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182 lines
5.4 KiB
182 lines
5.4 KiB
/* |
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* Copyright(c) 2015, 2016 Intel Corporation. |
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* |
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* This file is provided under a dual BSD/GPLv2 license. When using or |
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* redistributing this file, you may do so under either license. |
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* |
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* GPL LICENSE SUMMARY |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of version 2 of the GNU General Public License as |
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* published by the Free Software Foundation. |
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* |
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* This program 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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* BSD LICENSE |
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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 |
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* are met: |
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* |
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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 |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* - Neither the name of Intel Corporation nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* 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 |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* 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 |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <linux/ctype.h> |
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#include "efivar.h" |
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/* GUID for HFI1 variables in EFI */ |
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#define HFI1_EFIVAR_GUID EFI_GUID(0xc50a953e, 0xa8b2, 0x42a6, \ |
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0xbf, 0x89, 0xd3, 0x33, 0xa6, 0xe9, 0xe6, 0xd4) |
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/* largest EFI data size we expect */ |
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#define EFI_DATA_SIZE 4096 |
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/* |
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* Read the named EFI variable. Return the size of the actual data in *size |
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* and a kmalloc'ed buffer in *return_data. The caller must free the |
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* data. It is guaranteed that *return_data will be NULL and *size = 0 |
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* if this routine fails. |
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* |
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* Return 0 on success, -errno on failure. |
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*/ |
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static int read_efi_var(const char *name, unsigned long *size, |
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void **return_data) |
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{ |
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efi_status_t status; |
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efi_char16_t *uni_name; |
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efi_guid_t guid; |
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unsigned long temp_size; |
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void *temp_buffer; |
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void *data; |
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int i; |
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int ret; |
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/* set failure return values */ |
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*size = 0; |
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*return_data = NULL; |
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if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE)) |
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return -EOPNOTSUPP; |
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uni_name = kcalloc(strlen(name) + 1, sizeof(efi_char16_t), GFP_KERNEL); |
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temp_buffer = kzalloc(EFI_DATA_SIZE, GFP_KERNEL); |
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if (!uni_name || !temp_buffer) { |
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ret = -ENOMEM; |
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goto fail; |
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} |
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/* input: the size of the buffer */ |
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temp_size = EFI_DATA_SIZE; |
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/* convert ASCII to unicode - it is a 1:1 mapping */ |
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for (i = 0; name[i]; i++) |
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uni_name[i] = name[i]; |
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/* need a variable for our GUID */ |
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guid = HFI1_EFIVAR_GUID; |
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/* call into EFI runtime services */ |
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status = efi.get_variable( |
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uni_name, |
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&guid, |
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NULL, |
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&temp_size, |
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temp_buffer); |
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/* |
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* It would be nice to call efi_status_to_err() here, but that |
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* is in the EFIVAR_FS code and may not be compiled in. |
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* However, even that is insufficient since it does not cover |
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* EFI_BUFFER_TOO_SMALL which could be an important return. |
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* For now, just split out succces or not found. |
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*/ |
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ret = status == EFI_SUCCESS ? 0 : |
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status == EFI_NOT_FOUND ? -ENOENT : |
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-EINVAL; |
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if (ret) |
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goto fail; |
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/* |
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* We have successfully read the EFI variable into our |
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* temporary buffer. Now allocate a correctly sized |
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* buffer. |
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*/ |
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data = kmemdup(temp_buffer, temp_size, GFP_KERNEL); |
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if (!data) { |
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ret = -ENOMEM; |
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goto fail; |
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} |
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*size = temp_size; |
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*return_data = data; |
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fail: |
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kfree(uni_name); |
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kfree(temp_buffer); |
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return ret; |
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} |
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/* |
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* Read an HFI1 EFI variable of the form: |
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* <PCIe address>-<kind> |
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* Return an kalloc'ed array and size of the data. |
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* |
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* Returns 0 on success, -errno on failure. |
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*/ |
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int read_hfi1_efi_var(struct hfi1_devdata *dd, const char *kind, |
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unsigned long *size, void **return_data) |
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{ |
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char prefix_name[64]; |
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char name[64]; |
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int result; |
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int i; |
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/* create a common prefix */ |
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snprintf(prefix_name, sizeof(prefix_name), "%04x:%02x:%02x.%x", |
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pci_domain_nr(dd->pcidev->bus), |
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dd->pcidev->bus->number, |
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PCI_SLOT(dd->pcidev->devfn), |
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PCI_FUNC(dd->pcidev->devfn)); |
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snprintf(name, sizeof(name), "%s-%s", prefix_name, kind); |
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result = read_efi_var(name, size, return_data); |
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/* |
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* If reading the lowercase EFI variable fail, read the uppercase |
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* variable. |
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*/ |
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if (result) { |
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/* Converting to uppercase */ |
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for (i = 0; prefix_name[i]; i++) |
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if (isalpha(prefix_name[i])) |
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prefix_name[i] = toupper(prefix_name[i]); |
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snprintf(name, sizeof(name), "%s-%s", prefix_name, kind); |
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result = read_efi_var(name, size, return_data); |
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} |
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return result; |
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}
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