selftests/powerpc: Move Hash MMU check to utilities

This moves a function to test if the MMU is in Hash mode
under the generic test utilities.

Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200604125610.649668-3-sandipan@linux.ibm.com

tools/testing/selftests/powerpc/include/utils.h

@@ -60,6 +60,7 @@ static inline bool have_hwcap2(unsigned long ftr2)
 #endif
 
 bool is_ppc64le(void);
+int using_hash_mmu(bool *using_hash);
 
 /* Yes, this is evil */
 #define FAIL_IF(x)						\

tools/testing/selftests/powerpc/mm/Makefile

@@ -10,7 +10,7 @@ TEST_GEN_FILES := tempfile
 top_srcdir = ../../../../..
 include ../../lib.mk
 
-$(TEST_GEN_PROGS): ../harness.c
+$(TEST_GEN_PROGS): ../harness.c ../utils.c
 
 $(OUTPUT)/prot_sao: ../utils.c
 

tools/testing/selftests/powerpc/mm/bad_accesses.c

@@ -64,34 +64,6 @@ int bad_access(char *p, bool write)
 	return 0;
 }
 
-static int using_hash_mmu(bool *using_hash)
-{
-	char line[128];
-	FILE *f;
-	int rc;
-
-	f = fopen("/proc/cpuinfo", "r");
-	FAIL_IF(!f);
-
-	rc = 0;
-	while (fgets(line, sizeof(line), f) != NULL) {
-		if (strcmp(line, "MMU		: Hash\n") == 0) {
-			*using_hash = true;
-			goto out;
-		}
-
-		if (strcmp(line, "MMU		: Radix\n") == 0) {
-			*using_hash = false;
-			goto out;
-		}
-	}
-
-	rc = -1;
-out:
-	fclose(f);
-	return rc;
-}
-
 static int test(void)
 {
 	unsigned long i, j, addr, region_shift, page_shift, page_size;

tools/testing/selftests/powerpc/utils.c

@@ -293,3 +293,31 @@ void set_dscr(unsigned long val)
 
 	asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
 }
+
+int using_hash_mmu(bool *using_hash)
+{
+	char line[128];
+	FILE *f;
+	int rc;
+
+	f = fopen("/proc/cpuinfo", "r");
+	FAIL_IF(!f);
+
+	rc = 0;
+	while (fgets(line, sizeof(line), f) != NULL) {
+		if (strcmp(line, "MMU		: Hash\n") == 0) {
+			*using_hash = true;
+			goto out;
+		}
+
+		if (strcmp(line, "MMU		: Radix\n") == 0) {
+			*using_hash = false;
+			goto out;
+		}
+	}
+
+	rc = -1;
+out:
+	fclose(f);
+	return rc;
+}