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Commit 7d55718b authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Merge branches 'tracing/core', 'x86/urgent' and 'x86/ptrace' into tracing/hw-branch-tracing 

This pulls together all the topic branches that are needed
for the DS/BTS/PEBS tracing work.
parents 6f893fb2 de90add3 f4166c54

arch/x86/boot/tty.c

+1 −1
Original line number Diff line number Diff line
@@ -74,7 +74,7 @@ static int kbd_pending(void) 
{

	u8 pending;

	asm volatile("int $0x16; setnz %0"

		     : "=rm" (pending)

		     : "=qm" (pending)

		     : "a" (0x0100));

	return pending;

}

arch/x86/include/asm/ds.h

+4 −2
Original line number Diff line number Diff line
@@ -23,12 +23,13 @@ 
#ifndef _ASM_X86_DS_H

#define _ASM_X86_DS_H



#ifdef CONFIG_X86_DS



#include <linux/types.h>

#include <linux/init.h>





#ifdef CONFIG_X86_DS



struct task_struct;



/*
@@ -232,7 +233,8 @@ extern void ds_free(struct ds_context *context); 


#else /* CONFIG_X86_DS */



#define ds_init_intel(config) do {} while (0)

struct cpuinfo_x86;

static inline void __cpuinit ds_init_intel(struct cpuinfo_x86 *ignored) {}



#endif /* CONFIG_X86_DS */

#endif /* _ASM_X86_DS_H */

arch/x86/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -46,7 +46,7 @@ obj-$(CONFIG_X86_TRAMPOLINE) += trampoline.o 
obj-y				+= process.o

obj-y				+= i387.o xsave.o

obj-y				+= ptrace.o

obj-y				+= ds.o

obj-$(CONFIG_X86_DS)		+= ds.o

obj-$(CONFIG_X86_32)		+= tls.o

obj-$(CONFIG_IA32_EMULATION)	+= tls.o

obj-y				+= step.o

arch/x86/kernel/cpu/intel.c

+1 −2
Original line number Diff line number Diff line
@@ -307,12 +307,11 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c) 
		set_cpu_cap(c, X86_FEATURE_P4);

	if (c->x86 == 6)

		set_cpu_cap(c, X86_FEATURE_P3);

#endif



	if (cpu_has_bts)

		ptrace_bts_init_intel(c);



#endif



	detect_extended_topology(c);

	if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {

		/*

arch/x86/kernel/ds.c

+52 −45
Original line number Diff line number Diff line
@@ -21,8 +21,6 @@ 
 */





#ifdef CONFIG_X86_DS



#include <asm/ds.h>



#include <linux/errno.h>
@@ -211,14 +209,15 @@ static DEFINE_PER_CPU(struct ds_context *, system_context); 
static inline struct ds_context *ds_get_context(struct task_struct *task)

{

	struct ds_context *context;

	unsigned long irq;



	spin_lock(&ds_lock);

	spin_lock_irqsave(&ds_lock, irq);



	context = (task ? task->thread.ds_ctx : this_system_context);

	if (context)

		context->count++;



	spin_unlock(&ds_lock);

	spin_unlock_irqrestore(&ds_lock, irq);



	return context;

}
@@ -226,43 +225,33 @@ static inline struct ds_context *ds_get_context(struct task_struct *task) 
/*

 * Same as ds_get_context, but allocates the context and it's DS

 * structure, if necessary; returns NULL; if out of memory.

 *

 * pre: requires ds_lock to be held

 */

static inline struct ds_context *ds_alloc_context(struct task_struct *task)

{

	struct ds_context **p_context =

		(task ? &task->thread.ds_ctx : &this_system_context);

	struct ds_context *context = *p_context;

	unsigned long irq;



	if (!context) {

		spin_unlock(&ds_lock);



		context = kzalloc(sizeof(*context), GFP_KERNEL);



		if (!context) {

			spin_lock(&ds_lock);

		if (!context)

			return NULL;

		}



		context->ds = kzalloc(ds_cfg.sizeof_ds, GFP_KERNEL);

		if (!context->ds) {

			kfree(context);

			spin_lock(&ds_lock);

			return NULL;

		}



		spin_lock(&ds_lock);

		/*

		 * Check for race - another CPU could have allocated

		 * it meanwhile:

		 */

		spin_lock_irqsave(&ds_lock, irq);



		if (*p_context) {

			kfree(context->ds);

			kfree(context);

			return *p_context;

		}



			context = *p_context;

