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-rw-r--r--arch/s390/mm/fault.c2
-rw-r--r--arch/s390/mm/gup.c10
-rw-r--r--arch/s390/mm/init.c40
-rw-r--r--arch/s390/mm/pgtable.c225
4 files changed, 120 insertions, 157 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 4c8f5d7f9c23..f985856a538b 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -646,7 +646,7 @@ static void pfault_interrupt(struct ext_code ext_code,
return;
inc_irq_stat(IRQEXT_PFL);
/* Get the token (= pid of the affected task). */
- pid = sizeof(void *) == 4 ? param32 : param64;
+ pid = param64;
rcu_read_lock();
tsk = find_task_by_pid_ns(pid, &init_pid_ns);
if (tsk)
diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 1eb41bb3010c..12bbf0e8478f 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -30,6 +30,9 @@ static inline int gup_pte_range(pmd_t *pmdp, pmd_t pmd, unsigned long addr,
do {
pte = *ptep;
barrier();
+ /* Similar to the PMD case, NUMA hinting must take slow path */
+ if (pte_protnone(pte))
+ return 0;
if ((pte_val(pte) & mask) != 0)
return 0;
VM_BUG_ON(!pfn_valid(pte_pfn(pte)));
@@ -125,6 +128,13 @@ static inline int gup_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr,
if (pmd_none(pmd) || pmd_trans_splitting(pmd))
return 0;
if (unlikely(pmd_large(pmd))) {
+ /*
+ * NUMA hinting faults need to be handled in the GUP
+ * slowpath for accounting purposes and so that they
+ * can be serialised against THP migration.
+ */
+ if (pmd_protnone(pmd))
+ return 0;
if (!gup_huge_pmd(pmdp, pmd, addr, next,
write, pages, nr))
return 0;
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 76e873748b56..2963b563621c 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -27,6 +27,7 @@
#include <linux/initrd.h>
#include <linux/export.h>
#include <linux/gfp.h>
+#include <linux/memblock.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
@@ -138,7 +139,7 @@ void __init mem_init(void)
cpumask_set_cpu(0, mm_cpumask(&init_mm));
atomic_set(&init_mm.context.attach_count, 1);
- max_mapnr = max_low_pfn;
+ set_max_mapnr(max_low_pfn);
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
/* Setup guest page hinting */
@@ -170,37 +171,36 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size)
{
- unsigned long zone_start_pfn, zone_end_pfn, nr_pages;
+ unsigned long normal_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
+ unsigned long dma_end_pfn = PFN_DOWN(MAX_DMA_ADDRESS);
unsigned long start_pfn = PFN_DOWN(start);
unsigned long size_pages = PFN_DOWN(size);
- struct zone *zone;
- int rc;
+ unsigned long nr_pages;
+ int rc, zone_enum;
rc = vmem_add_mapping(start, size);
if (rc)
return rc;
- for_each_zone(zone) {
- if (zone_idx(zone) != ZONE_MOVABLE) {
- /* Add range within existing zone limits */
- zone_start_pfn = zone->zone_start_pfn;
- zone_end_pfn = zone->zone_start_pfn +
- zone->spanned_pages;
+
+ while (size_pages > 0) {
+ if (start_pfn < dma_end_pfn) {
+ nr_pages = (start_pfn + size_pages > dma_end_pfn) ?
+ dma_end_pfn - start_pfn : size_pages;
+ zone_enum = ZONE_DMA;
+ } else if (start_pfn < normal_end_pfn) {
+ nr_pages = (start_pfn + size_pages > normal_end_pfn) ?
+ normal_end_pfn - start_pfn : size_pages;
+ zone_enum = ZONE_NORMAL;
} else {
- /* Add remaining range to ZONE_MOVABLE */
- zone_start_pfn = start_pfn;
- zone_end_pfn = start_pfn + size_pages;
+ nr_pages = size_pages;
+ zone_enum = ZONE_MOVABLE;
}
- if (start_pfn < zone_start_pfn || start_pfn >= zone_end_pfn)
- continue;
- nr_pages = (start_pfn + size_pages > zone_end_pfn) ?
