[MIPS] Move FPU affinity code into separate file.
Gets rid of some of the CONFIG_MIPS_MT_FPAFF #ifdefery. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle
Ralf Baechle
parent
5ddcb3c35b
commit
295cbf6d63
@ -37,6 +37,7 @@ obj-$(CONFIG_CPU_VR41XX) += r4k_fpu.o r4k_switch.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_MIPS_MT) += mips-mt.o
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obj-$(CONFIG_MIPS_MT_FPAFF) += mips-mt-fpaff.o
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obj-$(CONFIG_MIPS_MT_SMTC) += smtc.o smtc-asm.o smtc-proc.o
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obj-$(CONFIG_MIPS_MT_SMP) += smp-mt.o
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176
arch/mips/kernel/mips-mt-fpaff.c
Normal file
176
arch/mips/kernel/mips-mt-fpaff.c
Normal file
@ -0,0 +1,176 @@
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/*
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* General MIPS MT support routines, usable in AP/SP, SMVP, or SMTC kernels
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* Copyright (C) 2005 Mips Technologies, Inc
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*/
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#include <linux/cpu.h>
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#include <linux/cpumask.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/security.h>
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#include <linux/types.h>
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#include <asm/uaccess.h>
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/*
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* CPU mask used to set process affinity for MT VPEs/TCs with FPUs
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*/
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cpumask_t mt_fpu_cpumask;
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static int fpaff_threshold = -1;
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unsigned long mt_fpemul_threshold = 0;
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/*
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* Replacement functions for the sys_sched_setaffinity() and
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* sys_sched_getaffinity() system calls, so that we can integrate
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* FPU affinity with the user's requested processor affinity.
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* This code is 98% identical with the sys_sched_setaffinity()
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* and sys_sched_getaffinity() system calls, and should be
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* updated when kernel/sched.c changes.
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*/
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/*
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* find_process_by_pid - find a process with a matching PID value.
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* used in sys_sched_set/getaffinity() in kernel/sched.c, so
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* cloned here.
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*/
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static inline struct task_struct *find_process_by_pid(pid_t pid)
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{
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return pid ? find_task_by_pid(pid) : current;
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}
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/*
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* mipsmt_sys_sched_setaffinity - set the cpu affinity of a process
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*/
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asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
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unsigned long __user *user_mask_ptr)
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{
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cpumask_t new_mask;
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cpumask_t effective_mask;
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int retval;
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struct task_struct *p;
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if (len < sizeof(new_mask))
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return -EINVAL;
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if (copy_from_user(&new_mask, user_mask_ptr, sizeof(new_mask)))
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return -EFAULT;
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lock_cpu_hotplug();
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read_lock(&tasklist_lock);
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p = find_process_by_pid(pid);
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if (!p) {
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read_unlock(&tasklist_lock);
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unlock_cpu_hotplug();
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return -ESRCH;
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}
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/*
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* It is not safe to call set_cpus_allowed with the
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* tasklist_lock held. We will bump the task_struct's
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* usage count and drop tasklist_lock before invoking
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* set_cpus_allowed.
