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Commit c50f68c8 authored by David S. Miller's avatar David S. Miller Committed by Paul Mackerras
Browse files

[LMB] Add lmb_alloc_nid() 



A variant of lmb_alloc() that tries to allocate memory on a specified
NUMA node 'nid' but falls back to normal lmb_alloc() if that fails.

The caller provides a 'nid_range' function pointer which assists the
allocator.  It is given args 'start', 'end', and pointer to integer
'this_nid'.

It places at 'this_nid' the NUMA node id that corresponds to 'start',
and returns the end address within 'start' to 'end' at which memory
assosciated with 'nid' ends.

This callback allows a platform to use lmb_alloc_nid() in just
about any context, even ones in which early_pfn_to_nid() might
not be working yet.

This function will be used by the NUMA setup code on sparc64, and also
it can be used by powerpc, replacing it's hand crafted
"careful_allocation()" function in arch/powerpc/mm/numa.c

If x86 ever converts it's NUMA support over to using the LMB helpers,
it can use this too as it has something entirely similar.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 4b1d99b3

include/linux/lmb.h

+2 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ extern void __init lmb_init(void); 
extern void __init lmb_analyze(void);

extern long __init lmb_add(u64 base, u64 size);

extern long __init lmb_reserve(u64 base, u64 size);

extern u64 __init lmb_alloc_nid(u64 size, u64 align, int nid,

				u64 (*nid_range)(u64, u64, int *));

extern u64 __init lmb_alloc(u64 size, u64 align);

extern u64 __init lmb_alloc_base(u64 size,

		u64, u64 max_addr);

lib/lmb.c

+76 −10
Original line number Diff line number Diff line
@@ -232,6 +232,82 @@ long __init lmb_overlaps_region(struct lmb_region *rgn, u64 base, 
	return (i < rgn->cnt) ? i : -1;

}



static u64 lmb_align_down(u64 addr, u64 size)

{

	return addr & ~(size - 1);

}



static u64 lmb_align_up(u64 addr, u64 size)

{

	return (addr + (size - 1)) & ~(size - 1);

}



static u64 __init lmb_alloc_nid_unreserved(u64 start, u64 end,

					   u64 size, u64 align)

{

	u64 base;

	long j;



	base = lmb_align_down((end - size), align);

	while (start <= base &&

	       ((j = lmb_overlaps_region(&lmb.reserved, base, size)) >= 0))

		base = lmb_align_down(lmb.reserved.region[j].base - size,

				      align);



	if (base != 0 && start <= base) {

		if (lmb_add_region(&lmb.reserved, base,

				   lmb_align_up(size, align)) < 0)

			base = ~(u64)0;

		return base;

	}



	return ~(u64)0;

}



static u64 __init lmb_alloc_nid_region(struct lmb_property *mp,

				       u64 (*nid_range)(u64, u64, int *),

				       u64 size, u64 align, int nid)

{

	u64 start, end;



	start = mp->base;

	end = start + mp->size;



	start = lmb_align_up(start, align);

	while (start < end) {

		u64 this_end;

		int this_nid;



		this_end = nid_range(start, end, &this_nid);

		if (this_nid == nid) {

			u64 ret = lmb_alloc_nid_unreserved(start, this_end,

							   size, align);

			if (ret != ~(u64)0)

				return ret;

		}

		start = this_end;

	}



	return ~(u64)0;

}



u64 __init lmb_alloc_nid(u64 size, u64 align, int nid,

			 u64 (*nid_range)(u64 start, u64 end, int *nid))

{

	struct lmb_region *mem = &lmb.memory;

	int i;



	for (i = 0; i < mem->cnt; i++) {

		u64 ret = lmb_alloc_nid_region(&mem->region[i],

					       nid_range,

					       size, align, nid);

		if (ret != ~(u64)0)

			return ret;

	}



	return lmb_alloc(size, align);

}



u64 __init lmb_alloc(u64 size, u64 align)

{

	return lmb_alloc_base(size, align, LMB_ALLOC_ANYWHERE);
@@ -250,16 +326,6 @@ u64 __init lmb_alloc_base(u64 size, u64 align, u64 max_addr) 
	return alloc;

}



static u64 lmb_align_down(u64 addr, u64 size)

{

	return addr & ~(size - 1);

}



static u64 lmb_align_up(u64 addr, u64 size)

{

	return (addr + (size - 1)) & ~(size - 1);

}



u64 __init __lmb_alloc_base(u64 size, u64 align, u64 max_addr)

{

	long i, j;