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-rw-r--r--arch/s390/mm/Makefile2
-rw-r--r--arch/s390/mm/cmm.c8
-rw-r--r--arch/s390/mm/fault.c9
-rw-r--r--arch/s390/mm/hugetlbpage.c2
-rw-r--r--arch/s390/mm/init.c56
-rw-r--r--arch/s390/mm/mem_detect.c134
-rw-r--r--arch/s390/mm/pageattr.c24
-rw-r--r--arch/s390/mm/pgtable.c331
-rw-r--r--arch/s390/mm/vmem.c23
9 files changed, 453 insertions, 136 deletions
diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index 640bea12303c..839592ca265c 100644
--- a/arch/s390/mm/Makefile
+++ b/arch/s390/mm/Makefile
@@ -3,7 +3,7 @@
#
obj-y := init.o fault.o extmem.o mmap.o vmem.o pgtable.o maccess.o
-obj-y += page-states.o gup.o extable.o pageattr.o
+obj-y += page-states.o gup.o extable.o pageattr.o mem_detect.o
obj-$(CONFIG_CMM) += cmm.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index 479e94282910..9d84a1feefef 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -458,12 +458,10 @@ static int __init cmm_init(void)
if (rc)
goto out_pm;
cmm_thread_ptr = kthread_run(cmm_thread, NULL, "cmmthread");
- rc = IS_ERR(cmm_thread_ptr) ? PTR_ERR(cmm_thread_ptr) : 0;
- if (rc)
- goto out_kthread;
- return 0;
+ if (!IS_ERR(cmm_thread_ptr))
+ return 0;
-out_kthread:
+ rc = PTR_ERR(cmm_thread_ptr);
unregister_pm_notifier(&cmm_power_notifier);
out_pm:
unregister_oom_notifier(&cmm_oom_nb);
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 2fb9e63b8fc4..047c3e4c59a2 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -395,8 +395,13 @@ void __kprobes do_protection_exception(struct pt_regs *regs)
int fault;
trans_exc_code = regs->int_parm_long;
- /* Protection exception is suppressing, decrement psw address. */
- regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
+ /*
+ * Protection exceptions are suppressing, decrement psw address.
+ * The exception to this rule are aborted transactions, for these
+ * the PSW already points to the correct location.
+ */
+ if (!(regs->int_code & 0x200))
+ regs->psw.addr = __rewind_psw(regs->psw, regs->int_code >> 16);
/*
* Check for low-address protection. This needs to be treated
* as a special case because the translation exception code
diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 532525ec88c1..121089d57802 100644
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -39,7 +39,7 @@ int arch_prepare_hugepage(struct page *page)
if (!ptep)
return -ENOMEM;
- pte = mk_pte(page, PAGE_RW);
+ pte_val(pte) = addr;
for (i = 0; i < PTRS_PER_PTE; i++) {
set_pte_at(&init_mm, addr + i * PAGE_SIZE, ptep + i, pte);
pte_val(pte) += PAGE_SIZE;
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 49ce6bb2c641..89ebae4008f2 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -21,6 +21,7 @@
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
+#include <linux/memory.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/initrd.h>
@@ -36,17 +37,17 @@
#include <asm/tlbflush.h>
#include <asm/sections.h>
#include <asm/ctl_reg.h>
+#include <asm/sclp.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
unsigned long empty_zero_page, zero_page_mask;
EXPORT_SYMBOL(empty_zero_page);
-static unsigned long __init setup_zero_pages(void)
+static void __init setup_zero_pages(void)
{
struct cpuid cpu_id;
unsigned int order;
- unsigned long size;
struct page *page;
int i;
@@ -63,10 +64,18 @@ static unsigned long __init setup_zero_pages(void)
break;
case 0x2097: /* z10 */
case 0x2098: /* z10 */
- default:
+ case 0x2817: /* z196 */
+ case 0x2818: /* z196 */
order = 2;
break;
+ case 0x2827: /* zEC12 */
+ default:
+ order = 5;
+ break;
}
+ /* Limit number of empty zero pages for small memory sizes */
+ if (order > 2 && totalram_pages <= 16384)
+ order = 2;
empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!empty_zero_page)
