs_xprop_reg, value);
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return len;
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}
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static const struct file_operations xprop_reg_addr_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xprop_reg_addr_read,
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.write = xprop_reg_addr_write,
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};
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static const struct file_operations xprop_reg_value_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xprop_reg_value_read,
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.write = xprop_reg_value_write,
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};
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static ssize_t xi2c_reg_addr_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_read(buffer, count, ppos, pdata->debugfs_xi2c_reg);
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}
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static ssize_t xi2c_reg_addr_write(struct file *filp,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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return xgbe_common_write(buffer, count, ppos,
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&pdata->debugfs_xi2c_reg);
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}
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static ssize_t xi2c_reg_value_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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value = XI2C_IOREAD(pdata, pdata->debugfs_xi2c_reg);
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return xgbe_common_read(buffer, count, ppos, value);
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}
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static ssize_t xi2c_reg_value_write(struct file *filp,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct xgbe_prv_data *pdata = filp->private_data;
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unsigned int value;
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ssize_t len;
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len = xgbe_common_write(buffer, count, ppos, &value);
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if (len < 0)
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return len;
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XI2C_IOWRITE(pdata, pdata->debugfs_xi2c_reg, value);
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return len;
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}
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static const struct file_operations xi2c_reg_addr_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xi2c_reg_addr_read,
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.write = xi2c_reg_addr_write,
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};
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static const struct file_operations xi2c_reg_value_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = xi2c_reg_value_read,
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.write = xi2c_reg_value_write,
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};
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void xgbe_debugfs_init(struct xgbe_prv_data *pdata)
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{
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char *buf;
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/* Set defaults */
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pdata->debugfs_xgmac_reg = 0;
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pdata->debugfs_xpcs_mmd = 1;
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pdata->debugfs_xpcs_reg = 0;
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buf = kasprintf(GFP_KERNEL, "amd-xgbe-%s", pdata->netdev->name);
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if (!buf)
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return;
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pdata->xgbe_debugfs = debugfs_create_dir(buf, NULL);
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debugfs_create_file("xgmac_register", 0600, pdata->xgbe_debugfs, pdata,
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&xgmac_reg_addr_fops);
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debugfs_create_file("xgmac_register_value", 0600, pdata->xgbe_debugfs,
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pdata, &xgmac_reg_value_fops);
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debugfs_create_file("xpcs_mmd", 0600, pdata->xgbe_debugfs, pdata,
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&xpcs_mmd_fops);
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debugfs_create_file("xpcs_register", 0600, pdata->xgbe_debugfs, pdata,
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&xpcs_reg_addr_fops);
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debugfs_create_file("xpcs_register_value", 0600, pdata->xgbe_debugfs,
|
|
pdata, &xpcs_reg_value_fops);
|
|
|
|
if (pdata->xprop_regs) {
|
|
debugfs_create_file("xprop_register", 0600, pdata->xgbe_debugfs,
|
|
pdata, &xprop_reg_addr_fops);
|
|
|
|
debugfs_create_file("xprop_register_value", 0600,
|
|
pdata->xgbe_debugfs, pdata,
|
|
&xprop_reg_value_fops);
|
|
}
|
|
|
|
if (pdata->xi2c_regs) {
|
|
debugfs_create_file("xi2c_register", 0600, pdata->xgbe_debugfs,
|
|
pdata, &xi2c_reg_addr_fops);
|
|
|
|
debugfs_create_file("xi2c_register_value", 0600,
|
|
pdata->xgbe_debugfs, pdata,
|
|
&xi2c_reg_value_fops);
|
|
}
|
|
|
|
if (pdata->vdata->an_cdr_workaround) {
|
|
debugfs_create_bool("an_cdr_workaround", 0600,
|
|
pdata->xgbe_debugfs,
|
|
&pdata->debugfs_an_cdr_workaround);
|
|
|
|
debugfs_create_bool("an_cdr_track_early", 0600,
|
|
pdata->xgbe_debugfs,
|
|
&pdata->debugfs_an_cdr_track_early);
|
|
}
|
|
|
|
kfree(buf);
|
|
}
|
|
|
|
void xgbe_debugfs_exit(struct xgbe_prv_data *pdata)
|
|
{
|
|
debugfs_remove_recursive(pdata->xgbe_debugfs);
|
|
pdata->xgbe_debugfs = NULL;
|
|
}
|
|
|
|
void xgbe_debugfs_rename(struct xgbe_prv_data *pdata)
|
|
{
|
|
char *buf;
|
|
|
|
if (!pdata->xgbe_debugfs)
|
|
return;
|
|
|
|
buf = kasprintf(GFP_KERNEL, "amd-xgbe-%s", pdata->netdev->name);
|
|
if (!buf)
|
|
return;
|
|
|
|
if (!strcmp(pdata->xgbe_debugfs->d_name.name, buf))
|
|
goto out;
|
|
|
|
debugfs_rename(pdata->xgbe_debugfs->d_parent, pdata->xgbe_debugfs,
|
|
pdata->xgbe_debugfs->d_parent, buf);
|
|
|
|
out:
|
|
kfree(buf);
|
|
}
|