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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2014-04-03 13:55:01 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-04-03 14:31:00 +0200
commit1b948d6caec4f28e3524244ca0f77c6ae8ddceef (patch)
treebc7e1d5800f10c39979d3f47872ba7047568f8a4 /arch/s390/mm
parent02a8f3abb708919149cb657a5202f4603f0c38e2 (diff)
downloadop-kernel-dev-1b948d6caec4f28e3524244ca0f77c6ae8ddceef.zip
op-kernel-dev-1b948d6caec4f28e3524244ca0f77c6ae8ddceef.tar.gz
s390/mm,tlb: optimize TLB flushing for zEC12
The zEC12 machines introduced the local-clearing control for the IDTE and IPTE instruction. If the control is set only the TLB of the local CPU is cleared of entries, either all entries of a single address space for IDTE, or the entry for a single page-table entry for IPTE. Without the local-clearing control the TLB flush is broadcasted to all CPUs in the configuration, which is expensive. The reset of the bit mask of the CPUs that need flushing after a non-local IDTE is tricky. As TLB entries for an address space remain in the TLB even if the address space is detached a new bit field is required to keep track of attached CPUs vs. CPUs in the need of a flush. After a non-local flush with IDTE the bit-field of attached CPUs is copied to the bit-field of CPUs in need of a flush. The ordering of operations on cpu_attach_mask, attach_count and mm_cpumask(mm) is such that an underindication in mm_cpumask(mm) is prevented but an overindication in mm_cpumask(mm) is possible. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/hugetlbpage.c5
-rw-r--r--arch/s390/mm/init.c7
-rw-r--r--arch/s390/mm/pgtable.c4
-rw-r--r--arch/s390/mm/vmem.c2
4 files changed, 8 insertions, 10 deletions
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index d261c62..0727a55d 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -123,10 +123,7 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
pmd_t *pmdp = (pmd_t *) ptep;
pte_t pte = huge_ptep_get(ptep);
- if (MACHINE_HAS_IDTE)
- __pmd_idte(addr, pmdp);
- else
- __pmd_csp(pmdp);
+ pmdp_flush_direct(mm, addr, pmdp);
pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY;
return pte;
}
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index ad446b0..0c1073e 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -124,8 +124,6 @@ void __init paging_init(void)
__ctl_load(S390_lowcore.kernel_asce, 13, 13);
arch_local_irq_restore(4UL << (BITS_PER_LONG - 8));
- atomic_set(&init_mm.context.attach_count, 1);
-
sparse_memory_present_with_active_regions(MAX_NUMNODES);
sparse_init();
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
@@ -136,6 +134,11 @@ void __init paging_init(void)
void __init mem_init(void)
{
+ if (MACHINE_HAS_TLB_LC)
+ cpumask_set_cpu(0, &init_mm.context.cpu_attach_mask);
+ cpumask_set_cpu(0, mm_cpumask(&init_mm));
+ atomic_set(&init_mm.context.attach_count, 1);
+
max_mapnr = max_low_pfn;
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 24c6290..c57c633 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -200,7 +200,7 @@ static int gmap_unlink_segment(struct gmap *gmap, unsigned long *table)
static void gmap_flush_tlb(struct gmap *gmap)
{
if (MACHINE_HAS_IDTE)
- __tlb_flush_idte((unsigned long) gmap->table |
+ __tlb_flush_asce(gmap->mm, (unsigned long) gmap->table |
_ASCE_TYPE_REGION1);
else
__tlb_flush_global();
@@ -219,7 +219,7 @@ void gmap_free(struct gmap *gmap)
/* Flush tlb. */
if (MACHINE_HAS_IDTE)
- __tlb_flush_idte((unsigned long) gmap->table |
+ __tlb_flush_asce(gmap->mm, (unsigned long) gmap->table |
_ASCE_TYPE_REGION1);
else
__tlb_flush_global();
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index bcfb70b..72b04de 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -138,7 +138,6 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro)
}
ret = 0;
out:
- flush_tlb_kernel_range(start, end);
return ret;
}
@@ -265,7 +264,6 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
memset((void *)start, 0, end - start);
ret = 0;
out:
- flush_tlb_kernel_range(start, end);
return ret;
}
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