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authorDavid S. Miller <davem@davemloft.net>2014-09-24 21:20:14 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-10-30 09:43:18 -0700
commit1bbd6776e3957b0a9f8006e2d38a71149f705ca6 (patch)
tree8c400a306b25d216815d501e121aa7fc302867aa
parent92566c44de4e7373ffa0c42b73bfefd921171531 (diff)
downloadlinux-linaro-stable-1bbd6776e3957b0a9f8006e2d38a71149f705ca6.tar.gz
sparc64: Use kernel page tables for vmemmap.
[ Upstream commit c06240c7f5c39c83dfd7849c0770775562441b96 ] For sparse memory configurations, the vmemmap array behaves terribly and it takes up an inordinate amount of space in the BSS section of the kernel image unconditionally. Just build huge PMDs and look them up just like we do for TLB misses in the vmalloc area. Kernel BSS shrinks by about 2MB. Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Bob Picco <bob.picco@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/sparc/kernel/ktlb.S9
-rw-r--r--arch/sparc/mm/init_64.c72
-rw-r--r--arch/sparc/mm/init_64.h11
3 files changed, 36 insertions, 56 deletions
diff --git a/arch/sparc/kernel/ktlb.S b/arch/sparc/kernel/ktlb.S
index 94a1e6648bd0..2627a7fa33d9 100644
--- a/arch/sparc/kernel/ktlb.S
+++ b/arch/sparc/kernel/ktlb.S
@@ -186,13 +186,8 @@ kvmap_dtlb_load:
#ifdef CONFIG_SPARSEMEM_VMEMMAP
kvmap_vmemmap:
- sub %g4, %g5, %g5
- srlx %g5, ILOG2_4MB, %g5
- sethi %hi(vmemmap_table), %g1
- sllx %g5, 3, %g5
- or %g1, %lo(vmemmap_table), %g1
- ba,pt %xcc, kvmap_dtlb_load
- ldx [%g1 + %g5], %g5
+ KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_dtlb_longpath)
+ ba,a,pt %xcc, kvmap_dtlb_load
#endif
kvmap_dtlb_nonlinear:
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index 78f3704b0a07..bd583b07d1dd 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2261,18 +2261,9 @@ unsigned long _PAGE_CACHE __read_mostly;
EXPORT_SYMBOL(_PAGE_CACHE);
#ifdef CONFIG_SPARSEMEM_VMEMMAP
-unsigned long vmemmap_table[VMEMMAP_SIZE];
-
-static long __meminitdata addr_start, addr_end;
-static int __meminitdata node_start;
-
int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
int node)
{
- unsigned long phys_start = (vstart - VMEMMAP_BASE);
- unsigned long phys_end = (vend - VMEMMAP_BASE);
- unsigned long addr = phys_start & VMEMMAP_CHUNK_MASK;
- unsigned long end = VMEMMAP_ALIGN(phys_end);
unsigned long pte_base;
pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4U |
@@ -2283,47 +2274,52 @@ int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
_PAGE_CP_4V | _PAGE_CV_4V |
_PAGE_P_4V | _PAGE_W_4V);
- for (; addr < end; addr += VMEMMAP_CHUNK) {
- unsigned long *vmem_pp =
- vmemmap_table + (addr >> VMEMMAP_CHUNK_SHIFT);
- void *block;
+ pte_base |= _PAGE_PMD_HUGE;
- if (!(*vmem_pp & _PAGE_VALID)) {
- block = vmemmap_alloc_block(1UL << ILOG2_4MB, node);
- if (!block)
+ vstart = vstart & PMD_MASK;
+ vend = ALIGN(vend, PMD_SIZE);
+ for (; vstart < vend; vstart += PMD_SIZE) {
+ pgd_t *pgd = pgd_offset_k(vstart);
+ unsigned long pte;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ if (pgd_none(*pgd)) {
+ pud_t *new = vmemmap_alloc_block(PAGE_SIZE, node);
+
+ if (!new)
return -ENOMEM;
+ pgd_populate(&init_mm, pgd, new);
+ }
- *vmem_pp = pte_base | __pa(block);
+ pud = pud_offset(pgd, vstart);
+ if (pud_none(*pud)) {
+ pmd_t *new = vmemmap_alloc_block(PAGE_SIZE, node);
- /* check to see if we have contiguous blocks */
- if (addr_end != addr || node_start != node) {
- if (addr_start)
- printk(KERN_DEBUG " [%lx-%lx] on node %d\n",
- addr_start, addr_end-1, node_start);
- addr_start = addr;
- node_start = node;
- }
- addr_end = addr + VMEMMAP_CHUNK;
+ if (!new)
+ return -ENOMEM;
+ pud_populate(&init_mm, pud, new);
}
- }
- return 0;
-}
-void __meminit vmemmap_populate_print_last(void)
-{
- if (addr_start) {
- printk(KERN_DEBUG " [%lx-%lx] on node %d\n",
- addr_start, addr_end-1, node_start);
- addr_start = 0;
- addr_end = 0;
- node_start = 0;
+ pmd = pmd_offset(pud, vstart);
+
+ pte = pmd_val(*pmd);
+ if (!(pte & _PAGE_VALID)) {
+ void *block = vmemmap_alloc_block(PMD_SIZE, node);
+
+ if (!block)
+ return -ENOMEM;
+
+ pmd_val(*pmd) = pte_base | __pa(block);
+ }
}
+
+ return 0;
}
void vmemmap_free(unsigned long start, unsigned long end)
{
}
-
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
static void prot_init_common(unsigned long page_none,
diff --git a/arch/sparc/mm/init_64.h b/arch/sparc/mm/init_64.h
index 29ff73fc96b4..a4c09603b05c 100644
--- a/arch/sparc/mm/init_64.h
+++ b/arch/sparc/mm/init_64.h
@@ -31,15 +31,4 @@ extern unsigned long kern_locked_tte_data;
void prom_world(int enter);
-#ifdef CONFIG_SPARSEMEM_VMEMMAP
-#define VMEMMAP_CHUNK_SHIFT 22
-#define VMEMMAP_CHUNK (1UL << VMEMMAP_CHUNK_SHIFT)
-#define VMEMMAP_CHUNK_MASK ~(VMEMMAP_CHUNK - 1UL)
-#define VMEMMAP_ALIGN(x) (((x)+VMEMMAP_CHUNK-1UL)&VMEMMAP_CHUNK_MASK)
-
-#define VMEMMAP_SIZE ((((1UL << MAX_PHYSADDR_BITS) >> PAGE_SHIFT) * \
- sizeof(struct page)) >> VMEMMAP_CHUNK_SHIFT)
-extern unsigned long vmemmap_table[VMEMMAP_SIZE];
-#endif
-
#endif /* _SPARC64_MM_INIT_H */