#include <linux/mm.h>
#include <asm/processor.h>
+#include <asm/pgalloc.h>
/*
- * TLB flushing:
- *
- * - flush_tlb() flushes the current mm struct TLBs
- * - flush_tlb_all() flushes all processes TLBs
- * - flush_tlb_mm(mm) flushes the specified mm context TLB's
- * - flush_tlb_page(vma, vmaddr) flushes one page
- * - flush_tlb_range(vma, start, end) flushes a range of pages
- * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
- * - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
- */
-
-/*
- * S/390 has three ways of flushing TLBs
- * 'ptlb' does a flush of the local processor
- * 'csp' flushes the TLBs on all PUs of a SMP
- * 'ipte' invalidates a pte in a page table and flushes that out of
- * the TLBs of all PUs of a SMP
+ * Flush all tlb entries on the local cpu.
*/
-
-#define local_flush_tlb() \
-do { __asm__ __volatile__("ptlb": : :"memory"); } while (0)
-
-#ifndef CONFIG_SMP
+static inline void __tlb_flush_local(void)
+{
+ asm volatile("ptlb" : : : "memory");
+}
/*
- * We always need to flush, since s390 does not flush tlb
- * on each context switch
+ * Flush all tlb entries on all cpus.
*/
-
-static inline void flush_tlb(void)
+static inline void __tlb_flush_global(void)
{
- local_flush_tlb();
-}
-static inline void flush_tlb_all(void)
-{
- local_flush_tlb();
-}
-static inline void flush_tlb_mm(struct mm_struct *mm)
-{
- local_flush_tlb();
-}
-static inline void flush_tlb_page(struct vm_area_struct *vma,
- unsigned long addr)
-{
- local_flush_tlb();
-}
-static inline void flush_tlb_range(struct vm_area_struct *vma,
- unsigned long start, unsigned long end)
-{
- local_flush_tlb();
-}
-
-#define flush_tlb_kernel_range(start, end) \
- local_flush_tlb();
-
-#else
-
-#include <asm/smp.h>
+ extern void smp_ptlb_all(void);
+ register unsigned long reg2 asm("2");
+ register unsigned long reg3 asm("3");
+ register unsigned long reg4 asm("4");
+ long dummy;
-extern void smp_ptlb_all(void);
-
-static inline void global_flush_tlb(void)
-{
#ifndef __s390x__
if (!MACHINE_HAS_CSP) {
smp_ptlb_all();
return;
}
#endif /* __s390x__ */
- {
- register unsigned long addr asm("4");
- long dummy;
-
- dummy = 0;
- addr = ((unsigned long) &dummy) + 1;
- __asm__ __volatile__ (
- " slr 2,2\n"
- " slr 3,3\n"
- " csp 2,%0"
- : : "a" (addr), "m" (dummy) : "cc", "2", "3" );
- }
+
+ dummy = 0;
+ reg2 = reg3 = 0;
+ reg4 = ((unsigned long) &dummy) + 1;
+ asm volatile(
+ " csp %0,%2"
+ : : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
}
/*
- * We only have to do global flush of tlb if process run since last
- * flush on any other pu than current.
- * If we have threads (mm->count > 1) we always do a global flush,
- * since the process runs on more than one processor at the same time.
+ * Flush all tlb entries of a page table on all cpus.
*/
+static inline void __tlb_flush_idte(unsigned long asce)
+{
+ asm volatile(
+ " .insn rrf,0xb98e0000,0,%0,%1,0"
+ : : "a" (2048), "a" (asce) : "cc" );
+}
-static inline void __flush_tlb_mm(struct mm_struct * mm)
+static inline void __tlb_flush_mm(struct mm_struct * mm)
{
cpumask_t local_cpumask;
if (unlikely(cpus_empty(mm->cpu_vm_mask)))
return;
+ /*
+ * If the machine has IDTE we prefer to do a per mm flush
+ * on all cpus instead of doing a local flush if the mm
+ * only ran on the local cpu.
+ */
if (MACHINE_HAS_IDTE) {
- asm volatile (".insn rrf,0xb98e0000,0,%0,%1,0"
- : : "a" (2048),
- "a" (__pa(mm->pgd)&PAGE_MASK) : "cc" );
+ pgd_t *shadow = get_shadow_table(mm->pgd);
+
+ if (shadow)
+ __tlb_flush_idte((unsigned long) shadow | mm->context);
+ __tlb_flush_idte((unsigned long) mm->pgd | mm->context);
return;
}
preempt_disable();
+ /*
+ * If the process only ran on the local cpu, do a local flush.
+ */
local_cpumask = cpumask_of_cpu(smp_processor_id());
if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
- local_flush_tlb();
+ __tlb_flush_local();
else
- global_flush_tlb();
+ __tlb_flush_global();
preempt_enable();
}
-static inline void flush_tlb(void)
-{
- __flush_tlb_mm(current->mm);
-}
-static inline void flush_tlb_all(void)
-{
- global_flush_tlb();
-}
-static inline void flush_tlb_mm(struct mm_struct *mm)
+static inline void __tlb_flush_mm_cond(struct mm_struct * mm)
{
- __flush_tlb_mm(mm);
+ if (atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm)
+ __tlb_flush_mm(mm);
}
-static inline void flush_tlb_page(struct vm_area_struct *vma,
- unsigned long addr)
+
+/*
+ * TLB flushing:
+ * flush_tlb() - flushes the current mm struct TLBs
+ * flush_tlb_all() - flushes all processes TLBs
+ * flush_tlb_mm(mm) - flushes the specified mm context TLB's
+ * flush_tlb_page(vma, vmaddr) - flushes one page
+ * flush_tlb_range(vma, start, end) - flushes a range of pages
+ * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages
+ */
+
+/*
+ * flush_tlb_mm goes together with ptep_set_wrprotect for the
+ * copy_page_range operation and flush_tlb_range is related to
+ * ptep_get_and_clear for change_protection. ptep_set_wrprotect and
+ * ptep_get_and_clear do not flush the TLBs directly if the mm has
+ * only one user. At the end of the update the flush_tlb_mm and
+ * flush_tlb_range functions need to do the flush.
+ */
+#define flush_tlb() do { } while (0)
+#define flush_tlb_all() do { } while (0)
+#define flush_tlb_page(vma, addr) do { } while (0)
+
+static inline void flush_tlb_mm(struct mm_struct *mm)
{
- __flush_tlb_mm(vma->vm_mm);
+ __tlb_flush_mm_cond(mm);
}
+
static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
- __flush_tlb_mm(vma->vm_mm);
+ __tlb_flush_mm_cond(vma->vm_mm);
}
-#define flush_tlb_kernel_range(start, end) global_flush_tlb()
-
-#endif
-
-static inline void flush_tlb_pgtables(struct mm_struct *mm,
- unsigned long start, unsigned long end)
+static inline void flush_tlb_kernel_range(unsigned long start,
+ unsigned long end)
{
- /* S/390 does not keep any page table caches in TLB */
+ __tlb_flush_mm(&init_mm);
}
#endif /* _S390_TLBFLUSH_H */
projects / linux-2.6-omap-h63xx.git / blobdiff