arch/riscv/include/asm/vector.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Copyright (C) 2020 SiFive
  */

 #ifndef __ASM_RISCV_VECTOR_H
 #define __ASM_RISCV_VECTOR_H

 #include <linux/types.h>
 #include <uapi/asm-generic/errno.h>

 #ifdef CONFIG_RISCV_ISA_V

 #include <linux/stringify.h>
 #include <linux/sched.h>
 #include <linux/sched/task_stack.h>
 #include <asm/ptrace.h>
 #include <asm/cpufeature.h>
 #include <asm/csr.h>
 #include <asm/asm.h>

 extern unsigned long riscv_v_vsize;
 int riscv_v_setup_vsize(void);
 bool riscv_v_first_use_handler(struct pt_regs *regs);
 void kernel_vector_begin(void);
 void kernel_vector_end(void);
 void get_cpu_vector_context(void);
 void put_cpu_vector_context(void);
 void riscv_v_thread_free(struct task_struct *tsk);
 void __init riscv_v_setup_ctx_cache(void);
 void riscv_v_thread_alloc(struct task_struct *tsk);

 static inline u32 riscv_v_flags(void)
 {
 	return READ_ONCE(current->thread.riscv_v_flags);
 }

 static __always_inline bool has_vector(void)
 {
 	return riscv_has_extension_unlikely(RISCV_ISA_EXT_ZVE32X);
 }

 static inline void __riscv_v_vstate_clean(struct pt_regs *regs)
 {
 	regs->status = (regs->status & ~SR_VS) | SR_VS_CLEAN;
 }

 static inline void __riscv_v_vstate_dirty(struct pt_regs *regs)
 {
 	regs->status = (regs->status & ~SR_VS) | SR_VS_DIRTY;
 }

 static inline void riscv_v_vstate_off(struct pt_regs *regs)
 {
 	regs->status = (regs->status & ~SR_VS) | SR_VS_OFF;
 }

 static inline void riscv_v_vstate_on(struct pt_regs *regs)
 {
 	regs->status = (regs->status & ~SR_VS) | SR_VS_INITIAL;
 }

 static inline bool riscv_v_vstate_query(struct pt_regs *regs)
 {
 	return (regs->status & SR_VS) != 0;
 }

 static __always_inline void riscv_v_enable(void)
 {
 	csr_set(CSR_SSTATUS, SR_VS);
 }

 static __always_inline void riscv_v_disable(void)
 {
 	csr_clear(CSR_SSTATUS, SR_VS);
 }

 static __always_inline void __vstate_csr_save(struct __riscv_v_ext_state *dest)
 {
 	asm volatile (
 		"csrr	%0, " __stringify(CSR_VSTART) "\n\t"
 		"csrr	%1, " __stringify(CSR_VTYPE) "\n\t"
 		"csrr	%2, " __stringify(CSR_VL) "\n\t"
 		"csrr	%3, " __stringify(CSR_VCSR) "\n\t"
 		"csrr	%4, " __stringify(CSR_VLENB) "\n\t"
 		: "=r" (dest->vstart), "=r" (dest->vtype), "=r" (dest->vl),
 		  "=r" (dest->vcsr), "=r" (dest->vlenb) : :);
 }

 static __always_inline void __vstate_csr_restore(struct __riscv_v_ext_state *src)
 {
 	asm volatile (
 		".option push\n\t"
 		".option arch, +zve32x\n\t"
 		"vsetvl	 x0, %2, %1\n\t"
 		".option pop\n\t"
 		"csrw	" __stringify(CSR_VSTART) ", %0\n\t"
 		"csrw	" __stringify(CSR_VCSR) ", %3\n\t"
 		: : "r" (src->vstart), "r" (src->vtype), "r" (src->vl),
 		    "r" (src->vcsr) :);
 }

 static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to,
 					 void *datap)
 {
 	unsigned long vl;