@@ -75,14 +84,11 @@ static unsigned long __init setup_zero_pages(void)
page = virt_to_page((void *) empty_zero_page);
split_page(page, order);
for (i = 1 << order; i > 0; i--) {
- SetPageReserved(page);
+ mark_page_reserved(page);
page++;
}
- size = PAGE_SIZE << order;
- zero_page_mask = (size - 1) & PAGE_MASK;
-
- return 1UL << order;
+ zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
}
/*
@@ -139,7 +145,7 @@ void __init mem_init(void)
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem();
- totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
+ setup_zero_pages(); /* Setup zeroed pages. */
reservedpages = 0;
@@ -158,34 +164,15 @@ void __init mem_init(void)
PFN_ALIGN((unsigned long)&_eshared) - 1);
}
-void free_init_pages(char *what, unsigned long begin, unsigned long end)
-{
- unsigned long addr = begin;
-
- if (begin >= end)
- return;
- for (; addr < end; addr += PAGE_SIZE) {
- ClearPageReserved(virt_to_page(addr));
- init_page_count(virt_to_page(addr));
- memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
- PAGE_SIZE);
- free_page(addr);
- totalram_pages++;
- }
- printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
-}
-
void free_initmem(void)
{
- free_init_pages("unused kernel memory",
- (unsigned long)&__init_begin,
- (unsigned long)&__init_end);
+ free_initmem_default(0);
}
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
- free_init_pages("initrd memory", start, end);
+ free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
}
#endif
@@ -229,6 +216,15 @@ int arch_add_memory(int nid, u64 start, u64 size)
return rc;
}
+unsigned long memory_block_size_bytes(void)
+{
+ /*
+ * Make sure the memory block size is always greater
+ * or equal than the memory increment size.
+ */
+ return max_t(unsigned long, MIN_MEMORY_BLOCK_SIZE, sclp_get_rzm());
+}
+
#ifdef CONFIG_MEMORY_HOTREMOVE
int arch_remove_memory(u64 start, u64 size)
{
diff --git a/arch/s390/mm/mem_detect.c b/arch/s390/mm/mem_detect.c
new file mode 100644
index 000000000000..3cbd3b8bf311
--- /dev/null
+++ b/arch/s390/mm/mem_detect.c
@@ -0,0 +1,134 @@
+/*
+ * Copyright IBM Corp. 2008, 2009
+ *
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <asm/ipl.h>
+#include <asm/sclp.h>
+#include <asm/setup.h>
+
+#define ADDR2G (1ULL << 31)
+
+static void find_memory_chunks(struct mem_chunk chunk[], unsigned long maxsize)
+{
+ unsigned long long memsize, rnmax, rzm;
+ unsigned long addr = 0, size;
+ int i = 0, type;
+
+ rzm = sclp_get_rzm();
+ rnmax = sclp_get_rnmax();
+ memsize = rzm * rnmax;
+ if (!rzm)
+ rzm = 1ULL << 17;
+ if (sizeof(long) == 4) {
+ rzm = min(ADDR2G, rzm);
+ memsize = memsize ? min(ADDR2G, memsize) : ADDR2G;
+ }
+ if (maxsize)
+ memsize = memsize ? min((unsigned long)memsize, maxsize) : maxsize;
+ do {
+ size = 0;
+ type = tprot(addr);
+ do {
+ size += rzm;
+ if (memsize && addr + size >= memsize)
+ break;
+ } while (type == tprot(addr + size));
+ if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
+ if (memsize && (addr + size > memsize))
+ size = memsize - addr;
+ chunk[i].addr = addr;
+ chunk[i].size = size;
+ chunk[i].type = type;
+ i++;
+ }
+ addr += size;
+ } while (addr < memsize && i < MEMORY_CHUNKS);
+}
+
+/**
+ * detect_memory_layout - fill mem_chunk array with memory layout data
+ * @chunk: mem_chunk array to be filled
+ * @maxsize: maximum address where memory detection should stop
+ *
+ * Fills the passed in memory chunk array with the memory layout of the
+ * machine. The array must have a size of at least MEMORY_CHUNKS and will
+ * be fully initialized afterwards.
+ * If the maxsize paramater has a value > 0 memory detection will stop at
+ * that address. It is guaranteed that all chunks have an ending address
+ * that is smaller than maxsize.
+ * If maxsize is 0 all memory will be detected.
