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sparc64: Adjust vmalloc region size based upon available virtual address bits.

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In order to accomodate embedded per-cpu allocation with large numbers
of cpus and numa nodes, we have to use as much virtual address space
as possible for the vmalloc region.  Otherwise we can get things like:

PERCPU: max_distance=0x380001c10000 too large for vmalloc space 0xff00000000

So, once we select a value for PAGE_OFFSET, derive the size of the
vmalloc region based upon that.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
This commit is contained in:
David S. Miller 2014-09-27 11:05:21 -07:00
parent 7c0fa0f24b
commit bb4e6e85da
4 changed files with 28 additions and 20 deletions
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1
arch/sparc/include/asm/page_64.h
View File

@ -117,7 +117,6 @@ extern unsigned long sparc64_va_hole_bottom;
#include <asm-generic/memory_model.h>
#define PAGE_OFFSET_BY_BITS(X) (-(_AC(1,UL) << (X)))
extern unsigned long PAGE_OFFSET;
#endif /* !(__ASSEMBLY__) */

9
arch/sparc/include/asm/pgtable_64.h
View File

@ -40,10 +40,7 @@
#define LOW_OBP_ADDRESS _AC(0x00000000f0000000,UL)
#define HI_OBP_ADDRESS _AC(0x0000000100000000,UL)
#define VMALLOC_START _AC(0x0000000100000000,UL)
#define VMALLOC_END _AC(0x0000010000000000,UL)
#define VMEMMAP_BASE _AC(0x0000010000000000,UL)
#define vmemmap ((struct page *)VMEMMAP_BASE)
#define VMEMMAP_BASE VMALLOC_END
/* PMD_SHIFT determines the size of the area a second-level page
* table can map
@ -81,6 +78,10 @@
#ifndef __ASSEMBLY__
extern unsigned long VMALLOC_END;
#define vmemmap ((struct page *)VMEMMAP_BASE)
#include <linux/sched.h>
bool kern_addr_valid(unsigned long addr);

8
arch/sparc/kernel/ktlb.S
View File

@ -199,8 +199,8 @@ kvmap_dtlb_nonlinear:
#ifdef CONFIG_SPARSEMEM_VMEMMAP
/* Do not use the TSB for vmemmap. */
mov (VMEMMAP_BASE >> 40), %g5
sllx %g5, 40, %g5
sethi %hi(VMEMMAP_BASE), %g5
ldx [%g5 + %lo(VMEMMAP_BASE)], %g5
cmp %g4,%g5
bgeu,pn %xcc, kvmap_vmemmap
nop
@ -212,8 +212,8 @@ kvmap_dtlb_tsbmiss:
sethi %hi(MODULES_VADDR), %g5
cmp %g4, %g5
blu,pn %xcc, kvmap_dtlb_longpath
mov (VMALLOC_END >> 40), %g5
sllx %g5, 40, %g5
sethi %hi(VMALLOC_END), %g5
ldx [%g5 + %lo(VMALLOC_END)], %g5
cmp %g4, %g5
bgeu,pn %xcc, kvmap_dtlb_longpath
nop

30
arch/sparc/mm/init_64.c
View File

@ -1369,25 +1369,24 @@ static unsigned long max_phys_bits = 40;
bool kern_addr_valid(unsigned long addr)
{
unsigned long above = ((long)addr) >> max_phys_bits;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
if (above != 0 && above != -1UL)
return false;
if ((long)addr < 0L) {
unsigned long pa = __pa(addr);
if ((addr >> max_phys_bits) != 0UL)
return false;
return pfn_valid(pa >> PAGE_SHIFT);
}
if (addr >= (unsigned long) KERNBASE &&
addr < (unsigned long)&_end)
return true;
if (addr >= PAGE_OFFSET) {
unsigned long pa = __pa(addr);
return pfn_valid(pa >> PAGE_SHIFT);
}
pgd = pgd_offset_k(addr);
if (pgd_none(*pgd))
return 0;
@ -1656,6 +1655,9 @@ unsigned long __init find_ecache_flush_span(unsigned long size)
unsigned long PAGE_OFFSET;
EXPORT_SYMBOL(PAGE_OFFSET);
unsigned long VMALLOC_END = 0x0000010000000000UL;
EXPORT_SYMBOL(VMALLOC_END);
unsigned long sparc64_va_hole_top = 0xfffff80000000000UL;
unsigned long sparc64_va_hole_bottom = 0x0000080000000000UL;
@ -1712,10 +1714,16 @@ static void __init setup_page_offset(void)
prom_halt();
}
PAGE_OFFSET = PAGE_OFFSET_BY_BITS(max_phys_bits);
PAGE_OFFSET = sparc64_va_hole_top;
VMALLOC_END = ((sparc64_va_hole_bottom >> 1) +
(sparc64_va_hole_bottom >> 2));
pr_info("PAGE_OFFSET is 0x%016lx (max_phys_bits == %lu)\n",
pr_info("MM: PAGE_OFFSET is 0x%016lx (max_phys_bits == %lu)\n",
PAGE_OFFSET, max_phys_bits);
pr_info("MM: VMALLOC [0x%016lx --> 0x%016lx]\n",
VMALLOC_START, VMALLOC_END);
pr_info("MM: VMEMMAP [0x%016lx --> 0x%016lx]\n",
VMEMMAP_BASE, VMEMMAP_BASE << 1);
}
static void __init tsb_phys_patch(void)