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

From: Alexandre Ghiti
Date: Thu Jul 20 2023 - 04:16:28 EST

On Fri, Jul 14, 2023 at 6:55 PM Charlie Jenkins <charlie@xxxxxxxxxxxx> 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@xxxxxxxxxxxx>
> ---
> 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
>