 	riscv_v_enable();
 	__vstate_csr_save(save_to);
 	asm volatile (
 		".option push\n\t"
 		".option arch, +zve32x\n\t"
 		"vsetvli	%0, x0, e8, m8, ta, ma\n\t"
 		"vse8.v		v0, (%1)\n\t"
 		"add		%1, %1, %0\n\t"
 		"vse8.v		v8, (%1)\n\t"
 		"add		%1, %1, %0\n\t"
 		"vse8.v		v16, (%1)\n\t"
 		"add		%1, %1, %0\n\t"
 		"vse8.v		v24, (%1)\n\t"
 		".option pop\n\t"
 		: "=&r" (vl) : "r" (datap) : "memory");
 	riscv_v_disable();
 }

 static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_from,
 					    void *datap)
 {
 	unsigned long vl;

 	riscv_v_enable();
 	asm volatile (
 		".option push\n\t"
 		".option arch, +zve32x\n\t"
 		"vsetvli	%0, x0, e8, m8, ta, ma\n\t"
 		"vle8.v		v0, (%1)\n\t"
 		"add		%1, %1, %0\n\t"
 		"vle8.v		v8, (%1)\n\t"
 		"add		%1, %1, %0\n\t"
 		"vle8.v		v16, (%1)\n\t"
 		"add		%1, %1, %0\n\t"
 		"vle8.v		v24, (%1)\n\t"
 		".option pop\n\t"
 		: "=&r" (vl) : "r" (datap) : "memory");
 	__vstate_csr_restore(restore_from);
 	riscv_v_disable();
 }

 static inline void __riscv_v_vstate_discard(void)
 {
 	unsigned long vl, vtype_inval = 1UL << (BITS_PER_LONG - 1);

 	riscv_v_enable();
 	asm volatile (
 		".option push\n\t"
 		".option arch, +zve32x\n\t"
 		"vsetvli	%0, x0, e8, m8, ta, ma\n\t"
 		"vmv.v.i	v0, -1\n\t"
 		"vmv.v.i	v8, -1\n\t"
 		"vmv.v.i	v16, -1\n\t"
 		"vmv.v.i	v24, -1\n\t"
 		"vsetvl		%0, x0, %1\n\t"
 		".option pop\n\t"
 		: "=&r" (vl) : "r" (vtype_inval) : "memory");
 	riscv_v_disable();
 }

 static inline void riscv_v_vstate_discard(struct pt_regs *regs)
 {
 	if ((regs->status & SR_VS) == SR_VS_OFF)
 		return;

 	__riscv_v_vstate_discard();
 	__riscv_v_vstate_dirty(regs);
 }

 static inline void riscv_v_vstate_save(struct __riscv_v_ext_state *vstate,
 				       struct pt_regs *regs)
 {
 	if ((regs->status & SR_VS) == SR_VS_DIRTY) {
 		__riscv_v_vstate_save(vstate, vstate->datap);
 		__riscv_v_vstate_clean(regs);
 	}
 }

 static inline void riscv_v_vstate_restore(struct __riscv_v_ext_state *vstate,
 					  struct pt_regs *regs)
 {
 	if ((regs->status & SR_VS) != SR_VS_OFF) {
 		__riscv_v_vstate_restore(vstate, vstate->datap);
 		__riscv_v_vstate_clean(regs);
 	}
 }

 static inline void riscv_v_vstate_set_restore(struct task_struct *task,
 					      struct pt_regs *regs)
 {
 	if ((regs->status & SR_VS) != SR_VS_OFF) {
 		set_tsk_thread_flag(task, TIF_RISCV_V_DEFER_RESTORE);
 		riscv_v_vstate_on(regs);
 	}
 }

