[3/3] sparsemem memory model for ppc64
From: Andy Whitcroft
Date: Wed May 04 2005 - 15:44:51 EST
Provide the architecture specific implementation for SPARSEMEM for
PPC64 systems.
Signed-off-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
Signed-off-by: Dave Hansen <haveblue@xxxxxxxxxx>
Signed-off-by: Mike Kravetz <kravetz@xxxxxxxxxx> (in part)
Signed-off-by: Martin Bligh <mbligh@xxxxxxxxxxx>
---
arch/ppc64/Kconfig | 13 ++++++++++++-
arch/ppc64/kernel/setup.c | 1 +
arch/ppc64/mm/Makefile | 2 +-
arch/ppc64/mm/init.c | 24 +++++++++++++++++++-----
include/asm-ppc64/mmzone.h | 36 +++++++++++++++++++++++-------------
include/asm-ppc64/page.h | 3 ++-
include/asm-ppc64/sparsemem.h | 16 ++++++++++++++++
7 files changed, 74 insertions(+), 21 deletions(-)
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/ppc64/Kconfig current/arch/ppc64/Kconfig
--- reference/arch/ppc64/Kconfig 2005-05-04 20:54:52.000000000 +0100
+++ current/arch/ppc64/Kconfig 2005-05-04 20:54:54.000000000 +0100
@@ -198,6 +198,13 @@ config HMT
This option enables hardware multithreading on RS64 cpus.
pSeries systems p620 and p660 have such a cpu type.
+config ARCH_SELECT_MEMORY_MODEL
+ def_bool y
+
+config ARCH_FLATMEM_ENABLE
+ def_bool y
+ depends on !NUMA
+
config ARCH_DISCONTIGMEM_ENABLE
def_bool y
depends on SMP && PPC_PSERIES
@@ -209,6 +216,10 @@ config ARCH_DISCONTIGMEM_DEFAULT
config ARCH_FLATMEM_ENABLE
def_bool y
+config ARCH_SPARSEMEM_ENABLE
+ def_bool y
+ depends on ARCH_DISCONTIGMEM_ENABLE
+
source "mm/Kconfig"
config HAVE_ARCH_EARLY_PFN_TO_NID
@@ -229,7 +240,7 @@ config NODES_SPAN_OTHER_NODES
config NUMA
bool "NUMA support"
- depends on DISCONTIGMEM
+ default y if DISCONTIGMEM || SPARSEMEM
config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support"
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/ppc64/kernel/setup.c current/arch/ppc64/kernel/setup.c
--- reference/arch/ppc64/kernel/setup.c 2005-04-11 19:33:15.000000000 +0100
+++ current/arch/ppc64/kernel/setup.c 2005-05-04 20:54:53.000000000 +0100
@@ -1059,6 +1059,7 @@ void __init setup_arch(char **cmdline_p)
/* set up the bootmem stuff with available memory */
do_init_bootmem();
+ sparse_init();
/* initialize the syscall map in systemcfg */
setup_syscall_map();
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/ppc64/mm/init.c current/arch/ppc64/mm/init.c
--- reference/arch/ppc64/mm/init.c 2005-05-04 20:54:20.000000000 +0100
+++ current/arch/ppc64/mm/init.c 2005-05-04 20:54:54.000000000 +0100
@@ -601,13 +601,21 @@ EXPORT_SYMBOL(page_is_ram);
* Initialize the bootmem system and give it all the memory we
* have available.
*/
-#ifndef CONFIG_DISCONTIGMEM
+#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init do_init_bootmem(void)
{
unsigned long i;
unsigned long start, bootmap_pages;
unsigned long total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
int boot_mapsize;
+ unsigned long start_pfn, end_pfn;
+ /*
+ * Note presence of first (logical/coalasced) LMB which will
+ * contain RMO region
+ */
+ start_pfn = lmb.memory.region[0].physbase >> PAGE_SHIFT;
+ end_pfn = start_pfn + (lmb.memory.region[0].size >> PAGE_SHIFT);
+ memory_present(0, start_pfn, end_pfn);
/*
* Find an area to use for the bootmem bitmap. Calculate the size of
@@ -623,12 +631,18 @@ void __init do_init_bootmem(void)
max_pfn = max_low_pfn;
- /* add all physical memory to the bootmem map. Also find the first */
+ /* add all physical memory to the bootmem map. Also, find the first
+ * presence of all LMBs*/
for (i=0; i < lmb.memory.cnt; i++) {
unsigned long physbase, size;
physbase = lmb.memory.region[i].physbase;
size = lmb.memory.region[i].size;
+ if (i) { /* already created mappings for first LMB */
+ start_pfn = physbase >> PAGE_SHIFT;
+ end_pfn = start_pfn + (size >> PAGE_SHIFT);
+ }
+ memory_present(0, start_pfn, end_pfn);
free_bootmem(physbase, size);
}
@@ -667,7 +681,7 @@ void __init paging_init(void)
free_area_init_node(0, &contig_page_data, zones_size,
__pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
}
-#endif /* CONFIG_DISCONTIGMEM */
+#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
static struct kcore_list kcore_vmem;
@@ -698,7 +712,7 @@ module_init(setup_kcore);
void __init mem_init(void)
{
