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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>
110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Definitions for using the Apple Descriptor-Based DMA controller
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* in Power Macintosh computers.
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*
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* Copyright (C) 1996 Paul Mackerras.
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*/
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#ifdef __KERNEL__
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#ifndef _ASM_DBDMA_H_
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#define _ASM_DBDMA_H_
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/*
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* DBDMA control/status registers. All little-endian.
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*/
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struct dbdma_regs {
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unsigned int control; /* lets you change bits in status */
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unsigned int status; /* DMA and device status bits (see below) */
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unsigned int cmdptr_hi; /* upper 32 bits of command address */
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unsigned int cmdptr; /* (lower 32 bits of) command address (phys) */
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unsigned int intr_sel; /* select interrupt condition bit */
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unsigned int br_sel; /* select branch condition bit */
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unsigned int wait_sel; /* select wait condition bit */
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unsigned int xfer_mode;
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unsigned int data2ptr_hi;
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unsigned int data2ptr;
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unsigned int res1;
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unsigned int address_hi;
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unsigned int br_addr_hi;
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unsigned int res2[3];
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};
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/* Bits in control and status registers */
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#define RUN 0x8000
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#define PAUSE 0x4000
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#define FLUSH 0x2000
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#define WAKE 0x1000
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#define DEAD 0x0800
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#define ACTIVE 0x0400
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#define BT 0x0100
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#define DEVSTAT 0x00ff
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/*
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* DBDMA command structure. These fields are all little-endian!
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*/
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struct dbdma_cmd {
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__le16 req_count; /* requested byte transfer count */
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__le16 command; /* command word (has bit-fields) */
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__le32 phy_addr; /* physical data address */
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__le32 cmd_dep; /* command-dependent field */
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__le16 res_count; /* residual count after completion */
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__le16 xfer_status; /* transfer status */
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};
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/* DBDMA command values in command field */
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#define OUTPUT_MORE 0 /* transfer memory data to stream */
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#define OUTPUT_LAST 0x1000 /* ditto followed by end marker */
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#define INPUT_MORE 0x2000 /* transfer stream data to memory */
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#define INPUT_LAST 0x3000 /* ditto, expect end marker */
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#define STORE_WORD 0x4000 /* write word (4 bytes) to device reg */
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#define LOAD_WORD 0x5000 /* read word (4 bytes) from device reg */
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#define DBDMA_NOP 0x6000 /* do nothing */
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#define DBDMA_STOP 0x7000 /* suspend processing */
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/* Key values in command field */
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#define KEY_STREAM0 0 /* usual data stream */
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#define KEY_STREAM1 0x100 /* control/status stream */
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#define KEY_STREAM2 0x200 /* device-dependent stream */
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#define KEY_STREAM3 0x300 /* device-dependent stream */
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#define KEY_REGS 0x500 /* device register space */
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#define KEY_SYSTEM 0x600 /* system memory-mapped space */
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#define KEY_DEVICE 0x700 /* device memory-mapped space */
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/* Interrupt control values in command field */
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#define INTR_NEVER 0 /* don't interrupt */
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#define INTR_IFSET 0x10 /* intr if condition bit is 1 */
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#define INTR_IFCLR 0x20 /* intr if condition bit is 0 */
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#define INTR_ALWAYS 0x30 /* always interrupt */
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/* Branch control values in command field */
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#define BR_NEVER 0 /* don't branch */
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#define BR_IFSET 0x4 /* branch if condition bit is 1 */
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#define BR_IFCLR 0x8 /* branch if condition bit is 0 */
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#define BR_ALWAYS 0xc /* always branch */
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/* Wait control values in command field */
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#define WAIT_NEVER 0 /* don't wait */
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#define WAIT_IFSET 1 /* wait if condition bit is 1 */
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#define WAIT_IFCLR 2 /* wait if condition bit is 0 */
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#define WAIT_ALWAYS 3 /* always wait */
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/* Align an address for a DBDMA command structure */
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#define DBDMA_ALIGN(x) (((unsigned long)(x) + sizeof(struct dbdma_cmd) - 1) \
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& -sizeof(struct dbdma_cmd))
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/* Useful macros */
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#define DBDMA_DO_STOP(regs) do { \
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out_le32(&((regs)->control), (RUN|FLUSH)<<16); \
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while(in_le32(&((regs)->status)) & (ACTIVE|FLUSH)) \
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; \
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} while(0)
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#define DBDMA_DO_RESET(regs) do { \
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out_le32(&((regs)->control), (ACTIVE|DEAD|WAKE|FLUSH|PAUSE|RUN)<<16);\
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while(in_le32(&((regs)->status)) & (RUN)) \
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; \
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} while(0)
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#endif /* _ASM_DBDMA_H_ */
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#endif /* __KERNEL__ */
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