patch-2.4.2 linux/include/asm-s390/pgalloc.h

• Lines: 461
• Date: Tue Feb 13 14:13:44 2001
• Orig file: v2.4.1/linux/include/asm-s390/pgalloc.h
• Orig date: Fri May 12 11:41:44 2000

diff -u --recursive --new-file v2.4.1/linux/include/asm-s390/pgalloc.h linux/include/asm-s390/pgalloc.h
@@ -31,7 +31,7 @@
 extern __inline__ pgd_t* get_pgd_slow(void)
 {
         int i;
-        pgd_t *pgd,*ret = (pgd_t *)__get_free_pages(GFP_KERNEL,2);
+        pgd_t *pgd,*ret = (pgd_t *)__get_free_pages(GFP_KERNEL,1);
 	if (ret)
 		for (i=0,pgd=ret;i<USER_PTRS_PER_PGD;i++,pgd++)
 			pmd_clear(pmd_offset(pgd,i*PGDIR_SIZE));
@@ -40,47 +40,80 @@
 
 extern __inline__ pgd_t* get_pgd_fast(void)
 {
-        unsigned long *ret;
+        unsigned long *ret = pgd_quicklist;
 	
-        if((ret = pgd_quicklist) != NULL) {
+        if (ret != NULL) {
                 pgd_quicklist = (unsigned long *)(*ret);
                 ret[0] = ret[1];
-                pgtable_cache_size--;
-		/*
-		 * Need to flush tlb, since private page tables
-		 * are unique thru address of pgd and virtual address.
-		 * If we reuse pgd we need to be sure no tlb entry
-		 * with that pdg is left -> global flush
-		 *
-		 * Fixme: To avoid this global flush we should
-		 * use pdg_quicklist as fix lenght fifo list
-		 * and not as stack
-		 */
-        } else
-                ret = (unsigned long *)get_pgd_slow();
+                pgtable_cache_size -= 2;
+        }
         return (pgd_t *)ret;
 }
 
+extern __inline__ pgd_t *pgd_alloc(void)
+{
+	pgd_t *pgd;
+
+	pgd = get_pgd_fast();
+	if (!pgd)
+		pgd = get_pgd_slow();
+	return pgd;
+}
+
 extern __inline__ void free_pgd_fast(pgd_t *pgd)
 {
         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
         pgd_quicklist = (unsigned long *) pgd;
-        pgtable_cache_size++;
+        pgtable_cache_size += 2;
 }
 
 extern __inline__ void free_pgd_slow(pgd_t *pgd)
 {
-        free_pages((unsigned long)pgd,2);
+        free_pages((unsigned long) pgd, 1);
+}
+
+#define pgd_free(pgd)           free_pgd_fast(pgd)
+
+/*
+ * page middle directory allocation/free routines.
+ * We don't use pmd cache, so these are dummy routines.
+ */
+extern __inline__ pmd_t *get_pmd_fast(void)
+{
+        return (pmd_t *)0;
+}
+
+extern __inline__ void free_pmd_fast(pmd_t *pmd)
+{
+}
+
+extern inline pmd_t * pmd_alloc(pgd_t * pgd, unsigned long address)
+{
+        return (pmd_t *) pgd;
+}
+
+extern __inline__ void free_pmd_slow(pmd_t *pmd)
+{
+}
+
+extern inline void pmd_free(pmd_t * pmd)
+{
 }
 
+#define pmd_free_kernel         pmd_free
+#define pmd_alloc_kernel        pmd_alloc
+
+/*
+ * page table entry allocation/free routines.
+ */
+extern pte_t empty_bad_pte_table[];
 extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
-extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted);
 
 extern __inline__ pte_t* get_pte_fast(void)
 {
-        unsigned long *ret;
+        unsigned long *ret = (unsigned long *) pte_quicklist;
 
