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authorYasunori Goto <y-goto@jp.fujitsu.com>2005-10-19 15:52:18 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-19 23:11:33 -0700
commit281dd25cdc0d6903929b79183816d151ea626341 (patch)
treeed7898462492d853e422eb7f130f0b6e7efc0b69 /include/linux
parent51b190b304bbeb1090ba20b0623d39917fa62997 (diff)
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[PATCH] swiotlb: make sure initial DMA allocations really are in DMA memory
This introduces a limit parameter to the core bootmem allocator; The new parameter indicates that physical memory allocated by the bootmem allocator should be within the requested limit. We also introduce alloc_bootmem_low_pages_limit, alloc_bootmem_node_limit, alloc_bootmem_low_pages_node_limit apis, but alloc_bootmem_low_pages_limit is the only api used for swiotlb. The existing alloc_bootmem_low_pages() api could instead have been changed and made to pass right limit to the core allocator. But that would make the patch more intrusive for 2.6.14, as other arches use alloc_bootmem_low_pages(). We may be done that post 2.6.14 as a cleanup. With this, swiotlb gets memory within 4G for both x86_64 and ia64 arches. Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Ravikiran G Thirumalai <kiran@scalex86.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/bootmem.h32
1 files changed, 30 insertions, 2 deletions
diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
index 82bd8842d11c..3b03b0b868dd 100644
--- a/include/linux/bootmem.h
+++ b/include/linux/bootmem.h
@@ -43,7 +43,7 @@ typedef struct bootmem_data {
extern unsigned long __init bootmem_bootmap_pages (unsigned long);
extern unsigned long __init init_bootmem (unsigned long addr, unsigned long memend);
extern void __init free_bootmem (unsigned long addr, unsigned long size);
-extern void * __init __alloc_bootmem (unsigned long size, unsigned long align, unsigned long goal);
+extern void * __init __alloc_bootmem_limit (unsigned long size, unsigned long align, unsigned long goal, unsigned long limit);
#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
extern void __init reserve_bootmem (unsigned long addr, unsigned long size);
#define alloc_bootmem(x) \
@@ -54,6 +54,16 @@ extern void __init reserve_bootmem (unsigned long addr, unsigned long size);
__alloc_bootmem((x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_low_pages(x) \
__alloc_bootmem((x), PAGE_SIZE, 0)
+
+#define alloc_bootmem_limit(x, limit) \
+ __alloc_bootmem_limit((x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS), (limit))
+#define alloc_bootmem_low_limit(x, limit) \
+ __alloc_bootmem_limit((x), SMP_CACHE_BYTES, 0, (limit))
+#define alloc_bootmem_pages_limit(x, limit) \
+ __alloc_bootmem_limit((x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS), (limit))
+#define alloc_bootmem_low_pages_limit(x, limit) \
+ __alloc_bootmem_limit((x), PAGE_SIZE, 0, (limit))
+
#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
extern unsigned long __init free_all_bootmem (void);
@@ -61,7 +71,7 @@ extern unsigned long __init init_bootmem_node (pg_data_t *pgdat, unsigned long f
extern void __init reserve_bootmem_node (pg_data_t *pgdat, unsigned long physaddr, unsigned long size);
extern void __init free_bootmem_node (pg_data_t *pgdat, unsigned long addr, unsigned long size);
extern unsigned long __init free_all_bootmem_node (pg_data_t *pgdat);
-extern void * __init __alloc_bootmem_node (pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal);
+extern void * __init __alloc_bootmem_node_limit (pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal, unsigned long limit);
#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
#define alloc_bootmem_node(pgdat, x) \
__alloc_bootmem_node((pgdat), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
@@ -69,6 +79,14 @@ extern void * __init __alloc_bootmem_node (pg_data_t *pgdat, unsigned long size,
__alloc_bootmem_node((pgdat), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_low_pages_node(pgdat, x) \
__alloc_bootmem_node((pgdat), (x), PAGE_SIZE, 0)
+
+#define alloc_bootmem_node_limit(pgdat, x, limit) \
+ __alloc_bootmem_node_limit((pgdat), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS), (limit))
+#define alloc_bootmem_pages_node_limit(pgdat, x, limit) \
+ __alloc_bootmem_node_limit((pgdat), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS), (limit))
+#define alloc_bootmem_low_pages_node_limit(pgdat, x, limit) \
+ __alloc_bootmem_node_limit((pgdat), (x), PAGE_SIZE, 0, (limit))
+
#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
@@ -105,5 +123,15 @@ extern void *__init alloc_large_system_hash(const char *tablename,
#endif
extern int __initdata hashdist; /* Distribute hashes across NUMA nodes? */
+static inline void *__alloc_bootmem (unsigned long size, unsigned long align, unsigned long goal)
+{
+ return __alloc_bootmem_limit(size, align, goal, 0);
+}
+
+static inline void *__alloc_bootmem_node (pg_data_t *pgdat, unsigned long size, unsigned long align,
+ unsigned long goal)
+{
+ return __alloc_bootmem_node_limit(pgdat, size, align, goal, 0);
+}
#endif /* _LINUX_BOOTMEM_H */