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mm: percpu: add generic pcpu_populate_pte() function 

With NEED_PER_CPU_PAGE_FIRST_CHUNK enabled, we need a function to
populate pte, this patch adds a generic pcpu populate pte function,
pcpu_populate_pte(), which is marked __weak and used on most
architectures, but it is overridden on x86, which has its own
implementation.

Link: https://lkml.kernel.org/r/20211216112359.103822-5-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2022-01-19 18:07:53 -08:00 committed by Linus Torvalds
parent 23f917169e
commit 20c0357646
6 changed files with 78 additions and 162 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
arch/powerpc/kernel/setup_64.c
View File

@ -787,51 +787,6 @@ static __init int pcpu_cpu_to_node(int cpu)
unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(__per_cpu_offset);
static void __init pcpu_populate_pte(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
p4d = p4d_offset(pgd, addr);
if (p4d_none(*p4d)) {
pud_t *new;
new = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE);
if (!new)
goto err_alloc;
p4d_populate(&init_mm, p4d, new);
}
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd_t *new;
new = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE);
if (!new)
goto err_alloc;
pud_populate(&init_mm, pud, new);
}
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd)) {
pte_t *new;
new = memblock_alloc(PTE_TABLE_SIZE, PTE_TABLE_SIZE);
if (!new)
goto err_alloc;
pmd_populate_kernel(&init_mm, pmd, new);
}
return;
err_alloc:
panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
}
void __init setup_per_cpu_areas(void)
{
const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE;
@ -860,7 +815,7 @@ void __init setup_per_cpu_areas(void)
}
if (rc < 0)
rc = pcpu_page_first_chunk(0, pcpu_cpu_to_node, pcpu_populate_pte);
rc = pcpu_page_first_chunk(0, pcpu_cpu_to_node);
if (rc < 0)
panic("cannot initialize percpu area (err=%d)", rc);

56
arch/sparc/kernel/smp_64.c
View File

@ -1539,59 +1539,6 @@ static int __init pcpu_cpu_to_node(int cpu)
return cpu_to_node(cpu);
}
static void __init pcpu_populate_pte(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
if (pgd_none(*pgd)) {
pud_t *new;
new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
pgd_populate(&init_mm, pgd, new);
}
p4d = p4d_offset(pgd, addr);
if (p4d_none(*p4d)) {
pud_t *new;
new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
p4d_populate(&init_mm, p4d, new);
}
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd_t *new;
new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
pud_populate(&init_mm, pud, new);
}
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd)) {
pte_t *new;
new = memblock_alloc_from(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
pmd_populate_kernel(&init_mm, pmd, new);
}
return;
err_alloc:
panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
}
void __init setup_per_cpu_areas(void)
{
unsigned long delta;
@ -1610,8 +1557,7 @@ void __init setup_per_cpu_areas(void)
}
if (rc < 0)
rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
pcpu_cpu_to_node,
pcpu_populate_pte);
pcpu_cpu_to_node);
if (rc < 0)
panic("cannot initialize percpu area (err=%d)", rc);

5
arch/x86/kernel/setup_percpu.c
View File

@ -101,7 +101,7 @@ static int __init pcpu_cpu_to_node(int cpu)
return early_cpu_to_node(cpu);
}
static void __init pcpup_populate_pte(unsigned long addr)
void __init pcpu_populate_pte(unsigned long addr)
{
populate_extra_pte(addr);
}
@ -163,8 +163,7 @@ void __init setup_per_cpu_areas(void)
}
if (rc < 0)
rc = pcpu_page_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
pcpu_cpu_to_node,
pcpup_populate_pte);
pcpu_cpu_to_node);
if (rc < 0)
panic("cannot initialize percpu area (err=%d)", rc);

51
drivers/base/arch_numa.c
View File

@ -14,7 +14,6 @@
#include <linux/of.h>
#include <asm/sections.h>
#include <asm/pgalloc.h>
struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
EXPORT_SYMBOL(node_data);
@ -155,52 +154,6 @@ static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
return node_distance(early_cpu_to_node(from), early_cpu_to_node(to));
}
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
static void __init pcpu_populate_pte(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
p4d = p4d_offset(pgd, addr);
if (p4d_none(*p4d)) {
pud_t *new;
new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
p4d_populate(&init_mm, p4d, new);
}
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd_t *new;
new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
pud_populate(&init_mm, pud, new);
}
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd)) {
pte_t *new;
new = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!new)
goto err_alloc;
pmd_populate_kernel(&init_mm, pmd, new);
}
return;
err_alloc:
panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
}
#endif
void __init setup_per_cpu_areas(void)
{
unsigned long delta;
@ -225,9 +178,7 @@ void __init setup_per_cpu_areas(void)
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
if (rc < 0)
rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
early_cpu_to_node,
pcpu_populate_pte);
rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, early_cpu_to_node);
#endif
if (rc < 0)
panic("Failed to initialize percpu areas (err=%d).", rc);

