Merge branch 'master' into upstream

[pandora-kernel.git] / arch / i386 / mm / pgtable.c

diff --git a/arch/i386/mm/pgtable.c b/arch/i386/mm/pgtable.c
index 2889567..fa0cfbd 100644 (file)
--- a/arch/i386/mm/pgtable.c
+++ b/arch/i386/mm/pgtable.c
@@ -2,7 +2,6 @@
  *  linux/arch/i386/mm/pgtable.c
  */
 
-#include <linux/config.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -13,6 +12,7 @@
 #include <linux/slab.h>
 #include <linux/pagemap.h>
 #include <linux/spinlock.h>
+#include <linux/module.h>
 
 #include <asm/system.h>
 #include <asm/pgtable.h>
@@ -30,7 +30,6 @@ void show_mem(void)
        struct page *page;
        pg_data_t *pgdat;
        unsigned long i;
-       struct page_state ps;
        unsigned long flags;
 
        printk(KERN_INFO "Mem-info:\n");
@@ -58,12 +57,15 @@ void show_mem(void)
        printk(KERN_INFO "%d pages shared\n", shared);
        printk(KERN_INFO "%d pages swap cached\n", cached);
 
-       get_page_state(&ps);
-       printk(KERN_INFO "%lu pages dirty\n", ps.nr_dirty);
-       printk(KERN_INFO "%lu pages writeback\n", ps.nr_writeback);
-       printk(KERN_INFO "%lu pages mapped\n", ps.nr_mapped);
-       printk(KERN_INFO "%lu pages slab\n", ps.nr_slab);
-       printk(KERN_INFO "%lu pages pagetables\n", ps.nr_page_table_pages);
+       printk(KERN_INFO "%lu pages dirty\n", global_page_state(NR_FILE_DIRTY));
+       printk(KERN_INFO "%lu pages writeback\n",
+                                       global_page_state(NR_WRITEBACK));
+       printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
+       printk(KERN_INFO "%lu pages slab\n",
+               global_page_state(NR_SLAB_RECLAIMABLE) +
+               global_page_state(NR_SLAB_UNRECLAIMABLE));
+       printk(KERN_INFO "%lu pages pagetables\n",
+                                       global_page_state(NR_PAGETABLE));
 }
 
 /*
@@ -93,8 +95,11 @@ static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
                return;
        }
        pte = pte_offset_kernel(pmd, vaddr);
-       /* <pfn,flags> stored as-is, to permit clearing entries */
-       set_pte(pte, pfn_pte(pfn, flags));
+       if (pgprot_val(flags))
+               /* <pfn,flags> stored as-is, to permit clearing entries */
+               set_pte(pte, pfn_pte(pfn, flags));
+       else
+               pte_clear(&init_mm, vaddr, pte);
 
        /*
         * It's enough to flush this one mapping.
@@ -138,6 +143,12 @@ void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
        __flush_tlb_one(vaddr);
 }
 
+static int fixmaps;
+#ifndef CONFIG_COMPAT_VDSO
+unsigned long __FIXADDR_TOP = 0xfffff000;
+EXPORT_SYMBOL(__FIXADDR_TOP);
+#endif
+
 void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
 {
        unsigned long address = __fix_to_virt(idx);
@@ -147,6 +158,27 @@ void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
                return;
        }
        set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
+       fixmaps++;
+}
+
+/**
+ * reserve_top_address - reserves a hole in the top of kernel address space
+ * @reserve - size of hole to reserve
+ *
+ * Can be used to relocate the fixmap area and poke a hole in the top
+ * of kernel address space to make room for a hypervisor.
+ */
+void reserve_top_address(unsigned long reserve)
+{
+       BUG_ON(fixmaps > 0);
+       printk(KERN_INFO "Reserving virtual address space above 0x%08x\n",
+              (int)-reserve);
+#ifdef CONFIG_COMPAT_VDSO
+       BUG_ON(reserve != 0);
+#else
+       __FIXADDR_TOP = -reserve - PAGE_SIZE;
+       __VMALLOC_RESERVE += reserve;
+#endif
 }
 
 pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
@@ -166,7 +198,7 @@ struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
        return pte;
 }
 
