License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:07:57 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2008-09-08 17:09:53 +08:00
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/*
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* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
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*
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* Provide default implementations of the DMA mapping callbacks for
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* busses using the iommu infrastructure
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*/
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2019-02-13 15:01:05 +08:00
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#include <linux/dma-direct.h>
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#include <linux/pci.h>
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2008-09-08 17:09:53 +08:00
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#include <asm/iommu.h>
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/*
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* Generic iommu implementation
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*/
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2019-02-13 15:01:05 +08:00
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/*
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* The coherent mask may be smaller than the real mask, check if we can
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* really use a direct window.
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*/
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static inline bool dma_iommu_alloc_bypass(struct device *dev)
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{
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2019-02-13 15:01:09 +08:00
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return dev->archdata.iommu_bypass && !iommu_fixed_is_weak &&
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2019-02-13 15:01:26 +08:00
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dma_direct_supported(dev, dev->coherent_dma_mask);
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2019-02-13 15:01:05 +08:00
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}
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static inline bool dma_iommu_map_bypass(struct device *dev,
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unsigned long attrs)
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{
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2019-02-13 15:01:09 +08:00
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return dev->archdata.iommu_bypass &&
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(!iommu_fixed_is_weak || (attrs & DMA_ATTR_WEAK_ORDERING));
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2019-02-13 15:01:05 +08:00
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}
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2008-09-08 17:09:53 +08:00
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/* Allocates a contiguous real buffer and creates mappings over it.
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* Returns the virtual address of the buffer and sets dma_handle
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* to the dma address (mapping) of the first page.
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*/
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static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
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2011-12-06 21:14:46 +08:00
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dma_addr_t *dma_handle, gfp_t flag,
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2016-08-04 04:46:00 +08:00
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unsigned long attrs)
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2008-09-08 17:09:53 +08:00
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{
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2019-02-13 15:01:05 +08:00
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if (dma_iommu_alloc_bypass(dev))
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2019-02-13 15:01:28 +08:00
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return dma_direct_alloc(dev, size, dma_handle, flag, attrs);
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2009-09-21 16:26:35 +08:00
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return iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
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2010-10-18 15:27:04 +08:00
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dma_handle, dev->coherent_dma_mask, flag,
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2008-09-08 17:09:54 +08:00
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dev_to_node(dev));
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2008-09-08 17:09:53 +08:00
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}
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static void dma_iommu_free_coherent(struct device *dev, size_t size,
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2011-12-06 21:14:46 +08:00
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void *vaddr, dma_addr_t dma_handle,
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2016-08-04 04:46:00 +08:00
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unsigned long attrs)
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2008-09-08 17:09:53 +08:00
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{
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2019-02-13 15:01:05 +08:00
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if (dma_iommu_alloc_bypass(dev))
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2019-02-13 15:01:28 +08:00
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dma_direct_free(dev, size, vaddr, dma_handle, attrs);
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2019-02-13 15:01:05 +08:00
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else
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iommu_free_coherent(get_iommu_table_base(dev), size, vaddr,
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dma_handle);
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2008-09-08 17:09:53 +08:00
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}
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/* Creates TCEs for a user provided buffer. The user buffer must be
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2008-10-28 04:38:08 +08:00
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* contiguous real kernel storage (not vmalloc). The address passed here
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* comprises a page address and offset into that page. The dma_addr_t
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* returned will point to the same byte within the page as was passed in.