-        if((ret = (unsigned long *)pte_quicklist) != NULL) {
+        if (ret != NULL) {
                 pte_quicklist = (unsigned long *)(*ret);
                 ret[0] = ret[1];
                 pgtable_cache_size--;
@@ -90,6 +123,8 @@
 
 extern __inline__ void free_pte_fast(pte_t *pte)
 {
+	if (pte == empty_bad_pte_table)
+		return;
         *(unsigned long *)pte = (unsigned long) pte_quicklist;
         pte_quicklist = (unsigned long *) pte;
         pgtable_cache_size++;
@@ -97,79 +132,41 @@
 
 extern __inline__ void free_pte_slow(pte_t *pte)
 {
-        free_page((unsigned long)pte);
-}
-
-#define pte_free_kernel(pte)    free_pte_fast(pte)
-#define pte_free(pte)           free_pte_fast(pte)
-#define pgd_free(pgd)           free_pgd_fast(pgd)
-#define pgd_alloc()             get_pgd_fast()
-
-extern inline pte_t * pte_alloc_kernel(pmd_t * pmd, unsigned long address)
-{
-        address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
-        if (pmd_none(*pmd)) {
-                pte_t * page = (pte_t *) get_pte_fast();
-
-                if (!page)
-                        return get_pte_kernel_slow(pmd, address);
-                pmd_val(pmd[0]) = _KERNPG_TABLE + __pa(page);
-                pmd_val(pmd[1]) = _KERNPG_TABLE + __pa(page+1024);
-                pmd_val(pmd[2]) = _KERNPG_TABLE + __pa(page+2048);
-                pmd_val(pmd[3]) = _KERNPG_TABLE + __pa(page+3072);
-                return page + address;
-        }
-        if (pmd_bad(*pmd)) {
-                __handle_bad_pmd_kernel(pmd);
-                return NULL;
-        }
-        return (pte_t *) pmd_page(*pmd) + address;
+        free_page((unsigned long) pte);
 }
 
-extern inline pte_t * pte_alloc(pmd_t * pmd, unsigned long address)
+extern inline pte_t * pte_alloc(pmd_t * pmd, unsigned long vmaddr)
 {
-        address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+	unsigned long offset;
 
-        if (pmd_none(*pmd))
-                goto getnew;
+	offset = (vmaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+        if (pmd_none(*pmd)) {
+		unsigned long page = (unsigned long) get_pte_fast();
+		
+		if (!page)
+			return get_pte_slow(pmd, offset);
+		pmd_val(pmd[0]) = _PAGE_TABLE + __pa(page);
+		pmd_val(pmd[1]) = _PAGE_TABLE + __pa(page+1024);
+		pmd_val(pmd[2]) = _PAGE_TABLE + __pa(page+2048);
+		pmd_val(pmd[3]) = _PAGE_TABLE + __pa(page+3072);
+		return (pte_t *) page + offset;
+	}
         if (pmd_bad(*pmd))
-                goto fix;
-        return (pte_t *) pmd_page(*pmd) + address;
-getnew:
-{
-        unsigned long page = (unsigned long) get_pte_fast();
-
-        if (!page)
-                return get_pte_slow(pmd, address);
-        pmd_val(pmd[0]) = _PAGE_TABLE + __pa(page);
-        pmd_val(pmd[1]) = _PAGE_TABLE + __pa(page+1024);
-        pmd_val(pmd[2]) = _PAGE_TABLE + __pa(page+2048);
-        pmd_val(pmd[3]) = _PAGE_TABLE + __pa(page+3072);
-        return (pte_t *) page + address;
-}
-fix:
-        __handle_bad_pmd(pmd);
-        return NULL;
+		BUG();
+        return (pte_t *) pmd_page(*pmd) + offset;
 }
 
-/*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
-extern inline void pmd_free(pmd_t * pmd)
-{
-}
-
-extern inline pmd_t * pmd_alloc(pgd_t * pgd, unsigned long address)
-{
-        return (pmd_t *) pgd;
-}
-
-#define pmd_free_kernel         pmd_free
-#define pmd_alloc_kernel        pmd_alloc
+#define pte_alloc_kernel(pmd, addr) pte_alloc(pmd, addr)
+#define pte_free_kernel(pte)    free_pte_fast(pte)
+#define pte_free(pte)           free_pte_fast(pte)
 
 extern int do_check_pgt_cache(int, int);
 
+/*
+ * This establishes kernel virtual mappings (e.g., as a result of a
+ * vmalloc call).  Since s390-esame uses a separate kernel page table,
+ * there is nothing to do here... :)
+ */
 #define set_pgdir(addr,entry) do { } while(0)
 
 /*
@@ -185,161 +182,122 @@
  */
 
 /*
- * s390 has two ways of flushing TLBs
+ * S/390 has three ways of flushing TLBs
  * 'ptlb' does a flush of the local processor
- * 'ipte' invalidates a pte in a page table and flushes that out of 
- * the TLBs of all PUs of a SMP 
+ * 'csp' flushes the TLBs on all PUs of a SMP
+ * 'ipte' invalidates a pte in a page table and flushes that out of
+ * the TLBs of all PUs of a SMP
  */
 
