[PATCH v2 5/8] powerpc/entry: add irqentry_state and generic entry support
Luming Yu
luming.yu at shingroup.cn
Mon Nov 11 14:19:34 AEDT 2024
generic irq entry support via generic irqentry is added for powerpc.
There may be duplciate calls and missing callbacks requires further
work.
Signed-off-by: Luming Yu <luming.yu at shingroup.cn>
---
arch/powerpc/include/asm/entry-common.h | 32 ++++++++++++++++
arch/powerpc/kernel/interrupt.c | 51 +++++--------------------
arch/powerpc/kernel/signal.c | 7 ++++
arch/powerpc/kernel/syscall.c | 2 -
4 files changed, 49 insertions(+), 43 deletions(-)
diff --git a/arch/powerpc/include/asm/entry-common.h b/arch/powerpc/include/asm/entry-common.h
index 51f1eb767696..faa829e15b5d 100644
--- a/arch/powerpc/include/asm/entry-common.h
+++ b/arch/powerpc/include/asm/entry-common.h
@@ -3,6 +3,7 @@
#define ARCH_POWERPC_ENTRY_COMMON_H
#include <linux/user-return-notifier.h>
+#include <asm/switch_to.h>
static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
unsigned long ti_work)
@@ -13,4 +14,35 @@ static inline void arch_exit_to_user_mode_prepare(struct pt_regs *regs,
#define arch_exit_to_user_mode_prepare arch_exit_to_user_mode_prepare
+static inline void arch_exit_to_user_mode_work(struct pt_regs *regs,
+ unsigned long ti_work)
+{
+
+ if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && IS_ENABLED(CONFIG_PPC_FPU)) {
+ if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) &&
+ unlikely((ti_work & _TIF_RESTORE_TM))) {
+ restore_tm_state(regs);
+ } else {
+ unsigned long mathflags = MSR_FP;
+
+ if (cpu_has_feature(CPU_FTR_VSX))
+ mathflags |= MSR_VEC | MSR_VSX;
+ else if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ mathflags |= MSR_VEC;
+
+ /*
+ * If userspace MSR has all available FP bits set,
+ * then they are live and no need to restore. If not,
+ * it means the regs were given up and restore_math
+ * may decide to restore them (to avoid taking an FP
+ * fault).
+ */
+ if ((regs->msr & mathflags) != mathflags)
+ restore_math(regs);
+ }
+ }
+}
+
+#define arch_exit_to_user_mode_work arch_exit_to_user_mode_work
+
#endif
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 609ba48034de..42af9217136d 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -3,6 +3,7 @@
#include <linux/context_tracking.h>
#include <linux/err.h>
#include <linux/compat.h>
+#include <linux/entry-common.h>
#include <linux/sched/debug.h> /* for show_regs */
#include <asm/kup.h>
@@ -183,47 +184,11 @@ interrupt_exit_user_prepare_main(unsigned long ret, struct pt_regs *regs)
again:
ti_flags = read_thread_flags();
- while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) {
- local_irq_enable();
- if (ti_flags & _TIF_NEED_RESCHED) {
- schedule();
- } else {
- /*
- * SIGPENDING must restore signal handler function
- * argument GPRs, and some non-volatiles (e.g., r1).
- * Restore all for now. This could be made lighter.
- */
- if (ti_flags & _TIF_SIGPENDING)
- ret |= _TIF_RESTOREALL;
- do_notify_resume(regs, ti_flags);
- }
- local_irq_disable();
- ti_flags = read_thread_flags();
- }
- if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && IS_ENABLED(CONFIG_PPC_FPU)) {
- if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) &&
- unlikely((ti_flags & _TIF_RESTORE_TM))) {
- restore_tm_state(regs);
- } else {
- unsigned long mathflags = MSR_FP;
-
- if (cpu_has_feature(CPU_FTR_VSX))
- mathflags |= MSR_VEC | MSR_VSX;
- else if (cpu_has_feature(CPU_FTR_ALTIVEC))
- mathflags |= MSR_VEC;
-
- /*
- * If userspace MSR has all available FP bits set,
- * then they are live and no need to restore. If not,
- * it means the regs were given up and restore_math
- * may decide to restore them (to avoid taking an FP
- * fault).
- */
- if ((regs->msr & mathflags) != mathflags)
- restore_math(regs);
- }
- }
+ if (ti_flags & _TIF_SIGPENDING)
+ ret |= _TIF_RESTOREALL;
+ if (unlikely(ti_flags & EXIT_TO_USER_MODE_WORK))
+ ti_flags = exit_to_user_mode_loop(regs, ti_flags);
check_return_regs_valid(regs);
@@ -297,11 +262,15 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
}
local_irq_disable();
- ret = interrupt_exit_user_prepare_main(ret, regs);
+ if (ti_flags & _TIF_RESTOREALL)
+ ret |= _TIF_RESTOREALL;
+ if (ti_flags & _TIF_SIGPENDING)
+ ret |= _TIF_RESTOREALL;
#ifdef CONFIG_PPC64
regs->exit_result = ret;
#endif
+ syscall_exit_to_user_mode(regs);
return ret;
}
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index aa17e62f3754..da21e7fef46a 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -11,6 +11,7 @@
#include <linux/uprobes.h>
#include <linux/key.h>
#include <linux/context_tracking.h>
+#include <linux/entry-common.h>
#include <linux/livepatch.h>
#include <linux/syscalls.h>
#include <asm/hw_breakpoint.h>
@@ -368,3 +369,9 @@ void signal_fault(struct task_struct *tsk, struct pt_regs *regs,
printk_ratelimited(regs->msr & MSR_64BIT ? fm64 : fm32, tsk->comm,
task_pid_nr(tsk), where, ptr, regs->nip, regs->link);
}
+
+void arch_do_signal_or_restart(struct pt_regs *regs)
+{
+ BUG_ON(regs != current->thread.regs);
+ do_signal(current);
+}
diff --git a/arch/powerpc/kernel/syscall.c b/arch/powerpc/kernel/syscall.c
index e0338bd8d383..97f158d13944 100644
--- a/arch/powerpc/kernel/syscall.c
+++ b/arch/powerpc/kernel/syscall.c
@@ -185,8 +185,6 @@ notrace long system_call_exception(struct pt_regs *regs, unsigned long r0)
* So the resulting 6 or 7 bits of entropy is seen in SP[9:4] or SP[9:3].
*/
choose_random_kstack_offset(mftb());
- /*common entry*/
- syscall_exit_to_user_mode(regs);
return ret;
}
--
2.42.0.windows.2
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