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b24413180f
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>
153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_ARM_DMA_H
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#define __ASM_ARM_DMA_H
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/*
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* This is the maximum virtual address which can be DMA'd from.
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*/
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#ifndef CONFIG_ZONE_DMA
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#define MAX_DMA_ADDRESS 0xffffffffUL
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#else
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#define MAX_DMA_ADDRESS ({ \
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extern phys_addr_t arm_dma_zone_size; \
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arm_dma_zone_size && arm_dma_zone_size < (0x10000000 - PAGE_OFFSET) ? \
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(PAGE_OFFSET + arm_dma_zone_size) : 0xffffffffUL; })
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#endif
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#ifdef CONFIG_ISA_DMA_API
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/*
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* This is used to support drivers written for the x86 ISA DMA API.
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* It should not be re-used except for that purpose.
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*/
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#include <linux/spinlock.h>
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#include <linux/scatterlist.h>
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#include <mach/isa-dma.h>
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/*
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* The DMA modes reflect the settings for the ISA DMA controller
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*/
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#define DMA_MODE_MASK 0xcc
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#define DMA_MODE_READ 0x44
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#define DMA_MODE_WRITE 0x48
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#define DMA_MODE_CASCADE 0xc0
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#define DMA_AUTOINIT 0x10
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extern raw_spinlock_t dma_spin_lock;
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static inline unsigned long claim_dma_lock(void)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&dma_spin_lock, flags);
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return flags;
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}
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static inline void release_dma_lock(unsigned long flags)
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{
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raw_spin_unlock_irqrestore(&dma_spin_lock, flags);
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}
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/* Clear the 'DMA Pointer Flip Flop'.
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* Write 0 for LSB/MSB, 1 for MSB/LSB access.
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*/
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#define clear_dma_ff(chan)
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/* Set only the page register bits of the transfer address.
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*
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* NOTE: This is an architecture specific function, and should
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* be hidden from the drivers
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*/
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extern void set_dma_page(unsigned int chan, char pagenr);
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/* Request a DMA channel
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*
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* Some architectures may need to do allocate an interrupt
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*/
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extern int request_dma(unsigned int chan, const char * device_id);
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/* Free a DMA channel
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*
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* Some architectures may need to do free an interrupt
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*/
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extern void free_dma(unsigned int chan);
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/* Enable DMA for this channel
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*
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* On some architectures, this may have other side effects like
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* enabling an interrupt and setting the DMA registers.
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*/
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extern void enable_dma(unsigned int chan);
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/* Disable DMA for this channel
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*
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* On some architectures, this may have other side effects like
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* disabling an interrupt or whatever.
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*/
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extern void disable_dma(unsigned int chan);
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/* Test whether the specified channel has an active DMA transfer
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*/
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extern int dma_channel_active(unsigned int chan);
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/* Set the DMA scatter gather list for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA address immediately, but defer it to the enable_dma().
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*/
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extern void set_dma_sg(unsigned int chan, struct scatterlist *sg, int nr_sg);
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/* Set the DMA address for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA address immediately, but defer it to the enable_dma().
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*/
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extern void __set_dma_addr(unsigned int chan, void *addr);
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#define set_dma_addr(chan, addr) \
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__set_dma_addr(chan, (void *)__bus_to_virt(addr))
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/* Set the DMA byte count for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA count immediately, but defer it to the enable_dma().
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*/
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extern void set_dma_count(unsigned int chan, unsigned long count);
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/* Set the transfer direction for this channel
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*
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* This should not be called if a DMA channel is enabled,
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* especially since some DMA architectures don't update the
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* DMA transfer direction immediately, but defer it to the
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* enable_dma().
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*/
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extern void set_dma_mode(unsigned int chan, unsigned int mode);
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/* Set the transfer speed for this channel
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*/
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extern void set_dma_speed(unsigned int chan, int cycle_ns);
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/* Get DMA residue count. After a DMA transfer, this
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* should return zero. Reading this while a DMA transfer is
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* still in progress will return unpredictable results.
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* If called before the channel has been used, it may return 1.
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* Otherwise, it returns the number of _bytes_ left to transfer.
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*/
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extern int get_dma_residue(unsigned int chan);
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#ifndef NO_DMA
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#define NO_DMA 255
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#endif
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#endif /* CONFIG_ISA_DMA_API */
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#ifdef CONFIG_PCI
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extern int isa_dma_bridge_buggy;
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#else
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#define isa_dma_bridge_buggy (0)
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#endif
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#endif /* __ASM_ARM_DMA_H */
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