14 files changed, 46 insertions, 30 deletions

diff --git a/arch/powerpc/include/asm/debug.h b/arch/powerpc/include/asm/debug.h
index 716d2f089eb6..32de2577bb6d 100644
--- a/arch/powerpc/include/asm/debug.h
+++ b/arch/powerpc/include/asm/debug.h
@@ -44,7 +44,7 @@ static inline int debugger_dabr_match(struct pt_regs *regs) { return 0; }
 static inline int debugger_fault_handler(struct pt_regs *regs) { return 0; }
 #endif
 
-extern int set_dabr(unsigned long dabr);
+extern int set_dabr(unsigned long dabr, unsigned long dabrx);
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 extern void do_send_trap(struct pt_regs *regs, unsigned long address,
                          unsigned long error_code, int signal_code, int brkpt);
diff --git a/arch/powerpc/include/asm/hw_breakpoint.h b/arch/powerpc/include/asm/hw_breakpoint.h
index 39b323e80c30..c6f48eb5299c 100644
--- a/arch/powerpc/include/asm/hw_breakpoint.h
+++ b/arch/powerpc/include/asm/hw_breakpoint.h
@@ -61,7 +61,7 @@ extern void ptrace_triggered(struct perf_event *bp,
                         struct perf_sample_data *data, struct pt_regs *regs);
 static inline void hw_breakpoint_disable(void)
 {
-        set_dabr(0);
+        set_dabr(0, 0);
 }
 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
 
diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 42ce570812c1..236b4779ec4f 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -180,7 +180,8 @@ struct machdep_calls {
         void            (*enable_pmcs)(void);
 
         /* Set DABR for this platform, leave empty for default implemenation */
-        int             (*set_dabr)(unsigned long dabr);
+        int             (*set_dabr)(unsigned long dabr,
+                                    unsigned long dabrx);
 
 #ifdef CONFIG_PPC32     /* XXX for now */
         /* A general init function, called by ppc_init in init/main.c.
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 7e7fa13e4667..83efc6e81543 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -219,6 +219,7 @@ struct thread_struct {
 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 #endif
         unsigned long   dabr;           /* Data address breakpoint register */
+        unsigned long   dabrx;          /*      ... extension  */
         unsigned long   trap_nr;        /* last trap # on this thread */
 #ifdef CONFIG_ALTIVEC
         /* Complete AltiVec register set */
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index ad400a535d23..121a90bbf778 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -208,6 +208,9 @@
 #define SPRN_DABRX      0x3F7   /* Data Address Breakpoint Register Extension */
 #define   DABRX_USER    (1UL << 0)
 #define   DABRX_KERNEL  (1UL << 1)
+#define   DABRX_HYP     (1UL << 2)
+#define   DABRX_BTI     (1UL << 3)
+#define   DABRX_ALL     (DABRX_BTI | DABRX_HYP | DABRX_KERNEL | DABRX_USER)
 #define SPRN_DAR        0x013   /* Data Address Register */
 #define SPRN_DBCR       0x136   /* e300 Data Breakpoint Control Reg */
 #define SPRN_DSISR      0x012   /* Data Storage Interrupt Status Register */
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index 6767445ecb45..6891d79ecef6 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -73,7 +73,7 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
          * If so, DABR will be populated in single_step_dabr_instruction().
          */
         if (current->thread.last_hit_ubp != bp)
-                set_dabr(info->address | info->type | DABR_TRANSLATION);
+                set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL);
 
         return 0;
 }
@@ -97,7 +97,7 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
         }
 
         *slot = NULL;
-        set_dabr(0);
+        set_dabr(0, 0);
 }
 
 /*
@@ -197,7 +197,7 @@ void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs)
 
         info = counter_arch_bp(tsk->thread.last_hit_ubp);
         regs->msr &= ~MSR_SE;
-        set_dabr(info->address | info->type | DABR_TRANSLATION);
+        set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL);
         tsk->thread.last_hit_ubp = NULL;
 }
 
@@ -215,7 +215,7 @@ int __kprobes hw_breakpoint_handler(struct die_args *args)
         unsigned long dar = regs->dar;
 
         /* Disable breakpoints during exception handling */
-        set_dabr(0);
+        set_dabr(0, 0);
 
         /*
          * The counter may be concurrently released but that can only
@@ -281,7 +281,7 @@ int __kprobes hw_breakpoint_handler(struct die_args *args)
         if (!info->extraneous_interrupt)
                 perf_bp_event(bp, regs);
 