		} else {

			*p_context = context;



			context->this = p_context;
@@ -272,9 +261,10 @@ static inline struct ds_context *ds_alloc_context(struct task_struct *task) 
				set_tsk_thread_flag(task, TIF_DS_AREA_MSR);



			if (!task || (task == current))

			wrmsr(MSR_IA32_DS_AREA, (unsigned long)context->ds, 0);



		get_tracer(task);

				wrmsrl(MSR_IA32_DS_AREA,

				       (unsigned long)context->ds);

		}

		spin_unlock_irqrestore(&ds_lock, irq);

	}



	context->count++;
@@ -288,10 +278,12 @@ static inline struct ds_context *ds_alloc_context(struct task_struct *task) 
 */

static inline void ds_put_context(struct ds_context *context)

{

	unsigned long irq;



	if (!context)

		return;



	spin_lock(&ds_lock);

	spin_lock_irqsave(&ds_lock, irq);



	if (--context->count)

		goto out;
@@ -313,7 +305,7 @@ static inline void ds_put_context(struct ds_context *context) 
	kfree(context->ds);

	kfree(context);

 out:

	spin_unlock(&ds_lock);

	spin_unlock_irqrestore(&ds_lock, irq);

}
@@ -384,6 +376,7 @@ static int ds_request(struct task_struct *task, void *base, size_t size, 
	struct ds_context *context;

	unsigned long buffer, adj;

	const unsigned long alignment = (1 << 3);

	unsigned long irq;

	int error = 0;



	if (!ds_cfg.sizeof_ds)
@@ -398,26 +391,27 @@ static int ds_request(struct task_struct *task, void *base, size_t size, 
		return -EOPNOTSUPP;





	spin_lock(&ds_lock);



	error = -ENOMEM;

	context = ds_alloc_context(task);

	if (!context)

		goto out_unlock;

		return -ENOMEM;



	spin_lock_irqsave(&ds_lock, irq);



	error = -EPERM;

	if (!check_tracer(task))

		goto out_unlock;



	get_tracer(task);



	error = -EALREADY;

	if (context->owner[qual] == current)

		goto out_unlock;

		goto out_put_tracer;

	error = -EPERM;

	if (context->owner[qual] != NULL)

		goto out_unlock;

		goto out_put_tracer;

	context->owner[qual] = current;



	spin_unlock(&ds_lock);

	spin_unlock_irqrestore(&ds_lock, irq);





	error = -ENOMEM;
@@ -465,10 +459,17 @@ static int ds_request(struct task_struct *task, void *base, size_t size, 
 out_release:

	context->owner[qual] = NULL;

	ds_put_context(context);

	put_tracer(task);

	return error;



 out_put_tracer:

	spin_unlock_irqrestore(&ds_lock, irq);

	ds_put_context(context);

	put_tracer(task);

	return error;



 out_unlock:

	spin_unlock(&ds_lock);

	spin_unlock_irqrestore(&ds_lock, irq);

	ds_put_context(context);

	return error;

}
@@ -818,13 +819,21 @@ static const struct ds_configuration ds_cfg_var = { 
	.sizeof_ds    = sizeof(long) * 12,

	.sizeof_field = sizeof(long),

	.sizeof_rec[ds_bts]   = sizeof(long) * 3,

#ifdef __i386__

	.sizeof_rec[ds_pebs]  = sizeof(long) * 10

#else

	.sizeof_rec[ds_pebs]  = sizeof(long) * 18

#endif

};

static const struct ds_configuration ds_cfg_64 = {

	.sizeof_ds    = 8 * 12,

	.sizeof_field = 8,

	.sizeof_rec[ds_bts]   = 8 * 3,

#ifdef __i386__

	.sizeof_rec[ds_pebs]  = 8 * 10

#else

	.sizeof_rec[ds_pebs]  = 8 * 18

#endif

};



static inline void
@@ -838,17 +847,16 @@ void __cpuinit ds_init_intel(struct cpuinfo_x86 *c) 
	switch (c->x86) {

	case 0x6:

		switch (c->x86_model) {

		case 0 ... 0xC:

			/* sorry, don't know about them */

			break;

		case 0xD:

		case 0xE: /* Pentium M */

			ds_configure(&ds_cfg_var);

			break;

		case 0xF: /* Core2 */

		case 0x1C: /* Atom */

		default: /* Core2, Atom, ... */

			ds_configure(&ds_cfg_64);

			break;

		default:

			/* sorry, don't know about them */

			break;

		}

		break;

	case 0xF:
@@ -878,4 +886,3 @@ void ds_free(struct ds_context *context) 
	while (leftovers--)

		ds_put_context(context);

}
 
#endif /* CONFIG_X86_DS */