kselftest/arm64: Add FPMR coverage to fp-ptrace

Add coverage for FPMR to fp-ptrace. FPMR can be available independently of
SVE and SME, if SME is supported then FPMR is cleared by entering and
exiting streaming mode. As with other registers we generate random values
to load into the register, we restrict these to bitfields which are always
defined. We also leave bitfields where the valid values are affected by
the set of supported FP8 formats zero to reduce complexity, it is unlikely
that specific bitfields will be affected by ptrace issues.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241112-arm64-fp-ptrace-fpmr-v2-3-250b57c61254@kernel.org
[catalin.marinas@arm.com: use REG_FPMR instead of FPMR]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/tools/testing/selftests/arm64/fp/fp-ptrace-asm.S b/tools/testing/selftests/arm64/fp/fp-ptrace-asm.S
index 5e7e9c878f2ce797e3ba5f4033a42526830393e6..82c3ab70e1cf13178e622736c52ffa2413bf872a 100644 (file)
--- a/tools/testing/selftests/arm64/fp/fp-ptrace-asm.S
+++ b/tools/testing/selftests/arm64/fp/fp-ptrace-asm.S
@@ -71,14 +71,12 @@ check_sm_in:
        tbz     x7, #SVCR_SM_SHIFT, check_sve_in
 
        // Load FFR if we have FA64
-       mov     x4, #0
-       tbz     x0, #HAVE_FA64_SHIFT, load_sve
-       mov     x4, #1
+       ubfx    x4, x0, #HAVE_FA64_SHIFT, #1
        b       load_sve
 
        // SVE?
 check_sve_in:
-       tbz     x0, #HAVE_SVE_SHIFT, wait_for_writes
+       tbz     x0, #HAVE_SVE_SHIFT, check_fpmr_in
        mov     x4, #1
 
 load_sve:
@@ -143,6 +141,13 @@ load_sve:
        ldr     p14, [x7, #14, MUL VL]
        ldr     p15, [x7, #15, MUL VL]
 
+       // This has to come after we set PSTATE.SM
+check_fpmr_in:
+       tbz     x0, #HAVE_FPMR_SHIFT, wait_for_writes
+       adrp    x7, fpmr_in
+       ldr     x7, [x7, :lo12:fpmr_in]
+       msr     REG_FPMR, x7
+
 wait_for_writes:
        // Wait for the parent
        brk #0
@@ -166,6 +171,12 @@ wait_for_writes:
        stp     q28, q29, [x7, #16 * 28]
        stp     q30, q31, [x7, #16 * 30]
 
+       tbz     x0, #HAVE_FPMR_SHIFT, check_sme_out
+       mrs     x7, REG_FPMR
+       adrp    x6, fpmr_out
+       str     x7, [x6, :lo12:fpmr_out]
+
+check_sme_out:
        tbz     x0, #HAVE_SME_SHIFT, check_sve_out
 
        rdsvl   11, 1
@@ -197,9 +208,7 @@ check_sm_out:
        tbz     x7, #SVCR_SM_SHIFT, check_sve_out
 
        // Do we have FA64 and FFR?
-       mov     x4, #0
-       tbz     x0, #HAVE_FA64_SHIFT, read_sve
-       mov     x4, #1
+       ubfx    x4, x0, #HAVE_FA64_SHIFT, #1
        b       read_sve
 
        // SVE?

diff --git a/tools/testing/selftests/arm64/fp/fp-ptrace.c b/tools/testing/selftests/arm64/fp/fp-ptrace.c
index 56cf6e02c535b5c1cf1134c5b1973605c96024ee..4930e03a7b9903eab85a1e004354939f6a9fe9d4 100644 (file)
--- a/tools/testing/selftests/arm64/fp/fp-ptrace.c
+++ b/tools/testing/selftests/arm64/fp/fp-ptrace.c
@@ -31,6 +31,14 @@
 
 #include "fp-ptrace.h"
 
+#include <linux/bits.h>
+
+#define FPMR_LSCALE2_MASK                               GENMASK(37, 32)
+#define FPMR_NSCALE_MASK                                GENMASK(31, 24)
+#define FPMR_LSCALE_MASK                                GENMASK(22, 16)
+#define FPMR_OSC_MASK                                   GENMASK(15, 15)
+#define FPMR_OSM_MASK                                   GENMASK(14, 14)
+
 /* <linux/elf.h> and <sys/auxv.h> don't like each other, so: */
 #ifndef NT_ARM_SVE
 #define NT_ARM_SVE 0x405
@@ -48,11 +56,22 @@
 #define NT_ARM_ZT 0x40d
 #endif
 
+#ifndef NT_ARM_FPMR
+#define NT_ARM_FPMR 0x40e
+#endif
+
 #define ARCH_VQ_MAX 256
 
