commit 1e3500666f7c5daaadadb8431a2927cdbbdb7dd4
author K.Prasad <prasad@linux.vnet.ibm.com> Mon Jun 01 23:44:26 2009 +0530
committer Frederic Weisbecker <fweisbec@gmail.com> Tue Jun 02 22:46:59 2009 +0200
tree b825e40b508818673ccbab079351d9140bbd48f7
parent 08d68323d1f0c34452e614263b212ca556dae47f

hw-breakpoints: use wrapper routines around debug registers in processor related functions

This patch enables the use of wrapper routines to access the debug/breakpoint
registers on cpu management.

The hardcoded debug registers save and restore operations for threads
breakpoints are replaced by wrappers.

And now that we handle the kernel breakpoints too, we also need to handle them
on cpu hotplug operations.

[ Impact: adapt new hardware breakpoint api to cpu hotplug ]

Original-patch-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

arch/x86/kernel/smpboot.c

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 58d24ef..2b2652d 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -63,6 +63,7 @@
 #include <asm/apic.h>
 #include <asm/setup.h>
 #include <asm/uv/uv.h>
+#include <asm/debugreg.h>
 #include <linux/mc146818rtc.h>
 
 #include <asm/smpboot_hooks.h>
@@ -326,6 +327,7 @@
 	setup_secondary_clock();
 
 	wmb();
+	load_debug_registers();
 	cpu_idle();
 }
 
@@ -1250,6 +1252,7 @@
 	remove_cpu_from_maps(cpu);
 	unlock_vector_lock();
 	fixup_irqs();
+	hw_breakpoint_disable();
 }
 
 int native_cpu_disable(void)

arch/x86/power/cpu_32.c

diff --git a/arch/x86/power/cpu_32.c b/arch/x86/power/cpu_32.c
index 5199139..2bc3b01 100644
--- a/arch/x86/power/cpu_32.c
+++ b/arch/x86/power/cpu_32.c
@@ -13,6 +13,7 @@
 #include <asm/mce.h>
 #include <asm/xcr.h>
 #include <asm/suspend.h>
+#include <asm/debugreg.h>
 
 static struct saved_context saved_context;
 
@@ -48,6 +49,7 @@
 	ctxt->cr2 = read_cr2();
 	ctxt->cr3 = read_cr3();
 	ctxt->cr4 = read_cr4_safe();
+	hw_breakpoint_disable();
 }
 
 /* Needed by apm.c */
@@ -83,16 +85,7 @@
 	/*
 	 * Now maybe reload the debug registers
 	 */
-	if (current->thread.debugreg7) {
-		set_debugreg(current->thread.debugreg[0], 0);
-		set_debugreg(current->thread.debugreg[1], 1);
-		set_debugreg(current->thread.debugreg[2], 2);
-		set_debugreg(current->thread.debugreg[3], 3);
-		/* no 4 and 5 */
-		set_debugreg(current->thread.debugreg6, 6);
-		set_debugreg(current->thread.debugreg7, 7);
-	}
-
+	load_debug_registers();
 }
 
 static void __restore_processor_state(struct saved_context *ctxt)

arch/x86/power/cpu_64.c

diff --git a/arch/x86/power/cpu_64.c b/arch/x86/power/cpu_64.c
index 1e3bdcc..46866a1 100644
--- a/arch/x86/power/cpu_64.c
+++ b/arch/x86/power/cpu_64.c
@@ -16,6 +16,7 @@
 #include <asm/mtrr.h>
 #include <asm/xcr.h>
 #include <asm/suspend.h>
+#include <asm/debugreg.h>
 
 static void fix_processor_context(void);
 
@@ -71,6 +72,7 @@
 	ctxt->cr3 = read_cr3();
 	ctxt->cr4 = read_cr4();
 	ctxt->cr8 = read_cr8();
+	hw_breakpoint_disable();
 }
 
 void save_processor_state(void)
@@ -162,13 +164,5 @@
 	/*
 	 * Now maybe reload the debug registers
 	 */
-	if (current->thread.debugreg7){
-		set_debugreg(current->thread.debugreg[0], 0);
-		set_debugreg(current->thread.debugreg[1], 1);
-		set_debugreg(current->thread.debugreg[2], 2);
-		set_debugreg(current->thread.debugreg[3], 3);
-                /* no 4 and 5 */
-                loaddebug(&current->thread, 6);
-                loaddebug(&current->thread, 7);
-	}
+	load_debug_registers();
 }