Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20230714165508.94561-1-charlie@rivosinc.com> <20230714165508.94561-3-charlie@rivosinc.com>
In-Reply-To: <20230714165508.94561-3-charlie@rivosinc.com>
From:   Alexandre Ghiti <alexghiti@rivosinc.com>
Date:   Thu, 20 Jul 2023 10:16:10 +0200
Message-ID: <CAHVXubhT1ixqw03r+6XtPO-0V5ff7a4r4xf2zOqTMDg8xtY0UA@mail.gmail.com>
Subject: Re: [PATCH v6 2/4] RISC-V: mm: Add tests for RISC-V mm
To:     Charlie Jenkins <charlie@rivosinc.com>
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        conor@kernel.org, paul.walmsley@sifive.com, palmer@rivosinc.com,
        aou@eecs.berkeley.edu, anup@brainfault.org,
        konstantin@linuxfoundation.org, linux-doc@vger.kernel.org,
        linux-kselftest@vger.kernel.org, linux-mm@kvack.org,
        mick@ics.forth.gr, jrtc27@jrtc27.com, rdunlap@infradead.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

On Fri, Jul 14, 2023 at 6:55=E2=80=AFPM Charlie Jenkins <charlie@rivosinc.c=
om> 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/selft=
ests/riscv/Makefile
> index 9dd629cc86aa..1b79da90396e 100644
> --- a/tools/testing/selftests/riscv/Makefile
> +++ b/tools/testing/selftests/riscv/Makefile
> @@ -5,7 +5,7 @@
>  ARCH ?=3D $(shell uname -m 2>/dev/null || echo not)
>
>  ifneq (,$(filter $(ARCH),riscv))
> -RISCV_SUBTARGETS ?=3D hwprobe vector
> +RISCV_SUBTARGETS ?=3D hwprobe vector mm
>  else
>  RISCV_SUBTARGETS :=3D
>  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/se=
lftests/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 +=3D -D_GNU_SOURCE -std=3Dgnu99 -I.
> +
> +SRCS :=3D $(filter-out testcases/testcases.c,$(wildcard testcases/*.c))
> +PROGS :=3D $(patsubst %.c,%,$(SRCS))
> +
> +# Generated binaries to be installed by top KSFT script
> +TEST_GEN_PROGS :=3D $(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/te=
sting/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 =3D (void *)(1UL << 37);
> +       void *on_38_bits =3D (void *)(1UL << 38);
> +       void *on_46_bits =3D (void *)(1UL << 46);
> +       void *on_47_bits =3D (void *)(1UL << 47);
> +       void *on_55_bits =3D (void *)(1UL << 55);
> +       void *on_56_bits =3D (void *)(1UL << 56);
> +
> +       int prot =3D PROT_READ | PROT_WRITE;
> +       int flags =3D MAP_PRIVATE | MAP_ANONYMOUS;
> +
> +       mmap_addresses->no_hint =3D
> +               mmap(NULL, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_37_addr =3D
> +               mmap(on_37_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_38_addr =3D
> +               mmap(on_38_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_46_addr =3D
> +               mmap(on_46_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_47_addr =3D
> +               mmap(on_47_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_55_addr =3D
> +               mmap(on_55_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +       mmap_addresses->on_56_addr =3D
> +               mmap(on_56_bits, 5 * sizeof(int), prot, flags, 0, 0);
> +}
> +
> +TEST(default_rlimit)
> +{
> +// Only works on 64 bit
> +#if __riscv_xlen =3D=3D 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 =3D=3D 64
> +       struct addresses mmap_addresses;
> +       struct rlimit rlim_new =3D { .rlim_cur =3D 0, .rlim_max =3D 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 =3D=3D 64
> +       struct addresses mmap_addresses;
> +       struct rlimit rlim_new =3D { .rlim_cur =3D RLIM_INFINITY,
> +                                  .rlim_max =3D 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
>