unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

mm/sparsemem: enable vmem_altmap support in vmemmap_alloc_block_buf()

Browse source 
There are many instances where vmemap allocation is often switched between
regular memory and device memory just based on whether altmap is available
or not.  vmemmap_alloc_block_buf() is used in various platforms to
allocate vmemmap mappings.  Lets also enable it to handle altmap based
device memory allocation along with existing regular memory allocations.
This will help in avoiding the altmap based allocation switch in many
places.  To summarize there are two different methods to call
vmemmap_alloc_block_buf().

vmemmap_alloc_block_buf(size, node, NULL)   /* Allocate from system RAM */
vmemmap_alloc_block_buf(size, node, altmap) /* Allocate from altmap */

This converts altmap_alloc_block_buf() into a static function, drops it's
entry from the header and updates Documentation/vm/memory-model.rst.

Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Jia He <justin.he@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Will Deacon <will@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Steve Capper <steve.capper@arm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Yu Zhao <yuzhao@google.com>
Link: http://lkml.kernel.org/r/1594004178-8861-3-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2020-08-06 23:23:24 -07:00 committed by Linus Torvalds
parent 1d9cfee753
commit 56993b4e14
6 changed files with 22 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
Documentation/vm/memory-model.rst
View file

@ -178,7 +178,7 @@ for persistent memory devices in pre-allocated storage on those
devices. This storage is represented with :c:type:`struct vmem_altmap`
that is eventually passed to vmemmap_populate() through a long chain
of function calls. The vmemmap_populate() implementation may use the
`vmem_altmap` along with :c:func:`altmap_alloc_block_buf` helper to
`vmem_altmap` along with :c:func:`vmemmap_alloc_block_buf` helper to
allocate memory map on the persistent memory device.
ZONE_DEVICE

2
arch/arm64/mm/mmu.c
View file

@ -1102,7 +1102,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
if (pmd_none(READ_ONCE(*pmdp))) {
void *p = NULL;
p = vmemmap_alloc_block_buf(PMD_SIZE, node);
p = vmemmap_alloc_block_buf(PMD_SIZE, node, NULL);
if (!p)
return -ENOMEM;

4
arch/powerpc/mm/init_64.c
View file

@ -225,12 +225,12 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
* fall back to system memory if the altmap allocation fail.
*/
if (altmap && !altmap_cross_boundary(altmap, start, page_size)) {
p = altmap_alloc_block_buf(page_size, altmap);
p = vmemmap_alloc_block_buf(page_size, node, altmap);
if (!p)
pr_debug("altmap block allocation failed, falling back to system memory");
}
if (!p)
p = vmemmap_alloc_block_buf(page_size, node);
p = vmemmap_alloc_block_buf(page_size, node, NULL);
if (!p)
return -ENOMEM;

5
arch/x86/mm/init_64.c
View file

@ -1515,10 +1515,7 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start,
if (pmd_none(*pmd)) {
void *p;
if (altmap)
p = altmap_alloc_block_buf(PMD_SIZE, altmap);
else
p = vmemmap_alloc_block_buf(PMD_SIZE, node);
p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
if (p) {
pte_t entry;

4
include/linux/mm.h
View file

@ -2982,8 +2982,8 @@ pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node,
struct vmem_altmap *altmap);
void *vmemmap_alloc_block(unsigned long size, int node);
struct vmem_altmap;
void *vmemmap_alloc_block_buf(unsigned long size, int node);
void *altmap_alloc_block_buf(unsigned long size, struct vmem_altmap *altmap);
void *vmemmap_alloc_block_buf(unsigned long size, int node,
struct vmem_altmap *altmap);
void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
int vmemmap_populate_basepages(unsigned long start, unsigned long end,
int node, struct vmem_altmap *altmap);

32
mm/sparse-vmemmap.c
View file

@ -69,11 +69,19 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node)
__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);
static void * __meminit altmap_alloc_block_buf(unsigned long size,
struct vmem_altmap *altmap);
/* need to make sure size is all the same during early stage */
void * __meminit vmemmap_alloc_block_buf(unsigned long size, int node,
struct vmem_altmap *altmap)
{
void *ptr;
if (altmap)
return altmap_alloc_block_buf(size, altmap);
ptr = sparse_buffer_alloc(size);
if (!ptr)
ptr = vmemmap_alloc_block(size, node);
return ptr;
@ -94,15 +102,8 @@ static unsigned long __meminit vmem_altmap_nr_free(struct vmem_altmap *altmap)
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)
static void * __meminit altmap_alloc_block_buf(unsigned long size,
struct vmem_altmap *altmap)
{
unsigned long pfn, nr_pfns, nr_align;
@ -147,10 +148,7 @@ pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node,
pte_t entry;
void *p;
if (altmap)
p = altmap_alloc_block_buf(PAGE_SIZE, altmap);
else
p = vmemmap_alloc_block_buf(PAGE_SIZE, node);
p = vmemmap_alloc_block_buf(PAGE_SIZE, node, altmap);
if (!p)
return NULL;
entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);