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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>
241 lines
6.2 KiB
C
241 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* DIAGNOSE X'2C4' instruction based HMC FTP services, useable on z/VM
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*
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* Copyright IBM Corp. 2013
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* Author(s): Ralf Hoppe (rhoppe@de.ibm.com)
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*
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*/
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#define KMSG_COMPONENT "hmcdrv"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/irq.h>
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#include <linux/wait.h>
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#include <linux/string.h>
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#include <asm/ctl_reg.h>
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#include <asm/diag.h>
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#include "hmcdrv_ftp.h"
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#include "diag_ftp.h"
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/* DIAGNOSE X'2C4' return codes in Ry */
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#define DIAG_FTP_RET_OK 0 /* HMC FTP started successfully */
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#define DIAG_FTP_RET_EBUSY 4 /* HMC FTP service currently busy */
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#define DIAG_FTP_RET_EIO 8 /* HMC FTP service I/O error */
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/* and an artificial extension */
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#define DIAG_FTP_RET_EPERM 2 /* HMC FTP service privilege error */
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/* FTP service status codes (after INTR at guest real location 133) */
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#define DIAG_FTP_STAT_OK 0U /* request completed successfully */
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#define DIAG_FTP_STAT_PGCC 4U /* program check condition */
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#define DIAG_FTP_STAT_PGIOE 8U /* paging I/O error */
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#define DIAG_FTP_STAT_TIMEOUT 12U /* timeout */
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#define DIAG_FTP_STAT_EBASE 16U /* base of error codes from SCLP */
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#define DIAG_FTP_STAT_LDFAIL (DIAG_FTP_STAT_EBASE + 1U) /* failed */
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#define DIAG_FTP_STAT_LDNPERM (DIAG_FTP_STAT_EBASE + 2U) /* not allowed */
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#define DIAG_FTP_STAT_LDRUNS (DIAG_FTP_STAT_EBASE + 3U) /* runs */
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#define DIAG_FTP_STAT_LDNRUNS (DIAG_FTP_STAT_EBASE + 4U) /* not runs */
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/**
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* struct diag_ftp_ldfpl - load file FTP parameter list (LDFPL)
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* @bufaddr: real buffer address (at 4k boundary)
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* @buflen: length of buffer
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* @offset: dir/file offset
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* @intparm: interruption parameter (unused)
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* @transferred: bytes transferred
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* @fsize: file size, filled on GET
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* @failaddr: failing address
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* @spare: padding
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* @fident: file name - ASCII
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*/
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struct diag_ftp_ldfpl {
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u64 bufaddr;
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u64 buflen;
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u64 offset;
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u64 intparm;
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u64 transferred;
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u64 fsize;
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u64 failaddr;
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u64 spare;
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u8 fident[HMCDRV_FTP_FIDENT_MAX];
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} __packed;
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static DECLARE_COMPLETION(diag_ftp_rx_complete);
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static int diag_ftp_subcode;
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/**
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* diag_ftp_handler() - FTP services IRQ handler
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* @extirq: external interrupt (sub-) code
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* @param32: 32-bit interruption parameter from &struct diag_ftp_ldfpl
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* @param64: unused (for 64-bit interrupt parameters)
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*/
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static void diag_ftp_handler(struct ext_code extirq,
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unsigned int param32,
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unsigned long param64)
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{
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if ((extirq.subcode >> 8) != 8)
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return; /* not a FTP services sub-code */
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inc_irq_stat(IRQEXT_FTP);
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diag_ftp_subcode = extirq.subcode & 0xffU;
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complete(&diag_ftp_rx_complete);
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}
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/**
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* diag_ftp_2c4() - DIAGNOSE X'2C4' service call
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* @fpl: pointer to prepared LDFPL
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* @cmd: FTP command to be executed
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*
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* Performs a DIAGNOSE X'2C4' call with (input/output) FTP parameter list
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* @fpl and FTP function code @cmd. In case of an error the function does
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* nothing and returns an (negative) error code.
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*
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* Notes:
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* 1. This function only initiates a transfer, so the caller must wait
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* for completion (asynchronous execution).
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* 2. The FTP parameter list @fpl must be aligned to a double-word boundary.