+ */
+void detect_memory_layout(struct mem_chunk chunk[], unsigned long maxsize)
+{
+ unsigned long flags, flags_dat, cr0;
+
+ memset(chunk, 0, MEMORY_CHUNKS * sizeof(struct mem_chunk));
+ /*
+ * Disable IRQs, DAT and low address protection so tprot does the
+ * right thing and we don't get scheduled away with low address
+ * protection disabled.
+ */
+ local_irq_save(flags);
+ flags_dat = __arch_local_irq_stnsm(0xfb);
+ /*
+ * In case DAT was enabled, make sure chunk doesn't reside in vmalloc
+ * space. We have disabled DAT and any access to vmalloc area will
+ * cause an exception.
+ * If DAT was disabled we are called from early ipl code.
+ */
+ if (test_bit(5, &flags_dat)) {
+ if (WARN_ON_ONCE(is_vmalloc_or_module_addr(chunk)))
+ goto out;
+ }
+ __ctl_store(cr0, 0, 0);
+ __ctl_clear_bit(0, 28);
+ find_memory_chunks(chunk, maxsize);
+ __ctl_load(cr0, 0, 0);
+out:
+ __arch_local_irq_ssm(flags_dat);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(detect_memory_layout);
+
+/*
+ * Create memory hole with given address and size.
+ */
+void create_mem_hole(struct mem_chunk mem_chunk[], unsigned long addr,
+ unsigned long size)
+{
+ int i;
+
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ struct mem_chunk *chunk = &mem_chunk[i];
+
+ if (chunk->size == 0)
+ continue;
+ if (addr > chunk->addr + chunk->size)
+ continue;
+ if (addr + size <= chunk->addr)
+ continue;
+ /* Split */
+ if ((addr > chunk->addr) &&
+ (addr + size < chunk->addr + chunk->size)) {
+ struct mem_chunk *new = chunk + 1;
+
+ memmove(new, chunk, (MEMORY_CHUNKS-i-1) * sizeof(*new));
+ new->addr = addr + size;
+ new->size = chunk->addr + chunk->size - new->addr;
+ chunk->size = addr - chunk->addr;
+ continue;
+ } else if ((addr <= chunk->addr) &&
+ (addr + size >= chunk->addr + chunk->size)) {
+ memset(chunk, 0 , sizeof(*chunk));
+ } else if (addr + size < chunk->addr + chunk->size) {
+ chunk->size = chunk->addr + chunk->size - addr - size;
+ chunk->addr = addr + size;
+ } else if (addr > chunk->addr) {
+ chunk->size = addr - chunk->addr;
+ }
+ }
+}
diff --git a/arch/s390/mm/pageattr.c b/arch/s390/mm/pageattr.c
index d21040ed5e59..80adfbf75065 100644
--- a/arch/s390/mm/pageattr.c
+++ b/arch/s390/mm/pageattr.c
@@ -9,31 +9,25 @@
#include <asm/pgtable.h>
#include <asm/page.h>
+static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
+{
+ asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
+ : [addr] "+a" (addr) : [skey] "d" (skey));
+ return addr;
+}
+
void storage_key_init_range(unsigned long start, unsigned long end)
{
- unsigned long boundary, function, size;
+ unsigned long boundary, size;
while (start < end) {
- if (MACHINE_HAS_EDAT2) {
- /* set storage keys for a 2GB frame */
- function = 0x22000 | PAGE_DEFAULT_KEY;
- size = 1UL << 31;
- boundary = (start + size) & ~(size - 1);
- if (boundary <= end) {
- do {
- start = pfmf(function, start);
- } while (start < boundary);
- continue;
- }
- }
if (MACHINE_HAS_EDAT1) {
/* set storage keys for a 1MB frame */
- function = 0x21000 | PAGE_DEFAULT_KEY;
size = 1UL << 20;
boundary = (start + size) & ~(size - 1);
if (boundary <= end) {
do {
- start = pfmf(function, start);
+ start = sske_frame(start, PAGE_DEFAULT_KEY);
} while (start < boundary);
continue;
}
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index ae44d2a34313..a938b548f07e 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -379,75 +379,184 @@ out_unmap:
}
EXPORT_SYMBOL_GPL(gmap_map_segment);
-/*
- * this function is assumed to be called with mmap_sem held
- */
-unsigned long __gmap_fault(unsigned long address, struct gmap *gmap)
+static unsigned long *gmap_table_walk(unsigned long address, struct gmap *gmap)
{
- unsigned long *table, vmaddr, segment;
- struct mm_struct *mm;
- struct gmap_pgtable *mp;
- struct gmap_rmap *rmap;
- struct vm_area_struct *vma;
- struct page *page;
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
+ unsigned long *table;
- current->thread.gmap_addr = address;
- mm = gmap->mm;
- /* Walk the gmap address space page table */
table = gmap->table + ((address >> 53) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
- return -EFAULT;
+ return ERR_PTR(-EFAULT);
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + ((address >> 42) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
- return -EFAULT;
+ return ERR_PTR(-EFAULT);
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + ((address >> 31) & 0x7ff);
if (unlikely(*table & _REGION_ENTRY_INV))
- return -EFAULT;
+ return ERR_PTR(-EFAULT);
table = (unsigned long *)(*table & _REGION_ENTRY_ORIGIN);
table = table + ((address >> 20) & 0x7ff);
+ return table;
+}
+/**
+ * __gmap_translate - translate a guest address to a user space address
+ * @address: guest address
+ * @gmap: pointer to guest mapping meta data structure
+ *
+ * Returns user space address which corresponds to the guest address or
+ * -EFAULT if no such mapping exists.
