Merge commit 'origin/master' into next

Conflicts:
	include/linux/kvm.h

4 files changed, 155 insertions, 73 deletions

diff --git a/arch/powerpc/platforms/powermac/low_i2c.c b/arch/powerpc/platforms/powermac/low_i2c.c
index 414ca9849f2..345e2da5676 100644
--- a/arch/powerpc/platforms/powermac/low_i2c.c
+++ b/arch/powerpc/platforms/powermac/low_i2c.c
@@ -42,6 +42,7 @@
 #include <linux/interrupt.h>
 #include <linux/timer.h>
 #include <linux/mutex.h>
+#include <linux/i2c.h>
 #include <asm/keylargo.h>
 #include <asm/uninorth.h>
 #include <asm/io.h>
@@ -80,7 +81,7 @@ struct pmac_i2c_bus
 	struct device_node	*busnode;
 	int			type;
 	int			flags;
-	struct i2c_adapter	*adapter;
+	struct i2c_adapter	adapter;
 	void			*hostdata;
 	int			channel;	/* some hosts have multiple */
 	int			mode;		/* current mode */
@@ -1014,25 +1015,9 @@ int pmac_i2c_get_channel(struct pmac_i2c_bus *bus)
 EXPORT_SYMBOL_GPL(pmac_i2c_get_channel);
 
 
-void pmac_i2c_attach_adapter(struct pmac_i2c_bus *bus,
-			     struct i2c_adapter *adapter)
-{
-	WARN_ON(bus->adapter != NULL);
-	bus->adapter = adapter;
-}
-EXPORT_SYMBOL_GPL(pmac_i2c_attach_adapter);
-
-void pmac_i2c_detach_adapter(struct pmac_i2c_bus *bus,
-			     struct i2c_adapter *adapter)
-{
-	WARN_ON(bus->adapter != adapter);
-	bus->adapter = NULL;
-}
-EXPORT_SYMBOL_GPL(pmac_i2c_detach_adapter);
-
 struct i2c_adapter *pmac_i2c_get_adapter(struct pmac_i2c_bus *bus)
 {
-	return bus->adapter;
+	return &bus->adapter;
 }
 EXPORT_SYMBOL_GPL(pmac_i2c_get_adapter);
 
@@ -1041,7 +1026,7 @@ struct pmac_i2c_bus *pmac_i2c_adapter_to_bus(struct i2c_adapter *adapter)
 	struct pmac_i2c_bus *bus;
 
 	list_for_each_entry(bus, &pmac_i2c_busses, link)
-		if (bus->adapter == adapter)
+		if (&bus->adapter == adapter)
 			return bus;
 	return NULL;
 }
@@ -1053,7 +1038,7 @@ int pmac_i2c_match_adapter(struct device_node *dev, struct i2c_adapter *adapter)
 
 	if (bus == NULL)
 		return 0;
-	return (bus->adapter == adapter);
+	return (&bus->adapter == adapter);
 }
 EXPORT_SYMBOL_GPL(pmac_i2c_match_adapter);
 
diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S
index c1427b3634e..383a5d0e981 100644
--- a/arch/powerpc/platforms/pseries/hvCall.S
+++ b/arch/powerpc/platforms/pseries/hvCall.S
@@ -14,68 +14,94 @@
 	
 #define STK_PARM(i)     (48 + ((i)-3)*8)
 
