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Subject[4/6] sparsemem memory model for i386
From
Date
Provide the architecture specific implementation for SPARSEMEM for
i386 SMP and NUMA systems.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
---
arch/i386/Kconfig | 24 ++++++++---
arch/i386/kernel/setup.c | 8 ++-
arch/i386/mm/Makefile | 2
arch/i386/mm/discontig.c | 36 +++++++++--------
arch/i386/mm/init.c | 18 ++++----
include/asm-i386/mmzone.h | 89 +++++++++++++++++++++++--------------------
include/asm-i386/page.h | 4 -
include/asm-i386/pgtable.h | 4 -
include/asm-i386/sparsemem.h | 31 ++++++++++++++
9 files changed, 135 insertions(+), 81 deletions(-)
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/i386/Kconfig current/arch/i386/Kconfig
--- reference/arch/i386/Kconfig 2005-05-04 20:54:29.000000000 +0100
+++ current/arch/i386/Kconfig 2005-05-04 20:54:34.000000000 +0100
@@ -68,7 +68,6 @@ config X86_VOYAGER

config X86_NUMAQ
bool "NUMAQ (IBM/Sequent)"
- select DISCONTIGMEM
select NUMA
help
This option is used for getting Linux to run on a (IBM/Sequent) NUMA
@@ -767,11 +766,6 @@ comment "NUMA (NUMA-Q) requires SMP, 64G
comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)

-config ARCH_DISCONTIGMEM_ENABLE
- bool
- depends on NUMA
- default y
-
config HAVE_ARCH_BOOTMEM_NODE
bool
depends on NUMA
@@ -784,7 +778,7 @@ config ARCH_HAVE_MEMORY_PRESENT

config NEED_NODE_MEMMAP_SIZE
bool
- depends on DISCONTIGMEM
+ depends on DISCONTIGMEM || SPARSEMEM
default y

config HAVE_ARCH_ALLOC_REMAP
@@ -792,6 +786,22 @@ config HAVE_ARCH_ALLOC_REMAP
depends on NUMA
default y

+config ARCH_DISCONTIGMEM_ENABLE
+ def_bool y
+ depends on NUMA
+
+config ARCH_DISCONTIGMEM_DEFAULT
+ def_bool y
+ depends on NUMA
+
+config ARCH_SPARSEMEM_ENABLE
+ def_bool y
+ depends on NUMA
+
+config SELECT_MEMORY_MODEL
+ def_bool y
+ depends on ARCH_SPARSEMEM_ENABLE
+
source "mm/Kconfig"

config HAVE_ARCH_EARLY_PFN_TO_NID
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/i386/kernel/setup.c current/arch/i386/kernel/setup.c
--- reference/arch/i386/kernel/setup.c 2005-04-11 19:33:08.000000000 +0100
+++ current/arch/i386/kernel/setup.c 2005-05-04 20:54:35.000000000 +0100
@@ -25,6 +25,7 @@

#include <linux/sched.h>
#include <linux/mm.h>
+#include <linux/mmzone.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
@@ -1022,7 +1023,7 @@ static void __init reserve_ebda_region(v
reserve_bootmem(addr, PAGE_SIZE);
}

-#ifndef CONFIG_DISCONTIGMEM
+#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init setup_bootmem_allocator(void);
static unsigned long __init setup_memory(void)
{
@@ -1072,9 +1073,9 @@ void __init zone_sizes_init(void)
free_area_init(zones_size);
}
#else
-extern unsigned long setup_memory(void);
+extern unsigned long __init setup_memory(void);
extern void zone_sizes_init(void);
-#endif /* !CONFIG_DISCONTIGMEM */
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void __init setup_bootmem_allocator(void)
{
@@ -1475,6 +1476,7 @@ void __init setup_arch(char **cmdline_p)
#endif
paging_init();
remapped_pgdat_init();
+ sparse_init();
zone_sizes_init();

