[v9, 07/10] riscv: vector: do not pass task_struct into riscv_v_vstate_{save,restore}()
Andy Chiu
andy.chiu at sifive.com
Fri Dec 29 06:36:24 PST 2023
riscv_v_vstate_{save,restore}() can operate only on the knowlege of
struct __riscv_v_ext_state, and struct pt_regs. Let the caller decides
which should be passed into the function. Meanwhile, the kernel-mode
Vector is going to introduce another vstate, so this also makes functions
potentially able to be reused.
Signed-off-by: Andy Chiu <andy.chiu at sifive.com>
Acked-by: Conor Dooley <conor.dooley at microchip.com>
---
Changelog v6:
- re-added for v6
Changelog v3:
- save V context after get_cpu_vector_context
Changelog v2:
- fix build fail that get caught on this patch (Conor)
---
arch/riscv/include/asm/entry-common.h | 2 +-
arch/riscv/include/asm/vector.h | 14 +++++---------
arch/riscv/kernel/kernel_mode_vector.c | 2 +-
arch/riscv/kernel/ptrace.c | 2 +-
arch/riscv/kernel/signal.c | 2 +-
5 files changed, 9 insertions(+), 13 deletions(-)
diff --git a/arch/riscv/include/asm/entry-common.h b/arch/riscv/include/asm/entry-common.h
index 19023c430a9b..2293e535f865 100644
--- a/arch/riscv/include/asm/entry-common.h
+++ b/arch/riscv/include/asm/entry-common.h
@@ -16,7 +16,7 @@ static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
* We are already called with irq disabled, so go without
* keeping track of riscv_v_flags.
*/
- riscv_v_vstate_restore(current, regs);
+ riscv_v_vstate_restore(¤t->thread.vstate, regs);
}
}
diff --git a/arch/riscv/include/asm/vector.h b/arch/riscv/include/asm/vector.h
index 961c4e3d1b62..d75079520629 100644
--- a/arch/riscv/include/asm/vector.h
+++ b/arch/riscv/include/asm/vector.h
@@ -171,23 +171,19 @@ static inline void riscv_v_vstate_discard(struct pt_regs *regs)
__riscv_v_vstate_dirty(regs);
}
-static inline void riscv_v_vstate_save(struct task_struct *task,
+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) {
- struct __riscv_v_ext_state *vstate = &task->thread.vstate;
-
__riscv_v_vstate_save(vstate, vstate->datap);
__riscv_v_vstate_clean(regs);
}
}
-static inline void riscv_v_vstate_restore(struct task_struct *task,
+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) {
- struct __riscv_v_ext_state *vstate = &task->thread.vstate;
-
__riscv_v_vstate_restore(vstate, vstate->datap);
__riscv_v_vstate_clean(regs);
}
@@ -208,7 +204,7 @@ static inline void __switch_to_vector(struct task_struct *prev,
struct pt_regs *regs;
regs = task_pt_regs(prev);
- riscv_v_vstate_save(prev, regs);
+ riscv_v_vstate_save(&prev->thread.vstate, regs);
riscv_v_vstate_set_restore(next, task_pt_regs(next));
}
@@ -226,8 +222,8 @@ 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(task, regs) do {} while (0)
-#define riscv_v_vstate_restore(task, 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)
diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_mode_vector.c
index 8422c881f452..241a8f834e1c 100644
--- a/arch/riscv/kernel/kernel_mode_vector.c
+++ b/arch/riscv/kernel/kernel_mode_vector.c
@@ -97,7 +97,7 @@ void kernel_vector_begin(void)
get_cpu_vector_context();
- riscv_v_vstate_save(current, task_pt_regs(current));
+ riscv_v_vstate_save(¤t->thread.vstate, task_pt_regs(current));
riscv_v_enable();
}
diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c
index 7b93bcbdf9fa..e8515aa9d80b 100644
--- a/arch/riscv/kernel/ptrace.c
+++ b/arch/riscv/kernel/ptrace.c
@@ -101,7 +101,7 @@ static int riscv_vr_get(struct task_struct *target,
*/
if (target == current) {
get_cpu_vector_context();
- riscv_v_vstate_save(current, task_pt_regs(current));
+ riscv_v_vstate_save(¤t->thread.vstate, task_pt_regs(current));
put_cpu_vector_context();
}
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index aca4a12c8416..5d69f4db9e8f 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -87,7 +87,7 @@ static long save_v_state(struct pt_regs *regs, void __user **sc_vec)
WARN_ON(unlikely(!IS_ALIGNED((unsigned long)datap, 16)));
get_cpu_vector_context();
- riscv_v_vstate_save(current, regs);
+ riscv_v_vstate_save(¤t->thread.vstate, regs);
put_cpu_vector_context();
/* Copy everything of vstate but datap. */
--
2.17.1
More information about the linux-riscv
mailing list