[POWERPC] powerpc: Instrument Hypervisor Calls (57852a85) · Commits · e / devices / android_kernel_xiaomi_nabu

arch/powerpc/Kconfig.debug

+14 −0

Original line number	Original line	Diff line number	Diff line
	@@ -18,6 +18,20 @@ config DEBUG_STACK_USAGE

	This option will slow down process creation somewhat.		This option will slow down process creation somewhat.

			config HCALL_STATS
			bool "Hypervisor call instrumentation"
			depends on PPC_PSERIES && DEBUG_FS
			help
			Adds code to keep track of the number of hypervisor calls made and
			the amount of time spent in hypervisor callsr. Wall time spent in
			each call is always calculated, and if available CPU cycles spent
			are also calculated. A directory named hcall_inst is added at the
			root of the debugfs filesystem. Within the hcall_inst directory
			are files that contain CPU specific call statistics.

			This option will add a small amount of overhead to all hypervisor
			calls.

	config DEBUGGER		config DEBUGGER
	bool "Enable debugger hooks"		bool "Enable debugger hooks"
	depends on DEBUG_KERNEL		depends on DEBUG_KERNEL

arch/powerpc/kernel/asm-offsets.c

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -137,6 +137,7 @@ int main(void)
	DEFINE(PACA_USER_TIME, offsetof(struct paca_struct, user_time));		DEFINE(PACA_USER_TIME, offsetof(struct paca_struct, user_time));
	DEFINE(PACA_SYSTEM_TIME, offsetof(struct paca_struct, system_time));		DEFINE(PACA_SYSTEM_TIME, offsetof(struct paca_struct, system_time));
	DEFINE(PACA_SLBSHADOWPTR, offsetof(struct paca_struct, slb_shadow_ptr));		DEFINE(PACA_SLBSHADOWPTR, offsetof(struct paca_struct, slb_shadow_ptr));
			DEFINE(PACA_DATA_OFFSET, offsetof(struct paca_struct, data_offset));

	DEFINE(SLBSHADOW_STACKVSID,		DEFINE(SLBSHADOW_STACKVSID,
	offsetof(struct slb_shadow, save_area[SLB_NUM_BOLTED - 1].vsid));		offsetof(struct slb_shadow, save_area[SLB_NUM_BOLTED - 1].vsid));
	@@ -165,6 +166,12 @@ int main(void)
	/* Create extra stack space for SRR0 and SRR1 when calling prom/rtas. */		/* Create extra stack space for SRR0 and SRR1 when calling prom/rtas. */
	DEFINE(PROM_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs) + 16);		DEFINE(PROM_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs) + 16);
	DEFINE(RTAS_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs) + 16);		DEFINE(RTAS_FRAME_SIZE, STACK_FRAME_OVERHEAD + sizeof(struct pt_regs) + 16);

			/* hcall statistics */
			DEFINE(HCALL_STAT_SIZE, sizeof(struct hcall_stats));
			DEFINE(HCALL_STAT_CALLS, offsetof(struct hcall_stats, num_calls));
			DEFINE(HCALL_STAT_TB, offsetof(struct hcall_stats, tb_total));
			DEFINE(HCALL_STAT_PURR, offsetof(struct hcall_stats, purr_total));
	#endif /* CONFIG_PPC64 */		#endif /* CONFIG_PPC64 */
	DEFINE(GPR0, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[0]));		DEFINE(GPR0, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[0]));
	DEFINE(GPR1, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[1]));		DEFINE(GPR1, STACK_FRAME_OVERHEAD+offsetof(struct pt_regs, gpr[1]));

arch/powerpc/platforms/pseries/Makefile

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -12,3 +12,4 @@ obj-$(CONFIG_EEH) += eeh.o eeh_cache.o eeh_driver.o eeh_event.o

	obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o		obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o
	obj-$(CONFIG_HVCS) += hvcserver.o		obj-$(CONFIG_HVCS) += hvcserver.o
			obj-$(CONFIG_HCALL_STATS) += hvCall_inst.o

arch/powerpc/platforms/pseries/hvCall.S

+72 −0

Original line number	Original line	Diff line number	Diff line
	@@ -10,9 +10,69 @@
	#include <asm/hvcall.h>		#include <asm/hvcall.h>
	#include <asm/processor.h>		#include <asm/processor.h>
	#include <asm/ppc_asm.h>		#include <asm/ppc_asm.h>
			#include <asm/asm-offsets.h>

	#define STK_PARM(i) (48 + ((i)-3)*8)		#define STK_PARM(i) (48 + ((i)-3)*8)

			#ifdef CONFIG_HCALL_STATS
			/*
			* precall must preserve all registers. use unused STK_PARM()
			* areas to save snapshots and opcode.
			*/
			#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 */ \
			BEGIN_FTR_SECTION; \
			mfspr r0,SPRN_PURR; /* get PURR and */ \
			std r0,STK_PARM(r6)(r1); /* save for later */ \
			END_FTR_SECTION_IFCLR(CPU_FTR_PURR);

			/*
			* postcall is performed immediately before function return which
			* allows liberal use of volatile registers.
			*/
			#define HCALL_INST_POSTCALL \
			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_IFCLR(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_IFCLR(CPU_FTR_PURR); \
			1:
			#else
			#define HCALL_INST_PRECALL
			#define HCALL_INST_POSTCALL
			#endif

