Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 8e3441eb authored by Zhigang Lu's avatar Zhigang Lu Committed by Chris Metcalf
Browse files

tile: Add support for handling PMC hardware 



The PMC module is used by perf_events, oprofile and watchdogs.

Signed-off-by: default avatarZhigang Lu <zlu@tilera.com>
Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent 2e285458

arch/tile/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -66,6 +66,10 @@ config HUGETLB_SUPER_PAGES 
config GENERIC_TIME_VSYSCALL

	def_bool y



# Enable PMC if PERF_EVENTS, OPROFILE, or WATCHPOINTS are enabled.

config USE_PMC

	bool



# FIXME: tilegx can implement a more efficient rwsem.

config RWSEM_GENERIC_SPINLOCK

	def_bool y

arch/tile/include/asm/pmc.h

0 → 100644
+64 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2014 Tilera Corporation. All Rights Reserved.

 *

 *   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, version 2.

 *

 *   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, GOOD TITLE or

 *   NON INFRINGEMENT.  See the GNU General Public License for

 *   more details.

 */



#ifndef _ASM_TILE_PMC_H

#define _ASM_TILE_PMC_H



#include <linux/ptrace.h>



#define TILE_BASE_COUNTERS	2



/* Bitfields below are derived from SPR PERF_COUNT_CTL*/

#ifndef __tilegx__

/* PERF_COUNT_CTL on TILEPro */

#define TILE_CTL_EXCL_USER	(1 << 7) /* exclude user level */

#define TILE_CTL_EXCL_KERNEL	(1 << 8) /* exclude kernel level */

#define TILE_CTL_EXCL_HV	(1 << 9) /* exclude hypervisor level */



#define TILE_SEL_MASK		0x7f	/* 7 bits for event SEL,

					COUNT_0_SEL */

#define TILE_PLM_MASK		0x780	/* 4 bits priv level msks,

					COUNT_0_MASK*/

#define TILE_EVENT_MASK	(TILE_SEL_MASK | TILE_PLM_MASK)



#else /* __tilegx__*/

/* PERF_COUNT_CTL on TILEGx*/

#define TILE_CTL_EXCL_USER	(1 << 10) /* exclude user level */

#define TILE_CTL_EXCL_KERNEL	(1 << 11) /* exclude kernel level */

#define TILE_CTL_EXCL_HV	(1 << 12) /* exclude hypervisor level */



#define TILE_SEL_MASK		0x3f	/* 6 bits for event SEL,

					COUNT_0_SEL*/

#define TILE_BOX_MASK		0x1c0	/* 3 bits box msks,

					COUNT_0_BOX */

#define TILE_PLM_MASK		0x3c00	/* 4 bits priv level msks,

					COUNT_0_MASK */

#define TILE_EVENT_MASK	(TILE_SEL_MASK | TILE_BOX_MASK | TILE_PLM_MASK)

#endif /* __tilegx__*/



/* Takes register and fault number.  Returns error to disable the interrupt. */

typedef int (*perf_irq_t)(struct pt_regs *, int);



int userspace_perf_handler(struct pt_regs *regs, int fault);



perf_irq_t reserve_pmc_hardware(perf_irq_t new_perf_irq);

void release_pmc_hardware(void);



unsigned long pmc_get_overflow(void);

void pmc_ack_overflow(unsigned long status);



void unmask_pmc_interrupts(void);

void mask_pmc_interrupts(void);



#endif /* _ASM_TILE_PMC_H */

arch/tile/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ obj-$(CONFIG_PCI) += pci_gx.o 
else

obj-$(CONFIG_PCI)		+= pci.o

endif

obj-$(CONFIG_USE_PMC)		+= pmc.o

obj-$(CONFIG_TILE_USB)		+= usb.o

obj-$(CONFIG_TILE_HVGLUE_TRACE)	+= hvglue_trace.o

obj-$(CONFIG_FUNCTION_TRACER)	+= ftrace.o mcount_64.o

arch/tile/kernel/intvec_32.S

+7 −6
Original line number Diff line number Diff line
@@ -313,13 +313,13 @@ intvec_\vecname: 
	 movei  r3, 0