+ * This function does not establish potentially missing page table entries.
+ * The mmap_sem of the mm that belongs to the address space must be held
+ * when this function gets called.
+ */
+unsigned long __gmap_translate(unsigned long address, struct gmap *gmap)
+{
+ unsigned long *segment_ptr, vmaddr, segment;
+ struct gmap_pgtable *mp;
+ struct page *page;
+
+ current->thread.gmap_addr = address;
+ segment_ptr = gmap_table_walk(address, gmap);
+ if (IS_ERR(segment_ptr))
+ return PTR_ERR(segment_ptr);
/* Convert the gmap address to an mm address. */
- segment = *table;
- if (likely(!(segment & _SEGMENT_ENTRY_INV))) {
+ segment = *segment_ptr;
+ if (!(segment & _SEGMENT_ENTRY_INV)) {
page = pfn_to_page(segment >> PAGE_SHIFT);
mp = (struct gmap_pgtable *) page->index;
return mp->vmaddr | (address & ~PMD_MASK);
} else if (segment & _SEGMENT_ENTRY_RO) {
vmaddr = segment & _SEGMENT_ENTRY_ORIGIN;
- vma = find_vma(mm, vmaddr);
- if (!vma || vma->vm_start > vmaddr)
- return -EFAULT;
-
- /* Walk the parent mm page table */
- pgd = pgd_offset(mm, vmaddr);
- pud = pud_alloc(mm, pgd, vmaddr);
- if (!pud)
- return -ENOMEM;
- pmd = pmd_alloc(mm, pud, vmaddr);
- if (!pmd)
- return -ENOMEM;
- if (!pmd_present(*pmd) &&
- __pte_alloc(mm, vma, pmd, vmaddr))
- return -ENOMEM;
- /* pmd now points to a valid segment table entry. */
- rmap = kmalloc(sizeof(*rmap), GFP_KERNEL|__GFP_REPEAT);
- if (!rmap)
- return -ENOMEM;
- /* Link gmap segment table entry location to page table. */
- page = pmd_page(*pmd);
- mp = (struct gmap_pgtable *) page->index;
- rmap->entry = table;
- spin_lock(&mm->page_table_lock);
+ return vmaddr | (address & ~PMD_MASK);
+ }
+ return -EFAULT;
+}
+EXPORT_SYMBOL_GPL(__gmap_translate);
+
+/**
+ * gmap_translate - translate a guest address to a user space address
+ * @address: guest address
+ * @gmap: pointer to guest mapping meta data structure
+ *
+ * Returns user space address which corresponds to the guest address or
+ * -EFAULT if no such mapping exists.
+ * This function does not establish potentially missing page table entries.