 #ifdef CONFIG_RISCV_ISA_V_PREEMPTIVE
 static inline bool riscv_preempt_v_dirty(struct task_struct *task)
 {
 	return !!(task->thread.riscv_v_flags & RISCV_PREEMPT_V_DIRTY);
 }

 static inline bool riscv_preempt_v_restore(struct task_struct *task)
 {
 	return !!(task->thread.riscv_v_flags & RISCV_PREEMPT_V_NEED_RESTORE);
 }

 static inline void riscv_preempt_v_clear_dirty(struct task_struct *task)
 {
 	barrier();
 	task->thread.riscv_v_flags &= ~RISCV_PREEMPT_V_DIRTY;
 }

 static inline void riscv_preempt_v_set_restore(struct task_struct *task)
 {
 	barrier();
 	task->thread.riscv_v_flags |= RISCV_PREEMPT_V_NEED_RESTORE;
 }

 static inline bool riscv_preempt_v_started(struct task_struct *task)
 {
 	return !!(task->thread.riscv_v_flags & RISCV_PREEMPT_V);
 }

 #else /* !CONFIG_RISCV_ISA_V_PREEMPTIVE */
 static inline bool riscv_preempt_v_dirty(struct task_struct *task) { return false; }
 static inline bool riscv_preempt_v_restore(struct task_struct *task) { return false; }
 static inline bool riscv_preempt_v_started(struct task_struct *task) { return false; }
 #define riscv_preempt_v_clear_dirty(tsk)	do {} while (0)
 #define riscv_preempt_v_set_restore(tsk)	do {} while (0)
 #endif /* CONFIG_RISCV_ISA_V_PREEMPTIVE */

 static inline void __switch_to_vector(struct task_struct *prev,
 				      struct task_struct *next)
 {
 	struct pt_regs *regs;

 	if (riscv_preempt_v_started(prev)) {
 		if (riscv_preempt_v_dirty(prev)) {
 			__riscv_v_vstate_save(&prev->thread.kernel_vstate,
 					      prev->thread.kernel_vstate.datap);
 			riscv_preempt_v_clear_dirty(prev);
 		}
 	} else {
 		regs = task_pt_regs(prev);
 		riscv_v_vstate_save(&prev->thread.vstate, regs);
 	}

 	if (riscv_preempt_v_started(next))
 		riscv_preempt_v_set_restore(next);
 	else
 		riscv_v_vstate_set_restore(next, task_pt_regs(next));
 }

 void riscv_v_vstate_ctrl_init(struct task_struct *tsk);
 bool riscv_v_vstate_ctrl_user_allowed(void);

 #else /* ! CONFIG_RISCV_ISA_V  */

 struct pt_regs;

 static inline int riscv_v_setup_vsize(void) { return -EOPNOTSUPP; }
 static __always_inline bool has_vector(void) { return false; }
 static inline bool riscv_v_first_use_handler(struct pt_regs *regs) { return false; }
 static inline bool riscv_v_vstate_query(struct pt_regs *regs) { return false; }
 static inline bool riscv_v_vstate_ctrl_user_allowed(void) { return false; }
 #define riscv_v_vsize (0)
 #define riscv_v_vstate_discard(regs)		do {} while (0)
 #define riscv_v_vstate_save(vstate, regs)	do {} while (0)
 #define riscv_v_vstate_restore(vstate, regs)	do {} while (0)
 #define __switch_to_vector(__prev, __next)	do {} while (0)
 #define riscv_v_vstate_off(regs)		do {} while (0)
 #define riscv_v_vstate_on(regs)			do {} while (0)
 #define riscv_v_thread_free(tsk)		do {} while (0)
 #define  riscv_v_setup_ctx_cache()		do {} while (0)
 #define riscv_v_thread_alloc(tsk)		do {} while (0)

 #endif /* CONFIG_RISCV_ISA_V */

 /*
  * Return the implementation's vlen value.
  *
  * riscv_v_vsize contains the value of "32 vector registers with vlenb length"
  * so rebuild the vlen value in bits from it.
  */
 static inline int riscv_vector_vlen(void)
 {
 	return riscv_v_vsize / 32 * 8;
 }

