[PATCH] selftests/powerpc/mm: Add a test for virtual address mapping

[Anshuman Khandual <khandual@linux.vnet.ibm.com>]

This verifies virtual address mapping below and above the
128TB range and makes sure that address returned are within
the expected range depending upon the hint passed from the
user space.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
Tested this on latest ppc-next with Aneesh's yesterday's patch
which can be found at https://patchwork.ozlabs.org/patch/749510/

 tools/testing/selftests/powerpc/mm/.gitignore |  3 +-
 tools/testing/selftests/powerpc/mm/Makefile   |  2 +-
 tools/testing/selftests/powerpc/mm/vaddr.c    | 89 +++++++++++++++++++++++++++
 3 files changed, 92 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/powerpc/mm/vaddr.c

diff --git a/tools/testing/selftests/powerpc/mm/.gitignore b/tools/testing/selftests/powerpc/mm/.gitignore
index e715a3f..af1f31f 100644
--- a/tools/testing/selftests/powerpc/mm/.gitignore
+++ b/tools/testing/selftests/powerpc/mm/.gitignore
@@ -1,4 +1,5 @@
 hugetlb_vs_thp_test
 subpage_prot
 tempfile
-prot_sao
\ No newline at end of file
+prot_sao
+vaddr
diff --git a/tools/testing/selftests/powerpc/mm/Makefile b/tools/testing/selftests/powerpc/mm/Makefile
index 1cffe54..7345db2 100644
--- a/tools/testing/selftests/powerpc/mm/Makefile
+++ b/tools/testing/selftests/powerpc/mm/Makefile
@@ -1,7 +1,7 @@
 noarg:
 	$(MAKE) -C ../
 
-TEST_GEN_PROGS := hugetlb_vs_thp_test subpage_prot prot_sao
+TEST_GEN_PROGS := hugetlb_vs_thp_test subpage_prot prot_sao vaddr
 TEST_GEN_FILES := tempfile
 
 include ../../lib.mk
diff --git a/tools/testing/selftests/powerpc/mm/vaddr.c b/tools/testing/selftests/powerpc/mm/vaddr.c
new file mode 100644
index 0000000..d6485e9
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mm/vaddr.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2017, Anshuman Khandual, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <numaif.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+#include "utils.h"
+
+#define PAGE_SIZE        65536UL  /* 64KB */
+#define MAP_SIZE_16GB    262144UL /* 16GB  */
+#define NR_SLICES_128TB  8192UL   /* 128TB */
+#define NR_SLICES_384TB  24576UL  /* 384TB */
+#define ADDR_MARK_128TB  0x800000000000UL /* Beyond 128TB */
+
+static char *hind_addr(void)
+{
+	int bits = 48 + rand() % 15;
+
+	return (char *) (1UL << bits);
+}
+
+static int validate_addr(char *ptr, int high_addr)
+{
+	unsigned long addr = (unsigned long) ptr;
+
+	if (high_addr) {
+		if (addr < ADDR_MARK_128TB) {
+			printf("Bad address %lx\n", addr);
+			return 1;
+		}
+		return 0;
+	}
+
+	if (addr > ADDR_MARK_128TB) {
+		printf("Bad address %lx\n", addr);
+		return 1;
+	}
+	return 0;
+}
+
+int vaddr(void)
+{
+	char *ptr[NR_SLICES_128TB];
+	char *hptr[NR_SLICES_384TB];
+	char *hint;
+	int  i;
+
+	for (i = 0; i < NR_SLICES_128TB; i++) {
+		ptr[i] = mmap(NULL, MAP_SIZE_16GB, PROT_READ | PROT_WRITE,
+					MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+		if (ptr[i] == MAP_FAILED)
+			break;
+
+		if (validate_addr(ptr[i], 0))
+			return 1;
+	}
+
+	for (i = 0; i < NR_SLICES_384TB; i++) {
+		hint = hind_addr();
+		hptr[i] = mmap(hint, MAP_SIZE_16GB, PROT_READ | PROT_WRITE,
+					MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+		if (hptr[i] == MAP_FAILED)
+			break;
+
+		if (validate_addr(hptr[i], 1))
+			return 1;
+	}
+
+	for (i = 0; i < NR_SLICES_128TB; i++)
+		munmap(ptr[i], MAP_SIZE_16GB);
+
+	for (i = 0; i < NR_SLICES_384TB; i++)
+		munmap(hptr[i], MAP_SIZE_16GB);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	return test_harness(vaddr, "vaddr-range");
+}
-- 
1.8.5.2