mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 09:56:39 +07:00
5a0e3ad6af
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
465 lines
9.4 KiB
C
465 lines
9.4 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Copyright 2003 PathScale, Inc.
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* Licensed under the GPL
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*/
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#include <linux/stddef.h>
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#include <linux/err.h>
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#include <linux/hardirq.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/proc_fs.h>
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#include <linux/ptrace.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/tick.h>
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#include <linux/threads.h>
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#include <asm/current.h>
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#include <asm/pgtable.h>
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#include <asm/uaccess.h>
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#include "as-layout.h"
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#include "kern_util.h"
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#include "os.h"
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#include "skas.h"
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#include "tlb.h"
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/*
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* This is a per-cpu array. A processor only modifies its entry and it only
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* cares about its entry, so it's OK if another processor is modifying its
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* entry.
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*/
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struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
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static inline int external_pid(void)
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{
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/* FIXME: Need to look up userspace_pid by cpu */
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return userspace_pid[0];
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}
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int pid_to_processor_id(int pid)
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{
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int i;
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for (i = 0; i < ncpus; i++) {
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if (cpu_tasks[i].pid == pid)
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return i;
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}
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return -1;
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}
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void free_stack(unsigned long stack, int order)
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{
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free_pages(stack, order);
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}
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unsigned long alloc_stack(int order, int atomic)
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{
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unsigned long page;
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gfp_t flags = GFP_KERNEL;
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if (atomic)
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flags = GFP_ATOMIC;
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page = __get_free_pages(flags, order);
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return page;
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}
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int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
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{
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int pid;
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current->thread.request.u.thread.proc = fn;
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current->thread.request.u.thread.arg = arg;
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pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,
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¤t->thread.regs, 0, NULL, NULL);
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return pid;
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}
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static inline void set_current(struct task_struct *task)
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{
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cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
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{ external_pid(), task });
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}
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extern void arch_switch_to(struct task_struct *to);
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void *_switch_to(void *prev, void *next, void *last)
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{
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struct task_struct *from = prev;
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struct task_struct *to = next;
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to->thread.prev_sched = from;
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set_current(to);
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do {
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current->thread.saved_task = NULL;
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switch_threads(&from->thread.switch_buf,
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&to->thread.switch_buf);
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arch_switch_to(current);
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if (current->thread.saved_task)
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show_regs(&(current->thread.regs));
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to = current->thread.saved_task;
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from = current;
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} while (current->thread.saved_task);
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return current->thread.prev_sched;
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}
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void interrupt_end(void)
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{
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if (need_resched())
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schedule();
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if (test_tsk_thread_flag(current, TIF_SIGPENDING))
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do_signal();
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}
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void exit_thread(void)
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{
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}
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void *get_current(void)
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{
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return current;
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}
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/*
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* This is called magically, by its address being stuffed in a jmp_buf
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* and being longjmp-d to.
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*/
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void new_thread_handler(void)
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{
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int (*fn)(void *), n;
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void *arg;
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if (current->thread.prev_sched != NULL)
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schedule_tail(current->thread.prev_sched);
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current->thread.prev_sched = NULL;
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fn = current->thread.request.u.thread.proc;
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arg = current->thread.request.u.thread.arg;
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/*
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* The return value is 1 if the kernel thread execs a process,
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* 0 if it just exits
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*/
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n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf);
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if (n == 1) {
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/* Handle any immediate reschedules or signals */
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interrupt_end();
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userspace(¤t->thread.regs.regs);
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}
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else do_exit(0);
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}
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/* Called magically, see new_thread_handler above */
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void fork_handler(void)
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{
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force_flush_all();
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schedule_tail(current->thread.prev_sched);
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/*
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* XXX: if interrupt_end() calls schedule, this call to
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* arch_switch_to isn't needed. We could want to apply this to
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* improve performance. -bb
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*/
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arch_switch_to(current);
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current->thread.prev_sched = NULL;
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/* Handle any immediate reschedules or signals */
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interrupt_end();
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userspace(¤t->thread.regs.regs);
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}
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int copy_thread(unsigned long clone_flags, unsigned long sp,
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unsigned long stack_top, struct task_struct * p,
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struct pt_regs *regs)
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{
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void (*handler)(void);
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int ret = 0;
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p->thread = (struct thread_struct) INIT_THREAD;
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if (current->thread.forking) {
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memcpy(&p->thread.regs.regs, ®s->regs,
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sizeof(p->thread.regs.regs));
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REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.gp, 0);
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if (sp != 0)
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REGS_SP(p->thread.regs.regs.gp) = sp;
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handler = fork_handler;
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arch_copy_thread(¤t->thread.arch, &p->thread.arch);
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}
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else {
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get_safe_registers(p->thread.regs.regs.gp);
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p->thread.request.u.thread = current->thread.request.u.thread;
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handler = new_thread_handler;
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}
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new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
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if (current->thread.forking) {
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clear_flushed_tls(p);
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/*
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* Set a new TLS for the child thread?
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*/
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if (clone_flags & CLONE_SETTLS)
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ret = arch_copy_tls(p);
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}
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return ret;
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}
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void initial_thread_cb(void (*proc)(void *), void *arg)
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{
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int save_kmalloc_ok = kmalloc_ok;
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kmalloc_ok = 0;
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initial_thread_cb_skas(proc, arg);
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kmalloc_ok = save_kmalloc_ok;
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}
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void default_idle(void)
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{
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unsigned long long nsecs;
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while (1) {
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/* endless idle loop with no priority at all */
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/*
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* although we are an idle CPU, we do not want to
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* get into the scheduler unnecessarily.
