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Commit d16af870 authored by Dave Martin's avatar Dave Martin Committed by Will Deacon
Browse files

arm64/sve: Factor out FPSIMD to SVE state conversion 



Currently we convert from FPSIMD to SVE register state in memory in
two places.

To ease future maintenance, let's consolidate this in one place.

Reviewed-by: default avatarJulien Grall <julien.grall@arm.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarDave Martin <Dave.Martin@arm.com>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 592700f0

arch/arm64/kernel/fpsimd.c

+14 −13
Original line number Diff line number Diff line
@@ -406,6 +406,18 @@ static __uint128_t arm64_cpu_to_le128(__uint128_t x) 


#define arm64_le128_to_cpu(x) arm64_cpu_to_le128(x)



static void __fpsimd_to_sve(void *sst, struct user_fpsimd_state const *fst,

			    unsigned int vq)

{

	unsigned int i;

	__uint128_t *p;



	for (i = 0; i < 32; ++i) {

		p = (__uint128_t *)ZREG(sst, vq, i);

		*p = arm64_cpu_to_le128(fst->vregs[i]);

	}

}



/*

 * Transfer the FPSIMD state in task->thread.uw.fpsimd_state to

 * task->thread.sve_state.
@@ -423,17 +435,12 @@ static void fpsimd_to_sve(struct task_struct *task) 
	unsigned int vq;

	void *sst = task->thread.sve_state;

	struct user_fpsimd_state const *fst = &task->thread.uw.fpsimd_state;

	unsigned int i;

	__uint128_t *p;



	if (!system_supports_sve())

		return;



	vq = sve_vq_from_vl(task->thread.sve_vl);

	for (i = 0; i < 32; ++i) {

		p = (__uint128_t *)ZREG(sst, vq, i);

		*p = arm64_cpu_to_le128(fst->vregs[i]);

	}

	__fpsimd_to_sve(sst, fst, vq);

}



/*
@@ -550,8 +557,6 @@ void sve_sync_from_fpsimd_zeropad(struct task_struct *task) 
	unsigned int vq;

	void *sst = task->thread.sve_state;

	struct user_fpsimd_state const *fst = &task->thread.uw.fpsimd_state;

	unsigned int i;

	__uint128_t *p;



	if (!test_tsk_thread_flag(task, TIF_SVE))

		return;
@@ -559,11 +564,7 @@ void sve_sync_from_fpsimd_zeropad(struct task_struct *task) 
	vq = sve_vq_from_vl(task->thread.sve_vl);



	memset(sst, 0, SVE_SIG_REGS_SIZE(vq));



	for (i = 0; i < 32; ++i) {

		p = (__uint128_t *)ZREG(sst, vq, i);

		*p = arm64_cpu_to_le128(fst->vregs[i]);

	}

	__fpsimd_to_sve(sst, fst, vq);

}



int sve_set_vector_length(struct task_struct *task,