-        set_dabr(info->address | info->type | DABR_TRANSLATION);
+        set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL);
 out:
         rcu_read_unlock();
         return rc;
@@ -313,7 +313,7 @@ int __kprobes single_step_dabr_instruction(struct die_args *args)
         if (!info->extraneous_interrupt)
                 perf_bp_event(bp, regs);
 
-        set_dabr(info->address | info->type | DABR_TRANSLATION);
+        set_dabr(info->address | info->type | DABR_TRANSLATION, DABRX_ALL);
         current->thread.last_hit_ubp = NULL;
 
         /*
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 2e743de545d0..50e504c29bb9 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -285,7 +285,7 @@ void do_dabr(struct pt_regs *regs, unsigned long address,
                 return;
 
         /* Clear the DABR */
-        set_dabr(0);
+        set_dabr(0, 0);
 
         /* Deliver the signal to userspace */
         info.si_signo = SIGTRAP;
@@ -366,18 +366,19 @@ static void set_debug_reg_defaults(struct thread_struct *thread)
 {
         if (thread->dabr) {
                 thread->dabr = 0;
-                set_dabr(0);
+                thread->dabrx = 0;
+                set_dabr(0, 0);
         }
 }
 #endif /* !CONFIG_HAVE_HW_BREAKPOINT */
 #endif  /* CONFIG_PPC_ADV_DEBUG_REGS */
 
-int set_dabr(unsigned long dabr)
+int set_dabr(unsigned long dabr, unsigned long dabrx)
 {
         __get_cpu_var(current_dabr) = dabr;
 
         if (ppc_md.set_dabr)
-                return ppc_md.set_dabr(dabr);
+                return ppc_md.set_dabr(dabr, dabrx);
 
         /* XXX should we have a CPU_FTR_HAS_DABR ? */
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
@@ -387,9 +388,8 @@ int set_dabr(unsigned long dabr)
 #endif
 #elif defined(CONFIG_PPC_BOOK3S)
         mtspr(SPRN_DABR, dabr);
+        mtspr(SPRN_DABRX, dabrx);
 #endif
-
-
         return 0;
 }
 
@@ -482,7 +482,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
  */
 #ifndef CONFIG_HAVE_HW_BREAKPOINT
         if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
-                set_dabr(new->thread.dabr);
+                set_dabr(new->thread.dabr, new->thread.dabrx);
 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 #endif
 
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index c10fc28b9092..79d8e56470df 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -960,6 +960,7 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
                 thread->ptrace_bps[0] = bp;
                 ptrace_put_breakpoints(task);
                 thread->dabr = data;
+                thread->dabrx = DABRX_ALL;
                 return 0;
         }
 
@@ -983,6 +984,7 @@ int ptrace_set_debugreg(struct task_struct *task, unsigned long addr,
 
         /* Move contents to the DABR register */
         task->thread.dabr = data;
+        task->thread.dabrx = DABRX_ALL;
 #else /* CONFIG_PPC_ADV_DEBUG_REGS */
         /* As described above, it was assumed 3 bits were passed with the data
          *  address, but we will assume only the mode bits will be passed
@@ -1397,6 +1399,7 @@ static long ppc_set_hwdebug(struct task_struct *child,
                 dabr |= DABR_DATA_WRITE;
 
         child->thread.dabr = dabr;
+        child->thread.dabrx = DABRX_ALL;
 
         return 1;
 #endif /* !CONFIG_PPC_ADV_DEBUG_DVCS */
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index 29be2712e560..a2dc75793bd5 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -131,7 +131,7 @@ static int do_signal(struct pt_regs *regs)
          * triggered inside the kernel.
          */
         if (current->thread.dabr)
-                set_dabr(current->thread.dabr);
+                set_dabr(current->thread.dabr, current->thread.dabrx);
 #endif
         /* Re-enable the breakpoints for the signal stack */
         thread_change_pc(current, regs);
diff --git a/arch/powerpc/platforms/cell/beat.c b/arch/powerpc/platforms/cell/beat.c
index 852592b2b712..affcf566d460 100644
--- a/arch/powerpc/platforms/cell/beat.c
+++ b/arch/powerpc/platforms/cell/beat.c
@@ -136,9 +136,9 @@ ssize_t beat_nvram_get_size(void)
         return BEAT_NVRAM_SIZE;
 }
 