-void pmd_ctor(void *pmd, kmem_cache_t *cache, unsigned long flags)
+void pmd_ctor(void *pmd, struct kmem_cache *cache, unsigned long flags)
 {
        memset(pmd, 0, PTRS_PER_PMD*sizeof(pmd_t));
 }
@@ -206,7 +238,7 @@ static inline void pgd_list_del(pgd_t *pgd)
                set_page_private(next, (unsigned long)pprev);
 }
 
-void pgd_ctor(void *pgd, kmem_cache_t *cache, unsigned long unused)
+void pgd_ctor(void *pgd, struct kmem_cache *cache, unsigned long unused)
 {
        unsigned long flags;
 
@@ -218,18 +250,25 @@ void pgd_ctor(void *pgd, kmem_cache_t *cache, unsigned long unused)
        clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD,
                        swapper_pg_dir + USER_PTRS_PER_PGD,
                        KERNEL_PGD_PTRS);
+
        if (PTRS_PER_PMD > 1)
                return;
 
+       /* must happen under lock */
+       paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT,
+                       __pa(swapper_pg_dir) >> PAGE_SHIFT,
+                       USER_PTRS_PER_PGD, PTRS_PER_PGD - USER_PTRS_PER_PGD);
+
        pgd_list_add(pgd);
        spin_unlock_irqrestore(&pgd_lock, flags);
 }
 
 /* never called when PTRS_PER_PMD > 1 */
-void pgd_dtor(void *pgd, kmem_cache_t *cache, unsigned long unused)
+void pgd_dtor(void *pgd, struct kmem_cache *cache, unsigned long unused)
 {
        unsigned long flags; /* can be called from interrupt context */
 
+       paravirt_release_pd(__pa(pgd) >> PAGE_SHIFT);
        spin_lock_irqsave(&pgd_lock, flags);
        pgd_list_del(pgd);
        spin_unlock_irqrestore(&pgd_lock, flags);
@@ -247,13 +286,18 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
                pmd_t *pmd = kmem_cache_alloc(pmd_cache, GFP_KERNEL);
                if (!pmd)
                        goto out_oom;
+               paravirt_alloc_pd(__pa(pmd) >> PAGE_SHIFT);
                set_pgd(&pgd[i], __pgd(1 + __pa(pmd)));
        }
        return pgd;
 
 out_oom:
-       for (i--; i >= 0; i--)
-               kmem_cache_free(pmd_cache, (void *)__va(pgd_val(pgd[i])-1));
+       for (i--; i >= 0; i--) {
+               pgd_t pgdent = pgd[i];
+               void* pmd = (void *)__va(pgd_val(pgdent)-1);
+               paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
+               kmem_cache_free(pmd_cache, pmd);
+       }
        kmem_cache_free(pgd_cache, pgd);
        return NULL;
 }
@@ -264,8 +308,12 @@ void pgd_free(pgd_t *pgd)
 
        /* in the PAE case user pgd entries are overwritten before usage */
        if (PTRS_PER_PMD > 1)
-               for (i = 0; i < USER_PTRS_PER_PGD; ++i)
-                       kmem_cache_free(pmd_cache, (void *)__va(pgd_val(pgd[i])-1));
+               for (i = 0; i < USER_PTRS_PER_PGD; ++i) {
+                       pgd_t pgdent = pgd[i];
+                       void* pmd = (void *)__va(pgd_val(pgdent)-1);
+                       paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
+                       kmem_cache_free(pmd_cache, pmd);
+               }
        /* in the non-PAE case, free_pgtables() clears user pgd entries */
        kmem_cache_free(pgd_cache, pgd);
 }