diff options
Diffstat (limited to 'arch/mips/kernel/mips-mt.c')
| -rw-r--r-- | arch/mips/kernel/mips-mt.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/arch/mips/kernel/mips-mt.c b/arch/mips/kernel/mips-mt.c index b1b994dd41db..1a7d89231299 100644 --- a/arch/mips/kernel/mips-mt.c +++ b/arch/mips/kernel/mips-mt.c @@ -6,7 +6,6 @@ #include <linux/device.h> #include <linux/kernel.h> #include <linux/sched.h> -#include <linux/cpumask.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/security.h> @@ -23,149 +22,6 @@ #include <asm/cacheflush.h> /* - * CPU mask used to set process affinity for MT VPEs/TCs with FPUs - */ - -cpumask_t mt_fpu_cpumask; - -#ifdef CONFIG_MIPS_MT_FPAFF - -#include <linux/cpu.h> -#include <linux/delay.h> -#include <asm/uaccess.h> - -unsigned long mt_fpemul_threshold = 0; - -/* - * Replacement functions for the sys_sched_setaffinity() and - * sys_sched_getaffinity() system calls, so that we can integrate - * FPU affinity with the user's requested processor affinity. - * This code is 98% identical with the sys_sched_setaffinity() - * and sys_sched_getaffinity() system calls, and should be - * updated when kernel/sched.c changes. - */ - -/* - * find_process_by_pid - find a process with a matching PID value. - * used in sys_sched_set/getaffinity() in kernel/sched.c, so - * cloned here. - */ -static inline struct task_struct *find_process_by_pid(pid_t pid) -{ - return pid ? find_task_by_pid(pid) : current; -} - - -/* - * mipsmt_sys_sched_setaffinity - set the cpu affinity of a process - */ -asmlinkage long mipsmt_sys_sched_setaffinity(pid_t pid, unsigned int len, - unsigned long __user *user_mask_ptr) -{ - cpumask_t new_mask; - cpumask_t effective_mask; - int retval; - struct task_struct *p; - - if (len < sizeof(new_mask)) - return -EINVAL; - - if (copy_from_user(&new_mask, user_mask_ptr, sizeof(new_mask))) - return -EFAULT; - - lock_cpu_hotplug(); - read_lock(&tasklist_lock); - - p = find_process_by_pid(pid); - if (!p) { - read_unlock(&tasklist_lock); - unlock_cpu_hotplug(); - return -ESRCH; - } - - /* - * It is not safe to call set_cpus_allowed with the - * tasklist_lock held. We will bump the task_struct's - * usage count and drop tasklist_lock before invoking - * set_cpus_allowed. - */ - get_task_struct(p); - - retval = -EPERM; - if ((current->euid != p->euid) && (current->euid != p->uid) && - !capable(CAP_SYS_NICE)) { - read_unlock(&tasklist_lock); - goto out_unlock; - } - - retval = security_task_setscheduler(p, 0, NULL); - if (retval) - goto out_unlock; - - /* Record new user-specified CPU set for future reference */ - p->thread.user_cpus_allowed = new_mask; - - /* Unlock the task list */ - read_unlock(&tasklist_lock); - - /* Compute new global allowed CPU set if necessary */ - if ((p->thread.mflags & MF_FPUBOUND) - && cpus_intersects(new_mask, mt_fpu_cpumask)) { - cpus_and(effective_mask, new_mask, mt_fpu_cpumask); - retval = set_cpus_allowed(p, effective_mask); - } else { - p->thread.mflags &= ~MF_FPUBOUND; - retval = set_cpus_allowed(p, new_mask); - } - - -out_unlock: - put_task_struct(p); - unlock_cpu_hotplug(); - return retval; -} - -/* - * mipsmt_sys_sched_getaffinity - get the cpu affinity of a process - */ -asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len, - unsigned long __user *user_mask_ptr) -{ - unsigned int real_len; - cpumask_t mask; - int retval; - struct task_struct *p; - - real_len = sizeof(mask); - if (len < real_len) - return -EINVAL; - - lock_cpu_hotplug(); - read_lock(&tasklist_lock); - - retval = -ESRCH; - p = find_process_by_pid(pid); - if (!p) - goto out_unlock; - retval = security_task_getscheduler(p); - if (retval) - goto out_unlock; - - cpus_and(mask, p->thread.user_cpus_allowed, cpu_possible_map); - -out_unlock: - read_unlock(&tasklist_lock); - unlock_cpu_hotplug(); - if (retval) - return retval; - if (copy_to_user(user_mask_ptr, &mask, real_len)) - return -EFAULT; - return real_len; -} - -#endif /* CONFIG_MIPS_MT_FPAFF */ - -/* * Dump new MIPS MT state for the core. Does not leave TCs halted. * Takes an argument which taken to be a pre-call MVPControl value. */ @@ -314,17 +170,6 @@ static int __init ndflush(char *s) return 1; } __setup("ndflush=", ndflush); -#ifdef CONFIG_MIPS_MT_FPAFF -static int fpaff_threshold = -1; - -static int __init fpaff_thresh(char *str) -{ - get_option(&str, &fpaff_threshold); - return 1; -} - -__setup("fpaff=", fpaff_thresh); -#endif /* CONFIG_MIPS_MT_FPAFF */ static unsigned int itc_base = 0; @@ -380,20 +225,6 @@ void mips_mt_set_cpuoptions(void) if (mt_n_dflushes != 1) printk("D-Cache Flushes Repeated %d times\n", mt_n_dflushes); -#ifdef CONFIG_MIPS_MT_FPAFF - /* FPU Use Factor empirically derived from experiments on 34K */ -#define FPUSEFACTOR 333 - - if (fpaff_threshold >= 0) { - mt_fpemul_threshold = fpaff_threshold; - } else { - mt_fpemul_threshold = - (FPUSEFACTOR * (loops_per_jiffy / (500000 / HZ))) / HZ; - } - printk("FPU Affinity set after %ld emulations\n", - mt_fpemul_threshold); -#endif /* CONFIG_MIPS_MT_FPAFF */ - if (itc_base != 0) { /* * Configure ITC mapping. This code is very |