/*
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/i386/mm/discontig.c current/arch/i386/mm/discontig.c
--- reference/arch/i386/mm/discontig.c 2005-05-04 20:54:20.000000000 +0100
+++ current/arch/i386/mm/discontig.c 2005-05-04 20:54:34.000000000 +0100
@@ -42,12 +42,16 @@ bootmem_data_t node0_bdata;
* populated the following initialisation.
*
* 1) node_online_map - the map of all nodes configured (online) in the system
- * 2) physnode_map - the mapping between a pfn and owning node
- * 3) node_start_pfn - the starting page frame number for a node
+ * 2) node_start_pfn - the starting page frame number for a node
* 3) node_end_pfn - the ending page fram number for a node
*/
+unsigned long node_start_pfn[MAX_NUMNODES];
+unsigned long node_end_pfn[MAX_NUMNODES];
+

+#ifdef CONFIG_DISCONTIGMEM
/*
+ * 4) physnode_map - the mapping between a pfn and owning node
* physnode_map keeps track of the physical memory layout of a generic
* numa node on a 256Mb break (each element of the array will
* represent 256Mb of memory and will be marked by the node id. so,
@@ -85,9 +89,7 @@ unsigned long node_memmap_size_bytes(int

return (nr_pages + 1) * sizeof(struct page);
}
-
-unsigned long node_start_pfn[MAX_NUMNODES];
-unsigned long node_end_pfn[MAX_NUMNODES];
+#endif

extern unsigned long find_max_low_pfn(void);
extern void find_max_pfn(void);
@@ -390,24 +392,26 @@ void __init set_highmem_pages_init(int b
{
#ifdef CONFIG_HIGHMEM
struct zone *zone;
+ struct page *page;

for_each_zone(zone) {
- unsigned long node_pfn, node_high_size, zone_start_pfn;
- struct page * zone_mem_map;
-
+ unsigned long node_pfn, zone_start_pfn, zone_end_pfn;
+
if (!is_highmem(zone))
continue;

- printk("Initializing %s for node %d\n", zone->name,
- zone->zone_pgdat->node_id);
-
- node_high_size = zone->spanned_pages;
- zone_mem_map = zone->zone_mem_map;
zone_start_pfn = zone->zone_start_pfn;
+ zone_end_pfn = zone_start_pfn + zone->spanned_pages;

- for (node_pfn = 0; node_pfn < node_high_size; node_pfn++) {
- one_highpage_init((struct page *)(zone_mem_map + node_pfn),
- zone_start_pfn + node_pfn, bad_ppro);
+ printk("Initializing %s for node %d (%08lx:%08lx)\n",
+ zone->name, zone->zone_pgdat->node_id,
+ zone_start_pfn, zone_end_pfn);
+
+ for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) {
+ if (!pfn_valid(node_pfn))
+ continue;
+ page = pfn_to_page(node_pfn);
+ one_highpage_init(page, node_pfn, bad_ppro);
}
}
totalram_pages += totalhigh_pages;
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/i386/mm/init.c current/arch/i386/mm/init.c
--- reference/arch/i386/mm/init.c 2005-05-04 20:54:20.000000000 +0100
+++ current/arch/i386/mm/init.c 2005-05-04 20:54:35.000000000 +0100
@@ -277,7 +277,9 @@ void __init one_highpage_init(struct pag
SetPageReserved(page);
}

-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_NUMA
+extern void set_highmem_pages_init(int);
+#else
static void __init set_highmem_pages_init(int bad_ppro)
{
int pfn;
@@ -285,9 +287,7 @@ static void __init set_highmem_pages_ini
one_highpage_init(pfn_to_page(pfn), pfn, bad_ppro);
totalram_pages += totalhigh_pages;
}
-#else
-extern void set_highmem_pages_init(int);
-#endif /* !CONFIG_DISCONTIGMEM */
+#endif /* CONFIG_FLATMEM */

#else
#define kmap_init() do { } while (0)
@@ -298,10 +298,10 @@ extern void set_highmem_pages_init(int);
unsigned long long __PAGE_KERNEL = _PAGE_KERNEL;
unsigned long long __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;