-#define __flush_tlb() \
+#define local_flush_tlb() \
 do {  __asm__ __volatile__("ptlb": : :"memory"); } while (0)
 
 
-static inline void __flush_global_tlb(void) 
-{
-	int cs1=0,dum=0;
-	int *adr;
-	long long dummy=0;
-	adr = (int*) (((int)(((int*) &dummy)+1) & 0xfffffffc)|1);
-	__asm__ __volatile__("lr    2,%0\n\t"
-			     "lr    3,%1\n\t"
-			     "lr    4,%2\n\t"
-			     ".long 0xb2500024" :
-			     : "d" (cs1), "d" (dum), "d" (adr)
-			     : "2", "3", "4");
-}
-
-#if 0
-#define flush_tlb_one(a,b)     __flush_tlb()
-#define __flush_tlb_one(a,b)   __flush_tlb()
-#else
-static inline void __flush_tlb_one(struct mm_struct *mm,
-                                   unsigned long addr)
-{
-	pgd_t * pgdir;
-	pmd_t * pmd;
-	pte_t * pte, *pto;
-	
-	pgdir = pgd_offset(mm, addr);
-	if (pgd_none(*pgdir) || pgd_bad(*pgdir))
-		return;
-	pmd = pmd_offset(pgdir, addr);
-	if (pmd_none(*pmd) || pmd_bad(*pmd))
-		return;
-	pte = pte_offset(pmd,addr);
-
-	/*
-	 * S390 has 1mb segments, we are emulating 4MB segments
-	 */
-
-	pto = (pte_t*) (((unsigned long) pte) & 0x7ffffc00);
-	       
-       	__asm__ __volatile("    ic   0,2(%0)\n"
-			   "    ipte %1,%2\n"
-			   "    stc  0,2(%0)"
-			   : : "a" (pte), "a" (pto), "a" (addr): "0");
-}
-#endif
-
-
 #ifndef CONFIG_SMP
 
-#define flush_tlb()       __flush_tlb()
-#define flush_tlb_all()   __flush_tlb()
-#define local_flush_tlb() __flush_tlb()
-
 /*
  * We always need to flush, since s390 does not flush tlb
  * on each context switch
  */
 
-
-static inline void flush_tlb_mm(struct mm_struct *mm)
-{
-        __flush_tlb();
-}
-
-static inline void flush_tlb_page(struct vm_area_struct *vma,
-        unsigned long addr)
-{
-        __flush_tlb_one(vma->vm_mm,addr);
-}
-
-static inline void flush_tlb_range(struct mm_struct *mm,
-        unsigned long start, unsigned long end)
-{
-        __flush_tlb();
-}
+#define flush_tlb()			local_flush_tlb()
+#define flush_tlb_all()			local_flush_tlb()
+#define flush_tlb_mm(mm)		local_flush_tlb()
+#define flush_tlb_page(vma, va)		local_flush_tlb()
+#define flush_tlb_range(mm, start, end)	local_flush_tlb()
 
 #else
 
-/*
- * We aren't very clever about this yet -  SMP could certainly
- * avoid some global flushes..
- */
-
 #include <asm/smp.h>
 
-#define local_flush_tlb() \
-        __flush_tlb()
+extern void smp_ptlb_all(void);
+static inline void global_flush_tlb_csp(void)
+{
+	int cs1=0,dum=0;
+	int *adr;
+	long long dummy=0;
+	adr = (int*) (((int)(((int*) &dummy)+1) & 0xfffffffc)|1);
+	__asm__ __volatile__("lr    2,%0\n\t"
+                             "lr    3,%1\n\t"
+                             "lr    4,%2\n\t"
+                             "csp   2,4" :
+                             : "d" (cs1), "d" (dum), "d" (adr)
+                             : "2", "3", "4");
+}
+static inline void global_flush_tlb(void)
+{
+	if (MACHINE_HAS_CSP)
+		global_flush_tlb_csp();
+	else
+		smp_ptlb_all();
+}
 