-#ifdef CONFIG_HCALL_STATS
+#ifdef CONFIG_TRACEPOINTS
+
+	.section	".toc","aw"
+
+	.globl hcall_tracepoint_refcount
+hcall_tracepoint_refcount:
+	.llong	0
+
+	.section	".text"
+
 /*
  * precall must preserve all registers.  use unused STK_PARM()
- * areas to save snapshots and opcode.
+ * areas to save snapshots and opcode. We branch around this
+ * in early init (eg when populating the MMU hashtable) by using an
+ * unconditional cpu feature.
  */
-#define HCALL_INST_PRECALL					\
-	std	r3,STK_PARM(r3)(r1);	/* save opcode */	\
-	mftb	r0;			/* get timebase and */	\
-	std     r0,STK_PARM(r5)(r1);	/* save for later */	\
+#define HCALL_INST_PRECALL(FIRST_REG)				\
 BEGIN_FTR_SECTION;						\
-	mfspr	r0,SPRN_PURR;		/* get PURR and */	\
-	std	r0,STK_PARM(r6)(r1);	/* save for later */	\
-END_FTR_SECTION_IFSET(CPU_FTR_PURR);
-	
+	b	1f;						\
+END_FTR_SECTION(0, 1);						\
+	ld      r12,hcall_tracepoint_refcount@toc(r2);		\
+	cmpdi	r12,0;						\
+	beq+	1f;						\
+	mflr	r0;						\
+	std	r3,STK_PARM(r3)(r1);				\
+	std	r4,STK_PARM(r4)(r1);				\
+	std	r5,STK_PARM(r5)(r1);				\
+	std	r6,STK_PARM(r6)(r1);				\
+	std	r7,STK_PARM(r7)(r1);				\
+	std	r8,STK_PARM(r8)(r1);				\
+	std	r9,STK_PARM(r9)(r1);				\
+	std	r10,STK_PARM(r10)(r1);				\
+	std	r0,16(r1);					\
+	addi	r4,r1,STK_PARM(FIRST_REG);			\
+	stdu	r1,-STACK_FRAME_OVERHEAD(r1);			\
+	bl	.__trace_hcall_entry;				\
+	addi	r1,r1,STACK_FRAME_OVERHEAD;			\
+	ld	r0,16(r1);					\
+	ld	r3,STK_PARM(r3)(r1);				\
+	ld	r4,STK_PARM(r4)(r1);				\
+	ld	r5,STK_PARM(r5)(r1);				\
+	ld	r6,STK_PARM(r6)(r1);				\
+	ld	r7,STK_PARM(r7)(r1);				\
+	ld	r8,STK_PARM(r8)(r1);				\
+	ld	r9,STK_PARM(r9)(r1);				\
+	ld	r10,STK_PARM(r10)(r1);				\
+	mtlr	r0;						\
+1:
+
 /*
  * postcall is performed immediately before function return which
  * allows liberal use of volatile registers.  We branch around this
  * in early init (eg when populating the MMU hashtable) by using an
  * unconditional cpu feature.
  */
-#define HCALL_INST_POSTCALL					\
+#define __HCALL_INST_POSTCALL					\
 BEGIN_FTR_SECTION;						\
 	b	1f;						\
 END_FTR_SECTION(0, 1);						\
-	ld	r4,STK_PARM(r3)(r1);	/* validate opcode */	\
-	cmpldi	cr7,r4,MAX_HCALL_OPCODE;			\
-	bgt-	cr7,1f;						\
-								\
-	/* get time and PURR snapshots after hcall */		\
-	mftb	r7;			/* timebase after */	\
-BEGIN_FTR_SECTION;						\
-	mfspr	r8,SPRN_PURR;		/* PURR after */	\
-	ld	r6,STK_PARM(r6)(r1);	/* PURR before */	\
-	subf	r6,r6,r8;		/* delta */		\
-END_FTR_SECTION_IFSET(CPU_FTR_PURR);				\
-	ld	r5,STK_PARM(r5)(r1);	/* timebase before */	\
-	subf	r5,r5,r7;		/* time delta */	\
-								\
-	/* calculate address of stat structure r4 = opcode */	\
-	srdi	r4,r4,2;		/* index into array */	\
-	mulli	r4,r4,HCALL_STAT_SIZE;				\
-	LOAD_REG_ADDR(r7, per_cpu__hcall_stats);		\
-	add	r4,r4,r7;					\
-	ld	r7,PACA_DATA_OFFSET(r13); /* per cpu offset */	\
-	add	r4,r4,r7;					\
-								\
-	/* update stats	*/					\
-	ld	r7,HCALL_STAT_CALLS(r4); /* count */		\
-	addi	r7,r7,1;					\
-	std	r7,HCALL_STAT_CALLS(r4);			\
-	ld      r7,HCALL_STAT_TB(r4);	/* timebase */		\
-	add	r7,r7,r5;					\
-	std	r7,HCALL_STAT_TB(r4);				\
-BEGIN_FTR_SECTION;						\
-	ld	r7,HCALL_STAT_PURR(r4);	/* PURR */		\
-	add	r7,r7,r6;					\
-	std	r7,HCALL_STAT_PURR(r4);				\
-END_FTR_SECTION_IFSET(CPU_FTR_PURR);				\
+	ld      r12,hcall_tracepoint_refcount@toc(r2);		\
+	cmpdi	r12,0;						\
+	beq+	1f;						\
+	mflr	r0;						\
+	ld	r6,STK_PARM(r3)(r1);				\
+	std	r3,STK_PARM(r3)(r1);				\
+	mr	r4,r3;						\
+	mr	r3,r6;						\
+	std	r0,16(r1);					\
+	stdu	r1,-STACK_FRAME_OVERHEAD(r1);			\
+	bl	.__trace_hcall_exit;				\
+	addi	r1,r1,STACK_FRAME_OVERHEAD;			\
+	ld	r0,16(r1);					\
+	ld	r3,STK_PARM(r3)(r1);				\
+	mtlr	r0;						\
 1:
+
+#define HCALL_INST_POSTCALL_NORETS				\
+	li	r5,0;						\
+	__HCALL_INST_POSTCALL
+
+#define HCALL_INST_POSTCALL(BUFREG)				\
+	mr	r5,BUFREG;					\
+	__HCALL_INST_POSTCALL
+
 #else
-#define HCALL_INST_PRECALL
-#define HCALL_INST_POSTCALL
+#define HCALL_INST_PRECALL(FIRST_ARG)
+#define HCALL_INST_POSTCALL_NORETS
+#define HCALL_INST_POSTCALL(BUFREG)
 #endif
 