 #endif /* ! __ASM_RISCV_VECTOR_H */
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/*
	* Copyright (C) 2020 SiFive
	*/

	#ifndef __ASM_RISCV_VECTOR_H
	#define __ASM_RISCV_VECTOR_H

	#include <linux/types.h>
	#include <uapi/asm-generic/errno.h>

	#ifdef CONFIG_RISCV_ISA_V

	#include <linux/stringify.h>
	#include <linux/sched.h>
	#include <linux/sched/task_stack.h>
	#include <asm/ptrace.h>
	#include <asm/cpufeature.h>
	#include <asm/csr.h>
	#include <asm/asm.h>

	extern unsigned long riscv_v_vsize;
	int riscv_v_setup_vsize(void);
	bool riscv_v_first_use_handler(struct pt_regs *regs);
	void kernel_vector_begin(void);
	void kernel_vector_end(void);
	void get_cpu_vector_context(void);
	void put_cpu_vector_context(void);
	void riscv_v_thread_free(struct task_struct *tsk);
	void __init riscv_v_setup_ctx_cache(void);
	void riscv_v_thread_alloc(struct task_struct *tsk);

	static inline u32 riscv_v_flags(void)
	{
	return READ_ONCE(current->thread.riscv_v_flags);
	}

	static __always_inline bool has_vector(void)
	{
	return riscv_has_extension_unlikely(RISCV_ISA_EXT_ZVE32X);
	}

	static inline void __riscv_v_vstate_clean(struct pt_regs *regs)
	{
	regs->status = (regs->status & ~SR_VS) \| SR_VS_CLEAN;
	}

	static inline void __riscv_v_vstate_dirty(struct pt_regs *regs)
	{
	regs->status = (regs->status & ~SR_VS) \| SR_VS_DIRTY;
	}

	static inline void riscv_v_vstate_off(struct pt_regs *regs)
	{
	regs->status = (regs->status & ~SR_VS) \| SR_VS_OFF;
	}

	static inline void riscv_v_vstate_on(struct pt_regs *regs)
	{
	regs->status = (regs->status & ~SR_VS) \| SR_VS_INITIAL;
	}

	static inline bool riscv_v_vstate_query(struct pt_regs *regs)
	{
	return (regs->status & SR_VS) != 0;
	}

	static __always_inline void riscv_v_enable(void)
	{
	csr_set(CSR_SSTATUS, SR_VS);
	}

	static __always_inline void riscv_v_disable(void)
	{
	csr_clear(CSR_SSTATUS, SR_VS);
	}

	static __always_inline void __vstate_csr_save(struct __riscv_v_ext_state *dest)
	{
	asm volatile (
	"csrr %0, " __stringify(CSR_VSTART) "\n\t"
	"csrr %1, " __stringify(CSR_VTYPE) "\n\t"
	"csrr %2, " __stringify(CSR_VL) "\n\t"
	"csrr %3, " __stringify(CSR_VCSR) "\n\t"
	"csrr %4, " __stringify(CSR_VLENB) "\n\t"
	: "=r" (dest->vstart), "=r" (dest->vtype), "=r" (dest->vl),
	"=r" (dest->vcsr), "=r" (dest->vlenb) : :);
	}

	static __always_inline void __vstate_csr_restore(struct __riscv_v_ext_state *src)
	{
	asm volatile (
	".option push\n\t"
	".option arch, +zve32x\n\t"
	"vsetvl x0, %2, %1\n\t"
	".option pop\n\t"
	"csrw " __stringify(CSR_VSTART) ", %0\n\t"
	"csrw " __stringify(CSR_VCSR) ", %3\n\t"
	: : "r" (src->vstart), "r" (src->vtype), "r" (src->vl),
	"r" (src->vcsr) :);
	}

