From: Paul Mackerras <pau...@samba.org>
Signed-off-by: Paul Mackerras <pau...@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
---
tools/testing/selftests/powerpc/mm/Makefile | 2 +-
tools/testing/selftests/powerpc/mm/subpage_prot.c | 201 ++++++++++++++++++++++
2 files changed, 202 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/mm/subpage_prot.c
diff --git a/tools/testing/selftests/powerpc/mm/Makefile
b/tools/testing/selftests/powerpc/mm/Makefile
index 357ccbd6bad9..fb00c6f7d675 100644
--- a/tools/testing/selftests/powerpc/mm/Makefile
+++ b/tools/testing/selftests/powerpc/mm/Makefile
@@ -1,7 +1,7 @@
noarg:
$(MAKE) -C ../
-PROGS := hugetlb_vs_thp_test
+PROGS := hugetlb_vs_thp_test subpage_prot
all: $(PROGS)
diff --git a/tools/testing/selftests/powerpc/mm/subpage_prot.c
b/tools/testing/selftests/powerpc/mm/subpage_prot.c
new file mode 100644
index 000000000000..62f0db3e3fb2
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mm/subpage_prot.c
@@ -0,0 +1,201 @@
+/*
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <sys/ptrace.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <ucontext.h>
+#include <assert.h>
+#include <fcntl.h>
+
+#include "utils.h"
+
+void *mallocblock;
+unsigned long mallocsize;
+char *file_name;
+void *fileblock;
+off_t filesize;
+
+int in_test;
+volatile int faulted;
+volatile void *dar;
+int errors;
+
+static void segv(int signum, siginfo_t *info, void *ctxt_v)
+{
+ ucontext_t *ctxt = (ucontext_t *)ctxt_v;
+ struct pt_regs *regs = ctxt->uc_mcontext.regs;
+
+ if (!in_test) {
+ fprintf(stderr, "Segfault outside of test !\n");
+ exit(1);
+ }
+ faulted = 1;
+ dar = (void *)regs->dar;
+ regs->nip += 4;
+}
+
+static inline void do_read(const volatile void *addr)
+{
+ int ret;
+
+ asm volatile("lwz %0,0(%1); twi 0,%0,0; isync;\n"
+ : "=r" (ret) : "r" (addr) : "memory");
+}
+
+static inline void do_write(const volatile void *addr)
+{
+ int val = 0x1234567;
+
+ asm volatile("stw %0,0(%1); sync; \n"
+ : : "r" (val), "r" (addr) : "memory");
+}
+
+static inline void check_faulted(void *addr, long page, long subpage, int
write)
+{
+ int want_fault = (subpage == ((page + 3) % 16));
+
+ if (write)
+ want_fault |= (subpage == ((page + 1) % 16));
+
+ if (faulted != want_fault) {
+ printf("Failed at 0x%p (p=%ld,sp=%ld,w=%d), want=%s, got=%s
!\n",
+ addr, page, subpage, write,
+ want_fault ? "fault" : "pass",
+ faulted ? "fault" : "pass");
+ ++errors;
+ }
+ if (faulted) {
+ if (dar != addr) {
+ printf("Fault expected at 0x%p and happened at 0x%p
!\n",
+ addr, dar);
+ }
+ faulted = 0;
+ asm volatile("sync" : : : "memory");
+ }
+}
+
+static int run_test(void *addr, unsigned long size)
+{
+ unsigned int *map;
+ long i, j, pages, err;
+
+ pages = size / 0x10000;
+ map = malloc(pages * 4);
+ assert(map);
+
+ /* for each page, mark subpage i % 16 read only and subpage
+ * (i + 3) % 16 inaccessible
+ */
+ for (i = 0; i < pages; i++)
+ map[i] = (0x40000000 >> (((i + 1) * 2) % 32)) |
+ (0xc0000000 >> (((i + 3) * 2) % 32));
+ err = syscall(310, addr, size, map);
+ if (err) {
+ perror("subpage_perm");
+ return 1;
+ }
+ free(map);
+
+ in_test = 1;
+ errors = 0;
+ for (i = 0; i < pages; i++)
+ for (j = 0; j < 16; j++, addr += 0x1000) {
+ do_read(addr);
+ check_faulted(addr, i, j, 0);
+ do_write(addr);
+ check_faulted(addr, i, j, 1);
+ }
+ in_test = 0;
+ if (errors) {
+ printf("%d errors detected\n", errors);
+ return 1;
+ }
+ return 0;
+}
+
+int test_anon(void)
+{
+ unsigned long align;
+
+ if (getpagesize() != 0x10000) {
+ fprintf(stderr, "Kernel page size must be 64K!\n");
+ return 1;
+ }
+
+ struct sigaction act = {
+ .sa_sigaction = segv,
+ .sa_flags = SA_SIGINFO
+ };
+ sigaction(SIGSEGV, &act, NULL);
+
+ mallocsize = 4*16*1024*1024;
+ posix_memalign(&mallocblock, 64*1024, mallocsize);
+ assert(mallocblock);
+ align = (unsigned long)mallocblock;
+ if (align & 0xffff)
+ align = (align | 0xffff) + 1;
+ mallocblock = (void *)align;
+
+ printf("allocated malloc block of 0x%lx bytes at 0x%p\n",
+ mallocsize, mallocblock);
+
+ printf("testing malloc block...\n");
+ return run_test(mallocblock, mallocsize);
+}
+
+int test_file(void)
+{
+ struct sigaction act = {
+ .sa_sigaction = segv,
+ .sa_flags = SA_SIGINFO
+ };
+ int fd = open(file_name, O_RDWR);
+
+ if (fd == -1) {
+ perror("failed to open file");
+ return 1;
+ }
+ sigaction(SIGSEGV, &act, NULL);
+
+
+ filesize = lseek(fd, 0, SEEK_END);
+ if (filesize & 0xffff)
+ filesize &= ~0xfffful;
+ fileblock = mmap(NULL, filesize, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fd, 0);
+ if (fileblock == MAP_FAILED) {
+ perror("failed to map file");
+ return 1;
+ }
+ printf("allocated %s for 0x%lx bytes at 0x%p\n",
+ file_name, filesize, fileblock);
+
+ printf("testing file map...\n");
+ return run_test(fileblock, filesize);
+}
+
+int main(int argc, char *argv[])
+{
+ test_harness(test_anon, "subpage_prot_anon");
+ if (argc > 1) {
+ file_name = argv[1];
+ test_harness(test_file, "subpage_prot_file");
+ }
+ return 0;
+}
--
2.1.0
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