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sparc64: Kill off old sys_perfctr system call and state.

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People should be using the perf events interfaces, and
the way these system call facilities used the %pcr conflicts
with the usage of the NMI watchdog and perf events.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-03-03 08:08:49 -08:00
parent 6c5ae5b278
commit c7d5a00507
12 changed files with 18 additions and 247 deletions
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104
arch/sparc/kernel/sys_sparc_64.c
View file

@ -27,7 +27,6 @@
#include <asm/uaccess.h>
#include <asm/utrap.h>
#include <asm/perfctr.h>
#include <asm/unistd.h>
#include "entry.h"
@ -766,109 +765,6 @@ SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
return ret;
}
/* Invoked by rtrap code to update performance counters in
* user space.
*/
asmlinkage void update_perfctrs(void)
{
unsigned long pic, tmp;
read_pic(pic);
tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
__put_user(tmp, current_thread_info()->user_cntd0);
tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
__put_user(tmp, current_thread_info()->user_cntd1);
reset_pic();
}
SYSCALL_DEFINE4(perfctr, int, opcode, unsigned long, arg0,
unsigned long, arg1, unsigned long, arg2)
{
int err = 0;
switch(opcode) {
case PERFCTR_ON:
current_thread_info()->pcr_reg = arg2;
current_thread_info()->user_cntd0 = (u64 __user *) arg0;
current_thread_info()->user_cntd1 = (u64 __user *) arg1;
current_thread_info()->kernel_cntd0 =
current_thread_info()->kernel_cntd1 = 0;
write_pcr(arg2);
reset_pic();
set_thread_flag(TIF_PERFCTR);
break;
case PERFCTR_OFF:
err = -EINVAL;
if (test_thread_flag(TIF_PERFCTR)) {
current_thread_info()->user_cntd0 =
current_thread_info()->user_cntd1 = NULL;
current_thread_info()->pcr_reg = 0;
write_pcr(0);
clear_thread_flag(TIF_PERFCTR);
err = 0;
}
break;
case PERFCTR_READ: {
unsigned long pic, tmp;
if (!test_thread_flag(TIF_PERFCTR)) {
err = -EINVAL;
break;
}
read_pic(pic);
tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
err |= __put_user(tmp, current_thread_info()->user_cntd0);
tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
err |= __put_user(tmp, current_thread_info()->user_cntd1);
reset_pic();
break;
}
case PERFCTR_CLRPIC:
if (!test_thread_flag(TIF_PERFCTR)) {
err = -EINVAL;
break;
}
current_thread_info()->kernel_cntd0 =
current_thread_info()->kernel_cntd1 = 0;
reset_pic();
break;
case PERFCTR_SETPCR: {
u64 __user *user_pcr = (u64 __user *)arg0;
if (!test_thread_flag(TIF_PERFCTR)) {
err = -EINVAL;
break;
}
err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
write_pcr(current_thread_info()->pcr_reg);
current_thread_info()->kernel_cntd0 =
current_thread_info()->kernel_cntd1 = 0;
reset_pic();
break;
}
case PERFCTR_GETPCR: {
u64 __user *user_pcr = (u64 __user *)arg0;
if (!test_thread_flag(TIF_PERFCTR)) {
err = -EINVAL;
break;
}
err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
break;
}
default:
err = -EINVAL;
break;
};
return err;
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.