openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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: Jordan Niethe <jniethe5@gmail.com>
Tested-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200520021103.19798-1-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe 2020-05-20 12:11:02 +10:00 committed by Michael Ellerman
parent 5f202c1a1d
commit 01bd294642
1 changed files with 42 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
tools/testing/selftests/powerpc/alignment/alignment_handler.c
View File

@ -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();