+ */
+unsigned long gmap_translate(unsigned long address, struct gmap *gmap)
+{
+ unsigned long rc;
+
+ down_read(&gmap->mm->mmap_sem);
+ rc = __gmap_translate(address, gmap);
+ up_read(&gmap->mm->mmap_sem);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(gmap_translate);
+
+static int gmap_connect_pgtable(unsigned long address, unsigned long segment,
+ unsigned long *segment_ptr, struct gmap *gmap)
+{
+ unsigned long vmaddr;
+ struct vm_area_struct *vma;
+ struct gmap_pgtable *mp;
+ struct gmap_rmap *rmap;
+ struct mm_struct *mm;
+ struct page *page;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ mm = gmap->mm;
+ vmaddr = segment & _SEGMENT_ENTRY_ORIGIN;
+ vma = find_vma(mm, vmaddr);
+ if (!vma || vma->vm_start > vmaddr)
+ return -EFAULT;
+ /* Walk the parent mm page table */
+ pgd = pgd_offset(mm, vmaddr);
+ pud = pud_alloc(mm, pgd, vmaddr);
+ if (!pud)
+ return -ENOMEM;
+ pmd = pmd_alloc(mm, pud, vmaddr);
+ if (!pmd)
+ return -ENOMEM;
+ if (!pmd_present(*pmd) &&
+ __pte_alloc(mm, vma, pmd, vmaddr))
+ return -ENOMEM;
+ /* pmd now points to a valid segment table entry. */
+ rmap = kmalloc(sizeof(*rmap), GFP_KERNEL|__GFP_REPEAT);
+ if (!rmap)
+ return -ENOMEM;
+ /* Link gmap segment table entry location to page table. */
+ page = pmd_page(*pmd);
+ mp = (struct gmap_pgtable *) page->index;
+ rmap->gmap = gmap;
+ rmap->entry = segment_ptr;
+ rmap->vmaddr = address & PMD_MASK;
+ spin_lock(&mm->page_table_lock);
+ if (*segment_ptr == segment) {
list_add(&rmap->list, &mp->mapper);
- spin_unlock(&mm->page_table_lock);
/* Set gmap segment table entry to page table. */
- *table = pmd_val(*pmd) & PAGE_MASK;
- return vmaddr | (address & ~PMD_MASK);
+ *segment_ptr = pmd_val(*pmd) & PAGE_MASK;
+ rmap = NULL;
+ }
+ spin_unlock(&mm->page_table_lock);
+ kfree(rmap);
+ return 0;
+}
+
+static void gmap_disconnect_pgtable(struct mm_struct *mm, unsigned long *table)
+{
+ struct gmap_rmap *rmap, *next;
+ struct gmap_pgtable *mp;
+ struct page *page;
+ int flush;
+
+ flush = 0;
+ spin_lock(&mm->page_table_lock);
+ page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
+ mp = (struct gmap_pgtable *) page->index;
+ list_for_each_entry_safe(rmap, next, &mp->mapper, list) {
+ *rmap->entry =
+ _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO | mp->vmaddr;
+ list_del(&rmap->list);
+ kfree(rmap);
+ flush = 1;
+ }
+ spin_unlock(&mm->page_table_lock);
+ if (flush)
+ __tlb_flush_global();
+}
+
+/*
+ * this function is assumed to be called with mmap_sem held
+ */
+unsigned long __gmap_fault(unsigned long address, struct gmap *gmap)
+{
+ unsigned long *segment_ptr, segment;
+ struct gmap_pgtable *mp;
+ struct page *page;
+ int rc;
+
+ current->thread.gmap_addr = address;
+ segment_ptr = gmap_table_walk(address, gmap);
+ if (IS_ERR(segment_ptr))
+ return -EFAULT;
+ /* Convert the gmap address to an mm address. */
+ while (1) {
+ segment = *segment_ptr;
+ if (!(segment & _SEGMENT_ENTRY_INV)) {
+ /* Page table is present */
+ page = pfn_to_page(segment >> PAGE_SHIFT);
+ mp = (struct gmap_pgtable *) page->index;
+ return mp->vmaddr | (address & ~PMD_MASK);
+ }
+ if (!(segment & _SEGMENT_ENTRY_RO))
