Commit bb4e6e85 authored by David S. Miller's avatar David S. Miller
Browse files

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



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: default avatarDavid S. Miller <davem@davemloft.net>
Acked-by: default avatarBob Picco <bob.picco@oracle.com>
parent 7c0fa0f2

arch/sparc/include/asm/page_64.h

+0 −1
Original line number Diff line number Diff line
@@ -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__) */

arch/sparc/include/asm/pgtable_64.h

+5 −4
Original line number Diff line number Diff line
@@ -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);

arch/sparc/kernel/ktlb.S

+4 −4
Original line number Diff line number Diff line
@@ -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

arch/sparc/mm/init_64.c

+19 −11
Original line number Diff line number Diff line
@@ -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)

	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)

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