diff options
| author | Mark Brown <broonie@kernel.org> | 2023-01-16 16:04:44 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2023-01-20 12:23:06 +0000 |
| commit | d6138b4adc70729404efeb0133bc9f6e9ad78d03 (patch) | |
| tree | 635f2c1466a1569d7fcb9eb939c0537be4f89571 /arch/arm64/include/asm/fpsimd.h | |
| parent | d4913eee152d3ffaf9a1e70073bc15e773625685 (diff) | |
arm64/sme: Provide storage for ZT0
When the system supports SME2 there is an additional register ZT0 which
we must store when the task is using SME. Since ZT0 is accessible only
when PSTATE.ZA is set just like ZA we allocate storage for it along with
ZA, increasing the allocation size for the memory region where we store
ZA and storing the data for ZT after that for ZA.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-9-f2fa0aef982f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/fpsimd.h')
| -rw-r--r-- | arch/arm64/include/asm/fpsimd.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index 2a66e3b94553..8df769c20677 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -105,6 +105,13 @@ static inline void *sve_pffr(struct thread_struct *thread) return (char *)thread->sve_state + sve_ffr_offset(vl); } +static inline void *thread_zt_state(struct thread_struct *thread) +{ + /* The ZT register state is stored immediately after the ZA state */ + unsigned int sme_vq = sve_vq_from_vl(thread_get_sme_vl(thread)); + return thread->sme_state + ZA_SIG_REGS_SIZE(sme_vq); +} + extern void sve_save_state(void *state, u32 *pfpsr, int save_ffr); extern void sve_load_state(void const *state, u32 const *pfpsr, int restore_ffr); @@ -354,6 +361,9 @@ extern unsigned int sme_get_vl(void); extern int sme_set_current_vl(unsigned long arg); extern int sme_get_current_vl(void); +/* Will move with signal support */ +#define ZT_SIG_REG_SIZE 512 + /* * Return how many bytes of memory are required to store the full SME * specific state for task, given task's currently configured vector @@ -366,6 +376,9 @@ static inline size_t sme_state_size(struct task_struct const *task) size = ZA_SIG_REGS_SIZE(sve_vq_from_vl(vl)); + if (system_supports_sme2()) + size += ZT_SIG_REG_SIZE; + return size; } |