	.text		.text

	_GLOBAL(plpar_hcall_norets)		_GLOBAL(plpar_hcall_norets)
	@@ -21,8 +81,12 @@ _GLOBAL(plpar_hcall_norets)
	mfcr r0		mfcr r0
	stw r0,8(r1)		stw r0,8(r1)

			HCALL_INST_PRECALL

	HVSC /* invoke the hypervisor */		HVSC /* invoke the hypervisor */

			HCALL_INST_POSTCALL

	lwz r0,8(r1)		lwz r0,8(r1)
	mtcrf 0xff,r0		mtcrf 0xff,r0
	blr /* return r3 = status */		blr /* return r3 = status */
	@@ -33,6 +97,8 @@ _GLOBAL(plpar_hcall)
	mfcr r0		mfcr r0
	stw r0,8(r1)		stw r0,8(r1)

			HCALL_INST_PRECALL

	std r4,STK_PARM(r4)(r1) /* Save ret buffer */		std r4,STK_PARM(r4)(r1) /* Save ret buffer */

	mr r4,r5		mr r4,r5
	@@ -50,6 +116,8 @@ _GLOBAL(plpar_hcall)
	std r6, 16(r12)		std r6, 16(r12)
	std r7, 24(r12)		std r7, 24(r12)

			HCALL_INST_POSTCALL

	lwz r0,8(r1)		lwz r0,8(r1)
	mtcrf 0xff,r0		mtcrf 0xff,r0

	@@ -61,6 +129,8 @@ _GLOBAL(plpar_hcall9)
	mfcr r0		mfcr r0
	stw r0,8(r1)		stw r0,8(r1)

			HCALL_INST_PRECALL

	std r4,STK_PARM(r4)(r1) /* Save ret buffer */		std r4,STK_PARM(r4)(r1) /* Save ret buffer */

	mr r4,r5		mr r4,r5
	@@ -86,6 +156,8 @@ _GLOBAL(plpar_hcall9)
	std r11,56(r12)		std r11,56(r12)
	std r12,64(r12)		std r12,64(r12)

			HCALL_INST_POSTCALL

	lwz r0,8(r1)		lwz r0,8(r1)
	mtcrf 0xff,r0		mtcrf 0xff,r0

arch/powerpc/platforms/pseries/hvCall_inst.c

0 → 100644

+129 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* Copyright (C) 2006 Mike Kravetz IBM Corporation
			*
			* Hypervisor Call Instrumentation
			*
			* 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; either version 2 of the License, or
			* (at your option) any later version.
			*
			* 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. See the
			* GNU General Public License for more details.
			*
			* You should have received a copy of the GNU General Public License
			* along with this program; if not, write to the Free Software
			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
			*/

			#include <linux/kernel.h>
			#include <linux/percpu.h>
			#include <linux/debugfs.h>
			#include <linux/seq_file.h>
			#include <linux/cpumask.h>
			#include <asm/hvcall.h>
			#include <asm/firmware.h>
			#include <asm/cputable.h>

			DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);

			/*
			* Routines for displaying the statistics in debugfs
			*/
			static void hc_start(struct seq_file m, loff_t *pos)
			{
			if ((int)*pos < HCALL_STAT_ARRAY_SIZE)
			return (void )(unsigned long)(pos + 1);

			return NULL;
			}

			static void hc_next(struct seq_file m, void p, loff_t pos)
			{
			++*pos;

			return hc_start(m, pos);
			}

			static void hc_stop(struct seq_file m, void p)
			{
			}

			static int hc_show(struct seq_file m, void p)
			{
			unsigned long h_num = (unsigned long)p;
			struct hcall_stats hs = (struct hcall_stats )m->private;

			if (hs[h_num].num_calls) {
			if (!cpu_has_feature(CPU_FTR_PURR))
			seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
			hs[h_num].num_calls,
			hs[h_num].tb_total,
			hs[h_num].purr_total);
			else
			seq_printf(m, "%lu %lu %lu\n", h_num<<2,
			hs[h_num].num_calls,
			hs[h_num].tb_total);
			}

			return 0;
			}

			static struct seq_operations hcall_inst_seq_ops = {
			.start = hc_start,
			.next = hc_next,
			.stop = hc_stop,
			.show = hc_show
			};

			static int hcall_inst_seq_open(struct inode inode, struct file file)
			{
			int rc;
			struct seq_file *seq;

			rc = seq_open(file, &hcall_inst_seq_ops);
			seq = file->private_data;
			seq->private = file->f_dentry->d_inode->u.generic_ip;

			return rc;
			}

			static struct file_operations hcall_inst_seq_fops = {
			.open = hcall_inst_seq_open,
			.read = seq_read,
			.llseek = seq_lseek,
			.release = seq_release,
			};

			#define HCALL_ROOT_DIR "hcall_inst"
			#define CPU_NAME_BUF_SIZE 32

			static int __init hcall_inst_init(void)
			{
			struct dentry *hcall_root;
			struct dentry *hcall_file;
			char cpu_name_buf[CPU_NAME_BUF_SIZE];
			int cpu;

			if (!firmware_has_feature(FW_FEATURE_LPAR))
			return 0;

			hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
			if (!hcall_root)
			return -ENOMEM;

			for_each_possible_cpu(cpu) {
			snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
			hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
			hcall_root,
			per_cpu(hcall_stats, cpu),
			&hcall_inst_seq_fops);
			if (!hcall_file)
			return -ENOMEM;
			}

			return 0;
			}
			__initcall(hcall_inst_init);