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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-04-30 15:41:48 +1000
committerPaul Mackerras <paulus@samba.org>2008-05-15 20:49:25 +1000
commitcec08e7a948326b01555be6311480aa08e637de2 (patch)
treea08e1d91c9a0c5eaa4e81036a3d7f992b2de1745
parent08fcf1d61193d7b7779aa6d7388535e26e064a0b (diff)
downloadop-kernel-dev-cec08e7a948326b01555be6311480aa08e637de2.zip
op-kernel-dev-cec08e7a948326b01555be6311480aa08e637de2.tar.gz
[POWERPC] vmemmap fixes to use smaller pages
This changes vmemmap to use a different region (region 0xf) of the address space, and to configure the page size of that region dynamically at boot. The problem with the current approach of always using 16M pages is that it's not well suited to machines that have small amounts of memory such as small partitions on pseries, or PS3's. In fact, on the PS3, failure to allocate the 16M page backing vmmemmap tends to prevent hotplugging the HV's "additional" memory, thus limiting the available memory even more, from my experience down to something like 80M total, which makes it really not very useable. The logic used by my match to choose the vmemmap page size is: - If 16M pages are available and there's 1G or more RAM at boot, use that size. - Else if 64K pages are available, use that - Else use 4K pages I've tested on a POWER6 (16M pages) and on an iSeries POWER3 (4K pages) and it seems to work fine. Note that I intend to change the way we organize the kernel regions & SLBs so the actual region will change from 0xf back to something else at one point, as I simplify the SLB miss handler, but that will be for a later patch. Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/mm/hash_utils_64.c28
-rw-r--r--arch/powerpc/mm/init_64.c10
-rw-r--r--arch/powerpc/mm/slb.c16
-rw-r--r--arch/powerpc/mm/slb_low.S16
-rw-r--r--include/asm-powerpc/mmu-hash64.h1
-rw-r--r--include/asm-powerpc/pgtable-ppc64.h10
6 files changed, 65 insertions, 16 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 2b5a399..0f2d239 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -94,6 +94,9 @@ unsigned long htab_hash_mask;
int mmu_linear_psize = MMU_PAGE_4K;
int mmu_virtual_psize = MMU_PAGE_4K;
int mmu_vmalloc_psize = MMU_PAGE_4K;
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+int mmu_vmemmap_psize = MMU_PAGE_4K;
+#endif
int mmu_io_psize = MMU_PAGE_4K;
int mmu_kernel_ssize = MMU_SEGSIZE_256M;
int mmu_highuser_ssize = MMU_SEGSIZE_256M;
@@ -387,11 +390,32 @@ static void __init htab_init_page_sizes(void)
}
#endif /* CONFIG_PPC_64K_PAGES */
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ /* We try to use 16M pages for vmemmap if that is supported
+ * and we have at least 1G of RAM at boot
+ */
+ if (mmu_psize_defs[MMU_PAGE_16M].shift &&
+ lmb_phys_mem_size() >= 0x40000000)
+ mmu_vmemmap_psize = MMU_PAGE_16M;
+ else if (mmu_psize_defs[MMU_PAGE_64K].shift)
+ mmu_vmemmap_psize = MMU_PAGE_64K;
+ else
+ mmu_vmemmap_psize = MMU_PAGE_4K;
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
+
printk(KERN_DEBUG "Page orders: linear mapping = %d, "
- "virtual = %d, io = %d\n",
+ "virtual = %d, io = %d"
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ ", vmemmap = %d"
+#endif
+ "\n",
mmu_psize_defs[mmu_linear_psize].shift,
mmu_psize_defs[mmu_virtual_psize].shift,
- mmu_psize_defs[mmu_io_psize].shift);
+ mmu_psize_defs[mmu_io_psize].shift
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ ,mmu_psize_defs[mmu_vmemmap_psize].shift
+#endif
+ );
#ifdef CONFIG_HUGETLB_PAGE
/* Init large page size. Currently, we pick 16M or 1M depending
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index c5ac532..6aa6537 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -19,6 +19,8 @@
*
*/
+#undef DEBUG
+
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
@@ -208,12 +210,12 @@ int __meminit vmemmap_populated(unsigned long start, int page_size)
}
int __meminit vmemmap_populate(struct page *start_page,
- unsigned long nr_pages, int node)
+ unsigned long nr_pages, int node)
{
unsigned long mode_rw;
unsigned long start = (unsigned long)start_page;
unsigned long end = (unsigned long)(start_page + nr_pages);
- unsigned long page_size = 1 << mmu_psize_defs[mmu_linear_psize].shift;
+ unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
@@ -235,11 +237,11 @@ int __meminit vmemmap_populate(struct page *start_page,
start, p, __pa(p));
mapped = htab_bolt_mapping(start, start + page_size,
- __pa(p), mode_rw, mmu_linear_psize,
+ __pa(p), mode_rw, mmu_vmemmap_psize,
mmu_kernel_ssize);
BUG_ON(mapped < 0);
}
return 0;
}
-#endif
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index cf8705e..89497fb 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -28,7 +28,7 @@
#include <asm/udbg.h>
#ifdef DEBUG
-#define DBG(fmt...) udbg_printf(fmt)
+#define DBG(fmt...) printk(fmt)
#else
#define DBG pr_debug
#endif
@@ -263,13 +263,19 @@ void slb_initialize(void)
extern unsigned int *slb_miss_kernel_load_linear;
extern unsigned int *slb_miss_kernel_load_io;
extern unsigned int *slb_compare_rr_to_size;
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ extern unsigned int *slb_miss_kernel_load_vmemmap;
+ unsigned long vmemmap_llp;
+#endif
/* Prepare our SLB miss handler based on our page size */
linear_llp = mmu_psize_defs[mmu_linear_psize].sllp;
io_llp = mmu_psize_defs[mmu_io_psize].sllp;
vmalloc_llp = mmu_psize_defs[mmu_vmalloc_psize].sllp;
get_paca()->vmalloc_sllp = SLB_VSID_KERNEL | vmalloc_llp;
-
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ vmemmap_llp = mmu_psize_defs[mmu_vmemmap_psize].sllp;
+#endif
if (!slb_encoding_inited) {
slb_encoding_inited = 1;
patch_slb_encoding(slb_miss_kernel_load_linear,
@@ -281,6 +287,12 @@ void slb_initialize(void)
DBG("SLB: linear LLP = %04lx\n", linear_llp);
DBG("SLB: io LLP = %04lx\n", io_llp);
+
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ patch_slb_encoding(slb_miss_kernel_load_vmemmap,
+ SLB_VSID_KERNEL | vmemmap_llp);
+ DBG("SLB: vmemmap LLP = %04lx\n", vmemmap_llp);
+#endif
}
get_paca()->stab_rr = SLB_NUM_BOLTED;
diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
index 657f6b3..bc44dc4 100644
--- a/arch/powerpc/mm/slb_low.S
+++ b/arch/powerpc/mm/slb_low.S
@@ -47,8 +47,7 @@ _GLOBAL(slb_allocate_realmode)
* it to VSID 0, which is reserved as a bad VSID - one which
* will never have any pages in it. */
- /* Check if hitting the linear mapping of the vmalloc/ioremap
- * kernel space
+ /* Check if hitting the linear mapping or some other kernel space
*/
bne cr7,1f
@@ -62,7 +61,18 @@ BEGIN_FTR_SECTION
END_FTR_SECTION_IFCLR(CPU_FTR_1T_SEGMENT)
b slb_finish_load_1T
-1: /* vmalloc/ioremap mapping encoding bits, the "li" instructions below
+1:
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+ /* Check virtual memmap region. To be patches at kernel boot */
+ cmpldi cr0,r9,0xf
+ bne 1f
+_GLOBAL(slb_miss_kernel_load_vmemmap)
+ li r11,0
+ b 6f
+1:
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
+
+ /* vmalloc/ioremap mapping encoding bits, the "li" instructions below
* will be patched by the kernel at boot
*/
BEGIN_FTR_SECTION
diff --git a/include/asm-powerpc/mmu-hash64.h b/include/asm-powerpc/mmu-hash64.h
index 0dff767..39c5c5f 100644
--- a/include/asm-powerpc/mmu-hash64.h
+++ b/include/asm-powerpc/mmu-hash64.h
@@ -177,6 +177,7 @@ extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
extern int mmu_linear_psize;
extern int mmu_virtual_psize;
extern int mmu_vmalloc_psize;
+extern int mmu_vmemmap_psize;
extern int mmu_io_psize;
extern int mmu_kernel_ssize;
extern int mmu_highuser_ssize;
diff --git a/include/asm-powerpc/pgtable-ppc64.h b/include/asm-powerpc/pgtable-ppc64.h
index 27f1869..cc6a43b 100644
--- a/include/asm-powerpc/pgtable-ppc64.h
+++ b/include/asm-powerpc/pgtable-ppc64.h
@@ -65,15 +65,15 @@
#define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
#define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
+#define VMEMMAP_REGION_ID (0xfUL)
#define USER_REGION_ID (0UL)
/*
- * Defines the address of the vmemap area, in the top 16th of the
- * kernel region.
+ * Defines the address of the vmemap area, in its own region
*/
-#define VMEMMAP_BASE (ASM_CONST(CONFIG_KERNEL_START) + \
- (0xfUL << (REGION_SHIFT - 4)))
-#define vmemmap ((struct page *)VMEMMAP_BASE)
+#define VMEMMAP_BASE (VMEMMAP_REGION_ID << REGION_SHIFT)
+#define vmemmap ((struct page *)VMEMMAP_BASE)
+
/*
* Common bits in a linux-style PTE. These match the bits in the
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