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* 3. fpl->bufaddr must be a real address, 4k aligned
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*/
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static int diag_ftp_2c4(struct diag_ftp_ldfpl *fpl,
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enum hmcdrv_ftp_cmdid cmd)
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{
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int rc;
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diag_stat_inc(DIAG_STAT_X2C4);
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asm volatile(
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" diag %[addr],%[cmd],0x2c4\n"
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"0: j 2f\n"
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"1: la %[rc],%[err]\n"
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"2:\n"
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EX_TABLE(0b, 1b)
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: [rc] "=d" (rc), "+m" (*fpl)
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: [cmd] "0" (cmd), [addr] "d" (virt_to_phys(fpl)),
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[err] "i" (DIAG_FTP_RET_EPERM)
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: "cc");
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switch (rc) {
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case DIAG_FTP_RET_OK:
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return 0;
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case DIAG_FTP_RET_EBUSY:
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return -EBUSY;
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case DIAG_FTP_RET_EPERM:
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return -EPERM;
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case DIAG_FTP_RET_EIO:
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default:
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return -EIO;
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}
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}
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/**
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* diag_ftp_cmd() - executes a DIAG X'2C4' FTP command, targeting a HMC
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* @ftp: pointer to FTP command specification
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* @fsize: return of file size (or NULL if undesirable)
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*
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* Attention: Notice that this function is not reentrant - so the caller
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* must ensure locking.
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*
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* Return: number of bytes read/written or a (negative) error code
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*/
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ssize_t diag_ftp_cmd(const struct hmcdrv_ftp_cmdspec *ftp, size_t *fsize)
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{
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struct diag_ftp_ldfpl *ldfpl;
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ssize_t len;
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#ifdef DEBUG
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unsigned long start_jiffies;
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pr_debug("starting DIAG X'2C4' on '%s', requesting %zd bytes\n",
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ftp->fname, ftp->len);
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start_jiffies = jiffies;
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#endif
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init_completion(&diag_ftp_rx_complete);
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ldfpl = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!ldfpl) {
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len = -ENOMEM;
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goto out;
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}
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len = strlcpy(ldfpl->fident, ftp->fname, sizeof(ldfpl->fident));
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if (len >= HMCDRV_FTP_FIDENT_MAX) {
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len = -EINVAL;
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goto out_free;
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}
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ldfpl->transferred = 0;
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ldfpl->fsize = 0;
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ldfpl->offset = ftp->ofs;
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ldfpl->buflen = ftp->len;
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ldfpl->bufaddr = virt_to_phys(ftp->buf);
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len = diag_ftp_2c4(ldfpl, ftp->id);
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if (len)
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goto out_free;
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/*
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* There is no way to cancel the running diag X'2C4', the code
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* needs to wait unconditionally until the transfer is complete.
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*/
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wait_for_completion(&diag_ftp_rx_complete);
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#ifdef DEBUG
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pr_debug("completed DIAG X'2C4' after %lu ms\n",
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(jiffies - start_jiffies) * 1000 / HZ);
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pr_debug("status of DIAG X'2C4' is %u, with %lld/%lld bytes\n",
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diag_ftp_subcode, ldfpl->transferred, ldfpl->fsize);
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#endif
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switch (diag_ftp_subcode) {
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case DIAG_FTP_STAT_OK: /* success */
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len = ldfpl->transferred;
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if (fsize)
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*fsize = ldfpl->fsize;
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break;
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case DIAG_FTP_STAT_LDNPERM:
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len = -EPERM;
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break;
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case DIAG_FTP_STAT_LDRUNS:
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len = -EBUSY;
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break;
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case DIAG_FTP_STAT_LDFAIL:
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len = -ENOENT; /* no such file or media */
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break;
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default:
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len = -EIO;
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break;
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}
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out_free:
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free_page((unsigned long) ldfpl);
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out:
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return len;
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}
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/**
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* diag_ftp_startup() - startup of FTP services, when running on z/VM
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*
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* Return: 0 on success, else an (negative) error code
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*/
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int diag_ftp_startup(void)
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{
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int rc;
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rc = register_external_irq(EXT_IRQ_CP_SERVICE, diag_ftp_handler);
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if (rc)
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return rc;
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irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL);
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return 0;
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}
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/**
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* diag_ftp_shutdown() - shutdown of FTP services, when running on z/VM
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*/
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void diag_ftp_shutdown(void)
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{
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irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL);
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unregister_external_irq(EXT_IRQ_CP_SERVICE, diag_ftp_handler);
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}
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