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Commit 16aab321 authored by Rashmica Gupta's avatar Rashmica Gupta Committed by Michael Ellerman
Browse files

selftests/powerpc: Add test to check if TM SPRs are corrupted 



Testing that the TM SPRs are behaving the way they should. Uses more
threads than cpus to see if the following register values persist with
context switching:
- the FS (failure summary) flag in TEXASR
- TFIAR and TFHAR

Signed-off-by: default avatarRashmica Gupta <rashmicy@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent dbccb494

tools/testing/selftests/powerpc/tm/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -5,3 +5,4 @@ tm-signal-stack 
tm-vmxcopy

tm-fork

tm-tar

tm-tmspr

tools/testing/selftests/powerpc/tm/Makefile

+2 −1
Original line number Diff line number Diff line 
TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork tm-tar

TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork tm-tar tm-tmspr



all: $(TEST_PROGS)
@@ -6,6 +6,7 @@ $(TEST_PROGS): ../harness.c ../utils.c 


tm-syscall: tm-syscall-asm.S

tm-syscall: CFLAGS += -mhtm -I../../../../../usr/include

tm-tmspr: CFLAGS += -pthread



include ../../lib.mk

tools/testing/selftests/powerpc/tm/tm-tmspr.c

0 → 100644
+143 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2015, Michael Neuling, IBM Corp.

 * Licensed under GPLv2.

 *

 * Original: Michael Neuling 3/4/2014

 * Modified: Rashmica Gupta 8/12/2015

 *

 * Check if any of the Transaction Memory SPRs get corrupted.

 * - TFIAR  - stores address of location of transaction failure

 * - TFHAR  - stores address of software failure handler (if transaction

 *   fails)

 * - TEXASR - lots of info about the transacion(s)

 *

 * (1) create more threads than cpus

 * (2) in each thread:

 * 	(a) set TFIAR and TFHAR a unique value

 * 	(b) loop for awhile, continually checking to see if

 * 	either register has been corrupted.

 *

 * (3) Loop:

 * 	(a) begin transaction

 *    	(b) abort transaction

 *	(c) check TEXASR to see if FS has been corrupted

 *

 */



#define _GNU_SOURCE

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <pthread.h>

#include <string.h>



#include "utils.h"

#include "tm.h"



int	num_loops	= 10000;

int	passed = 1;



void tfiar_tfhar(void *in)

{

	int i, cpu;

	unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd;

	cpu_set_t cpuset;



	CPU_ZERO(&cpuset);

	cpu = (unsigned long)in >> 1;

	CPU_SET(cpu, &cpuset);

	sched_setaffinity(0, sizeof(cpuset), &cpuset);



	/* TFIAR: Last bit has to be high so userspace can read register */

	tfiar = ((unsigned long)in) + 1;

	tfiar += 2;

	mtspr(SPRN_TFIAR, tfiar);



	/* TFHAR: Last two bits are reserved */

	tfhar = ((unsigned long)in);

	tfhar &= ~0x3UL;

	tfhar += 4;

	mtspr(SPRN_TFHAR, tfhar);



	for (i = 0; i < num_loops; i++)	{

		tfhar_rd = mfspr(SPRN_TFHAR);

		tfiar_rd = mfspr(SPRN_TFIAR);

		if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) {

			passed = 0;

			return;

		}

	}

	return;

}



void texasr(void *in)

{

	unsigned long i;

	uint64_t result = 0;



	for (i = 0; i < num_loops; i++) {

		asm __volatile__(

			"tbegin.;"

			"beq    3f ;"

			"tabort. 0 ;"

			"tend.;"



			/* Abort handler */

			"3: ;"

			::: "memory");



                /* Check the TEXASR */

                result = mfspr(SPRN_TEXASR);

		if ((result & TEXASR_FS) == 0) {

			passed = 0;

			return;

		}

	}

	return;

}



int test_tmspr()

{

	pthread_t 	thread;

	int	   	thread_num;

	unsigned long	i;



	SKIP_IF(!have_htm());



	/* To cause some context switching */

	thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN);



	/* Test TFIAR and TFHAR */

	for (i = 0 ; i < thread_num ; i += 2){

		if (pthread_create(&thread, NULL, (void*)tfiar_tfhar, (void *)i))

			return EXIT_FAILURE;

	}

	if (pthread_join(thread, NULL) != 0)

		return EXIT_FAILURE;



	/* Test TEXASR */

	for (i = 0 ; i < thread_num ; i++){

		if (pthread_create(&thread, NULL, (void*)texasr, (void *)i))

			return EXIT_FAILURE;

	}

	if (pthread_join(thread, NULL) != 0)

		return EXIT_FAILURE;



	if (passed)

		return 0;

	else

		return 1;

}



int main(int argc, char *argv[])

{

	if (argc > 1) {

		if (strcmp(argv[1], "-h") == 0) {

			printf("Syntax:\t [<num loops>]\n");

			return 0;

		} else {

			num_loops = atoi(argv[1]);

		}

	}

	return test_harness(test_tmspr, "tm_tmspr");

}