[v6,2/4] RISC-V: mm: Add tests for RISC-V mm

  Add tests that enforce mmap hint address behavior. mmap should default
to sv48. mmap will provide an address at the highest address space that
can fit into the hint address, unless the hint address is less than sv39
and not 0, then it will return a sv39 address. In addition, ensure that
rlimit changes do not cause mmap to fail.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
 tools/testing/selftests/riscv/Makefile        |   2 +-
 tools/testing/selftests/riscv/mm/.gitignore   |   1 +
 tools/testing/selftests/riscv/mm/Makefile     |  21 +++
 .../selftests/riscv/mm/testcases/mmap.c       | 133 ++++++++++++++++++
 4 files changed, 156 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/riscv/mm/.gitignore
 create mode 100644 tools/testing/selftests/riscv/mm/Makefile
 create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap.c
  

On Fri, Jul 14, 2023 at 6:55 PM Charlie Jenkins <charlie@rivosinc.com> wrote:
>
> Add tests that enforce mmap hint address behavior. mmap should default
> to sv48. mmap will provide an address at the highest address space that
> can fit into the hint address, unless the hint address is less than sv39
> and not 0, then it will return a sv39 address. In addition, ensure that
> rlimit changes do not cause mmap to fail.
>
> Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
> ---
>  tools/testing/selftests/riscv/Makefile        |   2 +-
>  tools/testing/selftests/riscv/mm/.gitignore   |   1 +
>  tools/testing/selftests/riscv/mm/Makefile     |  21 +++
>  .../selftests/riscv/mm/testcases/mmap.c       | 133 ++++++++++++++++++
>  4 files changed, 156 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/selftests/riscv/mm/.gitignore
>  create mode 100644 tools/testing/selftests/riscv/mm/Makefile
>  create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap.c
>
> diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile
> index 9dd629cc86aa..1b79da90396e 100644
> --- a/tools/testing/selftests/riscv/Makefile
> +++ b/tools/testing/selftests/riscv/Makefile
> @@ -5,7 +5,7 @@
>  ARCH ?= $(shell uname -m 2>/dev/null || echo not)
>
>  ifneq (,$(filter $(ARCH),riscv))
> -RISCV_SUBTARGETS ?= hwprobe vector
> +RISCV_SUBTARGETS ?= hwprobe vector mm
>  else
>  RISCV_SUBTARGETS :=
>  endif
> diff --git a/tools/testing/selftests/riscv/mm/.gitignore b/tools/testing/selftests/riscv/mm/.gitignore
> new file mode 100644
> index 000000000000..9a6f303edcd3
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/mm/.gitignore
> @@ -0,0 +1 @@
> +mmap
> diff --git a/tools/testing/selftests/riscv/mm/Makefile b/tools/testing/selftests/riscv/mm/Makefile
> new file mode 100644
> index 000000000000..cf68e63e7495
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/mm/Makefile
> @@ -0,0 +1,21 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# Originally tools/testing/selftests/arm64/signal
> +
> +# Additional include paths needed by kselftest.h and local headers
> +CFLAGS += -D_GNU_SOURCE -std=gnu99 -I.
> +
> +SRCS := $(filter-out testcases/testcases.c,$(wildcard testcases/*.c))
> +PROGS := $(patsubst %.c,%,$(SRCS))
> +
> +# Generated binaries to be installed by top KSFT script
> +TEST_GEN_PROGS := $(notdir $(PROGS))
> +
> +# Get Kernel headers installed and use them.
> +
> +# Including KSFT lib.mk here will also mangle the TEST_GEN_PROGS list
> +# to account for any OUTPUT target-dirs optionally provided by
> +# the toplevel makefile
> +include ../../lib.mk
> +
> +$(TEST_GEN_PROGS): $(PROGS)
> +       cp $(PROGS) $(OUTPUT)/
> diff --git a/tools/testing/selftests/riscv/mm/testcases/mmap.c b/tools/testing/selftests/riscv/mm/testcases/mmap.c
> new file mode 100644
> index 000000000000..d8e751f7b8c9
> --- /dev/null
> +++ b/tools/testing/selftests/riscv/mm/testcases/mmap.c
> @@ -0,0 +1,133 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +#include <sys/mman.h>
> +#include <sys/resource.h>
> +#include <sys/time.h>
> +
> +#include "../../kselftest_harness.h"
> +struct addresses {
> +       int *no_hint;
> +       int *on_37_addr;
> +       int *on_38_addr;
> +       int *on_46_addr;
> +       int *on_47_addr;
> +       int *on_55_addr;
> +       int *on_56_addr;
> +};
> +
> +void do_mmaps(struct addresses *mmap_addresses)
> +{
> +       // Place all of the hint addresses on the boundaries of mmap
> +       // sv39, sv48, sv57
> +       // User addresses end at 1<<38, 1<<47, 1<<56 respectively

