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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-11-19 11:30:49 (GMT)
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-11-19 11:30:49 (GMT)
commit2079f30e9e83887ca95fa129d0bc734b2c4b406d (patch)
tree91dbfd05c27d757e4e05a265308542bf54d8d3b7 /arch/arm/include
parentf27d9b7198a0a0ffbd872a4b795c7613cd759ea3 (diff)
parentbf51bb82ccd9a74e9702d06107b23e54b27a5707 (diff)
downloadlinux-fsl-qoriq-2079f30e9e83887ca95fa129d0bc734b2c4b406d.tar.xz
Merge branch 'asid-allocation' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into devel-stable
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/mmu.h11
-rw-r--r--arch/arm/include/asm/mmu_context.h82
2 files changed, 7 insertions, 86 deletions
diff --git a/arch/arm/include/asm/mmu.h b/arch/arm/include/asm/mmu.h
index 1496565..5b53b53 100644
--- a/arch/arm/include/asm/mmu.h
+++ b/arch/arm/include/asm/mmu.h
@@ -5,18 +5,15 @@
typedef struct {
#ifdef CONFIG_CPU_HAS_ASID
- unsigned int id;
- raw_spinlock_t id_lock;
+ u64 id;
#endif
unsigned int kvm_seq;
} mm_context_t;
#ifdef CONFIG_CPU_HAS_ASID
-#define ASID(mm) ((mm)->context.id & 255)
-
-/* init_mm.context.id_lock should be initialized. */
-#define INIT_MM_CONTEXT(name) \
- .context.id_lock = __RAW_SPIN_LOCK_UNLOCKED(name.context.id_lock),
+#define ASID_BITS 8
+#define ASID_MASK ((~0ULL) << ASID_BITS)
+#define ASID(mm) ((mm)->context.id & ~ASID_MASK)
#else
#define ASID(mm) (0)
#endif
diff --git a/arch/arm/include/asm/mmu_context.h b/arch/arm/include/asm/mmu_context.h
index 0306bc6..a64f61c 100644
--- a/arch/arm/include/asm/mmu_context.h
+++ b/arch/arm/include/asm/mmu_context.h
@@ -24,84 +24,8 @@ void __check_kvm_seq(struct mm_struct *mm);
#ifdef CONFIG_CPU_HAS_ASID
-/*
- * On ARMv6, we have the following structure in the Context ID:
- *
- * 31 7 0
- * +-------------------------+-----------+
- * | process ID | ASID |
- * +-------------------------+-----------+
- * | context ID |
- * +-------------------------------------+
- *
- * The ASID is used to tag entries in the CPU caches and TLBs.
- * The context ID is used by debuggers and trace logic, and
- * should be unique within all running processes.
- */
-#define ASID_BITS 8
-#define ASID_MASK ((~0) << ASID_BITS)
-#define ASID_FIRST_VERSION (1 << ASID_BITS)
-
-extern unsigned int cpu_last_asid;
-
-void __init_new_context(struct task_struct *tsk, struct mm_struct *mm);
-void __new_context(struct mm_struct *mm);
-void cpu_set_reserved_ttbr0(void);
-
-static inline void switch_new_context(struct mm_struct *mm)
-{
- unsigned long flags;
-
- __new_context(mm);
-
- local_irq_save(flags);
- cpu_switch_mm(mm->pgd, mm);
- local_irq_restore(flags);
-}
-
-static inline void check_and_switch_context(struct mm_struct *mm,
- struct task_struct *tsk)
-{
- if (unlikely(mm->context.kvm_seq != init_mm.context.kvm_seq))
- __check_kvm_seq(mm);
-
- /*
- * Required during context switch to avoid speculative page table
- * walking with the wrong TTBR.
- */
- cpu_set_reserved_ttbr0();
-
- if (!((mm->context.id ^ cpu_last_asid) >> ASID_BITS))
- /*
- * The ASID is from the current generation, just switch to the
- * new pgd. This condition is only true for calls from
- * context_switch() and interrupts are already disabled.
- */
- cpu_switch_mm(mm->pgd, mm);
- else if (irqs_disabled())
- /*
- * Defer the new ASID allocation until after the context
- * switch critical region since __new_context() cannot be
- * called with interrupts disabled (it sends IPIs).
- */
- set_ti_thread_flag(task_thread_info(tsk), TIF_SWITCH_MM);
- else
- /*
- * That is a direct call to switch_mm() or activate_mm() with
- * interrupts enabled and a new context.
- */
- switch_new_context(mm);
-}
-
-#define init_new_context(tsk,mm) (__init_new_context(tsk,mm),0)
-
-#define finish_arch_post_lock_switch \
- finish_arch_post_lock_switch
-static inline void finish_arch_post_lock_switch(void)
-{
- if (test_and_clear_thread_flag(TIF_SWITCH_MM))
- switch_new_context(current->mm);
-}
+void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk);
+#define init_new_context(tsk,mm) ({ mm->context.id = 0; })
#else /* !CONFIG_CPU_HAS_ASID */
@@ -143,6 +67,7 @@ static inline void finish_arch_post_lock_switch(void)
#endif /* CONFIG_CPU_HAS_ASID */
#define destroy_context(mm) do { } while(0)
+#define activate_mm(prev,next) switch_mm(prev, next, NULL)
/*
* This is called when "tsk" is about to enter lazy TLB mode.
@@ -186,6 +111,5 @@ switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
#define deactivate_mm(tsk,mm) do { } while (0)
-#define activate_mm(prev,next) switch_mm(prev, next, NULL)
#endif