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arm64/sme: Implement streaming SVE context switching

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When in streaming mode we need to save and restore the streaming mode
SVE register state rather than the regular SVE register state. This uses
the streaming mode vector length and omits FFR but is otherwise identical,
if TIF_SVE is enabled when we are in streaming mode then streaming mode
takes precedence.

This does not handle use of streaming SVE state with KVM, ptrace or
signals. This will be updated in further patches.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220419112247.711548-15-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2022-04-19 12:22:22 +01:00
committed by Catalin Marinas
parent b40c559b45
commit af7167d6d2
6 changed files with 139 additions and 26 deletions
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10
arch/arm64/include/asm/processor.h
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@@ -184,6 +184,11 @@ static inline unsigned int thread_get_sve_vl(struct thread_struct *thread)
return thread_get_vl(thread, ARM64_VEC_SVE);
}
static inline unsigned int thread_get_sme_vl(struct thread_struct *thread)
{
return thread_get_vl(thread, ARM64_VEC_SME);
}
unsigned int task_get_vl(const struct task_struct *task, enum vec_type type);
void task_set_vl(struct task_struct *task, enum vec_type type,
unsigned long vl);
@@ -197,6 +202,11 @@ static inline unsigned int task_get_sve_vl(const struct task_struct *task)
return task_get_vl(task, ARM64_VEC_SVE);
}
static inline unsigned int task_get_sme_vl(const struct task_struct *task)
{
return task_get_vl(task, ARM64_VEC_SME);
}
static inline void task_set_sve_vl(struct task_struct *task, unsigned long vl)
{
task_set_vl(task, ARM64_VEC_SVE, vl);