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2008-09-08 17:09:53 +08:00
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*/
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2008-10-28 04:38:08 +08:00
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static dma_addr_t dma_iommu_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction,
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2016-08-04 04:46:00 +08:00
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unsigned long attrs)
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2008-09-08 17:09:53 +08:00
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{
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2019-02-13 15:01:05 +08:00
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if (dma_iommu_map_bypass(dev, attrs))
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2019-02-13 15:01:29 +08:00
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return dma_direct_map_page(dev, page, offset, size, direction,
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2019-02-13 15:01:05 +08:00
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attrs);
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2009-09-21 16:26:35 +08:00
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return iommu_map_page(dev, get_iommu_table_base(dev), page, offset,
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size, device_to_mask(dev), direction, attrs);
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2008-09-08 17:09:53 +08:00
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}
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2008-10-28 04:38:08 +08:00
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static void dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction,
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2016-08-04 04:46:00 +08:00
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unsigned long attrs)
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2008-09-08 17:09:53 +08:00
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{
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2019-02-13 15:01:05 +08:00
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if (!dma_iommu_map_bypass(dev, attrs))
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iommu_unmap_page(get_iommu_table_base(dev), dma_handle, size,
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direction, attrs);
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2008-09-08 17:09:53 +08:00
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}
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static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
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int nelems, enum dma_data_direction direction,
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2016-08-04 04:46:00 +08:00
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unsigned long attrs)
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2008-09-08 17:09:53 +08:00
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{
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2019-02-13 15:01:05 +08:00
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if (dma_iommu_map_bypass(dev, attrs))
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2019-02-13 15:01:29 +08:00
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return dma_direct_map_sg(dev, sglist, nelems, direction, attrs);
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2014-11-05 22:28:30 +08:00
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return ppc_iommu_map_sg(dev, get_iommu_table_base(dev), sglist, nelems,
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device_to_mask(dev), direction, attrs);
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2008-09-08 17:09:53 +08:00
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}
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static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
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int nelems, enum dma_data_direction direction,
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2016-08-04 04:46:00 +08:00
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unsigned long attrs)
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2008-09-08 17:09:53 +08:00
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{
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2019-02-13 15:01:05 +08:00
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if (!dma_iommu_map_bypass(dev, attrs))
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ppc_iommu_unmap_sg(get_iommu_table_base(dev), sglist, nelems,
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2014-11-05 22:28:30 +08:00
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direction, attrs);
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2008-09-08 17:09:53 +08:00
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}
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2019-02-13 15:01:05 +08:00
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static bool dma_iommu_bypass_supported(struct device *dev, u64 mask)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct pci_controller *phb = pci_bus_to_host(pdev->bus);
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return phb->controller_ops.iommu_bypass_supported &&
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phb->controller_ops.iommu_bypass_supported(pdev, mask);
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}
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2008-09-08 17:09:53 +08:00
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/* We support DMA to/from any memory page via the iommu */
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2015-06-24 13:25:31 +08:00
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int dma_iommu_dma_supported(struct device *dev, u64 mask)
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2008-09-08 17:09:53 +08:00
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{
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2009-09-21 16:26:35 +08:00
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struct iommu_table *tbl = get_iommu_table_base(dev);
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2008-09-08 17:09:53 +08:00
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2010-09-15 16:05:45 +08:00
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if (!tbl) {
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dev_info(dev, "Warning: IOMMU dma not supported: mask 0x%08llx"
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", table unavailable\n", mask);
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return 0;
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}
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2019-02-13 15:01:05 +08:00
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if (dev_is_pci(dev) && dma_iommu_bypass_supported(dev, mask)) {
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dev->archdata.iommu_bypass = true;
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dev_dbg(dev, "iommu: 64-bit OK, using fixed ops\n");
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return 1;
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}
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2013-12-09 15:17:03 +08:00
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if (tbl->it_offset > (mask >> tbl->it_page_shift)) {
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2012-08-18 15:34:15 +08:00
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dev_info(dev, "Warning: IOMMU offset too big for device mask\n");
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dev_info(dev, "mask: 0x%08llx, table offset: 0x%08lx\n",
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2013-12-09 15:17:03 +08:00
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mask, tbl->it_offset << tbl->it_page_shift);
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2008-09-08 17:09:53 +08:00
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return 0;
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2019-02-13 15:01:05 +08:00
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}
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dev_dbg(dev, "iommu: not 64-bit, using default ops\n");
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dev->archdata.iommu_bypass = false;
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return 1;
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2008-09-08 17:09:53 +08:00
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}
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2019-02-13 15:01:04 +08:00
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u64 dma_iommu_get_required_mask(struct device *dev)
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2011-06-24 17:05:22 +08:00
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{
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struct iommu_table *tbl = get_iommu_table_base(dev);
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u64 mask;
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2019-02-13 15:01:05 +08:00
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2011-06-24 17:05:22 +08:00
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if (!tbl)
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return 0;
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2019-02-13 15:01:05 +08:00
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if (dev_is_pci(dev)) {
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2019-02-13 15:01:25 +08:00
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u64 bypass_mask = dma_direct_get_required_mask(dev);
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2019-02-13 15:01:05 +08:00
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if (dma_iommu_bypass_supported(dev, bypass_mask))
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return bypass_mask;
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}
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2011-06-24 17:05:22 +08:00
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mask = 1ULL < (fls_long(tbl->it_offset + tbl->it_size) - 1);
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mask += mask - 1;
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return mask;
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}
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2019-02-13 15:01:09 +08:00
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const struct dma_map_ops dma_iommu_ops = {
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2011-12-06 21:14:46 +08:00
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.alloc = dma_iommu_alloc_coherent,
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.free = dma_iommu_free_coherent,
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2011-06-24 17:05:25 +08:00
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.map_sg = dma_iommu_map_sg,
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.unmap_sg = dma_iommu_unmap_sg,
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.dma_supported = dma_iommu_dma_supported,
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.map_page = dma_iommu_map_page,
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.unmap_page = dma_iommu_unmap_page,
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2011-06-24 17:05:24 +08:00
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.get_required_mask = dma_iommu_get_required_mask,
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2008-09-08 17:09:53 +08:00
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};
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