5 files changed, 57 insertions, 0 deletions

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index ec30d10154b6..0269ac230bfa 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -162,6 +162,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
         pgd_t *pgd;
         pmd_t *pmd;
         pte_t *pte;
+        unsigned pages_2m = 0, pages_4k = 0;
 
         pgd_idx = pgd_index(PAGE_OFFSET);
         pgd = pgd_base + pgd_idx;
@@ -197,6 +198,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
                                     is_kernel_text(addr2))
                                         prot = PAGE_KERNEL_LARGE_EXEC;
 
+                                pages_2m++;
                                 set_pmd(pmd, pfn_pmd(pfn, prot));
 
                                 pfn += PTRS_PER_PTE;
@@ -213,11 +215,14 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
                                 if (is_kernel_text(addr))
                                         prot = PAGE_KERNEL_EXEC;
 
+                                pages_4k++;
                                 set_pte(pte, pfn_pte(pfn, prot));
                         }
                         max_pfn_mapped = pfn;
                 }
         }
+        update_page_count(PG_LEVEL_2M, pages_2m);
+        update_page_count(PG_LEVEL_4K, pages_4k);
 }
 
 static inline int page_kills_ppro(unsigned long pagenr)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 819dad973b13..5e4383859053 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -312,6 +312,8 @@ __meminit void early_iounmap(void *addr, unsigned long size)
 static unsigned long __meminit
 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
 {
+        unsigned long pages = 0;
+
         int i = pmd_index(address);
 
         for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
@@ -328,9 +330,11 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
                 if (pmd_val(*pmd))
                         continue;
 
+                pages++;
                 set_pte((pte_t *)pmd,
                         pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
         }
+        update_page_count(PG_LEVEL_2M, pages);
         return address;
 }
 
@@ -350,6 +354,7 @@ phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
 static unsigned long __meminit
 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
 {
+        unsigned long pages = 0;
         unsigned long last_map_addr = end;
         int i = pud_index(addr);
 
@@ -374,6 +379,7 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
                 }
 
                 if (direct_gbpages) {
+                        pages++;
                         set_pte((pte_t *)pud,
                                 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
                         last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
@@ -390,6 +396,7 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
                 unmap_low_page(pmd);
         }
         __flush_tlb_all();
+        update_page_count(PG_LEVEL_1G, pages);
 
         return last_map_addr >> PAGE_SHIFT;
 }
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 60bcb5b6a37e..668205bca15e 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -34,6 +34,19 @@ struct cpa_data {
         unsigned        force_split : 1;
 };
 
+static unsigned long direct_pages_count[PG_LEVEL_NUM];
+
+void __meminit update_page_count(int level, unsigned long pages)
+{
+#ifdef CONFIG_PROC_FS
+        unsigned long flags;
+        /* Protect against CPA */
+        spin_lock_irqsave(&pgd_lock, flags);
+        direct_pages_count[level] += pages;
+        spin_unlock_irqrestore(&pgd_lock, flags);
+#endif
+}
+
 #ifdef CONFIG_X86_64
 
 static inline unsigned long highmap_start_pfn(void)
@@ -500,6 +513,12 @@ static int split_large_page(pte_t *kpte, unsigned long address)
         for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc)
                 set_pte(&pbase[i], pfn_pte(pfn, ref_prot));
 
+        if (address >= (unsigned long)__va(0) &&
+                address < (unsigned long)__va(max_pfn_mapped << PAGE_SHIFT)) {
+                direct_pages_count[level]--;
+                direct_pages_count[level - 1] += PTRS_PER_PTE;
+        }
+
         /*
          * Install the new, split up pagetable. Important details here:
          *
@@ -1029,6 +1048,22 @@ bool kernel_page_present(struct page *page)
 
 #endif /* CONFIG_DEBUG_PAGEALLOC */
 
+#ifdef CONFIG_PROC_FS
+int arch_report_meminfo(char *page)
+{
+        int n;
+        n = sprintf(page, "DirectMap4k:  %8lu\n"
+                          "DirectMap2M:  %8lu\n",
+                        direct_pages_count[PG_LEVEL_4K],
+                        direct_pages_count[PG_LEVEL_2M]);
+#ifdef CONFIG_X86_64
+        n += sprintf(page + n, "DirectMap1G:  %8lu\n",
+                        direct_pages_count[PG_LEVEL_1G]);
+#endif
+        return n;
+}
+#endif
+
 /*
  * The testcases use internal knowledge of the implementation that shouldn't
  * be exposed to the rest of the kernel. Include these directly here.
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 7e277f2ad466..15f7bd41029b 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -123,6 +123,11 @@ static int uptime_read_proc(char *page, char **start, off_t off,
         return proc_calc_metrics(page, start, off, count, eof, len);
 }
 
+int __attribute__((weak)) arch_report_meminfo(char *page)
+{
+        return 0;
+}
+
 static int meminfo_read_proc(char *page, char **start, off_t off,
                                  int count, int *eof, void *data)
 {
@@ -221,6 +226,8 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
 
                 len += hugetlb_report_meminfo(page + len);
 
+        len += arch_report_meminfo(page + len);
+
         return proc_calc_metrics(page, start, off, count, eof, len);
 #undef K
 }
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index 97c271b2910b..111564fa5e70 100644
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -369,8 +369,11 @@ enum {
         PG_LEVEL_4K,
         PG_LEVEL_2M,
         PG_LEVEL_1G,
+        PG_LEVEL_NUM
 };
 
+void update_page_count(int level, unsigned long pages);
+
 /*
  * Helper function that returns the kernel pagetable entry controlling
  * the virtual address 'address'. NULL means no pagetable entry present.