- zone_end_pfn - start_pfn : size_pages;
- rc = __add_pages(nid, zone, start_pfn, nr_pages);
+ rc = __add_pages(nid, NODE_DATA(nid)->node_zones + zone_enum,
+ start_pfn, size_pages);
if (rc)
break;
start_pfn += nr_pages;
size_pages -= nr_pages;
- if (!size_pages)
- break;
}
if (rc)
vmem_remove_mapping(start, size);
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index b33f66110ca9..54ef3bc01b43 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -10,11 +10,7 @@
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
-#include <linux/highmem.h>
-#include <linux/pagemap.h>
#include <linux/spinlock.h>
-#include <linux/module.h>
-#include <linux/quicklist.h>
#include <linux/rcupdate.h>
#include <linux/slab.h>
#include <linux/swapops.h>
@@ -28,12 +24,9 @@
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
-#define ALLOC_ORDER 2
-#define FRAG_MASK 0x03
-
unsigned long *crst_table_alloc(struct mm_struct *mm)
{
- struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
+ struct page *page = alloc_pages(GFP_KERNEL, 2);
if (!page)
return NULL;
@@ -42,7 +35,7 @@ unsigned long *crst_table_alloc(struct mm_struct *mm)
void crst_table_free(struct mm_struct *mm, unsigned long *table)
{
- free_pages((unsigned long) table, ALLOC_ORDER);
+ free_pages((unsigned long) table, 2);
}
static void __crst_table_upgrade(void *arg)
@@ -176,7 +169,7 @@ struct gmap *gmap_alloc(struct mm_struct *mm, unsigned long limit)
INIT_RADIX_TREE(&gmap->host_to_guest, GFP_ATOMIC);
spin_lock_init(&gmap->guest_table_lock);
gmap->mm = mm;
- page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
+ page = alloc_pages(GFP_KERNEL, 2);
if (!page)
goto out_free;
page->index = 0;
@@ -247,7 +240,7 @@ void gmap_free(struct gmap *gmap)
/* Free all segment & region tables. */
list_for_each_entry_safe(page, next, &gmap->crst_list, lru)
- __free_pages(page, ALLOC_ORDER);
+ __free_pages(page, 2);
gmap_radix_tree_free(&gmap->guest_to_host);
gmap_radix_tree_free(&gmap->host_to_guest);
down_write(&gmap->mm->mmap_sem);
@@ -287,7 +280,7 @@ static int gmap_alloc_table(struct gmap *gmap, unsigned long *table,
unsigned long *new;
/* since we dont free the gmap table until gmap_free we can unlock */
- page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);
+ page = alloc_pages(GFP_KERNEL, 2);
if (!page)
return -ENOMEM;
new = (unsigned long *) page_to_phys(page);
@@ -302,7 +295,7 @@ static int gmap_alloc_table(struct gmap *gmap, unsigned long *table,
}
spin_unlock(&gmap->mm->page_table_lock);
if (page)
- __free_pages(page, ALLOC_ORDER);
+ __free_pages(page, 2);
return 0;
}
@@ -795,40 +788,6 @@ void gmap_do_ipte_notify(struct mm_struct *mm, unsigned long vmaddr, pte_t *pte)
}
EXPORT_SYMBOL_GPL(gmap_do_ipte_notify);
-static inline int page_table_with_pgste(struct page *page)
-{
- return atomic_read(&page->_mapcount) == 0;
-}
-
-static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm)
-{
- struct page *page;
- unsigned long *table;
-
- page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
- if (!page)
- return NULL;
- if (!pgtable_page_ctor(page)) {
- __free_page(page);
- return NULL;
- }
- atomic_set(&page->_mapcount, 0);
- table = (unsigned long *) page_to_phys(page);
- clear_table(table, _PAGE_INVALID, PAGE_SIZE/2);
- clear_table(table + PTRS_PER_PTE, 0, PAGE_SIZE/2);
- return table;
-}
-
-static inline void page_table_free_pgste(unsigned long *table)
-{
- struct page *page;
-
- page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
- pgtable_page_dtor(page);