-#ifdef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_NEED_MULTIPLE_NODES
int nid;
#endif
pg_data_t *pgdat;
@@ -709,7 +723,7 @@ void __init mem_init(void)
num_physpages = max_low_pfn; /* RAM is assumed contiguous */
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
-#ifdef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_NEED_MULTIPLE_NODES
for_each_online_node(nid) {
if (NODE_DATA(nid)->node_spanned_pages != 0) {
printk("freeing bootmem node %x\n", nid);
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/arch/ppc64/mm/Makefile current/arch/ppc64/mm/Makefile
--- reference/arch/ppc64/mm/Makefile 2005-01-21 14:04:09.000000000 +0000
+++ current/arch/ppc64/mm/Makefile 2005-05-04 20:54:54.000000000 +0100
@@ -6,6 +6,6 @@ EXTRA_CFLAGS += -mno-minimal-toc
obj-y := fault.o init.o imalloc.o hash_utils.o hash_low.o tlb.o \
slb_low.o slb.o stab.o mmap.o
-obj-$(CONFIG_DISCONTIGMEM) += numa.o
+obj-$(CONFIG_NEED_MULTIPLE_NODES) += numa.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_PPC_MULTIPLATFORM) += hash_native.o
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-ppc64/mmzone.h current/include/asm-ppc64/mmzone.h
--- reference/include/asm-ppc64/mmzone.h 2005-05-04 20:54:50.000000000 +0100
+++ current/include/asm-ppc64/mmzone.h 2005-05-04 20:54:54.000000000 +0100
@@ -10,9 +10,20 @@
#include <linux/config.h>
#include <asm/smp.h>
-#ifdef CONFIG_DISCONTIGMEM
+/* 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
+ */
+
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES
extern struct pglist_data *node_data[];
+/*
+ * Return a pointer to the node data for node n.
+ */
+#define NODE_DATA(nid) (node_data[nid])
/*
* Following are specific to this numa platform.
@@ -47,30 +58,27 @@ static inline int pa_to_nid(unsigned lon
return nid;
}
-#define pfn_to_nid(pfn) pa_to_nid((pfn) << PAGE_SHIFT)
-
-/*
- * Return a pointer to the node data for node n.
- */
-#define NODE_DATA(nid) (node_data[nid])
-
#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
/*
* Following are macros that each numa implmentation must define.
*/
-/*
- * Given a kernel address, find the home node of the underlying memory.
- */
-#define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
-
#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
#define local_mapnr(kvaddr) \
( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr))
+#ifdef CONFIG_DISCONTIGMEM
+
+/*
+ * Given a kernel address, find the home node of the underlying memory.
+ */
+#define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
+
+#define pfn_to_nid(pfn) pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
+
/* Written this way to avoid evaluating arguments twice */
#define discontigmem_pfn_to_page(pfn) \
({ \
@@ -91,6 +99,8 @@ static inline int pa_to_nid(unsigned lon
#endif /* CONFIG_DISCONTIGMEM */
+#endif /* CONFIG_NEED_MULTIPLE_NODES */
+
#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
#define early_pfn_to_nid(pfn) pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
#endif
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-ppc64/page.h current/include/asm-ppc64/page.h
--- reference/include/asm-ppc64/page.h 2005-04-11 19:33:45.000000000 +0100
+++ current/include/asm-ppc64/page.h 2005-05-04 20:54:54.000000000 +0100
@@ -224,7 +224,8 @@ extern u64 ppc64_pft_size; /* Log 2 of
#define page_to_pfn(page) discontigmem_page_to_pfn(page)
#define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn)
#define pfn_valid(pfn) discontigmem_pfn_valid(pfn)
-#else
+#endif
+#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)
diff -X /home/apw/brief/lib/vdiff.excl -rupN reference/include/asm-ppc64/sparsemem.h current/include/asm-ppc64/sparsemem.h
--- reference/include/asm-ppc64/sparsemem.h 1970-01-01 01:00:00.000000000 +0100
+++ current/include/asm-ppc64/sparsemem.h 2005-05-04 20:54:54.000000000 +0100
@@ -0,0 +1,16 @@
+#ifndef _ASM_PPC64_SPARSEMEM_H
+#define _ASM_PPC64_SPARSEMEM_H 1
+
+#ifdef CONFIG_SPARSEMEM
+/*
+ * 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
+ */
+#define SECTION_SIZE_BITS 24
+#define MAX_PHYSADDR_BITS 38
+#define MAX_PHYSMEM_BITS 36
+
+#endif /* CONFIG_SPARSEMEM */
+
+#endif /* _ASM_PPC64_SPARSEMEM_H */
-
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