	static inline void __riscv_v_vstate_save(struct __riscv_v_ext_state *save_to,
	void *datap)
	{
	unsigned long vl;

	riscv_v_enable();
	__vstate_csr_save(save_to);
	asm volatile (
	".option push\n\t"
	".option arch, +zve32x\n\t"
	"vsetvli %0, x0, e8, m8, ta, ma\n\t"
	"vse8.v v0, (%1)\n\t"
	"add %1, %1, %0\n\t"
	"vse8.v v8, (%1)\n\t"
	"add %1, %1, %0\n\t"
	"vse8.v v16, (%1)\n\t"
	"add %1, %1, %0\n\t"
	"vse8.v v24, (%1)\n\t"
	".option pop\n\t"
	: "=&r" (vl) : "r" (datap) : "memory");
	riscv_v_disable();
	}

	static inline void __riscv_v_vstate_restore(struct __riscv_v_ext_state *restore_from,
	void *datap)
	{
	unsigned long vl;

	riscv_v_enable();
	asm volatile (
	".option push\n\t"
	".option arch, +zve32x\n\t"
	"vsetvli %0, x0, e8, m8, ta, ma\n\t"
	"vle8.v v0, (%1)\n\t"
	"add %1, %1, %0\n\t"
	"vle8.v v8, (%1)\n\t"
	"add %1, %1, %0\n\t"
	"vle8.v v16, (%1)\n\t"
	"add %1, %1, %0\n\t"
	"vle8.v v24, (%1)\n\t"
	".option pop\n\t"
	: "=&r" (vl) : "r" (datap) : "memory");
	__vstate_csr_restore(restore_from);
	riscv_v_disable();
	}

	static inline void __riscv_v_vstate_discard(void)
	{
	unsigned long vl, vtype_inval = 1UL << (BITS_PER_LONG - 1);

	riscv_v_enable();
	asm volatile (
	".option push\n\t"
	".option arch, +zve32x\n\t"
	"vsetvli %0, x0, e8, m8, ta, ma\n\t"
	"vmv.v.i v0, -1\n\t"
	"vmv.v.i v8, -1\n\t"
	"vmv.v.i v16, -1\n\t"
	"vmv.v.i v24, -1\n\t"
	"vsetvl %0, x0, %1\n\t"
	".option pop\n\t"
	: "=&r" (vl) : "r" (vtype_inval) : "memory");
	riscv_v_disable();
	}

	static inline void riscv_v_vstate_discard(struct pt_regs *regs)
	{
	if ((regs->status & SR_VS) == SR_VS_OFF)
	return;

	__riscv_v_vstate_discard();
	__riscv_v_vstate_dirty(regs);
	}

	static inline void riscv_v_vstate_save(struct __riscv_v_ext_state *vstate,
	struct pt_regs *regs)
	{
	if ((regs->status & SR_VS) == SR_VS_DIRTY) {
	__riscv_v_vstate_save(vstate, vstate->datap);
	__riscv_v_vstate_clean(regs);
	}
	}

	static inline void riscv_v_vstate_restore(struct __riscv_v_ext_state *vstate,
	struct pt_regs *regs)
	{
	if ((regs->status & SR_VS) != SR_VS_OFF) {
	__riscv_v_vstate_restore(vstate, vstate->datap);
	__riscv_v_vstate_clean(regs);
	}
	}

	static inline void riscv_v_vstate_set_restore(struct task_struct *task,
	struct pt_regs *regs)
	{
	if ((regs->status & SR_VS) != SR_VS_OFF) {
	set_tsk_thread_flag(task, TIF_RISCV_V_DEFER_RESTORE);
	riscv_v_vstate_on(regs);
	}
	}