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*/
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get_task_struct(p);
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retval = -EPERM;
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if ((current->euid != p->euid) && (current->euid != p->uid) &&
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!capable(CAP_SYS_NICE)) {
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read_unlock(&tasklist_lock);
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goto out_unlock;
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}
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retval = security_task_setscheduler(p, 0, NULL);
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if (retval)
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goto out_unlock;
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/* Record new user-specified CPU set for future reference */
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p->thread.user_cpus_allowed = new_mask;
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/* Unlock the task list */
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read_unlock(&tasklist_lock);
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/* Compute new global allowed CPU set if necessary */
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if ((p->thread.mflags & MF_FPUBOUND)
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&& cpus_intersects(new_mask, mt_fpu_cpumask)) {
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cpus_and(effective_mask, new_mask, mt_fpu_cpumask);
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retval = set_cpus_allowed(p, effective_mask);
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} else {
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p->thread.mflags &= ~MF_FPUBOUND;
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retval = set_cpus_allowed(p, new_mask);
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}
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out_unlock:
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put_task_struct(p);
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unlock_cpu_hotplug();
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return retval;
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}
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/*
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* mipsmt_sys_sched_getaffinity - get the cpu affinity of a process
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*/
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asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len,
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unsigned long __user *user_mask_ptr)
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{
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unsigned int real_len;
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cpumask_t mask;
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int retval;
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struct task_struct *p;
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real_len = sizeof(mask);
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if (len < real_len)
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return -EINVAL;
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lock_cpu_hotplug();
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read_lock(&tasklist_lock);
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retval = -ESRCH;
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p = find_process_by_pid(pid);
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if (!p)
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goto out_unlock;
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retval = security_task_getscheduler(p);
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if (retval)
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goto out_unlock;
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cpus_and(mask, p->thread.user_cpus_allowed, cpu_possible_map);
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out_unlock:
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read_unlock(&tasklist_lock);
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unlock_cpu_hotplug();
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if (retval)
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return retval;
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if (copy_to_user(user_mask_ptr, &mask, real_len))
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return -EFAULT;
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return real_len;
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}
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static int __init fpaff_thresh(char *str)
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{
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get_option(&str, &fpaff_threshold);
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return 1;
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}
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__setup("fpaff=", fpaff_thresh);
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/*
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* FPU Use Factor empirically derived from experiments on 34K
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*/
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#define FPUSEFACTOR 333
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static __init int mt_fp_affinity_init(void)
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{
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if (fpaff_threshold >= 0) {
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mt_fpemul_threshold = fpaff_threshold;
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} else {
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mt_fpemul_threshold =
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(FPUSEFACTOR * (loops_per_jiffy/(500000/HZ))) / HZ;
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}
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printk(KERN_DEBUG "FPU Affinity set after %ld emulations\n",
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mt_fpemul_threshold);
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return 0;
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}
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arch_initcall(mt_fp_affinity_init);
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@ -6,7 +6,6 @@
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/cpumask.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/security.h>
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@ -22,149 +21,6 @@
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#include <asm/r4kcache.h>
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#include <asm/cacheflush.h>
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/*
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* CPU mask used to set process affinity for MT VPEs/TCs with FPUs
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*/
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cpumask_t mt_fpu_cpumask;
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#ifdef CONFIG_MIPS_MT_FPAFF
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#include <linux/cpu.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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unsigned long mt_fpemul_threshold = 0;
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/*
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* Replacement functions for the sys_sched_setaffinity() and
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* sys_sched_getaffinity() system calls, so that we can integrate
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* FPU affinity with the user's requested processor affinity.
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* This code is 98% identical with the sys_sched_setaffinity()
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* and sys_sched_getaffinity() system calls, and should be
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* updated when kernel/sched.c changes.
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*/
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/*
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* find_process_by_pid - find a process with a matching PID value.
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* used in sys_sched_set/getaffinity() in kernel/sched.c, so
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* cloned here.
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*/
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static inline struct task_struct *find_process_by_pid(pid_t pid)
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{
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return pid ? find_task_by_pid(pid) : current;
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}
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/*
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* mipsmt_sys_sched_setaffinity - set the cpu affinity of a process
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*/
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asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len,
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unsigned long __user *user_mask_ptr)
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{
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cpumask_t new_mask;
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cpumask_t effective_mask;
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int retval;
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struct task_struct *p;
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if (len < sizeof(new_mask))
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return -EINVAL;
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if (copy_from_user(&new_mask, user_mask_ptr, sizeof(new_mask)))
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return -EFAULT;
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lock_cpu_hotplug();
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read_lock(&tasklist_lock);
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p = find_process_by_pid(pid);
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if (!p) {
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read_unlock(&tasklist_lock);
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unlock_cpu_hotplug();
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return -ESRCH;
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}
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/*
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* It is not safe to call set_cpus_allowed with the
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* tasklist_lock held. We will bump the task_struct's
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* usage count and drop tasklist_lock before invoking
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* set_cpus_allowed.
