Commit 01bd2946 authored by Jordan Niethe's avatar Jordan Niethe Committed by Michael Ellerman
Browse files

selftests/powerpc: Allow choice of CI memory location in alignment_handler test 



The alignment handler selftest needs cache-inhibited memory and
currently /dev/fb0 is relied on to provided this. This prevents running
the test on systems without /dev/fb0 (e.g., mambo). Read the commandline
arguments for an optional path to be used instead, as well as an
optional offset to be for mmaping this path.

Signed-off-by: default avatarJordan Niethe <jniethe5@gmail.com>
Tested-by: default avatarAlistair Popple <alistair@popple.id.au>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200520021103.19798-1-jniethe5@gmail.com
parent 5f202c1a

tools/testing/selftests/powerpc/alignment/alignment_handler.c

+42 −21
Original line number Diff line number Diff line
@@ -9,7 +9,17 @@ 
 * This selftest exercises the powerpc alignment fault handler.

 *

 * We create two sets of source and destination buffers, one in regular memory,

 * the other cache-inhibited (we use /dev/fb0 for this).

 * the other cache-inhibited (by default we use /dev/fb0 for this, but an

 * alterative path for cache-inhibited memory may be provided).

 *

 * One way to get cache-inhibited memory is to use the "mem" kernel parameter

 * to limit the kernel to less memory than actually exists.  Addresses above

 * the limit may still be accessed but will be treated as cache-inhibited. For

 * example, if there is actually 4GB of memory and the parameter "mem=3GB" is

 * used, memory from address 0xC0000000 onwards is treated as cache-inhibited.

 * To access this region /dev/mem is used. The kernel should be configured

 * without CONFIG_STRICT_DEVMEM. In this case use:

 *         ./alignment_handler /dev/mem 0xc0000000

 *

 * We initialise the source buffers, then use whichever set of load/store

 * instructions is under test to copy bytes from the source buffers to the
@@ -53,6 +63,8 @@ int bufsize; 
int debug;

int testing;

volatile int gotsig;

char *cipath = "/dev/fb0";

long cioffset;



void sighandler(int sig, siginfo_t *info, void *ctx)

{
@@ -195,17 +207,18 @@ int do_test(char *test_name, void (*test_func)(char *, char *)) 


	printf("\tDoing %s:\t", test_name);



	fd = open("/dev/fb0", O_RDWR);

	fd = open(cipath, O_RDWR);

	if (fd < 0) {

		printf("\n");

		perror("Can't open /dev/fb0 now?");

		perror("Can't open ci file now?");

		return 1;

	}



	ci0 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,

		   fd, 0x0);

	ci1 = mmap(NULL, bufsize, PROT_WRITE, MAP_SHARED,

		   fd, bufsize);

	ci0 = mmap(NULL, bufsize, PROT_WRITE | PROT_READ, MAP_SHARED,

		   fd, cioffset);

	ci1 = mmap(NULL, bufsize, PROT_WRITE | PROT_READ, MAP_SHARED,

		   fd, cioffset + bufsize);



	if ((ci0 == MAP_FAILED) || (ci1 == MAP_FAILED)) {

		printf("\n");

		perror("mmap failed");
@@ -270,11 +283,11 @@ int do_test(char *test_name, void (*test_func)(char *, char *)) 
	return rc;

}



static bool can_open_fb0(void)

static bool can_open_cifile(void)

{

	int fd;



	fd = open("/dev/fb0", O_RDWR);

	fd = open(cipath, O_RDWR);

	if (fd < 0)

		return false;
@@ -286,7 +299,7 @@ int test_alignment_handler_vsx_206(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());

	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));



	printf("VSX: 2.06B\n");
@@ -304,7 +317,7 @@ int test_alignment_handler_vsx_207(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());

	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));



	printf("VSX: 2.07B\n");
@@ -320,7 +333,7 @@ int test_alignment_handler_vsx_300(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());



	SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_00));

	printf("VSX: 3.00B\n");
@@ -352,7 +365,7 @@ int test_alignment_handler_integer(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());



	printf("Integer\n");

	LOAD_DFORM_TEST(lbz);
@@ -408,7 +421,7 @@ int test_alignment_handler_integer_206(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());

	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));



	printf("Integer: 2.06\n");
@@ -423,7 +436,7 @@ int test_alignment_handler_vmx(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());

	SKIP_IF(!have_hwcap(PPC_FEATURE_HAS_ALTIVEC));



	printf("VMX\n");
@@ -451,7 +464,7 @@ int test_alignment_handler_fp(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());



	printf("Floating point\n");

	LOAD_FLOAT_DFORM_TEST(lfd);
@@ -479,7 +492,7 @@ int test_alignment_handler_fp_205(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());

	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_05));



	printf("Floating point: 2.05\n");
@@ -497,7 +510,7 @@ int test_alignment_handler_fp_206(void) 
{

	int rc = 0;



	SKIP_IF(!can_open_fb0());

	SKIP_IF(!can_open_cifile());

	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));



	printf("Floating point: 2.06\n");
@@ -509,11 +522,12 @@ int test_alignment_handler_fp_206(void) 


void usage(char *prog)

{

	printf("Usage: %s [options]\n", prog);

	printf("Usage: %s [options] [path [offset]]\n", prog);

	printf("  -d	Enable debug error output\n");

	printf("\n");

	printf("This test requires a POWER8 or POWER9 CPU and a usable ");

	printf("framebuffer at /dev/fb0.\n");

	printf("This test requires a POWER8 or POWER9 CPU and either a ");

	printf("usable framebuffer at /dev/fb0 or the path to usable ");

	printf("cache-inhibited memory and optional offset to be provided\n");

}



int main(int argc, char *argv[])
@@ -533,6 +547,13 @@ int main(int argc, char *argv[]) 
			exit(1);

		}

	}

	argc -= optind;

	argv += optind;



	if (argc > 0)

		cipath = argv[0];

	if (argc > 1)

		cioffset = strtol(argv[1], 0, 0x10);



	bufsize = getpagesize();