-#ifndef CONFIG_DISCONTIGMEM
-#define remap_numa_kva() do {} while (0)
-#else
+#ifdef CONFIG_NUMA
extern void __init remap_numa_kva(void);
+#else
+#define remap_numa_kva() do {} while (0)
#endif

static void __init pagetable_init (void)
@@ -526,7 +526,7 @@ static void __init set_max_mapnr_init(vo
#else
num_physpages = max_low_pfn;
#endif
-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_FLATMEM
max_mapnr = num_physpages;
#endif
}
@@ -540,7 +540,7 @@ void __init mem_init(void)
int tmp;
int bad_ppro;

-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_FLATMEM
if (!mem_map)
BUG();
#endif
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/i386/mm/Makefile current/arch/i386/mm/Makefile
--- reference/arch/i386/mm/Makefile 2005-01-21 14:04:05.000000000 +0000
+++ current/arch/i386/mm/Makefile 2005-05-04 20:54:34.000000000 +0100
@@ -4,7 +4,7 @@

obj-y := init.o pgtable.o fault.o ioremap.o extable.o pageattr.o mmap.o

-obj-$(CONFIG_DISCONTIGMEM) += discontig.o
+obj-$(CONFIG_NUMA) += discontig.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_HIGHMEM) += highmem.o
obj-$(CONFIG_BOOT_IOREMAP) += boot_ioremap.o
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-i386/mmzone.h current/include/asm-i386/mmzone.h
--- reference/include/asm-i386/mmzone.h 2005-05-04 20:54:26.000000000 +0100
+++ current/include/asm-i386/mmzone.h 2005-05-04 20:54:35.000000000 +0100
@@ -8,7 +8,9 @@

#include <asm/smp.h>

-#ifdef CONFIG_DISCONTIGMEM
+#if CONFIG_NUMA
+extern struct pglist_data *node_data[];
+#define NODE_DATA(nid) (node_data[nid])

#ifdef CONFIG_NUMA
#ifdef CONFIG_X86_NUMAQ
@@ -21,8 +23,28 @@
#define get_zholes_size(n) (0)
#endif /* CONFIG_NUMA */

-extern struct pglist_data *node_data[];
-#define NODE_DATA(nid) (node_data[nid])
+extern int get_memcfg_numa_flat(void );
+/*
+ * This allows any one NUMA architecture to be compiled
+ * for, and still fall back to the flat function if it
+ * fails.
+ */
+static inline void get_memcfg_numa(void)
+{
+#ifdef CONFIG_X86_NUMAQ
+ if (get_memcfg_numaq())
+ return;
+#elif CONFIG_ACPI_SRAT
+ if (get_memcfg_from_srat())
+ return;
+#endif
+
+ get_memcfg_numa_flat();
+}
+
+#endif /* CONFIG_NUMA */
+
+#ifdef CONFIG_DISCONTIGMEM

/*
* generic node memory support, the following assumptions apply:
@@ -48,26 +70,6 @@ static inline int pfn_to_nid(unsigned lo
#endif
}

-/*
- * Following are macros that are specific to this numa platform.
- */
-#define reserve_bootmem(addr, size) \
- reserve_bootmem_node(NODE_DATA(0), (addr), (size))
-#define alloc_bootmem(x) \
- __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
-#define alloc_bootmem_low(x) \
- __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
-#define alloc_bootmem_pages(x) \
- __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
-#define alloc_bootmem_low_pages(x) \
- __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
-#define alloc_bootmem_node(ignore, x) \
- __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
-#define alloc_bootmem_pages_node(ignore, x) \
- __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
-#define alloc_bootmem_low_pages_node(ignore, x) \
- __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
-
#define node_localnr(pfn, nid) ((pfn) - node_data[nid]->node_start_pfn)

/*
@@ -121,28 +123,33 @@ static inline int pfn_valid(int pfn)
return (pfn < node_end_pfn(nid));
return 0;
}
-#endif
+#endif /* CONFIG_X86_NUMAQ */
+
+#endif /* CONFIG_DISCONTIGMEM */
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES

-extern int get_memcfg_numa_flat(void );
/*
- * This allows any one NUMA architecture to be compiled
- * for, and still fall back to the flat function if it
- * fails.
+ * Following are macros that are specific to this numa platform.
*/
-static inline void get_memcfg_numa(void)
-{
-#ifdef CONFIG_X86_NUMAQ
- if (get_memcfg_numaq())
- return;
-#elif CONFIG_ACPI_SRAT
- if (get_memcfg_from_srat())
- return;
-#endif
-
- get_memcfg_numa_flat();
-}
+#define reserve_bootmem(addr, size) \
+ reserve_bootmem_node(NODE_DATA(0), (addr), (size))
+#define alloc_bootmem(x) \
+ __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
+#define alloc_bootmem_low(x) \
+ __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
+#define alloc_bootmem_pages(x) \
+ __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
+#define alloc_bootmem_low_pages(x) \
+ __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
+#define alloc_bootmem_node(ignore, x) \
+ __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
+#define alloc_bootmem_pages_node(ignore, x) \
+ __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
+#define alloc_bootmem_low_pages_node(ignore, x) \
+ __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)

-#endif /* CONFIG_DISCONTIGMEM */
+#endif /* CONFIG_NEED_MULTIPLE_NODES */

extern int early_pfn_to_nid(unsigned long pfn);

diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-i386/page.h current/include/asm-i386/page.h
--- reference/include/asm-i386/page.h 2005-05-04 20:54:20.000000000 +0100
+++ current/include/asm-i386/page.h 2005-05-04 20:54:34.000000000 +0100
@@ -136,11 +136,11 @@ extern int page_is_ram(unsigned long pag
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_FLATMEM
#define pfn_to_page(pfn) (mem_map + (pfn))
#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
#define pfn_valid(pfn) ((pfn) < max_mapnr)
-#endif /* !CONFIG_DISCONTIGMEM */
+#endif /* CONFIG_FLATMEM */
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-i386/pgtable.h current/include/asm-i386/pgtable.h
--- reference/include/asm-i386/pgtable.h 2005-04-11 19:33:43.000000000 +0100
+++ current/include/asm-i386/pgtable.h 2005-05-04 20:54:34.000000000 +0100
@@ -398,9 +398,9 @@ extern void noexec_setup(const char *str

#endif /* !__ASSEMBLY__ */

-#ifndef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_FLATMEM
#define kern_addr_valid(addr) (1)
-#endif /* !CONFIG_DISCONTIGMEM */
+#endif /* CONFIG_FLATMEM */

#define io_remap_page_range(vma, vaddr, paddr, size, prot) \
remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-i386/sparsemem.h current/include/asm-i386/sparsemem.h
--- reference/include/asm-i386/sparsemem.h 1970-01-01 01:00:00.000000000 +0100
+++ current/include/asm-i386/sparsemem.h 2005-05-04 20:54:34.000000000 +0100
@@ -0,0 +1,31 @@
+#ifndef _I386_SPARSEMEM_H
+#define _I386_SPARSEMEM_H
+#ifdef CONFIG_SPARSEMEM
+
+/*
+ * generic non-linear memory support:
+ *
+ * 1) we will not split memory into more chunks than will fit into the
+ * flags field of the struct page
+ */
+
+/*
+ * SECTION_SIZE_BITS 2^N: how big each section will be
+ * MAX_PHYSADDR_BITS 2^N: how much physical address space we have
+ * MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
+ */
+#ifdef CONFIG_X86_PAE
+#define SECTION_SIZE_BITS 30
+#define MAX_PHYSADDR_BITS 36
+#define MAX_PHYSMEM_BITS 36
+#else
+#define SECTION_SIZE_BITS 26
+#define MAX_PHYSADDR_BITS 32
+#define MAX_PHYSMEM_BITS 32
+#endif
+
+/* XXX: FIXME -- wli */
+#define kern_addr_valid(kaddr) (0)
+
+#endif /* CONFIG_SPARSEMEM */
+#endif /* _I386_SPARSEMEM_H */
-
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