 	.text
@@ -86,11 +112,11 @@ _GLOBAL(plpar_hcall_norets)
 	mfcr	r0
 	stw	r0,8(r1)
 
-	HCALL_INST_PRECALL
+	HCALL_INST_PRECALL(r4)
 
 	HVSC				/* invoke the hypervisor */
 
-	HCALL_INST_POSTCALL
+	HCALL_INST_POSTCALL_NORETS
 
 	lwz	r0,8(r1)
 	mtcrf	0xff,r0
@@ -102,7 +128,7 @@ _GLOBAL(plpar_hcall)
 	mfcr	r0
 	stw	r0,8(r1)
 
-	HCALL_INST_PRECALL
+	HCALL_INST_PRECALL(r5)
 
 	std     r4,STK_PARM(r4)(r1)     /* Save ret buffer */
 
@@ -121,7 +147,7 @@ _GLOBAL(plpar_hcall)
 	std	r6, 16(r12)
 	std	r7, 24(r12)
 
-	HCALL_INST_POSTCALL
+	HCALL_INST_POSTCALL(r12)
 
 	lwz	r0,8(r1)
 	mtcrf	0xff,r0
@@ -168,7 +194,7 @@ _GLOBAL(plpar_hcall9)
 	mfcr	r0
 	stw	r0,8(r1)
 
-	HCALL_INST_PRECALL
+	HCALL_INST_PRECALL(r5)
 
 	std     r4,STK_PARM(r4)(r1)     /* Save ret buffer */
 
@@ -196,7 +222,7 @@ _GLOBAL(plpar_hcall9)
 	std	r11,56(r12)
 	std	r0, 64(r12)
 