-int beat_set_xdabr(unsigned long dabr)
+int beat_set_xdabr(unsigned long dabr, unsigned long dabrx)
 {
-        if (beat_set_dabr(dabr, DABRX_KERNEL | DABRX_USER))
+        if (beat_set_dabr(dabr, dabrx))
                 return -1;
         return 0;
 }
diff --git a/arch/powerpc/platforms/cell/beat.h b/arch/powerpc/platforms/cell/beat.h
index 32c8efcedc80..bfcb8e351ae5 100644
--- a/arch/powerpc/platforms/cell/beat.h
+++ b/arch/powerpc/platforms/cell/beat.h
@@ -32,7 +32,7 @@ void beat_get_rtc_time(struct rtc_time *);
 ssize_t beat_nvram_get_size(void);
 ssize_t beat_nvram_read(char *, size_t, loff_t *);
 ssize_t beat_nvram_write(char *, size_t, loff_t *);
-int beat_set_xdabr(unsigned long);
+int beat_set_xdabr(unsigned long, unsigned long);
 void beat_power_save(void);
 void beat_kexec_cpu_down(int, int);
 
diff --git a/arch/powerpc/platforms/ps3/setup.c b/arch/powerpc/platforms/ps3/setup.c
index 2d664c5a83b0..3f509f86432c 100644
--- a/arch/powerpc/platforms/ps3/setup.c
+++ b/arch/powerpc/platforms/ps3/setup.c
@@ -184,11 +184,15 @@ early_param("ps3flash", early_parse_ps3flash);
 #define prealloc_ps3flash_bounce_buffer()       do { } while (0)
 #endif
 
-static int ps3_set_dabr(unsigned long dabr)
+static int ps3_set_dabr(unsigned long dabr, unsigned long dabrx)
 {
-        enum {DABR_USER = 1, DABR_KERNEL = 2,};
+        /* Have to set at least one bit in the DABRX */
+        if (dabrx == 0 && dabr == 0)
+                dabrx = DABRX_USER;
+        /* hypervisor only allows us to set BTI, Kernel and user */
+        dabrx &= DABRX_BTI | DABRX_KERNEL | DABRX_USER;
 
-        return lv1_set_dabr(dabr, DABR_KERNEL | DABR_USER) ? -1 : 0;
+        return lv1_set_dabr(dabr, dabrx) ? -1 : 0;
 }
 
 static void __init ps3_setup_arch(void)
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 4a2cd48b21f6..a3a69658a6ec 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -414,16 +414,20 @@ static int __init pSeries_init_panel(void)
 }
 machine_arch_initcall(pseries, pSeries_init_panel);
 
-static int pseries_set_dabr(unsigned long dabr)
+static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 {
         return plpar_hcall_norets(H_SET_DABR, dabr);
 }
 
-static int pseries_set_xdabr(unsigned long dabr)
+static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 {
-        /* We want to catch accesses from kernel and userspace */
-        return plpar_hcall_norets(H_SET_XDABR, dabr,
-                        H_DABRX_KERNEL | H_DABRX_USER);
+        /* Have to set at least one bit in the DABRX according to PAPR */
+        if (dabrx == 0 && dabr == 0)
+                dabrx = DABRX_USER;
+        /* PAPR says we can only set kernel and user bits */
+        dabrx &= H_DABRX_KERNEL | H_DABRX_USER;
+
+        return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 }
 
 #define CMO_CHARACTERISTICS_TOKEN 44
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 9b49c65ee7a4..987f441525cb 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -740,7 +740,7 @@ static void insert_bpts(void)
 static void insert_cpu_bpts(void)
 {
         if (dabr.enabled)
-                set_dabr(dabr.address | (dabr.enabled & 7));
+                set_dabr(dabr.address | (dabr.enabled & 7), DABRX_ALL);
         if (iabr && cpu_has_feature(CPU_FTR_IABR))
                 mtspr(SPRN_IABR, iabr->address
                          | (iabr->enabled & (BP_IABR|BP_IABR_TE)));
@@ -768,7 +768,7 @@ static void remove_bpts(void)
 
 static void remove_cpu_bpts(void)
 {
-        set_dabr(0);
+        set_dabr(0, 0);
         if (cpu_has_feature(CPU_FTR_IABR))
                 mtspr(SPRN_IABR, 0);
 }