1 files changed, 1 insertions, 71 deletions
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index da307dd93ee3..c8d1fa2e9d53 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -1,25 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * HW_breakpoint: a unified kernel/user-space hardware breakpoint facility,
  * using the CPU's debug registers. Derived from
  * "arch/x86/kernel/hw_breakpoint.c"
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
  * Copyright 2010 IBM Corporation
  * Author: K.Prasad <prasad@linux.vnet.ibm.com>
- *
  */
 
 #include <linux/hw_breakpoint.h>
@@ -380,59 +366,3 @@ void hw_breakpoint_pmu_read(struct perf_event *bp)
 {
 	/* TODO */
 }
-
-bool dawr_force_enable;
-EXPORT_SYMBOL_GPL(dawr_force_enable);
-
-static ssize_t dawr_write_file_bool(struct file *file,
-				    const char __user *user_buf,
-				    size_t count, loff_t *ppos)
-{
-	struct arch_hw_breakpoint null_brk = {0, 0, 0};
-	size_t rc;
-
-	/* Send error to user if they hypervisor won't allow us to write DAWR */
-	if ((!dawr_force_enable) &&
-	    (firmware_has_feature(FW_FEATURE_LPAR)) &&
-	    (set_dawr(&null_brk) != H_SUCCESS))
-		return -1;
-
-	rc = debugfs_write_file_bool(file, user_buf, count, ppos);
-	if (rc)
-		return rc;
-
-	/* If we are clearing, make sure all CPUs have the DAWR cleared */
-	if (!dawr_force_enable)
-		smp_call_function((smp_call_func_t)set_dawr, &null_brk, 0);
-
-	return rc;
-}
-
-static const struct file_operations dawr_enable_fops = {
-	.read =		debugfs_read_file_bool,
-	.write =	dawr_write_file_bool,
-	.open =		simple_open,
-	.llseek =	default_llseek,
-};
-
-static int __init dawr_force_setup(void)
-{
-	dawr_force_enable = false;
-
-	if (cpu_has_feature(CPU_FTR_DAWR)) {
-		/* Don't setup sysfs file for user control on P8 */
-		dawr_force_enable = true;
-		return 0;
-	}
-
-	if (PVR_VER(mfspr(SPRN_PVR)) == PVR_POWER9) {
-		/* Turn DAWR off by default, but allow admin to turn it on */
-		dawr_force_enable = false;
-		debugfs_create_file_unsafe("dawr_enable_dangerous", 0600,
-					   powerpc_debugfs_root,
-					   &dawr_force_enable,
-					   &dawr_enable_fops);
-	}
-	return 0;
-}
-arch_initcall(dawr_force_setup);