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*/
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get_task_struct(p);
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retval = -EPERM;
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if ((current->euid != p->euid) && (current->euid != p->uid) &&
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!capable(CAP_SYS_NICE)) {
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read_unlock(&tasklist_lock);
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goto out_unlock;
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}
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retval = security_task_setscheduler(p, 0, NULL);
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if (retval)
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goto out_unlock;
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/* Record new user-specified CPU set for future reference */
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p->thread.user_cpus_allowed = new_mask;
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/* Unlock the task list */
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read_unlock(&tasklist_lock);
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/* Compute new global allowed CPU set if necessary */
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if ((p->thread.mflags & MF_FPUBOUND)
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&& cpus_intersects(new_mask, mt_fpu_cpumask)) {
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cpus_and(effective_mask, new_mask, mt_fpu_cpumask);
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retval = set_cpus_allowed(p, effective_mask);
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} else {
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p->thread.mflags &= ~MF_FPUBOUND;
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retval = set_cpus_allowed(p, new_mask);
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}
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out_unlock:
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put_task_struct(p);
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unlock_cpu_hotplug();
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return retval;
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}
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/*
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* mipsmt_sys_sched_getaffinity - get the cpu affinity of a process
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*/
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asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len,
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unsigned long __user *user_mask_ptr)
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{
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unsigned int real_len;
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cpumask_t mask;
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int retval;
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struct task_struct *p;
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real_len = sizeof(mask);
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if (len < real_len)
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return -EINVAL;
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lock_cpu_hotplug();
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read_lock(&tasklist_lock);
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retval = -ESRCH;
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p = find_process_by_pid(pid);
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if (!p)
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goto out_unlock;
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retval = security_task_getscheduler(p);
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if (retval)
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goto out_unlock;
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cpus_and(mask, p->thread.user_cpus_allowed, cpu_possible_map);
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out_unlock:
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read_unlock(&tasklist_lock);
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unlock_cpu_hotplug();
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if (retval)
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return retval;
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if (copy_to_user(user_mask_ptr, &mask, real_len))
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return -EFAULT;
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return real_len;
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}
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#endif /* CONFIG_MIPS_MT_FPAFF */
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/*
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* Dump new MIPS MT state for the core. Does not leave TCs halted.
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* Takes an argument which taken to be a pre-call MVPControl value.
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@ -314,17 +170,6 @@ static int __init ndflush(char *s)
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return 1;
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}
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__setup("ndflush=", ndflush);
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#ifdef CONFIG_MIPS_MT_FPAFF
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static int fpaff_threshold = -1;
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static int __init fpaff_thresh(char *str)
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{
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get_option(&str, &fpaff_threshold);
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return 1;
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}
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__setup("fpaff=", fpaff_thresh);
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#endif /* CONFIG_MIPS_MT_FPAFF */
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static unsigned int itc_base = 0;
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@ -380,20 +225,6 @@ void mips_mt_set_cpuoptions(void)
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if (mt_n_dflushes != 1)
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printk("D-Cache Flushes Repeated %d times\n", mt_n_dflushes);
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#ifdef CONFIG_MIPS_MT_FPAFF
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/* FPU Use Factor empirically derived from experiments on 34K */
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#define FPUSEFACTOR 333
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if (fpaff_threshold >= 0) {
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mt_fpemul_threshold = fpaff_threshold;
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} else {
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mt_fpemul_threshold =
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(FPUSEFACTOR * (loops_per_jiffy / (500000 / HZ))) / HZ;
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}
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printk("FPU Affinity set after %ld emulations\n",
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mt_fpemul_threshold);
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#endif /* CONFIG_MIPS_MT_FPAFF */
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if (itc_base != 0) {
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/*
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* Configure ITC mapping. This code is very
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