- atomic_set(&page->_mapcount, -1);
- __free_page(page);
-}
-
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned long key, bool nq)
{
@@ -957,20 +916,6 @@ __initcall(page_table_register_sysctl);
#else /* CONFIG_PGSTE */
-static inline int page_table_with_pgste(struct page *page)
-{
- return 0;
-}
-
-static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm)
-{
- return NULL;
-}
-
-static inline void page_table_free_pgste(unsigned long *table)
-{
-}
-
static inline void gmap_unlink(struct mm_struct *mm, unsigned long *table,
unsigned long vmaddr)
{
@@ -994,44 +939,55 @@ static inline unsigned int atomic_xor_bits(atomic_t *v, unsigned int bits)
*/
unsigned long *page_table_alloc(struct mm_struct *mm)
{
- unsigned long *uninitialized_var(table);
- struct page *uninitialized_var(page);
+ unsigned long *table;
+ struct page *page;
unsigned int mask, bit;
- if (mm_alloc_pgste(mm))
- return page_table_alloc_pgste(mm);
- /* Allocate fragments of a 4K page as 1K/2K page table */
- spin_lock_bh(&mm->context.list_lock);
- mask = FRAG_MASK;
- if (!list_empty(&mm->context.pgtable_list)) {
- page = list_first_entry(&mm->context.pgtable_list,
- struct page, lru);
- table = (unsigned long *) page_to_phys(page);
- mask = atomic_read(&page->_mapcount);
- mask = mask | (mask >> 4);
- }
- if ((mask & FRAG_MASK) == FRAG_MASK) {
- spin_unlock_bh(&mm->context.list_lock);
- page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
- if (!page)
- return NULL;
- if (!pgtable_page_ctor(page)) {
- __free_page(page);
- return NULL;
+ /* Try to get a fragment of a 4K page as a 2K page table */
+ if (!mm_alloc_pgste(mm)) {
+ table = NULL;
+ spin_lock_bh(&mm->context.list_lock);
+ if (!list_empty(&mm->context.pgtable_list)) {
+ page = list_first_entry(&mm->context.pgtable_list,
+ struct page, lru);
+ mask = atomic_read(&page->_mapcount);
+ mask = (mask | (mask >> 4)) & 3;
+ if (mask != 3) {
+ table = (unsigned long *) page_to_phys(page);
+ bit = mask & 1; /* =1 -> second 2K */
+ if (bit)
+ table += PTRS_PER_PTE;
+ atomic_xor_bits(&page->_mapcount, 1U << bit);
+ list_del(&page->lru);
+ }
}
+ spin_unlock_bh(&mm->context.list_lock);
+ if (table)
+ return table;
+ }
+ /* Allocate a fresh page */
+ page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
+ if (!page)
+ return NULL;
+ if (!pgtable_page_ctor(page)) {
+ __free_page(page);
+ return NULL;
+ }
+ /* Initialize page table */
+ table = (unsigned long *) page_to_phys(page);
+ if (mm_alloc_pgste(mm)) {
+ /* Return 4K page table with PGSTEs */
+ atomic_set(&page->_mapcount, 3);
+ clear_table(table, _PAGE_INVALID, PAGE_SIZE/2);
+ clear_table(table + PTRS_PER_PTE, 0, PAGE_SIZE/2);
+ } else {
+ /* Return the first 2K fragment of the page */
atomic_set(&page->_mapcount, 1);
- table = (unsigned long *) page_to_phys(page);
clear_table(table, _PAGE_INVALID, PAGE_SIZE);
spin_lock_bh(&mm->context.list_lock);
list_add(&page->lru, &mm->context.pgtable_list);
- } else {
- for (bit = 1; mask & bit; bit <<= 1)
- table += PTRS_PER_PTE;
- mask = atomic_xor_bits(&page->_mapcount, bit);
- if ((mask & FRAG_MASK) == FRAG_MASK)
- list_del(&page->lru);
+ spin_unlock_bh(&mm->context.list_lock);
}
- spin_unlock_bh(&mm->context.list_lock);
return table;
}
@@ -1041,37 +997,23 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
unsigned int bit, mask;
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
- if (page_table_with_pgste(page))
- return page_table_free_pgste(table);
- /* Free 1K/2K page table fragment of a 4K page */
