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-rw-r--r--include/asm-s390/pgtable.h127
1 files changed, 118 insertions, 9 deletions
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 65154dc9a9e..c7f4f8e3e29 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -30,6 +30,7 @@
*/
#ifndef __ASSEMBLY__
#include <linux/mm_types.h>
+#include <asm/bitops.h>
#include <asm/bug.h>
#include <asm/processor.h>
@@ -128,7 +129,7 @@ extern char empty_zero_page[PAGE_SIZE];
#define VMEM_MAX_PAGES ((VMEM_MAP_END - VMALLOC_END) / sizeof(struct page))
#define VMEM_MAX_PFN min(VMALLOC_START >> PAGE_SHIFT, VMEM_MAX_PAGES)
#define VMEM_MAX_PHYS ((VMEM_MAX_PFN << PAGE_SHIFT) & ~((16 << 20) - 1))
-#define VMEM_MAP ((struct page *) VMALLOC_END)
+#define vmemmap ((struct page *) VMALLOC_END)
/*
* A 31 bit pagetable entry of S390 has following format:
@@ -219,6 +220,8 @@ extern char empty_zero_page[PAGE_SIZE];
/* Software bits in the page table entry */
#define _PAGE_SWT 0x001 /* SW pte type bit t */
#define _PAGE_SWX 0x002 /* SW pte type bit x */
+#define _PAGE_SPECIAL 0x004 /* SW associated with special page */
+#define __HAVE_ARCH_PTE_SPECIAL
/* Six different types of pages. */
#define _PAGE_TYPE_EMPTY 0x400
@@ -231,6 +234,15 @@ extern char empty_zero_page[PAGE_SIZE];
#define _PAGE_TYPE_EX_RW 0x002
/*
+ * Only four types for huge pages, using the invalid bit and protection bit
+ * of a segment table entry.
+ */
+#define _HPAGE_TYPE_EMPTY 0x020 /* _SEGMENT_ENTRY_INV */
+#define _HPAGE_TYPE_NONE 0x220
+#define _HPAGE_TYPE_RO 0x200 /* _SEGMENT_ENTRY_RO */
+#define _HPAGE_TYPE_RW 0x000
+
+/*
* PTE type bits are rather complicated. handle_pte_fault uses pte_present,
* pte_none and pte_file to find out the pte type WITHOUT holding the page
* table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to
@@ -258,6 +270,13 @@ extern char empty_zero_page[PAGE_SIZE];
* swap pte is 1011 and 0001, 0011, 0101, 0111 are invalid.
*/
+/* Page status table bits for virtualization */
+#define RCP_PCL_BIT 55
+#define RCP_HR_BIT 54
+#define RCP_HC_BIT 53
+#define RCP_GR_BIT 50
+#define RCP_GC_BIT 49
+
#ifndef __s390x__
/* Bits in the segment table address-space-control-element */
@@ -315,6 +334,9 @@ extern char empty_zero_page[PAGE_SIZE];
#define _SEGMENT_ENTRY (0)
#define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
+#define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */
+#define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */
+
#endif /* __s390x__ */
/*
@@ -510,9 +532,56 @@ static inline int pte_file(pte_t pte)
return (pte_val(pte) & mask) == _PAGE_TYPE_FILE;
}
+static inline int pte_special(pte_t pte)
+{
+ return (pte_val(pte) & _PAGE_SPECIAL);
+}
+
#define __HAVE_ARCH_PTE_SAME
#define pte_same(a,b) (pte_val(a) == pte_val(b))
+static inline void rcp_lock(pte_t *ptep)
+{
+#ifdef CONFIG_PGSTE
+ unsigned long *pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
+ preempt_disable();
+ while (test_and_set_bit(RCP_PCL_BIT, pgste))
+ ;
+#endif
+}
+
+static inline void rcp_unlock(pte_t *ptep)
+{
+#ifdef CONFIG_PGSTE
+ unsigned long *pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
+ clear_bit(RCP_PCL_BIT, pgste);
+ preempt_enable();
+#endif
+}
+
+/* forward declaration for SetPageUptodate in page-flags.h*/
+static inline void page_clear_dirty(struct page *page);
+#include <linux/page-flags.h>
+
+static inline void ptep_rcp_copy(pte_t *ptep)
+{
+#ifdef CONFIG_PGSTE
+ struct page *page = virt_to_page(pte_val(*ptep));
+ unsigned int skey;
+ unsigned long *pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
+
+ skey = page_get_storage_key(page_to_phys(page));
+ if (skey & _PAGE_CHANGED)
+ set_bit_simple(RCP_GC_BIT, pgste);
+ if (skey & _PAGE_REFERENCED)
+ set_bit_simple(RCP_GR_BIT, pgste);
+ if (test_and_clear_bit_simple(RCP_HC_BIT, pgste))
+ SetPageDirty(page);
+ if (test_and_clear_bit_simple(RCP_HR_BIT, pgste))
+ SetPageReferenced(page);
+#endif
+}
+
/*
* query functions pte_write/pte_dirty/pte_young only work if
* pte_present() is true. Undefined behaviour if not..
