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riscv: Add task switch support for vector

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This patch adds task switch support for vector. It also supports all
lengths of vlen.

Suggested-by: Andrew Waterman <andrew@sifive.com>
Co-developed-by: Nick Knight <nick.knight@sifive.com>
Signed-off-by: Nick Knight <nick.knight@sifive.com>
Co-developed-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Co-developed-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Co-developed-by: Ruinland Tsai <ruinland.tsai@sifive.com>
Signed-off-by: Ruinland Tsai <ruinland.tsai@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Vineet Gupta <vineetg@rivosinc.com>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Link: https://lore.kernel.org/r/20230605110724.21391-11-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Greentime Hu
2023-06-05 11:07:07 +00:00
committed by Palmer Dabbelt
parent 03c3fcd994
commit 3a2df6323d
5 changed files with 64 additions and 0 deletions
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19
arch/riscv/kernel/process.c
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@@ -24,6 +24,7 @@
#include <asm/switch_to.h>
#include <asm/thread_info.h>
#include <asm/cpuidle.h>
#include <asm/vector.h>
register unsigned long gp_in_global __asm__("gp");
@@ -146,12 +147,28 @@ void flush_thread(void)
fstate_off(current, task_pt_regs(current));
memset(&current->thread.fstate, 0, sizeof(current->thread.fstate));
#endif
#ifdef CONFIG_RISCV_ISA_V
/* Reset vector state */
riscv_v_vstate_off(task_pt_regs(current));
kfree(current->thread.vstate.datap);
memset(&current->thread.vstate, 0, sizeof(struct __riscv_v_ext_state));
#endif
}
void arch_release_task_struct(struct task_struct *tsk)
{
/* Free the vector context of datap. */
if (has_vector())
kfree(tsk->thread.vstate.datap);
}
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
fstate_save(src, task_pt_regs(src));
*dst = *src;
/* clear entire V context, including datap for a new task */
memset(&dst->thread.vstate, 0, sizeof(struct __riscv_v_ext_state));
return 0;
}
@@ -176,6 +193,8 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
p->thread.s[1] = (unsigned long)args->fn_arg;
} else {
*childregs = *(current_pt_regs());
/* Turn off status.VS */
riscv_v_vstate_off(childregs);
if (usp) /* User fork */
childregs->sp = usp;
if (clone_flags & CLONE_SETTLS)