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kselftest/arm64: Add SME2 coverage to syscall-abi

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Verify that ZT0 is preserved over syscalls when it is present and
PSTATE.ZA is set.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-19-f2fa0aef982f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2023-01-16 16:04:54 +00:00 committed by Catalin Marinas
parent 18f8729ab3
commit 49886aa9ab
2 changed files with 80 additions and 3 deletions
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43
tools/testing/selftests/arm64/abi/syscall-abi-asm.S
View File

@ -23,6 +23,9 @@
.arch_extension sve
#define ID_AA64SMFR0_EL1_SMEver_SHIFT 56
#define ID_AA64SMFR0_EL1_SMEver_WIDTH 4
/*
* LDR (vector to ZA array):
* LDR ZA[\nw, #\offset], [X\nxbase, #\offset, MUL VL]
@ -45,6 +48,26 @@
| ((\offset) & 7)
.endm
/*
* LDR (ZT0)
*
* LDR ZT0, nx
*/
.macro _ldr_zt nx
.inst 0xe11f8000 \
| (((\nx) & 0x1f) << 5)
.endm
/*
* STR (ZT0)
*
* STR ZT0, nx
*/
.macro _str_zt nx
.inst 0xe13f8000 \
| (((\nx) & 0x1f) << 5)
.endm
.globl do_syscall
do_syscall:
// Store callee saved registers x19-x29 (80 bytes) plus x0 and x1
@ -64,7 +87,7 @@ do_syscall:
msr S3_3_C4_C2_2, x2
1:
// Load ZA if it's enabled - uses x12 as scratch due to SME LDR
// Load ZA and ZT0 if enabled - uses x12 as scratch due to SME LDR
tbz x2, #SVCR_ZA_SHIFT, 1f
mov w12, #0
ldr x2, =za_in
@ -73,6 +96,15 @@ do_syscall:
add x12, x12, #1
cmp x1, x12
bne 2b
// ZT0
mrs x2, S3_0_C0_C4_5 // ID_AA64SMFR0_EL1
ubfx x2, x2, #ID_AA64SMFR0_EL1_SMEver_SHIFT, \
#ID_AA64SMFR0_EL1_SMEver_WIDTH
cbz x2, 1f
adrp x2, zt_in
add x2, x2, :lo12:zt_in
_ldr_zt 2
1:
// Load GPRs x8-x28, and save our SP/FP for later comparison
@ -235,6 +267,15 @@ do_syscall:
add x12, x12, #1
cmp x1, x12
bne 2b
// ZT0
mrs x2, S3_0_C0_C4_5 // ID_AA64SMFR0_EL1
ubfx x2, x2, #ID_AA64SMFR0_EL1_SMEver_SHIFT, \
#ID_AA64SMFR0_EL1_SMEver_WIDTH
cbz x2, 1f
adrp x2, zt_out
add x2, x2, :lo12:zt_out
_str_zt 2
1:
// Save the SVE state if we have some

40
tools/testing/selftests/arm64/abi/syscall-abi.c
View File

@ -311,6 +311,35 @@ static int check_za(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
return errors;
}
uint8_t zt_in[ZT_SIG_REG_BYTES] __attribute__((aligned(16)));
uint8_t zt_out[ZT_SIG_REG_BYTES] __attribute__((aligned(16)));
static void setup_zt(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
uint64_t svcr)
{
fill_random(zt_in, sizeof(zt_in));
memset(zt_out, 0, sizeof(zt_out));
}
static int check_zt(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
uint64_t svcr)
{
int errors = 0;
if (!(getauxval(AT_HWCAP2) & HWCAP2_SME2))
return 0;
if (!(svcr & SVCR_ZA_MASK))
return 0;
if (memcmp(zt_in, zt_out, sizeof(zt_in)) != 0) {
ksft_print_msg("SME VL %d ZT does not match\n", sme_vl);
errors++;
}
return errors;
}
typedef void (*setup_fn)(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
uint64_t svcr);
typedef int (*check_fn)(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
@ -334,6 +363,7 @@ static struct {
{ setup_ffr, check_ffr },
{ setup_svcr, check_svcr },
{ setup_za, check_za },
{ setup_zt, check_zt },
};
static bool do_test(struct syscall_cfg *cfg, int sve_vl, int sme_vl,
@ -474,6 +504,7 @@ int main(void)
{
int i;
int tests = 1; /* FPSIMD */
int sme_ver;
srandom(getpid());
@ -482,10 +513,15 @@ int main(void)
tests += (sve_count_vls() * sme_count_vls()) * 3;
ksft_set_plan(ARRAY_SIZE(syscalls) * tests);
if (getauxval(AT_HWCAP2) & HWCAP2_SME2)
sme_ver = 2;
else
sme_ver = 1;
if (getauxval(AT_HWCAP2) & HWCAP2_SME_FA64)
ksft_print_msg("SME with FA64\n");
ksft_print_msg("SME%d with FA64\n", sme_ver);
else if (getauxval(AT_HWCAP2) & HWCAP2_SME)
ksft_print_msg("SME without FA64\n");
ksft_print_msg("SME%d without FA64\n", sme_ver);
for (i = 0; i < ARRAY_SIZE(syscalls); i++)
test_one_syscall(&syscalls[i]);