@@ -599,6 +668,8 @@ static inline void pmd_clear(pmd_t *pmd)
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
+ if (mm->context.pgstes)
+ ptep_rcp_copy(ptep);
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
if (mm->context.noexec)
pte_val(ptep[PTRS_PER_PTE]) = _PAGE_TYPE_EMPTY;
@@ -663,10 +734,34 @@ static inline pte_t pte_mkyoung(pte_t pte)
return pte;
}
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+ pte_val(pte) |= _PAGE_SPECIAL;
+ return pte;
+}
+
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
+#ifdef CONFIG_PGSTE
+ unsigned long physpage;
+ int young;
+ unsigned long *pgste;
+
+ if (!vma->vm_mm->context.pgstes)
+ return 0;
+ physpage = pte_val(*ptep) & PAGE_MASK;
+ pgste = (unsigned long *) (ptep + PTRS_PER_PTE);
+
+ young = ((page_get_storage_key(physpage) & _PAGE_REFERENCED) != 0);
+ rcp_lock(ptep);
+ if (young)
+ set_bit_simple(RCP_GR_BIT, pgste);
+ young |= test_and_clear_bit_simple(RCP_HR_BIT, pgste);
+ rcp_unlock(ptep);
+ return young;
+#endif
return 0;
}
@@ -674,7 +769,13 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
- /* No need to flush TLB; bits are in storage key */
+ /* No need to flush TLB
+ * On s390 reference bits are in storage key and never in TLB
+ * With virtualization we handle the reference bit, without we
+ * we can simply return */
+#ifdef CONFIG_PGSTE
+ return ptep_test_and_clear_young(vma, address, ptep);
+#endif
return 0;
}
@@ -693,15 +794,25 @@ static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
: "=m" (*ptep) : "m" (*ptep),
"a" (pto), "a" (address));
}
- pte_val(*ptep) = _PAGE_TYPE_EMPTY;
}
static inline void ptep_invalidate(struct mm_struct *mm,
unsigned long address, pte_t *ptep)
{
+ if (mm->context.pgstes) {
+ rcp_lock(ptep);
+ __ptep_ipte(address, ptep);
+ ptep_rcp_copy(ptep);
+ pte_val(*ptep) = _PAGE_TYPE_EMPTY;
+ rcp_unlock(ptep);
+ return;
+ }
__ptep_ipte(address, ptep);
- if (mm->context.noexec)
+ pte_val(*ptep) = _PAGE_TYPE_EMPTY;
+ if (mm->context.noexec) {
__ptep_ipte(address, ptep + PTRS_PER_PTE);
+ pte_val(*(ptep + PTRS_PER_PTE)) = _PAGE_TYPE_EMPTY;
+ }
}
/*
@@ -964,17 +1075,15 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
#define kern_addr_valid(addr) (1)
-extern int add_shared_memory(unsigned long start, unsigned long size);
-extern int remove_shared_memory(unsigned long start, unsigned long size);
+extern int vmem_add_mapping(unsigned long start, unsigned long size);
+extern int vmem_remove_mapping(unsigned long start, unsigned long size);
+extern int s390_enable_sie(void);
/*
* No page table caches to initialise
*/
#define pgtable_cache_init() do { } while (0)
-#define __HAVE_ARCH_MEMMAP_INIT
-extern void memmap_init(unsigned long, int, unsigned long, unsigned long);
-
#include <asm-generic/pgtable.h>
#endif /* _S390_PAGE_H */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-26 20:58:48 +0000