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*/
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if (need_resched())
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schedule();
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tick_nohz_stop_sched_tick(1);
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nsecs = disable_timer();
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idle_sleep(nsecs);
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tick_nohz_restart_sched_tick();
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}
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}
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void cpu_idle(void)
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{
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cpu_tasks[current_thread_info()->cpu].pid = os_getpid();
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default_idle();
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}
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int __cant_sleep(void) {
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return in_atomic() || irqs_disabled() || in_interrupt();
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/* Is in_interrupt() really needed? */
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}
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int user_context(unsigned long sp)
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{
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unsigned long stack;
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stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
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return stack != (unsigned long) current_thread_info();
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}
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extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
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void do_uml_exitcalls(void)
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{
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exitcall_t *call;
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call = &__uml_exitcall_end;
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while (--call >= &__uml_exitcall_begin)
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(*call)();
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}
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char *uml_strdup(const char *string)
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{
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return kstrdup(string, GFP_KERNEL);
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}
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int copy_to_user_proc(void __user *to, void *from, int size)
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{
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return copy_to_user(to, from, size);
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}
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int copy_from_user_proc(void *to, void __user *from, int size)
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{
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return copy_from_user(to, from, size);
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}
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int clear_user_proc(void __user *buf, int size)
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{
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return clear_user(buf, size);
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}
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int strlen_user_proc(char __user *str)
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{
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return strlen_user(str);
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}
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int smp_sigio_handler(void)
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{
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#ifdef CONFIG_SMP
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int cpu = current_thread_info()->cpu;
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IPI_handler(cpu);
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if (cpu != 0)
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return 1;
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#endif
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return 0;
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}
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int cpu(void)
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{
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return current_thread_info()->cpu;
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}
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static atomic_t using_sysemu = ATOMIC_INIT(0);
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int sysemu_supported;
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void set_using_sysemu(int value)
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{
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if (value > sysemu_supported)
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return;
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atomic_set(&using_sysemu, value);
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}
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int get_using_sysemu(void)
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{
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return atomic_read(&using_sysemu);
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}
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static int sysemu_proc_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "%d\n", get_using_sysemu());
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return 0;
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}
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static int sysemu_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, sysemu_proc_show, NULL);
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}
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static ssize_t sysemu_proc_write(struct file *file, const char __user *buf,
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size_t count, loff_t *pos)
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{
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char tmp[2];
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if (copy_from_user(tmp, buf, 1))
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return -EFAULT;
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if (tmp[0] >= '0' && tmp[0] <= '2')
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set_using_sysemu(tmp[0] - '0');
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/* We use the first char, but pretend to write everything */
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return count;
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}
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static const struct file_operations sysemu_proc_fops = {
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.owner = THIS_MODULE,
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.open = sysemu_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = sysemu_proc_write,
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};
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int __init make_proc_sysemu(void)
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{
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struct proc_dir_entry *ent;
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if (!sysemu_supported)
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return 0;
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ent = proc_create("sysemu", 0600, NULL, &sysemu_proc_fops);
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if (ent == NULL)
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{
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printk(KERN_WARNING "Failed to register /proc/sysemu\n");
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return 0;
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}
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return 0;
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}
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late_initcall(make_proc_sysemu);
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int singlestepping(void * t)
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{
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struct task_struct *task = t ? t : current;
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if (!(task->ptrace & PT_DTRACE))
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return 0;
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if (task->thread.singlestep_syscall)
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return 1;
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return 2;
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}
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/*
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* Only x86 and x86_64 have an arch_align_stack().
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* All other arches have "#define arch_align_stack(x) (x)"
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* in their asm/system.h
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* As this is included in UML from asm-um/system-generic.h,
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* we can use it to behave as the subarch does.
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*/
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#ifndef arch_align_stack
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unsigned long arch_align_stack(unsigned long sp)
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{
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if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
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sp -= get_random_int() % 8192;
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return sp & ~0xf;
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}
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#endif
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unsigned long get_wchan(struct task_struct *p)
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{
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unsigned long stack_page, sp, ip;
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bool seen_sched = 0;
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if ((p == NULL) || (p == current) || (p->state == TASK_RUNNING))
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return 0;
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stack_page = (unsigned long) task_stack_page(p);
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/* Bail if the process has no kernel stack for some reason */
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if (stack_page == 0)
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return 0;
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sp = p->thread.switch_buf->JB_SP;
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/*
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* Bail if the stack pointer is below the bottom of the kernel
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* stack for some reason
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*/
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if (sp < stack_page)
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return 0;
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while (sp < stack_page + THREAD_SIZE) {
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ip = *((unsigned long *) sp);
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if (in_sched_functions(ip))
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/* Ignore everything until we're above the scheduler */
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seen_sched = 1;
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else if (kernel_text_address(ip) && seen_sched)
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return ip;
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sp += sizeof(unsigned long);
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}
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return 0;
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}
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int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
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{
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int cpu = current_thread_info()->cpu;
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return save_fp_registers(userspace_pid[cpu], (unsigned long *) fpu);
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}
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