From 46644c2477c58906e95281636d04e9cc42b39352 Mon Sep 17 00:00:00 2001 From: David Miller Date: Tue, 16 Oct 2007 01:24:16 -0700 Subject: [PATCH] SPARC64: SPARSEMEM_VMEMMAP support [apw@shadowen.org: style fixups] [apw@shadowen.org: vmemmap sparc64: convert to new config options] Signed-off-by: Andy Whitcroft Acked-by: Mel Gorman Acked-by: Christoph Lameter Cc: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/sparc64/Kconfig | 2 +- arch/sparc64/kernel/ktlb.S | 16 +++++++++++ arch/sparc64/mm/init.c | 52 +++++++++++++++++++++++++++++++++++ include/asm-sparc64/pgtable.h | 3 ++ 4 files changed, 72 insertions(+), 1 deletion(-) diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig index 33dabf588b..2f22fa9046 100644 --- a/arch/sparc64/Kconfig +++ b/arch/sparc64/Kconfig @@ -240,10 +240,10 @@ config ARCH_SELECT_MEMORY_MODEL config ARCH_SPARSEMEM_ENABLE def_bool y + select SPARSEMEM_VMEMMAP_ENABLE config ARCH_SPARSEMEM_DEFAULT def_bool y - select SPARSEMEM_STATIC source "mm/Kconfig" diff --git a/arch/sparc64/kernel/ktlb.S b/arch/sparc64/kernel/ktlb.S index d4024ac0d6..964527d2ff 100644 --- a/arch/sparc64/kernel/ktlb.S +++ b/arch/sparc64/kernel/ktlb.S @@ -226,6 +226,15 @@ kvmap_dtlb_load: ba,pt %xcc, sun4v_dtlb_load mov %g5, %g3 +kvmap_vmemmap: + sub %g4, %g5, %g5 + srlx %g5, 22, %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 + kvmap_dtlb_nonlinear: /* Catch kernel NULL pointer derefs. */ sethi %hi(PAGE_SIZE), %g5 @@ -233,6 +242,13 @@ kvmap_dtlb_nonlinear: bleu,pn %xcc, kvmap_dtlb_longpath nop + /* Do not use the TSB for vmemmap. */ + mov (VMEMMAP_BASE >> 24), %g5 + sllx %g5, 24, %g5 + cmp %g4,%g5 + bgeu,pn %xcc, kvmap_vmemmap + nop + KERN_TSB_LOOKUP_TL1(%g4, %g6, %g5, %g1, %g2, %g3, kvmap_dtlb_load) kvmap_dtlb_tsbmiss: diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c index f0ab9aab30..69538d1aa0 100644 --- a/arch/sparc64/mm/init.c +++ b/arch/sparc64/mm/init.c @@ -1645,6 +1645,58 @@ EXPORT_SYMBOL(_PAGE_E); unsigned long _PAGE_CACHE __read_mostly; EXPORT_SYMBOL(_PAGE_CACHE); +#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) +unsigned long vmemmap_table[VMEMMAP_SIZE]; + +int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node) +{ + unsigned long vstart = (unsigned long) start; + unsigned long vend = (unsigned long) (start + nr); + 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 | + _PAGE_CP_4U | _PAGE_CV_4U | + _PAGE_P_4U | _PAGE_W_4U); + if (tlb_type == hypervisor) + pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4V | + _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; + + if (!(*vmem_pp & _PAGE_VALID)) { + block = vmemmap_alloc_block(1UL << 22, node); + if (!block) + return -ENOMEM; + + *vmem_pp = pte_base | __pa(block); + + printk(KERN_INFO "[%p-%p] page_structs=%lu " + "node=%d entry=%lu/%lu\n", start, block, nr, + node, + addr >> VMEMMAP_CHUNK_SHIFT, + VMEMMAP_SIZE >> VMEMMAP_CHUNK_SHIFT); + } + } + return 0; +} +#endif /* CONFIG_SPARSEMEM_VMEMMAP */ + static void prot_init_common(unsigned long page_none, unsigned long page_shared, unsigned long page_copy, diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h index 0393380d75..3167ccff64 100644 --- a/include/asm-sparc64/pgtable.h +++ b/include/asm-sparc64/pgtable.h @@ -42,6 +42,9 @@ #define HI_OBP_ADDRESS _AC(0x0000000100000000,UL) #define VMALLOC_START _AC(0x0000000100000000,UL) #define VMALLOC_END _AC(0x0000000200000000,UL) +#define VMEMMAP_BASE _AC(0x0000000200000000,UL) + +#define vmemmap ((struct page *)VMEMMAP_BASE) /* XXX All of this needs to be rethought so we can take advantage * XXX cheetah's full 64-bit virtual address space, ie. no more hole -- 2.39.5