+ /* Nothing mapped in the gmap address space. */
+ break;
+ rc = gmap_connect_pgtable(address, segment, segment_ptr, gmap);
+ if (rc)
+ return rc;
}
return -EFAULT;
}
@@ -511,27 +620,115 @@ void gmap_discard(unsigned long from, unsigned long to, struct gmap *gmap)
}
EXPORT_SYMBOL_GPL(gmap_discard);
-void gmap_unmap_notifier(struct mm_struct *mm, unsigned long *table)
+static LIST_HEAD(gmap_notifier_list);
+static DEFINE_SPINLOCK(gmap_notifier_lock);
+
+/**
+ * gmap_register_ipte_notifier - register a pte invalidation callback
+ * @nb: pointer to the gmap notifier block
+ */
+void gmap_register_ipte_notifier(struct gmap_notifier *nb)
{
- struct gmap_rmap *rmap, *next;
+ spin_lock(&gmap_notifier_lock);
+ list_add(&nb->list, &gmap_notifier_list);
+ spin_unlock(&gmap_notifier_lock);
+}
+EXPORT_SYMBOL_GPL(gmap_register_ipte_notifier);
+
+/**
+ * gmap_unregister_ipte_notifier - remove a pte invalidation callback
+ * @nb: pointer to the gmap notifier block
+ */
+void gmap_unregister_ipte_notifier(struct gmap_notifier *nb)
+{
+ spin_lock(&gmap_notifier_lock);
+ list_del_init(&nb->list);
+ spin_unlock(&gmap_notifier_lock);
+}
+EXPORT_SYMBOL_GPL(gmap_unregister_ipte_notifier);
+
+/**
+ * gmap_ipte_notify - mark a range of ptes for invalidation notification
+ * @gmap: pointer to guest mapping meta data structure
+ * @address: virtual address in the guest address space
+ * @len: size of area
+ *
+ * Returns 0 if for each page in the given range a gmap mapping exists and
+ * the invalidation notification could be set. If the gmap mapping is missing
+ * for one or more pages -EFAULT is returned. If no memory could be allocated
+ * -ENOMEM is returned. This function establishes missing page table entries.
+ */
+int gmap_ipte_notify(struct gmap *gmap, unsigned long start, unsigned long len)
+{
+ unsigned long addr;
+ spinlock_t *ptl;
+ pte_t *ptep, entry;
+ pgste_t pgste;
+ int rc = 0;
+
+ if ((start & ~PAGE_MASK) || (len & ~PAGE_MASK))
+ return -EINVAL;
+ down_read(&gmap->mm->mmap_sem);
+ while (len) {
+ /* Convert gmap address and connect the page tables */
+ addr = __gmap_fault(start, gmap);
+ if (IS_ERR_VALUE(addr)) {
+ rc = addr;
+ break;
+ }
+ /* Get the page mapped */
+ if (fixup_user_fault(current, gmap->mm, addr, FAULT_FLAG_WRITE)) {
+ rc = -EFAULT;
+ break;
+ }
+ /* Walk the process page table, lock and get pte pointer */
+ ptep = get_locked_pte(gmap->mm, addr, &ptl);
+ if (unlikely(!ptep))
+ continue;
+ /* Set notification bit in the pgste of the pte */
+ entry = *ptep;
+ if ((pte_val(entry) & (_PAGE_INVALID | _PAGE_RO)) == 0) {
+ pgste = pgste_get_lock(ptep);
+ pgste_val(pgste) |= RCP_IN_BIT;
+ pgste_set_unlock(ptep, pgste);
+ start += PAGE_SIZE;
+ len -= PAGE_SIZE;
+ }
+ spin_unlock(ptl);
+ }
+ up_read(&gmap->mm->mmap_sem);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(gmap_ipte_notify);
+
+/**
+ * gmap_do_ipte_notify - call all invalidation callbacks for a specific pte.
+ * @mm: pointer to the process mm_struct
+ * @addr: virtual address in the process address space
+ * @pte: pointer to the page table entry
+ *
+ * This function is assumed to be called with the page table lock held
+ * for the pte to notify.