- bit = 1 << ((__pa(table) & ~PAGE_MASK)/(PTRS_PER_PTE*sizeof(pte_t)));
- spin_lock_bh(&mm->context.list_lock);
- if ((atomic_read(&page->_mapcount) & FRAG_MASK) != FRAG_MASK)
- list_del(&page->lru);
- mask = atomic_xor_bits(&page->_mapcount, bit);
- if (mask & FRAG_MASK)
- list_add(&page->lru, &mm->context.pgtable_list);
- spin_unlock_bh(&mm->context.list_lock);
- if (mask == 0) {
- pgtable_page_dtor(page);
- atomic_set(&page->_mapcount, -1);
- __free_page(page);
+ if (!mm_alloc_pgste(mm)) {
+ /* Free 2K page table fragment of a 4K page */
+ bit = (__pa(table) & ~PAGE_MASK)/(PTRS_PER_PTE*sizeof(pte_t));
+ spin_lock_bh(&mm->context.list_lock);
+ mask = atomic_xor_bits(&page->_mapcount, 1U << bit);
+ if (mask & 3)
+ list_add(&page->lru, &mm->context.pgtable_list);
+ else
+ list_del(&page->lru);
+ spin_unlock_bh(&mm->context.list_lock);
+ if (mask != 0)
+ return;
}
-}
-
-static void __page_table_free_rcu(void *table, unsigned bit)
-{
- struct page *page;
- if (bit == FRAG_MASK)
- return page_table_free_pgste(table);
- /* Free 1K/2K page table fragment of a 4K page */
- page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
- if (atomic_xor_bits(&page->_mapcount, bit) == 0) {
- pgtable_page_dtor(page);
- atomic_set(&page->_mapcount, -1);
- __free_page(page);
- }
+ pgtable_page_dtor(page);
+ atomic_set(&page->_mapcount, -1);
+ __free_page(page);
}
void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table,
@@ -1083,34 +1025,45 @@ void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table,
mm = tlb->mm;
page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
- if (page_table_with_pgste(page)) {
+ if (mm_alloc_pgste(mm)) {
gmap_unlink(mm, table, vmaddr);
- table = (unsigned long *) (__pa(table) | FRAG_MASK);
+ table = (unsigned long *) (__pa(table) | 3);
tlb_remove_table(tlb, table);
return;
}
- bit = 1 << ((__pa(table) & ~PAGE_MASK) / (PTRS_PER_PTE*sizeof(pte_t)));
+ bit = (__pa(table) & ~PAGE_MASK) / (PTRS_PER_PTE*sizeof(pte_t));
spin_lock_bh(&mm->context.list_lock);
- if ((atomic_read(&page->_mapcount) & FRAG_MASK) != FRAG_MASK)
- list_del(&page->lru);
- mask = atomic_xor_bits(&page->_mapcount, bit | (bit << 4));
- if (mask & FRAG_MASK)
+ mask = atomic_xor_bits(&page->_mapcount, 0x11U << bit);
+ if (mask & 3)
list_add_tail(&page->lru, &mm->context.pgtable_list);
+ else
+ list_del(&page->lru);
spin_unlock_bh(&mm->context.list_lock);
- table = (unsigned long *) (__pa(table) | (bit << 4));
+ table = (unsigned long *) (__pa(table) | (1U << bit));
tlb_remove_table(tlb, table);
}
static void __tlb_remove_table(void *_table)
{
- const unsigned long mask = (FRAG_MASK << 4) | FRAG_MASK;
- void *table = (void *)((unsigned long) _table & ~mask);
- unsigned type = (unsigned long) _table & mask;
-
- if (type)
- __page_table_free_rcu(table, type);
- else
- free_pages((unsigned long) table, ALLOC_ORDER);
+ unsigned int mask = (unsigned long) _table & 3;
+ void *table = (void *)((unsigned long) _table ^ mask);
+ struct page *page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
+
+ switch (mask) {
+ case 0: /* pmd or pud */
+ free_pages((unsigned long) table, 2);
+ break;
+ case 1: /* lower 2K of a 4K page table */
+ case 2: /* higher 2K of a 4K page table */
+ if (atomic_xor_bits(&page->_mapcount, mask << 4) != 0)
+ break;
+ /* fallthrough */
+ case 3: /* 4K page table with pgstes */
+ pgtable_page_dtor(page);
+ atomic_set(&page->_mapcount, -1);
+ __free_page(page);
+ break;
+ }
}
static void tlb_remove_table_smp_sync(void *arg)