xnu-2782.30.5.tar.gz

[apple/xnu.git] / bsd / kern / kern_overrides.c

diff --git a/bsd/kern/kern_overrides.c b/bsd/kern/kern_overrides.c
index e2055aae6ac91aa914e7b2855d5f8014be76159d..7b2a4622c65fbb141c5155c0822767b7195eb795 100644 (file)
--- a/bsd/kern/kern_overrides.c
+++ b/bsd/kern/kern_overrides.c
@@ -44,7 +44,7 @@
 #include <mach/mach_types.h>
 #include <mach/vm_param.h>
 #include <kern/task.h>
-#include <kern/lock.h>
+#include <kern/locks.h>
 #include <kern/assert.h>
 #include <kern/sched_prim.h>
 
@@ -67,6 +67,12 @@ static int64_t               cpu_throttle_assert_cnt;
 /* Wait Channel for system override */
 static uint64_t                sys_override_wait;
 
+/* Global variable to indicate if system_override is enabled */
+int                    sys_override_enabled;
+
+/* Sysctl definition for sys_override_enabled */
+SYSCTL_INT(_debug, OID_AUTO, sys_override_enabled, CTLFLAG_RW | CTLFLAG_LOCKED, &sys_override_enabled, 0, "");
+
 /* Forward Declarations */
 static void enable_system_override(uint64_t flags);
 static void disable_system_override(uint64_t flags);
@@ -85,6 +91,7 @@ init_system_override()
        sys_override_mtx_attr = lck_attr_alloc_init();
        lck_mtx_init(&sys_override_lock, sys_override_mtx_grp, sys_override_mtx_attr);
        io_throttle_assert_cnt = cpu_throttle_assert_cnt = 0;
+       sys_override_enabled = 1;
 }
 
 /* system call implementation */
@@ -100,12 +107,30 @@ system_override(__unused struct proc *p, struct system_override_args * uap, __un
                goto out;
        }       
 
-       /* Check to see if some flags are specified. Zero flags are invalid. */
-       if ((flags == 0) || ((flags & ~SYS_OVERRIDE_FLAGS_MASK) != 0)) {
+       /* Check to see if some flags are specified. */
+       if ((flags & ~SYS_OVERRIDE_FLAGS_MASK) != 0) {
                error = EINVAL;
                goto out;
        }
 
+       if (flags == SYS_OVERRIDE_DISABLE) {
+               
+               printf("Process %s [%d] disabling system_override()\n", current_proc()->p_comm, current_proc()->p_pid);
+
+               lck_mtx_lock(&sys_override_lock);
+               
+               if (io_throttle_assert_cnt > 0)
+                       sys_override_io_throttle(THROTTLE_IO_ENABLE);
+               if (cpu_throttle_assert_cnt > 0)
+                       sys_override_cpu_throttle(CPU_THROTTLE_ENABLE);
+
+               sys_override_enabled = 0;
+                               
+               lck_mtx_unlock(&sys_override_lock);
+
+               goto out;
+       }
+
        lck_mtx_lock(&sys_override_lock);
 
        enable_system_override(flags);
@@ -129,22 +154,22 @@ enable_system_override(uint64_t flags)
 {
        
        if (flags & SYS_OVERRIDE_IO_THROTTLE) {
-               if (io_throttle_assert_cnt == 0) {
+               if ((io_throttle_assert_cnt == 0) && sys_override_enabled) {
                        /* Disable I/O Throttling */
                        printf("Process %s [%d] disabling system-wide I/O Throttling\n", current_proc()->p_comm, current_proc()->p_pid);
-                       KERNEL_DEBUG_CONSTANT(FSDBG_CODE(DBG_THROTTLE, IO_THROTTLE_DISABLE) | DBG_FUNC_START, current_proc()->p_pid, 0, 0, 0, 0);
                        sys_override_io_throttle(THROTTLE_IO_DISABLE);
                }
+               KERNEL_DEBUG_CONSTANT(FSDBG_CODE(DBG_THROTTLE, IO_THROTTLE_DISABLE) | DBG_FUNC_START, current_proc()->p_pid, 0, 0, 0, 0);
                io_throttle_assert_cnt++;
        }
        
        if (flags & SYS_OVERRIDE_CPU_THROTTLE) {
-               if (cpu_throttle_assert_cnt == 0) {
+               if ((cpu_throttle_assert_cnt == 0) && sys_override_enabled) {
                        /* Disable CPU Throttling */
                        printf("Process %s [%d] disabling system-wide CPU Throttling\n", current_proc()->p_comm, current_proc()->p_pid);
-                       KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_SCHED, MACH_CPU_THROTTLE_DISABLE) | DBG_FUNC_START, current_proc()->p_pid, 0, 0, 0, 0);
                        sys_override_cpu_throttle(CPU_THROTTLE_DISABLE);
                }
+               KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_SCHED, MACH_CPU_THROTTLE_DISABLE) | DBG_FUNC_START, current_proc()->p_pid, 0, 0, 0, 0);
                cpu_throttle_assert_cnt++;
        }
 
@@ -161,9 +186,9 @@ disable_system_override(uint64_t flags)
        if (flags & SYS_OVERRIDE_IO_THROTTLE) {
                assert(io_throttle_assert_cnt > 0);
                io_throttle_assert_cnt--;
-               if (io_throttle_assert_cnt == 0) {
+               KERNEL_DEBUG_CONSTANT(FSDBG_CODE(DBG_THROTTLE, IO_THROTTLE_DISABLE) | DBG_FUNC_END, current_proc()->p_pid, 0, 0, 0, 0);
+               if ((io_throttle_assert_cnt == 0) && sys_override_enabled) {
                        /* Enable I/O Throttling */
-                       KERNEL_DEBUG_CONSTANT(FSDBG_CODE(DBG_THROTTLE, IO_THROTTLE_DISABLE) | DBG_FUNC_END, current_proc()->p_pid, 0, 0, 0, 0);
                        sys_override_io_throttle(THROTTLE_IO_ENABLE);
                }
        }
@@ -171,9 +196,9 @@ disable_system_override(uint64_t flags)
        if (flags & SYS_OVERRIDE_CPU_THROTTLE) {
                assert(cpu_throttle_assert_cnt > 0);
                cpu_throttle_assert_cnt--;
-                       if (cpu_throttle_assert_cnt == 0) {
+               KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_SCHED, MACH_CPU_THROTTLE_DISABLE) | DBG_FUNC_END, current_proc()->p_pid, 0, 0, 0, 0);
+               if ((cpu_throttle_assert_cnt == 0) && sys_override_enabled) {
                        /* Enable CPU Throttling */
-                       KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_SCHED, MACH_CPU_THROTTLE_DISABLE) | DBG_FUNC_END, current_proc()->p_pid, 0, 0, 0, 0);
                        sys_override_cpu_throttle(CPU_THROTTLE_ENABLE);
                }
        }