mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Dan Williams](/assets/img/avatar_default.png)
Allow sub-section sized ranges to be added to the memmap. populate_section_memmap() takes an explict pfn range rather than assuming a full section, and those parameters are plumbed all the way through to vmmemap_populate(). There should be no sub-section usage in current deployments. New warnings are added to clarify which memmap allocation paths are sub-section capable. Link: http://lkml.kernel.org/r/156092352058.979959.6551283472062305149.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com> Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> [ppc64] Reviewed-by: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: David Hildenbrand <david@redhat.com> Cc: Logan Gunthorpe <logang@deltatee.com> Cc: Jane Chu <jane.chu@oracle.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Wei Yang <richardw.yang@linux.intel.com> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
270 lines
6.9 KiB
C
270 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Virtual Memory Map support
|
|
*
|
|
* (C) 2007 sgi. Christoph Lameter.
|
|
*
|
|
* Virtual memory maps allow VM primitives pfn_to_page, page_to_pfn,
|
|
* virt_to_page, page_address() to be implemented as a base offset
|
|
* calculation without memory access.
|
|
*
|
|
* However, virtual mappings need a page table and TLBs. Many Linux
|
|
* architectures already map their physical space using 1-1 mappings
|
|
* via TLBs. For those arches the virtual memory map is essentially
|
|
* for free if we use the same page size as the 1-1 mappings. In that
|
|
* case the overhead consists of a few additional pages that are
|
|
* allocated to create a view of memory for vmemmap.
|
|
*
|
|
* The architecture is expected to provide a vmemmap_populate() function
|
|
* to instantiate the mapping.
|
|
*/
|
|
#include <linux/mm.h>
|
|
#include <linux/mmzone.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/memremap.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
/*
|
|
* Allocate a block of memory to be used to back the virtual memory map
|
|
* or to back the page tables that are used to create the mapping.
|
|
* Uses the main allocators if they are available, else bootmem.
|
|
*/
|
|
|
|
static void * __ref __earlyonly_bootmem_alloc(int node,
|
|
unsigned long size,
|
|
unsigned long align,
|
|
unsigned long goal)
|
|
{
|
|
return memblock_alloc_try_nid_raw(size, align, goal,
|
|
MEMBLOCK_ALLOC_ACCESSIBLE, node);
|
|
}
|
|
|
|
void * __meminit vmemmap_alloc_block(unsigned long size, int node)
|
|
{
|
|
/* If the main allocator is up use that, fallback to bootmem. */
|
|
if (slab_is_available()) {
|
|
gfp_t gfp_mask = GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_NOWARN;
|
|
int order = get_order(size);
|
|
static bool warned;
|
|
struct page *page;
|
|
|
|
page = alloc_pages_node(node, gfp_mask, order);
|
|
if (page)
|
|
return page_address(page);
|
|
|
|
if (!warned) {
|
|
warn_alloc(gfp_mask & ~__GFP_NOWARN, NULL,
|
|
"vmemmap alloc failure: order:%u", order);
|
|
warned = true;
|
|
}
|
|
return NULL;
|
|
} else
|
|
return __earlyonly_bootmem_alloc(node, size, size,
|
|
__pa(MAX_DMA_ADDRESS));
|
|
}
|
|
|
|
/* need to make sure size is all the same during early stage */
|
|
void * __meminit vmemmap_alloc_block_buf(unsigned long size, int node)
|
|
{
|
|
void *ptr = sparse_buffer_alloc(size);
|
|
|
|
if (!ptr)
|
|
ptr = vmemmap_alloc_block(size, node);
|
|
return ptr;
|
|
}
|
|
|
|
static unsigned long __meminit vmem_altmap_next_pfn(struct vmem_altmap *altmap)
|
|
{
|
|
return altmap->base_pfn + altmap->reserve + altmap->alloc
|
|
+ altmap->align;
|
|
}
|
|
|
|
static unsigned long __meminit vmem_altmap_nr_free(struct vmem_altmap *altmap)
|
|
{
|
|
unsigned long allocated = altmap->alloc + altmap->align;
|
|
|
|
if (altmap->free > allocated)
|
|
return altmap->free - allocated;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* altmap_alloc_block_buf - allocate pages from the device page map
|
|
* @altmap: device page map
|
|
* @size: size (in bytes) of the allocation
|
|
*
|
|
* Allocations are aligned to the size of the request.