5
include/linux/percpu.h
View File

@ -95,7 +95,6 @@ extern const char * const pcpu_fc_names[PCPU_FC_NR];
extern enum pcpu_fc pcpu_chosen_fc;
typedef int (pcpu_fc_cpu_to_node_fn_t)(int cpu);
typedef void (*pcpu_fc_populate_pte_fn_t)(unsigned long addr);
typedef int (pcpu_fc_cpu_distance_fn_t)(unsigned int from, unsigned int to);
extern struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
@ -113,9 +112,9 @@ extern int __init pcpu_embed_first_chunk(size_t reserved_size, size_t dyn_size,
#endif
#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK
void __init pcpu_populate_pte(unsigned long addr);
extern int __init pcpu_page_first_chunk(size_t reserved_size,
pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn,
pcpu_fc_populate_pte_fn_t populate_pte_fn);
pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn);
#endif
extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align) __alloc_size(1);

76
mm/percpu.c
View File

@ -3174,11 +3174,79 @@ out_free:
#endif /* BUILD_EMBED_FIRST_CHUNK */
#ifdef BUILD_PAGE_FIRST_CHUNK
#include <asm/pgalloc.h>
#ifndef P4D_TABLE_SIZE
#define P4D_TABLE_SIZE PAGE_SIZE
#endif
#ifndef PUD_TABLE_SIZE
#define PUD_TABLE_SIZE PAGE_SIZE
#endif
#ifndef PMD_TABLE_SIZE
#define PMD_TABLE_SIZE PAGE_SIZE
#endif
#ifndef PTE_TABLE_SIZE
#define PTE_TABLE_SIZE PAGE_SIZE
#endif
void __init __weak pcpu_populate_pte(unsigned long addr)
{
pgd_t *pgd = pgd_offset_k(addr);
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
if (pgd_none(*pgd)) {
p4d_t *new;
new = memblock_alloc(P4D_TABLE_SIZE, P4D_TABLE_SIZE);
if (!new)
goto err_alloc;
pgd_populate(&init_mm, pgd, new);
}
p4d = p4d_offset(pgd, addr);
if (p4d_none(*p4d)) {
pud_t *new;
new = memblock_alloc(PUD_TABLE_SIZE, PUD_TABLE_SIZE);
if (!new)
goto err_alloc;
p4d_populate(&init_mm, p4d, new);
}
pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
pmd_t *new;
new = memblock_alloc(PMD_TABLE_SIZE, PMD_TABLE_SIZE);
if (!new)
goto err_alloc;
pud_populate(&init_mm, pud, new);
}
pmd = pmd_offset(pud, addr);
if (!pmd_present(*pmd)) {
pte_t *new;
new = memblock_alloc(PTE_TABLE_SIZE, PTE_TABLE_SIZE);
if (!new)
goto err_alloc;
pmd_populate_kernel(&init_mm, pmd, new);
}
return;
err_alloc:
panic("%s: Failed to allocate memory\n", __func__);
}
/**
* pcpu_page_first_chunk - map the first chunk using PAGE_SIZE pages
* @reserved_size: the size of reserved percpu area in bytes
* @cpu_to_nd_fn: callback to convert cpu to it's node, optional
* @populate_pte_fn: function to populate pte
*
* This is a helper to ease setting up page-remapped first percpu
* chunk and can be called where pcpu_setup_first_chunk() is expected.
@ -3189,9 +3257,7 @@ out_free:
* RETURNS:
* 0 on success, -errno on failure.
*/
int __init pcpu_page_first_chunk(size_t reserved_size,
pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn,
pcpu_fc_populate_pte_fn_t populate_pte_fn)
int __init pcpu_page_first_chunk(size_t reserved_size, pcpu_fc_cpu_to_node_fn_t cpu_to_nd_fn)
{
static struct vm_struct vm;
struct pcpu_alloc_info *ai;
@ -3255,7 +3321,7 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
(unsigned long)vm.addr + unit * ai->unit_size;
for (i = 0; i < unit_pages; i++)
populate_pte_fn(unit_addr + (i << PAGE_SHIFT));
pcpu_populate_pte(unit_addr + (i << PAGE_SHIFT));
/* pte already populated, the following shouldn't fail */
rc = __pcpu_map_pages(unit_addr, &pages[unit * unit_pages],