-	HCALL_INST_POSTCALL
+	HCALL_INST_POSTCALL(r12)
 
 	lwz	r0,8(r1)
 	mtcrf	0xff,r0
diff --git a/arch/powerpc/platforms/pseries/hvCall_inst.c b/arch/powerpc/platforms/pseries/hvCall_inst.c
index 3631a4f277e..2f58c71b725 100644
--- a/arch/powerpc/platforms/pseries/hvCall_inst.c
+++ b/arch/powerpc/platforms/pseries/hvCall_inst.c
@@ -26,6 +26,7 @@
 #include <asm/hvcall.h>
 #include <asm/firmware.h>
 #include <asm/cputable.h>
+#include <asm/trace.h>
 
 DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
 
@@ -100,6 +101,35 @@ static const struct file_operations hcall_inst_seq_fops = {
 #define	HCALL_ROOT_DIR		"hcall_inst"
 #define CPU_NAME_BUF_SIZE	32
 
+
+static void probe_hcall_entry(unsigned long opcode, unsigned long *args)
+{
+	struct hcall_stats *h;
+
+	if (opcode > MAX_HCALL_OPCODE)
+		return;
+
+	h = &get_cpu_var(hcall_stats)[opcode / 4];
+	h->tb_start = mftb();
+	h->purr_start = mfspr(SPRN_PURR);
+}
+
+static void probe_hcall_exit(unsigned long opcode, unsigned long retval,
+			     unsigned long *retbuf)
+{
+	struct hcall_stats *h;
+
+	if (opcode > MAX_HCALL_OPCODE)
+		return;
+
+	h = &__get_cpu_var(hcall_stats)[opcode / 4];
+	h->num_calls++;
+	h->tb_total = mftb() - h->tb_start;
+	h->purr_total = mfspr(SPRN_PURR) - h->purr_start;
+
+	put_cpu_var(hcall_stats);
+}
+
 static int __init hcall_inst_init(void)
 {
 	struct dentry *hcall_root;
@@ -110,6 +140,14 @@ static int __init hcall_inst_init(void)
 	if (!firmware_has_feature(FW_FEATURE_LPAR))
 		return 0;
 
+	if (register_trace_hcall_entry(probe_hcall_entry))
+		return -EINVAL;
+
+	if (register_trace_hcall_exit(probe_hcall_exit)) {
+		unregister_trace_hcall_entry(probe_hcall_entry);
+		return -EINVAL;
+	}
+
 	hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
 	if (!hcall_root)
 		return -ENOMEM;
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 903eb9eec68..0707653612b 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -39,6 +39,7 @@
 #include <asm/cputable.h>
 #include <asm/udbg.h>
 #include <asm/smp.h>
+#include <asm/trace.h>
 
 #include "plpar_wrappers.h"
 #include "pseries.h"
@@ -661,3 +662,35 @@ void arch_free_page(struct page *page, int order)
 EXPORT_SYMBOL(arch_free_page);
 
 #endif
+
+#ifdef CONFIG_TRACEPOINTS
+/*
+ * We optimise our hcall path by placing hcall_tracepoint_refcount
+ * directly in the TOC so we can check if the hcall tracepoints are
+ * enabled via a single load.
+ */
+
+/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
+extern long hcall_tracepoint_refcount;
+
+void hcall_tracepoint_regfunc(void)
+{
+	hcall_tracepoint_refcount++;
+}
+
+void hcall_tracepoint_unregfunc(void)
+{
+	hcall_tracepoint_refcount--;
+}
+
+void __trace_hcall_entry(unsigned long opcode, unsigned long *args)
+{
+	trace_hcall_entry(opcode, args);
+}
+
+void __trace_hcall_exit(long opcode, unsigned long retval,
+			unsigned long *retbuf)
+{
+	trace_hcall_exit(opcode, retval, retbuf);
+}
+#endif