	}

	.else

	.ifc \c_routine, op_handle_perf_interrupt

	.ifc \c_routine, handle_perf_interrupt

	{

	 mfspr  r2, PERF_COUNT_STS

	 movei  r3, -1   /* not used, but set for consistency */

	}

	.else

	.ifc \c_routine, op_handle_aux_perf_interrupt

	.ifc \c_routine, handle_perf_interrupt

	{

	 mfspr  r2, AUX_PERF_COUNT_STS

	 movei  r3, -1   /* not used, but set for consistency */
@@ -1835,8 +1835,9 @@ int_unalign: 
/* Include .intrpt array of interrupt vectors */

	.section ".intrpt", "ax"



#define op_handle_perf_interrupt bad_intr

#define op_handle_aux_perf_interrupt bad_intr

#ifndef CONFIG_USE_PMC

#define handle_perf_interrupt bad_intr

#endif



#ifndef CONFIG_HARDWALL

#define do_hardwall_trap bad_intr
@@ -1877,7 +1878,7 @@ int_unalign: 
	int_hand     INT_IDN_AVAIL, IDN_AVAIL, bad_intr

	int_hand     INT_UDN_AVAIL, UDN_AVAIL, bad_intr

	int_hand     INT_PERF_COUNT, PERF_COUNT, \

		     op_handle_perf_interrupt, handle_nmi

		     handle_perf_interrupt, handle_nmi

	int_hand     INT_INTCTRL_3, INTCTRL_3, bad_intr

#if CONFIG_KERNEL_PL == 2

	dc_dispatch  INT_INTCTRL_2, INTCTRL_2
@@ -1902,7 +1903,7 @@ int_unalign: 
	int_hand     INT_SN_CPL, SN_CPL, bad_intr

	int_hand     INT_DOUBLE_FAULT, DOUBLE_FAULT, do_trap

	int_hand     INT_AUX_PERF_COUNT, AUX_PERF_COUNT, \

		     op_handle_aux_perf_interrupt, handle_nmi

		     handle_perf_interrupt, handle_nmi



	/* Synthetic interrupt delivered only by the simulator */

	int_hand     INT_BREAKPOINT, BREAKPOINT, do_breakpoint

arch/tile/kernel/intvec_64.S

+7 −6
Original line number Diff line number Diff line
@@ -509,10 +509,10 @@ intvec_\vecname: 
	.ifc \c_routine, do_trap

	mfspr   r2, GPV_REASON

	.else

	.ifc \c_routine, op_handle_perf_interrupt

	.ifc \c_routine, handle_perf_interrupt

	mfspr   r2, PERF_COUNT_STS

	.else

	.ifc \c_routine, op_handle_aux_perf_interrupt

	.ifc \c_routine, handle_perf_interrupt

	mfspr   r2, AUX_PERF_COUNT_STS

	.endif

	.endif
@@ -1491,8 +1491,9 @@ STD_ENTRY(fill_ra_stack) 
	.global intrpt_start

intrpt_start:



#define op_handle_perf_interrupt bad_intr

#define op_handle_aux_perf_interrupt bad_intr

#ifndef CONFIG_USE_PMC

#define handle_perf_interrupt bad_intr

#endif



#ifndef CONFIG_HARDWALL

#define do_hardwall_trap bad_intr
@@ -1540,9 +1541,9 @@ intrpt_start: 
#endif

	int_hand     INT_IPI_0, IPI_0, bad_intr

	int_hand     INT_PERF_COUNT, PERF_COUNT, \

		     op_handle_perf_interrupt, handle_nmi

		     handle_perf_interrupt, handle_nmi

	int_hand     INT_AUX_PERF_COUNT, AUX_PERF_COUNT, \

		     op_handle_perf_interrupt, handle_nmi

		     handle_perf_interrupt, handle_nmi

	int_hand     INT_INTCTRL_3, INTCTRL_3, bad_intr

#if CONFIG_KERNEL_PL == 2

	dc_dispatch  INT_INTCTRL_2, INTCTRL_2