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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
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>
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2005-2006 by Texas Instruments */
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#ifndef _CPPI_DMA_H_
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#define _CPPI_DMA_H_
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/dmapool.h>
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#include <linux/dmaengine.h>
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#include "musb_core.h"
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#include "musb_dma.h"
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/* CPPI RX/TX state RAM */
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struct cppi_tx_stateram {
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u32 tx_head; /* "DMA packet" head descriptor */
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u32 tx_buf;
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u32 tx_current; /* current descriptor */
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u32 tx_buf_current;
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u32 tx_info; /* flags, remaining buflen */
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u32 tx_rem_len;
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u32 tx_dummy; /* unused */
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u32 tx_complete;
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};
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struct cppi_rx_stateram {
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u32 rx_skipbytes;
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u32 rx_head;
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u32 rx_sop; /* "DMA packet" head descriptor */
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u32 rx_current; /* current descriptor */
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u32 rx_buf_current;
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u32 rx_len_len;
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u32 rx_cnt_cnt;
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u32 rx_complete;
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};
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/* hw_options bits in CPPI buffer descriptors */
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#define CPPI_SOP_SET ((u32)(1 << 31))
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#define CPPI_EOP_SET ((u32)(1 << 30))
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#define CPPI_OWN_SET ((u32)(1 << 29)) /* owned by cppi */
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#define CPPI_EOQ_MASK ((u32)(1 << 28))
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#define CPPI_ZERO_SET ((u32)(1 << 23)) /* rx saw zlp; tx issues one */
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#define CPPI_RXABT_MASK ((u32)(1 << 19)) /* need more rx buffers */
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#define CPPI_RECV_PKTLEN_MASK 0xFFFF
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#define CPPI_BUFFER_LEN_MASK 0xFFFF
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#define CPPI_TEAR_READY ((u32)(1 << 31))
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/* CPPI data structure definitions */
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#define CPPI_DESCRIPTOR_ALIGN 16 /* bytes; 5-dec docs say 4-byte align */
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struct cppi_descriptor {
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/* hardware overlay */
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u32 hw_next; /* next buffer descriptor Pointer */
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u32 hw_bufp; /* i/o buffer pointer */
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u32 hw_off_len; /* buffer_offset16, buffer_length16 */
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u32 hw_options; /* flags: SOP, EOP etc*/
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struct cppi_descriptor *next;
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dma_addr_t dma; /* address of this descriptor */
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u32 buflen; /* for RX: original buffer length */
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} __attribute__ ((aligned(CPPI_DESCRIPTOR_ALIGN)));
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struct cppi;
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/* CPPI Channel Control structure */
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struct cppi_channel {
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struct dma_channel channel;
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/* back pointer to the DMA controller structure */
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struct cppi *controller;
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/* which direction of which endpoint? */
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struct musb_hw_ep *hw_ep;
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bool transmit;
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u8 index;
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/* DMA modes: RNDIS or "transparent" */
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u8 is_rndis;
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/* book keeping for current transfer request */
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dma_addr_t buf_dma;
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u32 buf_len;
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u32 maxpacket;
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u32 offset; /* dma requested */
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void __iomem *state_ram; /* CPPI state */
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struct cppi_descriptor *freelist;
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/* BD management fields */
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struct cppi_descriptor *head;
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struct cppi_descriptor *tail;
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struct cppi_descriptor *last_processed;
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/* use tx_complete in host role to track endpoints waiting for
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* FIFONOTEMPTY to clear.
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*/
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struct list_head tx_complete;
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};
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/* CPPI DMA controller object */
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struct cppi {
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struct dma_controller controller;
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void __iomem *mregs; /* Mentor regs */
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void __iomem *tibase; /* TI/CPPI regs */
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int irq;
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struct cppi_channel tx[4];
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struct cppi_channel rx[4];
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struct dma_pool *pool;
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struct list_head tx_complete;
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};
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/* CPPI IRQ handler */
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extern irqreturn_t cppi_interrupt(int, void *);
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struct cppi41_dma_channel {
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struct dma_channel channel;
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struct cppi41_dma_controller *controller;
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struct musb_hw_ep *hw_ep;
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struct dma_chan *dc;
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dma_cookie_t cookie;
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u8 port_num;
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u8 is_tx;
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u8 is_allocated;
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u8 usb_toggle;
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dma_addr_t buf_addr;
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u32 total_len;
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u32 prog_len;
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u32 transferred;
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u32 packet_sz;
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struct list_head tx_check;
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int tx_zlp;
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};
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#endif /* end of ifndef _CPPI_DMA_H_ */
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