 /*
- *      We only have to do global flush of tlb if process run since last
- *      flush on any other pu than current. 
- *      If we have threads (mm->count > 1) we always do a global flush, 
- *      since the process runs on more than one processor at the same time.
+ * We only have to do global flush of tlb if process run since last
+ * flush on any other pu than current. 
+ * If we have threads (mm->count > 1) we always do a global flush, 
+ * since the process runs on more than one processor at the same time.
  */
 
-static inline void flush_tlb_current_task(void)
+static inline void __flush_tlb_mm(struct mm_struct * mm)
 {
-	if ((atomic_read(&current->mm->mm_count) != 1) ||
-	    (current->mm->cpu_vm_mask != (1UL << smp_processor_id()))) {
-		current->mm->cpu_vm_mask = (1UL << smp_processor_id());
-		__flush_global_tlb();
+	if ((smp_num_cpus > 1) &&
+	    ((atomic_read(&mm->mm_count) != 1) ||
+	     (mm->cpu_vm_mask != (1UL << smp_processor_id())))) {
+		mm->cpu_vm_mask = (1UL << smp_processor_id());
+		global_flush_tlb();
 	} else {                 
 		local_flush_tlb();
 	}
 }
 
-#define flush_tlb() flush_tlb_current_task()
+#define flush_tlb()			__flush_tlb_mm(current->mm)
+#define flush_tlb_all()			global_flush_tlb()
+#define flush_tlb_mm(mm)		__flush_tlb_mm(mm)
+#define flush_tlb_page(vma, va)		__flush_tlb_mm((vma)->vm_mm)
+#define flush_tlb_range(mm, start, end)	__flush_tlb_mm(mm)
 
-#define flush_tlb_all() __flush_global_tlb()
+#endif
 
-static inline void flush_tlb_mm(struct mm_struct * mm)
+extern inline void flush_tlb_pgtables(struct mm_struct *mm,
+                                      unsigned long start, unsigned long end)
 {
-	if ((atomic_read(&mm->mm_count) != 1) ||
-	    (mm->cpu_vm_mask != (1UL << smp_processor_id()))) {
-		mm->cpu_vm_mask = (1UL << smp_processor_id());
-		__flush_global_tlb();
-	} else {                 
-		local_flush_tlb();
-	}
+        /* S/390 does not keep any page table caches in TLB */
 }
 
-static inline void flush_tlb_page(struct vm_area_struct * vma,
-        unsigned long va)
+
+static inline int ptep_test_and_clear_and_flush_young(struct vm_area_struct *vma, 
+                                                      unsigned long address, pte_t *ptep)
 {
-	__flush_tlb_one(vma->vm_mm,va);
+	/* No need to flush TLB; bits are in storage key */
+	return ptep_test_and_clear_young(ptep);
 }
 
-static inline void flush_tlb_range(struct mm_struct * mm,
-				   unsigned long start, unsigned long end)
+static inline int ptep_test_and_clear_and_flush_dirty(struct vm_area_struct *vma, 
+                                                      unsigned long address, pte_t *ptep)
 {
-	if ((atomic_read(&mm->mm_count) != 1) ||
-	    (mm->cpu_vm_mask != (1UL << smp_processor_id()))) {
-		mm->cpu_vm_mask = (1UL << smp_processor_id());
-		__flush_global_tlb();
-	} else {                 
-		local_flush_tlb();
-	}
+	/* No need to flush TLB; bits are in storage key */
+	return ptep_test_and_clear_dirty(ptep);
 }
 
-#endif
+static inline pte_t ptep_invalidate(struct vm_area_struct *vma, 
+                                    unsigned long address, pte_t *ptep)
+{
+	pte_t pte = *ptep;
+	if (!(pte_val(pte) & _PAGE_INVALID)) {
+		/* S390 has 1mb segments, we are emulating 4MB segments */
+		pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00);
+		__asm__ __volatile__ ("ipte %0,%1" : : "a" (pto), "a" (address));
+	}
+	pte_clear(ptep);
+	return pte;
+}
 
-extern inline void flush_tlb_pgtables(struct mm_struct *mm,
-                                      unsigned long start, unsigned long end)
+static inline void ptep_establish(struct vm_area_struct *vma, 
+                                  unsigned long address, pte_t *ptep, pte_t entry)
 {
-        /* S/390 does not keep any page table caches in TLB */
+	ptep_invalidate(vma, address, ptep);
+	set_pte(ptep, entry);
 }
 
 #endif /* _S390_PGALLOC_H */