|
|
*/
|
|
void * __meminit altmap_alloc_block_buf(unsigned long size,
|
|
struct vmem_altmap *altmap)
|
|
{
|
|
unsigned long pfn, nr_pfns, nr_align;
|
|
|
|
if (size & ~PAGE_MASK) {
|
|
pr_warn_once("%s: allocations must be multiple of PAGE_SIZE (%ld)\n",
|
|
__func__, size);
|
|
return NULL;
|
|
}
|
|
|
|
pfn = vmem_altmap_next_pfn(altmap);
|
|
nr_pfns = size >> PAGE_SHIFT;
|
|
nr_align = 1UL << find_first_bit(&nr_pfns, BITS_PER_LONG);
|
|
nr_align = ALIGN(pfn, nr_align) - pfn;
|
|
if (nr_pfns + nr_align > vmem_altmap_nr_free(altmap))
|
|
return NULL;
|
|
|
|
altmap->alloc += nr_pfns;
|
|
altmap->align += nr_align;
|
|
pfn += nr_align;
|
|
|
|
pr_debug("%s: pfn: %#lx alloc: %ld align: %ld nr: %#lx\n",
|
|
__func__, pfn, altmap->alloc, altmap->align, nr_pfns);
|
|
return __va(__pfn_to_phys(pfn));
|
|
}
|
|
|
|
void __meminit vmemmap_verify(pte_t *pte, int node,
|
|
unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long pfn = pte_pfn(*pte);
|
|
int actual_node = early_pfn_to_nid(pfn);
|
|
|
|
if (node_distance(actual_node, node) > LOCAL_DISTANCE)
|
|
pr_warn("[%lx-%lx] potential offnode page_structs\n",
|
|
start, end - 1);
|
|
}
|
|
|
|
pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node)
|
|
{
|
|
pte_t *pte = pte_offset_kernel(pmd, addr);
|
|
if (pte_none(*pte)) {
|
|
pte_t entry;
|
|
void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node);
|
|
if (!p)
|
|
return NULL;
|
|
entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);
|
|
set_pte_at(&init_mm, addr, pte, entry);
|
|
}
|
|
return pte;
|
|
}
|
|
|
|
static void * __meminit vmemmap_alloc_block_zero(unsigned long size, int node)
|
|
{
|
|
void *p = vmemmap_alloc_block(size, node);
|
|
|
|
if (!p)
|
|
return NULL;
|
|
memset(p, 0, size);
|
|
|
|
return p;
|
|
}
|
|
|
|
pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node)
|
|
{
|
|
pmd_t *pmd = pmd_offset(pud, addr);
|
|
if (pmd_none(*pmd)) {
|
|
void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
|
|
if (!p)
|
|
return NULL;
|
|
pmd_populate_kernel(&init_mm, pmd, p);
|
|
}
|
|
return pmd;
|
|
}
|
|
|
|
pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node)
|
|
{
|
|
pud_t *pud = pud_offset(p4d, addr);
|
|
if (pud_none(*pud)) {
|
|
void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
|
|
if (!p)
|
|
return NULL;
|
|
pud_populate(&init_mm, pud, p);
|
|
}
|
|
return pud;
|
|
}
|
|
|
|
p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node)
|
|
{
|
|
p4d_t *p4d = p4d_offset(pgd, addr);
|
|
if (p4d_none(*p4d)) {
|
|
void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
|
|
if (!p)
|
|
return NULL;
|
|
p4d_populate(&init_mm, p4d, p);
|
|
}
|
|
return p4d;
|
|
}
|
|
|
|
pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node)
|
|
{
|
|
pgd_t *pgd = pgd_offset_k(addr);
|
|
if (pgd_none(*pgd)) {
|
|
void *p = vmemmap_alloc_block_zero(PAGE_SIZE, node);
|
|
if (!p)
|
|
return NULL;
|
|
pgd_populate(&init_mm, pgd, p);
|
|
}
|
|
return pgd;
|
|
}
|
|
|
|
int __meminit vmemmap_populate_basepages(unsigned long start,
|
|
unsigned long end, int node)
|
|
{
|
|
unsigned long addr = start;
|
|
pgd_t *pgd;
|
|
p4d_t *p4d;
|
|
pud_t *pud;
|
|
pmd_t *pmd;
|
|
pte_t *pte;
|
|
|
|
for (; addr < end; addr += PAGE_SIZE) {
|
|
pgd = vmemmap_pgd_populate(addr, node);
|
|
if (!pgd)
|
|
return -ENOMEM;
|
|
p4d = vmemmap_p4d_populate(pgd, addr, node);
|
|
if (!p4d)
|
|
return -ENOMEM;
|
|
pud = vmemmap_pud_populate(p4d, addr, node);
|
|
if (!pud)
|
|
return -ENOMEM;
|
|
pmd = vmemmap_pmd_populate(pud, addr, node);
|
|
if (!pmd)
|
|
return -ENOMEM;
|
|
pte = vmemmap_pte_populate(pmd, addr, node);
|
|
if (!pte)
|
|
return -ENOMEM;
|
|
vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct page * __meminit __populate_section_memmap(unsigned long pfn,
|
|
unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
|
|
{
|
|
unsigned long start;
|
|
unsigned long end;
|
|
|
|
/*
|
|
* The minimum granularity of memmap extensions is
|
|
* PAGES_PER_SUBSECTION as allocations are tracked in the
|
|
* 'subsection_map' bitmap of the section.
|
|
*/
|
|
end = ALIGN(pfn + nr_pages, PAGES_PER_SUBSECTION);
|
|
pfn &= PAGE_SUBSECTION_MASK;
|
|
nr_pages = end - pfn;
|
|
|
|
start = (unsigned long) pfn_to_page(pfn);
|
|
end = start + nr_pages * sizeof(struct page);
|
|
|
|
if (vmemmap_populate(start, end, nid, altmap))
|
|
return NULL;
|
|
|
|
return pfn_to_page(pfn);
|
|
}
|