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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>
274 lines
6.0 KiB
C
274 lines
6.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* sun4m SMP support.
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*
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* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/clockchips.h>
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#include <linux/interrupt.h>
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#include <linux/profile.h>
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#include <linux/delay.h>
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#include <linux/sched/mm.h>
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#include <linux/cpu.h>
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#include <asm/cacheflush.h>
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#include <asm/switch_to.h>
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#include <asm/tlbflush.h>
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#include <asm/timer.h>
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#include <asm/oplib.h>
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#include "irq.h"
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#include "kernel.h"
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#define IRQ_IPI_SINGLE 12
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#define IRQ_IPI_MASK 13
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#define IRQ_IPI_RESCHED 14
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#define IRQ_CROSS_CALL 15
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static inline unsigned long
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swap_ulong(volatile unsigned long *ptr, unsigned long val)
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{
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__asm__ __volatile__("swap [%1], %0\n\t" :
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"=&r" (val), "=&r" (ptr) :
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"0" (val), "1" (ptr));
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return val;
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}
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void sun4m_cpu_pre_starting(void *arg)
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{
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}
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void sun4m_cpu_pre_online(void *arg)
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{
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int cpuid = hard_smp_processor_id();
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/* Allow master to continue. The master will then give us the
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* go-ahead by setting the smp_commenced_mask and will wait without
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* timeouts until our setup is completed fully (signified by
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* our bit being set in the cpu_online_mask).
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*/
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swap_ulong(&cpu_callin_map[cpuid], 1);
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/* XXX: What's up with all the flushes? */
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local_ops->cache_all();
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local_ops->tlb_all();
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/* Fix idle thread fields. */
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__asm__ __volatile__("ld [%0], %%g6\n\t"
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: : "r" (¤t_set[cpuid])
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: "memory" /* paranoid */);
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/* Attach to the address space of init_task. */
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mmgrab(&init_mm);
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current->active_mm = &init_mm;
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while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
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mb();
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}
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/*
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* Cycle through the processors asking the PROM to start each one.
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*/
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void __init smp4m_boot_cpus(void)
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{
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sun4m_unmask_profile_irq();
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local_ops->cache_all();
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}
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int smp4m_boot_one_cpu(int i, struct task_struct *idle)
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{
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unsigned long *entry = &sun4m_cpu_startup;
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int timeout;
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int cpu_node;
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cpu_find_by_mid(i, &cpu_node);
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current_set[i] = task_thread_info(idle);
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/* See trampoline.S for details... */
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entry += ((i - 1) * 3);
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/*
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* Initialize the contexts table
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* Since the call to prom_startcpu() trashes the structure,
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* we need to re-initialize it for each cpu
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*/
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smp_penguin_ctable.which_io = 0;
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smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
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smp_penguin_ctable.reg_size = 0;
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/* whirrr, whirrr, whirrrrrrrrr... */
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printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
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local_ops->cache_all();
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prom_startcpu(cpu_node, &smp_penguin_ctable, 0, (char *)entry);
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/* wheee... it's going... */
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for (timeout = 0; timeout < 10000; timeout++) {
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if (cpu_callin_map[i])
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break;
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udelay(200);
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}
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if (!(cpu_callin_map[i])) {
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printk(KERN_ERR "Processor %d is stuck.\n", i);
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return -ENODEV;
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}
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local_ops->cache_all();
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return 0;
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}
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void __init smp4m_smp_done(void)
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{
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int i, first;
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int *prev;
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/* setup cpu list for irq rotation */
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first = 0;
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prev = &first;
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for_each_online_cpu(i) {
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*prev = i;
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prev = &cpu_data(i).next;
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}
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*prev = first;
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local_ops->cache_all();
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/* Ok, they are spinning and ready to go. */
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}
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static void sun4m_send_ipi(int cpu, int level)
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{
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sbus_writel(SUN4M_SOFT_INT(level), &sun4m_irq_percpu[cpu]->set);
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}
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static void sun4m_ipi_resched(int cpu)
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{
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sun4m_send_ipi(cpu, IRQ_IPI_RESCHED);
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}
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static void sun4m_ipi_single(int cpu)
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{
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sun4m_send_ipi(cpu, IRQ_IPI_SINGLE);
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}
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static void sun4m_ipi_mask_one(int cpu)
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{
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sun4m_send_ipi(cpu, IRQ_IPI_MASK);
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}
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static struct smp_funcall {
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smpfunc_t func;
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unsigned long arg1;
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unsigned long arg2;
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unsigned long arg3;
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unsigned long arg4;
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unsigned long arg5;
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unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */
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unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
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} ccall_info;
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static DEFINE_SPINLOCK(cross_call_lock);
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/* Cross calls must be serialized, at least currently. */
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static void sun4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
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unsigned long arg2, unsigned long arg3,
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unsigned long arg4)
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{
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register int ncpus = SUN4M_NCPUS;
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unsigned long flags;
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spin_lock_irqsave(&cross_call_lock, flags);
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/* Init function glue. */
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ccall_info.func = func;
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ccall_info.arg1 = arg1;
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ccall_info.arg2 = arg2;
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ccall_info.arg3 = arg3;
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ccall_info.arg4 = arg4;
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ccall_info.arg5 = 0;
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/* Init receive/complete mapping, plus fire the IPI's off. */
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{
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register int i;
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cpumask_clear_cpu(smp_processor_id(), &mask);
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cpumask_and(&mask, cpu_online_mask, &mask);
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for (i = 0; i < ncpus; i++) {
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if (cpumask_test_cpu(i, &mask)) {
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ccall_info.processors_in[i] = 0;
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ccall_info.processors_out[i] = 0;
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sun4m_send_ipi(i, IRQ_CROSS_CALL);
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} else {
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ccall_info.processors_in[i] = 1;
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ccall_info.processors_out[i] = 1;
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}
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}
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}
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{
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register int i;
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i = 0;
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do {
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if (!cpumask_test_cpu(i, &mask))
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continue;
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while (!ccall_info.processors_in[i])
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barrier();
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} while (++i < ncpus);
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i = 0;
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do {
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if (!cpumask_test_cpu(i, &mask))
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continue;
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while (!ccall_info.processors_out[i])
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barrier();
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} while (++i < ncpus);
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}
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spin_unlock_irqrestore(&cross_call_lock, flags);
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}
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/* Running cross calls. */
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void smp4m_cross_call_irq(void)
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{
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int i = smp_processor_id();
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ccall_info.processors_in[i] = 1;
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ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
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ccall_info.arg4, ccall_info.arg5);
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ccall_info.processors_out[i] = 1;
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}
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void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
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{
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struct pt_regs *old_regs;
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struct clock_event_device *ce;
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int cpu = smp_processor_id();
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old_regs = set_irq_regs(regs);
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ce = &per_cpu(sparc32_clockevent, cpu);
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if (clockevent_state_periodic(ce))
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sun4m_clear_profile_irq(cpu);
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else
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sparc_config.load_profile_irq(cpu, 0); /* Is this needless? */
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irq_enter();
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ce->event_handler(ce);
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irq_exit();
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set_irq_regs(old_regs);
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}
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static const struct sparc32_ipi_ops sun4m_ipi_ops = {
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.cross_call = sun4m_cross_call,
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.resched = sun4m_ipi_resched,
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.single = sun4m_ipi_single,
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.mask_one = sun4m_ipi_mask_one,
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};
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void __init sun4m_init_smp(void)
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{
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sparc32_ipi_ops = &sun4m_ipi_ops;
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}
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