 /* VL 128..2048 in powers of 2 */
 #define MAX_NUM_VLS 5
 
+/*
+ * FPMR bits we can set without doing feature checks to see if values
+ * are valid.
+ */
+#define FPMR_SAFE_BITS (FPMR_LSCALE2_MASK | FPMR_NSCALE_MASK | \
+                       FPMR_LSCALE_MASK | FPMR_OSC_MASK | FPMR_OSM_MASK)
+
 #define NUM_FPR 32
 __uint128_t v_in[NUM_FPR];
 __uint128_t v_expected[NUM_FPR];
@@ -78,6 +97,8 @@ char zt_in[ZT_SIG_REG_BYTES];
 char zt_expected[ZT_SIG_REG_BYTES];
 char zt_out[ZT_SIG_REG_BYTES];
 
+uint64_t fpmr_in, fpmr_expected, fpmr_out;
+
 uint64_t sve_vl_out;
 uint64_t sme_vl_out;
 uint64_t svcr_in, svcr_expected, svcr_out;
@@ -128,6 +149,11 @@ static bool fa64_supported(void)
        return getauxval(AT_HWCAP2) & HWCAP2_SME_FA64;
 }
 
+static bool fpmr_supported(void)
+{
+       return getauxval(AT_HWCAP2) & HWCAP2_FPMR;
+}
+
 static bool compare_buffer(const char *name, void *out,
                           void *expected, size_t size)
 {
@@ -233,6 +259,8 @@ static void run_child(struct test_config *config)
                flags |= HAVE_SME2;
        if (fa64_supported())
                flags |= HAVE_FA64;
+       if (fpmr_supported())
+               flags |= HAVE_FPMR;
 
        load_and_save(flags);
 
@@ -321,6 +349,14 @@ static void read_child_regs(pid_t child)
                iov_child.iov_len = sizeof(zt_out);
                read_one_child_regs(child, "ZT", &iov_parent, &iov_child);
        }
+
+       if (fpmr_supported()) {
+               iov_parent.iov_base = &fpmr_out;
+               iov_parent.iov_len = sizeof(fpmr_out);
+               iov_child.iov_base = &fpmr_out;
+               iov_child.iov_len = sizeof(fpmr_out);
+               read_one_child_regs(child, "FPMR", &iov_parent, &iov_child);
+       }
 }
 
 static bool continue_breakpoint(pid_t child,
@@ -595,6 +631,26 @@ static bool check_ptrace_values_zt(pid_t child, struct test_config *config)
        return compare_buffer("initial ZT", buf, zt_in, ZT_SIG_REG_BYTES);
 }
 
+static bool check_ptrace_values_fpmr(pid_t child, struct test_config *config)
+{
+       uint64_t val;
+       struct iovec iov;
+       int ret;
+
+       if (!fpmr_supported())
+               return true;
+
+       iov.iov_base = &val;
+       iov.iov_len = sizeof(val);
+       ret = ptrace(PTRACE_GETREGSET, child, NT_ARM_FPMR, &iov);
+       if (ret != 0) {
+               ksft_print_msg("Failed to read initial FPMR: %s (%d)\n",
+                              strerror(errno), errno);
+               return false;
+       }
+
+       return compare_buffer("initial FPMR", &val, &fpmr_in, sizeof(val));
+}
 
 static bool check_ptrace_values(pid_t child, struct test_config *config)
 {
@@ -629,6 +685,9 @@ static bool check_ptrace_values(pid_t child, struct test_config *config)
        if (!check_ptrace_values_zt(child, config))
                pass = false;
 
+       if (!check_ptrace_values_fpmr(child, config))
+               pass = false;
+
        return pass;
 }
 
@@ -832,11 +891,18 @@ static void set_initial_values(struct test_config *config)
 {
        int vq = __sve_vq_from_vl(vl_in(config));
        int sme_vq = __sve_vq_from_vl(config->sme_vl_in);
+       bool sm_change;
 
        svcr_in = config->svcr_in;
        svcr_expected = config->svcr_expected;
        svcr_out = 0;
 