	#ifdef CONFIG_RISCV_ISA_V_PREEMPTIVE
	static inline bool riscv_preempt_v_dirty(struct task_struct *task)
	{
	return !!(task->thread.riscv_v_flags & RISCV_PREEMPT_V_DIRTY);
	}

	static inline bool riscv_preempt_v_restore(struct task_struct *task)
	{
	return !!(task->thread.riscv_v_flags & RISCV_PREEMPT_V_NEED_RESTORE);
	}

	static inline void riscv_preempt_v_clear_dirty(struct task_struct *task)
	{
	barrier();
	task->thread.riscv_v_flags &= ~RISCV_PREEMPT_V_DIRTY;
	}

	static inline void riscv_preempt_v_set_restore(struct task_struct *task)
	{
	barrier();
	task->thread.riscv_v_flags \|= RISCV_PREEMPT_V_NEED_RESTORE;
	}

	static inline bool riscv_preempt_v_started(struct task_struct *task)
	{
	return !!(task->thread.riscv_v_flags & RISCV_PREEMPT_V);
	}

	#else /* !CONFIG_RISCV_ISA_V_PREEMPTIVE */
	static inline bool riscv_preempt_v_dirty(struct task_struct *task) { return false; }
	static inline bool riscv_preempt_v_restore(struct task_struct *task) { return false; }
	static inline bool riscv_preempt_v_started(struct task_struct *task) { return false; }
	#define riscv_preempt_v_clear_dirty(tsk) do {} while (0)
	#define riscv_preempt_v_set_restore(tsk) do {} while (0)
	#endif /* CONFIG_RISCV_ISA_V_PREEMPTIVE */

	static inline void __switch_to_vector(struct task_struct *prev,
	struct task_struct *next)
	{
	struct pt_regs *regs;

	if (riscv_preempt_v_started(prev)) {
	if (riscv_preempt_v_dirty(prev)) {
	__riscv_v_vstate_save(&prev->thread.kernel_vstate,
	prev->thread.kernel_vstate.datap);
	riscv_preempt_v_clear_dirty(prev);
	}
	} else {
	regs = task_pt_regs(prev);
	riscv_v_vstate_save(&prev->thread.vstate, regs);
	}

	if (riscv_preempt_v_started(next))
	riscv_preempt_v_set_restore(next);
	else
	riscv_v_vstate_set_restore(next, task_pt_regs(next));
	}

	void riscv_v_vstate_ctrl_init(struct task_struct *tsk);
	bool riscv_v_vstate_ctrl_user_allowed(void);

	#else /* ! CONFIG_RISCV_ISA_V */

	struct pt_regs;

	static inline int riscv_v_setup_vsize(void) { return -EOPNOTSUPP; }
	static __always_inline bool has_vector(void) { return false; }
	static inline bool riscv_v_first_use_handler(struct pt_regs *regs) { return false; }
	static inline bool riscv_v_vstate_query(struct pt_regs *regs) { return false; }
	static inline bool riscv_v_vstate_ctrl_user_allowed(void) { return false; }
	#define riscv_v_vsize (0)
	#define riscv_v_vstate_discard(regs) do {} while (0)
	#define riscv_v_vstate_save(vstate, regs) do {} while (0)
	#define riscv_v_vstate_restore(vstate, regs) do {} while (0)
	#define __switch_to_vector(__prev, __next) do {} while (0)
	#define riscv_v_vstate_off(regs) do {} while (0)
	#define riscv_v_vstate_on(regs) do {} while (0)
	#define riscv_v_thread_free(tsk) do {} while (0)
	#define riscv_v_setup_ctx_cache() do {} while (0)
	#define riscv_v_thread_alloc(tsk) do {} while (0)

	#endif /* CONFIG_RISCV_ISA_V */

	/*
	* Return the implementation's vlen value.
	*
	* riscv_v_vsize contains the value of "32 vector registers with vlenb length"
	* so rebuild the vlen value in bits from it.
	*/
	static inline int riscv_vector_vlen(void)
	{
	return riscv_v_vsize / 32 * 8;
	}

	#endif /* ! __ASM_RISCV_VECTOR_H */