Doesn't checkpatch complain about those comments? Shouldn't you use /*
*/ instead?

> +       void *on_37_bits = (void *)(1UL << 37);
> +       void *on_38_bits = (void *)(1UL << 38);
> +       void *on_46_bits = (void *)(1UL << 46);
> +       void *on_47_bits = (void *)(1UL << 47);
> +       void *on_55_bits = (void *)(1UL << 55);
> +       void *on_56_bits = (void *)(1UL << 56);
> +
> +       int prot = PROT_READ | PROT_WRITE;
> +       int flags = MAP_PRIVATE | MAP_ANONYMOUS;
> +
> +       mmap_addresses->no_hint =
> +               mmap(NULL, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_37_addr =
> +               mmap(on_37_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_38_addr =
> +               mmap(on_38_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_46_addr =
> +               mmap(on_46_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_47_addr =
> +               mmap(on_47_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_55_addr =
> +               mmap(on_55_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_56_addr =
> +               mmap(on_56_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +}
> +
> +TEST(default_rlimit)
> +{
> +// Only works on 64 bit
> +#if __riscv_xlen == 64
> +       struct addresses mmap_addresses;
> +
> +       do_mmaps(&mmap_addresses);
> +
> +       EXPECT_NE(mmap_addresses.no_hint, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_37_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_38_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_46_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_47_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_55_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_56_addr, MAP_FAILED);
> +
> +       EXPECT_LT((unsigned long)mmap_addresses.no_hint, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_37_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_38_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_46_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_47_addr, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_55_addr, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_56_addr, 1UL << 56);
> +#endif
> +}
> +
> +TEST(zero_rlimit)
> +{
> +// Only works on 64 bit
> +#if __riscv_xlen == 64
> +       struct addresses mmap_addresses;
> +       struct rlimit rlim_new = { .rlim_cur = 0, .rlim_max = RLIM_INFINITY };
> +
> +       setrlimit(RLIMIT_STACK, &rlim_new);
> +
> +       do_mmaps(&mmap_addresses);
> +
> +       EXPECT_NE(mmap_addresses.no_hint, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_37_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_38_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_46_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_47_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_55_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_56_addr, MAP_FAILED);
> +
> +       EXPECT_LT((unsigned long)mmap_addresses.no_hint, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_37_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_38_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_46_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_47_addr, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_55_addr, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_56_addr, 1UL << 56);
> +#endif
> +}
> +
> +TEST(infinite_rlimit)
> +{
> +// Only works on 64 bit
> +#if __riscv_xlen == 64
> +       struct addresses mmap_addresses;
> +       struct rlimit rlim_new = { .rlim_cur = RLIM_INFINITY,
> +                                  .rlim_max = RLIM_INFINITY };
> +
> +       setrlimit(RLIMIT_STACK, &rlim_new);
> +
> +       do_mmaps(&mmap_addresses);
> +
> +       EXPECT_NE(mmap_addresses.no_hint, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_37_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_38_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_46_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_47_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_55_addr, MAP_FAILED);
> +       EXPECT_NE(mmap_addresses.on_56_addr, MAP_FAILED);
> +
> +       EXPECT_LT((unsigned long)mmap_addresses.no_hint, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_37_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_38_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_46_addr, 1UL << 38);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_47_addr, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_55_addr, 1UL << 47);
> +       EXPECT_LT((unsigned long)mmap_addresses.on_56_addr, 1UL << 56);
> +#endif
> +}
> +
> +TEST_HARNESS_MAIN
> --
> 2.41.0
>