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Commit cde97f84 authored by Michael Neuling's avatar Michael Neuling Committed by Michael Ellerman
Browse files

selftests/powerpc: Test TM and VMX register state 



Test that the VMX checkpointed register state is maintained when a VMX
unavailable exception is taken during a transaction.

Thanks to Breno Leitao <brenohl@br.ibm.com> and
Gustavo Bueno Romero <gromero@br.ibm.com> for the original test this
is based heavily on.

Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
Reviewed-by: default avatarCyril Bur <cyrilbur@gmail.com>
[mpe: Add to .gitignore, always build it 64-bit to fix build errors]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent f48e91e8

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

+1 −0
Original line number Diff line number Diff line
@@ -11,3 +11,4 @@ tm-signal-context-chk-fpu 
tm-signal-context-chk-gpr

tm-signal-context-chk-vmx

tm-signal-context-chk-vsx

tm-vmx-unavail

tools/testing/selftests/powerpc/tm/Makefile

+3 −1
Original line number Diff line number Diff line
@@ -2,7 +2,8 @@ SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr tm-signal-context-chk-fpu 
	tm-signal-context-chk-vmx tm-signal-context-chk-vsx



TEST_GEN_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \

	tm-vmxcopy tm-fork tm-tar tm-tmspr $(SIGNAL_CONTEXT_CHK_TESTS)

	tm-vmxcopy tm-fork tm-tar tm-tmspr tm-vmx-unavail \

	$(SIGNAL_CONTEXT_CHK_TESTS)



include ../../lib.mk
@@ -13,6 +14,7 @@ CFLAGS += -mhtm 
$(OUTPUT)/tm-syscall: tm-syscall-asm.S

$(OUTPUT)/tm-syscall: CFLAGS += -I../../../../../usr/include

$(OUTPUT)/tm-tmspr: CFLAGS += -pthread

$(OUTPUT)/tm-vmx-unavail: CFLAGS += -pthread -m64



SIGNAL_CONTEXT_CHK_TESTS := $(patsubst %,$(OUTPUT)/%,$(SIGNAL_CONTEXT_CHK_TESTS))

$(SIGNAL_CONTEXT_CHK_TESTS): tm-signal.S

tools/testing/selftests/powerpc/tm/tm-vmx-unavail.c

0 → 100644
+118 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2017, Michael Neuling, IBM Corp.

 * Licensed under GPLv2.

 * Original: Breno Leitao <brenohl@br.ibm.com> &

 *           Gustavo Bueno Romero <gromero@br.ibm.com>

 * Edited: Michael Neuling

 *

 * Force VMX unavailable during a transaction and see if it corrupts

 * the checkpointed VMX register state after the abort.

 */



#include <inttypes.h>

#include <htmintrin.h>

#include <string.h>

#include <stdlib.h>

#include <stdio.h>

#include <pthread.h>

#include <sys/mman.h>

#include <unistd.h>

#include <pthread.h>



#include "tm.h"

#include "utils.h"



int passed;



void *worker(void *unused)

{

	__int128 vmx0;

	uint64_t texasr;



	asm goto (

		"li       3, 1;"  /* Stick non-zero value in VMX0 */

		"std      3, 0(%[vmx0_ptr]);"

		"lvx      0, 0, %[vmx0_ptr];"



		/* Wait here a bit so we get scheduled out 255 times */

		"lis      3, 0x3fff;"

		"1: ;"

		"addi     3, 3, -1;"

		"cmpdi    3, 0;"

		"bne      1b;"



		/* Kernel will hopefully turn VMX off now */



		"tbegin. ;"

		"beq      failure;"



		/* Cause VMX unavail. Any VMX instruction */

		"vaddcuw  0,0,0;"



		"tend. ;"

		"b        %l[success];"



		/* Check VMX0 sanity after abort */

		"failure: ;"

		"lvx       1,  0, %[vmx0_ptr];"

		"vcmpequb. 2,  0, 1;"

		"bc        4, 24, %l[value_mismatch];"

		"b        %l[value_match];"

		:

		: [vmx0_ptr] "r"(&vmx0)

		: "r3"

		: success, value_match, value_mismatch

		);



	/* HTM aborted and VMX0 is corrupted */

value_mismatch:

	texasr = __builtin_get_texasr();



	printf("\n\n==============\n\n");

	printf("Failure with error: %lx\n",   _TEXASR_FAILURE_CODE(texasr));

	printf("Summary error     : %lx\n",   _TEXASR_FAILURE_SUMMARY(texasr));

	printf("TFIAR exact       : %lx\n\n", _TEXASR_TFIAR_EXACT(texasr));



	passed = 0;

	return NULL;



	/* HTM aborted but VMX0 is correct */

value_match:

//	printf("!");

	return NULL;



success:

//	printf(".");

	return NULL;

}



int tm_vmx_unavail_test()

{

	int threads;

	pthread_t *thread;



	SKIP_IF(!have_htm());



	passed = 1;



	threads = sysconf(_SC_NPROCESSORS_ONLN) * 4;

	thread = malloc(sizeof(pthread_t)*threads);

	if (!thread)

		return EXIT_FAILURE;



	for (uint64_t i = 0; i < threads; i++)

		pthread_create(&thread[i], NULL, &worker, NULL);



	for (uint64_t i = 0; i < threads; i++)

		pthread_join(thread[i], NULL);



	free(thread);



	return passed ? EXIT_SUCCESS : EXIT_FAILURE;

}





int main(int argc, char **argv)

{

	return test_harness(tm_vmx_unavail_test, "tm_vmx_unavail_test");

}