Commit 89b36d4f authored by Vincenzo Frascino's avatar Vincenzo Frascino
Browse files

arm64: mte: Report async tag faults before suspend

When MTE async mode is enabled TFSR_EL1 contains the accumulative
asynchronous tag check faults for EL1 and EL0.

During the suspend/resume operations the firmware might perform some
operations that could change the state of the register resulting in
a spurious tag check fault report.

Report asynchronous tag faults before suspend and clear the TFSR_EL1
register after resume to prevent this to happen.

Cc: Catalin Marinas <>
Cc: Will Deacon <>
Cc: Lorenzo Pieralisi <>
Reviewed-by: Catalin Marinas's avatarCatalin Marinas <>
Reviewed-by: Lorenzo Pieralisi's avatarLorenzo Pieralisi <>
Acked-by: default avatarAndrey Konovalov <>
Tested-by: default avatarAndrey Konovalov <>
Signed-off-by: Vincenzo Frascino's avatarVincenzo Frascino <>
parent e5cafaf9
......@@ -41,6 +41,7 @@ void mte_sync_tags(pte_t *ptep, pte_t pte);
void mte_copy_page_tags(void *kto, const void *kfrom);
void flush_mte_state(void);
void mte_thread_switch(struct task_struct *next);
void mte_suspend_enter(void);
void mte_suspend_exit(void);
long set_mte_ctrl(struct task_struct *task, unsigned long arg);
long get_mte_ctrl(struct task_struct *task);
......@@ -66,6 +67,9 @@ static inline void flush_mte_state(void)
static inline void mte_thread_switch(struct task_struct *next)
static inline void mte_suspend_enter(void)
static inline void mte_suspend_exit(void)
......@@ -265,6 +265,22 @@ void mte_thread_switch(struct task_struct *next)
void mte_suspend_enter(void)
if (!system_supports_mte())
* The barriers are required to guarantee that the indirect writes
* to TFSR_EL1 are synchronized before we report the state.
/* Report SYS_TFSR_EL1 before suspend entry */
void mte_suspend_exit(void)
if (!system_supports_mte())
......@@ -91,6 +91,9 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
unsigned long flags;
struct sleep_stack_data state;
/* Report any MTE async fault before going to suspend */
* From this point debug exceptions are disabled to prevent
* updates to mdscr register (saved and restored along with
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