diff options
Diffstat (limited to 'arch/s390/mm/vmem.c')
| -rw-r--r-- | arch/s390/mm/vmem.c | 61 |
1 files changed, 49 insertions, 12 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 387c7c60b5b8..ffab84db6907 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -85,7 +85,6 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro) pud_t *pu_dir; pmd_t *pm_dir; pte_t *pt_dir; - pte_t pte; int ret = -ENOMEM; while (address < end) { @@ -96,23 +95,30 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro) goto out; pgd_populate(&init_mm, pg_dir, pu_dir); } - pu_dir = pud_offset(pg_dir, address); +#if defined(CONFIG_64BIT) && !defined(CONFIG_DEBUG_PAGEALLOC) + if (MACHINE_HAS_EDAT2 && pud_none(*pu_dir) && address && + !(address & ~PUD_MASK) && (address + PUD_SIZE <= end)) { + pud_val(*pu_dir) = __pa(address) | + _REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE | + (ro ? _REGION_ENTRY_RO : 0); + address += PUD_SIZE; + continue; + } +#endif if (pud_none(*pu_dir)) { pm_dir = vmem_pmd_alloc(); if (!pm_dir) goto out; pud_populate(&init_mm, pu_dir, pm_dir); } - - pte = mk_pte_phys(address, __pgprot(ro ? _PAGE_RO : 0)); pm_dir = pmd_offset(pu_dir, address); - #if defined(CONFIG_64BIT) && !defined(CONFIG_DEBUG_PAGEALLOC) if (MACHINE_HAS_EDAT1 && pmd_none(*pm_dir) && address && !(address & ~PMD_MASK) && (address + PMD_SIZE <= end)) { - pte_val(pte) |= _SEGMENT_ENTRY_LARGE; - pmd_val(*pm_dir) = pte_val(pte); + pmd_val(*pm_dir) = __pa(address) | + _SEGMENT_ENTRY | _SEGMENT_ENTRY_LARGE | + (ro ? _SEGMENT_ENTRY_RO : 0); address += PMD_SIZE; continue; } @@ -125,7 +131,7 @@ static int vmem_add_mem(unsigned long start, unsigned long size, int ro) } pt_dir = pte_offset_kernel(pm_dir, address); - *pt_dir = pte; + pte_val(*pt_dir) = __pa(address) | (ro ? _PAGE_RO : 0); address += PAGE_SIZE; } ret = 0; @@ -160,6 +166,11 @@ static void vmem_remove_range(unsigned long start, unsigned long size) address += PUD_SIZE; continue; } + if (pud_large(*pu_dir)) { + pud_clear(pu_dir); + address += PUD_SIZE; + continue; + } pm_dir = pmd_offset(pu_dir, address); if (pmd_none(*pm_dir)) { address += PMD_SIZE; @@ -187,13 +198,12 @@ int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node) pud_t *pu_dir; pmd_t *pm_dir; pte_t *pt_dir; - pte_t pte; int ret = -ENOMEM; start_addr = (unsigned long) start; end_addr = (unsigned long) (start + nr); - for (address = start_addr; address < end_addr; address += PAGE_SIZE) { + for (address = start_addr; address < end_addr;) { pg_dir = pgd_offset_k(address); if (pgd_none(*pg_dir)) { pu_dir = vmem_pud_alloc(); @@ -212,10 +222,33 @@ int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node) pm_dir = pmd_offset(pu_dir, address); if (pmd_none(*pm_dir)) { +#ifdef CONFIG_64BIT + /* Use 1MB frames for vmemmap if available. We always + * use large frames even if they are only partially + * used. + * Otherwise we would have also page tables since + * vmemmap_populate gets called for each section + * separately. */ + if (MACHINE_HAS_EDAT1) { + void *new_page; + + new_page = vmemmap_alloc_block(PMD_SIZE, node); + if (!new_page) + goto out; + pmd_val(*pm_dir) = __pa(new_page) | + _SEGMENT_ENTRY | _SEGMENT_ENTRY_LARGE | + _SEGMENT_ENTRY_CO; + address = (address + PMD_SIZE) & PMD_MASK; + continue; + } +#endif pt_dir = vmem_pte_alloc(address); if (!pt_dir) goto out; pmd_populate(&init_mm, pm_dir, pt_dir); + } else if (pmd_large(*pm_dir)) { + address = (address + PMD_SIZE) & PMD_MASK; + continue; } pt_dir = pte_offset_kernel(pm_dir, address); @@ -225,9 +258,9 @@ int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node) new_page =__pa(vmem_alloc_pages(0)); if (!new_page) goto out; - pte = pfn_pte(new_page >> PAGE_SHIFT, PAGE_KERNEL); - *pt_dir = pte; + pte_val(*pt_dir) = __pa(new_page); } + address += PAGE_SIZE; } memset(start, 0, nr * sizeof(struct page)); ret = 0; @@ -236,6 +269,10 @@ out: return ret; } +void vmemmap_free(struct page *memmap, unsigned long nr_pages) +{ +} + /* * Add memory segment to the segment list if it doesn't overlap with * an already present segment. |