powerpc/mm/book3s/radix: Add mapping statistics

Add statistics that show how memory is mapped within the kernel linear mapping.
This is similar to commit 37cd944c8d8f ("s390/pgtable: add mapping statistics")

We don't do this with Hash translation mode. Hash uses one size (mmu_linear_psize)
to map the kernel linear mapping and we print the linear psize during boot as
below.

"Page orders: linear mapping = 24, virtual = 16, io = 16, vmemmap = 24"

A sample output looks like:

DirectMap4k:           0 kB
DirectMap64k:       18432 kB
DirectMap2M:     1030144 kB
DirectMap1G:    11534336 kB

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h
index 76234a1..391ed2c 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/pgalloc.h
+++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h
@@ -227,4 +227,11 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 
 #define check_pgt_cache()      do { } while (0)
 
+extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
+static inline void update_page_count(int psize, long count)
+{
+       if (IS_ENABLED(CONFIG_PROC_FS))
+               atomic_long_add(count, &direct_pages_count[psize]);
+}
+
 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */

diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index 77440e8..7d1a3d1 100644 (file)
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -32,6 +32,9 @@
 #define RADIX_PUD_BAD_BITS             0x60000000000000e0UL
 #define RADIX_PGD_BAD_BITS             0x60000000000000e0UL
 
+#define RADIX_PMD_SHIFT                (PAGE_SHIFT + RADIX_PTE_INDEX_SIZE)
+#define RADIX_PUD_SHIFT                (RADIX_PMD_SHIFT + RADIX_PMD_INDEX_SIZE)
+#define RADIX_PGD_SHIFT                (RADIX_PUD_SHIFT + RADIX_PUD_INDEX_SIZE)
 /*
  * Size of EA range mapped by our pagetables.
  */

diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c
index 78d0b3d..01d7c0f 100644 (file)
--- a/arch/powerpc/mm/pgtable-book3s64.c
+++ b/arch/powerpc/mm/pgtable-book3s64.c
@@ -455,3 +455,25 @@ void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int index)
        return pgtable_free(table, index);
 }
 #endif
+
+#ifdef CONFIG_PROC_FS
+atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
+
+void arch_report_meminfo(struct seq_file *m)
+{
+       /*
+        * Hash maps the memory with one size mmu_linear_psize.
+        * So don't bother to print these on hash
+        */
+       if (!radix_enabled())
+               return;
+       seq_printf(m, "DirectMap4k:    %8lu kB\n",
+                  atomic_long_read(&direct_pages_count[MMU_PAGE_4K]) << 2);
+       seq_printf(m, "DirectMap64k:    %8lu kB\n",
+                  atomic_long_read(&direct_pages_count[MMU_PAGE_64K]) << 6);
+       seq_printf(m, "DirectMap2M:    %8lu kB\n",
+                  atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11);
+       seq_printf(m, "DirectMap1G:    %8lu kB\n",
+                  atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20);
+}
+#endif /* CONFIG_PROC_FS */

diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index bba168d..7be99fd 100644 (file)
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -267,6 +267,7 @@ static int __meminit create_physical_mapping(unsigned long start,
 #else
        int split_text_mapping = 0;
 #endif
+       int psize;
 
        start = _ALIGN_UP(start, PAGE_SIZE);
        for (addr = start; addr < end; addr += mapping_size) {
@@ -280,13 +281,17 @@ static int __meminit create_physical_mapping(unsigned long start,
 retry:
                if (IS_ALIGNED(addr, PUD_SIZE) && gap >= PUD_SIZE &&
                    mmu_psize_defs[MMU_PAGE_1G].shift &&
-                   PUD_SIZE <= max_mapping_size)
+                   PUD_SIZE <= max_mapping_size) {
                        mapping_size = PUD_SIZE;
-               else if (IS_ALIGNED(addr, PMD_SIZE) && gap >= PMD_SIZE &&
-                        mmu_psize_defs[MMU_PAGE_2M].shift)
+                       psize = MMU_PAGE_1G;
+               } else if (IS_ALIGNED(addr, PMD_SIZE) && gap >= PMD_SIZE &&
+                          mmu_psize_defs[MMU_PAGE_2M].shift) {
                        mapping_size = PMD_SIZE;
-               else
+                       psize = MMU_PAGE_2M;
+               } else {
                        mapping_size = PAGE_SIZE;
+                       psize = mmu_virtual_psize;
+               }
 
                if (split_text_mapping && (mapping_size == PUD_SIZE) &&
                        (addr <= __pa_symbol(__init_begin)) &&
@@ -297,8 +302,10 @@ retry:
 
                if (split_text_mapping && (mapping_size == PMD_SIZE) &&
                    (addr <= __pa_symbol(__init_begin)) &&
-                   (addr + mapping_size) >= __pa_symbol(_stext))
+                   (addr + mapping_size) >= __pa_symbol(_stext)) {
                        mapping_size = PAGE_SIZE;
+                       psize = mmu_virtual_psize;
+               }
 
                if (mapping_size != previous_size) {
                        print_mapping(start, addr, previous_size);
@@ -316,6 +323,8 @@ retry:
                rc = __map_kernel_page(vaddr, addr, prot, mapping_size, nid, start, end);
                if (rc)
                        return rc;
+
+               update_page_count(psize, 1);
        }
 
        print_mapping(start, addr, mapping_size);