+ */
+void gmap_do_ipte_notify(struct mm_struct *mm, unsigned long addr, pte_t *pte)
+{
+ unsigned long segment_offset;
+ struct gmap_notifier *nb;
struct gmap_pgtable *mp;
+ struct gmap_rmap *rmap;
struct page *page;
- int flush;
- flush = 0;
- spin_lock(&mm->page_table_lock);
- page = pfn_to_page(__pa(table) >> PAGE_SHIFT);
+ segment_offset = ((unsigned long) pte) & (255 * sizeof(pte_t));
+ segment_offset = segment_offset * (4096 / sizeof(pte_t));
+ page = pfn_to_page(__pa(pte) >> PAGE_SHIFT);
mp = (struct gmap_pgtable *) page->index;
- list_for_each_entry_safe(rmap, next, &mp->mapper, list) {
- *rmap->entry =
- _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO | mp->vmaddr;
- list_del(&rmap->list);
- kfree(rmap);
- flush = 1;
+ spin_lock(&gmap_notifier_lock);
+ list_for_each_entry(rmap, &mp->mapper, list) {
+ list_for_each_entry(nb, &gmap_notifier_list, list)
+ nb->notifier_call(rmap->gmap,
+ rmap->vmaddr + segment_offset);
}
- spin_unlock(&mm->page_table_lock);
- if (flush)
- __tlb_flush_global();
+ spin_unlock(&gmap_notifier_lock);
}
static inline unsigned long *page_table_alloc_pgste(struct mm_struct *mm,
@@ -586,8 +783,8 @@ static inline void page_table_free_pgste(unsigned long *table)
{
}
-static inline void gmap_unmap_notifier(struct mm_struct *mm,
- unsigned long *table)
+static inline void gmap_disconnect_pgtable(struct mm_struct *mm,
+ unsigned long *table)
{
}
@@ -653,7 +850,7 @@ void page_table_free(struct mm_struct *mm, unsigned long *table)
unsigned int bit, mask;
if (mm_has_pgste(mm)) {
- gmap_unmap_notifier(mm, table);
+ gmap_disconnect_pgtable(mm, table);
return page_table_free_pgste(table);
}
/* Free 1K/2K page table fragment of a 4K page */
@@ -696,7 +893,7 @@ void page_table_free_rcu(struct mmu_gather *tlb, unsigned long *table)
mm = tlb->mm;
if (mm_has_pgste(mm)) {
- gmap_unmap_notifier(mm, table);
+ gmap_disconnect_pgtable(mm, table);
table = (unsigned long *) (__pa(table) | FRAG_MASK);
tlb_remove_table(tlb, table);
return;
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index ffab84db6907..8b268fcc4612 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -191,19 +191,16 @@ static void vmem_remove_range(unsigned long start, unsigned long size)
/*
* Add a backed mem_map array to the virtual mem_map array.
*/
-int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node)
+int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
{
- unsigned long address, start_addr, end_addr;
+ unsigned long address = start;
pgd_t *pg_dir;
pud_t *pu_dir;
pmd_t *pm_dir;
pte_t *pt_dir;
int ret = -ENOMEM;
- start_addr = (unsigned long) start;
- end_addr = (unsigned long) (start + nr);
-
- for (address = start_addr; address < end_addr;) {
+ for (address = start; address < end;) {
pg_dir = pgd_offset_k(address);
if (pgd_none(*pg_dir)) {
pu_dir = vmem_pud_alloc();
@@ -262,14 +259,14 @@ int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node)
}
address += PAGE_SIZE;
}
- memset(start, 0, nr * sizeof(struct page));
+ memset((void *)start, 0, end - start);
ret = 0;
out:
- flush_tlb_kernel_range(start_addr, end_addr);
+ flush_tlb_kernel_range(start, end);
return ret;
}
-void vmemmap_free(struct page *memmap, unsigned long nr_pages)
+void vmemmap_free(unsigned long start, unsigned long end)
{
}
@@ -378,9 +375,8 @@ void __init vmem_map_init(void)
ro_start = PFN_ALIGN((unsigned long)&_stext);
ro_end = (unsigned long)&_eshared & PAGE_MASK;
- for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
- if (memory_chunk[i].type == CHUNK_CRASHK ||
- memory_chunk[i].type == CHUNK_OLDMEM)
+ for (i = 0; i < MEMORY_CHUNKS; i++) {
+ if (!memory_chunk[i].size)
continue;
start = memory_chunk[i].addr;
end = memory_chunk[i].addr + memory_chunk[i].size;
@@ -415,9 +411,6 @@ static int __init vmem_convert_memory_chunk(void)
for (i = 0; i < MEMORY_CHUNKS; i++) {
if (!memory_chunk[i].size)
continue;
- if (memory_chunk[i].type == CHUNK_CRASHK ||
- memory_chunk[i].type == CHUNK_OLDMEM)
- continue;
seg = kzalloc(sizeof(*seg), GFP_KERNEL);
if (!seg)
panic("Out of memory...\n");
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-04 09:11:19 +0100