+       if (sme_supported() &&
+           (svcr_in & SVCR_SM) != (svcr_expected & SVCR_SM))
+               sm_change = true;
+       else
+               sm_change = false;
+
        fill_random(&v_in, sizeof(v_in));
        memcpy(v_expected, v_in, sizeof(v_in));
        memset(v_out, 0, sizeof(v_out));
@@ -883,6 +949,21 @@ static void set_initial_values(struct test_config *config)
                        memset(zt_expected, 0, ZT_SIG_REG_BYTES);
                memset(zt_out, 0, sizeof(zt_out));
        }
+
+       if (fpmr_supported()) {
+               fill_random(&fpmr_in, sizeof(fpmr_in));
+               fpmr_in &= FPMR_SAFE_BITS;
+
+               /* Entering or exiting streaming mode clears FPMR */
+               if (sm_change)
+                       fpmr_expected = 0;
+               else
+                       fpmr_expected = fpmr_in;
+       } else {
+               fpmr_in = 0;
+               fpmr_expected = 0;
+               fpmr_out = 0;
+       }
 }
 
 static bool check_memory_values(struct test_config *config)
@@ -933,6 +1014,12 @@ static bool check_memory_values(struct test_config *config)
        if (!compare_buffer("saved ZT", zt_out, zt_expected, ZT_SIG_REG_BYTES))
                pass = false;
 
+       if (fpmr_out != fpmr_expected) {
+               ksft_print_msg("Mismatch in saved FPMR: %lx != %lx\n",
+                              fpmr_out, fpmr_expected);
+               pass = false;
+       }
+
        return pass;
 }
 
@@ -1010,6 +1097,36 @@ static void fpsimd_write(pid_t child, struct test_config *test_config)
                               strerror(errno), errno);
 }
 
+static bool fpmr_write_supported(struct test_config *config)
+{
+       if (!fpmr_supported())
+               return false;
+
+       if (!sve_sme_same(config))
+               return false;
+
+       return true;
+}
+
+static void fpmr_write_expected(struct test_config *config)
+{
+       fill_random(&fpmr_expected, sizeof(fpmr_expected));
+       fpmr_expected &= FPMR_SAFE_BITS;
+}
+
+static void fpmr_write(pid_t child, struct test_config *config)
+{
+       struct iovec iov;
+       int ret;
+
+       iov.iov_len = sizeof(fpmr_expected);
+       iov.iov_base = &fpmr_expected;
+       ret = ptrace(PTRACE_SETREGSET, child, NT_ARM_FPMR, &iov);
+       if (ret != 0)
+               ksft_print_msg("Failed to write FPMR: %s (%d)\n",
+                              strerror(errno), errno);
+}
+
 static void sve_write_expected(struct test_config *config)
 {
        int vl = vl_expected(config);
@@ -1266,6 +1383,12 @@ static struct test_definition base_test_defs[] = {
                .set_expected_values = fpsimd_write_expected,
                .modify_values = fpsimd_write,
        },
+       {
+               .name = "FPMR write",
+               .supported = fpmr_write_supported,
+               .set_expected_values = fpmr_write_expected,
+               .modify_values = fpmr_write,
+       },
 };
 
 static struct test_definition sve_test_defs[] = {
@@ -1475,6 +1598,9 @@ int main(void)
        if (fa64_supported())
                ksft_print_msg("FA64 supported\n");
 
+       if (fpmr_supported())
+               ksft_print_msg("FPMR supported\n");
+
        ksft_set_plan(tests);
 
        /* Get signal handers ready before we start any children */

diff --git a/tools/testing/selftests/arm64/fp/fp-ptrace.h b/tools/testing/selftests/arm64/fp/fp-ptrace.h
index 36ca627e1980f6a384d9ed0f2e9d4bd32d90f893..c06919aaf1f70bee4b607f71e3213ef2ddf8b97d 100644 (file)
--- a/tools/testing/selftests/arm64/fp/fp-ptrace.h
+++ b/tools/testing/selftests/arm64/fp/fp-ptrace.h
@@ -14,10 +14,12 @@
 #define HAVE_SME_SHIFT         1
 #define HAVE_SME2_SHIFT                2
 #define HAVE_FA64_SHIFT                3
+#define HAVE_FPMR_SHIFT                4
 
 #define HAVE_SVE       (1 << HAVE_SVE_SHIFT)
 #define HAVE_SME       (1 << HAVE_SME_SHIFT)
 #define HAVE_SME2      (1 << HAVE_SME2_SHIFT)
 #define HAVE_FA64      (1 << HAVE_FA64_SHIFT)
+#define HAVE_FPMR      (1 << HAVE_FPMR_SHIFT)
 
 #endif

diff --git a/tools/testing/selftests/arm64/fp/sme-inst.h b/tools/testing/selftests/arm64/fp/sme-inst.h
index 9292bba5400bb81b8e34769fa3eb70811746d8b8..85b9184e0835c59dbd5674b0210e6b9a43c1be4c 100644 (file)
--- a/tools/testing/selftests/arm64/fp/sme-inst.h
+++ b/tools/testing/selftests/arm64/fp/sme-inst.h
@@ -5,6 +5,8 @@
 #ifndef SME_INST_H
 #define SME_INST_H
 
+#define REG_FPMR                                        S3_3_C4_C4_2
+
 /*
  * RDSVL X\nx, #\imm
  */